JPS6345256Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] The present invention relates to a stitch presser adjustment device for a sewing machine.

[Application field of this invention]

The seam presser device of the sewing machine described above can also be used in industrial sewing machines and household sewing machines to prevent seam wrinkles.

[Prior art]

Conventionally, as a stitch presser adjustment device for a sewing machine, there is a Japanese Patent Application No. 58-017059 (Japanese Patent Publication No. 61-57037). This item is attached to a presser foot fixed to a presser bar.
A presser foot mount that moves back and forth in an arc as the upper shaft rotates is attached to the shaft, and a seam presser with a presser section is attached to the presser foot mount. This relates to a needle feeding die that moves upward and backward in the reverse feeding direction.

In this conventional sewing machine stitch presser adjustment device, the needle is synchronized with the feed dog and moves in the cloth feeding direction together with the feed dog while remaining stuck in the workpiece, and then the needle comes out of the workpiece and moves in the cloth feed direction. This is a needle feed sewing machine that moves in the opposite direction, and in order to eliminate the influence of thread tightening tension, the stitch presser is equipped with a stitch presser adjustment device that moves up and down in sync with the upper shaft installed behind the needle hole when tightening the thread take-up. When tightening the thread, the stitches are held down, and when the thread is tightened using a thread take-up, the tension does not affect the stitches after sewing.

[Problems with conventional technology and their technical analysis]

In this conventional sewing machine stitch presser adjustment device, the needle is synchronized with the feed dog and moves in the cloth feeding direction together with the feed dog while remaining stuck in the workpiece, and the needle comes out of the workpiece and moves in the cloth feed direction. This is a needle feed sewing machine that moves in the opposite direction, and in order to eliminate the influence of thread tightening tension, a stitch presser is installed behind the needle hole and moves up and down in synchronization with the upper shaft when tightening the thread. The presser foot and thread take-up are also used to tighten the thread so that the tension does not affect the stitches after sewing, thereby preventing wrinkles, but this stitch press is attached to the presser bar of the sewing machine. Even when the stitch length (feed amount) is changed by only moving up and down at a constant position, the position at which the stitch is pressed remains constant. Therefore, when the stitches are made thinner, the stitches that are sewn a few stitches ahead are pressed down, and the completed stitches before the first stitch to be formed are not pressed down, and the force that pulls the thread of the thread take-up is reduced. This affects the seams and can easily cause seam wrinkles. Therefore, each time the stitch length is changed, it is necessary to adjust the position of the stitch presser from the needle.

[Technical issues]

Therefore, the present invention is to adjust and link the operation amount of the stitch presser from the center of the needle to the rear of the stitch by operating the feed adjustment knob.
This is a technical issue.

[Technical means]

The technical means taken to solve the above technical problem is to engage one end of the connecting rod with the adjustment screw,
The other end is swingably attached to the connecting arm, the connecting arm and the adjusting arm are connected by a shaft, the end face of the adjusting arm is engaged with the forked part of the link, and the other end is pivotally supported with a pin. It is made to be able to swing around a shaft that is supported on the body,
The pin and the two prongs provided on the seam presser adjusting piece are fitted together, a long hole is provided in the seam presser adjusting piece, a shaft is fitted into the long hole and fitted to the mounting body, and the seam presser The adjustment piece is made to be able to swing along the elongated hole, the stitch presser adjustment piece is made to be adjustable back and forth in the sewing direction in conjunction with the operation of the feed adjustment knob, and a pin is attached to the stitch presser adjustment piece. A seam presser, which is pivotably supported and fitted in a swingable manner, is moved up and down by a seam presser actuating arm that is interlocked with the actuating arm.

[Effect of technical means]

The said technical means works as follows. That is, as shown in FIG. 2, when the thread take-up pulls up the upper thread, the stitch presser 7 presses the previous stitch at intervals of the maximum stitch length a. However, if the stitches are now made smaller, it is necessary to reduce the distance between the needle and the presser foot to b as shown in FIG. Therefore, in the stitch presser adjustment device of the sewing machine of the present invention, as shown in FIG.
4 is moved and set to control the required stitch length, the connecting rod 15 connected to the feed adjustment screw 14 is moved. Therefore, when the shaft 17 rotates (counterclockwise or clockwise), the actuating arm 18 rotates, and the pin 18a moves to the left or right.Therefore, the link 19 rotates counterclockwise or clockwise about the shaft 20. Then, the pin 19a moves the stitch presser adjustment piece 21 to the right or left. Since the pin 7a of the stitch presser 7, which is pivotally supported by the stitch presser operating arm 5, is fitted into the fan-shaped groove 23 of the stitch presser adjustment piece 21, the stitch presser 7 cannot be moved to the right or left (fabric feed). direction)
Moving. That is, when the feed adjustment knob 13 is used to adjust the feed stitches to the required amount, the stitch presser presses the stitches at a position one stitch apart from the needle position accordingly. Also, the vertical movement of the seam presser 7 is controlled by the pin 7.
a moves up and down in the fan-shaped groove 23, and the stitch presser 7 can move up and down at a fixed position.

[Special effects produced by the present invention]

The present invention produces the following unique effects. In other words, when you move the feed dial that adjusts the stitch length, the stitch presser always presses the immediately previous formed stitch in response to the movement, and the stitch presser is always operated at the optimal position for any length. This structure makes sewing operations easy, and it is possible to sew beautiful seams that do not always produce seams, and is also very effective in preventing stitches and thread breakage.

〔Example〕

An upper shaft 2 provided on the sewing machine arm 1, a presser foot bar 3, a needle bar 4, a stitch presser drive shaft 27 that moves in synchronization with the upper shaft,
In a needle feed sewing machine with a stitch presser device consisting of a mounting body 6 attached to a presser bar, a stitch presser 7, etc., the swing amount of a feed fork 11 driven by a feed cam 10 fixed to an upper shaft 2 is adjusted. feed adjustment cam 24
is swingably attached to the feed fork 11, a feed adjustment knob 13 is rotatably attached to the sewing machine arm 1, and a feed adjustment screw 14 is removably built into the tip of the knob 13; The feed adjustment screw 1
4 is engaged with a connecting rod 15, and the other end of the connecting arm 16 is fitted into a connecting arm 16 with a pin 16a so as to be swingable. The connecting arm 16 is fixed to a shaft 17, which is rotatably inserted into bearings 17a, 17b, and the bearings 17a, 17b are fixed to the sewing machine arm 1. An adjustment arm 18 is swingably fixed to the other end of the shaft 17, and a pin 18a is fixed to the tip thereof, and the pin 18a engages with a fork 25 provided at one end of the link 19. The link 1
A pin 19a is also fixed to the other end of 9.
a and the fork 21a provided on the seam presser adjustment piece 21.
are engaged with each other, and a long hole 26 is provided so that the seam presser adjustment piece 21 can be moved back and forth, and the shaft 2
2 and 22', the seam presser adjustment piece 21 is further provided with a sector-shaped elongated hole 23, which is fitted with a pin 7a provided with a protrusion on the seam presser 7 to adjust the seam. The presser foot 7 can be moved up and down. The stitch presser 7 and the stitch presser operating arm 5 are assembled by a fixed shaft 5a, and are engaged with a contact roller 28 rotatably provided at the tip thereof, the upper end 5b of the arm, and the tip of the operating arm 9. . The operation and structure of the operating arm 9 are the same as those of Japanese Patent Application No. 58-017059, which is the prior art, and will therefore be omitted.

[Brief explanation of the drawing]

FIG. 1 is a side cross-sectional view of a sewing machine equipped with the device of the present invention, FIGS. 2 and 3 are longitudinal cross-sectional views showing the moving state of the stitch presser foot 7, and FIG. 4 is the component parts of the device of the present invention. FIG. 5 is an enlarged longitudinal cross-sectional view showing the related parts of the feed adjustment knob and the connecting arm, FIG. 6 is an enlarged side view of the main parts of the device of the present invention, and FIG. , is an exploded perspective view of the main parts of FIG. 6; 1... Sewing machine arm, 2... Upper shaft, 5... Stitch presser operating arm, 6... Mounting body, 7... Stitch presser, 7
a...pin, 9...operating arm, 10...feeding cam,
11...Feed fork, 13...Feed adjustment knob, 1
4... Adjustment screw, 15... Connecting rod, 16... Connecting arm, 17... Shaft, 18... Adjusting arm, 19... Link, 19a... Pin, 21... Seam presser adjustment piece,
21a...bifurcated, 24...feed adjustment cam, 25...
...forked part of the link, 26...long hole.

Claims (1)

[Scope of utility model registration request] A feed cam is fixed to the upper shaft provided on the sewing machine arm, a feed fork is fitted to the feed cam, a feed adjustment cam is swingably fitted to the feed fork, and the feed is adjusted to the feed adjustment cam. In a sewing machine in which an adjusting screw protruding from a knob is engaged, one end of a connecting rod is engaged with the adjusting screw, the other end is swingably attached to a connecting arm, and the connecting arm and adjusting arm are connected to a shaft. the forked portion of the link is engaged with the end face of the adjustment arm, a pin is pivotally supported on the other end of the link, and the link is made swingable about a shaft that is pivotally supported on the mounting body. , the pin and the two prongs provided on the seam presser adjustment piece are fitted together, a long hole is provided in the seam presser adjustment piece, a shaft is fitted into the long hole and fitted to the mounting body, and the seam The presser foot adjusting piece is made swingable along the elongated hole, the stitch presser adjusting piece is made adjustable in the sewing direction in conjunction with the operation of the feed adjusting knob, and the stitch presser adjusting piece is made adjustable in the sewing direction. This is a seam presser adjustment device for a sewing machine, in which a pin is pivotally supported and a seam presser is fitted in a swingable manner and is moved up and down by a seam presser operating arm that is linked to the operating arm.