JPH0425625B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a power cam drive mechanism for a tape recorder. In particular, by improving the gear configuration, forward and reverse rotation of the motor by loading eject, etc. Regardless of the situation, the power cam always rotates in the forward direction.

[Technical background of the invention] In recent years, automation of tape recorders has progressed, and by using the attraction force of an electromagnetic plunger and the driving force of a motor to hold and switch each mode, manual operation force is not required. Tape recorders have been put into practical use that allow switching of each motor with an extremely simple operation of simply pressing a switch.

In such an automated tape recorder, it is necessary to translate each actuating member to a fixed position, and therefore the rotational force of the motor must be converted into linear movement, but conventional conversion methods for this purpose are required. A power cam is used as the means. This power cam is rotated by a motor via a drive system consisting of multiple gears.
It operates only when rotated in the forward direction and pulls the rollers of the power plate, thereby causing the power plate to reciprocate and moving each member interlocking with the power plate in parallel.

Also, this power plate is biased in the return direction by a spring, and when the power cam operates, it moves forward against the biasing force of the return spring, and when it exceeds the maximum diameter of the power cam, the return spring is biased. It seems that the force is making a comeback.

Therefore, the operating part of the power cam is long and loose so that it can gradually pull the power plate with sufficient power, depending on the load of each member and the configuration of the power plate that moves against the force of the return spring. It is a spiral inclined surface, and as a result, the return portion is formed as a short and steeply inclined surface.

[Problems with the Background Art] Incidentally, in such an automated tape recorder, it is necessary to reverse the drive system in order to move each operating member in opposite directions during loading and ejecting. A switching mechanism was installed in the middle of the drive system, but this configuration complicates the mechanism, so recently a configuration that omit the switching mechanism by using a motor that can rotate in forward and reverse directions has been adopted. It's getting old. However, this configuration has the following drawbacks because the drive system is reversed during loading and ejecting.

That is, when a forward/reverse motor is used, the power cam is normally locked in a position separated from the drive system by a locking means such as an electromagnetic plunger when the drive system reverses, but when the motor reverses, the power cam is locked in a position separated from the drive system. is cut and the power cam engages with the drive system,
If the power is turned on again, or if the power cam is unlocked due to external force such as vibration when the motor is rotating in reverse, the power cam will rotate in the opposite direction, and as a result, the roller of the power plate will move against the sharply inclined surface of the power cam. This has the disadvantage that the power cam cannot be exceeded and the power cam becomes locked.

[Object of the Invention] The present invention was proposed in order to eliminate the drawbacks of the prior art as described above, and its purpose is to reverse the power cam when the drive system is reversed for purposes such as loading eject. To provide a power cam drive mechanism for a tape recorder which eliminates locking of the power cam by enabling a configuration in which the power cam is not locked.

[Summary of the Invention] A power cam drive mechanism for a tape recorder according to the present invention includes a gear that swings depending on the rotation direction on the motor side, and two meshing gears on the cam side. By configuring it so that it meshes with one of the gears on the side, and when it swings in reverse, it meshes with the gear on the opposite side, the gear mesh is switched when the drive system is reversed. The rotation of the power cam is maintained in the same direction as before the reverse rotation, and the power cam can always be rotated in the forward direction.

[Embodiment of the Invention] An embodiment of the power cam drive mechanism for a tape recorder according to the present invention as described above will be specifically described with reference to the drawings.

As shown in FIGS. 1 and 2, a power gear 3 is meshed with a pulley gear 2 that is interlocked with a motor 1. A cam gear 5 having a power cam 4 is provided in the opposite direction to the motor 1, and a small gear 6 is meshed with the cam gear 5. The power cam 4 is formed with a long, gentle spiral slope that operates by rotating clockwise, and a steep slope that continues from the maximum diameter portion to the small diameter portion.

Further, between the power gear 3 and the small gear 6, forward and reverse gears 7F and 7R for driving the forward and reverse reel bases are arranged side by side on the motor side and the cam side. Both gears 7F and 7R are always in mesh, and gear 7 on the opposite side
R meshes with the small gear 6.

Further, a power idler gear 8 is provided between the power gear 3 and the forward/reverse gears 7F and 7R, and is meshed with the power gear 3 to swing the switching gear 9 according to the rotation direction thereof. Further, the switching gear 9 swings in accordance with the rotation direction of the power idler gear 8, and when the power idler gear 8 is rotating clockwise in the figure, it swings in the same direction and rotates in the opposite direction. When the power idler gear 8 is rotating counterclockwise in the figure, it swings in the same direction and meshes with the positive gear 7F.

The power cam 4 is configured to pull the power plate and cause it to reciprocate by operating a roller 10 of the power plate (not shown).

Based on the above configuration, the power cam drive mechanism of the present invention operates as follows.

That is, first, when the motor 1 rotates in the forward direction, that is, when the motor 1
When the motor rotates clockwise, the pulley gear 2 interlocked with the motor 1 rotates clockwise, and the power gear 3 meshing with the pulley gear 2 rotates counterclockwise, as shown in FIG. Therefore, power gear 3
The power idler gear 8 meshing with the power idler gear 8 rotates clockwise.
The switching gear 9 attached to the gear 9 swings clockwise and meshes with the gear 7R on the opposite side. At this time, since the switching gear 9 rotates counterclockwise, the gear 7R on the opposite side
rotates clockwise, and the positive gear 7F meshing with gear 7R rotates counterclockwise. Therefore, the cam gear 5 meshing with the opposite gear 7R via the small gear 6 rotates clockwise, that is, in the operating direction of the power cam 4.

When the motor 1 is reversed from this state for the purpose of loading eject, etc., the pulley gear 2 rotates counterclockwise and the power gear 3 rotates clockwise, as shown in FIG. Therefore, with the reverse rotation of the power gear 3, the power idler gear 8 meshing with the power gear 3 rotates counterclockwise, and as a result, the switching gear 9 swings counterclockwise and shifts to the positive gear 7F. mesh. At this time, since the switching gear 9 rotates clockwise, the gear 7F on the positive side rotates counterclockwise, and the gear 7R on the opposite side rotates clockwise. Therefore, the cam gear 5 rotates clockwise via the small gear 6, that is, in the operating direction of the power cam 4, in the same way as before the motor 1 is reversed.

In this manner, in this embodiment, the rotational direction of the cam gear 5 does not change before and after the drive system is reversed, and the cam gear 5 always rotates in the operating direction of the power cam 4. Therefore, as in the past, when motor 1 reverses, the power is cut off and power cam 4 is turned off.
After the power cam 4 is engaged with the drive system, there is no risk of inconveniences such as the power cam 4 being locked by the rollers of the power plate when the power is turned on again.

[Effects of the Invention] As explained above, according to the present invention, by using a switching gear and configuring the gear engagement to be changeable in the middle of the drive system, the power cam can be changed before and after the reverse rotation of the drive system. As a result, it is possible to provide a high-performance power cam drive mechanism for a tape recorder that does not cause problems such as locking of the power cam.

[Brief explanation of drawings]

1 and 2 are plan views showing an embodiment of the power cam drive mechanism according to the present invention, respectively, with FIG. 1 showing the motor rotating in the normal direction and FIG. 2 showing the motor rotating in the reverse direction. 1...Motor, 2...Pulley gear, 3...Power gear, 4...Power cam, 5...Cam gear,
6... Small gear, 7F... Positive gear, 7R... Reverse gear, 8... Power idler gear, 9... Switching gear, 10... Power plate roller.

Claims (1)

[Scope of Claims] 1. A power cam drive mechanism for a tape recorder in which a motor drives a power cam that drives each operating member by forward rotation, and the motor is reversed for the purpose of loading eject, etc., comprising: A switching gear that swings according to the rotation speed is provided on the motor side, and two gears that mesh with each other are provided on the cam side. When the motor rotates forward, the switching gear on the motor side swings depending on which of the two gears on the cam side. A power cam drive mechanism for a tape recorder, characterized in that the power cam drive mechanism of a tape recorder is configured such that it is meshed with one gear and is meshed with the other gear when the motor swings in reverse rotation.