JPH02149964A - Cassette tape deck - Google Patents

Abstract

PURPOSE:To reduce the number of parts and to reduce a cost by permitting a pinch lever to press and switch capstans by means of the operation of a head and the driving force switching operation of a reel axis. CONSTITUTION:When the head operation member of a play lever 16, etc., operates, the pinch lever 24 is slid to the operation member through an engagement means in accordance with the switching action of the switching lever, and one of pinch rolls 25 or 26 is pressed by one of the corresponding capstan 12 or 13. In such a case, the pinch lever 24 is elastically slid, and pressurizing of the pinch rolls 25 and 26 for the capstans 12 and 13 can be performed more satisfactorily by constituting the engagement means by one spring member having a pair of leg piece parts. Thus, the number of the parts and the cost can be reduced by constituting the pinch rolls in such a way that they are selectively pressed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a reverse type cassette tape deck for reciprocating the tape.

[Summary of the invention]

In the cassette tape deck according to the present invention, a pinch lever that pivotally supports a pair of pinch rollers corresponding to a pair of capstans that are rotated in opposite directions is moved in accordance with the movement of the play lever or the play lever. The pinch lever is attached to a head operating member such as a head base so as to be slidable in a direction substantially perpendicular to the operating direction of the operating member, and this pinch lever is a switching lever that switches between a pair of reel shafts when the operating member is operated. engaged with the lever via an engaging means and slid in response to the switching operation of the switching lever;
By configuring the pinch rollers to be selectively pressed against the capstans, the pair of pinch rollers can be selectively pressed against the pair of capstans without operating the pinch lever (play operation, reel axis switching operation, etc.). This is done in conjunction with each other, making it possible to simplify the operation and the configuration.

[Conventional technology]

Conventionally, various switching mechanisms for switching the tape running direction in reverse type cassette tape decks have been proposed.

As this tape running switching mechanism, for example,
Some of these are disclosed in Japanese Utility Model Publication No. 31457 and Japanese Utility Model Application Publication No. 155031/1983.

What is disclosed in Japanese Utility Model Application Publication No. 58-131457 is that a pair of pinch rollers corresponding to a pair of left and right capstan shafts are located on both left and right sides of a head board on a mechanical chassis and are separately pivotally supported. When both pinch roller levers are selectively rotated by an operating member, the pinch rollers supported by the pinch roller lever apply the tape to the corresponding capstan shaft. The pinch roller levers are in rolling contact with each other so that the running direction of the tape can be switched by selective rotation of both pinch roller levers.

Furthermore, in the device disclosed in Japanese Utility Model Application Publication No. 60-155031, a pair of pinch rollers corresponding to a pair of left and right capstans are pivotally supported on a common pinch roller substrate, and the pinch roller substrate and the head substrate are different from each other. The pinch roller board is movable in the front-back direction and can be rotated, and this pinch roller board is selectively rotated clockwise and counterclockwise with respect to the head board by a slide lever, and this selective rotation causes one side to rotate. The pinch roller is in rolling contact with the corresponding capstan via a tape, and the running direction of the tape can be switched by rotating the pinch roller substrate using a slide lever.

[Problem to be solved by the invention]

Among the conventional techniques, in the former, a pair of pinch rollers corresponding to a pair of left and right capstans are each supported by separate pinch roller levers, and these pinch roller levers are separately attached to the mechanical chassis. Since both the pinch roller levers are pivoted and selectively operated by unique operating members, the structure is complicated, the number of parts is large, and assembly is time-consuming, resulting in high costs.

In the latter case, the pair of pinch rollers are pivotally supported by a common pinch roller board, but this pinch roller board is also rotated by a unique operating member to selectively bring both pinch rollers into contact with the capstan. Since the configuration is such that the configuration is simple, it is difficult to simplify the configuration.

The present invention has been made in view of the problems of the conventional technology, and its purpose is to simplify the configuration, reduce the number of parts, and reduce costs, thereby improving performance. The purpose is to provide a good cassette tape deck.

[Means to solve the problem]

In order to achieve the above object, the cassette tape deck of the present invention includes a pair of reel shafts, a pair of capstans rotated in opposite directions, and a pair of pinch rollers corresponding to the pair of capstans. It has a freely pivoted pinch lever, a play lever or a head operating member such as a head base that is moved in response to the movement of the play lever, and a switching lever that switches the reel shaft. The switching lever is provided with an engaging means that is attached to the actuating member so as to be slidable in a direction substantially perpendicular to the operating direction of the actuating member, and that engages the pinch lever when the actuating member is actuated. .

Preferably, the engaging means is constituted by a spring member having a pair of leg portions.

[Function] With the above configuration, when the head operating member such as the play lever is operated, the pinch lever is slid against the operating member via the engagement means in response to the switching operation of the switching lever, and one pinch roller is moved. It is pressed against one of the corresponding capstans.

In this case, by constructing the pair of legs of the engaging means with a through spring member, the pinch lever is slid elastically, and the pinch roller can be more effectively pressed against the capstan.

〔Example〕

An embodiment in which the present invention is applied to a cassette tape deck will be described below with reference to the drawings.

In the figure, (1) shows the main chassis of the cassette-type tape deck, which includes the supply side reel drive shaft (hereinafter referred to as the S-side reel shaft) (2) and the take-up side reel drive shaft (hereinafter referred to as the T-side reel shaft). (3) is supported, and both reel shafts (2), (3
) have gears (4) and (5) concentrically fixed to them, respectively, and a rewind gear (6 ) are engaged.

On the other hand, the gear (5) of the T side spindle (3) and the rewind gear (
A pick-up lever (7) is located between the pick-up lever(
It is engaged with the interlocking gear (9) coaxially supported with the pivot shaft of 7), and is switched and engaged with the T-side gear (5) and the rewind gear (6) by the swinging action of the pick-up lever (7). It is made to be done. Also, the take-up lever (7)
A protrusion (10) that faces the back side of the main chassis (1) is protruded from the lower surface of the other end (inner end), and a toggle spring (11) is provided between the protrusion (10) and the main chassis (1). ) is stretched, and the pick-up lever (7) is forcibly biased in both rotation directions by the toggle spring (11), so that the switching gear (8) is shifted to the T-side gear (5) or the rewind gear ( 6) so as to be reliably engaged.

The main chassis (1) also has a reverse running side capstan (hereinafter referred to as RVS side capstan) (12) corresponding to the S side reel shaft (2) and a forward running side capstan (12) corresponding to the T side reel shaft (3). A side capstan (hereinafter referred to as FWD side capstan) (13) is supported through the shaft, and each of the capstans (12) and (13) is equipped with a pulley-shaped flywheel (12) and (13) having a capstan gear in the center. 14) and (15) are fixed on the back side of the main chassis (1).

(16) is a play lever provided on the front side of the main chassis (1) so as to be able to slide in the directions of both reel shafts (2) and (3). (17) is formed, and an operator (18) is provided protrudingly provided on the outer edge side, which corresponds to the protrusion (10) of the pick-up lever (7) from both sides when the play lever (16) slides. A pair of guide claw pieces (19)
, (20) extend in a curved manner to face each other. A head (21) is attached to the inner center of the rising wall (17) of this play lever (16) via a holder (22), and this play lever (16) is compressed between it and the main chassis (1). By interposing the coil spring (23), the reel shaft (2), (
3) so as to be biased in a direction away from.

Note that tape guides (22a) and (22b) are formed on the inner edges of both sides of the head holder (22) mentioned above, and attachment parts (22c) and
(22d) is provided protrudingly.

(24) is a pair of pinch rollers (25), (26)
The play lever (16) is a pinch lever that is pivoted at a distance slightly wider than the distance between the capstans (12) and (13).
A claw piece (16) is disposed so as to be slidable laterally along the inside of the rising wall (17), that is, in a direction perpendicular to the sliding direction of the play lever (16), and protrudes from the play lever (16). 16a).

(16b) and the claw piece (17) formed on the rising wall surface (17).
a) and (17b), an arm piece (24a) is provided protruding from the inner edge side of this pinch lever (24), and an engagement pin (27) is provided protruding from the lower surface side of the tip end thereof. the main chassis (1) through the play lever (16).
) is protruded to the back side from a substantially inverted triangular window hole (1a) formed in the hole (1a).

Pinch roller (25) for this pinch lever (24)
).

The shaft support (26) is provided with U-shaped shaft supports (24b) and (24c) on both sides of the pinch lever (24), and the upper and lower support pieces (24bl), (24b2) and (24c+)
), (24cz) are formed thinly, and this elastic deflection is utilized to perform so-called para-thin fastening.

That is, as shown in FIGS. 4 and 5, pinch rollers (2
Circular protrusions (25a+), (25az) and (26a,
), (26a,) are provided protrudingly, while the supporting pieces (24b) and (24c) of the pinch lever (24) are
24b+), (24bz) and (24c+), (24
circular protrusion (25a, ) on the pinch roller shaft
, (25a z) and (26a+), (26az) are engaged with the shaft holes (24a, ), (24d z)
(24f +), (24f t) and (24g
+), (24gg), the tip of this groove is formed in a tapered shape, and the shaft hole is formed in a 0-shape with the groove side periphery being straight.

In this way, the shafts (25a) of the pinch rollers (25), (26).

(26a) and the pivot support (24b) of the pinch lever (24)
, (24c) by forming the pinch roller (
25), the shaft (25a) in the engagement shaft support of (26)
and the protrusion (25a+) of (26a).

(25az) and (26aυ, (26a2) are attached to the supporting pieces (24b, ) of the pivot supports (24b) and (24c), (
(24bz) and (24c+), (24cz) groove (2
4fl), (24f2) and (24g+), (24g
By engaging with g) and pushing along this groove, it is guided by this and falls into the shaft holes (24d+), (246z), (24e1), and (24ez) to be engaged and supported. .

In this engagement, since the groove side periphery of the shaft hole is straight, the range of contact with the edge when the shaft protrusion engages with the shaft hole while deflecting the support piece can be kept to a small extent. This allows for smooth engagement.

Here, if the shaft hole is formed so that the linear edge enters into the groove side, the range of contact with the protrusion of the shaft can be extremely reduced, and the engagement can be performed more smoothly.

In this case, a gap will be created between the protrusion of the shaft and the shaft hole, causing some play in the pinch roller, but when the pinch roller is pressed against the capstan, the protrusion of the shaft will Since it comes into contact with the arcuate inner peripheral edge of the pinch roller, it does not interfere with the rotation of the pinch roller.

The above-mentioned structure for supporting the pinch roller and the pinch lever can also be applied to the case where a gear is supported on a support arm or the like.

That is, in this case, a thin support piece is formed on the support arm or the like and supports both ends of the shaft of the gear, and a groove is formed from the edge toward the shaft hole, so that the peripheral edge of the groove side of the shaft hole is straight. It will be formed into a shape.

This configuration is applied to the shaft support of a gear for a fast forward lever and a rewind lever, which will be described later.

(28) is a switching lever disposed on the back side of the main chassis (1) so as to be slidable laterally, that is, in a direction orthogonal to the sliding direction of the play lever (16), and is on the side facing the reel shaft. A pair of engaging pawls () that sandwich the protrusion (10) of the above-mentioned pick-up lever (7) at a required interval approximately in the center of the edge of the
an engagement arm (29) having (29a), (29b);
A DIR lever (30) is provided at one end.
The protrusion (31) engaged with the shutoff lever (38)
) is provided with a protruding pawl (33) that engages with the pick-up lever (34
a) , (34b) are formed. A pair of leg pieces (35a) are located in the center of this switching lever (2nd).
), (35b) torsion coil spring (35)
The leg pieces (35a) and (35b) are attached so as to protrude from the front edge side at a required interval, and the tips (35aI) of both leg pieces (35a) and (35b)
), (35b,) are each bent outward, and the spaced portion thereof faces the engagement pin (27) of the pinch lever (24) described above.

This switching lever (28) is forcibly biased in the direction of movement of both tanks by a toggle spring (36).

DIR lever that switches this switching lever (28)
(30) is pivotally supported by the main chassis (1), and the tip thereof is provided with a required gap a between the protrusion (31) of the switching lever (28).
A concave engaging portion (30a) is formed to be engaged in a corresponding manner, and a pressing protrusion (30a) is formed on one side of the tip.
b) is provided protrudingly provided, and an arm piece (30
c) is provided protrudingly and the tip of the saw slides onto the convex part (37) provided on the main chassis (1), and the DIR
The lever (30) is adapted to be rotated in a click-stop manner.

(32) is a mode lever, which is pivoted on the main chassis (1) and has an engaging pawl (38a) corresponding to the pawl (33) of the switching lever (28).The shutoff lever (38) is a spring member (39). The shutoff lever (38) is movably supported by an engagement pin (40) protruding from the main chassis (1) and connected to the mode lever (3).
2) is moved toward and away from the switching lever (28) via the spring member (39), and in this approaching state, the engaging claw (38a) is opposed to the claw (33), Further, in this state, the pressing protrusion (30b) is engaged with the engagement claw (38a) by rotating the DIR lever (30) in one direction.

This mode lever (32) also has an arm piece (32a) protruding laterally from the shaft support, and the tip of this arm piece (32a) slides into contact with the main chassis (1) so as to ride over the convex part (41). The mode lever (32) is rotated in a click-stop manner.

In this example, the mode lever (32), the shutoff lever (38), and the spring member (39) are integrally molded from a resin material.

(42) is a lock plate, which is disposed on the back side of the main chassis (1) in parallel with the switching lever (28) so as to be able to slide in the horizontal direction. It is biased to lock the play lever (16), fast forward lever (44), and rewind lever (45) in the operating state, and is slid to release the lock by operating the operating lever (46). Lock plate (42)
A shut-off lever (32) is located at the end in the sliding direction of the
A pressed portion (42a) corresponding to the pressed portion is formed.

A gear (47) meshes with the gear (5) of the lower reel shaft (3) at the tip of the fast-forward lever (44), and a gear (47) meshes with the rewind gear (6) at the tip of the rewind lever (45). Gears (48) are each pivotally supported.

(49) is pivotally supported on the back side of the main chassis (1), and is integral with the flywheel (15) of the capstan (13) that corresponds to the lower reel shaft (3).
5a) and an intermediate gear (50) coaxially and integrally rotated with the interlocking gear (9), the detection gear meshes with the intermediate gear (50) and faces the back surface of the main chassis (1) as shown in FIG. An inner cam (51) is formed on the outer peripheral side of the surface, and an inner cam (51) is formed in the center.
An outer cam (52) is formed corresponding to the inner cam (51) and the outer cam (52), and a guide protrusion (53) is provided to protrude in the radial direction between the inner cam (51) and the outer cam (52). . This guide protrusion (53) is formed with a first guide part (53a) in the outer circumferential direction and a second guide part (53b) in the center direction.

(54) is the back side of the main chassis (1) and the detection gear (49).
) and the lower end (3) of the lower reel shaft (3).
The pickup lever is movably engaged with a), and the tip thereof is provided with an engaging protrusion (55) in the vertical direction, and the upper half of this lever is a guide recess (55) formed on the back surface of the main chassis (1).
56) so that its lower half faces the cam forming surface side of the detection gear (49), and the tip of the pickup lever (54) and the lower end of the lower reel shaft (3)
A tension coil spring, that is, a friction spring (57) is stretched between 3a) and is always biased toward the - direction.

Further, the guide recess (56) is formed from the vicinity of the shaft support of the detection gear (49) to the outer peripheral side, and the first and second guide parts (56a) and (56b) are formed in a branched shape.

In addition, the flywheels (14) and (15) fixed to the capstans (12) and (13) mentioned above and the drive pulley (5) attached to the motor shaft of the motor (58) are also included.
A rubber belt (not shown) is passed between the flywheel (14) and the flyhole (15) so that the flywheel (14) and the flyhole (15) are rotated in opposite directions.

Also, the rising wall surface (1) of the play lever (16) mentioned above is
As shown in FIG. 8, an engaging pin (61) with an enlarged head is protruded on the outer surface of the head (21).
The flexible wiring board (62) connected to the is provided with a large diameter through hole (63a) having approximately the same diameter as the head of the engagement pin (61),
A small-diameter through-hole portion (63b) having approximately the same diameter as the shaft portion forms a slit (63
A continuous engagement hole (63) is formed through the hole (c).

Then, with the head (21) attached to the play lever (16), the flexible wiring board (62) is folded back to the outside of the rising wall (17) and the engagement hole (63) is inserted into the engagement pin (61). It is fitted through the large-diameter through-hole (63a), passed through the slit (63e), and engaged at the small-diameter through-hole (63b) to be fixed.

Also, the head of the play lever (16) is attached to the third part.
As shown in FIG. 9 and FIG. 9, attachment holes (22c,) are formed in both side attachment portions (22c) and (22d) of the head holder (22).

(22dl) are fitted into protrusions (64a), (64
b) are provided protrudingly, and these protrusions (64a) and (64b)
Mounting parts on both sides (22e) and (22d) on the outside of the
An engaging portion (65a+) having a triangular cross section, with which the end edge of the engaging portion is engaged.
, (65b+) engaging pieces (65a), (6
5b) is provided protrudingly.

To attach the head (21) to this play lever (16), attach the head holder (22) to the attachment holes (22c l) on both side attachment parts (22c) and (22d).
, (22dl) to the protrusion (64a).

(64b) and push it in to open the mounting hole (22c +
), (22d +) are protrusions (64a), (64
b) and both side mounting parts (22c), (
The edges of the engagement pieces (65a) and (65b) are pushed in so as to contact the engagement parts (65a I) and (65bl) and press the engagement pieces (65a I) and (65bl) outward, and the engagement pieces ( 6
5a), the engaging part (65a+) due to the repulsive force of (65b)
, (65b+) are fixed by engaging with the upper surface side of the edge. This fastening is done by what is called a palatine fastening.

In addition, in this example, a pinch lever (24) is arranged on the top surface of the play lever (16), and the head (21) is inserted from above.
To install the protrusions (64a), (64b) and engagement piece (65a).

(65b) protrudes from horizontal long holes (24d) and (24e) formed in the pinch lever (24), and the head holder (22) is provided with protrusions (64a) on the upper side of the pinch lever (24). ), (64b) and engaging pieces (65a), (65b).

Figure 10 shows the other side of the pinch lever, and this pinch lever (124) has tape guides (125a) and (125b) protruding inwardly towards -1, sandwiching the portion where the head is arranged on the inner side. It is.

These tape guides (125a) and (125b) are inserted into the intermediate window between the central window where the head of the tape cassette is inserted and the windows on both sides where the pinch rollers are inserted, and guide the tape. The relationship between the head and both pinch rollers, that is, the position, can be easily determined, which is advantageous for tape buses.

Also, the pinch lever (124) has a tape guide (12
5a).

An erasing head may be attached instead of (125b), and in this case too, the erasing head will be inserted into the middle window of the tape cassette.

Next, to explain the operation of the cassette type tape deck of this embodiment constructed as described above, first, forward running will be explained, and then reverse running will be explained.

Forward running is based on the solid line and -dotted chain line in Figure 11 and the line in Figure 12.
As shown in Figure A, when the DIR lever (30) is rotated to the forward side (solid line side), the switching lever (2nd) changes to the protrusion (
31) to the left in the figure, and is held in this sliding position by a toggle spring (36). In this state, the pick-up lever (7) has a projection (10) on one of the engagement claws (
29b) and is pushed and rotated clockwise,
In this state, the protrusion (10) is brought into contact with the tip of the bent end (19a) of one of the guide claw pieces (19) of the play lever (16), and rotation is restricted, and the switching gear (8) at the outer end is ) is T
It is held close to the gear (5) of the side wheel shaft (3).

Therefore, when the play lever (16) is slid inward by pressing the operator (18), the guide claw piece (19)
The bent end (19a) of the pull-up lever (force prong (10)) is separated from the pull-up lever (7)
is released and is biased clockwise by the toggle spring (11), causing the switching gear (8) to mesh with the gear (5) of the T-side spindle (3) (Fig. 11 - indicated by the dotted chain line). situation).

On the other hand, the pinch lever (24) mounted on the play lever (16) is also moved inward together with the play lever (16), so that an engagement pin protrudes from the lower surface side of the arm piece (24a). (27) is one leg portion (35b) of the torsion coil spring (35) attached to the switching lever (28).
), the pinch lever (24) slides against the play lever (16) to the left by abutting and being guided by its bent tip (35b+), and as a result, the pinch lever (24) slides to the left with respect to the play lever (16), and the right pinch roller (26) is pressed against one corresponding capstan (13) by the biasing force of the torsion coil spring (35), resulting in a forward running state (FIG. 11 - dot-dashed line).

Next, to explain reverse driving, in this case, DI
Rotate the R lever (30) to the reverse side as shown by the two-dot chain line in FIG. 11 and B in FIG. 12.

By rotating this DIR lever (30) to the reverse side,
The switching lever (28) is pressed and slid to the right in the figure via the protrusion (31), and the toggle spring (36) is moved to this sliding position.
) is held by the reversal elasticity.

In this state, the pick-up lever (7) is rotated counterclockwise as the protrusion (10) engages with the other engagement claw (29a) of the engagement arm (29) of the switching lever (28). The projection (lO) is brought into contact with the tip of the bent end (20a) of the other guide claw piece (20) of the play lever (16), and rotation is restricted, and the switching gear (8) is S side reel shaft (2
) is held in close proximity to the rewinding gear (6) which meshes with the gear (4).

Furthermore, by sliding the switching lever (28) to the right, the torsion coil spring (35) is also moved to the right.

Therefore, when the play lever (16) is slid inward in the same way as in the forward travel operation described above, the guide claw piece (20)
The bent end (20a) of the pick-up lever (7) is separated from the projection (10) of the pick-up lever (7), and the regulation of the pick-up lever (7) is released and the toggle spring (11) rotates and biases the switch gear ( 8) is meshed with the rewind gear (6) (two-dot chain line in FIG. 11).

On the other hand, the pinch lever (24), which is moved inward together with the play lever (16), has its engagement pin (27) moved to the right side of the other leg portion (35a) of the torsion coil spring (35). ), its bent tip (35a + )
The pinch roller (25) on the left side is slid to the right by being guided and slid into contact with the pinch roller (25), and is pressed against the corresponding other capstan (12) by the biasing force of the torsion coil spring (35). It becomes reverse running state (first
Figure 1 (double-dashed line).

The above switching operation between forward travel and reverse travel can also be performed in the state where the play lever (16) is pressed and slid and locked, that is, in the play state.In this case, the forward switching operation, that is, the left side of the switching lever (28) At the same time as sliding, the switching gear (8) shifts to the gear (5) of the T-side slide shaft (3).
), the pinch lever (24) is slid to the left by the pressing elasticity of one leg (35b) of the torsion coil spring (35), and the right pinch roller (26) is engaged with one capstan (13). ) is pressed against.

Further, at the same time as the reverse switching operation, that is, the rightward sliding of the switching lever (28), the switching gear (8) is meshed with the rewinding gear (6) that is meshed with the gear (4) of the S-side reel shaft (2). At the same time, the pinch lever (24) is attached to a torsion coil spring (35).
) is slid to the right by the pressing elasticity of the other leg portion (35a), and the left pinch roller (25) is pressed against the other capstan (12).

The above forward play and reverse play operations are performed with the tape cassette loaded on the tape deck, that is, both reel shafts (2) and (3) are fitted into the reel hub, and both capstans (12) and (13) are inserted into the capstan. This is done while the device is inserted into the hole.

That is, when the DIR lever (30) is switched to the forward side or the reverse side and the play lever (16) is pressed and slid to be locked by the lock plate (42), the tape is moved between one capstan (13) and the pinch roller (26). , or the other capstan (12) and the pinch roller (25), and the head (21) is inserted into the tape cassette through the central window and comes into contact with the tape.

In this state, the motor (58) is driven and the capstan (
12) and (13) are flywheels (14) and (1
5), and the rotation of one flywheel (15) is transferred from the capstan gear (15a) to the detection gear (49) to the switching gear (8) of the pick-up lever (7). , intermediate gear (50), interlocking gear (
9), and the rotation of this switching gear (8) is T
The signal is transmitted to the side reel shaft (3) through the gear (5), and to the S side reel shaft (3) through the rewinding gear (6) and gear (4). Shaft (3) or S side reel shaft (2
) is rotated.

By rotating the T-side reel shaft (3) or the S-side reel shaft (2), the tape in the tape cassette is run forward or reverse.

As mentioned above, in this example, one pinch lever (2
4) is equipped with a pair of pinch rollers, that is, a reverse pinch roller (25) and a forward pinch roller (26) symmetrically, and slides this pinch lever (24) on the play lever (16) in the left-right direction. By sliding this pinch lever (24) in the left and right direction,
The reverse capstan (12) and the forward capstan (13) facing the pinch rollers (25) and (26) are switched between crimping and non-crimping. Additionally, the movement of the pinch lever (24) is controlled by the switching lever (28) used to switch the pick-up lever (7) that transmits rotation to the S-side reel shaft (2) and the T-side reel shaft (3).
) The engagement pin (27) is engaged with a torsion coil spring (35) serving as an engagement pressing means provided in the body.

In this way, one switching lever (2nd) is used for switching between forward travel and reverse travel. Furthermore, when stopping, that is, when the play lever (16) returns, the pinch lever (24) is separated from the torsion coil spring (35), so no reaction force from the pinch lever (24) is applied to the switching lever (28). , the play lever (16) returns smoothly without twisting or the like.

By returning this play lever (16), the pinch lever
In (24), the pinch lever (24) is slid to the neutral position when the engagement pin (27) is guided to the top of the inverted triangular guide hole (1a) provided in the main chassis (1). Ru. In addition, the tip portions (35aI) of both leg pieces (35a) and (35b) of the torsion coil spring (35), (
35b+) is bent outward, so that even if the DIR lever (30) is switched at the time of stopping, the pinch lever (24) is pushed and slid by the play lever (16) during the next play, so that the engagement pin (27) ) is guided by either leg of the torsion coil spring (35) and can smoothly slide in the switching direction of the switching lever (28).

In addition, the take-up lever (7) has a toggle spring (11)
By forcibly biasing the switching lever (28) in both rotational directions, the toggle mechanism does not need to be pushed all the way once it passes the dead center, and the stroke of the switching lever (28) is controlled by the stroke of the pick-up lever (7). This is so that the stroke of the switching lever (28) can be minimized, leading to effective use of space. This also leads to a margin in the stroke of the switching lever (28), so that the position of the pick-up lever (7) does not have to be influenced by the switching lever (28) during play operation and when stopping. Conversely, it is possible to avoid affecting the engagement of the switching gear (8).

Since the operation of the switching lever (28) and the take-up lever (7) is not affected by the position, the play lever (16) returns smoothly and the switching lever (28) position memory is changed. Directly set the lever (28) to DI
It can also be used for R display.

As described above, in this example, by rotating the DIR lever (30), the switching lever (28) is switched and slid to perform forward travel and reverse travel.

The shut-off operation is performed by operating the mode lever (32) as shown in FIG. It is switched to the continuous running side, which is repeated and continuous.

In one reciprocating driving mode in which the mode lever (32) continuously performs forward driving and reverse driving, the mode lever (32)
The shut-off lever (38) connected to the switch lever (39) by the spring member (39) is pushed inward, that is, in the direction of the switching lever (28), and the engaging claw (38a) at its tip engages the switching lever (
28) to a position where it engages with the pawl (33), and when the switching lever (28) moves from reverse to forward travel, the pawl (33) engages and presses the engagement pawl (38a), As a result, the shut-off lever (38) is rotated and presses the pressed portion (42a) of the lock plate (42), and the lock plate (42) is slid in the unlocking direction to release the lock of the play lever (16). When the play lever (16) is released, the play lever (16) is returned, that is, shut off.

By the way, the DIR lever (30) is the switching lever (28).
Since the switching lever (28) is not completely connected to the switching lever (
28) Switching from reverse driving to forward driving D
The problem with manual switching using the IR lever (30) is that the DI
When the R lever (30) is rotated, the pressing protrusion (30b) hits the rising piece (38b) of the shut-off lever (38) before the engaging part (30a) presses the protrusion (31). The shut-off lever (38) is pushed outward, that is, in the direction away from the switching lever (28), and the engagement claw (38a) at the tip thereof is moved out of the trajectory of the claw (33) of the switching lever (28). . For this reason, the shut-off lever (38) is set to the forward running position of the switching lever (28).
The IR lever (30) is not rotated during the switching movement, that is, no shutoff operation is performed.

Furthermore, when the mode lever (32) is switched to the continuous traveling side where forward traveling and reverse traveling are repeated, the shutoff lever (38) is moved by the spring member (39) to the switching lever (2).
8), the engagement pawl (38a) comes out of the trajectory of the pawl (33) of the switching lever (28), and the switching lever (28) is free to move in the forward running direction and the reverse running direction. Slide and lock lever (42)
is not unlocked, that is, is not shut off, and is in a state where forward running and reverse running are continuously repeated.

Next, the detection gear (49) and the pickup lever (54)
The mechanism for detecting tape end and automatically switching will be explained with reference to FIGS. 7 and 13.

In this configuration, the detection gear (49) is the capstan (
13), the pickup lever (54) is rotated in one direction via the capstan gear (15a), and the pickup lever (54)
It is swung by receiving the force in the rotational direction of the side rail shaft (3) via the friction spring (57).

That is, when the T-side slide shaft (3) is rotated in the forward running direction, the pickup lever (54) is moved so that the engagement protrusion (55) is inside the inner cam (51) of the detection gear (49). It slides into contact with the circumference and is swung within the range shown in Fig. 7 1-II,
In addition, when the T-side slide shaft (3) is rotated in the reverse running direction, the pickup lever (54) has an engagement protrusion (55) that slides on the outer periphery of the outer cam (52) of the detection gear (49). It is oscillated within the range shown in ■-■ in the same figure.

When the T-side slide shaft (3) stops at the tape end, the pickup lever (54) is moved to the ■ position in Figure 7 in the forward running state, and to the ■ position in the same figure in the reverse running state. position, that is, centered.

In this state, the detection gear (49) is further rotated, so the guide portion (53) protruding from the detection gear (49) moves the engagement protrusion (55) of the pickup lever (54) to the position (■). Kick-off is performed by the first guide portion (53a) when the vehicle is in the position (3), and by the second guide portion (53b) when the vehicle is in the position (3), thereby automatically switching between forward travel and reverse travel.

Here, the pickup lever (54) changes the centering position during forward running and reverse running, and also changes the kicking position by the guide protrusion (53), so that the upper end of the engagement protrusion (55) The pickup lever (54) is guided by the guide recess (56) formed in (1) and moved in two different directions, and the movement of the pickup lever (54) directly moves the pickup lever (54) left and right, that is, in the reverse running direction and the forward running direction. It is designed to switch to

The first guide part (56a) and the second guide part (56) of this guide recess (56)
The guide portions (56b) of the switching levers (28) have the first
and the second guide edges (34b) and (34a) correspond to each other.

That is, at the end of the forward travel, the pickup lever (54) centered at point 2 in FIG. The switching lever (28) is pressed in the direction of the first guide part (56a) of the guide recess (56) by the first guide part (53a), and is in a state facing the first guide part (56a). abuts against the first guide edge (34b) and presses the guide edge (34b), whereby the switching lever (28) is slid in the right direction, that is, in the reverse running direction;
Can be switched to reverse driving.

Furthermore, at the end of reverse travel, the pickup lever (54) centered at point ■ in FIG.
b) the second guide part (56b) of the guide recess (56)
The second guide edge (3) of the switching lever (28) is pressed in the direction of
4α] and press it, thereby switching the switching lever (28
) is slid in the left direction, that is, in the forward running direction, and is switched to forward running.

In the above configuration, the tension coil spring that takes the friction of the pickup lever (54), that is, the friction spring (57), is attached to the pickup lever (54).
It also serves as a return spring when pressed and moved by the guide protrusion (56) of the detection gear (49).

Furthermore, even if the tape is rewinded without being loaded, the T-side thread shaft (3) will not rotate, resulting in repeated switching operations.To prevent this,
The outer cam (52) of the detection gear (49) is prevented by the spring (7o) that prevents the pink-up lever (54) during play operation.
The play lever (
An engagement pin (71) protruding from the tip of the pin (16) pushes the prevention spring (70) away from the pink-up lever (54).

In this way, in this example, the traveling direction switching mechanism includes one detection gear (49) and one pickup lever (54).
) consists of extremely few parts.

〔Effect of the invention〕

As described above, according to the present invention, one pinch lever is symmetrically provided with a pair of pinch rollers corresponding to a pair of left and right capstans, and this pinch lever is connected to a head actuating member such as a play lever, This pinch lever is arranged to be slidable in a direction substantially perpendicular to the operating direction, and when the head operating member is operated, the pinch lever connects the S side reel shaft and the T side reel shaft.
The pinch roller is engaged with the switching lever that switches the driving force to the spindle via an engaging means, and is slid against the head member in response to the switching operation of the switching lever, so that one pinch roller is slid against the corresponding one of the pinch rollers. By configuring the pinch lever to be in pressure contact with the capstan, the pinch lever can be switched in pressure contact with the capstan, that is, tape running can be switched by operating the head and switching the driving force of the reel shaft, without having to operate the pinch lever independently. Therefore, there is no need for a pinch lever operating member as in the past, and the configuration is therefore simplified, the number of parts is reduced, and costs can be reduced, and the pinch roller can be securely pressed against the capstan. A cassette tape deck with good performance can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an example of a cassette tape deck according to the present invention, FIG. 2 is a back view, and FIG. 3 is a partially exploded perspective view.
Figure 4 is a plan view of a portion of the pinch lever, and Figure 5 is a partial plan view of the pinch lever.
6 is an exploded perspective view of a portion, FIG. 7 is a plan view of a portion, FIG. 8 is a perspective view of a portion of the play lever, FIG. 9 is a sectional view of the head mounting portion, and FIG. The figure is a perspective view of the other side of the pinch lever, and FIGS. 11 to 13 are operation explanatory views. In the figure, (1) is the main chassis, (2) and (3) are the reel shafts, (12) and (13) are the capstans, and (1)
6) is the play lever (24) is the pinch lever, (25)
, (26) is a pinch roller, (2nd) is a switching lever, (35) is a torsion spring as an engagement means, (3)
5a) and (35b) are leg pieces. Figure 4

Claims (1)

[Claims] 1. A pair of reel shafts, a pair of capstans that rotate in opposite directions, and a pinch lever in which a pair of pinch rollers corresponding to the pair of capstans are rotatably supported. , a play lever or a head operating member such as a head base that is moved in accordance with the movement of the play lever, and a switching lever that switches the reel shaft; The switching lever is mounted so as to be slidable in a direction substantially perpendicular to the operating direction of the member, and the switching lever is provided with an engaging means with which the pinch lever is engaged when the operating member is actuated; When the member is actuated, the pinch lever is slid through the engaging means in response to the switching operation of the switching lever, and the one pinch roller is pressed into contact with the corresponding one capstan. A cassette tape deck characterized by: 2. The cassette tape deck according to claim 1, wherein said engaging means is constituted by a single spring member having a pair of leg portions.