JPS63100662A - Elevating device for magnetic cassette tape - Google Patents

Abstract

PURPOSE:To position the elevation completion position of a cassette at high accuracy by constituting such that the engagement pin of a cassette holder and an elevation lever are engaged to elevate the holder and such that the holder is energized in the elevating direction. CONSTITUTION:When a driving member 137 turns at the end position of the inserted cassette, a moving member 147 moves in a horizontal direction F. Hence a longitudinal member 144 linked to the member 147 moves in a direction A. The elevation lever 148 can turn with a shaft 11b2 as a center. Due to the move of the member 144 the cassette holder goes up and down along holes 11b3 and 11b4. When the cassette rises completely, a spring 155 energizes the driving member 137 and the holder 14 in a direction E1. Hence the cassette can be surely positioned in the height direction from the elevating position of the cassette, thereby reducing load at the time of elevation.

Description

[Detailed description of the invention] Industrial use! 2. The present invention is inspired by the IH for raising and lowering a RA tape cassette.

BACKGROUND ART In a conventional magnetic tape cassette elevating device 2, in the ascending or descending operation, the magnetic tape cassette is supported by a plurality of sleeves at the descending completion position, that is, the playback position.
The height of the completed position is determined during construction. but,
It is in an unstable state at the ascent completion position, and positioning at the ascent completion position is difficult. In the prior art that solves this problem, as shown in FIG. 32 (1), a holding member 30 that supports the magnetic tape cassette 300 and moves up and down with the magnetic tape cassette is used.
1, the lock piece 302 is engaged with the tension spring 3.
The engagement state from the lock pin 304 is released by a mechanism (not shown) against the spring force of 03.

In this state, the holding member 301 moves up and down,
As shown in Fig. 32 (2) from the lifting completion position, distance B
It is withered so that it increases by an extra M1. In this state, the lock piece 302 is in a lockable state with the lock pin 304 due to the spring force of the spring 303. From the state shown in FIG. 32 (2) in which the holding member 301 is raised from the raised completion position, the holding member 301 is secured to the raised completion position r1, and the lock piece 302 is attached to the lock pin as shown in FIG. 32 (3). 304, the locked state is completed, and the raised position is determined in the height direction.

As mentioned above, the mechanism for raising the raised position further from the raised completed position and locking it down to the raised completed position is the holding member and the raised position lock, as described above. Conventionally, it has been limited to those in which m fit is connected.

Therefore, it has been desired to use such an overstroke mechanism even in a lifting device in which a locking mechanism is not connected to a holding member to perform positioning in the height direction at a raised completion position.

Problems to be Solved by the Invention An object of the present invention is to provide a magnetic tape cassette elevating device that can ensure the positioning of the magnetic tape cassette's ascent completion position with high precision.

Means for solving the two problems The present invention provides a holder 14a that holds a magnetic tape cassette 13 and has engagement pins 91a and 91b that protrude outward.
, 14b and the engagement pins 91a and 91b are engaged between the first position where the magnetic tape cassette 13 is inserted/ejected and the second position where the magnetic tape cassette 13 travels.
a, 91b, and the engagement pin 91 at the insertion/ejection position.
a, 91b are in contact with a chassis having such guide holes 11a3, 11b3 at their extreme positions, and holders 14a, 14bl: Z! a moving member 14G that displaces the holders 14a and 14b in the upward direction E1 by moving in a predetermined moving direction F1, and has a first contact surface 146a facing downstream in the moving direction F1; 14G, and the moving direction F1
A biasing member 153 having a contact surface 152a of f\'$2 facing the upstream side, a movable protrusion 137b interposed between the first contact surface 146a and the fjS2 contact surface 152a, and a biasing member 153 in the direction F3 in which the 2'5 contact surface 152a moves; and the driving protrusion 137b is moved in the heavy industry moving direction F1, and the engagement pins 91a and 91b move in the heavy industry guide hole 11a3°11b3.
This is an elevating device for a magnetic tape force set F, characterized in that it includes means for further displacing and stopping the biasing member 153 against the spring force of the spring 155 while in contact with the extreme end position of the magnetic tape force set F. .

Function According to the present invention, the holders 14a and 14b holding the magnetic tape cassette 13 are upwardly displaced along the upward direction E1 by the moving member 146 moving in the predetermined moving direction F1. When the holders 14a, 14b reach the raised position, the engaging pins 91&, 91b protruding outward from the holders 14a, 14b come into contact with the extreme end positions of the guide holes 11a3, 11b3 of the shank. In this state, the engagement pins 91a and 91b are moved in the upward direction E by the spring force of the spring 155 of the biasing member 153 in the F3 direction.
A biasing force of 1 is provided, thereby achieving positioning at the completed lifting position.

Embodiment Figure m1 is a plan view of a magnetic tape recording/reproducing device 10 according to an embodiment of the present invention, and Figure tPJ2 is a front view thereof.
Figure 3 is its back view. tS4 is its right side view, FIG. 5 is its left side view, and FIG. 6 is its rear view. With reference to these drawings, magnetic tape recorder D
/A magnetic tape cassette 1 is mounted on the left and right side walls 11a and 11b of the chassis of the playback device (hereinafter referred to as tape deck) 10.
Holders 14a and 14b are provided to hold holder 3 so as to be movable up and down.

The magnetic tape cassette 13 is inserted into the holders 14a and 14b with the magnetic tape oriented horizontally and the magnetic tape directed toward the insertion direction Al.

Above fii15 of the chassis (front side of the page in Figure 1)
There is a grip nTX stage 1 that grips the magnetic tape cassette 13.
G is provided. This gripping means 1G is a gripping member 1 [3a
, 16b. This gripping member IGa, 16b is supported by a driving member 17, and the magnetic tape cassette 1
It is driven to be openable and closable within a plane that includes the top surface of 3. This driving member 17 is inserted in the insertion direction A along guide rails 18a and 18b formed on the left and right side walls 11a and 11b of the shaft.
1 and the discharge direction l\2.

A moving member 124 movable along the moving direction F (left-right direction in FIG. 11) is disposed on the loading frame 19, and the operating lever 21 is combined with this moving member 124. One frame is formed with a guide slot 22 extending along the insertion direction A1 of the magnetic tape cassette 13.As will be described later, the drive member 17 is displaced along the guide slot 22, so that the magnetic tape cassette 1
3 can also be moved via the gripping means 16 between a tape insertion end position and an ejection position.

The t56Δ diagram is a simplified diagram showing 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 2
A pulley 24 is fixed to the output shaft of No. 3. An endless belt 26 is wound around the pulley 24 and the right seven live wheels 25a. Furthermore, this belt 2G has a flywheel 2S.
lz! l'ffE is being touched, which causes the motor 23
The flywheels 25a and 25b are driven to rotate in the direction of the arrow in FIG. 6A. A marking/re-soil gear 27 is coaxially fixed to the flywheel 25m. This record n
/Resoil gear 27 meshes with teeth] 1ft28.29,
A gear 30 meshes with the teeth rlt28, and a gear 31 is coaxially fixed to this gear 30. The gear 31 has teeth rl.
132 mesh with each other, and a drive gear 33 is coaxially fixed to this tEJ wheel 32.

IJ, Tlt29 and the flywheel 25b
A performance/fast-forward switching tooth TrL35 is interposed between the fast-forwarding and fast-forwarding teeth TrL34, which are coaxially fixed to the fast-forwarding direction.
When conduction occurs, the drive mechanism described later moves the fast-forward river surface 11.
34, and when the electromagnet 3G is in the OFF state, the switching gear 35 meshes with the teeth 11129.

The mountain Tt135 meshes with the tII wheel 37, and this [1$37
meshes with a gear 38, which has an idler tooth rt13 coaxially located above the bottom wall 15 of the chassis.
is fixed. This gear 38 and idler teeth 11t
39, the tape 7, which will be described later, is transferred to the left
ta coaxially fixed to the axis of the s-taking reel 40
A gear 41 meshing with either the wheel 40a or the gear 41
is meshed with a gear 42a fixed coaxially to the pivot of the right take-up reel 42. When the idler gear 39 is meshed with the gear 41, the right take-up reel 42 is driven to rotate in the direction of the arrow. When the gear 39 is released from meshing with the teeth ItL41 and is meshing with the t11 wheel 40a, the left take-up reel 40 is rotationally driven.

Said teeth! 1I29 meshes with tooth $43 again, this tooth! 1
A drive gear 44 is coaxially fixed to 143. This drive gear 44 meshes with a notch gear 45 for advancing and retracting the head base.

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.
(This is a simplified plan view of the vicinity of Sb.

The gripping member IGm 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 16b at the upstream end.
A retaining pawl 52 is formed extending toward the proximal direction. The upstream end surface of the holding claw 52 in the 1.p entry direction A1 moves the guide surface 53 that guides the text part 13a of the magnetic tape cassette 13 to f.
At, the end face of the holding claw 52 on the downstream side in the insertion direction A1 engages with and holds the protrusion 13a of the magnetic tape cassette 13, and the engaging surface 54 is used to hold the magnetic tape cassette 13. A boss 55 having a shaft hole is formed at the downstream end of the bent portion 51 in the insertion direction A1.

In addition, the straight portion 50 of the gripping member 1011 has a lock 7 5.
6 is formed, and this locking hook 56 is provided with a tension spring 57.
are concatenated. Further, a guide ring 58 extending downward is formed in this straight a portion 50.

The other gripping member 16t1 is also similar to the gripping member 16a.
Corresponding parts are shown with subscripts.

The drive member 17 includes a flat plate-shaped base 60 and guide pieces 61 and 62 provided on both sides of the base 60 in the width direction. G2 has idle rail 18a+18
Guide grooves 63 and 64 into which bfJ' fits are formed. A gripping member IGa is provided on the front side of the base 60.

A stepped surface 65 is formed so that the tension spring 57 does not come into contact with the upper surface of the 2& part 60 when the 16t1 is inserted on the drive member 17 along the insertion direction A1. Continuing with this step surface 65, a q cutout 66 is formed in the shape of I&.

Further, on the front surface [30a of the base portion 60, locking pieces 67-68 are formed which hang down near both ends in the width direction.

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

These six notches form 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 869, the other notch 70 is defined by the support surface 73 and the circular arc surface 74. A pivot shaft 75 that is inserted through the insertion hole of the boss 55 is erected on the second support surface 71 . Yet another support surface 73
A pivot shaft 76 is provided upright to pass through the eleven holes of the boss 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 5111.58b of b is inserted, and the gripping member IGa
, 16b are displaced along the guide elongated holes 77, 78 as the magnetic tape cassette 13 is inserted/ejected. A guide shaft 79 C is erected on the rear side of the base 60 . Also, the base 60f
) A guide shaft 80 extending downward is formed on the lower surface of the end. This guide shaft 80 fits into the guide elongated hole 22 of the loading frame 19.

The actuation lever 21 includes a JIS81 standard and a boss 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 ring 79 fits. This guide hole 85 includes a straight line 85a extending in the longitudinal direction of the base 81 and an inclined portion 85 bent and extending toward the insertion direction A1.
b, and a lock portion 85c. base 81
One end of a torsion spring 88 is connected to the torsion spring 88 , 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 second pressing surface 89 can be used to press the seventh cutuator 90 of the limit switch SWI as described later.

Next, the mounting conditions of the gripping members 16a, 1 (3b), the driving member 17, and the operating lever 21 will be explained.

The guide shafts 58, 58b of the gripping members 1f3a, 16b fit into the guide elongated holes 77, 78 of the driving member 17, and the 11 holes in each of the bosses 55, 55b of the gripping members 16a, IGb fit into the pivot shafts of each driving member 17. 75.7G is inserted. Thereby, the gripping members IGa, IGb are spring-biased by the spring force of the spring 57 in a direction toward each other around the pivot shaft 75,76. As a result, magnetic tape cassette 1
3 is inserted, the text part 13a is held by the holding claw 52. S
2& can be climbed and held securely.

Figure 9 is a cross section of Figure 8! It is a cross-sectional view seen from IX-IX, and what is Fig. 10? Cutting surface line X -X h- of tsB diagram
FIG. 11 is a cross-sectional view of the Pt58 diagram viewed from the forest road -°C. The holders 14a and 14b have engaging pins 91a and 91b that protrude outward, respectively.
is formed. These engaging pins 91a and 91b are connected to @? of the chassis. , 11a, 11b are formed in guide slots 11a3, 11b3 (see Figure 194 and Figure fi5).
The magnetic tape cassette 13 that fits into the
The holders 14a and 14b are inserted from the front side toward the insertion direction A1.

Referring to FIG. 10, the drive member 17 has guide pieces 61, 62
It is supported by the idle rails 18a, 18L+ and by a retaining ring 93 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, it does not wobble due to vibrations, etc., and therefore the insertion/ejection movement of the magnetic tape cassette 13 can be performed smoothly. 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.

Furthermore, as shown in Figure 511, the distance between the guide shaft 58b and the post 55! 1 can be made relatively large, so that when the protrusion 13a presses the guide surface 53.degree. Even if a force is applied to the gripping members 16a and 16b, the gripping members 16a and 16b remain in a horizontal state (
You can do this.

Therefore, the holding claws 52) 52b can be climbed to securely hold the protrusion 13n of the magnetic tape cassette 13.

? tS12 is a diagram for explaining the forceful actions of the gripping members 1ea and IC+b when inserting/ejecting the magnetic tape cassette 13. The magnetic tape cassette 13 is inserted horizontally from the front holder 1 of the holders 14a, 14b. At this time, the gripping members 1'Ga, 1f3b are held at Pt5 where the holding claws 52, 52b are brought close to each other by the spring force of the spring 57.
The situation is shown in Figure 8. The magnetic tape cassette 13 is manually pushed in along the insertion direction A1, so that the protrusion 13a of the magnetic tape cassette 13 becomes Pt51.
It comes into contact with the guide surface 53 as shown by 2G(1). When the magnetic tape cassette 13 is further pushed in in this state, the gripping members IGa, 16b move in a plane including the upper surface of the magnetic tape cassette 13 in the direction shown by arrow 95 in FIG. 12(1). It is pushed out against the spring force of the spring 57, and both ends of the text part 13a on the downstream side in the insertion direction A1 are held by the holding claws 52,
After passing the top of the magnetic tape cassette 52b, the engaging surface 54° is closed by the spring force of the spring 57, and the downstream end surface of the magnetic tape cassette 13 in the insertion direction A1 is connected to the drive member 1.
7 locking piece G7. Contact with G8 (see Figure 7) and fjS
As shown in FIG. 12(2), the magnetic tape cassette 13 is securely gripped by the engaging surfaces 54, 54b. In this way, the gripping members IGa, 16b are configured to be able to be opened and closed on the upper surface of the magnetic tape cassette 13, and the protrusion 13a of the magnetic tape cassette 13 is held by the holding claws 52, 52b as shown in FIG. Since the upper surfaces of the gripping members 16a and 1OL+ are gripped in a state lower than the upper surface of the protrusion 13a, the tape deck can be made thinner.

Next, the magnetic tape cassette 1 shown in FIG. 12 (2)
When the user further pushes in the magnetic tape cassette 13 slightly while it is being held by the gripping members IGa and IGb of 3, the drive member 17 is activated by the spring force of the torsion spring 88 in the state shown in FIG. The drive member 17 is moved in the insertion direction A1 via the guide shaft 79 by the clockwise angular displacement of the operating lever 21 in FIG. until it reaches the end position 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 screen-
E23 is powered on.

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

When the magnetic tape cassette 13 is ejected, an eject button (not shown) is pressed, and the electromagnetic plunger 1 is pressed.
02 (see figure ttS15) becomes conductive, and the drive shaft 102a (see figure 15 ff1) of the electromagnetic plunger 102 retracts. As a result, the concave plate of the top-notched TA wheel 103 (see FIG. 15) is retracted. Therefore, the holders 14a, 1
4b is raised by the elevating mechanism from the magnetic tape cassette loading completion position and reaches the magnetic tape cassette insertion end position. By this upward movement of the holders 14a and 14b,
Tsumugi 138 (see Figures 7 and 15) is the operating lever 2.
The operating lever 21 is displaced from the straight portion 85a of the guide hole 85 of No. 1 to the inclined portion 85b of the boss 82.
It begins to undergo angular displacement around Q in the direction of arrow G (see Figure 7).

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

1 (3b begins to move toward the discharge direction A2.
8 moves to the lock portion 85c of the guide hole 85, the drive member 17 and the gripping members 16a, IGb reach the discharge direction completion position. 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 IGb, so that the magnetic tape cassette 13 is prevented from flying out from the ejection port due to the ejection operation.

After that, the operator pulls out the magnetic tape cassette (13) toward the front a (discharge direction), and as a result, the holding claws 52 and 52b holding the text part 13a are angularly displaced in the direction of arrow 95 in FIG. 12 (2). The magnetic tape cassette 13 is the gripping member 1
The held states from 6a and 16b are released.

In this way, the gripping members 16a and 16bt can be freely opened and closed along the upper surface of the magnetic tape cassette 13, and the text part 13m of the magnetic tape cassette 13 is held by the opening and closing operations of the holding claws 52 and 52b of the gripping members IGa and IGb. Since the tape deck 10 is moved for insertion/ejection, the tape deck 10 can be made thinner. Further, the drive member 17 is supported at three points: the drive member 17, the guide pieces [31, 132, and the guide shaft 80], and the drive rJh member 17 is configured so as to reciprocate along the idle rails 18a, 18b and the guide slot 22. Therefore, angular displacement of the drive member 17 in a plane including the insertion force direction is prevented, and further angular displacement around the ring line parallel to the insertion direction can be prevented.
It becomes possible to perform extremely smooth insertion/ejection operations. * By providing the locking pieces 67 and 68 as the abutment surface of the magnetic tape cassette 13 of the drive member 17, the contact area can be reduced, and warpage or deformation of the drive member 17, as well as the magnetic tape cassette 13, can be prevented. 1! The shadow 7 caused by I impact force can be further reduced. Furthermore, the holding claws 52, 52b are moved by the spring force of one spring 57.
Since the operation is made as follows, the number of parts can be reduced.

FIG. 14 is a plan view of the elevating mechanism for the magnetic tape cassette 13, and FIGS. 15 and 16 are exploded perspective views of the elevating fi mechanism and its related components. Bottom of the chassis! ! ! 1
5, Export 110 will be erected.

In this pongee 110, the lower notch gear 103 and the lower notch gear 1
04 is rotatably supported. This lower notch? il*1
o4=+i, lW direction 1: Notches 104a and 104b are formed with an interval of 180"ft1l. Lower notch ti
On the periphery of the J table 104, there is a protrusion 10=i that protrudes upward.
c, 104d are erected. In addition, the central part of the lower notched gear 104 has a protrusion 1 having a needle through which the pongee 110 is inserted.
04e will be erected. This protrusion 104e is a circle O? !
'Is 104 r, and a drive which protrudes outward in the radial direction at 180° intervals on the outer peripheral surface of this cylindrical portion 104f! !
! 1J portions 104g and 104h.

One end of the torsion spring n111 abuts on either the protrusion 104c or the protrusion 104d, and the other end of this torsion spring 111 abuts on the end surface 123k of the blocking member 123, and the ring portion 1
11a is fitted into and fixed to the post 123b. Bottom notch T! 1′! A semi-circular cam 104k is formed on the lower surface of the cam 1104 as shown in FIG. 15A.

Bottom notch T! A notch 103a is formed in the J car 103. 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 includes a first cam surface 113 that extends linearly, and a first cam surface 112a of this first cam surface.
An arc-shaped second cam surface 114 continuous to the rotation direction Y upstream gA end of the lower notched gear 103 of 13, and the first cam surface 113
and the second cam surface 114, the third cam surface 115 has a substantially S-shape. The Pt52 force cam surface 114 has a minimum diameter R with respect to the shaft hole 11G at the end connected to the first cam surface 113.
1, and as it goes in the opposite direction of the rotational direction Y, the diameter gradually increases until it reaches the maximum diameter R2 at the end connected to the third cam surface 115.
It is curved into an arc shape. Second cam surface 11
Near the minimum diameter of No. 4 is the notch 103al: It! I'm reading.

This cam surface 113, 114° 115 has a torsion spring 1
One end of 17 abuts.

The ring portion 117a of this torsion lever hl17 is the movable member 118.
protrusion 118al: substituted, the other end of the torsion spring 117 is fixed to the chassis. Therefore, upper edge chipped tooth $10
3 is biased in the rotational direction Y by a torsion spring 117.

A boss 118b having an insertion hole coaxial with the protrusion 118a is formed on the lower surface of the movable member 118. this boss 1
A pivot 119 erected on the chassis is fitted into 18b, so that the movable member 118 can be angularly displaced around the axis of the pivot 119. The movable member 118 has a head stand 160 (
A locking recess 118C is formed that can lock the locking bottle 120 that is provided upright (see FIG. 21). Also, movable member 1
18, the protrusion 104c of the lower notch TGJ car 104, 1
04dl: Has a locking surface 118d that can be brought into contact.

Furthermore, this movable member 118 has upper side missing teeth 11103.
A locking protrusion 118e is formed that comes into contact with a locking surface 500d (see FIG. 17) formed on the lower surface of.

One end of a torsion spring 121 is connected to this movable member 118, and the sleeve 0121a of this torsion spring 121 is fitted into the boss 118b1, f6 of the torsion spring 121! ,′
4 is fixed to the chassis. As a result, the movable member 1
18 is spring biased in the direction of arrow C by the spring force of the torsion spring 121.

As shown in FIG. 17, a cam 500 coaxial with the shaft hole 116 is formed on the lower surface of the top notch gear 103. As shown in FIG. This cam 5
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 locking surface 500b that is planar and extends radially outward =
These locking surfaces 500b and 500c, including 500e, are formed at intervals of 180° in the circumferential direction, and the upper edge notched gear 1
Drive piece 123a of blocking member 123 that prevents rotation of 03
It comes into contact with the locking surface 123m1. Movable member 1 during performance
18 engages with the locking surface 500d of the cam 500 with the top edge notch 1f31$1103, thereby causing the top edge notch tiJF1
03 is prevented from rotating. In this state, the lower notch gear 104 does not mesh with the wA face gear 33,
Therefore, the top missing tooth $103 will not rotate.
However, when the electromagnetic planter 102 is erroneously excited, the blocking member 123 is angularly displaced to release the rotation of the upper tooth 1iL103, as will be described later. Therefore, by the locking protrusion 118e of the movable member 11F3,
If the mouth of the top notched gear 103 is not prevented, the top notched gear 103 will rotate by mistake, which will start the upward movement of the magnetic tape cassette 13 and damage the magnetic head. This prevents things like this from happening.

A boss 123b is provided upright on the blocking member 123. The ring portion 111a of the h-jiripon 111 is mounted on the boss 123b. A pongee (not shown) standing upright 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 has an insertion hole 12 through which the second gear 33 is inserted.
3C is formed. 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 movable or rotating members.

Further, this blocking member 123 is formed with a hanging portion 123d. A locking groove 123e is formed in this hanging portion 123d. The electromagnetic plunger 1 is attached to this lock 7i123e.
02 Kakeru! ! When the electromagnetic plant gear 102 into which the retaining part 102b formed at the end of the JI pongee 102a is fitted is magnetized aJ and the drive shaft 102a is retracted le, the blocking member 123 moves in the direction of arrow D (see figure fn15). There is a slight angular displacement in the opposite direction, and the spring force of the spring 117 causes the recessed gear 103 to mesh with the drive IJli$33. Thereafter, the electromagnetic planter 102 is demagnetized, and the force of the spring 111 causes the blocking member 123 to return to a predetermined position.

Upper tooth missing! A loading frame 19 is arranged above the $1103, blocking member 123, and the like. The loading frame 19 has an insertion direction A of the magnetic tape cassette 13.
A moving member 124 displaceable in a direction F perpendicular to 1 is mounted.

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, 129 extending along the moving direction F1. A guide protrusion 130 erected on the loading frame 19 is fitted into the guide elongated hole 127, and a guide protrusion 131 erected on one loading frame is fitted into the guide elongated hole 128.
A guide protrusion 132 erected on one loading frame is fitted into the guide elongated hole 129, and a guide hole 133b erected on the drive piece 133a of the drive member 133 is fitted into the moving member 124. 135 is formed. This guide hole 135 extends in the insertion direction A1 of the magnetic tape cassette. The moving member 12.t also has a portion 136 formed roughly in an L-shape and extending KV along the moving direction F1.
a and a portion 136 extending orthogonally to this portion 13Ga1.
A guide hole 13G having b is formed. This guide hole 1
The drive protrusion 137a of the drive member 137 fits into the drive member 36.

Of the moving member 124! Sleeve 1 is on the right end in Figure 515.
38 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, into which the pivot shaft 133c of the drive member 133 is fitted. %1all$L103 A follower 133d that protrudes so as to come into contact with the force ram surfaces 113, 114, and 115 is fixed. This holore 133d
is gently fitted 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. Due to the rotation of the top notch gear 103 in the Y direction, the follower 133d moves from the end P1 of the second cam surface 114 to the end P2.
The period during which the follower 13 is in contact with the
3d is in the insertion operation period while it is in contact with the third cam surface 115 from the RA portion P2, and is in the falling operation period when it is in contact with the first cam surface 113. Loading frame 19
A limit switch SW1 is installed on the
An insertion hole 143 through which the protrusion 123f of the blocking member 123 is inserted is formed near the cutter 90 of the limit switch SW1. W again! A guide groove 600 into which the protrusion 137m of the AgJ member 137 fits is formed.

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

Note that the operating lever 21 has a screw spring 88 as described above.
The pongee 900 is biased clockwise in FIG. 15 by the pongee 900.

Drive 1! ! When the upper bevel gear 103 is rotationally driven by the 1rtt33, the tjS2 cam surface 114 of the cam 112
, the follower 133d is angularly displaced around the axis of the pivot 133c in the counterclockwise direction in the Pt515 diagram.

As a result, the moving member 124 is displaced in a direction opposite to the moving direction F1. Also, the holo 7133d is the third cam surface 115
When the Pt5l force reaches the surface 113 from the spring 12
5, the moving member 124 is displaced along the moving force direction F1.

Referring to FIG. 16, longitudinal members 144a and 144b are attached to the outer sides of side walls 11a and 11b of the chassis. The first member 144a is connected to the transfer member 146 via a layered connecting piece 145.

Further, the other long 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 first 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 first member 144b. Further, a guide hole 150 extending in the longitudinal direction is formed in this elongated member 144b, and a projection 11b1 formed at *gzb is gently inserted into this guide hole 150. The configuration of the first member 144b is also the same for the other arm member 144a.

A fine hole 148c is formed in the front 21 lowering lever 148, and the pongee 11b2 formed on the mouth wall 11b is confined in this fine hole 148c, so that the raising/lowering lever 148 has an angle around the yuzu 11b2. Displaceable. side! ! ! 1 tb has a lifting guide hole 1 lb3. which extends along the lifting direction E. 11b4 is formed. Holder 14
The engagement pin 91b of b is inserted into the guide hole 11 of the 1111 wall 11b.
b3, and then through the guide hole 14 of the lifting lever 148.
8b. Also, the engagement pin 91b1 of the holder 14b
is inserted through the guide hole 11b4 of the lll1l wall 11b. As a result, angular displacement of the lever 148 about the axis 11b2 causes the holder 14b to move up and down along the ascending direction E1 or the descending direction E2i.

side! ! l! The protrusion 11b1 of 11b is the longitudinal member 144b.
It is inserted gently into the guide hole 150 of. Longitudinal member 144b
With the displacement in the insertion direction Δ1 or A2 direction, the protrusion 148a of the lifting lever 148 is displaced, and the lifting lever 148 moves around the pongee 11b2.

Such a lifting lever 148 and its related structure are also similar to the part 144afq.
is provided.

Engagement holes 400 and 401 are formed at the end of the moving member 146 on the longitudinal member 140 side. A biasing member 153 having an engagement hole 152 at a position corresponding to the engagement hole 400 is supported by the movable member 146 by a pin 154 so as to be angularly displaceable. A tension spring 155 is attached to one end of this biasing member 153.
One end of this tension spring 155 is connected, and the other end of this tension spring 155 is connected to a locking hook 156 of the moving member 14G. The drive protrusion 13711 of the drive member 137 is inserted through the engagement hole 152 of the biasing member 153 and the engagement hole 400 of the moving member 14G. Kakeru! ! ! The angular displacement of the 73 member 137 causes the movable member 146 to be displaced along the moving force direction F1 or F2, and thereby the longitudinal members 144a, 144b
is displaced in the insertion direction A1 or A2. The lever 148 is angularly displaced in accordance with the displacement of the longitudinal members 144a, 144b, thereby causing the holders 14a, 14b to move up and down along the up and down direction.

FIG. 18 is a diagram showing a simplified elevating mechanism for the magnetic tape cassette 13. Fig. fjS18 shows a state in which the ejection is completed, and in this state, the rotation of the upper tooth fll103 is prevented by the blocking member 123. Also, the motor 23 is deenergized. Further, since the drive protrusion 138 is located at the locking portion 8Sc of the guide hole 85 of the operating lever 21, the operating lever 21 resists the spring force of the torsion spring 88 and is stopped in the state shown in FIG. . This situation 3
Also, as shown in Figure 18A (1), Holo 713
3d is spaced apart from the cam 112. In this state, the magnetic tape 13 is inserted, and the gripping members 16a,
16b, and the locking piece 67 of the drive member 17
．． When the end surface of the magnetic tape cassette 13 comes into contact with the magnetic tape cassette 68 and is further pushed in slightly, the actuating lever 21 is angularly displaced clockwise in the Pt518 diagram by the spring force of the torsion spring 88. As a result, the magnetic tape cassette 13 and the drive member 17 are moved in the insertion direction A1 as shown in FIG.
reaches the end position. In this state, I! ! Moving member 13
The protrusion 137a of No. 7 is located in the portion 136a of the guide hole 136 of the moving member 124, and the angular displacement of the W:A moving member 137 is prevented.

In this state as shown in FIG.
is energized. 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 shown in FIG. 18A (2), the follower 133d 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 moves from the portion 136a of the guide hole 136 of the moving member 124. The engagement shape of the drive member 137 is released, and the rotation prevention shape of the drive member 137 is released. In this state, as described above, the drive gear 33 rotates due to the power applied to the motor 23, which causes the upper notch gear 103 to rotate, thereby causing the follower 133d to rotate.
comes into contact with the @3 cam surface 115. Therefore, the moving member 124 moves noticeably along the moving direction F1 in accordance with the rotation of the upper tooth 1103. Accompanying this, the driving member 137 is angularly displaced, and the moving member 14G is displaced in the moving direction F2 by the action of the driving protrusion 137b. Therefore, the longitudinal members 144a and 144b are displaced in the insertion direction A1, and the lever 148 is moved in the direction of arrow B (see Fig. 20I3).
angular displacement. By doing this, as mentioned above, the holder 1
4a, 14b descending in the E2 direction, the moving member 12
4 reaches the R end position in the moving direction F1, the fall of the magnetic tape cassette 13 is completed, and such a state 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 blocking member 12 is
The locking surface 123a1 of No. 3 is the locking surface 500b of the cam 500.
The rotation of the upper notched gear 1°3 is locked.

At the time of ejection, the electromagnetic plant gear 102 is turned on, whereby the blocking member 123 is angularly displaced and the locked state of the upper bevel gear 103 is released. Therefore, the top edge is missing ′r! l
The J wheel 103 is rotationally driven, and thereby the follower 133
d is guided along the second cam surface 114, thereby displacing the moving member 124 in the moving direction F2. Along with this, the drive member 137 is angularly displaced in the counterclockwise direction in FIG.

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 the portion 136& of the guide hole 136, thereby preventing the drive member 137 from rotating.

Therefore, the rising operation is locked. - The crab notch tooth 11!1103 further rotates, thereby moving the follower 133 to the insertionmost position C) in FIG.
d is moved in the moving direction F2. Therefore, it is guided by the protrusion 138 that passes through the guide hole 85 of the operating lever 21.
The actuation lever 21 is angularly displaced against the spring force of the torsion spring 88. As a result, the drive member 17 moves in the ejection direction A2 and reaches the ejection completion position shown in FIG. 18. In such a discharge completion state shown in the tjS18 diagram,
The blocking member 123 and the cam 500 are arranged at the position 5! shown in FIG. 18B (2). Because of the relationship, the driving protrusion 1 of the blocking member 123
23r maintains the limit switch SWI in a conductive state. Therefore, the top edge missing tC car 103 is
Further rotation continues, and the blocking member 123 is rotated as shown in FIG. 18B (3).
By coming into contact with the locking surface 500c of the 8-gear 103 notched at the upper edge as shown in , the blocking member 123 is angularly displaced to the normal position, and the pressing force of the 7-cutter 90 of the limit switch SW1 is released. At the same time, the motor 23 stops. The ejection operation is thus completed.

In this way, by driving the motor 23, the cam 112 of the top notch gear 103 and the follower 133d perform the lifting and lowering operations, so smooth lifting and lowering is achieved with no noise. can do. Further, although a plunger dedicated to raising and lowering has been used in the past, this embodiment does not use such a plunger, 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 set reliably using a simple mechanism.

In addition, when the magnetic tape force set (set) 13 is completed, tt
As shown in Figure S20A, the drive protrusion 137b is connected to the engagement hole 1.
The drive protrusion 137b is held between a contact surface 152a facing upstream in the moving direction F1 of the engagement hole 400 and a contact surface 400a facing downstream in the moving direction F1 of the engagement hole 400, and the driving protrusion 137b is moved in the moving direction F3fIl by the spring force of the spring 155. As shown in FIG. 20B, the engaging pins 91a and 91b are further urged in the upward direction E1 while in contact with the guide holes 11a3 and 11b3. Therefore, the holder 14a,
14b is reliably positioned in the height direction at the raised position. Also, the spring 155 for applying this biasing force is
Since it does not have any effect when ascending, the load during ascending is reduced.

Furthermore, in this embodiment, since the tension spring 125 serves both as a suction needle for the magnetic tape cassette 13 and as a main function of the magnetic tape cassette 13, a stable state is reliably maintained even when the tape deck 1o vibrates. can do.

In the conventional technology for stabilizing the magnetic tape cassette 13 when the tape deck 10 vibrates, two springs are used, and the spring force of these springs locks the magnetic tape cassette 13 even after ejection is completed. A force acts on the locking mechanism in the direction E2 to move the magnetic tape cassette 13 downward, and therefore a large load is applied to release the lock tj!?i17. 125 and the operating lever 21 to prevent the spring force from acting on the holders 14a and 14b during locking.

Figure m21 is a plan view of the head stand IGO and tape running switching near the structure 161, and figure ptS22 is a plan view of the head stand IGO and tape running switching structure 161.
60 and 1112 to this! FIG. 23 is an exploded perspective view of the components shown in FIG.
FIG. 1 is an exploded perspective view of FIG. Referring to these drawings, the head stand 160 includes a mounting portion 163 to which the magnetic head IC2 is mounted, and a pair of legs extending from both ends of the mounting portion 163 toward the magnetic tape loading port (lower rXQ in FIG. 21). 1
(Including 34, 1G5.

Pinch rollers 166a are provided near both ends of the mounting portion 163.
, 1 (36b), holding members 167a and I
CTb is provided. This holding member 167a is rotatably supported around a shaft 168a provided upright on the chassis. The other holding member 167b is freely supported by the pongee IG8b which is 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 pieces 16a and 170a, including the holding pieces 169a and 170m, and the connecting portion 700m that connects these holding pieces 169a and 17Oa. will be installed on the

One end of the torsion spring 171a abuts the connecting portion 700a,
The other end of the torsion spring 171a is attached to the mounting part 1 of the head stand 160.
63 and comes into contact with a locking piece 163a erected thereon. The other holding member 167b also has a similar feature, and the corresponding part is shown with annex b. , 175 crimping torsion spring 1
71a and 171b are made of steel whose both ends are connected to the holding member 167a and ICTb, so by pressing the ends of the screw springs 171a and 171b as described later, the pinch roller is attached to the capstan 174 and 175. 16
6a and IGf3b can be pressed together, and when the head stand 160 is retreating, the head stand 160 can be moved backward without any load from the springs 171a, 171b.

The leg portion 1134.1GS of the head stand 160 has a guide hole 1.
80.181 is formed. A pongee 182 erected on the chassis is inserted into the guide hole 180, and a pongee 182 is inserted into the guide hole 181.
0 leg that 68b inserts? ! An engagement hole 183 is also formed in 1s164. Further, a through hole 184 is formed in the leg g165, and a locking hook 185 is provided in this through hole 184. A tension spring 186 is attached to this locking 7tsuku 185.
One end of is connected. In addition, there is a guide hole 950 in the leg n165.
is formed in this guide hole 950.
One end of a tension spring 187, 188 is connected to G 5 , 164, and the other end of this tension spring 187, 188 is fixed to the string. With this, the head stand 16
0 is the forward direction H1 due to the spring force of springs 187 and 188.
The spring is biased toward the

Referring to FIG. 23, the tape line switching mechanism 161
The head stand 16 is moved by the tape running switching piece 190 and the cam 104k formed on the lower surface of the lower notched gear 104.
0 forward direction! -11 in the direction F1. A moving piece 191 that can be displaced along F2 is included.

The tape switching piece 190 can swing around the pongee 37a of the vJ car 37. Further, a carrier 38a of the own weight 38 is fixed to this tape running switching piece 190. Further, the downstream side j of the tape running switching piece 190 in the forward direction H1
A guide protrusion 190a is provided on the lower surface of the second part. This protrusion 190a has an arc-shaped guide hole 1 formed in the shear.
92, and one end of a torsion spring 193 is connected to a portion of this protrusion 190a that protrudes downward from the chassis, and the other end of this torsion spring 193 is connected to a locking catch 194 formed on the bottom surface of the chassis. Concatenated. Tape running + JJ replacement piece 190 in the forward direction of the head stand! ! An engagement hole 190c is formed at the upstream end of 1.

The movable piece 191 is provided with contact pieces 191a and 191b that function as followers that can come into contact with the semicircular cam 104k of the lower notched gear 104.

Contact piece 191a, 1 that contacts lower notch tooth +11104
91b extends above the center 104R of the cam 104, as shown in FIG. 23A, so that the cam 104k can be driven smoothly. With this, cam 10
4k is prevented from being twisted and damaged when it comes into contact with the abutting piece 191a or the abutting piece 191b. This contact piece 1
A through hole 191c is formed between 91a and 191b, and the pongee 110, which is set upright on the chassis, is inserted through this through hole 191c, and then through the insertion hole 104 of the lower notched gear 104. Rotation of the lower notch @$104: Therefore, the cam 104k contacts the contact piece 191a or 191b and drives and displaces the movable piece 191 in the moving directions Fl and F2. By this movement of the moving piece 191, the tape running switching piece 190 is angularly displaced around fi'37a,
Idler tooth IL39 is gear 40a (see Figure 6A!!t)
If the reel 40 for 8 m is driven,
Or the right 11118 reel 4 that meshes with the gear 41
2 is driven. In this manner, tape running is switched as the lower notch tooth $104 rotates. The lower notch gear 104 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 [1171104 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 gear 102 is excited, thereby releasing the locking state of the lower notch tEi wheel 104 by the blocking member 123, and lowering the lower notch tiJ. The gear 104 meshes with the drive gear 33, whereby the lower notch gear 104 is rotationally driven.
As mentioned above, the moving piece 19 is moved by the action of the cam 104.
1 is displaced, and the tape running is automatically switched. Note that by switching the tape running, for example, the moving piece 1
91 moves in the direction of the arrow F1 as shown in FIG. 23B, the holding member 167a is angularly displaced in the direction of the arrow in FIG. Stan 1
74 becomes loose.

When the switching piece 191 is moved in a direction opposite 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 .

An exploded perspective view of the vicinity of this drive member 200 is shown in FIG. This driving member 200 includes a first movable piece 201, a second movable piece 202, and a connecting portion 203 that connects the movable pieces 201 and 202. The movable piece 201 has a driving protrusion 20.
1a is erected, and a locking hook 201b is formed. The other end of the tension spring 186 is connected to the locks 7 and 7 201b.

The driving protrusion 201a is connected to the locking piece 2 of the n section 165 of the head stand.
Contact with 04. In addition, the movable piece 202 has a guide slot 202.
a is formed. Kakeru! l! 11 member 200 is the connecting part 2
It is configured to be able to be angularly displaced by a pongee 653 erected on the chassis that is inserted through the inside of the pongee 653.

A protrusion 45m protruding from the lower surface of the notched gear 45 fits into the guide slot 202a, and the notched tooth 1145
A blocking piece 45b is provided coaxially with the axis of the notched bevel gear 45 on the upper surface. This blocking piece 45b is engaged with the locking surface 204a of the locking piece 204. This locking piece 204 is swingable around a shaft 205 erected on the chassis.

Also, the other end of a tension spring 206, one end of which is fixed to the chassis, is connected to this locking piece 204, thereby causing the spring to move counterclockwise as shown in Figure tjS24! 3 has been done.

This locking piece 204 is formed with a locking groove 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 extreme end position along the backward direction 112, as shown in FIG. In this state, the notched tooth 71145 has its notched portion aligned with the driving tooth IL.
The situation is now approaching 44. Therefore, notched tooth I
The magnetic tape cassette 13 to which no driving force is transmitted is loaded into the rL45, and the electromagnetic plunger 207 is excited in a state lowered from the insertionmost position. As a result, the locking piece 204 is displaced in the direction 51 at the time of f:tS25, and the locked state is released. At the same time, springs 187 and 188
The notch gear 45 meshes with the drive tooth 44 through the drive member 200 by the spring force, and rotational force is applied. Note that the electromagnetic plunger 207 is immediately demagnetized, so that the locking piece 204 returns to its original state again. In this state, the notched gear 45 is rotated counterclockwise in FIG. 25, and the drive member 200 is accordingly angularly displaced around &[53 in the counterclockwise direction. Regarding this, hella)
? Unit 16011.1rbl 87, 18 G l::
Yotsui! As the HrB1 member 200 is angularly displaced, it is displaced along the forward direction I+1. In this manner, the driving member 200 is in the locked state in the state shown in FIG. 26 in which the locking surface 204a of the locking piece 204 is locked with the blocking piece 45b again, and the forward movement of the head stand 160 is thereby stopped.

With the start of the forward motion of the head stand 160, the ends of the screw 9 springs 171a, 17 lb (see FIG. 22) are pressed by the abutting pieces 163a, thereby holding the holding members l07a, 1G? LL is capstan 174,
175. Then, when the head stand 160 reaches the Etc position in the forward direction H1, the magnetic tape is moved to the pinch roller 166a.

166b brings about a state in which they are pressed together. As a result, tape running is performed with the magnetic tape in contact with the magnetic head 162, and writing/reproducing operations on the magnetic tape are performed. Record D/When the eject button (not shown) is pressed to eject the magnetic tape cassette 13 after stopping the reproduction operation, the plunger 207 is energized again, and the force of the spring 18G causes the plunger 207 to be ejected via the drive member 200. Then, the notched gear 45 meshes with the driving tIJ wheel 44 again and rotational force is applied. As a result, the driving member 200 is f5
Angular displacement in the clockwise direction in Fig. 26, thereby causing the drive protrusion 2
01a presses the locking surface 165a of the head stand 160, and moves the head stand 160 in the backward direction H2 against the spring force of the springs 187 and 188. In this way,
When the terminal position in the backward direction II 2 is reached, the notched gear 45 is locked again by the locking piece 204, and the notched portion of the notched gear 45 faces the drive gear 44. And the rotation of the notched float 45! I! J+
will be stopped.

In such a forward/backward mechanism for the head stand 160, the spring force of the tension spring 186 for reliably meshing the notch gear 45 with the drive gear 44 is such that the drive protrusion 201a is
5a (when the head stand is retracting or moving forward, etc.), the notch tooth 1t145
This solves the problem of the prior art in which the spring that engages the notched gear 45 and the drive tooth rrt44 becomes a load when the head base is retracted.

FIG. 27 and FIG. 28 are diagrams for explaining the operation of the movable member 113. In FIG. 27, the locking pin 120 is locked by the locking recess 118C of the movable member 118, so that the head stand 160 is in a locked state. If the head stand 160 moves along the forward direction H1, OK! ! The J1 member 118 is angularly displaced around the pivot shaft 119 in the clockwise direction in FIG. 27 against the spring force of the torsion spring 121, and when the head stand 160 reaches the extreme end position in the forward direction H1, it is shown in FIG. t528. As shown, movable member 118
The locked state with the locking pin 120 is released.

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 caused by the torsion spring 121 does not act on the driving force that drives the head stand 160 when the head stand is retracted, so that 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, in this embodiment, such problems have been solved by the present embodiment.

Figure 29 shows the track start mechanism (hereinafter referred to as APSfi structure)
FIG. 29 is a simplified plan view of FIG. 29, and FIG. 29 is an exploded perspective view of FIG. The APS rock mechanism 0 includes a drive member 251 that drives the performance/fast-forward switching gear 35, and a Pt51
A drive unit including a movable piece 252, a second movable piece 253, and an electromagnet 3G! ! The IJ member 251 is supported by the pongee 37m of the gear 37 so that it can be rotated freely.

The switching gear 35 is provided at one end of the drive member 251.
is rotatably supported. The drive member 251 is displaced clockwise in FIG. 29 by a tension spring 255, one end of which is connected to the chassis. Further, a driving protrusion 25G is erected on this driving member 251.

The first movable piece 252 is formed with an engagement hole 257 into which the drive protrusion 256 fits. Further, an engagement hole 258 into which a drive protrusion 258a fixed to the chassis fits is formed. Also, this PJl movable piece 252 has a head stand 160.
25 drive protrusions that fit into the engagement holes 183 formed in the n-portion 164 are provided upright. 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. The movable piece 252 is connected to the movable piece 253 by a pongee 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 playback operation, the electromagnet 36 is nT.
Therefore, the driving member 251 is in a state where the switching gear 35 is meshed with the tooth 29 by the spring force of the spring 255. As a result, the gear 35 has the flywheel 2
The rotational driving force is transmitted from 5& via gears 27 and 29.

During such an operation, when the fast-forwarding copper is pressed four times, the electromagnetic plunger 207 is energized, thereby causing the head stand 160 to retreat along the )12 direction. This backward movement of the head stand 160 causes the driving member 251 to angularly displace in the counterclockwise direction in FIG. 29 around the shaft 37m, as will be described later. As a result, the gear 35 separates from the gear 29, and when the head stand 160 reaches the end position of the rearward direction (12), the gear 35 moves away from the gear 25b and the gear 29.
It will be in a state of neutral position where it does not mesh with any of 9.

Therefore, the take-up reel 40.42 is not rotated and such a head stand 160 is in the backward direction) t of I2.
When reaching the fifth position, the protrusion 1000 of the head stand 160
(See Figures 21 and 22) is the switch SW 4
(see Figure 15), and this causes the switch S
W4 becomes ON state Yu. This turns on the electromagnet 36.
In this state, the iron piece 263 is magnetically attracted to the electromagnet 3G.

Next, a detection means (not shown) detects that the electromagnet 36 is in the ON state, and thereby the electromagnetic plunger 207 returns to the ONa state. With this, head stand 1
60 moves forward along the forward direction H1, and the magnetic head 162
reaches the fast-forward position where it lightly touches the magnetic tape. As will be described later regarding the advancement of the head stand 160, the drive member 251 is further angularly displaced in the counterclockwise direction in FIG. 29 around the shaft 37a, and when the magnetic head 162 reaches the fast forward position, the gear 35 is a gear 34 as shown in FIG.
As a result, the rotational driving force on the 7rai wheel 25b side is transmitted to the gear 35 i! Therefore, the gear 35 is driven to rotate at a high speed. As a result, the right f1m winding reel 40 or the left winding reel 42 is driven to rotate at a high speed, thereby achieving rapid forwarding.

When the beginning of the next song is detected during such fast-forwarding, is it electromagnetic? 736 is in the OFF state, and as a result, the driving member 251 is angularly displaced around the pongee 37a in the clockwise direction of Pt530 as described later, thereby creating a playing state in which the gear 35 meshes with the two gears shown in FIG. 29. to return to.

Next, referring to FIG. 31A, the operation of the driving member 251 is as follows:
will be explained in more detail. In FIG. 31A (1), the playing state is shown II9, and in this FIG. Distance theory 1
and the distance between the drive protrusion 256 and the 37m plow is 2
and the distance between the driving protrusion 256 and the driving protrusion 259 is the plow 3.
and the distance between the driving protrusion 259 and the spring 260 is
In this m314 to FIG.
It is shown in the formula and the second formula.

like this? tS1 formula and! In the jS2 equation, the force D
1' and force D2' satisfy the third equation.

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

In this state, when the fast-forwarding copper is suppressed as described above, 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 258 by the spring force of the spring 260. It comes into contact with the inner peripheral surface and stops. As a result, the driving member 251 is angularly displaced counterclockwise around the pongee 37a, and the i&table 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 drive protrusion 25G and the drive protrusion 258a is -6, and the distance between the drive protrusion 258a and the spring 2GO is 1.
65, and the upward force of the drive protrusion 256 is D1', and the downward force of the drive protrusion 256 is D2''. At this time, the drive protrusion 256 comes into contact with the inner peripheral surface of the engagement hole 257. The drive protrusion 258a is connected to the engagement hole 2.
It is in contact with the inner peripheral surface of 58. The force relationship of the drive protrusion 256 in such a head stand retracted position where the drive protrusion 259 does not come into contact with the inner circumferential surface of the engagement hole 183 is shown by the fourth and fifth equations.

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

D 2″〉D 1′
(6) When the head 160 moves forward due to the electromagnetic plant lock condition, the first movable piece 252 rotates clockwise using the pongee 262 as a fulcrum, thereby closing the engagement hole 18.
3 comes into contact with the drive protrusion 259, so that the engagement hole 257 presses the drive protrusion 256. Therefore, it is difficult!
The IJ member 251 rotates counterclockwise, and the gear 35 meshes with the gear 34. In this way, the circulation driving force on the flywheel 2Sb side is transmitted to the gear 35, and fast forwarding is executed.

After the beginning of the song is completed, the electromagnet 3G is de-energized, and the head stand 160 is thereby further advanced and moved to the performance position. At the same time, the locked state of the pongee 262 of the second movable piece 253 is released, the driving member 251 is completely unlocked, and the playing state is returned according to the first to third equations described above. This completes the APS operation.

Effects As described above, according to the present invention, the positioning at the ascent completion position can be determined with iQi accuracy. The spring is
Since it is pressed only during the upward movement, it is possible to prevent the load from increasing during the upward movement.

4. Drawing (') MJ,'ll t theory RJIr:t
Fig. Si is a plan view of the magnetic tape recording/reproducing apparatus 10 according to an embodiment of the present invention, Fig. f52 is a front view thereof, and No. 3r:! J is its back view, Figure 4 is its right side view, ttSs figure is its left side view, Figure 6 is its bottom view, and 6A is the drive of tape deck 10! I! ! FIG. 7 is an exploded perspective view of the gripping member 16a, IGl+ and related parts, FIG. 8 is a simplified plan view of the vicinity of gripping members 1Ga and 16b, and FIG. 9 is a simplified view of the J system. Cutting plane line rX-IX in Fig. 8
10 is a sectional view taken along the cross section line XX in FIG. A diagram for explaining the operation of the gripping members IGa, IGb when inserting/ejecting the tape cassette 13, FIG. 13 shows the gripping members 16a, 1 (
ibh' A front view showing a state in which the magnetic tape cassette 13 is being held, FIG. 14 is a plan view of the elevating mechanism for the magnetic tape cassette, and FIGS. 15 and 16 are exploded perspective views of the elevating mechanism and its related components. , Fig. 17 shows the top notch gear 1.
Figure 18 is a simplified view of the magnetic tape force set (13) and Figure 18A is a diagram illustrating the relationship between the cam 112 and the follower 133d. FIG. 18I3 is a diagram for explaining the relationship between the cam 500 and the blocking member 123, FIGS. 19 and 20 are plan views showing the vertical movement of the magnetic tape cassette 13, and FIG.
The figure is a plan view showing the arrangement of the drive member 137 and the transfer member 146, FIG. 20B is a side view showing the I1 configuration near the lifting lever 148, and FIG. A plan view, fjS22 is an exploded perspective view of the head stand 160 and related parts, FIG. 23 is an exploded perspective view of the vicinity of the tape running switch 161, and FIG. 23A is the moving piece 191 and the lower notch tooth J. ′
! ! 23B is a plan view showing the configuration of the vicinity of the moving piece 191, FIG. 24 is an exploded perspective view of the vicinity of the drive member 200, and FIGS. 25 and 26 are the vicinity of the moving member 200. of? FIG. 27 and FIG. 28 are diagrams for explaining the operation of the movable member 118, and FIG. 30 is an exploded perspective view of FIG. 29, and FIG. 31 is an APS structure in which the iron piece 263 is connected to the electromagnet 2
The top view of the state in which it is sucked into 54, Figure 31A is AP
FIG. 32, which is a diagram for explaining the operation of SFI information, is a diagram showing a typical prior art.

10-...Tape deck, 11a3.11b3.77°78...Guide hole, 13...Magnetic tape cassette, 1
3a...'Protrusion, 14a, 14b--Holder, 16a
, I Gb - gripping member, 17,133,137,20
0.251... Drive member, 21... Actuation lever, 2
3...Motor, 25a, 25b...Flywheel, 27.28, 29, 30.34, 35, 37.40=
41.42,43... Gear, 33.44... Drive gear, 39... Idler gear, 45.103,104.
... Notched gear, 52, 52b ... Holding claw, 57, 1
25,155,186,187,188.206,25
5,260... tension spring, 58.58b179...
・Guide shaft, 61.62... Guide piece, 63, 64...
Guide groove, 88, 111, 117, 121.171a, 1
71b, 193... Torsion spring, 90... Actuator, 91a, 9 lb-engaging pin, 102, 207
...Electromagnetic plunger, 104, 112.500
...Cam, 113...First cam surface, 114...Second cam surface, 115...Third cam surface, 118...Engagement piece, 123...Blocking member, 123i, 123h ...
Guide protrusion, 124° 146-... Moving member, 133b,
137a, 137b, 138.201a, 256, 25
8a, 259... Drive protrusion, 133d... Holo 7.
148...Elevating lever, 152.183,257,
258,400...Engagement hole, 152a, 400a...
- Contact surface, 153... urging member, 160... head stand, 161... tape running switching mechanism, 162...
Magnetic head, 166a, 16Gb...pinch roller,
I G 7a, I G Tb-holding piece, 174.175
... Capstan, 190 ... Tape running switching piece, 191 ... Moving piece, 191a, 19 lb-
Contact piece, 252.253...Movable piece, 0f30...
Printed circuit board, 681...7 Lexiple board, A1.
...Insertion direction, A2...Ejection direction, El...Upward force direction, F2...Downward direction, Fl, F2...Movement direction,
F3... Direction of biasing force by the spring 155 of the attachment 13 member 153, Hl... Forward direction, [I2... Retreat direction, S
'tV 1...Limitsu F Switch Agent Patent Attorney
Number of strokes: Keiichi, Figure 2, Figure 3, Figure 6A, Figure 7, Figure 8, Figure 9, 4o14a, Figure 10, Figure 11, Figure 12, Figure 13, Figure 17, Figure 18, Figure 18A, Bacteria, 18B, Figure 19. Figure 20 Figure 20A OB Figure 23A Figure 23B Figure 25 Figure 26 207 207a 207b 31A! 21

Claims (1)

[Claims] Holders 14a and 14b that hold the magnetic tape cassette 13 and have engaging pins 91a and 91b that protrude outward are engaged with the engaging pins 91a and 91b, and the magnetic tape cassette 13 is inserted. /The engaging pin 91 is located between the first position where the magnetic tape cassette 13 is ejected and the second position where the magnetic tape cassette 13 travels.
a, 91b, and the engagement pin 91 at the insertion/ejection position.
a, 91b are interlocked with the chassis having such guide holes 11a3, 11b3 and the holders 14a, 14b, which come into contact at their extreme positions, and move in a predetermined moving direction F.
1, the holders 14a and 14b are displaced in the upward direction E1, and the first
a moving member 146 having a contact surface 146a of
Biasing member 1 having second contact surface 152a facing upstream side
53, a drive protrusion 137b interposed between the first contact surface 146a and the second contact surface 152a, and a direction F in which the second contact surface 152a moves the biasing member 153.
3, the driving protrusion 137b is moved in the moving direction F1, and the engaging pins 91a, 91b are moved into the guide holes 11a3, 11b3.
a device for lifting and lowering a magnetic tape cassette, comprising means for further displacing the biasing member 153 against the spring force of the spring 155 and stopping the biasing member 153 in a state in which the biasing member 153 is in contact with the most end device of the magnetic tape cassette.