JPS604299Y2 - Inclined pole position regulating device in VTR - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tilt pole position regulating device for a cassette VTR.

Generally, a cassette VTR is provided with an inclined tape guide pole for allowing the tape pulled out from the cassette to wrap around the peripheral surface of the head drum.

This pole is inserted into the loop of the tape that has been pulled out, so it can also be used as a tape guide for pulling out the tape,
Alternatively, it is usually provided near the tape guide and moved together with the tape guide when the tape is drawn out.

Incidentally, although the above-mentioned inclined (tape guide) pole is movable as described above, it must be sufficiently fixed during tape recording or reproduction.

If the tilted pole is not fixed completely during recording, the contact of the tape to the head drum may fluctuate, resulting in
Satisfactory recording/playback is not possible.

For this reason, generally, when the tilting pole moves to a predetermined position, the tilting pole is strongly pressed against a fixed contact portion.

Therefore, since this pressing requires a sufficiently large force, a drive mechanism dedicated to this pressing is conventionally provided, and when pressing the inclined pole as described above with the driving force for drawing out the tape, the driving mechanism described above is required. It was necessary to use a force that was too strong to pull out the tape.

The present invention does not use a dedicated drive mechanism for pushing as described above, nor does it use an excessively strong driving force for tape pull-out, but uses the normal drive force for tape pull-out to sufficiently move the inclined pole. The present invention provides a tilt pole position regulating device for a VTR that can be fixed, and as shown in the figure, a movable member 3 that is rotated by receiving a driving force for pulling out a tape 2 from a cassette 1. a first arm 5 rotatably provided on the rotating member with 4 as a fulcrum, and a second arm 7 rotatably provided on the first arm as 6 as a fulcrum; A tilted pole 8 provided on the second arm and a position regulating portion 9 formed from the base of the tilted pole; a contact portion 10 with which the position regulating portion 9 comes into contact during the process of pulling out the tape 2; By further rotating the rotating member 3 with the position regulating portion 9 in contact with the contact portion, the distance between the position regulating portion 9 and the pivot point 4 of the first arm 5 is reduced. The first arm 5 and the second arm 7 are rotated so as to become shorter,
The rotation causes a pressing portion of the first arm 5 or the second arm 7 to be provided in the vicinity of the pivot point 6 of the pivot point of the second arm 7, for example, a pin 11 implanted in the pivot point 6.
The receiving member is rotatable in the pressing direction by the pin 11, and furthermore, the receiving member is rotatable in the direction of the rotation from the fulcrum 12 to the part where the pin 11 is brought into contact. The third arm 14 is biased by a strong spring 13, and the spring 13, the position regulating part 9, the contact part 10, the second arm 7, and the third arm 14 constitute a toggle mechanism. This is a tilt pole position regulating device for a VTR.

An embodiment of the present invention will be described in detail below.

In FIG. 1, a cassette 1 is of the known type and has two reel hubs 15, 16, around which a magnetic tape 2 is wound.

This cassette 1 is shown installed in a VTR, and the inclined pole 8, the pinch roller 18, the auxiliary tape guide pole 1
9 has been inserted.

The pole 19 is implanted in the first arm 5, and the pinch roller 18 is rotatably attached to an arm 20 rotatably provided on the arm 5 with the pole 19 as a fulcrum.

The arm 20 is biased counterclockwise with respect to the arm 5 by a spring 21, and the arm 20 is pressed against a pin 22 implanted in the arm 5.

The arm 7 is biased clockwise with respect to the arm 5 by the spring 23, so that the arm 7 is pushed against the shaft 3 of the pinch roller 18.
is under pressure.

The arm 5 is urged counterclockwise by a spring 24,
A guide roller 25 rotatably provided on the arm 5 about the fulcrum 6 is pressed against the periphery of the guide plate 26.

The guide plate, tape guide pin 27, and contact portion 10 are fixed to a substrate (not shown).

28 is a well-known capstan, and the pinch roller 1
8 presses the tape 2.

Reference numeral 29 denotes an electromagnetic plunger, and the urging force of the plunger causes the sliding rod 31 to slide against the spring 30, and the arm 32 to rotate about the fulcrum 33 with respect to the front board.
The shaft 36 is pressed through a rotary piece 35 that is rotatable about the center point 4, and the pinch roller 18 is pressed against the capstan 28 by this pressure.

Reference numeral 37 denotes an arm rotatably provided on the substrate about a fulcrum 38, and the arm is urged by the spring 13 and pressed against a pin 39 implanted in the substrate.

The third arm 14 is attached to this arm 37 so as to be rotatable about the fulcrum 12, and the arm 14 is supported by a spring 40.
The arm 14 is urged counterclockwise by the arm 37
It is pressed against the rising part 41 of.

In a VTR having such a configuration, when the rotating member 3 is rotated counterclockwise from the state shown in FIG. 1 by a driving force for drawing out the tape from a motor (not shown), When the arm 5 is moved while the roller 25 is pressed against the guide plate 26 as shown in FIG. 2, and the rotating member 3 is further rotated to the state shown in FIG.
Touched by 0.

When the rotating member 3 is further rotated, the -arms 5 and 7 are rotated against the springs 23 and 24, respectively, since the position regulating part 9 is stopped by the abutting part 10 as shown in FIG. moved,
The pin 11 is brought into contact with the arm 14.

As the rotating member 3 further rotates, the arm 14 rotates against the spring 40 as shown in FIG. Accordingly, the arm 37 is rotated against the spring 13 and the pin 11 is rotated.
When exceeds the straight line, the drive of the rotating member 3 is cut off, and the pin 11 is moved away from the straight line by the bias of the spring 13, and the arm 7 also contacts the tape guide 27 (or The rotating member 3 comes into contact with a stopper or the like (not shown).

In the state shown in FIG. 5, when the plunger 29 is biased, the pinch roller 18 is pressed against the capstan 28 by the rotating piece 35 against the spring 21, and as is well known, the tape 2 is moved at a constant speed. It will be run.

In the above embodiment, the tape 2 is pulled out from the cassette 1 by the pole 19, but the tape is pulled out by two inclined poles and brought into contact with the head drum, and in this contact state, the tape forms an approximately M-shape. Even in the well-known VTR, by applying the present invention to the above-mentioned two inclined poles, the inclined poles can be firmly fixed by the tape pull-out driving force.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIGS. 1 to 6 are plan views showing the operating process, and FIG. 7 is a side view of the main parts. 1: Cassette, 2: Tape, 3: Rotating member, 5: First arm, 7: Second arm, 8: Inclined pole, 9: Position regulating section, 10: Contact section, 13: Spring, 14 : Third arm.

Claims (1)

[Scope of utility model registration request] a movable member to which a driving force for pulling out a tape from a cassette is transmitted and moved; a first arm rotatably provided on the movable member; and a movable member rotatably provided on the first arm. a second arm, an inclined pole and a position regulating section provided on the second arm, an abutting section with which the position regulating section abuts during the tape drawing process, and a positioning section on the corresponding abutting section. the first arm so that the distance between the position regulating section and the fulcrum of rotation of the first arm is shortened by further moving the movable member with the regulating section in contact with the movable member;
The arm and the second arm are rotated, and as a result of the rotation, a pressing portion provided in the vicinity of a rotational fulcrum of the second arm in the first arm or the second arm comes into contact with the pressing portion. a receiving member, the receiving member is rotatable in the pressing direction by the pressing part, and is rotated by a strong spring in the direction from the fulcrum of the rotation to the part abutted by the pressing part. A tilt pole position regulating device for a VTR, which has a biased third arm, and has a toggle mechanism constituted by the spring, a position regulating section, an abutting section, a second arm, and a third arm.