JPS6329512Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention has an auxiliary presser foot for body fabrics pivoted on the body of the presser foot for tape presser, which is pivotably attached to the presser bar, and a differential feed dog is provided under the auxiliary presser foot. The present invention also relates to a flat type sewing machine for removing unevenness, which is provided with a binder for supplying tape in front of the presser foot body in the feeding direction.

Sewing machines that sew stockinette fabrics are usually equipped with a differential feed dog in front of the main feed dog in the feed direction.
For sewing in the horizontal (course) direction where there is a large degree of expansion and contraction, the feed amount of the differential feed dog is set larger than the feed amount of the main feed dog, and for sewing in the vertical (wale) direction, the feed amount of the differential feed dog is set larger than that of the main feed dog. The amount is smaller than that of the main feed dog to prevent the fabric from being sewn in a stretch stitch state, but conventionally, flat sewing machines for removing unevenness have a difference in the tape insertion part from the binder. Since no moving feed teeth were provided, the tape was sewn onto the body fabric in a stretched state, and wrinkles tended to occur after sewing. Until now, these problems have been compensated for by corrections made by skilled workers during sewing, but this requires a high degree of skill and also reduces work efficiency.

The purpose of the present invention is to make the above conventional sewing work, which is inefficient and requires a high level of skill, efficient and easy to perform, and for this purpose, a belt feeding device is provided to move the belt. The tape is brought into contact with the tape in the tape insertion section from the binder to the presser foot body, and the tape is made to perform differential cloth feeding movement in the same way as the body fabric.

That is, the present invention includes a tape presser foot main body 3 in which the presser foot 1 is rotatably pivoted to the presser bar 2;
It consists of an auxiliary presser foot 4 for body fabric that is pivotally attached to the main body 3, and a main feed dog under the auxiliary presser foot that also acts under the presser foot body, and a differential gear located only under the auxiliary presser foot. A binder 5 is used in a flat type sewing machine for removing unevenness, which is provided with a feed dog and is further provided with a binder 5 for supplying tape in front of the presser foot body in the feed direction.
This device is equipped with a belt feeding device A that acts on the tape from the presser foot to the bottom of the presser foot body 3 and feeds the tape, and the belt feeding device A is attached to the arm head 6 of the sewing machine so that its mounting position can be adjusted. A belt feed shaft 9 is rotatably supported on the bracket 7 and a bearing (not shown) provided on the bracket 7 and the stand 8, and a belt feed shaft 9 is located above the tape insertion portion of the presser foot body 3 and is attached to the feed shaft 9. A gear 10 to be fixed, a pair of pulleys 11 located diagonally above the gear 10 on both sides of the gear and rotatably supported on the bracket 7 in parallel with the gear, and a pair of pulleys 11 fixed to the presser foot body 3. A guide pin 13 whose mounting position can be adjusted with a screw 12 is hung between the guide pin and both pulleys 11 so that the tooth profile formed on one side faces outward, and the upper part is turned downward. An endless belt 14 that is recessed and hooked around the gear 10 so that its tooth profile meshes with the gear 10.
and a one-way clutch 15 attached to the end of the feed shaft 9 on the stand side.The one-way clutch 15 connects a crank 16 to an eccentric wheel (not shown) fixed to the main shaft with a rod 17, and the crank 16 interlocks with the main shaft. The feed shaft 9 is intermittently rotated by the swinging motion of the tape, thereby intermittently feeding the endless belt 14 so that the tape is fed on the outer side of the endless belt below the guide pin 13. The working surface of the tooth profile on the outside of the endless belt that acts on the upper surface of the tape is adjusted by adjusting the vertical position of the guide pin 13, and is preferably aligned with the bottom surface of the presser foot body 3 to the extent that it lightly presses the tape. . The amount of feed by the endless belt 14 can be adjusted to an appropriate amount by changing the connection position of the rod 17 to the crank 16.

In the above embodiment, the feed shaft 9 is driven by the main shaft via a link mechanism, but the feed shaft may be driven by a step motor that synchronizes with the main shaft, or by connecting a simple motor.
Alternatively, the endless belt may be formed on a surface with a large coefficient of friction without forming tooth profiles on one side. In this case, the gear 10 is replaced by a pulley.

As described above, the flat-type sewing machine for removing rattles of the present invention is equipped with a belt feeding device that feeds the cloth by contacting the tape at the tape insertion part from the binder to the presser foot body, and this allows the tape to be moved in the same manner as the body fabric. The tape can be sewn with a differential cloth feed motion, so the tape can be sewn without being stretched like the body fabric, and there is no need to make corrections when sewing as with conventional methods, making it easy to sew. Removal is done easily and efficiently.

[Brief explanation of the drawing]

The figures show a flat type sewing machine for removing rough patches according to the present invention, and FIG. 1 is a perspective view thereof, and FIG. 2 is an enlarged perspective view of the main parts. 3...Presser foot body, 4...Auxiliary presser foot, 5...
Binder, 7... Bracket, 9... Belt feed shaft, 10... Gear, 11... Pulley, 13...
Guide pin, 14...Endless belt, 15...One-way clutch.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) The presser foot is composed of a presser foot main body for a tape presser that is pivotally attached to a presser bar in a tiltable manner, and an auxiliary presser foot for body fabric that is pivotably attached to the main body, Under the auxiliary presser foot there is a differential feed dog and a main feed dog that also acts under the presser foot body, and on the front side of the presser foot body in the feed direction there is a flat plate for removing tape with a binder for supplying tape. A type sewing machine, which has an endless belt 14 that is rotationally driven, and a part of the belt 14 acts on the tape in the tape insertion part extending from the binder 5 to the presser foot body 3 to perform cloth feeding movement. A flat type sewing machine for removing unevenness, equipped with a feed device A. (2) The flat type sewing machine for removing roughness according to claim 1, wherein the endless belt has a tooth profile formed on one side of the endless belt that acts on the tape. (3) The flat type sewing machine for removing roughness according to claim 1, wherein the endless belt has one surface that acts on the tape and is formed of a surface having a large coefficient of friction.