JPH0348736Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a head base moving device provided in a logic control type tape recorder.

BACKGROUND OF THE INVENTION This type of head base moving device is designed to move a head base equipped with a recording/reproducing head to a play position or a stop position by rotating a motor forward or backward. Specifically, the motor is provided with a worm, this worm is connected to a power assist gear via a transmission gear, a pressing part is formed in this power assist gear, and a pressed part pressed by this pressing part is connected to a head base. It is provided. When the motor rotates forward, the power assist gear is rotated forward by the worm via the transmission gear, and the pressing portion presses the pressed portion, thereby moving the head base to the play position.

In this state, the motor is stopped, the power assist gear is also stopped due to the engagement between the worm and the transmission gear, and the head base is locked at the play position. On the other hand, to move the head base to the stop position, the motor is rotated in the opposite direction. Then, the power assist gear is reversely rotated via the transmission gear, the pressing state of the pressed part by the pressing part is released, and the head base is returned to the stop position by the biasing force of the second spring.

However, with such conventional head base moving devices, if a power outage occurs while the tape recorder is in play mode and power is not supplied to the motor, the motor cannot be rotated in the reverse direction and the head base cannot be moved to the stop position. There is a problem that the cassette cannot be returned and the cassette cannot be removed.

Purpose of the invention This invention was made by focusing on the problems of the conventional printers, and even when power is not supplied to the motor due to a power outage, etc., the head base can be returned to the stop position and the cassette can be removed. The object of the present invention is to provide a head base moving device that can move the head base.

Structure of the Invention To achieve the above object, the head base moving device of the invention includes a motor having a worm fixed to a motor bracket, the motor bracket and the transmission gear being attached to a chassis, and the motor bracket having one end side. The worm is attached so as to be rotatable about the center and is biased toward the chassis by a first spring, and when the motor bracket is rotated about one end side against the biasing force of the first spring, the worm and It is characterized by being set so that meshing with the transmission gear is released.

Example This invention will be explained below based on the drawings.

1 to 3 are views showing one embodiment of this invention, in which FIG. 1 is a plan view of the head base moving device, FIG. 2 is a left side view of FIG. 1, and FIG.
FIG. 3 is a right side view of the figure. .

First, the configuration will be described. Reference numeral 1 in the figure is a chassis, and various parts such as a motor 2 are attached to the chassis 1.

Specifically, the motor 2 is provided with a worm 3, and the motor 2 is attached to the chassis 1 by a motor bracket 4 (details will be described later). A worm wheel 6 of a transmission gear 5 is meshed with this worm 3. The transmission gear 5 includes this worm wheel 6 and a pinion 7 provided coaxially with the worm wheel 6.
and an intermediate gear 8 meshed with this pinion 7, and is disposed on the chassis 1. A large-diameter power assist gear 9 is meshed with this intermediate gear 8, and this power assist gear 9 has the following functions:
A pressing portion 10 is formed on the chassis 1 side. Further, on the opposite side of these parts such as the motor 2 and the chassis 1, a head base 11 is provided with a head so as to be moved between a play position and a stop position by a guide member (not shown). It is arranged to be able to slide freely in the vertical direction in the figure. In the figure, the upper side is the play position and the lower side is the stop position. A pressed portion 12 that is pressed by the pressing portion 10 of the power assist gear 9 is cut and raised in the head base 11, and this pressed portion 12 protrudes from the opening of the chassis 1 toward the power assist gear 9 side. ing. Further, the head base 11 is always urged toward the stop position, that is, downward in the figure, by the second spring 13.

On the other hand, the motor 2 mentioned briefly above is fixed to a mounting piece 4a of a motor bracket 4 with a set screw 14, and this motor bracket 4 is attached to the chassis 1. That is, the motor bracket 4 has a pair of bent pieces 4b formed on both sides of the upper end, and a pressing piece 4c bent in the same direction as the bent pieces 4b on the right side of the lower end in FIG. is formed. These bent pieces 4b and pressing pieces 4c
are inserted into holes 1a and 1b of chassis 1, respectively. The pressing piece 4c protrudes considerably from this hole 1b. Further, a boss 1c protruding from the chassis 1 is inserted into the hole 4d of the motor bracket 4, and a bracket screw 16 is screwed into the boss 1c with a washer 15 interposed, so that the washer 16 and the motor bracket are screwed together. A first spring 17 is interposed between the first spring 17 and the first spring 17.
The motor bracket 4 is pressed against the chassis 1 by the urging force. Such a motor bracket 4 rotates while compressing the first spring 17 around the bending piece 4b side (one end side) by pressing the pressing piece 4c in the direction of arrow A in FIG. , the worm 3 and the worm wheel 6 are disengaged from each other.

Next, the operation of the head base moving device having such a configuration will be explained. When the motor 2 rotates forward, the power assist gear 9 rotates in the direction of the arrow X in FIG. Press the pressing part 12 upward. The head base 11 is now moved to the play position, and in this state the drive of the motor 2 is stopped, and due to the engagement of the worm 3 and the worm wheel 6, the head base 11 is stopped at the play position, and the tape recorder enters the play state. Then, playback etc. will be performed.

On the other hand, when canceling the play state, the motor 2 is rotated in the reverse direction. Then, the power assist gear 9 is activated via the worm 3 and the transmission gear 5.
It is rotated in the direction of arrow Y in the figure, and the pressed state of the pressed part 12 by the pressing part 10 is released. The head base 11 is returned from the play position to the stop position by the second spring 13. This will release the play state and allow you to remove the cassette.

By the way, if power is not supplied to the motor 2 due to a power outage or the like while the head base 11 is in the play position, the following procedure is performed. That is, the pressing piece 4c of the motor bracket 4 is pushed in the direction of arrow A in FIG. The motor bracket 4 moves the first spring 1 in the direction of arrow B centering on the bent piece 4b side.
Rotate while compressing 7. As a result, the worm 3 provided on the motor 2 moves, and the transmission gear 5 disengages from the worm wheel 6. Then, the head base 11 returns to the stop position while rotating the power assist gear 9 and the transmission gear 5 due to the biasing force of the second spring 13. Therefore, even if electric power is not supplied to the motor 2, it is possible to take out the cassette. On the other hand, when the pressing force of the pressing piece 4c is released, the motor bracket 4 is rotated around the bent piece 4b side by the biasing force of the first spring 17, and is pressed against the chassis 1. Thereby, the worm 3 meshes with the worm wheel 6 of the transmission gear 5, and the rotation of the motor 2 can be normally transmitted to the transmission gear 5 and the like. In this case, since the worm 3 and the worm wheel 6 are to be engaged with each other, the worm 3 that has been removed
However, it can be smoothly engaged with the worm wheel 9.

Effects of the invention As explained above, according to this invention,
By making the motor bracket movable, even if power is not supplied to the motor due to a power outage, the head base can be returned to the stop position and the cassette can be taken out. Moreover, since the worm and the transmission gear are disengaged, by moving the worm, when the worm and the transmission gear are disengaged and then re-engaged, the worm and the transmission gear can be smoothly engaged. It is effective in that it can be done.

[Brief explanation of the drawing]

Each figure shows an embodiment of the head base moving device for a tape recorder of this invention. FIG. 1 is a plan view of the device, FIG. 2 is a left side view of FIG. 1, and FIG. 3 is a view similar to that of FIG. FIG. 1... Chassis, 2... Motor, 3... Worm, 4... Motor bracket, 5... Transmission gear,
9... Power assist gear, 10... Pressing part, 1
1...Head base, 12...Pressed part, 13...
...Second spring, 17...First spring.

Claims (1)

[Claims for Utility Model Registration] When a motor having a worm rotates in the forward direction, the worm causes the transmission gear and the power assist gear to rotate in the forward direction, and the pressing portion of the power assist gear presses the pressed portion of the head base. The head base is moved to the play position and stopped at the play position, and on the other hand, the power assist gear is rotated in the opposite direction by the reverse rotation of the motor, and the pressing state of the pressed part by the pressing part is changed. In the head base moving device for a tape recorder, in which the head base is returned to the stop position by the biasing force of a second spring, the motor having the worm is fixed to a motor bracket, and the motor bracket and the transmission gear are attached to a chassis. , the motor bracket is attached to be rotatable about the one end side, is biased toward the chassis by a first spring, and rotates the motor bracket about the one end side against the biasing force of the first spring. 1. A head base moving device for a tape recorder, characterized in that the worm and the transmission gear are disengaged when the worm is rotated.