JPH07244134A - Inspecting apparatus for motor - Google Patents

Abstract

PURPOSE:To provide an inspecting apparatus for a motor assembly. CONSTITUTION:The inspecting apparatus for a motor comprises a shaft 17 which is engaged with a gear 15 of the motor 11 to be rotated, a rotary plate 21 fixed to the shaft 17, two mark means 23, 25 provided on the plate 21, two signal detecting means 27, 29 for detecting signals from the means 23, 25, and deciding means for determining is the motor 11 is good or not based on detected results of the means 27, 29.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inspection apparatus, and more particularly, to an apparatus for inspecting whether an assembled motor assembly is a good product or a defective product before being assembled into a predetermined product. More specifically,
The present invention relates to an inspection device that measures a rotation direction and a rotation torque of a final rotating body obtained by an assembly to determine whether the assembly has a normal rotation direction and a normal rotation torque.

[0002]

2. Description of the Related Art Up to now, in the case of a stepping motor assembly, particularly a motor used by being incorporated in a facsimile machine, an inspection before being incorporated has not been performed. Further, although a torque converter meter has conventionally been used as a rotating body inspection device, it has a drawback that it cannot be used for a low torque motor such as a stepping motor.

[0003]

SUMMARY OF THE INVENTION The present invention has been developed to solve the above-mentioned problems, and its purpose is to be used by being incorporated in a stepping motor assembly, particularly a facsimile machine. Another object of the present invention is to provide a motor inspection device for easily inspecting a motor before mounting.

[0004]

In order to achieve the above object, a motor inspection device according to the present invention comprises a shaft that engages with a rotating body of a motor to rotate, a rotary plate fixed to the shaft, and It comprises two mark means provided on the rotary plate, two signal detecting means for detecting a signal from the mark means, and a judging means for judging the quality of the motor based on the detection result of the detecting means. It is characterized by that.

[0005]

Therefore, according to the present invention, it is possible to easily determine whether or not the motor assembly is non-defective by the respective signals from the two signal detecting means. That is, the rotation direction of each detection pulse of the first and second signal detection means is known from the positional relationship that is ahead or behind in time, and if the positional relationship is opposite, the rotation direction is opposite. As a result, it can be seen that this motor assembly has incorrect wiring connections.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 schematically shows an example of a stepping motor assembly and shows a part of an inspection apparatus according to this embodiment. In the figure, 11 is a stepping motor (hereinafter referred to as a motor), and a gear block 13 is connected to the motor 11. Then, the gear block 13 includes a final transmission gear 15 that is a rotating body.
Is attached. The stepping motor assembly 10 is composed of these, and the final transmission gear 15 is the final rotating body of the stepping motor assembly 10.

Reference numeral 17 denotes a shaft which constitutes a part of the inspection device 41. The shaft 17 is provided with a pin 18 projecting from a head portion 17a fixed to the end portion of the shaft 17. The pin 18 is adapted to be engaged with and connected to the final transmission gear 15. Reference numeral 19 denotes a bearing that rotatably holds the shaft 17, and reference numeral 21 denotes a disc having a slit, which is fixed to the shaft 17.

Reference numerals 23 and 25 in FIG. 1 denote small mirrors serving as marking means, which are fixed near the outer circumference of the disc 21. Reference numeral 27 denotes a first reflection type sensor which is a first signal detecting means, and the first sensor 27 is the first mirror 2
The reflected light of 3 is received. Reference numeral 29 denotes a reflective second sensor which is a second signal detecting means, and this second sensor 29 is also configured to receive the reflected light of the second mirror 25. Reference numeral 31 is a transmissive photosensor that detects a slit 33 formed on the outer circumference of the disk 21.

Although the first and second sensors 27 and 29 are of the reflection type and detect the reflected light from the mirrors 23 and 25, respectively, it is also possible to detect magnetism or the like. Of course. Further, although the slit 33 is detected by the photo sensor 31, it goes without saying that light, magnetism or the like may be detected.

FIG. 2 is an explanatory view schematically showing the whole of the inspection device 41 according to this embodiment. In the figure, reference numeral 35 is a control device for the inspection device 41, which has a determination means for determining the quality of the stepping motor assembly 10 having the motor 11, and the control device 35 has a first sensor 27, a second sensor 29, The quality of the stepping motor assembly 10 is determined based on the signal from the photo sensor 31, and
The control device 35 is configured to output a control signal to the rotation speed switching circuit 37 of the motor 11. Then, the stepping motor control circuit 39, based on the output signal of the rotation speed switching circuit 37, outputs the stepping motor assembly 10
It is configured to control the rotation speed of the. Although not shown, the control device 35 has a microprocessor device and is configured to inspect the rotation direction and the rotation torque of the motor 11 via control software. In the inspection of the rotation direction, the rotation direction input data from the first sensor 27 and the second sensor 29 (step S1) is compared with the predetermined rotation direction data (steps S2 and S3). (Step S4), the number of slits of the disk 21 is read by the photo sensor 31 (Step S7), and further, the input from the photo sensor 31 and the set data of the predetermined rotational torque (Steps S5, S6) are compared. By doing so (step S8), it is determined whether the stepping motor assembly 10 is a non-defective product or a defective product. If it is a non-defective product, OK display (step S9) is performed, and if it is a defective product, an NG display ( The step S10) is performed.

Next, the quality judgment method of the present invention will be described with reference to FIG. First, the final transmission gear 15, which is the final rotating body of the stepping motor assembly 10,
As shown in FIG. 1, the pin 18 is connected to the shaft 17 of the inspection device 41. After this, the motor 11 is rotated. That is, when a regular pulse voltage is applied to the motor 11 via the stepping motor control circuit 39,
In the case of forward rotation indicated by the arrow 43 in (b), the sensor 2
7 and the state of input from the sensor 29 to the control device 35 is as shown in FIG.

That is, the rotation of the motor 11 starts,
If you check the input state after a certain period of time,
In the case of normal rotation, first, the input of the sensor 27 is detected by one pulse, and after t1, the input of the sensor 29 is detected by one pulse. Therefore, in this case, the sensors 27, 29
If the positional relationship of the input pulse from is reverse, it is found that the rotation is reverse, and the stepping motor assembly 10
Is found to be a defective product with incorrect connection of lead wires (steps S1 to S4).

Therefore, when the forward rotation of the motor 11 is constant, this state is repeated at a constant cycle as shown in FIG. 3 (a). In addition, the photo sensor data and
The preset set data A for inspection shown in (c),
B is compared (step S4) to check whether the motor 11 is rotating in the forward direction. Then, a product that substantially matches the set data is a good product, and a product that does not substantially match the set data is a defective product.

Similarly, the state of input from the sensors 27 and 29 when the stepping motor 11 is rotated in the reverse direction is shown in FIG.
(B) of. In this case, first, the input of the sensor 29 is detected by one pulse, and after t2, the input of the sensor 27 is detected by one pulse. Thereafter, the rotation direction of the motor 11 is inspected in the same manner as in the normal rotation (step S4).

As described above, if the motor 11 is a defective product, or if the gear block 13 has a defect such as a gear breakage, the rotation is not transmitted to the final transmission gear 15, so that the sensors 27 and 29 are used. Is O
Since the state of N or OFF is maintained, it becomes possible to detect a defect.

Next, regarding the measurement of the rotation torque of the stepping motor assembly 10, after detecting that the determination with respect to the rotation direction of the stepping motor assembly 10 is OK, the number of slits 33 of the disk 21 is determined by the photo sensor 31. And the number of detections of the slit 33 for a certain period of time is measured (step S7), and the rotation speed and torque data during normal rotation (steps S5, S) are detected.
The rotation torque is determined from the relationship with 6).

That is, the input data from the photo sensor 31 is compared with the set data at the time of normal rotation (step S8). When the input data is within the predetermined range with respect to the set data, the torque of the motor 11 is compared. Is determined to have a normal value, and accordingly, the torque of the motor 11 is determined to have a normal value, and accordingly, it is determined as a non-defective product (step S9). On the contrary, when the input data is not within the predetermined range with respect to the set data, it is determined that the torque of the motor 11 is not a normal value, and NG
The display is made (step S10).

As described above, the inspection device for a stepping motor according to the present invention is provided with the shaft that rotates by engaging with the rotating body of the stepping motor, the rotating plate fixed to the shaft, and the rotating plate. It is characterized by comprising two mark means, two signal detecting means for detecting a signal from the mark means, and a judging means for judging the quality of the stepping motor based on the detection result of the detecting means. Is. Although the stepping motor has been described as an example in the present embodiment, the present invention can be easily applied to a servo motor and a geared motor.

[0019]

As described above, according to the present invention, it is possible to easily inspect whether the assembled stepping motor assembly is a good product or a defective product before being used by being incorporated in a predetermined product. As a result, compared to the case where a defect is found after being incorporated into a product, it has the effect of significantly reducing the process and reducing the cost. It has the effect of improving.

[Brief description of drawings]

FIG. 1 schematically shows an example of a stepping motor assembly, (a) is an overall view, and (b) is a front view of a disc.

FIG. 2 is a block diagram schematically showing an entire inspection device according to the present embodiment.

FIG. 3 is a timing chart for explaining FIG.

[Explanation of symbols]

 10 Stepping Motor Assembly 11 Stepping Motor (Motor) 15 Final Transmission Gear 17 Shaft 21 Disc 23 First Mirror 25 Second Mirror 27 First Sensor 29 Second Sensor 31 Photo Sensor 33 Slit 35 Control Device

Claims (1)

[Claims] 1. A shaft rotating by engaging with a rotating body of a motor, a rotary plate fixed to the shaft, two mark means provided on the rotary plate, and a signal from the mark means. A motor inspection device comprising two signal detecting means for detecting and a judging means for judging the quality of the motor based on the detection result of the detecting means.