KR19990014713U - VRC's Pinch Roller - Google Patents

Abstract

The present invention is to maintain the running speed of the video tape by increasing the friction force of the pinch roller that is interlocked by the rotation of the capstan shaft of the V-Cal to prevent the pinch roller from sliding in contact with the video tape.

The present invention is to form a plurality of long grooves 14 at regular intervals in the vertical direction in the rubber 12 coupled to the outer peripheral surface of the pinch roller 10 in close contact with the capstan shaft 20 of the V-Cal, rubber 12 Since the part with and without the long groove 14 alternately contacts the video tape 30 and does not slide, the head drum assembly (as the video tape 30 travels the mechanism at a constant speed in proportion to the rotation of the capstan motor). In 40, the signal recorded on the video tape 30 can be reproduced well.

Description

VRC's Pinch Roller

The present invention relates to a pinch roller of V-Cal, and more particularly, to a pinch roller of V-Cal for maintaining a constant running speed of the video tape by forming a long groove in the rubber of the pinch roller to increase frictional force in contact with the video tape. will be.

In general, the driving mechanism of V-Cal has a pair of reel tables 110 disposed at both sides for driving a supply reel and a rewind reel of a tape cassette wound with video tape on a deck, as shown in FIG. A pair of guide posts 112 that designate a running path of the tape at a predetermined distance from both reel tables 110 and a pair of inclined posts 114 which allow the video tape to run at an angle are provided. Between the warp posts 114, a head drum assembly 120 is provided with a head 122 for reproducing the recording of a video tape.

In addition, the driving mechanism includes a capstan shaft 130 that is rotated by a capstan motor and a pinch roller 132 that is in close contact with the capstan motor so that the video tape is precisely maintained at a constant speed. The video tape is driven by the rotational force of the capstan shaft 130 by passing the video tape between the 130 and the pinch roller 132. At this time, the capstan shaft 130 rotates at a constant speed, and the pinch roller 132 compresses the video tape and rotates together by the rotational force of the capstan shaft 130.

Therefore, since the pinch roller 132 needs to have a high frictional force contacting the video tape in order to rotate together with the capstan shaft 130, the rubber 134 forms a part in contact with the video tape.

However, even if the outer surface of the pinch roller 132 is a rubber 134, if used for a long time, the surface of the rubber 134 is worn smoothly and the friction force is lowered, so it cannot be rotated accurately according to the rotation of the capstan shaft 130 Sliding phenomenon occurs. Therefore, the running speed of the video tape becomes irregular due to the sliding of the pinch roller 132, so that the head drum assembly 120 cannot accurately reproduce the signal recorded on the video tape. This phenomenon leads to a worse reproduction when reproducing a signal recorded at three times speed or seven times speed of narrow magnetic force lines as recording signals.

The present invention is devised to improve the conventional problem, the object of the present invention is to increase the friction force of the pinch rollers interlocked by the rotation of the capstan shaft to prevent the pinch rollers from sliding in contact with the video tape, This is to maintain a constant driving speed.

The above object can be achieved by forming a plurality of long grooves in the vertical direction in the rubber coupled to the outer peripheral surface of the pinch roller in close contact with the capstan shaft to provide a pinch roller of V-Cal to increase the frictional force.

1 is a perspective view schematically showing a driving mechanism of a typical V-Cal;

Figure 2 is a perspective view showing a pinch roller according to the present invention.

Figure 3 is a perspective view schematically showing a mechanism in which the pinch roller is installed according to the present invention.

Figure 4 is a plan sectional view showing a state of use of the pinch roller according to the present invention.

<Explanation of symbols for main parts of drawing>

10: pinch roller 12: rubber

14: long groove 16: central axis

18: rotating cylinder 20: capstan shaft

30 video tape 40 head drum assembly

42: head

It describes the configuration and operation of the pinch roller of V-Cal according to the present invention.

In the pinch roller according to the present invention, as shown in FIG. 2, the rotating cylinder 18 is rotatably coupled to the central axis 16, and the rubber 12 having frictional force is provided on the outer circumferential surface of the rotating cylinder 18. Combined. A plurality of long grooves 14 are formed in the rubber 12 at regular intervals in the vertical direction.

3 and 4, the pinch roller 10 moves to the capstan shaft 20 side in the regeneration mode or the double speed regeneration mode, and compresses the video tape 30 so that the video tape 30 is capstaned. It is conveyed by the rotational force of the shaft 20 to pass the head drum assembly 40 at a constant speed. At this time, the head 42 of the head drum assembly 40 picks up the magnetic force line signal recorded on the video tape 30 and transmits it to the signal processor, thereby reproducing the image and sound recorded on the video tape 30.

The capstan shaft 20 is rotated by a capstan motor, and the pinch roller 10 is driven by the rotation of the capstan shaft 20 while the rubber 12 and the rotating cylinder 18 press the video tape 30 to the center. Rotation about the axis 16 allows the rotational force of the capstan shaft 20 to be well transmitted to the video tape 30. Therefore, the video tape 30 travels the mechanism by the conveying force of the capstan shaft 20.

The surface of the rubber 12 of the pinch roller 10 is worn smoothly for a long time, but a plurality of long grooves 14 are formed on the surface of the rubber 12 so that the video tape 30 has a long groove of the rubber 12. (14) alternately contact with and without parts. Therefore, even if the rubber 12 slides, the distance is between one long groove 14 and the next long groove 14, so that the rubber 12 is hardly slipped and rotates together with the capstan shaft 20 to rotate the video tape 30. Transfer well.

Thus, the video tape 30 travels the mechanism at a constant speed in proportion to the rotation of the capstan shaft 20, thereby satisfactorily passing the signal recorded on the video tape 30 passing at the constant speed in the head drum assembly 40. Will play. In this manner, when the dominant speed of the video tape is constant, the head 42 of the head drum assembly 40 picks up the magnetic field lines accurately even when reproducing the recording signals at the 3x or 7x speeds in which the magnetic field lines are narrowly spaced. Will be played.

As described above, the present invention is formed by forming a plurality of long grooves 14 at regular intervals in the rubber 12 coupled to the outer peripheral surface of the pinch roller 10 in close contact with the capstan shaft 20 of the V-C in the vertical direction. As the part with and without the long groove 14 of the rubber 12 alternately contacts the video tape 30 and does not slip, the video tape 30 travels the mechanism at a constant speed in proportion to the rotation of the capstan motor. As a result, the signal recorded on the video tape 30 in the head drum assembly 40 can be satisfactorily reproduced.

Claims (1)

In the pinch roller 10 of V-C which the rubber 12 in close contact with the capstan shaft 20 is coupled to the outer circumferential surface of the rotating cylinder 18, V-pin pinch roller, characterized in that formed in the rubber 12 of the pinch roller 10 in the vertical direction a plurality of long grooves 14 at regular intervals.