JPS5843081Y2 - Tape drive device in tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape drive for use in tape recorders.

Generally, in a tape recorder, a pinch roller is used to press the magnetic tape against a capstan rotating at a constant speed in order to cause the magnetic tape to run at a constant speed.

A shift pin is also used to separate the magnetic tape from the magnetic head when the magnetic tape is run at high speed (early return, etc.).

Since these pinch rollers and shift pins are moved together when the magnetic tape is run at a constant speed, it is desirable that they be driven by the same electromagnetic plunger.

Incidentally, when the magnetic tape is temporarily stopped, the pinch roller must be separated from the capstan, but it is desirable that the magnetic tape be in contact with the magnetic head.

It is also desirable to keep the pinch roller away from the capstan and keep the magnetic tape in contact with the magnetic head during the transition period when the running direction of the magnetic tape is reversed during constant speed running.

If the magnetic tape is separated from the magnetic head by the shift pin during the above-mentioned pause, there is a possibility that it will be peeled off during recording, leaving unerased parts on the magnetic tape, and there is also a risk that a click sound will be recorded, and there is also a risk of starting the sound or starting the beginning of the sound. Operation becomes impossible.

If the pinch roller is pressed against the capstan when reversing the running direction of the tape, the load will be large and the rise of the tape will be delayed, and if the tape leaves the head, the tape will come into contact with the head again. When this occurs, unnecessary vibrations may be applied to the tape, causing a temporary fluctuation in the running speed of the tape.

Furthermore, if the pinch roller is moved away from the capstan to the same position as when it is stopped, a mechanical impact sound will be generated as the pinch roller hits the capstan every time the tape running direction is reversed.

The present invention eliminates the above drawbacks.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In the figure, reference numeral 1 denotes a pinch roller, which presses a magnetic tape (not shown) against a capstan 2, thereby causing the tape to travel at a constant speed.

3 a t 3 b are shift pins that, in the illustrated stopped state, separate the tape from the magnetic head (not shown);
When the tape runs at a constant speed, the pin 3a is moved in the direction of arrow A.

3b is separated from the tape and the tape is brought into contact with the head in a known manner.

A board (not shown) using the pinch rollers 1 and 4 as fulcrums.
The arm 5 is rotatably attached to the arm 5, which is rotatably attached to the arm 5.

A movable member 6 is rotatably attached to the substrate with 7 as a fulcrum, and its end can be pulled by a relatively large first electromagnetic plunger 8.

Reference numeral 9 denotes a plate body rotatably attached to the movable member 6 about a pin 16, and includes forked raised parts 10a and 10b;
It has a narrow portion 11.

12 is a plate whose one end is attached to the arm 5 with 13 as a fulcrum, and the raised part 14 a + 14 of the plate
The narrow portion 11 of the plate 9 is slidably inserted into the hole b.

15 is a pin 16 implanted in the member 6 and the rising part 1;
4b.

Reference numeral 17 denotes a sliding plate on which the shift pins 3a+3b are embedded, and is slidably attached to the substrate and has an end portion of 1.
It is rotatably connected to the movable member 6 with 8 as a fulcrum.

Reference numeral 19 denotes a relatively small second electromagnetic plunger, and an actuation plate 21 is attached to its actuation rod 20, and the actuation plate is attached to the upright portion 10a.

The elongated hole 22 passes between the holes 10b and is fitted into the pin 16.

23 is a push plate, which has a hole through which the actuation plate 21 is inserted, and a coiled pressure spring 24 wound around the actuation plate.
Accordingly, the rising parts 10a, 10 are moved against the operating rod 20.
b is pressed.

The plunger 8 is excited by a playback/recording operation that causes the tape to run at a constant speed, and when its operating rod is pulled by the excitation, the movable member 6 is rotated counterclockwise, and this rotation causes the sliding plate to be rotated. The pins 3a and 3b implanted in the pins 17 are moved in the direction of the arrow A, and the arm 5 is further rotated (against the spring 25) via the spring 15 and the plate 12.

This rotation of the arm 5 causes the pinch roller 1 to be elastically pressed against the capstan 2 (through the tape), and the pin 3
a.

By moving pin 3b in the direction of arrow A, pins 3a and 3b are separated from the tape, and the tape is pressed against the head.

In this state, the tape is running at a constant speed.

When the tape is running at a constant speed, the plunger 19 as well as the plunger 8 are in an excited state.

In the above-mentioned constant speed running state, even if the plunger 19 is in the temporary de-energized state, the operating rod 20 moves in the retracting direction of the plunger 19 via the spring 24, and this moving position exceeds the retracting end position of the plunger 19. The mounting position of the plunger 19 is selected so that the plunger 19 is located at a location where the plunger 19 is mounted.

Therefore, when both plungers 8 and 19 are energized, the traction force on the actuating plate 21 due to the energization of the plunger 19 is not transmitted to the movable member 6 at all, that is, the elongated hole 22
Neither end in the longitudinal direction is in contact with the pin 16.

When a temporary stop operation is performed while the tape is running at a constant speed, or during a transition period when the tape running direction is reversed, the plunger 8 becomes de-energized and the plunger 19 continues to be energized.

When the plunger 8 is de-energized, the movable member 6 tries to return to the stopped state shown in the figure via the arm 5, the plates 9 and 12, and the spring 15 by the spring 25, but the movement of the movable member 6 in this return direction is The pin 16 hits one end of the elongated hole 22 of the actuating plate 21 attached to the actuating rod 20 of the excited plunger 19 and is regulated, and as a result, the movable member 6 is locked in the regulated position. Ru.

In this locked state, the pinch roller 1 is slightly separated from the capstan 2, and the pins 3a and 3b are also moved in the opposite direction of arrow A, but this movement is caused by the pins 3a and 3b coming into contact with the tape. , is not a large enough movement to move the tape away from the head.

Since the plunger 19 is for holding the operating rod 20 in a predetermined position, it does not require a large force to pull the operating rod 20 connected to the movable member 6 etc.
Very small plungers can be used.

A relatively large first electromagnetic plunger 8 and a pin 1 on one side.
6 is implanted and moves against a spring when the first electromagnetic plunger 8 is excited; and the movable member 6 is implanted with shift pins 3a and 3b for regulating the position of the magnetic tape. A sliding plate 17 that is slid by the movement of
and a first plate body 9 which has forked raised parts 10a and 10b at one end and a narrow part 11 at the other end and is rotatably mounted around a pin 16 implanted in the movable member 6. One end has two vertically raised parts 14a and 14b provided with a hole through which the narrow part 11 of the first plate 9 is slidably inserted, and the other end has a pinch roller 1. A second plate body 12 that engages with the arm 5 that is rotatably held, a pin 16 implanted in the movable member 6, and one side 14b of the upright part of the second plate body 12. a traction spring 15, a relatively small second electromagnetic plunger 19, and two-pronged raised portions 10a and 10b of the first plate body 9 attached to the operating rod 20 of the second electromagnetic plunger 19. an actuating plate 2 whose elongated hole 22 is fitted into a pin 16 implanted in the movable member 6;
1 and a hole through which the actuating plate 21 is inserted.
The bifurcated upright portion 1 of the first plate body 9 is pressed against the operating rod 20 by a coiled pressure spring 24 wound around the
0a.

10b, the pinch roller 1 is elastically pressed against the capstan 2 by the movement of the movable member 6, and the shift pins 3a, 3b are moved to a position where the magnetic tape can contact the magnetic head. When the first electromagnetic plunger 8 is deenergized while the second electromagnetic plunger 19 is energized, the movable member 6 tries to return to its original position by the traction spring 15.
is locked by a second electromagnetic plunger 19, and the locked position is such that the pinch roller 1 is slightly separated from the capstan 2, and the magnetic tape cannot be separated from the magnetic head by the shift pins 3a and 3b. With this selection, it is possible to eliminate the drawbacks that occur when the tape is temporarily stopped and when the tape running direction is reversed.

Furthermore, since an extremely small plunger can be used as the second electromagnetic plunger, it is possible to reduce the cost and also to reduce the size and weight.

[Brief explanation of the drawing]

The figure is a schematic plan view showing one embodiment of the present invention. 1...Pinch roller, 2...Capstan, 3a. 3b... Shift pin, 5... Arm, 6... Movable member, 8... First electromagnetic plunger, 9... First plate, 10a, 10b... Bifurcated stand Upper part, 11...
・Narrow width portion, 12...Second plate body, 14a, 14b...
・Standing part, 15... Traction spring, 16... Pin, 17
...Sliding plate, 19...Second electromagnetic plunger, 20
... Operating rod, 21... Operating plate, 22... Long hole, 2
3... Pressing plate, 24... Coiled pressing spring.

Claims (1)

[Scope of utility model registration request] A relatively large first electromagnetic plunger, a movable member having a pin planted on one side and moving against a spring when the first electromagnetic plunger is excited, and a shift pin that regulates the position of the magnetic tape. a sliding plate which is implanted and slid by the movement of the movable member; and a sliding plate having a forked raised portion at one end and a narrow portion at the other end, and which rotates around a pin implanted in the movable member. It has a first plate body which is movably attached, and two vertically raised parts each having a hole at one end through which the narrow part of the first plate body is slidably inserted. The end is hung between a second plate body that engages with an arm that rotatably holds the pinch roller, a pin implanted in the movable member, and one of the upright parts of the second plate body. The elongated hole passes between the traction spring, a relatively small second electromagnetic plunger, and the forked raised portion of the first plate attached to the operating rod of the second electromagnetic plunger. The actuation plate fitted to the pin implanted in the movable member and the insertion of the actuation plate, lJ! a push plate having a hole formed in the first plate and pressed against the fork-shaped raised portion of the first plate with respect to the actuating rod by a coiled press spring wound around the actuating plate; The pinch roller is elastically pressed against the capstan by the movement of the movable member, and the shift pin is moved to a position where the magnetic tape can come into contact with the magnetic head, and the second electromagnetic plunger is energized. When the first electromagnetic plunger is deenergized in this state, the movable member that is about to return to its original state by the traction spring is locked by the second electromagnetic plunger, and the locked position is such that the pinch roller is not removed from the capstan. 1. A tape drive device for a tape recorder, characterized in that the magnetic tape is located at a position where the magnetic tape is separated from the magnetic head by the shift pin, and the magnetic tape cannot be separated from the magnetic head by the shift pin.