JP5084296B2 - Sewing sewing machine - Google Patents

Description

  The present invention relates to a sewing machine that performs bead stitching.

  The rim stitching is, for example, a lot of sewing performed on the opening of a pocket of a suit, and two parallel seams and two parallel seams in a state in which the garment is stacked on the body cloth. A straight cut formed between the stitches of the book is formed, and V-shaped corner cuts are formed at both ends in the sewing direction. In a general ball edge sewing, a rectangular opening is formed by aligning the sewing start position and end position of two seams in the sewing direction. When such a rectangular opening is formed, a corner cut is formed by arranging two corner knives with sharp tips in a V shape and simultaneously penetrating them into the body cloth.

A corner knife mechanism mounted on the sewing machine is used to form the corner cut. Such a corner knife mechanism is arranged on the lower side of the sewing table that performs the sewing operation, and the corner knife is formed by pushing up the corner knife upward from the opening provided on the conveying path of the sewing object of the sewing table. I was going. Such a corner knife mechanism is normally hidden under the sewing machine table, so that it can be slid in a direction perpendicular to the conveying direction of the sewing product so that maintenance work can be performed. It can be pulled out from the end edge portion of the (see, for example, Patent Document 1).
JP 2007-29641 A

By the way, in order to make it easy to perform maintenance work such as knife replacement for all corner knife when trying to mount a plurality of corner knife in the corner knife mechanism in a direction perpendicular to the conveyance direction of the sewing product. It is desirable that all the plurality of corner knives arranged side by side can be pulled out from the edge of the sewing machine table.
However, when the corner knife device is supported by a rail or the like so that it can be pulled out from the edge of the sewing machine table, one end of the support structure such as the rail is positioned inside the edge of the sewing machine table. Although it can be supported by a table, the other end side is outside the table and cannot be supported. During the maintenance of the corner knife mechanism, there is work to apply force to the corner knife mechanism in the vertical direction, such as screw tightening. There was a limit to how much the mechanism could be pulled out. As a result, it may be difficult to pull out all the plurality of corner knives arranged outside the edge of the sewing machine table.

  An object of the present invention is to improve workability in maintenance and the like.

According to the first aspect of the present invention, there is provided a corner having a plurality of corner knives which are arranged below the sewing machine table and which are raised from an opening provided in the sewing machine table by driving of the raising driving means to form a corner cut in the sewing product. The sewing machine has a knife mechanism and a rail guide provided along a direction orthogonal to the cloth feed direction, and the corner knife mechanism is configured to execute the formation of a corner cut for the workpiece through the rail guide. A corner knife support mechanism that supports a movable position along a direction orthogonal to the cloth feed direction at an operating position below the table and a maintenance position that is outside the edge of the sewing machine table; raising the female, said a control means for forming a corner cut to the workpiece, the corner knife mechanisms, the Reruga A main body portion that is movably supported along a direction orthogonal to the cloth feeding direction through the de, the body portion with a plurality of corner knives is erected which is arranged in the direction orthogonal to the cloth feeding direction On the other hand, a knife base that is supported so as to be movable in a direction orthogonal to the cloth feeding direction, and any one of the plurality of corner knives is set to a position where a raising driving force is selectively applied by the raising driving means. An index motor as a selection driving means for moving the knife base in a direction perpendicular to the cloth feeding direction with respect to the main body , and the control means controls the index motor to make a corner break. after forming the, the female base is moved to the most closer the leftmost position in the maintenance position side from the position at the time of formation of the corner cut, controlled to maintain the state until the next sewing start And wherein the Rukoto.

According to the first aspect of the present invention, if the corner knife mechanism is located at the maintenance position at least from the completion of sewing of one sewing product to the start of sewing of the next sewing product, the entire edge of the sewing machine table is completely removed. The knife base is moved toward the outer side of the edge of the sewing table up to the position where the corner knife is on the outer side of the edge of the sewing machine table.
Here, “If the corner knife mechanism is located at the maintenance position, the position where all the corner knife is outside the edge of the sewing machine table from the edge of the sewing machine table” means the position of the knife base in the corner knife mechanism. It should be noted that the corner knife mechanism itself need not be in the maintenance position. In other words, in a state where the corner knife mechanism is located at the maintenance position, since all the corner knives are located outside the edge of the sewing machine table from the edge of the sewing machine table, at least a certain amount outward from the basic position of the knife base at the operating position. If the corner knife mechanism is in the operating position or the maintenance position when the ascending drive means is not operated, the control means is at least the distance m. Operation control is performed to move the knife base to the outside.

As a result, when the corner knife mechanism is moved to the maintenance position during non-sewing due to maintenance, etc., since the knife base is located outside, all corner knife will be outside the sewing machine table, ensuring high workability. Is possible.
In particular, maintenance of the corner knife mechanism is performed with the main power supply of the edge stitch sewing machine turned off, so if the knife base is always moved outwards during non-sewing, the corner cuts are not formed. Even when the power supply of the edge stitch sewing machine is turned off, it is possible to quickly perform operations such as changing the knife.
Furthermore, it becomes possible to set the maintenance position of the corner knife mechanism to the inside of the table by the distance that the knife base moves to the outside, even if the corner knife mechanism adopts a cantilever support structure, It is possible to improve the strength against the load.

Note that the period during which the knife base is moved outward as at least “between the completion of sewing of one sewing product and the start of sewing of the next sewing product” is “completion of sewing of one sewing product” It goes without saying that it may be set longer than “from the start of sewing to the next sewing product”. This is because it is desirable that the knife base always moves outward when the corner knife mechanism is moved to the maintenance position.
For example, even during sewing, when the knife base needs to be positioned and maintained in the direction orthogonal to the cloth feed direction by the selection driving means (when the corner knife is selected or perpendicular to the cloth feed direction) Any timing except when adjusting the push-up position of the corner knife in the direction to be performed) may be the target of the period in which the knife base is moved outward.

(Explanation regarding the bead stitching performed by the bead stitching machine)
Hereinafter, a bead stitch sewing machine 10 according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing an overall schematic configuration of a bead stitch sewing machine 10. In the present embodiment, the respective directions are determined with reference to the XYZ axes shown in the drawings, and the Z-axis direction coincides with the vertical movement direction of the center knife, which will be described later, and is a plane for performing the sewing work. Is perpendicular to the Z-axis direction and is parallel to the work plane and the direction in which the cloth is fed is the X-axis direction, and the direction parallel to the work plane and perpendicular to the X-axis direction is the Y-axis direction.

  FIG. 2 shows the relationship between the linear cut S by the center knife and the cuts VFL, VFR, VRL, VRR by the center knife and the stitches TL, TR by the two needles in the edge stitch forming the oblique pocket opening. It is explanatory drawing shown. As shown in the figure, the direction of travel in the cloth feeding direction is the front side of the cloth feeding direction, the opposite direction is the rear side of the cloth feeding direction, and one direction along the Y-axis direction is the left hand side facing the cloth feeding direction. The following description will be made with the right side as the left side, the other direction along the Y-axis direction and facing the cloth feeding direction and becoming the right hand.

The bead stitch sewing machine 10 sews a cloth B to a body cloth M by two parallel seams T formed by two needles 41 and 41 and pockets along the feed direction F of these cloths. This is a sewing machine that forms a straight cut S that becomes a hole and a substantially V-shaped cut formed by a pair of corner cuts at both ends of the cut S.
In the edge stitch forming the oblique pocket opening, either one of the straight seams (the right side seam TR in FIG. 2) is formed to the rear side in the cloth feeding direction. Here, the amount of deviation in the cloth feeding direction from the rear end of the straight seam TR to the rear end of the straight seam TL is referred to as rear deviation CR, and the front side of the straight seam TL from the front end of the straight seam TR. The amount of deviation in the cloth feed direction to the end is assumed to be the front side deviation CF.

  A corner cut VFR is formed from the front end of the straight cut S to the front end of the right straight stitch TR, and the front end of the left straight stitch TL from a position somewhat behind the front end of the straight cut S. A corner break VFL is formed over the portion. Furthermore, a corner cut VRR is formed from a position slightly ahead of the rear end of the straight cut S to the rear end of the right straight stitch TR, and the left straight stitch TL from the rear end of the straight cut S. A corner break VRL is formed over the rear end portion.

  In addition, this edge stitch sewing machine 10 performs the stitch which does not provide deviation in any of the front end portion and the rear end portion, that is, the bead stitch where the two straight stitches form a rectangular opening with no deviation in the front and rear. It goes without saying that it is also possible to do this.

(Overall configuration of the stitching machine)
The ball edge sewing machine 10 includes a sewing machine table 11 serving as a sewing work table, a sewing machine frame 12 disposed on the sewing machine table 11, and a cloth feeding mechanism that feeds a cloth made of the body cloth M and the ball cloth B. As a large press feed mechanism 20, a binder 30 that presses the top of the cloth B from the upper side of the cloth M, and a stitch forming mechanism that performs needle drop on both sides of the cut S in the vicinity of the front end of the binder 30 in the cloth feed direction F. As shown in FIG. 2, the stitch S is cut on the sewing material 41 composed of the fabrics B and M, which are placed in a state where the center knife 51 as a moving knife is moved up and down on the front side in the cloth feeding direction F of each sewing needle 41. The center knife mechanism 50 as a moving knife mechanism for forming the linear knife and the linear slits S are respectively provided corresponding to the openings 11a of the sewing machine table 11, respectively. Namesu raise and comprises corner knife mechanisms 100A to form a substantially V-shaped cut V, and 100B, an operation control unit 80 for controlling the above units.
Each part is described in detail below.

(Sewing table and sewing frame)
The sewing machine table 11 is used in a horizontal state with its upper surface parallel to the XY plane. The upper surface of the sewing machine table 11 is formed in a long rectangular shape along the cloth feeding direction F, that is, the X-axis direction. A large press feed mechanism 20 and a binder 30 are disposed on the sewing machine table 11, and corner knife mechanisms 100 </ b> A and 100 </ b> B are disposed on the lower side of the sewing machine table 11.
A needle plate 13 is provided at a position below the two sewing needles 41, 41 in the sewing machine table 11. The needle plate 13 is provided with a needle hole corresponding to each of the two needles 41 and 41, and a horizontal hook (not shown) is provided below each needle hole. That is, the sewing thread inserted into each of the sewing needles 41, 41 is captured by the corresponding horizontal hook at the lower side of the needle plate 13, and is entangled with the lower thread fed from the horizontal hook so that the sewing is performed. It has become.
Furthermore, a slit into which the center knife 51 is inserted is formed in the middle of the two needle holes of the needle plate 13 and on the front side in the cloth feeding direction F, and in cooperation with the center knife 51 inside the slit. A fixed knife (not shown) for cutting the fabric is disposed.
Further, an opening portion 11a for allowing the corner knife of the corner knife mechanisms 100A and 100B to appear and disappear from below is formed on the downstream side of the needle hole 13 in the cloth feeding direction.

  The sewing machine frame 12 extends along the Y-axis direction from the bed portion 12a disposed immediately next to the middle position in the longitudinal direction of the sewing machine table 11, the vertical body portion 12b erected from the bed portion, and the upper end portion of the vertical body portion 12b. The arm portion 12c is extended, and the main components of the needle vertical movement mechanism 40 and the center knife mechanism 50 are stored in the arm portion 12c. Further, the two needles 41 and 41 and the center knife 51 are supported in a suspended manner from the lower end portion on the distal end side of the arm portion 12c.

(Needle vertical movement mechanism)
FIG. 3 is a perspective view of the needle vertical movement mechanism 40. The needle up-and-down moving mechanism 40 includes two sewing needles 41 and 41 constituting two needles, two needle bars 42 that individually hold the sewing needles 41 at the lower end, and each needle bar 42 can be moved up and down. A support frame 49 supported by the needle, a needle bar holder 44 for simultaneously holding the two needle bars 42, a sewing machine spindle motor 45 serving as a driving source for the vertical movement of the sewing needle, and a rotational drive by the sewing machine spindle motor 45 (FIG. 10). A sewing machine main shaft 46, a rotating weight 47 fixedly connected to one end of the sewing machine main shaft 46 and rotating, and one end connected to a position eccentric from the center of rotation of the rotating weight 47 and the other end of the needle bar And a crank rod 48 connected to the hugging 44.

  The sewing machine main shaft 46 is also rotatably supported in the Y-axis direction inside the arm portion 12 c, and a rotational driving force of full rotation is applied by the sewing machine main shaft motor 45. When the sewing machine main shaft 46 is rotated, the rotary weight 47 rotates in the same manner, and one end portion of the crank rod 48 performs a circular motion around the sewing machine main shaft 46, and the other end portion has a circular motion Z on one end side. Only the axial movement component is transmitted to the needle bar holder 44 so that each needle bar 42 reciprocates up and down.

Further, the needle bar holder 44 has a built-in latch mechanism (not shown) capable of switching between holding and releasing of the needle bars 41, 41, and holding and holding the needle bars 41 at the upper end of the support frame 49. A holding mechanism (not shown) capable of switching the release is incorporated. Further, the latch mechanism and the holding mechanism can be switched between holding and releasing the needle bar 41 by applying a predetermined operation from the outside, and a needle switching solenoid 43 that performs a switching operation on each mechanism (see FIG. 10). Is attached to the support frame 49.
With this needle switching solenoid 43, both the needle bars 41, 41 are held by the latch mechanism, one needle bar 41 is held by the latch mechanism, and the other needle bar 41 is held by the holding mechanism, The state where one needle bar 41 is held by the holding mechanism and the other needle bar 41 is held by the latch mechanism can be switched.
When performing slant-shaped bead stitching, the above three holding states are switched at the timing of determination, so that one of the left and right straight stitches TL, TR is formed in advance, and one of the left and right straight stitches TL, The formation of TR is terminated first.

(Center knife mechanism)
FIG. 4 is a perspective view of the needle up-and-down moving mechanism 40 and the center knife mechanism 50 in a severable state.
The center knife mechanism 50 is fixed to the center knife 51 that forms a linear cut S by moving up and down, and is fixed below the needle plate 13 and slidably contacts the center knife 51 to promote cutting of the fabrics B and M. A scalpel, a scalpel bar 52 provided with a center scalpel 51 at the lower end and supported so as to be slidable along the Z-axis direction in the arm portion 12c; a scalpel motor 57 that is a stepping motor for moving the center scalpel 51 up and down; A plurality of link bodies 59 that transmit a vertical movement driving force to the knife rod 52 via an eccentric cam 58 that is eccentrically attached to the output shaft 57b of the knife motor 57, and a state where the center knife 51 can be cut (lower position). An air cylinder 65 as an actuator serving as a drive source for switching operation to the cutting restriction state (upper position) and a plunger when the air cylinder 65 protrudes are provided. And a stopper 68 for stopping at the position.

  The center knife mechanism 50 is in a severable state in which the rotational driving force of the knife motor 57 is converted into an up and down reciprocating motion to the center knife 51 and transmitted when the air cylinder 65 is in the retracted position (the state shown in FIG. 4). When the air cylinder 65 is in the forward position (not shown), it is possible to switch to a cutting restriction state in which the rotational driving force of the knife motor 57 is not transmitted to the center knife 51.

When the knife motor 57 is driven to rotate while the air cylinder 65 is retracted, the knife rod 52 and the center knife are interposed via the plurality of link bodies 59 by the eccentric cam 58 provided on the output shaft 57b directed in the Y-axis direction. The cutting operation is performed by moving 51 up and down.
On the other hand, when the air cylinder 65 is in the advanced state, the plurality of link bodies 59 are arranged so that the power of the female motor 57 is not transmitted to the female bar 52 and the center knife 51 is retracted above the needle plate 13. Is maintained.
Accordingly, the air knife 65 is driven so that the center knife 51 can be switched between the cutting-capable state and the cutting restriction state.

(binder)
The binder 30 includes a bottom plate portion 31 that is a long flat plate, a standing plate portion 32 that is erected vertically on the upper surface along the longitudinal direction of the bottom plate portion 31, and a front end portion in the cloth feeding direction of the standing plate portion 32. In addition, a guide member 33 that guides the ball cloth B while avoiding the center knife 51 and a vertical guide that guides the both ends in the width direction of the ball cloth B to be fed along both surfaces of the upright plate portion 32 (illustrated). Abbreviation).
The binder 30 is supported by a support mechanism (not shown) including an air cylinder, and is retracted away from the position below the needles 41 and 41 when not in use, as shown in FIG. And in use, it is set to the needle plate position by driving the air cylinder.

The bottom plate portion 31 is formed in a rectangular shape, and is supported so that, when in use, the longitudinal direction thereof is parallel to the X-axis direction and the bottom surface thereof is placed facing the upper surface of the sewing machine table 11. ing. In addition, a substantially U-shaped notch (not shown) is formed at the front end portion of the bottom plate portion 31 in the cloth feeding direction so that the two sewing needles 41 and 41 respectively perform needle dropping.
The standing plate portion 32 is entirely flat except for a portion in the vicinity of the guide member 33, and on the upper surface of the bottom plate portion 31, the bottom plate portion is located at an intermediate position in the width direction (Y-axis direction) of the bottom plate portion 31. It is erected vertically with the longitudinal direction aligned with 31. That is, the binder 30 is integrally formed so that the bottom plate portion 31 and the upright plate portion 32 have an inverted T shape when viewed from the longitudinal direction.

Then, when the ball cloth B is set on the needle plate 13 so as to overlap the cloth M, the binder 30 is placed from above, and both ends of the width direction of the ball cloth B (the left-right direction in FIG. 2). Is turned up from both ends in the width direction of the bottom plate portion 31, and further, both end portions in the width direction of the ball cloth B are respectively along the side surfaces on both sides of the standing plate portion 32 so as to be described later. , 21. In other words, the ball cloth B is placed from one side surface of the standing plate portion 32 to the other side surface 32 through the bottom plate portion 31. In this way, while setting the ball cloth B around the binder 30, while feeding the ball cloth B and the body cloth M, sewing is performed with the two needles 41, 41 on both sides of the standing plate portion 32 and the center knife. A straight cut line S is formed by the vertical movement of 51.
Further, a guide member 33 is provided immediately in front of the cloth feeding direction F of the binder 30 so as not to be torn by the center knife 51. The guide member 33 is bifurcated in the same direction F so that the shape in plan view is substantially V-shaped. With this shape, both ends in the width direction of the ball cloth B are guided in a direction away from the upright plate portion 32 and are guided in a direction to avoid the center knife 51 when the cloth is fed.

(Large press feed mechanism)
The large presser feed mechanism 20 includes large pressers 21 and 21 that press the cloth M from above on both sides in the width direction of the ball cloth B set on the binder 30, and a support body 22 that supports the large pressers 21 and 21. An air cylinder (not shown) that moves the large pressers 21 and 21 up and down via the support 22 and the width direction both ends of the ball cloth B are bound to each other by being built in each large presser 21 and 21 and moving inward to each other. A folding plate (not shown) that is folded above the bottom plate portion 31 of 30 and a presser as feed driving means for moving the cloth B and body cloth M pressed by the large pressers 21 and 21 in the cloth feed direction F via the support 22. And a motor 23 (FIG. 10).
Each of the large pressers 21 and 21 is a rectangular flat plate, and each of the large pressers 21 and 21 is supported by the support body 22 in a state where the longitudinal direction is along the X-axis direction. The large pressers 21 and 21 are supported so that the flat plate surfaces thereof are parallel to the XY plane. Then, it can be switched to two upper and lower positions by driving the air cylinder. When the air cylinder is in the upper position, it is separated from the upper surface of the sewing machine table 11 and becomes the upper surface height of the sewing machine table 11 at the lower position. The two large pressers 21 and 21 are supported in a state of being separated from each other in the Y-axis direction so that at least the standing plate portion 32 of the binder 30 can pass between them.
The support 22 is supported on the sewing machine table 11 so as to be movable along the X-axis direction, and the two large pressers 21 and 21 to be supported pass outside the vertical movement path of the two needles 41 and 41. Is arranged. The support 22 is driven by a pressing motor 23 through a ball screw mechanism (not shown).

(Corner knife mechanism)
FIG. 5 is a perspective view of each corner knife mechanism 100A, 100B, FIG. 6 is an enlarged perspective view showing the equipped state of each corner knife 101-104, and FIG. 7 is an explanation showing the selection operation of the corner knife 101-104 that moves up and down. 8 is a plan view showing a state in which the corner knife mechanisms 100A and 100B are in a maintenance position to be described later, and FIG. 9 is a side view in the same position. In addition, in FIG. 5, each corner knife mechanism 100A, 100B has shown the state which removed two of the four corner knife 101-104.

  The two corner knife mechanisms 100A and 100B are supported by a common corner knife support mechanism 6. The corner knife support mechanism 6 has guide shafts 4 and 4 parallel to the X-axis direction that support unit bodies 105 of the corner knife mechanisms 100A and 100B, which will be described later, at both ends in the Y-axis direction (the guide shafts on the front side in FIG. 5). 4 is omitted, and the guide shaft 4 on the back side is omitted in FIGS. 8 and 9), and the guide shafts 4 and 4 are held and moved along the Y-axis direction with respect to the sewing machine table 11. The rail guide 5 is provided.

Each of the guide shafts 4 is disposed along the X-axis direction, fixedly holds the unit main body 105 of the corner knife mechanism 100A, and supports the unit main body 105 of the corner knife mechanism 100B so as to be slidable along the X-axis direction. doing.
The rail guide 5 is mounted on the sewing machine table 11 via a support rail 7 that slidably supports the rail guide 5 along the Y-axis direction on the lower surface side of the sewing machine table 11. The rail guide 5 holds both end portions of each guide shaft 4, and the respective corner knife mechanisms 100 </ b> A and 100 </ b> B can be moved in the Y-axis direction via the respective guide shafts 4. Further, the rail guide 5 restricts each corner knife mechanism 100A, 100B to the range of movement between the operating position and the maintenance position with respect to the sewing machine table 11. The operating position is a position at which the corner knife that moves the corner knife mechanisms 100A, 100B vertically cuts between two lines along the X-axis direction passing through the sewing needles 41. In addition, the corner knife can be projected and retracted from the opening 11 a of the sewing machine table 11. In such an operating position, each corner knife mechanism 100A, 100B executes a cutting operation.
On the other hand, the maintenance position is a position to the left of the operating position, and the entire unit main body 105 of each corner knife mechanism 100A, 100B does not completely come out beyond the outer (left) edge of the sewing machine table 11. (Position shown in FIGS. 8 and 9). Maintenance work of each corner knife mechanism 100A, 100B is performed at the maintenance position.

Each of the corner knife mechanisms 100A and 100B is positioned at both ends of the linear cut S by passing the ball B and the body cloth M conveyed by the large presser feed mechanism 20 from below with a pair of corner knife. A substantially V-shaped cut is formed.
Each corner knife mechanism 100A, 100B is arranged along the cloth feeding direction F, and the corner knife mechanism 100A is arranged behind the corner knife mechanism 100B. That is, one corner knife mechanism 100A forms a corner cut on the rear end side of the straight cut S, and the other corner knife mechanism 100B forms a corner cut on the front end side of the straight cut S. . Only the corner knife mechanism 100B is mounted on the table 11 so that it can be moved and positioned along the cloth feeding direction F by the unit moving motor 90 (see FIG. 10). Hereinafter, when the two corner knife mechanisms are described separately, the corner knife mechanism 100A may be referred to as a “fixed side” and the corner knife mechanism 100B may be referred to as a “moving side”.
Since the corner knife mechanism 100A and the corner knife mechanism 100B have substantially the same structure that is mirror-symmetric with respect to the YZ plane, the details are performed only for the corner knife mechanism 100B and the mirror-symmetric structure. The components of the corner knife mechanism 100A are denoted by the same reference numerals and description thereof is omitted.

  The corner knife mechanism 100B includes four corner knives 101, 102, 103, 104, a unit main body 105 supported by a pair of round bar-shaped guide shafts 4 disposed on the lower surface side of the table 11, and An index 106 as a female base, which is a block-shaped structure that is supported in a recessed manner 105a formed on the rear side surface so as to be movable in the Y-axis direction and holds the corner knives 101 to 104, and an index 106 An index movement mechanism 120 as a corner knife selection mechanism for moving and positioning the knife in the Y-axis direction, and a vertical movement mechanism 130 for selecting and moving the corner knife in cooperation with the index movement mechanism 120 are provided. .

  The unit main body 105 has a frame shape and is supported in a state where a pair of guide shafts 4 and 4 are inserted at both ends in the Y-axis direction. Further, a concave portion 105a is formed on one side surface that is the rear side of the unit main body 105, and an index 106 is disposed inside the concave portion 105a. Although the unit body 105 of the corner knife mechanism 100A is fixedly supported, the unit body 105 of the corner knife mechanism 100B is driven in the X-axis direction by driving the unit moving motor 90 via a belt feed mechanism or a ball screw mechanism (not shown). It can be positioned at any position. Further, a linear motor may be employed as the unit moving motor 90.

  The index 106 is fixedly equipped with two upper and lower support rods 106a extending along the Y-axis direction from one side surface in the Y-axis direction, and these are inserted into insertion holes provided on the unit body 105 side. Thus, the index 106 is supported with respect to the unit main body 105 so as to be movable along the Y-axis direction.

Four corner knife mounting bases 107, 108, 109, and 110 are provided on the upper surface of the index 106, and each of the mounting bases 107 to 110 individually holds the corner knife 101 to 104. Each of the mounting bases 107 to 110 can adjust the angle of the corner knives 101 to 104 around the Z axis and the inclination angle of the tooth tip by loosening a fastening screw (not shown). . For each corner knife 101-104, the angle of formation of the corner cut with respect to the straight line cut S is determined by adjusting the angle around the Z axis, and the length of formation of the corner cut is determined by adjusting the inclination angle of the tooth tip.
Here, the example of adjustment of each corner knife 101-104 seen from upper direction is demonstrated based on FIG. 7 (B). The two right corner knives 101 and 102 are for forming a corner cut formed on the right side with respect to the straight cut S, and each of them is inclined toward the right side toward the front. The corner knife 102 is inclined so that the formation length of the corner cut is longer. Further, the widths h1 and h2 in the Y-axis direction of the corner breaks formed by the corner knives 101 and 102 are adjusted to be equal.
The two left corner knives 103 and 104 are for forming a corner cut formed on the left side with respect to the straight cut S, and each of them is inclined toward the left side toward the front. The corner knife 104 is inclined so that the formation length of the corner cut is longer. Similarly to the corner knives 101 and 102, the widths h1 and h2 in the Y-axis direction of the corner breaks formed by the respective corner knives 103 and 104 are adjusted to be equal.

  Further, each mounting base 107 to 110 has a sliding shaft (not shown) along the Z-axis direction on the lower side thereof, and is supported so as to move up and down with respect to the index 106 by sliding of the shaft. ing. And the raising / lowering brackets 107a-110a which are the engagement protrusions which protruded ahead are formed in the lower end part of the said each sliding shaft. These lift brackets 107a to 110a protrude forward from the front surface of the index 106, and a vertical movement mechanism 130 described later moves the corner knives 101 to 104 up and down via the lift brackets 107a to 110a. It has become.

The index moving mechanism 120 is connected to an index motor 121 as a selection driving means fixedly mounted on the upper part of the unit main body 105, a screw shaft 122 that is rotationally driven by the index motor 121, and a ball screw connected to the screw shaft 122. The moving body 123 is provided.
The screw shaft 122 is rotatably supported on the upper surface of the unit main body 105 in a state along the Y-axis direction, and one end of the screw shaft 122 is coupled to the output shaft of the index motor 121 through a coupling.
The moving body 123 is held by an arm portion 106 b extending from one end portion of the index 106 in the Y-axis direction. Thus, when the screw shaft 122 is rotationally driven by the index motor 121, the moving body 123 receives a moving force in the longitudinal direction (Y-axis direction) of the screw shaft 122 by the action of the ball screw mechanism, and the index 106 moves in the Y-axis direction. Is done.
The movement of the index 106 in the Y-axis direction by the index moving mechanism 120 is used and selected when a pair of corner knives to be moved up and down by a vertical movement mechanism 130 described later is selected from the corner knives 101 to 104. It is also used when adjusting the position of the corner cut by the corner knife in the Y-axis direction.

  In order to form a corner cut on the left side of the straight cut S, the vertical movement mechanism 130 has a first air cylinder 131 as a raising drive means for raising the corner knife to form a corner cut on the right side of the straight cut S. A second air cylinder 132 as an ascending drive means for raising the corner knife, and an engaging member provided on the output shaft of each of the air cylinders 131 and 132 and selectively engageable with the aforementioned lifting brackets 107a to 110a. Cylinder brackets 133 and 134.

The air cylinders 131 and 132 are mounted on the unit main body 105 so that their operating directions are parallel to the Z-axis direction.
Each cylinder bracket 133, 134 is a drum-shaped member formed by reducing the diameter of only the middle part of the cylinder in the axial direction, and the output of each air cylinder 131, 132 with its center line oriented in the Z-axis direction. Equipped on the shaft. Then, when the index 106 moves along the Y-axis direction, each air cylinder 131 so that the tip end portions of the lifting brackets 107a to 110a pass between the portions where the diameters of the cylinder brackets 133 and 134 are reduced. 132 and cylinder brackets 133 and 134 are disposed in the unit main body 105.

That is, when the index 106 moves along the Y-axis direction, the lifting brackets 107a to 110a pass between the small-diameter portions of the cylinder brackets 133 and 134 in the arrangement order, and thus are the operation targets. By controlling the index motor 121 of the index moving mechanism 120 so that the lifting bracket of the corner knife stops between the small diameter portions of the cylinder bracket 133 or 134, the predetermined lifting bracket and the cylinder bracket are engaged with each other. Alternatively, the predetermined corner knife can be moved up and down by driving the second air cylinders 131 and 132.
On the lower surface of the unit main body 105, when the index 106 is in a position where (1) the lifting bracket 107a of the corner knife 101 is engaged with the cylinder bracket 133, (2) the lifting bracket 108a of the corner knife 102 is the cylinder bracket 133. (3) When the raising / lowering bracket 109a of the corner knife 103 is at the position where it engages with the cylinder bracket 134, (4) The raising / lowering bracket 110a of the corner knife 104 engages with the cylinder bracket 134. If the position is in the position, (5) if the index 106 is at the origin position with respect to the unit body 105, and (6) if the index 106 is in the leftmost position with respect to the unit body 105. Is provided with an optical index sensor 111 (see FIG. 10). , And positioning control is performed index 106 by such sensor detection.
The origin position of the index 106 refers to a position where the midpoint between the corner knives 101 and 103 on the index 106 and the midpoint between the two cylinder brackets 133 and 134 coincide in the Y-axis direction.
Note that the states (1) to (4) are the states where the corner knives 101 to 104 are at the cutting positions.

  The overlapping range of the cylinder brackets 133 and 134 and the lifting brackets 107a to 110a is somewhat wider in the Y-axis direction as shown in FIG. , 134, the engagement state can be maintained even if the elevating brackets 107a to 110a are somewhat moved in the Y-axis direction. And each corner knife 101-104 is moved to a Y-axis direction in the range which can maintain the said engagement state, and it is possible to adjust the position of a cutting position.

(Control system for hem stitch machine)
FIG. 10 is a block diagram showing a control system including the operation control means 80 of the edge stitch sewing machine 10.
The operation control means 80 includes input / output (not shown) of a display input means 85 for displaying predetermined characters or image information and inputting for making various settings, and a start switch 87 for inputting the start of sewing. It is connected through a circuit. Further, the operation control means 80 is connected to an encoder 88 for detecting the rotation speed of the sewing machine spindle motor 45 via an input circuit 88a, and can detect a rotation angle and a rotation speed from a predetermined origin. It has become.
Further, the operation control means 80 includes a sewing machine spindle motor 45, a presser motor 23, a female motor 57, a unit moving motor 90, and an index motor 121, which are to be controlled, via drivers 45a, 23a, 57a, 90a, and 121a, respectively. It is connected.
In addition, an electromagnetic valve (not shown) that drives an air cylinder that moves the binder 30 up and down and an air cylinder that moves the large pressers 21 and 21 up and down is connected to the operation control means 80 via a driver. Similarly, the solenoid valve 70 of the air cylinder 65 for switching the operation state of the center knife 51 and the non-operation state, the solenoid valves 135 and 136 of the first and second air cylinders 131 and 132 for raising and lowering the corner knife, and the sewing thread. An electromagnetic valve 89 for driving a knife driving cylinder (not shown) for driving a knife for cutting is connected via drivers 70a, 135a, 136a, 89a.
Further, the above-described index sensor 111 is connected to the operation control means 80 via an input circuit 111a.
Further, the above-described needle switching solenoid 43 is connected to the operation control means 80 via a driver 43a.
Note that although two corner knife mechanisms are provided, in FIG. 10, only one corner knife mechanism is shown, and the other one is omitted.

  The operation control means 80 includes a CPU 81 for performing various processes and controls, a ROM 82 in which an operation control program for executing the operation control of the edge stitch sewing machine 10 is written, and a work area for storing various data in the processing of the CPU 81. And an EEPROM 71 for recording sewing data and various setting data.

The CPU 81 executes a series of setting conditions necessary for the edge stitching such as the stitch length of the straight stitch, the deviation before and after, the sewing pitch, the number of stitches, the selection condition of each corner knife, etc. by executing the operation control program stored in the ROM 82. The operation of each part is controlled according to what is selected from a plurality of pieces of sewing data recorded with “” and sewing is executed.
Further, the CPU 81 controls the index motor 121 of each corner knife mechanism 100A, 100B after the binder 30 descends when sewing is started as part of a plurality of steps executed by the operation control program. In accordance with the detection of the index sensor 111, control is performed with the index 106 as the origin position. When the corner cut is formed, the operation of the index motor 121 is controlled so that the index 106 moves to a position where the corner knife selected from the origin position engages with the first or second air cylinder 131, 132. . Further, when a fine adjustment value of the position in the Y-axis direction is set for each corner break, the operation of the index motor 121 is controlled so that the index 106 moves so as to reflect the fine adjustment value when the corner knife is selected. Is done.
Further, when the CPU 81 completes the formation of the corner break by driving the first and second air cylinders 131 and 132 for forming the corner break as a part of the plurality of steps executed by the operation control program. In accordance with the detection of the index sensor 111, the operation of the index motor 121 is controlled so that the index 106 moves to the leftmost position (position (6) described above) with respect to the unit main body 105.
If the index 106 of each corner knife mechanism 100A, 100B is located at the above-mentioned maintenance position, all the corner knife 101 to 104 are outside the edge of the sewing machine table 11 (left side). The index 106 is positioned outside the end edge of the sewing machine table 11 up to a predetermined position.
If all the corner knives 101 to 104 are located on the left side of the left end of the sewing machine table 11, the movement position of the index 106 after the completion of driving the air cylinders 131 and 132 is on the right side of the leftmost position. May be set.

(Ball stitching operation control)
FIG. 11 is a flowchart showing the main operation control of the edge stitch, and FIGS. 12 to 14 are flowcharts showing the subroutine of FIG. The processes shown in these flowcharts are all executed by the CPU 81 by executing the operation control program. Hereinafter, the operation control of the edge stitching will be described.
As shown in FIG. 11, when a sewing start switch (not shown) is input, the CPU 81 sets the body cloth M and the ball cloth T to the edge stitch sewing machine 10 when sewing the edge stitch. Operation control of the set operation is performed (step S10), then operation control of the sewing operation for forming the straight stitches TL and TR and the straight cut S is performed (step S20), and then the operation of the sewing end operation for forming the corner cut is performed. Control is performed (step S30). If the sewing start switch is input again, the processes in steps S10 to S30 are repeatedly executed.

Next, based on FIG. 12, the operation control of the setting operation of the body cloth M and the ball cloth B shown in step S10 will be described in detail.
First, the CPU 81 holds the large pressers 21 and 21 at the foremost origin position so as to move to the cloth holding position behind the sewing needle with the cloth M placed at a predetermined position on the sewing machine table 11. The motor 23 is driven (step S11). Then, operation control for lowering each large presser 21 by driving an air cylinder (not shown) is performed to hold the cloth M in the large presser (step S12).
Next, the CPU 81 drives an air cylinder (not shown) that raises and lowers the binder 30 with the ball cloth B placed on the upper surfaces of the large pressers 21 and 21, and lowers the binder 30 from the top of the ball cloth B (step). S13). Then, after the binder 30 is lowered, operation control is performed with the index 106 of each corner knife mechanism 100A, 100B as the origin position (step S14).
On the other hand, as the binder 30 descends, both ends of the ball cloth B are raised in the gaps between the large pressers 21 and 21 and the binder 30, so that the CPU 81 folds the folding plates in the large pressers 21 and 21. The operation control which drives the air cylinder which is not shown in figure which moves to the binder 30 side is performed, and the folding to the upper surface side of the baseplate part 31 of the binder 30 of the both ends of the ball cloth B is performed (step S15).
Further, when the flap presser is mounted on the large presser 41, an operation control for holding the flap cloth (not shown) on the upper surface of the large presser 41 by operating the drive cylinder is executed (step S16). Thereby, the operation control of the set operation is finished.

Next, based on FIG. 13, the operation control of the sewing operation following the set operation will be described in detail.
After the set operation is completed, the CPU 81 drives the presser motor 23 to carry the fabrics B and M held by the large pressers 21 and 21 toward the position where the sewing start position is directly below the sewing needles 41 and 41. (Step S21). When the sewing start position of the fabric reaches the needle lower position, the sewing machine spindle motor 45 is started to start sewing (step S22). At this time, when the deviation is set, the CPU 81 controls the needle switching solenoid 43 to move only the preceding sewing needle 41 up and down and to switch to sewing of both needles at a timing according to the deviation. Execute. Further, the operation of the knife driving cylinder is controlled so that the formation of the straight cut is started at a predetermined timing from the start of sewing according to the positional relationship between the sewing needle 41 and the center knife 51.
Thereafter, the CPU 81 determines whether or not the required number of stitches has been performed according to the setting of the sewing data (step S23). If the required number has not been reached, the speed of the presser motor 23 is controlled according to the set pitch. On the other hand, the sewing is continued (step S24), and when the necessary number is reached, the sewing operation is finished. Also in this case, when the deviation is set, the sewing is performed with one needle by the deviation, and the formation of the straight cut is finished according to the positional relationship between the sewing needle 41 and the center knife 51. Controls stopping of drive cylinder. Thereby, the operation control of the sewing operation is completed.

Next, based on FIG. 14, the operation control of the sewing end operation following the sewing operation will be described in detail.
When the sewing operation is completed, the fabric is conveyed to the opening by driving the pressing motor 23. Then, before and after the conveyance, the CPU 81 controls the unit moving motor 90 so that the corner knife mechanism 100B is forward by a predetermined distance with respect to the corner knife mechanism 100A from the set length of the straight cut and the straight stitch. Execute alignment. In addition, operation control is performed in which the index knife 106 of each corner knife mechanism 100A, 100B is positioned at a position where the elevation brackets 107a to 110a of the corner knife that are scheduled to be used from the origin position engage with any one of the cylinder brackets 133, 134. (Step S31).
Then, the CPU 81 uses both the driving of the unit moving motor 90 and the driving of the holding motor 23 or controls either of them independently to align the fabric and each corner knife so as to be in an appropriate position. Then, the first or second air cylinder 131, 132 of each corner knife mechanism 100A, 100B is driven to form a corner break (step S32).
Then, after the corner break is formed, the CPU 81 executes an operation control for setting the index 106 to the leftmost position with respect to the index motor 121 of each corner knife mechanism 100A, 100B according to the detection of the index sensor 111 (step S33). . Further, after the large pressers 21 and 21 are lifted to release the fabric, each large presser returns to the origin position, and the operation control of the sewing end operation is finished.

(Effects of the hem-sewing machine)
With the above-described operation control, in the edge stitch sewing machine 10, each corner knife mechanism 100 </ b> A, 100 </ b> B is from the formation of a corner cut to one cloth until the movement of the corner knife to the origin position in the next cloth setting operation. The index 106 is retained in the leftmost position. As a result, each index 106 is moved to a predetermined position (leftmost position) “at least from the completion of sewing of one sewing product to the start of sewing of the next sewing product”.
As described above, in the above-described bead stitch sewing machine 10, after the corner cut which is the end of sewing is formed, operation control is performed to move the index 106 of each corner knife mechanism 100 </ b> A, 100 </ b> B to the leftmost position. When the corner knife mechanisms 100A and 100B are pulled out to the maintenance position in a state where they are not, all the corner knife 101 to 104 are moved from the left end of the sewing machine table 11 as shown in FIGS. 8 (A) and 9 (A). It can be pulled out to the left. FIGS. 8B and 9B show a comparative example in which each index 106 is left at the origin position. As can be seen from the comparison between FIG. 8 (A), FIG. 9 (A) and FIG. 8 (B), FIG. 9 (B), according to the operation control by the operation control means 80 of the edge stitch sewing machine 10, The corner knife 101 to 104 is removed from the state covered with the sewing machine table 11 from above, and various maintenance work such as knife replacement and adjustment can be easily performed from above, thereby improving workability. Is possible.
Further, since each index knife mechanism 100A, 100B is located at the maintenance position and the index 106 is moved to the left, the left corner of each corner knife mechanism 100A, 100B is left by the amount of leftward movement of the index 106. Since the amount of movement can be reduced, the maintenance position of each corner knife mechanism 100A, 100B can be set to the right, and even if the corner knife support mechanism adopts a cantilever support structure, It is possible to improve the strength against the load in the direction.

(Other)
The movement of each index 106 of the corner knife mechanisms 100A and 100B to the origin position is not limited to the execution after the binder 30 is lowered. It may be executed at any timing from the start of the set operation to the start of the sewing end operation.
Further, each index 106 of the corner knife mechanisms 100A and 100B is moved to the leftmost position at any timing from the completion of the formation of the corner cut until the movement of each index 106 to the origin position is executed. However, when each corner knife mechanism 100A, 100B is moved to the maintenance position in order to perform maintenance, it is desirable that each index 106 is always at the leftmost position. It is desirable that the residence time at the position is long. Further, it is desirable that each index 106 be in the leftmost position when the main power supply is turned off.
In the above-described corner knife mechanism, the origin position of the index 106 is different from the leftmost position. Of course, the leftmost position may also be used as the origin position. This is desirable in that the staying period at the leftmost position becomes longer.

In addition, although the above-described corner knife mechanism is equipped with two types of corner knife on the left and right, it goes without saying that more types of corner knife may be prepared.
In addition, the purpose of preparing a plurality of corner knives is not limited to the case where the purpose is to individually cope with the difference in the length of the cut length and the difference in the inclination angle of the cut, for example, a corner for a spare Any purpose may be used, such as mounting a plurality of corner knives to prepare a knives.
Further, in the above-described corner knife mechanism, the two air cylinders 131 and 132 of the vertical movement mechanism 130 are provided, and two corner cuts can be simultaneously formed by simultaneously raising the two corner knifes. Alternatively, only one air cylinder may be provided, and a desired corner knife may be moved to an ascending position by the air cylinder so as to form corner cuts one by one.

The corner knife mechanisms 100A and 100B can position the index 106 at an arbitrary position in the Y-axis direction by the index motor 121. However, if fine adjustment in the Y-axis direction is not required, the index motor Instead of 121, an air cylinder or solenoid capable of position switching driving at a plurality of fixed positions may be used.
FIG. 15 is a schematic diagram illustrating a configuration example in which the position switching drive of the index 106 can be realized using two air cylinders 125 and 126 capable of switching between two positions. Since the configuration other than the air cylinders 125 and 126 is the same as that described above, the same reference numerals are given and redundant description is omitted.
The index 106 is supported so as to be movable along the Y-axis direction with respect to the unit main body 105. The air cylinder 125 has a distal end portion of a plunger portion that moves forward and backward between two positions fixedly connected to the index 106. On the other hand, the air cylinder 126 functions as a stopper that stops the index 106 at two positions when a plunger that moves forward and backward between the two positions contacts the side surface of the index 106.
The index 106 includes a position where the lifting bracket 108a of the corner knife 102 is engaged with the cylinder bracket 133 (leftmost position: FIG. 15A), and the lifting brackets 107a and 108a of the corner knife 101, 102 are the cylinder bracket 133, It is possible to switch between a position engaged with 134 (center position: FIG. 15B) and a position where the lifting bracket 110a of the corner knife 104 engages with the cylinder bracket 134 (rightmost position: FIG. 15C). There must be.
The air cylinder 125 is set such that the plunger movement range can switch the index 106 between the leftmost position and the rightmost position. On the other hand, the air cylinder 126 is set so that its plunger movement range can be switched between a non-interference position that is to the left of the index 106 at the leftmost position and a central position that is in contact with the index 106. ing. Further, an air cylinder 126 that can hold the position more strongly than the air cylinder 125 is used.
Accordingly, when the index is aligned at a position where the lifting bracket 108a of the corner knife 102 engages with the cylinder bracket 133, the air cylinder 125 is set to the leftmost position and the air cylinder 126 is set to the non-interference position.
When the index 106 is aligned with the position where the lifting brackets 107a and 108a of the corner knives 101 and 102 are engaged with the cylinder brackets 133 and 134, the air cylinder 125 is pulled toward the leftmost position while the air cylinder 125 is pulled toward the leftmost position. When 126 is set to the intermediate position, the air cylinder 126 pushes over the air cylinder 125 and the index 106 can be set to the center position.
Further, when the index is aligned at a position where the lifting bracket 110a of the corner knife 104 engages with the cylinder bracket 134, the air cylinder 125 is set to the rightmost position, and the air cylinder 126 is set to the non-interference position (any position). But it ’s okay).
With the above operation, the index 106 can be switched to the three positions, and the cutting operation using the corner knives 101 to 104 can be performed.

It is a perspective view which shows the schematic structure of the whole edge stitch sewing machine. It is explanatory drawing which shows the arrangement | positioning relationship of the linear cut by the center knife, the cut by a corner knife, and the stitch by a two needle | hook in the bead stitch which forms a diagonal pocket opening part. It is a perspective view of a needle up-and-down movement mechanism. It is a perspective view which shows the cutting | disconnection state of a needle | hook up-and-down moving mechanism and a center knife mechanism. It is a perspective view of each corner knife mechanism. It is an expansion perspective view which shows the installation state of each corner knife. FIG. 7A is an explanatory view showing the selection operation of a corner knife that moves up and down, FIG. 7B is an explanatory view showing an adjustment example of each corner knife, and FIG. 7C is an engagement of the lifting bracket with respect to the cylinder bracket. It is explanatory drawing which shows a combined state. FIG. 8A is a plan view showing a state in which each corner knife mechanism is in the maintenance position in accordance with the operation control of the present invention, and FIG. 8B is a plan view of a comparative example in which the index is maintained at the origin position. is there. FIG. 9A is a side view showing a state where each corner knife mechanism is in the maintenance position in accordance with the operation control of the present invention, and FIG. 9B is a side view of a comparative example in which the index is maintained at the origin position. is there. It is a block diagram which shows the control system containing the operation control means of a bead stitch sewing machine. It is a flowchart which shows the main operation | movement control of a bead stitch. It is a flowchart which shows the subroutine of FIG. It is a flowchart which shows the subroutine of FIG. It is a flowchart which shows the subroutine of FIG. FIGS. 15A and 15B show the operation of another example of the index moving mechanism, FIG. 15A shows the state at the leftmost position of the index, FIG. 15B shows the state at the center position of the index, and FIG. C) shows the state at the rightmost position of the index.

Explanation of symbols

4 Guide shaft 5 Rail guide 6 Corner knife support mechanism 10 Edge stitch sewing machine 11 Sewing table 80 Operation control means 81 CPU
90 unit moving motor 100A, 100B corner knife mechanism 101, 102, 103, 104 corner knife 105 unit body 106 index (female base)
107, 108, 109, 110 Mounting base 107a, 108A, 109A, 110a Lifting bracket 120 Index moving mechanism (selection mechanism)
121 Index motor (drive means for selection)
125, 126 Air cylinder (selection drive means)
130 Vertical movement mechanism 131 First air cylinder (rising drive means)
132 Second air cylinder (rising drive means)
133,134 Cylinder bracket B Ball cloth F Cloth feed direction M Body cloth S Straight cut (pocket hole)
TL, TR Seam VFL, VFR, VRL, VRR Corner cut

Claims (1)

A corner knife mechanism having a plurality of corner knives arranged below the sewing machine table and raised from an opening provided in the sewing machine table by driving of the raising drive means to form a corner cut in the sewing product;
An operation under the sewing machine table that has a rail guide provided along a direction orthogonal to the cloth feeding direction, and that performs the corner knife mechanism to form a corner cut for the workpiece through the rail guide. A corner knife support mechanism which supports the position and a maintenance position which is the outer edge of the sewing machine table so as to be movable along a direction orthogonal to the cloth feeding direction ;
Control means for driving the ascending drive means to raise the corner knife and forming a corner cut in the sewing product;
The corner knife mechanism is
A main body supported movably along a direction perpendicular to the cloth feeding direction via the rail guide;
A plurality of corner knives arranged side by side in a direction orthogonal to the cloth feed direction, and a knife base that is supported movably in a direction perpendicular to the cloth feed direction with respect to the main body part ,
The knife base is moved in a direction perpendicular to the cloth feed direction with respect to the main body so that any one of the plurality of corner knives is selectively provided with a raising driving force by the raising driving means. An index motor as a selection drive means to be
The control means includes
After controlling the index motor to form a corner cut, the knife base is moved from the position at the time of forming the corner cut to the leftmost position closest to the maintenance position side until the next sewing start. An edge stitch sewing machine that is controlled so as to maintain the state .

Images