JPS625379A - Cloth cutter of sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cloth cutting device for a sewing machine that is installed in a sewing machine body and cuts a predetermined portion of cloth.

Conventional i-method Conventionally, this type of cloth cutting device has been used to cut slacks, jeans, etc.
Skirts, coats, and shoulder bags are equipped with belt loop sewing machines that produce belt loops for use, or overlock sewing machines that cut the edges of cloth and sew the cut edges. Various types of cloth cutting devices are known. As an example of this cloth cutting device, as shown in FIG. A movable knife 32 is fixed to one end of the movable knife mounting base 30 and a knife drive shaft 33 is connected to the other end, while a fixed knife 34 is mounted opposite the movable knife 32.
is fixed to a fixed knife mounting base 36 near the knife drive shaft below the cloth guide stand 35, and the movable knife mounting base 30 is swung around the mounting axis by the swinging of the knife drive shaft 33. By moving the movable knife 32 with respect to the fixed knife 34, the cloth sandwiched between the movable knife 32 and the fixed knife 34 is cut.

Problems to be Solved by the Invention However, with the structure described above, the movable knife and the fixed knife are separately attached to the sewing machine body, so when the fixed knife is replaced, the gap between the fixed knife and the movable knife is There was a problem in that fabric scraps remaining in the sewing machine body entered the sewing machine, creating a gap between the fixed knife and the movable knife, making it impossible to cut the fabric. Also, when assembling this cutting device to the sewing machine, the movable knife and fixed knife must be positioned and completely assembled to the sewing machine body.
Since the fixed cutter of the fixed knife and the movable cutter of the movable knife cannot work together to cut the fabric, the sharpness of the movable cutter relative to the fixed cutter can be adjusted by positioning the fixed knife and the movable knife at predetermined positions on the sewing machine body, respectively. There was a problem in that it could only be done after the blade was sharpened, making it very complicated to adjust the sharpness of the double-sided blade.

Therefore, an object of the present invention is to solve the above-mentioned problems, and to reduce the possibility of cloth scraps getting between the movable knife and the fixed knife when replacing the fixed knife, and to
To provide a cloth cutting device for a sewing machine which can easily adjust the sharpness of a double-handed zigzag.

Means for Solving the Problems In order to achieve the above object, the present invention is configured such that a fixed knife and a movable knife are housed in one housing, and the housing is detachably attached to the sewing machine body. .

That is, a housing that is removably attached to the sewing machine body, a fixed knife that is housed and fixed in the housing and has a fixed cutter, and a fixed knife that is housed in the housing so as to be slidable relative to the fixed knife and that is fixed. a movable knife having a movable cutter that cuts the cloth in cooperation with a fixed cutter; and a spring means housed in the housing and urging the movable cutter of the movable knife to come into sliding contact with the fixed cutter of the fixed knife. and a movable knife driving means that is provided on the sewing machine body and that slides the movable knife relative to the fixed knife and causes the fixed cutter and the movable cutter to work together to cut the cloth. It was configured as follows.

Effect of the Invention In the above structure, a fixed knife having a fixed cutter and a movable knife having a movable cutter that is biased toward the fixed knife by a spring means and cooperates with the fixed cutter are housed in the housing, After adjusting the movable cutter and the fixed cutter so that they can cut the cloth, the housing is removably attached to the sewing machine body, and the movable knife driving means slides the movable knife against the fixed knife, thereby cutting the fixed cutter. and a movable cutter work together to cut the cloth between the two vines.

Embodiments Below, embodiments of the present invention will be described in detail based on the drawings.

The cloth cutting device according to this embodiment is installed in a belt loop sewing machine, as shown in FIG. 1.2. This belt loop sewing machine includes a front feed dog 2 and a feed dog 3 in the center of a cloth guide table 1, and a pair of cloth cutting devices 4 in the sewing machine main body 20 on both sides of both the feed dogs 2.3. The cloth 5 fed by both feed dogs 2.3 in preparation for detachment.
Each cloth cutting device 4 cuts a predetermined portion of the band cloth 6 having a predetermined width dimension, and both side ends 6a of the band cloth 6.

After bending 6a, these bent parts 6a, 6
The belt loops 7 are manufactured by sewing the parts a to each other.

As shown in FIG. 3.4, each cloth cutting device 4 is housed in a roughly rectangular housing 8 in which a movable knife 10 is slidably housed with respect to a fixed knife 9 by a leaf spring II serving as a spring means. and roughly configure it.

The housing 8 has a U-shaped main body 8b having a female storage space 8a and a cover plate 8c attached with four screws 12. ....

12 and is removably fixed. The − side wall of the main body 8b extends from the opposing side wall to form a fixing portion 8d, and the fixing portion 8d is connected to the knife mounting base 1 in the sewing machine main body 20 below the guide table.
3 with screws 14 and 14 and nuts 15 and 15 in a removable and position-adjustable manner.

The fixed knife 9 is located in the space 8a of the main body 8b of the housing 8.
It is made of a plate having a width dimension that can be stored in the interior, and has a fixed cutter 9a at its upper end and a curved notch 9b at its lower part, and has a connecting shaft of a movable knife drive link 16 (described later) to the movable knife 10. Avoid interfering with the connection of 16a.

The movable scalpel 10 is made of a plate having a width that can be accommodated within the space 8a of the main body 8b of the housing 8 and outside the fixed cutter 9, and has a notch 10a at its upper end. The lower edge has a downwardly inclined chip discharge slope 10c, while the notch 1
At the upper edge of 0a, there is a movable cutter 10b that cooperates with the fixed cutter to cut the cloth. The movable scalpel 10 slides against the fixed knife 9 to cut the cloth 5 sandwiched between the fixed cutter 9a and the movable knife 10b.

Furthermore, the movable scalpel 10 has an elongated hole 10d extending in the longitudinal direction at the center thereof. A fixing screw I7 passing through the center of the cover plate 8C and the spring 11 is passed through the elongated hole 10d, and the fixing knife 9 is inserted into the elongated hole 10d without interfering with the movement of the movable knife 10. It is fixed to the housing 8.

Note that by using the fixing screw 17, only the fixing knife 9 can be easily removed from inside the housing 8. In addition, a knife drive link connection hole 10 is provided at the bottom of the movable knife 10.
It has e. A lower connecting shaft 16a of a movable knife drive link 16 serving as a movable knife drive means is pivotally connected to this knife drive link connection hole 10e.

The upper part of the movable knife drive link 16 is pivotally connected to the front feed tooth 3, and when the front feed tooth 3 makes a substantially elliptical motion and feeds the cloth 5, the movable knife drive link 16 connected to the front feed tooth 3
swings, so that the movable scalpel 10 moves up and down with respect to the housing 8.

The leaf spring 11 has a central portion curved outward with respect to the inside of the housing main body 8b, and is placed between the movable cutter 10 inside the main body 8b of the housing 8 and the cover plate 8C. The movable knife 10 is brought into pressure contact with the fixed knife 9 by bringing the end portion into contact with the movable cutter 9a and bringing the center portion into contact with the cover plate 8c.

Note that the cover plate 8C has a biasing force adjusting screw 18 that comes into contact with the center of the leaf spring 11, and the screw 18 is inserted into the housing 8.
By feeding the screw back and forth against the plate spring 11, the upper central part of the leaf spring 11 can be pressed or released from the pressure to adjust the biasing force of the leaf spring 11, and the contact pressure of the movable knife against the fixed knife 9 can be adjusted. Make it.

In addition, a second adjustment screw 19 is provided on the main body 8b of the housing 8.
The screw 19 presses the upper center of the fixed knife 9 to tilt the fixed knife 9 toward the movable knife, thereby performing a so-called second adjustment between the fixed cutter 9a and the movable cutter 10b. That is, for example, if the fixed cutter 9 is warped in the opposite direction to the movable cutter IO due to manufacturing errors, screw the second adjustment screw into the housing S to press the fixed cutter 9a toward the movable cutter. Adjustments are made so that the cloth 5 can be cut well with the two-sided blades 9a and IOb.

According to the above configuration, the space 8a of the main body 8b of the housing 8
Fit the fixed knife 9, movable knife 10, and leaf spring 11 inside, and attach the cover plate 8C with the screws 12. ..., the above main body 8b at 12
At the same time, the fixing screw 17 is screwed into the cover plate 8C, and its tip is inserted into the elongated hole 10 of the leaf spring 11 and the movable knife 10.
d, and press the fixed knife 9 against the inner wall of the housing to fix it. On the other hand, the connecting shaft 16a of the movable knife drive link 16 is pivotally attached to the coupling hole 10e of the movable knife 10, and the housing 8 is fixed to the knife mounting base 13.

In this way, the cloth cutting device 4 is assembled to the sewing machine main body 20. Then, when the movable knife drive link 16 swings,
As shown in FIG. 5, the movable knife 10 is
is lowered, the movable cutter IOb comes into contact with the cloth 5 on the fixed cutter 10b, and cuts the cloth 5 by the cooperation of the dual force cutters 10b and 9a.

According to the above embodiment, the housing 8 including the fixed knife 9 and the movable knife 10 is connected to the sewing machine body 20 by screws 12.・
Since the fixed knife 9 and the movable knife 10 can be integrally attached to or detached from the sewing machine body 20 by detachably attaching them at 12, the housing 8 can be removed from the sewing machine body 20. If the fixed knife 9 is removed from the housing 8 and the fixed knife 9 is inserted into the housing 8 in a place where there are few scraps of cloth, the scraps of the cloth 5 will be removed between the fixed knife 9 and the movable knife 10. Less chance of getting in between. Therefore, it is possible to effectively prevent a situation in which a gap is created between the stationary knife 9 and the movable knife 10 due to the scraps of the cloth 5, making it impossible to cut the cloth 5.

Also, both females 9. The sharpness of the IO can be adjusted within the housing 8 before being assembled to the sewing machine main body 20, and the above adjustment work can be performed more easily.

Furthermore, when resharpening the fixed cutter 9a or replacing the fixed knife 9, by loosening the fixing screw 17, only the fixed knife 9 can be removed from the housing 8 without removing the movable knife IO or leaf spring 11 from the housing 8. The fixed scalpel 9 can be removed very easily.

Further, after storing the fixed knife 9 and the movable knife 10 in the housing 8 and positioning the movable knife 10 with respect to the fixed knife 9, only the sharpness adjustment of the double force knife 9a and the job can be performed by adjusting the biasing force of the leaf spring 11. Since this can be done by adjusting the second adjustment screw 19, the two-handed forceps 9a, 10b can be easily positioned with respect to the fixed knife 9.
It becomes easy to adjust the sharpness.

Note that the present invention is not limited to the above embodiments,
It can be implemented in various other ways. For example, for the second adjustment of the fixed cutter 9a and the movable cutter 10b, a raised portion may be provided on the inner wall of the housing to perform the same function as the second adjustment screw 19 described above. Moreover, the movable cutter 10 may be connected to a drive member other than the forward feed tooth 3 to move up and down.

Effects of the Invention According to the above configuration, the fixed knife and the movable knife are housed in the housing, and the housing is detachably attached to the sewing machine body, so that the fixed knife and the movable knife can be integrally attached to the sewing machine body. Now that it can be attached or removed, after removing the housing from the sewing machine body, you can remove the fixed knife from inside the housing in a place where there are few fabric scraps, and then reinsert the fixed knife into the housing. When this happens, it becomes less likely that fabric scraps will get between the fixed knife and the movable knife, and the fabric scraps will create a gap between the fixed knife and the movable knife, making it impossible to cut the fabric. situations can be effectively prevented.

In addition, since the movable knife and fixed knife are stored in the housing in a state where they can be used to cut cloth, the sharpness of both knives can be adjusted within the housing before being assembled to the sewing machine body, making the sharpness adjustment work described above easier. I can do it.

Also, when re-sharpening the fixed cutter or replacing the fixed knife, if you remove the housing from the sewing machine body and then remove the fixed knife from inside the housing, the removal process will be easier than when removing the fixed knife from the sewing machine body. can be done easily.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing a fabric cutting device of a sewing machine according to an embodiment of the present invention, Fig. 2 is an explanatory diagram of the belt loose manufacturing process, and Figs. 3 and 4 are longitudinal sectional views of the fabric cutting device, respectively. and a cross-sectional view, FIG. 5 is an explanatory diagram showing the operating state of the cloth cutting device,
FIG. 6 is an exploded perspective view of a conventional sewing machine. ■...Guide table, 2...Front feed dog, 3...Feed dog,
4... Cloth cutting device, 5... Cloth, 6... Band cloth, 7.
...Belt loop, 8...Housing, 8a...Space, 8b...Main body, 8c...Lid plate, 8d...Fixed part, 9...Fixed knife, 9a...Fixed cutter, 9b・・・
・Notch, 10...Movable knife, loa...Notch, 1
0b...Movable cutter, 10c...Slope, 10d
...Elongated hole, 10e...Connection hole, 11...Temporary spring, 12...Screw, 13...Female mounting base, 14...
Screw, 15... Nut, 16... Movable female drive link, 16a... Connection shaft, I7... Fixed screw, 18...
...Biasing force adjustment screw, l9...Second adjustment screw, 2o.
...Sewing machine body. Patent applicant: Katsumi Shokai Co., Ltd. Agent patent attorney: 2 blueprint postcards 112 Figure 3

Claims (1)

[Claims] (1) A housing (8) that is removably attached to the sewing machine body (20), a fixed knife (9) that is housed and fixed in the housing (8) and has a fixed cutter (9a), and a fixed knife (9) that is housed and fixed in the housing (8) and has a fixed cutter (9a); 9), the movable cutter (10b) is slidably housed in the housing (8) and cooperates with the fixed cutter (9a) of the fixed knife (9) to cut the cloth (5). A movable knife (10) and a movable cutter (1) housed in the housing (8) and of the movable knife (10).
0b) of the fixed knife (9) to slide into contact with the fixed cutter (9a) of the fixed knife (9); A movable knife driving means (1) that slides on the knife (9) and cuts the cloth (5) by causing the fixed cutter (9a) and the movable cutter (10b) to work together.
6) A cloth cutting device for a sewing machine, comprising: