JPS6319650Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a drive switching device, and more specifically, to an improvement of a rotary drive switching mechanism for a reel stand or the like suitable for use in a tape recorder or the like.

Conventionally, in tape recorders and the like, a rotary drive switching mechanism is well known which is located between the take-up and supply side reel stands and swings depending on the rotational direction of the motor to selectively engage an idler with the reel stand. , and its configuration is the first
As shown in Fig. and Fig. 2.

In each figure, two reel stands 2 and 3 are arranged on a chassis 1, and a rotational drive motor M is arranged approximately in the middle thereof.

Looking at the switching gear mechanism arranged on the motor M, an idler gear 4 is rotatably attached to one end of a rotating arm 5 using a mounting pin 6, and a flange 6a at the upper end of the mounting pin 6 and an idler gear A coil spring 7 is disposed between the rotating arm 5 and the addr gear 4, so that the rotating arm 5 and the addr gear 4 are frictionally connected. Also, the hole 5a at the other end of the rotating arm 5 is connected to the motor M.
The motor gear 9 is press-fitted into the motor shaft _M1 , which is rotatably loosely fitted into the bearing part 8 of the rotary arm 5 and protrudes from the rotary arm 5, so as to mesh with the idler gear 4. It is firmly attached.

Therefore, in FIG. 1, when the motor M rotates clockwise, the idler gear 4 rotates counterclockwise and the rotating arm 5 rotates clockwise.
When the idler gear 4 is meshed with the reel base 2 and rotated clockwise, and the motor M rotates counterclockwise, the idler gear 4 rotates clockwise and the rotating arm 5 rotates counterclockwise, causing the idler gear 4 to rotate clockwise. 4 is engaged with the reel stand 3 to rotate it counterclockwise.

However, in the above-mentioned conventional example, all drive switching mechanisms such as the rotary arm roller 5, idler gear 4, and motor gear 9 must be mounted on the rotating shaft of the motor before delivery, and the gears are attached to the expensive component of the motor. It is necessary to separately install parts such as 8, which increases management costs and is uneconomical.Also, when the gear or motor becomes defective, the motor gear 8
Since the gear is press-fitted into the motor shaft _M1 , it is very common to bend the motor shaft or damage the gear when removing the gear, resulting in extremely poor serviceability.

Also, for this reason, a method is used to tighten and fix gears to the motor shaft using screws, etc., instead of press-fitting them, but according to this method, there is enough space to insert the screwdriver and remove the screws. This method has the disadvantage of being disadvantageous in terms of space, and cannot be implemented in small equipment or equipment with a large number of parts.

This invention was made to eliminate all of the above-mentioned drawbacks, and the rotating arm, idler gear, etc. for switching and driving the idler gear by the rotation of the motor are made into a unit, and can be easily removed from the motor gear. A novel drive switching device is provided.

The present invention will be described in detail below with reference to an embodiment shown in FIGS. 3 to 5.

In each figure, the same reference numerals are used for the same parts as in the conventional example, and a motor gear 10 is disposed on the rotating shaft _M1 of the motor M with the rotating shaft protruding above.

Reference numeral 11 denotes a rotating arm, and a recess 11a is formed in the lower surface of the rotating arm 11. An idler gear 12 that meshes with the motor gear 10 is rotatably pivoted with a pin 16 in the recess 11a. The lower surface is positioned by a locking plate 13 attached to the lower surface of the rotating arm 11.

Further, a coil spring 14 is disposed between the idler gear 12 and the locking plate 13, and the elasticity of the spring 14 causes the idler gear 12 and the locking plate 13, that is, the rotating arm 11, to be frictionally connected.

On the other hand, on the rotary arm 11 on the left side of the idler gear 12 as seen in the figure, there is formed a bearing 11b into which the rotating shaft _M1 of the motor M is loosely fitted, as described later, and a locking plate 13 corresponding to the bearing 11b is formed. A hole 13a for receiving the motor gear 10 is also formed in the hole 13a.

Note that 11 formed at both ends of the rotating arm 11
C and 11d are a stopper for regulating the rotational position of the rotational arm 11, and a balancer for balancing the weight with respect to the rotational axis _M1 , which is the rotational axis of the rotational arm 11, respectively.

The drive switching mechanism assembly configured as described above is connected to the rotating shaft as shown by the arrow in Fig. 3.
When _M1 is inserted into the bearing 11b of the rotating arm ₁₁ , as shown in FIG. At the same time, the motor gear 10 and the idler gear 12 become in mesh with each other.

Then, attach the drive switching mechanism assembly to the rotating shaft.
After it is attached to _M1 , the upper part of the rotating arm 11 is prevented from coming off by using a part 15 such as a chassis or a cabinet, so that it will never come off during operation.

Therefore, as shown in FIG. 5, if the motor M rotates clockwise, the motor gear 10 also rotates clockwise and the idler gear 12 counterclockwise, or the idler gear 12 and the rotating arm 11 rotate as described above. Because of this frictional connection, the rotating arm 11 itself also rotates clockwise about the rotation axis _M1 , meshing the idler gear 12 with the reel stand 2, and causing it to rotate clockwise. Also, the stopper 11c at the tip of the rotating arm 11 is connected to the chassis 1.
By colliding with the pin 1a provided above,
The rotation position of the rotation arm 11 is determined.

When the motor M rotates counterclockwise, the motor gear 10 also rotates counterclockwise, and the idler gear 12
However, due to the frictional coupling between the rotating arm 11 and the idler gear 12 described above, the rotating arm 11 itself also rotates counterclockwise, causing the idler gear 12 to mesh with the reel stand 3. It rotates counterclockwise. Further, this position is held by a stopper 11c of the rotating arm 11 and a pin 1b on the chassis 1.

As described above, according to the rotary drive switching device of the present invention, the drive switching mechanism, which has conventionally been a single unit including the motor, can be replaced with a drive switching mechanism assembly that can be later attached to the motor side and the motor shaft. The drive switching mechanism assembly is constructed independently and can be easily installed and removed by simply placing the drive switching mechanism assembly on the rotating shaft of the motor during assembly, so there is no possibility of defects in the rotating arm or idler gear during use. Even if a problem occurs, there is no need to replace each motor, and only the drive switching mechanism assembly can be removed from the motor's rotating shaft and replaced. Serviceability and reliability are extremely high, and assembly is easy, making parts management easier. It has many effects, such as being convenient.

[Brief explanation of the drawing]

1 and 2 are a plan view and a side sectional view showing a conventional rotary drive switching mechanism, and FIGS. 3 and 4 are a side sectional view and a side sectional view showing the configuration of an embodiment of the present invention, respectively. FIG. 5 is a plan view showing an embodiment of the present invention. Explanation of symbols, 1... Chassis, 2, 3... Reel stand, 10... Motor pulley, 11... Rotating arm, 12... Idler gear, M... Motor, M ₁
……Axis of rotation.

Claims (1)

[Scope of utility model registration request] The rotational force of the motor is transmitted to a supply side reel stand or a take-up side reel stand via an idler, and by switching the rotational direction of the motor, either the supply side or take-up side reel stand is driven via the idler. A rotary drive switching device for a tape recorder or the like configured as described above has a gear attached to a motor rotation shaft, a bearing that pivotally supports a free end of the motor rotation shaft on the gear side, and meshes with the gear to reduce the rotational force of the motor. and a drive switching mechanism assembly consisting of a rotating arm that pivots on an idler gear that transmits the signal to either the supply side reel stand or the take-up side reel stand depending on the rotational direction of the motor, and the drive switching mechanism assembly is connected to the motor rotating shaft. A rotary drive switching device for a tape recorder, etc., characterized in that it is configured to be detachable from a gear.