JPH0121546B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reel stand drive mechanism suitable for use in a VTR. Generally, the VTR stand drive mechanism in a VTR is used for recording,
It is necessary to switch the rotational speed and direction of the reel stand, and whether it is slip drive or direct drive, depending on the playback mode, fast forwarding, and rewinding mode. For this reason, each gear of the reel stand is made up of a gear that is driven via a slip mechanism when the capstan is driven during recording and playback, and a gear that is directly driven when the non-capstan is driven during fast forwarding and rewinding. In the case of selective driving using two idlers, a mechanism for shifting the idlers in the vertical direction is required, resulting in a complicated mechanism. The invention therefore seeks to overcome the above-mentioned drawbacks. An embodiment of the present invention will be described below with reference to the drawings. Figures 1 and 2 show a plan view and a side view of the mechanism of this embodiment. In the figures, 1 and 2 are supply and take-up reel stands, and both reel stands are used for recording, reproducing, etc., respectively. The first supply gear 1b and the first take-up gear 2b are driven via a slip mechanism (not shown) when the capstan is driven, and the second supply gear 1a is directly driven when the capstan is not driven such as during fast forwarding or rewinding. and a second winding gear 2a. 3 is a fixed plate screwed to a boss 4a integrally molded on the chassis 4 ; 5 is a drive motor attached to the lower surface of the fixed plate; 6 is a motor pulley connected to the drive shaft of the drive motor; 7 is the This drive pulley is supported by a support shaft 9 mounted on a fixed plate via a guide boss 8, and is connected to the motor pulley by a belt 10. Further, the support shaft is provided with first and second drive gears 11 and 1 above and below the drive pulley.
2, and first and second idler levers 13 and 14
are arranged, and the first and second idler levers have first and second idler gears 13a and 14a that are always engaged with the first and second drive gears, respectively, and a slide cam that can be engaged with a slide cam that will be described later at the tip. First and second engagement pins 13b and 14b are arranged. On the other hand, reference numeral 15 denotes a slide cam that is slidably supported by the fixed plate 3 and slides according to the operation mode to control the rolling contact of the two idlers to the two reel stands, and the first and second engagement pins are connected to each other. Engageable first to third cam parts 15a to 15c, a notch 15d into which the guide boss 8 is loosely fitted, and a loosely fitting pin 1 which is loosely fitted in the notch 3a provided on the fixed plate.
5e is provided. Further, one end of a rotating arm 17 that is rotatable around a support shaft 16 provided on the back surface of the fixed plate is loosely fitted into the loosely fitting pin,
The other end of the rotating arm is adapted to engage with one of the first to third cam portions 18a to 18c provided on the outer periphery of the loading disk 18 for loading the tape. In addition, 19 indicates the loose fitting pin 15e and the fixing plate 3.
This spring is stretched between the rear surface of the rotary arm 17 and always biases the other end of the rotating arm 17 toward the loading disk 18. Next, the operation of the mechanism of this embodiment will be explained with reference to FIGS. 3 to 5. First, in the recording/reproducing mode, the loading disk 18 is at the loading completion position as shown in FIG.
It is in pressure contact with the Therefore, the slide cam 15 is in the first position slid to the left in the figure, and the clockwise rotation of the drive motor 5 causes the first and second idler levers 13 and 14 to rotate clockwise, and the first and second idler levers 13 and 14 are rotated clockwise. Since the first idler gear 13a meshes with the first take-up gear 2b, the take-up reel stand 2 is slip-driven. At this time, the second engagement pin 14b of the second idler lever 14 is connected to the first cam portion 1 of the slide cam 15 .
5a to restrict rotation of the second idler lever, the second idler gear 14a and the second take-up gear 2 are spaced apart from each other. Next, in fast forward mode, as shown in Figure 4,
The loading disk 18 is at a position slightly rotated in the loading direction from the unloading position, and the rotating arm 17 is in pressure contact with the second cam portion 18b. Therefore, the slide cam 15 is in the second position, and the high speed clockwise rotation of the drive motor 5 causes the second engagement pin 14b to move to the first position of the slide cam.
Since the second idler gear 14a is spaced apart from the cam portion 15a and meshes with the second take-up gear 2a, the take-up reel stand 2 is directly driven at high speed. At this time, the first engagement pin 13 of the first idler lever
b is engaged with the third cam portion 15c, so the first idler gear 13a and the first winding gear 2b are separated from each other. Finally, in the stop mode, the loading disk 18 is in the unloading position, and the rotating arm 17 is in pressure contact with the third cam portion 18c. Therefore, the slide cam 15 is in the third position, and the first and second engaging pins engage with the third and second cam portions 15c and 15b of the slide cam, respectively. The two idler gears are spaced apart from the gears of each reel stand. Next, the assembly of the above mechanism will be explained. First, the drive motor 5 is placed in a predetermined position on the chassis 4.
Install. Next, the support shaft 9, the first and second drive gears 11, 12,
After passing the drive shaft of the drive motor 5 through the fixed plate 3 which is integrally provided with the first and second idler levers 13 and 14 and the slide cam 15 , the fixed plate 3 is fixed to the boss 4a on the chassis 4 with screws. do. In the above-described embodiment, the drive motor 5 is attached to the chassis 4 in advance, but it may be attached to the fixed plate 3 in advance. As described above, according to the present invention, a reel is provided with a gear that is driven via a slip mechanism when the capstan is driven during recording and playback, and a gear that is directly driven when the capstan is driven during fast forwarding and rewinding. The drive mechanism for selectively driving each of the gears of the stand can be easily constructed.

[Brief explanation of drawings]

The drawings all relate to one embodiment of the present invention; Fig. 1 is a plan view of the mechanism of the present invention, Fig. 2 is a side view of the same, and Figs. 3 to 5 show play mode, fast forward mode, and It is an explanatory diagram of operation in stop mode. Explanation of main drawing numbers, 1 , 2 ... Supply and take-up reel stand, 3 ... Fixed plate, 4 ... Chassis, 5...
Drive motor, 11, 12...first and second drive gears, 13 , 14 ...first and second idler levers,
13a, 14a...first and second idler gears, 1
5...Slide cam, 17...Rotating arm, 18
...Loading disk.

Claims (1)

[Scope of Claims] 1. First and second idlers that are in rolling contact with a drive shaft attached to a fixed plate and constitute mutually independent swinging mechanisms; and rolling contact between the first and second idlers and a reel stand. In order to perform the separation in response to the control mode, the first,
A reel stand drive mechanism comprising: a single control plate having a plurality of cam parts that regulate rotation of a second idler;