JPS6213243Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a device for vertically adjusting the pinch roller in a tape recorder, and is particularly useful in cassette tape recorders with a dual capstan drive system or an auto-reverse single capstan drive system, to stabilize magnetic tape. The present invention relates to a pinch roller vertical adjustment device that adjusts the running position of a magnetic tape necessary for running it.

FIG. 1 shows a conventional pinch roller vertical adjustment device, in which 1 is the chassis of a tape recorder, 2 is the pinch arm shaft fixed to the chassis 1, and 21 is the shaft 2.
A threaded portion formed at the upper end, 3 a pinch arm rotatably supported by the shaft 2, 4 an adjusting spring that presses the pinch arm 3 upward, 5 screwed into the threaded portion 21 of the shaft 2, This is an adjustment nut that holds the pinch arm 3 against the pressing force of the adjustment spring 4. Although not shown, a shaft parallel to the pinch arm shaft 2 is formed at the end of the pinch arm 3, and a pinch roller is rotatably supported on this shaft. In this configuration, if the screw 21 and nut 6 of the pinch arm shaft 2 are right-handed, when the nut 6 is rotated clockwise, the adjuster spring 5 becomes slack, the pinch arm 3 and the pinch roller are lowered, and the nut 6 is rotated counterclockwise. When the pinch arm 2 and the pinch roller are rotated in this direction, the pinch arm 2 and the pinch roller are raised by the pressing force of the spring 5, so that the pinch roller can be adjusted up and down by the nut 6. However, the adjusting device having such a configuration has the following drawbacks.

During adjustment, a load is applied to the pinch arm axis, and there is a risk of losing verticality, which is important for accuracy.

If the threaded part of the pinch arm shaft and the through hole of the pinch arm overlap, play may occur.
The parallelism of the pinch arm and chassis is lost.

This invention was developed in view of the above-mentioned drawbacks of the conventional art, and its purpose is to provide a vertical adjustment device for a pinch roller that maintains the precision of the shaft by not directly applying external force to the pinch arm shaft.

This invention will be explained in detail below with reference to the drawings from FIG. 2 onwards.

2 to 4 show an embodiment of this invention, and the chassis 1, pinch arm shaft 2, pinch arm 3, and adjuster spring 4 are the same as those shown in FIG. 1, and their explanation will be omitted. 6 is biased upward by the adjuster spring 4, and the pinch arm shaft 2
This pinch roller is supported by a pinch arm 3 which is rotatably supported by the pinch roller 6, and the pinch roller 6 is rotatable with respect to the pinch arm 3. Reference numeral 7 designates an adjusting arm that is disposed outside the pinch arm 3 and is rotatably supported by the pinch arm shaft 2. The adjusting arm 7 is biased downward from above the pinch arm shaft 2 by a compression spring 8. At the same time, a tap is formed at a position away from the pinch arm shaft 2, and an adjuster screw 9 is formed.
has been concluded. The tip of this adjuster screw 9 is brought into contact with the pinch arm 3. In addition,
The biasing force of the compression spring 8 is made larger than the biasing force of the adjusting spring 4. Furthermore, as shown in FIG. 4, the pinch arm 3 and the adjuster arm 7 are formed to have a U-shaped cross section, and are constructed so as not to play with respect to the pinch arm shaft 2, and are integral with the pinch arm shaft 2. It is made to be able to rotate.

In the pinch roller vertical adjustment device configured in this way, by turning the adjuster screw 9 to the right or left, the pinch arm 3 moves up and down with respect to the pinch arm shaft 2, and is supported by the pinch arm 3 accordingly. The pinch roller 6 is moved up and down.

As described above, this invention has a configuration in which the pinch arm is moved up and down with respect to the adjustment arm by adjusting the adjustment screw formed on the adjustment arm, and thereby the pinch roller can be adjusted up and down. As a result, the pinch roller can be adjusted up and down without applying any load to the pinch arm shaft, and the pinch arm that supports the pinch roller rotates smoothly, reducing the pinching force that the pinch roller exerts on the magnetic tape together with the capstan shaft. It can be made stable.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a conventional pinch roller vertical adjustment device, and FIGS. 2 to 4 are a side view, a top view, and a rear view, respectively, showing an embodiment of this invention. 2...Pinch arm axis, 3...Pinch arm,
4...Adjustment spring, 6...Pinch roller, 7
...Adjustment arm, 8...Crimp spring, 9...
Asiast Bis.

Claims (1)

[Scope of utility model registration request] A pinch arm shaft fixed to the chassis;
a pinch arm biased by an adjustment spring, rotatably supported on the pinch arm shaft, and holding a pinch roller; and an adjustment arm biased by a compression spring, rotatably supported on the pinch arm shaft, and positioned outside the pinch arm, wherein an adjustment screw is fastened to the adjustment arm at a position away from the pinch arm shaft, and the pinch arm can be adjusted up and down relative to the adjustment arm by adjusting the adjustment screw.