JPH1025653A - Fabric-spreading device of sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To freely sew whole circumference of a processed fabric such as hosiery by rotating the cylindrical processed fabric around the circumference of a cylindrical bed. SOLUTION: A substrate 12 is attached to a movable frame 6 of an embroidery machine. Three spindles 15, 16 and 17 pivoted on the substrate 12 are inserted onto the inside of a pair of fabric-stretching frames 13 and 14 and rollers 18 provided in each spindle are each brought into contact with the inner circumference of fabric-stretching frames 13 and 14. Thereby, both fabric- stretching frames 13 and 14 are supported at prescribed intervals at longitudinal position of needle dropping hole 3 and whole circumference of interval between both fabric-stretching frames 13 and 14 is formed as an opening 19. The cylindrical processed fabric such as hosiery is covered onto the fabric-stretching frames 13 and 14 and the sewing part is stretched on the opening 19. These fabric- stretching frames 13 and 14 are longitudinally moved by longitudinal movement of a movable frame 6 and rotated so as to enable all round rotation by a stepping motor 23 joined to a spindle 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cloth stretching apparatus for sewing and holding a tubular work cloth around a cylindrical bed when sewing a work cloth such as a sock, a trouser or a hat. is there.

[0002]

2. Description of the Related Art A cloth upholstery of this type usually employs a cylindrical upholstered frame inserted into the outer peripheral side of a cylindrical bed. Conventionally, this cloth upholstery frame is formed with only one opening for extending a sewing portion of a tubular work cloth. For example, when embroidering both side surfaces of a sock, each side surface must be closed. It was necessary to re-stretch the two openings.

[0003] The applicant of the present invention has previously arranged at least two openings in a cylindrical upholstery frame in the circumferential direction, and each opening is selectively arranged above the needle drop hole of the cylindrical bed. As a result, a cloth stretching apparatus in which a cloth frame is configured to be rotatable has been proposed (JP-A-6-257059). According to this cloth stretching apparatus, embroidery processing can be continuously performed on two or more sewing sites without re-stretching the tubular work cloth.

[0004]

However, also in this cloth stretching apparatus, since the openings are discontinuous (non-opening), the entire circumference of the cylindrical work cloth is formed, for example, in an annular or spiral shape. Could not be sewn continuously.

SUMMARY OF THE INVENTION An object of the present invention is to provide a sewing machine upholstering apparatus which is capable of rotating a cylindrical work cloth so as to be rotatable all around the circumference so that the entire circumference of the sewing area can be freely and continuously and intermittently sewn. To provide.

[0006]

In order to solve the above-mentioned problems, a cloth stretching apparatus for a sewing machine according to the present invention comprises: a pair of cylindrical cloth-covered frames on which a cylindrical work cloth is covered; A support mechanism that rotatably supports the outer periphery of the mold bed and at the front and rear positions of the needle drop holes at an interval from each other, and a drive mechanism that synchronously rotates the two upholstered frames so that they can move back and forth and rotate around the entire circumference. In addition, substantially the entire circumference of the space between the two fabric tension frames is provided as an opening for extending a sewing site of the tubular work cloth.

Here, the supporting mechanism includes at least two support shafts that enter inside the two upholstery frames, and a pair of rollers provided on each support shaft and rolling on the inner peripheral surface of each upholstery frame. Alternatively, a structure including a pinion can be exemplified.

The cloth stretching apparatus of the present invention is applicable to both embroidery sewing machines and sewing machines other than embroidery sewing machines. In the case of an embroidery sewing machine, a drive frame is usually provided for feeding a work cloth to the front, rear, left and right directly or via an embroidery frame. Therefore, the drive mechanism may use at least the forward and backward movement of the drive frame. preferable.

In this case, the drive mechanism may include a motor coupled to at least one of the support shafts.

Alternatively, the drive mechanism may include a conversion means such as a wire, a timing belt, a rack, and a pinion for converting the left and right movement of the drive frame into the rotation of the upholstered frame.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Several embodiments of the present invention applied to an upholstery device for an embroidery sewing machine will be described below with reference to the drawings.

First, FIGS. 1 to 3 show a first embodiment of an upholstery device for an embroidery sewing machine. In this embroidery sewing machine, a needle 1 is provided at the tip of an embroidery head (not shown) so as to be able to move up and down, and a tubular bed 2 is projected below the embroidery head. A needle plate 4 having a needle drop hole 3 is provided on the upper surface of the distal end portion of the cylindrical bed 2, and a shuttle 5 is disposed inside the cylindrical bed 2 below the needle plate 4. A drive frame 6 is mounted on a table (not shown) of the embroidery sewing machine, and feeds back and forth and left and right to the work cloth directly or through the embroidery frame during normal embroidery sewing.

At the time of embroidering a tubular work cloth W such as a sock or the like, an exclusive upholstering device 11 is mounted on the drive frame 6. The upholstering device 11 includes a substrate 12 attached to the drive frame 6 in a forward-hanging manner, and a pair of cylindrical upholstery frames 13 and 14 on which the cylindrical work cloth W is covered. Both upholstered frames 13, 14
Have the same outer diameter and inner diameter.

The substrate 12 has three arrays arranged at intervals of 120 degrees.
The support shafts 15, 16, 17 are rotatably mounted on the shafts. The three support shafts 15, 16, 17 extend forward and enter the insides of the two upholstered frames 13, 14, and each of the support shafts 15, 16, 1, 1
A pair of rollers 18 that roll on the inner peripheral surfaces of the upholstered frames 13 and 14 are provided on the upper surface 7. Three spindles 1
The front ends of the members 5, 16 and 17 are rotatably mounted on the spacing plate 26 so as to prevent bending and are held parallel to each other. When the rigidity of the support shafts 15, 16, 17 is high, the spacing plate 26 may be omitted.

The support shafts 15, 16, 17 and the roller 1
8 and an interval holding plate 26, and a pinion 22 with a flange 22a and an engagement of an internal gear 21 which will be described later,
3 and 14 are constituted, and both upholstered frames 13 and 14 are provided.
Are rotatably supported on the outer peripheral side of the cylindrical bed 2 and at the front and rear positions of the needle drop hole 3 at predetermined intervals. The two support shafts 15 and 16 may be fixed to the substrate 12 and the roller 18 may be rotatably mounted on the support shafts 15 and 16.

The cylindrical work cloth W is fastened to both the upholstered frames 13 and 14 using a holder 25 such as a clamp or a band.
In the present embodiment, the entire circumference of the space between the two fabric tension frames 13 and 14 is an opening 19 for stretching a sewing site of the tubular work cloth W.

Each of the upholstered frames 13, 14 has an internal gear 21 on the inner periphery of the rear end. And one (tubular bed 2
A pinion 22 meshing with each of the internal gears 21 is provided on the support shaft 17 (below), and the pinion 22 engages with both side surfaces of the internal gear 21 to position the flanges 13 and 14 in the front-rear direction. A portion 22a is formed. A stepping motor 23 is mounted on the back surface of the substrate 12.
A support shaft 17 is connected to 3.

These drive frame 6, support shaft 17, and internal gear 2
1, a drive mechanism is constituted by the pinion 22 and the stepping motor 23. The cloth tension frames 13 and 14 are moved back and forth in synchronization with the movement of the drive frame 6 in the front-rear direction, and via the support shaft 17, the pinion 22 and the internal gear 21 with the rotation of the stepping motor 23. Upholstered frame 1
3 and 14 are rotated so as to be rotatable all around. The moving amount of the drive frame 6 and the rotating amount of the stepping motor 23 are each program-controlled based on the embroidery data.

When the tubular work cloth W is embroidered and stitched by using the upholstery device 11 having the above structure, the tubular work cloth W is attached to the upholstery frame 1.
The sewn portion is put on the opening 19 while the entire periphery of the sewn portion is floating in the space. In this state, when the sewing machine is started, the drive frame 6 is driven in the front-rear direction to feed the cylindrical work cloth W back and forth, and the cylindrical work cloth W is rotated by the reciprocating rotation of the stepping motor 23. The needle 1 and the shuttle 5 cooperate to form an embroidery stitch at the sewing site. At this time, if the cylindrical work cloth W is rotated over the entire circumference by the stepping motor 23 via the upholstered frames 13 and 14, a desired embroidery pattern such as an annular or spiral shape is continuously and intermittently formed over the entire circumference. It can also be formed freely. Of course, embroidery processing can be easily performed only on both side surfaces of the cylindrical work cloth W. When the cloth spreading device 11 of the present embodiment is used, the drive frame 6 is not driven in the left-right direction, but is driven only in the front-rear direction.

FIG. 4 shows a modification of the upholstery device 11 of the first embodiment. Here, by dividing the three support shafts 15 to 17 at the rear end side and providing a detachable mechanism 20 such as a serration support shaft and a support shaft hole, the cloth tension frames 13, 1 are provided.
4 is detachable from the substrate 12. According to this configuration, the tubular work cloth W can be easily attached to the upholstered frames 13 and 14 at a location away from the sewing machine, or the tubular work cloth W can be replaced with the next one with the upholstered frames 13 and 14. Work efficiency can be improved.

FIGS. 5 and 6 show a second embodiment of the upholstery device of the embroidery sewing machine. In the upholstering device 31, the driving mechanism is configured to be able to rotate the upholstery frames 13, 14 forward and backward and to rotate around the entire circumference by using the movement of the drive frame 6 in both the front and rear and left and right directions. The stepping motor 23 is not required.

The substrate 32 of the cloth stretching apparatus 31 has a slider 33 at the center thereof. The slider 33 is engaged with a guide 34 fixed to the lower surface of the cylindrical bed 2 so that the substrate 32 moves in the front-rear direction with respect to the cylindrical bed 2. It is slidably supported. As in the first embodiment, a pair of upholstered frames 13, 1
4 are supported at a distance from each other at front and rear positions of the needle drop hole 3 via support shafts 15 to 17 and rollers 18.

On the upper surface of the drive frame 6, a long plate 3
6 is attached, and a block 37 is fixed to the front surface of the lower end of the substrate 32. Grooves 36a and 37a are formed on the relative surfaces of the plate 36 and the block 37, respectively, and a flange 38 that fits into the grooves 36a and 37a protrudes from the outer periphery of the rear end of the upholstered frame 14. A wire 40 is stretched below the plate 36 by two pins 39, and a part of the wire 40 is wound around the outer periphery of the rear end of the upholstered frame 14.

When using the upholstery device 31 of this embodiment, the drive frame 6 is driven in both front and rear and left and right directions. Then, as the drive frame 6 moves in the front-rear direction, the plate 36
Thereby, the upholstery frames 13 and 14 are moved back and forth together with the substrate 32. The movement of the drive frame 6 in the left-right direction is converted to the rotation of the rear upholstery frame 14 by the wire 40, and the rotation of the upholstery frame 14 causes the rotation of the upholstery frame 14 via the internal gear 21, the pinion 22 and the support shaft 17, The front upholstery frame 13 is also rotated so as to be rotatable all around in synchronization. Therefore, according to the cloth stretching device 31 of the present embodiment, the tubular work cloth W can be fed back and forth and right and left by an inexpensive drive mechanism that does not use a dedicated actuator such as a stepping motor, and the tubular work cloth W By rotating the entire circumference, the entire circumference can be freely embroidered.

In this embodiment, as in the modification of the first embodiment shown in FIG. 4, the upholstery frames 13, 14 can be configured to be detachable from the substrate 12.

FIGS. 7 and 8 show a third embodiment of an upholstery device for an embroidery sewing machine. In the upholstery device 51, the support mechanisms of the upholstery frames 13 and 14 are different from those of the first and second embodiments, respectively, and the drive mechanism is configured using the wire 40 as in the second embodiment.

Supporting cylinders 52 and 53 are inserted inside the upholstered frames 13 and 14, respectively, and the two supporting cylinders 52 and 53 are connected to each other by one connecting plate 54. Each support cylinder 5
2 and 53 and the upholstered frames 13 and 14 are
Are connected to each other by removably fitting a plurality of small holes 56 provided in the upholstered frames 13 and 14, so that the support cylinders 52 and 53 are connected to the upholstered frames. 1
The needles 3 and 14 are supported at predetermined intervals in front and rear positions of the needle drop hole 3. Then, the two upholstered frames 13, excluding the connecting plate 54,
Substantially the entire circumference of the interval between the openings 14 is an opening 19 for extending a sewing site of the tubular work cloth W.

In this embodiment, the grooves 36a, 3a of the plate 36 and the block 37 are formed on the outer periphery of the rear end of the support cylinder 53 on the rear side.
A flange 38 that fits into 7a protrudes. Also,
The wire 40 is wound around the outer periphery of the rear end of the support cylinder 53. Therefore, the upholstery frames 13, 14 and the support cylinders 52, 53
As the drive frame 6 moves in the front-rear direction, it is integrally moved back and forth by the plate 36, and is rotated integrally by the wire 40 as the drive frame 6 moves in the left-right direction.

At the time of sewing the entire circumference of the cylindrical work cloth W, the connecting plate 5
When 4 reaches the position near the needle 1, the operation of the sewing machine is temporarily stopped. Then, when the sewing portions of the tubular work cloth W are held at the fixed positions at that time, for example, when the cloth upholstery frames 13 and 14 are grasped by hand or the like, only the inner support cylinders 52 and 53 have the protrusions 55 and the small holes. It is rotated with a torque that exceeds the mating force with 56. At this time, after the protrusion 55 comes off from the small hole 56 and the connecting plate 54 is advanced to a position where it does not interfere with the needle 1,
The projection 55 fits into the next small hole 56. Then, the operation of the sewing machine is restarted, and the cylindrical work cloth W
Embroidery processing is continued on the sewing site of. Therefore, even with the cloth tensioning device 51 of the present embodiment, the cylindrical work cloth W can be rotated so as to be rotatable all around, and the entire circumference can be embroidered freely.

The present invention is not limited to the above embodiments, but can be embodied with appropriate modifications without departing from the spirit of the present invention, for example, as follows. (1) In the first or second embodiment, the shafts 15, 1
Change the number of 6, 17 in the range of about 2 to 8. (2) In the first or second embodiment, the roller 18 is omitted, and the number of pinions 22 that mesh with the internal gear 21 is increased. (3) In the third embodiment, the coupling means between the upholstery frames 13, 14 and the support cylinders 52, 53 is changed from the engagement between the projection 55 and the small hole 56 to the groove and the engagement projection engaged therewith. Change to a combination of.

[0031]

As described above in detail, according to the cloth stretching apparatus of the present invention, the stretched cylindrical work cloth is rotated so as to be rotatable all around, and the entire circumference of the sewing portion is continuously formed. It has an excellent effect that it can be sewn freely even intermittently.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a cloth stretching apparatus according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the upholstering device.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

FIG. 4 is a side view showing a cloth stretching apparatus according to a modification of the first embodiment.

FIG. 5 is a sectional view showing a cloth stretching apparatus according to a second embodiment of the present invention.

FIG. 6 is a sectional view taken along line VI-VI of FIG. 5;

FIG. 7 is a cross-sectional view illustrating a cloth stretching apparatus according to a third embodiment of the present invention.

FIG. 8 is a sectional view taken along line VIII-VIII of FIG. 7;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 needle 2 cylindrical bed 3 needle drop hole 6 drive frame 11 cloth stretching device 12 substrate 13 cloth stretching frame 14 cloth stretching frame 15 support shaft 16 support shaft 17 support shaft 18 roller 19 opening 21 internal gear 22 pinion 23 stepping motor 31 Clothing device 32 Substrate 40 Wire 51 Clothing device 52 Support cylinder 53 Support cylinder 54 Connecting plate W Cylindrical work cloth

Claims (5)

[Claims] 1. A pair of tubular upholstery frames on which a tubular work cloth is placed, and both upholstery frames are rotatable on the outer peripheral side of the cylindrical bed and at positions before and after the needle drop hole with an interval therebetween. A supporting mechanism for supporting, and a drive mechanism for synchronizing the two upholstery frames and rotating them so as to be able to move back and forth and rotate around the entire circumference are provided. An upholstery device for a sewing machine, comprising an opening for stretching. And a pair of rollers provided on each of the support shafts and rolling on the inner peripheral surface of each of the upholstery frames. The sewing machine upholstery according to claim 1, further comprising a pinion. 3. The sewing machine is an embroidery sewing machine, and the drive mechanism uses at least a forward and backward movement of a drive frame provided for the embroidery sewing machine to feed a work cloth back and forth and left and right. Sewing machine upholstery equipment. 4. The upholstery machine according to claim 3, wherein the driving mechanism includes a motor coupled to at least one of the support shafts. 5. The cloth stretching apparatus for a sewing machine according to claim 3, wherein the driving mechanism includes means for converting a left-right movement of the driving frame into a rotation of the cloth tension frame.