KR100871596B1 - Sewing machine with thread cutter - Google Patents

Abstract

The present invention provides a movable blade drive mechanism in a thread cutting device comprising a movable blade capable of reciprocating oscillation in a horizontal plane, a fixed blade, and a thread fitting plate that can elastically support a thread end after cutting with a movable blade. A driving connection link whose one end is pivotally supported at a position slightly displaced from the pivotal axis of the movable scalpel and extends in the cylindrical bed toward the cloth feed direction, and is fixedly installed at the proximal end of the cylindrical bed to provide the driving link link. By constructing an air cylinder having a movable rod portion pivotally supported at the other end of the belt, the number of components can be reduced to reduce costs, and the handling of fabric during sewing can be easily carried out, improving workability and sewing miss. It is possible to achieve reduction.

Thread hook, needle plate, movable knife presser, movable blade drive mechanism, drive link, movable rod, tubular bed, hydraulic cylinder, sewing machine with thread cutter.

Description

Sewing machine with thread cutting device {SEWING MACHINE WITH THREAD CUTTER}

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic perspective view of an entire sewing machine of a three needle cylindrical type with a thread cutting device according to the present invention.

2 is an exploded perspective view of components of a thread cutting device in the same sewing machine.

Fig. 3 is a plan view of a part of the sewing machine in the transverse direction and centered around the main part of the thread cutting device.

(A) is an enlarged longitudinal cross-sectional view in the X-X line | wire of FIG.

FIG. 4B is an enlarged view of part B of FIG. 4A.

5 is an enlarged plan view of a main part including the same thread cutting device.

6 is an enlarged bottom view of a main part including the same thread cutting device.

7 is an enlarged plan view of the same thread cutting device only.

The present invention relates to a sewing machine with a thread cutter applied to sewing of a cylindrical portion such as, for example, a neck circumference of a T-shirt, a suture of a cuff, and a covering. Specifically, it has a tubular bed suitable for sewing a cylindrical portion, and has a groove for a cloth feed tooth for perpendicularly passing in the cylindrical direction to the free end of the cylindrical bed to perform a needle passing hole and cloth feeding in the cylindrical axis. The needle plate is fixed, and a looper is provided below the needle plate, and at the side of the needle plate, a thread cutting device for pulling and cutting the needle thread and the looper thread positioned between the needle plate and the looper laterally after sewing is cut. The present invention relates to a multi-needle cylindrical type sewing machine provided.

The thread cutting device in the multiple needle cylindrical type sewing machine of this kind has a horizontal surface such that the distal end portion is bent into a hook shape and has a threading portion at the inner circumference of the curved end, and the threading portion traverses a plurality of needle passage holes of the needle plate. Fixed scalpel which cuts the movable scalpel oscillating inside and the needle thread and looper thread which are caught to the end thread hanging part at the time of the double swing of this movable scalpel and transferred to the needle passage hole side by shearing action between the movable scalpel. And a movable scalpel pressing plate for contacting the movable scalpel and guiding the swing of the movable scalpel elastically between the fixed scalpel and the thread capable of elastically supporting the cut thread end portion between the movable scalpel tip. It is provided with a fitting plate.

By the way, in the sewing machine with a thread cutting device which consists of the above components, as a movable blade drive mechanism which drives a movable blade reciprocatingly swinging, it is conventionally described in Utility Model Registration No. 3101486. A driver such as a bidirectional electromagnet (solenoid), an air cylinder, or the like is attached to the side outer surface of the sewing machine body which is integrally connected to the side, while the cylindrical bed is linearly reciprocated along the cylindrical axis direction (cloth feeding direction). A movable member is provided, and the base end of the movable member and the movable portion of the driver are interlocked with each other through a link provided by protruding to one side of the cylindrical bed portion, and at the same time, the front end of the movable member is interlocked with the movable scalpel. It is known.

In a conventional sewing machine with a thread cutting device having a movable blade drive mechanism having the above-described configuration, the driver and a part of the link operated in conjunction with the driver are exposed to the outside of the side of the sewing machine body or cover the exposed portion. Even if it does, the cover will protrude outside the side of the sewing machine body. Therefore, when the cylindrical portion, which is the product to be sealed, is inserted from the free end of the cylindrical bed to perform a predetermined sewing operation, an exposed portion or a projection including a part of the operation link touches or touches a long sewing fabric. It became difficult to handle the fabric, and as a result, the efficiency of sewing workability did not increase. Moreover, since there are many components for the interlocking linkage of a movable scalpel and a driver, when attaching a thread cutter to a sewing machine later, there existed a problem that great effort was required for their assembly.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and the number of components can be reduced to reduce costs, facilitate assembly and rationalization, and facilitate handling of fabric during sewing, thereby improving workability. An object of the present invention is to provide a sewing machine with a thread cutting device.

In order to achieve the above object, the sewing machine with a thread cutting device according to the present invention is disposed at the free end of the cylindrical bed at right angles to the cylindrical axis direction, and is disposed before and after the needle through hole and the needle through hole to convey the cloth in the cylindrical axis direction. The needle plate having the groove for the cloth transfer tooth for carrying out the operation is fixed, and a looper for reciprocating and swinging in the direction intersecting the cloth transfer direction is provided in the cylindrical bed below the needle plate, and the tip side is hooked. Between the needle plate and the needle plate so that the end thread hanging portion crosses the needle passage hole about the axis provided on the back side of the needle plate. A movable scalpel oscillating reciprocally in the horizontal plane of the Shear between the movable knife drive mechanism for oscillating recovery movement, and the needle thread and the looper thread caught by the distal end of the movable blade by the movable knife drive mechanism and conveyed to the side of the needle passage hole. A fixed scalpel cut by the action, a movable scalpel pressing plate which contacts the movable scalpel and elastically guides the swing of the movable scalpel between the fixed scalpel, and the cut thread end portion between the tip of the movable scalpel. In a sewing machine with a thread cutting device provided with a thread-fitting plate which can be elastically fitted, the movable scalpel drive mechanism has one end pivoted at an intermediate portion between the reciprocating oscillation central axis of the movable scalpel and the distal thread engaging portion. A drive connection link supported and connected with the other end extending in the cylindrical bed in a cloth conveying direction; Has the moving connecting rod is supported pivotally to the other end of the link being linearly reciprocated in the cloth feed direction, and is characterized in that it is composed of a fluid pressure cylinder mounted in the tubular fixed bed.

(Example)

1 is a schematic perspective view of an entire sewing machine of a three needle cylindrical type with a thread cutting device according to the present invention, FIG. 2 is an exploded perspective view of the components of the thread cutting device, and FIG. 4 (a) is an enlarged longitudinal sectional view at the line XX of FIG. 3, and FIG. 4 (b) is an enlarged view of the portion B of FIG. 4 (a). The three needle cylindrical type sewing machine (M) faces forward from the lower part of the sewing bed portion (the sewing body) 2, and the sewing spindle, the needle drive mechanism and the push drive mechanism (these are well known, The tubular bed 1 extends with the sewing machine arm 3 having a built-in body).

This cylindrical bed 1 is formed by dividing it into the lower bed part 1A which opens upwards as shown in FIG. 2, and the upper cover part 1B which covers the upper opening of this lower bed part 1A. A plate-shaped inner cover 30, which will be described later, is sandwiched between these lower bed portions 1A and the upper cover portion 1B to be secured. On the free end of the lower bed portion 1A of the cylindrical bed 1, the needle plate 5 is fixed through the needle plate spacer 31 and the screw 4, and at the same time, the lower portion of the needle plate 5 is fixed. As shown in Fig. 4, the looper 6 and the looper driving mechanism reciprocating in the bc direction intersecting (orthogonally) with the cloth conveying direction (sewing advancing direction) a (orthogonal) are known. The description thereof is omitted), and the bed part cover 7 surrounding the looper 6 and the looper driving mechanism is detachable from the distal end side at the free end of the cylindrical bed part 1. It is installed.

At the tip end of the sewing arm 3, a needle rod 8 reciprocating up and down and a push rod 9 capable of lifting up and down are supported downward in a protruding state, and a needle is provided at a lower end of the needle rod 8. The three needles 11 are attached in parallel in the direction orthogonal to the cloth conveying direction a through the fixing portion 10, and at the lower end of the pressing rod 9, the needle plate 5 is sealed. A depressor 12 for pressing is attached. In addition, the needle plate 5 has its left and right sides 5a and 5a formed in parallel with the cloth transfer direction a, and the needle plate 5 has a cylindrical axis direction of the cylindrical bed portion 2. Three needle through holes 13 are orthogonal to each other, and the cloth feed teeth for conveying cloth in the axial direction on the front, rear, left and right sides of these needle through holes 13 are omitted. Groove 14 for forming a mold, and a movable scalpel 15, a fixed scalpel 16, a movable scalpel holding plate 17, a thread fitting plate 27, and the like, which are described later on the back surface of the needle plate 5; Is equipped with a thread cutting device 18, the main component of which.

3 and 5 to 7 show a specific structure of the thread cutting device 18, and the movable scalpel 15 has a tip end side curved in a hook shape, and one looper thread LT around its curved tip end circumference. The hook-shaped loop hook thread 15a for hooking and the hook-shaped hook thread 15b for hooking three needle threads NT are formed separately, and the proximal end 15c of the movable scalpel 15 is formed. Is fixedly attached to the rear surface of the needle plate 5 through the screw shaft 19, and the two hook-shaped thread engaging portions 15a and 15b have three needle through holes (centered around the screw shaft 19). It is possible to reciprocate in the direction of arrow de in the horizontal plane between the reciprocating oscillation path of the looper 6 and the needle plate 5 so as to cross 13), and return to the retracted position indicated by the solid line of FIGS. At this time, the needle plate 5 protrudes outward from the one side 5a parallel to the cloth feeding direction a. The inner circumferential edge 15e which is located outside of the cloth feed tooth groove 14 of the needle plate 5 when oscillating to the advance position shown by the uneven outer circumferential edge 15d and the virtual line of FIGS. It is comprised in the substantially U shape which has.

In addition, when the fixed blade 16 in the thread cutting device 18 swings from the advanced position shown by the virtual line of FIGS. 5-7 to the retracted position shown by the solid line of FIG. In other words, when swinging from the arrow e toward the d direction, one looper thread LT and three needles are caught by the hook-shaped thread engaging portions 15a and 15b at their ends and fed to the side of the needle passage hole 13. The thread NT is cut by the shear action between the movable scalpel pressing plate 17 and the movable scalpel 15 pressed against the fixed scalpel 16 side, and the thread fitting plate 27 is movable scalpel 15. Is elastically pressurized to the lower surface of the blade) to guide the swing of the movable blade 15 elastically between the fixed blade 16 and the thread end after cutting with the tip of the movable blade 15. It is elastically sandwiched between.

The fixed blade 16 having the function described above has a blade edge 16a near the thread hooking portions 15a and 15b due to the elastic connecting point of the movable blade 15 along the reciprocating drive swing of the movable blade 15. While varying between the tip end and the portion near the proximal end 15c, the swing of the movable scalpel 15 is guided between the fixed scalpel 16 and the movable scalpel 17 over its entire reciprocating swing range. , The fabric is formed in a straight line shape inclined along the inclined direction gradually away from the groove 14 for the cloth feed tooth as the cloth is fed and moved by the cloth feed tooth in the cloth feed direction (a). The attachment plate part 16b parallel to the cloth conveyance direction a is formed integrally toward the front side of the cloth conveyance direction a from the blade edge 16a of a photographic linear shape, and the fixed blade is attached to this attachment plate part 16b. 16 through the screw member 28 It is fixed to the back surface of the neulpan 5.

In addition, the thread fitting plate 27 is fixed to the fixed blade 16 so as to guide the swing of the movable blade 15 with the fixed blade 16 over the entire reciprocating swing range of the movable blade 15. The long thread end fitting 27a in a straight line shape inclined along the inclined direction at a position slightly drawn in from the edge 16a of the blade) and at the same time, the cloth is conveyed from the inclined linear thread end fitting 27a. The attachment plate part 27b parallel to the cloth conveyance direction a is formed integrally toward the front side of the direction a, and the back surface of the fixed scalpel 16 is provided via the screw member 32 in this attachment plate part 27b. It is fixed at.

On the other hand, a cylinder attachment block 34 is fixed to the upper surface of the inner cover 30 corresponding to a position near the proximal end of the cylindrical bed 1 by welding or the like, and an air cylinder (fluid) is mounted on the attachment block 34. One example of the pressure cylinder) 20 is configured to be fixedly installable via a screw 33 screwed in from the lower surface side of the inner cover 30. At the distal end of the movable rod part 21 of the air cylinder 20, a drive connection is disposed on the inner cover 30 and extends in the cylindrical bed 1 toward the cloth conveying direction (sewing progress direction) a. The other end of the link 26 is pivotally supported and connected via the stopper collar 22, the nut 23, the attachment block 24 and the support shaft 25, and at the same time The distal end portion is freely fitted to the pin 29 protruding near the proximal end portion 15c of the movable scalpel 15.

The movable scalpel drive mechanism is constituted by the above-described air cylinder 20 with the movable rod part 21 and the drive link link 26. The movable scalpel drive mechanism includes the inner cover 30 in the cylindrical bed 1. It is attached to this inner cover 30 before loading, and this inner cover 30 is clamped between the lower bed part 1A and the upper cover part 1B of the said cylindrical bed 1, and is fixed by the cylindrical bed 1 It is assembled inside the tubular bed 1 without being exposed or protruding laterally from the side.

Next, the sewing and thread cutting action by the 3-needle cylindrical type sewing machine M provided with the thread cutting device 18 comprised as mentioned above is demonstrated.

The cylindrical part of the to-be-sealed product inserted into the cylindrical bed part 1 from the free end side is sent to the predetermined | prescribed cloth conveyance direction a via the cloth feed tooth, and sewing, for example, is performed. Then, at the time when the predetermined sewing is finished, the movable scalpel 15 of the thread cutting device 18 is guided between the fixed scalpel 16 and the movable scalpel holding plate 17 to be in a constant horizontal plane without shaking or the like. Smoothly and stably, the hook-shaped thread catching portions 15a and 15b at their ends are crossed by the three needle through holes 13 in the needle plate 5 and are represented by the imaginary line of FIGS. A forward drive swings to the advance position, and then a double drive swing swings from this advance position to the retracted position shown by the solid line of FIGS. At the time of this double driving, the three needle threads NT passing through the needle passage hole 13 in the vertical direction are caught by the thread catching portion 15b and one looper thread which is hooked on the looper 6. LT is caught by the thread hooking portion 15a and is transferred to one side of the needle passage hole 13 and the groove 14 for the feed tooth to be cut by a shearing action between the movable scalpel 15 and the fixed scalpel 16. In addition, the cut thread end is elastically sandwiched between the distal end portion of the movable scalpel 15 and the thread end fitting portion 27a of the thread fitting plate 27.

In the sewing machine (M) in which a predetermined sewing operation is performed on a cylindrical portion, such as the neck circumference of the T-shirt, the stitching of the cuffs, or the covering, by repeating the above-described thread cutting action and the action of fitting the thread end portion after cutting, A stopper collar (where the drive connecting link 26, the air cylinder 20 constituting the movable blade drive mechanism, and the movable rod portion 21 of the air cylinder 20 and the drive connecting link 26 interlocked with each other) 22), all of the associated components, such as the nut 23, the attachment block 24, the support shaft 25, are accommodated in the cylindrical bed 1, and it is a cylindrical bed like the conventional example disclosed by patent document 1 Since there is no exposed portion or protruding cover portion outside the side of the sewing bed portion 2 close to the base end of (1), a sufficiently wide space is secured to the base end side of the tubular bed 1. Therefore, when a predetermined sewing operation is carried out by sandwiching a tubular portion of a large length of sewing cloth from the free end of the cylindrical bed 1, the sewing worker easily rotates or moves the large length, such as sewing cloth easily. It is possible to handle, improve the sewing workability, and reduce the occurrence of sewing miss as much as possible.

In addition, as described above, since the number of components of the movable blade drive mechanism is very small, not only the configuration of the movable blade drive mechanism can be simplified, but also the cost can be reduced, and the thread cutting device is attached to the sewing machine (M). When attaching later, a wide space is provided for those components, specifically, the air cylinder 20, the drive link link 26, and the associated components between the two, on the inner cover 30 before being put into the cylindrical bed 1. The inner cover 30 of the tubular bed 1 is assembled first, and then the inner cover 30 is fitted to the pin 29 which protrudes near the proximal end 15c of the movable blade 15. By inserting and fixing between the lower bed portion 1A and the upper cover portion 1B, it is possible to cook the air cylinder 20 or the drive link 26 at a predetermined position in the cylindrical bed 1 as desired. Movable scalpel Facilitate assembly of the mechanism and operation can also be carried out rationally.

In addition, a hook-shaped needle thread hook portion 15b that hooks a hook-shaped looper thread hook portion 15a for hanging one looper thread LT and three needle threads NT on the inner circumference of the curved tip portion of the movable scalpel 15. Since the needle thread (NT) and the looper thread (LT) are respectively captured and cut separately with a time difference, since the needle thread (NT) and the looper thread (LT) are formed separately from each other, an excessive cutting load on the movable knife (15) and the fixed knife (16) It is possible to suppress the wear and tear of the edges of the blade edge as much as the excessive cutting load acts on the blade as much as possible, thereby eliminating the need for frequent scalpel replacement. Can be maintained well over a long period of time.

In addition, in the said embodiment, although what applied to the 3-needle cylindrical type sewing machine M was demonstrated in detail, you may apply to 2-needle cylindrical type, 4-needle cylindrical type, and 1 needle cylindrical type sewing machine.

Moreover, in the said embodiment, although it demonstrated as having provided the looper thread thread hook part 15a and the needle thread thread hook part 15b separately in the inner periphery of the curved tip part of the movable scalpel 15, the needle of one hook-shaped thread hook part is described. You may comprise so that a thread and a looper thread may hang.

According to the present invention having the above-described feature configuration, all of the drive connecting link, the movable rod portion, and the fluid pressure cylinder constituting the movable scalpel drive mechanism are housed in the tubular bed, so that the conventional example disclosed in Patent Document 1 In the same manner, no exposed portion or protrusion on the outside of the side of the sewing machine main body close to the base end of the tubular bed is eliminated, and a sufficiently wide space can be secured on the base end side of the tubular bed. Therefore, when a predetermined sewing operation is carried out by inserting a tubular portion of a long sewing cloth from the free end of the tubular bed, handling of the sewing cloth such as freely turning or moving the large length without any disturbance is performed. It is easy to improve sewing workability. In addition, as described above, the number of components of the movable scalpel drive mechanism is very small, and the configuration can be simplified to reduce the cost, and the sticking and assembly work of attaching the thread cutter to the sewing machine later can be avoided. We achieve effect to be able to reduce.

In particular, in a sewing machine with a thread cutting device according to the present invention, as described in claim 4, an upper cover which covers a lower bed portion of a cylindrical bed and an upper portion of the lower bed portion includes a fluid pressure cylinder constituting the movable scalpel drive mechanism. By employing a configuration in which the drive connection link is fixedly installed on the inner cover that is sandwiched and fixed between the sections, the fluid pressure cylinder and the drive connection link are individually placed in a narrow space called a cylindrical bed. No cumbersome and complicated assembly work, such as fastening or interlocking, are required, and the components are first attached to the inner cover before being put into the cylindrical bed under a large space, and then the inner cover is attached to the lower bed part. By inserting and fixing between the upper cover part, the hydraulic cylinder and the drive connection It is possible to assemble the link at a predetermined position in the cylindrical bed, so that the assembling work of the movable scalpel drive mechanism can be further facilitated and rationalized.

Moreover, in the sewing machine with a thread cutter according to the present invention, the thread hook portion of the inner circumference of the curved tip portion of the movable knife may be formed so as to hook both the needle thread and the looper thread to one thread hook portion. As described above, it is preferable that the thread hanging portion of the inner circumference of the curved tip of the movable blade is formed by dividing the needle hanging portion for hanging the needle thread into a thread hanging portion for hanging the looper thread. In this case, the needle thread and the looper thread are respectively captured and time-divided separately, so that the cutting edges (broken edges) or deformation of the blade edge due to excessive cutting load acting on the movable and fixed blades at the same time can be suppressed as much as possible. It does not require frequent scalpel replacement, and the thread cutting performance can be maintained well over a long period of time.

Claims (8)

At the free end of the cylindrical bed, a needle plate having a needle passage hole and a groove for the cloth transfer tooth, which is arranged before and after the needle passage hole and performs cloth transfer in the cylinder axis direction, is fixed. In the lower cylindrical bed, a looper for reciprocating and oscillating motion is installed in a direction intersecting with the cloth conveyance direction, the tip end side is curved in a hook shape, and has a thread engaging portion in the curved tip inner periphery. A movable scalpel capable of oscillating reciprocally in a horizontal plane between the reciprocating oscillation path of the looper and the needle plate such that the tip thread engaging portion crosses the needle passage hole about the axis provided on the rear surface side; The movable mes drive mechanism for oscillating the reciprocating drive around the axis on the back side of the plate, and the movable mes drive mechanism A fixed scalpel which cuts the needle thread and the looper thread which are caught by the distal end of the movable mesmer to the side of the needle passage hole at the time of the double swing of the movable scalpel by shearing action between the movable scalpel, and the movable scalpel Thread cutting device is provided with a movable scalpel pressing plate for elastically inserting the swing of the scalpel between the fixed scalpel and a thread fitting plate for elastically supporting the cut thread end with the distal end of the movable scalpel. In the attachment sewing machine, The movable scalpel drive mechanism is connected to the intermediate portion between the reciprocating oscillation central axis of the movable scalpel and the distal end portion of the movable scalpel by pivotal support, and the other end of which extends into the cylindrical bed in the direction of the cloth feed. Sewing machine with a thread cutting device, comprising: a hydraulic rod pivotally supported at the other end of the drive linking link, and having a movable rod part linearly reciprocating in the cloth conveying direction, and fixed in the cylindrical bed. . The method of claim 1, wherein the fixed blade is formed in a linear shape inclined along the inclined direction gradually away from the groove for the cloth feed teeth as the edge of the blade is moved by the cloth transfer teeth in the cloth transfer direction Sewing machine with a thread cutter, characterized in that. The needle of claim 1, wherein when the movable scalpel is oscillated to the advance position where the outer circumferential edge and the distal end portion of the needle thread that do not protrude outward from one side parallel to the cloth conveyance direction of the needle plate cross the needle passage hole, the needle A sewing machine with a thread cutting device, characterized in that it is formed in a U-shape having an inner circumferential edge located outside the groove for tooth feed teeth of the plate. The fluid pressure cylinder constituting the movable scalpel drive mechanism is fixedly installed on an inner cover which is sandwiched and fixed between a lower bed portion of a cylindrical bed and an upper cover portion covering an upper portion of the lower bed portion. A sewing machine with a thread cutting device, characterized in that the drive link is arranged on the inner cover. The sewing machine with a thread cutting device according to claim 1, wherein the thread hooking portion of the movable tip inner periphery of the movable scalpel is divided into a needle threading portion for hanging a needle thread and a threading portion for a looper thread for hanging a looper thread. The sewing machine with a thread cutting device according to claim 3, wherein the thread hooking portion of the inner circumference of the curved tip portion of the movable scalpel is divided into a needle threading hook portion for hanging a needle thread and a looper thread hooking portion for hanging a looper thread. The sewing machine with a thread cutting device according to claim 1, wherein a hook-shaped thread hook portion for hooking a needle thread and a looper thread is formed on an inner circumference of the curved tip portion of the movable scalpel. The sewing machine with a thread cutting device according to claim 3, wherein a hook-shaped thread hook portion for hooking a needle thread and a looper thread is formed on the inner circumference of the curved tip of the movable scalpel.

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