JP4769505B2 - Sewing sewing machine - Google Patents

Description

  The present invention relates to an edge stitch sewing machine for performing an edge stitch.

The bead stitch sewing machine is a sewing machine suitable for forming a pocket by sewing a bead cloth on a garment body cloth and forming a predetermined cut in the garment cloth and the bead cloth (for example, (See Patent Document 1).
That is, in sewing with the ball stitch sewing machine, on the upper surface of the needle plate, the body cloth and the ball brim cloth are arranged so as to overlap with each other, and the bottom plate portion and the vertical plate portion erected perpendicularly to the upper surface from above. A binder having a T-shaped cross section composed of Furthermore, both ends of the ball edge cloth are held in a state of being folded back from the upper surface of the bottom plate portion of the binder along each plane of the upright plate portion, and each fabric is fed in a predetermined direction by the feed mechanism, while Sewing with two needles on both sides of the plate. Then, the center knife is moved up and down in synchronization with the vertical movement of the sewing needle to form a linear center cut, and then the corner knife arranged in a V shape is moved up and down to both ends of the center cut. In this way, a substantially V-shaped corner cut that bifurcates is formed and sewed to form a pocket.
Japanese Patent Publication No. 1-38517

However, in the bead cloth folding device provided in the conventional bead stitch sewing machine as disclosed in the above-mentioned Patent Document 1, as shown in FIG. 9, the ball is placed along the upper surface of the bottom plate portion 201 a of the binder 201. As shown in FIG. 10, when the folding plate 202 for folding the edge fabric is horizontally oriented and moved horizontally, the installation height and the operation direction are constant and the thickness of the ball edge fabric is equal to or greater than the assumed thickness. In addition, due to the thickness and rigidity of the fabric, the folding plate 202 may stop halfway and the folding operation may be interrupted.
Further, in order to cope with such a problem, the rubber 203 to be attached to the lower surface of the large presser device 200 incorporating the folding plate 202 is replaced with one having a thickness corresponding to a thick ball cloth (hereinafter referred to as a thick cloth). When the folding plate 202 is operated, a method of folding a thick ball cloth so that the lower surface of the folding plate 202 moves higher than the upper surface of the thick fabric folded along the upper surface of the bottom plate portion 201a is taken. However, in actual rim stitching, the thickness of the rim fabric often changes with each sewing lot, and a thin rim fabric with a rubber 203 for folding a thick rim fabric is applied. In the case of folding, an extra gap is formed between the folding plate 202 and the ball cloth as shown in FIG. 11, and there is a problem that the amount of folding becomes unstable due to loosening of the fabric. .
For this reason, it is necessary to select and replace the rubber 203 having an appropriate thickness with respect to the cloth thickness in order to cope with the change in the cloth thickness of the ball edge cloth and to stabilize the folding amount. There was a problem that the operating rate of the apparatus was lowered by the replacement work.

  Therefore, an object of the present invention is to provide an edge stitch sewing machine capable of performing a smooth folding operation of an edge cloth regardless of a change in the cloth thickness.

In order to solve the above-mentioned problems, an invention according to claim 1 has a bottom plate portion and a standing plate portion erected perpendicularly to the bottom plate portion, and is placed on the cloth on the bottom plate portion and the standing plate portion. A binder that guides the stitched cloth along the placed ball edge cloth and a pair of folding plates disposed on both sides of the upright plate portion of the binder and above the bottom plate portion. The folding plates are moved closer to the upright plate portion by the driving means, and the end portions of the folding plates extend from both the left and right ends of the bottom plate portion to the both ends of the edge cloth. In the edge stitch sewing machine provided with a folding device that folds up to the upper surface side and folds the ball cloth, the folding device individually supports each folding plate so that the tip of each folding plate can move up and down. a pair of support members, a biasing member for biasing the always lower side the leading end of the folding plates A welting sewing machine, characterized in that it comprises.

  According to a second aspect of the present invention, in the edge stitch sewing machine according to the first aspect, the folding device is configured to fold each of the pair of folding plates when the pair of folding plates are moved closer to each other by the driving means to fold the ball cloth. The folding plate is positioned such that the edge of the plate is outside the left and right ends of the bottom plate portion, and the bead fabric is positioned at a height equal to or higher than the total thickness when folded so as to sandwich the bottom plate portion from above and below. It is characterized by providing the step part which maintains the height of.

  According to a third aspect of the present invention, in the bead stitch sewing machine according to the first or second aspect, the folding device is configured such that when the pair of folding plates are moved closer to each other by the driving means and the bead cloth is folded. The distal end portion is configured to move obliquely downward toward the upper surface of the bottom plate portion.

According to a fourth aspect of the present invention, in the edge stitch sewing machine according to any one of the first to third aspects, the folding plate is connected to the movable portion of the driving means, and the support member is The driving means is supported so as to be swingable around a rotation fulcrum, and one end side of the urging member is connected to the driving means, the other end side is connected to a large presser, and the leading end portion of each folding plate Is biased downward .

  According to the first aspect of the present invention, each folding plate arranged on both sides of the upright plate portion is supported by the support member in a state in which the front end portion of each folding plate can move up and down. The leading end of each folding plate is always urged downward by the biasing member. As a result, when folding a thick ball edge cloth, the leading edge of the folding plate moves forward while sliding on the upper surface of the ball edge cloth according to the cloth thickness, and the folding operation is executed. Even in the case of folding, the tip of the folding plate urged downward is brought into contact with the upper surface of the ball cloth and slides to execute the folding operation. Therefore, it is possible to realize a smooth folding operation without being influenced by the cloth thickness of the ball cloth to be folded. In addition, since the tip of the folding plate is urged downward, it can be folded while stretching the ball cloth along the upper surface of the binder, and the folding amount can be stabilized without causing slack in the ball cloth. Can be achieved. In addition, it is not necessary to replace parts every time the fabric thickness changes, and the cost can be reduced and the operating rate of the edge stitch sewing machine can be improved.

  According to the second aspect of the present invention, the same effect as that of the first aspect of the invention can be obtained, and in particular, by providing the folding device with the stepped portion, the ball cloth sandwiches the bottom plate portion from above and below. In such a state that the front end portion of the folding plate is positioned above the total thickness when folded, the front end portion of the folding plate is guided to a position just before the position where the end portion of the bottom plate portion overlaps. The Therefore, when the tip of the folding plate comes into contact with the ball cloth during the operation of the folding plate, the movement in the traveling direction is not stopped by the ball cloth, and even the thick ball cloth is smooth. Fold-in operation can be realized. The height maintained by the stepped portion is the total thickness when the ball cloth is folded back so that the bottom plate portion is sandwiched from above and below, but the ball cloth in that case is within the range generally used for sewing. It is desirable to assume the thickest.

  According to the third aspect of the present invention, the same effect as that of the first or second aspect of the invention can be obtained. And it is contact | abutted from diagonally upward with respect to the upper surface of the folded beaded cloth. Accordingly, the entire lower surface of the folding plate is not brought into contact with the upper surface of the folded ball cloth, but only the tip portion thereof is brought into linear contact. As a result, the upper surface of the folded ball cloth can be guided to be stretched to the upright plate portion side, so that the ball cloth can be folded along the upper surface of the binder without causing slack. As a result, the amount of folding can be efficiently stabilized. Moreover, since the folding plate moves obliquely downward, it is possible to cope with the cloth thickness in a range corresponding to the height change due to the movement of the tip portion.

  According to the invention described in claim 4, the same effect as that of any one of the inventions described in claims 1 to 3 can be obtained, and in particular, the folding plate has a base end side of the folding plate. Since it is rotated to the center, the front end portion of the folding plate can be moved up and down with a simple structure.

(Overall configuration of the embodiment of the invention)
Hereinafter, an edge 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 51 described later, and the sewing operation is performed. The work plane is perpendicular to the Z-axis direction, the direction parallel to the work plane and the cloth feeding is performed 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. .

The bead stitch sewing machine 10 sews a bead fabric N (see FIG. 3) to the body fabric M, and has a linear center cut along the feed direction of these fabrics, and substantially at both ends of the center cut. A sewing machine that forms a V-shaped corner cut.
The bead-sewn 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 feed that feeds a cloth made of a body cloth M and a bead cloth N. A large press feed mechanism 20 as a mechanism, a binder 30 that applies the ball cloth N on the upper side of the body fabric M, and a downstream portion of the binder 30 in the vicinity of the downstream side in the cloth feed direction F ( A needle up-and-down movement mechanism that performs needle dropping on both sides of 32 and a center knife 51 that is supported by the sewing machine frame 12 and that is raised between the sewing needles 41 on the downstream side in the cloth feeding direction F of the sewing needles 41. And a moving knife mechanism as a center knife mechanism for forming a center cut in each of the fabrics B and M, and a corner knife 91 is moved up and down to positions at both ends of the center cut to form a substantially V-shaped core. And a corner knife mechanism to form the over cut.
Each part will be described below.

(Sewing table and sewing frame)
The upper surface of the sewing machine table 11 is arranged in parallel to the XY plane and is used in a horizontal state. 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 which will be described later are disposed on the sewing table 11, and a corner knife mechanism is disposed below the sewing table 11.
A needle plate 13 is provided on the sewing machine table 11. Two needles 41, 41 provided at the tip of an arm portion 12c, which will be described later, are provided in two needle holes formed in the needle plate 13, respectively. It is supposed to do a fall. A horizontal hook (not shown) is provided below each needle hole, and the sewing thread inserted into each sewing needle 41, 41 is captured by the corresponding horizontal hook below the needle plate 13, and each horizontal hook is Sewing is performed by being entangled with the lower thread that is fed out from the sewing machine. Further, 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 downstream in the cloth feeding direction F, and the cloth is cut in cooperation with the center knife 51. A fixed knife (not shown) is arranged.

  The sewing machine frame 12 includes a bed portion 12a disposed immediately next to the intermediate position in the longitudinal direction of the sewing machine table 11, a vertical trunk portion 12b erected from the bed portion 12a, and an Y-axis direction from the upper end portion of the vertical trunk portion 12b. The arm portion 12c extends along the arm portion 12c, and main components of a needle up-and-down moving mechanism and a moving knife mechanism, which will be described later, are stored in the arm portion 12c. Further, two needles 41, 41 and a center knife 51 are supported in a suspended manner at the lower end on the distal end side of the arm portion 12c.

(Needle vertical movement mechanism)
The needle up-and-down moving mechanism includes two sewing needles 41 and 41 constituting two needles, and two needle bars 42 and 42 that hold the sewing needles 41 and 41 at the lower ends. Further, although not shown in the present embodiment, the needle up-and-down moving mechanism is not shown in the drawings, a support frame that supports the needle bars 42 and 42 so as to be slidable along the longitudinal direction, and a needle bar holding mechanism that simultaneously holds the two needle bars 42. The sewing machine spindle motor that is the driving source for the sewing needle vertical movement, the sewing machine spindle that is rotationally driven by the sewing machine spindle motor, a rotary weight that is fixedly connected to one end of the sewing machine spindle, and that is rotationally moved, and a position that is eccentric from the rotational center of the rotary weight And a crank rod whose one end is connected to the needle bar holder, and one end connected to the support frame and a rotation driving force applied by a rotation driving source (not shown). It has a moving shaft.
When a rotational driving force of full rotation is applied to the sewing machine main shaft by driving the sewing machine main shaft motor, a moving component along the Z-axis direction is transmitted to the needle bars 42 and 42 via the rotary weight and the crank rod, Each sewing needle 41, 41 reciprocates up and down. The sewing needles 41, 41 positioned at the lower ends of the needle bars 42, 42 are moved in parallel with the sewing direction when a turning force is applied within a predetermined angle range from the rotation shaft, The so-called back tack stitching in which sewing is performed with a short stroke in the reverse direction is possible.

(Moving knife mechanism)
The moving knife mechanism includes a center knife 51 that forms a center cut, a female knife (not shown) that is provided with the center knife 51 at the lower end and is slidably supported along the Z-axis direction in the arm portion 12c. A female motor (not shown), which is a stepping motor serving as a drive source for vertical movement, and an air cylinder (not shown) serving as a drive source for switching the cutting state of the center knife 51 between a cutable state and a cutting restricted state are provided.
The moving knife mechanism switches between the forward position and the backward position of the air cylinder, so that the cutting restriction state in which the rotational driving force of the knife motor is not transmitted to the center knife and the rotational driving force of the knife motor are reciprocated up and down the center knife 51. The center cut is formed in a desired length by switching to a cuttable state in which it is converted into an operation and transmitted.

(Corner knife mechanism)
As shown in FIG. 1, the corner knife mechanism is disposed below the sewing machine table 11 and in the passage of the large pressers 21 and 21 by the large press feed mechanism 20, and has been conveyed by the large press feed mechanism 20. By inserting a corner knife 91 from below into the ball edge cloth N and the body cloth M, a substantially V-shaped corner cut is formed at the positions corresponding to both ends of the center cut.
Such a corner knife mechanism includes two corner knives 91, 91 arranged at intervals along the cloth feeding direction F, a cover member (not shown) that covers each corner knife 91 from the tip side, A vertical movement motor (not shown) that moves the corner knife 91 and the cover member up and down via a predetermined power transmission mechanism is provided.

(binder)
Next, the binder 30 will be described.
As shown in FIG. 1, the binder 30 is disposed in front of the sewing needles 41, 41, and is erected vertically on the upper surface along the longitudinal direction of the bottom plate portion 31 that is a long flat plate and the bottom plate portion 31. And a standing plate portion 32.
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. In use, the air cylinder is lowered by driving to set the needle plate position.
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.
The standing plate portion 32 is a rectangular flat plate as a whole, and is aligned with the bottom plate portion 31 in the longitudinal direction at the intermediate position in the width direction (Y-axis direction) of the bottom plate portion 31 on the upper surface of the bottom plate portion 31. And it is erected vertically. 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.

  Here, when the ball cloth N is set on the upper side of the body cloth M pressed by the large pressers 21 and 21 on the needle plate 13, the binder 30 is placed from above the ball cloth N. The both ends in the width direction (Y-axis direction in FIG. 1) of the edge cloth N extending from the left and right ends of the bottom plate portion 31 are folded back and raised upward from the width direction both ends of the bottom plate portion 31. Both ends of the cloth N in the width direction are respectively held by folding plates 61 and 61 described later (see FIG. 3) so as to be along the side surfaces on both sides of the upright plate portion 32, respectively. That is, it is set as the state where the ball cloth N was put along from the one side surface of the standing plate part 32 to the other side surface through the bottom plate part 31. In this manner, while the ball edge cloth N and the body cloth M are being set around the binder 30, sewing is performed by the two needles 41 and 41 on both sides of the standing plate portion 32. . At this time, a center cut is formed by the vertical movement of the center knife 51.

(Large press feed mechanism)
Next, the large presser feed mechanism 20 will be described.
As shown in FIG. 1 and FIG. 2, the large presser feed mechanism 20 includes a pair of left and right large pressers 21 and 21 that convey a ball edge cloth N and a body cloth M set in a binder 30, and these large pressers 21. , 21, the air cylinder (not shown) for moving the large pressers 21, 21 up and down via the support 22, and the garment cloth N and the body cloth M pressed by the large pressers 21, 21 are supported. A pressing motor (not shown) that moves in the cloth feeding direction F through the body 22 and a folding device 60 that folds the ball cloth N to the upper surface side of the bottom plate portion 31 of the binder 30 are provided.

Each of the large pressers 21 and 21 has a rectangular shape when viewed from above, and each of the large pressers 21 and 21 is supported by the support body 22 with its longitudinal direction being along the X-axis direction. Each of the large pressers 21 and 21 is supported so that the lower surface thereof is parallel to the XY plane, and the upper surface of the large pressers 21 and 21 is formed to be low on the opposite edge side, and has a wedge shape when viewed from the X-axis direction. It has a shape to be exhibited (see FIGS. 2 to 7). And the folding plate 61 of the folding device 60 mentioned later is each mounted on the upper surface of each large presser 21,21, and each folding is carried out toward the binder 30 side along the inclined upper surface of each large presser 21,21. The plates 61, 61 are slidable.
The large presser 21 can be switched between two positions, upper and lower, by driving the air cylinder. The upper presser 21 is separated from the upper surface of the sewing machine table 11 when in the upper position, and the upper surface height of the sewing machine table 11 at the lower position. The large pressers 21 and 21 are supported in a separated state so that at least the standing plate portion 32 of the binder 30 can be passed between them.

  The support 22 is driven by a pressing motor (not shown) via a ball screw mechanism (not shown), and is supported on the sewing machine table 11 so as to be movable along the X-axis direction. The large pressers 21 and 21 are connected to the support body 22 via a large presser arm 23 having a bifurcated tip, and the large pressers 21 and 21 are moved up and down the two needles 41 and 41. It is arranged to pass through both sides.

Here, the folding device 60 mounted on the edge stitch sewing machine 10 as the present embodiment will be described in detail.
The folding device 60 includes a pair of folding plates 61 and 61 disposed on the left and right sides of the binder 30 and above the bottom plate portion 31, and the folding plates 61 and 61 as the standing plate portion 32. The folding cylinders 62 and 62, which are driving means for folding the ball cloth N along the upper surface of the bottom plate portion 31 by moving separately from each other, and the folding plates 61 and 61 via the folding cylinders 62 and 62, respectively. And a pair of support members 63, 63 that support the tip portions of the folding plates 61, 61 downward, and coil springs 64, 64 that are biasing members that press the tip portions of the folding plates 61, 61 downward. It has.

  The folding plate 61 is a substantially rectangular plate-like member, the longitudinal direction of which is arranged along the X-axis direction, and is placed facing the upper surfaces of the large pressers 21 and 21 in a standby state. (See FIGS. 2 and 3). Each folding plate 61, 61 is connected to the movable part P of the folding cylinder 62, 62 via a connecting member in the middle in the longitudinal direction.

  Each of the folding cylinders 62 and 62 is a single-acting air cylinder, and as shown in FIG. 2, the movable part P is disposed on the binder 30 side, and the tip is directed downward. The folding cylinder 62 is fixedly supported by the support member 63 in a state where the movable portion P can be driven. Further, the folding cylinder 62 holds the folding plate 61 so that its advancing / retreating direction is parallel to the width direction of the folding plate 61 (a direction perpendicular to the longitudinal direction).

The support member 63 holds the folding cylinder 62 substantially along the Y-axis direction at the upper part thereof, and can be rotated around an axis along the X-axis direction at a rotation fulcrum 63a provided at the lower part thereof. The presser arm 23 is connected.
That is, the support member 63 is connected to the movable portion P of the folding cylinder 62 by supporting the folding cylinder 62 so as to be swingable in the direction of the arrow A or B shown in FIG. 2 has a function of supporting the front end portion of the folded plate 61 so as to be movable up and down in the direction of the arrow A or B shown in FIG.

Furthermore, the folding device 60 in the present embodiment is provided with a coil spring 64.
One end of the coil spring 64 is connected to substantially the center in the longitudinal direction of the folding cylinder 62, and the other end of the coil spring 64 is connected to the upper end portion of the large presser 21 described above (see FIG. 2).
The coil spring 64 is a tension spring, and always urges the end of the folding cylinder 62 opposite to the movable portion P in the upward direction, that is, in the direction of arrow A in FIG. That is, the urging force is applied to the folding cylinder 62 fixed integrally with the support member 63 by the coil spring 64, so that the folding cylinder 62 is centered on the rotation fulcrum 63a of the support member 63 in FIG. Accordingly, the folding plate 61 connected to the tip of the movable part P of the folding cylinder 62 is always at the lower side, that is, in the direction of arrow A in FIG. Be energized.
As described above, the folding device 60 is driven by the folding air cylinder 62 so that the folding plates 61 and 61 move obliquely downward toward the upper surface of the bottom plate portion 31 and move closer to the standing plate portion 32, The front ends of the plates 61, 61 are brought into contact with both ends of the ball cloth N extending from the left and right sides of the bottom surface of the bottom plate 31, so that the ball cloth N is folded back and folded on the upper surface of the bottom plate 31. It has become.

And on the lower surfaces of the large pressers 21 and 21 in the present embodiment, the bottom plate is positioned so as to be positioned at a height equal to or greater than the total thickness d when the ball cloth N is folded back so as to sandwich the bottom plate portion 31 from above and below. A rubber plate 24 is attached as a stepped portion that maintains the height of the folding plate 61 with respect to the outer sides of the left and right ends of the portion 31.
The rubber plate 24 can be re-stretched and is attached to the lower surface along the longitudinal direction of the large pressers 21 and 21.
In the present embodiment, the initial height when the front end portion of the folding plate 61 is brought into contact with the ball cloth N, that is, the height G maintained by the rubber plate 24 (step portion) is such that the ball cloth N is the bottom plate portion. Compared with the total thickness d when 31 is folded back from above and below, it is equal to or greater than G, that is, G ≧ d (see FIG. 5). For example, the height corresponds to the fabric thickness when the total thickness d when the thick fabric is folded is about 3.2 mm.
Further, the inclination of the upper surface of each of the large pressers 21 and 21 is such that when folding plates 61 and 61 (described later) that are slidably placed on the upper surfaces of the large pressers 21 and 21 fold the thin ball cloth N, The extension in the moving direction of the tip (broken line S shown in FIG. 3) is formed so as to be closer to the bottom plate portion 31 than the boundary between the bottom plate portion 31 and the standing plate portion 32 of the binder 30. Reference numerals 25 and 25 are flap bases on which the flaps are placed, and are not shown in FIGS. 3, 5 and 7 for the sake of simplicity.

(Sewing operation of the edge stitch sewing machine)
Next, the operation for folding the ball edge cloth in the ball edge sewing machine 10 will be described in detail with reference to FIGS.
Prior to the folding operation of the ball edge cloth N, the large presser 21 is set on the body cloth M placed on the sewing machine table 11, and then on the body cloth M from between the large pressers 21 and 21. The ball edge fabric N is set, and the binder 30 is set on the ball edge fabric N (see FIG. 3). Thereby, both ends of the ball edge cloth N are bent upward between the rubber plate 24 and the end of the bottom plate 31 of the binder 30. Further, at this stage, the folding cylinder 62 is in an OFF state, and the folding plate 61 is disposed on both the left and right sides of each large presser 21, 21, that is, on the high position side of the slope of each large presser 21, 21 and its lower surface. The whole is in a state of being in surface contact with the upper surfaces of the large pressers 21 and 21, and the front end side of the folding plate 61 is urged downward.

First, the folding operation when folding the thin ball edge fabric N will be described.
When each folding cylinder 62, 62 is turned ON, a folding operation is started, and the movable portion P of the folding cylinder 62 moves forward (refers to the moving direction of the folding cylinder 62 during driving). Along with this, the folding plates 61, 61 connected to the movable part P of the folding cylinder 62 descend obliquely downward from the upper surfaces of the large pressers 21, 21, and each large presser 21, It moves close to the upper surface of 21 (see FIG. 4).
Each of the folding plates 61, 61 is a ball that is brought into contact with the rim cloth N when the tip portion thereof passes through the edge of each of the large pressers 21, 21, and extends from the left and right ends of the bottom plate portion 31 of the binder 30. The left and right ends of the edge cloth N are folded and guided to the upper surface side of the bottom plate portion 31.
In the edge stitch sewing machine 10 according to the present embodiment, as described above, the thickness (height) of the rubber plate 24 is generally sufficiently thick among the edge fabrics used for the ball stitching. Therefore, when the thin ball cloth N is folded, the folding cylinder 62 is pressed until the ball cloth N pushed back by the front end of the folding plate 61 comes into close contact with the upper surface of the bottom plate portion 31. Is moved in the direction in which the upper surface of the large presser 21 is lowered (see FIG. 5). Then, when the tip of the folding plate 61 reaches the upper surface of the thin wrapping cloth, the folding plate 61 causes the bottom cloth 31 to bend the ball cloth N by the downward biasing force that always acts on the folding plate 61. The upper surface of the rim cloth N is slid while being pressed to the side, and is advanced to the standing plate portion 32. That is, since the folding plate 61 is always urged downward by the coil spring 64 via the folding cylinder 62, the front end portion of the folding plate 61 is folded around the bottom plate portion 31. It moves so that it may be stretched while urging the upper surface of the upper part of the upper side of the rim, and guides the ball cloth N to the base end part of the standing plate part 32. Accordingly, the ball edge fabric N is suitably folded along the bottom plate portion 31 without causing slack.

Next, a folding operation when folding the thick ball edge fabric N will be described.
First, the operation in which the folding plate 61 moves closer to the upright plate portion 32 by the driving of the folding cylinder 62 is the same as the case where the thin bead fabric N is folded.
In the folding device 60 of the edge stitch sewing machine 10 in the present embodiment, as described above, the thickness of the rubber plate 24 is also adapted to cope with folding a thick ball edge fabric N (hereinafter referred to as a thick fabric N). Therefore, when the folding plate 61 is brought into contact with the thick fabric N, the leading end of the folding plate 61 is brought into contact with the upper surface of the folded thick fabric N from obliquely above. (See FIGS. 6 and 7).
Further, as the thick fabric N is folded, the folding plate 61 is guided such that the tip end portion thereof moves along the upper surface of the thick fabric N. That is, when folding the thick cloth N, the folding plate 61 continues the folding operation while pressing the thick cloth N downward at the front end portion as the folding cylinder 62 is driven.
In other words, in the edge stitch sewing machine 10 according to the present embodiment, the folding plate 62 can be moved up and down by the folding cylinder 62 being supported so as to be swingable around the rotation fulcrum 63a of the support member 63. Even when the thick cloth N is folded, the front end freely slides on the upper surface of the ball cloth N according to the cloth thickness, and the cloth is securely attached to the upper surface of the bottom plate 31. Can be folded. Accordingly, the folding operation is executed without interruption even when folding not only the thin fabric but also the thick fabric.
Then, the folding plate 61 is maintained in the forward position (pressing position) from the start of sewing to the end of sewing after the bead cloth N is suitably folded and held prior to the start of sewing, that is, the needle drop. Keep holding in the folded state.

(Effect of embodiment)
As described above, according to the edge stitch sewing machine 10 according to the present embodiment, the folding operation does not stop due to the difference in the fabric thickness, and the smooth folding operation does not depend on the thickness of the ball margin fabric N to be folded. Can be realized. Moreover, since the front-end | tip part of the folding plate 61 is urged | biased below, it can fold while extending the ball cloth N along the upper surface of the binder 30 (especially bottom-plate part 31), The ball cloth N to be folded in Therefore, the amount of folding can be stabilized without causing slack or the like. Moreover, it is not necessary to replace parts every time the cloth thickness changes, and the cost can be reduced and the operating rate of the edge stitch sewing machine 10 can be improved.
Moreover, when the front end of the folding plate 61 abuts on the ball cloth N during the operation of the folding plate 61, the movement in the traveling direction is not stopped by the ball cloth N, and the thick ball cloth N Therefore, a smooth folding operation can be realized.
Moreover, since the folding plate 61 moves obliquely downward, it can respond to the cloth thickness in a range corresponding to the height change due to the movement of the tip. Moreover, since the folding plate 61 is rotated centering on the base end side of the folding plate 61, the front-end | tip part of the folding plate 61 can be moved up and down with a simple structure.

(Other)
In the present embodiment, the folding plate 61 is supported by the folding cylinder 62 and the support member 63 so that the distal end portion can swing around the base end side. It is good also as a structure which can move a front-end | tip part up and down by supporting the folding plate 61 through an elastic body, such as a spring member and rubber | gum, so that a parallel movement is possible up and down.
Furthermore, the folding plate 61 may have a configuration in which the front end portion is bent upward or the lower portion on the front end side is rounded so as to avoid upward when folding a thick beaded fabric (FIG. 8). (See (a) and (b)).
Further, the folding cylinder 62 that drives the folding plate 61 may be not only a single acting type but also a backward acting type cylinder.
Further, the height G maintained by the rubber plate 24 (stepped portion) is equal to or greater than the total thickness d when the ball cloth N is folded back so as to sandwich the bottom plate portion 31 from above and below (G ≧ In this case, it is desirable that the ball edge fabric N is assumed to be the thickest in the range generally used for sewing.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an overall schematic configuration of a ball stitch sewing machine to which the present invention is applied. FIG. 2 is a front view showing a state before a folding operation as seen in a DD direction in FIG. 1. FIG. 3 is an enlarged view of a main part of FIG. 2. It is a front view which shows the folding operation | movement of the thin cloth by the edge stitch sewing machine which is this embodiment. It is a principal part enlarged view of FIG. It is a front view which shows the folding operation | movement of the thick cloth by the ball stitch sewing machine which is this embodiment. It is a principal part enlarged view of FIG. It is explanatory drawing which shows the front-end | tip part shape of the folding plate applicable as this embodiment. It is explanatory drawing which shows the folding operation | movement by the conventional bead stitch sewing machine. It is explanatory drawing which shows the folding operation | movement by the conventional bead stitch sewing machine. It is explanatory drawing which shows the folding operation | movement by the conventional bead stitch sewing machine.

Explanation of symbols

10 Sewing machine 11 Sewing machine table 20 Large presser feed mechanism (cloth feed mechanism)
21 Large presser 22 Support body 23 Large presser arm 24 Rubber plate 25 Flap base 30 Binder 31 Bottom plate portion 32 Standing plate portion 41 Sewing needle 42 Needle bar 51 Center knife 51b Cutting blade portion 60 Folding device 61 Folding plate 62 Folding cylinder (drive means) )
63 Support member 63a Rotation fulcrum 64 Coil spring (biasing member)
91 Corner knife N Ball edge cloth M Body cloth F Cloth feed direction P Movable part

Claims (4)

There is a bottom plate portion and a vertical plate portion erected perpendicularly to the bottom plate portion, and a needle drop of a sewing needle is placed along the bottom plate portion and the bead cloth placed on the body cloth on the vertical plate portion. A binder to guide the position;
It has a pair of folding plates disposed on both sides of the binder standing plate portion and above the bottom plate portion, and each folding plate moves toward the standing plate portion by driving means, In the edge stitch sewing machine provided with a folding device that folds the edge cloth by folding both ends of the edge cloth extending from the left and right ends of the bottom plate part to the upper surface side of the bottom plate part.
The folding device, the tip portions of the respective folding plate to urge a pair of support members for supporting individually the respective folding plates so as to allow vertical movement, the distal end portion of the respective folding plates always lower side An edge stitch sewing machine comprising an urging member.   The folding device is configured such that when the pair of folding plates are moved closer to each other by the driving means to fold the ball cloth, the front edge portion of each folding plate is outside the left and right ends of the bottom plate portion. The step part which maintains the height of the said folding plate is provided so that it may be located in the height more than the total thickness at the time of being folded back so that the said baseplate part may be pinched | interposed from the upper and lower sides. A perforated sewing machine.   The folding device is configured such that when the pair of folding plates are moved closer to each other by the driving means and the bead cloth is folded, the front end portion moves obliquely downward toward the upper surface of the bottom plate portion. The edge stitch sewing machine according to claim 1 or 2, wherein The folding plate is connected to the movable part of the driving means,
The support member supports the drive means so as to be swingable around a rotation fulcrum,
The one end side of the urging member is connected to the driving means, the other end side is connected to a large presser, and the front end portion of each folding plate is urged downward. The edge stitch sewing machine according to any one of claims 1 to 3.

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