JP2009100987A - Piping sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a piping sewing machine capable of easily switching methods for forming appropriate diagonal cuts corresponding to a case requiring quick work or high sewing quality. <P>SOLUTION: In the piping sewing machine, an end position deviation is provided at least one of front and rear ends in a cloth feeding direction of two straight seams and a straight cut so that end positions of the two straight seams are different in the cloth feeding direction. A first cutting control and a second cutting control are selectively performed to a corner knife mechanism. In the first cutting control, right and left diagonal cuts are formed so that the right and left cutting lengths are equal and that one end of each diagonal cut is made to individually coincide with each end of the right and left straight seams. In the second cutting control, the right and left diagonal cuts are formed so that the right and left cutting lengths are different and that both ends of the right and left diagonal cuts are coincided with the ends of the right and left straight seams and with the end of the straight cut. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an edge stitch sewing machine capable of forming an oblique pocket having an oblique opening.

  For example, ball edge stitching is often performed at an opening of a pocket of a suit, etc., and two seams that are parallel to each other in a state in which a bead is stacked on a body cloth and two stitches that are parallel to them. A straight cut formed between the stitches of the book is formed, and further, V-shaped oblique cuts are formed at both ends in the sewing direction. In 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, diagonal corners are formed by arranging two corner knives with sharp tips in a V shape and simultaneously penetrating them through the body cloth.

On the other hand, there may be a case where a bead stitch is formed to form an oblique pocket having an oblique opening by shifting the position of the stitching end of the two seams.
In such a beveled stitch with an opening having an oblique shape, a deviation length (deviation) between the two stitches having the same cutting length from the state in which the two corner knives are arranged in a V shape and the stitch end position of the two stitches Diagonal cuts have been formed by shifting them by the same length and penetrating the corner knives through the body cloth (for example, see Patent Document 1).

In addition, in other edge stitch sewing machines, the difference in the cutting length and the direction of the knife are adjusted by two corner knives with different cutting lengths in order to form diagonal cuts in the above-described obliquely shaped opening of the edge stitch. By doing so, diagonal corners were formed by penetrating these corner knives through the body cloth while being arranged in a V shape (see, for example, Patent Document 2).
JP 2000-107473 A Japanese Patent Publication No. 1-38519

According to the edge stitch sewing machine described in Patent Document 1, since the corner knife having the same cutting length is used on both the left and right sides, the cutting position of the two corner knives in the cloth feeding direction can be performed even when obliquely shaped ball edge sewing is performed. This can be easily realized by performing only the adjustment.
However, the above-described bead stitch sewing machine has a problem as shown in FIG. 18 (A) and 18 (B) are state explanatory views showing the problems of Patent Document 1, in which symbols TL and TR are seams, S is a straight cut, 201 and 202 are corner knives, Let C be the deviation length (deviation) of the end position near the seam side of the book seam.
When an oblique cut is formed with the deviation C, the distance C ′ from the tip of the straight cut S to the root of the inner corner knife 202 coincides with the deviation C. By the way, the formation of the corner cut by the edge stitch sewing machine is configured so that the corner knife rises after the formation of the linear cut by the center knife mechanism (center cut). When trying to penetrate the corner knife 202 into the body cloth, as shown in FIG. 18B, center cuts are formed on both sides of the insertion position of the corner knife 202, so the body cloth moves in the traveling direction of the corner knife 202. There was an inconvenience that it was turned up and the cutting for the planned cutting length could not be performed.

In addition, the edge stitch sewing machine described in Patent Document 2 forms a diagonal cut in a state where only the center cut of the minimum length is formed, so that a cut length as planned can be ensured and good A perfect finish can be achieved.
However, on the other hand, it is necessary to adjust the cutting length and the direction angle of each corner knife, and there is a problem that the work preparation becomes complicated.
For this reason, in the case of an edge stitch sewing machine capable of forming diagonal pockets, when speedy work is required, the corner knife of the same cutting length is shifted on the left and right to form diagonal cuts, and high sewing quality is required. In the case of forming a slanted cut using two corner knives having different cutting lengths and orientations, the bead can be formed by easily switching between the above two types of slanted cut forming methods. A sewing machine was required.

  The present invention makes it easy to form a suitable oblique cut method for a stitched sewing machine capable of forming diagonal pockets when speeding up the work and when high sewing quality is required. It is an object of the present invention to provide an edge stitch sewing machine that can be formed by switching.

The invention described in claim 1
A cloth feed mechanism that holds and conveys the fabric and the ball cloth;
A needle up-and-down movement mechanism that moves up and down two sewing needles that form two straight stitches parallel to the cloth feed direction and the cloth feed direction;
A moving knife mechanism that forms a straight cut along the cloth feed direction between the two straight stitches;
A corner knife mechanism capable of forming an oblique cut between an end of the two straight stitches and an end of the straight cut;
At least one of the front and rear end portions in the cloth feed direction of each of the straight stitches and the straight cut, the end position deviation is provided so that the end positions of the two straight stitches are different from each other in the cloth feed direction. In addition, the diagonal cut formation control for controlling each of the mechanisms so that the diagonal cut is formed from two diagonal cuts formed along the direction from the end portions of the two straight stitches toward the linear cut. Means,
In the hem sewing machine with
The corner knife mechanism is provided corresponding to each of the front and rear ends of the straight cut,
The oblique cut formation control means, for the corner knife mechanism corresponding to the end portion provided with the end position deviation,
For the diagonal cuts on both the left and right sides across the straight cut, the diagonal cuts are formed in an arrangement in which one of the diagonal cuts is made to coincide with the end of the corresponding straight stitch while making the cut lengths equal to each other. Cutting control,
With respect to the diagonal cuts on the left and right sides across the straight cuts, the respective cut lengths are made different, and the respective diagonal cuts are arranged so that both ends of the respective diagonal cuts coincide with the corresponding straight stitch ends and the straight cut ends. A second cutting control for forming a cut,
It is characterized by being selectively executed.

The invention according to claim 2 has the same configuration as the invention according to claim 1,
The corner knife mechanism includes a long knife that forms an oblique cut with a long cutting length and a short knife that forms a short oblique cut, and the diagonal cuts on both the left and right sides in the first cutting control are both formed with a short knife. And the diagonal cuts on the left and right sides in the second cutting control are formed by a combination of a short knife and a long knife,
A short knife cloth feed direction length storage means for storing a cloth feed direction length of a cutting length by the short knife;
When the diagonal cut formation control unit selects the first cutting control, the length of the cutting length by the short knife from the end of one of the two straight seams extending in the cloth feed direction When the oblique cut formation control means selects the second cutting control, the position closer to the non-extending side by the amount corresponding to the non-extending side is the other end of the two that is not extended. The cloth feed mechanism and the cloth feed mechanism so as to form the straight cut from the end of the straight seam as the end position of the straight cut by a position closer to the non-extension side by the length of the cloth feed direction of the cutting length by the short knife. Center cut formation control means for controlling the moving knife mechanism is provided.

In addition, in the description of claim 2, the term “one extended straight seam” refers to a case where an end position deviation is provided at the front end of the cloth feed direction when sewing two straight seams. In the case of showing a straight seam extending forward in the cloth feed direction and providing an end position deviation at the rear end of the cloth feed direction when sewing two straight seams, the rear side in the cloth feed direction The straight seam extending to the right is shown.
“Near extension side” means the rear side in the cloth feed direction when an end position deviation is provided at the front end of the cloth feed direction when sewing two straight stitches. When the end position deviation is provided at the rear end portion in the cloth feeding direction at the time of sewing the straight seam, the front side in the cloth feeding direction is indicated.

According to the first aspect of the present invention, in the case where an end position deviation is provided at either end of two straight seams, the left and right diagonal cuts having the same cutting length are respectively connected to the end portions of the respective straight seams. A first cutting control for forming a diagonal cut in an arrangement to match
The second oblique line is formed by arranging the left and right oblique cuts having different cutting lengths corresponding to the end position deviations so as to coincide with the end of the straight seam and the end of the straight cut. The cutting control can be selected and executed.
Therefore, the first cutting control is selected when the end position deviation can be changed and the speed of work is required, and the second cutting control is selected when high sewing quality is required. By selecting, it becomes possible to perform appropriate edge sewing according to various requirements and work situations.

In the above description, “deviation” refers to the distance from the end of one straight seam that extends further to the end of the other straight seam that does not extend at both ends in the sewing direction of the edge stitch. The distance difference (CF or CR) in the cloth feeding direction is shown (see FIG. 2).
In the following description, “left and right” refers to a horizontal direction and a direction orthogonal to the cloth feeding direction.

According to the second aspect of the present invention, the position of the end of the straight line is specified based on the end of the straight seam that is extended when the first cutting control is selected, and is extended when the second cutting control is selected. Control for specifying the position of the end of the straight line break is performed on the basis of the end of the straight line stitch that is not.
As shown in FIGS. 11 and 12, when the corner knife mechanism performs the first cutting control and the second cutting control by using two types of corner knife, the length and the length XL in the cloth feed direction of the cutting length by the long knife are short. It is assumed that the difference between the cutting length by the knife and the cloth feed direction length XS coincides with the end position deviation CF (CF = XL−XS). In other words, in the second cutting control, the position and the extension closer to the non-extension side by the length XL of the cutting length of the long knife by the long knife from the end portion PFR (see FIG. 2) of the extended straight seam. As shown in FIG. 12, the position of the cutting length of the straight knife from the end portion PFL (see FIG. 2) of the straight seam that is not extended to the non-extending side by the length XS of the cloth feed direction coincides with each other. If the end position of the straight line is simply set, when the straight line is formed corresponding to the second cutting control, the end position is set to the end of the extended straight seam. It is possible to specify any end of the straight seam that is not extended as a reference.
However, in both cases of the first cutting control and the second cutting control, when the end position of the straight cut is specified with reference to the end PFR of the extended straight seam, the first cutting control When the selection is switched from the control to the second cutting control (or vice versa), the distance from the end of the straight stitch to the end of the straight cut is changed from the length XS to the length XL (or vice versa). ) It will be necessary to set again.
On the other hand, in the second aspect of the invention, the end portion PFR of the straight seam that is extended during the first cutting control is used as a reference, and the end portion PFL of the straight seam that is not extended is used as the reference during the second cutting control. In any case, the end position of the straight cut can be specified based on the cloth feed direction length XS of the cutting length by the short knife. Therefore, when switching between the first and second cutting controls, the distance difference between the end of the straight seam and the end of the straight cut is newly set from the length XS to the length XL (or vice versa). It is possible to reduce the work load to be performed and easily switch the cutting control.

(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.

  2 and 3 show a straight cut S by a center knife and a diagonal cut VFL, VFR, VRL, VRR by a corner knife and a straight stitch TL, TR by two needles in a bead stitch forming an oblique pocket opening. FIG. 2 is an explanatory diagram showing the relationship of the arrangement of the edges, and the edge stitches forming the oblique pocket openings can be performed by the two types of methods shown in FIGS. As shown in the drawing, the traveling direction of the cloth feeding direction F during sewing is the front side of the cloth feeding direction, and the opposite direction is the rear side of the cloth feeding direction, and is one direction along the Y-axis direction and facing the cloth feeding direction. The following description will be given with the left hand direction as the left side and the other direction along the Y-axis direction, which faces the cloth feed direction and the right hand direction as the right side.

The bead stitch sewing machine 10 sews a cloth B to the body cloth M by two parallel straight stitches TL and TR formed by the two needles 41 and 41, and in the feed direction F of these cloths. It is a sewing machine that forms a linear cut S that becomes a pocket hole along the side and a substantially V-shaped corner cut made up of a pair of diagonal cuts at both ends of the cut S.
In the edge stitch forming the oblique pocket opening, the front and rear ends of either one of the straight seams (the right side seam TR in FIG. 2) are in front of the front and rear ends of the other straight seam. It is formed to be located. 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.

  2, a slanted cut VFR is formed from the front end of the straight cut S to the front end of the right straight stitch TR, and a distance equal to the deviation CF from the front end of the straight cut S. An oblique cut VFL is formed from the rear position to the front end of the left straight seam TL. Further, a diagonal cut VRR is formed from a position that is equal to the deviation CR from the rear end of the straight cut S to a rear end of the right straight stitch TR, and a diagonal cut VRR is formed from the rear end of the straight cut S to the left. A diagonal cut VRL is formed over the rear end of the straight seam TL.

  In addition, in the edge stitch shown in FIG. 3, a diagonal 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 left straight stitch TL from the front end of the straight cut S is formed. A diagonal cut VFL is formed over the front end. Further, a diagonal cut VRR is formed from the rear end portion of the straight cut S to the rear end portion of the right straight seam TR, and oblique from the rear end portion of the straight cut S to the rear end portion of the left straight seam TL. A cut VRL is formed. The diagonal cuts VFR and VFL constituting the corner cut are set so that the length in the cloth feed direction is longer by the deviation CF in the VFR, and the diagonal cuts VRR and VRL constituting the corner cut are set in the VRL direction. The length in the cloth feeding direction is set longer by the deviation CR.

The bead-sewn sewing machine 10 can selectively execute the two types of the method shown in FIG. 2 and the method shown in FIG. 3 when performing the bead stitching for forming the oblique pocket opening. .
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. 1, a sewing product comprising a body fabric M and a ball cloth B, which are placed in a state where a 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, is placed. And a center knife mechanism 50 as a moving knife mechanism for forming a cut S at each end, and a linear cut S (hereinafter also referred to as a straight cut S), respectively. Re includes 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.

  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. 4 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. 10, a needle bar holder 44 that simultaneously holds the two needle bars 42, a sewing machine spindle motor 45 as a sewing machine motor serving as a drive source for the sewing needle vertical movement, and a sewing machine spindle motor 45 (FIG. 10). ), A rotating spindle 47 that is fixedly connected to one end portion of the sewing machine spindle 46 and that rotates, and one end portion is connected to a position eccentric from the rotation center of the rotating weight 47 and the other end. And a crank rod 48 connected to a needle bar holder 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 the needle bars 42, 42, and holding and holding the needle bars 42 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 42 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 the needle switching solenoid 43, both the needle bars 42, 42 are held by the latch mechanism, one needle bar 42 is held by the latch mechanism, and the other needle bar 42 is held by the holding mechanism, It is possible to switch between the state in which one needle bar 42 is held by the holding mechanism and the other needle bar 42 is held by the latch mechanism. In any state, the needle bar held by the needle bar holder 44 is The needle bar that moves up and down and is held by the latch mechanism stops near the top dead center.
When performing slant-shaped bead stitching, the three holding states are switched at a predetermined timing to form a deviation in the cloth feed direction at the front and rear ends of the left and right straight stitches TL and TR. It is possible to do.

  The needle bars 42 and 42 hold the sewing needles 41 and 41 so that their positions can be adjusted along the Y-axis direction. Thereby, the interval in the Y-axis direction of the above-described straight stitches TL and TR can be adjusted. Such adjustment is normally performed so that each of the straight seams TL and TR is equidistant from the straight cut S.

(Center knife mechanism)
FIG. 5 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 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. 5). 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 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. 6 is a perspective view of each corner knife mechanism 100A, 100B, FIG. 7 is an enlarged perspective view showing the equipped state of each corner knife 101-104, and FIG. 8 is an explanation showing the selection operation of the corner knife 101-104 that moves up and down. FIG. In addition, in FIG. 6, each corner knife mechanism 100A, 100B has shown the state which removed two of the four corner knife 101-104.
Each of the corner knife mechanisms 100A and 100B is disposed below the sewing machine table 11 and on the passage path of the large pressers 21 and 21 by the large presser feeding mechanism 20 and in front of the center knife 51 in the cloth feeding direction. In addition, a substantially V-shaped cut is formed at the positions corresponding to both ends of the straight cut S by penetrating the ball cloth B and the body cloth M conveyed by the large press feed mechanism 20 with a pair of corner knives from below. .
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 pair of diagonal cuts on the rear end side of the straight cut S, and the other corner knife mechanism 100B forms a pair of diagonal cuts on the front end side of the straight cut S. belongs to. 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 100 </ b> B includes four corner knife 101, 102, 103, 104, a unit main body 105 supported by a pair of round bar-shaped guide shafts 14 disposed on the lower surface side of the table 11, An index 106, which is a block-shaped structure that is supported so as to be movable in the Y-axis direction in the recess 105a formed on the rear side surface and holds the corner knives 101 to 104, and the index 106 in the Y-axis direction. An index moving mechanism 120 serving as a selection mechanism for a corner knife that moves and positions along with the index knife and a vertical movement mechanism 130 that selects and moves the corner knife up and down in cooperation with the index moving mechanism 120 are provided.

  The unit main body 105 has a frame shape and is supported in a state where the pair of guide shafts 14 are inserted at one end 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 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 adjusts the angle of each corner knife 101 to 104 around the Z axis by loosening a fastening screw (not shown) (see FIG. 9A) and the inclination angle to which the tooth tip is directed. It can be adjusted manually (see FIG. 9B). For each corner knife 101-104, the inclination angle of the oblique cut with respect to the straight cut S is determined by adjusting the angle around the Z axis, and the cutting length of the oblique cut is determined by adjusting the inclination angle to which the tooth tip is directed.
Here, the example of adjustment of each corner knife 101-104 seen from upper direction is demonstrated based on FIG. 8 (B). The two right corner knives 101 and 102 are for forming oblique cuts formed on the right side with respect to the straight cut S, and each of them is inclined in a direction toward the right side toward the front. The corner knife 102 is inclined so that the cutting length of the oblique cut becomes longer. Further, the widths h1 and h2 in the Y-axis direction of the oblique cuts 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 diagonal 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 cutting length of the oblique cut becomes longer. Further, as in the case of each corner knife 101, 102, the widths h1 and h2 in the Y-axis direction of the oblique cut formed by each corner knife 103, 104 are adjusted to be equal. That is, the corner knives 101 and 103 correspond to “short knives”, and the corner knives 102 and 104 correspond to “long knives”.

  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 positioning motor 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 the screw shaft 122 via a ball screw. And a moving body 123.
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 oblique cut by the corner knife in the Y-axis direction.

  The vertical movement mechanism 130 raises the corner knife to form a diagonal cut on the left side of the straight cut S and the first air cylinder 131 that raises the corner knife to form a diagonal cut on the right side of the straight cut S. A second air cylinder 132 and cylinder brackets 133 and 134 as engagement members provided on the output shafts of the air cylinders 131 and 132 and selectively engageable with the lifting brackets 107a to 110a described above are provided. Yes.

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, 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, and the lifting bracket 109a of the corner knife 103 is engaged with the cylinder bracket 134. When in the position, (2) When the lifting bracket 108a of 102 is in a position where it engages with the cylinder bracket 133, (3) When the lifting bracket 110a of the corner knife 104 is in a position where it engages with the cylinder bracket 134 The optical index sensor 111 (see FIG. 10) that detects the presence of the three positions is provided, and the positioning of the index 106 is controlled by such sensor detection. These states (1) to (3) are referred to as states where the corner knives 101 to 104 are in the operating positions.

  Note that the overlapping range of the cylinder brackets 133 and 134 and the lifting brackets 107a to 110a has some width 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 an electromagnetic valve 70 of the air cylinder 65 that switches between the operating state and the driving state of the sewing machine spindle motor 45, the presser motor 23, the knife motor 57, the unit moving motor 90, and the center knife that are the objects of the control. Are connected via drivers 45a, 23a, 57a, 90a and 70a, respectively.
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 index motor 121 and 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 index sensor 111 described above are drivers 121a, 135a and 136a, and an input circuit 111a. Connected through.
Further, a potential valve 89 for driving a knife driving cylinder (not shown) for driving a knife for cutting a sewing thread and the needle switching solenoid 43 described above are connected to the operation control means 80 through drivers 70a and 43a. Yes.
Although two corner knife mechanisms are provided, in FIG. 10, the configuration relating to the corner knife mechanism shows the internal configuration of only one corner knife mechanism 100B, and the other corner knife mechanism 100A is shown. Is shown with the internal configuration omitted.

  The operation control means 80 includes a CPU 81 that performs various processes and controls, a setting input program 82a that performs input processing of various settings of the edge stitch sewing machine 10, and a first cutting control that executes operation control of the sewing machine in the edge stitch. A ROM 82 in which a program 82b, a second cutting control program 82c and a center cut formation control program 82d are written, a RAM 83 as a work area for storing various data in the processing of the CPU 81, sewing data and various setting data And an EEPROM 71 for recording.

(Setting input program)
When executing the ball stitching, the front end positions PFL and PFR and the rear end positions PRL and PRR (see FIG. 2) of the left and right straight stitches TL and TR in the cloth feeding direction F are previously set, and two straight lines are used. Whether the end portion XS of the straight cut S in the X-axis direction by the center knife 51 with respect to the ends of the seams TL and TR and the formation of the corner cut are performed by the first cutting control or the second cutting control described later. The selection setting and the feed amount settings of the fabrics B and M by the large pressers 21 and 21 for each stitch are set and input by the display input means 85 and stored in the EEPROM 71.

The edge stitch sewing machine 10 is provided with a marking light (not shown) that irradiates a fixed position of the table when setting the body cloth M or the ball cloth B to be sewn. By setting the sewing start position and sewing end position of the M and the ball cloth B together, it is possible to sew them to the predetermined positions.
As described above, the ball edge sewing machine 10 performs the cloth feed operation control on the assumption that the body cloth M and the ball cloth B to be sewn are set at the correct predetermined positions. In other words, if the body cloth M or the ball cloth B is set at a predetermined position, the amount of movement of the large pressers 21 and 21 is determined according to the preset “of the left and right straight stitches TL and TR in the cloth feed direction F”. Since the front end position PFL, PFR and the rear end position PRL, PRR "can be seen to be directly below the sewing needles 41, 41, the body cloth M or ball fed from the large pressers 21, 21 is accordingly determined. Control is performed on the cloth B to measure the timing of the start and end of sewing of the straight seams TL and TR.
Therefore, when the CPU 81 receives the front end positions PFL, PFR and the rear end positions PRL, PRR of the left and right straight stitches TL, TR in the cloth feed direction F from the display input means 85 according to the setting input program 82a, A process of storing the value in the EEPROM 71 is executed.

  Further, the CPU 81 subtracts PFR from PFL from the front end positions PFL, PFR and rear end positions PRL, PRR of the left and right straight stitches TL, TR in the cloth feed direction F according to the setting input program 82a. The rear end position deviation CR is calculated by subtracting the part position deviation CF from the PRL and PRR, and is stored in the EEPROM 71.

In addition, when the CPU 81 receives information specifying the front end position FE and the rear end position RE (see FIGS. 1 and 2) of the straight line break S from the display input unit 85 according to the setting input program 82a, The value is stored in the EEPROM 71. FIG. 11 is an explanatory diagram showing an example of determining the front end position FE of the straight cut S when performing the edge stitching shown in FIG.
As described above, the angle adjustment of each corner knife 101-104 around the Z axis (see FIG. 9A) and the inclination angle of the tooth tip (see FIG. 9B) are adjusted manually. Therefore, in order for the motion control means 80 to determine the cloth feed direction (X direction) end position of the straight cut S relative to the end positions of the straight stitches TL and TR, And the inclination angle to which the tooth tip is directed are adjusted, and the front end position FE (also referred to as the front end position FE) or the rear end position RE (rear end) of the straight cut S is set by the setting input program 82a. It is necessary to input information specifying the component position RE).

  For example, with respect to the diagonal cuts (VFL and VFR) on both the left and right sides across the straight cut S as shown in FIG. 2, the two cutting blades 101 and 103, which are both short knifes, have the same cut length (CLS). However, in preparation for the case of performing the edge stitch by the first cutting control in which the diagonal cut is formed by the arrangement in which one end of each diagonal cut coincides with the corresponding straight stitch, the operator actually sets the straight cut. While forming the stitches TL and TR, the angle adjustment around the Z axis and the inclination angle (θ1) to which the tooth tip is directed are adjusted equally for each of the corner knives 101 and 103, and a desired corner cut is formed. In addition, the cloth feed direction length XS of the diagonal cut VFR is input as information for specifying the front end position FE of the straight cut S. Next, the operation control means 80 stores the cloth feed direction length XS in the EEPROM 71 in accordance with the setting input program 82a. Although illustration is omitted, for the rear end portion RE of the straight cut, the length in the cloth feed direction of the oblique cut VRL is similarly input as information for specifying the rear end portion position RE. In this case, the EEPROM 71 functions as a storage unit that stores the cloth feed direction length XS of the cut length of the oblique cut formed by the corner knife 101 or the corner knife 103 which is a short knife.

The cloth feed direction length XS is obtained by executing the center cut formation control program 82d by the CPU 81 when, for example, performing edge stitching by the first cutting control as shown in FIG. The non-extending side of the straight seam TR from the end PFR of one straight seam TR, which is further extended in the straight seams TL, TR, by the length XS (the length of the cutting length by the short knife in the cloth feed direction). This is used when specifying the position FE closer to the front end portion of the straight line break S.
Further, the cloth feed direction length XS is obtained by executing, for example, the center cut formation control program 82d when the CPU 81 executes the edge stitch sewing by the second cutting control as shown in FIG. A position closer to the non-extending side of the straight seam TL than the end of the straight seam TL that is not extended more than the straight seam TL, TR by a length XS (length of the cutting length by the short knife in the cloth feed direction). It is used when FE is specified as the front end position of the straight line break S.

  In this case, as shown in FIGS. 11 and 12, the front end position FE of the straight cut S is unambiguous with reference to the end position PFR of the seam extended from the two straight seams TL and TR. Therefore, the first cutting control and the second cutting control have different values of XS and XL, respectively, and XL changes depending on the inclination angle θ2 of the long knife. When the end position FE of the straight line break S is specified, a very troublesome input operation is required.

However, when the CPU 81 executes the center cut formation control program 82d, it is selected so that the front end position FE of the straight cut S can be determined based only on the cloth feed direction length XS of the cutting length of the short knife. Since the reference position is automatically changed according to the cutting control program and the front end position FE of the straight cut S is specified, the operator simply inputs the cloth feed direction length XS of the cutting length by the short knife. Can be used to set the front end position FE of the straight cut S, and the front end position FE of the straight cut S can be changed at the time of switching between the first and second cutting control or when the inclination angle θ2 of the long knife is readjusted. It is possible to reduce the work burden of having to input further information (XL) to be specified.
11 and 12 are explanatory diagrams when the front end position FE of the straight cut S is specified, but the rear end position RE of the straight cut S is similarly cut with a corresponding knife with a short knife. It can be specified simply by inputting the feed direction length.

  In addition, “selection setting of whether to perform by the first cutting control or the second cutting control” is which of the first cutting control program 82b and the second cutting control program 82c is executed when the corner cut is formed. Is set by the operation of the display input means 85 by the operator.

  The “feed amount setting of the fabrics B and M by the large pressers 21 and 21 for each stitch” is a so-called fabric feed speed. That is, the large presser feed mechanism 20 can perform sewing at a constant pitch by controlling the large presser 21 to move by a predetermined feed amount for each stitch in synchronization with the vertical movement speed of the sewing needle. In addition, since the operation timing is determined on the assumption that the large presser 21 moves by a predetermined feed amount for each stitch in the formation control of the other straight breaks S and corner breaks, the movement amount for each stitch is set in advance. There is a need to. At the time of controlling the operation of the ball stitching, which position (position in the cloth feeding direction) the fabrics M and B is based on the elapsed time from the start of the operation with reference to the movement amount for each stitch stored in the EEPROM 71. And various operation controls are executed.

  “Amount of movement of the corner knife mechanism 100B with respect to the corner knife mechanism 100A when forming the corner cut” is the distance between the corner knife mechanism 100A and the corner knife mechanism 100B when the corner cut is formed at the front and rear ends of the straight stitches TL and TR. Distance. That is, when the fabrics M and B are conveyed to the arrangement of the corner knife mechanisms 100A and 100B, the corner knife mechanism 100A and the corner knife mechanism 100B are separated according to the length of the straight stitches TL and TR. In this way, the unit moving motor 90 is driven, thereby enabling the formation of corner breaks at the front and rear ends of the straight stitches TL and TR simultaneously. For example, a value that matches the length of the straight line break S is set.

(Corner cut formation control for ball stitching: first cutting control)
The corner cut formation control of the edge stitches is performed by the first cutting control program 82b and the second cutting control program 82c stored in the ROM 82. That is, by executing these programs 82b and 82c, the CPU 81 functions as an oblique cut formation control means. The first cutting control program 82b is applied to the presser motor 23 of the large presser feed mechanism 20 and the corner knife mechanisms 100A and 100B. In order to form the corner cut shown in FIG. 2, the oblique cuts VFL, VFR (or VRL, VRR) on both the left and right sides across the straight cut S are made equal to each other while the respective cut lengths VFL, VFR, This is a program for causing the CPU 81 to perform the first cutting control for forming a corner cut in an arrangement in which one end of VFR (VRL, VRR) is matched with the end of the corresponding straight stitch TL, TR.
On the other hand, the second cutting control program 82c sandwiches the straight cut S in order to form the corner cut shown in FIG. 3 for the presser motor 23 of the large presser feed mechanism 20 and the corner knife mechanisms 100A and 100B. For the diagonal cuts VFL, VFR (or VRL, VRR) on both the left and right sides, the cut lengths of the respective diagonal cuts VFL, VFR (VRL, VRR) are made different from each other, and the corresponding straight seam ends TL, TR And a program for causing the CPU 81 to perform second cutting control for forming a corner cut in an arrangement that matches the end of the straight cut S.
The first and second cutting control programs 82b and 82c are executed by the CPU 81 according to the selection by the operator selecting and setting which one is executed by the display input means 85 as the selection means. Hereinafter, the first and second cutting controls will be described in detail.

In forming the corner cut, the corner knife mechanism 100B is used for forming the corner cut on the front end side, and the corner knife mechanism 100A is used for forming the corner cut on the rear end side. Here, a description will be given by taking as an example the formation of a corner break on the front end side.
In the first cutting control, the corner knife 101 and 103 of the corner knife mechanism 100B are used. That is, when the front end position PFR of the straight stitches TR of the fabrics M and B reaches the corner knife mechanism 100B by the large press feed mechanism 20, the CPU 81 first raises the corner knife 101 to form the oblique cut VFR. Next, when the end portion position deviation CF is fed by the large pressing mechanism 20, the corner knife 103 is raised to form an oblique cut VFL.
In addition, the corner knife mechanism 100B is previously arranged at a predetermined distance from the corner knife mechanism 100A by the unit moving motor 90, and the corner knife mechanisms 100A and 100B simultaneously perform cutting.

In the second cutting control, the corner knives 102 and 103 of the corner knives mechanism 100B are used (if the edge position deviation is set so that the oblique cut VFR is behind the VFL, the corner knives 101 and 104 are used. Is used). In other words, when the front end position PFR of the straight seam TR of the fabrics M and B reaches the corner knife mechanism 100B by the large press feed mechanism 20, the CPU 81 raises the corner knife 101 and 104 to form the diagonal cuts VFR and VFL. To do. That is, the oblique cuts VFR and VFL are formed without any feeding operation since the end positions in the X-axis direction on the straight cut S side coincide.
The first point is that the corner knife mechanism 100B is placed at a predetermined distance from the corner knife mechanism 100A in advance by the unit moving motor 90, and the corner knife mechanisms 100A and 100B simultaneously perform cutting. This is the same as the cutting control.

(Center cut formation control for ball stitching)
The center cut formation control of the edge stitches is performed by a center cut formation control program 82d stored in the ROM 82. That is, by executing the center cut formation control program 82d, the CPU 81 functions as a center cut formation control means.
That is, the CPU 81 executes the center cut formation control program 82d to determine which of the first cut control and the second cut control is selected in the corner cut formation control, and selects the first cut control. Sometimes the end position of the straight line is specified based on the end of the straight seam that is extended, and the end of the straight line is determined based on the end of the straight seam that is not extended when the second cutting control is selected. The control which specifies a position is executed.

  Here, “extended” means a straight seam that extends further forward on the front end side (the straight seam TR in FIGS. 2 and 3), and further rearward on the rear end side. The extending straight seam is shown (the straight seam TL in FIGS. 2 and 3). Here, the front end side will be described as an example.

As shown in FIGS. 11 and 12, when the corner knife mechanism 100B performs the first cutting control and the second cutting control using two types of long and short corner knifes, the cloth with the cutting length by the corner knife 102 (long knife) is used. It is assumed that the difference between the feed direction length XL and the cloth feed direction length XS of the cutting length by the corner knife 103 (short knife) coincides with the end position deviation CF (CF = XL−XS). That is, in the second cutting control, from the end portion PFR (see FIG. 2) of the extended straight seam, the length of the cutting length by the corner knife 102 and the position closer to the non-extending side by the length XL. As shown in FIG. 12, the position near the non-extending side by the length XS of the cloth feeding direction of the cutting length by the corner knife 103 from the end portion PFL (see FIG. 2) of the straight seam that is not extended is the front end. In the case of forming a straight cut corresponding to the second cutting control, the front end position FE is matched with the end of the extended straight seam and the straight line not extended. It is possible to specify any end of the seam as a reference.
If both the first cutting control and the second cutting control are performed, when the end position of the straight cut is specified based on the extended straight stitch end PFR, the first cutting control is performed. When the selection is switched from the control to the second cutting control (or vice versa), the distance from the end of the straight stitch to the end of the straight cut is changed from the length XS to the length XL (or vice versa). ) It will be necessary to set again.
However, by executing the center cut formation control program 82d, the CPU 81 is based on the end portion PFR of the straight seam TR that is extended during the first cutting control, and is not extended during the second cutting control. By using the end portion PFL of the straight seam TL as a reference, in any case, the end position of the straight cut can be specified based on the cloth feed direction length XS of the cutting length by the corner knife 103. Accordingly, when switching between the first and second cutting controls, the distance difference between the end portion PFR of the straight seam TR and the end portion PFL of the straight seam TL is changed from the length XS to the length XL (or vice versa). It is possible to reduce the work burden of performing the resetting. Further, in response to the set value of the end position deviation CF (or RF), the operator adjusts the angle of the corner knife 102 (or corner knife 104) about the Z axis and the inclination angle (θ2) to which the tooth tip is directed. In this case, it is not necessary to input the length XL corresponding to the changed tilt angle (θ2), and the work load is further reduced.

(Ball stitching operation control)
The operation control of the edge stitching will be described with reference to the flowcharts of FIGS. The processes according to these flowcharts are processes performed by the CPU 81 by executing the various programs 82a to 82d.
FIG. 13 is a flowchart showing the overall flow of the operation control of the edge stitch, FIG. 14 is a flowchart showing the control of the setting operation in the operation control of the bead stitch), and FIG. 15 is a sewing operation ( FIG. 16 is a flowchart showing a process for creating data required for sewing of the edge stitch, and FIG. 17 is a control of the sewing end operation (corner cut formation) of the edge stitch. It is a flowchart to show.

First, the overall flow of the sewing operation will be described with reference to FIG.
When the sewing is started, first, the setting operation processing of the body cloth M and the ball cloth B is performed (step S20), and then the formation operation control of the straight stitches TL and TR and the straight cut S is performed (step S50). Finally, corner cut forming operation control is performed as a sewing end operation process (step S70), and a series of edge stitches is completed. The processes in steps S20 to S70 are repeatedly executed, whereby the plurality of body cloths and the ball cloth B are sewn.

Next, processing of the set operation in the sewing operation will be described with reference to FIG.
First, the presser motor 23 is driven to move the large presser 21 from the origin position to a predetermined sewing start position (step S21).
Next, the marking light W on the upper surface of the table 11 is irradiated, the cloth M is set in accordance with the reference position indicated by the irradiation position, and when the ball cloth B is set on the large presser 21, the large presser 21 is lowered. Then, the body cloth M is held by the large presser 21 (step S22). Further, the binder 30 is lowered between the large pressers 21 and 21 (step S23). At this time, the corner knife mechanism 100B moves to a predetermined origin position and stands by (step S24).
Further, each large presser 21 is provided with a folding plate for folding both sides of the ball cloth B to the upper surface side of the binder 30, which is moved inward by driving of the air cylinder, and the ball cloth B is moved to the binder 30. (Step S25).
Further, when the flap cloth is sewn on the upper surface of the ball cloth T, the flap cloth is set, and then the cloth pressing mechanism is operated so as to press the flap cloth (step S26).
Thereby, the set operation is completed. Note that the sewing of the flap cloth is not essential and may not be performed.

Next, control of the sewing operation in the sewing operation will be described with reference to FIG.
First, in the control of the sewing operation, a sewing data creation process is executed (step S51).
That is, as shown in FIG. 16, when creating data required for sewing, the amount of movement of the large presser 21 for each stitch, the positions of the front end positions PFL, PFR and the rear end positions PRL, PRR of the straight stitches TL, TR, When the cloth feed length XS of the cutting length of the corner knife 101, 103 which is a short knife is set or inputted, these are stored in the EEPROM 71 (step S11), and then the amount of movement of the corner knife mechanism 100B with respect to the corner knife mechanism 100A Is set, it is similarly stored in the EEPROM 71 (step S12).
Further, when a selection setting for executing one of the first cutting control and the second cutting control as the corner cut setting is input, the selection result is recorded in the EEPROM 71 and it is determined which selection it is. Is performed (step S13).
When the first cutting control is selected, the front end portion or the rear end portion position of the straight cut S based on the front end portion PFR of the extended straight seam TR or the rear end portion PRL of the straight seam TL. Is set (step S14).
Further, when the second cutting control is selected, the position of the front end or rear end of the straight cut S based on the front end PFL of the straight seam TL that is not extended or the rear end PRR of the straight seam TR Is set (step S15).
The front end position and the rear end position of the straight line break S are recorded in the EEPROM 71.

Next, the large presser 21 starts to move, and the position of the front end portion of the straight seam TR in the fabrics M and B is conveyed below the sewing needle 41 (step S52). At such time, the sewing machine spindle motor 88 starts to drive and formation of the seam is started (step S53). Initially, the formation of the straight seam TR precedes with the right needle, and when the fabrics M and B are conveyed by the end position deviation CF, the two needles are switched to start the formation of the straight seam TL.
Further, the number of stitches is counted from the start of driving of the sewing machine spindle motor 45, and it is determined whether the number of stitches until the sewing is completed is reached (step S54). If the number of stitches has reached the completion number, the sewing is finished.
If not, the pressing motor 45 is driven according to the set feed amount of the large pressings 21 and 21 for each stitch (step S55).
Next, it is determined from the accumulated rotation amount of the presser motor 45 whether or not the center knife lowering position (front end of the straight line break S) determined based on the end position reference of the stitch end has been reached (step S56). In this case, the center knife 51 is lowered and moved up and down, and the formation of the straight line break S is started (step S57). On the other hand, if it is determined in step S56 that the straight cut S has already been formed past the lower position of the center knife, the process proceeds to step S58.
Next, it is determined from the accumulated rotation amount of the presser motor 45 whether the center knife ascending position (rear end portion of the straight cut S) determined based on the end position reference of the stitch end has been reached (step S58). In this case, the rising and vertical movement of the center knife 51 are stopped, and the formation of the straight cut S is completed (step S59). On the other hand, if it is determined in step S56 that the straight cut S has already been formed past the lower position of the center knife, the process proceeds to step S58. Thereafter, the process is returned to step S54, and it is determined whether or not the rear end position of each straight stitch TL, TR has been reached. And when it reaches | attains, the formation operation | movement of the straight seams TL and TR and the straight cut S is complete | finished.

Next, the control of the sewing end operation in the sewing operation will be described with reference to FIG.
With the completion of the operations for forming the straight stitches TL and TR and the straight cut S, the corner knife mechanism 100B is moved to a predetermined position in accordance with a preset movement amount (step S71).
Next, it is determined whether the selection setting of whether to form the corner cut by the first cutting control or the second cutting control is any (step S72).
And when setting is the 1st cutting control, processing of Steps S73-75 is performed. That is, in each corner knife mechanism 100A, 100B, the corner knife, which is a short knife, is pushed up with respect to the straight seam TR side (step S73), and then the end position deviations CF, CR are moved by the pressing motor 23. (Step S74), the corner knife, which is a short knife on the straight seam TL side, is pushed up, and the formation of the corner cut is completed (Step S75).
Further, when the setting is the second cutting control, the processes of steps S76 to S78 are executed.
That is, in each corner knife mechanism 100A, 100B, a corner knife as a short knife is pushed up at each end before and after the straight cut S (step S76), and the index is moved to switch the corner knife. (Step S77) The corner knife, which is a long knife, is pushed up at the end portions before and after the straight line break S, and the formation of the corner break is completed (Step S78).

(Effect of embodiment)
In the case of the edge stitch sewing machine 10 according to the embodiment, when the end position deviations CF and CR are provided at either end of the two straight stitches TL and TR, the left and right oblique cuts having the same cutting length are provided. The first cutting control for forming diagonal cuts in an arrangement that matches the ends of each straight seam, and the left and right diagonal cuts with different cutting lengths corresponding to the end position deviations, It is possible to select and execute the second cutting control for forming each oblique cut in an arrangement that matches the end of the seam and the end of the straight cut.
For this reason, in the case of ball stitching, when the end position deviation can be changed and the speed of work is required, the first cutting control is selected, and when high sewing quality is required. By selecting the second cutting control, it is possible to perform appropriate edge stitching according to various requirements and work situations.

(Other)
In the second cutting control, the control for changing the cutting length may be performed by switching the short knife and the long knife or by changing the cutting length by moving the same knife.
Further, the cutting length and the inclination angle of each corner knife 101-104 are provided in accordance with the setting input program 71a by providing a motor for adjusting the rotation of each corner knife about the Z axis and a motor for adjusting the rotation of the corner knife about the horizontal axis. It is good also as a structure which can be adjusted automatically according to the cutting length and inclination angle of a cut | interruption.
Moreover, in the said embodiment, although the inclination angle of each corner knife 101-104 is adjusted each time, the cloth feed length of the cutting length of the short knife 101 (or 103) is directly input, The knife 81 is fixedly attached, the inclination angle (θ1) is stored in the EEPROM 71, and the interval NW (see FIGS. 11 and 12) between the two sewing needles is input so that the CPU 81 can cut the cutting length with the short knife. The length XS obtained by calculating the cloth feeding direction length XS as XS = NW / 2 tan θ1 may be stored in the EEPROM 71.

It is a perspective view which shows the schematic structure of the whole edge stitch sewing machine. It is explanatory drawing which shows the relationship of the arrangement | positioning of the seam by the straight cut by the center knife, the cut by the corner knife, and the two needles in the bead stitch which forms the diagonal pocket opening by the first cutting control. It is explanatory drawing which shows the relationship of the arrangement | positioning of the seam by the straight cut by the center knife, the cut by the corner knife, and the stitch by two needles in the bead stitch which forms the pocket opening part of an oblique shape by the second cutting control. 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. 8A is an explanatory view showing the selection operation of the corner knife that moves up and down, FIG. 8B is an explanatory view showing an adjustment example of each corner knife, and FIG. 8C is the relationship of the lifting bracket with respect to the cylinder bracket. It is explanatory drawing which shows a combined state. FIG. 9A shows an angle adjustment state of each corner knife around the Z axis, and FIG. 9B is an explanatory diagram showing a cutting length adjustment state. It is a block diagram which shows the control system containing the operation control means of a bead stitch sewing machine. It is explanatory drawing which shows the example which determines the cutting length and angle of a diagonal cut in the case of performing the edge stitch shown in FIG. It is explanatory drawing which shows the example which determines the cutting length and angle of a diagonal cut in the case of performing the edge stitch shown in FIG. It is a flowchart which shows the whole flow of operation | movement control of a bead stitch. It is a flowchart which shows control of the setting operation | movement in the operation control of a bead stitch. It is a flowchart which shows control of the sewing operation | movement (stitch and linear cut formation operation | movement) in the operation control of a bead stitch. It is a flowchart which shows the process at the time of the data preparation required for sewing of a bead stitch. It is a flowchart which shows control of the sewing end operation | movement (corner cut formation) of a bead stitch. FIGS. 18A and 18B are state explanatory views showing problems of the prior art.

Explanation of symbols

20 Large presser feed mechanism (cloth feed mechanism)
41 Sewing needle 45 Sewing spindle motor (sewing motor)
50 Center knife mechanism (moving knife mechanism)
81 ROM
82b 1st cutting control program 82c 2nd cutting control program 82d Center cut formation control program 100A, 100B Corner knife mechanism B Ball cloth CF, CR End position deviation M Body cloth TL, TR Straight stitch S Straight cut VFL, VFR , VRL, VRR diagonal cut

Claims (2)

A cloth feed mechanism that holds and conveys the fabric and the ball cloth;
A needle up-and-down movement mechanism that moves up and down two sewing needles that form two straight stitches parallel to the cloth feed direction and the cloth feed direction;
A moving knife mechanism that forms a straight cut along the cloth feed direction between the two straight stitches;
A corner knife mechanism capable of forming an oblique cut between an end of the two straight stitches and an end of the straight cut;
At least one of the front and rear end portions in the cloth feed direction of each of the straight stitches and the straight cut, the end position deviation is provided so that the end positions of the two straight stitches are different from each other in the cloth feed direction. In addition, the diagonal cut formation control for controlling each of the mechanisms so that the diagonal cut is formed from two diagonal cuts formed along the direction from the end portions of the two straight stitches toward the linear cut. Means,
In the hem sewing machine with
The corner knife mechanism is provided corresponding to each of the front and rear ends of the straight cut,
The oblique cut formation control means, for the corner knife mechanism corresponding to the end portion provided with the end position deviation,
For the diagonal cuts on both the left and right sides across the straight cut, the diagonal cuts are formed in an arrangement in which one of the diagonal cuts is made to coincide with the end of the corresponding straight stitch while making the cut lengths equal to each other. Cutting control,
With respect to the diagonal cuts on the left and right sides across the straight cuts, the respective cut lengths are made different, and the respective diagonal cuts are arranged so that both ends of the respective diagonal cuts coincide with the corresponding straight stitch ends and the straight cut ends. A second cutting control for forming a cut,
A bead-stitch sewing machine that is selectively executed. The corner knife mechanism includes a long knife for forming a diagonal cut with a long cutting length and a short knife for forming a short diagonal cut, and the diagonal cuts on both the left and right sides in the first cutting control are both formed with a short knife. In addition, the diagonal cuts on the left and right sides in the second cutting control are formed by a combination of a short knife and a long knife,
Storage means for storing the length in the cloth feed direction of the cutting length by the short knife;
When the diagonal cut formation control unit selects the first cutting control, the length of the cutting length by the short knife from the end of one of the two straight seams extending in the cloth feed direction When the oblique cut formation control means selects the second cutting control, the position closer to the non-extending side by the amount corresponding to the non-extending side is the other end of the two that is not extended. The cloth feed mechanism and the cloth feed mechanism so as to form the straight cut from the end of the straight seam as the end position of the straight cut by a position closer to the non-extension side by the length of the cloth feed direction of the cutting length by the short knife. The edge stitch sewing machine according to claim 1, further comprising center cut formation control means for controlling a moving knife mechanism.

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