JPS635616B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic spring clutch that utilizes the tightening force of a coil spring to transmit torque, and in particular, it is capable of not only continuous rotation but also rotation of only one rotation or a fraction of a rotation. This invention relates to an electromagnetic spring clutch.

An example of this type of electromagnetic spring clutch is the electromagnetic spring clutch disclosed in Japanese Patent Application Laid-open No. 58-61333.

The conventional electromagnetic spring clutch has an excellent function of not only applying a continuous rotational force to the output rotating member but also being able to apply rotation of only one rotation or a fraction of a rotation to the output rotating member. When used in the paper feed mechanism of a copying machine, etc., if you try to pull out paper with the output rotation member stopped, the paper feed roller, which rotates together with the output rotation member, will Can't rotate.

Therefore, in copying machines and the like that use the conventional electromagnetic spring clutch, if a paper jam occurs in the paper feed roller that rotates together with the output rotating member of the electromagnetic spring clutch, it becomes difficult to remove the paper. There was a problem with that point.

An object of the present invention is to solve the problems in the electromagnetic spring clutch, and a first aspect of the invention is to provide an input rotary member that is concentrically supported on an output rotary member so as to freely rotate, and a A sleeve formed with an annular gap and supported concentrically and freely rotatable, the input rotating member housed in the annular gap and having a winding direction opposite to the rotating direction of the input rotating member, and an output. A field core with a built-in electromagnetic coil disposed on the output rotating member with a predetermined gap between a winding coil spring that has a winding habit on a boss integral with the shaft and one end surface of the sleeve; , an electromagnetic spring clutch comprising a plate-shaped armature for preventing rotation of the sleeve, which can freely tilt in the direction of the sleeve when it is raised by magnetic attraction to the field core and demagnetized; a first sleeve that is rotatably concentrically supported on the output rotating member and the input rotating member; a second sleeve that is rotatably concentrically supported with respect to the first sleeve and is engaged with the armature in a demagnetized state; and one end of a control lever rotatably supported by a shaft whose axial direction is perpendicular to the axis of the first sleeve is formed on the inside of the first sleeve. The second invention is characterized in that one end of the coil spring faces the notch of a required width, and one end of the coil spring is hooked to the first sleeve, and the other end is hooked to the other end of the control lever. , the first invention is the main part of the invention, and the first sleeve and the second sleeve have an over-rotation prevention mechanism in which a protrusion formed on the other sleeve is loosely fitted into a notch formed on one of the sleeves. The feature is that the range of mutual rotation is restricted.

The electromagnetic spring clutch of the present invention will now be described by way of embodiments with reference to the drawings.

FIG. 1 shows a longitudinal side view of the electromagnetic spring clutch of the first invention when the armature is demagnetized. As shown in the drawings, the electromagnetic spring clutch A of the present invention has a tube shaft 1 as an output rotating member.
A field core 2 is concentrically supported at one end.

The field core 2 includes an inner pole member 3, which is shown in a vertical side view in FIG. 2, and a front view in FIG.
The outer pole member 4 shown in the front view in FIG. 5, the outer pole member 4 shown in FIG. It will be done.

A boss 6 is fixed concentrically to the longitudinal center of the tube shaft 1, and a predetermined gap is maintained between the boss 6 and the inner pole member 3 of the field core 2 via a collar 7 serving as a spacer. adjacent to each other.

A boss portion 9 of a chain wheel 8 serving as an input rotating member is brought into contact with the boss 6 that is in contact with the collar 7 on the opposite side of the end surface that is the contact surface with the collar 7.

In addition to the chain wheel, a pulley, gear, etc. may be used as the input rotating member, but in any case, the boss portion 9 is provided regardless of whether it is an integral structure or a joint structure of separate members. do.

The boss 6 has a large diameter part 6A, a small diameter part 6B, and a flange part 6C, and the boss part 9 has a large diameter part 9A.
and a small diameter portion 9B.

The small diameter portion 6B of the boss 6 and the small diameter portion 9B of the boss portion 9 have the same diameter.

Chain wheel 8 as the input rotating member
is supported on the tube shaft 1 via a bearing 10 so as to be freely rotatable, and a sleeve 11 is concentrically supported over the large diameter portion 9A of the boss portion 9 and the large diameter portion 6A of the boss 6 so as to be freely rotatable. be.

The sleeve 11 includes a first sleeve 12 supported on the large diameter portions 9A and 6A so as to freely rotate, and a second sleeve 12 fitted as a concentric support that is immovable in the axial direction and freely rotatable with respect to the first sleeve 12. 2 sleeves 13.

The first sleeve 12 is connected to the boss 6 and the boss portion 9.
An annular gap S is formed between each small diameter portion 6B and 9B.

A notch 12A having a required depth is provided at a predetermined angle on the inside of the first sleeve 12, and a shaft 14 whose axis is perpendicular to the axis of the first sleeve 12 is inserted into this notch. A control lever 15 is rotatably supported.

On the other hand, a coil spring 16 having a winding tendency to tighten around the small diameter portions 6B and 9B of the boss 6 and the boss portion 9 is inserted into the annular gap S.

The control lever 15 has one end facing a notch 17 of a predetermined width formed in the inward flange portion 13A of the second sleeve 13.

Further, the coil spring 16 has one end 16A bent outward in the radial direction hooked into a notch 18 formed in the first sleeve 12, and the other end 16B.
is hooked to the other end of the control lever 15.

A plate-shaped armature 19 is provided between the field core 2 and the sleeve 11.

The armature 19 is shown in a front view in FIG. 7, in FIG. 8 as a sectional view taken along the line of FIG. 7, and as shown in a plan view in FIG. Metal bushings 21 are loosely fitted into these two holes 20, 20, respectively.

The bushes 21 are each fixed to the field core 2 by screws 22.

A large hole 23 through which the collar 7 faces is provided in the center of the armature 19, and a protrusion 24 is formed in the center of the upper end.

The second sleeve 13 is shown in a longitudinal sectional side view in FIG. 10, as shown in FIG. 11 in a view taken along the arrow XI in FIG.
Notches 25 with which 4 engages are provided at diametrically symmetrical positions.

In addition, in this embodiment, since the rotation of the sleeve 11 can be stopped every 1/2 rotation, the notch 25 is arranged in two diametrically symmetrical positions.
However, there are cases where these are provided at three or four locations so that they can be stopped every 120 degrees or 90 degrees.

The width of the notch 17 of the second sleeve 13 is set to be slightly larger than the width of the control lever 15, as shown in the cross-sectional view taken along the line in FIG. 1 in FIG. It is possible to rotate to some extent about the axis 14.

The armature 19 receives a pressing force from two compression coil springs 26 (only one is shown in FIG. 1) which are provided symmetrically on the field core 2 side, and by applying a voltage to the electromagnetic coil 5, the field core 2
The protrusion 24 is magnetically attracted to the front end surface of the notch 25.
When it separates from the body and assumes the upright state, the compression coil spring 26 is compressed.

In addition, the reference numeral 27 in the figure is a mounting plate, which is fixed to the back surface of the outer pole member 4 of the field core 2.
It sticks to the equipment frame, etc. Further, the notch 25 formed in the second sleeve 13 is provided with a guide portion 25A having an inclined surface on the distal end side in the rotational direction of the chain wheel 8 serving as the input rotating member. I've made sure it doesn't fall in.

The electromagnetic spring clutch A of the first invention configured as described above is in the state shown in FIG.
9 is pressed by the compression coil spring 26 and the sleeve 11
The protrusion 24 is recessed into the notch 25 of the second sleeve 13, which is a component of the sleeve 11.

In this state, the second sleeve 13 is prevented from rotating by the armature 19, and the sleeve 11 is also prevented from rotating.
The rotation of the first sleeve 12, which is a constituent member of the first sleeve 12, is prevented from rotating by the second sleeve 13 via a control lever 15.

On the other hand, the tune wheel 8 which is the input rotating member
is located on the tube shaft 1, which is an output rotating member, and is rotated by external power.

At this time, the small diameter part 9B of the boss part 9 of the chain wheel 8 and the small diameter part 6B of the boss 6 fixed to the tube shaft 1
The coil spring 16, which has a winding tendency, cannot rotate because one end 16A is engaged with the notch 18 of the first sleeve 12 and the other end 16B is engaged with the other end of the control lever 15. The small diameter portion 9B of the boss portion 9 is in sliding contact with the small diameter portion 9B. Further, it comes into frictional contact with the small diameter portion 6B of the boss 6 to prevent its rotation.

For example, if the tube shaft 1 is an output rotating member fixed to the shaft 28 of a paper feed roller of a copying machine (shown by a phantom line in FIG. 1), the armature 19 is rotated without applying voltage to the electromagnetic coil 5. When is de-energized, the electromagnetic spring clutch A of the present invention keeps the paper feed roller in a stopped state.

Next, when a voltage is applied to the electromagnetic coil 5 and the armature 19 is magnetically attracted to the field core 2 against the compression coil spring 26, the protrusion 24 is detached from the notch 25 of the second sleeve 13, and the second sleeve The restrictions on 13 will be lifted.

In this state, the force that prevents rotation of the sleeve 11 has been removed, so the first sleeve 12 and the second sleeve 13 that make up the sleeve 11
are rotatable together, and the small diameter portion 9B of the boss portion 9 of the chain wheel 8 which is the input rotating member;
A coil spring 1 tightens both the tube shaft 1, which is an output rotating member, and the small diameter portion 6B of the integrated boss 6.
The tune wheel 8, which is an input rotating member, and the tube shaft 1, which is an output rotating member, are rotated together, and the paper feed roller is rotated.

By the way, by applying a voltage to the electromagnetic coil 5 as a pulse signal, the armature 19 is instantaneously magnetically attracted to the field core 2 and the protrusion 24 is detached from the notch 25 of the second sleeve, and the armature 19 is released at the next moment. It is magnetized and tilted again by the compression coil spring 26, so that the protrusion 24 comes into contact with the end surface of the second sleeve 13.

When the second sleeve 13 is rotated 1/2 in this state, the next notch 25 faces the protrusion 24, and the protrusion 24 engages with the notch, again achieving the torque transmission shown in FIG. However, if the pulse signal for voltage application to the electromagnetic coil 5 is a long pulse, the armature 19 will remain in the upright state for a long time, so as long as the voltage application to the electromagnetic coil 5 continues, the tube shaft 1
continues to rotate, and the paper feed roller is rotated any number of times until the voltage application to the electromagnetic coil 5 is stopped.

The electromagnetic spring clutch A of the present invention, when the voltage application to the electromagnetic coil 5 is stopped,
That is, when the small diameter portion 6B of the boss 6 is being tightened by the tightening force of the coil spring 16, if the paper feed roller is biting the paper, if the paper is pulled out in the feeding direction, The end 16B of the coil spring 16 that tightens the boss 6 is
The control lever 15 is displaced within a permissible range, the tightening force is relaxed, and the paper is allowed to be pulled out.

That is, when an attempt is made to pull out the paper, the boss 6 is rotated, and this force slightly loosens the coil spring 16 whose winding direction is opposite to the rotation direction of the chain wheel 8. Since the control lever 15, which engages the end 16B of the spring 16, rotates, the paper can be pulled out very easily.

The electromagnetic spring clutch B of the second invention is as shown in FIG. 14 as a vertical side view, and as shown in FIG. 15 as a sectional view taken along the line in FIG. The electromagnetic spring clutch A includes a convex portion 29 provided on the first sleeve 12 side to limit the rotational range between the first sleeve 12 and the second sleeve 13 that constitute the sleeve 11;
The only difference is that the over-rotation is suppressed to a predetermined angle by the over-rotation prevention mechanism 31 consisting of the notch 30 of the second sleeve 13 facing this convex portion. The same members and portions as in the electromagnetic spring clutch A are denoted by the same reference numerals, and the structure and operation thereof will be explained using the previous explanation and will not be repeated.

In the electromagnetic spring clutch B of the second invention having the above configuration, when the armature 19 is demagnetized, it is pushed by the compression coil spring 26 and falls toward the second sleeve 13, the protrusion 24 engages with the notch 25, and sudden braking occurs. When the condition is reached, one end of the control lever 15 does not receive an impact within the notch 17 of the second sleeve 13 and transfers its energy to the convex portion 29 and the notch 3.
The excessive rotation prevention mechanism 31 consisting of 0 absorbs the rotation.

As is clear from the above description, the electromagnetic spring clutch of the present invention can stop the output rotating member once or a fraction of a turn, or even every few revolutions, has a uniaxial structure, can be miniaturized, and has an improved torque transmission capability. Of course, it is possible to achieve extremely good responsiveness, but in particular,
Used to transmit torque to the paper feed roller of a copying machine, it has an excellent effect of making it safe and extremely easy to pull out the paper in the unlikely event that the paper gets stuck.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view showing an embodiment of the electromagnetic spring clutch of the first invention, FIGS. 2 and 3 show the inner pole member of the field core, FIG. 2 is a longitudinal sectional side view, and FIG. A front view, FIGS. 4 to 6 show the outer pole member, FIG. 4 is a front view, FIG. 5 is a diagram of FIG. The figure shows the armature, Figure 7 is the front view,
8 is a sectional view taken from FIG. 7, FIG. 9 is a plan view, FIGS. 10 to 12 show the second sleeve, FIG.
12 is a plan view, FIG. 13 is a sectional view taken along the line in FIG. 1, FIG. 14 is a vertical sectional side view showing an embodiment of the electromagnetic spring clutch of the second invention, and FIG. 14 is a sectional view taken along the line in FIG. 14. In the drawings, A... an electromagnetic spring clutch of the first invention;
B... Electromagnetic spring clutch of the second invention, 1
...Tube shaft as an output rotating member, 2... Field core, 3... Inner pole member, 4... Outer pole member, 5...
...Electromagnetic coil, 6...Boss, 6A...Large diameter part, 6
B...Small diameter part, 6C...Flange part, 8...Chain wheel as input rotating member, 9...Boss part, 9A...Large diameter part, 9B...Small diameter part, 11...
Sleeve, 12...first sleeve, 13...second
Sleeve, 14...shaft, 15...control lever, 1
6...Coil spring, 17,18...Notch,
19...armature, 24...protrusion, 25...
... Notch, 26 ... Compression coil spring, 29 ... Convex portion, 30 ... Notch, 31 ... Over-rotation prevention mechanism.

Claims (1)

[Scope of Claims] 1. An input rotating member that is concentrically supported on an output rotating member so as to be freely rotatable, and a sleeve that is concentrically and freely rotatably supported with an annular gap formed between the input rotating member and the input rotating member. , a coil spring for winding that is housed in the annular gap and has a winding habit to a boss integral with the input rotation member and the output rotation member, the winding direction of which is opposite to the rotation direction of the input rotation member; a field core with a built-in electromagnetic coil disposed on the output rotating member with a predetermined gap between the field core and one end surface of the sleeve; and a direction of the sleeve when it is erected and demagnetized by magnetic attraction to the field core. In the electromagnetic spring clutch, the electromagnetic spring clutch has a plate-shaped armature for preventing rotation of the sleeve, and the sleeve is rotatably supported concentrically on the output rotating member and the input rotating member. and a second sleeve which is rotatably supported concentrically with respect to the first sleeve and engages with the armature in a demagnetized state. One end of the control lever rotatably supported by a shaft whose axial direction is perpendicular to the axis of the sleeve is faced into a notch of a required width formed in the second sleeve, and one end of the coil spring is An electromagnetic spring clutch characterized in that the first sleeve is hooked to the other end of the control lever. 2. An input rotating member supported concentrically on the output rotating member so as to be freely rotatable; an annular gap formed between the input rotating member; and a sleeve supported concentrically and freely rotatably within the annular gap; a coil spring for winding, which has a winding tendency to be wound onto a boss integral with the input rotation member and the output rotation member, and whose winding direction is opposite to the rotation direction of the input rotation member; A field core with a built-in electromagnetic coil is arranged on the output rotating member with a predetermined gap between it and the side end surface, and the field core is magnetically attracted to the field core so that it can stand up and tilt in the direction of the sleeve when demagnetized. an electromagnetic spring clutch comprising: a plate-like armature for preventing rotation of the sleeve; A second sleeve is rotatably supported concentrically with respect to the sleeve, and the armature in a demagnetized state is engaged with the second sleeve. One end of the control lever, which is rotatably supported by a shaft whose axis is in the direction of and the other end of the control lever is hooked to the other end of the control lever, and the first sleeve and the second sleeve have a protrusion formed on the other movably facing into a notch formed on one of the sleeves. An electromagnetic spring clutch characterized in that the range of mutual rotation is restricted by an over-rotation prevention mechanism.