JPH0540876Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The invention is based on the invention: after the end of sewing, an empty ring connected to the sewing machine needle is passed from the sewing end of the fabric between the support plate and the presser plate in front of the throat plate, and This invention relates to an empty ring holding/cutting device for an overlock sewing machine that cuts and holds the ring using a knife provided in the overlock sewing machine.

Prior Art As a method to prevent the seams from fraying at the beginning of sewing of fabric sewn with an overlock sewing machine,
As shown in the figure, a support plate 4 is fixed on the bed in front of the throat plate 1, and a presser plate 5 is in elastic contact with the support plate.
and a built-in knife 17. After the sewing is finished, the empty ring connected to the sewing machine needle is passed from the sewing end of the fabric between the support plate 4 and the presser plate 5, and the knife is removed. After cutting in step 17, keep the cut end of the empty ring connected to the needle as it is, feed a new cloth in this state, and as you start sewing, insert the held empty ring into the seam. There is a way to sew it in (Utility Model Publication No. 56-44669).

In the conventional empty ring holding and cutting device described above, the holding plate 5 is pivotally supported by a rotation-stopping bolt passed through the holding plate 5 and the support plate 4, so that it can rotate horizontally. It is pressed onto the support plate by a coil spring 12 attached to the bolt 9 between the support plate 4 and a nut 11 screwed onto the end of the bolt protruding from the support plate 4, and the pressing force is equal to the force of the nut 11. Adjustment can be made by changing the screwing amount.

In addition, the knife holder is made by cutting out the support plate 4 and installing a knife holder in the notch, inserting the knife vertically into the slot formed in the holder, and tightening it with a screw from the horizontal direction. In order to enable rotational operation of the retainer, the retainer can be avoided upwardly from within the notch.

Problems to be Solved by the Invention The conventional ring holding and cutting device described above has some points that are desired to be improved.

One of the problems is that the nut that adjusts the pressing force of the presser plate tends to loosen and the pressing force becomes weak.

Another problem is that since the tightening screw of the knife is oriented horizontally, the structure of the knife holding part is complicated and the knife replacement work is also complicated.

The first objective of the invention is therefore to prevent the nut from loosening and to prevent the adjusted pressing force from changing.

The second object of the present invention is to simplify the scalpel holder, simplify the scalpel replacement work, and enable the knife to be reliably attached regardless of its thickness.

Means for solving the problem and its operation The empty ring holding and cutting device for achieving the first objective consists of a support plate fixed on the bed in front of the throat plate, a presser plate placed on the support plate, and a support plate. and a bolt that is passed through the holding plate to prevent rotation and pivotally supports the holding plate, a nut that is screwed onto the protruding end of the bolt that projects from the supporting plate, and a bolt that is attached to the bolt between the nut and the supporting plate, It consists of a coil spring that presses the presser plate against the support plate, and a knife that cuts the empty ring that is installed between the support plate and the presser plate and is inserted between the two plates. An empty ring holding and cutting device for an overlock sewing machine in which an empty ring connected to a needle is passed between a support plate and a presser plate, cut with a scalpel, and the cut end of the empty ring connected to the needle is held by the support plate and the presser plate, A slotted groove is formed in the bolt, and one end of the coil spring is bent and passed through the slotted groove, and the end protruding from the slotted groove is connected to the engagement surface provided radially at regular intervals in the circumferential direction of the nut. It is designed to be removably locked in the stop groove.

According to this device, the bent portion of the coil spring is passed through the slotted groove of the bolt that is prevented from rotating, and the end protruding from the slotted groove is locked in the locking groove of the nut, so that the rotation of both the spring and the nut is prevented. A stop is made.

The pressing force exerted by the holding plate is adjusted by turning a nut, and when the nut is turned, the coil spring expands and contracts, but at this time, the corners of the slotted groove and the bent corners of the coil spring are particularly likely to get caught. In order to solve this problem, it is desirable to cut the slotted groove so that both ends thereof preferably become parallel surfaces.

When the nut is turned to change the presser pressure by the presser plate, the bent part passes through the slotted groove, which prevents the coil spring from rotating, and the bent end is in elastic contact with the locking groove, so the nut is rotated through the locking groove. It rotates a certain amount at the pitch of. The amount of rotation becomes smaller as the pitch of the locking groove is made smaller, and fine adjustment becomes possible.

In order to achieve the second object, in the empty ring holding and cutting device of the overlock sewing machine, a knife mounting groove is formed in the support plate, and a U-shaped latch with a tapered inner surface is fitted into the groove. A knife with a blade on the side is placed in the groove and held down with a latch, and by screwing in a countersunk screw connected to the tapered surface, the knife is tightened between the latch and the side of the groove. is provided with a groove on its lower surface into which a female protruding from the support plate fits.

According to this device, when the countersunk screw is screwed in while connected to the tapered surface of the latch, the latch moves and presses and fixes the scalpel against the side surface of the groove.

Embodiment FIG. 2 shows an empty ring holding and cutting device 2 installed in front of the throat plate 1 of an overlock sewing machine.
As shown in detail in FIG. 1, the device 2 includes a support plate 4 fixed to the bed of a sewing machine (not shown) by a pair of set screws 3, and a needle mounted on one side of the support plate 4. A holding plate 5 flush with the plate 1, and bolts 9 passed through fitting holes 7 formed in depressions 6 at corners of the holding plate and fitting holes 8 formed at corners of the support plate 4, respectively.
, a nut 11 that is screwed onto the protruding end of the bolt 9 that protrudes downward from the support plate 4 , and a coil spring 1 that is attached to the bolt 9 between the support plate 4 and the nut 11 .
2, a U-shaped latch 15 that fits into the groove 13 formed on the upper surface of the support plate 4 and has a tapered surface 14 formed on the inside, and the groove bottom of the groove 13 while being joined to the tapered surface 14 of the latch 15. A countersunk screw 16 that is screwed into the
It consists of a knife 17 which is held between the latch 15 and the groove side surface 13a and has a blade 17a formed on one side, and the bolt 9 is prevented from turning by cutting off one side of the head and joining it to the side surface of the recess 9. A slotted groove 18 is formed in the threaded portion, and a slotted groove 1
Both ends of 8 are cut off to form vertically parallel flat surfaces 19.

The coil spring 12 has a bent portion 21 bent in the diametrical direction at its lower end, and the end portion is connected to the nut 1.
1 is adapted to engage with the grooves of an annular engaging portion 22 formed with grooves at regular intervals in the circumferential direction.

In FIG. 1, 4a is a groove for smoothing the sliding of the empty ring, and 5a is a female attachment groove 13 of the support plate 4.
This is a groove into which a female 17 protruding upward from the cross plate is fitted, and 23 shown in FIG. .

This device is constructed as described above, and when cutting the empty ring connected to the needle from the sewn product after sewing, the empty ring 25 is pulled out from the claw 1a of the throat plate 1, pulled out toward the front, and the empty ring is removed from the cross plate 23. and the presser plate 5, and move it to the right in Fig. 2. The empty ring is the left edge of the knife 17
When the empty ring is pulled to the right after reaching 7a, it is bent and cut at the cutting edge 17a. An empty ring connected to the needle at the time of cutting is formed on the needle plate 1,
A groove 1 extending from the needle hole 1b toward the cutting edge of the scalpel 17
Get stuck in c. The cut end is held between the support plate 4 and the presser plate 5.

When a new cloth is supplied and sewing is started, the empty ring held between the support plate 4 and the presser plate 5 is gradually sewn into the seam as the cloth is sewn in.

Effects of the Invention The empty ring holding and cutting device of the present invention is constructed as described above, and has the following effects.

According to the device according to claim 1, the coil spring is prevented from rotating by passing the bent portion through the slotted groove of the bolt to be prevented from rotating, and the coil spring is prevented from rotating by passing the bent portion through the slotted groove of the bolt to be prevented from turning. By locking the locking groove, the nut is prevented from rotating, the nut is prevented from loosening, and the pressing force of the presser plate can be maintained constant.

In the device according to claim 2, the coil spring, which expands and contracts as the nut is rotated, is no longer caught on the threaded portions at both ends of the slotted groove, so that the spring can be smoothly expanded and contracted, and the presser foot collapse can be adjusted. It can be done smoothly.

According to the device according to claim 3, the knife can be firmly attached by simply fitting the latch into the groove provided in the support plate, inserting the scalpel from above between them, and then screwing the countersunk screw from above. The structure is extremely simple, and the installation work is easy. Furthermore, the latch moves and tightens the knife according to the thickness of the knife by screwing in the countersunk bolt, so it can be used with knives of different thicknesses. However, it can be installed.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view of the empty ring holding and cutting device;
The figure is a plan view of essential parts of an overlock sewing machine equipped with an empty ring holding and cutting device. 1... Throat plate, 2... Empty ring holding and cutting device, 4...
Support plate, 5... Holding plate, 5a... Groove into which the female fits, 9... Bolt, 11... Nut, 12... Coil spring, 13... Groove, 14... Tapered surface, 15
...Latch, 16...Countersunk screw, 17...Female, 1
8... Slit groove, 19... Flat surface, 21... Bent part, 22... Engaging part, 25... Empty ring.

Claims (1)

[Claims for Utility Model Registration] (1) A support plate fixed on the bed in front of the throat plate, a presser plate placed on the support plate, and a presser plate that is passed through the support plate and the presser plate to prevent rotation. A bolt that pivotally supports the plate, a nut that is screwed onto the protruding end of the bolt that protrudes from the support plate, a coil spring that is attached to the bolt between the nut and the support plate that presses the presser plate against the support plate, and a support plate. The knife is installed between the plate and the presser plate, and is used to cut the empty ring inserted between the two plates. In the hollow ring holding and cutting device of the overlock sewing machine, the bolt is passed through the hole and cut with a scalpel to hold the cut end of the empty ring connected to the needle between a support plate and a presser plate. One end is bent and passed through the slotted groove, and the end protruding from the slotted groove is releasably locked in the locking grooves provided radially at regular intervals on the contact surface of the nut and in the circumferential direction. An empty ring holding and cutting device for an overlock sewing machine, which is characterized by: (2) The empty ring holding and cutting device for an overlock sewing machine according to claim 1, wherein both ends of the slotted groove are cut off to form a flat surface. (3) A support plate fixed on the bed in front of the throat plate, a presser plate placed on the support plate, and a bolt that is passed through the support plate and the presser plate to prevent rotation and pivotally supports the presser plate; A nut screwed onto the protruding end of a bolt protruding from the support plate, a coil spring attached to the bolt between the nut and the support plate to press the presser plate against the support plate, and a coil spring between the support plate and the presser plate. After the sewing is finished, the hollow ring connected to the sewing machine needle from the sewing end of the fabric is passed between the support plate and the presser plate and cut by the scalpel. In the ring holding and cutting device of an overlock sewing machine, which holds the cut end of the ring connected to the needle with a support plate and a presser plate, a groove for attaching a knife is formed in the support plate, and the inner side of the groove is formed with a tapered surface. Fit the U-shaped latch, place a knife with a blade on the side in the groove to hold the latch, and screw in the countersunk screw with the tapered surface connected to the latch and groove side. An empty ring holding and cutting device for an overlock sewing machine, wherein a knife is fastened, and a retaining plate is provided with a groove on its lower surface into which a knife protruding from a support plate fits. (4) forming a female mounting groove in the support plate and fitting a U-shaped latch with a tapered inner surface into the groove;
A knife with a blade on the side is placed in the groove and held down with a latch, and by screwing in a countersunk screw connected to the tapered surface, the knife is tightened between the latch and the side of the groove. 2. An empty ring holding and cutting device for an overlock sewing machine according to claim 1, wherein the lower surface thereof is provided with a groove into which a knife protruding from the support plate is fitted.