JPS6122188B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power auxiliary device in which a large operating force can be obtained with a small operating force in an operating device.

In an operating device, it is desirable to be able to obtain a large operating force with a small operating force. For example, there are known devices that can supplement power by using air pressure, hydraulic pressure, etc. This has the disadvantage that it is essential to provide a pressure source, which increases the burden on equipment. On the other hand, as a mechanical power auxiliary device, for example, in Utility Model Publication No. 45-16937, a pin installed upright on a disk-shaped crank fixed on a certain shaft was connected to a longitudinal pin fixed on another shaft. A spring clutch mechanism is provided on the shaft to which the crank is fixed, and the driving plate is driven to a predetermined state using the rotational force of the crank as a power source (rocking). ), the rotation of the crank is interrupted by a clutch mechanism, the drive plate is held in the driven state, and the rotational force of the crank is used to return the drive plate to its original state. However, in this device, a clutch mechanism was provided to hold the drive plate in the state after being driven, which resulted in a complicated structure and an extremely large number of parts.

Against this background, the present invention has been made with the object of providing a power auxiliary device for an operating device that is equipped with an operating member that is operated to operate an operating member, and that has a simple structure and is inexpensive. The power auxiliary device according to the present invention includes (a) a first groove cam 7a that is always rotated around the center line of one rotation and that has a spiral shape on the circumferential surface;
a, 22b, and a second grooved cam 7b; 23a, 23b formed continuously to the first grooved cam and located in a plane orthogonal to the rotation center line; , (b) a contact 11c; 16c capable of engaging with the first and second grooved cams, and (c) the contact 11c; 16c being arranged in a direction substantially radial of the cam body and parallel to the rotation center line. a movable body 9; 16 movably held; (d) the movable body and the actuating member;
(e) a first coupling mechanism 15, 29, 30a that connects the contactor in a direction parallel to the rotational center line to the actuating member; (f) a first biasing means 12; 12' that applies a biasing force in a direction away from the movable body and the operating member; The movable body moves against the biasing force of the contact element and engages the grooved cam, while the contact element is moved by the biasing force of the first biasing means based on the operation of the operating member in the opposite direction. (g) a second connecting mechanism 13, 14, 14a, 17 that connects the contact so that the contact is detached from the grooved cam, and (g) the contact is connected to the moving body from the second grooved cam side to the first groove The second urging means 30a applies a biasing force toward the cam.

In the operating device equipped with this power auxiliary device, when the operating member is operated in one direction, the movable body moves against the urging force of the first urging means, and the contactor moves against the urging force of the first urging means. Engages with the groove cam. Since the cam body is constantly rotated and the first grooved cam is formed in a spiral shape, the contactor engaged with the first grooved cam moves in a direction almost parallel to the rotation center line of the cam body. I am made to do so. This movement is then transmitted to the actuating member by the first coupling mechanism, and the actuating member is actuated by a force based on the rotational power of the cam body. Then, when the contact comes to engage with the second grooved cam,
Since the first grooved cam is formed in a plane perpendicular to the rotation center line of the cam body, the contactor remains stationary regardless of the rotation of the cam body, and the operating member operates as described above. held in the later position.

On the other hand, if the operating member is operated in a direction opposite to the above-mentioned direction, the moving body is moved by the urging force of the first urging means, and the contactor is separated from the second grooved cam. In the movable body, the second biasing means applies a biasing force to the contact in a direction from the second grooved cam side to the first grooved cam side, so that the contactor does not move away from the second grooved cam. When it is detached, it moves toward the first grooved cam, and this movement is transmitted to the actuating member by the first coupling mechanism, and the actuating member returns to its original position.

As is clear from the above explanation, if a relatively small operating force that can resist the biasing force of the first biasing means is applied to the operating member, the operating member will be operated with a large force based on the rotational power of the cam body. It is then held in that position by engagement between the contact and the second grooved cam.

Hereinafter, a case in which the present invention is applied to an operating device for raising and lowering a presser foot of a sewing machine will be described in detail as an example.

As shown in FIGS. 1 and 2, three horizontal shafts 2, 3, and 4 are arranged parallel to each other in a case 1 provided below the table of the sewing machine.
In the middle of the first horizontal shaft 2, both ends of which are rotatably supported by bearings 5a and 5b, there is a cylindrical column which is rotated counterclockwise in FIG. 2 around this shaft 2 by a drive device. The cam body 6 is fixed. As shown in FIG. 3, on the circumferential surface of the cam body 6, following a relatively shallow spiral first groove cam 7a (approximately one and a half turns in this example), there is a second groove cam deeper than this. (Latching groove) 7b is formed to be perpendicular to the axis of shaft 2.

A movable body 9 is attached to the middle portion of the second horizontal shaft 3, which has both ends fixed to the case 1. The movable body 9 includes a first swinging member 10 that is loosely fitted onto the shaft 3 and is rotatable around the shaft 3, but is restricted from both sides by fixed members 8a and 8b and cannot be moved in the axial direction of the shaft 3. and a second swinging member (lever) 11 whose one end is pivotally connected to a flat part formed on the swinging member 10 following the protrusion 10a by a pin 11a in a direction perpendicular to the shaft 3. It is completed.

A protrusion 11b is provided at the end of the lever 11 that is pivotally connected to the pin 11a, and when the lever 11 is rotated slightly clockwise from an upright position, the protrusion 11b of the swinging member 10 is erected. The stopper pin 10b is brought into contact with the stopper pin 10b. Therefore, the projection 11b of the lever 11 is connected to the stopper pin 10.
It can be rotated only in the counterclockwise direction from the position where it is brought into contact with b. On the side surface of the free end of the lever 11 facing the cam body 6, there is a pin-shaped contact 1 that is engaged in the groove cam 7a and the locking groove 7b of the cam body 6.
1c is erected. This contactor 11c is engaged with the grooved cam 7a slightly above the axis of the cam body 6 when the lever 11 is in an upright state, and when the lever 11 is rotated, the grooved cam 7a and the locking groove are engaged with each other. The length is selected to such an extent that the lever 11 does not come into contact with the outer peripheral surface of the cam body 6 even when engaged with any part of the cam body 7b. The free end of the lever 11 is also biased by a spring 12 substantially perpendicular to the shaft 2 in a direction in which the contact 11c is separated from the cam body 6. The spring 12 constitutes the first biasing means.

A presser foot 30 shown in FIG. 4 is connected to the intermediate portion of the lever 11. As shown in FIG. A connecting rod 15 is connected to the intermediate portion of the lever 11 by a spherical joint and extends substantially parallel to the rotation center line of the cam body, and its movement to the left in FIG. The movement is converted into a vertical movement by the included movement direction conversion mechanism, and converted into an upward movement of the elevating member 29 shown in FIG. As a result, the presser foot 30 connected to the spring 30a is raised. In this embodiment, the connecting rod 15, a motion direction changing mechanism (not shown), the elevating member 29, the spring 30a, etc. constitute a first connecting mechanism. Also, the spring 30a
The elastic force is transmitted to the lever 11 via the elevating member 29, the motion direction changing mechanism, and the connecting rod 15, thereby urging the contact 11c from the locking groove 7b side toward the groove cam 7a side. , spring 3
0a constitutes the second urging means.

A protrusion 10a of a swinging member 10 is located on the third horizontal shaft 4, which is rotatably supported at both ends by the case 1 in the same way as the first horizontal shaft 2, at a position facing the movable body 9. Another swinging member 13 having a protrusion 13a brought into contact is fixed. Also this axis 4
A lever 14 is fixed to one end projecting outside the case 1, and this lever 14 is connected to a pedal 31 as an operating member by a chain 14a. This chain 14a is constantly pulled downward by the weight of the pedal 31, etc., and thereby the shaft 4
The protrusion 13a of the swinging member 13 fixed on the shaft 3
The protrusion 1 of the swinging member 10 is rotatably fitted loosely on the top.
It is actively brought into contact with 0a. That is, in this embodiment, the chain 14a, lever 14, swinging member 13, etc. constitute a second connection mechanism.

Next, the operation will be explained.

Initially, when the foot pedal is not depressed at all, the protrusion 11b of the lever 11 is in contact with the stopper pin 10b, and the position A in FIG.
As shown in FIG. 6, the lever 11 is in a position where the contact 11c can engage with the vicinity of the right end of the grooved cam 7a of the cam body 6, but it has not yet been engaged.
As shown by A', it is slightly spaced apart from the outer peripheral surface of the cam body 6.

When the pedal is depressed from this state and the chain 14a is pulled downward, the lever 14 is rotated clockwise together with the shaft 4, and the swinging member 13 fixed on the shaft 4 is also rotated in the same direction. As a result, the swinging member 10 on the shaft 3 whose protrusion 10a is brought into contact with the protrusion 13a of the swinging member 13 is rotated counterclockwise. Accordingly, the lever 11 is also rotated in the same direction against the elastic force of the spring 12. At this time, the contact 11c remains in contact with the outer peripheral surface of the cam body 6 until the phase matches with the grooved cam 7a, but when the phase matches with the grooved cam 7a, the contact 11c remains in contact with the outer peripheral surface of the cam body 6.
As shown by A'' in the figure, the contact 11c is engaged with the grooved cam 7a.If the pedal is kept depressed after this, the contact 11c will be brought into contact with the grooved cam 7a.
As the cam body 6 rotates, the lever 11 is guided by the grooved cam 7a and moved to the left while being pressed against the bottom surface of the spring 30a that biases the presser foot leg 30 downward. It is rotated counterclockwise around the pin 11a against the elastic force of. That is, lever 11
The contact 11c and the grooved cam 7a are separated from each other by rotating the cam body 6 approximately once from the state shown at A in FIG. After the contact 11c is rotated until it is disengaged from the grooved cam 7,
In FIG. 6, the locking groove 7b is formed deeper than a.
The locking groove 7b is formed in a direction perpendicular to the shaft 2 and deeper than the groove cam 7a, so that even if the cam body 6 is rotated, the lever 11 does not rotate. , the lever 11 is securely held in the state shown by B in FIG.

By thus rotating the lever 11 from the state shown at A to the state shown at B in FIG. 5, the connecting rod 15 is moved to the left in parallel with the shaft 3 by the amount of swing of the pivot point. As a result, the presser foot 30 is raised and held in the raised position, and this state can be maintained for a desired period of time as long as the pedal is not loosened.

In this state, the workpiece cloth W is placed at a predetermined position on the cloth feed plate 30b disposed below the presser foot 30, and then the presser foot 30 is lowered by releasing the pedal. That is, in FIG. 6, the contact 11c of the lever 11 is engaged with the locking groove 7b.
When you release the pedal in the state shown by B'',
Since the swinging member 10 on the shaft 3 is rotated clockwise by the elastic force of the spring 12 provided on the lever 11, the contact 11c of the lever 11 is disengaged from the locking groove 7b and is moved to the sixth position. It is separated from the cam body 6 as indicated by B' in the figure. the result,
The lever 11 is rotated clockwise around the pin 10a by the elastic force of the spring 30a that urges the presser foot leg 30 downward until the protrusion 11b abuts against the stopper pin 10b. The state is returned to the original state shown in This lever 11
Due to the clockwise rotation of the connecting rod 15, the connecting rod 15 is moved to the right in parallel with the shaft 3 by the amount of rotation of the pivot point, so the presser foot leg 30 is lowered, and the work cloth W is moved to the cloth feed plate. 30b. In other words, in this embodiment, the spring 30a that urges the presser foot leg 30 downward holds the movable body 9 in the locking groove 7.
This spring also serves as a means for biasing the grooved cam 7a in the direction from the grooved cam 7a, but this spring may be provided separately.

As is clear from the above explanation, in this embodiment, the pedal depression is for rotating the swinging member 13 fixed on the third horizontal shaft 4 in the clockwise direction. Therefore, since the swinging member 13 is rotated clockwise, the swinging member 10, which is loosely fitted on the second shaft 3 so as to be rotatable only, is rotated counterclockwise. As a result of this rotation, the contact 11c of the lever 11 is engaged with the groove cam 7a of the cam body 6, and as a result, the lever 11 is rotated using the rotational force of the cam body 6 as a power source. Therefore, the connecting rod 15 can be moved by a predetermined amount with great force.

Furthermore, by providing the locking groove 7b on the cam body 6 in addition to the grooved cam 7a for rotating the lever 11, the lever 11 can be can be maintained in the state shown at B in FIG. 5 for a desired period of time. In order to maintain the lever 11 in the rotated state, it is sufficient that the locking groove 7b is formed in a plane perpendicular to the shaft 2, but in this embodiment, the locking groove 7b is further formed in a groove cam. Since the contactor 11c is formed deeper than the locking groove 7a, the contact 11c is once in the locking groove 7b
There is no need to worry about engaging the grooved cam 7a again after falling into the groove.

Furthermore, when releasing the pedal,
The lever 11 can be returned to its original state by loosening the pedal and allowing the contact 11c to deviate from the locking groove 7b, thereby lowering the presser foot 30 and feeding the work cloth. Board 30b
Make sure to press it firmly towards the target.

Another embodiment of the present invention is shown in FIG. 7 (main parts only).

In the embodiment described above, the movable body 9 is composed of a swinging member 10 and a lever 11, and the connecting rod 15 is moved by rotating the lever 11, one end of which is pivotally attached to the swinging member 10. However, in this embodiment, the movable body 16 itself is rotatable around the axis of the shaft 3' and has a support portion 16a that is movable in the axial direction, and the end of the arm portion 16b extending from the support portion 16a is A contact 16c is attached to the cam body 6 so that the contact 16c is approximately at the same height as the axis of the cam body 6.
The end of the arm 16b to which the contact 16c is attached is biased by a spring 12', and the connecting rod 15' is connected to a mechanism for raising and lowering the presser foot leg 30 at the middle of the arm 16b. This is the same as in the previous example.

The rotating member 17 fixed to the third shaft 4'
It is formed to be slightly longer than the movement length of the moving body 16 provided on the shaft 3', and a stopper 17a is provided at the right end, and the end surface of the protrusion 16d of the moving body 16 touches this stopper 17a. By making them touch each other, the rightmost position is restricted.

In this embodiment, when the pedal is depressed and the rotary member 17 is rotated counterclockwise, the contact 16 is erected at the end of the arm 16b.
When the contact 16c is engaged with the grooved cam 7a of the cam body 6 which is constantly rotating, the contact 16c is guided by the grooved cam 7a and moved to the left, and as a result, the movable body 1
6 is moved in the axial direction of the shaft 3', thereby moving the connecting rod 15' to the left by a predetermined amount. In this way, the contact 16c is attached to the arm 16b of the moving body 16,
The same objective as in the embodiment described above can also be achieved by moving the movable body 16 itself in the axial direction.

In all of the above examples, the power auxiliary device according to the present invention is applied to an operating device for raising and lowering the presser foot of a sewing machine, but the present invention is not limited to each of the above examples, and can be applied to In addition to being widely applicable to many operating devices that are desired to obtain a large operating force, each element constituting the device can be changed or modified without departing from the spirit of the present invention described above.

For example, in each of the above embodiments, the contactor 11c,
The movements of the movable bodies 9 and 16 holding the 16c have been described as a combination of rotation and rotation and a combination of rotation and linear movement, respectively, but this may also be a combination of linear movement and linear movement. Of course, this is possible, and the point is that it is sufficient to hold the contact so that it can move substantially in the radial direction of the cam body and in the direction parallel to the rotation center line.

Further, when it is desired to operate the mechanism for raising and lowering the presser foot in stages, the cam body 20 is divided into two cam bodies 21a and 21a having different diameters, as shown in FIG.
21b, each cam body has a spiral groove cam 2.
2a, 22b and the locking grooves 23a, 23b are formed so that the groove cams become gradually deeper as they proceed to the left, and if the pedal is depressed in two steps, the part where the contact of the movable body is held can be moved in the axial direction of the cam body 20 in two steps.

Furthermore, if a spring is installed in the middle of the chain connected to the pedal, it becomes possible to depress the pedal to its full stroke regardless of the state of engagement between the contact and the grooved cam. Due to the elastic force of the cam body, as the cam body rotates, it is engaged with the deeper grooved cam on the left side, and also has the effect of preventing damage to the device due to excessive pedal force.

As described in detail above, the present invention utilizes the rotational force of the cam body as a power source, so that by simply moving the movable body with a small force, the portion of the movable body where the contactor is held can be moved by a large force. The movable body can be moved in the axial direction of the cam body, and by providing the cam body with a second groove cam in the direction perpendicular to the rotation center line, the part of the movable body where the contact is held is securely held. The movable body can be held in the state after being moved, and the movable body can be returned to its original state at a desired time by displacing the contact from the second groove cam. It can be suitably used as a power assisting means with a simple structure in an operating device.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view showing an example in which the power auxiliary device according to the present invention is applied to a sewing machine, Fig. 2 is a cross-sectional view in Fig. 1, Fig. 3 is a perspective view showing the shape of the cam body, and Fig. 4 The figure is a perspective view showing the shape of the presser foot, FIGS. 5 and 6 are explanatory views for explaining the operation of the embodiment shown in FIG. 1, and FIGS. FIG. 2 is a perspective view and a front view showing an embodiment of the invention. 1...Case, 2, 3, 3', 4, 4'...Shaft, 5
a, 5b... Bearing, 6, 20... Cam body, 7a, 22
a, 22b... Groove cam, 7b, 23a, 23b... Locking groove, 8a, 8b... Fixed member, 9, 16... Moving body, 10, 13, 17... Swinging member, 10a, 13
a... Projection, 10b... Stopper pin, 11a... Pin, 11b... Projection, 11c, 16c... Contact, 1
2, 12', 30a... Spring, 14... Lever, 14a... Chain, 15, 15'... Connecting rod, 16a
...Support part, 16b...Arm part, 17a...Stopper, 2
9... Lifting member, 30... Cloth presser leg, 30b... Cloth feed plate, 31... Pedal.

Claims (1)

[Scope of Claims] 1. A power auxiliary device that is installed in an operating device equipped with an operating member 31 that is operated to operate an operating member 30 and that operates the operating member with a force greater than the operating force applied to the operating member. a first grooved cam 7a which is always rotated around the center line of one rotation and has at least a spiral shape on the circumferential surface;
22a, 22b; and a second grooved cam 7b; 23a, 23b formed continuously to the first grooved cam and located in a plane orthogonal to the rotation center line; , a contact element 11c; 16c capable of engaging with the first and second grooved cams, and movement for holding the contact element movably in a substantially radial direction of the cam body and in a direction parallel to the rotation center line. body 9; 16, and a first coupling mechanism 15; 29, which connects the movable body and the actuating member so as to be able to transmit movement of the contactor in a direction parallel to the rotation center line to the actuating member;
30a, a first biasing means 1 that applies a biasing force to the movable body in a direction in which the contact moves away from the cam body;
2; 12', and the movable body and the operating member are moved so that the movable body moves against the biasing force of the first biasing means based on the operation of the operating member in one direction, and the contactor is moved. a second coupling mechanism 13 that engages with the grooved cam and connects the contact so that it is detached from the grooved cam by the urging force of the first urging means based on the operation of the operating member in the opposite direction; , 14, 14a; 17
and a second biasing means 30a that applies a biasing force to the movable body in a direction in which the contactor is directed from the second grooved cam side to the first grooved cam side. Power auxiliary equipment in equipment. 2. A first rocking body 10 in which the movable body 9 is rotatable around an axis parallel to the rotation center line of the cam body 6;
and a second rocking body 1 rotatably attached to the first rocking body about an axis perpendicular to the axis.
1. The power auxiliary device according to claim 1, wherein the contactor 11c is attached to a free end of the second rocking body. 3. The movable body 16 has a support portion 16a supported rotatably around an axis parallel to the rotation center line of the cam body 6 and movable in the direction of the axis, and an arm extending from the support portion. The power auxiliary device according to claim 1, wherein the contactor 16c is attached to the portion 16b. 4 Second groove cam 7b of the cam body 6; 20; 2
3a, 23b are the first grooved cams 7a; 22a, 22
The power auxiliary device according to any one of claims 1 to 3, wherein the power auxiliary device is formed deeper than the depth b.