JPH10167580A - Sensing device for difference in revolving speed between two shafts and reel to sense fastening amount in winding spiral spring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device to sense the difference in the revolving speed between two shafts and provide a reel to sense the wind-up amount of a spiral spring using the device. SOLUTION: The invention is composed of a sensor shaft 1 and sensor plate 2, which are provided with threads in their centers, and the sensor plate moves to the left and right when the sensor shaft or sensor plate is rotated, and the position of the plate in left-right motions is sensed to serve determination of the difference in the revolving speed between the sensor shaft and sensor plate. This is applied to a reel consisting of a combination of spiral spring and motor, and thereby the wind-up amount of the spiral spring can be sensed to enable adjustment of the torque.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel for winding a cable, a hose, a wire or the like (hereinafter referred to as a cable for convenience).

[0002]

2. Description of the Related Art Conventional reels include a reel using any of a mainspring, an electric motor, and a hydraulic motor, and a reel combining a mainspring and a motor.

[0003]

The output torque of a reel having a combination of a mainspring and a motor varies according to the amount of tightening of the mainspring. In order to know the amount of tightening,
It is necessary to detect the difference between the number of rotations of the drum shaft connected to the inner peripheral portion of the mainspring spring and the spring case connected to the outer peripheral portion, but there is no simple method for detecting the difference.

An object of the present invention is to provide a device for detecting a difference between the rotation speeds of two shafts and a reel for detecting the amount of tightening of a mainspring by the device.

[0005]

As shown in FIG. 1, a sensor shaft is rotatably mounted on a sensor stand. A main plate and an auxiliary plate are rotatably mounted on the sensor shaft.
A screw is cut between the main plate and the auxiliary plate of the sensor shaft. A sensor plate with a thread at the center is mounted between the main plate and the auxiliary plate. A link rod is passed between the main plate and the auxiliary plate, and passes through a hole near the outer periphery of the sensor plate. When the main plate rotates, the link bar transmits the rotation to the sensor plate, and the sensor plate rotates. Since the sensor plate is threaded at the center, it moves left and right when rotated. Conversely, the sensor plate does not rotate, and the sensor plate moves left and right even when the sensor shaft rotates. A shaft gear is attached to the sensor shaft, and a plate gear is attached to the main plate. The gear is connected to the gear A of the shaft A and the gear B of the shaft B by a chain. When the axis A rotates, the sensor axis rotates, and the sensor plate moves left and right. When the axis B rotates, the sensor plate rotates and moves left and right. Since the position of the sensor plate moves due to the difference between the rotation speeds of the shafts A and B, if this is detected, the difference between the rotation speeds of the shafts A and B can be determined.

[0006] Instead of a chain, a belt, a gear, or the like may be used for the rotation transmission of the sensor shaft and main plate and the shafts A and B.

As shown in FIG. 2, the shaft A is replaced by a drum shaft connected to the center of the mainspring of a reel in which the mainspring is combined with a motor, and a motor connected to the outer periphery of the mainspring via a spring case. If the shaft is replaced with the shaft B, the amount of tightening of the mainspring can be detected. The same applies when the drum shaft is replaced with the shaft B and the motor shaft is replaced with the shaft A.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiment shown in FIG. 2 is an example in which the device for detecting the difference between the rotation speeds of two shafts of the present invention is applied to a reel combining a mainspring and a motor. A spring case containing a mainspring is attached to the motor shaft so that when the motor shaft rotates, the spring case rotates. The mainspring has an outer peripheral portion fixed to a spring case and a central portion fixed to a drum shaft. The drum and the drum shaft are fixed, and the drum shaft is rotatably supported by the stand.

The shaft gear of the sensor shaft and the drum gear of the drum shaft are connected by a chain. Similarly, the main plate gear of the main plate and the motor gear of the motor shaft are connected by a chain. Arrange the limit switches parallel to the sensor axis. The sensor plate moves left and right due to the difference in the number of rotations between the drum shaft and the motor shaft. When the sensor plate comes into contact with the limit switch, the limit switch is turned on and off, and the position of the sensor plate can be detected, whereby the difference between the rotation speeds of the drum shaft and the motor shaft can be detected. When the cable is pulled out, the drum rotates clockwise and the spring is inserted so that the spring is tight. When the cable is pulled out, the drum shaft and the sensor shaft rotate clockwise, and the sensor plate moves to the right. When the sensor plate moves to the position of the limit switch on the auxiliary plate side, the motor rotates rightward, the main plate and the sensor plate rotate rightward, and the sensor plate moves to the left. When the sensor plate moves to the middle limit switch position and returns, the motor stops. As a result, the torque applied to the drum by the loosening of the spring becomes substantially constant. Conversely, when the cable is wound up, the drum rotates to the left and the mainspring spring loosens. At this time, since the sensor shaft also rotates counterclockwise, the sensor plate moves to the left. When the sensor plate moves to the limit switch position on the main plate side,
The motor rotates left and the sensor plate moves to the right. At this time, the spring is tightened. When the sensor plate moves to the position of the middle limit switch and returns, the motor stops. Thereby, the torque applied to the drum becomes substantially constant.

If the interval and the number of the limit switches are increased or decreased, and the timing of stopping the rotation of the motor and the combination of the rotation directions are changed, complicated control such as changing the torque halfway can be performed.

[0011]

According to the apparatus of the present invention, the difference between the rotation speeds of two shafts can be detected. By using this for a reel in which a mainspring and a motor are combined, the amount of tightening of the mainspring can be detected and the torque can be adjusted.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the present invention.

FIG. 2 is a side view (cross-sectional view) showing an embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 sensor shaft 2 sensor plate 3 main plate 4 sub plate 5 link rod 6 sensor stand 7 shaft gear 8 main plate gear 9 axis A, drum shaft 10 shaft B, motor shaft 11 gear A, drum gear 12 gear B, motor gear 13 chain A , Drum chain 14 chain B, motor chain 15 limit switch 16 drum 17 mainspring 18 spring case 19 motor 20 reel stand

Claims (1)

[Claims] 1. A sensor shaft and a sensor plate, wherein a screw is cut at the center of the sensor shaft and the sensor plate, and the sensor plate is moved left and right by rotating the sensor shaft or the sensor plate, and the position is detected. Accordingly, a device capable of detecting a difference between the number of rotations of a sensor shaft and a sensor plate, and a reel that detects the amount of tightening of a mainspring using the device.