JP2006191969A - Puller device of sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a puller device of a sewing machine capable of uniformly carrying an object to be sewn. <P>SOLUTION: The puller device 100 is attached to a main body frame 2 and is provided with an upper roller 40 to be in contact with the object to be sewn from the upper side, a lower roller 50 to be in contact with the object to be sewn from the lower side and an upper roller driving mechanism 10 for transmitting rotary driving force to the upper roller 40. The upper roller 40 is provided such that its axis is orthogonal to a carrying direction on the downstream side of a needle location position and is disposed such that the lower end of a peripheral surface is at the almost same height as the upper surface of a bed part 3. The lower roller 50 is disposed at one end of the bed part 3 which is the lower side of the upper roller 40 and is provided with two lower rollers 50a and 50b of the same diameter arranged in an axial direction. The lower rollers 50a and 50b are respectively movable in a Z axis direction along a guide means and one is vertically moved in a direction opposite to the other by being connected through a linking mechanism. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a puller device for a sewing machine.

  In a puller device for a sewing machine that applies a pulling force toward the downstream side in the cloth feed direction to the cloth to be sewn, etc., downstream of the sewing position in the cloth feed direction, that is, downstream of the needle drop position in the cloth feed direction. The cloth is sequentially conveyed to the downstream side by sandwiching the cloth between the pair of upper and lower rollers and rotating the rollers.

Among these, a pair of upper and lower conveying rollers having parallel rotation axes are provided, the position of the rotation axis of the lower roller contacting the sewing object from the lower side is fixed, and the upper roller can be moved up and down by a manual lever. A sewing machine puller device is known (see, for example, Patent Document 1).
In addition, sewing machine puller devices, etc. have been developed in which the upper roller moves up and down according to changes in the fabric thickness when sewing items with different thicknesses or when sewing a plurality of items to be sewn together. .
JP 2001-353388 A

  However, in the conventional sewing machine puller device shown in the above-mentioned Patent Document 1 and the like, the sewing product is conveyed by the upper and lower rollers each having a parallel rotation axis. In the range of the width of the roller perpendicular to the front-rear direction (the left-right direction), and when the conveying operation is continued with the thickness or number of items to be sewn biased to the left or right as required The roller pressure applied to the thick part is larger than that of the thin part. In addition, in the conventional sewing machine puller device configured so that the upper roller moves up and down in accordance with the change in the fabric thickness, the conveying force applied to the thin part is reduced, or the idling occurs in the thin part. There has been a problem in that the left and right conveying forces vary with respect to the conveying direction, and the sewing product cannot be conveyed straight and the desired sewing product quality cannot be obtained.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a sewing machine puller device that can uniformly convey a sewing product.

  In order to solve the above-mentioned problem, the invention according to claim 1 is provided with an upper roller that comes into contact with the workpiece from the upper side and a lower roller that comes into contact with the workpiece from the lower side, and a sewing position in the cloth feeding direction. A puller device for a sewing machine that applies a pulling force to the sewing product downstream in the feed direction on the downstream side of the sewing machine, wherein at least one of the upper roller or the lower roller includes a plurality of rollers arranged in the axial direction. The plurality of rollers can be moved away from and in contact with the other roller facing each other with the object to be sewn, and are provided with an elastic body so as to be pressed with an urging force against the other roller. This is a sewing machine puller device.

  The invention according to claim 2 is provided with an upper roller that comes into contact with the sewing product from above and a lower roller that comes into contact with the sewing product from below and that is on the downstream side of the sewing position in the cloth feeding direction. In the puller device of the sewing machine that applies a pulling force to the downstream side in the feed direction, at least one of the upper roller or the lower roller is composed of two rollers arranged in the axial direction, and the two rollers are respectively A sewing machine characterized in that it can be moved toward and away from the other roller along the guide means, and one of the two rollers arranged in the axial direction is connected so as to move in the opposite direction to the other. This is a puller device.

  According to a third aspect of the present invention, in the sewing machine puller device according to the second aspect, the two rollers are respectively connected to one end and the other end of a link having a fulcrum at a substantially central portion of each other. It is characterized by being.

  According to the invention described in claim 1, since at least one of the upper roller and the lower roller is composed of a plurality of rollers arranged in the axial direction, the direction orthogonal to the transport direction, that is, the axial direction of the roller Even when the thickness of the sewing material varies over the range, each roller individually moves the shaft according to the thickness. Therefore, the rotation surface (circumferential surface) of the roller can be brought into close contact with the sewing product over substantially the entire width of the sewing product orthogonal to the conveyance direction. Therefore, the rotating surface (circumferential surface) of the roller is securely brought into close contact with the workpiece, and variations in the conveying force in the axial direction can be suppressed. In addition, since the plurality of rollers are provided with an elastic body so as to come into contact with the sewing product with a biasing force, the rotation surfaces (circumferential surfaces) of the plurality of rollers are always against the sewing product. It will be pressed. Therefore, no idling occurs in the individual rollers, and a feeding operation for conveyance can be reliably given to the sewing product.

  According to the invention described in claim 2, since at least one roller of the upper roller and the lower roller is composed of two rollers arranged in the axial direction, each roller individually corresponds to the change in the cloth thickness. The rotation surface (circumferential surface) of the roller can be brought into close contact with the sewing product over substantially the entire width of the sewing product orthogonal to the conveying direction. Further, each of the two rollers is moved along the guide means. Therefore, the rotating surface (circumferential surface) of the roller is securely brought into close contact with the workpiece, and the conveying force can be maintained uniformly. Furthermore, since one of the two rollers moves up and down in the direction opposite to the other, when the cloth thickness of the material to be sewn is changed, one of the rollers on the side of feeding the thick cloth is The other roller is positively moved in the direction of approaching the workpiece while it is moved in the direction of reducing the contact pressure, that is, in the direction away from the workpiece. Therefore, since the variation in the axial direction of the contact pressure in the width direction of the workpiece to be conveyed can be suppressed, the variation in the conveying force can be eliminated. Thereby, a to-be-sewn material can be conveyed straight, and desired sewing product quality can be obtained.

  According to the invention described in claim 3, the same effect as that of the invention described in claim 2 can be obtained. In particular, the two rollers are connected by a link mechanism having a fulcrum at a substantially central portion of each other. Therefore, when the fabric thickness of the material to be conveyed changes, one roller is moved in the direction to reduce the contact pressure, and at the same time, the other roller is actively sewn. It is moved in real time in the direction approaching the object. Therefore, the contact pressure in the width direction of the workpiece to be conveyed can be always maintained uniformly, and variations in the conveying force can be eliminated. Thereby, a to-be-sewn material can be reliably conveyed straight, and desired sewing product quality can be obtained. In addition, the simple structure of being connected by the link mechanism can provide an effect that the variation in the conveying force in the axial direction can be made uniform while suppressing the cost.

  Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. The puller device 100 for a sewing machine according to the present embodiment is provided as a transport mechanism that applies a pulling force toward the downstream side in the feed direction to the workpiece on the downstream side of the sewing position in the cloth feed direction. In this embodiment, the direction in which the sewing needle 8 moves up and down is the Z-axis direction (up-down direction), and one direction (feeding direction of the workpiece) orthogonal to this is the X-axis direction (front-rear direction), X A direction orthogonal to both the axial direction and the Z-axis direction will be described as the Y-axis direction (left-right direction). In this embodiment, the cloth to be sewn is conveyed in the X-axis direction, that is, in the direction of arrow A in FIG. 1, and the back side in FIG. 1 is the upstream side and the near side is the downstream side. Yes.

(Overall configuration of the embodiment)
FIG. 1 is a perspective view showing an overall configuration of a puller device 100 of a sewing machine 1 according to this embodiment.
As shown in FIG. 1, a puller device 100 of the sewing machine 1 (hereinafter referred to as a puller device 100) is attached to a main body frame 2 of the sewing machine 1, and includes an upper roller 40 that comes into contact with a sewing object from above and a lower side. The main part is comprised including the lower roller 50 which contacts a to-be-sewn material, and the upper roller drive mechanism 10 which transmits rotational driving force to the upper roller 40.

(Body frame)
The main body frame 2 is disposed in parallel with the XY plane and includes a bed portion 3 provided with a needle plate 9 on the upper surface of one end portion, and a vertical trunk portion 4 erected from the other end side of the bed portion 3. And an arm part 5 extending in the same direction as the bed part 3 from the upper end of the vertical body part 4, and is formed in a substantially U-shape as a whole.
A needle drive mechanism (not shown) is built in the tip of the arm unit 5. The needle drive mechanism is provided with a needle bar 7, and the needle bar 7 projects downward from the tip of the arm portion 5. A sewing needle 8 is supported at the lower end of the needle bar 7. The needle bar 7 is reciprocated in the vertical direction, that is, the Z-axis direction by the needle drive mechanism, so that the sewing needle 8 drops the needle into the needle hole formed in the needle plate 9 of the bed portion 3. It is like that.

(Upper roller)
The upper roller 40 is disposed on the downstream side of the above-described needle drop position, and its axis is parallel to the Y-axis direction, that is, orthogonal to the transport direction, and the lower end of the peripheral surface is the upper surface of the bed portion 3. It is arrange | positioned so that it may become substantially the same height. As shown in FIG. 1, the upper roller 40 is suspended by the support mechanism 20 below the front end of the arm portion 5.
Specifically, the support mechanism 20 is provided from the tip side surface portion of the arm portion 5 on the downstream side to the needle drop position described above, and is fixed to the tip side surface portion of the arm portion 5. The guide member 21 is provided. Guide holes 21a (the other is not shown) are formed above and below the guide member 21, and a shaft 22 is inserted into these guide holes 21a so as to be slidable in the axial direction (vertical direction). A portal frame 23 is fixedly supported at the lower end of the shaft 22. The arms extend from both ends in the Y-axis direction of the portal frame 23 toward the lower side, and an upper roller shaft 24 that supports the upper roller 40 is supported on the lower end side of each arm. A clutch mechanism 25 is connected to the upper roller shaft 24, and the upper roller 40 can be intermittently rotated only in one direction in response to a rotation operation by an upper roller driving mechanism 10 described later. Thereby, the upper roller 40 in the present embodiment is in a state where the sewing needle 8 that is driven up and down by rotation of a sewing machine motor (not shown) is positioned on the lower side of the vertical movement, that is, the sewing needle 8 is stuck in the sewing product. In this case, the conveying operation is not performed, and the conveying operation is performed when the sewing needle 8 is positioned above the vertical movement, that is, when the sewing needle 8 is detached from the sewing product, and acts on the sewing needle 8. Can be reduced.

In addition, a shaft holder 26 is fixedly installed in an intermediate portion of the shaft 22, and a coil spring 27 is interposed in an intermediate portion of the shaft 22 extending from the upper surface of the shaft holder 26 to the guide member 21. The coil spring 27 is mounted in a compressed state rather than the natural length, and the portal frame 23 and the upper roller 40 are always directed to the lower side, that is, the lower roller 50 side described later via the shaft holder 26 and the shaft 22. It has come to be energized.
In addition, the lower end of the peripheral surface of the upper roller 40 is separated from the height of the upper surface of the bed portion 3 by operating levers 28 and 29 connected to the shaft 22 via a link mechanism or a cam mechanism. The upper position, which is in the state, and the lower end of the peripheral surface of the upper roller 40 are moved up and down to the height of the bed portion 3, that is, the lower position in which the lower roller 50 can be brought into contact with the peripheral surface of the lower roller 50, which will be described later. It can be held at each vertical position.
The upper roller 40 is connected to an upper roller driving mechanism 10 that applies a feeding operation to the upper roller 40.

(Upper roller drive mechanism)
Next, the upper roller driving mechanism 10 that applies a feeding operation to the upper roller 40 will be described.
As shown in FIG. 1, the upper roller driving mechanism 10 is disposed from the side surface of the arm portion 5 on the downstream side of the needle drop position described above to the lower side of the tip of the arm portion 5. The upper roller driving mechanism 10 is provided as a transmission mechanism that obtains a driving force from an upper shaft 6 that is a main shaft that is rotationally driven by a sewing motor (not shown) and transmits a feeding operation to the upper roller 40.
The upper shaft 6 extends along the longitudinal direction inside the arm portion 5, that is, the Y-axis direction, and an eccentric cam 11 is provided on the upper shaft 6. One end of a rod 12 is rotatably fitted to the outer periphery of the eccentric cam 11. The other end of the rod 12 is rotatably connected to an arm portion protruding from the swing shaft holder 13. One end of a swing shaft 14 is inserted into and fixed to the swing shaft holder 13.
The swing shaft 14 extends substantially parallel to the above-described upper shaft 6, that is, along the Y-axis direction. The above-described eccentric cam 11, rod 12, and swing shaft holder 13 are moved along with the rotation of the upper shaft 6. Through the axis, and forward and reverse rotation in the direction around the axis. One end (upper end) of a rod 15 is fixed to the other end of the swing shaft 14, and the rod 15 swings about the swing shaft 14. A long hole 15 a is formed from the substantially central portion of the rod 15 to the lower side, and one end of a link 17 is connected to the long hole 15 a via an adjustment pin 16. One end (upper end) of a feed lever 19 is rotatably connected to the other end of the link 17 via a pin 18. The upper roller 40 is connected to the other end (lower end) side of the feed lever 19 via the clutch mechanism 25 and the upper roller shaft 24 described above.

(Lower roller)
Next, the lower roller 50 in the present embodiment will be described in detail.
The lower roller 50 is disposed on the lower side of the above-described upper roller 40 and at one end of the bed portion 3 facing the upper roller 40, and has two lower rollers 50a and 50b having the same diameter arranged in the axial direction. It has.
Both the lower rollers 50a and 50b are rotatably supported by the support frames 52a and 52b via the lower roller shaft along the Y-axis direction. That is, the lower rollers 50a and 50b rotate with respect to the above-described upper roller 40, which is a driving wheel, at the lower position facing the upper roller 40 by coming into contact with the workpiece to be conveyed in the gap between them. It is provided as a driven wheel. The lower rollers 50a and 50b are configured such that, when they are arranged in the axial direction, the width in the Y-axis direction, which is a combination of the two, is substantially equal to that of the upper roller 40. Support frame bases 53a and 53b are respectively formed on the lower ends of the support frames 52a and 52b so as to protrude downward. The support frame bases 53a and 53b are disposed as guide means on the lower sides of the support frames 52a and 52b, respectively. The support frame guide portions 54a and 54b are engaged with each other and are slidable in the vertical direction. Thus, the two lower rollers 50a and 50b are respectively orthogonal to the cloth feeding direction (X-axis direction) and the axial direction (Y-axis direction) of the lower roller shafts 51a and 51b along the guide means, that is, It can move in the Z-axis direction.
In addition, protrusions 55a and 55b are formed on the support frame bases 53a and 53b.
A support hole 56 of a link body 58, which will be described later, is formed substantially in the middle between the support frame guide portions 54a and 54b. A link body 58 is rotatably connected to the support hole 56 via a step screw 57. Long holes 58a and 58b are formed on the left and right sides of the central portion of the link body 58, and the protrusions 55a and 55b described above are formed in the long holes 58a and 58b, respectively, as shown in FIG. It is slidably engaged along the longitudinal direction of 58a, 58b.
Thus, the lower rollers 50a and 50b are connected via the link body 58 having a fulcrum at a substantially central portion of each other, so that one of them moves up and down in the direction opposite to the other.
When the lower rollers 50a and 50b are aligned at the same height, an appropriate clearance is provided between the lower end surfaces of the support frame bases 53a and 53b and the bottom surfaces inside the support frame guide portions 54a and 54b. That is, a gap is provided so that any one of the lower rollers 50a and 50b can be raised or lowered.
Further, the lower rollers 50a and 50b have a function of uniformly maintaining the pressure in contact with the sewing object according to the change in the cloth thickness like the seesaw by the link body 58. The lower rollers 50a and 50b are respectively The contact is made with equal pressure.

Next, the operation of the sewing machine puller device 100 according to the present embodiment will be described in detail with reference to the drawings.
First, before starting the sewing operation, the upper roller 40 and the lower rollers 50 a and 50 b are both stopped, and the upper roller 40 is held at the lower position by the support mechanism 20.
At the start of sewing, the cloth to be sewn is fed onto the bed 3 by a known cloth feed mechanism (not shown), and the leading end of the cloth is held between the upper roller 40 and the lower rollers 50a and 50b.
Here, when there is no variation in the thickness of the cloth in the left-right direction, the two lower rollers 50a and 50b are both in contact with the lower surface of the cloth at the same height as shown in FIG. It becomes a state. And if a conveyance operation is started with the start of sewing operation | movement, the upper roller 40 and lower roller 50a, 50b will rotate in the arrow direction in FIG. 4, and will convey a cloth downstream.
Next, for example, in the case where overlap stitching is performed only on either the left or right side in the transport direction, the thickness varies in the left-right direction with respect to the transport direction. In such a case, as shown in FIG. 5, the lower roller 50b on the side where the fabric thickness of the sewing product is thick is pushed down. At the same time, the lower roller 50a on the other side connected by the protrusion 55 and the link body 58 is pushed upward. And lower roller 50a, 50b balances in the height from which the surface pressure which acts on the upper roller 40 side becomes equal. That is, the puller device 100 of the sewing machine according to the present embodiment functions as an adjustment mechanism that applies a uniform surface pressure to the workpiece to be conveyed without depending on the thickness variation in the left-right direction. .
In addition, the sewing machine puller device 100 according to the present embodiment has a variation in the thickness of the cloth in the left-right direction with respect to the transport direction due to a change in the cloth thickness not only at the start of the sewing operation but also during the transport operation. Even so, since the lower roller 50 raised through the link mechanism and the lower roller 50 raised simultaneously operate simultaneously, the surface pressure is reliably maintained even immediately after the change in the fabric thickness occurs. It is what is done.

As described above, according to the puller device 100 of the sewing machine according to the present embodiment, the lower roller 50 is configured by the two lower rollers 50a and 50b arranged in the axial direction. It can be moved individually according to the change in the cloth thickness, and the rotation surface (circumferential surface) of the roller can be brought into close contact with the cloth over the entire width of the cloth orthogonal to the conveying direction. Further, since the lower rollers 50a and 50b are moved along the support frame guide portions 54a and 54b, which are guide means, respectively, the rotating surface (circumferential surface) of the roller is vertically opposed to the sewing product even during movement. The maintained state can be maintained. Therefore, the rotation surface (circumferential surface) of the roller is securely brought into close contact with the workpiece, and the conveying force can be maintained uniformly. As a result, the contact pressure in the width direction of the workpiece to be conveyed can be maintained uniformly, so that variations in the conveying force can be eliminated. Therefore, the sewing object can be conveyed straight and desired sewing product quality can be obtained.
Moreover, the above-mentioned effect can be acquired, suppressing cost by having set it as the simple structure that two rollers are connected by the link mechanism which has a fulcrum in the substantially center part of each other.

The lower roller 50 may be composed of a plurality of rollers that move up and down independently along the guide. If it does in this way, according to the change of the cloth thickness over the Y-axis direction of a to-be-sewn thing, a feeding operation can be provided with a substantially uniform pressure. Thereby, the deviation of the cloth feed amount in the Y-axis direction can be prevented. In this case, the plurality of rollers may be always urged toward the sewing object side by the elastic body. If it does in this way, the rotating surface of the upper roller 40 and the lower roller 50 can always be closely_contact | adhered with respect to a to-be-sewn material, and conveyance force can be provided reliably. In this case, the lower roller 50 may be arranged by arranging a larger number of rollers in the axial direction.
Moreover, it is preferable that the two lower rollers 50a and 50b have the same diameter as shown in this embodiment. If it does in this way, a uniform pressure will be acted with respect to a to-be-sewn item, and it can convey a to-be-sewn item with the same feed amount on either side.
Further, the moving direction (sliding direction) of the lower roller 50 is preferably parallel to the Z-axis direction, that is, a direction orthogonal to both the cloth feeding direction and the axial direction of the lower roller 50, but the direction is slightly shifted. Needless to say, this is applicable.
In the present embodiment, the upper roller 40 is configured to be a driving wheel for feeding operation, but the lower roller 50 may be configured to be rotationally driven as a driving wheel.
In the present embodiment, one upper roller 40 and two lower rollers 50a and 50b are provided. However, the present invention is not necessarily limited to this. For example, for one lower roller 50, Two or more upper rollers 40 may be provided, or two or more upper rollers 40 and two or more lower rollers 50 may be provided.
In addition, the two rollers 50a and 50b are connected by the link body 58. However, the present invention is not limited to this. For example, both the support frames 52a and 52b are provided with racks along the vertical direction facing each other. It is good also as a structure which arrange | positions and interposes the pinion which meshes | engages with both racks between them, and may provide the other means which moves the two rollers 50a and 50b by the same movement distance in a mutually reverse direction.

1 is a perspective view showing an overall configuration of a sewing machine puller device 100 according to the present invention. It is an exploded view which shows the structure of the lower roller 50 in this embodiment. It is a perspective view which shows the structure of the lower roller 50 in this embodiment. It is operation | movement explanatory drawing explaining the conveyance operation in this embodiment. It is operation | movement explanatory drawing explaining the conveyance operation in this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sewing machine 2 Main body frame 3 Bed part 4 Body part 5 Arm part 6 Upper shaft 7 Needle bar 8 Sewing needle 9 Needle plate 10 Drive mechanism 11 Eccentric cam 12, 15 Rod 13 Oscillating shaft holder 14 Oscillating shaft 16 Adjustment pin 17 Link 18 pin 19 feed lever 20 support mechanism 21 shaft holding member 21a support hole 22 shaft 23 portal frame 24 upper roller shaft 25 clutch mechanism 26 shaft shaft holding 27 coil spring 28, 29 operation lever 40 upper roller 50 lower rollers 52a, 52b Frames 53a and 53b Support frame bases 54a and 54b Support frame guide portions 55a and 55b Protrusion portion 56 Support hole 57 Step screw 58 Link body

Claims (3)

An upper roller that comes into contact with the workpiece from the upper side and a lower roller that comes into contact with the workpiece from the lower side, and is pulled downstream in the feed direction with respect to the workpiece at the downstream side of the sewing position in the cloth feed direction. In the sewing machine puller device that applies force,
Among the upper roller and the lower roller, at least one is composed of a plurality of rollers arranged in the axial direction, and the plurality of rollers can be moved toward and away from the other roller facing each other with the sewing product interposed therebetween. A puller device for a sewing machine comprising an elastic body and configured to be pressed against the other roller with an urging force. An upper roller that comes into contact with the workpiece from the upper side and a lower roller that comes into contact with the workpiece from the lower side, and is pulled downstream in the feed direction with respect to the workpiece at the downstream side of the sewing position in the cloth feed direction. In the sewing machine puller device that applies force,
Of the upper roller or the lower roller, at least one is composed of two rollers arranged in the axial direction, and the two rollers are respectively movable toward and away from the other roller along the guide means, and A puller device for a sewing machine, wherein one of two rollers arranged in the axial direction is connected so as to move in a direction opposite to the other.   The puller device for a sewing machine according to claim 2, wherein the two rollers are connected to one end and the other end of a link having a fulcrum at a substantially central portion of each other.

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