JPH0550550U - Door holder opening / closing device - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a door holder opening / closing device capable of obtaining a stroke larger than a radius in a cassette tape recording / reproducing device and downsizing a cam gear. [Structure] Door holders 2 for holding a cassette tape in a play position are supported on both sides of a mechanical chassis 1 and resist an urging force of a spring 3 in an eject direction to cause an eject arm 4 to move a second cam 5b of a cam gear 5b. And the hook portion 6c of the eject lever 6 and the projection 2b engage with each other to lock the door holder 2 in the play position. When the eject knob is pressed, the loading motor 7 rotates counterclockwise, the cam gear 5 is rotated clockwise by the gear 9a via the square belt 8 and the gear pulley 9, and the eject lever 6 is operated to open the door holder 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a door holder for a cassette tape recording / reproducing apparatus, and more particularly to a door holder opening / closing apparatus that opens / closes by a motor.

[0002]

[Prior art]

 A conventional door holder opening / closing device will be described with reference to FIG.

In the figure, reference numeral 21 denotes a mechanical chassis of a cassette mechanism that drives a cassette tape, and a third switch, which is operated by being in pressure contact with the tape cassette, is rotatably provided on an upper portion of the mechanical chassis. Reference numeral 22 denotes a switch, which is urged by a spring (not shown) so that the actuator portion is pressed against the cassette tape 33. A plurality of tapes are provided on the top of the mechanism 21 at positions facing the claws for preventing erroneous recording provided on the cassette tape 33 and the recesses indicating the tape type.

A loading motor 23 has a worm 23a fixed to the output shaft, and the worm 23a and the cam gear mesh with each other. Reference numeral 24 denotes a cam gear, which is rotatably supported beside the mechanical chassis 21 about a shaft 24c and is driven by a worm 23a meshed with outer peripheral teeth. A cam 24b for opening and closing the door holder is provided integrally with the cam gear 24 on the inside (mechanical chassis side), and a cam 24a for operating the eject lever is provided integrally with the cam gear 24 on the outside.

Reference numeral 25 denotes an eject lever, which is rotatably supported by a shaft 25a as a fulcrum, and has an operating portion 25b that is in sliding contact with the cam 24a, a hook portion 25c that locks the door holder, and an arc-shaped inclined portion at the top of the hook portion 25c. A protrusion 25d that pushes up the switch 25e and the switch release plate is provided, and is biased counterclockwise by the spring 26 so that the lock cannot be released. Reference numeral 27 denotes a switch release plate, which is pushed up from below to rotate the switch 22 in the clockwise direction.

Reference numeral 28 denotes a door holder, which is rotatably supported by a sub-panel (not shown) with a boss 28a as a fulcrum, and is urged in a counterclockwise direction by a spring 29 so that a cassette tape 33 can be stored therein. Attach to. A semi-circular protrusion 28b that engages with the hook 25c of the eject lever 25 on the side to lock the door holder in the play position, a pin 28d and a switch that slidably contact the cam 24b at the tip of the lower arm 28c. An actuating part 28c is provided for actuation.

A switch 30 is connected to the control unit. When the door holder 28 is actuated by the actuating portion 28e and the door holder 28 is locked at the play position, the on or off state is maintained, and when the lock is released and the door holder is rotated, it is turned on or off. Reference numeral 31 is a control unit, which is configured by using a microcomputer, operates by the operation of the switch 30 and the switch 32, and controls the driving of the loading motor 23. Reference numeral 32 denotes a switch, which is connected to the control unit 31 and is operated in association with an eject key (not shown). 33 is a cassette tape, and a claw for preventing erroneous recording and a recess for identifying the type of tape are provided on the rear surface of the cassette half.

In the above-described configuration, in the door holder opening / closing device of the conventional example, when the door holder 28 locked at the play position is opened, the control unit 31 is operated by operating the switch 32 to rotate the loading motor 23. .. As a result, the worm 23a rotates the cam gear 24 in the counterclockwise direction, so that the actuating portion 25b of the eject lever 25 is actuated by the cam 24a and pivots in the clockwise direction to unlock the door holder 28. The door holder 28 is rotated counterclockwise by the elastic force of the spring 29, and is opened by a predetermined angle and stopped while the second cam 24b and the pin 28d are in contact with each other. When the door holder 28 starts to open, the switch 30 operated by the operation unit 28e operates and outputs an off or on signal. Receiving this output signal, the control unit 31 stops the rotation of the loading motor 23 after a predetermined time.

Next, when the door holder 28 in the opened state is closed, the switch 32 is operated and the loading motor 23 is rotated by the control output of the control unit 31, and the cam gear 24 is rotated through the worm 23a in the same counterclockwise time as when ejected. Rotate in the direction. The door holder 28 is rotated to the play position by the pin 28d of the door holder 28 which is in sliding contact with the cam 24b. While rotating, the protrusion 28b of the door holder 28 and the inclined portion 25e of the eject lever 25 come into contact with each other, and the upward component force acting on this inclined portion 25e causes the eject lever 25 to resist the biasing force of the spring 29. The door holder 28 is locked in the play position by turning slightly clockwise and engaging the protrusion 28b and the hook 25c.

When the door holder 28 reaches the play position, the operating portion 28 e provided at the tip of the arm portion 28 c actuates the first switch 30 to output an ON or OFF signal. After receiving this output signal, the loading motor 23 is rotated and stopped for a predetermined time until the hook portion 25c of the eject lever 25 engages with the protruding portion 28b of the door holder 28 and is locked.

When the eject lever 25 rotates clockwise to unlock the door holder 28, the switch release plate 27 is pushed up by the projection 25d provided on the eject lever 25. The switch release plate 27 flips up the switch 22 to release the pressure contact state between the cassette tape 33 and the switch 22.

Since the door holder 28 and the eject lever 25 are not subject to the rules of the cams 24a and 24b with respect to the clockwise rotation, the door holder 28 in the opened state can be pushed by hand.

[0013]

[Problems to be solved by the device]

 However, in the above-mentioned conventional door holder opening / closing device, the stroke of the cam cannot be larger than the radius of the cam gear. Therefore, in order to obtain the necessary stroke, the cam gear must be made large, which is disadvantageous in terms of configuration. The parts cost was also high.

The present invention has been made in view of the above points, and an object thereof is to solve the drawbacks of the conventional example, to obtain a stroke larger than the radius, and to open / close a door holder capable of reducing the size of a cam gear. It is in the area of providing equipment.

[0015]

[Means for Solving the Problems]

 The door holder opening / closing device of the present invention is configured so that the door holder, which is rotatably supported and holds the cassette tape at the play position, is rotationally biased in the cassette eject direction to lock the door holder at the play position. In a door holder opening / closing device of a tape recording / reproducing apparatus, an eject arm is fixed to the side of the door holder toward the rear, and a cam gear having cams on both sides of the gear is rotatably provided on the side of the mechanical chassis. A first cam for operating the rotatable eject lever is provided on the inner diameter portion of one surface, and a second cam for operating the eject arm is integrally provided on the outer diameter portion of the other surface to rotate the cam gear. By rotating the eject lever abutting on the first cam to unlock the door holder, and The eject arm is actuated by a cam to open the door holder.

Further, a third cam is provided on one surface of the cam gear so as to be symmetrical to the second cam, and a first switch operated by the third cam is arranged on the mechanical chassis. A second switch operated by the opening / closing operation of the door holder is arranged on the door holder to detect the positions of the cam gear and the door holder, respectively.

Further, the cam gear is meshed with a gear provided in an inner diameter portion of the gear pulley, and the gear pulley is driven by a motor.

[0018]

[Action]

 According to this invention, the first cam and the second cam are provided on both sides of the cam gear rotatably supported on the side portion of the mechanical chassis, and the first cam and the lock lever are brought into contact with each other, Since the eject arm fixed to the door holder is brought into contact with the second cam, when the cam gear is rotationally driven in the clockwise direction, the lock lever is actuated by the first cam and the engagement with the door holder is released. The second cam activates the eject arm to open the door holder. The door holder is closed by reversing the cam gear, and the lock lever locks the door holder.

In addition, a first switch operated by a third cam provided symmetrically to the second cam and a second switch operated by an opening / closing operation of the door holder are provided, and a cam gear is provided. The position of each door holder is detected.

Further, the cam gear is driven via a gear pulley driven by a belt by a motor and a gear provided in an inner diameter portion of the gear pulley.

[0021]

【Example】

 An embodiment of a door holder opening / closing device according to the present invention will be described with reference to FIGS.

In the figure, 1 is a mechanical chassis, and a cam gear and a gear pulley are rotatably supported on the left side portion 1a. Reference numeral 1b denotes a motor mounting portion which is further protruded from the left side portion 1a and vertically raised.

Reference numeral 2 denotes a door holder, which is rotatably supported by the left side portion 1a of the mechanical chassis 1 and the front portion of the lower right portion with bosses 2d provided on the left and right sides as a fulcrum, and is urged by a spring 3 in the eject direction. It is urged to rotate in the (clockwise direction) and stores the cassette tape 33 shown in FIG. 3 and holds it in the play position. The left side portion 2a is provided with a rectangular protrusion 2b that engages with the hook portion of the eject lever and locks the door holder at the play position, and the lower arm portion 2c is provided with a second switch.

Reference numeral 4 denotes an eject arm, which is attached to the left side portion 2a of the door holder 2 with a screw, and which is an operating portion formed as a flat surface through one side (rear surface) of the cam gear to the other surface (front surface). 4a is pressed against the second cam to operate.

Reference numeral 5 denotes a cam gear, which is rotatably supported on an upper portion of the left side portion 1 a of the mechanical chassis 1 and is driven by a loading motor via a gear pulley and a belt meshed with outer peripheral teeth. A first cam 5a for rotating the eject lever is integrally provided on the back surface so as to project to the inner diameter portion, and a third cam 5c having the same position and shape symmetrically to the second cam is provided on the outer diameter portion. A second cam 5b that operates the eject arm 4 and opens and closes the door holder 2 is integrally provided on the surface so as to project to the outer diameter portion.

Reference numeral 6 denotes an eject lever, which is rotatably supported by an integrally provided shaft 6a and is urged to rotate clockwise by a spring (not shown). A boss 6b is projectingly provided on the tip end and is in contact with the first cam. 6c is a hook portion, which engages with the protrusion 2b. 6d is an inclined part.

A loading motor 7 capable of rotating in the forward and reverse directions drives a gear pulley by mounting a square belt 8 between a pulley 7a fixed to a rotating shaft and a gear pulley.

Reference numeral 9 denotes a gear pulley, which is rotatably supported by a shaft 1c erected on the left side portion 1a, is provided with a groove for a belt on an outer peripheral portion, and a gear 9a and a cam gear 5 which are integrally provided on the back side of the inner diameter portion are meshed with each other. I'm doing it. A first switch 10 is attached to the left side portion 1a, is located between the cam gear 5 and the left side portion 1a, and is operated by the third cam 5c to detect the position of the second cam 5b. Reference numeral 11 denotes a second switch for detecting the position of the door holder 2, which is attached to the arm portion 2c and is operated when the door holder 2 is opened or closed.

In the door holder opening / closing device of the present invention having the above-described configuration, when the door holder 2 locked in the play position is opened, the eject switch (not shown) is pushed to cause the first switch 10 and the second switch 10 to move. The loading motor 7 rotates counterclockwise under the condition that both the switches 11 are turned on, and the cam gear 5 is rotated clockwise through the square belt 8 and the gear pulley 9.

As a result, the first cam 5a pushes up the boss 6b to rotate the eject lever 6 in a counterclockwise direction, and a switch (not shown) similar to the switch 22 shown in FIG. 3 is flipped up. The engagement between the protrusion 2b and the hook 6c is released. At the same time, as the second cam 5b rotates, the actuating portion 4a of the eject arm 4 follows the second cam 5b while slidingly contacting the second cam 5b due to the rotational biasing of the door holder 2 in the eject direction. Then, the door holder 2 is opened by a predetermined angle and stopped. At this time, the first switch 10 is turned off. When the door holder 2 is opened, the second switch 11 is turned off and the loading motor 7 stops rotating. At this time, the eject lever 6 returns to the original position.

When closing the door holder 2 in the opened state, by pressing a play knob or the like (not shown), both the first switch 10 and the second switch 11 are turned off, The loading motor 7 rotates in the clockwise direction opposite to that when it is opened, the eject arm 4 moves in the opposite direction to the above to close the door holder 2, and the eject lever 6 is actuated by the first cam 5a. The hook 6c rises, and when the door holder 2 reaches the play position, the hook 6c descends and locks the door holder 2.

Since both the door holder 2 and the eject lever 6 are not restricted by the first and second cams 5a and 5b with respect to the counterclockwise rotation, the door holder 2 in the opened state is pushed by hand. The eject lever 6 can be once rotated counterclockwise and locked in the play position.

[0033]

[Effect of the device]

 Since the door holder opening / closing device according to the present invention is configured as described above, the eject arm can be actuated by the second cam with a stroke larger than the radius of the cam gear, so that the cam gear can be made smaller and the entire mechanism can be made smaller. Is very easy to do. For this reason, restrictions on the arrangement of the mechanism are relaxed, and the degree of freedom in designing is increased.

Further, since the size can be reduced as described above, the cost of parts can be reduced.

[Brief description of drawings]

FIG. 1 is a side view showing a door holder opening / closing device of the present invention.

FIG. 2 is a front view showing the door holder opening / closing device.

FIG. 3 is a side view showing a conventional door holder opening / closing device.

[Explanation of symbols]

 1 Mechanical chassis 1a Left side part 1b Motor mounting part 1c Axis 2 Door holder 2a Left side part 2b Protrusion 2c Arm part 3 Spring 4 Eject arm 4a Abutting part 5 Cam gear 5a First cam 5b Second cam 5c Third cam 6 Eject Lever 6a Shaft 6b Boss 6c Hook part 6d Inclined part 7 Loading motor 7a Pulley 8 Square belt 9 Gear pulley 9a Gear

Claims (3)

[Scope of utility model registration request] 1. A cassette tape recording / reproducing apparatus configured so that a door holder, which is rotatably supported and holds a cassette tape in a play position, is biased in a cassette eject direction to lock the door holder in the play position. In the door holder opening / closing device, an eject arm is fixed to the side of the door holder toward the rear, and a cam gear having cams on both sides of the mechanical chassis is rotatably provided on the side of the mechanical chassis. A first cam that operates a rotatable eject lever and a second cam that operates the eject arm on the other surface are integrally provided, and abut on the first cam by rotating the cam gear. The eject lever is rotated to unlock the door holder, and the eject arm is operated by the second cam. Door holder switchgear, characterized by being configured so as to open the serial door holder. 2. A third cam is provided on one surface of the cam gear so as to be symmetrical to the second cam, and a first switch actuated by the third cam is arranged on a mechanical chassis,
2. The door holder opening / closing device according to claim 1, wherein a second switch operated by the opening / closing operation of the door holder is arranged on the door holder to detect the positions of the cam gear and the door holder, respectively. 3. The door holder opening / closing device according to claim 1, wherein the cam gear is meshed with a gear provided in an inner diameter portion of the gear pulley, and the gear pulley is driven by a motor.