KR940007619B1 - Pinch arm driving device of auto-reverse type cassette recorder - Google Patents

Abstract

The driving apparatus comprises a CAM gear (32) driven by a middle gear (31); a CAM following plate (34) rotating with the center of the hinge pin (38); a guide pin (39) making a magnetic head (41) go up and down; operational pins (57,57') supporting pinch arms (37,37'); springs (38,38') supporting the movement of the pinch arms (37,37') with up and down directions.

Description

Pinch arm drive of auto reverse cassette recorder

1 is a plan view showing a mode switching device of an auto reverse cassette recorder according to the prior art.

2 is a plan view showing an application example of a mode switching device of an auto reverse cassette recorder according to the prior art.

3A and 3B are plan views showing the principal parts of the pinch arm driving apparatus of the auto reverse cassette recorder according to the present invention.

4A to 4C show the main components and functions of the pinch arm driving apparatus of the auto reverse cassette recorder according to the present invention.

a is a plan view showing the REV mode;

b is a top view showing the STOP / FF / REW mode.

c is a plan view showing the FWD mode.

* Explanation of symbols for main parts of the drawings

31: middle gear 32: cam gear

33; Hinge pin 34: cam follow plate

35: function plate 36, 36 ': pinch roller

37. 37 ': Pinch arm 38': Torsion spring

38a, 38a ', 57a, 57'a: inclined portion 39: guide piece

39a, 54: locking groove 40: elastic member

41: magnetic head 45, 46: incision

47, 48, 49: gear 50: cam groove

53: cam pin 55: connection pin

56: locking pin 57, 57 ': working pin

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pinch arm driving device of an auto reverse type cassette recorder, and in particular, to simplify the configuration and contribute to light and small size, and to reduce the load and reduce power consumption. The present invention relates to a pinch arm drive of an Otter reverse cassette recorder.

In the commonly used auto reverse type cassette recorder, since the tape must be played in the forward direction or the reverse direction, two capstan shafts and two pinch rollers are provided on both sides. An example of a pinch arm driving device of an auto reverse cassette recorder according to the art will be described with reference to the accompanying drawings.

As shown in FIG. 1, the REV and FWD pinch arms 1, 1 'are pivotally coupled to the hinge shafts 2, 2' at regular intervals on both sides of the main base. Torsion springs 3 and 3 'are coupled to the shafts 2 and 2' to support the pinch arms 1 and 1 'elastically, and to the pinch arms 1 and 1'. The REV and FWD pinch rollers 4 and 4 'are rotatably coupled to each other, and are pressed at predetermined pressures to the REV and FWD capstan shafts 5 and 5' which are rotated by the drive motor.

Between the REV and FWD pinch arms 1 (1 '), a direction change plate (also referred to as "DIRECTION PLATE") 6 is provided to be movable in the x direction, and both sides of the direction change plate 6 are provided. Engagement pins 7 and 7 'are respectively formed in the recess pins 8 and 8' of the REV and FWD pinch arms 1 and 1 '. The upper side of the head drive plate (HEAD DRIVE PLATE) (9) is installed so as to be able to move in the y direction, the support pin (2) to support the torsion spring (3) (3 ') to the head drive plate (9) 10) 10 'and an interlocking pin 12 for interlocking the magnetic head 11 are fixed, respectively.

2 is a plan view showing an application example of the pinch arm driving device of the reverse cassette recorder according to the prior art as described above, in which 13 shows a cam gear, when the cam gear 13 is rotated half a turn. Each time, the mode is switched in the order of PLAY → STOP → PLAY.

In addition, 14 shows a head locking plate (HEAD LOCKING PLATE), 15 is a cam follow plate (CAM FOLLOW PLATE), the head locking plate 14 is not shown in the drawing, but is connected to the solenoid, cam gear 13 And the cam follow plate 15 are interlocked, and as a result, the head drive plate 9 is interlocked.

The operation of the pinch arm driving device of the auto reverse cassette recorder will be described with reference to FIGS. 1 and 2 as follows.

In the PLAY mode, when the power of the driving motor is transmitted to the cam gear 13 through the intermediate gear trains 17, 18, 19 and 20 via the clutch assembly 16, the cam gear 13 is formed in the cam gear 13. The cam follow plate 15 is pulled by the cam curve and restrained by the head locking plate 14.

At this time, the head drive plate 9 is also pulled so that the torsion springs 3 and 3 'supporting both pinch arms 1 and 1' are pulled.

On the other hand, the end of the idler plate (IDLER PLATE) 21 constituting the clutch assembly 16 rotates in accordance with the rotation direction of the idler plate 21 to rotate the direction gear 22, the die The protrusion 23 formed on the lower surface of the traction gear 22 moves the direction change plate 6 in the x direction.

That is, as shown in FIG. 1, when the turning plate 6 moves to the right in the drawing, one side support pin 10 of the turning plate 6 is inclined cam 8 of the pinch arm 1. Since the pinch arm (1) is rotated in the clockwise direction by the elastic restoring force of the torsion spring (3), the REV pinch roller (4) is pressed against the REV capstan shaft (5), while the turning plate (6) Since the other support pin 10 'of the pinch arm 1' pushes the inclined cam 8 ', the pinch arm 1 is rotated clockwise while winning the elasticity of the torsion spring 3' so that the FWD pinch roller ( 4 ') is separated from the FWD capstan shaft 5'.

When performing the normal reversing operation in such a state, the reverse direction of rotation of the driving source is reversed, and the reversing direction of the direction change plate 6 is reversed. 4) is separated from the REV capstan shaft 5, and the FWD pinch roller 4 'is pressed against the FWD capstan shaft 5' at a predetermined pressure.

However, in the pinch arm driving apparatus of the auto reverse cassette recorder according to the prior art as described above, the head drive plate 9 is a structure in which both torsion springs 3 and 3 'are simultaneously pulled out, and the overall configuration is as follows. There was a disadvantage that it can not contribute to light carbonization of the product is complicated, and there was also a problem such as increased power consumption.

SUMMARY OF THE INVENTION The main object of the present invention is to provide a pinch arm driving apparatus of an auto reverse cassette recorder, which can simplify a configuration and contribute to light and small size reduction of a product.

Another object of the present invention is to provide a pinch arm driving apparatus of an auto reverse cassette recorder which can reduce power consumption by preventing an excessive load on a part.

In order to achieve the object of the present invention as described above, an intermediate gear rotated by a driving principle power, a cam gear selectively rotated by the rotation of the intermediate gear, and a hinge pin by the rotation of the cam gear. Resiliently supports the cam follower plate which is rotatably installed, the function plate which moves left and right in the x direction by the rotation operation of the cam follower, and the REV and FWD pinch arms supported by the REV and FWD pinch rollers. And a torsion spring guided directly to the function plate and a guide piece having a locking groove formed integrally with each other to form a magnetic head that is elastically supported by an elastic member. An apparatus is provided.

Hereinafter, the pinch arm driving apparatus of the auto reverse cassette recorder according to the present invention will be described according to the embodiment shown in the accompanying drawings.

3 and 4 are plan views showing the main components of the pinch arm driving apparatus of the auto reverse cassette recorder according to the present invention, and the pinch arm driving apparatus of the auto reverse cassette recorder according to the present invention is shown in FIG. As described above, the intermediate gear 31 that is rotated by the power of the driving source, the cam gear 32 that is selectively rotated by the rotation of the intermediate gear 31, and the hinge pin by the rotation of the cam gear 32 A cam follower plate 34 rotatably installed around the 33, a function plate 35 which is horizontally moved by a rotational operation of the cam follower crate 34, and FIG. As shown in FIG. 8, the REV and FWD pinch rollers 36 and 36 'are elastically supporting the supported REV and FWD pinch arms 37 and 37' while being guided directly to the function plate 35. Guide piece 39 formed with torsion springs 38 and 38 'and a locking groove 39a. Are integrally formed, is composed of an elastic member 40, the magnetic head 41 is elastically supported by the.

In the drawings, reference numerals 42 and 42 'denote capstan shafts, and 43 and 43' show support points.

The cam gear 32 has gear portions 47, 48, 49 formed on the outer circumferential surface of the cam gears 32 between the incisors 44, 45, 46 formed at a predetermined angle, for example, 120 °. And the cam grooves 50 having different radius sizes are continuously formed in an endless shape.

The cam follow plate 34 is inserted with a cam pin 53 guided into the cam gear 32 and the cam groove 50, and a locking groove 54 is formed at the rear end thereof.

The function plate 35 has a connecting pin 55 inserted into the locking groove 54 of the cam follow plate 34 in the middle portion, and a locking pin 56 caught by the locking groove 39a of the magnetic head 41. And the actuating pins 57 and 57 'which are in direct contact with the torsion springs 38 and 38' are fixed, respectively.

The function plate 35 is configured to be able to move left and right in the x direction along guide pins 59 and 59 'inserted into guide holes 58 and 58' respectively formed on both sides.

The torsion springs 38 and 38 'are bent to form inclined portions 38a and 38'a for smooth contact with the actuating pins 56 and 56' of the function plate 35.

The elastic member 40 preferably uses a tension coil spring for elastically supporting the magnetic head 41 with a uniform force to the rear.

The operation and effect of the pinch arm driving device of the auto reverse cassette recorder according to the present invention configured as described above are as follows.

4 shows the REV mode. When the cam gear 32 is rotated 120 ° in the clockwise direction, the cam groove 50 formed in the cam gear 32 corresponding to the cam pin 53 of the cam follow plate 34 is rotated. Since the radius of the cam gradually decreases, the cam follow plate 34 rotates clockwise around the hinge pin 33, and the connecting pin 55 is connected to the locking groove 54 of the cam follow plate 34. As shown in b of FIG. 4, the combined function plate 35 is moved to the center position by moving from the right side in the drawing to be the STOP / FF / REW mode.

At this time, as shown in b of FIG. 3, since the locking groove 39a of the magnetic head 41 is positioned at the locking pin 56 of the function plate 35, the magnetic head 41 is the elastic member 40. At the same time, it retracts backward by the elastic restoring force, and the actuating pins 57 and 57 'of the function plate 35 from both the torsion springs 38 and 38' are displaced. The pinch rollers 37, 37 'are rotated counterclockwise and clockwise respectively by the elastic restoring force of the pinch rollers 36, 36' from the capstan shafts 42, 42 '. .

When the cam gear 32 rotates 120 ° clockwise again in this state, the radius of the cam groove 50 formed in the cam gear 32 corresponding to the cam pin 53 gradually decreases, so the cam follow plate 34 ), The function plate 35 coupled to the engaging groove 54 of the cam follow plate 34 by the rotation of the cam moves further from the right side in the drawing, as shown in FIG. It is in FWD mode.

At this time, as shown in a of FIG. 3 by the movement of the function plate 35, the magnetic head 41 is moved to the front side while the elastic head 40 overcomes the elasticity of the elastic member 40 by the locking pin 56, Since the actuating pin 57 pushes the inclined portion 38'a of the torsion spring 38 'supporting the FWD pinch arm 37', the FWD pinch arm 37 'is rotated counterclockwise to rotate the FWD pinch. The roller 36 'is brought into close contact with the capstan shaft 42'.

The pinch arm driving apparatus of the auto reverse cassette recorder according to the present invention as described above is switched in the order of STOP → FWD → REV → STOP → FWD → REV, for example, to switch from the FWD mode to the STOP mode. In this case, the solenoid (not shown), which is an actuator, is operated twice to rotate the cam gear 32 by 120 ° × 2.

As described above, the pinch arm driving apparatus of the auto reverse cassette recorder according to the present invention can simplify the configuration and contribute to the light and small size of the product, and reduce power consumption by reducing the load during mode switching. It works.

On the other hand, Figure 5 shows a plan view showing another embodiment of the pinch arm drive device of the auto reverse cassette recorder according to the present invention, as shown in this, a separate inclined portion in the torsion springs 38, 38 ' (38a) (38'a) is formed in a simple shape at the end only without forming, and the inclined portion (57a) (57'a) is provided with actuating pins (57, 57 ') on both sides of the function plate 35 It is formed to form.

The actuating pins 57 and 57 'are formed of a die-casting material to caulk a predetermined portion of the function plate 35, or to form an resin outsert, or as shown in FIG. As described above, the function plate 35 of the press can be blanked appropriately to form integral actuating pins 57 and 57 'that are bent to be inclined on both sides.

In another embodiment of the pinch arm driving apparatus of the auto reverse cassette recorder as described above, the shape of the torsion springs 38 and 38 'is not only simplified, but also easy to manage parts, and improves productivity. There is an additional effect.

Claims (7)

The intermediate gear 31 rotated by the power of the driving source, the cam gear 32 selectively rotated by the rotation of the intermediate gear 31, and the hinge pin 33 by the rotation of the cam gear 32 are rotated. The cam follower plate 34 rotatably installed at the center, the function plate 35 linearly moved left and right by the rotation operation of the cam follower crate 34, and the intermediate part of the function plate 35. A pinch arm is provided by a guide piece 39 for moving the magnetic head 41 up and down by a locking pin 56 and actuating pins 57 and 57 'provided at the left and right sides of the function plate 35. A pinch arm drive device for an auto reverse cassette recorder, comprising: a torsion spring (38) (38 ') that supports (37) (37') elastically and supports up and down movement. The cam gear 32 has gear portions 47, 48, and 49 respectively formed between the incisors 44, 45, and 46 formed at a predetermined angle on the outer circumferential surface thereof. Pinch arm of the auto reverse cassette recorder, characterized in that the cam groove 50 having different sizes are continuously formed in an endless shape, and the cam pin 53 of the cam follow plate 34 is inserted into the cam groove 50. Drive The method of claim 1, wherein the function plate 35 has a connecting pin 55 is fixed to the middle portion, the locking groove 54 is formed at the rear end of the cam follow plate 34, the locking groove 54 A pinch arm drive device of an auto reverse cassette recorder, characterized in that the coupling pin (55) is coupled to. 2. The pinch arm driving apparatus of claim 1, wherein the guide piece (39) is formed with a catching groove (39a) through which a catching pin (56) is guided. The torsion spring (38) 38 (38) is characterized in that the inclined portion (38a) (38'a) is formed for smooth contact with the actuating pins (57) (57 '), respectively. Pinch arm drive of reverse cassette recorder. 2. The auto reverse of claim 1, wherein the actuating pins 57, 57 'are formed with inclined portions 57a, 57'a for smooth contact with the torsion springs 38, 38'. Pinch arm drive of the type cassette recorder. 6. The pinch arm drive of an auto reverse cassette recorder according to claim 1 or 5, wherein the actuating pins 57 and 57 'are integrally bent from the function plate 35 with a predetermined inclination angle. Device.