JP2000080555A - Thread-cutting device of embroidery machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thread-cutting device of an embroidery machine capable of improving productivity of embroidery cloths in addition to reduction of a used amount of embroidery threads by reducing extending threads of the cloth after embroidery. SOLUTION: In an embroidery machine 1, a right side thread-cutting device 17 and an under side thread-cutting device 21 are installed to the right side and the under side of a cloth 5 spun on a cloth frame, respectively. The right side thread-cutting device 17 is constituted by installing a right side thread- holding unit 15 for holding the right side thread 2 after a stop stitch of the embroidery and a right side thread-cutter 16 for cutting the held right side thread to a cloth pressing body 14. The under side thread-cutting device 21 is constituted by installing an under side thread-holding unit 19 for holding the under side thread after a stop stitch of the embroidery and an under side thread-cutter 20 for cutting the held under side thread to the lower end of a shuttle guide 1 for guiding a shuttle. The right side thread 2 and the under side thread after the stop stitches are cut by the right side thread-cutting device 17 and the under side thread-cutting device 21, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an embroidery machine, and more particularly, to an embroidery machine for cutting a front thread and a back thread from a portion which has been sewn during embroidery to reduce the number of crossover threads of the embroidered fabric. The present invention relates to a thread cutting device.

[0002]

2. Description of the Related Art Generally, as shown in FIG.
A large number of jumping yarns 102 connecting the patterns are formed, and a jump is made such that one stitch is attached to a portion other than the embroidery pattern of the fabric 100 in order to fix the jumping yarn 102 on the fabric 100. The jumping thread 102 is used for the embroidery 10
A thread that passes over the fabric 100 without sewing between the patterns 1 and includes a front thread 102a existing on the front side of the fabric 100 and a back thread (not shown) existing on the back side. And the fabric 100 after embroidery
It is necessary to remove the jumping yarn 102 before making the product into a product. Conventionally, to remove the jumping yarn 102, the following two steps of pre-shearing and shearing are performed.

[0003] First, as shown in the overall view of Fig. 11 and the plan view of the main part of Fig. 12, a plurality of thread cutting scissors 103, a plurality of rollers 104, a conveyor 105, etc., which open and close continuously are provided. The dough 100 (the transport direction is indicated by an arrow) on the pre-shearing machine 110
Most of the jumping yarn 102 of the fabric 100 is cut by the thread cutting scissors 103. 11 and 12, the thread cutting scissors 103 are 2
Although only one is shown, in practice, 16 to 22 pieces are usually arranged in a horizontal row according to the embroidery pattern. As described above, since the jumping yarn 102 exists on the front side and the back side of the fabric 100, after cutting the front side jumping yarn 102a,
With the dough 100 turned upside down, the pre-shearing machine 110
To cut the crossover yarn on the back side.

Next, as shown in FIG. 13, a shearing cylinder 106 and a shearing table 107a
After passing through the shearing machine 111 equipped with the like, the pre-sheared dough 100 (refer to the arrow for the transport direction), first, almost all of the transfer yarns of the dough 100 are cut by a cutting roller (not shown). The shearing cylinder 106 having a large number of shearing knives 106a is used to cut the crossover yarn 102 after cutting. In this way, before the embroidered cloth 100 is applied to the pre-shearing machine 110 (see FIG. 11) before being applied to the shearing machine 111, the shearing machine 111
And the load on the dough 100 is reduced. That is, since a large number of jumping yarns 102 are present in the cloth 100 immediately after embroidery, if the cloth 100 is suddenly applied to the shearing machine 111, the load on the cloth 100 is large, and
For this reason, most of the crossover yarn 102 is cut in advance by applying the cloth 100 to a pre-shearing machine 110 (see FIG. 11). As described above, since the jumping yarn 102 exists on the front side and the back side of the cloth 100, the cloth 1 is cut after cutting the crossing yarn 102a on the front side.
By passing 00 through the shirring machine 111 in the opposite direction, the crossover yarn on the back side is cut.

[0005]

As described above, conventionally,
In the embroidered fabric, there are many jumping yarns that connect the patterns of the embroidery, and these jumping yarns are removed and discarded in a later process. There is a problem of bulkiness. In addition, it is necessary to perform pre-shearing, and it is necessary to perform shearing many times. As a result, the equipment cost by the pre-shearing machine is increased, and the productivity of embroidery cloth is significantly reduced. Also occurs. The number of times of shearing is usually 4 on each of the front side and the back side of the embroidery cloth.
And about three times.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has an embroidery machine capable of reducing the amount of embroidery thread used and equipment cost and increasing the productivity of embroidery cloth. It is an object of the present invention to provide a thread cutting device.

[0007]

In order to achieve the above object, the present invention provides a thread cutting device for an embroidery machine, which comprises a needle as a swinging hook containing a needle threaded through a needle thread and a back thread. And a fabric frame for attaching the fabric to be embroidered in a stretched state, and while moving the fabric frame in the up, down, left, and right directions, by cooperation of the needle and the shuttle, a plurality of fabric frames are formed in one design. An embroidery machine configured to form embroidery on the cloth using embroidery threads of a color comprises a front thread cutting device and a back thread cutting device provided on the front side and the back side of the cloth at positions substantially opposite to each other. The face thread cutting device includes a face thread holding member for holding a face thread after embroidery stop sewing on a fabric holding body for holding the fabric,
A back thread cutter for cutting the held front thread is provided, and the back thread cutting device is configured to attach a back thread after embroidery stop sewing to a shuttle guide for guiding the shuttle. A backing yarn holding member for holding, and a backing yarn cutter for cutting the held backing yarn are provided and configured, and with the movement of the fabric frame and the needle, the front yarn cutting device The holding, cutting, and release of the holding of the front yarn are sequentially performed, and the holding, cutting, and release of the holding of the back yarn are sequentially performed by the back yarn cutting device. Things.

Therefore, in the present invention, the front thread and the back thread are cut from the sewn portion during the embroidery by the front thread cutting device and the back thread cutting device, respectively. It can be less than in the prior art.

[0009] According to a second aspect of the present invention, the front thread holding member is configured to hold the front thread between windings of a coil spring, and the back thread holding member is provided with a thread gripping plate. Since the back yarn is configured to be sandwiched between the shuttle guide and the shuttle guide, the apparatus cost does not increase.

Further, according to a third aspect of the present invention, the front yarn cutting device and the back yarn cutting device are arranged in plurality in accordance with the type of the colors of the front yarn and the back yarn.
Since the front thread and the back thread can be cut from the sewn portion of each color embroidery thread, the number of crossover threads for each color embroidery thread can be reduced, thereby reducing waste.

[0011]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing one embodiment of an embroidery machine according to the present invention, and FIG. 2 is a perspective view of one embodiment of the table thread cutting device of the present invention arranged on the front side of the fabric in the embroidery machine shown in FIG. FIGS. 3 (a) and 3 (b) are a front view and a side view, respectively, of the face thread cutting device shown in FIG. 2, and FIG. 4 is the embroidery machine shown in FIG. 5 (a) and 5 (b) are a front view and a side view of the backside thread cutting device shown in FIG. 4, respectively.

First, an outline of an embroidery machine (lace machine) will be described. As shown in FIG. 1, the embroidery machine 1
In order to attach a needle 3 having a front thread 2 (also referred to as an upper thread) passed through a, a shuttle 4 as a swinging pot for a back thread (also referred to as a lower thread), and a cloth 5 to be embroidered, Cloth frame (not shown), and moves the cloth frame upward (in the direction of arrow Y) and laterally (in the direction orthogonal to the plane of FIG. 1 and in the direction of arrow X in FIG. 2) based on the embroidery data. The embroidery S (for example, see FIG. 2) is formed on the cloth 5 by the cooperation of the needle 3 and the shuttle 4. The front thread 2 and the back thread constitute an embroidery thread. A plurality of needles 3 are arranged in the length direction of the fabric 5 (a direction orthogonal to the paper surface of FIG. 1 and an arrow X direction in FIG. 2), and embroidery of a plurality of colors (six colors in this example) in one design. In order to form an embroidery S on the cloth 5 using a thread, a plurality of needles 3
A needle switching device (not shown) for switching the driving of the needle.

Reference numeral 6 denotes a bobbin of the front yarn 2, reference numeral 7 denotes a brake mechanism for preventing the slack of the front yarn 2,
Reference numeral 8 denotes a yarn monitoring monitor for detecting yarn breakage of the upper yarn 2, reference numerals 9a and 9b denote yarn tension devices of the front yarn 2,
Reference numeral 10 indicates a borer, reference numerals 11a and 11b indicate upper and lower drive pins (driving members) for reciprocating (swinging) the shuttle 4 in the vertical direction, and reference numeral 12 indicates reciprocation of the shuttle 4. A shuttle guide (also referred to as a shuttle box) for guiding the movement is shown, reference numerals 13a and 13b indicate a front yarn guide member, and a reference numeral 14 indicates a cloth presser (presser) for pressing the cloth 5. The bowler 10 is an embroidery machine 1
A substantially quadrangular pyramid member provided below the needle 3 of
Used for drilling, one of the embroidery techniques. That is,
This is a technique in which the material 5 is pierced by the bowler 10 to make a hole (break), and the surrounding area is sewn with embroidery thread.

As shown in FIGS. 1 and 2, a coil spring 15 (a member for holding a surface thread) and a surface thread cutter 16 to be described later are attached to the material presser 14 (presser) arranged on the front side of the material 5. Face thread cutting device 1
7 are configured. The cloth presser 14 is the first support 1
8 (see FIG. 2), a plurality of fabrics 5 are provided in the length direction (arrow X direction). The first support 18 is provided with a plurality of the needles 3, the borer 10, and the like. On the other hand, as shown in FIGS. 1 and 4, the lower end 37 of the shuttle guide 12 disposed on the
A backing thread cutter 21 (a backing yarn holding member) and a backing yarn cutter 20 and the like, which will be described later, are attached to constitute a backing yarn cutting device 21. In addition, a plurality of back yarn cutting devices 21 are provided on the second support 22 (see FIG. 4) in the length direction of the cloth 5. As described above, the face thread cutting device 1 according to the present invention
7 and the backside thread cutting device 21 are disposed so as to be substantially opposed to each other across the cloth 5, and details thereof will be described later.

Here, with reference to FIG. 6, a process of embroidering the cloth 5 by the embroidery machine 1 will be described. First, as shown in FIG. 6A, when the shuttle 4 is at the lowest position, the needle 3 is moved to the hole 2 of the shuttle guide 12.
3 through. As shown in FIG. 6B, the needle 3 starts to retreat, a loop 24 is formed in the front yarn 2, and the shuttle 4 starts to ascend. As shown in FIG.
When the shuttle 4 has passed through the loop 24 of the front yarn 2, and further, as shown in FIG. 6D, has reached the highest position and has passed through the loop 24, the front yarn 2 and the back yarn 25 have been moved.
Thus, a stitch 26 corresponding to one stitch is formed on the cloth 5, and thereafter, the state returns to the state shown in FIG. The above-described operation is repeated, and the embroidery S (for example, see FIG. 2) is formed on the cloth 5.

Next, one embodiment of the front thread cutting device 17 and the back thread cutting device 21 of the present invention will be described sequentially. First, as for the face thread cutting device 17, as shown in FIGS.
Almost the upper half of the (base) is divided into a plurality of (in this example, six, but only four in FIG. 3A) holding portions 28, and each holding portion 28 The front surface 29 of the portion 28 contacts and presses the fabric 5. In addition, each holding part 28
Is coated with a resin to reduce friction with the cloth 5 and to prevent the cloth 5 from being caught. Each presser part 2
A coil spring 15 as a front yarn holding member is arranged on the back surface 30 side of 8 in a state of being turned sideways.

At one end of the coil spring 15, a screw member 31 as a holder is inserted and fixed, and the screw member 31 is cut by a flexible first coupling member 32 (insulation tie). The first connecting member 32 is held, and is fixed to the holding portion 28 by a plurality of flexible second connecting members 33 (insulation ties). With the movement of the cloth frame (not shown) on which the cloth 5 is stretched, a front thread (not shown) is provided between the windings 34 of the coil spring 15.
, The front yarn can be held between the windings 34 and held. In FIG. 3A, the coil springs of the holding portions 28 on both sides are not shown. The structure for fixing the coil spring 15 to the holding portion 28 is not limited to the above structure. For example, a screw member 31 (holder) for holding the coil spring 15 may be fixed to the holding portion 28 with an adhesive or the like. Further, the coil spring 15 may be directly fixed to the holding portion 28 without providing the screw member 31. In FIG. 3, reference numerals 3 and 10 indicate a needle and a borer.

On the front side of each holding portion 28 of the fabric holding body 14, the face thread cutter 16 is fixed in a horizontal state with its blade portion 35 obliquely upward. The length of the face thread cutter 16 is slightly longer than the width of the cloth presser 14. Although the front thread cutter 16 is fixed to the cloth holding body 14 by bolts and nuts 36, other fixing forms may be adopted. Since the embroidery machine 1 of the present embodiment forms embroidery using, for example, embroidery threads of six colors, the fabric presser 14 includes six presser portions 28 corresponding to the embroidery threads of six colors. The holding portion 28 is provided with a coil spring 15 as a surface thread holding member. This dough presser 14
As shown in FIG. 2, a plurality of are arranged in the length direction of the fabric 5 (the direction of the arrow X).

Next, the back yarn cutting device 21 will be described with reference to FIG.
As shown in FIG. 5, the lower end 37 of the shuttle guide 12 for guiding the swing of the shuttle 4 has
The thread holding plate 19 and the back thread cutter 20 as the holding members are fixed by appropriate fixing means, and the blade portion 20a of the back thread cutter 20 faces downward. In the back yarn cutting device 21, the back yarn 25 is scooped by the yarn holding plate 19 with the movement of the fabric frame (not shown), and the scooped back yarn 25 is cut by the blade portion 20 a of the back yarn cutter 20. . As shown in FIG. 4, a plurality of backside thread cutting devices 21 are provided in the length direction of the fabric 5 (the direction of the arrow X).
In FIG. 5, reference numeral 23 denotes a hole formed in the shuttle guide 12 and into which the needle 3 enters during embroidery.

Next, the operation of the front thread cutting device 17 and the back thread cutting device 21 will be described with reference to FIGS. After the stop stitching process at the end of embroidery sewing, the cutting of the front thread 2 by the front thread cutting device 17 and the cutting of the back thread 25 by the back thread cutting device 21 are sequentially performed almost simultaneously as described later. Note that, in FIG.
Indicates the vicinity of the fixed stitch portion (sewing end point) of the fabric 5 stretched on the fabric frame (not shown).

First, FIGS. 7 (a) and 8 (a) show a state after the stop sewing step at the end of embroidery sewing. As shown in FIG. 7B, the fabric frame (not shown) on which the fabric 5 is stretched is lowered, for example, by about 3 cm (see arrow X1), and the face yarn 2 is wound around the winding wire 34 of the coil spring 15 (see FIG. 3). Allow to enter and hold. Here, FIG.
As shown in (c), when the fabric frame (not shown) is further lowered, for example, by about 5 cm (see arrow X2), the front yarn 2 touches the cutting edge 35 of the front yarn cutter 16 and is cut.

Next, as shown in FIG. 8 (b), after lowering the cloth frame (not shown) by, for example, about 10.5 cm, and moving it to the left, for example, by about 3 cm (see arrow X3), the backing yarn The thread 25 is scooped by the inclined peripheral surface 19 a of the thread catching tray 19 (see FIG. 5), and the backing thread 25 is held between the thread catching tray 19 and the lower end 37 of the shuttle guide 12. Here, as shown in FIG. 8C, when the fabric frame (not shown) is raised, the back yarn 25 is
The blade is cut by touching the zero blade edge 20a (blade portion).

Finally, as shown in FIGS. 7 (d) and 8 (d), the fabric frame (not shown) is moved (the moving direction depends on the embroidery design), and the needle 3 is moved again. When the sewing is started, the end of the front thread 2 is released from between the windings 34 of the coil spring 15 to release the holding, and the end of the back thread 25 is moved to the thread holding plate 19 and the lower end 37 of the shuttle guide 12. And the holding is released. In this manner, the ends of the front thread 2 and the back thread 25 are retained even after being cut, and when the sewing is started again, the retention is released.

As described above, in the present embodiment, the front thread 2 and the back thread 25 are sewn from the sewn portion during embroidery.
Since cutting is performed by the front thread cutting device 17 and the back thread cutting device 21, respectively, the number of needle holes caused by jumping threads and jumps of the embroidery cloth 5 can be reduced as compared with the related art. Therefore, the conventional pre-shearing step can be omitted, and the crossover yarn can be almost completely removed by passing the embroidered cloth through a shearing machine described later about three times on the front side and once on the back side. .

Next, the shearing of the embroidery cloth 5 by the shearing machine 40 will be described with reference to FIG.
As shown in FIG. 9, first, the embroidery cloth 5 is set on the shearing machine 40, and the carry-in roller 42 on the entrance side of the shearing machine 40 is attached to the embroidery cloth 5 conveyed by the carry-out roller 41 on the exit side of the shearing machine 40. To apply tension to the fabric 5 to prevent it from loosening. The needle detector 43 checks whether broken needles or the like remain in the embroidery of the fabric 5. The crossing yarn of the cloth 5 is cut by a cutting roller 44 having a number of blades 44a.

The edge 46a of the shearing table 46
Above, the transfer yarn of the cloth 5 is sucked by the suction blower 45, and the transfer yarn stands on the edge 46a. Edge 46a
A number of shirring knives 47a
Is cut by a rotating shearing cylinder 47 having At this time, the length of the crossover yarn after shearing is determined by the gap between the shearing knife 47a and the shearing table 46. And dough 5 after shirring
Is folded by a folding machine 48 behind the take-out roller 41. In addition, the effective shearing width of the shearing machine 40 is about 2 m40 cm at the maximum width,
The minimum and maximum speeds of 0 are each about 12 m / mi
n and 36 m / min. With the above operation, the embroidered cloth 5 is stripped of excess crossover yarn in the shearing machine 40.

As described above, the number of crossover threads of the embroidery cloth 5 can be reduced as compared with the prior art. Therefore, the number of times of passing the cloth 5 through the shearing machine 40 is 3 on the front side and the back side of the embroidery cloth 5 respectively. Only once and once, the productivity of the embroidery cloth 5 is improved as a result.

[0028]

Since the present invention is configured as described above, it has various effects as described below. According to the first aspect of the present invention, the front thread and the back thread are cut by the front thread cutting device and the back thread cutting device from the sewn portion during the embroidery, respectively. Less. Therefore, the amount of embroidery thread used can be reduced, and the cost is reduced. Since a pre-shearing machine is not required, equipment costs are also reduced. The number of times the embroidered fabric is passed through the shearing machine can be reduced, the time required for shearing can be reduced, and the productivity of the embroidered fabric can be improved. Since the number of jumps is reduced, the time for embroidering one pattern can be reduced, and the time for creating embroidery data is also reduced. Since the number of needle holes due to jump is reduced, a step of erasing the needle holes remaining in the fabric can be omitted depending on the embroidery design. Since it is a simple device, a costly control system is not required.

According to a second aspect of the present invention, the front yarn holding member is configured to hold the front yarn between windings of a coil spring, and the back yarn holding member is configured to By employing a configuration in which the back yarn is held between the shuttle guide and the shuttle guide, it is possible to further reduce the apparatus cost.

Further, as in the invention according to claim 3, the front yarn cutting device and the back yarn cutting device are arranged in plural in accordance with the types of colors of the front yarn and the back yarn. Since the front thread and the back thread can be cut from the sewn portion of each color embroidery thread, the number of crossover threads for each color embroidery thread can be reduced, thereby reducing waste.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of an embroidery machine according to the present invention.

FIG. 2 is a perspective view of one embodiment of a face thread cutting device of the present invention arranged on the front side of the fabric in the embroidery machine shown in FIG. 1;

FIGS. 3A and 3B are a front view and a side view, respectively, of the face thread cutting device shown in FIG. 2;

FIG. 4 is a perspective view of one embodiment of the back thread cutting device of the present invention arranged on the back side of the fabric in the embroidery machine shown in FIG. 1;

5 (a) and 5 (b) are a front view and a side view of the backside thread cutting device shown in FIG. 4, respectively.

FIG. 6 is a diagram for explaining operations of a needle and a shuttle during embroidery.

FIG. 7 is a view showing a process when cutting the front yarn by the front yarn cutting device shown in FIGS. 2 and 3;

FIG. 8 is a view showing a step of cutting the back yarn by the back yarn cutting device shown in FIGS. 4 and 5;

FIG. 9 is a schematic view showing the entire configuration of a shearing machine.

FIG. 10 is a plan view showing a fabric immediately after embroidery in the related art.

FIG. 11 is a schematic configuration diagram of a pre-shearing machine used in a conventional technique.

FIG. 12 is an enlarged plan view of a cut portion of the pre-shearing machine shown in FIG.

FIG. 13 is a view showing a shearing cylinder of the shearing machine.

[Explanation of symbols]

 S Embroidery 1 Embroidery machine (lace machine) 2 Table thread (upper thread) 3 Needle 3a Needle hole 4 Shuttle (rocking pot) 5 Fabric 6 Bobbin 10 Borer 12 Shuttle guide (shuttle box) 14 Fabric presser (Presser) 15 Coil Spring (member for holding the front thread) 16 Front thread cutter 17 Front thread cutting device 19 Thread catching plate (member for holding the back thread) 20 Back thread cutter 21 Back thread cutting device 25 Back thread (bottom thread) 27 Main body of the fabric presser Part 28 Holding part 32, 33 Coupling member (insulation tie) 34 Winding 40 Shearing machine 47 Shearing cylinder 47a Shearing knife

Claims (3)

[Claims] 1. A sewing machine comprising: a needle having a front thread passed through a needle hole; a shuttle serving as a swinging pot containing a back thread; and a fabric frame for attaching the fabric to be embroidered in a stretched state. An embroidery machine configured to form embroidery on the fabric using embroidery threads of a plurality of colors in one design by cooperation of the needle and the shuttle while moving the fabric frame in the vertical and horizontal directions. A front thread cutting device and a back thread cutting device provided at positions substantially opposite to each other on the front and back sides of the fabric, the front thread cutting device includes a fabric presser body for holding the fabric; A front thread holding member for holding the front thread after the stop sewing is provided, and a front thread cutter for cutting the held front thread is provided. To guide the shuttle
A backing thread holding member for holding the backing thread after the embroidery is sewn, and a backing thread cutter for cutting the held backing thread are provided, and are configured to move the fabric frame and the needle. Accordingly, the holding, cutting, and release of the holding of the front yarn are sequentially performed by the front yarn cutting device, and the holding, cutting, and release of the holding of the back yarn are sequentially performed by the back yarn cutting device. A thread cutting device for an embroidery machine. 2. The front yarn holding member is configured to hold the front yarn between windings of a coil spring, and the back yarn holding member is provided between a yarn holding plate and the shuttle guide. The thread cutting device of an embroidery machine according to claim 1, wherein the thread cutting device is configured to hold the back thread. 3. The embroidery machine according to claim 1, wherein a plurality of the face thread cutting devices and the back thread cutting devices are arranged in parallel in accordance with types of colors of the front thread and the back thread. Thread cutting device.