JPH0223986A - Working method and working device for cloth pressing piece of sewing machine - Google Patents

Abstract

PURPOSE:To enable cloth to be smoothly fed between a cloth holding piece and a needle plate by moving the cloth holding piece above the extremely thick cloth to be engaged with a top section, after a sewing mechanism is stopped and a needle is moved upward and engaged with an upper section and an upper louver is engaged with a side section and a lower section from the viewpoint of the upper surface of the cloth holding piece. CONSTITUTION:A motor 26 and a main shaft 24 are continuously rotated in one direction, and the sewing mechanism of a sewing machine is worked, and after the front end 13 of cloth 3 is separated from a cloth pressing piece 2 in the cloth feeding direction 8, a controlling body 27 is worked. By the controlling body 27, the stopping of the main shaft 24 and a rotary position are discriminated, and when an upper louver 7 is set at an upper section on the upper surface of the cloth holding piece 2 and a needle 1 is set under the cloth holding piece 2, then by the main shaft 24 via the motor 26, the upper louver 7 is separated under the side surface of the cloth pressing piece 2, and the needle 1 is positioned above the cloth pressing piece 2, and they stop respectively.

Description

[Detailed Description of the Invention] [Industrial Application Field] The invention according to this application (hereinafter abbreviated as the claimed invention) is
The present invention relates to a presser foot for a sewing machine, and more particularly to a method and apparatus for operating a presser foot for a sewing machine, which is provided with a so-called upper louver for forming an overcut seam.

(4) The operating device for a sewing machine presser foot according to claim 2 or 3, wherein the control body of the control device comprises a microcomputer.

(5) Claim 2.3, wherein the lifting and locking of the presser foot piece of the control device is performed by two actuating bodies and a pressing body.
4. The operating device for the sewing machine presser foot according to 4.

[Conventional technology]

In this type of conventional technology, as shown in Fig. 1.2 AB, a needle 1 moves up and down with needle thread, and a needle 1 that constantly receives a downward elastic force under the total 1 resists the elastic force. a cloth presser foot 2 that can be raised by pressing the cloth presser foot 2; a throat plate 4 fixed horizontally below the cloth presser foot 2 so as to sandwich the cloth 3 in cooperation with the cloth presser foot piece 2;
A ring (131[) stitch is formed in cooperation with the feed dog 6, which moves in a parallelogram shape and protrudes from the groove 5 of the throat plate 4 and moves in a parallelogram so as to feed the cloth 3 intermittently along a straight line, and a total of 1 needle thread. The upper looper 7 moves up and down in a parabolic manner in the cloth feeding direction between the upper part of the presser foot piece 2 and the lower part of the needle Fi4, and
The cloth feed direction is adjusted so as to form an overlock chain seam IO or an empty chain seam 11 of a constant width of 7 on the cloth edge 9 horizontally orthogonal to the cloth feed direction 8 depending on the presence or absence of the cloth 3. A tongue piece 12 protrudes from and fixed to the cloth presser piece 2.

When the sewing mechanism of the sewing machine (total 1. feed @ 6° upper looper 7) is operated to perform sewing work, the vertical movement of the presser foot 7 is operated as follows.

(a) When forming the overlock chain seam 10 on the fabric edge 9 of the fabric 3, press the fabric presser piece 7 and press the first stitch. As shown in Fig. 2A, the fabric 3 is placed at the lowest position 14 by elastic force so as to be pressed against the upper surface of the throat plate 4 (Fig. 1.2A). (b) After sewing the fabric 3, In this method, the empty chain seams 17 are made to protrude from the front end 13 of the cloth in the cloth feeding direction further forward, and then the empty chain seams 11 are automatically cut off at a location close to the front end 13 using a thread cutting blade or the like. As shown, presser foot piece 7
Then, as shown in FIG. 1.2B, raise the cloth 3 slightly from the upper surface and lock it at the middle upper part 15. (Chapter 1.2
Figure B) (Problem to be Solved by the Invention) In the above-mentioned conventional technology, in preparation for sewing, with the presser foot piece 2 locked at the upper intermediate position 15 as shown in Figure 1.2B, When inserting the cloth 3 from right to left between the lower surface of the presser foot piece 2 and the lower surface of the throat plate 4, make sure that the thickness of the cloth 3 is thin like X and is lower than the middle upper part 15 of the presser foot piece 2. For example, there is no problem in inserting the cloth 3.

However, as shown in Fig. 3, one end of the cloth 3 is folded over in an S-shape as shown in Fig. B, and a chain stitch 10 is made, and the stitch is passed along the outside of the edge of the upper side 3a. After penetrating from the upper surface to the lower surface in the middle of the upper edge, and then penetrating from the top to the bottom through the middle of the thickness of the bent part between the inset 3b and the lower side 3C, and continuing to the outside of the edge of the upper side 3a. , As shown in Fig. 3C, unfold the upper side 3a by turning it clockwise around the hem seam 10 of the bent part of the middle and lower sides 3b and 3c, and when viewed from the top surface, hide the seam and use it as the hem of the garment. However, since the fabric 3 is folded in an S-shape, it becomes bulkier than when it is a single piece, and when sewing the ribbed rubber knitted fabric 16 to the fabric 3, such as at the cuffs or hem of sportswear, the fabric 3 The S-shaped folded portion becomes even bulkier and hardens due to the nature of the rubber.

The distance from the top surface of the throat plate 4 to the middle upper part 15 of the presser foot piece 2 in FIG. It is about 5 mm, and is made by folding the cloth 3 into an S shape as shown in Fig.
The thickness of stacked layers can reach 15n+m, and it can also be folded in layers in the circumferential direction to form cylindrical shapes and sew them together to make cuffs and hems of clothing. 2, and is higher than the intermediate upper position 15 of the presser foot piece 2 in the figure.

Therefore, as shown in Fig. 3A and B, the cloth 3 formed to a thickness of Y by 1° is
The lower surface of the presser foot piece 2 at the middle upper part 15 and the needle 1~.

In order to insert it into the space between the upper surface of 4 and the upper surface of cloth 3 or rib rubber 16,
Compressing, rotating, or twisting the cloth with your fingertips against the elastic force of the cloth requires complicated manual operations to force it into the space, which reduces the efficiency of the cloth feeding operation and also The S-shaped folded portion of the cloth 3 collapses, and the relative positions and dimensions of the top, middle, and bottom sides are out of order, resulting in defects such as the inability to perform the desired oversewing (i'+1).

The purpose of the present invention is to solve the above-mentioned defects of the conventional technology, and it is possible to easily and smoothly attach the presser piece 2 even when using an extremely thick cloth, a cloth folded in an S-shape, or a cloth overlaid with ribbed rubber. This paper attempts to propose an operating method and device for a sewing machine presser foot that can be supplied between the sewing machine and the throat plate 4.

[Means to solve the problem]

In order to achieve the above object, the present invention performs the operations shown in FIG. 1.2C after performing the operations shown in FIGS. 152A and 152B.

That is, after cutting the space seam 11, the sewing mechanism of the sewing machine is stopped, the total 1 is raised upward and locked, and the upper looper 7
Lock the presser foot piece 2 sideways and downwards when viewed from the top surface of the presser foot piece 2, then raise the presser foot piece 2 above the thickness Y of the extremely thick cloth 3 and lock it at the top. do.

[For production]

Since the present invention has a groove bottom as described above, even the cloth 3 having an extreme thickness Y can be easily and smoothly inserted into the space between the cloth presser piece 2 and the throat plate 4, and as shown in FIG. When oversewing the fabric 3 as shown in A, move the presser foot 2 to the lowest position 14 using a well-known elastic force such as a spring so as to press the fabric 3 against the upper surface of the throat plate 4! Therefore, the cloth 3 of thickness Y is compressed to a thin thickness of X, and the overlock chain seam 10 is reliably formed, and then, as shown in FIG. 1.2B, the presser foot piece 2 is 15 and is locked, the fabric 3 moves forward in the fabric feeding direction 8 away from the fabric presser piece 2, and an empty ring seam 11 protrudes from the front end 13 of the fabric 3 in the opposite direction to the fabric feeding direction 8. After the cut is also made near the front end 13, the sewing machine mechanism is stopped and the state shown in FIG.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1A, B, and C, the presser foot piece 2 is fixed at the middle of the support rod 18 to a shaft 17 that is rotatably supported on the sewing machine frame, and is rotatably attached to the hanging end of the support rod 18. The cloth presser piece 2 is supported, and an elastic force such as a spring is always applied downward to the cloth presser piece 2 as is well known.

Two cylindrical actuating bodies 19 and 20 operated by fluid such as air or electromagnetic force are fixed to the sewing machine frame above the support rod 18 on the opposite side from the hanging end, and each has a pressing body 2. ], 22 protrude downwardly against the opposite side of the support rod 18 and are supported so as to be movable up and down.

Further, as shown in FIG. 4, the sewing machine 23 is equipped with a main shaft 24 that rotates in order to operate its sewing mechanism, and one end of the main shaft 4 is provided with a detector 25 for detecting the upper and lower positions of the main shaft. Motor 26 that rotates 22 via a heald and a pulley.
and the detection body 26 are connected by a current circuit, and the motor 26
is also connected to a control body 27 such as a microcomputer through a current circuit, and the control body 27 is connected to an actuating body 19 by a current circuit.
20 are connected to form a control device including a detection body 25, a motor 26, and a control body 27.

The correlation between the actions of these control devices F is constructed as follows. In other words, in the state shown in Figure 1.2 A,
The motor 26 and the main shaft 24 continue to rotate in one direction to operate the sewing machine sewing mechanism, and the control body 27 is sent in the cloth feed direction 8 by the operation of the toothed tooth 6, so that the cloth edge 9 is fed with the needle l, The upper looper 7 and the tongue piece 12 cooperate to form an overlock chain seam 10. In the state shown in Figure 1-2B, the motor 26 and main shaft 24 continue to rotate in one direction, the sewing machine mechanism operates, and the front end 13 of the cloth 3 moves from the cloth presser foot 2 to the cloth feeding direction 8. After they are separated, the control body 27 acts, and the actuating body 20 is actuated, causing the pressing body 21 to protrude downward, press the opposite end of the support body 18 downward, and rotate the vertical end upward about the shaft 17. The presser foot piece 2 is raised to the middle upper part 15 slightly below the top dead center of the upper looper 7 and locked, and after the empty chain seam 11 is continuous between the front end 13 of the cloth 3 and the tongue piece 12. Front end 13
After cutting at a location close to , the sweater 26 is stopped and the sewing mechanism is also stopped. In the state shown in Figure 1.2 C,
The detection body 25 detects the rotational position 1 of the main shaft 24 which determines the vertical position of the needle l and the upper looper 7 whose relative position is related to the needle l, and the control body 2
7, the controller 27 determines the stop and rotational position of the main shaft 24, and if the upper looper 7 is above the upper surface of the presser foot piece 2 and the needle 1 is below the presser foot piece 2, the motor 26
After the upper looper 7 is rotated and stopped so that the upper looper 7 moves away from the side surface of the presser foot piece 2 and the needle 1 is positioned above the presser foot piece 2 and stops, , with the actuating body 20 inactive, the pressing body 21 is moved upward from the support 18 and retracted, and at the same time, the actuating body 19 is activated to project the pressing body 22 downward, pressing the support rod 18 downward, and pivoting the vertical end. 17, the presser foot piece 2 is raised to the uppermost position 2 above the intermediate upper position 15 and is locked therein.

[Other Examples]

The actuating bodies 19 and 20 may be combined into one piece, and the pressing bodies 21 and 22 may also be made into one piece, and the downward protruding distance thereof may be set in two stages.

〔effect〕

The present invention has the above-mentioned configuration and functions, and therefore has the following effects.

l) When the sewing mechanism of the sewing machine is stopped and ready to feed the cloth 3, as shown in FIG. 1.2C, the cloth presser foot 2
Since the cloth 3 is raised and locked higher than the thickness Y of the extremely thick cloth 3, the conventional technique shown in FIG. Without making it difficult to insert the cloth 3 between the presser piece 2 and the throat plate 4, compress the cloth 3 twice with your fingertips or palm against the elastic force of the cloth 3 and the rubber ribs 16.
The cloth can be easily and smoothly inserted and fed without requiring complicated manual operations such as twisting or other forced pushing, which improves the efficiency of cloth feeding work.

2) In addition to the above-mentioned effects, as shown in FIGS. 1.2A and 2B, the cloth 3 is compressed by the downward elastic force of the presser foot piece 2 during sewing work, and the overedge seam 10 is reliably formed. The empty chain seam 11 is also cut after being reliably formed, and automation of sewing thread cutting can also be achieved.

[Brief explanation of the drawing]

Figures 1A, B, and C are side views of the main parts, and Figure 2A. B and C are partial plan views corresponding to each of FIG. 1, and FIG. 3 A B. C is a cross-sectional view of the cloth, and FIG. 4 is a route diagram including the current circuit of the control device.

Claims (6)

[Claims] (1) Use a fabric presser foot that cooperates with the needle and upper looper to form an overseam, and (b) When oversewing fabric, use an elastic piece to press the fabric onto the throat plate. (b) After sewing the cloth, raise it slightly from the cloth and lock it at the upper middle so that the empty chain seam continuously protrudes from the front edge of the cloth and then cuts it. (c) After cutting the empty chain stitch, stop the sewing mechanism, stop the needle upwards, release the upper looper to the side of the presser foot piece, stop it, and then raise it above the middle upper part to the final position. A method of operating a sewing machine presser foot that locks and locks upward. (2) A needle that moves up and down with needle thread, a presser foot that constantly receives downward elastic force below the needle and can rise against the elastic force, and a presser foot that works together with the presser foot to hold the fabric. A throat plate is fixed horizontally below the presser foot so as to sandwich the cloth, a feed dog that protrudes and retracts from the throat plate to feed the cloth intermittently along a straight line, and a ring that works together with the needle thread. The upper looper operates between the upper part of the presser foot and the lower part of the throat plate to form a seam, and the needle thread and the upper looper work together to form stitches horizontally and orthogonally to the cloth feeding direction, depending on the presence or absence of cloth. (a) Sewing the fabric by using a tongue piece that protrudes in the cloth feeding direction and is fixed to the presser foot piece and the presser foot piece so as to form an overlock chain stitch or an empty chain stitch of a constant width. When sewing, use the elastic force to position the fabric at the lowest position so as to pinch it onto the throat plate, and (b) after sewing the fabric, make sure that the empty chain stitch continuously protrudes from the front edge of the fabric before cutting. (c) After cutting the empty chain stitch, stop the sewing mechanism, stop the needle upward, and release the upper looper to the side of the presser foot. An actuating device for a sewing machine presser foot, comprising: a control device that raises the presser foot above the middle and locks it at the uppermost position after stopping. (3) Claim 2, wherein the control device comprises a detection body that detects the rotational position of the sewing machine main shaft, a motor that rotates the sewing machine main shaft, a control body that controls the rotation of the motor, and a current circuit that connects them. Actuating device for the sewing machine presser foot described. (4) The operating device for a sewing machine presser foot according to claim 2 or 3, wherein the control body of the control device comprises a microcomputer. (5) An operating device for a sewing machine presser foot according to any one of claims 2, 3, and 4, wherein the lifting of the presser foot of the control device is performed by two operating bodies and a pressing body. (6) The actuating device for the presser foot of a sewing machine according to any one of claims 2, 3, and 4, wherein the lifting of the presser foot of the control device is performed by one operating body and one pressing body.