JPS63100651A - Press-contact mechanism for pinch roller - Google Patents

Abstract

PURPOSE:To reduce load when a head base retreats by providing a spring which achieves its spring force when a magnetic head moves and becomes close to a tape travel position, energizes holding members and resiliently abuts pinch rollers on capstans. CONSTITUTION:One end of a torsion spring 171a abuts on a linkage part 700a and the other abuts on a locking piece 163a provided on the fitting part 163 of the head base 150. Another holding member 167b has a similar structure and corresponding parts are denoted by suffixes (b). Since, both ends of press- contact torsion springs 171a and 171b bringing the pinch rollers 166a and 166b into the capstans 174 and 175 with pressure are linked to the holding members 167a and 167b, the pinch rollers 166a and 166b can be brought into contact with the capstans 174 and 175 by pressing the ends of the springs 171a and 171b. Besides to that, the head base 169 can retreat without loads of the springs 171a and 171b.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a pinch roller crimping mechanism for a magnetic tape recording/reproducing device.

BACKGROUND ART A typical prior art is shown in Figure MS32. The head stand 301 to which the magnetic head 300 is attached has springs 302,
It is spring-biased in the forward direction 304 by the spring force of 303 . The pinch roller 305 is supported by a support piece 306, and a torsion spring 307 for pressing the pinch roller is attached to the pongee 308 of the support piece 306. One end of this torsion spring 307 abuts the support piece 306, and the other end is fixed at a fixed position. With this structure, the pinch roller 305 is always biased counterclockwise in FIG. 32 by the spring 308. When the head body 301 moves forward, the pinch roller 305 is pressed against the capstan via the magnetic tape by the spring force of the spring 307. However, when the head stand retreats, the pinch roller 305 is pushed back by the head stand 301 against the spring force of the spring 307 by a drive mechanism (not shown).

Problems to be Solved by the Invention In the above-mentioned prior art, when the head stand moves backward, the spring 30
2.303 spring force and pinch roller crimping spring 30
A drive mechanism (not shown) must be driven against the spring force of 7. Therefore, a large load is generated.

An object of the present invention is to provide a pinch roller crimping mechanism that solves the above-mentioned technical problems and can reduce the load as much as possible when the head table is retracted.

Means for Solving the Unlucky Point The present invention provides a head stand 160 on which the magnetic head 162 is fixed, and a head stand 160 for moving the magnetic head 162 to a magnetic tape running position and moving it toward and away from the magnetic tape running position. The first springs 187 and 188 are spring-loaded in the direction where 162 approaches the running position of the magnetic tape, the capstan 1741175 is provided at a fixed position, and the pinch rollers 16Ga and 1GOL+ that are pressed against the capstan 1741175 are rotatable. Holding member 1 held in
67a, 167b, the pinch rollers 166a, 1
Such a holding member 167a, 1 is supported in a fixed position for angular displacement about an axis parallel to the axis of 6f3b.
67b, is interposed between the holding members 167a, 167b, and the head stand 160, and when the magnetic head 162 moves close to the tape running position, exerts a spring force to move the holding members 167a, 16
7b to resiliently abut the pinch rollers 166a, 166b against the capstan 1741175.

According to the present invention, the second springs 171a, 17 interposed between the holding members 167a, 1f37b and the head stand 160
1b exerts a spring force only when the magnetic tape moves close to the tape running position. This 1 means the holding member 1
67a, 167b are biased by the spring force of second springs 171a, 171b, and the pinch rollers IG f3a, 1
66b springs into contact with the capstans 174 and 175. Therefore, when the head stand 160 is moved away from the tape running position, the second springs 171a and 171b do not exert any spring force, thereby reducing the load when the head stand 160 is moved away from the tape running position (backward). be able to.

Embodiment FIG. 1 shows a magnetic tape recording/reproduction device T according to an embodiment of the present invention.
110, FIG. 1'52 is its front view, FIG. 3 is its rear view, FIG. 4 is its right side view, and FIG. 5 is its left side view, FIG. 6 is a rear view thereof. Referring to these drawings, magnetic tape recording/
A magnetic tape cassette 13 is mounted on the left and right side walls 11a, llb of the chassis of the playback device (hereinafter referred to as tape deck) 10.
Holders 14a and 14b are provided for holding the holder so as to be movable up and down.

Insert the magnetic tape cassette (13) into the holders 14a, 14b horizontally and the magnetic stave in the insertion direction A11l.

A gripping means 16 for gripping the magnetic tape 13 is provided above the bottom wall 15 of the chassis (on the near side of the paper in FIG. 1). This gripping means 16 includes gripping members 16a, 16
It has b. This gripping member 16a=16b is the driving member 1
r! in a plane supported by t7 and including the upper surface of the magnetic tape cassette) 13! ! It can be driven up to 1m. This drive member 17 is movable along guide rails 18a and 18b formed on the left and right a walls 11a and flb of the chassis in the insertion direction A1 and the ejection direction A2.

A moving member 124 that is movable along the moving direction F (left-right direction in FIG. 1) is disposed on the loading frame 19.
This moving member 124 is combined with an operating lever 21 . The loading frame 19 is formed with a guide slot 22 extending along the insertion direction A1 of the magnetic tape deck 3. As will be described later, the drive member 17 is displaced along the guide slot 22, so that the magnetic tape cassette 13 can also be moved via the gripping means 1G between the extreme tape insertion position and the tape ejection position.

FIG. 16A is a simplified diagram of the drive system of the tape deck 10. Referring also to FIGS. 1 to 6, a motor 23 is provided on the bottom wall 15 of the chassis. This motor 23
A pulley 24 is fixed to the output shaft of. An endless belt 26 is wound around the pulley 24 and the right flywheel 25a. This belt is 261 and the fly foil is 2.
5b are in contact with each other, and the flywheels 25a and 25b are thereby driven by the motor 23 to rotate in the direction of the arrow in FIG. 6A. The flywheel 25m is marked 0/
A re-soil tooth post 27 is fixed coaxially. This recording/reproduction gear 27 meshes with teeth $28.29, the gear 28 meshes with teeth $30, and this gear 30 coaxially has teeth frt31.
is fixed. The gear 32 meshes with the teeth 1131, and this t! A drive gear 33 is coaxially fixed to the first wheel 32.

A performance/fast forward switching tooth 11135 is interposed between the tooth 11129 and a fast forward gear 1134 coaxially fixed to the flywheel 2Sb, and this switching gear 35 is connected to an electromagnet 36 (sixth (see figure), the rapid-forwarding gear 3 is driven by the drives r11t and t, which will be described later.
When the electromagnet 36 is in the OFF state, the switching tooth 1$135 meshes with the two gears.

The gear 35 meshes with the gear 37, and this gear 37 meshes with the gear 38.
This tooth meshes with the bottom of the chassis for $38! ! ! An idler gear 39 is fixed coaxially at a position above 15. The tooth IL38 and the idler tooth J'1139 mesh with either a gear 40a or a gear 41 coaxially fixed to the pivot of the left take-up reel 40 by a tape running switching mechanism to be described later. A gear 42 coaxially fixed to the pivot of the take-up reel 42
When the idler tooth #139 meshes with the gear 41, the right take-up reel 42 is driven to rotate in the direction of the arrow, and the idler tooth #139 is disengaged from the gear 41. When engaged with E1140a, the left take-up reel 40 is rotationally driven.

Said gear 29 also meshes with tooth I[43, which tooth $43
A drive gear 44 is fixed coaxially to the. This drive gear 4
4 meshes with the forward and backward notch teeth $45 of the head stand.

FIG. 7 is an exploded perspective view of the gripping members 16a, 16b and related parts, and FIG. 8 is an exploded perspective view of the gripping members 16a, 16b and parts related thereto.
6b is a simplified plan view of the vicinity; FIG.

The gripping member 16a includes a straight portion 50 and a bent portion 51, and extends in the insertion direction A1 of the magnetic tape cassette 13 in the bent portion 51, and has the other gripping member 16+ at the upstream end.
A holding pawl 52 is formed that extends in the proximal direction of o. The upstream end surface of the holding claw 52 in the insertion direction A1 is a guide surface 5 for guiding the protrusion 1!1s13a of the magnetic tape cassette 13.
3, and the downstream end surface of the holding claw 52 in the insertion direction A1 forms a retaining surface 54 that engages with and holds the protrusion 13a of the magnetic tape cassette 13. Insertion direction A1 of the bent 11 portion 51
A post 55 having a shaft hole is formed at the downstream end.

Further, the straight portion 50 of the gripping member 16a is provided with a locking 7tsuku 56.
is formed, and a tension spring 57 is connected to this locking hook 56. Also, in this straight portion 50, there is a
A guide shaft 58 is formed.

The other gripping member 16b also has the same configuration as the gripping member 16a, and corresponding parts are indicated with a subscript.

The drive member 17 includes a flat base n60 and guide pieces 61 and 62 provided at both ends of the base 60 in the width direction.
Guide grooves 63 and 64 into which the idle rails 18a and 18b fit are formed in the guide pieces 61 and 62. base 1!1s60
A gripping member 16a is provided on the front side of the .

A stepped surface 6S is formed so that the tension spring 57 does not come into contact with the upper surface of the base 60 when the IGb is inserted on the drive member 17 along the insertion direction A1. A notched edge 66 is formed continuous with this U rhombus surface 65.

Further, on the front surface 60& of this base portion 60, locking pieces 67 and 68 are formed which hang down near both ends in the width direction.

The base 60 also has cutouts 69,70 formed therein.

This notch 69 forms a support surface 71 parallel to the upper surface of the base 60.
and a circular arc surface 72 that is perpendicular to the support surface 71. Similarly to the notch 69, the other notch 70 is defined by a support surface 73 and a circular arc surface 74. A pivot shaft 75 is erected on this support surface 71 and is inserted through the insertion hole of the post 55 . Yet another support surface 73
A pivot shaft 76 is erected to pass through the insertion hole of the post 55b.

The base 60 is also formed with guide slots 77,78. The guide holes 77, 78 have the gripping members 16a, 16
The guide shaft 58.58b of b is inserted, and the gripping member 16a+1
6b is displaced along the guide slots 77 and 78 as the magnetic tape cassette 13 is inserted/ejected. A guide shaft 79 is provided upright on the rear side of the base 60. Further, a guide shaft 80 extending downward is formed on the lower surface of the end of the base portion 60 . This guide ring 80 fits into the guide slot 22 of the loading frame 19.

The actuating lever 21 includes a base 81 and a post 82 fixed to the lower surface of the base 81. The base 81 has a guide piece 8.
3 is formed, and a guide hole 84 is formed in this guide piece 83. A guide hole 85 is also formed in the base 81 into which the guide shaft 79 fits. This guide hole 85 is composed of a straight portion 85a extending in the longitudinal direction of the base g81, an inclined portion 85b bent and rotating toward the insertion direction Altll, and a lock portion 85c. One end of a torsion spring 88 is connected to the base 81, and the other end of this torsion spring 88 is fixed to the loading frame 19.

A pressing surface 89 is formed on the base 81, and the pressing surface 89 can press the seventh cutter 90 of the limit switch SWI as described later.

Next, the mounting conditions of the gripping members 16a, 16b, the driving member 17, and the operating lever 21 will be explained.

The guide shafts 58, 58b of the gripping members 16a*16b fit into the guide elongated holes 77, 78 of the drive member 17, and the insertion holes of the posts 55, 55b of the gripping members 16a, 16b fit into the pivot shafts 75 of each drive member 17. .7 (3). As a result, the gripping members 16a and 16b are biased toward each other around the pivot shafts 75 and 713 by the spring force of the spring 57.Thereby, the magnetic tape cassette 1
3 is inserted, the protrusion n13a is held by the claw 52.
52b, it can be held securely.

Fig. 9 is a sectional view taken from the section line 11-[ of Fig. t38, Fig. 10 is a sectional view taken from the section line XX of Fig. 8, and Fig. 11 is a sectional view taken from the section line XX of Fig. ttS8. It is a sectional view seen from cut plane ann. Engagement pins 91a and 91b protruding outward are formed on the holders 14a and 14b, respectively. These retaining pins 91a and 91b are connected to the tfA of the chassis.
Guide slots 11m3 formed in walls 11a, 1lb
．． 11b3 (see Figures 4 and 5);
The magnetic tape cassette 13 is placed horizontally in the holder 14a.
, 14b from the front side in the insertion direction A1.

Referring to FIG. 10, the drive member 17 has guide pieces 61, 62
The guide shaft 80 is supported by the idle rails 18a and 18b, and is supported by a retaining ring 9°3 that is locked to the lower end of the guide shaft 80. In this way, since the drive member 17 is supported by the chassis at three points, the insertion/ejection operation of the drive member 13 is smooth without wobbling due to vibration etc. can be done.

Furthermore, even if an undesired force is applied when inserting/ejecting the magnetic tape cassette 13, the drive member 17 will not be angularly displaced within a plane including the idle rails 18a, 18b, thus ensuring smooth insertion/ejection. can perform actions.

Further, as shown in FIG. 11, the guide shaft S8b and the post 55
Therefore, when the main portion 13m presses the guide surface 53° 53b of the holding claw 52.52b when inserting the magnetic tape cassette 13,
Even if a force is applied in the direction indicated by arrow 94 in Fig. tS11, the gripping members 16a, 16b can maintain a tilted (or horizontal) state.

Therefore, the protrusion 13a of the magnetic tape cassette 13 can be reliably held by the holding claws 52, 52b.

FIG. 12 is a diagram for explaining the operation of the gripping members IGa, 16b when inserting/ejecting the magnetic tape cassette 13. The magnetic tape cassette 13 is inserted horizontally into the holders 14a, 14b from the front side. At this time, the gripping members 16a and 16b are in the state shown in FIG. 8 in which the holding claws 52 and 52b are close to each other due to the spring force of the spring 57. Manually insert the magnetic tape (magnetic tape force set) 13 in the direction A1.
As a result, the protrusion g13a of the magnetic tape cassette 13 comes into contact with the guide surface 53 as shown in FIG. 12(1). In this state, the magnetic tape cassette 13 is further pushed in (and the gripping members 16a,
16b is pushed and expanded in the direction shown by arrow 95 in FIG. 12(1) within a plane including the upper surface of the magnetic tape cassette 13 against the spring force of the spring 57, and is expanded in the insertion direction A1 of the text part 13a.
After the downstream ends of the magnetic tape cassette 13 pass the top of the holding claws 52.52b, they are closed by the retaining surfaces 54.54b by the spring force of the spring 57, and the downstream end surfaces of the magnetic tape cassette 13 in the insertion direction A1 are connected to the driving member. 17 locking piece G7. GO(
(see FIG. 7), and the magnetic tape cassette 13 is tightly gripped by the engaging surfaces 54, 54b as shown in FIG. 12(2). In this way, the gripping members 16a, 16
b is configured to be openable and closable along the upper surface of the magnetic tape cassette 13, and holds the protrusion 13a of the magnetic tape cassette 13 by holding claws 52, 52b, as shown in FIG.
Since the upper surfaces of the gripping members IGa and 16b are held lower than the upper surface of the tape deck 3a, the tape deck can be made thinner.

Next, the magnetic tape cassette 1 shown in FIG. 12 (2)
When the operator further pushes in the magnetic tape cassette 13 slightly while it is being held by the gripping members 16a and 1f3b of FIG. The drive member 17 is pushed in the insertion direction A1 by the action of the actuation lever 21, that is, the drive member 17 is moved in the insertion direction A1 via the guide shaft 79 by the clockwise angular displacement of the actuation lever 21 in ttS12 diagram (2). and reaches the extreme end position ra in the insertion direction. When the magnetic tape cassette 13 reaches the extreme position in the insertion direction, the pressing surface 89 of the actuating lever 21 presses the 7 actuator 90 of the limit switch SW1. As a result, the limit switch SWI becomes conductive, and the motor 23 is energized.

By energizing the motor 23, the holders 14a and 14b begin to move downward, as will be described later.

When ejecting the magnetic tape cassette 13, an eject button (not shown) is operated, and the electromagnetic plant cassette 10 is thereby ejected.
2 (see FIG. 15) becomes conductive, and the electromagnetic plunger 102
The drive shaft 102m (see FIG. 15) retracts. This allows the upper notch i-+11103 (see FIG. 15) to be softened. Therefore, the holders 14a*14b are raised by the elevating mechanism from the position where the loading of the magnetic tape force set F is completed, and reach the end position where the magnetic tape is loaded. This upward movement of the holders 14a+14b causes the shaft 138(
7 and vJ15) is displaced from the straight portion 85m of the guide hole 85 of the actuating lever 21 to the inclined portion 85b,
As a result, the operating lever 21 begins to be angularly displaced around the axis of the boss 82 in the direction of arrow G (see FIG. 7).

As a result, the driving member 17 and the gripping member 16a.

16b begins to move toward the discharge direction A2. Tsumugi 138
When they move to the lock portion 85c of the guide hole 85, the drive member 17 and the gripping members 16a, 16b reach the ejection direction completion position 2. It should be noted that at the end of the ejection completion position, the magnetic tape cassette 13 is held by the gripping members 16a and 1f3b, and therefore the magnetic tape cassette 13 is prevented from flying out from the ejection port due to the ejection operation. After that, the fabricator put magnetic tape cassette 13 in front II.
! II (discharge direction), thereby removing the protrusion 13a.
The retaining claws 52 and 52b that are embedded in t-a are shown in Figure MS12 (
2), the magnetic tape cassette 13 is released from being held by the gripping members 16a and 16b.

In this way, the gripping members 16a and 16b can be freely opened and closed along the upper surface of the magnetic tape cassette 13, and the opening and closing operations of the holding claws 52 and 52b of the gripping members 16a and 16b allow the magnetic tape to be applied to the text 13a of the magnetic tape cassette 13. hold,
Since the tape deck 10 is moved for insertion/ejection, it is possible to make the tape deck 10 thinner. Further, the driving member 17, the guide piece G1. G2 and the guide shaft 80, and the driving member 17 is supported by the γ idle rail 18a,
18b and the guide slot 22, angular displacement in a plane including the insertion direction of the drive member 17 is prevented, and further angular displacement around an axis parallel to the insertion direction is prevented. This makes it possible to perform extremely smooth insertion/ejection operations. Further, by providing the locking pieces G1 and 6B as the contact surface of the magnetic tape cassette 13 of the drive member 17, the contact area can be reduced, and the warpage or deformation of the drive member 17 and the impact of the magnetic tape cassette 13 can be reduced. The influence of force can be further reduced. Furthermore, since the holding claws 52, 52b are opened and closed by the spring force of one spring 57, the number of parts can be reduced.

Fig. fjS14 is a plan view of the elevator unit 13 of the magnetic tape assembly 13, and Figs. 15 and 16 are exploded perspective views of the elevator unit 1 and related thereto. Bottom of the chassis! !
! 15, a pongee 110 is erected.

A lower notched tIII wheel 103 and a lower notched gear 104 are rotatably supported on this pongee 110. This lower notch Qi
1iii In the IL 104, cutouts 104a and 104b are formed at intervals of 180° in the circumferential direction. The lower notched gear 104 has upwardly protruding protrusions 104c and 1 on its peripheral edge.
04d is erected. Further, in the center part of the lower notched gear 104, there is a protrusion 104e having an insertion hole through which the pongee 110 is inserted.
will be erected. This protrusion 104e has a circle of 19104ff
, a drive n104g protruding outward in the radial direction at 180° intervals on the outer peripheral surface of the cylindrical portion 104f, 104
h.

One end of a torsion spring 111 is in contact with either the projection 104c or the projection 104d, and the other end of this screw spring 111 is in contact with an end surface 123k of the blocking member 123, and the shaft portion 1
11a is a post 123bl: fitted and fixed. A semicircular arc-shaped cam 104k is formed on the lower surface of the lower notched gear 104, as shown in FIG. 15A.

The lower notch gear 103 has a notch 103a! ! Led. A cam 112 is provided on the upper surface of this lower notched gear 103.
is fixed. The cam surface 112a of this cam 112 has a tPJ1 cam surface 113 that extends linearly, and a lower notch tooth 1!
An arcuate second cam surface 114 continuous to the IIIQ portion, and a first
A substantially S-shaped third cam surface 115 is provided between the cam surface 113 and the second cam surface 114. The second cam surface 114 has a minimum diameter R1 with respect to the ISR pongee hole shaft hole 6 that is connected to the first cam surface 113, and the diameter gradually increases as it goes in the opposite direction of the rotation direction Y, and the diameter increases to the fl's3 cam surface 115. It is curved into a circular arc shape with a maximum diameter R2 at the continuous ends.

The vicinity of the minimum diameter of the second cam surface 114 faces the notch 103al. One end of a torsion spring 117 comes into contact with the cam surfaces 113, 114° 115.

The shaft portion 117a of this torsion spring 117 is connected to the movable member 118.
The other end of the torsion spring 117 is fixed to the chassis. Therefore, the lower notched gear 103
is spring-loaded in the rotational direction Y by a screw spring 117.

A post 118b having an insertion hole coaxial with the protrusion 118a is formed on the lower surface of the movable member 118. This post 1
18b, the pivot shaft 119 is fitted into the chassis, and the movable member 118 is thereby
can be angularly displaced around the axis of The movable member 118 has an end portion on the reflection side where the protrusion 118a is located, and the head stand 16
A locking recess 118c is formed that can be locked to a locking pin 120 that is erected at 0 (see FIG. 21). In addition, the movable member 118 has a protrusion 104e of lower notch teeth +11104.
, 104d.

Further, this movable member 118 is formed with a locking protrusion 118e that comes into contact with a locking surface 500tJ (see FIG. 17) formed on the lower surface of the lower notched gear 103.

One end of a screw spring 121 is connected to this movable member 118, the shaft portion 121a of this torsion spring 121 is fitted into the post 118b, and the other end of the torsion spring 121 is fixed to the chassis. As a result, the movable member 118 is biased in the direction of arrow C by the spring force of the torsion spring 121.

A cam 500 coaxial with the shaft hole 116 is formed on the lower surface of the upper notched gear 103, as shown in FIG.
00 is an arcuate cam surface 500a which is partially cut out and whose diameter gradually increases toward the downstream side in the rotational direction Y;
a planar locking surface 500b extending radially outward;
500c, a locking surface 500b, and a driving piece 12 of the blocking member 123 which is formed at 1:180° intervals in the circumferential direction and prevents rotation of the upper notched gear 103.
It comes into contact with the locking surface 123m1 of 3a. During performance, the movable member 118 engages the locking surface 5 of the cam 500 of the upper notched gear 103.
00d, thereby preventing the upper notch gear 103 from rotating. In addition, in this condition, the lower notch I
The J wheel 104 does not mesh with the driving gear 33, and therefore the upper notched gear 103 does not rotate.However, when the electromagnetic plunger 102 is erroneously excited, the blocking member 123 is angularly displaced, as will be described later. to release the rotation prevention of the upper notch tooth Itl103. Therefore, if the rotation of the upper notch gear 103 is not stopped by the locking protrusion 118e of the movable member 118, the upper notch gear 103 will rotate by mistake, and this will cause the upward movement f of the magnetic tape cassette 13. This prevents such a situation in which the magnetic head or the like is damaged due to the initial failure.

A boss 123b is provided upright on the blocking member 123. The shaft portion 111a of the torsion spring 111 is mounted on the boss 123b. A pongee (not shown) that stands upright on the chassis is inserted into the insertion hole of the boss 123b, so that the blocking member 123 can be angularly displaced around the axis. The blocking member 123 is formed with an insertion hole 123c through which the drive tooth JTt33 is inserted. Further, guide projections 123h and 123i are provided upright on the blocking member 123. This prevents the lexical board 681 that electrically connects the magnetic head 162 and the printed circuit board 680 from coming into contact with the blocking member 123 and other displaced or rotating members. Further, this blocking member 123 is formed with a hanging portion 123d. This hanging portion 123d has a locking groove 123.
e is formed. A retaining portion 1 is formed in the locking groove 123e at the end of the drive shaft 102m of the electromagnetic plant gear 102.
02b is fitted into the electromagnetic plant gear 102, which is excited.
When the drive shaft 102a retracts, the blocking member 123 is slightly angularly displaced in the direction opposite to the direction of arrow D (see FIG. 15), and the spring force of the spring 117 causes the notch gear 103 to mesh with the drive tooth rrL33. . After this electromagnetic plantsuya 10
2 is demagnetized, and the blocking member 1 is demagnetized by the spring force of the spring 111.
23 returns to the predetermined position.

A loading frame 19 is arranged above the upper notch gear 103, the blocking member 123, and the like. A moving member 124 that can be displaced in a direction FI perpendicular to the insertion direction A1 of the magnetic tape cassette 13 is mounted on the loading frame 19.

One end of a tension spring 125 is connected to the moving member 124, and the other end of this tension spring 125 is connected to the loading frame 19.
It is connected to the lock 7 hook 126 of.

As a result, the moving member 124 is spring-biased in the direction of arrow F1. The moving member 124 is formed with guide elongated holes 127, 128, and 129 extending along the moving direction F1. A guide protrusion 130 erected on the loading pedestal 19 is fitted into the guide elongated hole 127, a guide protrusion 131 erected on the loading pedestal 19 is fitted into the guide elongated hole 128,
A guide protrusion 132 erected on the loading frame 19 is fitted into the elongated guide hole 129, and a guide hole 135 is fitted into the moving member 124, into which a drive protrusion 133b erected on the drive piece 133a of the drive member 133 is fitted. is formed. This guide hole 135 extends in the insertion direction A1 of the magnetic tape cassette. The moving member 124 also has a portion 136a that is formed roughly in an L-shape and extends along the moving direction F1.
A guide hole 136 is formed having a portion 136b extending perpendicularly to this portion 136a. This guide hole 136
The drive protrusion 137a of the drive member 137 fits into the.

At the right end of the moving member 124 in FIG.
8 will be erected.

This pongee 138 fits into the guide hole 85 of the operating lever 21.

A shaft hole 139 is formed in the loading frame 19, and a pivot shaft 133c of the drive member 133 fits into this shaft hole 139. 1811 The drive protrusion 1 of the member 133
A follower 133d that protrudes so as to come into contact with the cam surfaces 113, 114, and 115 of the upper notch gear 103 is fixed to the surface opposite to 33b. This holo 7133d
fits neatly into the curved guide hole 142 of the loading frame 19 and comes into contact with the cam surfaces 113, 114, 115 of the cam 112 arranged below the loading frame 19. By the rotation of the upper notched gear 103 in the Y direction, the holo 7133d moves from the end P1 to the ya part P of the second cam surface 114.
2 is in contact with the follower 1, which is the ejection operation period, and the follower 1
33d is in contact with the Pt53 force surface 115 from the end P2 during the insertion operation period, and while in contact with the first cam surface 113 it is the falling operation period. A limit switch SWI is attached to the loading frame 19,
In the vicinity of the cutter 90 of this limit switch SWI, there is an insertion hole 14 through which the protrusion 123r of the blocking member 123 is inserted.
3 is formed. Further, a guide groove 600 into which the protrusion 137a of the drive member 137 fits is formed.

Further, a pongee 900 is erected on the loading frame 19, and the pongee 900 is inserted through the insertion hole of the boss 82 of the operating lever 21. This allows the operating lever 21 to be angularly displaced around the pongee 900.

Note that the actuating lever 21 is connected to the torsion spring 88 as described above.
The pongee 900 is biased clockwise in FIG. 15 by the pongee 900.

When the upper notch gear 103 is rotationally driven by the drive tooth 1133, the holo 7133d is guided by the second cam surface 114 of the cam 112 and rotates around the ring line of the pivot shaft 133C.
Angular displacement in the counterclockwise direction in the figure.

As a result, the moving member 124 is displaced in a direction opposite to the moving direction F1. Further, when the follower 133dIJftjS3 reaches the first cam surface 113 from the cam surface 115, the moving member 124 is moved in the moving direction F1 by the spring force of the spring 125.
displacement along.

Referring to FIG. 16, longitudinal members 144a and 144b are attached to the outer sides of I-walls 11a and 11b of the chassis. The longitudinal member 144a is connected to a moving member 146 via a connecting piece 145 in the form of a tint.

Further, the other longitudinal member 144b is a fan-shaped connecting piece 1.
It is connected to the moving member 146 via 47.

The connecting piece 145 can be angularly displaced around the pongee 145a, and the other connecting piece 147 can be angularly displaced around the pongee 147a. A guide hole 149 is formed in the longitudinal member 144b, through which the projection 148a of the lifting lever 148 is inserted. This guide hole 149 is formed to extend in a direction perpendicular to the longitudinal direction of the longitudinal member 144b. Further, a guide hole 150 extending in the longitudinal direction is formed in this parishioner member 144b, and this guide hole 150 has @! E! The protrusion 11b1 formed on llb is inserted gently. Such a configuration of the longitudinal member 144b is similar to that of the other parishioner member 144a.
The same applies to

A shaft hole 148c is formed in the lifting lever 148, and a sleeve 11b2 formed on the m-wall 11b fits into the shaft hole 148c, whereby the lifting lever 148 is angularly displaced around the ring 11b2. It is possible. l
l! ! ! Elevating guide holes 11b3 and 11b4 extending along the elevating direction E are formed in llb. The engagement pin 91b of the holder 14b is inserted through the guide hole 11b3 of the side wall 11b, and further through the guide hole 148b of the lifting lever 148. Further, the engagement pin 91b1 of the holder 14b is connected to the side wall 1.
1b through the guide hole 11b4. As a result, the holder 14b moves up and down along the ascending direction E1 or the descending direction E2 by the angular displacement of the lever 148 around the pongee 11b2.

The protrusion 11b1 of the I-wall 11b smoothly inserts into the guide hole 150 of the longitudinal member 144b. As the longitudinal member 144b is displaced in the insertion direction A1 or A2, the protrusion 148a of the lifting lever 148 is displaced, and the lifting lever 148
is angularly displaced around Tsumugi 11b2.

The various lifting levers 148 and related structures are also provided with similar holes on the longitudinal member 144ail.

Engagement holes 400 and 401 are formed at the ends of the longitudinal member 144b iml of the moving member 146. This retaining hole 40
A biasing member 15 having an engagement hole 152 at a position corresponding to 0
3 is supported by the movable member 146 by a pin 154 so as to be angularly displaceable. One end of a tension spring 155 is connected to one end of this biasing member 153.
! The end is connected to a locking pin 156 on the moving member 146. The drive protrusion 137b of the drive member 137 is connected to the engagement hole 152 of the biasing member 153 and the engagement hole 4 of the first moving member 146.
Insert 00. The angular displacement of the driving member 137 causes the moving member 146 to be displaced along the movement direction F1 or F2, thereby causing the longitudinal members 144 and 144b to move.
is placed in the insertion direction A1 or A2 direction. As the longitudinal members 144a, 144b are displaced, the lever 148 is angularly displaced, thereby causing the holders 14a, 14b to move up and down along the up and down direction.

FIG. 18 is a simplified diagram showing the elevating mechanism of the magnetic tape force 13. FIG. 18 shows a state in which the discharge is completed, and in this state, the upper notch gear 103 is connected to the blocking member 1.
23 prevents rotation. Also, the motor 23 is deenergized. Further, the drive protrusion 138 is connected to the actuation lever 2.
1, the operating lever 21 resists the spring force of the torsion spring 88,
It is stopped in this state shown in FIG. This condition also
As shown in Fig. mlaA (1), the follower 133d is spaced from the cam 112 by 1 m. The magnetic tape cassette 13 is inserted in the state shown in FIG. 18, the operating lever 21 is angularly displaced clockwise in FIG. 18 by the spring force of the torsion spring 8B. As a result, the magnetic tape cassette 13 reaches the terminal position in the insertion direction A1 together with the drive member 17, as shown in FIG. 19. In this state, the protrusion 137a of the drive member 137
is located in a portion 136 of the guide hole 136 of the moving member 124, and angular displacement of the driving member 137 is prevented.

In the state shown in FIG. 19, the operating lever 2
The pressing surface 89 (see Fig. 7) of No. 1 is the limit switch SW.
The motor 23 is energized to press the 7 actuator 9o of I. At the same time, the moving member 124 is slightly moved by the spring force of the spring 125 along the moving direction F1. As a result, as shown in FIG. 18A (2), the holo 7133d comes into contact with the cam surface 115 of the cam 112, and at the same time, the driving protrusion 137a of the driving member 137
24 is released from the portion 136a of the guide hole 136, and the rotation blocking state of the drive member 137 is released.

In such a state, as described above, the drive teeth are activated by the power energization of the motor 23! tE33 rotates, which causes the upper notch gear 103 to rotate, so that the holo 7133d
#f#3 is in contact with the force surface 115 (therefore, the moving member 124 is in contact with the upper notch cram gear 103 along the moving direction F1
It moves warmly as it rotates. Along with this, the driving member 137 undergoes an angular displacement, and is moved by the action of the driving protrusion 137b! ! ! ! 1 member 146 is displaced in the moving direction F2. Therefore, the longitudinal members 144a and 144b are inserted in the insertion direction A1.
In the wheat position, lever 148 is angularly displaced in the direction of arrow B (see FIG. 20B). As a result, as described above, the holder 14a+14b is descending in the F2 direction (the magnetic tape force is set when the moving member 124 reaches the end position in the moving direction F1), and the fall of the holder 13 is complete. The situation is shown in FIG. This completes loading of the magnetic tape cassette 13. In addition, in such a state where the fall is completed, the locking surface 123m1 of the blocking member 123 is in contact with the locking surface 500b of the cam 500, as shown in FIG. is locked7.

At the time of ejection, the electromagnetic plunger 102 is turned on, and thereby the blocking member 123 is angularly displaced and the upper notch 103
is unlocked. Therefore, the upper notch t! 1
The wheel 103 is rotationally driven, thereby causing the follower 133d to
is guided along the second cam surface 114, thereby displacing the moving member 124 in the moving direction F2. Along with this, the driving member 137 is angularly displaced in the counterclockwise direction in the m20 diagram.

Therefore, the moving member 146 moves along the moving direction F1, and as a result, the holders 14a and 14b rise. In the raised state, as shown in FIG. 19, the drive protrusion 137a of the drive member 137 fits into a portion 136al of the guide hole 136, thereby preventing the drive member 137 from rotating. Therefore, the rising operation becomes locked. On the other hand, the upper notched gear 103 further rotates, thereby further moving the follower 133d in the moving direction F2 from the insertion R end position in FIG. 19. Therefore, the actuating lever 21 is guided by the protrusion 138 inserted through the guide hole 85 of the actuating lever 21, and is angularly displaced against the spring force of the torsion spring 88. As a result, the drive member 17 moves in the discharge direction A2 and reaches the discharge completion position shown in FIG. 18. In the discharge completion state shown in FIG. 18, the blocking member 1
23 and the cam 500 are at the position shown in FIG. 18B (2)!
Therefore, the drive protrusion 123f of the blocking member 123 maintains the limit switch S W 1 in a conductive state. Therefore, the upper notched gear 103 continues to rotate further, and the blocking member 123 comes into contact with the locking surface 500e of the upper notched gear 103 as shown in FIG. 18B (3), so that the blocking member 123 is in the normal position ! After the angular displacement reaches 1, the pressing force of the 7 actuator 90 of the limit switch SWI is released. At the same time, the motor 23 stops. The ejection operation is thus completed.

In this way, the raising and lowering operation is performed by the action of the cam 112 of the upper notch tooth 41103 and the follower 133d when the motor 23 is driven, so that smooth raising and lowering operation can be achieved with quiet operation noise. . Further, although a plunger dedicated to lifting and lowering has conventionally been used, in this embodiment such a plunger is not used, and the number of parts can be reduced.

Moreover, the timing of the insertion operation, the insertion completion operation, and the dropping operation of the magnetic tape cassette 13 can be performed reliably with a simple mechanism.

Note that when the magnetic tape cassette 13 has been raised completely, the second
0 As shown in Fig. 0A, the drive protrusion 137b
The driving projection 137b is held between the contact surface 152a facing upstream in the moving direction F1 of the engagement hole 400 and the contact surface 400m facing downstream in the moving direction F1 of the engagement hole 400, and the driving protrusion 137b is moved in the moving direction F311m by the spring force of the spring 155. Because it is energized by
As shown in FIG. 20B, the retaining pins 91a and 91b are further urged in the upward direction E1 while in contact with the guide hole 11m3°11b3. Therefore, the holder 14a, 1
4b is reliably positioned in the height direction at the raised position. Further, since the spring 155 for applying this biasing force has no effect at all during the upward movement, the load during the upward movement is reduced.

Furthermore, in this embodiment, since the tension spring 125 serves both the function of sucking in the magnetic tape cassette 13 and the function of crimping the magnetic tape cassette 13, it is ensured that a stable state is maintained even when the tape deck 10 vibrates. be able to.

In the conventional technology for stabilizing the magnetic tape force 13 when the tape deck 10 vibrates, two springs are used, and the spring force of these springs locks the state even when ejection is completed. A force is acting in the direction E2 to lower the magnetic tape cassette 13 against the locking mechanism, which locks tj! [It will be a big load to release 1. This prior art problem can be solved by locking tn with one spring 125 and actuating lever 21.
This problem can be solved by providing bt to prevent spring force from acting on the holders 14a*14b when locked.

Figure 21 shows the head stand 160 and tape running switching fi.
22 is a plan view of the vicinity of 14161, and FIG.
FIG. 23 is an exploded perspective view of the tape running reconfiguration W1 structure 161. FIG. Referring to these drawings, head stand 1
Reference numeral 60 denotes a mounting section 163 to which the magnetic head 162 is mounted, and a section from both ends of the mounting section 163 to the magnetic tape loading port side (
A pair of legs 164, 165 extending to the lower side in FIG.
including.

Pinch rollers 1f3G are installed near both ends of the mounting portion 163.
Holding members 167a and 1 that hold a and 166b, respectively
67b is provided. This holding member 167a is rotatably supported around a pongee 168a provided upright on the chassis. Another holding member 167b is rotatably supported by a shaft 168b provided upright on the chassis. The holding member 167a includes a pair of upper and lower holding pieces 169.
A torsion spring 171a is interposed between the holding piece 169a and the holding piece 170i1'i11, which include the holding pieces IG9a and 170g, and the connecting portion 700a that connects these holding pieces IG9a and 17Oa. :1
m is done.

One end of the torsion spring 171a abuts the connection 61700m, and the other end of the torsion spring 171a abuts the red locking piece 163a provided upright on the mounting portion 163 of the head stand 160. Another holding member 167b#3 is also similar.
! &, and the corresponding n portion is shown with a subscript.In this way, the pinch roller 166 &
The crimp screws 171a and 171b that crimp the capstans 174 and 175 are the holding members 167a*IG7b.
Since both ends of the VTM are connected to each other, by pressing the ends of the torsion springs 171a and 171b, the capstan 174. The pinch rollers 166a, 1 (36b) can be pressed against the pinch rollers 175, and when the head stand 160 retreats, the pinch rollers 171a,
The head stand 160 can be moved backward without any load on the head stand 171b.

A guide hole 18 is provided in the leg portion IG4, 165 of the head stand 160.
0.181 is formed. A pongee 182 erected on the chassis is inserted into the guide hole 180, and a pongee 16 is inserted into the guide hole 181.
A retaining hole 183 is also formed in the zero leg portion 164 through which the screw 8b is inserted. Further, a through hole 184 is formed in the leg portion 165, and a locking hook 185 is provided in this through hole 184.

One end of a tension spring 186 is connected to the locks 7 and 185. Further, a guide hole 950 is formed in the # portion 165, and a ring 950 is provided in the guide hole 950.
51 is inserted. Further, one end of tension springs 187, 188 is connected to the legs n165, 164, and the other ends of the tension springs 187, 188 are fixed to the chassis. As a result, the head stand 160 is biased toward the forward direction H1 by the spring force of the springs 187 and 188.

Referring to FIG. 23, the tape running switching mechanism 161
The head stand 1 is controlled by the tape running switching piece 190 and the cam 104k formed on the lower surface of the lower notch tooth 1104.
60, and a movable piece 191 that can be displaced along directions Fl and F2 perpendicular to the forward direction H1 of 60.

The tape running switching piece 190 is swingable around the shaft 37& of the gear 37. Further, a ring 3Bm of a gear 38 is fixed to this tape running switching piece 190. Also,
A guide protrusion 190a is provided on the lower surface of the downstream end of the tape running switching piece 190 in the forward direction H1. This protrusion 1
90a is an arcuate guide hole 192 formed in the chassis.
One end of a torsion spring 193 is connected to a portion of this protrusion 190a that protrudes below the chassis, and the other end of this torsion spring 193 is connected to a lock 7/7 formed on the bottom surface of the chassis. connected to. Upstream (I
An engagement hole 190C is formed at the I end.

On the movable piece 191, a semicircular arc-shaped cam 104kl of the lower notch 111104: abutment pieces 191a and 191b that function as abuttable followers are erected.

Contact pieces 191a, 191 that contact the lower notch gear 104
b is #23 so that the cam 104k can be driven smoothly.
As shown in Figure A, it extends above the center 104R of the cam 104. This prevents the cam 104k from being twisted and damaged when it comes into contact with the contact piece 191a or the 'JPA piece 191b. This contact piece 1
A through hole 191c is formed between 91a and 19ib, and the shaft 110 installed upright on the chassis is inserted through this through hole 191c, and then through the insertion hole 1641 of the lower notched gear 104. As the lower notched gear 104 rotates, the cam 104k comes into contact with the contact piece 191a or 191b and moves in the moving direction F1. The moving piece 191 is driven and displaced in the F2 direction. By this movement of the moving piece 191, the tape running switching piece 190 is angularly displaced around the pongee 37a, the idler gear 39 meshes with the gear 40a (see FIG. 6A), and the left take-up reel 40 is driven, or tooth 1$1
Engaged with 41 and right 1! [i18 reel 42 is driven. In this way, as the lower notched gear 104 rotates, tape running is switched. Lower notch gear 10
4 is in a state where the notch 104a% or the notch 104b faces the drive gear 33 during recording/reproduction. Therefore, the drive of the lower notch gear 104 is stopped. In such a state, when the end position of the magnetic tape is detected by a detection means (not shown), the electromagnetic plant polisher 1
02 is excited, thereby releasing the locked state of the lower notch gear 104 by the blocking member 123, and the lower notch tooth ratio 104 meshes with the drive gear 33. This causes the lower notch tooth 11104 to be rotationally driven, as described above. like cam 1
04, the movable piece 191 is displaced, and the tape is automatically switched. Note that when the transfer piece 191 moves in the direction of arrow F1 as shown in FIG. 23B due to tape running switching, the switching piece 19
The holding member 167a is held by the second inclined surface 650a.
There is an angular displacement in the direction of the arrow in FIG. 3B, thereby loosening the crimp between the pinch row 2166a and the capstan 174.

Similarly, when the switching piece 191 moves in the opposite direction to the direction F1, the pinch roller 166b is slightly separated from the capstan 175 due to the movement of the inclined surface 650b. With this configuration, smooth tape recording/playback is achieved.

A head stand advancement/retraction driving member 200 is provided below the leg portion 165 of the head stand 160 .

This drive! ! The exploded perspective view near member b 200 is Pt524.
As shown in the figure. This driving member 200 includes a first movable piece 20
1, a second movable piece 202, and a connecting portion 203 that connects the movable pieces 201 and 202. A driving protrusion 201a is erected on the movable piece 201, and a locking hook 201b is formed. The other end of the tension spring 186 is connected to the lock 7 hook 201b.

The driving protrusion 201& is the locking piece 2 of the leg portion 165 of the head stand.
Contact with 04. In addition, the movable piece 202 has a guide slot 202.
a is formed. The drive member 200 is configured to be angularly displaceable by a shaft 653 that is erected on a shear that passes through the connecting portion 203 .

A protrusion 45a protruding from the lower surface of the notch tooth 1t145 fits into the guide slot 202a.
45, a blocking piece 45b is provided coaxially with the ring of notch teeth 1145. This blocking piece 45b is similar to the locking piece 20
It is engaged with the locking surface 204a of No. 4. This locking piece 204 is swingable around a support 205 installed upright on the chassis. Further, the locking piece 204 is connected to the other end of a tension spring 20G, one end of which is fixed to the chassis, thereby biasing the locking piece 204 counterclockwise in FIG. 24.

This locking piece 204 is formed with a lock @204e into which a retaining portion 207b formed at the end of the drive shaft 207a of the electromagnetic planter 207 is fitted.

Next, the forward and backward movement of the head stand 160 will be explained. When the head stand is located at the extreme end position in the backward direction H2, the drive member 200 is located at the R end position along the backward direction 1 (2) as shown in FIG. The notch gear 45 has a notch that is the driving tooth 1?L4.
4. Therefore, the notched gear 4
5, no driving force is transmitted, magnetic tape force set) 1
3 is loaded, and the electromagnetic plunger 207 is excited in a state in which it is lowered from the insertionmost position. As a result, the locking piece 2
04 is displaced clockwise in FIG. 25, and the locked state is released. At the same time, the notch gear 45 meshes with the drive gear 44 via the drive member 200 due to the spring force of the springs 187 and 188, and rotational force is applied. Note that the electromagnetic planter 207 is immediately demagnetized, so that the locking piece 204 returns to its original state. Notch in this condition! h
The Te wheel 45 is rotationally driven in the counterclockwise direction in FIG. 25, and the drive member 200 is accordingly angularly displaced in the counterclockwise direction around the pongee 653. Accordingly, the head stand 160 is displaced along the forward direction 111 in accordance with the angular displacement of the drive member 200 by the springs 187 and 188.

In this way, the locking surface 2 of the locking piece 204 is attached to the blocking piece 45b again.
In the state shown in Fig. PJ26 in which 04a is locked, the drive member 200 is in a locked state, thereby stopping the forward movement of the head stand 160.

With the start of the forward motion of the head stand 160, the ends of the torsion springs 171a, 17lb (see FIG. 22) are pressed by the abutting pieces 163a, and the holding members 167a, 167b are thereby held against the capstan. 174.1
Displaced towards 75. Then, when the head stand 160 reaches the extreme end position in the forward direction H1, the magnetic tape is moved to the pinch roller 166m.

166b. As a result, the tape runs while the magnetic tape is in contact with the magnetic head 162, and magnetic tape recording/reproducing operations are performed. When the recording/reproducing operation is stopped and an ejector (not shown) is agitated to eject the magnetic tape force set 13, the blunt gear 207 is energized again, and the drive member 200 is thereby actuated by the spring force of the spring 186. Through this, the notched gear 45 meshes with the drive tooth 44 again and rotational force is applied. As a result, the driving member 200 is angularly displaced in the clockwise direction in FIG.
presses the locking surface 165a of the head stand 160, and the spring 18
The head stand 160 is moved in the backward direction 112 against the spring force of 7,188. In this way, when the terminal position in the backward direction H2 is reached, the locking piece 20
4, the notched gear 45 is locked and the notched portion of the notched tooth 1145 faces the drive tooth 1$144. Then, the rotational drive of the notched gear 45 is stopped.

Such forward and backward movement of the head stand 160 8! In this structure, the spring force of the tension spring 18G for reliably meshing the notched gear 45 with the drive tooth TIL44 is applied when the drive protrusion 201a is in contact with the locking surface 165a (when the head base is retreating or when the head base is moving forward). (inside etc.) has notched teeth $4
This solves the problem of the prior art in which the spring that engages the notched gear 45 and the drive tooth 1144 causes a load when the head base is retracted.

FIG. 27 and FIG. 28 are diagrams for explaining the operation of the movable member 118. In FIG. 27, the locking pin 120 is locked by the locking position 118c of the movable member 118, so that the head stand 160 is in a locked state. Head stand 1 (S.

When the movable member 118 moves along the forward direction H1, the movable member 118 is angularly displaced clockwise in FIG. When the head stand 160 has reached the position, as shown in FIG. 28, the movable member 118 is unlocked from the locking pin 120.

When the head stand 160 performs a backward movement, the movable member 118 is returned to its original state by the spring force of the torsion spring 121. With this structure, the load from the torsion spring 121 does not act on the driving force that drives the head stand 160 when the head stand is retracted, and therefore the load when the head stand is retracted can be reduced. Further, although a guide groove into which the locking pin 120 fits into the movable member 118 is conventionally formed when the head base is retracted, there is no need to provide such a guide groove, and therefore, the conventional guide groove is not formed. However, although the operation has been made unstable due to curvature, shape deformation, and dimensional defects, such problems can be solved in this embodiment.

FIG. 29 is a simplified plan view of the curve beginning mechanism (hereinafter referred to as APS Iso-elli), and FIG. 30 is an exploded perspective view of FIG. 29. The APS mechanism 250 includes a driving member 251 that drives the performance/fast-forward switching gear 35, a tts1 movable piece 252, a second movable piece 253, and an electromagnet 36.
The drive member 251 is rotatably supported by the support 37a of the gear 37.

The switching gear 35 is provided at one end of the drive member 251.
is rotatably supported. The drive member 251 is biased clockwise in FIG. 29 by a tension spring 255 connected at one end to the chassis. Further, a driving protrusion 256 is provided upright on this driving member 251 .

A retaining hole 257 into which the driving protrusion 256 fits is formed in the first movable piece 252 . Further, a retaining hole 258 is formed into which a driving protrusion 258a fixed to the chassis fits. Also, this WS1 movable piece 252 has a head stand 160.
A driving protrusion 259 is provided upright to fit into a retaining hole 183 formed in the leg portion 164 of. Leg part 1 of head stand 160
One end of a tension spring 260 is connected to the lock 164a of 64, and the other end of this tension spring 260 is connected to the movable piece 2.
It is connected to the seven locking hooks 261 of 52. Further, this movable piece 252 is connected to a movable piece 253 by a link 262, and is biased counterclockwise in FIG. 30 by the spring force of the tension spring 260.

An iron piece 263 is fixed to the movable piece 253. This iron piece 2
An electromagnet 36 is placed facing 63.

During the magnetic tape reproducing operation, the electromagnet 36 is demagnetized, so that the primary gear 35 of the drive member 251 is meshed with the teeth 1!29 by the spring force of the bones 255. As a result, the gear 35 has the flywheel 2
Rotational driving force is transmitted from 5 m through gears 27 and 29.

During such an operation, when the fast-forwarding copper is pressed, the electromagnetic plunger 207 is energized, thereby causing the head stand 160 to retreat along the II direction. This backward movement of the head stand 160 causes the driving member 251 to undergo an angular displacement r in the counterclockwise direction in FIG. 29 around the pongee 37m, as will be described later. As a result, the gear 35 becomes the gear 29.
When the head stand 160 reaches the extreme position in the backward direction 112, the gear 35 is in a neutral position in which it does not mesh with either the gear 2Sb or the gear 29.

Therefore, when the unrotated head stand 160 reaches the extreme end position in the backward direction H2, the take-up reel 40.42 moves the protrusion 1000 (
(see Figs. 21 and 22) is the switch 5W4 (first
(see figure 5), thereby setting switch SW4 to 0.
Become Nafi. As a result, the electromagnet 36 is turned on, and the iron piece 263 is magnetically attracted to the electromagnet 3G.

Next, a detection means (not shown) detects that the electromagnet 36 is at 0Nafi, and this causes the electromagnetic plunger 207 to switch to ONa! again. ! becomes. As a result, the head stand 160 moves forward along the forward direction H1, and the magnetic head 1
62 reaches the fast forward position where it touches the magnetic tape.

Note that as the head stand 160 moves forward, as will be described later,
The drive member 251 is further angularly displaced around the wheel 37a in the counterclockwise direction in FIG.
T! 34, this causes the 7th wheel 25b
A rotational driving force of 1 m is transmitted to tooth $35, so tooth 1
! 35 is driven to rotate at high speed. As a result, the right m take-up reel 40 or the left 1118 take-up reel 42 is driven to rotate at a high speed, thereby achieving rapid forwarding.

When the next white head is detected during such a fast-forward operation, the electromagnet 36 activates OF Fai! As a result, the drive member 251 is angularly displaced clockwise in FIG. 30 around the wheel 37m, as will be described later.
The gear 35 shown in Figure 9 is a tooth! It returns to the playing state that matches $129.

Next, the operation of the drive member 251 will be explained in more detail with reference to figure m31A. In FIG. 31A (1), a playing state is shown, and in this FIG. 31A (1), the spring force of the spring 255 is Dl, and the spring force of the spring 260 is D1.
2, the distance between the spring 255 and the shaft 37m is -1, the distance between the drive projection 256 and the pongee 37m is 2, the distance between the drive projection 25G and the drive projection 259 is -3, and the distance between the drive projection 259 and the spring In this tjS31A diagram (1) where the distance from the drive protrusion 260 is m4, the drive protrusion 256 is the fulcrum, so what are the upward force D' and the downward force D2' on the drive protrusion 256? It is shown in @1 formula and Ws2 formula.

In such ttS1 equation and the second equation, the force D1'
and force D2' satisfy the third equation.

D! '>D2'...(3
) Therefore, the driving member 251 is urged clockwise around the pongee 37a.

When the fast-forwarding copper is pressed and pushed as described above in this state, the head stand 160 performs a backward movement, whereby the first movable piece 252 is moved so that the drive protrusion 258a is moved into the engagement hole by the spring force of the spring 260. 258 and stops. As a result, the drive member 251 is angularly displaced counterclockwise around the pongee 37a, and the gear 35 is positioned at the neutral position.

The action of force at such a head stand retracted position is caused by the third
This is shown in Figure 1A (2). In FIG. 31A (2), the distance between the driving projection 256 and the driving projection 258a is -6, the distance between the driving projection 258a and the spring 260 is 5, and the upward force of the driving projection 256 is D1.
', and the downward force of the driving protrusion 256 is D2''.

Note that at this time, the drive protrusion 256 is in contact with the inner peripheral surface of the engagement hole 257, and the drive protrusion 258a is in contact with the inner peripheral surface of the engagement hole 258.
It is in contact with the inner peripheral surface of. The driving protrusion 259 is connected to the retaining hole 1
The force relationship of the drive protrusion 256 in such a retracted position of the head stand, in which it does not come into contact with the inner circumferential surface of the head 83, is shown by the tjs4 equation and the 5th equation.

Further, the force D2' and the force D1' satisfy the sixth formula.

D2'>Di'
...(6) Head 1 from the electromagnetic plant lock state
When 60 moves forward, the first movable piece 2 moves with the pongee 262 as a fulcrum.
52 rotates clockwise, and as a result, the inner peripheral surface of the retaining hole 183 comes into contact with the driving protrusion 259, so that the retaining hole 25
7 presses the drive protrusion 256. Therefore, the drive member 2
51 rotates counterclockwise, and the tooth $35 meshes with the gear 34. In this way, the rotational driving force of the flywheel 25bllll is transmitted to the gear 35, and rapid forwarding is executed.

[After the Ib cue is completed, the electromagnet 36 is de-energized, and the head stand 160 moves further and moves to the performance position. At the same time, the locked state of the pongee 262 of the second movable piece 253 is released, and the driving member 251 is completely locked (by the above-mentioned formulas 1 to 3,
Return to playing state. This completes the APS operation.

Effects As described above, according to the present invention, it is possible to reduce the load when the head stand 160 moves away from the tape running position (retreats).

[Brief explanation of the drawing]

FIG. 1 is a plan view of a magnetic tape recording/reproducing apparatus 110 according to an embodiment of the present invention, FIG. 2 is a front view thereof, FIG. 3 is a rear view thereof, FIG. 4 is a right side view thereof, and FIG. is its left side view,
FIG. 6 is a bottom view thereof, FIG. 6A is a simplified diagram showing the drive system of the tape deck 10, and FIG. 7 is a gripping member IGat1.
6b and related parts; FIG. 8 is a simplified plan view of the vicinity of the gripping members 16a and 16b; FIG.
The figure is a sectional view taken from section line #1IX-IX in Fig. 8, and Fig. 10 is a sectional view taken from section line XX in Fig. 8.
Figure 1 is a sectional view taken from section an-n in Figure 8, and Figure 12 is
The figure is a diagram for explaining the operation of the gripping members 16a*16b when inserting/ejecting the magnetic tape cassette 13.
In Figure 3, the gripping member 16atlGb is the magnetic tape cassette 1.
14 is a plan view of the lifting/lowering W1 structure of the magnetic tape cassette, FIGS. 15 and 16 are exploded perspective views of the lifting mechanism and its related components, and FIG. A perspective view showing the bottom of the upper notched gear 103, the first
8 is a simplified diagram showing the elevating mechanism of the magnetic tape cassette 13, FIG. 18A is a diagram for explaining the relationship between the cam 112 and the follower 133d, and FIG. 13B is a diagram for explaining the relationship between the cam 500 and the blocking member 123. 19 and 20 are plan views showing the vertical movement of the magnetic tape cassette 13, and FIG. 20A is a diagram showing the driving member 137 and the moving member 14.
20B is a side view showing the configuration near the lifting lever 148, and FIG. 21 is a plan view showing the arrangement state of the head stand 1.
60 A plan view of the vicinity of the upstream tape running switching mechanism 161,
Pt522 is an exploded perspective view of the head stand 160 and related components, FIG. 23 is an exploded perspective view of the vicinity of the tape travel switching mechanism 161, and FIG. 23A is an operation of the moving piece 191 and the lower notch gear 104. Plan view showing the state, No. 23
Figure B is a plan view showing the configuration near the moving piece 191, Figure 24 is an exploded perspective view of the vicinity of the drive member 200, and Figure 25 is the upstream P.
Figure t526 is a simplified plan view showing the operating state of the structure near the drive member 200, Figures 27 and 28 are diagrams for explaining the operation of the movable member 118, and Figure 29 is an A P
S a, a simplified plan view of fit, PIS 30 is an exploded perspective view of TL & 29, Fig. 31 is a plan view of the iron piece 263 being attracted to electromagnet 254 in the APS mechanism, and Fig. 31A is the operation of the APS mechanism. FIG. 32 is a perspective view of a typical prior art. 10...Tape deck, 11a3, 11b3.77
゜78...Guide hole, 13...Magnetic tape cassette,
13m”・Bunbu, 14a, 14b-Holder, 16a,
16b = Gripping member, 17, 133, 137, 200
, 251... Drive member, 21... Actuation lever, 23
...Motor, 25m = 25b-7 Rye wheel, 27
．． 28, 29. 30. 34. 35. 37, 40, 41,
42, 43...Gear, 33.44...Drive gear, 3
9... Idler gear, 45.103, 104... Notch gear, 52.52b... Holding claw, 57=125-
155-186-187- 188.206,255,
260... Tension spring, 58, 58b, 79... Guide shaft, 61.62... Guide piece, 63, 64... Guide groove, 88, 111.117, 121.171a, 171
b, 193... Torsion spring, 90... Actuator, 91a, 9 lb-holding bottle, 102, 207...
・Denji Plant Tsuya, 104, 112.500...
-Cam, 113...first cam surface, 114...12 force cam surface, 115...third cam surface, 118...engaging piece,
123... Blocking member, 123i, 123h... Guide projection, 124° 146-... Moving member, 133b, 13
7a, 137b, 138.201a, 256, 258 turtle, 259...drive protrusion, 133d...holo 7.14
8... Lifting lever, 152.183.257,25
8.400... Engagement hole, 152a, 400m... Contact surface, 153... Biasing member, 160... Head stand,
161...Tape running switching mechanism, 162...Magnetic head, 166a, 16 Gb-...Pinch roller, I G'la, 1 G7b...Holding piece, 17
41175 Capstan, 190 Tape running switching piece, 191 Moving piece, 191a=19
lb-Abutment piece, 252.253...Movable piece, 680
...Princess) board, 681...7 Lexiple board,
A1...Insertion direction, A2...Ejection direction, El...
Ascent direction, F2...downward direction, Fl, F2...movement direction, F3...biasing direction by the spring 155 of biasing member 153, Hl...forward direction, F2...retreat direction, S
W 1... Limit switch agent Patent attorney Number of strokes Keiichi Figure 6A Figure 7 Figure 8 Figure 9 Figure 14D 14a Figure 10 Figure 11 Figure 12 Figure 13 Figure 17 Figure 18 Figure 18A Figure 18B Figure 19 Figure 20 Figure 20A! fC208Figure 23AFigure 23BFigure 25Figure 26Figure 31A Flash

Claims (1)

[Claims] The magnetic head 162 is placed close to the magnetic tape running position.
A head stand 160 to which the magnetic head 162 is fixed for separation, and a first spring 187, 1 that biases the head stand 160 in a direction in which the magnetic head 162 approaches the running position of the magnetic tape.
88, a capstan 1741175 provided at a fixed position, and a holding member 16 that rotatably holds pinch rollers 166a and 166b that are pressed against the capstans 174 and 175.
7a, 167b, and pinch rollers 166a, 16
Such retaining members 167a, 167 are supported in a fixed position for angular displacement about an axis parallel to the axis of 6b.
b, is interposed between the holding members 167a, 167b and the head stand 160, and exerts a spring force to move the holding members 167a, 16 when the magnetic head 162 moves close to the tape running position.
A pinch roller crimping mechanism characterized by comprising second springs 171a and 171b that urge pinch rollers 166a and 166b to resiliently contact capstans 174 and 175.