JPH03225657A - Reel base driving mechanism for tape player - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The reel stand drive mechanism of the tape player of the present invention will be described in detail according to the following items.

A. Industrial field of application B8 Summary of the invention C1 Prior art [Fig. 21] a. - Background for boat fishing An example of a conventional reel stand drive mechanism [Fig. 21 [Figure 21] Means F for solving E6 problem, Example [Figures 1 to 20] a, Capstan, Reel stand [Figures 1, 2, 4, 8 to 14] Figures, Figures 18 to 20] b. Drive system [Figure 1, Figure 2, Figure 4, Figure 5, Figure 9, Figure 15, Figure 17] C. Head base [Figure 1 Figure, Figure 3, Figure 7, Figure 8,
Fig. 10, Fig. 11, Fig. 14, Fig. 16] d. Lock lever, stop lever [Fig. 1, Fig. 2,
Fig. 4, Fig. 8, Fig. 10 to Fig. 13, Fig. 16, Fig. 20] e. Pinch roller pressure bonding mechanism [Fig. 1, Fig. 3, Fig. 7,
Fig. 8, Fig. 10, Fig. 11, Fig. 14, Fig. 16] e-! , pinch roller lever [Fig. 1, Fig. 3, Fig. 7, Fig. 8, Fig. 10, Fig. 11, Fig. 14, Fig. 16] e-2, toggle spring, switching lever [Fig. 1, Fig. 3, Fig. 7, Fig. 8, Fig. 10, Fig. 11, Fig. 14] e-3, Pinch roller crimping and its release [Fig. 10,
Fig. 11, Fig. 14, e-4, Tape running, crimping switching [Fig. 10, Fig. 11]
Figure f, Direction lever [Figure 1, Figure 2, Figure 4,
8, 10 to 14, 16, 18 to 20] g, fast forward lever, rewind lever [Fig. 1, 2, 4, 8, Fig. 12, Fig. 13, Fig. 15 h, Reel stand drive mechanism [Fig. 1, Fig. 2, Fig. 4, Fig. 6]
Figures 8 to 13, 15, 17 to 1
Figure 9] h-1, Swing lever [Figures 1, 2, 4, 6, 8 to 13, 15, 18, and 19 h-2 , Gear ratio switching gear [Figures 1, 2, 4, 6, 8 to 13, 15, 17 to 19 h-2-a, structure h -2-b, Rotation of reel stand, gear ratio switching h-3 Movement of rocking lever [Figures 1, 10, 11] 1. Formation of mode [Figures 10 to 13, Fig. 15 Koi-1, Play mode [Fig. 10, Fig. 11 Koi-2, High-speed running mode [Fig. 12, Fig. 13, Fig. 15]
] j, Auto-reverse mechanism [Fig. 1, Fig. 2, Fig. 4, Fig. 6, Fig. 8 to 11, Fig. 16 to 20] j-t Rotating lever [Fig. 1 , Fig. 2, Fig. 4, Fig. 1
0, FIG. 11, FIGS. 16 to 20] j-2, tape end detection means [FIGS. 1 to 11, FIGS. 16 to 19] j-2-a, structure j- 2-b, Effect J-3, Automatic switching of tape running direction [Fig. 18, 19
Figure j-3-a, Switching from normal play mode to reverse play mode [Figure 18] j-3-b, Switching from reverse play mode to normal play mode [Figure 19] k, Shut-off [Figure 18] Figure 1, Figure 2, Figure 4, Figure 20] Effects of G1 invention (A, industrial application field), 1. Regarding the meter mechanism. Specifically, by devising a gear mechanism to transmit the rotation of the drive system to the input gear for the reel stand, it is now possible to selectively switch the rotation speed of the reel stand by simply changing the position of one gear. The present invention aims to provide a novel reel stand drive mechanism for a tape player.

(B. Summary of the Invention) The reel stand drive lII mechanism of the tape player of the present invention has a structure in which the drive gear forming the output stage of the drive system has two large and small gears, and the drive gear and the input gear for the reel stand are connected to each other. A gear ratio switching gear that has two large and small gears and is freely displaceable in the axial direction is installed, and when forming a play mode in which the reel stand is rotated at low speed, the gear ratio switching gear is set so that the large gear is the small drive gear. When the high speed driving mode is established, the gear ratio switching gear is moved to a position where the small gear meshes with the large gear of the drive gear.
As a result, the rotational speed of the reel stand can be selectively switched simply by changing the position of the gear ratio switching gear in the axial direction, and the number of parts and assembly man-hours can be significantly reduced, as well as the reel stand drive mechanism. This makes it possible to downsize the device.

(C, Prior Art) [Figure 21] (a, - Boat Fishing Background) A tape player has two reel stands in which two tape reels are engaged separately, and a A reel stand drive mechanism including a gear or the like is provided for rotating either one of the two reel stands in a direction in which the tape is wound onto the tape reel (hereinafter referred to as the "tape winding direction").

In the play mode where recording and playback are performed on the tape, the tape is run at a relatively slow speed by a capstan that rotates at a constant speed and a pinch roller that presses the tape between the capstan. In the play mode, the reel stand is rotated at a relatively low speed in the tape winding direction, and the tape is run at high speed, such as in a fast forward mode for fast forwarding the tape or in a rewind mode for rewinding the tape. When forming the high-speed running mode, the reel stand is rotated in the tape winding direction at a speed several times or more than the running speed in the play mode.

Incidentally, many of today's tape players are equipped with a so-called reverse function, and tape players equipped with this function have two types of play modes. That is, the direction in which the tape is in the - direction C or below is called the "normal direction." ) and a reverse play mode that performs recording and reproduction while the tape is traveling in the reverse direction opposite to the normal direction.

Therefore, the reel stand that winds the tape when the tape runs in the normal direction (hereinafter referred to as the "N side reel stand") is at low speed in play mode, and at high speed in high speed running mode. ;i 11- shi body
Ten and two-seven! 11 1g -1+direction 8 -wobble; The reel stand that winds the tape (hereinafter referred to as the "N side reel stand") rotates at low speed in play mode and at high speed in high speed running mode. Ru.

Therefore, the reel stand drive mechanism of the tape player is configured to be able to rotate either one of the two reel stands in the tape winding direction at a required rotational speed according to each mode.

(b. An example of a conventional reel stand driving mechanism) [Fig. 21] Fig. 21 shows an example a of a conventional reel stand driving mechanism.

In the figure, b is an N-side reel stand, and b' is an N-side reel stand, each having gear parts c and c'. d is a direction conversion gear that meshes with the gear part C of the N side reel stand, and e is a transmission gear that meshes with the gear part C' of the R side reel stand via the intermediate gear f. . g is rotatably supported by the support @h (Fig. 21), ) - ``In the deceased! i is the first swing lever, j
is the second swinging lever, and these swinging levers i and j
are both supported so as to be able to rotate around the support shaft, and have two large and small gears k and 1 at the rear rotating end of the first swing lever i. A drive gear m is rotatably supported, and its large gear k is meshed with a drive gear g, and a fast forward mode gear n and a rewind mode gear O are provided at both left and right ends of the second swing lever J. These gears n and o are each rotatably supported and meshed with a drive gear g. The small gear l of the play mode gear m is located between the direction change gear d and the transmission gear e, and the fast forward mode gear n is located in the gear section C of the N side reel stand, and also in the rewind motor. The transmission gear 0 faces the transmission gear e from the front.

In the stop motor, both the first swing lever i and the second swing lever j are held at the intermediate positions shown in the drawings, and in this state, the small gear position of the play motor gear m is in the gear position. The fast forward mode gear n is held in a position where it does not mesh with either the section C or the transmission gear e.
is the gear part c1 of the reel stand. : The rewind mode gear 0 is held in a position where it does not mesh with the transmission gear e.

Therefore, when the normal play mode is established, the drive gear g rotates clockwise (hereinafter referred to as "normal rotation").

), the first swinging lever i is rotated clockwise, and the small gear k of the play mode gear m is engaged with the direction changing gear d, thereby causing the N side reel stand to rotate counterclockwise. direction, that is, the tape winding direction. Also,
When a reverse play mode is formed, the drive gear g is rotated forward and the first swing lever i is rotated counterclockwise so that the small gear of the play mode gear m meshes with the transmission gear e. As a result, the R-side thread holder' is rotated clockwise, that is, in the tape winding direction. Furthermore,
When the fast forward mode is formed, the drive gear g is rotated counterclockwise, that is, reversed, and the second rocking lever j is rotated counterclockwise, so that the fast forward mode gear n is rotated. It meshes with the gear part C of the N side reel stand, thereby
When the side reel stand is rotated in the tape winding direction and a rewinding motor is formed, the drive gear g is rotated forward and the second
The swinging lever j is rotated clockwise, and the rewinding mode gear 0 is engaged with the transmission gear e, thereby rotating the R side slider 1' in the tape winding direction.

When the rotation of the drive gear g is transmitted to the reel stand b'' via the play mode gear m, the drive gear g
Due to the reduction ratio between the large gear and the large gear several times larger in diameter, between the small gear and the transmission gear e, or between the direction conversion gear d and the gear part C, the rotation of the drive gear g is considerably reduced. The speed is decelerated and transmitted to the reel stands b and b', whereby the reel stands b and b' are rotated at a low speed in the play mode, and
When the rotation of the drive gear g is transmitted to the reel stand b' via the fast forward mode gear n or the rewind mode gear 0,
The rotation of the drive gear g is only slowed down by the reduction ratio between the drive gear g and the fast-forward motor gear n or the rewind motor gear O, which has a slightly larger diameter, and is transmitted to the reel stand b'. Therefore, in high-speed running mode, reel stand b
1b' is rotated at a speed considerably faster than the rotation speed in play mode.

The positions of the swing levers i and j are controlled by, for example, a cam gear (not shown) for mode formation.

(D. Problem to be Solved by the Invention) [Figure 21] In the above-described conventional reel stand drive mechanism a, the gear that transmits the rotation of the drive system to the reel stand b' is used for play mode. By separately and independently providing gear m, gear n for fast forward mode, and gear 0 for rewind mode, and changing the gear ratio between these gears m, n, 0 and drive gear g, reel stand b% The rotational speed of b' is selected. For this reason, there are a large number of gears, and multiple levers are also required to selectively engage the gears with the reel stand, so the number of parts and these gears m, n, 0, levers i, j, etc. The number of man-hours required to incorporate the
Therefore, there is a problem in that the cost is high and, furthermore, a considerably large space must be prepared in order to arrange the large number of gears, resulting in a large size.

(E. Means for Solving the Problems) Therefore, the reel stand drive mechanism of the tape player of the present invention is as follows:
In order to solve the above problems, we have developed an input gear that transmits the rotation of the drive system to the reel stand, a drive gear that has two large and small gears located on the same axis, and a drive gear that has two large and small gears that are located on the same axis. a first position where either one of the two gears meshes with the input gear and the large gear meshes with the small gear of the drive gear; and a second position where the small gear meshes with the large gear of the drive gear. When forming a play mode, The gear ratio switching gear is moved to the first position, and when a high speed running mode in which the tape is run at high speed is established, the gear ratio switching gear is moved to the second position.

Therefore, in the reel stand drive mechanism of the tape player of the present invention, when the play mode is formed, the rotation of the drive gear is decelerated by the large gear of the gear ratio switching gear meshing with the small gear of the drive gear. When the high-speed running mode is established, the small gear of the gear ratio switching gear meshes with the large gear of the drive gear, increasing the rotation speed of the drive gear and transmitting it to the reel stand. Therefore, gear ratio switching gear 1
The rotation speed of the reel stand can be selectively switched by simply changing the position of the reel. This allows only one gear to transmit the rotation of the drive system to the reel stand by selectively changing the gear ratio. The number of parts sold and the number of assembly steps can be significantly reduced, and the overall size can be reduced.

(F. Embodiment) [FIGS. 1 to 20] Details of the reel stand drive mechanism of the tape player of the present invention will be explained according to the illustrated embodiment.

(a, capstan, reel stand) [Fig. 1, Fig. 2, Fig. 4, Fig. 8 to 14, Fig. 18 to 20. ).

Reference numeral 2 denotes a mechanical chassis made of synthetic resin, and the mechanical chassis 2 includes a support shaft, a pedestal, a holding part, or a 8-movement direction guide for supporting various rotating members, rotating members, sliding members, etc., which will be described later. The shaft, etc. are integrally formed. It should be noted that only some of the support shafts and the like are shown in the drawings.

3.3 is a support sleeve, which is attached to the front end of the mechanical chassis 2 (
In FIG. 1, the downward direction is defined as the front, and the upward direction is defined as the backward direction. In addition, the direction toward the left in the figure is defined as the left, and the direction toward the right is defined as the right. In the following description, the orientation will be indicated as follows. .3, the intermediate portion of the capstan 4.4' is rotatably supported.

Reference numeral 5.5' denotes a reel stand, which is rotatably supported by a support shaft 6.6 projecting upward from both left and right ends of the rear end of the mechanical chassis 2, and a reel stand gear 7.7' forming the lower end thereof. A reel engaging shaft 8.8' protruding from the center of the reel stand gear 7.7' is formed on the body, and the left reel stand 5' (hereinafter referred to as rR side reel stand). The reel stand gear 7' is located at a slightly lower position than the reel stand gear 7 of the right reel stand 5 (hereinafter referred to as the "rN side reel stand"), and is formed thicker than the reel stand gear 7.

Reference numeral 9 denotes a direction conversion gear rotatably supported by the mechanical chassis 2, which has a relatively small diameter and is thick, and its upper end is N.
It is meshed with the gear 7 of the side reel stand 5 from the left rear.

(b Drive system) [Figure 1, Figure 2, Figure 4, Figure 5, Figure 9, Figure 15, Figure 17. 11 is fixed.

12 and 12' are flyholes, and a heald winding groove is formed on the outer peripheral surface of the flyhole, and the lower end of the capstan 4.4' is fixed to the center of the flyhole. A small-diameter gear portion 12a is integrally formed in the center of the.

Reference numeral 13 denotes an endless belt, and the frame is passed between the drive pulley 11 and the flywheel 12.12', so that when the motor 10 rotates, the flywheel 12.12' is rotated together with the capstan 4.4'. .

The heald 13 is mounted on a frame so that the flywheels 12 and 12' rotate in opposite directions, and the motor 10 rotates the flywheel 12 on the right in a counterclockwise direction when viewed from above. rotated to

When the motor 10 rotates, the right capstan 4 (hereinafter referred to as "N side capstan") moves counterclockwise when viewed from above, and the left capstan 4' (
Hereinafter, this will be referred to as the "R side gear stan." ) are rotated clockwise when viewed from above.

Reference numeral 14 denotes a cam gear for rotating a gear ratio switching gear, which will be described later, and is composed of two large and small gears. 15 is a large gear, and the dog gear 15 is integrally formed with a cylindrical boss 16 passing through its center in the axial direction, and the upper end 16a of the boss 16 is formed to have a larger diameter than the rest of the gear. has been done.

Reference numeral 17 denotes a relatively thick small gear, which has a diameter approximately half the diameter of the large gear 15, and has an insertion hole 17a in its center and a recess 17b in its upper surface.
The upper half of the boss 16 of the large gear 15 is rotatably inserted through 7a. A friction plate 18 made of a material with a high coefficient of friction, such as felt, is inserted between the upper surface of the large gear 15 and the lower surface of the small gear 17, and a recess 17b of the small gear 17 is inserted.
A coil spring 19 is compressed between the inner bottom surface of the boss 16 and the lower surface of the upper end 16a of the boss 16, so that the large gear 15, the small gear 17, and the friction plate 18 are pressed against each other in the axial direction.

20 is Nff1ll 4 of the bottom surface of Nuka chassis 2
It is a support shaft vertically installed at a position f181!11 to the rear left from the Yabustan 4, and the lower part from its upper end 20a is inserted into the host 16 of the cam gear 14, so that the cam gear 14 or the mechanical chassis 2 It is rotatably supported on the lower surface side, and its large gear 15 is meshed with the gear portion 12a of the flywheel 12.

Therefore, when the motor 10 rotates, the large gear 15 is also rotated clockwise when viewed from above, and the small gear 17 is rotated together with the large gear 15 unless rotation is prevented.

Note that a required cam portion is formed on the lower surface of the large gear 15. This cam portion will be described later.

(C head \-s) [Fig. 1, Fig. 3, Fig. 7, Fig. 8
10, 11, 14, and 16] 21 is a head base that supports the magnetic head 22.

23 is the main part of the head base 21, which includes a front part 23a that is long in the left-right direction and a rear part 23 that projects rearward from the front part 23a.
b, and a push button mounting portion 23c protruding forward from approximately the middle portion in the left-right direction of the front portion 23a.
24. From the position near the left and right ends of the guide bin 24.
are erected, and head support bins 25, 25 are erected at the center in the left-right direction, spaced apart laterally, and a spring-loaded pin 26 is erected from the front end of the center portion of the upper surface of the push button mounting portion 23c. A spring arrangement hole 27 which is long in the front-rear direction is formed in the front part of the rear part 23b.

Reference numeral 28 denotes a head holder attached to the head support bin 25.25, and the magnetic head 22 is held in the head holder 28.

Reference numeral 29 has a push button, which is formed in a hollow shape opening toward the rear, and is bent over the push button mounting portion 23c so that the push button mounting portion 23c and the spring hook pin 26 are located in the hollow.

Reference numeral 30 denotes a lock pin that projects downward from approximately the center of the front portion 23a.

The head base 21 is supported on the upper surface of the mechanical chassis 2 so as to be movable within a certain range in the front-rear direction, and a spring abutment 31 (see FIG. 1) formed on the mechanical chassis 2 is supported by a spring. A coil spring 32 is located within the arrangement hole 27 and is compressed between the spring abutting portion 31 and the front end of the spring arrangement hole 27, and the elastic force of the coil spring 32 applies a forward moving force to the head base 21. is energized.

When the head base 21 is not pressed rearward, it is at the stop position shown in FIG. The magnetic tape 33 is held at a stop position that is slightly forward of the magnetic tape 33, and when a play mode for recording or reproducing is formed, the magnetic tape 33 is held at a play position shown in FIGS. The tape contact surface 22a of the head 22 is moved to a position where it contacts the magnetic tape 33.

(d, lock lever, stop lever) [Fig. 1,
2, FIG. 4, FIG. 8, FIGS. 10 to 13, FIG. 16, and FIG. This is to hold the rewind lever and the rewind lever in the pressed position.

The lock lever 34 has a plate shape that is long in the left and right direction,
It is supported on the lower surface of the front end of the mechanical chassis 2 so as to be movable in the left-right direction within a certain range, and is biased with a moving force to the right by an elastic means (not shown), and its right end surface 34a is moved rearward. The pressed surface is inclined so that it is displaced to the right according to the row.

35, 36 and 37 are holes formed in the lock lever 34 and are long in the approximately front-back direction, and are formed at approximately the center in the left-right direction after the lock lever 34 and at positions on both left and right sides thereof. A lock claw 38.38.38 is provided protruding from the left side surface of .37, and the lock claw 38.38.
The rear surfaces 38a, 38a, 38a of 38 are lock surfaces extending in the left-right direction, and the lock surfaces 38a, 38a, 3
Surfaces 38b, 38b following the right end of 8a.

The majority of 38b is a pressed surface that is inclined so as to be displaced to the left as it goes forward.

Reference numeral 39 is a stop lever that is operated when canceling an operation mode such as play mode and entering stop mode, and is supported at the right end of the lower surface of the front end of the mechanical chassis 2 so that it can slide freely within a certain range in the front and back direction. At the same time, a forward moving force is applied by an elastic means (not shown).

The left side surface of the stop lever 39 is bent into a crank shape, and the tin left embroidery part 39a facing in the middle 77) 2 serves as a pressing part, and the lock lever 34
is in the locked position, as shown in Figure 2.
The pressing portion 39a is the pressed surface 34a of the lock lever 34.
are closely opposed to the front end of the

A locked pin 30 formed in the head base 21 projects downward from the mechanical chassis 2 through a hole (not shown) formed in the mechanical chassis 2, and its lower end is connected to the lock lever.
Of the three holes 35, 36, 37 formed in 34, the central one 36 is located.

When the head base 21 is at the stop position, the locked pin 30 is pressed against the pressed surface 3 of the lock claw 38.
When the head base 21 moves rearward from this state, the locked pin 30 presses the pressed surface 38b and moves the lock lever 34 to the left, that is, in the unlocking direction. At the same time as the head base 21 reaches the play position, the locked pin 30 moves to 1.
By pressing the sleeve T side i A h A),
The lock lever 34 returns to the lock position due to the force of movement thereof, and the lock surface 38a of the lock claw 38 is located in front of the locked bin 30 (see FIGS. 10 and 11). Thereby, even if the pressing force on the head base 21 is released, the head base 21 is held at the play position.

Furthermore, when the stop lever 39 is pushed in while the head base 21 is held in the play position, the pressing portion 39a presses the pressed surface 34a of the lock lever 34 and moves the lock lever 34 in the unlocking direction. ,
The locking surface 38a escapes from the locked bin 30 to the left, and is thereby returned to the stop position by the elastic force of the head base 21 or the coil spring 32.

(e, pinch roller crimping mechanism) [Fig. 1, Fig. 3, Fig. 7
8, 10, 11, 14, and 16. Reference numeral 40 is a pinch roller pressure bonding mechanism, which includes the head base 21 and one pinch roller lever supported by the head base 21. and 2 supported by the pinch roller lever.
It consists of two pinch rollers, one toggle spring for click-locking the pitch roller lever and pressing the pinch roller against the capstan 4.4', and a switching lever for switching the position of the pinch roller lever.

(e-1, pinch roller lever) [Fig. 1, Fig. 3, Fig. 7, Fig. 8, Fig. 10, Fig. 11, Fig. 14, Fig. 16 Fig. 41 is the pinch roller 42.42' This is a pinch roller lever that supports the Reference numeral 43 designates the main part of the pinch roller lever 41, which is long in the left-right direction, and has a head arrangement recess 44 formed in the center of the rear side surface, which is approximately U-shaped and opens toward the front when viewed from above. A guided elongated hole 45.45 that is long in the left-right direction is formed between the recess 44 and both left and right ends, and the bottom of the left end is formed at a higher position than the bottom of the remaining part. An engagement groove 46 extending in the front-rear direction is formed on the bottom surface of the left end. Pinch roller arrangement recesses 47.47 each having a substantially semicircular horizontal cross section are located near the right and left ends of the rear surface of the main portion 43.
(See FIG. 1) are formed between the upper and lower walls of the pinch roller arrangement recesses 47, 47, and the support shafts 48.
48 is supported, and two pinch rollers 42.42' are rotatably supported on the support shaft 48.48.

Reference numeral 49 denotes a projecting piece that projects forward from the central lower end of the front side surface of the main portion 43, and a spring hook pin 49a is erected at the front end of the projecting piece 49.

Reference numeral 50 denotes a projecting piece that projects rearward from the lower end of the substantially central portion in the left-right direction of the rear side surface of the main portion 43, and a control hole 51 is formed in the projecting piece 50. The control hole 51 has a rear portion 51a (hereinafter referred to as a “non-restricted portion”) and a front portion 51b (hereinafter referred to as a “restricted portion”) in the left-right direction.
A side edge 51c is several times longer than the length in the left-right direction, and the regulating portion 51b is located at a location substantially corresponding to the center of the non-regulating portion 51a, and connecting both ends of the non-regulating portion 51a and the regulating portion 51b; 51d is a pressing edge inclined at approximately 45 degrees with respect to the front-rear direction.

The pinch roller lever 41 is placed on the upper surface of the front part 23a of the head base 21, and the guide bin 2 of the head base 21 is inserted into the guided elongated hole 45.45.
4.24 is slidably engaged and the head base 2
The state where it is placed on the front part 23a is maintained by a holding part (not shown) provided on the front part 23a.

Therefore, the pinch roller lever 41 moves in the left and right direction, that is,
The pinch rollers 42 and 4 are supported to be movable within a certain range in a direction perpendicular to the moving direction of the head base 21, and after the head base 21 is at the stop position, the pinch rollers 42, 4 are moved.
2' is spaced forward from the capstan 4.4', and when the pinch roller lever 41 reaches the left end position in its movement range, that is, the normal position shown in FIG. Below, "N side pinch roller"
Say. ) is opposed to the N-side capstan 4 from the front diagonally right side, and is at the right end position in the movement range, that is,
When the vehicle reaches the reverse position, the left pinch roller 42' (hereinafter referred to as "R side pinch roller") faces the R side gear stan 4' from the front and slightly diagonally left side.

Moreover, when the head base 21 moves, the pinch roller lever 41 is also moved in the front and back direction integrally with it.

Note that when the pinch roller lever 41 is supported by the head base 21, the protruding piece 49 on the front side is positioned close to the upper surface of the rear end of the push button mounting portion 23c of the head base 21, and the pinch roller lever 41 is supported by the head base 21. When the head is at an intermediate position in the movement range, the spring-loaded pin 49a is positioned directly opposite the spring-loaded pin 26 of the head base 21 from behind.

Further, the head holder 28 is attached to the pinch roller lever 4.
It is located in the head arrangement recess 44 of No. 1.

(e-2, toggle spring, switching lever) [Fig. 1, Fig. 3, Fig. 7, Fig. 8, Fig. 10, Fig. 11, Fig. 14] 52 is a toggle spring in the shape of an iron spring. , the tip of one arm 52a extending from the coil portion is engaged with a spring pin 49a of the pinch roller lever 41, and the other arm 52
The tip of b is engaged with a spring hook 26 of the head base 21.

Therefore, when the pinch roller lever 41 is at an intermediate position in its movement range, the tips of the two arms 52a and 52b of the toggle spring 52 are aligned in the front-rear direction. Since the direction of the force that presses the spring-loaded pin 49a is directly backward, no horizontal movement force is applied to the pinch roller lever 41, but the pinch roller lever 41 is moved to the left from the intermediate position. When the toggle spring 52 comes, the spring-loaded pin 4
Since the direction of the force pressing 9a includes a leftward component, the pinch roller lever 41 is urged to move toward the normal position, and when the pinch roller lever 41 comes to the right of the intermediate position, the toggle spring is activated. Since the direction of the force with which 52 presses the spring-loaded pin 49a includes a rightward component, a force is applied to the pinch roller lever 41 to move it toward the reverse position.

Accordingly, the elastic force of the toggle spring 52 causes the pinch roller lever 41 to be click-locked in the normal position and reverse position.

53 is a switching lever for selectively moving the pinch roller lever 41 to the normal position or reverse position by manual operation, and includes a boss portion 53a, an arm 53b extending substantially rearward from the boss portion 53a, and the arm 53b. A press bottle 53c erected at the tip of the pusher 53c and a knob 53d extending substantially forward from the boss 53a are integrally formed.
The boss portion 53a is rotatably supported at a position near the left end of the front end of the upper surface of the mechanical chassis 2, and the upper part of the press pin 53c is slidably engaged with the engagement groove 46 formed in the pinch roller lever 41. has been done.

Therefore, when the switching lever 53 is rotated clockwise when viewed from above from the state where the pinch roller lever 41 is in the normal position, the pressing pin 53c moves approximately to the right side of the engagement groove 46 of the pinch roller lever 41. The pinch roller lever 41 is moved to the reverse position, and when the switching lever 53 is rotated counterclockwise from the state where the pinch roller lever 41 is in the reverse position, the pressing pin 53c is engaged. Since the left side surface of the matching groove 46 is pressed substantially leftward, the pinch roller lever 41 is moved to the normal position.

In the play mode, the pinch roller lever 41 is engaged to move integrally with a direction lever, which will be described later, and when the direction lever is moved by an auto-reverse mechanism, which will be described later, the pinch roller lever 41 is moved by it. Ru.

(e-3, Pinch roller crimping and its release) [10th
11 and 14. Pressing of the covinch rollers 42, 42' against the capstan 4,4' is carried out as follows.

When the head base 21 moves backward from the normal position of the pinch roller lever 41 to a position slightly in front of the play position, as shown in FIG. 14(A), the N side pinch roller 42 moves backward. The pinch roller 42 is brought into contact with the N-side capstan 4 from the diagonally right side of the front corner, and from this state, the pinch roller 42 is prevented from moving straight rearward. Therefore, from this state until the head base 21 reaches the play position, the pinch roller 42 is moved so as to roll counterclockwise when viewed from above on the outer peripheral surface of the capstan 4. As a result of this movement, the head is moved slightly to the right from its previous position relative to the head base 21, as shown in FIG. . Note that even if the pinch roller lever 41 moves in this way, the amount of movement is only a small amount, so the pinch roller 4
1 never exceeds the intermediate position to the right, so the state in which the elastic force of the toggle spring 52 biases the pinch roller lever 41 toward the left is maintained.

When the head base 21 moves from the normal position of the pinch roller lever 41 to the play position, the pinch roller lever 41 is activated by the toggle spring 52.
The moving force on the left side -2, which is biased by 1, acts as a force that presses the N-side pinch roller 42 against the N-side capstan 4.

Furthermore, when the head base 21 moves backward from the state where the pinch roller lever 41 is in the reverse position and comes to a position slightly in front of the play position, the R side pinch roller The pinch roller 42' is brought into contact with the R side gear stan 4' slightly diagonally from the front left side, and from this state, the pinch roller 42' is prevented from moving straight rearward. Therefore, from this state until the head base 21 reaches the play position, the pinch roller 42' is moved so as to roll clockwise when viewed from above on the outer peripheral surface of the capstan 4'. This movement of the pinch roller lever 42' causes the pinch roller lever 41 to resist the rightward force biased by the toggle spring 52 and move from its previous position relative to the head base 21, as shown in FIG. Moved slightly to the left. Since this movement is only a small amount, the pinch roller lever 41 does not move beyond the intermediate position to the left, and therefore, the force of moving the pinch roller lever 41 to the right is still applied.

When the pinch roller lever 41 moves from the reverse position to the head base 21 or the play position, the pinch roller lever 41 is activated by the toggle spring 52.
1 acts as a force that presses the R-side pinch roller 42' against the R-side gear stan 4'.

That is, one toggle spring 52 is attached to the pinch roller lever 41.
spring means and two beach rollers 42.4 for applying a click lock in the normal position and reverse position.
2' to the capstan 4.4' selectively.

Then, such a toggle spring 52 is attached to the head base 21.
Since the toggle spring 52 is disposed inside the push button 29 that is necessary for the toggle spring 52, there is no need to prepare a special space for disposing the toggle spring 52.

(e-4, Tape running and crimping switching) [Figures 10 and 11] The pinch roller 42 or 42' is pressed against the capstan 4.4' when the tape cassette is installed. This is done with a magnetic tape 33 in between. Therefore, when the tape cassette is installed, the motor 10
When the N-side pinch roller 42 is pressed against the N-side capstan 4, the magnetic tape 33 is moved in the normal direction by the capstan 4 and the pinch roller 42, that is, when it is engaged with the R-side thread base 5'. The tape is pulled out from one tape reel (not shown) that is connected to the tape reel, is wound up on the other tape reel (not shown) that is engaged with the N-side reel stand 5, and runs in the direction in which the tape reel is pulled out, and the R-side pinch roller 42' The capstan 4' and the pinch roller 42' press the magnetic tape 33 onto the R side gear stan 4'.
is driven in the reverse direction, which is opposite to the normal direction.

Note that the mode in which recording and playback are performed while the magnetic tape 33 runs in the normal direction is the normal play mode, and the mode in which recording and playback are performed while the magnetic tape 33 runs in the reverse direction is the reverse play mode. So-
It is de.

Then, when the pinch roller lever 41 is moved to the right by operating the switching lever 53 or moving the direction lever described later from the state in which the N-side pinch roller 42 is pressed against the capstan 4, the N-side pinch roller 42 is pressed against the capstan 4. 42 is separated from the capstan 4, and when the pinch roller lever 41 comes just before reaching the right end of its movement range, the R side pinch roller 42' is pressed against the capstan 4', thereby changing the running direction of the tape. You can switch from the normal direction to the reverse direction. In addition, on the contrary, when the R side pinch roller 42' is pressed against the capstan 4, the switching lever 5
3 is operated or the direction lever described later is moved and the pinch roller lever 41 is moved to the left, the R side pinch roller 42' is separated from the capstan 4' and the pinch roller lever 41 is moved within the movement range. Just before reaching the left end, the N-side pinch roller 42 is pressed against the capstan 4, thereby switching the running direction of the tape from the reverse direction to the normal direction.

(f, direction lever) [Fig. 1, Fig. 2, Fig. 4
Figures 8, 10 to 14, 16, 18
20 ] 54 is a direction lever.

The direction lever 54 has a plate shape that is elongated in the left and right direction, and has guided elongated holes 55.5 that are elongated in the left and right directions at both left and right ends thereof.
5 are formed, and the lower part of the support sleeve 3.3 is slidably engaged with these guided elongated holes 55.55, so that it can be slid on the lower surface of the mechanical chassis 2 in the left and right direction within a certain range. The lock lever is
It is located in line with the rear side of 34.

The front end surface of the direction lever 54 is provided with two pressed parts 56 a and 56 b protruding from each other in the left-right direction at a position near the left end thereof, and a substantially U opening at the front end at a position near the right end. A letter-shaped engagement notch 57 is formed, and a return spring 58 is provided at a position near the left end of the rear surface.
is installed protrudingly. The return spring 58 consists of two elastic pieces 59 and 60 that are spaced from each other in the left and right direction, and these two elastic pieces 59 and 60 have a substantially V-shape that opens toward the front when viewed from above. Arms 59a farther from each other,
The front end of the direction lever 60a is connected to the rear end surface of the direction lever 54, and the other arms 59b, 60b (hereinafter referred to as "r contact arm")
Say. ) are located so that the sheath layers are interleaved in the left and right direction and are parallel to each other.

Reference numeral 61 denotes a first depressed projection erected from approximately the center of the upper surface of the direction lever 54; 62 is a second depressed projection erected from the front end of the central portion of the lower surface of the direction lever 54; The upper end of the pressed projection 61 of No. 1 is connected to the insertion hole 2a formed in the mechanical chassis 2 and the head base 2.
It is located in the control hole 51 of the pinch roller lever 41 through the long hole 21a formed in the pinch roller lever 1.

The function of the direction lever 54 will be described later.

(g, fast forward lever, rewind lever) [Fig. 1, Fig. 2, Fig. 4, Fig. 8, Fig. 12, Fig. 13, Fig. 15] 63 and 64 move the magnetic tape 33 at high speed. This is a lever that is operated when forming a high-speed running mode for running, and is 63
64 is a fast-forward lever for forming a fast-forward mode in which the magnetic tape 33 is run at high speed in the normal direction, and 64 is a rewind lever for forming a rewind mode in which the magnetic tape 33 is run at high speed in the reverse direction. .

These fast-forward lever 63 and rewind lever 64 have plate shapes that are long in the front-rear direction, and are arranged side by side to the left and right. It is supported so as to be movable, and is biased forward by the elastic force of a torsion spring 65.

The left end surface 66 of the fast forward lever 63 is located approximately in the middle in the front-rear direction, and the right end surface 67 of the rewind lever 64
Notches 66a, 67 are provided at approximately the middle portion in the front-rear direction.
a front end portion 66b of the cutouts 66a, 67a;
67b is a suppressing surface that is inclined so as to be displaced rearward as it goes deeper into the notch.

Furthermore, the rear end surfaces 68 of the fast forward lever 63 and the rewind lever 64
．． 69 is a slope facing upward at the rear (hereinafter referred to as "gear push-up surface")
Say. ) is formed.

When the fast forward lever 63 and the rewind lever 64 are in the non-pushing position shown in FIG.
6b and 67b are positioned so as to be close to the movement locus of the second pressed projection 62 of the direction lever 54 from the front.

70. 70' is a locked bin protruding from the upper surface of the fast forwarding lever 63 and the rewinding lever 64 at a position close to the front end;
The upper part of these locked bins 70, 70' is a lock lever.
34, each located separately within a hole 35,37 formed in 34.

When the fast forward mode is established, the fast forward lever 63
is pushed to the push-in position shown in FIG. 12, and when the rewind mode is established, the rewind lever 64 is pushed to the push-in position shown in FIG. 13, and the fast-forward lever 63 or The rewinding lever 64 has its locked pin 70.70' connected to the lock pawl 38. of the lock lever 34.
It is held in that position by engaging and locking with the lock surfaces 38a, 38a of 38, and the lock is released by pushing the stop lever 39 into the lock lever 34.
This is done by moving the lock in the lock release direction.

The formation of the fast forward mode by the fast forward lever 63 and the formation of the rewind mode by the rewind lever 64 will be described later.

(h Reel stand drive mechanism) [Fig. 1, Fig. 2, Fig. 4,
6, 8 to 13, 15, 17 to 19] 71 is a reel for alternately rotating either one of the reel stands 5 and 5' at low speed or high speed. It is a table drive mechanism,
It consists of a rotatable rocking lever, a gear ratio switching gear supported by the rocking lever so as to be vertically displaceable, the direction lever 54, and the like.

(h-i, swinging lever) [Fig. 1, Fig. 2, Fig. 4, Fig. 6, Fig. 8 to Fig. 13, Fig. 15, Fig. 18, Fig. 19] 72 is a swinging lever. It's a lever.

The swing lever 72 has a substantially dogleg shape that is long in the front and back direction when viewed from above, and its bent portion is formed slightly thicker, and an insertion hole 73 is formed in this portion. Further, a gear support shaft 74 is provided vertically from a position near the rear end, a spring hook projection 75 is provided on the lower surface of the rear end, and a connecting projection 76 is provided on the lower surface of the front end. Furthermore, a stopper pin 77 is provided upright from the rear end of the swing lever 72 on the upper surface.

The upper end 20a of the support shaft 20 supporting the cam gear 14 is inserted into the insertion hole 73, whereby the swing lever 72 is rotatably supported on the lower surface of the mechanical chassis 2.

Reference numeral 78 denotes a regulating elongated hole formed in the mechanical chassis 2, and the regulating elongated hole 78 is centered on the center of rotation of the swing lever 72 at a position approximately midway between the two reel stands 5 and 5'. The stopper pin 77 of the swing lever 72 is located within this long regulating hole 78 which is formed in an arc shape.

Therefore, the rotation range of the swing lever 72 is between the position where the stopper pin 77 abuts the right end of the regulation elongated hole 78 as shown in FIG. 1 (hereinafter referred to as the "normal position") and the position shown in FIG. As shown, the stopper pin 77 is regulated between the position where it abuts the left end of the regulation slot 78 (hereinafter referred to as the "reverse position").

Reference numeral 79 denotes a spring hook protrusion protruding from the lower surface of the mechanical chassis 2, and the spring hook protrusion 79 is located at a position closest to the spring hook protrusion 75 of the swinging lever lever 2 which is at an intermediate position in the rotation range. provided, these two spring-loaded protrusions 75 and 7
9 is a toggle spring 800 with a gun-shaped spring shape, and two arms 80a.
, 80b are individually attached.

Therefore, due to the elastic force of the toggle spring 80, the swinging lever 72 has a rotational force in opposite directions from the intermediate position, i.e., when it is to the right from the intermediate position, it is at the normal position. The rotational force towards the side, and the rotational force towards the reverse position when it is to the left of the intermediate position.
Each is energized.

The swing lever 72 is moved to the normal position when normal play mode or fast forward mode is established, and is moved to the reverse position when reverse play mode or rewind mode is established.

(h-2, gear ratio switching gear) [Figures 1, 2, 4, 6, 8 to 13, 15, 17 to 19] 81 is a gear It is a ratio switching gear, and is equipped with two large and small gears and is displaceable in the axial direction, and this one gear ratio switching gear 81 allows the two reel stands 5 and 5' to be adapted to the type of operation mote concerned. It is designed to rotate at a corresponding speed.

(h-2-a, structure) P2 is a large gear, which includes a gear portion 83 having a diameter nearly twice that of the small gear 17 of the cam gear 14, and a cylindrical boss portion 84 protruding downward from the center thereof. The base end portion of the boss portion 84, that is, the portion 84a continuous to the gear portion 83 is made to have a slightly larger diameter than the remaining portion,
Further, a large recess 83a is formed on the upper surface of the gear portion 83, and an annular groove 83b coaxial with the boss portion 84 (see FIG. 9) is formed on the bottom surface of the recess 83a.

A small gear 85 has a diameter approximately half the diameter of the large gear 82, and the lower end of the boss portion 84 of the large gear 82 is press-fitted into a press-fit hole 85a formed in the center thereof. Therefore,
These large gear 82 and small gear 85 rotate integrally.

Note that a circular recess 85b is formed on the upper surface of the small gear 85.

Then, the swing lever 72 is inserted into the hole of the boss portion 84 of the large gear 82.
A gear support shaft 74 is rotatably inserted through the gear support shaft 74 , and a retaining ring 86 is engaged with the lower end of the gear support shaft 74 . The annular groove 83b is compressed between the bottom surface of the annular groove 83b and the lower surface of the swing lever 72.

As a result, the gear ratio switching gear 81 is rotatably supported by the gear support shaft 74 of the swing lever 72, and is biased with a downward moving force by the elastic force of the coil spring 87.

The center of rotation of the swinging lever 72 supporting the gear ratio switching gear 81 is aligned with the rotation axis of the cam gear 14, so when the swinging lever 72 swings, the gear ratio switching gear 81 rotates. It is rotated around the rotation axis of the cam gear 14. Furthermore, the positional relationship between the gear ratio switching gear 81 and the cam gear 14 when viewed from above is as follows: gear ratio switching gear 81 large gear 82
The pitch circle of the gear teeth of the small gear 17 of the cam gear 14 is circumscribed, and the pitch circle of the gear teeth of the small gear 85 of the gear ratio switching gear 81 and the gear teeth of the cam gear 140 and the large gear 15 are circumscribed. is in a circumscribed relationship with the pitch circle. Therefore, the gear teeth of the gear ratio switching gear 81 and the cam gear 14
When the gear teeth are at the same height, the gear ratio switching gear 81
This will mesh with the cam gear 14.

When the gear ratio switching gear 81 is not pressed upward, as shown in FIG.
Say. ), and when it is at this deceleration position, the gear portion 83 of the large gear 82 meshes with the small gear 17 of the cam gear 14, and the small gear 85 meshes with the small gear 17 of the cam gear 14.
It is located slightly lower than the large gear 15.

Furthermore, when the fast forwarding lever 63 or the rewinding lever 64 is pushed into the push-in position, the gear ratio switching gear 81 is pushed up by the levers 63 and 64, and is thereby moved slightly above the deceleration position in FIG. When the gear 85 is moved to the position shown in FIG. It is located higher than the small gear 17 of.

Incidentally, when the gear ratio switching gear 81 is in the deceleration position, the large gear 82 is connected to the direction conversion gear 9 and the R side wheel base 5'.
(see FIGS. 8 and 9), and when the gear ratio switching gear 81 is pushed up to the speed increasing position, the large gear 82 is located at a height corresponding to the axially intermediate portion of the direction changing gear 9 and the upper end of the reel stand gear 7' (see FIG. 15).

The large gear 82 of the gear ratio switching gear 81 is engaged with the direction changing gear 9 when the swing lever 72 comes to the normal position (see Fig. 1), and when the swing lever 72 comes to the reverse position It meshes with the reel stand gear 7' (see FIG. 11).

(h-2-b, Rotation of reel stand, switching gear ratio) When the motor 10 rotates, the gear ratio conversion gear 8
1 is rotated counterclockwise when viewed from above, and when the swing lever 72 is in the normal position, the rotation of the cam gear 14 is transferred to the N-side reel stand 5 via the gear ratio switching gear 81 and the direction conversion gear 9. When the reel stand 5 is rotated in the counterclockwise direction (hereinafter referred to as the "tape winding direction") when viewed from above, and the swing lever 72 is in the reverse position, the cam gear 14 The rotation of gear ratio switching gear 81
The tape is transmitted to the R side reel stand 5' through the reel stand 5', so that the reel stand 5' is rotated in the clockwise direction (hereinafter referred to as the "tape winding direction") when viewed from above.

When the gear ratio switching gear 81 is in the deceleration position, the large gear 82 of the gear ratio switching gear 81 and the small gear 17 of the cam gear 14 mesh with each other, thereby changing the gear ratio of the gear ratio switching gear 81 to the cam gear 14. Since the rotational speed of the cam gear 14 is reduced and transmitted to the gear ratio switching gear 81, the reel stand 5 or 5' is rotated at a low speed. Further, when the gear ratio switching gear 81 is in the speed increasing position, the gear ratio of the gear ratio switching gear 81 to the cam gear 14 is changed by meshing with the small gear 85 of the gear ratio switching gear 81 or the large gear 15 of the cam gear 14. Since the speed is increased, the rotation of the cam gear 14 is increased and the gear ratio switching gear 81 is
As a result, the reel stand 5 or 5' is rotated at high speed.

Therefore, in the fast forward mode, the N side reel stand 5 is rotated at high speed in the tape winding direction, and in the rewind mode, the N side reel stand 5 is rotated at high speed in the tape winding direction.
The side reel stand 5' is rotated at high speed in the tape winding direction, the N side reel stand 5 is rotated at low speed in the tape winding direction in normal play mode, and the R side reel stand 5' is rotated at low speed in the tape winding direction in normal play mode. The reel stand 5' is rotated at a low speed in the tape winding direction, and such selective rotation of the reel stand 5 or 5' and switching of its rotational speed are performed by one gear ratio switching gear 8.
This can be done by simply selecting position 1.

(h-3, Movement of the swinging lever) [Figures 1, 10, and 11] The connecting protrusion 76 provided at the front end of the swinging lever 72 is connected to the engagement notch formed in the direction lever 54. 57
is rotatably and slidably engaged with.

Therefore, the movement stroke of the direction lever 54 is regulated to be the same as the movement stroke of the connecting protrusion 76 in the left and right direction, so that the movement range of the direction lever 54 is limited to the position when the swing lever 72 comes to the normal position. , that is, the normal position and the swing lever 7 shown in FIG.
2 is in the reverse position, that is, the reverse position shown in FIG. Further, the rotation force applied to the swing lever 72 by the toggle spring 80 also acts on the direction lever 54. Therefore, when the direction lever 54 is to the left of the intermediate position in its movement range, it is in the normal position. A moving force toward the side is applied, and when the position is to the right of the intermediate position, a moving force is applied toward the reverse position.

Therefore, when the direction lever 54 moves from the normal position to the reverse position, the swing lever 72 is also moved from the normal position to the reverse position.
When the direction lever 54 moves from the reverse position to the normal position, the swing lever 72 moves from the reverse position to the normal position.

As described above, the upper end of the first pressed protrusion 61 of the direction lever 54 is connected to the pinch roller lever 4.
It is located in the control hole 51 of No. 1.

Note that the movement stroke of the pinch roller lever 41 in the left-right direction is made larger than the movement stroke of the direction lever 54, and the left-right width of the regulating portion 51b of the control hole 51 is larger than the left-right width of the pressed protrusion 61 of the direction lever 54. It is slightly larger.

Furthermore, when the head base 21 is at the stop position, the control hole 51 has a non-restricted portion 5fa that is connected to the pressed projection 6.
When the head base 21 moves to the play position, its regulating portion 51b is located on the eight movement trajectory of the pressed protrusion 61.

Then, when the head base 21 is at the stop position and both the pinch roller lever 41 and the direction lever 54 are at the normal position, the pressed protrusion 61 is moved toward the right side of the regulating portion 51b of the control hole 51. A pinch roller lever 41 is positioned corresponding to the biased portion.
When the direction lever 54 and the direction lever 54 are both in the reverse position, the pressed protrusion 61 or the regulating portion 5 of the control hole 51
It is located corresponding to the part of 1b that is biased to the left,
Therefore, when the head base 21 moves from such a state to the play position, the pressed protrusion 61 is only positioned relative to the regulating part 51b of the control hole 51, so the direction lever 54 is not moved. There is nothing to do,
Therefore, the swing lever 72 is also held in the same position.

Further, when the direction lever 54 is in the reverse position and the pinch roller lever 41 is in the normal position, the pressed protrusion 61 is pressed against the pressing KA on the right side of the control hole 51.
51c are facing each other, when the head base 21 moves from this state to the play position, the pressing edge 51c presses the pressed protrusion 61 approximately to the left and moves the direction lever 54 to the normal position. and this causes
The swing lever 72 is moved from the reverse position to the normal position. Also, on the contrary, the direction lever 5
4 is in the normal position and the pinch roller lever 41 is in the reverse position, the left pressing edge 51d of the control hole 51 faces the pressed protrusion 61. From this state, the head base 21 or the play position When you move to
The pressing edge 51d presses the pressed projection 61 approximately to the right to move the direction lever 54 to the reverse position by 8G, thereby moving the swing lever 72 from the normal position to the reverse position.

Note that the pressing edges 51c and 51d of the control hole 51 are the pressed projections 6.
1, the direction lever 54 receives a load that resists the moving force of the toggle spring 80 that is biased, but the elastic force of the toggle spring 52 that holds the pinch roller lever 41 in the normal position or reverse position is Since the elastic force is stronger than that of the toggle spring 80, the pinch roller lever 41 will not be moved by the above load.

Further, in this manner, when the head base 21 is in the play position, the pressed protrusion 61 is in contact with the regulating portion 5 of the control hole 51.
1b, the direction lever 54 and the pinch roller lever 41 are always moved integrally in this state. Therefore, when the switching lever 53 is operated and the pinch roller lever 41 is moved, the control hole 51 is moved depending on the position of the pinch roller lever 41 at that time.
The right or left edge of the regulating portion 51b presses the pressed protrusion 61 of the direction lever 54 leftward or rightward, thereby moving the direction lever 54, thereby moving the swinging lever 72. Also,
When the direction lever 54 is moved by an auto-reverse mechanism to be described later, the swing lever 72 is moved and the direction lever 5 is moved according to the position at that time.
The pinch roller lever 41 is moved by the pressed protrusion 61 of No. 4 pressing the right side edge or the left side edge of the regulating portion 51b of the pinch roller lever 41 to the right or to the left.

On the other hand, when the high-speed running mode is established, the swing lever 72
The position of is determined by the fast forward lever 63 or the rewind lever 64 via the direction lever 54.

That is, when the direction lever 54 is at the normal position while the fast forwarding lever 63 and the rewinding lever 64 are in the non-depressed position, the second pressed projection 6
2 is located in a notch 67a formed in the rewind lever 64 (see FIG. 2), and when the direction lever 54 is in the reverse position, a pressed projection 62 is formed in the fast forward lever 63. located within the notch 66a (
(See Figure 13). Therefore, when the fast-forward lever 63 moves from the normal position of the direction lever 54 to the push-in position, the pressed projection 62 is not pressed, so the direction lever 54 and the swing lever 72 remain as they are. is held in position, but the rewind lever 64
When it moves to the push-in position by X3, its pressing surface 67b presses the pressed protrusion 62 approximately to the right, so the direction lever 54 is moved to the hearth position, and the swing lever 72 is moved to the reverse position. In addition, when the direction lever 54 is moved from the reverse position to the rewind lever 64 or the pushed position, the suppressed protrusion 6
2 is not pressed, so the direction lever 5
4 and the swing lever 72 are held in the same position, but when the fast forward lever 63 moves to the push position, its pressing surface 66b presses the pressed protrusion 62 approximately to the left, so the direction lever 54 is moved to the normal position, and the swing lever 72 is moved to the normal position l.

Therefore, the swing lever 72 is connected to the direction lever 54.
When the pinch roller lever 41 is in the normal position, the pivot lever 72 is held in the normal position, and when the pinch roller lever 41 is in the reverse position, the swing lever 72 is in the reverse position. Further, when the fast forward lever 63 is in the pushed position, the swinging lever 72 is held in the normal position, and when the rewind lever 64 is in the pushing position, the swinging lever 72 is held in the reverse position.

(i. Formation of moat) [Figures 10 to 13, 15
Figure] (i-1, Playmote) [Figures 10 and 11 The state shown in Figure 10 is the normal playmode. In this state, the head base 21 is in the play position, the tape contact surface 22a of the magnetic head 22 is in contact with the magnetic tape 33, and the N-side pinch roller 42 is in contact with the magnetic tape 33.
is crimped to the N-side capstan 4 with the direction lever 54 in the normal position.
The swing lever 72 is in the normal position, and the gear ratio switching gear 81 is meshed with the N-side reel stand 5 via the direction conversion gear 9. Therefore, in this state, the magnetic tape 33 is run in the normal direction by the capstan 4 and the pinch roller 42, and the reel stand 5 is rotated at low speed in the tape winding direction, so that the magnetic tape 33 is moved to the reel stand 5. The tape is wound onto the tape reel that is engaged with the tape reel.

Further, the state shown in FIG. 11 is the reverse play mode. In this state, the head pace 21 is in the play position as in the normal play mode, and the magnetic head 2
2 is in contact with the magnetic tape 33, the R side pinch roller 42' is pressed against the R side gear stan 4' with the magnetic tape 33 in between, and the direction lever 54 is in the reverse position. 72 or reverse position and the gear ratio switching gear 81 is on the R1 reel stand 5.
' is meshed with the reel base gear 7'. Therefore, in this state, the magnetic tape 33 is run in the reverse direction by the capstan 4' and the pinch roller 42', and
Since the reel stand 5' is rotated at low speed in the tape winding direction, the magnetic tape 33 is wound onto the tape reel engaged with the reel stand 5'.

As described above, the gear ratio switching gear 81 is moved to the speed increasing position when the fast forward lever 63 or the rewinding lever 64 is pushed in, so in Playmoto, the gear ratio switching gear 81 is moved to the decelerating position. Yes, therefore, reel stand 5.5'
will be rotated at low speed.

The above-mentioned normal play mode can be set by pushing the head gear 21 from the state where the pinch roller lever 41 is in the normal position, or by operating the switching lever 53 from the reverse play mode to move the pinch roller lever 41 to the normal position. Further, when the tape end is reached from the reverse play mode, the tape is moved to the normal position by the direction lever 54 or an auto-reverse mechanism, which will be described later.

In addition, the above-mentioned reverse play mode can be activated by pushing the head pace 21 from the state where the pinch roller lever 41 is in the reverse position, or by operating the switching lever 53 from the normal play mode to move the pinch roller lever 41 to the reverse position. Further, when the tape end is reached from the normal play mode, the direction lever 54 is moved to the reverse position by an auto-reverse mechanism to be described later.

In addition, in such a play mode, the head pace 21 is returned to the stop position by pressing the stop lever 39, or by pressing the fast forward lever 63 or tape measure lever 64 to move the lock lever 34 in the unlocking direction. It is canceled by

(i-2, High Speed Travel Mode) [FIGS. 12, 13, and 15] The state shown in FIG. 12 is the fast forward mode, and the state shown in FIG. 13 is the rewind mode. In these fast forward mode and rewind mode, the gear ratio switching gear 81 is located at the speed increasing position.

That is, when the fast forward lever 63 or the rewind lever 64 is pushed in, the gear push-up surfaces 68 and 69 move toward the gear ratio switching gear 8.
The fast forward lever 63 moves rearward while abutting against the outer periphery of the lower surface of the gear part 83 of No. 1 and pressing it backward and upward.
Or, when the rewinding lever 64 reaches the push-in position device, the portion of the upper surface of these levers 63, 64 that is continuous with the gear push-up surface 68, 69 comes into contact with the lower surface of the gear portion 83 (see FIG. 15).
As a result, the gear ratio switching gear 81 is pushed up to the speed increasing position and held there. And the fast forward lever 63
If the direction lever 54 is in the hearth position when the rewind lever 64 is pushed in, the direction lever 54 is moved to the normal position by the fast forward lever 63 as described above, and when the rewind lever 64 is pushed in, the direction lever 54 is moved to the normal position as described above. When the direction lever 54 is at the normal position, the direction lever 54 is moved to the reverse position by the rewind lever 64.

In the early retraction mode, the N-side reel stand 5 is rotated at high speed in the tape winding direction, and in the rewind mode, the N-side reel stand 5 is rotated at high speed in the tape winding direction.
The side roll table 5' is rotated at high speed in the tape winding direction.

For such high-speed running motors, the lock lever can be locked by pushing in the stop lever 39, the head base 21, or a lever for a different high-speed running motor.
34 in the unlocking direction l\.

(j, auto-reverse mechanism) [Fig. 1, Fig. 2, Fig. 4, Fig. 6, Fig. 8 to Fig. 11, Fig. 16 to Fig. 20] 88 has changed from play mode to tape end This is an ortho-rehalf mechanism that automatically switches the running direction of the tape by moving the direction lever 54 when the tape reaches the end.The cam gear 14, the direction lever 54, and the detection lever have different positions when the tape end is reached and at other times. and a rotating lever that is rotated when pressed by the detection lever to move the direction lever 54 by fJ.

(j-1, rotating lever) [Figures 1, 2, 4, 10, 11, 16 to 20, 89 is a rotating lever.

The rotary lever 89 is long in the front-rear direction, and the intermediate portion thereof is formed into a cylindrical host portion 90. A pressing bottle 91 is provided at the front end to protrude downward, and a pressed bottle 91 is provided at the rear end. The portion 92 is provided to protrude downward, and the rear portions 93a and 94a (hereinafter referred to as “
"The oppressed side." ) are formed on sloped surfaces that approach each other toward the rear end and are continuous from the rear end.

95 is the R side gear stan 4 on the lower surface of the mechanical chassis 2
It is a support shaft formed at a position spaced apart from ' to the right rear side, and the boss part 90 of the rotary lever 89 is rotatably supported by the support @95, and the suppressed part 92 or the direction lever 54 is rotatably supported. is located between the two elastic pieces 59 and 60 of the return spring 58 formed on the direction lever 54, and the suppression bin 91 is located between the two pressed parts 56a and 56b formed on the direction lever 54. ing.

When the direction lever 54 is in the normal position, as shown in FIG.
The pressure bottle 91 is held in a position where it is in contact with the pressed portion 56b on the right side of the direction lever 54 (hereinafter referred to as the "first position"), and this holding is done by the right elastic contact piece of the return spring 58. The contact arm 60b of 60 lightly elastically contacts the front part of the right side surface 93 of the pressed portion 92 of the rotary lever 89 to apply a rotational force to the rotary lever 89 in the counterclockwise direction when viewed from above. It is done by. In addition, direction lever 5
When the four-barrel hearth position is reached, as shown in the 11th image, the rotating lever 89 is moved from the first position with its pressing pin 91 abutting against the pressed portion 56a of the left ff1ll of the direction lever 54. It is held in a position slightly rotated clockwise (hereinafter referred to as the "second position J"), and this holding is done by the contact arm 59 of the elastic piece 59 on the left side of the return spring 58.
This is achieved by lightly elastically contacting the front portion of the left side surface 94 of the pressed portion 92 to apply a rotational force to the rotational lever 89 in the clockwise direction when viewed from above.

Note that since the amount of displacement between the first position and the second position of the rotary lever 89 is small, the pressed surface 93a on the right side of the pressed portion 92 is It faces diagonally backward to the right, and the left pressed surface 94a faces diagonally backward to the left.

(J-2 tape end detection means) [Figures 1, 2, 4, 6, 8 to 11, 16 to 19] (j-2-a structure) Reference numeral 96 denotes a short, generally annular cam wall formed on the lower surface of the large gear 15 of the cam gear 14, and a large portion 97a of the inner peripheral surface 97 extends in an arc shape centered on the axis of the cam gear 14. , a portion 97b thereof is formed into a flat surface extending in a direction perpendicular to the radial direction of the cam gear 14, and the flat surface 97
Both ends of b (hereinafter referred to as "return surface") are continuous to both ends of portion 97a (hereinafter referred to as "non-return surface") extending in the shape of an arc. Further, a scooping cam 98 having a substantially curved wedge shape when viewed from the axial direction is protruded from an area surrounded by a cam wall 96 on the lower surface of the large gear 15, and the scooping cam 98 is located at a position closer to the cam wall 96. The clockwise side end 98a (hereinafter referred to as the "scooping end") when viewed from above is pointed, and the central angle about the axis of the cam gear 14 is approximately 70 degrees.
The scooping end 98 is spaced approximately 90° counterclockwise from the counterclockwise side end of the return surface 97b, and has two arcuate side surfaces 98b;
The surface 98b of the 98c that is closer to the center of the cam gear 14 (
Hereinafter, it will be referred to as the "scooping side." ) is formed to approach the center of the cam gear 14 as it goes from the scooping end 98a to the other end, and the other surface 98c is formed to extend parallel to the non-returning surface 97a.

Reference numeral 99 denotes a detection lever, which includes a cylindrical boss portion 100 and three arms 101 extending horizontally from the boss portion 100.
．． 102 and 103 are integrally formed, and the boss portion 100
is a support shaft 1 protruding downward from the mechanical chassis 2.
It is rotatably supported by 04. When seen with the detection lever 99 in the posture shown in FIG. A relatively small scooping protrusion 106 is formed on the top surface of the distal end of the arm 102 that protrudes toward the front from the boss 100 to the right and slightly forward, and furthermore, a relatively small scooping protrusion 106 is formed on the upper surface of the distal end of the arm 102 that extends diagonally forward from the boss 100 to the left. A pressing portion 107 is formed on the top surface of the distal end of the arm 103 extending toward.

Incidentally, both the scooped projection 106 and the pressing portion 107 are approximately wedge-shaped.

The tip of the arm 102 is brought close to the cam gear 14 from below, so that the scooped projection 106 is located on the inside of the cam wall 96 and approximately to the front left of the boss 16 of the cam gear 14. Its sharp tip 106a
When viewed from above, it is said to be oriented slightly to the right and diagonally forward.

Further, the pressing portion 107 is a pressed portion 9 of the rotary lever 89.
The pointed tip 107a faces substantially forward, and the rotation locus of the tip 107a is similar to the first
The pressed surface 93 on the right side of the rotating lever 89 is at the position of
a and the rear end of the left pressed surface 94a of the rotary lever 89 in the second position (see FIGS. 10 and 11). .

Reference numeral 108 has a swing lever and a substantially ring-shaped base 10.
9 and an arm 110 protruding from the upper end of the base 109 in the radial direction of the base 109 are integrally formed, and the arm 110 has a notch extending along its longitudinal direction and reaching its tip. 1
1110a is formed. The base 109 is rotatably fitted onto the upper end 84a of the boss 84 of the gear ratio switching gear 81, and a recess formed in the lower surface of the base 109 and the small gear 85 of the gear ratio switching gear 81. A coil spring 111 with a small spring constant is connected to the bottom surface of 85b.
has been reduced (see Figure 9).

Thus, the oscillating lever 108 is rotatably supported by the boss portion 84 of the gear ratio switching gear 81, and is brought into elastic contact with the lower surface of the large gear 82 with appropriate strength by the elastic force of the coil spring 111. Therefore, while the gear ratio switching gear 81 is rotating, a rotational force is applied to the vibration reduction lever 108 in the counterclockwise direction when viewed from above.

Then, with the swinging lever 108 in a state where its arm 110 extends substantially toward the center of rotation of the detection lever 99, the linking pin 105 of the detection lever 99 is slidably engaged with the cut groove 1108. will be combined.

(j-2-b, action) As described above, in the play mode, the gear ratio switching gear 81 is located at the deceleration position, and the large gear 82 is the small gear of the cam gear 14! 7, and therefore, while the motor 10 is rotating and the reel stand 5 or 5' is being rotated, the large gear 15 and the small gear 17 of the cam gear 14 are rotated integrally. When the tape reaches the tape end and the rotation of the reel stand 5 or 5' is blocked, both the gear ratio switching gear 81 and the small gear 17 of the cam gear 14 meshing with it are blocked from rotating. 14 is rotated with only its large gear 15 slipping relative to the small gear 17.

Therefore, as described above, while the gear ratio switching gear 81 is rotating, the rotational force in the counterclockwise direction is applied to the oscillating lever 108, so that the arm 110 is attached to the linking pin of the detection lever 99. 105 in the counterclockwise direction when viewed from above, thereby applying a rotational force to the detection lever 99 in the clockwise direction when viewed from above, and this rotational force causes
The detection lever 99 is rotated until the scooped projection 106 comes into contact with the inner peripheral surface 97 of the cam wall 96.

Since the non-returning surface 97a forming most of the inner circumferential surface 97 of the cam wall 96 has a constant distance from the rotation center of the cam gear 14, while the scooped protrusion 106 is in contact with the non-returning surface 97a, See Figure 2 and Figure 17 (A).
The figure shows the swing lever 72 in its normal position. ), the position of the scooped projection 106 is held constant, so the detection lever 99 is held at the position shown in FIG. 17(A) (hereinafter referred to as the "non-operating position").

Further, since the return surface 97b of the inner peripheral surface 97 of the cam wall 97 extends in a direction perpendicular to the radial direction of the cam gear 14, the distance of the return surface 97b from the center of the cam gear 14 is greater than that of the non-return surface 97a. It becomes shorter, and becomes the shortest at the midpoint. Therefore, when the return surface 97b opposes the scooped projection 106 from the state where the scooped projection 106 is in contact with the non-return surface 97a, the scooped projection 106 is pushed back toward the approximate center of the cam gear 14. The detection lever 99 is rotated counterclockwise from the non-operating position, and the scooped protrusion 106 contacts the intermediate point of the return surface 97b (see FIG. 17(B)). is moved six times to move away from the center of the cam gear 14, and when the scooped protrusion 106 comes off the return surface 97b and comes into contact with the non-return surface 97a, the detection lever 99 stops rotating and returns to the non-operating position. Retained.

That is, the gear ratio switching gear 81 is rotating and the oscillating lever 1
While the rotational force is applied to 08, the cam gear 14 is
During rotation, the detection lever 99 moves between the inoperative position and FIG.
It is swung back and forth once between the position shown in B) (hereinafter referred to as the "intermediate position").

Note that when the detection lever 99 comes to the intermediate position, the pressing portion 1
As shown in FIG. 17(B), the pressed portion 92 of the rotary lever 89 is approached from behind, and the detection lever
is in the non-operating position, the tip 106a of the scooped protrusion 106 is outside the rotation locus of the scooping end 98a of the scooping cam 98, and when the detection lever 99 comes to the intermediate position, the tip 106a of the scooped protrusion 106 is located slightly inside the rotation locus of the scooping end 98a of the scooping cam 98.

Then, as shown in FIG. 17(B), the detection lever 99
When the scooping end 98a of the scooping cam 98 reaches the intermediate position, the scooping end 98a of the scooping cam 98 is spaced approximately 90 degrees counterclockwise from the scooped protrusion 106, and the detection lever 99 moves from this state to the cam gear 14 or approximately 20'. Since the scooping cam 98 returns to the actuated position after being rotated about 30 degrees, the scooping cam 98 passes inside the scooping protrusion 106 without coming into contact with it, as shown by the solid line in FIG. 17(A).

The above-mentioned movements occur while the gear ratio switching gear 81 is rotating, that is, while the tape has not reached the end, and such movements are performed in the same manner regardless of the type of play mode.

When the end of the tape is reached, the gear ratio switching gear 81 is prevented from rotating, so that the rotational force applied to the oscillating lever 108 is released, and as a result, the rotational force applied to the detection lever 99 by the oscillating lever 108 is released. is also solved. Then, only the large gear 15 of the cam gear 14 continues to rotate.

Therefore, the tape end is reached when the detection lever 99 reaches the intermediate position, or from the time when the detection lever 99 is moved to the intermediate position after reaching the tape end, the detection lever 99 is returned to the non-operating position. It will remain in the middle position.

In this state, the tip 106a of the scooped projection 106 is
is located on the inner side of the rotation locus of the scooping end 98a of the scooping cam 98, so the scooping surface 98b of the scooping cam 98 that has moved hits the scooped protrusion 106 from the outside, as shown in FIG. 17(C). contact, and the scooping surface 98b presses the scooped protrusion 106 substantially toward the center of the cam gear 14,
As a result, the detection lever 99 is further rotated counterclockwise from the intermediate position. And this rotation is the 17th
As shown by the two-dot chain line in Figure (C), the end of the scooping surface 98b on the anti-scooping end 98a reaches its maximum when it presses the scooped protrusion 106, and as a result, the detection lever 99 moves to two points in the figure. It is pushed to the position shown by the chain line (hereinafter referred to as the "operating position").

Note that when the scooping surface 98b comes off the scooping projection 106 from this state, the pressure on the scooping projection 106 by the scooping surface 98b is released, and therefore, when the rotation of the gear ratio switching gear 81 resumes, the detection lever 99 is It is returned to the non-operating position by the oscillating lever 108.

(j-3, automatic switching of tape running direction) [Figures 18 and 19] Then, when the tape reaches the end from the play mode, the rotation lever 89 is rotated by the detection lever 99, which moves to the above-mentioned operating position. Then, the direction lever 54 is moved, and thereby the swing lever 72 and the pinch roller lever 41 are moved to switch the tape running direction.

(j-3-a, Switching from Normal Play Mode to Reverse Play Mode) [Figure 18] When the tape end is reached from the normal play mode and the detection lever 99 moves to the operating position, the detection lever 99
The pressing portion 107 contacts the right pressed surface 93a of the pressed portion 92 of the rotary lever 89 and presses it toward the front left, thereby causing the rotary lever 89 to rotate counterclockwise. When the pressing pin 91 is moved, the direction lever 5
Since the pressed portion 56b on the right side of 4 is pressed rightward, the direction lever 54 is moved from the normal position to the reverse position.

This state is the state shown in FIG. 18(A), and as the direction lever 54 moves to the reverse position, the swing lever 72 is moved to the reverse position, and the first position of the direction lever 54 is moved to the reverse position. Pressed projection 61
is the regulating portion 51b of the control hole 51 of the pinch roller lever 41.
The pinch roller lever 41 is moved to the right by pressing the right edge of the R-side pinch roller 42', and as a result, the R-side pinch roller 42' is now pressed against the R-side gear stan 4'.

Thus, the tape running direction is switched to the reverse direction, and the R-side thread table 5' is rotated in the tape winding direction.

Furthermore, when the rotating lever 89 is rotated counterclockwise by the detection lever 99, the pressed portion 92 of the rotating lever 89 is provided on the direction lever 54, as shown in FIG. 18(A). The abutment arm 59b of the left elastic piece 59 of the return spring 58 is pressed to the left, thereby causing the elastic piece 59 to generate an elastic force that tries to push the pressed portion 92 back approximately to the right. Power is stored.

Immediately after the swing lever 72 leaves the first position and moves toward the reverse position, the rotation of the gear ratio switching gear 81 is restarted, and the swing lever 108 is again subjected to rotational force in the counterclockwise direction. As a result, the detection lever 99 is also biased with a rotational force in the counterclockwise direction, so that the detection lever 99 comes to the operating position and is immediately returned to the non-operating position.

As a result of the warping, the pressure on the rotating lever 89 by the detection lever 99 is released, so that the rotating lever 89 is pressed by the elastic piece 59 and moved to the second position, and is held there. This state is the state shown in FIG. 18(B).

(j-3-b, Switching from reverse play mode to normal play mode) [Figure 19] When the detection lever 99 moves to the operating position when the tape reaches the end from the reverse play mode, the detection lever 99
The pressing portion 107 contacts the left pressed surface 94a of the pressed portion 92 of the rotating lever 89 and presses it toward the front right, thereby rotating the rotating lever 89 clockwise. and the pressing pin 91 is pressed against the direction lever 54.
Since the pressed portion 56a on the left side of is pressed toward the left,
The direction lever 54 is moved from the reverse position to the normal position.

This state is the state shown in FIG. 19(A), and as the direction lever 54 moves to the normal position, the swing lever 72 is moved to the normal position, and the first position of the direction lever 54 is moved to the normal position. Pressed projection 61
is the regulating portion 51b of the control hole 51 of the pinch roller lever 41.
Press the left edge of the pinch roller lever 41 to move it to the left, and then the N side pinch roller 4
2 is crimped onto the N side capstan 4.

Thus, the tape running direction is switched to the normal direction, and the N-side reel stand 5 is rotated in the tape winding direction.

Furthermore, when the rotating lever 89 or the detection lever 99 is rotated clockwise, the pressed portion 92 of the rotating lever 89 is moved to the right side of the return spring 58, as shown in FIG. 19(A). The contact arm 60b of the elastic piece 60 is pressed to the right, thereby accumulating an elastic force in the elastic piece 60 to push the pressed portion 92 back toward the left.

Therefore, when the detection lever 99 escapes backward from the operating position, the pressure on the rotating lever 89 is released, and the rotating lever 89 is moved to the first position by the elastic force of the elastic piece 60 and held there. Retained. This state is the 19th
This is the state shown in Figure (B).

However, even though the movement of the detection lever 99 when the tape end is reached from the play mode is the same regardless of the type of play mode, the direction lever 54 is moved from the position in the play mode up to that point. can be moved to the position in the play mode,
Therefore, the structure of the cam means for controlling the position of the detection lever 99 is extremely simple, and there is no risk of malfunction.

Note that such automatic switching of the tape running direction is not performed in the high speed running mode. That is, in this mode, the gear ratio switching gear 81 is in the speed increasing position, and the small gear 85 is
is engaged with the large gear 15 of the cam gear 14, so when the tape end is reached, the cam gear 140 is also prevented from rotating. Therefore, even if the tape end is reached when the detection lever 99 is at the intermediate position, This is because the detection lever 99 is never moved to the operating position because the scooping cam 98 stops when it is separated from the scooped projection 106.

(k, shutoff) [Fig. 1, Fig. 2, Fig. 4, Fig. 2
The reference numeral 112 in Fig. 0 is a shut-off lever for automatically canceling the play mode, and includes a cylindrical boss portion 113 and a knob portion 114 protruding approximately forward from the boss portion 113. , a flexible part 115 extending from the boss part 113 and bent to form a substantially flat S-shape when viewed from above, and an insertion arm 116 continuous to the tip of the flexible part 115 are integrally formed. , a boss portion 113 is rotatably supported on the lower surface of the left end of the front end portion of the mechanical chassis 2.

Reference numeral 117 is a pressed projection that is vertically provided at the left end of the lower surface of the lock lever 34.

Therefore, when shutting off, as shown in FIG.
17 and the pressing pin 91 of the rotating lever 89 to the insertion position.

Therefore, when the tape end is reached from the reverse play mode in which the shutoff lever 112 is in the above position, the press pin 91 of the rotation lever 89 presses the rear end of the insertion arm 116 to the left, The intermediate portion of the inserting arm 116 presses the pressed protrusion 117 of the lock lever 34 to the left, thereby moving the lock lever 34 in the unlocking direction and locking the head base 21 that has come to the play position. is canceled. This state is shown in FIG. 20(B), and the head base 21 is attached to the lock lever 34.
When the lock is released, it is returned to the stop position. As a result, the play mode is canceled and the direction lever 54 is moved to the normal position.

Note that when the tape end is reached from the normal play mode, the rotating lever 89 is rotated counterclockwise, so the pressing bottle 91 does not press the insertion arm 116 to the left at this time. Therefore, shut off lever 112
Even if the lock lever 34 is at the insertion position, the lock lever 34 will not be moved in the unlocking direction.

That is, shutoff is performed only when the tape end is reached from the reverse play mode.

(G. Effects of the Invention) As is clear from the above description, the reel stand drive mechanism of the tape player of the present invention has an input gear that transmits the rotation of the drive system to the reel stand, and two large and small wheels located coaxially. a drive gear having two gears, and a first gear having two large and small gears located on the same axis, one of the two gears meshing with the input gear, and the large gear meshing with the small gear of the drive gear. and a second position where the small gear meshes with the large gear of the drive gear, and is supported so as to be freely displaceable in the axial direction, and is subjected to a force of movement to one of the two positions by an elastic means. and a gear ratio switching gear which is energized, the gear ratio switching gear is moved to the first position when forming the play mode, and the gear ratio switching gear is moved to the first position when forming the high speed running mode in which the tape is run at high speed. The present invention is characterized in that the ratio switching gear is moved to the second position.

Therefore, in the reel stand drive mechanism of the tape player of the present invention, when the play mode is established, the rotation of the drive gear is decelerated by the large gear of the gear ratio switching gear meshing with the small gear of the drive gear. When the high-speed running mode is established, the small gear of the gear ratio switching gear meshes with the large gear of the drive gear, increasing the rotation speed of the drive gear and transmitting it to the reel stand. Therefore, gear ratio switching gear 1
The rotation speed of the reel stand can be selectively switched by simply changing the position of the reel. This allows only one gear to transmit the rotation of the drive system to the reel stand by selectively changing the gear ratio. The number of parts and the number of assembly steps can be significantly reduced, and the overall size can be reduced.

In the above embodiment, the present invention is applied to a tape player in which various modes are formed by pushing a predetermined mode forming lever, and the gear ratio switching gear is a lever for forming a fast forward mode or a lever for forming a rewind mode. When the forming levers are pushed in, they are pushed in the axial direction and moved to the second position, and at other times they are held in the first position by the resilient means. By doing so, there is no need to provide special means for switching the position of the gear ratio switching gear in the axial direction.

Further, in the above embodiment, one gear ratio switching gear is supported on a gear support shaft provided on a rotatable rocking lever, and depending on the selected mode, the gear ratio switching gear is moved from one side to the other. 8 is moved to a position where it meshes with the input gear of the reel stand or a position where it meshes with the input gear of the other reel stand. By doing this, it is possible to selectively rotate one of the two reel stands. Since this and selective switching of the rotational speed can be performed using only one swing lever and one gear ratio switching gear, the structure of the reel stand drive mechanism can be further simplified.

However, when carrying out the present invention, two gear ratio switching gears are provided, one for each of the two reel stands, and each gear ratio switching gear is configured to rotate only the reel stand and switch its rotational speed. It is also possible to have them take charge of this.

Further, in the above embodiment, the large gear of the gear ratio switching gear is meshed with the input gear of the reel stand, but in some cases, the small gear of the gear ratio switching gear may be meshed with the input gear of the reel stand. Also good.

[Brief explanation of drawings]

1 to 20 show an example of the implementation of the reel stand drive mechanism of the tape player of the present invention. FIG. 1 is a plan view of the entire tape player, and FIG. 2 shows the mechanism below the mechanical chassis. 3 is an exploded perspective view of the mechanism above the mechanical chassis, FIG. 4 is an exploded perspective view of the mechanism below the mechanical chassis, FIG. 5 is an exploded perspective view of the cam gear, and FIG. 6 is an exploded perspective view of the mechanism above the mechanical chassis. is an exploded perspective view of the gear ratio switching gear and swing lever, FIG. 7 is a sectional view taken along the line ■-■ in FIG. 1 and shows only the essential parts, and FIG. 8 is a cross-sectional view taken along the line FIG. 9 is an enlarged sectional view taken along the line showing only the main parts, and is an enlarged cross-sectional view taken along the [X
- An enlarged sectional view taken along line IX and showing only the main parts, FIG. 10 is a plan view of the main parts in normal play mode,
Figure 11 is a plan view of the main parts in reverse play mode, Figure 12 is a bottom view of the main parts in fast forward mode, and Figure 13 is a bottom view of the main parts in reverse play mode.
The figure is a bottom view of the main parts in rewind mode, Figure 14 (A)
14(B) is a plan view showing the main parts when the pinch roller is in contact with the capstan when the pinch roller lever is in the normal position, and Figure 14 (B) is from the state in which the pinch roller lever is in the reverse position. A plan view showing the main parts when the pinch roller comes into contact with the capstan, Fig. 15 is an enlarged side view of the main parts when the lever for high-speed running mode is pushed in, and Fig. 16 shows the Xli+ shown in Fig. 1. Figure 17 is an enlarged sectional view taken along line - horizontal section,
Figure 18 shows the movement of the auto-reverse mechanism from (A) to (B) when the tape ends from normal play mode.
) is a horizontal sectional view of the main part shown over time from (A) to (B), and Fig. 19 is a horizontal cross-sectional view of the main part showing the movement of the auto-reverse mechanism from (A) to (B) over time when the tape end is reached from reverse play mode. Cross-sectional view, FIG. 20 is a horizontal cross-sectional view of the main part showing the auto-shutoff operation from (A) to (B) over time;
FIG. 21 is a horizontal sectional view showing an example of a conventional reel stand drive mechanism. Explanation of symbols 1...Tape player, 5...7, 97'...10. 14 ・ 15 ・ 17 ・ 71 ・ 81 ・ 82 ・ 85 ・ 87 ・ Reel stand, 5'... Reel stand, ・Input gear, ・Input gear, 1.12.13... Drive system, ・Drive gear , - Large gear (of the driving gear), - Small gear (of the driving gear), - Reel stand drive mechanism, - Gear ratio switching gear, - Large gear (of the gear ratio switching gear), - (of the gear ratio switching gear). Small gear, ・Bulging means 14...Drive gear 15...Large gear 17 (of the drive gear)...Small gear (of the drive gear) Exploded perspective view of the cam gear Figure 5; Q &

Claims (1)

[Claims] An input gear that transmits the rotation of a drive system to a reel stand, a drive gear that has two large and small gears located on the same axis, and a drive gear that has two large and small gears that are located on the same axis, and Either one of the two gears is meshed with the input gear, a first position where the large gear meshes with the small gear of the drive gear, and a second position where the small gear meshes with the large gear of the drive gear. and a gear ratio switching gear that is supported so as to be freely displaceable in the axial direction so as to move between the two positions, and is biased with a force of movement toward one of the two positions by an elastic means. A tape characterized in that the gear ratio switching gear is moved to a first position, and the gear ratio switching gear is moved to a second position when forming a high-speed running mode in which the tape is run at high speed. Player reel drive mechanism