JPS5916796B2 - Sewing machine with attachment for cutting edge of fabric - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention is removably fixed to a sewing machine bed, and in the fixed state, cuts the edge of a workpiece cloth prior to oversewing using a cutting operation section consisting of a movable blade and a fixed blade. This invention relates to a sewing machine equipped with a fabric edge cutting attachment.

Unlike general household sewing machines, the small-sized overlock sewing machines (so-called small lock sewing machines) that are becoming popular these days are not used for ordinary sewing other than oversewing lines, but are only used for oversewing. Since this is a dedicated machine, a cloth waste discharge path is formed in the front of the sewing machine bed, and the cloth waste cut by the cutting operation part of the fabric edge cutting mechanism is discharged through the discharge path to the front side of the sewing machine bed. It looks like this.

However, in conventional home sewing machines that are equipped with a fabric edge cutting attachment to perform overlock sewing as described above, normal sewing work is often performed with the attachment removed. Therefore, in consideration of the ease of sewing work and maintaining the appearance of the sewing machine, a passage for actively discharging cloth waste is not formed in the front of the sewing machine bed unlike in the case of front-end and mold-lock sewing machines. A guide member such as a cloth handling piece is provided in the vicinity of the cutting operation part of the cloth edge cutting attachment, and the fabric scraps cut in the cutting operation part are configured so as not to enter the seam forming part, that is, the vicinity of the needle drop point. There is.

Therefore, as the oversewing operation progresses, the number of fabric scraps stagnant on the sewing machine bed increases, and there is a risk that the fabric scraps may enter the seam forming section and impede the sewing operation.

Therefore, it is necessary to frequently remove cloth scraps from the sewing machine bed during sewing, which is extremely complicated and reduces sewing efficiency.

This invention was made in view of the above circumstances, and
The purpose is that when the fabric edge cutting attachment is fixed on the sewing machine bed, a fabric waste discharge path is formed on the front side of the sewing machine bed like in conventional small lock sewing machines, and the fabric waste that is cut in the cutting operation part of the attachment is removed. is quickly discharged without being stagnated in the cutting operation section, which reliably prevents the risk of interfering with the overlocking work.Also, the appearance of the sewing machine can be maintained with the material edge cutting attachment removed. To provide a new sewing machine capable of performing normal sewing work as before without damaging the sewing machine.

Below, the configuration of a sewing machine embodying the present invention will be explained with reference to the drawings. In the drawing, 1 is a sewing machine arm, and as shown in FIGS. 1 and 2, a needle bar and a presser foot are attached to the head of the sewing machine. A sewing machine needle 2 and a presser foot 3 are attached to the holder.

Reference numeral 4 denotes a sewing machine bed, on the upper surface of which a top plate 5 is fixed, and on the left side of the front surface, a can lid 6 is mounted at its lower end so as to be rotatable in opening and closing by means of a mounting shaft 7.

Reference numeral 8 denotes a throat plate fixed to the front end of the upper surface of the upper plate 5 so as to cooperate with the upper plate 5 to form a workpiece support surface, and as shown in FIG. A needle hole 8a for zigzag sewing and an opening 8b for a feed dog 9 are formed.

Reference numeral 10 denotes a horizontally long mounting opening formed in the front portion of the throat plate 8 on the right side, and as shown in FIGS. 2 and 3, approximately the left half of the front edge thereof is opened toward the front. At the same time, a horizontal support plate portion 10b having a pair of fitting holes 10a is formed within the opening 10.

Reference numeral 11 denotes a cover plate that is removably fitted and fixed to the opening 10 of the throat plate 8 during normal sewing work, as shown in FIG. It is designed to form a

Reference numeral 12 denotes a recess formed in the upper right-hand side of the front surface of the can lid 6 so as to correspond to the front edge opening of the mounting opening 10, and is shown in FIGS. 1, 2, and 4. As shown in FIG. 6, a support surface 12a that slopes low toward the front is formed at the lower opening edge, and a regulating protrusion 12b is formed protruding from the right opening edge.

Reference numeral 13 denotes an opening/closing lid rotatably attached to the can lid 6 by a mounting shaft 14 at its lower end so as to releasably cover the recess 12, as shown in FIGS. 1, 3, and 4. As shown, a hooked piece 13a having an arcuate surface is formed protrudingly on the left side surface, and when it is rotated in the direction of opening the recess 12, the first
As shown in FIG. 6, the inclined support surface 1 at the bottom of the recess 12
2a and is held in a forwardly tilted state and rotated in a direction to close the recess 12, the regulating protrusion on the right side of the recess 12 as shown in FIGS. 2 and 7. 1
2b, and is arranged so as to form the same surface as the front side surface of the can lid 6.

15 is a can lid 6 near the left opening edge of the recess 12;
As shown in FIG. 4, FIG. 5, and FIG. A horizontally long through hole 15b is formed.

16 is a pair of upper and lower engagement claw pieces 16a protruding from the rear surface, which are inserted into the through hole 15b against its own elasticity to engage with the rear surface of the opening edge thereof, and are inserted into the mounting recess 15 in the left-right direction. The operation knob is slidably attached to the operating knob, and a hook portion 16b is formed on the right end of the operation knob. The portion 16b engages with the latched piece 13a on the left side of the opening/closing lid 13 from the front,
The opening/closing lid 13 is latched and held in the closed position.

17 is a cover fixed to the rear surface of the engagement claw piece 16a of the operating knob 16 by a mounting screw 18; 19 is a compression spring interposed between the left edge of the through hole 15b of the mounting recess 15 and the mounting screw 18; The operating knob 16 is urged to move rightward toward the locking position shown in FIG.

Next, remove the lid plate 11 and open the opening/closing lid 13 to open the mounting opening 10 of the throat plate 8 and the recess 1 of the can lid 6.
To explain the structure of the cloth edge cutting attachment which is removably fixed in the vicinity of the attachment opening 10 with the attachment 20 open, the cloth edge cutting attachment 20 is attached to the support plate portion 10b inside the attachment opening 10 when attached. The attachment frame is supported, and as shown in FIGS. 3 and 4, a pair is provided on the lower surface of the attachment frame for fitting into the fitting hole 10a of the support plate portion 10b to position the attachment frame 20 at a predetermined position. A positioning pin 21 is provided protrudingly.

Reference numeral 22 denotes a locking lever rotatably attached to the attachment frame 20. By rotating the locking lever 22, a locking portion 22a at the lower end of the locking lever 22 is secured to the upper plate 5. The attachment frame 20 is relatively engaged with the mating shaft 23 from below to fix the attachment frame 20 at a predetermined position on the throat plate 8.

Reference numeral 24 denotes a protruding arm formed to protrude leftward from the front left side of the attachment frame 20, and as shown in FIG.
a is formed, and a vertical guide surface 2 is formed at the bottom of the front surface.
4b is formed, and as is clear from FIGS. 1, 3, and 6, when the attachment frame 20 is in a fixed arrangement state, it is close to the front side of the can lid 6 at the front of the sewing machine bed 4, and is connected to the front side of the can lid 6. The guide surface 24b extends in parallel and is exposed forward from the recess 12 of the can lid 6 so as to be disposed on the same plane as the front side surface of the can lid 6.

Reference numeral 25 denotes a fixed blade having a roughly L-shaped front face fixed to the lower surface of the left end of the protruding arm 24 by two mounting screws 26 at the base end, and a blade portion formed on the upper edge thereof is attached to the throat plate 8. It is located close to the cloth feed side with respect to the drop point of the sewing machine needle 2, that is, the needle hole 8a, on substantially the same plane as the upper workpiece support surface.

Reference numeral 27 denotes a drive shaft of a cutting operation mechanism rotatably supported through the attachment frame 20, which is connected to the inside of the sewing machine bed 4 via an appropriate connection mechanism (not shown) when the fabric edge cutting attachment is in a fixed arrangement state. The sewing machine is connected to a movement mechanism such as a shuttle drive shaft installed in the sewing machine, and is rotated back and forth as the sewing machine is operated.

28 is a planar shape L fixed to the left end of the drive shaft 27.
The letter-shaped drive arm 29 is a movable blade fixed to the left end of the drive arm 28 so as to cooperate with the fixed blade 25 to form a cutting operation part, and the lower end thereof has a blade part and a guide piece. 29a is formed and is moved up and down as the drive shaft 27 reciprocates to cut the edge of the work cloth prior to oversewing.

30 is a mounting surface 24 on the front surface of the protruding arm 24 using two mounting screws 31 so as to be close to the fixed blade 25 and movable blade 29.
A cloth waste discharge plate fixed to a, and shown in FIGS.
As shown in Figures to Figure 6, the movable blade 2
A notch 30a is formed on the upper edge to allow the vertical movement of the can lid 6, and a notch 30a is formed on the upper edge of the can lid 6 to be located above the upper surface of the throat plate 8 when the cloth edge cutting attachment is fixedly arranged. The eaves portion 30b extends forward to almost the same plane.
is formed.

Reference numeral 30c denotes a cloth waste discharge plate formed in a curved shape on the front surface of the cloth waste discharge plate 30, from the eave part 30b on the upper edge thereof, through the vicinity of the rear end of the blade part of the movable blade 29, to the lower edge of the discharge plate. The lower edge of the surface is located below the upper surface of the throat plate 8 when the cloth edge cutting attachment is fixedly arranged, and is located in the recess 12 of the can lid 6 opened by the opening/closing lid 13 as described above. The cloth scraps cut by the cutting operation section, which is arranged on the same plane as the front side of the can lid 6 and consists of the movable blade 29 and the fixed blade 25, are guided to this cloth scrap discharge surface 30c, and the can lid 6 The sewing machine bed 4 is configured to be actively discharged through a recess 12 toward the lower front side of the sewing machine bed 4.

The operation of the sewing machine constructed as described above will now be described.

Now, FIG. 2 and FIG. 1 show that the lid plate 11 is fitted into the mounting opening 10 on the throat plate 8, and the opening/closing lid 13 on the front side of the can lid 6 is latched and held in the closed position. 10 and the recess 12 of the can lid 6 are shown closed.

In this state, the upper surface of the lid plate 11 is located on the same plane as the throat plate 8, and together with the throat plate 8 and the upper plate 5, a workpiece support surface is formed, and the front side surface of the opening/closing lid 13 is located on the same plane as the throat plate 8. Since it is located on the same plane as the lid 6 and the front side surface of the sewing machine bed 4, normal sewing work can be smoothly performed using the workpiece support surface as in conventional household sewing machines.

Next, when performing overlock stitching while cutting the edge of the workpiece cloth using the fabric edge cutting attachment, first remove the cover plate 11 from the mounting opening 10 of the throat plate 8, and then The mounting opening 10 is opened.

Also, when the operating knob 16 on the front surface of the can lid 6 is moved to the left against the action of the compression spring 19, the operating knob 1
6 is detached from the hooked piece 13a of the opening/closing lid 13, and if the opening/closing lid 13 is rotated to open in this state, the first
As shown in the drawings and FIG. 6, the opening/closing lid 13 abuts against the support surface 12a at the lower end of the recess 12 and is held in a downwardly inclined state, thereby opening the recess 12 widely.

After that, when the attachment frame 20 is fixedly arranged near the attachment opening 10 of the throat plate 8, the protruding arm 24 approaches the front side of the can lid 6 and extends parallel to the front side, and the guide surface 24b at the lower end of the front side extends. is exposed forward from the recess 12 and is disposed on the same plane as the front side of the can lid 6, and the fixed blade 25 is on the same plane as the workpiece support surface on the throat plate 8, and the sewing machine needle 2 , that is, the needle hole 8a of the throat plate 8.
It is placed close to the cloth feeding side.

In this state, as shown in FIGS. 1 and 6□, the cloth waste discharge surface 30c on the front surface of the cloth waste discharge plate 30
In the recess 12 , it extends from a position above the upper surface of the throat plate 8 to a position below the upper surface of the throat plate 8 in a state close to the cutting operation section consisting of the movable blade 29 and the fixed blade 25 , and near the lower end of the recess 12 . will be arranged to contact you.

In addition, in the fixed arrangement state of the attachment frame 20, the cutting operation mechanism including the drive shaft 27 provided inside the attachment frame 20 is connected to the movement mechanism such as the hook drive shaft provided in the sewing machine bed 4, so that the When the sewing machine is operated, the movable blade 29 is reciprocated up and down, and cooperates with the fixed blade 25 to cut the edge of the work cloth, and an overlock stitch is formed on the cut edge.

During this sewing work, cloth scraps cut in the cutting operation section consisting of the movable blade 29 and the fixed blade 25 are guided to the discharge surface 30c of the cloth waste discharge plate 30 and are guided to the recess 1 of the can lid 6.
The sewing machine bed 4 is actively discharged from inside 2 to the front of the sewing machine bed 4, and falls downward along the guide surface 24b of the projecting arm 24, etc.

Further, in this embodiment, since the eaves portion 30b is formed on the upper edge of the cloth waste discharge plate 30, there is no possibility that cloth waste is moved upward from the cutting operation section along the cloth waste discharge surface 30c. Even if the cloth waste is removed, there is no fear that the cloth waste will pass over the upper end of the discharge plate 30 and enter onto the throat plate 8 at the rear, and it will be surely discharged to the front of the sewing machine bed 4.

Therefore, there is no fear that cloth waste will stay in the cutting operation section or enter the seam forming section, that is, the vicinity of the needle drop point, and cutting of the workpiece cloth and seam formation can be performed smoothly and reliably. At the same time, there is no need to remove cloth waste during sewing, thereby improving sewing efficiency.

Note that the present invention is not limited to the configuration of the embodiment described above, and for example, a cloth waste discharge surface may be directly formed on the front surface of the protruding arm 24, or the sewing machine bed 4, the opening/closing lid 13, the cloth edge cutting attachment, It is also possible to freely change and embody the structure of each part without departing from the spirit of the invention, such as by arbitrarily changing the structure of the protruding arm 24 and the like.

As is clear from the above description, according to the present invention, when the fabric edge cutting attachment is fixed on the sewing machine bed, a fabric waste discharge path is formed on the front side of the sewing machine bed like in a conventional small lock sewing machine. Cloth scraps cut in the cutting operation section of the attachment are quickly discharged without being stagnated in the cutting operation section, and the oversewing work can be performed smoothly and efficiently without any hindrance. When the sewing machine attachment is removed, the sewing machine has an excellent effect of allowing normal sewing work to be performed as before without damaging the appearance of the sewing machine.

[Brief explanation of drawings]

Fig. 1 is a partial perspective view showing a sewing machine embodying the present invention with a fabric edge cutting attachment mounted on the sewing machine bed, and Fig. 2 shows a state in which normal sewing is performed with the fabric edge cutting attachment removed. FIG. 3 is a partial plan view showing the upper surface of the sewing machine bed shown in FIG. 1, FIG. 4 is a partially cutaway partial front view, and FIG. Enlarged sectional view along line 5, No. 6
The figure is a partially enlarged sectional view taken along the line 6-6 in FIG. 4, and FIG. 7 is a partially enlarged sectional view taken along the line 7-7 in FIG. Sewing machine arm 1, sewing machine needle 2, sewing machine bed 4, can lid 6
, throat plate 8, mounting opening 10, recess 12, opening/closing lid 13, attachment frame 20, protruding arm 24, fixed blade 25,
Movable blade 29, cloth waste discharge plate 30, cloth waste discharge surface 30c.

Claims (1)

[Scope of Claims] 1. A cutting actuator comprising a movable blade and a fixed blade, which is removably fixed to the sewing machine bed, and in the fixed state is connected to the movement mechanism of the sewing machine to drive the movable blade. In a sewing machine equipped with an attachment for cutting filter cloth ends, the sewing machine bed is provided with an opening/closing lid that releasably covers a part of the front side surface of the sewing machine bed, and the attachment frame is provided with an opening/closing lid that covers a part of the front side surface of the sewing machine bed in the fixed state. A protruding arm is provided adjacent to the protruding arm and extends substantially parallel to the front side thereof, and the fixed blade is fixed to the tip of the protruding arm so as to be located on the cloth feeding side with respect to the needle drop point of the sewing machine. The arm is close to the fixed blade, has an upper edge located above the top surface of the sewing machine bed, and a lower edge located below the top surface of the sewing machine bed, so that it is connected to the front opening of the sewing machine bed by the opening/closing lid. A communicating cloth waste discharge surface is provided, and the cloth waste cut by the cutting operation section is guided to the cloth waste discharge surface and is discharged through the front opening of the sewing machine bed. sewing machine. 2. The sewing machine according to claim 1, wherein the opening/closing lid is rotatably attached to a can lid provided on the sewing machine bed. 3. The sewing machine according to claim 1 or 2, wherein the cloth waste discharge surface is formed by a cloth waste discharge plate fixed to the projecting arm. 4. The sewing machine according to any one of claims 1 to 3, wherein the cloth waste discharge surface is formed in a curved shape.