CZ300966B6 - Apparatus for cutting-through material for sewing machine - Google Patents

Abstract

In an apparatus (1) for cutting-through, a material for a sewing machine (100) is the sewed material placed between a blade (12) and the blade (12) receptacle (13). The blade (12) and/or the blade (12) receptacle (13) can move one to another for cutting-through the sewed material and producing hole parts at the sewed material. The cutting-through device (1) comprises a drive shaft (8), rotatably supported by an arm (101c) of the sewing machine, and a drive element for rotating the drive shaft (8), whereas the drive element includes a motor (2) and an air cylinder (16). The cutting-through device (1) further comprises a tooth rail member (10), fitted to the drive shaft (8), for conversion of the rotatory motion of the drive shaft (8) to the linear motion and for securing the blade (12) and/or the blade (12) receptacle (13) movement for touching the blade (12) to one another. The drive element is arranged in a position, shifted in transverse direction from the axis, passing through the blade (12) and a needle.

Description

The invention relates to a material cutting machine for a sewing machine, which is used as part of a sewing machine to perform buttonhole eyelet buttonhole for forming a buttonhole, for example, to form a buttonhole portion forming a buttonhole on the material.

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BACKGROUND OF THE INVENTION

Referring now to FIG. 11, a known buttonhole sewing machine 200 of the above type will now be described.

The buttonhole sewing machine 200 for performing the overlock stitch at a buttonhole, such as a buttonhole loop, which is formed on the material (on the sewn object), either previously or later, comprises a frame 201 of the sewing machine 200 consisting of a base portion 201a, from the stand portion 201b, erected from the base portion 20e, and the arm portion 201c extending from the stand portion 201b opposite the base portion 201a. in which the main components are stored.

A needle bar 204 provided with a needle 203 at its lower end is disposed on the outer surface of the top of the arm portion 201c. The needle bar 204 is moved vertically by a needle mechanism 204 disposed in the arm portion 201c, which mechanism is not shown, the needle bar 204 also pivoting in the cross direction for each stitch by the needle pivot mechanism 203, which is arranged in the arm portion 201c and which is also not shown.

Depending on the vertical movement and the pivoting movement of the needle bar 204, the gripper drive mechanism (not shown), which is arranged in the base portion 201a, drives the gripper (not shown) such that the overlock stitch is formed around the buttonhole their cooperation.

A feed device (not shown) drives the feed bar 206, to which the material is associated, around the punched hole shape of the buttonhole.

In addition, the buttonhole sewing machine 200 includes a material cutting device 215 for forming a buttonhole eyelet on the material.

The known material cutting device 215 converts the linear movement of the cylinder disposed in the stand portion 201b to either a knife 215a or a knife engaging device 215a arranged at the top of the arm portion 201c via a coupling mechanism, moving one of these components towards the other. arranged in an opposite position on the top surface of the base portion 201a so that they correspond to each other, with the material interposed therebetween, thereby cutting the material and forming a buttonhole eyelet. The blade 215b of the knife 215a is rotated in a direction along the arm portion 201c of the buttonhole sewing machine 200c.

On some materials it is necessary to create a set of buttonhole stitches arranged on the same straight line. In this case, moving the material in the same direction as the direction of the knife edge, i.e. along the axis of the arm portion (hereinafter referred to as the knife axis) passing through the center of the needle and knife each time the buttonhole loop is formed,

- 1GB 300966 B6 to improve sewing efficiency. In order to move the material in sufficient stroke along the knife axis, it is necessary to prevent the upright portion from overlapping with the knife axis in the base portion.

However, in a material cutting device, an energy source, such as an air cylinder and a coupling mechanism, must be provided on the axis to prevent damage to the coupling mechanism due to shear.

In addition, the range in which the energy source, such as the air cylinder and the coupling mechanism, is pivoted extends outside the arm portion of the sewing machine toward the base portion. That is why the stand part is so thick that it can be stored there.

Under certain conditions, the stand portion cannot be removed from the knife axis. It is therefore impossible to move the material in sufficient stroke along the knife axis.

Furthermore, in the material cutting device, the coupling mechanism is strong to fully maintain its stiffness. The swivel range of the air cylinder must also be observed. As a result, the volume occupied by the material cutting device in the buttonhole sewing machine increases. As a result, the dimensions of the entire sewing machine are also increased.

In addition, the center of the needle corresponds to the knife axis in order to maintain work efficiency. The material cutting device is therefore arranged to overlap with the vertical needle bar drive mechanism and the needle pivot mechanism in the vertical direction. A disassembly procedure is provided for this purpose. If the material cutting device is to be disassembled for maintenance, the vertical needle bar drive mechanism and the needle pivot mechanism must also be disassembled.

SUMMARY OF THE INVENTION

SUMMARY OF THE INVENTION It is an object of the present invention to provide a material cutting device for a sewing machine in which the force transmission mechanism is disposed at a position distant from the knife axis to form a thin stand portion; move in a sufficient stroke in the same direction as the knife direction, whereby the size of the sewing machine can be reduced due to the reduction of the volume occupied, and furthermore it is very easy to disassemble.

In accordance with a first aspect of the invention, the above object has been achieved by providing a material cutting machine for a sewing machine in which the sewn material is arranged between the knife and the knife bearing device, wherein the knife and / or the knife bearing device being movable relative to each other for cutting the sewn material and forming a pinhole portion on the sewn material, the cutting device comprising:

a drive shaft rotatably mounted within the arm portion of the sewing machine, a drive member for rotating the drive shaft, the drive member comprising a motor and an air cylinder, and a rack member attached to the drive shaft to convert the rotary motion of the drive shaft to linear motion and to move the blade; / or a device for engaging the knife against one another, the drive member being arranged in a position offset transverse to the axis passing through the knife and the needle.

-2GB JUU7OO DO

In the present invention, either the knife or the knife abutment device moves toward the second component, the power source being a network transmitted from the rotating means by the drive shaft and the moving means. In this way, a pinhole part is created on the sewn object.

According to the present invention there are therefore no obstacles on the axis of the arm portion passing through the center of the needle and the knife. As a result, the sewn object can be moved in the direction in which the hole is to be formed by the knife.

In addition, the volume occupied by the material cutting device itself can be reduced due to the use of the drive shaft. Therefore, the overall size of the sewing machine can be reduced.

In addition, the drive shaft is disposed on an axis of the arm portion extending through the center of the needle and knife, i.e. in a position displaced from the center of the needle. As a result, the rotational means i and the movement means can be displaced from the vertical needle bar drive mechanism and the needle pivot mechanism. Therefore, the material cutting device can be dismantled independently of the vertical needle bar drive mechanism and the needle pivot mechanism.

This makes maintenance very easy.

A second aspect of the present invention is directed to the aforesaid material cutting machine for a sewing machine, further comprising:

a receiving member for rotating the drive shaft in the direction of cutting through the sewn material, and a return spring for storing force by twisting and deforming the drive shaft due to rotation when the knife corresponds to the position of the knife engaging device and thereby applying force to the knife or knife engaging device wherein the suture material is completely cut through by the action of this net.

In this case, even if the power of the rotating means is reduced, the suture can be completely cut through. By reducing the size of the power source of the rotating means, the material cutting device as well as the entire sewing machine provided with the material cutting device can be reduced accordingly.

A third aspect of the present invention is directed to a material cutting machine for a sewing machine, further comprising:

a rotary member for rotation about the drive shaft in communication with the drive member, a receiving member attached to the drive shaft to engage the rotary member during rotation of the rotary member in the cutting direction of the sewn material, and a driving member for driving the drive shaft in opposite direction to the cutting direction of the sewn material during rotation of the drive shaft in the direction of the sewn material.

According to a third aspect of the present invention, when the drive means rotates the rotating member in the material cutting direction, the rotating member presses the receiving member and rotates the receiving member together with the drive shaft in the material cutting direction while moving the knife or the knife-bearing device for cutting of sewn object.

In addition, when the drive means rotates the rotating member in the opposite direction, the rotating member rotates in such a direction that it moves away from the receiving member, the drive shaft rotating in the opposite direction by the driving force transmitted from the driving means as a result. 300966 B6, which moves the knife or the knife engaging device in such a direction that it moves away from the workpiece.

Accordingly, in accordance with a third aspect of the present invention, the drive means can be prevented from forcibly rotating the drive shaft and the moving means in the opposite direction, thereby causing damage to the drive means. In this way, increased reliability of the material cutting device is guaranteed.

io Overview of figures in drawings

The invention will now be explained in more detail by way of examples of specific embodiments thereof, the description of which will be given with reference to the accompanying drawings, in which:

Fig. 1 is a schematic side elevational view showing a buttonhole sewing machine in which a material cutting device according to one embodiment of the present invention is applied and part thereof is removed;

Fig. 2 is a schematic plan view showing a buttonhole sewing machine in a state where the material cutting knife is lowered and a portion thereof is removed;

Fig. 3 is a front elevational view showing a buttonhole sewing machine, with a portion thereof removed;

Fig. 4 is a rear view showing a buttonhole sewing machine in which the material cutting knife is lifted and part thereof is removed;

Fig. 5 is a schematic side elevational view showing a buttonhole sewing machine in which an alternative embodiment of the material piercing apparatus is applied, with a portion thereof removed;

Fig. 6 is a schematic plan view showing a buttonhole sewing machine, with a portion thereof removed;

Fig. 7 is a rear view showing a buttonhole sewing machine with part removed;

Fig. 8 is a schematic side elevational view showing a buttonhole sewing machine 40 in which another alternative embodiment of the material piercing apparatus is applied, with a portion thereof removed;

Fig. 9 is a schematic plan view showing a buttonhole sewing machine, with a portion thereof removed;

Fig. 10 is a rear view showing a buttonhole sewing machine with part removed; and Fig. 11 is a schematic perspective view showing a sewing machine for punching buttonhole holes, in accordance with a commonly known exemplary embodiment.

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DETAILED DESCRIPTION OF THE INVENTION

The material cutting device 1 according to the first embodiment of the present invention will now be described in more detail below with reference to the figure of Figures 1 to 4.

The buttonhole sewing machine 100 has almost the same construction as the sewing machine in the known exemplary embodiment, except for the material-cutting device and the shape of the stand portion.

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The material cutting device 1 has the following construction.

The motor 2 is disposed on the opposite side of the stitch forming portion, such as a needle, rearwardly away from the operator, its output shaft being mounted upwardly to the base portion 101a.

The rod-shaped spindle 4 connected to the output shaft of the motor 2 via the gear mechanism 3 has a lower and upper end rotatably mounted on the upper surfaces of the base portion 101a and the arm portion 101c by respective bearings 10ld as shown in FIG.

The bushing 5 is fixed by means of a screw to the nut 4a screwed into the ball screw 4, and moves vertically together with the ball screw nut 4a during rotation of the ball screw nut 4a 4. The guide shaft 6, which is the pivot stop of the bush 5, a guide 5a attached to the housing 5, penetrating the housing 5 movably in a vertical direction, as shown in FIG. 4.

The drive shaft 8 is mounted horizontally and rotatably in the bearing bearing 11a on the operator-side end face in the arm portion 101c. The coupling mechanism 7, comprising a pair of coupling arms 7a and a single coupling arm 7b, pivotally connected via shafts M, has a coupling arm

7a is pivotably coupled to the housing 5, the second link arm 7b being pivotably coupled to the drive shaft 8.

At the end side of the drive shaft 8 near the stitch forming portion, the rack member 10 engages the gear 9 mounted on the drive shaft 8 and moves vertically, with its lower end protruding vertically from the arm portion 101c.

The knife 12 is attached to the lower end of the rack member 10 by means of a clamping plate 11 for attaching the knife 12. The knife engagement device 13 is arranged on the upper surface of the base portion 11a so that it corresponds to the knife 12.

As shown in Figures 2 and 4, the receiving member 14 is attached to one end side of the drive shaft 8 and abuts the lower portion of the link arm 7b.

Further, as shown in Figures 1 and 2, the spring (drive member) 45 is intended to be twisted and deformed together with the rotation of the drive shaft 8 to accumulate a force to press the drive shaft 8 back in a direction opposite to the rotation direction. is used for a coil return spring 8a wound on the drive shaft 8.

As further shown in Figure 3, the rack member W is received in a transfer 50 of a metal part 15 attached to the arm portion 101c so that a horizontal position can be adjusted. The transfer metal part 15 has an almost cylindrical shape and is provided with a notch on the gear side 9. Furthermore, the convex portion 10a is arranged at two locations on the outer surface of the rack member 10 in the circumferential direction, the inner surface of the transfer metal part 15 having a groove 15a. supporting the convex portion 10a sliding vertically,

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As shown in FIG. 2, for example, the rack member 10 and the transmission metal member 15 are arranged on the same rear side as the ball spindle 4 with respect to the drive shaft 8.

WITH

The material cutting device 1 transmits the driving force of the motor 2 to the drive shaft 8 by means of the coupling mechanism 7. Therefore, members such as the ball screw 4 and the guide shaft 6 can be arranged in the transverse direction (rear) of the drive shaft 8, i.e. from the knife axis (needle center) of the knife Πιο

Furthermore, the coupling mechanism 7 for transmitting the rotational movement of the ball screw 4 to the drive shaft 8 can be mounted in the arm.

As shown in the figures of Fig. 3 and Fig. 4, the pedestal portion 101b is made thin and the lower portion on the operator side can be excavated. As a result, the portion disposed on the axis passing through the center of the needle and the knife engaging device 12 is enlarged over the upper surface of the base portion 101a so that the material can move along the axis.

In addition, the driving force of the motor 2 is transmitted to the side of the stand portion 101b, i.e. from the rear end of the arm portion 101c to the top of the arm portion 101c via only the drive shaft 8. Thus, the size of the drive transmission mechanism can be reduced. As a result, the drive transmission mechanism can be accommodated in the arm portion 101c without the arm portion 101c having to be strong,

Therefore, even if the upright portion 101b is weak as described above, the shoulder portion 101c may be weak and light. Therefore, strength deficiencies can be eliminated, and vibration can be prevented.

Furthermore, since each driving force transmission member arranged from the motor 2 to the coupling mechanism 30 of the slider 7 and the gear 9 can be displaced from the knife axis of the knife 12, the material punching apparatus can be moved away from the vertical needle rod drive mechanism and the mechanism. swinging needle movement. Thus, the material punching device 1 can be disassembled independently of the vertical needle bar drive mechanism and the needle pivot mechanism so that maintenance can be carried out easily.

The functions and operation of the material cutting device will now be described.

As shown in FIG. 1, when the motor 2 is rotating, the ball screw nut 4a and the sleeve 5 are lowered due to the rotation of the ball spindle 4. Together with the drop of the sleeve 40 and 5 the coupling arm 7b of the coupling mechanism 7 is pulled by the coupling arm 7a. so that it rotates clockwise in FIG. 4 so that the link arm 7b pushes the top surface 14a of the receiving member 14 down. As a result, the receiving member 14 rotates together with the drive shaft 8 in the clockwise direction of FIG. 4. In this case, the coil return spring is also twisted and deformed, thereby accumulating the force for rotation of the drive shaft 8 in the counter-clockwise direction. clockwise rotation in FIG. 4,

When the drive shaft 8 rotates in the clockwise direction of FIG. 4, i.e. counterclockwise in FIG. 3, the gear 9 arranged on the other end side of the drive shaft 8 rotates to push down the rack member 10 so that the knife 12 descends towards the knife-bearing device 13 and then rests on the knife-bearing device 13, the material being interposed therebetween.

After resting the blade 12 on the blade-engaging device 13, the motor 2 further rotates to twist and deform the drive shaft 8, as a result of which the force is stored. Knife force

The -6GL · JUU7UO DO down is thus raised so that the material is completely cut to form the pinhole. Therefore, even if the size and power of the motor 1 are reduced, the knife 12 can be pressed in the direction of zero with sufficient force.

Furthermore, if the drive shaft 8 is to be shortened and deformed for the accumulation of force, the convex portion 10a of the rack member 10 is moved and lowered in a groove 15a on the inner surface of the transfer metal part 15. The rack member 10 is therefore pushed down by the gear 9 without rotation .

If the buttonhole eyelet is formed on the material in the direction of the knife axis of the knife 12 and the knife-bearing device 12, the motor 2 rotates in the opposite direction so that the ball screw nut 4a and the sleeve 5 move upwards in FIG. As a result, the receiving member 14 and the drive shaft 8 do not receive a thrust from the coupling mechanism 7, so that they move independently of the coupling arm 7b.

The drive shaft 8 is rotated together with the gear 9 via a coil return spring counterclockwise in FIG. 4, so that the rack member 10 and the knife 12 are pulled up and returned.

The members arranged from the receiving member M to the knife 12 are not driven by the driving force of the motor 2, but by the spring force of the coil return spring 8a during the return. Therefore, even if the motor 2 is not operating properly and is overloaded, it will not be damaged.

By moving the material along the knife axis 12 to repeat the operation, a plurality of buttonhole stitches in the knife axis direction are continuously executed on the knife axis.

Instead of the embodiment described above, a buttonhole sewing machine 120 as shown in Figures 5, 6 and 7 may also be used.

Instead of the motor 2, an air cylinder 16 is used as the driving source. In this case, the piston 16a of the air cylinder 16 is directly attached to the coupling arm 7a of the coupling mechanism 7 without the use of the ball screw 4 and the housing 5.

In addition, a buttonhole sewing machine 140 as shown in Figures 8, 9 and 10 may also be used.

Instead of the coupling mechanism 7, the worm gear 17 can be rotatably attached to the drive shaft 8 such that its lower end can rest against the upper surface of the receiving member 11, and the worm gear 18 can be attached to the shaft 18a arranged in place of the ball screw 4 engages the worm wheel JJ.

In this case, if the motor 2 rotates the worm gear 18 through the shaft 18a in one direction, the worm wheel 17 rotates clockwise in FIG. 10 and presses the receiving member 14 downwards. In addition, when the motor 2 rotates the worm gear 18 in the opposite direction, the worm wheel 17 opens the receiving member H.

Industrial applicability

According to a first aspect of the present invention there is no obstruction on the axis of the arm portion passing through the center of the needle and the knife, i.e. the knife axis. As a result, the sewn object can be moved in the same direction as the knife direction with sufficient stroke.

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In addition, the volume occupied by the material cutting device itself can be reduced by using a drive shaft. The overall size of the sewing machine can thus be reduced.

Further, the material cutting device may be disassembled independently of the vertical needle bar drive mechanism and the needle pivot mechanism. Therefore, the ease of maintenance can be increased.

According to a second aspect of the present invention, even if the power of the rotating means is reduced, the sutured article can be completely cut through. By reducing the size o of the driving source of the rotating means, the size of the material cutting device as well as the sewing machine provided with the material cutting device can also be reduced accordingly.

In accordance with a third aspect of the present invention, the drive means may be prevented from forcibly rotating the drive shaft and the movement means in the opposite direction, so that they could be damaged. The reliability of the material cutting device is thus significantly increased.

Claims (3)

A device (1) for cutting a material for a sewing machine (100), wherein the sewn material is arranged between the knife (12) and the knife engaging device (13), wherein the knife (12) and / or the device (12) is arranged. 13) for engaging the knife (12) are movable to each other for cutting the sewn material and forming a pinhole portion on the sewn material, the cutting device (1) comprising: 30 a drive shaft (8) rotatably mounted in an arm portion (101c) of the sewing machine (100), a drive member for rotating the drive shaft (8), the drive member comprising a motor (2) and an air cylinder (16); 35 a rack member (10) attached to a drive shaft (8) for converting the rotational movement of the drive shaft (8) into a linear motion and for moving the knife (12) and / or the means (13) for engaging the knife (12) characterized in that the drive member is arranged in a position offset in a transverse direction from the axis passing through the knife (12) and the needle. Material cutting device (1) for a sewing machine (100) according to claim 1, characterized in that it further comprises: a receiving member (14) for rotating the drive shaft (8) in the direction of cutting through the sewn material, and a return spring (8a) for storing force by twisting and deforming the drive shaft 50 (8) as a result of rotation when the knife (12) corresponds to the position of the knife-bearing device (12) and thereby to apply a force to the knife (12) or the knife-bearing device (13), The sewn material is completely cut through by this force. -8CL JUU7OO DO The material cutting device (1) for a sewing machine (100) according to claim 1, further comprising: a rotary member for rotation about the drive shaft (8) in communication with the drive member, a receiving member (14) attached to the drive shaft (8) to engage the rotary member during rotation of the rotary member in the cutting direction of the sewn material, and driving the drive shaft (8) in the opposite direction with respect to the direction of cutting of the sewn material while the drive shaft (8) rotates in the direction of the sewn material.