JPS58177548A - Deciding device for perpendicularity of pinch roller - Google Patents

Abstract

PURPOSE:To improve operability for an adjustment of perpendicularity, by providing a decision part in the same direction with the supporting shaft of a pinch roller and arranging a detection shaft for indicating the scale of the decision part with its tip. CONSTITUTION:A base board 21 is set in a cassette chamber and cassette guide pins 3 and 4 are inserted into hole parts 211 and 212 to be positioned accurately. The base end part of the detection shaft 24 is inserted into a hole part 10 provided at the top of the arm 8 of the pinch roller 7. Then, a tape recorder is placed in a playback state and the arm 8 is rotated counterclockwise to bring the pinch roller 7 into press contact with a capstan shaft 6. In this state, the scale 231 of the decision part 23 is read with the tip of the detection shaft 24 and a decision on the perpendicularity of the pinch roller 7 is performed from the read scale value. Then, the pinch roller 7 is adjusted to an accurate perpendicular state by adjusting the screw part 81 of the arm 8 on the basis of the decision result to make a predetermined indication on the scale 231 of the decision part 23 with the tip of the detection shaft 24.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pinch roller perpendicularity determination device for determining the perpendicularity of a pinch roller used in a tape recorder.

Stabilization of tape running in a tape recorder is extremely important for achieving good sound and playback.

By the way, stable running of such a tape is determined by a capstan shaft and a pinch roller pressed against the capstan shaft, and at 1%, the pinch roller is vertically pressed against the capstan shaft, which is supported perpendicularly to the shear of the tape recorder. This is the deciding factor for stable driving.

Conventionally, to judge the perpendicularity of the pinch roller, the pinch roller is pressed against the capstan shaft and visually judged in this state, or the tape is actually run and judged visually from the running state of the tape. That's what I do.

However, this method that relies on visual inspection has the disadvantage that not only does the determination work require skill, but also a large number of hands, which impairs work efficiency and is extremely disadvantageous economically.

This invention was made to eliminate the above-mentioned drawbacks, and allows the perpendicularity of the pinch roller to be easily determined.

(2) An object of the present invention is to provide a pinch roller verticality determining device that can improve work efficiency for verticality adjustment and is also economically advantageous.

An embodiment of the present invention will be described below with reference to the drawings.

In this case, this embodiment shows an example in which the present invention is applied to determining the verticality of a pinch roller of a cassette tape recorder.

First, Fig. 1 shows a schematic configuration of the cassette chamber of a power tape recorder. 6 is a capstan shaft. Further, reference numeral 7 denotes a pinch roller which can be pressed against the capstan shaft 6, and this pinch roller 7 is supported at the tip of an arm 8 via a support shaft 9 so as to be freely rotatable in a vertical direction. This arm 8 is rotatably supported at its base end, and the pinch roller 7 is
It has a screw part 81 for adjusting the perpendicularity of the pinch roller 7, and a screw part 81 for determining the perpendicularity is located close to and parallel to the support shaft 9 of the pinch roller 7 at the tip where the pinch roller 7 is sunk. It has a hole lO. Note that 11 in the drawing is a magnetic head.

Next, the pinch roller perpendicularity determining device according to the present invention used in such a cassette tape recorder is constructed as shown in FIG. In the figure, 21 is the base;
This base 21 has holes 211 and 212 into which the cassette guide bins 3 and 4 of the cassette chamber described in FIG.
The cassette is set inside the room. A leg portion 22 having a predetermined height is vertically provided on this base #121,
A determining portion 23 is provided at the distal end of this leg portion 22 and extends upwardly from the Vincirolla rough. In this case, the judgment is 8g.
23 is kept parallel to the board surface of the base plate 21, that is, the bottom surface of the cassette chamber. Further, on the side surface of this determination unit 23, there is a scale 23 for determining the verticality of the pinch roller 7.
1 is attached. Reference numeral 24 denotes a verticality ejection shaft, and the base end of this detection shaft 24 is inserted into the hole 10 at the tip of the arm 8 of the pinch roller 7, and is provided in the same direction as the support @ 9 of the pinch roller 7. The scale of the determination section 23 is indicated by the reference numeral 23. In this case, the base end of the determination shaft 24 is formed into a tapered shape to prevent the determination shaft 24 from wobbling when attached.

Next, its effect will be explained.

First, the base plate 21 is set on the cassette holder.

In this case, the base plate 21 has the cassette guide bins 3 and 4 in the hole 2.
11, 212J is inserted through the cassette chamber, and its end portion is pressed by the cassette holding spring 5 to accurately position it in the cassette chamber. Further, the base end of the detection shaft 24 is inserted into the hole 10 at the tip of the arm 8 of the pinch roller 7.

Next, the tape recorder is placed in a playback state, and the set recorder arm 8 is rotated counterclockwise in the figure to bring the pinch roller 7 into pressure contact with the capstan shaft 61.

In this state, the scale 231 of the determination unit 23 is located at the tip of the detection shaft 24.
By reading the scale value at this time, the verticality of the pinch roller 7 can be determined. Then, based on this determination result, the pinch roller 7
can be adjusted to a precise vertical position.

Therefore, with this configuration, the perpendicularity of the pinch roller in the state in which the pinch roller is in pressure contact with the capstan shaft, that is, in the state in which the tape is running, can be easily determined based on the indication from the detection shaft, which is different from the conventional visual inspection. Since no skill is required for the comparison and determination work, the workability for adjusting the verticality can be improved accordingly, labor can be saved, and it can be economically advantageous. In addition, since the detection axis for detecting the verticality of the pinch roller has a long pitch several times the height of the pinch roller, the verticality of the pinch roller can be determined with high precision, and this determination result number can be used to determine the verticality of the pinch roller. The verticality adjustment based on ζ can be performed very accurately.

Note that the present invention is not limited to the first embodiment described above, and can be implemented with appropriate modifications within the scope without changing the gist.

For example, the leg portions 22 may have variable height dimensions. In this way, the accuracy of the verticality of the pinch roller can be left as desired. Furthermore, in the above description, the detection shaft 24 is inserted into the perpendicularity determination hole 10 provided at the tip of the arm 8 of the pinch roller 7, but the shaft 9 of the pinch roller 7 is hollow, and the detection shaft 24 is inserted into the hollow part. 24 may be inserted.

Further, although an example in which the present invention is applied to a cassette tape recorder has been described above, it is also possible to apply the present invention to other tape recorders.

As described above, according to the present invention, the perpendicularity of the pinch roller can be easily determined, the workability for adjusting the perpendicularity can be improved, and an economically advantageous hole for determining the perpendicularity of the pinch roller can be provided. .

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of a cassette chamber of a cassette tape recorder to which the present invention is applied, and FIG. 2 is a schematic block diagram showing an embodiment of the present invention. 1.2...Reel 3.4...Cassette guide bin 5...Cassette holding spring

Claims (4)

[Claims] (1) A base, a leg having a predetermined height provided on the base, and a scale provided on the tip of the leg so as to remain parallel to the board surface of the base and for determining vertical displacement. 1. A pinch roller verticality determining device, comprising: a determining section marked with , and a detection shaft that is provided in the same direction as the support shaft of the pinch roller and that indicates a scale of the determining section at its tip. (2) The detection shaft is inserted into a hole provided in the arm having the pinch roller, which is close to and parallel to the support shaft of the pinch roller. The described pinch roller verticality determination device. (3) The pinch roller perpendicularity determining device according to claim 1, wherein the ejection shaft is inserted into a hollow portion of a hollow support shaft of the pinch roller. (4) The pinch roller perpendicularity determining device according to any one of claims 1 to 3, wherein the leg portion is made variable in height.