JPH021712Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a reciprocating device for a tape-shaped body that can be realized with an extremely simple configuration.

The present invention is particularly effective when used in reel-drive type tape recorders, etc. In devices that use a reel-to-reel type cassette in which the tape end is fixed to a reel hub, when the end of the tape is reached, the take-up reel is Utilizing the stoppage of the stand, the transmission of rotational force is automatically switched by the escape displacement of the idle gear that has been meshed in the escape direction, and the rotation direction of the drive motor etc. is changed using this displacement force to change the rotation direction of the drive gear. The rotation direction of the tape can be switched and the tape can be fed in the opposite direction, making it possible to drive the tape back and forth extremely easily without the need for a special end detection device.

An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 indicates a drive gear which is driven by a motor or the like and is rotated forward and backward by a shaft 2, 3 is an idle gear meshed with the drive gear 1, and 4 supports the idle gear 3 at one end so as to be rotatable by a shaft 4a. The support arm 4 is coaxial with the shaft 2 of the drive gear 1 and is rotatable.

5 is a left reel base gear, 6 is a reel shaft provided integrally with the left reel base gear 5, 7 is a right reel base gear, 8 is a reel shaft provided integrally with the right reel base gear 7, and the support The idle gear 3 is selectively engaged with the left reel stand gear 5 and the right reel stand gear 7 by the left and right rotation of the arm 4. In this case, the idle gear 3 is interposed between the drive gear 1 and the reel stand gears 5 and 7 in the escape direction.

Here, the presence of an idle gear in the escape direction means that the force in the circumferential direction that is applied to the idle gear from the outer periphery of the drive gear 1 that is the drive side, and the reel stand gear 5 that is the load side (in the case of Fig. 1) This means that the direction of the resultant force with the circumferential force received from the idle gear 3 is such that it acts on the idle gear 3 in the direction of disengaging the gears 1 and 5 that mesh with each other.
When the rotation direction is opposite to this, the idle gear 3 receives a force in a direction that strengthens the meshing, but the rotation direction between the gears at this time is said to be in the biting direction.

9 is a manual operation knob provided at the other end of the support arm 4, and 10 is interposed between the other end of the support arm 4 and the fixed part, and is used to move the idle gear 3 and the support arm 4 to two positions on the left and right. This is a spring for stable switching with click action.

Reference numeral 11 denotes an engagement hole provided in the support arm 4, and an operating piece 13 of a changeover switch 12 for switching the motor between forward and reverse directions or switching the recording/playback head.
is engaged.

With the above configuration, we now have support arm 4.
is in the rotational position as shown in the figure, and when the drive gear 1 is rotated clockwise and the tape is being wound by the reel shaft 6, the end of the tape has been reached and the left reel stand gear 5 is rotating. When the drive gear 1 is stopped, the drive gear 1 drives the idle gear 3 together with the support arm 4 to the right. When the idle gear 3 crosses the midpoint between the two reel shafts 6 and 8, it moves until it meshes with the right reel stand gear 7 due to the reverse biasing force of the spring 10, and at this time, due to the rotation of the support arm 4. The switch 12 is then turned, the motor is reversed, and the drive gear 1 is rotated counterclockwise.

Therefore, the right reel shaft 8 is rotated counterclockwise to wind the tape.

When the idle gear 3 is rotating the left reel stand gear 5 and the right reel stand gear 7, the idle gear 3 is rotating in the escape direction, so it is automatically reversed at the end of the tape to drive the tape back and forth. It is done. On the other hand, an operation knob 9 provided on the support arm 4 until the end of the tape is reached.
By operating , you can forcefully switch the tape drive direction manually.

Although the present embodiment has been described using a tape recorder as an example, the same applies to other tape-like object driving devices.

As described above, the present invention consists of a motor that rotates in the forward direction, a drive gear driven by this motor, two reel shafts that take up and supply tape-like material, and a motor that rotates integrally with each reel shaft. Two reel base gears, one idle gear that meshes with the drive gear and is supported by a support arm and selectively meshes with the two reel base gears, and a switch that switches the rotation direction of the motor,
The idle gear is interposed so as to run away from the drive gear when the reel base gear is being driven, and the switch is operated by displacement of the support arm, so that the reel base gear can be stopped. Therefore, the idle gear automatically detects the arrival of the end of the tape, reverses the rotational direction of the motor, and reciprocates the reel that winds the tape-like object, and can be used, for example, in a reel-driven tape recorder. It is something.

[Brief explanation of the drawing]

The drawing is a configuration diagram showing an embodiment of the present invention. 1... Drive gear, 2... Axis, 3... Idle gear, 5... Left reel stand gear, 6... Reel shaft, 7
...Right reel stand gear, 8...Reel shaft, 9...Operation knob, 12...Switch.

Claims (1)

[Scope of utility model registration request] A motor that rotates forward and backward, a drive gear driven by this motor, two reel shafts that wind and supply the tape-like object, and two reel stand gears that rotate integrally with each reel shaft. An idle gear that meshes with the drive gear, is supported by a support arm, and selectively meshes with the two reel stand gears, and a switch that switches the rotational direction of the motor, and the idle gear is connected to the reel stand gear. a tape-shaped body which is interposed so as to be in the escape direction relative to the drive gear when the switch is being driven; the switch is operated by displacement of a support arm; and the support arm is rotatably provided coaxially with the drive gear; reciprocating drive device.