JPH1078361A - Rotating torque check device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To objectively and precisely check the rotating torque by holding a matter to be measured by a chuck to which the torque from a driving source is added through a torque sensor to rotate it. SOLUTION: A matter to be measured is moved under a checking position. Opened chucks 47 are situated on both sides of a knob 49 to be measured. The chucks 47 hold the knob 49 by an air cylinder 49. An AC servo motor 29 rotates the knob 49. The rotating motion is transmitted from the AC servo motor 29 to the chucks 47 through an axial center correcting an Oldham's coupling 40 and a load cell 41. The AC servo motor 29 rotates at a speed determined by a servo circuit, and checks the torque under a fixed condition. The output of the strain gauge of the load cell 41 is converted into a digital signal and read into a computer. Since the numerical value digitally displayed by the computer is checked, the reliability of rotating torque of the knob 49 is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation torque checking device, and more particularly to a rotation torque checking device for automatically checking the rotation torque of an object to be measured.

[0002]

2. Description of the Related Art For example, switches of lamps of automobiles and switches of various electronic devices are turned ON / OFF by rotating them with fingers. Therefore, in a device in which a switch having such a rotary knob is incorporated into various devices, it is checked whether or not the above-mentioned switch operates properly after completion.

In the conventional inspection, a worker manually turns a knob of a switch to check whether or not the operation accompanying the turning operation is actually achieved. In addition, it checks whether the knob can be rotated smoothly.

[0004]

The check of the operation state accompanying the rotation of the knob is performed by checking whether the intended operation is achieved.
For example, since the determination is made as to whether the lamp is turned on or whether the motor is rotating, the result is clear and the determination of the quality is surely performed.

However, the checking of the rotational torque, that is, the check of whether or not the knob rotates smoothly, is a test for intuitively judging the reaction force transmitted to the finger during the turning operation, and therefore, is judged by human feeling. Was to be held. Therefore, the check standard changes depending on the degree of worker fatigue or the difference in sense among workers, and it is not always possible to objectively check the rotational torque, that is, check whether the rotation is smooth. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a rotation torque checking device capable of objectively and accurately checking a rotation torque. .

[0007]

SUMMARY OF THE INVENTION The present invention provides a drive source for generating a rotational torque, a torque sensor interposed in a transmission path of torque from the drive source, and a drive source via the torque sensor. And a chuck to which a torque is applied from the chuck, and wherein the object to be measured is gripped and rotated by the chuck.

[0008] The torque sensor may be a load cell comprising an elastic body torsionally deformed by rotational torque and a strain gauge joined to a surface of the elastic body.

The drive source may be a servomotor whose rotation speed is controlled by a servo circuit.

Alternatively, a coupling for axial center correction may be interposed between the drive source and the torque sensor.

[0011]

1 to 3 show a rotation torque checking device according to an embodiment of the present invention.
This rotation torque checking device is a flat base 10.
It has. An upright support plate 11 is attached to an end of the base 10 so as to be upright. A pair of left and right guide rails 12 are attached to the front side of the upright support plate 11 so as to extend in the vertical direction. As seen from the side, as shown in FIG. 2, the slider 14 attached to the back side of the L-shaped elevating frame 13 is guided by the guide rail 12 so as to be slidable in the vertical direction. ing.

An opening 18 is formed in the upright support plate 11, and an L-shaped bracket 19 is fixed to the back side of the elevating frame 13 so as to pass through the opening 18.
As shown in FIG. 2, the distal end of the piston rod 23 of the air cylinder 20 is connected to the distal end of the L-shaped bracket 19 via the floating joint 22. ing.

An auxiliary base 26 is arranged on the lifting frame 13. The auxiliary base 26 supports a motor base 28 via a support rod 27. An AC servomotor 29 is mounted upright on the motor base 28.

The auxiliary base 26 is provided with the front and rear guide rods 3.
2 and 33, it is supported on the lifting frame 13 so as to be able to move up and down. The auxiliary base 26 is moved up and down by an air cylinder 34. A compression coil spring 35 is interposed between the auxiliary base 26 and the lifting frame 13 so as to transmit the output stroke of the piston rod of the air cylinder 34 to the auxiliary base 26.

That is, the piston rod 36 of the air cylinder 34 projects upward, and a support plate 37 is fixed to the upper end of the piston rod 36. The upper end of the coil spring 35 is connected to the support plate 37 and the lower end of the compression coil spring 35 is connected to the auxiliary base 2.
6 is supported by floating.

Accordingly, the auxiliary base 26 is moved up and down by the air cylinder 34 via the piston rod 36, the support plate 37 and the compression coil spring 35 with respect to the lifting frame 13. An AC servo motor 29 and an Oldham coupling 4 are provided on the auxiliary base 26.
0, the load cell 41, the air cylinder 46, and the chuck 47 are supported.

An output shaft 39 of the AC servomotor 29 on the motor base 28 is connected to an input side of a load cell 41 via an Oldham coupling 40.

An air cylinder 46 is mounted on a drive shaft 45 protruding from the lower end of the load cell 41, and a pair of left and right chucks 47 are mounted on the front end side of the air cylinder 46 so as to be freely opened and closed. .
The knob 47 of the device under test 48 is gripped by the chuck 47 so as to be freely opened and closed.

The object to be measured 48 is automatically transferred by the transfer device 50 to the lower side of the chuck 47 of the check device.

Next, load cell 41 for torque measurement
The load cell 41 shown in FIG.
Has upper and lower flanges 54, and elastic plates 55 made of a steel plate are arranged between these flanges 54 so as to be orthogonal to each other. These elastic plates 5
Strain gauges 56 are adhered to the surfaces of the elastic members 55, respectively, and the resistance wires constituting the strain gauges 56 expand and contract in accordance with the torsional deformation of the elastic plate 55, thereby causing a change in resistance.

Next, the Oldham coupling 40 interposed between the motor 29 and the load cell 41 comprises a driving plate 61, an intermediate plate 62 and a driven plate 63 as shown in FIG. The groove 6 is formed on the lower surface of the drive plate 61.
4 are formed, and the groove 64 receives the protrusion 65 on the upper surface of the intermediate plate 62. A ridge 66 provided on the lower surface of the intermediate plate 62 and orthogonal to the ridge 65 is received in the groove 67 of the lower driven plate 63.

In the above configuration, the transfer device 50
The object 48 is moved to a measurement position, that is, a position below the chuck 47 of the air cylinder 46. On the other hand, the lifting / lowering frame 13 on the measurement side is gently lowered by the coarse movement air cylinder 20, and the auxiliary base 26 is lowered with respect to the lifting / lowering frame 13 by the fine movement air cylinder 34. Then, the chuck 47 of the air cylinder 46 moves to a position on both sides of the knob 49 of the measured object 48. In such a state, the knob 49 opened as shown by a chain line in FIG. 1 is closed by the air cylinder 46 as shown by a solid line. Thus, the knob 49 of the device under test 48 is gripped by the chuck 47.

In such a state, the AC servomotor 29 is rotated by a predetermined rotation angle. Then, the rotation torque is transmitted to the chuck 47 via the output shaft 39, the Oldham coupling 40, the load cell 41, the drive shaft 45, and the air cylinder 46, and the knob 47 of the DUT 48 is rotated by the chuck 47.

At this time, the rotating torque for rotating the knob 49 by the chuck 47 is applied to the load cell 41 shown in FIG.
Is measured by a strain gauge 56.

When a rotational torque is applied to the load cell 41,
The pair of elastic plates 55 combined in a cross shape are each subjected to torsional deformation. Therefore, the strain gauge 5 attached to the surface of the elastic plate 55
6, the resistance wire is stretched, and its resistance value changes. Such a change in the resistance value is taken out through a bridge circuit connecting the strain gauge 56, and the output of such a bridge circuit is taken as A
The data is converted by a D converter, input to a computer, and the computer performs a judging operation.

An Oldham coupling 40 is interposed to absorb the deviation between the output shaft 39 of the AC servomotor 29 and the axis of the load cell 41 during such torque measurement.
0 absorbs the relative eccentricity of both axes. Therefore, the periodic fluctuation of the torque due to the eccentricity is reliably prevented, and more accurate measurement is performed.

As described above, the rotational torque measuring device according to the present embodiment comprises an AC servomotor 29, an Oldham coupling 40, a linear motor guide including the guide rail 12 and the slider 14, and the vertical movement cylinder 20. , 3
4, a load cell 41, and an air cylinder 46 having a chuck 47 at a tip end thereof are main components.

When the object 48 supplied while being supported by the pallet 51 by the transport device 50 is moved below the check position, the air cylinder 20 lowers the lifting frame 13 and the air cylinder 34 assists. When the base 26 is lowered, the opened chuck 47 is positioned on both sides of the knob 49 of the device 48 to be measured.

Thereafter, the knob 49 is gripped by the chuck 47 by the air cylinder 46, and the knob 49 is rotated by the AC servomotor 29 to check the torque.

The rotational motion is transmitted from the AC servomotor 29 to the chuck 47 via the Oldham coupling 40 and the load cell 41 for axial center correction. At this time A
The C servo motor 29 rotates at a speed determined by the servo circuit, and a torque check is always performed under constant conditions. The output of the strain gauge 56 of the load cell 41 is converted into a digital signal by an AD converter, and is taken into a computer so that a check is performed.

Therefore, in the assembly check of a product having the knob 49 for performing the rotation operation, the rotation torque of the knob 49 is checked by using the load cell 41 having the strain gauge 56.
Is used to numerically perform the check, so that the variation in the check can be reduced.

From this, the rotation torque check can be automated. In addition, since the numerical value digitally displayed by the computer is checked without relying on the feeling of the operator as in the case of a manual check, the reliability of the rotational torque check of the knob 49 is significantly improved. Become.

[0033]

As described above, the present invention provides a drive source for generating a rotational torque, a torque sensor interposed in a transmission path of the torque from the drive source, and a torque from the drive source via the torque sensor. And a chuck to which an object to be measured is held and rotated by the chuck.

Therefore, according to the present invention, it is possible to detect the rotational torque of the object to be measured by the torque sensor, and it is possible to measure the rotational torque accurately and objectively.

According to the configuration in which the torque sensor is a load cell including an elastic body torsionally deformed by the rotational torque and a strain gauge joined to the surface thereof, the rotational torque is changed by a change in the resistance value of the strain gauge of the load cell. Be able to measure accurately.

According to the configuration in which the drive source is a servomotor whose rotation speed is controlled by a servo circuit, the condition is kept constant by setting the rotation speed of the motor at the time of torque measurement to a constant value. It becomes possible.

According to the structure in which the coupling for correcting the axial center is interposed between the drive source and the torque sensor, the generation of the error due to the displacement of the axial center is prevented by the coupling for correcting the axial center. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a front view of a rotation torque checking device.

FIG. 2 is a side view of the rotation torque checking device.

FIG. 3 is a plan view of the rotation torque checking device.

FIG. 4 is an external perspective view of a load cell.

FIG. 5 is an exploded perspective view of the Oldham coupling.

[Explanation of symbols]

10 ‥‥ base, 11 ‥‥ upright support plate, 12 ‥‥ guide rail, 13 ‥‥ lifting frame, 14 ‥‥ slider, 18
‥‥ Opening, 19 ‥‥ L-shaped bracket, 20 ‥‥ Air cylinder, 21 ‥‥ Piston rod, 22 ‥‥ Floating joint, 26 ‥‥ Auxiliary base, 27 ‥‥ Support rod, 28 ‥‥ Motor stand, 29 ‥‥ AC servo motor, 3
2, 33 ‥‥ guide rod, 34 ‥‥ air cylinder, 3
5 ‥‥ compression coil spring, 36 ‥‥ piston rod, 37
‥‥ Support plate, 39 ‥‥ output shaft, 40 ‥‥ oldham coupling, 41 ‥‥ load cell, 45 ‥‥ drive shaft, 46
‥‥ Air cylinder, 47 ‥‥ Chuck, 48 ‥‥ Measurement object, 49 ‥‥ Knob, 50 ‥‥ Conveyor, 51 ‥‥ Pallet, 54 ‥‥ Flange, 55 ‥‥ Elastic plate, 56 ‥‥ Strain gauge, 61 ‥‥ drive plate, 62 ‥‥ intermediate plate, 63 ‥
‥ Follower plate, 64 、 groove, 65, 66 、 ridge, 67 ‥
‥ groove

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masanobu Akazawa 6-7-35 Kita Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation

Claims (4)

[Claims] A driving source for generating a rotational torque; a torque sensor interposed in a transmission path of the torque from the driving source; a chuck to which a torque from the driving source is applied via the torque sensor; And a rotating torque check device characterized in that the object to be measured is gripped and rotated by the chuck. 2. The rotating torque check device according to claim 1, wherein the torque sensor is a load cell including an elastic body torsionally deformed by a rotating torque and a strain gauge joined to a surface of the elastic body. 3. The rotation torque check device according to claim 1, wherein the drive source is a servomotor whose rotation speed is controlled by a servo circuit. 4. The rotation torque checking device according to claim 1, wherein a coupling for correcting an axial center is interposed between the drive source and the torque sensor.