JPS60111128A - Torque sensor - Google Patents

Abstract

PURPOSE:To detect exactly shaft torque by detecting a reaction force generated in a supporting member of a stator as a variation of load applied to the stator when the rotor is braked. CONSTITUTION:A titled torque sensor is constituted of a rotor which rotates integrally with a shaft 1A, a stator 26 which contacts this rotor 6 and damps the shaft 1A by frictional resistance, and a detecting member 21 for controlling movement of the stator 26 in the rotating direction of the rotor 6. Also, it is provided with a detecting part for detecting a reaction force when the stator 26 executes a damping operation to the detecting member 21, and a sensor for outputting a signal which is proportional to the reaction force working on this detecting part.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a torque sensor that measures torque applied to a shaft.

Conventionally, in unreel stands such as paper cutters and winders, it is possible to detect the tension of a sheet unwound from the unreel stand and adjust a brake for braking the sheet based on the detected tension. A known method for detecting the tension is to detect the torque applied to a rotating shaft that supports a rolled sheet.

FIG. 1 shows a conventional example of a torque sensor used to detect the torque, and this torque sensor includes a strain gauge 2A mounted on the outer periphery of a shaft 1 that rotates together with a rolled sheet.
2B, and deform these strain gauges 2A and 2B along with the strain on the shaft 1, and by this deformation, the strain gauges 2A and 2B
The torque applied to the shaft 1 is detected as an electrical signal by changing the electrical resistance of the shaft 2B. and,
The change in electrical resistance of the strain gauges 2A and 2B is based on the axis 1
Through the slip rings 3, 3, etc., which rotate together with the It is designed to be detected by a resistance measuring circuit (path shown).

However, when the signals from the strain gauges 2A and 2B are taken out through the slip ring 3 and the brush 4, wear and oxidation (
There is a problem that noise is mixed into the detection signal due to causes such as corrosion, which causes measurement errors. There is a problem that maintenance is time consuming.

Therefore, a rotating transformer is used in place of the slip ring 3 and brush 4 to create the strain gauge 2A.

I can think of connecting 2B and the resistance measurement circuit,
This method has the problem that the rotary transformer is expensive and is susceptible to external magnetic fields.

In view of the above circumstances, the applicant proposed a torque sensor in Japanese Patent Application No. 57-220549.

This "torque sensor" deforms the support member that stops the rotation of the stator by the reaction force generated during braking on the stator of the brake that brakes the rotating shaft, and measures the amount of deformation with a strain gauge to determine whether the rotation The present invention aims to detect the torque generated on the shaft, and the present invention aims to detect the torque of the rotating shaft without using a slip ring or a rotating transformer.
It was done for a purpose. - Hereinafter, the present invention will be explained based on an embodiment shown in FIGS. 2 to 5.

The drawing shows the invention as a sheet cutter (or winder)
This figure shows an example of application to sheet tension control in an unreel stand.

First, to explain the principle of tension control according to FIG. 2, the unreel stand 5 has a winding roll 6
is rotatably supported, and the sheet 7 unwound from the take-up roll 6 is taken up by a pinch roll 8 in the direction of the arrow in FIG. Then, the traveling distance S ('Tl1) of the sheet 7 is measured by the rotation of the paper roll 9, the number of rotations N (times) of the take-up roll 60 is measured by the proximity switch 10, and further, by the torque sensor 11 of the present invention, Brake 1 for braking the winding roll 2
The torque Q (kQ·Tl'I) generated at the seat 2 is measured, and these measured data are input to the control device 13 to calculate the tension T (kQ/cm) of the seat 7.

That is, by calculating the equation (1) from the rotation speed N and the sheet travel amount S during this time, the winding radius r (Tr
i) is obtained, and from this radius r, sheet width W (cm), and the torque Q, the lungage T per unit width applied to the sheet is
is T-Q/r W......Equation (2), and to calculate this Equation (2), j:Resheet 3
The tension T (kQ/cm) is measured.

Furthermore, based on the measurement data of the tension T, the brake 1
The tension hT of the seams 1-7 can be maintained constant by outputting an electric signal for controlling the seams 1-7, converting this signal into a pneumatic signal by the electro-pneumatic converter 14, and feeding it back to the brake 12. .

The Tao Fue 9M Explosion 1b is an operation panel for inputting data such as Taekhon settings, banknotes, etc., and numeral 16 is a magnetic piece that activates the proximity switch.

Next, to explain the torque sensor that is the gist of the present invention, reference numeral 17 in the figure is a casing, and this casing 17 is rotatably attached via a bearing 18 to the shaft 1A that rotates together with the winding roll. It is being On the shaft 1A adjacent to the casing 17, there is a stator support member 19 that supports a brake pad of a brake, which will be described later.
is rotatably attached via a bearing 20, and this stator support member 19 is connected to one detection portion vJ21 provided on the outer periphery of the casing 17 via a connecting bolt 22, so that its rotation is controlled. It is becoming regulated.

In addition, the reference numeral 23 in the figure is a support bracket, and this support bracket 23 fixes the casing 17 to an unreel stand or the like to prevent its rotation.

The brake 12 mounted on the shaft 1A adjacent to the stator support member 19 is, for example,
This brake '12 is manufactured by Vo company and has a trade name #1401 to #1404, and this brake '12 is connected to the stator support part 4.
An air cylinder (path shown) provided on the stator 24 supported by the shaft 119 causes the brake pad (path shown) to protrude in a direction parallel to the axis 1A.
The shaft 1A is braked by the frictional resistance between the brake pad and the rotary disc 25 by contacting the opposing surfaces of the rotating discs 25 and 25 that rotate together with the shaft 1A. Further, the rotating disk 25 is attached via bolts 27 to a boss 26 fixed to the shaft 1A via a key or the like, and the surface of the rotating disk 25 promotes dissipation of frictional heat generated during braking. 28 fins for
There are many.

The detection member 21 includes a plate-shaped portion @ 29 that is elastically deformed by a reaction force when the stator 24 brakes the rotating disk 25, and a base end portion of the plate-shaped member 29 is fixed to the casing 17 via a bolt 30. The attachment is made up of members 31 and a connecting member 32 that connects the tip of the plate-like member 29 to the connecting bolt 22. The deformation of the plate-shaped member 29 is converted into an electrical signal by a sensor S such as a resistance wire strain gauge, a differential transformer, or a piezoelectric element, and is input to the control device @13.

Furthermore, as shown in FIG. 4, the stator support member 19 supports the stator 24 at four locations in the circumferential direction, and in the direction parallel to the axis 1A when bringing the brake pad into contact with the rotating disk 25. It has the rigidity to withstand the force of.

In the torque sensor configured as described above, the axial load generated during braking is supported by the stator support member 19, and the rotational torque about the shaft 1A is concentrated on the detection member 21. Therefore, axis 1A
The torque applied to is detected by the sensor as the amount of deformation of the detection member 21.

A sheet cutter using this torque sensor,
In winders, etc., the tension can be easily controlled by using the brake device and sensor that are essential to the unreel stand as a single unit, without having to separately install tension detection means such as sensing rolls that have been used in the past. .

Next, FIGS. 6 and 7 show another embodiment of the present invention, in which a brake disc 24 rotates integrally with the shaft 1B.
In a brake that brakes the shaft by bringing brake pads 25 into contact with
The stator 26 is supported by a disc-shaped stator 26 that is rotatably provided, and the stator 26 and the pedestal 27 are connected by an elastic member 28 such as a coil spring. Torque is detected by deforming the elastic member 28 and converting the amount of displacement of the arm 29, which rotates together with the stator 26, into an electrical signal by a sensor S' such as a differential transformer.

Incidentally, instead of the elastic member 28 of the embodiment described above, for example, a fluid pressure cylinder may be used, and the amount of displacement of this fluid pressure cylinder may be detected as a pressure signal of a change in the cylinder internal pressure.

Further, the technique of the present invention is not limited to the brake of the method of the above-described one embodiment, but includes a rotor that rotates integrally with the shaft and a stator that contacts the rotor and brakes it. Of course, the present invention can be applied to various types of brakes.

As is clear from the above description, the present invention detects the reaction force generated in the support member of the stator that comes into contact with the rotor of the brake to brake it, as the amount of change in the load applied to the stator. For example, it is characterized by detecting shaft torque by converting it into an electric signal, and it is possible to extract a signal proportional to torque without using a slip ring, a rotating transformer, etc., and using the slip ring, etc. This has the effect of preventing noise from entering, which would otherwise be a problem, and reducing maintenance effort. Furthermore, the present invention has the advantage that it can be widely applied to various rotating shafts on which braking is performed.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the configuration of a conventional example of a torque sensor, Figs. 2 to 5 show an embodiment in which the present invention is applied to an unreel stand, and Fig. 2 is an explanatory diagram of the measurement principle. 3 is a sectional view, FIG. 4 is a view taken along the line IV-IV in FIG. 3, FIG. 5 is a view taken along the line v-v in FIG. Another embodiment in which the invention is applied to an unreel stand is shown, in which FIG. 6 is a side view and FIG. 7 is a front view. 1A...shaft, 5...unreel stand, 6...take-up roll, 11...torque sensor, 12...brake, 13...
...Control device, 19...Stator support member, 21
...Detection member, 24...Brake disc, 25...Brake pad, 26...
...Stator, 28...Elastic member. Figure 1 Figure 6 Figure 7

Claims (1)

[Claims] It is composed of a rotor that rotates together with the shaft, a stator that comes into contact with the rotor and brakes the shaft by frictional resistance, and a detection member that restricts movement of the stator in the rotational direction of the rotor. , wherein the detection member is provided with a detection section that detects a reaction force when the stator performs a braking operation, and a sensor that outputs a signal proportional to the reaction force acting on the detection section. sensor.