JPS6329513Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a flat type sewing machine for removing stretch marks, which sews a highly elastic tape supplied from a tape attaching binder onto body fabric having less elasticity.

Conventional technology When removing roughness from knitted fabric using a knitted tape, the body fabric is generally set with the longitudinal (wale) direction in the feeding direction, and the tape fabric is set in the horizontal (course) direction with the feeding direction. Frictional resistance increases on the tape at the exit of the tape, causing the tape fabric to be sewn in a stretched state compared to the body fabric, which causes the tape fabric to shrink and wrinkle the body fabric after stitching, an undesirable phenomenon. occurs. Therefore, in conventional flat-type sewing machines for removing rough patches, a differential feed dog and a main feed dog act on the body material side, and the feed amount of the differential feed dog is smaller than the feed amount of the main feed dog to tape the body material. The fabric was stretched to match the stretch of the ground and then sutured.

Problems with the Prior Art Merely applying differential feed in the manner described above is insufficient to give the body fabric enough stretch to prevent wrinkles when it contracts, and in many cases it is difficult for skilled workers to do so by hand. The reality was that they were adding extra care to make the body dough stretch accordingly.

Means for solving the above-mentioned problems according to the present invention This invention consists of a main feed dog 6 for feeding the body material whose feed dogs act on the body material G, a main feed dog 2 and a differential feed dog 5 for feeding the tape that act on the tape T. The presser foot 7 is rotatably supported on the presser bar 10, and includes a presser foot main body 8 located on the main feed dog 2 for tape feeding, and a differential feed dog 5 for tape feeding that protrudes from the main body. A cloth presser foot 12 located above, a rear auxiliary presser foot 13 which is pivoted to the main body 8 and located above the rear part of the main feed dog 6 for feeding the body fabric, and a lever whose one end is pivoted to the main body 8. A front auxiliary presser foot 14 is pivoted on the other end of the main feed dog 20 and located on the main feed dog 6 on the front side of the needle drop, and a front auxiliary presser foot 14 is also pivoted on the main body 8 and its working end is connected to the lever 20 and the front auxiliary presser foot 14. It has a spring 22 that engages with the upper part of the pivoting point of the tape to apply downward pressure, and the tape is moved differentially while the cloth is securely gripped by the front auxiliary presser foot 14 and the front part of the main feed dog 6. It is characterized in that the feed dog 5 feeds at a feed amount different from that of the body fabric, and the differential feed dog does not act on the body fabric side part, but is newly provided at the tape fabric insertion part, and moreover, the tape An auxiliary presser foot located on the main feed dog on the fabric side is pivoted to the presser foot body provided on the main feed dog on the side, and a presser foot part extending above the differential feed dog is newly formed to form a presser foot part extending above the differential feed dog. The feed amount of the moving feed dog is larger than the feed amount of the main feed dog to reduce the elongation of the tape at the seam part, while the body fabric is kept stretched by feeding only by the main feed dog, so that the body fabric and the tape fabric are Make sure that there is a similar amount of elongation at the suture.

Embodiment Figure 1 shows the main parts of a flat type sewing machine for removing rough patches.On the side where the tape T is inserted from the binder 1, as shown in Figure 2, there is a main feed dog 2 and a needle drop 3 on the front side to feed the fabric. A differential feed dog 5 that performs movement is provided on the body fabric G side, and extends over both the conventional main feed dog action area and the differential feed dog action area, and feeds the cloth at the same feed amount as the main feed dog. A main feed dog 6 is provided for carrying out the feed movement.

The presser foot 7 consists of a presser foot main body 8 for holding the tape disposed on the main feed dog 2, and an auxiliary presser foot for pressing the body fabric attached to the main body and disposed on the main feed dog 6, The presser foot 7 is rotatably supported by a presser bar 10, and when inserting the tape, the tape insertion side is inclined upward to facilitate tape insertion, and the amount of inclination can be adjusted with a screw 11. It's like this. The presser foot main body 8 is formed with a presser foot portion 12 extending from above the main feed dog 2 to above the differential feed dog 5 toward the binder 1. This allows the tape T inserted under the presser foot to be This ensures that the dynamic feed is effectively utilized.

On the other hand, the auxiliary presser foot is the same as that used in the conventional flat-type sewing machine for removing roughness, and the rear auxiliary presser foot 13
and a front auxiliary presser foot 14, and the rear auxiliary presser foot 13 is fitted into the presser foot main body 8 from below, and has a flange-shaped head that is pivotally supported to be slidable in the vertical direction on the main body. The pin 15 is pivotally connected to the lower end of the pin 15 so that it can pivot up and down.
The pin 15 is pressed down by acting on the head of the pin 15, thereby pressing the rear auxiliary presser foot 13 onto the body material G or onto the throat plate 17. The front auxiliary presser foot 14 is pivotally attached to the free end of a lever 20 which is rotatably attached to the presser foot body 8 by a shoulder screw 19, and is wound around the shoulder screw 19 to rotate the lever 20. Similarly, it is pressed onto the body material G on the main feed dog 6 or onto the throat plate 17 by the coiled spring 22 which urges it clockwise. Although not shown, the lever 20 is provided with a stopper to prevent the lever 20 from rotating downward more than necessary due to the action of the coiled spring 22 when the presser foot body 8 is raised.

When removing roughness, adjust the feed amount of the differential feed dog, which is larger than the feed amount of the main feed dog.

Effects According to the present invention, the body fabric part has an auxiliary presser foot 13,
14 and the main feed dog 6 and are fed, the tape material is slightly stretched due to the pressing force of the auxiliary presser feet 13 and 14, and the feed amount of the differential feed dog 5 is less than the main feed. Since the tape is fed at a rate larger than that of tooth 2, the tension of the tape near the needle drop,
In other words, the stretching is reduced, and in the end, the body fabric and the tape fabric can be sewn together with the same amount of stretch, which eliminates the phenomenon of wrinkles in the body fabric after stitching, making it possible to work even if you are not an experienced seamstress. This greatly improves work efficiency.

In addition, since the active end of the spring 22 is engaged and pressurized at the upper part of the pivot point between the lever 20 and the front auxiliary presser foot 14, the body material G is reliably gripped and a large amount is fed along with the tape T. can be prevented. Furthermore, since the presser foot 7 is rotatably supported by the presser bar 10, it is possible to efficiently insert the tape and attach tape to cloth with stepped sections. Capable of attaching tape to fabrics of different thicknesses.

In the present invention, the term "differential feed dog" described above refers to a feed dog located on the front side of the main feed dog in the feed direction.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the main parts of a flat type sewing machine for removing lapels. FIG. 2 is a perspective view of the main parts of the sewing machine shown in FIG. 1 with the cover, presser foot and binder removed. 1...Binder, 2...Main feed dog, 3...Needle entry, 5...Differential feed dog, 6...Main feed dog, 7...
...Presser foot, 8...Presser foot body, 10...Presser bar,
12...Fabric presser foot, 13...Rear auxiliary presser foot, 14
...Front auxiliary presser foot.

Claims (1)

[Scope of utility model registration request] The feed dog consists of a main feed dog 6 for feeding the body fabric that acts on the body material G, a main feed dog 2 and a differential feed dog 5 for feeding the tape that acts on the tape T, and a presser foot 7.
a presser foot main body 8 which is rotatably supported on a presser foot bar 10 and located on the main feed dog 2 for feeding the tape, and a cloth presser foot that protrudes from the main body and is located on the differential feed dog 5 for feeding the tape. 12, a rear auxiliary presser foot 13 which is pivotally attached to the main body 8 and located on the rear part of the main feed dog 6 for feeding the cloth; a front auxiliary presser foot 14 which is placed on the main feed dog 6 on the side near the needle drop;
Similarly, it is pivoted to the main body 8, and its working end is connected to the lever 2.
It has a spring 22 that engages with the upper part of the pivot point between the front auxiliary presser foot 14 and the front auxiliary presser foot 14 to apply downward pressure, and the body fabric is secured between the front auxiliary presser foot 14 and the front part of the main feed dog 6. This flat type sewing machine is designed to feed the tape at a feed rate different from that of the body fabric using differential feed dogs 5 while gripping the tape.