JPS59113546A - Power transmitting device of tape recorder - Google Patents

Abstract

PURPOSE:To transmit the power of a motor or the like alternately with one reciprocating motion due to a weak operating force, by attaching directly one and the other end of an elasticity giving member to the second gear and the third gear of a pair of cam gears. CONSTITUTION:In the state just after turning-on of a plunger 12, the detention of a cam gear 3 due to a trigger lever 8 is released, and the cam gear 3 is turned by the force of a rotation charging spring 5 to the position where a projection 3c is detained by another detaining part 8a, and the cam gear 3 is stopped there. At this time, an output lever 15 is shifted in the direction of a white arrow along a cam 3a by a charging spring 19. The detention of a cam gear 4 due to a trigger lever 9 is released, and the cam gear 4 bites the first gear. By this bitting, the power of a motor 1 is transmitted to the cam gear 4, and an output lever 16 is shifted in the direction of an arrow by the lift head due to a cam 4a to output the motor power. In the state just after turning-off of the plunger 12, the detention of the cam gear 4 due to the trigger lever 9 is released, and the cam gear is turned by the force of the rotation charging spring 5 to the position where a projection 4c is detained by another detaining part 9a, and the cam gear is stopped there.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power transmission device for a tape recorder that intermittently transmits the power of a motor, etc.
D) Reverse <REV) The present invention relates to a power transmission device for a cassette tape recorder that switches the tape running direction or moves a head slide plate on which a magnetic head is mounted.

Conventionally, as this type of power transmission device, the one shown in FIG. 1 is known. In the figure, 1 is a motor, and 2 is a first gear. 4 is the flywheel, 5 is the second
It is an eliil car, and is configured to rotate in the opposite direction to the rotation of Tanabata via a belt 3. 6 and 1 are cams 6a, 7a and notches 6d.

7d, locking protrusion θc, 7c and spring catch protrusion 6b
, 7b, and has a laterally symmetrical shape. 8 and 9 are trigger levers, and a locking portion 8a.

8b and 9a, 9b, and engages with the plunger tlO and the core of 11 at 8c, 9c. 1
Reference numeral 4.15 denotes a rotation urging spring, which applies rotational force to the cam gear 6.7 in the direction of the arrow through projections 6b and 7b. 12
．． Reference numeral 13 denotes an output lever, which outputs output in the directions of arrows A and B using cams 6a and 7a.

By turning the plunger 10 ON/OFF, the trigger lever 8 is pulled, the locking part 8a and the protrusion 6C are released, the cam gear 6 meshes with the first gear 2, and the cam 6a and the output lever 12 generate motor power. is transmitted in the direction of arrow A.

Also, by turning plunge p11 ON-OFF,
Similarly, the output lever 13 transmits the motor power in the direction of arrow B.

Then, according to the amount of change of the output lever 12.13, the forward ('F
The tape running direction is switched between =WD) and reverse (REV), and a head slide plate on which a magnetic head is mounted is driven intermittently.

Since such a conventional intermittent power transmission device is configured as described above, separate rotation urging springs are required for each, and it is difficult to obtain a large rotation angle by spring urging.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and provides a simple and reliable intermittent power transmission that can alternately transmit the power of a motor, etc. in one reciprocating motion with a small operating force. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 2, reference numeral 1 at J5 is a motor, and 2 is a first gear mounted so as to transmit the power of the motor. 3 and 4 are a pair of cam gears positioned so as to be able to mesh with the second wheel, each of which is connected to the cam portion 3.
a, 4a, denture part 3b, old), and rotation locking part 3c
, 4c, and the spring hooks are located on the right side of the projections 3d and 4d, and are rotatably supported by shafts 6 and 7.

Reference numeral 5 denotes a rotation biasing spring, and the spring hooks of the cam gears 3 and 4 are connected directly to the projections 3d and 4d as elasticity imparting parts.8 and 9 are trigger levers. Yes, each locking part 8a of two cam gears 3, 4,
8b, 9a, and 9b are on the right, and a plunger engaging elongated hole portion 8c, 9c is provided at one end of the shaft 10.
It is pivoted at 11° and is rotatable. 12 is a plunger, and a pin 12b is fitted into a part of the sliding core 12a, and the pin 121) is fitted into the plunger engagement elongated holes 8C and 9G of the trigger levers 8 and 9. .

13 is a return spring, which connects the core 12a to the trigger lever 8,
9 and is pressed against a stopper 14 provided on the base. 15 and 16 are output levers, and each one 9i
The cam portions 15a and 16a engage with the cam portions 3a and 4a of the cam portions 73 and 4, and are rotatably supported on shafts 17 and 18, while the other ends 151) and 1
In step 61), the power of the motor 1 is outputted. Numeral 19 is a biasing spring that presses the output levers 15 and 16 in the cam direction.

Next, the operation of this invention will be explained. In FIGS. 2 and 3, the first WJ vehicle 2 is constantly rotated by the motor 1 in the direction of the arrow. In FIG. 2, the plunger 12 is in a state where the power is turned off, and the cam gears 3 and 4 are in the protrusion 3c.
, 4c, the locking portions 8b and 9a of the trigger lever 8°9
are in contact with each other, and rotation in the directions of the arrows is locked. At this time, in the cam portion At3, the end of the toothless portion 3b is located near the first gear 2 in the rotational direction, and the cam portion 3a engaging with the protruding J lever 15 is at the maximum radius position. On the other hand, in the cam gear 4, the terminal end of the toothless portion 4b is located near the first gear 2 in the rotational direction, and the cam portion 48 that engages with the output lever 16 is located at the minimum radius position.

FIG. 4 shows the state immediately after the plunger p12 is turned on, and the cam gear 3 is at a position where the locking part 8b of the trigger lever 8 is released and the protrusion 3G is locked with the other locking part 8a. Until then, the rotation stops due to the force of the rotational biasing spring 5. At this time, the output lever 15 is moved by the biasing spring 19 in the direction of the white arrow along the cam 3a. Further, the cam gear 4 is released from the locking portion 9a of the trigger lever 9 and meshes with the first gear. By meshing with the first gear, the power of the motor 1 is transmitted to the cam gear 4, and the output lever 16 is moved in the direction of the arrow by the lifting height of the cam 4a, thereby outputting the motor power. FIG. 2 shows that the cam gear 4 reaches the toothless portion 4b, and the rotation by the rotational biasing spring 5, which is disengaged from the first gear 2, causes the protrusion 4C of the cam gear 4 and the locking portion 9b of the trigger lever 9. It is in a state where it is locked and power transmission has ended.

FIG. 5 shows the state immediately after the plunger 12 is turned off, and the cam gear 4 is unlatched by the locking part 9h of the trigger lever 9, and the protrusion 4C is locked by the other locking part 9a. The rotation is stopped by the force of the rotation biasing spring 5 until it reaches the position.

At this time, the output lever 16 is moved by the biasing spring 19 in the direction of the white arrow along the cam 4a. Further, the cam gear 3 is released from the locking portion 8a of the trigger lever 8, and meshes with the first gear. By meshing with the first gear, the power of the motor 1 is transmitted to the cam gear 3, and the output lever 16 is moved in the direction of the arrow by the lifting height of the cam 3a, thereby outputting the motor power. In FIG. 2, the cam gear 3 reaches the toothless portion 3b, the meshing with the first gear 2 is released, and the rotational biasing spring 5
The rotation caused by the protrusion 3C of the cam portion V3, the trigger lever
This is a state in which the power transmission is completed by being locked at the locking portion 8b of No.8.

Incidentally, FIG. 6 shows a cam gear of the cam gear 3.4 corresponding to the operation of the plunger 12.

In this way, the pair of cam gears allows the I! I ill
Although not shown, the trigger lever 7a
word (FWD'),')t<-s(REV)(7)T
- The mechanism of the tape recorder can be controlled so that the tape traveling direction can be switched and the head slide plate can be driven intermittently.

In the above embodiment, the output is alternately output in the left and right directions in FIG. You may also use this to output alternately in the direction perpendicular to the drawing. Further, in the above embodiment, the output is shown to be reciprocating, but the output may be output alternately in the same direction, or output may be output in the right angle direction.

In the above IC example, two trigger levers are provided (two trigger levers are provided).
Although the fulcrum is used as a fulcrum, it is also possible to use two trigger levers on one fulcrum, or one fulcrum with 1i ~ trigger lever, and the trigger lever is moved by a plunger, but other power sources such as manual manual operation may be used, or even a third 1 gear is directly attached to the motor, but it may also be driven via a belt or the like.

In addition, one locking protrusion and one toothless part were installed on the cam part A7), but two types of operation modes were provided. There may be three types of operation modes.

As described above, according to the present invention, since one end and the other end of the elastic member are directly attached to the second gear and the third gear of the pair of cam portions A7, one By providing elasticity, the two cam gears are always elastic in the meshing direction, which saves space and provides a highly reliable power transmission device with reliable operation.In addition, one cam gear meshes with the first gear. After that, the J force acts in the opposite direction from the point where it is centered over the rotating shaft. Therefore, the backlash between the first gear and the cam part A1 can be absorbed, which has the effect of reducing the occurrence of gear noise. be.

[Brief explanation of the drawing]

Fig. 1 is a J-diagram showing a conventional operating force transmission device;
6 to 6 show a practical DV example of the present invention, FIG. 2 is a diagram showing the end of power transmission when the plunger is OFF, FIG. 3 is a diagram showing the end of power transmission when the plunger is ON, and FIG. 4 is a diagram showing the end of power transmission when the plunger is ON. Figure 5 shows the start of power transmission when the plunger O
The power transmission start diagram at FF, Figure 6 shows the cam part A7 corresponding to the plunger operation! ? - It is. DESCRIPTION OF SYMBOLS 1... Motor, 2... First gear, 3.4... Cam gear, 3a, 4a... Cam part, 3b, 4b...
Missing tooth portion, 3c, 4c...Rotation locking portion, 5...Rotation (4-force spring (elasticity imparting member f, 8゜9...Trigger lever-0 Patent applicant: Agent of PiΔnia Co., Ltd. Patent attorney) Nobuo Kobashi, Patent Attorney Susumu Murai Figure 2 Figure 4

Claims (1)

[Claims] a 11ia wheel capable of transmitting power from a motor, etc., and a second and second gear capable of meshing with the first gear, covering at least one cam, and having a toothless portion such as at least one rotation locking portion. A pair of cam gears consisting of three gears, an elasticity imparting member that rotates the cam gears in the meshing direction, and a movable trigger lever capable of locking the cam gear at at least two rotation angles, the elasticity imparting member A power transmission device for a tape recorder, characterized in that one end and the other end are directly attached to the second and third gears of the pair of cam gears.