JPS6023820Y2 - Pad pressure measurement device for tape cassettes - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for measuring the pressure force of a pad that pressures a tape onto a head during recording and playback of a cassette tape.

Generally, when recording and playing back a recording tape, the adhesion between the tape and the head is the most important factor that determines the characteristics during recording and playback.

Incidentally, a tape cassette has a pad built into the cassette case that supports the back side of the tape so that it can be brought into close contact with the head of a tape recorder during recording and playback.

This pad is made of a metal elastic piece with a shock absorber attached, and is assembled into the case when the cassette is assembled.The pressure against the tape depends on the conditions at the time of assembly, so it is difficult to manage the pad pressure during cassette production. is necessary.

However, in the past, there was no dedicated device to measure this pad pressure, and workers had to manually measure it using handheld measuring instruments, resulting in variations in measurement accuracy and uniform tape pressure. The disadvantage was that it was difficult to obtain suitable products.

This proposal solves the above problems and provides a device that can accurately measure the pad pressure for each product under the same conditions.It includes a holding frame that holds the cassette in a fixed position, and a device that can be moved forward and backward toward the holding frame. A tension gauge placed on the cassette is placed on a base, and the tip of the rod of the tension gauge, which is biased by a spring, has a feeler that presses against the pad inside the cassette, and the rod is brought into contact with the edge of the cassette and inserted into the cassette. It is characterized by being equipped with a flange that regulates the amount of entry of the tentacle.

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

In the figure, a holding frame 2 for a tape cassette C and a feeding base 4 for a tension gauge 3 are installed on a base 1, facing the holding frame 2.

As shown in FIG. 3, the feed table 4 has a guide groove 5 facing the holding frame 2, and the slider 7 is slidably engaged with the guide groove 5.

The slider 7 is supported by a trochanter 6 interposed within the guide groove 5.5 so as to be able to move smoothly in the horizontal direction.

A rod-shaped tension gauge 3 is attached to the upper surface of the slider 7 by a holder 8 with bolts 9.

The tension gauge 3 has a cylindrical body 10 as shown in FIG.
A rod 13 is inserted and held therein through front and rear bearings 11 and 12 so that it can move forward and backward. A front spring receiver 14 is fixed to the rod 13, and a rear spring receiver 15 is mounted on the rod 13.
A compression coil spring 16 is interposed between the cylindrical body 9 and the rear spring bearing 15, and the rear spring bearing 15 is supported by an adjustment screw 17 screwed into the rear part of the cylinder body 9 through the rear bearing 12.

Further, an indicator 18 provided on the front spring receiver 14 faces into a long hole 19 formed in the cylinder 10, and is made to correspond to a scale 20 marked on the outer surface of the cylinder 10.

At the tip of the rod 13 is a pad P built into the cassette C.
A contactor 21 is provided on the circumference of the rod 13 at a certain distance from the contactor 21 and brought into contact with the front edge of the cassette C to restrict the amount of entry of the contactor 21 into the cassette C. Attach the flange 22.

This tension gauge 3 is provided with a handle 23 as a feeding device.

That is, a handle 23 is rotatably supported on the base 1, and a retainer 25 at the tip of a rod 24 interlocked with the handle 23 is fitted into a long groove 26 formed on the lower surface of the slider 7. The rod 24 is moved by operating the handle 23.
When the tension gauge 3 is rotated back and forth, the slider 7 moves integrally along the guide groove 5 in accordance with the direction of rotation, thereby moving the tension gauge 3 forward and backward.

In the embodiment, a tape cassette C is set on the holding frame 2.

As is well known, the tape cassette C has a built-in pad P behind the running surface of the tape T along the front edge of the cassette.

By setting the tape cassette C on the holding frame 2, the pad P faces the front of the rod 13.

When the tension cage 3 is moved forward along the guide groove 5 by operating the handle 23 in this state, first, the feeler 2
1 presses the pad P from the surface of the tape T, and the feeler 21 enters into the cassette C. Then, the flange 22 contacts the front edge of the cassette C, and the entry of the feeler 21 is blocked.

As a result, the rod 13 receives a repulsive force from the pad P, the indicator 18 is relatively displaced within the elongated hole 19, and the indication appears on the scale 20.

The value indicated on the scale when the flange 22 contacts the front edge of the cassette C is read as the pad pressure force.

In this case, the scale is calibrated by the following operation.

That is, in FIG. 2, the block 28 to which the pulley 27 is attached is held by a pin or screw 29 set on the base 1, tightened and fixed with a wing nut 33, and the tension gauge 3
The tension gauge 3 is moved backward and fixed at the end of its stroke.

A string 30 with one end tied to the end of this rod 13,
A predetermined weight 31 is tied to the other end of the string 30, and the adjustment screw 17 is rotated with the weight of the weight 31 acting on the rod 13 to adjust the amount of compression of the spring 16. This is done by changing the weight of the weight 31 and matching the indicated value of the scale 20.

Note that during normal measurement, block 28 is connected to pin 2.
Pin 3 removed from 9 and installed on base 1 on the side of feeder 4
2, secure it on the base 1 with the wing nut 33, and store it.

In this case, the tension gauge 3 is advanced with respect to the tape cassette C set on the holding frame 2 on the base 1 as described above, and the feeler 21 provided on the rod 13 of the tension gauge 3 is moved forward.
The approach amount is regulated by the flange 22, and the contactor 21 is brought into pressure contact with the pad P. Therefore, the pressure of the pad can be accurately measured with a simple operation, and the pressure of each pad can be measured for each cassette. Since both can be measured under the same conditions, product quality control becomes easier and high-quality products can be provided to the market.

Further, according to the present invention, by appropriately using the block 28 that is always stored on the base 1, the scale of the tension gauge 3 can be easily calibrated, and it also has the effect of always being able to perform highly accurate measurements. be.

[Brief explanation of drawings]

Fig. 1 is a plan view showing one embodiment of the present device, Fig. 2 is a side view of the same, Fig. 3 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 4 is a longitudinal sectional view of the tension gauge. . 1...Base, 2...Holding frame, 3...
...Tension gauge, 4...Feed stand, 16
... Spring, 21 ... Tentacle, 22 ...
...Flange, 23...Handle, 24...
...Rod, C...Cassette, P...
...Pad, T...Tape.

Claims (1)

[Scope of utility model registration request] A holding frame that holds the tape cassette in a fixed position and a tension gauge that moves forward and backward facing the holding frame are installed on a base, and the tip of the rod of the tension gauge that is biased by a spring is attached to the pad of the cassette. A device for measuring pad pressure force in a tape cassette, characterized in that it is equipped with a pressing contact and a flange that comes into contact with the front edge of the cassette to regulate the amount of entry of the contact into the cassette.