JPH07198511A - Transmission torque detector - Google Patents

Abstract

PURPOSE:To easily adjust the range of transmission torque detection from the outside of a device and also adjust it while watching the operating state of the device without stopping the device. CONSTITUTION:A rotary shaft 3 is fixed onto the rotating center of a working crank that is rotated interlocking with the movement of a helical gear a and limit working pieces 13a and 13b are provided on the shaft 3 to operate a limit switch 14 at a specified rotating angle. Then a rotary plate 6 is fixed onto the shaft 3, and a front interlocking plate 7 engaged with the plate 6 that is rotated by specified angle in one direction and a rear interlocking plate 10 engaged with the plate 6 that is rotated by specified angle in reverse direction are provided on the shaft 3 as to be freely rotatable, futher a front spring 8 to be compressed in the rotating direction of the plate 7 is prepared. Furthermore, one end of the spring 8 is supported with the plate 7, while the other end thereof is supported with the tip end of a front adjusting screw 9 that is movably engaged freely forwards and backwards. A rear spring 11 to be compressed in the rotating direction of the plate 10 is prepared, and one end of the spring 11 is supported with the plate 10, while the other end thereof is supported with the tip end of a rear adjusting screw 12 that is movably engaged freely forwards and backwards.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention utilizes a fact that a helical gear provided in the middle of a power transmission mechanism moves in the axial direction in proportion to the magnitude of the transmission torque, thereby making the magnitude of the transmission torque large. The transmission torque detecting device for detecting the transmission torque, in particular, the magnitude of the transmission torque to be detected can be adjusted from the outside of the device and can be adjusted without stopping the device. Furthermore, the transmission torque can be adjusted while observing the drive status of the device. The present invention relates to a detection device.

[0002]

2. Description of the Related Art Conventionally, a helical gear (also called an oblique gear or a helical gear) is provided in the middle of a power transmission mechanism, and the helical gear moves in the axial direction in proportion to the magnitude of the transmission torque. There is known a transmission torque detecting device that detects the magnitude of the transmission torque by utilizing. The transmission torque detection device is used to detect an overload, for example, when the power transmission mechanism is overloaded.

In a conventional transmission torque detecting device, for example, as shown in FIG. 7, limit switches 51 are provided on both sides of the helical gear a, and the helical gear a is proportional to the magnitude of the transmission torque. The limit switch 51 operates when a certain distance or more is moved in the axial direction to detect a predetermined transmission torque, for example, an overload torque.

Further, in the conventional transmission torque detecting device, the coil spring 5 is attached to the main shaft b to which the helical gear a is attached.
2 is externally mounted, and an adjusting nut 53 for pressing the coil spring 52 against the helical gear a is screwed onto the main shaft b, and the adjusting nut 53 is moved in the front-rear direction of the main spindle b by a screw movement to move the helical gear a. The magnitude of the detected transmission torque is adjusted by adjusting the strength of the coil spring 52 to be pressed.

[0005]

However, in the conventional transmission torque detecting device, the coil spring that pushes the helical gear a by moving the adjusting nut 53 screwed on the main shaft b to which the helical gear a is attached to move back and forth. Although the structure is such that the strength of 52 is adjusted, since this adjusting nut 53 is inside the device, when adjusting the adjusting nut 53, it is necessary to stop and adjust the device, which is troublesome and troublesome. there were.

The present invention has been made in view of the above problems and was devised to solve the problems. The object of the present invention is to determine the magnitude of the transmission torque detected from the outside of the device. It is an object of the present invention to provide a transmission torque detecting device that can be easily adjusted, can be adjusted without stopping the device, and can be adjusted while observing the drive status of the device.

[0007]

In order to achieve the above object, the invention of claim 1 rotates in conjunction with movement of a helical gear provided in the middle of a power transmission mechanism in the axial direction. An operating crank is provided, one end side of the rotating shaft is fixed at the center of rotation of the operating crank, and a limit switch is provided on the peripheral side of the rotating shaft that rotates integrally with the rotation of the operating crank.
A limit actuating piece for actuating a limit switch at a predetermined turning angle is provided on the turning shaft, and a turning plate is fixedly mounted on the turning shaft that is rotatably attached to the main body case, and the turning plate is turned by a predetermined angle in one direction. An interlocking plate that engages with the rotating plate is provided on the rotating shaft in a freely rotatable manner, and a spring that is engaged with the rotating plate and compressed in the rotating direction of the interlocking plate that rotates in one direction is provided. The one end of the spring is supported by the interlocking plate, and the other end of the spring is supported by the tip of the adjusting screw screwed in the main body case so as to be able to move forward and backward.

According to the second aspect of the present invention, there is provided an operating crank which rotates interlockingly with the movement of the helical gear provided in the middle of the power transmission mechanism in the axial direction. One end side of the rotary shaft is fixed, and a limit switch is provided on the peripheral side of the rotary shaft that rotates integrally with the rotation of the operating crank, and the limit switch is operated at a predetermined rotary angle on the rotary shaft. A limit interlocking plate is provided, a rotating plate is fixedly mounted on a rotating shaft that is rotatably mounted on the main body case, and a front interlocking plate that engages with the rotating plate that is rotated by a predetermined angle in one direction, A rear interlocking plate that engages with a rotary plate that is rotated in the opposite direction by a predetermined angle is provided on the rotary shaft so as to be freely rotatable in front of and behind the rotary plate, and is engaged with the rotary plate. A front spring that is compressed in the rotation direction of the front interlocking plate that rotates in the direction is provided, and one end of the front spring is attached to the front interlocking plate. The other end of the front spring is supported by the tip of a front adjusting screw that is screwed into the main body case so that it can move forward and backward, and the rear interlocking plate that rotates in the opposite direction is engaged with the rotary plate. A rear spring that is compressed in the moving direction is provided, one end of the rear spring is supported by the rear interlocking plate, and the other end of the rear spring is supported by the tip of the rear adjusting screw that is screwed into the main body case so that it can move back and forth. It has a structure as described above.

[0009]

The present invention having the above-described structure operates as follows. That is, when the transmission torque acts, the helical gear moves in the axial direction, the operating crank rotates in conjunction with the movement of the helical gear, and the rotary shaft fixed at the rotational center of the operating crank also rotates. To do. The rotating plate is also rotated by the rotation of the rotating shaft, and the rotating rotating plate engages with the interlocking plate to rotate the interlocking plate in conjunction with the rotating direction of the rotating plate. The interlocking plate rotates in the direction of compressing the spring, and receives the resistance due to the compressing spring, a reverse resistance rotation moment is generated in the interlocking plate, and this reverse resistance rotation moment is applied to the interlocking plate. The resistance rotation moment in the opposite direction is transmitted to the rotary plate to which the rotary plate is fixedly provided, and the rotary shaft receives the resistance to make it difficult to rotate.

Therefore, while the limit actuating piece of the rotating shaft does not easily contact the limit switch and the limit actuating piece does not contact the limit switch, the limit switch does not operate and the transmission torque is not detected. . When the rotary shaft overcomes the resistance of the spring and rotates further, the limit operating piece comes into contact with the limit switch to operate. As a result, the limit switch detects the transmission torque having a predetermined strength. If the magnitude of the transmission torque having the predetermined strength is set to the value of the overload torque, the overload torque will be detected.

In the above operation, by rotating the adjusting screw to move the tip end side forward and backward to expand and contract the spring, it is possible to adjust the strength of the reverse resistance rotation moment by the spring acting on the rotating shaft. When the tip side of is advanced,
The reverse resistance rotation moment due to the spring increases,
The value of the transmission torque detected becomes large. When the tip end side of the adjusting screw is retracted, the resistance rotation moment in the opposite direction due to the spring becomes small, and the value of the detected transmission torque becomes small.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described more concretely with reference to the embodiments shown in the drawings. Here, FIG. 1 is a mechanical view of the transmission torque detection device, FIG. 2 is a rear view of the transmission torque detection device, FIG. 3 is a side sectional view of the transmission torque detection device, and FIG.
3 is a sectional view taken along the line AA of FIG. 3, FIG. 3B is a sectional view taken along the line BB of FIG. 3, and FIG.

In the figure, the transmission torque detecting device 1 utilizes the fact that a helical gear a provided in the middle of a power transmission mechanism moves in the axial direction in proportion to the magnitude of the transmission torque. Is a device for detecting the size of the.

In the transmission torque detecting device 1, a rotating shaft 3 is arranged inside the body case 2 in the front-rear direction. Both ends of the rotary shaft 3 are rotatably supported by the main body case 2, and both ends of the rotary shaft 3 project outward from the main body case 2. At the front end of the rotary shaft 3 protruding to the front side of the main body case 2, a base end of an operating crank 4 provided perpendicularly to the rotary shaft 3 is fixed. Further, the front end side of the operating crank 4 is bent at a right angle so as to be parallel to the rotary shaft 3, and the front end side is bent toward the outer side of the rotary shaft 3. The roller 4 is attached to the bent tip end.
a is rotatably attached.

On the other hand, a helical gear a for transmitting power is axially provided on a main shaft b, and a moving groove 5 is attached to one side surface of the helical gear a so as to be connected thereto. The moving groove 5 is mounted on the main shaft b. The moving groove 5 has a circular annular shape, and the main shaft b is inserted into the annular hollow hole. The circular annular moving groove 5 has an engaging groove 5a formed on the circumferential side surface over the entire circumference in the circumferential surface direction. This engagement groove 5
The roller 4a of the operating crank 4 is inserted and engaged in a. That is, both sides of the roller 4a of the operating crank 4 are sandwiched between the groove side surfaces of the engaging groove 5a.

When the helical gear a moves in the axial direction of the main shaft b, the moving groove 5 also moves integrally, and when this moving groove 5 moves, the operating crank 4 in the engaging groove 5a of the moving groove 5 is moved.
Similarly, the roller 4a also moves, and the operating crank 4 rotates in the moving direction of the roller 4a with the base end thereof as the center of rotation. Since the rotating shaft 3 is fixed to the base end of the operating crank 4, when the operating crank 4 rotates, the rotating shaft 3
Also rotates together.

A rotating plate 6 is integrally fixedly attached to the outer periphery of the rotating shaft 3 inside the body case 2. The rotating plate 6 has a circular shape, and a through hole is formed at the center thereof, and the rotating shaft 3 is attached to the through hole. The rotary plate 6 has a front surface facing the operating crank 4 and a front operating pin 6a on the circumferential side thereof.
Is projected toward the front. Further, on the rear surface which is the back surface side of the front surface, the rear operation pin 6b is provided on the circumferential edge side.
Is projected toward the rear. The front operation pin 6a and the rear operation pin 6b are provided on the same extended straight line.

A front interlocking plate 7 and a rear interlocking plate 10 are rotatably provided on the front and rear rotary shafts 3 with the rotary plate 6 interposed therebetween. The front interlocking plate 7 and the rear interlocking plate 10 are engaged with the rotating plate 6 in opposite directions and rotate in opposite directions.

The front interlocking plate 7 has a circular shape, and a front through hole 7d slightly larger than the outer diameter of the rotary shaft 3 is formed in the center of rotation thereof. The rotating shaft 3 is attached to 7d by penetrating it freely.

The front interlocking plate 7 is provided with a front interlocking pin 7a on the rear surface side facing the rotating plate 6 so as to project rearward.
The front interlocking pin 7a is the front operating pin 6 of the rotating plate 6 that rotates.
It is provided at a position where it hits a. That is, the front interlocking pin 7a is attached so as to be positioned on the same rotation locus as the front operating pin 6a, and when the rotating plate 6 rotates in the arrow A direction by a certain angle, the front operating pin 6a is rotated. The front operating pin 6a, which rotates, presses the front interlocking pin 7a to rotate the front interlocking plate 7 in the same direction as the arrow A in the same direction. .

Further, a front spring 8 is attached to the front interlocking plate 7 on the circular peripheral side thereof. One end of the front spring 8 is received and supported by a front support pin 7b protruding from the front interlocking plate 7. The other end of the front spring 8 is received and supported by the tip of a front adjusting screw 9 screwed into the body case 2. The front spring 8 is attached so as to compress when the front interlocking plate 7 rotates in the direction of arrow A. That is, the front spring 8 supported on one end side by the front support pin 7b is disposed on the other end side along the direction of the arrow A and is supported by the tip of the front adjustment screw 9.

After the front interlocking plate 7 is rotated in the direction of arrow A, the front interlocking plate 7 is rotated in the opposite direction by the spring force of the front spring 8 in a compressed state because the pressing force from the rotary plate 6 is lost. A front anti-rotation pin 7c is provided to prevent it from turning when it moves. The front rotation stop pin 7c is provided at its tip end side at a position where the front support pin 7b of the front interlocking plate 7 rotating in the opposite direction abuts. This front rotation stop pin 7c
One end of the is attached inside the body case 2.

The front adjusting screw 9 is screwed to the main body case 2 so as to advance and retreat by turning. By rotating this front adjustment screw 9 to move it back and forth,
The front spring 8 whose other end is connected to the tip of the front adjusting screw 9 is compressed along the peripheral side of the front interlocking plate 7 as a whole. One of the repulsive forces of the front spring 8 is transmitted to the front support pin 7b and is received by the front rotation stop pin 7c, and the rotation of the front interlocking plate 7 is stopped. The other repulsive force of the front spring 8 is supported by the tip of the front adjusting screw 9. Therefore, the front interlocking plate 7 does not rotate even if the front adjusting screw 9 is rotated back and forth to move forward and backward, and the front spring 8 moves forward and backward when the front adjusting screw 9 moves forward and backward.
Only expands and contracts.

The front adjusting screw 9 changes the compression amount of the front spring 8 to change the repulsive force of the spring, whereby the rotating shaft 3 is rotated.
From the rotary plate 6, the front operating pin 6a, and the front interlocking pin 7a to the front interlocking plate 7 sequentially. The strength of the rotational force acting on the rotary shaft 3 until the limit switch 14 described later provided on the rear end side of the rotary shaft 3 is actuated is adjusted, and it acts on the main shaft b on which the helical gear a is mounted. The structure is such that the magnitude of the detected value of the transmitted torque can be adjusted.

The rear interlocking plate 10 has a circular shape,
A rear through hole 10d, which is slightly larger than the outer diameter of the rotating shaft 3, is formed at the center of rotation, and the rear through hole 10d is formed.
The rotary shaft 3 is attached to the d by penetrating it in a loose fit manner.

The rear interlocking plate 10 is provided with a rear interlocking pin 10a on the front side facing the rotating plate 6 so as to project rearward. The rear interlocking pin 10a is provided at a position where it abuts the rear operating pin 6b of the rotating plate 6. That is,
The rear interlocking pin 10a is mounted so as to be located on the same rotation locus as the rear interlocking pin 6b, and when the rotating plate 6 pivots in the direction of the arrow B by a certain angle, the rear interlocking pin 6b moves. The rotating rear operation pin 6b hits the rear side interlocking pin 10a and presses the rear side interlocking pin 10a to rotate the rear interlocking plate 10 in the same direction as the arrow B direction.

Further, a rear spring 11 is attached to the rear interlocking plate 10 on the circular peripheral side thereof. Rear spring 11
The one end side thereof is received and supported by a rear support pin 10b protruding from the rear interlocking plate 10. Rear spring 1
The other end side of 1 is received and supported by the tip of a rear adjusting screw 12 screwed into the body case 2. The rear spring 11 is attached so as to compress when the rear interlocking plate 10 rotates in the direction of arrow B. That is, the rear spring 11 supported by the rear support pin 10b on one end side is disposed at the other end side along the direction of the arrow B, and the rear adjustment screw 1 is provided.
It is supported at the tip of 2.

When the rear interlocking plate 10 is rotated in the direction of the arrow B and then the pressing force from the rotary plate 6 is released and the rear interlocking plate 10 is rotated in the opposite direction by the spring force of the rear spring 11 in the compressed state. Rear detent pin 1 to prevent turning around
0c is provided. The rear rotation stop pin 10c is provided at its tip end side at a position where the rear support pin 10b of the rear interlocking plate 10 rotating in the opposite direction abuts. One end of the rear rotation stop pin 10c is mounted inside the main body case 2.

The rear adjusting screw 12 is screwed into the main body case 2 so as to move back and forth by turning. By rotating the rear adjustment screw 12 to move it back and forth, the rear spring 11 whose other end is connected to the tip of the rear adjustment screw 12 is wholly compressed along the peripheral side of the rear interlocking plate 10. One of the repulsive forces of the rear spring 11 is transmitted to the rear support pin 10b and is received by the rear rotation stop pin 10c, and the rotation of the rear interlocking plate 10 is stopped. The other repulsive force of the rear spring 11 is supported by the tip of the rear adjusting screw 12. Therefore, even if the rear adjustment screw 12 is rotated and moved back and forth, the rear interlocking plate 10 does not rotate, and the rear spring 11 only expands and contracts as the rear adjustment screw 12 moves forward and backward.

The rear adjusting screw 12 changes the amount of compression of the rear spring 11 to change the repulsive force of the spring, so that the rotating shaft 3, the rotating plate 6, the rear operating pin 6b, and the rear interlocking pin 10a are connected. It corresponds to the rotational force sequentially transmitted to the rear interlocking plate 10. The strength of the rotational force acting on the rotary shaft 3 until the limit switch 14 described later provided on the rear end side of the rotary shaft 3 is actuated is adjusted, and it acts on the main shaft b on which the helical gear a is mounted. The structure is such that the magnitude of the detected value of the transmitted torque can be adjusted.

A circular limit actuating plate 13 is fixedly mounted on the rear end of the rotary shaft 3 projecting to the outside of the main body case 2. A limit switch 1 is provided below the limit operating plate 13.
4 are installed. The limit switch 14 is connected to the outside of the body case 2. The limit switch 14 is a device that detects the transmission torque.
The transmission torque is detected when 4 is activated.

The circular limit operating plate 13 has its center portion fixed to the rear end of the rotating shaft 3, and the limit operating plate 13 rotates together with the rotating rotating shaft 3. Limit operating pieces 13a and 13b are provided on the outer peripheral side surface of the limit operating plate 13 so as to project therefrom.

The limit actuating plate 13 rotates and the limit actuating piece 13a or 13b comes into contact with the switch piece 14a of the limit switch 14 to actuate the switch, whereby the limit switch 14 is actuated to rotate the limit switch 14a.
It has a structure to detect the magnitude of the transmission torque of. The limit operating piece 13a and the limit operating piece 13b project to a predetermined angular position with respect to the switch piece 14a of the limit switch 14 installed below the limit operating plate 13 in a neutral state where the helical gear a does not move back and forth. Has been formed.

The operation based on the configuration of the above embodiment will be described below. When the transmission torque acts on the main shaft b,
The helical gear a mounted on the main shaft b is in proportion to the magnitude of the transmission torque, and is in the direction of arrow A or B in the axial direction of the main shaft b.
Move in the direction. For example, when the helical gear a moves in the direction of the arrow A in the axial direction, the following operation is performed.

When the helical gear a moves in the direction of arrow A in the axial direction, the moving groove 5 connected to the helical gear a also moves in the direction of arrow A as a unit. When the moving groove 5 moves in the arrow A direction, the roller 4a at the tip of the operating crank 4 engaged with the engaging groove 5a of the moving groove 5 also moves in the arrow A direction. When the roller 4a at the tip moves in the direction of arrow A,
The working crank 4 rotates about the base end thereof in the arrow A direction, and the rotating shaft 3 whose front end is fixed to the base end of the working crank 4 also rotates in the arrow A direction.

When the rotary shaft 3 rotates in the arrow A direction, the rotary plate 6 integrally fixed to the rotary shaft 3 also rotates in the arrow A direction. When the rotating plate 6 rotates in the direction of arrow A, the front operating pin 6a of the rotating plate 6 rotates in the direction of arrow A, and in front of the front interlocking plate 7 located on the rotation track. It hits the section interlocking pin 7a. The front operating pin 6a, which hits the front interlocking pin 7a, is pressed in the direction of arrow A to rotate in the engaged state.

When the front interlocking pin 7a rotates in the direction of arrow A, the front interlocking plate 7 connected to the front interlocking pin 7a also rotates in the direction of arrow A. When rotating in the direction of arrow A, the rear operating pin 6b of the rotating plate 6 does not abut the rear interlocking pin 10a of the rear interlocking plate 10, and the rear interlocking plate 1
Since 0 is free to rotate with respect to the rotary shaft 3, there is no resistance.

A front spring 8 is attached to the front interlocking plate 7, and when the front interlocking plate 7 rotates in the direction of arrow A, the front spring 8 is compressed and a resistance force due to a spring force is exerted. The resistance is generated in the opposite direction, and the resistance generated by the front spring 8 causes the resistance torque of the front interlocking plate 7 to rotate in the direction of the arrow A in the reverse direction due to the rotation of the front spring 8.

This resistance rotation moment is generated by the front interlocking pin 7
acting on the front operating pin 6a through a.
It also acts on the rotating plate 6 to which a is connected. Further, a resistance rotation moment acts on the rotary shaft 3 through the rotary plate 6, and the rotary shaft 3 becomes difficult to rotate due to the resistance in the rotation in the arrow A direction.

For this reason, the limit operating plate 13 connected to the rear end of the rotating shaft 3 also has a small turning angle in the direction of arrow A, and the limit operating piece 13a of the limit operating plate 13 is the switch piece of the limit switch 14. While the limit actuating piece 13a does not come into contact with the switch piece 14a of the limit switch 14 easily without coming into contact with 14a, the limit switch 14 does not operate and the transmitted torque is not detected.

When the rotating shaft 3 overcomes the resistance force of the front spring 8 and further rotates in the direction of arrow A, the limit operating plate 13
The limit operating piece 13a also rotates in the direction of the arrow A and comes into contact with the switch piece 14a to operate the limit switch 14. As a result, the limit switch 14 detects the transmission torque having a predetermined strength. If the magnitude of the transmission torque having the predetermined strength is set to the value of the overload torque, the overload torque will be detected.

In the above operation, when the front adjusting screw 9 is turned and the tip side thereof is slightly moved in the direction of the arrow Y, the front spring 8 is entirely moved by the length corresponding to the movement of the front adjusting screw 9. Compressed. The resistance rotation moment increases in proportion to the amount of contraction of the front spring 8.

In order to overcome the resistance rotation moment by the front spring 8 and rotate the rotation shaft 3, a larger rotation force than that described above is required. As a result, the magnitude of the detected transmission torque is as described above. Will be a larger value.

On the other hand, when the front adjustment screw 9 is turned to slightly move the tip side thereof in the direction of arrow X, the front spring 8
Extends overall by an amount corresponding to the length that the front adjusting screw 9 has moved. When the amount of contraction of the front spring 8 is small, the resistance rotation moment becomes small in proportion to this.

The resistance rotation moment due to the front spring 8 is smaller than that in the above case. Therefore, in order to overcome this and rotate the rotating shaft 3, a smaller rotating force than the above is sufficient, and as a result, the magnitude of the transmission torque detected becomes a value smaller than the above.

Subsequently, the helical gear a is indicated by the arrow B in the axial direction.
When moving in the direction, the operation is as follows. That is, when the helical gear a moves in the direction of the arrow B in the axial direction, the moving groove 5 connected to the helical gear a also integrally moves in the direction of arrow B and engages with the engaging groove 5a of the moving groove 5. The roller 4a at the tip of the operating crank 4 also moves in the direction of arrow B. The operation crank 4 rotates in the arrow B direction around the base end thereof, and the rotation shaft 3 also rotates in the arrow B direction.

When the rotary shaft 3 rotates in the direction of arrow B, the rotary plate 6 integrally fixed to the rotary shaft 3 also rotates in the direction of arrow B, and the rear part of the rotary plate 6 operates. The pin 6b rotates in the direction of the arrow B and hits the rear interlocking pin 10a located on the rotational locus of the rear interlocking plate 10. Rear interlocking pin 10
The rear operation pin 6b which hits a is pressed in the direction of arrow B to rotate in the engaged state.

When the rear interlocking pin 10a rotates in the direction of arrow B, the rear interlocking plate 10 to which the rear interlocking pin 10a is connected also rotates in the direction of arrow B. When rotating in the direction of arrow B, the front operating pin 6a of the rotating plate 6 does not contact the front interlocking pin 7a of the front interlocking plate 7, and the front interlocking plate 7 does not rotate. Since it is free to rotate, it is in a non-resistance state.

A rear spring 11 is attached to the rear interlocking plate 10. The rear spring 11 is compressed when the rear interlocking plate 10 rotates in the direction of arrow B, and a resistance force due to a spring force is generated in the opposite direction. Due to the resistance of the rear spring 11, a reverse rotation resistance moment is generated by the rear spring 11 with respect to the rotation of the rear interlocking plate 10 in the arrow B direction.

This resistance rotation moment is caused by the rear interlocking pin 1
0a acts on the rear operating pin 6b and also on the rotary plate 6 to which the rear operating pin 6b is connected. Further, a resistance rotation moment acts on the rotary shaft 3 through the rotary plate 6, and the rotary shaft 3 is difficult to rotate due to the resistance in the rotation in the arrow B direction.

Therefore, the angle at which the limit operating plate 13 connected to the rear end of the rotary shaft 3 rotates in the direction of arrow B also becomes small, and the limit operating piece 13b of the limit operating plate 13 becomes the switch piece of the limit switch 14. While the limit actuating piece 13b does not abut the switch piece 14a of the limit switch 14 without easily abutting against the 14a, the limit switch 14 does not operate and the transmission torque is not detected.

When the rotating shaft 3 overcomes the resistance force of the rear spring 11 and further rotates in the direction of arrow B, the limit operating plate 1
The limit actuating piece 13b of No. 3 also rotates in the direction of arrow B and comes into contact with the switch piece 14a to actuate the limit switch 14. As a result, the limit switch 14 detects the transmission torque having a predetermined strength. If the magnitude of the transmission torque having the predetermined strength is set to the value of the overload torque, the overload torque will be detected.

In the above operation, when the rear adjusting screw 12 is rotated and its tip side is slightly moved in the direction of the arrow Y, the rear spring 11 is totally compressed by the amount corresponding to the length of the rear adjusting screw 12. To be done. The resistance rotation moment increases in proportion to the amount of contraction of the rear spring 11.

In order to overcome the resistance rotation moment by the rear spring 11 and rotate the rotation shaft 3, a larger rotation force than that described above is required, and as a result, the magnitude of the detected transmission torque is larger than that described above. Is also a large value.

On the other hand, when the rear adjusting screw 12 is rotated and its tip side is slightly moved in the direction of the arrow X, the rear spring 11 is wholly extended by an amount corresponding to the length of movement of the rear adjusting screw 12. . When the amount of contraction of the rear spring 11 is small, the resistance rotation moment becomes proportionally smaller.

The resistance rotation moment due to the rear spring 11 is smaller than that in the above case. Therefore, in order to overcome this and rotate the rotating shaft 3, a smaller rotating force than the above is sufficient, and as a result, the magnitude of the transmission torque detected becomes a value smaller than the above.

The present invention is not limited to the above embodiments, and it goes without saying that various modifications can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, the case where the front interlocking plate 7 and the rear interlocking plate 10 are provided on the rotary shaft 3 so as to be freely rotatable in front of and behind the rotary plate 6 has been described. The configuration is not limited, and the front interlocking plate 7 may be provided only on the front side of the rotating plate 6 as shown in FIG. 5, or as shown in FIG. The rear interlocking plate 10 may be provided only on the rear side.

[0058]

As is apparent from the above description, according to the transmission torque detecting device of the present invention, the adjusting screw is rotated to move the spring by moving the tip end side forward and backward, thereby acting on the rotating shaft. The strength of the reverse resistance rotation moment generated by the spring can be adjusted, and the magnitude of the detected transmission torque can be easily adjusted from the outside of the device by turning the adjustment screw. Moreover, it is possible to make adjustments without stopping the device, and further, it is possible to make adjustments while watching the drive status of the device.

[Brief description of drawings]

FIG. 1 is a mechanism diagram of a transmission torque detection device showing an embodiment of the present invention.

FIG. 2 is a rear view of the transmission torque detection device showing the embodiment of the present invention.

FIG. 3 is a side sectional view of a transmission torque detecting device showing an embodiment of the present invention.

4A is a cross-sectional view of the main part of AA in FIG.
FIG. 3B is a cross-sectional view of the main part of BB in FIG. (C) is FIG.
3 is a cross-sectional view of a main part of CC of FIG.

FIG. 5 is a mechanism diagram of a transmission torque detection device showing another embodiment of the present invention.

FIG. 6 is a mechanism diagram of a transmission torque detection device showing another embodiment of the present invention.

FIG. 7 is a conventional explanatory view.

[Explanation of symbols]

 1 Transmission Torque Detecting Device 2 Body Case 3 Rotating Shaft 4 Operating Crank 4a Roller 5 Moving Groove 5a Engaging Groove 6 Rotating Plate 6a Front Operating Pin 6b Rear Operating Pin 7 Front Interlocking Plate 7a Front Interlocking Pin 7b Front Support pin 7c Front rotation stop pin 7d Front through hole 8 Front spring 9 Front adjustment screw 10 Front adjustment screw 10 Rear interlocking plate 10a Rear interlocking pin 10b Rear support pin 10c Rear rotation stop pin 10d Rear through hole 11 Rear spring 12 Rear adjustment screw 13 limit operating plate 13a limit operating piece 13b limit operating piece 14 limit switch 14a switch piece a helical gear b spindle

Claims (2)

[Claims] 1. An operating crank that rotates in association with movement of a helical gear provided in the middle of a power transmission mechanism in the axial direction is provided, and one end side of the rotating shaft is located at the center of rotation of the operating crank. A limit switch is provided around the rotating shaft that is fixed and rotates integrally with the rotation of the operating crank, and a limit operating piece that operates the limit switch at a predetermined rotating angle is provided on the rotating shaft. A rotating plate is fixedly mounted on a rotating shaft that is rotatably attached to the case, and an interlocking plate that engages with the rotating plate that is rotated by a predetermined angle in one direction is provided on the rotating shaft so as to freely rotate. A spring that is engaged with the rotating plate and is compressed in the rotating direction of the interlocking plate that rotates in one direction is provided, one end of the spring is supported by the interlocking plate, and the other end of the spring is attached to the main body case. A transmission torque detecting device, characterized in that the transmission torque detecting device is supported at the tip of an adjusting screw screwed so as to be able to move forward and backward. 2. An operating crank that rotates in conjunction with movement of a helical gear provided in the middle of the power transmission mechanism in the axial direction is provided, and one end side of the rotating shaft is located at the center of rotation of the operating crank. A limit switch is provided around the rotating shaft that is fixed and rotates integrally with the rotation of the operating crank, and a limit operating piece that operates the limit switch at a predetermined rotating angle is provided on the rotating shaft. A rotating plate is fixedly mounted on a rotating shaft that is rotatably mounted on the case, and a front interlocking plate that engages with a rotating plate that has been rotated a predetermined angle in one direction and a predetermined angle in the opposite direction And a rear interlocking plate that engages with the rotating plate provided on the rotating shaft so as to be freely rotatable in front of and behind the rotating plate, and engages with the rotating plate to rotate in one direction. A front spring that is compressed in the rotating direction of the interlocking plate is provided, one end of the front spring is supported by the front interlocking plate, and the other end of the front spring is A rear spring that is supported by the tip of a front adjusting screw that is screwed into the main body case so that it can move back and forth and that is compressed in the rotating direction of a rear interlocking plate that engages with the rotating plate and rotates in the opposite direction is provided. The transmission torque detecting device is characterized in that one end of the rear spring is supported by the rear interlocking plate, and the other end of the rear spring is supported by the tip of a rear adjusting screw screwed in the main body case so as to be able to move forward and backward. .