JP2527591Y2 - Motor support structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support structure for a motor serving as a drive source of a micro printer mounted on a calculator or the like.

[0002]

2. Description of the Related Art Generally, in a printer, when a motor is stopped in a locked state due to an overload or the like, a large torque is required to restart the motor. However, small printers such as micro printers that are widely used today use low-torque motors to reduce the cost and size of products. It was difficult to restart the motor.

Various proposals have been made in the past to avoid this locked state and enable restarting.
Seed in Japanese Patent Application Laid-Open No. 2-277675 shown in FIG. 3 as a seed.

[0004] The prior art shown in FIG. 3 is characterized by its gear mechanism, which is a motor 1 that rotates a motor shaft 2 in one direction to drive a printer.
A drive gear shaft 3 fixed to the motor shaft 2, a drive gear 4 pivotally mounted on the drive gear shaft 3 so as to be relatively rotatable by a fixed angle, and a cogging torque larger than the motor 1 and an average torque of the printer. A driving gear spring 5 which is set to a smaller elastic force and urges the driving gear shaft 3 against the driving gear 4 in the reverse rotation direction of the motor 1, and a driving gear shaft 3 which transmits a driving force when the motor 1 is driven. Drive projection 3a provided on
And a driving force receiving portion 4a provided on the driving gear 4 in contact with the driving projection 3a, and the driving gear 4 and the driving gear shaft 3 are rotated by a fixed angle by the elastic force of the driving gear spring 5 when the motor 1 is stopped. Drive gear shaft 3 to lock in the locked position
The motor 1 itself is fixed to a frame (not shown) of the printer.

Next, the operation will be described. During the printing process of the printer, when a maximum load acts on the motor 1 for some reason and the drive signal to the motor 1 is cut off, the drive gear shaft 3 and the motor The shaft 2 rotates in the direction A opposite to the driving rotation direction B of the motor 1 until the shaft locking portion 3b and the gear locking portion 4b abut. After that, when the power is turned on again and the voltage is applied, the motor shaft 2 and the drive gear shaft 3 start to rotate vigorously, and the driving projection 3a and the driving force receiving portion 4a collide with each other. The starting torque of 1 acts as a force at the time of restart.

[0006]

However, in the conventional configuration, it is necessary to divide the driving gear shaft 3 and the driving gear 4 into two parts, which increases the number of parts. In particular, in the micro printer market, as described above, the cost is a priority, and the cost is not desirable even though it is to improve the performance.

Usually, the drive gear shaft 3 and the drive gear 4 are formed of plastic such as polyacetal, but damage may occur due to collision between the two.
There was a problem with durability.

The present invention overcomes the above-mentioned problems of the prior art, and can restart with a motor having a starting torque smaller than the maximum load of the printer even if the printer is stopped in a process with a large load during operation of the printer. In this way, low power consumption driving, low noise, small size,
It is an object of the present invention to provide a motor support structure with excellent durability that can realize low cost.

[0009]

According to the present invention, there is provided a motor support structure in which a motor body is supported by a motor support so as to be rotatable at a fixed angle about a motor shaft, and the motor body is driven in a rotational direction of the motor shaft. An elastic member for urging the rotating member is provided.

[0010]

According to the motor support structure of the present invention, if the power is shut off during the maximum load process for any reason during the printing process or the paper feeding of the printer and the power is turned off, the motor body is moved by the elastic member. Is rotated to the side opposite to the position shifted during the driving operation. Then, when the power is turned on again and a voltage within the specified specification voltage range is applied to the motor, the motor shaft is in a locked state and cannot be rotated at first, but the motor itself is in a range within which the motor itself can relatively rotate. , And the motor body and the motor support body collide with this momentum. Then, the superimposed force of the collision energy and the starting torque of the motor becomes a force at the time of restarting, and the printer can be started with a starting torque smaller than the maximum load of the printer.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings.

FIGS. 1 and 2 show an entire embodiment of a support structure for a motor of a printer according to the present invention. In this embodiment, a motor 1 has a motor body 1a with its motor shaft 2 as a center. Are supported by the frame body 6 so as to be rotatable by a certain angle α.

That is, an arc-shaped outer peripheral portion 1b is formed in the motor main body 1a of the motor 1, and this arc-shaped outer peripheral portion 1b is centered on the motor shaft 2 by a bearing arc recess 11 formed in the frame body 6. It is supported rotatably.

The frame body 6 includes an inclined surface 6a which serves as a stopper and a vertical end surface 6b which comes into contact with the planar outer surface of the motor body 1a in order to regulate the rotation angle α of the motor body 1a. Is formed. In the lower part of the end face 6b, there is formed a space 10 which is continuous with the bearing circular arc recess 11 and serves as a clearance allowing the rotation of the motor body 1a. A torsion coil spring 7 as an elastic member for urging the motor main body 1a of the motor 1 in the same direction as the driving rotation direction A of the motor shaft 2 is provided at the axial center of the motor main body 1a on the end face 6b side of the frame body 6. It is arranged in the part. The torsion coil spring 7 has a coil portion supported by the frame body 6 with the shaft 8, and one fixed end portion 7 b extending outward from the coil portion is fixed to the frame body 6 by the fixture 9. The other urging end portion 7a extending toward the motor body 1a is in contact with the outer surface of the motor body 1a. A small value of the elastic force of the torsion coil spring 7 is sufficient.

Next, the operation of this embodiment having the above-described configuration will be described.

During a normal printing operation of the printer, the motor 1 receives a drive signal and drives and rotates its motor shaft 2 in the direction of arrow A in FIG. The rotation of the motor shaft 2 is transmitted via the drive gear 12 to a predetermined position required for printing. During the driving of the motor 1, the motor body 1a receives a force in the direction of arrow B in FIG. 2 due to the reaction force of the rotation of the motor shaft 2, and resists the urging force of the torsion coil spring 7 in the solid line in FIG. To the position shown in FIG.
Abuts against the end face 6b of the camera.

However, an overload during the operation of the printer,
When the motor 1 is stopped due to a voltage drop or the like, the motor body 1a is rotated in the direction of arrow C in the drawing by the biasing end 7a of the torsion coil spring 7, and the outer surface abuts on the inclined surface 6a of the frame body 6. And stop. At this time, the lower right end of the motor body 1a in FIG.
Enter within 0.

Thereafter, when the power is turned on again and a predetermined electric power is applied to the motor 1 by a return operation, when the motor shaft 2 tries to rotate in the direction A in FIG.
The motor body 1a starts to rotate vigorously under almost no load condition against the small elastic force of the torsion coil spring 7 by the reaction force, and rotates by a certain angle α to form a motor support. It collides with the end face 6b of the frame body 6.
Then, the collision energy and the starting torque of the motor 1 are integrated to act as a restarting force, so that the motor shaft 2 starts rotating and continues rotating thereafter.

Therefore, when restarting the printer stopped in a process with a large load, the motor 1 can be restarted with a starting torque smaller than the maximum load of the printer, so that the motor 1 can be driven with low power consumption and small in size. And cost reduction. Further, the motor body 1a is made of metal, and no damage is caused by collision with the end face 6b of the frame body 6.

The present invention is not limited to the above embodiment, but can be modified as needed.

[0021]

As described above, according to the present invention, a range in which the motor main body can rotate by a fixed angle around the motor shaft is provided, and the motor main body is rotated within the rotation range by the driving rotation direction of the motor shaft. The motor shaft and the drive gear can be integrated with each other by providing an elastic member for urging the motor, and the motor can be restarted with a torque smaller than the load by a simple configuration with a small number of parts. Power consumption driving can be realized, and the cost can be kept low. Further, unlike conventional cases, damage due to collision between the drive gear shaft and the drive gear is eliminated, and the durability is excellent.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a motor support structure of a printer according to the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a plan view showing the structure of a motor of a conventional printer.

[Explanation of symbols]

 Reference Signs List 1 motor 1a motor main body 1b arc-shaped outer peripheral portion 2 motor shaft 6 frame body (motor bearing body) 6a inclined surface 6b end surface 7 torsion coil spring 7a biasing end 7b fixed end 11 bearing arc recess 12 drive gear

Claims (1)

(57) [Scope of request for utility model registration] 1. An elastic member for supporting a motor main body by a motor support so as to be rotatable at a fixed angle about a motor shaft, and for urging the motor main body to rotate in a driving rotation direction of the motor shaft. A motor supporting structure.