JPS5813480Y2 - Tape tension addition device for tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape tension applying device for a three-head cassette tape recorder, and its purpose is to simplify the structure and stabilize the tape tension.

A tape cassette in which tape is wound around two reel hubs is provided with a pad for elastically pressing the tape against a head that is inserted into an opening provided in the center of the side surface of the case.

However, in a three-head cassette tape recorder using a combination recording/playback head, the recording gap and playback gap are wide apart, so the pad cannot be brought into pressure contact with both gaps.

Therefore, it became necessary to increase the tape tension in order to increase the pressure force on the tape head, and a two-capstan drive force type was adopted, but this was complicated and expensive, and the tape A method is used in which tape tension is applied using the frictional force of felt crimped upstream, but this method is also subject to large changes in temperature, humidity, and aging, etc.
Conventional products each had their own drawbacks.

The present invention eliminates the above-mentioned conventional drawbacks, and the structure thereof will be explained below with reference to the drawings shown as embodiments.

1 is a tape cassette with a tape 2 inside, an opening 3 is formed in the center of the side surface, and small openings 4, 5 and pinch roller openings 6° and 7 are formed in parallel on both sides of this opening 3. has been done.

8 and 9 are openings for capstan insertion, 10.11 are positioning holes, 12 are pads attached to tape cassette 1, and 1
3 is the head board, recording/playback combination head 1
4 and an erasing head 15 are attached with screws, and are moved linearly back and forth by constant tape feeding operation.

A pinch roller arm 16 is rotatably attached to a shaft 17 fixed to the head substrate 13, and is rotated clockwise by a spring 19 stretched between the end hook portion and a pin 18 on the head substrate 13. The movement is biased.

The pinch roller arm 16 is configured such that a protrusion is inserted into a hole in the head substrate 13 to prevent clockwise rotation beyond a certain degree (not shown).
.

A pinch roller 20 is rotatably attached to a shaft 21 fixed to the pinch roller arm 16.

22 is a capstan that is pressed by the pinch roller 20.

A roller 23 is rotatably attached to a stepped shaft 24 fixed to the head substrate 13, and an auxiliary roller 23a forming a boss portion is inserted into the lower end of the roller.

A friction arm 26 is rotatably attached to a shaft 21 fixed to the head substrate 13, and has a bent portion at a position below the roller 23 facing the sub-roller, and a load means is attached to the bent end. A friction member 28 such as felt is provided.

Reference numeral 29 denotes a tape tension detection member integrally formed with the friction arm 26, which is made of a low-friction material such as a molded product, and is disposed so that its end faces the tape 2 on the downstream side of the tape running section than the roller 23. has been done.

Reference numeral 30 denotes a pin 31 fixed to the head substrate 13 and a spring applied to a protrusion of the friction arm 26, which urges the friction arm 26 in a counterclockwise direction.

Rotation of the friction arm base is regulated by the friction member 28 coming into pressure contact with the auxiliary roller 23a.

Therefore, when the roller rotates, a load is applied to it.

The present invention adopts the above-mentioned configuration, so when the tape is fed at a constant speed, the row 223 is inserted through the pinch roller opening γ, comes into contact with the tape 2, and the tape tension detection member 29 is also inserted into the pinch roller opening γ. It is inserted through the opening 1 and comes into contact with the tape 2 on the tape downstream side of the roller 23.

The tape 2 is driven by a capstan 22 and a pinch roller, but on the upstream side of the tape, a roller 23 is rotated by the tape 2, and a friction member 2 is attached to the roller 23.
8, the capstan 22
Tape tension is added between the recording/playback combination head 14 and the roller 23 to apply an appropriate tape pressing force to the recording/playback combination head 14.

On the other hand, when the tension of the tape 2 becomes stronger, the tape tension detection member 29 is moved backward, and the friction arm 26 overcomes the biasing force of the spring 30 and rotates clockwise. At the same time, the friction member 28 also rotates, and The pressing force on the roller 23a is reduced.

That is, it acts to reduce tape tension.

Conversely, when the tape tension decreases, the pressure contact force of the friction member 28 increases, thereby acting to increase the tape tension.

By adjusting the pressing force of the friction member 28 in this manner, the tape tension can be made constant.

In the above embodiment, the load means is based on frictional force, but a load means using eddy current or magnetism is used, and the detection means electrically adjusts the load means by converting the displacement into a change in resistance value. Similar effects can be obtained by using any other method.

As mentioned above, in a tape recorder using a tape cassette, this invention applies tape tension to the upstream side of the tape running, thereby providing a stable tape pressing force to the playback/recording co/bination head, thereby stabilizing the tape running. Moreover, since the roller is driven by the tape to rotate, there is no possibility of tape particles falling off, which is the case with systems in which frictional force is applied to the tape by a fixed object.

If the material and position are set so that there is no slip between the roller and the tape, the load is determined only by the friction between the friction member and the auxiliary roller, so there is no change in load due to different tapes, and the friction member By adding means such as providing grooves on the opposing sub-rollers, load fluctuations due to changes in temperature, humidity, etc. can be reduced and the temperature and pressure can be stabilized.

Furthermore, with the configuration of the present invention, there is no need to provide additional components to the tape cassette, and it is only necessary to provide rollers, friction members, chip/joist detection members, etc. on the device side, so a general tape cassette can be used. Its practical effects are great.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the tape tension applying device according to the present invention, with a portion thereof peeled off. FIG. 2 is a sectional view taken along the line AA in FIG. 1. 1...Tape cassette, 2...Tape, 3...
Opening hole, 13...Head board, 23...
Roller, 23a... Subroller, 26...
-Friction arm, 29...Tape tension detection member.

Claims (1)

[Scope of utility model registration request] A hole for inserting a pinch roller, a recording/playback combination head, and an erasing head is provided on the side surface of the tape cassette, and the capstan is inserted through one of the holes provided in the tape cassette, and the tape is inserted by the pinch roller. In a tape recorder equipped with a capstan that is pressed into contact with the capstan, a roller that rotates as the tape runs and an auxiliary roller that is smaller in diameter than this roller are integrated into a stepped shaft that is fixed to the head board on the upstream side of the tape travel. a tape tension detecting member rotatably provided in the cassette at a position on the downstream side of the tape running path from the roller and inserted through an opening in the cassette and in contact with the tape; and a friction member that presses the auxiliary roller on the same friction arm, and this friction arm is rotatable about a shaft fixed to the head substrate and biased by a spring in the direction of pressing the friction member. A tape tension adding device for a tape recorder, characterized in that the tape tension is controlled to be constant when the tape is fed at a constant speed by the capstan and the pinch roller.