JP2545825Y2 - Head position switching device for tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a head position switching device for a tape recorder.

[Problems to be Solved by Conventional Techniques and Inventions] Conventionally, the moving amount of the head is constant, and the tape is always in contact with the head. For this reason, there was a problem of wear of the head and wear of the tape.

The purpose of the present invention was made in view of the above-mentioned problems,
An object of the present invention is to provide a tape recorder head position switching device capable of minimizing head wear and tape wear.

[Means for Solving the Problems] In order to achieve the above object, a head position switching device of a tape recorder according to the present invention is connected to a pulley that is rotationally driven by a motor via a friction mechanism, and An arm that normally rotates integrally with the pulley and generates a slip with the pulley when a certain load or more is applied, a first gear integrally provided with the pulley, and an arm that stands on the arm. A second gear rotatably supported on a shaft and constantly meshing with the first gear; and a third gear disposed on both sides of the second gear and having a larger diameter than the second gear.
A fourth gear, a head base movably configured and having a head and provided with a stopper at a predetermined position, and a solenoid for moving the head base; the second gear, the third gear; The gear and the fourth gear are arranged such that when the second gear rotates by a predetermined amount together with the arm toward the third gear or the fourth gear, the second gear rotates with the third gear. Alternatively, the arm and the stopper are arranged at a position meshing with the fourth gear, and the arm and the stopper cause the solenoid to perform a suction operation when the second gear meshes with the third gear. When the base is moved, the stopper comes into contact with the distal end of the arm, and when the second gear is meshed with the fourth gear, the solenoid is sucked to move the head base. Then, the stopper is provided so as not to contact the tip of the arm.

[Action]

According to the present invention, when the pulley is rotated by driving the motor, the arm rotates together with the second gear toward the third gear or the fourth gear according to the rotation direction. When the arm rotates a predetermined amount to the third gear side or the fourth gear side, the second gear meshes with the third gear or the fourth gear to restrict the movement of the arm. Here, when the second gear is engaged with the third gear and the head base moves by performing the suction operation of the solenoid, the stopper comes into contact with the tip of the arm and the head base is moved. Restrict movement.
On the other hand, when the second gear is engaged with the fourth gear and the head base is moved by suctioning the solenoid, the stopper does not come into contact with the distal end of the arm. . Therefore, the amount of movement of the head base is increased, and the head base can be controlled to a general constant-speed feed state.

[Embodiment] Hereinafter, the present invention will be described in detail with reference to an embodiment shown in the drawings.

FIG. 1 is a schematic plan view showing one embodiment of a head position switching device of a tape recorder according to the present invention. Pulley 1
Is connected to a drive shaft 2a of the motor 2 via a belt 3, and is controlled by the rotation direction of the motor 2. Further, a first gear 4 is fixed to the shaft 1a of the pulley 1, so that the pulley 1 and the first gear 4 can rotate integrally. The first gear 4 is constantly meshed with a second gear 5 having a larger diameter than the first gear 4.
The second gear 5 is rotatably supported by a shaft 7 erected at a substantially middle position in the longitudinal direction of the arm 6. The arm 6 is pivotally supported on the shaft 1a of the pulley 1.
And a frictional mechanism. Therefore, the arm 6 always rotates integrally with the pulley 1, but when a certain load or more is applied to the arm 6, the arm 6 slips with the pulley 1 and only the pulley 1 can rotate. It has become. Also, the first gear 4, the second gear 5, and the arm 6 are such that the first gear 4 is a sun gear,
The second gear 5 constitutes a planetary gear, and the arm 6 constitutes a planetary gear mechanism serving as an arm connecting the sun gear and the planetary gear. When the first gear 4 which is the sun gear rotates, the second gear which is the planetary gear is formed. Gear 5 revolves around the first gear 4 and rotates at the same time.

Further, third and fourth gears 8 and 9 having a larger diameter than the second gear 5 are disposed on both left and right sides of the second gear 5, respectively. The second gear 5 and the third and fourth gears 8 and 9 are not meshed with each other when the fourth gears 8 and 9 are in the middle position, but the second gear 5 is moved together with the arm 6 in the left or right direction. When it is rotated by a predetermined amount, it can mesh with the third gear 8 or the fourth gear 9. In this meshing state, the movement of the arm 6 in the left or right direction is restricted, so that only the pulley 1 rotates independently thereafter.

A head base 11 having a head 10 is a solenoid.
A stopper 14 is provided at a predetermined position of the head base 11 so as to be able to come into contact with the tip 6a of the arm 6 at a predetermined position.

Now, in a state where the arm 6 swings in the direction of the arrow A,
When the solenoid 12 is operated by suction, the solenoid lever 13
The head base 11 is operated in the direction of arrow C via
At this time, since the distal end 6a of the arm 6 is located at a position facing the stopper 14 of the head base 11, the stopper 14 comes into contact with the distal end 6a of the arm 6 so that the head base
11 is further restricted from moving, and the amount of movement is controlled to be small.

On the other hand, when the arm 6 swings in the direction of arrow B, the distal end 6a of the arm 6 is not at a position facing the stopper 14 of the head base 11, so that even when the solenoid 12 is suctioned, the stopper 14 The moving amount becomes large without contacting the front end portion 6a, and it can be controlled to a general constant speed feeding state.

As described above, in this embodiment, the position of the head 10 can be easily and reliably controlled, and the tape is always
Since the contact with the head 10 can be prevented, the problem of abrasion of the head 10 and abrasion of the tape can be solved.

[Effects of the Invention] As described above, according to the head position switching device of the tape recorder according to the present invention, when the pulley rotates by driving the motor, the arm and the second gear cooperate with each other in accordance with the direction of rotation. When the arm rotates to the third gear side or the fourth gear side and the arm rotates a predetermined amount to the third gear side or the fourth gear side, the second gear rotates to the third gear side. When the movement of the arm is restricted by meshing with a gear or a fourth gear, and when the second gear is meshed with the third gear, the solenoid is operated by suction to move the head base. The stopper abuts on the tip of the arm to regulate the movement of the head base,
When the second gear is engaged with the fourth gear and the head base is moved by performing the suction operation of the solenoid, the stopper does not contact the tip of the arm. The head base, a position where the solenoid is not suctioned, a position where the solenoid is suctioned and the stopper is in contact with the tip of the arm, and a position where the stopper is not in contact with the tip of the arm. Can be moved to the position, the position of the head can be controlled easily and reliably, and the tape can be prevented from constantly contacting the head as in the past,
It has an excellent effect of reducing head wear and tape wear as much as possible.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing one embodiment of a head position switching device of a tape recorder according to the present invention. DESCRIPTION OF SYMBOLS 1 ... Pulley 2 ... Motor 3 ... Belt 4 ... 1st gear 5 ... 2nd gear 6 ... Arm 6a ... Tip part 7 ... Shaft 10 ... Head 11 ... Head base 12 ... … Solenoid 14 …… Stopper

Claims (1)

(57) [Scope of request for utility model registration] 1. A pulley that is rotationally driven by a motor, and is connected to the pulley via a friction mechanism and always rotates integrally with the pulley, and when a load of a certain degree or more is applied, slippage occurs between the pulley and the pulley. An arm that is generated; a first gear that is provided integrally with the pulley; and a second gear that is rotatably supported by a shaft provided on the arm and is always meshed with the first gear. Third and fourth gears arranged on both sides of the second gear and having a larger diameter than the second gear; and a head having a movable head and having a stopper at a predetermined position. A base, and a solenoid for moving the head base, wherein the second gear, the third gear, and the fourth gear are configured such that the second gear and the arm together with the third gear side or the third gear Prescribed on the fourth gear side The second gear is disposed at a position where the second gear meshes with the third gear or the fourth gear when the second gear is rotated by an amount, and the arm and the stopper are arranged such that the second gear is the third gear. When the solenoid is sucked and the head base is moved while meshing with the gear, the stopper comes into contact with the tip of the arm, and the second gear meshes with the fourth gear. The head position switching device for a tape recorder, wherein the stopper is arranged so that the stopper does not come into contact with the tip of the arm when the head base is moved by suction operation of the solenoid.