JP2512111Y2 - Air valve switching device - Google Patents

Description

[Detailed description of the device]

[0001]

INDUSTRIAL APPLICABILITY In the present invention, for example, a guide plate attached to a sewing machine so as to correctly feed a belt-shaped sewing product to a needle drop position can be moved between an operating position and a non-operating position by advancing and retracting an air cylinder. The present invention relates to an air valve switching device used for switching between feeding and non-feeding of operating air to the air cylinder in the band-shaped sewn material guide device.

[0002]

2. Description of the Related Art In a sewing machine for sewing such as hemming, rubber putting, and spun knitting of rubber, it is necessary to correctly align the sewing material and the belt-shaped rubber to be sewn on the sewing material and send it to the needle drop position. In order to facilitate this feeding, a guide plate that guides one side edge of the strip-shaped rubber along the side edge is provided on the sewing machine bed in front of the needle drop position.

However, when the guide plate is fixed to the sewing machine bed, for example, when inserting a band-shaped rubber into the peripheral edge of the mouth of the sewing material, such as inserting rubber in the waist of the brief, the needle drop at the end of sewing. There is an inconvenience that the sewing start portion returning to the front of the position interferes with the guide plate and interferes with the sewing. Therefore, conventionally, the guide plate can be moved by utilizing the forward / backward movement of the air cylinder, and the working position is aligned with the feeding path of the belt-shaped rubber to perform the above-described guiding action, and the guiding position is deviated from the feeding path. A guide device for a belt-shaped sewn product has been put into practical use, which enables the position to be changed between the non-acting position and the above-mentioned inconvenience.

FIG. 1 is a perspective view showing a main part of a sewing machine equipped with this type of guide device. As shown, this guiding device 3
Supports a movable rod 31 slidably in the extending direction of the sewing machine bed B on a substrate 30 mounted along the front part of the sewing machine bed B, and the base end of the movable rod 31 is placed on the substrate 30. A guide plate 33, which is connected to the tip of the output rod of the air cylinder 32 which is fixedly mounted on the movable rod 31, is fixed to the tip of the movable rod 31 via a mounting bracket 34. On one side of the movable rod 31, a guide rod 35 fitted into a support plate 36 common to the movable rod 31 is arranged in parallel with each other, and the tip of the guide rod 35 is attached to the above-mentioned mounting. It is fixed to the bracket 34, and a stopper ring 37 is also fitted in the middle part.

The guide plate 33 is a thin slide plate 33a which is aligned with the surface of the sewing machine bed B in front of the needle drop position.
And a ruler plate 33b laminated on a half portion of the upper surface of the sewing machine bed B according to the sliding movement of the movable rod 31 caused by the advancing and retracting movement of the air cylinder 32.
That is, it moves along the surface of the sewing machine bed B in the direction orthogonal to the feeding direction of the belt-shaped rubber R.

Air cylinder 32 during normal sewing work
Is in a retracted state, and the guide plate 33 is positioned at the illustrated working position. At this time, the strip-shaped rubber R to be guided is fed to the needle drop position while maintaining a proper posture by aligning one side edge of the strip-shaped rubber R with the side edge of the ruler plate 33b. And, the sewing with the sewing cloth C superposed thereon can be surely performed.

On the other hand, when the air cylinder 32 moves forward, the sliding of the movable rod 31 associated therewith causes the guide plate to move.
The numeral 33 indicates a non-acting position which is moved in a direction indicated by an outline arrow in the drawing and is separated from the working position by an appropriate length in the extending direction of the sewing machine bed B, that is, a non-deviation from the extension line of the needle drop position. Positioned in the working position. The guide plate 33 in the non-acting position does not hinder the feeding of the sewing material C integrated with the belt-shaped rubber R by stitching, and there is no fear that the sewing work will be hindered at the above-mentioned end of sewing.

The guide rod 35 prevents the movable rod 31 from rotating around the axis due to the above-mentioned sliding and causes the movement path of the guide plate 33 to follow the surface of the sewing machine bed B. Eggplant The stopper ring 37 fitted to the guide rod 35 limits the sliding range of the movable rod 31 associated with the advancing operation of the air cylinder 32 by contact with the support plate 36. Fixed position is movable rod
By appropriately changing the lengthwise direction of 31, the separation length between the operating position and the non-operating position can be appropriately set according to the sewing conditions such as the width of the strip rubber R.

In order to operate the guide device 3 as described above, it is necessary to move the air cylinder 32 back and forth by switching between feeding and non-feeding the operating air. It is performed by operating an air valve interposed between 32 and the air source. Since it is often necessary to use both hands for sewing work, many air valve switching devices have been adopted in which the operation of the air valve can be performed by the operator's knee.

FIG. 2 is a side view of the conventional switching device 4. As shown in FIGS. 1 and 2, in the switching device 4, a swing block 41 is attached to a base 40 fixed to the back surface of the sewing machine table T so as to swing freely around a horizontal axis.
One end of a connecting rod 42 bent into an L shape is fixed to 41, the other side of the connecting rod 42 is extended downward, and a knee pushing plate is provided at the tip of the same side.
43 is fixed, and the air valve 2 is attached to the other side of the bracket 44 whose one side is fixed to the side surface of the swing block 41.

As shown in FIG. 2, in the air valve 2, one end of a switching spool (not shown) incorporated in the housing 20 is projected to one side of a cylindrical housing 20, and an operating force (pushing force) is applied to the projecting portion 21. It is a known valve that is configured to switch the air feed state, specifically, the non-feed state to the feed state, by applying pressure) and moving the switching spool. The housing 20 is connected with a supply / exhaust pipe 22 connected to the air cylinder 32, an air supply pipe 23 connected to an air source (not shown), and an exhaust pipe 24 open to the atmosphere. The air valve 2 is attached to the bracket 44 in such a manner that the protruding portion 21 faces the lower surface of the base 40.

A spiral spring is attached to the pivot portion of the swing block 41.
The rocking block 41 and the bracket 44 fixed to the rocking block 41 are urged by the spring force of the spiral spring 45 and are normally restrained to the rocking position shown in FIG. The protruding portion 21 of the air valve 2 fixed to the bracket 44 faces the lower surface of the base 40 at an appropriate interval. At this time, the switching spool of the air valve 2 is at the moving position where the supply / discharge pipe 22 communicates with the exhaust pipe 24 inside the housing 20, and the operating air inside the air cylinder 32 is discharged to the atmosphere via the exhaust pipe 24. As a result, the air cylinder 32 retracts and the guide plate 33 is positioned at the working position.

On the other hand, when the knee pushing plate 43 is pressed as shown by the hollow arrow in FIG. 2, the rocking block 41 rocks by this manipulating force transmitted through the connecting rod 42, The protrusion 21 of the air valve 2 fixed to the bracket 44 that swings together with the swing block 41 is pressed against the lower surface of the base 40. As a result, the switching spool of the air valve 2 connects the supply / discharge pipe 22 to the supply pipe 23 inside the housing 20.
The air supplied to the air supply pipe 23 is supplied to the air cylinder 32 via the air supply / exhaust pipe 22. As a result, the air cylinder 32 advances and the guide plate 33 moves to the non-operating position. Is moved to and positioned at that position.

That is, in the conventional switching device 4, the switching operation of the air valve 2 is performed in response to the pressing of the knee pushing plate 43 by the knee of the operator seated in front of the sewing machine table T, and the air cylinder 32 associated therewith. By the forward / backward movement of, the position of the guide plate 33 is changed between the non-acting position and the acting position.

[0015]

However, in the conventional structure as described above, after the guide plate 33 is moved to the non-acting position, the pressing of the knee pushing plate 43 is continued in order to hold it in that position. It is necessary to press the knee pushing plate 43 so as to press the protrusion 21 between the housing 20 of the air valve 2 and the switching spool, as well as the urging force of the spiral spring 45 interposed in the pivot portion of the swing block 41. Since it is performed against the urging force of a spring (not shown) provided to maintain the protruding state, the leg is considerably burdened with the continuation of the pressing, and the sewing work is continued for a long time. However, a large number of pressing operations of the knee pressing plate 43 required during this period have a drawback that a great labor burden is imposed on the operator.

In order to solve this difficulty, instead of the mechanical air valve 2 as described above, an electromagnetic air valve which performs a switching operation according to the energization of the drive coil is used, and
A push-type switch is placed at the position where the knee pushing plate 43 is arranged,
A switching device has been put into practical use, which is configured to control the energization of the drive coil in accordance with the on / off state of the switch to switch the supply and non-supply of the operating air to the air cylinder 32.

According to this structure, the operator can guide the guide plate 33.
It suffices to perform only the on / off operation of the switch by the knee in order to change the position of the, and it is possible to significantly reduce the labor load, but to control the energization of the electromagnetic air valve and the drive coil of the air valve. Since expensive auxiliary equipment such as a control box is required, there is a drawback that the equipment cost is increased.

The present invention has been made in view of the above circumstances, and an air valve switching device having a simple structure capable of surely performing a mechanical air valve switching operation without imposing a great burden on an operator. The purpose is to provide.

[0019]

SUMMARY OF THE INVENTION An air valve switching device according to the present invention is an air valve switching device that applies an operating force to a protruding portion of a switching spool from a housing to switch the air supply state. A cam that is rotatably supported about one axis that is substantially orthogonal to the axis, and that has irregularities that are regularly arranged on the outer periphery thereof in contact with the protrusions to apply the operating force, and a pivotal support of the cams. A one-way clutch that is interposed in the cam and allows only rotation of the cam in one direction;
A link mechanism that operates according to an operation from the outside and applies a rotational force in the one direction to the pivot shaft of the cam, and the operation amount of the link mechanism is set to a unit amount corresponding to the juxtaposed interval of the unevenness. And limiting means.

[0020]

According to the present invention, when an external operation is performed, the operation of the link mechanism in response to the operation causes the cam to rotate by a unit amount in one direction, and the concavo-convex arranged in parallel on the outer circumference of the cam. Either of them comes into contact with the projecting portion of the switching spool, and the switching spool is moved by the additional force applied to the projecting portion to switch the air feeding state. Since the rotational position of the cam is retained even after the release of the operating force by the operation of the one-way clutch interposed in the pivot portion of the cam,
No change in the feeding state occurs until the next operation is performed.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing its embodiments. FIG. 3 is a perspective view of an essential part of a sewing machine showing an example of application of the air valve switching device according to the present invention to a guide device for belt-shaped sewn products.

The guide device 3 for the belt-shaped sewn product has the same structure as that of the conventional device shown in FIG. 1, and a board 30 mounted along the front part of the sewing machine bed B is installed in the extending direction of the sewing machine bed B. A movable rod 31 and a guide rod 35 are slidably supported, and an air cylinder 32 for advancing and retracting in the extending direction of the sewing machine bed B is fixed, and the tip of the output rod of the air cylinder 32 is fixed to the movable rod. While being connected to the base end of 31, a guide plate 33 that guides the strip-shaped rubber R is attached to the distal ends of the movable rod 31 and the guide rod 35, and a mounting bracket 34.
It is fixed through.

The guide plate 33 is a thin slide plate 33a aligned with the surface of the sewing machine bed B in front of the needle drop position.
A ruler plate 33b is laminated on a half portion of the upper surface of the sewing machine bed B, and the movable rod 31 slides as the air cylinder 32 moves forward and backward. To move.

In the guide device 3 as described above, the air cylinder 32 is set in the retracted state during normal sewing work, and the guide plate 33 is positioned and used in the illustrated working position. At this time, the strip-shaped rubber R to be guided has one edge thereof on the ruler plate 33b.
By advancing along the side edges of the belt, the belt is fed to the needle drop position while maintaining a proper posture, and the belt-shaped rubber R and the sewing cloth C superposed on the belt-shaped rubber R can be reliably sewn together.

On the other hand, at the end of sewing when the sewing start portion where the sewing with the belt-shaped rubber R is completed is returned to the front of the needle drop position, the air cylinder 32 is advanced to move the white cylinder in the figure. The guide plate 33 is moved in the direction indicated by the arrow to position it at a non-acting position deviated from the extension line of the needle drop position. At this time, since the guide plate 33 deviates from the stitching line between the belt-shaped rubber R and the sewing cloth C, the feeding of the sewing cloth C is not hindered and there is no risk of hindering the sewing operation.

In such an operation, the guide rod 35 prevents the movable rod 31 from rotating around the axis, and causes the movement path of the guide plate 33 to follow the surface of the sewing machine bed B correctly. Further, the stopper ring 37 fitted in the middle of the guide rod 35 serves to limit the sliding range of the movable rod 31 by the contact with the support plate 36 of the movable rod 31. That is, by changing the fitting position of the stopper ring 37 in the longitudinal direction of the movable rod 31, the separation length between the working position and the non-working position can be appropriately set according to the sewing conditions such as the width of the strip rubber R. Can be set.

The air valve switching device 1 according to the present invention comprises:
In the guide device 3 which operates as described above, the supply and non-supply of the operating air to the air cylinder 32, which is the drive source of the guide plate 33, is switched. It is configured so that it can be operated by the knees of a worker who is seated in the front. FIG. 4 is a side view of the switching device 1 according to the present invention.

The operating side structure of the switching device 1 according to the present invention is similar to that of the conventional switching device 4 shown in FIGS. 1 and 2, and one side end of the base 10 fixed to the back surface of the sewing machine table T is shown. A swinging block 11 is attached near the portion so as to swing freely around a horizontal axis, and a connecting rod 12 bent in an L shape is attached to the swinging block 11.
One end of the connecting rod 12 is fixed, the other side of the connecting rod 12 is extended downward, and the knee pushing plate 13 is fixed to the tip of the same side. The oscillating block 11 is a spiral spring interposed in its pivotal support.
It is biased clockwise in the figure by the spring force of 15, and is normally in a state of being restrained in the position shown in the figure, and only when the knee pushing plate 13 is pushed by the operator's knee, It is adapted to swing counterclockwise against the bias of the spiral spring 15.

A bracket 14 is erected on the other side of the base 10, and the air valve 2 is fixed to the bracket 14. The air valve 2 is similar to that used in the conventional switching device 4 shown in FIGS. 1 and 2, and one end of a switching spool incorporated therein is projected to one side of a tubular housing 20. By applying an operating force (pressing force) to the projecting portion 21 and moving the switching spool, the air feeding state is switched, specifically, the non-feeding state is switched to the feeding state. It is a mechanical valve having a configuration, and the fixing of the air valve 2 to the bracket 14 is
The projecting portion 21 faces the swing block 11, and the axis of the switching spool is substantially parallel to the lower surface of the base 10.

The housing 20 of the air valve 2 is connected to a supply / discharge pipe 22 connected to the air cylinder 32, an air supply pipe 23 connected to an air source (not shown), and an exhaust pipe 24 open to the atmosphere. The protrusion 21 is biased toward the outside of the housing 20 by the action of a spring (not shown) built in the housing 20, and when no pressing force acts on the protrusion 21, inside the housing 20. The switching spool is constrained to a first switching position that allows the supply / discharge pipe 22 to communicate with the exhaust pipe 24. At this time, the air cylinder
The operating air inside 32 is discharged through the exhaust pipe 24, and the guide plate 33 is positioned at the above-mentioned working position by the retreating operation of the air cylinder 32.

On the contrary, when a pressing force is applied to the protrusion 21 and is pushed into the housing 20 against the bias of the spring,
Inside the housing 20, the switching spool moves to a second switching position where the supply / discharge pipe 22 communicates with the air supply pipe 23. At this time, high-pressure air supplied via the air supply pipe 23 is supplied to the air cylinder 32 via the air supply / discharge pipe 22, and the guide plate 33 is moved by the advancing operation of the air cylinder 32.
It is positioned in the non-acting position described above.

On the other hand, a cam base 16 is provided upright between the fixed position of the air valve 2 under the base 10 and the pivotal position of the rocking block 11, and the cam base 16 has a disk shape. Cam 5
Is substantially aligned with the protruding position of the protruding portion 21 of the air valve 2 and is substantially orthogonal to this protruding direction, and the base 10
It is mounted rotatably around a pivot axis that is substantially parallel to the lower surface of the.

A plurality of arcuate recesses 5a, 5a are formed on the outer periphery of the cam 5 facing the tip of the protrusion 21 of the air valve 2.
... are formed in equal distribution, and as shown in FIG. 4, when any of these recesses 5a, 5a ... Aligns with the tip of the projection 21, the projection 21 is projected by the spring force, In the air valve 2, the above-mentioned first switching position is realized, and conversely, when any of the protrusions 5b, 5b ... Between the recesses 5a, 5a ... Part 21
Is pressed to retreat (see FIG. 5) and the second switching position described above is realized.

On the pivot shaft of the cam 5 constructed as described above, a one-way clutch 6 which allows only one-direction rotation (clockwise rotation in the drawing) of the cam 5 is attached.
The one-way clutch 6 and the link mechanism 7 are connected to the pivot portion of the swing block 11. As shown in the figure, the link mechanism 7 has a long link member 7a whose one end is fixed to the pivot portion of the swing block 11, and one end of which is fixed to the pivot shaft of the cam 5 through the one-way clutch 6. A short link member 7b is provided, and a connecting pin 7d protruding from the other end side of the latter is inserted into a long hole 7c formed in the other end side of the former and extending in the axial direction. It has a structure in which it is connected by a twisted pair.

When the swing block 11 swings as described above in response to the pressing operation of the knee push plate 13, the link member 7a on the same side rotates counterclockwise in accordance with this swing, This rotation is transmitted to the link member 7b along with the sliding of the connecting pin 7d along the elongated hole 7c, the link member 7b rotates clockwise, and this rotation is further transmitted to the cam 5 via the one-way clutch 6. When transmitted, the cam 5 is rotated by an angle corresponding to the rotation angle of the link member 7b.

The rotation of the link member 7a caused by the rocking of the rocking block 11 corresponds to the position of the protrusion 70 projecting toward the base 10 side in the middle of this and the lower surface of the base 10. It is designed to be restricted by abutting against a stopper 71 standing upright, and the rotation angle of the link member 7a in the meantime is the rotation angle generated in the cam 5 by the transmission of this rotation. It is set to have a rotation angle (unit angle) that corresponds to the interval between them and 5b. The stopper 71 is a bolt screwed to a nut fixedly mounted on the base 10 as shown in the figure, and the height of protrusion from the base 10 can be adjusted appropriately, and the rotation angle of the link member 7a can be adjusted by this adjustment. , And the fine adjustment of the rotation angle of the cam 5 by this.

FIG. 4 shows a state in which the protruding portion 21 of the air valve 2 is aligned with the concave portion 5a on the outer periphery of the cam 5 and the air valve 2 is in the first switching position. In this state, the knee pushing plate 13 is operated. When a force is applied, the state of each part of the switching device 1 becomes as shown in FIG. The operation force is applied to the knee push plate 13 in the direction shown by the white arrow in the figure, and at this time, the rotation transmitted through the link mechanism 7 and the one-way clutch 6 that operate as described above. The cam 5 rotates clockwise by the unit angle, the convex portion 5b adjacent to the concave portion 5a aligns with the projecting portion 21, and the convex portion 5b applies a pressing force to the projecting portion 21. In the above, the second switching position is realized, and the advancing operation of the air cylinder 32 in accordance with this realizes the positioning of the guide plate 33 in the non-acting position.

After that, when the application of the operating force to the knee pressing plate 13 is released, the rocking block 11 returns by the spring force of the spiral spring 15, and the link members 7a and 7b are not in the above-mentioned directions. Although rotating in the opposite direction, this rotation is absorbed by the action of the one-way clutch 6 without being transmitted to the cam 5, and the cam 5 maintains the rotational position shown in FIG. Will never occur,
The guide plate 33 maintains the non-acting position.

Further, in order to return the guide plate 33 to the working position from this state, the knee push plate 13 may be operated again, and in response to this operation, the cam 5 is rotated by the unit angle and the cam 5 is rotated. The rotational position shown in FIG. 4 in which the concave portion 5a on the outer periphery of the outer peripheral surface 5 is aligned with the projecting portion 21 is obtained, the first switching position is realized in the air valve 2, and the retracting operation of the air cylinder 32 associated therewith causes the guide plate 33 moves to the working position and is positioned there.

As described above, in the air valve switching device 1 according to the present invention, the switching position of the air valve 2 is changed every time the knee pressing plate 13 is pressed, and the switching position thus obtained is as follows. It is held until another operation is performed. Therefore, in the conventional switching device 4, it is not necessary to continue the pressing state of the knee pressing plate 13 which is necessary for holding the switching position, and a switching operation of the mechanical air valve 2 requires a great labor burden on the operator. It can be done reliably without being forced.

In this embodiment, the application of the guide device 3 for changing the position of the guide plate 33 of the sewing machine between the working position and the non-working position has been described, but the switching device 1 according to the present invention is described. Needless to say, can be widely applied as a mechanical air valve switching device used for controlling the supply air to various actuators operated by air.

Further, in the present embodiment, the case where the air valve 2 which performs the two-stage switching operation of feeding and non-feeding is used is described, but the application of the switching device 1 according to the present invention is multistage. It is also possible to use an air valve capable of switching the feeding state of the above, and in this case, it is only necessary to change the mode of forming the irregularities on the outer periphery of the cam 5.

Further, in the present embodiment, the operating force for switching is applied to the knee pushing plate 13 by the knee of the operator, but the mode of applying the operating force is not limited to this, and for example, swinging is possible. It can be configured to be manually operable by fixing the proximal end of the manual lever to the block 11.

[0044]

As described above in detail, in the air valve switching device according to the present invention, the cam is rotated by a unit amount in one direction by the operation of the link mechanism according to the operation from the outside, and the outer periphery of the cam is rotated. The projections and depressions of the switching spool are brought into contact with the projections and depressions that are juxtaposed in parallel with each other, and the supply of air is switched by the additional force applied to the projections. As a result, the rotational position of the cam is maintained even after the operating force is released, and the feeding state after the switching is maintained, so that the air valve switching operation is performed without imposing unnecessary labor. By applying to the guide device attached to the sewing machine to change the position of the guide plate that guides the object to the needle drop position between the working position and the non-working position, the labor burden on the operator for this position change is greatly reduced. so That. Further, a mechanical air valve can be used as the air valve, and unlike the same type device configured by using an electromagnetic air valve, expensive auxiliary equipment such as a control box is not required, and the equipment cost can be reduced. Etc., the present invention has excellent effects.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of a sewing machine including a conventional guide device for changing the position of a guide plate.

FIG. 2 is a side view of an air valve switching device in a conventional guide device.

FIG. 3 is a perspective view showing an essential part of a sewing machine having a guide device using the air valve switching device according to the present invention.

FIG. 4 is a side view of an air valve switching device according to the present invention.

FIG. 5 is an operation explanatory view of an air valve switching device according to the present invention.

[Explanation of symbols]

 1 Switching device 2 Air valve 3 Guide device 5 Cam 5a Recess 5b Convex 6 One-way clutch 7 Link mechanism 7a Link member 7b Link member 10 Base 11 Swing block 12 Movable rod 13 Knee plate 14 Bracket 15 Helix spring 20 Housing 21 Projection part 22 Supply / discharge pipe 23 Air supply pipe 24 Exhaust pipe 31 Movable rod 32 Air cylinder 33 Guide plate 70 Protrusion 71 Stopper B Sewing machine bed T Sewing machine table

Continued front page (56) References Open 63-149389 (JP, U) Open 63-177482 (JP, U) Open 64-49758 (JP, U) Open 4-1-17771 (JP , U) Actually open 63-177482 (JP, U) Actually open 60-149389 (JP, U) Actually open 2-149417 (JP, U) Actually open 1-167456 (JP, U) Actually open 61-32877 (JP, U) Actual opening Sho 59-128980 (JP, U) Actual opening Sho 61-182480 (JP, U) Actual opening Sho 63-56760 (JP, U) Actual opening Sho 59-128980 (JP, U) JP-B 7-56719 (JP, B2) JP-B 6-45359 (JP, B2) JP-B 37-32252 (JP, B1) JP-B 2-43338 (JP, Y2)

Claims (1)

(57) [Scope of utility model registration request] 1. A switching device for an air valve, which applies an operating force to a projecting portion of a switching spool from a housing to switch the air supply state, and is rotatably supported around one axis substantially orthogonal to the axis of the switching spool. And a cam for abutting the protrusions and depressions arranged regularly on the outer periphery of the cam to apply the operation force, and a cam pivotally supported by the cam for rotating the cam in one direction. A one-way clutch that allows only
A link mechanism that operates according to an operation from the outside and applies a rotational force in the one direction to the pivot shaft of the cam, and the operation amount of the link mechanism is set to a unit amount corresponding to the juxtaposed interval of the unevenness. An air valve switching device, comprising: a limiting device.