JPH0348755Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a loading gear drive device for a video tape recorder. The present invention relates to a loading gear drive device that drives a loading gear with a simple configuration that includes a fan-shaped gear and an auxiliary plate.

[Conventional technology]

As shown in FIG. 4, a conventional loading gear drive device that is commonly used has an intermediate gear 3 installed in front of a loading gear 4a, and a lever gear 2 having teeth 2a connected to the intermediate gear. 3, a cam 1 having a cam slot 1a on its upper surface is disposed on the lower part of the lever gear 2, and an actuating pin 2 protrudes from the lower surface of the lever gear 2.
The main part is constructed by inserting the cam slot 1a into the cam slot 1a.

Then, when the cam 1 rotates due to the driving force,
The lever gear 2 that comes into contact with the cam slot 1a of the cam 1 rotates, and the intermediate gear 3 that meshes with the lever gear 2 rotates, resulting in loading gears 4a and 4b.
rotates, each loading arm 5, 5' fixed to the loading gear rotates, and each trailer 7, 7' is transferred to the stopper 10, 10' along the guide hole 9, 9'. be done. At this time, guide rollers 11 fixedly installed on each trailer 7, 7',
11' is transported together with the tape engaged therewith, so that the tape is mounted on the outer peripheral surface of the head drum 8.

[Problem that the invention attempts to solve]

Such a conventional loading gear drive device transmits the power of the cam 1 to the loading gear 4a using the lever gear 2 and the intermediate gear 3. ,
In addition to providing a cam slot for driving the operating plate to change various modes such as play and rewind,
Since a cam slot for operating the lever gear 2 is separately provided on the upper surface of the cam 1, the structure and operation thereof are complicated.

Further, since such conventional technology uses the lever gear 2, there is a problem in that it is subject to design restrictions such that the cam 1 must be installed as close to the loading gear 4 as possible.

[Means for solving problems]

The present invention was devised in order to solve such problems, and will be explained using FIG. 1 corresponding to the embodiment.
04', the cam slot 10 of the cam 101
An actuating plate 1 that moves in a straight line from side to side as it is moved by 1a.
09 is loosely provided on the board, and a fan-shaped gear 110 that meshes with the loading gear 104 is fitted into a shaft pin 111 protruding from the board.
The auxiliary plate 112 is placed on top of the top surface of the shaft pin 11.
1 and the protrusion 110 of the fan-shaped gear 110.
e and the protrusion 112d of the auxiliary plate 112 are urged by the coil spring 113, and the fan-shaped gear 110
The auxiliary plate 112 has linear abutting portions 110b, 112b and engaging portions 110c, 11, respectively.
2a, respectively, and the connecting pin 109a protruding from the actuating plate 109 is connected to each engaging portion 1.
The structure is such that it is inserted between 10c and 112a.

[Effect]

In the present invention, when the cam 101 is rotated counterclockwise or clockwise with a predetermined driving force by the above-mentioned means, the actuating pin 109c of the actuating plate 109 inserted into the cam slot 101a of the cam 101 moves to the left or Move the actuating plate 10 in a straight line to the right.
9 are moved together. The contact pin 109a protruding from the rear end portion of the actuating plate 109 is
Engaging portion 110c of sector gear 110 or auxiliary plate 1
12 to the left or right to rotate the fan-shaped gear 110 clockwise or counterclockwise, and the loading gear 104 that meshes with it rotates counterclockwise or clockwise. The other loading gear 104' is rotated in its counterclockwise direction.

When each loading gear is rotated in this way, each loading arm 105, 105' rotates, and each guide roller 121, 121'
head drum 1 with the tape engaged with it.
18 to the loading position or return to the original position.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3.

The structure of the present invention will be explained with reference to FIG. 1. As the cam 101 rotates, the contact pin 109c that comes into contact with the cam slot 101a comes into contact with the actuating plate 1.
09 operates in a straight line left and right, the contact pin 109a protruding from one end of the operating plate 109 moves, and the sector gear 110 rotates.
Each loading gear 104, 10 meshes with
4' is designed to rotate.

The actuating plate 109 has, at one end thereof,
A contact pin 109c is provided protrudingly to come in contact with a cam slot 101a provided on the lower surface of the cam 101,
A movable pin 109a, which is abutted to the fan-shaped gear 110 and the auxiliary plate 112, is protrudingly provided at the rear end, and guide holes 109b, 1 are provided in the center, which are linear in the left and right direction.
09b' are provided respectively, and the guide holes 109b,
119b' are respectively inserted and installed so that the actuating plate can freely move.

Further, the fan-shaped gear 110 is provided with a tooth portion 110a at one end thereof so as to mesh with the loading gear 104, and a linear abutting portion 110b and a linear abutting portion 110b at the other end thereof. Contact pin 1
09a, and the fan-shaped gear 110 is fitted onto a shaft pin 111 protruding from the base plate.

Further, the auxiliary plate 112 is provided with an arc-shaped guide hole 112c in the center of the square circular shape, into which the guide pin 110d protruding from the sector-shaped gear 110 is inserted. A hooking portion 112 inserted into and abutting the connecting pin 109a on one side of the
a and a linear abutment part 112b, and the auxiliary plate 112 is inserted into the guide pin 110d through the guide hole 112c so as to overlap the top surface of the fan-shaped gear 110, and then fitted onto the shaft pin 111. have it set up.

Further, a protrusion 112d integrally formed on one circular side of the auxiliary plate 112 and the sector-shaped gear 11
A coil spring 113 biases a protrusion 110e protruding and fixed to one end of the coil spring 113.

To explain the operation of the loading gear drive device of the present invention configured as described above, as shown in FIG. When the actuating plate 109 is moved in a straight line in the left direction, the contact pin 109a protruding from the actuating plate 109 connects with the engaging portion 11 of the fan-shaped gear 110.
0c, the sector gear 110 rotates clockwise around its shaft pin 111, and the loading gear 104 meshes with the tooth portion 110a of the sector gear 110; ' rotate counterclockwise and clockwise, respectively, and the loading arms 105, 105' fixed to the loading gears 104, 104' rotate, respectively, and the trailers 117, 117' move through the guide hole. 119,11
9', each trailer 117, 11
Guide rollers 121, 12 fixedly installed at 7'
1' moves to the stoppers 120, 120' together with the tape engaged with it, and the head drum 1
The tape is mounted on the outer peripheral surface of the tape 18, and the loading is completed.

FIG. 2 shows such a loading state, and even if the actuating plate 109 continues to move leftward after loading, the contact pin 109a of the actuating plate 109 will not connect to the fan-shaped gear. Since the gear 110 moves in contact with the linear contact portion of the gear 110, power transmission is interrupted and the rotation of the sector gear 110 is stopped. Therefore, each loading gear 104, 10
4' and the respective guide rollers 121, 121' are stopped, and the tape continues to be loaded. So, in this state, move the actuating plate further to the left,
Various modes such as play, rewind, fast forward, etc. are performed.

Further, as shown in FIG. 2, when operating the tape from a loaded state to an unloading state, the cam 101 is rotated clockwise and the operating plate 109 is moved to the right. The movable pin 109a of 109 is attached to the auxiliary plate 112.
By pressing the engaging portion 112a of the auxiliary plate 112,
It rotates counterclockwise around the shaft pin 111, and the fan-shaped gear 110, which is biased by the coil spring 113 on the auxiliary plate 112, rotates together, returning to the original state shown in FIG. . That is, the unloading action is completed.

Furthermore, in order to perform various modes in the unloading state as shown in FIG.
09 to the right, the movable pin 109a on the actuating plate 109 is moved to the engaging portion 1 of the auxiliary plate 112.
12a, the auxiliary plate 112 rotates counterclockwise as shown in FIG.
10 does not rotate any further, each loading gear 104, 104' and each guide roller 12
The drive of 1, 121' remains stopped, and various modes such as an ejector can be performed in the unloading state.

[Effect of idea]

As explained above, the loading gear drive device of the present invention has an intermediate gear,
Loading can be done with a relatively simple device formed by a fan-shaped gear and an auxiliary plate using a conventional mode conversion operation plate without using a lever gear or a separate operation cam slot for mode conversion. Furthermore, since unloading can be performed, the number of required parts is reduced, and there is an effect of avoiding design restrictions such as having to place the cam close to the loading gear in order to engage the lever gear.

[Brief explanation of drawings]

1 to 3 are partial plan views showing the configuration and operation of the drive device according to the present invention, and FIG. 1 is a partial plan view showing the tape unloading state.
FIG. 2 is a partial plan view showing a state in which the actuating plate continues to move to the left after the tape is loaded. FIG. 3 is a partial plan view showing the operating state when the operating plate moves to the right after the tape is unloaded. FIG. 4 is a partial plan view showing the structure and operation of a conventional drive device. In the figure, 101 is a cam, 101a is a cam slot, 104 and 104' are loading gears, and 10
5, 105' is a loading arm, 109 is an operating plate, 109a is a contact pin, 109b, 109
b' is a guide hole, 109c is a contact pin, 110 is a fan-shaped gear, 110a is a tooth portion, 110b is a contact portion, 11
0c is a hooking part, 110d is a guide pin, 110e is a protrusion, 111 is a shaft pin, 112 is an auxiliary plate, 112
112b is a contact portion, 112c is a guide hole, 112d is a protrusion, 113 is a coil spring, and 114, 114' are guide pins.

Claims (1)

[Claims for Utility Model Registration] Rotation of the cam 101 rotates the rotating cam slot 101a, the actuating plate 109 that operates in contact with the cam slot 101a, and the loading gear 104 via the actuating plate 109. The operating plate 109 has a sector-shaped gear 110 and an auxiliary plate 112.
A contact pin 109c that comes into contact with the cam slot 101a of the cam 101 is provided protrudingly, and a contact pin 109a that contacts the fan-shaped gear 110 and the auxiliary plate 112 is provided protruding from the rear end portion of the contact pin 109c, and a contact pin 109c that contacts the sector gear 110 and the auxiliary plate 112 is provided protrudingly from the rear end portion of the contact pin 109c. Straight guide holes 109b and 109b' are provided in the left and right direction, and guide pins 114 and 114' protruding from the base plate are respectively inserted into the guide holes and loosely engaged with the loading gear 104. The fan-shaped gear 110 is provided with a tooth portion 110a that meshes with the loading gear at one end thereof, and a linear abutment portion 110b inserted and abutted by the contact pin 109a at the other end portion. Engagement part 110c
and the fan-shaped gear 110 is loosely fitted onto a shaft pin 111 protruding from the base plate, and the auxiliary plate 112 having an angular circular shape has a protrusion 112d on one side of the circular shape. are integrally formed,
A linear protruding portion 112b and an engaging portion 112a that is inserted into and abutted on the movable pin 109a are provided at the corner portion and one circular side portion, respectively, so that the auxiliary plate 112 can be attached to the shaft. The pin 111 is loosely fitted over the top surface of the sector gear 110, and the guide pin 110d protrudes from the center of the top surface of the sector gear 110. A protrusion 110e inserted into the guide hole 112c and protruding from one end of the fan-shaped gear 110, and a protrusion 112 of the auxiliary plate 112.
A loading gear drive device for a video tape recorder, characterized in that d and d are biased by coil springs 113, respectively.