JPS6213587Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention has a cutting operation section consisting of a movable blade and a fixed blade, and is removably fixed on the sewing machine bed.
The present invention relates to a fabric edge cutting attachment in which the movable blade is driven by being operatively connected to a movement mechanism of a sewing machine in this fixed state.

BACKGROUND ART Conventionally, this type of cloth edge cutting attachment has been known, for example, as disclosed in Japanese Patent Application Laid-Open No. 163146/1983. The cloth edge cutting attachment shown in this publication has a movable blade and a fixed blade, and immediately after the cutting operation section consisting of the movable blade and the fixed blade, a cloth waste discharge guide plate is installed. The fixed blade was installed on a fixed blade support arm that held the fixed blade. In such a fabric edge cutting attachment, since the fabric waste discharge guide plate is formed separately, it takes time and effort to assemble the device, causing an increase in cost.

Additionally, in order to overcome the drawbacks of such attachments for cutting the edges of fabric, there are some attachments in which a guide plate for discharging fabric waste is integrally installed on the presser foot of the sewing machine. When overstitching is performed using such a presser foot, the feed dog installed inside the bed of the sewing machine rises from the top surface of the bed and pushes the presser foot upwards in accordance with a known feeding motion. After the work cloth is transferred, it sinks below the upper surface of the bed of the sewing machine and is separated from the lower surface of the presser foot. Therefore, during the movement of the feed dog, when the feed dog separates from the lower surface of the presser foot and then pushes the presser foot up again, it picks up the cut fabric waste and transports it to the needle drop position. There was a drawback that fabric scraps were sewn together with the sewing machine.

Purpose of the invention The present invention was made in order to eliminate the above-mentioned drawbacks of the conventional technology.The purpose of the invention is to reliably prevent cloth waste from entering the needle drop position, and to
To provide an attachment case that is inexpensive and easily manufactured.

Solution Therefore, in the present invention, the cover part that covers the cloth edge cutting mechanism of the cloth edge cutting attachment has a
When the attachment is fixed on the sewing machine bed, there is a projecting part that extends apart from the surface of the sewing machine bed, and a projecting part that hangs down from the end of the projecting part and is located immediately after the fabric edge cutting operation part. A guide section for discharging cloth waste, which is brought into pressure contact with elastic force, is integrally formed of a synthetic resin material.

Embodiment The details of an embodiment of this invention will be explained below with reference to the drawings.

In FIGS. 1 and 2, a frame 1 of a fabric edge cutting attachment is located on a throat plate 15 and is removably attached to a sewing machine bed 3 with fixing screws 2. As shown in FIGS. A fixed blade 4 is installed on the lower surface of the frame 1 so as to extend in a direction intersecting the cloth feeding direction. As shown in FIG. 2, this fixed blade 4 connects the frame 1 to the sewing machine bed 3.
When attached to the needle hole 5 on the throat plate 15, it extends to the left beyond the feed dog 6 located to the right of the needle hole 5, and has a notch 4a at its tip that opens rearward.
is formed. Further, a blade portion 4b extending in the cloth feeding direction is provided on the left side edge of the notch portion 4a of the fixed blade 4.
is formed, and the movable blade described later and the end of the right feed dog 6 can enter into this notch 4a. A drive arm 7 is rotatably attached to the frame 1 and extends parallel to and spaced from the fixed blade 4. When the frame 1 is attached to the sewing machine bed 3, the drive arm 7 is connected to a movement mechanism (not shown) disposed inside the sewing machine bed, and is rotatable. A movable blade 9 that cooperates with the fixed blade 4 to cut the end of the work cloth is attached to the tip of the drive arm 7 with a screw 8, and together with the fixed blade 4 constitutes a cutting operation section. are doing.

The frame 1 and the internal mechanism (not shown) of the fabric edge cutting attachment are covered by a cover part 10 that is removably engaged with the frame 1, and a flat plate-like protrusion extends from the side of the cover part 10. A portion 10a protrudes to the vicinity of the cutting operation portion. A guide portion 10b projects downward from the left end of the overhang portion 10a, and the overhang portion 10a and the guide portion 10b are formed integrally with the cover portion 10 from a synthetic resin material. It constitutes the Tuchment case. When the guide portion 10b is attached to the sewing machine bed 3, as shown in FIG. 2, the guide portion 10b extends diagonally rearward to the right from immediately behind the cutting operation portion. A notch 10c is formed at the rear of the lower end of the guide portion 10b so as not to interfere with the right feed dog 6. Further, a portion of the lower end of the guide portion 10b that contacts the sewing machine bed 3 is connected to the cover portion 1.
It is located slightly below the lower end of 0. Further, a hole 10d for the fixing screw 2 is bored in the upper surface of the cover part 10.

By the way, the presser foot 12 is attached to the presser foot holder 1 which is fixed to the presser foot bar 14 of the sewing machine with the presser foot tightening screw 13.
6, and as shown in FIGS. 1 and 2, a cloth cutting notch 12a is formed in accordance with the shape of the fixed blade 4. Further, although the presser foot 12 does not face the right feed dog 6, when a presser foot is attached to perform normal sewing work such as zigzag stitching, the lower surface of the presser foot will face the feed dog 6 on the right side. The feeding operation is performed by

Next, the operation of the attachment case constructed as described above will be explained.

First, when the frame 1 is fixed to the sewing machine bed 3 with the fixing screws 2, the guide part 10b formed integrally with the cover part 10 is pressed against the sewing machine bed 3 by the elastic force of the projecting part 10a. Therefore, this guide portion 10b is always in pressure contact with the sewing machine bed 3 and will not be separated from the sewing machine bed 3 by the movement of the right feed dog 6. In this state, when the rear presser foot 12 with the work cloth set is lowered and the sewing machine is started, the drive arm 7 connected to the movement mechanism of the sewing machine moves the movable blade 9 up and down and cooperates with the fixed blade 4. A known cutting operation is started. The workpiece cloth whose ends have been cut off by the fixed blade 4 and the movable blade 9 is smoothly sent toward the needle drop position and sewn with an overlock stitch, and the separated cloth scraps are sent to the guide section 10.
After contacting the front end of the needle b, the workpiece is guided along the guide portion 10b while being pushed toward the cloth feed side by the work cloth on the cloth feed side, and is pushed in a direction away from the needle drop position. Therefore, during sewing, fabric scraps will not enter the needle drop position and be sewn into the sewing machine.
It is possible to continue sewing smoothly.

Effects of the invention As explained above, in this invention, when the cloth cutting attachment is fixed to the sewing machine bed, the guide part is always pressed against the sewing machine bed due to the elastic action of the overhanging part, so that it is ensured that the cloth scraps enter the needle drop position. This prevents fabric scraps from being sewn in. Furthermore, since the guide part is formed integrally with the cover part together with the projecting part, it can be manufactured easily at low cost, and can be easily installed as an attachment.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the fabric edge cutting attachment equipped with the attachment case of the present invention attached to the sewing machine bed, Fig. 2 is its top view, and Fig. 3 shows only the attachment case. FIG. 3 is the sewing machine bed, 4 is the fixed blade, 9 is the movable blade,
10 is a cover part, 10a is a projecting part, and 10b is a guide part.

Claims (1)

[Claims for Utility Model Registration] The cutting unit has a cutting operation unit consisting of a movable blade 9 and a fixed blade 4, is removably fixed on the sewing machine bed 3, and is operatively connected to the movement mechanism of the sewing machine in the fixed state. The cloth edge cutting attachment in which the movable blade 9 is driven includes a cover portion 10 that covers the cloth edge cutting mechanism of the attachment, and an overhang that extends from the cover portion and is spaced from the upper surface of the sewing machine bed 3 when the attachment is in a fixed state. a portion 10a, which is suspended downward from the end of the overhanging portion 10a and is located immediately after the cutting operation portion;
When the attachment is fixed, the elastic force of the overhanging portion 10a presses against the sewing machine bed 3 and guides the cut fabric scraps so that they are discharged in a direction away from the needle drop position of the sewing machine.
An attachment case formed by integrally forming 0b and 0b from a synthetic resin material.