JPS58102860A - Mechanism for attaching swinging idler - Google Patents

Abstract

PURPOSE:To permit to make the mechanism thin and improve the properties of assembling and servicing by a method wherein the annular groove of a driving shaft and an hour-glass shaped hole of a connecting member are utilized to attach a spring for pressing the idler against the driving shaft through the connecting member. CONSTITUTION:In order to attach the assembled body of the idler to the shaft 5, the wall 13d of the connecting member 13 is pushed against the resilient force of the spring 14 and is inserted into the shaft 5 under a condition that the large diametral part of a long hole 13a is coinciding with the long hole 7b of the arm 7 of the swinging idler, then the pushing of the wall 13d is stopped after the connecting member is inserted into the groove of the shaft 5. According to this method, the connecting member 13 is moved to the direction of the shaft 7a by the resilient force of the spring 14 and the small diametral part of the long hole 13a is engaged with the groove of the shaft 5, therefore, the idler 8 is pushed against a driving pulley 6 by the force of the spring 14 and the arm 7 of the swinging idler may be attached pivotally about the shaft 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mounting device for a neck photographing eye 2 used for driving a reel of a magnetic recording/reproducing device.

The conventional mounting structure has two arms that rotate around the drive shaft, one arm supports the idler rotatably, and the idler is crimped against the drive shaft with a predetermined force between the two arms. A spring like this was stretched, and four locks were used to prevent these arms from being removed from the drive shaft. However, this method requires that the drive shaft portion be at least as thick as the two arms and the stopper, which is an obstacle to making the device thinner. In addition, idlers made of rubber parts are often replaced during service, and it is troublesome to remove the stopper.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to provide a device that can be made thinner and has excellent assembly and serviceability.

In the present invention, a spring for crimping the idler is attached to the drive shaft via a connecting member in a swivel idler device, and a groove with a width larger than the wall thickness of the connecting member provided on the drive shaft and a diameter of the drive shaft provided on the connecting member are formed. By using the larger hole and the biasing force of the spring, the connecting member also serves to prevent the idler arm from coming off from the drive shaft.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. FIG. 1 is a plan view of the entire VTR mechanism employing the present invention, showing the stop mode.
11.58 are provided, each rotatably reel stand 2
．． and 3 are attached. The shaft 5 is a fixed shaft provided approximately on the perpendicular bisector of both reels on the sub-chassis 4 fixed to the chassis 1, and the drive pulley 6 rotates as shown in detail in FIGS. 2 and 3. The oscillating idler arm 7 is also rotatably attached. A shaft 7 is installed in the single swing idler arm 7, and supports an idler 8 rotatably. The oscillating idler arm 7 and idler 8 are made of felt 9. spring 10
゜Spring seat 11. The stopper 12 is coupled to provide a predetermined 7 traction torque necessary for swinging the arm. Further, 13 is a connecting member having a long hole 1n, and a spring 1 is inserted between the hole 15b provided at one end and the shaft 7a.
4 is attached to keep the idler 8 pressed against the drive pulley 6 at all times, and also serves as a retaining ring for attaching the swinging idler arm 7 to the shaft 5 through a groove 5aK formed in the shaft 5. Next, this mounting structure will be explained in detail with reference to FIG. The connecting member 1S has an arm portion 15 extending left and right.
Hole 7C is provided with C and is formed in a serpentine idler arm.
It is possible to suppress the area.

The long hole 1n provided in the connecting member 15 is a continuous long hole with a large diameter part and a small diameter part, the small diameter part is far away from the hole 13b, the large diameter part is larger than the diameter of the shaft 5, and the small diameter part is The diameter of the groove 5 provided on the shaft 5 is larger than the diameter of the groove 5, but smaller than the diameter of the groove 5. father,
The relationship between the wall thickness t of the portion where the long IM1 of the connecting member 13 is provided and the width H of the shaft SKW and the groove is t-d(-). An elongated hole 7b that fits into the diameter part C is provided, and the direction in which the idler 8 is crimped onto the drive goose y6 is the longitudinal direction of the elongated hole. A drive belt 17 is stretched between the motor pulley attached to the motor pulley and the belt pulley 16 rotatably provided on the shaft 5Kli.
The driving pulley 6 and the belt pulley 16 are connected to a connecting pulley 18.
The rotation directions are integrally connected. With the above configuration, the arm 15C of the connecting member 1s is connected to the hole 7C.
Insert the spring 14 between the hole 1b and the shaft 7a of the idler 8.
When the connecting member 15 is stretched, the connecting member 15 moves toward the shaft 7a side by the urging force of the spring 14, and the arm portion 15C comes into contact with the wall 7dK provided on the swing idler arm 7, and the posture is regulated.
Next, in order to attach the idler assembly in this state to the shaft 5, push the wall 11Sd part of the connecting member 1s against the biasing force of the spring 14, so that the large diameter part of the long hole 1 button is connected to the swing idler arm. When the connecting member 15 is inserted into the shaft 5 so as to overlap the elongated hole 7b of 7, and the connecting member 15 is inserted up to the groove 51 part, %13d
Stop suppressing the department. Then, the connecting member 1s is moved in the direction of the shaft 7 by the urging force of the screw 14, and the small diameter part of the elongated hole 1n is engaged with the 45 m diameter part, so the idler 8 is moved by the driving pulley 6. At the same time, the swing idler arm 7 is rotatably attached around the shaft 5. In this state, the motor 15
When the belt pulley 16 is rotated clockwise in FIG. 1, the belt pulley 16 starts rotating clockwise by the bell 17 in FIG.

Therefore, since the drive gear 6 is rotated clockwise around the shaft 5 via the connecting pulley 18, the corner idler arm 7 is also rotated clockwise at 4 o'clock due to the friction torque caused by the felt washer 9 and the spring IOK. When the idler 8 is rotated and eventually comes into contact with the outer periphery of the reel stand 5, the idler 8 begins to rotate the reel stand 5 clockwise. At this time, the connecting member 1s is connected to the shaft 5. It is clear that the idler 8 and drive pulley 6 are kept in a uniform state of pressure because the swing idler arm 7 rotates around the @S a provided in the same direction in synchronization with the oscillating idler arm 7. When the motor 15 is rotated counterclockwise next time, the drive pulley 6 starts to rotate counterclockwise through the same transmission path, and the oscillating idler arm 7 rotates counterclockwise. The rotation of the reel stand 2 is transmitted in the counterclockwise direction, and at this time also, the connecting member 1s is synchronized with the 11 m rear idler arm 7 and rotates in the same direction.

Thus, according to Honjitsu A111K.

Since the dice idler part of a reel drive device such as YI'R can be made into a subassembly that includes the compression spring, installation and removal can be done with one touch, greatly improving workability and serviceability. Furthermore, since the dedicated arm and retaining ring for the compression spring as in the prior art are not required, the height of the drive shaft 5 can be lowered, and the device can be made thinner.

As described above, according to the present invention, it is possible to reduce the number of parts and make the device thinner, and at the same time, it is possible to install and remove with one touch instead of the troublesome work of conventional retaining rings and screws. Because of this, it is easy to work and
We were able to improve service quality.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of a VTR according to the present invention.2.5...Reel stand 5...Axle 5m...
#11 6-river drive pulley 7... head, rear idler arm 8... idler 15... connecting member 15a.
...Slot hole 14...Spring 15...Motor shaft Z circle 3 1'3 Fig.

Claims (1)

[Claims] t. A spring set to press an idler rotatably supported on a rotating arm rotatably about a drive shaft with a predetermined force to the drive shaft is attached to the rotating arm. In a penetrating idler device that is attached between drive shafts via a connecting member, a groove having a width larger than the wall thickness of the connecting member formed in the driving shaft and at least one of the driving shafts provided in the connecting member. A mounting mechanism for a neck-shooting idler, characterized in that the connecting member is configured to prevent the rotating arm from being removed from the shaft by a hole larger than the diameter and a biasing force of the spring.