JPH044706Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention, for example, when hemming pants, folds the edge of the cloth and then folds the folded part again to form a triple hem of the cloth. This item relates to a three-wrap sewing tool for a sewing machine used when folding and sewing.

[Conventional technology]

BACKGROUND ART A sewing process called three-wrap stitching is generally applied to parts of clothing, such as the hem of pants, which must be finished at a relatively long length.
In this three-wrap stitch, as shown in FIG. 5, the edge portion C1 of the cloth C is folded back to form a folded portion C2.
Furthermore, the folded part C2 is folded between the folded part C2 and the cloth edge part C1 to form a folded part C3, and the cloth edge part C1, the folded part C2 and the folded part C
3 is made into three layers and sewn together using lock stitches as shown by the broken line arrows.

As shown in FIG. 6, the tools for performing such three-wrap stitches include a fixing plate 80 fixed to the upper surface of the sewing machine bed, and this fixing plate 80.
There is an adjustable rod 82 having a proximal end pivotally connected to the adjusting rod 82, and a three-wound flap part 84 formed by bending a single thin metal plate fixed to the free end of the adjusting rod 82. . The three-wrap wrapper part 84 has a lower horizontal guide surface 86 that guides the edge C1 of the cloth C in the horizontal direction, and the edge C1 of the cloth C is folded back to form the above-mentioned folded part C2 on the edge C1 of the cloth. folding guide surface 88 for folding, folding part C2 of cloth C
, an upper horizontal guide surface 90 that guides the material in the horizontal direction opposite to the lower horizontal guide surface 86, and a folded portion C2 of the cloth C.
A folding guide surface 92 for further folding inward to form a folded portion C3 in the folded portion C2, and a folding regulating surface 94 for contacting the edge of the cloth C and regulating the folding width of the folded portion C3 are formed as continuous surfaces. Each surface is configured to form a gap with the opposing surface facing each other at a distance that allows the cloth C to easily slide into contact with the cloth C.

The three-wrap sewing tool configured as described above has a fixing plate 80 attached to the upper surface of the sewing machine bed in a direction perpendicular to the cloth feeding direction at a position on the front side in the cloth feeding direction with respect to the needle hole position. After fixing, rotate the adjusting rod 82 in the leg opening direction with respect to the fixing plate 80 to position the three-wrap lapper part 84 at a place where it can be easily operated, and then move the edge part C1 of the cloth C to the lower horizontal guide surface. 86, the cloth C is inserted into the folding guide surface 88 to bend the cloth edge C1, forming a folding portion C2 on the cloth edge C1, and then sliding the cloth C along the upper horizontal guide surface 90. Then, the folded part C2 of the cloth C is inserted into the folding guide surface 92 and the folded part C2 is bent, thereby forming a folded part C3 in the folded part C2. After the cloth is attached to the three-wrap flap part 84 in this manner, the adjustment rod 82 is rotated to abut against the fixing plate 80, thereby completing preparation for sewing work.

By the way, in three-fold stitching, as shown in Fig. 5, the rising width is the distance between the first bending point and the second bending point and is approximately equivalent to the width of the folded part C2 (this is generally called The Hem size (Hem size) is changed as appropriate depending on the sewing area, etc. Generally, the rising width H is 45mm, 50mm.
mm, 64mm, 76mm, 88mm, 100mm, and 127mm, and conventionally, sewing work has been performed using a special three-wrap sewing tool for each rising width H. The three-wrap sewing tool shown in Figure 6 above is a tool dedicated to sewing three-wraps with a maximum size, that is, a rising width of 127 mm. It shows tools specifically for wrapping stitches. In FIG. 7, parts having substantially the same functions as those in FIG. 6 are given the same reference numerals.

[Problem that the invention attempts to solve]

As mentioned above, in the past, it was extremely uneconomical because it was necessary to prepare a plurality of types of three-wrap sewing tools dedicated to various sewing widths. In addition, when the sewing width is changed, it is necessary to remove the previous three-wrap sewing tool from the sewing machine bed, adjust the position of the new tool, and fix it in place each time.This requires a lot of effort and time. However, there were problems with poor work efficiency.

This idea was created in view of these conventional problems, and allows for a variety of climbs to be achieved with a single tool by performing simple adjustment operations corresponding to the width of the rise when the width of the rise changes. A technical problem is to provide a three-wrap sewing tool capable of performing three-wrap stitches of three widths.

[Means for solving problems]

In this invention, as a technical means for achieving the above-mentioned object, a three-wrap sewing tool for a sewing machine is constructed as follows. That is, the three-wrap sewing tool of the sewing machine according to this invention has a lower horizontal guide surface on which the vicinity of the edge of the cloth is placed and guides the cloth in the horizontal direction, and a gap provided above the lower horizontal guide surface. a horizontal plate part disposed parallel to the lower horizontal guide surface; and a horizontal plate part formed in connection with the lower horizontal guide surface, which guides the cloth so as to fold back the edge of the cloth to form a folded part at the edge of the cloth. a folding guide surface, a protrusion formed at the tip of the horizontal plate part so as to face the folding guide surface on the inner side thereof, and a fabric edge portion formed in connection with the folding guide surface; an upper horizontal guide surface that guides the folded portion of the fabric edge in a horizontal direction opposite to the guiding direction by the lower horizontal guide surface; Furthermore, there is a folding guide surface that guides the cloth so that it is folded inward to form a folded part at the folded part, and a folding guide surface is formed in connection with this folding guide surface and comes into contact with the edge of the cloth to regulate the folding width of the folded part. It is attached to the upper surface of the sewing machine bed at a position on the front side in the cloth feeding direction with respect to the needle hole position, so that the edges of the cloth are triple stacked and the cloth is fed to the needle hole position. In the three-fold sewing tool for a sewing machine, the lower horizontal guide surface and the folding guide surface are formed on the fixed part, the folding guide surface and the folding regulating surface are formed on the movable part, and the movable part is horizontally connected. A plate portion is integrally provided, the upper horizontal guide surface is formed on the horizontal connecting plate portion, and the horizontal connecting plate portion of the movable portion is movable with the folded guide surface formed on the fixed portion. A first adjustment locking means is provided to adjustably engage and fix the length of the upper horizontal guide surface that communicates with the folding guide surface formed in the movable part, and the horizontal plate part is characterized by being provided with a second adjusting and locking means that adjustably engages and fixes the distance between the folded guide surface formed on the fixing part and the protrusion at the tip of the horizontal plate part. ing.

[Effect]

In the three-wrap sewing tool having the above configuration, first, the lock between the fixed part and the horizontal connecting plate part of the movable part by the first adjustment locking means is released, and then the movable part is moved relative to the fixed part. The distance between the folding guide surface formed on the fixed part and the folding guide surface formed on the movable part, that is, the length of the upper horizontal guide surface is adjusted. Then, at an appropriate position,
By fixing the horizontal connecting plate portion of the movable portion to the fixed portion by the adjusting and locking means, the width of the folded portion of the cloth, that is, the rising width is determined. Next, after releasing the lock between the movable part and the horizontal plate part by the second adjustment locking means, by moving the horizontal plate part with respect to the movable part, the folding guide surface formed on the fixed part is aligned with the horizontal plate part. The distance between the tip of the plate and the protruding part is adjusted, and the horizontal plate is fixed to the movable part by the second adjustment locking means at an appropriate position, so that the adjustment operation corresponding to the rising width is performed. ends.

The three-wrap sewing tool is attached to the top of the sewing machine bed at a position on the front side of the needle hole in the fabric feeding direction, and has been adjusted according to the rising width by the above-mentioned operation. When performing winding stitching, first insert the fabric edge into the folding guide surface while sliding it into contact with the lower horizontal guide surface.The fabric edge is guided by the folding guide surface and the fabric edge is sewn along the folding guide surface. is bent to form a folded portion at the edge of the cloth. Furthermore, when the folded part is inserted into the folding guide surface while the fabric is in sliding contact with the upper horizontal guide surface, the edge of the fabric is guided by the folding guide surface and the folded part is bent along the folding guide surface. A folded portion is formed in the. Then, when the cloth is fed further, the edge of the cloth comes into contact with the folding regulating surface, and the folding width of the folding portion is regulated. After the cloth is attached to the triple wrapper part in this way, the cloth is sent to the needle hole position and sewn.

〔Example〕

Hereinafter, preferred embodiments of this invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing a three-wrap sewing tool according to an embodiment of the present invention together with a portion of the sewing machine main body. In the figure, a sewing machine needle 6 is hung vertically from a sewing machine arm 4 provided on a sewing machine bed 2.
This three-wrap sewing tool is attached to a position on the front side in the cloth feeding direction with respect to the needle hole position 8 directly below.
To attach this three-wrap sewing tool to the sewing machine bed section 2, place the fixing plate 10 in a direction perpendicular to the cloth feeding direction, and attach it to the top surface of the sewing machine bed section 2 with two fixing screws 12, 12. This is done by fixing. At one end of the fixing plate 10, a contact side 14 for positioning a main body portion, which will be described later, and a cloth feeding guide surface 16 are formed.

A main body is attached to the other end of the fixed plate 10. This main body part includes a rotating plate 18, a base part 2
0, fixed part 22, movable part 24 and horizontal plate part 26
It consists of The movable plate 18 is formed into a dogleg shape, and its base end is connected to the end of the fixed plate 10 by a pivot shaft 28 so as to be rotatable in a horizontal plane. The free end of the rotating plate 18 is inserted into and out of the base 20, and is inserted through the elongated hole 30 of the base 20 to allow the rotating plate 18 to be inserted into the base 20.
The rotating plate 18 and the base portion 20 are fixed by a fixing screw 32 screwed into the rotating plate 18 and the base portion 20. Furthermore, by sliding the base section 20 with respect to the rotating plate 18 with the fixing screw 32 loosened, the position of the main body section in the direction perpendicular to the cloth feeding direction can be adjusted. The rotating plate 18 is provided with a scale 34 for adjustment.

One end of the base portion 20 is plate-shaped, and the fixing portion 22 is integrally fixed to the band-shaped plate 36. A guide portion 38 is formed at a connecting portion between the band-shaped plate 36 of the base portion 20 and the fixing portion 22. The fixing part 22 consists of an arc-shaped curved part and a flat plate part, and a folding guide surface 40 is formed on the curved part to guide the cloth so that the edge of the cloth is folded back to form a folded part at the edge of the cloth. A lower horizontal guide surface 42 is formed in the portion to guide the edge portion of the cloth in the horizontal direction.

The movable part 24 consists of a first horizontal connecting plate part 44, a winding tubular part 46, and a second horizontal connecting plate part 48.
The lower surface of the horizontal connecting plate part 44 becomes an upper horizontal guide surface 50 that guides the folded part of the fabric edge part in the horizontal direction, and the folded part of the fabric edge part is folded inward to the winding tubular part 46 to form a folded part in the folded part. A folding guide surface 52 that guides the cloth to form a fold-in portion, and a folding regulating surface 54 that comes into contact with the edge of the cloth to regulate the folding width of the folded portion are respectively formed. The movable part 24 is fixed to the first horizontal connecting plate 44 by a fixing screw 58 inserted through a long hole 56 formed in the first horizontal connecting plate 44 and screwed into the band plate 36. It's getting old. And the fixing screw 58
With the first horizontal connecting plate part 44 loosened, connect it to the strip plate 3.
6, the movable part 24 is moved horizontally relative to the fixed part 22, and the folding guide surface 40 formed on the fixed part 22 and the folding guide surface 52 formed on the movable part 24 are moved. The distance between the upper horizontal guide surface 50, that is, the length of the upper horizontal guide surface 50 can be adjusted.

Further, the horizontal plate part 26 is attached to the second horizontal connecting plate part 48 of the movable part 24 by inserting the fixing screws 62, 62 into the long holes 60 formed in the second horizontal connecting plate part 48. It is attached by screwing it into the The lower surface of this horizontal plate portion 26 is connected to the fixed portion 22
It faces the lower horizontal guide surface 42 in parallel with a predetermined gap therebetween. Further, the tip of the horizontal plate portion 26 is a protrusion 64 facing the folding guide surface 40 of the fixing portion 22 . And the fixing screw 62,
By sliding the horizontal plate part 26 in the horizontal direction with respect to the second horizontal connecting plate part 48 with the screws 62 loosened, the protruding part 64 at the tip of the horizontal plate part 26 and the fixing part 2
The distance between the folding guide surface 40 and the second folding guide surface 40 can be adjusted.

Next, the procedure for adjusting the three-wrap sewing tool will be explained with reference to FIGS. 2 to 4.

FIG. 2 is a front view of the essential parts of the three-wrap sewing tool, showing a state in which the three-wrap stitch is performed with the maximum rising width. To adjust to the state shown in Figure 2,
First, after loosening the fixing screw 58, the first horizontal connecting plate part 44 of the movable part 24 is guided by the guide part 38 and slid against the strip plate 36 of the base part 20,
By moving the movable part 24 in the horizontal direction relative to the fixed part 22, the folding guide surface 40 of the fixed part 22
and the folding guide surface 52 of the movable part 24,
That is, the length of the upper horizontal guide surface 50 is adjusted.
Then, by tightening the fixing screw 58 at a position where the length of the upper horizontal guide surface 50 corresponds to the width of the folded part to be formed in the cloth, that is, the rising width, the first horizontal connecting plate of the movable part 24 is fixed. Part 44
is fixed to the strip plate 36 of the base portion 20. Next, by loosening the fixing screws 62 and 62 and moving the horizontal plate part 26 with respect to the second horizontal connecting plate part 48 of the movable part 24, the protruding part 6 at the tip of the horizontal plate part 26
4 and the folded guide surface 40 formed on the fixing part 22, and then tighten the fixing screws 62, 62.
By tightening the second horizontal connecting plate part 48
The horizontal plate portion 26 is fixed to.

In order to change and adjust the state shown in Fig. 2 so as to be able to perform three-wrap stitches with the minimum rising width, first loosen the fixing screws 62, 62, and then tighten the fixing screws 62, 62. By pulling it to the left in the figure, the horizontal plate part 26 is moved to the left in the figure, and as shown in FIG. 40
In this state, the fixing screws 62, 62 are tightened to fix the horizontal plate part 26 to the second horizontal connecting plate part 48. Next, loosen the fixing screw 58 and attach the first horizontal connecting plate section 44 of the movable section 24 to the guide section 38.
By sliding the movable part 24 against the strip plate 36 of the base part 20 while being guided by the folding guide surface 40 of the fixed part 22 and the folding guide surface 52 of the movable part 24, the movable part 24 is moved to the right in the figure. approach. Then, at a position where the length of the upper horizontal guide surface 50 corresponds to the minimum rising width to be formed on the cloth, tighten the fixing screw 58 to connect the first horizontal connecting plate 44 to the strip-like shape of the base 20. It is fixed to the plate 36.

Although the three-wrap sewing tool of this invention has the above-described configuration, the scope of this invention is not limited by the contents of the above explanation and drawings, and various modifications may be made without departing from the gist. It may also include variations of the above. For example, the locking mechanism between the fixed part and the movable part and the locking mechanism between the movable part and the horizontal plate part are not limited to the fixed screw type of the above embodiment, but various mechanisms can be used.

[Effect of idea]

Since this invention is constructed and operates as explained above, when using the three-wrap sewing tool of the sewing machine according to this invention, a single tool can be used to process three-wrap stitches with various rising widths. This eliminates the need to prepare a plurality of three-wrap sewing tools dedicated to various stitch widths as in the past, which is extremely economical. Further, there is no need to replace the tools, which is conventionally done every time the rising width changes, and it is possible to cope with changes in the rising width by simply performing a simple adjustment operation, thereby improving work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a three-wrap sewing tool according to an embodiment of the invention together with a part of the sewing machine main body;
Figures 2 to 4 are front views of main parts for explaining the procedure for adjusting the three-fold sewing tool shown in Figure 1, and Figure 5 is a perspective view for explaining the three-fold sewing. 6 and 7 are a perspective view and a perspective view of a main part of a conventional three-wrap sewing tool designed exclusively for the maximum rising width and for the minimum rising width, respectively. 2... Sewing machine bed part, 8... Needle hole position, 20
... base part, 22 ... fixed part, 24 ... movable part,
26...Horizontal plate portion, 36...Strip plate, 38...Guide portion, 40...Folding guide surface, 42...Lower horizontal guide surface, 44...First horizontal connecting plate portion, 48...
Second horizontal connecting plate portion, 50... Upper horizontal guide surface, 5
2...Folding guide surface, 54...Folding regulation surface, 5
6, 60...Elongated hole, 58, 62...Fixing screw, C
... Cloth, C1... Edge portion of cloth, C2... Folded portion, C3... Folded portion.

Claims (1)

[Scope of utility model registration request] A lower horizontal guide surface on which the vicinity of the edge of the cloth is placed and guides the cloth in the horizontal direction, and a horizontal plate section that is arranged parallel to the lower horizontal guide surface with a gap above the lower horizontal guide surface. a folding guide surface that is formed in connection with the lower horizontal guide surface and guides the fabric so as to fold back the edge of the fabric to form a folded part on the edge of the fabric; A protrusion formed at the tip of the horizontal plate part to face the protrusion, and a protrusion formed in connection with the folded guide surface to guide the folded part of the fabric edge in the guiding direction by the lower horizontal guide surface. is formed so as to be connected to the upper horizontal guide surface and to form a folded portion in the folded portion by further folding the folded portion of the fabric edge inward. a folding guide surface that guides the folding section; and a folding regulating surface that is formed in connection with the folding guide surface and contacts the edge of the fabric to regulate the folding width of the folding section; In a three-wrap sewing tool for a sewing machine, which is attached to a position on the front side in the cloth feeding direction with respect to the needle hole position, and feeds the cloth to the needle hole position by overlapping the edges of the cloth three times,
The lower horizontal guide surface and the folding guide surface are formed on the fixed part, the folding guide surface and the folding regulating surface are formed on the movable part, and a horizontal connecting plate part is integrally provided on the movable part, so that the horizontal The upper horizontal guide surface is formed on the connecting plate part, the horizontal connecting plate part of the movable part is formed on the fixed part, and the folding guide surface formed on the fixed part and the folding guide surface formed on the movable part are formed. A first adjustment locking means is provided for adjusting and fixing the length of the upper horizontal guide surface to be connected, and the horizontal plate part is attached to the movable part, and the folded guide formed in the fixed part is provided. A three-wrap sewing tool for a sewing machine, characterized in that a second adjustment locking means is provided for adjusting and fixing the distance between the surface and the protrusion at the tip of the horizontal plate part.