JPS6020986Y2 - Device for stabilizing reverse stitching - Google Patents

Description

[Detailed explanation of the invention] When backstitching on an overclock sewing machine, this invention cuts from the previously sewn fabric and bends the ring residue into the backstitch part, and then uses the ring guide groove and stop pin to position it in its normal position. This invention relates to a device that is capable of stabilizing backstitching by guiding the overclocking stitch to the backstitch, and is also capable of backstitching without impairing the elasticity of the overclocked sewing part.

Conventionally, when backstitching on an overclock sewing machine, the loose ring residue that has been cut from the previously sewn fabric is bent into the sewing start seam of the next fabric to prevent fraying at the beginning of sewing. This is a so-called reverse stitch operation to prevent the thread from growing, but since the ring residue is a free end, it is not necessarily guided to the normal position and is reverse stitched, making it difficult to perform a stable and reliable reverse stitch. This has disadvantages in that the starting part of the sewing becomes irregular, and the part loses its elasticity because it is sewn under traction, which reduces the commercial value of the starting part.

However, in the present invention, a ring stop is provided between the ring guide groove 2, which has a ring residue formed on the surface of the throat plate 1, and the ring retainer plate 3 and the knife mount 4. pin 5
In order to prevent it from slipping out of the normal position, the ring residue is sewn in with reverse stitching when it passes through the abnormal position and is in a traction state, so there is no need to worry about the overclocking stitching in this area losing its elasticity. , the ring residue is bent in an extremely appropriate state during reverse stitching, and the beginning of the reverse stitch is reverse stitched in a good condition, which is highly effective in increasing the product value.

To explain in detail with reference to the accompanying drawings which show an example of the embodiment, reference numeral 1 shows a needle plate in a backstitch position of a known overclock sewing machine.

Reference numeral 2 denotes a ring guide groove formed on the surface of the throat plate 1 at a position where the ring residue should be normally guided.

3 is a known ring holding plate, 4 is a knife mount, and 5 is a ring stop pin installed in the gap between both 3 and 4 at a position where the ring residue should be guided normally. be.

The present invention has the above-described structure, and when the next sewing fabric is started to be sewn, when the empty ring residue comes into contact with the back side of the fabric,
Since this creates frictional resistance on the ring residue, the ring also tends to move forward while being in contact with the fabric as it progresses, so the pinching pressure of the ring pressing plate must be strong, and if it is too strong, the beginning of sewing will be pulled. Therefore, in order to eliminate this unstable element that causes contact friction, this corner part will be in a sagging state and the product value will be reduced. Since the ring residue 6 does not come into contact with the back side of the fabric and does not generate any frictional resistance, the ring residue yarn is correctly guided in the guide groove, allowing for stable and reliable backstitching.

Furthermore, when trying to cut the dregs continuous to the end of the previously sewn fabric 7 by turning them counterclockwise and guiding them to the knife 8, if the dregs jumps over the guide groove 2 and goes too far to the right, Even if the ring is not guided into the guide groove 2 to its normal position, there is a risk that it will be difficult.

In such a case, since the ring stop pin 5 is provided in the present invention, there is no danger that the ring will be pulled excessively to the right during cutting, and the ring will always come off from the ring guide groove 2. Without any fear, it is possible to stably and reliably perform reverse stitches by being guided to the normal position, and even at the beginning of reverse stitches, there is no loss of elasticity and there are no irregularities, making it highly effective as sewing with good commercial value can be obtained. be.

[Brief explanation of drawings]

The attached drawings show an example of this embodiment. Fig. 1 is a plan view of the main part, Fig. 2 is a front view of the main part, and Fig. 3 is a main part showing the relationship between the previously sewn fabric and this device. FIG. 1... Throat plate, 2... From ring guide groove, 3
・・・・・・ From ring presser plate, 4: Knife mount, 5: from ring stop pin, 6...
・Karan remaining thread, 7... Previously sewn fabric, 8------
--Knife.

Claims (1)

[Scope of utility model registration request] A reverse stitch characterized in that a hollow ring guide groove 2 is bored on the surface of a throat plate 1 of an overclock sewing machine, and a hollow ring stop pin 5 is interposed between a hollow ring pressing plate 3 and a knife mount 4. stability improvement device.