JPH0227401Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a capstan mechanism, and more particularly to a capstan mechanism used in a magnetic tape recording/reproducing device.

Generally, a magnetic tape recording/reproducing apparatus includes a capstan mechanism including a capstan, a capstan motor that drives the capstan, and a pinch roller that is pressed against the capstan shaft during constant speed running.

Conventionally, as shown in FIG. 1, this type of capstan mechanism holds a capstan motor 11 having a capstan 11a on a base 10 and a pinch roller 12 that is pressed against the capstan, and is rotatable around a support shaft 13. Pinch roller holding bracket 1
4, and a solenoid 17 for transmitting the tensile force F1 via the pinch roller holding fitting 14 and the plunger 17a. The tensile force F1 from the solenoid 17 is applied to the plunger 17a.
It is transmitted to the connecting rod 16 via the connecting rod 16, and further transmitted to the pinch roller 12 via the pinch roller holding fitting 14. This pinch roller 12 is pressed onto the capstan shaft 11a with a force F2 via a magnetic tape 19. Here, the relationship between F1 and F2 depends on the dimensions of the holding fitting 14, but the force F
A force F3, which is a vector combination of 1 and F2, is added, and a bending force is applied to the shaft 13.

Therefore, the forces F1 and F2 are applied to the shaft 13 by, for example, 4.
Kg, in the worst case, 8 Kg will be applied, and even in the configuration shown in FIG.
Due to the tilting of the surface, an inclination of several micrometers to several tens of micrometers occurs.

For this reason, in the conventional capstan mechanism, the parallelism with the capstan shaft 11a becomes out of order, making it impossible to run the magnetic tape 19 normally and causing deformation of the tape. Further, in the conventional capstan mechanism, since the solenoid 17 is exposed on the tape running surface, it has the disadvantage that it generates noise in the magnetic head and the like, and the sound generated from the solenoid and the like can be heard loudly.

SUMMARY OF THE INVENTION An object of the present invention is to provide a capstan mechanism that eliminates the drawbacks of conventional capstan mechanisms and allows a magnetic tape to run normally.

Still another object of the present invention is to provide a capstan mechanism that keeps sources of unnecessary noise generated from mechanisms such as solenoids away from the tape running system.

According to the present invention, in a capstan mechanism used in a magnetic tape recording/reproducing device, the capstan mechanism includes a capstan for feeding the magnetic tape, a capstan motor, a pinch roller, and a pinch roller holding fitting to which the pinch roller is swingably attached. A solenoid mechanism that generates a force that presses the pinch roller against the capstan, a solenoid mechanism that is swingably supported, transmits the tensile force of the solenoid to one end, and a pinch roller that is located approximately in the center of the pinch roller in the height direction at the other end. A capstan mechanism is obtained, including a transmission mechanism having a lever provided with a roller so as to push the holding fitting, and characterized in that the pinch roller holding fitting and the lever are mechanically separated.

Further, according to the present invention, the solenoid of the solenoid mechanism is disposed approximately parallel to the axis of the capstan motor, and is provided below the base supporting the pinch roller holding fitting. The described capstan mechanism is obtained.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 2 shows a capstan mechanism which is an embodiment of the present invention.

In FIGS. 2a and 2b, one embodiment of the present invention is used in a magnetic tape recording/reproducing device, and a magnetic tape 1
The capstan mechanism 30 has a capstan drive mechanism 30 having a capstan motor 31 having a capstan shaft 31a, and a pinch roller 41 that presses onto the capstan shaft 31a of the drive machine 30 via a magnetic tape 25. A pinch roller holding mechanism 40, a pressure force transmission mechanism 50 that transmits pressure force to the pinch roller mechanism 40, and a pressure force generation mechanism 60 that causes the transmission mechanism 50 to generate pressure force.
including.

The capstan drive mechanism 30 is configured such that a capstan motor 31 is attached to the lower side of a base (substrate) 20, and a capstan shaft 31a protrudes above the base.

The pinch roller holding mechanism 40 is attached to the upper side of the base 20, and rotatably holds a shaft 41 attached to the base 20 and a pinch roller 42, and the pinch roller is swingably attached to the shaft 41. The pinch roller 42 can be pressed onto the capstan shaft 31a via the magnetic tape 25.

The crimp force transmission mechanism 50 includes a support member 51 attached to the upper side of the base 20, and a shaft 5 attached to the support member 51.
A lever 53 is swingably attached via 2.
and a roller 54 attached to one end of the lever 53.
and a bracket 55 attached to the other end of the lever 53. The roller 54 presses the pinch roller holding structure when a pressing force is generated, and is configured to press approximately the center portion of the pinch roller in the height direction or approximately the center portion of the magnetic tape in the width direction.

The crimping force generation mechanism 60 is attached to the lower side of the base 20, and is attached to a solenoid 61 arranged in parallel with the axis of the capstan motor 31, and a plunger 61a of the solenoid 61, and is attached to the crimping force transmission mechanism 5.
A connecting rod 62 that engages with the bracket 55 of No. 0, a pressing force generating spring 63 that is inserted into the connecting rod 62 and presses the bracket, and an adjusting screw 64 that adjusts the tensile force of the spring and adjusts the pressing force. The return spring 65 presses the bracket 55.

Next, to explain the operation of this embodiment, when current is passed through the solenoid 61, the plunger 61
a is pulled downwards and the connecting rod 62 is pulled down in the direction of arrow F under the force of the return spring which normally pushes it upwards. The connecting rod 62 further pushes the pressing force generating spring 63 by an amount determined by the pressing force adjusting screw and stops. Therefore, a rotational moment in the direction of arrow A is transmitted to the lever 53 around the shaft 52 via the bracket 13, causing the roller 54 to work in the direction of arrow F' (to the left).

The roller 54 is normally in contact with the back side of the pinch roller holding fitting 41 at a height G at the center of the width n of the pinch roller 42, and the roller moving in the direction of arrow F' moves the pinch roller 42 to the capstan shaft 31a. It is pressed with a uniform force over the width n and the entire length.

At this time, the pinch roller 42 receives a reaction force in the direction F'', but since this force does not give any moment in the direction of tilting the support shaft 41, the pinch roller 42 and the capstan shaft 41
The parallelism with 1a does not change. Furthermore, although the support member 51 tilts to the right due to the force in the F'' direction, the force generated by the pressure adjustment spring 63 does not substantially change, so the pinch roller pressure does not change.

Furthermore, in this embodiment, the solenoid 61 is connected to the base 2.
0, it reduces the possibility that leakage flux will have an adverse effect on the magnetic head etc. on the tape running system, and the escape hole required in the tape running system base (not shown) is small. A structure with less reduction in strength of the base can be obtained.

In one embodiment of the present invention, the plunger solenoid 61 and the capstan motor 31 are disposed parallel to each other's axes, and the output end of the plunger is moved around an axis in a horizontal direction perpendicular to the axis by means of the crimp force transmission mechanism 50. In place of the rotational movement of the lever 53, the roller 5 provided at one end of the pressing force transmission mechanism 50
4 to push the pinch roller holding mechanism 40, and has a structure in which the pressing force transmission mechanism 50 and the pinch roller holding mechanism 40 are separated.

Furthermore, in this embodiment, since the roller 54 of the pressing force transmission mechanism 50 presses the intermediate portion of the pinch roller holding fitting 43 of the pinch roller in the tape width direction, the bending moment is not applied to the support shaft 41, and the capstan shaft 31a is The tape is brought into contact with uniform pressure in the tape width direction.

As explained above, the present invention has the effect that the parallelism between the capstan shaft and the pinch roller does not change at all times by configuring the pinch roller mechanism and the pressure force generation/transmission mechanism to be independent.
Furthermore, since the solenoid is provided below the base, it has the effect of soundproofing the sound from the solenoid.

[Brief explanation of the drawing]

1A and 1B are a top view and a side view of a conventional capstan mechanism, and FIGS. 2A and 2B are a top view and a side view of a capstan mechanism according to an embodiment of the present invention. 30... Capstan mechanism, 31... Capstan motor, 31a... Capstan shaft, 40...
...Pinch roller mechanism, 41... Support shaft, 42...
Pinch roller, 43...Pinch roller holding fitting,
50...Crimping force transmission mechanism, 51...Support member, 5
2...Shaft, 53...Lever, 54...Roller, 5
5... Bracket, 60... Solenoid mechanism, 6
1...Solenoid, 61a...Plunger, 62
...Connecting rod, 63... Spring for generating pressure force, 64...
...Crimping force adjustment screw, 65...Return spring.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A capstan for feeding a magnetic tape, a capstan motor, a pinch roller, and a pinch roller holding bracket on which the pinch roller is swingably attached, which are used in a magnetic tape recording and reproducing device. In the capstan mechanism, the capstan mechanism includes a solenoid mechanism that generates a force that presses the pinch roller against the capstan, and a solenoid mechanism that is swingably supported, transmits the tensile force of the solenoid to one end, and has a solenoid mechanism approximately at the heightwise center of the pinch roller at the other end. 1. A capstan mechanism comprising: a transmission mechanism having a lever provided with a roller so as to push a pinch roller holding fitting, the pinch roller holding fitting and the lever being mechanically separated. (2) The capstan mechanism according to claim 1, wherein the solenoid of the solenoid mechanism is disposed approximately parallel to the axis of the capstan motor, and is provided on the lower side of a base that supports the pinch roller holding fitting. .