JPH0110773Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cassette-type tape tension measuring gauge whose purpose is to prevent contamination of the tape exposed in the window of the cassette.

A cassette-type tape tension gauge is used to measure the tape driving force caused by the frictional force between the capstan of a cassette tape recorder and the pinch roller. This gauge connects the measuring reel on the tape delivery side built into the cassette and the take-up reel with tape, and stretches a portion of the tape along a window hole drilled in the cassette corresponding to the capstan. Because of this, people may accidentally touch the tape surface with their fingers while handling it before use. In particular, when removing a gauge cassette from the case, but also when holding this type of cassette by hand, it is often the case that the front and back sides of the cassette are grasped, so it is necessary to hold the gauge cassette through a window hole drilled in the front of the cassette. Hands and fingers touch the tape surface, resulting in contamination.

By the way, a normal cassette is loaded into a tape recorder and records and plays while running the tape by rotating both reels.
Even if the tape is locally contaminated, it has almost no effect on the feed driving force of the pinch roller. However, the tension gauge, which measures the tape driving force due to the frictional force between the capstan and the pinch roller, The tape is pulled against the elasticity of a built-in spring to measure the relative displacement between the inner ring and outer ring of the measuring reel fixed to the cassette, so the movement of the tape is extremely small within the range of the scale. If a part of the tape, especially the part of the tape facing the window in contact with the pinch roller, becomes contaminated with oil from fingers or the like, slips occur during measurement, which causes measurement errors.

The present invention solves the above problems by removably attaching a guard label to the cassette that covers the exposed surface of the tape facing into the window hole of the cassette, thereby preventing contamination of the tape during handling, especially before using the measuring gauge. It is designed to prevent this. That is, the present invention is a cassette-type tape tension gauge for measuring the driving force of a tape driven by the rotational friction force between the capstan and the pinch roller of a tape recorder. A cassette-type tape tent characterized in that a guard label having a U-shaped cross section and comprising a connecting part that covers the pushing window hole of the pinch roller and protects the tape facing inside the window hole is removably attached to the cassette. This is a measurement gauge. Embodiments of the present invention will be described below using figures. In FIGS. 1 and 2, the cassette type tape tension measuring gauge has the following construction. That is, a measuring reel 2 and a take-up reel 3 are built into a transparent cassette 1 consisting of a pair of cassette halves, and a tape 4, which is fixed at one end to the measuring reel 2 and wound several times, is opened in the front of the cassette 1. The other end is connected to the take-up reel 3. The measuring reel 2 consists of an inner ring 2a fixed to the cassette 1 and an outer ring 2b with a tape 4 attached to a part of the circumference.
a and 2b are arranged concentrically, connected by a spiral spring 6 between the two wheels, and a pointer 7 is attached to the inner ring 2a.
A scale 7 is attached to the outer ring 2b.

The window hole 5 is a hole for inserting a pinch roller P, as shown in FIG. It is opened. In this case, a guard label 9 covering the window hole 5 is placed in a cassette 1.
A tape 4 is removably attached to the window hole 5 and faces into the window hole 5.
It protects the In addition to the window hole 5 for the pinch roller P, the cassette 1 has windows for the recording and playback heads, and a reference hole. Since the tape 4 is pulled out toward the window hole 5, the tape 4 cannot be touched by fingers through any other window hole other than the window hole 5, and it is sufficient to cover the window hole 5 with the guard label 9. Of course, it may also cover the entire front surface of the cassette 1, spanning the window hole 5 and other window holes.

The guard label 9 is made of synthetic resin, metal, or a piece of paper and processed into a U-shape, and the upper and lower edges sandwich the cassette 1, and the connecting part of the upper edge covers the window hole 5. Alternatively, the guard label 9 may be fixed with a set screw 10 inserted into the insertion hole 8 of the capstan C.
Alternatively, pins may be provided protruding from the inner surfaces of the upper and lower edges, the guard label 9 is opened against the elasticity of the material, each pin is inserted into the insertion hole 8, and the guard label 9 and the cassette 1 are attached. It is also possible to attach felt to the side of the guard label 9 facing the window hole 5 and to impregnate the felt with a cleaning liquid.

When using the measuring gauge of the present invention, the guard label 9 is removed and the tape tension is measured by loading it into a tape recorder as usual, but when removing the gauge from the case etc. Even when the tape is grasped, the guard label 9 blocks the tape surface from being touched by the fingers, thus preventing the tape from being contaminated and allowing highly accurate measurement. After use, the guard label 9 is attached to the cassette 1 again to protect the tape surface.

Since the present invention is constructed as described above, the tape is not contaminated with dust or finger oils while the measuring gauge is in storage or before use, making it possible to perform highly accurate measurements. By attaching felt or the like to the label 9 and impregnating it with a cleaning liquid, the tape surface is cleaned each time the measuring gauge is used, and the tape surface can always be kept clean during repeated use.

Therefore, according to the present invention, although the structure is simple, it is possible to effectively prevent contamination of the tape surface, measure the tape driving force by the capstan and pinch roller with high accuracy, and improve the quality of the tape recorder. It has the effect that it can.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional plan view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line -- in FIG. 1, and FIG. 3 is a perspective view with the guard label removed. 1...cassette, 4...tape, 5...window hole, 9...guard label, P...pinch roller, C...capstan.

Claims (1)

[Claim for Utility Model Registration] In a cassette-type tape tension gauge for measuring the driving force of a tape driven by the rotational friction force between the capstan and the pinch roller of a tape recorder, A cassette characterized in that a guard label having a U-shaped cross section and comprising a connecting portion that covers the opened push-in window hole of the pinch roller and protects the tape facing inside the window hole is removably attached to the cassette. Type tape tension measuring gauge.