JPH0753154Y2 - Pinch roller crimping mechanism for tape player - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] A pinch roller of a tape reproducing device is pressed against a capstan by a spring force of a coil spring. This coil spring is arranged around the fulcrum shaft of the pinch roller holder, one end of which is locked to the pinch roller holder,
Moreover, the other end is adapted to be engaged with an operation control means such as a slide lever. The pinch roller holder has a substantially U-shaped cross section, a side wall portion corresponding to a vertical side of the U-shape is provided near the fulcrum shaft, and a claw portion is provided on the opposite side of the side wall portion. The coil spring is received by the side wall and the claw to prevent the coil spring from falling.

[Industrial application field]

The present invention relates to a pinch roller crimping mechanism of a tape reproducing device.

[Conventional technology]

The pinch roller of the tape reproducing device is rotatably supported by the pinch roller holder, and is pressed against the capstan by urging a coil spring arranged around a fulcrum shaft of the pinch roller holder. One end of this coil spring is locked to the pinch roller holder, and the other end is pushed by the operation control means. In this way, by pushing the other end of the coil spring, the pinch roller holder is rotated through the coil portion of the coil spring and the one end, and thus the pinch roller is pressed against the capstan by the spring force of the coil spring. Let As the operation control means, a trailing edge portion of the head base that moves forward and backward or a slide lever that can move laterally with respect to the head base may be used.

[Problems to be solved by the device]

The coil spring is arranged with play so as to be deformable around the fulcrum shaft of the pinch roller holder. Both ends of the coil spring are located at the upper and lower ends of the coil portion.
Therefore, when the lower end of the coil spring is pushed, the coil spring rotates to generate a spring force, and the coil spring falls over the fulcrum shaft. When the coil spring falls down with respect to the fulcrum shaft, the coil spring will twist the fulcrum shaft and the pinch roller holder, and the operation force of the operation control means must be increased to push the lower end of the coil spring. there were.

The present invention was made to solve the above problems,
It is an object of the present invention to provide a pinch roller crimping mechanism of a tape reproducing device provided with means for preventing the coil spring from falling.

[Means for Solving the Problems]

A pinch roller crimping mechanism of a tape reproducing apparatus according to the present invention includes a pinch roller holder rotatably supporting the pinch roller, and a pinch roller holder rotatable about a fulcrum shaft for crimping the pinch roller to a capstan. A coil spring arranged around a fulcrum shaft, one end of which is locked to the pinch roller holder, and operation control capable of engaging with the other end of the coil spring to press the pinch roller to the capstan. The pinch roller holder connects the upper wall portion and the lower wall portion, which are substantially parallel to each other, having a hole for passing the fulcrum shaft, and the upper wall portion and the lower wall portion in the vicinity of the fulcrum shaft. And a claw that extends substantially parallel to the side wall portion from at least one of the upper wall portion and the lower wall portion on the side opposite to the side wall portion, and includes at least a position near the other end portion of the coil spring. Has the door, is characterized in that it has to receive the coil spring in a side wall portion and the claw portion.

[Operation] In the above configuration, since the side wall portion is provided in the vicinity of the fulcrum shaft of the pinch roller holder and the claw portion is provided on the opposite side of the side wall portion, the side wall portion and the claw portion receive the coil spring, Prevent the coil spring from falling. If the coil springs are arranged along the direction in which the coil spring receives the operating force of the operation control means, the side wall portion and the claw portion have a great fall prevention effect. Further, a plurality of claw portions may be provided so as to surround the coil spring.

〔Example〕

FIG. 4 shows the inside of the tape reproducing apparatus and shows each member such as a pinch roller arranged on the front surface side of a horizontal holder plate 10 forming a part of a gantry. Fig. 5 shows the holder plate
FIG. 6 is a view showing an operation control member such as a gear train and a slide lever arranged on the bottom surface side of 10. Pins are holder plate 10
And extends through in the vertical direction to connect the member shown in FIG. 4 and the member shown in FIG.

Referring to FIG. 4, the magnetic head 12 is supported by a substantially rectangular head base 14. The head base 14 is spring-loaded on a head base drive lever 16 driven by an electric motor (not shown).
It is connected via 18 and can move forward in the direction of arrow A and back in the opposite direction. When the head base 14 is advanced in the direction of arrow A, the magnetic head 12 comes to the play position where it contacts the tape. When the electromagnetic plunger (not shown) is operated from this advanced play position, the spring
It is possible to set the head base 14 in a fast forward or rewind position slightly retracted against the 18 position. Take-up reels 20 and 22 for receiving the tape spool of the cassette pack are arranged on the front surface side of the holder plate 10. The take-up reels 20 and 22 extend to the bottom surface side of the holder plate 10 through the holes provided in the holder plate 10 and the head base 14, and on the bottom surface side of the holder plate 10, the reel drive gears 24 and 26 are wound respectively. It is mounted coaxially on reels 20 and 22. These reel driving gears 24 and 26 can engage with the driving gears located on the bottom side of the holder plate 10 as shown in FIG.

Furthermore, on the front side of the holder plate 10, the capstan 2
8, 30 and pinch rollers 32, 34 are provided. The pinch rollers 32, 34 are rotatably supported by respective pinch roller holders 36, 38, and the pinch roller holders 36, 38 are rotatably attached to respective fulcrum shafts 40 set up on the holder plate 10. Around the fulcrum shaft 40, coil springs 42,4
4 is placed. A fulcrum shaft 40 is attached to the head base 14 that moves forward and backward.
An elongated hole 14a is provided to prevent interference with the.

1 to 3 are diagrams showing the pinch roller 32 and the pinch roller holder 36 in detail. The other pinch roller
The structures of the pinch roller holder 34 and the pinch roller holder 38 are the same as those shown in FIG. 4, except that the pinch roller holders 36 and 38 are arranged so as to face each other. It is similar to the structure of. The pinch roller holder 36 includes a parallel and horizontal upper wall portion 36a and a lower wall portion 3
6b, and vertical side walls 36c and 36d connect the upper wall 36a and the lower wall 36b. Pinch roller 32 support shaft 32a
And the fulcrum shaft 40 of the pinch roller holder 36 is the upper wall portion of these.
36a and the lower wall portion 36b are penetrated and extend in parallel. The coil spring 42 is arranged around the fulcrum shaft 40. These side wall portions 36c and 36d are on the same side as shown in FIGS. 1 and 2, and the pinch roller holder 36 can be formed by pressing and bending a thin plate material. One of the side wall portions 36c and 36d, that is, the side wall portion 3
6d is near the fulcrum axis 40.

One end portion of the coil spring 42, that is, the upper end portion 42a connected to the upper end portion of the vertically arranged coil portion has a vertical side wall portion 36c.
Is locked to a locking wall 36e extending in the lateral direction. further,
A storage portion wall 36f is provided upward from the lower wall portion 36b of the pinch roller holder 36. The storage wall 36f is a horizontal projection 36.
Including g. The other end portion of the coil spring 42, that is, the lower end portion 42b connected to the lower end side of the coil portion, extends below the horizontal projecting portion 36g of the storage wall portion 36f to the outside, and is a pin set up on the operation control slide lever 64. It can be engaged with 64e. This slide lever 64 is movable in the direction of arrow B for channel switching, as will be described in detail later, and at least the lower end portion 42b of the coil spring 42 is engaged with the pin 64e in the direction of arrow B. It is formed so as to extend in a direction substantially orthogonal thereto.

Further, the claw portions 36x and 36y are provided so as to face each other from the upper wall portion 36a and the lower wall portion 36b. These claw portions 36x and 36y are located on the opposite side of the side wall portion 36d and extend substantially parallel to the side wall portion 35d. Side wall 36d and claws 36x, 36y are almost coil springs
The coil spring 42 is arranged at a distance slightly larger than the diameter of the coil spring 42 on the extension line of the diameter of 42, and cooperates to receive the coil spring 42 between them.
Prevent it from falling. The coil spring 42 tends to fall when receiving a force from the pin 64e of the slide lever 64. That is, the lower part of the coil part moves to one side and the upper part moves in the opposite direction, but the side wall part 36d and the claw parts 36x, 36y are in the direction of such force acting, and the coil spring is The coil spring 42 is prevented from falling down by restricting the movement of the lower part and the upper part of 42.

Furthermore, another pair of claws 36p and 36q are provided on the upper wall 36a and the lower wall 36a.
It is provided at a position between the side wall 36d and the claws 36x, 36y from b,
Therefore, the side wall portion 36d, the claw portions 36x and 36y, and the claw portions 36p and 36q are arranged so as to surround the coil spring 42. These claw portions 36x, 36y and claw portions 36p, 36q can be formed at the same time when the pinch roller holder 36 is pressed and bent.

FIG. 4 shows a part of the lower right side of the head base 14 in a cutaway view to show the carrier 48 positioned in a layer between the head base 14 and the holder plate 10. The carrier 48 is rotatably supported by a fulcrum shaft 48a set up on the holder plate 10, and a low speed drive gear 50 is supported at one end thereof. The spring 52 drives the carrier 48 and the low speed drive gear 50 operates the reel drive gear 26.
Is urged in the direction to engage with. The other low speed drive gear 54 is also shown in dashed lines and is also supported by a similar carrier (not shown). The pinch roller holder 38 is shown in broken lines to show its relationship with the carrier 48.
Further, the lower wall portion 3 is provided in the middle portion of the pinch roller holders 36 and 38.
Pins 36h and 38h extending downward from 6b are provided. Each downward pin 36h, 38h passes through an elongated hole 48b provided in each carrier 48. Therefore, each carrier 48 has a pinch roller holder 36, 38.
Will be connected with. Each downward pin 36h, 38h
Further engages with a slide lever 64 on the bottom surface side of the holder plate 10, which will be described later, through a hole provided in the holder plate 10.

A flywheel (not shown) is attached to the capstans 28, 30 and is connected to a tape driving electric motor (not shown) by a belt. Two-stage drive gears 56 and 58 are provided coaxially with the flywheel.

Referring to FIG. 5, on the bottom surface side of the holder plate 10, the reel driving gears 24 and 26 and the low speed driving gears 50 and 5 described above are provided.
4, and two-stage drive gears 56, 5 coaxial with the capstans 28, 30
8 is shown. In addition, high speed drive gears 60a, 60b, 6
The carrier 62 is provided upward with 0c and 60d continuously engaged. The carrier 62 is rotatably supported by a fulcrum shaft 62a standing on the holder plate 10. Similar to the two-stage drive gears 56 and 58 coaxial with the capstans 28 and 30, the reel drive gears 24 and 26 also include two-stage gears 24a, 24b, 26a and 26b, respectively.

FIG. 5 shows a two-stage drive gear 5 coaxial with the capstans 28 and 30.
Smaller gear 56,56 of 6,58, low speed drive gear 5
0, 54 and reel drive gear 24, 26, the larger gear 24
The 1st plane where a and 26a are arranged is shown. The low speed drive gears 50, 54 are respectively arranged between the drive gears 56, 56 and the reel drive gears 24a, 26a, and by moving the carrier 48, the reel drive gears 24a, 26a are engaged, Or they will come apart.

Further, the remaining gears are the second gears on the upper layer from the first plane of FIG.
It is placed on a plane. That is, the larger drive gears 58, 58 coaxial with the capstans 28, 30 and the high-speed drive gears 60a, 60b, 60
c, 60d, and the larger gear 24 of the reel drive gears 24, 26
b and 26b are arranged on the second plane. Carrier 62 is fulcrum shaft 6
2a is rotatably supported, and when the carrier 62 rotates clockwise, for example, in FIG.
Larger gear 58 with 60d coaxial with one capstan 30
And the last drive gear 60a of the high speed drive gears 60d, 60c, 60b, 60a is engaged with one reel drive gear 24b.
On the contrary, when the carrier 62 rotates counterclockwise in FIG. 2, the high-speed drive gear 60a causes the other capstan 28 to rotate.
Drive gear for high speed, engaging with the larger gear 58 coaxial with
The last drive gear 60d of 60a, 60b, 60c, 60d engages with the other reel drive gear 26b. Then, the carrier 62 can be in the neutral position, and in the neutral position, the high-speed drive gears 60a, 60d are either reel drive gears 24b, 26b.
Does not engage.

As shown in FIG. 5, the slide lever 64 is arranged on the bottom surface side of the holder plate 10. The head base 14 moves in the direction indicated by the arrow A, while the slide lever 64 is provided so as to be movable in the lateral direction of the head base 14 indicated by the arrow B, and is linearly moved by a suitable guide (not shown). You will be guided in the direction. The carrier intermediate lever 66 is provided so as to be orthogonal to the slide lever 64 substantially at the center thereof. The carrier intermediate lever 66 is rotatably supported by a fulcrum shaft 66a which is erected on the holder plate 10, and one end of which is a connecting pin 68.
By carrier 62. The connecting pin 68 is mounted downward on the carrier 62 and engages with a slot provided at the end of the carrier intermediate lever 66, and thus the carrier 62.
When is rotated by the carrier intermediate lever 66, the connecting pin 68 can move in an arc around the fulcrum shaft 62a of the carrier 62.

The connecting pin 68 passes through an arcuate hole provided in the holder plate 10, and further has a fan-shaped hole 70 (fourth hole) provided in the head base 14.
Inserted). A locking recess 70a is provided on the peripheral surface of the fan-shaped hole 70 on the rear end side. When the head platform 14 is in the play position advanced in the direction indicated by the arrow A, the connecting pin 68 enters the locking recess 70a, so that the connecting pin 68 is substantially immovable. Therefore, even if the carrier 62 and the carrier intermediate lever 66 try to rotate, the connecting pin 68
Acts as a lock to maintain carrier 62 in the neutral position. Thus, when the head base 14 is in the play position, one of the low speed drive gears 50, 54 engages with the associated reel drive gear 24a, 26a. Further, when the head base 14 is slightly retracted to, for example, the rewinding position, the connecting pin 68 comes out of the locking recess 70a and enters the fan-shaped hole 70 to allow the rotation of the carrier 62 and drive gears 60a, 60b for high speed. , 60c, 60d can be activated. Then, at this time, the predetermined portion of the rear end of the head base 14 which is retracted is the pinch roller holder 3
Push pins 36h, 38h of 6,38 backwards to bring them into the inoperative position.

Attached to the other end of the carrier intermediate lever 66 is a substantially U-shaped wire 72 which is rigid and flexible. For this reason, the seat 74 for stopping the intermediate portion of the U-shaped wire 72 is provided around the fulcrum shaft 66a of the carrier intermediate lever 66.
Are formed. The tip of the wire 72 has a slide lever 64
It is arranged so as to extend to the tip of the rear edge portion and straddle the upright piece 76 provided at the rear edge portion of the slide lever 64. Therefore, when the slide lever 64 is moved upward in FIG. 5, for example, the upright piece 76 pushes the upper leg portion of the U-shaped wire 72, and thus the carrier intermediate lever 66 from the slide lever 64 via the wire 72. Can be rotated. Connecting pin
Since the carrier intermediate lever 66 cannot rotate when 68 is in the locking recess 70a, when the upright piece 76 pushes the wire 72 when the slide lever 64 is moved, the wire 72 bends to cause relative movement. Absorb.

The slide lever 64 is provided with four cam holes 64a, 64b, 64c, 64d. Each of the cam holes 64a, 64b, 64c, 64d has an operating portion that is depressed in the direction of arrow A and a linear prohibiting portion that extends rearward. Pinch roller holder 3 in the cam holes 64a and 64d on both ends.
Pins 36h and 38h of 6,38 are engaged. Also, the central cam hole 64
Pins 78b and 80b of brake pieces 78 and 80, which will be described
Engage. When each pin is located in the depressed operating portion, the pin can move in the direction of arrow A. When each pin is in the prohibited portion, the pin cannot move in the direction of arrow A.

Brake pieces 78 and 80 are arranged on both sides of the carrier intermediate lever 66 in parallel with the carrier intermediate lever 66. Brake piece 78,8
The tip of 0 is the reel drive gears 24, 26 (the larger gear 24a,
26a), and when the brake pieces 78, 80 are moved forward, they can come into contact with the reel driving gears 24, 26 to utilize the brakes. Rear end portions 7 of the brake pieces 78, 80 extending in a straight line
8a and 80a are inserted into guide grooves provided in the holder plate 10, pass under the slide lever 64, and reach the two central cam holes 64b and 64c. Brake piece 78, 80 Rear end 78
The a and 80a are provided with upward pins 78b and 80b, and the upward pins 78b and 80b engage with the cam holes 64b and 64c, respectively.
Further, the brake pieces 78, 80 are urged by the springs 82, 84 toward the reel driving gears 24, 26. The brake pieces 78, 80 are moved forward when the upward pins 78b, 80b are located in the operating portions of the cam holes 64b, 64c, and are maintained in the retracted positions when they are in the prohibited portions.

Further, the holder plate 10 has pinch roller holders 36, 3
Slotted holes 10a and 10b are provided near 8. Pins 64e and 64f for controlling the operation of the pinch roller holders 36 and 38 are the slide levers.
64, and the long holes 10a, 10
Coil spring of pinch roller holder 36, 38 through b
It is adapted to engage with the lower ends 42b (42 of FIGS. 1 to 3) of 42,44.

Further, the slit 10 is provided near the rear end of the holder plate 10.
c is provided, and the slide lever 64 is provided with a lever connecting hole 64g associated with the slit 10c. The connecting lever 102 driven by an electric motor (not shown) is inserted into the lever connecting hole 64g, so that the slide lever 64 can be moved to the right position, the neutral position, or the left position.

Next, the operation will be described.

When the head base 14 is in the advanced play position, the connecting pin 68 is in the locking recess 70a, the carrier 62 is maintained in the neutral position, and the high speed drive gears 60a, 60b, 60c, 60d do not operate.

When the slide lever 64 is at the left position in FIG. 4, the pin 64e on the right side of the slide lever 64 passes through the elongated hole 10a of the holder plate 10 and passes through the pinch roller holder 36 on the right side.
The lower end portion 42b of the coil spring 42 is pushed leftward (the direction of arrow B in FIG. 1). Then the coil spring
42 rotates the pinch roller holder 36 in a clockwise direction to bring the pinch roller 32 into contact with the associated capstan 28. At this time, the pin 36h extending from the lower wall portion 36b of the pinch roller holder 36 is attached to the cam hole 6 on the left end side of the slide lever 64.
Engagement with the actuating portion of 4a, the carrier 48 is also rotated by the pin 36h to engage the low speed drive gear 54 with the associated reel drive gear 24.

As shown in FIG. 4, the pinch roller holders 36, 38 are mounted so as to face each other, and when the slide lever 64 is in the left position in FIG. 4, the pin 64f on the left side of the slide lever 64 is It will operate in a direction away from the end of the coil spring 44 of the associated pinch roller holder 38. Therefore, the coil spring 44 is free from the rotational force and is free. At this time, pinch roller holder
A pin 38h extending from the bottom wall of 38 engages the prohibition of the associated cam hole 64d of the slide lever 64, thus bringing the pinch roller holder 38 and carrier 48 into the inoperative position. Therefore, the pinch roller 34 is attached to the associated capstan.
No contact with 30, and the low speed drive gear 50 also does not engage with the associated reel drive gear 26.

This relationship is reversed when the slide lever 64 moves from the right position through the neutral position to the left position. And
During the movement of the slide lever 64, two brake pieces 7
8,80 operate sequentially.

In this way, the pins 64e and 64f of the slide lever 64 are connected to the lower ends 42 of the coil springs 42 and 44 of the pinch roller holders 36 and 38.
Press b at a right angle or use coil springs 42,44
It operates so as to retract until it is separated from the lower end portion 42b of the.
Since the coil springs 42 and 44 are simply arranged around the fulcrum shaft 40, their postures change when they receive a force or when the received force is removed. In the present invention, the side wall portion 36d of the pinch rollers 36 and 38, the claw portions 36x and 36y, and the claw portion 36.
p and 36q prevent the coil springs 42 and 44 from collapsing, the coil springs 42 and 44 can be operated by the pins 64e and 64f of the slide lever 64 without being dragged, and the coil springs 42 and 44 interfere with the fulcrum shaft 40, etc. It is possible to reduce. Therefore, even with the slide lever 64 that engages with many pins including channel switching as described above, the operating force of the slide lever 64 does not have to be excessively increased.

[Effect of device]

As described above, according to the present invention, a pinch roller holder rotatably supported and rotatable about a fulcrum shaft to press the pinch roller against a capstan, and the fulcrum. Placed around the axis,
The pinch roller is provided with a coil spring whose one end is locked to the pinch roller holder, and operation control means engageable with the other end of the coil spring to press the pinch roller to the capstan. A holder has substantially parallel upper and lower wall portions provided with holes through which the fulcrum shaft passes, a side wall portion connecting the upper wall portion and the lower wall portion in the vicinity of the fulcrum shaft, and the side wall portion. On the opposite side of the coil spring from at least one of the upper wall portion and the lower wall portion, extending substantially parallel to the side wall portion and including at least a position near the other end portion of the coil spring. Since the side wall portion and the claw portion receive the coil spring, it is possible to prevent the coil spring from falling down, and it is not necessary to excessively increase the operating force of the operation control slide lever.

[Brief description of drawings]

1 is an enlarged view of the pinch roller holder shown in FIG. 4, FIG. 2 is a front view of the pinch roller holder seen from the arrow II in FIG. 1, and FIG. 3 is a rear view of the pinch roller holder shown in FIG. FIG. 4 is a plan view showing the inside of the tape reproducing apparatus of the present invention, and FIG. 5 is a bottom view of FIG. 12 …… magnetic head, 14 …… head stand, 20,22 …… winding roll, 28,30 …… capstan, 32,34 …… pinch roller, 36,38 …… pinch roller holder, 40 …… fulcrum Axis, 42,
44 …… Coil spring, 64 …… Slide lever, 64x,
64y …… Claws, 64p, 64q …… Claws.

Claims (1)

[Scope of utility model registration request] 1. A pinch roller holder rotatably supporting a pinch roller and rotatable about a fulcrum shaft to press the pinch roller against a capstan, and the pinch roller holder is arranged around the fulcrum shaft, The pinch roller is provided with a coil spring whose one end is locked to the pinch roller holder, and operation control means engageable with the other end of the coil spring to press the pinch roller to the capstan. A holder has substantially parallel upper and lower wall portions provided with holes through which the fulcrum shaft passes, a side wall portion connecting the upper wall portion and the lower wall portion in the vicinity of the fulcrum shaft, and the side wall portion. On the opposite side of the coil spring from at least one of the upper wall portion and the lower wall portion, extending substantially parallel to the side wall portion and including at least a position near the other end portion of the coil spring. Side wall Pinch roller pressing mechanism of the tape reproducing apparatus adapted to receive at the claw portion.