JPS6338723A - Spring clutch - Google Patents

Abstract

PURPOSE:To easily adjust a angle of a driven substance when rotation is stopped by providing a plurality of engaging parts where one end of a coil spring is selectively engaged with a ratchet. CONSTITUTION:On the other end side edge of a shaft 1 is fixed a clutch hub 4 by means of a pin 5. The cut edge part 10 of a coil spring 6 which is externally fitted on the boss 2 of a driving pulley 3 and the boss 21 of a clutch hub 4 is fitted into the grooved part 12 of the clutch hub 4. Onto the coil spring 6 is externally fitted a ratchet 22. At a position in the neighborhood of the ratchet and the like is provided an electromagnet, and the pointed end of an armature 25, as a moving part, is engaged with a raised part 7 provided on the peripheral surface of the ratchet 22 in such a manner that it is engaged and disengaged freely. By way of an adjusting method that the engaging part, with which one end 9 of the coil spring 6 is engaged, is varied, the adjustment of the angle of a driven substance, when rotation is stopped, can be made easily. Moreover, a deviation in the angle of a driven substance subsequent to the adjustment can be prevented from taking place, and a stable function can also be exercised.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a spring clutch.

Conventional technology Conventionally, automatic paper feed devices of copying machines have used spring clutches that rotate paper feed rollers at predetermined timings. A half-moon-shaped roller with a flat surface formed on a part of the outer periphery is used. Here, when a half-moon roller is used, it is necessary to maintain the flat surface parallel to the paper when the half-moon roller stops rotating.

The precision with which the flat surface faces the paper in parallel when the rotation of the half-moon roller is stopped depends largely on the dimensional precision of the coil spring used in the spring clutch. However, it is very difficult to adjust the angle of the semicircular roller when the rotation is stopped by increasing the dimensional accuracy of the coil spring. Therefore, in order to maintain the flat surface of the semicircular roller parallel to the paper when the rotation is stopped, a spring clutch equipped with an fA node mechanism as shown in FIGS. 5 and 6 is provided.

First, the spring clutch shown in FIG. 5 will be explained. A drive pulley 3 having a boss 2 integrally formed thereon is fitted onto the shaft 1, and a clutch hub 4 is fixed to the end of the shaft 1 by a pin 5. A coil spring 6 is fitted onto the outer periphery of the boss 2 in a press-contact state, and a cylindrical ratchet 8 having a protrusion 7 integrally formed thereon is fitted onto the outer periphery of the coil spring 6. Cut-and-raised portions 9 and 10 are formed at both ends of the coil spring 6, respectively, one cut-and-raised portion 9 is engaged with a groove portion 11 formed in the ratchet 8, and the other cut-and-raised portion 10 is engaged with a groove portion 11 formed in the ratchet 8. It is engaged with a groove 12 formed in the hub 4. Next, a semicircular roller 13 is fastened to the shaft 1 by a screw 14 so as to be rotatably adjustable around the axis of the shaft 1. Therefore, when the rotation of the semicircular roller 13 is stopped, the flat surface 15 of the semicircular roller 13 can be adjusted to face parallel to the paper (not shown) by loosening the screw 14 and moving the semicircular roller 13 along the axis of the shaft 1. This is done by rotating it around the center and tightening the screw 14 again.

Next, the spring clutch shown in FIG. 6 will be explained. Incidentally, the same parts as those explained in FIG. 5 are indicated by the same reference numerals, and the explanation will be omitted.

The half-moon roller 16 is fixed to the shaft 1, and the clutch hub 17 is fixed by a screw 18 so as to be rotatably adjustable around the axis of the shaft 1.

Therefore, when the rotation of the semicircular roller 16 is stopped, the flat surface 15 of the semicircular roller 16 can be adjusted to face parallel to the paper (not shown) by loosening the screws 1-8 and moving the clutch hub 17 to the shaft 1. This is done by rotating it around the axis and tightening the screw 18 again.

Problems to be Solved by the Invention Conventionally, the adjustment involves loosening the screws 14, 18 and adjusting the half-moon roller 1.
3 or the clutch hub 17 is rotated around the axis of the shaft 1 and the screws 14 and 18 are tightened again.
Adjustment is difficult and time consuming. Also, screw 14
．． The half-moon roller 13 and the clutch hub 17 tend to become misaligned due to the loosening of the clutch 18, which has the disadvantage that adjustments must be made frequently.

Means for solving the problem: A driven body is fixed to one end of the shaft, and a clutch hub is attached to the other end of the shaft, which rotates integrally with the shaft. and a rotatable drive body.

A coil spring is fitted onto the outer periphery of the drive body in a press-contact state, and a ratchet having a protrusion that engages with the movable part of the electromagnet is fitted onto the coil spring. A plurality of engaging portions are provided along the circumferential direction of the ratchet with which one end of the coil spring is selectively engaged, and the other end of the coil spring is engaged with the clutch hub.

By selecting the engaging portion of the ratchet with which one end of the working coil spring engages, the rotation angle of the driven body when rotation is stopped is adjusted, and this angle adjustment can be performed reliably and easily.

Embodiment An embodiment of the present invention will be explained based on FIGS. 1 to 4. Incidentally, the same parts as those explained in FIGS. 5 and 6 are indicated by the same reference numerals, and the description thereof will be omitted. A semicircular roller 19, which is a driven member, is fixed to one end of the shaft 1. A belt 20 is wound around a drive pulley 3, which is a drive body, fitted on the other end of the shaft 1 so as to be rotatable around the axis of the shaft 1, and between the drive pulley 3 and a drive part (not shown). Further, a clutch hub 4 is fixed to the other end of the shaft 1 by a pin 5.

The cut-out portion 10 of the coil spring 6 which is fitted onto the boss 2 of the drive pulley 3 and the boss 21 of the clutch hub 4 is engaged with a groove portion 12 which is an engagement portion formed on the clutch hub 4. A cylindrical ratchet 22 is fitted around the coil spring 6, and a plurality of grooves 23, which are engagement parts, are formed along the circumferential direction at the end of the ratchet 22 on the drive pulley 3 side. And coil spring 6
The cut-and-raised portion 9 is selectively engaged with one of the groove portions 23.

An electromagnet 24 is provided in a position close to the ratchet 22 and the like, and the tip of an armature 25, which is a movable part provided on the electromagnet 24, engages and disengages from a protrusion 7 formed on the outer peripheral surface of the ratchet 21. freely engaged.

Also, a paper 26 is provided below the semicircular roller 19.
A paper feed cassette 27 containing .

In such a configuration, the drive pulley 3 constantly rotates around the axis of the shaft 1 due to power transmission via the belt 20. The coil spring 6 and the raised portion 9 fitted onto the boss 2 in a press-contact state urge the engaged ratchet 22 to rotate in the same direction. Here, when the tip of the armature 25 is engaged with the protrusion 7 as shown in FIG. 4, the rotation of the coil spring 6 and ratchet 22 is prevented, and the shaft 1. The semicircular roller 19 is maintained in a non-rotating state.

When the armature 25 is attracted by energizing the electromagnet 24 and disengaged from the protrusion 7, the coil spring 6, ratchet 22. Shaft 1. The semicircular roller 19 rotates integrally around the axis of the shaft 1. The energization of the electromagnet 25 is instantaneous, and after the ratchet 22 and the like have made one revolution, the tip of the armature 25 is again engaged with the protrusion 7, and the rotation of the half-moon roller 19 and the like is stopped. Note that the paper 26 in the paper feed cassette 27 is fed during one rotation of the semicircular roller 19.

Here, when the rotation of the semicircular roller 19 is stopped, the flat surface 15 needs to face the paper 26 in parallel so as not to interfere with the attachment and detachment of the paper feed cassette 27. The angle of the half-moon roller 19 when the rotation is stopped is adjusted by changing the groove 23 with which the raised portion 9 engages.

therefore.

The angle of the half-moon roller 19 can be easily adjusted, and furthermore, the angle of the half-moon roller 19 is prevented from shifting after the adjustment.

Effects of the Invention The present invention provides a ratchet with a plurality of engaging portions along the circumferential direction of the ratchet with which one end of the coil spring is selectively engaged. The angle of the driven body when the rotation is stopped can be easily adjusted by changing the engaging part that engages, and it also prevents the angle of the driven body from shifting after adjustment, resulting in stable functionality. It has the effect of being able to demonstrate

[Brief Description of the Drawings] Fig. 1 is an exploded perspective view showing an embodiment of the present invention, Fig. 2 is a longitudinal sectional front view in an assembled state, Fig. 3 is a perspective view showing a state in use, and Fig. 4 is a perspective view showing an embodiment of the present invention. Its side view, FIG. 5 is an exploded perspective view showing a conventional example, and FIG. 6 is an exploded perspective view showing another conventional example. 1... Shaft, 3... Drive pulley (driver), 4
...Clutch hub, 6...Coil spring, 7.
・Protrusion, 19 ・Half-moon roller (driven body), 2
2... Ratchet, 23... Groove portion (engaging portion), 24
...Electromagnet, 25...Amateur (movable part) Applicant: Tokyo Electric Co., Ltd. Representative: Akira Aiki'[1'1□Pa■Tomoe,,:;L2:'j:++7.1 J Figure 7 Ichiatsu Figure 5 (Team 1l) Figure 36 (Defeated)

Claims (1)

[Claims] A clutch hub that rotates integrally with the shaft and a drive body rotatable around the axis of the shaft by driving force from a drive unit are provided on the other end side of the shaft to which the driven body is fixed on one end side, A coil spring is fitted around the outer periphery of the driving body in a press-contact state, and a ratchet is fitted around the outer periphery of the coil spring, and one end of the coil spring is engaged with the ratchet, and the other end of the coil spring is In the spring clutch, the spring clutch transmits rotational force from the driving body to the driven body by engaging an end of the clutch hub with the clutch hub and disengaging the protrusion of the ratchet from the movable part of the electromagnet. A spring clutch characterized in that a ratchet is provided with a plurality of engaging portions along the circumferential direction of the ratchet, with which one end of the coil spring is selectively engaged.