JPH0733740Y2 - Cloth guide for tight sewing of overlock sewing machines - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of the Invention [0001] This invention relates to a cloth guide for tight sewing of an overlock sewing machine, and particularly to an effective cloth guide when performing tight sewing in an overlock sewing machine with an automatic back tack device. Is provided.

2. Description of the Related Art When performing overlock sewing using an overlock sewing machine, an empty ring that is continuously formed at the end of sewing of the cloth that has already been sewn is automatically cut by a knife and is connected to the needle plate claw. The cut end of is sewn and held to the front side of the needle drop, and when sewing the newly supplied cloth, the held empty ring is sewn into the overedging stitch at the start of sewing, so that the thread end is frayed. It has been done for a long time to prevent this, and many so-called automatic backtack devices that automatically do this have been proposed, including Japanese Examined Patent Publication No. 43-16095.

On the other hand, the overlock sewing machine is widely used for knitted products such as knitted underwear and general overedging, and is also used for sewing sleeves of long-sleeved undershirts, for example. When sewing this long-sleeved undershirt, the rubber knitted fabric for the cuffs is usually knitted with a constant width, so when forming it into a tubular shape, the stitching part of the sewing machine does not use the knife of the overlock sewing machine. Overlocking sewn with overlocking width is applied only, and the sleeve portion of the body material is overedged with a predetermined width while cutting off the edge of the cloth with a knife. When performing this sewn stitch, as shown in FIG. 3, the cloth guide is provided on the needle plate 3 between the knife action line C on the front side of the upper and lower knives 1 and 2 and the sewing line S so that the left and right positions can be adjusted. 4 is installed and the right side edge of the rubber knitted fabric is brought into contact with the left side surface of the cloth guide 4 to set the width of the sewn stitch and prevent the side edge portion of the rubber knitted fabric from being cut.

The problem to be solved by the invention is, for example, in the case of using a sewing machine with an automatic back-tacking device as described in Japanese Patent Publication No. 43-16095, make sure that an extra empty ring is cut with a knife for cutting the fabric edge. However, if the ruler 4 is installed to perform tight sewing, not only the sleeve rubber knitted fabric but also the extra empty ring cannot be cut, and as a result, the long empty loop is sewn in. There was a problem that the product became bulky and the finished product did not look good.

Therefore, an object of the present invention is to provide a cloth guide for sewn sewing of an overlock sewing machine capable of performing sewn sewing without cutting the cloth edge portion and cutting an extra empty ring.

Means for Solving the Problems That is, the cloth guide of the present invention cuts the right edge of the cloth immediately before sewing by slidingly contacting the lower knife installed on the front right side of the needle drop portion of the needle plate and the lower knife by vertical movement. In the overlock sewing machine having the upper knife, the ruler for guiding the right side edge of the cloth having a guide surface between the sewing line of the sewing machine and the upper knife is arranged on the needle plate, and the upper knife is provided. A space is provided between the lower edge of the guide surface on the front side and the side of the needle plate and the needle plate.

The ruler can be attached to the machine frame of the sewing machine, the bed or the presser foot of the sewing machine so that the left and right positions can be adjusted according to the desired wrapping width, or when unnecessary, for example when performing overlock sewing, a manual or drive member is used. It is possible to retract the upper knife further rightward or upward through the position.

In addition, the ruler is installed with the lower edge along the needle plate, but if it is on the front side from the upper female side part, an empty ring can pass between the lower edge of the ruler and the needle plate surface. The narrow gap is provided, and the size of the gap and the front-rear positional relationship with the upper knife can be appropriately set according to the cloth to be sewn.

Effect When the overlock sewing machine having the cloth guide of the present invention is used to perform the sewn sewing, the right edge of the cloth is not guided by the ruler and the cloth edge is not cut, and the sewn stitch with a good width is provided. You can

If the empty ring connected to the end of sewing is turned to the front side and guided further to the right side from the gap between the ruler and the needle plate, it can be cut by the upper and lower knives.

Further, in the overlock sewing machine with the automatic back tack, the extra long portion of the empty ring sewn at the sewing start end of the sewn stitch can also be cut by the upper and lower knives by guiding it to the right from the gap.

Embodiment An embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, this cloth guide is provided with a ruler 6 having a cloth guide surface 5 along the cloth feed direction of the sewing machine, and the lower edge of the cloth guide surface 5 contacts the upper surface of the claw 8 of the needle plate 7. I am trying. The contact portion is the needle drop portion, that is, the line of action N of the sewing machine needle 9 and the needle plate groove.
A space 13 is formed between the point slightly intersecting with 10 (Fig. 2) to the middle of the cloth cutting action parts of the upper and lower knives 11 and 12, and on the front side from the point of intersection with the upper surface of the needle plate 7. Notched to do.

Further, this ruler 6 has its cloth guide surface 5 arbitrarily adjusted between the left and right sides of the upper and lower knives 11 and 12 and the sewing machine needle 9 by adjusting the left and right positions by the mounting long hole 14 and the screw 15. I am able to set it.

In addition, this embodiment is applied to an overlock sewing machine having an automatic back tack device, and is provided with an empty ring moving device (not shown) for moving the empty ring T connected to the needle plate claw 8 to the front side. As a device for capturing the empty ring T, an empty ring holding portion 16 is provided on the front right side of the needle plate 7. The empty ring sandwiching portion 16 includes a first sandwiching plate 17 and a second sandwiching plate 17.
The first holding plate 17 is separated and pressure-contacted to the second holding plate 18 by a driving member (not shown), so that the empty ring can be held between them.

Further, the sandwiching portion 16 is pivotally attached to the pin 19 so as to be kept in close contact with the needle plate 7 in a normal sewing operation and can be rotated to the right position shown in FIG. 2 during the back tack operation. . In addition, in FIGS. 2 and 3, 20
Is a feed dog and 21 is a presser foot.

With such a configuration, when performing tight stitching, when cloth such as rubber knitted fabric is supplied onto the needle plate 7 along the ruler 6 and the sewing machine is driven, the cloth has a knife 11, whose right end is at the upper and lower ends. It is possible to perform a sewn stitch of a predetermined width without being cut into 12.

Further, when performing back tack, the empty ring T brought to the near side sandwiching portion 16 by the empty ring moving device was inserted between the first and second sandwiching plates 17 and 18 by means such as air blowing. When it is pinched later and the pinching part 16 is rotated clockwise, the middle part of the empty ring T passes through the space 13 between the cloth guide surface 5 of the ruler 6 and the needle plate 7 and the cloth of the lower knife 12 is inserted. Guided on the cutting action part. Then, the cloth is supplied onto the needle plate 7 in the same manner as described above, and when the sewing machine is started, the cloth moves forward along the ruler 6 due to the action of the feed dog 20 and the presser foot 21 and the cloth edge has a predetermined width without being cut. When the upper knife 11 descends and comes into sliding contact with the lower knife 12, the empty ring T is shortly cut and sewn into the seam of the sewn seam, and the back of the bag has a good appearance. Tuck stitches are formed.

The length of the empty ring T sewn into the seam of the sewn stitch can be adjusted by rotating the holding portion 16 in the clockwise direction after starting the sewing machine and changing the timing.

Further, the movement of the holding portion 16, the holding plates 17, 18 and the like may be appropriately selected such as rotation and linear movement.

As described above, according to the present invention, it is possible to perform tight sewing without cutting the cloth edge portion, and it is possible to cut an extra empty ring, and in particular, an overlock having an automatic back tack device. It has excellent effects when used in sewing machines.

[Brief description of drawings]

FIG. 1 is a side view showing a partial section of an essential part of an embodiment of the present invention, FIG. 2 is a perspective view thereof, and FIG. 3 is a plan view showing a conventional example. 5: cloth guide surface, 6: ruler, 7: needle plate, 8:
Nail, 9 ... Sewing needle, 10 ... Needle plate groove, 11 ... Upper knife, 12
...... Lower knife, 13 ...... void, S ...... Sewing line, T ...... empty ring

Claims (1)

[Scope of utility model registration request] 1. An overlock sewing machine having a lower knife installed on the right front side of the needle drop portion of the needle plate and an upper knife adapted to slide on the lower knife by vertical movement to cut the right edge of the cloth immediately before sewing. In the above, the ruler for guiding the right side edge of the cloth having a guide surface between the sewing line of the sewing machine and the upper knife is arranged on the needle plate, and the lower edge of the guide surface on the front side from the side portion of the upper knife. A cloth guide for tight sewing of overlock sewing machines, characterized in that a gap is provided between the needle and the needle plate.