JPH0141399Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a fabric sagging prevention device in a sewing machine such as a quilting machine or an embroidery machine.

(Prior Art) Conventionally, in sewing machines such as quilting machines and embroidery machines, when the fabric is moved forward, the fabric formed by winding the fabric rotates excessively, causing the fabric to droop and wrinkle. To prevent this, a droop prevention device as shown in FIG. 6 was installed.

This fabric droop prevention device 1 includes a pulley 6 attached to one end of the shaft of a raw fabric 2 around which a fabric 4 is wound, and a weight 5 added along the groove of the pulley 6 to rotate the fabric 2. It was made to be heavier.

(Problem to be solved by the invention) However, with a sewing machine that uses a weight to increase the rotation of the fabric, such as the fabric droop prevention device, the fabric cannot be rotated with a constant force. Since the rotation of the fabric is heavy, it is difficult to accurately respond to changes in the weight of the entire fabric when the type of fabric being wound changes or the amount of fabric wound changes. Ta.

In addition, in quilting machines, etc., the feed roller 7 (Fig. 6) may be rotated in the opposite direction to return the fabric, and in such cases, the conventional weight-based fabric sag prevention device is unable to control the movement of the fabric and the feed roller. Misalignment occurred, and it was not possible to prevent the fabric from sagging.

This sagging of the fabric causes wrinkles in the fabric, causing problems such as the quilting pattern or embroidery pattern becoming misaligned or the fabric not being quilted.

The present invention has been developed in view of the above-mentioned points, and it is an object of the present invention to provide a fabric sagging prevention device for a sewing machine that can always accurately display a quilt pattern or an embroidery pattern on fabric.

(Means for Solving the Problems) That is, the means taken by the present invention is that the fabric is fed by a feed roller that rotates while sandwiching the fabric before and after sewing. A sagging prevention device comprising: a contact roller provided in contact with a raw fabric formed by winding an outer fabric; and a transmission means for operating the feed roller and the contact roller in synchronization. This is a device to prevent fabric from sagging in a machine.

(Function of the invention) As described above, the fabric sag prevention device of the invention has the following features:
Between the original fabric and the feed roller before sewing,
The fabric is sandwiched between the feed rollers and between the web and the contact roller. Further, the feed roller and the contact roller are operated synchronously by a transmission means. Therefore, the contact roller rotates while maintaining the same amount of movement as the amount of movement of the fabric by the feed roller, and the fabric between the feed roller and the contact roller is held with the initially determined constant tension. Therefore, the fabric does not sag.

(Embodiment) The present invention will be described in detail below according to an embodiment shown in the drawings.

Fig. 1 is a front view showing an example in which the fabric sag prevention device of the present invention is applied to a quilting machine, Fig. 2 is a perspective view showing the fabric sag prevention device in the quilting machine of Fig. 1, and Fig. 3 is the same. FIG.

As shown in FIGS. 1 to 3, in this quilting machine 10, a pair of feed rollers are arranged before sewing, and three feed rollers are arranged after sewing. The fabric is sandwiched between each of these feed rollers.
The fabric is fed in the front and back direction by the rotation of these feed rollers. Further, behind the feed roller before sewing, on the rear surface of the upper part of the quilting machine 10, a first fabric 12 with a outer material 17 wound thereon is provided in the left-right direction, and a first fabric 12 is provided below so as to be in contact with the first fabric 12. A first contact roller 14 is provided. Further, on the rear surface of the lower part of the quilting machine 10, there is a second
A raw fabric 13 is provided in the left-right direction, and this second raw fabric 1
3 is in contact with the second contact roller 15 below.
is provided. Feed roller 30, first contact roller 14 and second contact roller 1 before sewing
On one side of 5, the rotation of the feed roller 30 is transmitted to the first contact roller 14 and the second contact roller 15 so that the feed roller 30 and the first contact roller 1
4 and the second contact roller 15 are provided.

As shown in FIGS. 1 to 3, the first contact roller 14 is a roller provided in the left-right direction on the upper rear surface of the quilting machine 10, and has a grid pattern on its surface to increase the frictional force with the fabric 19. A groove 20 is formed. Instead of this groove 20, a non-slip member such as rubber may be attached. A support 22 with two bearings 21 is installed on both sides of the rear surface of the quilting machine 10, and a shaft 23 protruding to the side of the first roller 14 is attached to the upper bearing 21 of this support 22. A contact roller 14 is rotatably supported. The first raw fabric 12 is placed on top of the first contact roller 14 and comes into contact with the first contact roller 14 due to its own weight. Further, on the upper bearing 21 of the support column 22, a U-shaped shaft restraint is provided to prevent front and rear displacement of the shaft 24 that protrudes to the side of the first fabric 12 around which the outer material 17 is wound. A member 25 is attached. Then, from the first raw fabric 12 to the outer fabric 1
7 is pulled out and the diameter of the first web 12 becomes smaller, its shaft 24 processes the inside of the shaft restraining member 25, and the first web 12 is brought into contact with the first collision roller 14. They are designed to always remain in contact with each other through the fabric to be sewn. A second contact roller 15 is provided below the first contact roller 14 .

As shown in FIGS. 1 to 3, the second contact roller 15 is a roller provided in the left-right direction on the lower rear surface of the quilting machine 10, and has a grid pattern on its surface to increase the frictional force with the fabric 19. A groove 20 is formed. Bearing 21 at the lower stage of the support column 22
, a shaft 2 protruding laterally of the second contact roller 15 is provided.
6 is attached, and a second contact roller 15 is rotatably supported. A second raw fabric 13 with a lining 18 wound thereon is placed on the second contact roller 15, and is brought into contact with the first roller 14 due to the weight of the second raw fabric 13. This second raw fabric 13 is similar to the first raw fabric 12 described above, and the support 2 is
The shaft 27 is inside the shaft restraining member 25 attached to the shaft 27.
is restrained, and as the lining 18 is pulled out from the second raw fabric 13 and the diameter of the second raw fabric 13 becomes smaller, its shaft 27 processes the inside of the shaft restraining member 25. The two original fabrics 13 are always kept in contact with the second contact roller 15 via the fabric to be sewn.

As shown in FIGS. 1 to 3, the transmission means 16 is a feed roller 3 that rotates while sandwiching the fabric before sewing.
0, first contact roller 14 and second contact roller 15
It consists of toothed pulleys 28 attached to one side (right side in this embodiment) and a toothed flat belt 29 hooked around these toothed pulleys 28. One toothed pulley 28 is attached to the shaft 23 protruding to the right side of the first contact roller 14, and the other toothed pulley 28 is attached to the second toothed pulley 28.
It is attached to a shaft 36 of a gear that meshes with a gear 35 fixed to a shaft 26 projecting to the right side of the contact roller 15. Furthermore, one toothed pulley 28
is the rear end of the quilting machine 10, which operates in synchronization with the feed roller 30 before sewing (and the feed roller 31 after sewing, which moves the fabric 19 forward and backward, and moves the fabric 19 while applying a constant tension to the fabric 19). A shaft 33 that protrudes to the right of a roller (a roller installed in the left-right direction) that rotates forward and reverse intermittently in accordance with the upward and downward movements of the upper needle 32 under the support of an NC control device (not shown). The line connecting these pulleys 28 is perpendicular to the axes of the first contact roller 14, second contact roller 15, and feed roller 30. A toothed flat belt 29 is hung around each of the toothed pulleys 28 provided in this manner, and is also perpendicular to the axes of the first contact roller 14, second contact roller 15, and feed roller 30. The first contact roller 14 and the second contact roller 15 are configured to rotate forward and reverse in the same direction as the feed roller 30 rotates forward and reverse in the same direction before sewing. In this case, the first contact roller 14 and the second
The contact roller 15 rotates forward and reverse while maintaining the same amount of movement as the amount of movement of the fabric 19 by the feed roller 30. Therefore, when the feed roller 30 rotates normally and reversely and the fabric 19 moves forward and backward, the first contact roller 14 and the second contact roller 15 also maintain the same amount of movement as the amount of movement of the fabric 19 by the feed roller 30. The first raw fabric 12 and the second raw fabric 13 that are in contact with these rollers 14 and 15 are rotated in the forward and reverse directions, and the first fabric 12 and the second fabric 13 that are in contact with these rollers 14 and 15 form the outer fabric 17 or the lining 1.
The cloth 19 rotates while maintaining the same amount of movement of the cloth 19 by the feed roller 30 in the direction of pulling out the cloth 8 and the direction of winding it, so that the cloth 19 does not become loose or sag.

Note that the transmission means 16 is not limited to the toothed pulley 28 and the toothed flat belt 29, but may be composed of a sprocket and a chain.

Further, the transmission means 16, as shown in FIG.
A toothed pulley 28 attached to the main shaft of a servo motor 34, which is a drive means independent of the drive means of the feed roller 30, and the first contact roller 14.
It consists of a toothed pulley 28 attached to the second contact roller 15 and a toothed flat belt 29 hooked around these toothed pulleys 28, and simultaneously rotates the first contact roller 14 and the second The two contact rollers 15 may be operated synchronously to rotate forward and reverse.

In addition, in the above-mentioned embodiment, the fabric droop prevention device 1 in the quilting machine of the present invention has been described.
1 is provided in the quilting machine 10 that moves the fabric forward and, if necessary, moves it backward to quilt the fabric, but the present invention is not limited to this. It may also be provided in a quilting machine.

FIG. 5 is a side view showing an example in which the fabric sagging prevention device of the present invention is applied to an embroidery machine.

In this embroidery machine 40, the fabric 4 to be embroidered is
A raw fabric 42 wound with 6 is provided in the left-right direction, and a contact roller 43 is provided below so as to be in contact with this raw fabric 42. A transmission means is provided on one side of the contact roller 43 for transmitting power to the contact roller 43 and causing the contact roller 43 to operate synchronously. The transmission means is on one side of the feed roller 47 and the contact roller 43 (in the case of this embodiment, on the right side)
It consists of toothed pulleys 44 attached to the toothed pulleys 44 and a toothed flat belt 45 hung around these toothed pulleys 44. Among them, one toothed pulley 44 is attached to a shaft protruding to the right side of the contact roller 14, and the other toothed pulley 44
is a feed roller 47 (an upper needle 49 of the embroidery machine 40 that operates synchronously with the feed roller 48 to move the fabric 46 while applying a constant tension to the fabric 46).
It is attached to a shaft that protrudes to the right of the roller (which rotates forward intermittently in accordance with the vertical movement of the roller).

Therefore, when the feed roller 47 rotates normally, the contact roller 43 operates synchronously in the same direction. The contact roller 43 is configured to rotate while maintaining the same amount of movement as the amount of movement of the fabric 46 by the feed roller 47. Therefore, when the feed roller 47 rotates forward and moves the fabric 46 forward, the contact roller 43 also rotates while maintaining the same amount of movement as the fabric 46 due to the feed roller 47, and the contact roller 42 rotates in the direction of pulling out the fabric 46 while maintaining the same amount of movement as the amount of movement of the fabric 46 by the feed roller 47, so that the fabric 46 does not flop or sag.

(Effect of the invention) As detailed above, in the fabric droop prevention device of the sewing machine of the present invention, the contact roller in contact with the original fabric maintains the same amount of movement of the fabric as the feed roller. Because it rotates, the fabric that is pulled out from the original fabric is held at a predetermined constant tension.

Therefore, the fabric before sewing does not sag, and a quilt pattern or embroidery pattern of a predetermined shape can always appear on the fabric.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the fabric droop prevention device according to the present invention applied to a quilting machine, Fig. 2 is a perspective view thereof, Fig. 3 is a side view thereof, and Fig. 4 is a quilting machine. FIG. 5 is a side view showing another embodiment of the fabric droop prevention device according to the present invention applied to an embroidery machine; FIG. , FIG. 6 is a perspective view of a conventional fabric sagging prevention device. Explanation of symbols, 11...Fabric droop prevention device (in a quilting machine), 12...First original fabric, 13...Second original fabric, 14...First contact roller, 15...Second contact roller, 16... Transmission means, 28... Toothed pulley, 29... Toothed flat belt, 41... Fabric droop prevention device (in embroidery machine), 42... Original fabric, 43... Contact roller.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A device for preventing drooping of fabric in a sewing machine configured so that the fabric is fed by a feed roller that rotates while sandwiching the fabric before and after sewing, which includes: What is claimed is: 1. A device for preventing drooping of fabric in a sewing machine, comprising: a contact roller disposed in contact with a raw fabric formed by winding a feed roller; and a transmission means for operating the feed roller and the contact roller synchronously. (2) Utility model registration claim No. 1 characterized in that the transmission means consists of a toothed pulley attached to one side of a contact roller and a feed roller, and a toothed flat belt hung around these toothed pulleys. A device for preventing drooping of fabric in a sewing machine according to item 1.