JP4960008B2 - Sewing sewing machine - Google Patents

Description

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

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 cut in the garment cloth and the bead cloth, for example.
That is, in the sewing with the conventional ball stitch sewing machine, the body cloth and the ball brim cloth are arranged on the needle plate upper surface, and the vertical plate is erected vertically on the bottom plate portion and the upper surface thereof. A binder having an inverted T-shaped cross section is placed. 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. At the time of such sewing, the center knife is moved up and down in synchronization with the vertical movement of the sewing needle to form a linear cut for forming the opening of the pocket, and the corner knife arranged in a V shape is moved up and down. Sewing is performed by forming a substantially V-shaped cut that branches in two so as to continue from both ends of the straight cut by movement.

In the above-mentioned bead sewing machine, the two needles move up and down in the vicinity of the downstream end of the binder in the cloth feeding direction and perform sewing, and the center knife cuts further downstream in the cloth feeding direction than the sewing needle. I was going. For this reason, as shown in FIG. 17, in the edge stitch sewing machine, at the downstream side of the cloth feed direction F of the two needles 41 and at the lower end portion of the cloth standing direction 32 of the binder standing plate 32. A guide member 33 that is formed in a bifurcated shape and guides the ball edge cloth in a direction avoiding the center knife 51 is provided, and both ends of the ball edge cloth raised along the upright plate portion 32 are erroneously formed. The center knife 51 was protected from being cut (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 2003-311056

  In the above-described conventional stitch stitch sewing machine described in Patent Document 1, a driving force for the vertical movement of the center knife is applied through a transmission mechanism from a sewing machine spindle that is rotationally driven by a sewing machine spindle motor that is a vertical driving source for two needles. Therefore, it is possible to switch between transmission and disconnection of power by an operation of link arrangement of the transmission mechanism. In other words, it was possible to stop the vertical movement of the center knife when the two needles were driven up and down, but it was not possible to drive only the center knife when the two needles were stopped.

FIG. 18 is an explanatory diagram showing the relationship between the arrangement of the straight cut S by the center knife, the cut V by the corner knife, and the seam T by the two needles 41. In FIG. 18, it is assumed that cloth feeding is performed in the F direction.
In FIG. 18, the needle drop position of the two needles 41 and the position of the center knife 51 at the sewing end position are illustrated by two-dot chain lines. Further, the total length of the range in which sewing is performed is the sewing length K, the length along the cloth feed direction F of the cut V on the downstream side in the cloth feed direction formed by the corner knife is D1, and the downstream end of the center knife 51 Is the distance from the two needles 41 to H.
As described above, since the center knife 51 alone cannot be driven in the state where the vertical driving of the two needles 41 is stopped, the distance (K−) between the cutting start position by the center knife 51 and the sewing end position. When D1) is smaller than the distance H from the downstream end of the center knife 51 in the cloth feed direction to the two needles 41 (K−D1 <H), the two needles 41 sew from the sewing start position to the sewing end position. Still, the center knife 51 could not start cutting. In other words, since the sewing distance is short, there is a disadvantage that it is not possible to perform the edge stitch when K−D1 <H.

  In this case, it is conceivable to design the two needles 41 and the center knife 51 closer to each other so that the distance H from the downstream end of the center knife 51 to the two needles 41 is designed to be smaller, as shown in FIG. In addition, since the guide member 33 of the standing plate portion 32 of the binder is disposed between the two needles 41 and the center knife 51, when the distance between the two needles 41 and the center knife 51 is made closer, the guide member The gap between the sewing needle 33 and the sewing needle 41 is narrowed, and the ball-thick cloth with a thick cloth cannot pass therethrough. In other words, the conventional sewing machine has a disadvantage that it is difficult to sew a thick cloth.

  An object of the present invention is to facilitate the sewing regardless of the thickness of the ball edge fabric.

According to a first aspect of the present invention, there is provided a needle up-and-down movement mechanism that forms two straight seams using two sewing needles by a sewing machine spindle motor, and a cloth above the body cloth placed on the sewing machine table. A bottom plate portion and a vertical plate portion erected perpendicularly from the bottom plate portion, arranged along the feeding direction, and a bead from one side surface of the vertical plate portion to the other side surface through the bottom plate portion A binder that guides the needle drop position of each sewing needle along the cloth, and a garment cloth along the body cloth and the binder by the feed driving means separate from the sewing machine spindle motor. a cloth feed mechanism that sends toward the position, the disposed the cloth feeding direction downstream side of the needle, the center knife that form a straight cut between the two straight seam, vertical movement of the center knife A female motor as a drive source of A first link body and a second link body, a connection mechanism for connecting the female motor and the center knife, and a connection point between the first link body and the second link body, An air cylinder that switches between an operating state and a restrained state of the center knife, and a corner knife mechanism that forms cuts at both ends of the linear cut from the end of the cut to the ends of the two straight stitches, respectively , The stitch length of the two straight stitches, the distance from the vertical movement start position of the sewing needle to the cutting start position by the center knife, and the downstream edge of the center knife in the cloth feed direction to the sewing needle a setting input section for setting input data including a distance, determined based on the setting input, distance from the cutting start position to the end portion of the straight seam, the center main Of when the cloth feeding direction downstream end less than the distance along the cloth feeding direction to the needle, stops the two sewing needles before Symbol main shaft motor after completion of sewing by the, the feed drive means When the body cloth and the ball edge cloth reach the cutting start position by the center knife by driving, the feed driving means is driven with respect to the body cloth and the ball edge cloth conveyed to the cutting start position. The driving of the knife motor is started to form a straight cut from the cutting start position to the cutting end position, and the distance from the cutting start position to the end portion of the straight stitch is the downstream side in the cloth feed direction of the center knife When the distance from the end portion to the sewing needle is longer than the distance along the cloth feed direction, the transport distance of the body cloth and the beaded cloth moves forward from the vertical movement start position of the sewing needle. When the distance from the center knife to the cutting start position and the distance along the cloth feeding direction from the downstream edge of the center knife in the cloth feeding direction to the sewing needle is reached, the driving of the knife motor is started. And a cutting control means for starting up and down movement of the center knife .

  According to the invention of claim 1, while performing cloth feeding by the cloth feeding mechanism, by driving the needle up-and-down moving mechanism and the center knife mechanism that are driven by a separate driving source from the cloth feeding mechanism, A seam is formed by the vertical movement of the two needles on both sides of the vertical plate part of the binder, and a linear cut is formed between the two seams by the vertical movement of the center knife on the downstream side in the cloth feed direction of the vertical plate part. Is done. Then, the distance from the cutting start position by the center knife determined based on the setting input by the setting input means to the end portion of the straight seam is along the cloth feeding direction from the downstream end of the center knife in the cloth feeding direction to the sewing needle. If it is shorter than the distance, the sewing machine spindle motor is stopped by the cutting control means after the sewing with the two sewing needles is finished, and the body cloth and the ball cloth reach the cutting start position by the center knife by driving the feed driving means. Then, the operation of forming the straight cut from the cutting start position to the cutting end position by starting the driving of the center knife mechanism while driving the feed driving means with respect to the body cloth and the ball cloth fed to the cutting start position Processing is performed. This makes it possible to form a corner cut that is shorter in the cloth feed direction than the distance from the upstream edge of the center knife in the cloth feed direction to the sewing needle, and at the minimum, the width along the cloth feed direction of the center knife. A straight line cut of a short distance equal to can be formed. Accordingly, the range of linear cuts that can be formed can be enlarged, and the sewing of the ball stitching can be facilitated.

(Overall configuration of the embodiment of the invention)
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.

The bead stitch sewing machine 10 sews the bead fabric B to the body fabric M, and also forms a straight cut S along the feed direction of these fabrics, and substantially V-shaped cuts at both ends of the cut S. A sewing machine that forms V (see FIG. 18).
And the said edge stitch sewing machine 10 consists of the sewing machine table 11 used as the sewing work table, the sewing machine frame 12 arrange | positioned at the sewing machine table 11, the body cloth M, and the ball cloth B as shown in FIG. A large press feed mechanism 20 as a fabric feed mechanism that feeds the fabric, a binder 30 that presses the rim cloth B from the upper side of the body fabric M, and a binder in the vicinity of the downstream side in the fabric feed direction F of the binder 30. The needle up-and-down moving mechanism 40 (see FIG. 2) that performs needle dropping on both sides of the standing plate portion 32 of the 30 and the sewing frame 41 that is supported by the sewing machine frame 12 and intermediate each sewing needle 41 on the downstream side in the cloth feeding direction. A moving knife mechanism 50 (see FIG. 5) as a center knife mechanism that raises and lowers the center knife 51 to form a cut in each of the fabrics B and M, and a substantially V-shaped cut at positions that are opposite ends of the linear cut S A corner knife mechanism 90 to form the eye V, and an operation control unit 80 for controlling the above units (see FIG. 8).
Each part is described in detail below.

(Sewing table and sewing frame)
As shown in FIG. 1, the upper surface of the sewing machine table 11 is 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 are arranged on the sewing machine table 11, and a corner knife mechanism 90 is arranged 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 out from the horizontal hook. It is like that.
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 downstream in the cloth feeding direction F, and the cloth is cut by cooperation with the center knife 51. A fixed knife is not placed.

  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 part 12c is extended, and the main components of the needle up-and-down moving mechanism 40 and the moving knife mechanism 50 are stored in the arm part 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. 2 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 holding the respective sewing needles 41 of the two needles at the lower end, and each needle bar 42. A support frame 43 that is slidably supported along the longitudinal direction, a needle bar holder 44 that simultaneously holds two needle bars, and a sewing machine spindle motor 45 (see FIG. 8) that serves as a drive source for the sewing needle up and down movement. A sewing machine main shaft 46 that is rotationally driven by a sewing machine main shaft motor 45, a rotary weight 47 that is fixedly connected to one end of the sewing machine main shaft 46, and a rotational weight 47 that is rotationally moved. And a crank rod 48 having the other end connected to the needle bar holder 44, and a rotation shaft 49 having one end connected to the support frame 43 and applied with a rotation driving force by a rotation driving source (not shown). have.

The support frame 43 is supported by a rotating shaft 49, and the rotating shaft 49 is supported so as to be rotatable along the Y-axis direction inside the arm portion 12c. On the other hand, each needle bar 42 is supported by the support frame 43 in parallel with each other along the direction orthogonal to the rotation shaft 49. Since the support frame 43 is arranged so that each needle bar 42 is generally along the Z-axis direction, the lower end portion of each needle bar 42 is applied when rotational force is applied within a predetermined angle range from the rotation shaft 49. The sewing needles 41, 41 located in the position are moved in parallel with the sewing direction.
The rotary shaft 49 performs a so-called back tack sewing that prevents the sewing thread at the sewing start and the sewing end from being unwound by performing sewing with a short stroke in the direction opposite to the cloth feeding direction and performing sewing so as to overlap from above. In order to do this, a driving force is applied from a rotational drive source. Therefore, at the time of normal sewing, the rotation shaft 49 is held in a state where each needle bar 42 is parallel to the Z-axis direction.

  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-axis at one end portion. Only the moving component in the direction is transmitted to the needle bar holder 44, and each needle bar 42 reciprocates up and down to form two parallel seams T on the fabric using the two sewing needles 41, 41. It has become.

(Moving knife mechanism)
3 is a perspective view of the moving knife mechanism 50 and the needle up-and-down moving mechanism 40 in a severable state, FIG. 4 is a perspective view of the cutting state of the moving knife mechanism 50 and the needle up-and-down moving mechanism 40, and FIG. It is a perspective view of the moving knife mechanism 50 seen from a different direction.
The moving knife mechanism 50 includes a center knife 51 that forms a straight cut, a knife bar 52 that is provided with a center knife 51 at the lower end and is slidably supported along the Z-axis direction in the arm 12c, and a sewing machine. A metal bearing 53 that is fixed to the frame and slidably supports the female bar 52 along its longitudinal direction, a female bar holder 54 that is fixedly installed at an intermediate position in the longitudinal direction of the female bar 52, and the female bar holder 54 is provided. The frame 55, the guide frame 56 that is fixedly supported by the sewing machine frame 12 and guides the movement in the vertical direction without rotating the knife rod 52 via the frame 55, and the stepping that is the driving source for the vertical movement of the center knife 51 A crank rod 5 having one end connected thereto through a female motor 57 as a motor and an eccentric cam 58 mounted eccentrically with respect to the output shaft 57b of the female motor 57. And an input arm 60 having a swing end connected to the other end of the crank rod 59 and a bearing 68 fixed to the sewing machine frame with one end connected to the input arm 60 and pivoted. A rotating shaft 61 to be performed, an output arm 62 that is integrally formed with the rotating shaft 61 at the other end portion of the rotating shaft 61 and swings, and one end portion is connected to a swinging end portion of the output arm 62. Switching operation between the first link body 63, the second link body 64 that connects the other end of the first link body 63 and the female bar clamp 54, and the center knife 51 can be cut and cut off. A connecting point between the air cylinder 65 serving as a driving source for the motor, the lever member 66 whose one end is connected to the plunger of the air cylinder 65 and swinging, and the first link body 63 and the second link body 64. Connecting link body 6 that connects J and the other end of the insulator member 66 When, and a stopper 69 for stopping the plunger during projection of the air cylinder 65 at a predetermined position.

  The moving knife mechanism 50 is in a severable state in which the rotational driving force of the knife motor 57 is converted into a vertical reciprocating motion to the center knife 51 and transmitted when the air cylinder 65 is in the retracted position (state shown in FIG. 3). When the air cylinder 65 is in the forward position (the state shown in FIG. 4), 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.

In other words, the lever member 66 is supported by the sewing machine frame 12 so that the intermediate position G in the longitudinal direction becomes the fulcrum of the swing and the swing axis of the fulcrum is directed in the Y-axis direction. When the air cylinder 65 is in the retracted state, the lever member 66 swings the output arm 62 at the connection point J between the first link body 63 and the second link body 64 via the connection link body 67. The position is maintained at a position lower than the center line.
When the female motor 57 rotates in this state, one end of the crank rod 59 is moved circularly by the eccentric cam 58 mounted on the output shaft 57b oriented in the Y-axis direction. The crank rod 59 moves back and forth at the other end by a circular motion at one end thereof, and swings the input arm 60. As a result, the rotation shaft 61 rotates and swings the output arm 62.
The connection point J between the first link body 63 and the second link body 64 has a radius of the connection link body 67 centered on one end portion of the connection link body 67 (connection end portion with the lever member 6). It is restricted to a state where only arc motion is possible. Then, the connecting point J performs the arc motion, so that the swinging motion of the output arm 62 moves the knife bar 52 and the center knife 51 up and down via the first link body 63 and the second link body 64. A cutting operation is performed.

On the other hand, when the air cylinder 65 is in the advanced state, the plunger of the air cylinder 65 is stopped at a position where it abuts against the stopper 69, and the lever member 66 is connected to the first link body 63 via the connecting link body 67. The connecting point J with the second link body 64 is pulled up and maintained at a position on the center line of the swing of the output arm 62. At this time, the center knife 51 is also pulled up to the standby position (the position in FIG. 4) where the fabric is not cut.
The distance between the centers of rotation at both ends of the first link body 63 is set to a length that matches the swing radius of the output arm 62. When the output arm 62 starts to swing by driving the knife motor 57 in a state where the connection point J is located on the center line of the swing of the output arm 62, the first link body 63 is also centered on the connection point J. As a result, the second link body 64 is not applied with any driving force. Therefore, the center knife 51 does not move up and down, and remains stopped at the standby position.
Therefore, the operation state and the restrained state of the center knife 51 can be switched by driving the air cylinder 65.

  The center knife 51 is composed of a pointed portion 51a protruding downward and a cutting blade portion 51b that is smoothly inclined (see FIG. 9). The center knife 51 is set so that the lower end portion of the pointed portion 51a is always positioned below the upper surface of the needle plate 13 in the up-and-down movement state in the above-described operating state, and in the stopped state in the standby position. The lower end portion of the pointed portion 51 a is set to be higher than the upper surface of the needle plate 13.

(binder)
6 is a plan view of the binder 30 and FIG. 7 is a perspective view.
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 downstream end in the cloth feeding direction of the standing plate portion 32. The guide member 33 that guides the ball edge cloth B while avoiding the center knife 51 and the longitudinal direction that guides the both ends in the width direction of the ball edge cloth B along the both sides of the standing plate part 32 respectively. The guide part 34 is provided.
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. Further, substantially U-shaped cutouts 31a and 31a for the two sewing needles 41 and 41 to perform needle dropping are formed at the front end portion in the cloth feeding direction of the bottom plate portion 31, respectively.
The standing plate part 32 is a flat plate having a rectangular shape as a whole except for a portion in the vicinity of the guide member 33, and on the upper surface of the bottom plate part 31, at an intermediate position in the width direction (Y-axis direction) of the bottom plate part 31. It is erected vertically with the bottom plate portion 31 aligned with the longitudinal direction. 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 edge cloth B is set on the needle plate 13 so as to overlap the upper side of the body cloth M, the binder 30 is placed from above, and the width direction of the ball edge cloth B (Y-axis direction in FIG. 6). Both ends of the bottom plate 31 are raised upward from both ends in the width direction, and further, both ends in the width direction of the ball cloth B are along the side surfaces on both sides of the standing plate 32, respectively. Is held by the large pressers 21 and 21 to be held. In other words, the rim cloth B is placed along one side surface of the standing plate portion 32 from the other side surface 32 through the bottom plate portion 31. In this way, while the ball cloth B is set around the binder 30, while the ball cloth B and the body cloth M are fed, the two needles 41, 41 are used for sewing on both sides of the standing plate portion 32. A straight cut S is formed by the vertical movement of the center knife 51.

  As described above, the width direction both ends of the ball cloth B are two in close proximity to and opposite to the both side surfaces of the standing plate portion 32 so as to maintain the state along the both side surfaces of the standing plate portion 32, respectively. Flat vertical guide portions 34, 34 are provided. Each of the vertical guide portions 34 is bent so that a gap with the upright plate portion 32 is enlarged at the upstream end portion in the cloth feeding direction, and a constant gap is maintained on the downstream side. That is, the width direction one end part of the ball cloth B is invited into the gap between each vertical guide part 34 and the standing plate part 32, and the one end part maintains a state along one side surface of the standing plate part 32. Guided.

  In addition, a center knife 51 is disposed on the extended line of the upright plate portion 32 immediately downstream in the cloth feeding direction F of the binder 30. Since both end portions in the width direction of the rim cloth B move to the downstream side in the cloth feeding direction F along the standing plate portion 32, guide members 33 are provided so as not to be torn by the center knife 51. Yes. The guide member 33 is integrally formed from the downstream end portion in the feed direction F of the upright plate portion 32 and is bifurcated in the same direction F so that the shape in plan view is substantially V-shaped. It is formed to become. The guide member 33 is arranged so as to be as close as possible to the center knife 51 so as to cover the center knife from both sides in order to more effectively guard the ball cloth B from the center knife 51. 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 through the gap C between the vertical guide portion 34 and the guide member 33 when the fabric is fed. Guided in a direction to avoid the knife 51.

(Large press feed mechanism)
The large presser feed mechanism 20 includes large pressers 21 and 21 that press the respective ends in the width direction of the ball cloth B set on the binder 30 from above, and a support body 22 that supports these large pressers 21 and 21. An air cylinder (not shown) that moves the large pressers 21 and 21 up and down through the support body 22, and the garment cloth B and the body cloth M pressed by the large pressers 21 and 21 in the cloth feed direction F through the support body 22. The presser motor 23 is a feed driving means that is separate from the sewing machine spindle motor 45 to be moved.
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. Further, the two large pressers 21 and 21 are supported in a state of being separated so that at least the standing plate portion 32 of the binder 30 can be passed 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 through both sides of 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)
The corner knife mechanism 90 is disposed below the sewing machine table 11 and in a passage path of the large pressers 21 and 21 by the large presser feed mechanism 20, and the ball cloth B and the body that have been conveyed by the large presser feed mechanism 20. By pushing the corner knife 91 through the fabric M from below, a substantially V-shaped cut V is formed at the positions corresponding to both ends of the straight cut S.
That is, the corner knife mechanism 90 includes two corner knives 91 and 91 arranged at intervals along the cloth feeding direction F, and a vertical movement motor (not shown) that moves the corner knives 91 and 91 up and down, respectively. ing.

Each corner knife 91 is composed of a pair of triangular knives arranged so that the shape seen from the distal end side is V-shaped, and is supported with the distal end portion facing upward. Then, the V-shaped cut V can be formed in the fabrics B and M by moving from below to above the upper surface of the sewing machine table 11 by the vertical movement motor. Each corner knife 91 can adjust the angle between the pair of triangular knifes, and can correspond to the interval between the two seams T by the two needles 41 and 41.
The two corner knives 91 are supported so that the openings of the V-shaped cuts formed by the two corner knives 91 are opposite to each other. The interval between the two corner knives 91 can be adjusted.

  In the corner knife mechanism 90, when the fabrics B and M in which the two seams T and the linear cut S are formed are conveyed by the large press feed mechanism 20 to a position directly above the corner knife mechanism 90. The two V-shaped cuts V are formed in the fabrics B and M by moving the two corner knives 91 and 91 up and down at the respective end positions of the cut S. In other words, as shown in FIG. 18, by the corner knife mechanism 90, one end of the linear cut S extends from one end of the linear cut S to the closest end of each of the two seams T. And the other cut V extending from the other end of the straight cut S to the closest end of each of the two seams T.

(Control system for hem stitch machine)
FIG. 8 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 a display panel 84 for displaying predetermined characters or image information, a setting switch 85 for performing screen selection and command input for making various settings provided in the display panel 84, various types A numeric keypad 86 for inputting numerical values and the determination and cancellation of the setting and a start switch 87 for inputting the start of sewing are connected via an input / output circuit (not shown). That is, the setting switch 85 and the numeric keypad 86 function as setting input means in the present embodiment for setting and inputting various numerical values (for example, distances K, H, D1, D2, W...) Described later. .

  The operation control means 80 is connected to a sewing machine spindle motor 45, a presser motor 23, and a female motor 57, which are objects of control, via drivers 45a, 23a, and 57a, respectively. Further, an air cylinder for moving the binder 30 up and down, an air cylinder for moving up and down the large pressers 21 and 21, and motors for vertical movement (not shown) for moving up and down the corner knives 91 and 91 are provided via a screwdriver. It is connected to the. Similarly, an electromagnetic valve 70 of the air cylinder 65 that switches between an operating state and a non-operating state of the center knife 51 is connected via a driver 70a.

  The operation control means 80 is related to the processing of the CPU 81 that performs various controls, the ROM 82 in which various control functions, operations, and control data or various sewing data to be described later of the edge stitch sewing machine 10 are written. A RAM 83 for storing various data in the work area is provided.

Here, the premise of the process for performing the motion control inherent to the edge stitching performed by the CPU 81 will be described first.
As described above, in the ball stitching, a straight cut S that is parallel to the stitch T is formed between the two stitches T by the two needles 41 and 41, and V V is formed at both ends of the cut S. Each of the character-shaped cuts V is formed (see FIG. 12).
As shown in FIGS. 9 and 12A, the center knife 51 that forms the cut S is located downstream in the cloth feed direction F by a distance L from the double needle 41 in the position of the upstream end in the cloth feed direction F. Arranged on the side. Further, as shown in FIG. 12B, the formation start position of the cut S by the center knife 51, that is, the cutting start position is V-shaped formed on the sewing start side with respect to the vertical movement start position of the sewing needle 41. This is a position that is retracted by a length D1 along the cloth feed direction F of the cut line V. Therefore, in order to start the formation of the linear cut S from the retracted position, the length D1, the tooth width W of the center knife 51, and the distance L after the needle drop of the first needle of the sewing needle 41 is performed. It is necessary to start the knife dropping of the center knife 51 after the fabrics B and M are fed by the total length (D1 + W + L).

  Further, as shown in FIG. 12A, the end position of the linear cut S, that is, the cutting end position, is the cloth feed of the V-shaped cut V formed on the cutting end position side from the end position of the seam T. It is necessary to form it so that only the length D2 along the direction F is in front. In order to increase the distance from each sewing needle 41 to the upright plate portion 32 and the gap distance C from the distal end portion of the vertical guide portion 34 to the guide member 33, the ball edge sewing machine 10 of the present embodiment is centered. The distance L between the knife and the sewing needle (L = H−W) is secured to some extent, but the distances D1 and D2 along the cloth feed direction F of the cut V formed on the start side and the end side of the cut S are respectively The setting switch 85 and the numeric keypad 86 described above can be set to desired values. For this reason, when the dimension is set such that the distance D2 of the cut V at the end of the cut S is smaller than the distance L between the center knife and the sewing needle (L> D2), the final stitch at the time of sewing In addition, the center knife 51 still forms the cut S only up to a position a distance L before the final needle position (see FIG. 12A). Accordingly, the center knife 51 stops the vertical movement of the sewing needle 41 from the time of the final needle until the cloth is fed further by a distance (distance expansion distance) of (distance L−length D2). It is necessary to drive the knife 51, and it is necessary to perform operation control and processing in consideration of this.

  On the other hand, when the distance D2 along the cloth feeding direction of the cut V formed on the terminal side of the cut S is set larger than the distance L between the center knife and the sewing needle (L <D2), the center knife 51 is Even when the end of the cut S is reached, the sewing needle 41 has not yet reached the sewing end position (see FIG. 14). Therefore, after the center knife 51 has reached the end of the cut S, it is necessary to continue the hand movement by the distance D2- (HW) in a state where the vertical movement of the center knife 51 is stopped.

In order to perform such operation control, the CPU 81 previously stores the lengths D1 and D2 of the ROM 82 along the cloth feed direction F of the cut V, the distance L between the center knife and the sewing needle, and the tooth width W of the center knife 51. When data indicating values is stored or when each data is input by the setting switch 85 and stored in the RAM 83, the first stitches of the sewing needles 41 and 41 are stored by a predetermined processing program stored in the ROM 82. Then, the cloth is fed by the distance of D1 + W + L (see FIG. 12B), and the operation control for starting the driving of the knife motor 57 for driving the center knife is performed.
In addition, when the knife motor 57 is driven in advance, the cloth cylinder is fed by a distance of (D1 + W + L), and then the operation control for switching the air cylinder 65 from the protruding state to the retracted state may be performed, or the distance of D1 + W + L may be performed. Only after the cloth feed is performed, operation control may be performed in which the drive start of the knife motor 57 and the backward movement of the air cylinder 65 are performed simultaneously.
The first stitch of the sewing needle 41 is detected by detecting a signal output every rotation from an encoder provided in the sewing machine spindle motor 45. Further, the detection of the cloth feed at a distance of D1 + W + L is performed by counting the number of rotations of the pressing motor 23.

Further, when the ROM 82 or RAM 83 stores data indicating the values of the length D2 and the distance L (L> D2), the CPU 81 performs sewing according to a predetermined processing program stored in the ROM 82. After the last needle drop of the needles 41 and 41 is performed, the cloth is fed by the gap extension distance (L-D2), and then the operation control for stopping the driving of the knife motor 57 for driving the center knife 51 is performed ( (See FIG. 12A).
Further, the operation control for switching the air cylinder 65 from the retracted state to the protruding state may be performed after the cloth feed is performed by the distance of the gap extension distance (L-D2) while the knife motor 57 is driven. Operation control for simultaneously stopping the driving of the knife motor 57 and the protruding operation of the air cylinder 65 may be performed after the cloth is fed by the distance of the extension distance (L-D2).
The last stitch of the sewing needle 41 is detected by counting signals output every rotation from an encoder provided in the sewing machine spindle motor 57. Further, the detection of the cloth feed at the gap expansion distance (L-D2) is performed by counting the number of rotations of the pressing motor 23.

  Further, the CPU 81 in the present embodiment is configured such that the distance (K-D1) from the cutting start position determined based on the setting input from the setting switch 85 and the numeric keypad 86 to the end portion of the straight seam T is the cloth of the center knife 51. When the distance H along the cloth feed direction from the downstream end in the feed direction to the sewing needle 41 is shorter (H ≧ K−D1), the sewing machine spindle motor 45 is moved after the formation of the seam T by the two sewing needles 41 is completed. When the body cloth M and the ball cloth B reach the cutting start position by the center knife 51 by driving the holding motor 23 which is a feed driving means, the body cloth M and the ball cloth which are conveyed to the cutting start position. The drive of the moving knife mechanism 50, which is the center knife mechanism, is started while driving the holding motor 23 with respect to B to form a straight cut S from the cutting start position to the cutting end position. Functions as that disconnect control means.

  That is, the distance (K-D1) from the cutting start position of the cut S to the terminal end of the straight seam T is larger than the distance H along the cloth feeding direction from the downstream end of the center knife 51 in the cloth feeding direction to the sewing needle 41. When the length is short (H ≧ K−D1), as shown in FIG. 18, the center knife 51 has not yet reached the cutting start position even after the two stitches T have been formed by the sewing needle 41. It becomes. Therefore, as shown in the time chart of FIG. 10, after forming the seam T to the end position first (FIGS. 10A to 10C), the fabric B and M is transported by a distance H- (K-D1) (FIGS. 10D to 10E), and then the center knife 51 is lowered (FIG. 10E), that is, moved up and down to start cutting the cut S (FIG. 10 (f)). Then, the fabrics B and M are conveyed by a distance (K-D1-D2-W) while driving the center knife 51 up and down to the cutting end position to form a cut S (FIG. 10 (f)). ~ (G)).

(Description of operation of embodiment)
Next, the operation of the sewing machine 1 having the above configuration will be described based on the flowchart shown in FIG.
First, when the sewing of the ball stitch is started, the CPU 81 stores the total sewing length in the range where the sewing is performed, which is stored in the ROM 82 in advance or is set and input by the setting switch 85 and the numeric key 86 and stored in the RPM 82. K is read (step S1), and then the distance D1 along the cloth feed direction F from the start of sewing to the tip (cutting start position) of the straight cut S, and the cloth feed direction F from the end of sewing to the end of the straight cut S The distance D2 along the cloth feed direction F from the downstream end of the center knife 51 in the cloth feed direction to the sewing needle 41, the width W of the center knife 51 in the cloth feed direction F, and the like are read (step S1). S2).
Next, the CPU 81 drives the presser motor 23 via the driver 23a, and starts conveying the fabric composed of the body cloth M and the ball cloth B along the cloth feeding direction F (step S3) (FIG. 10 (a)). )reference).

  When the conveyance of the fabric is started, the CPU 81 determines whether or not the fabric has reached the sewing start position (step S4). In this embodiment, the arrival at the sewing start position is performed by a cloth end position detection sensor (not shown). When the cloth reaches a predetermined sewing start position, a detection signal detected by the cloth end position detection sensor is received. The data is output to the CPU 81. If the arrival of the fabric at the sewing start position is not detected (step S4; No), the conveyance of the fabric is continued until it is detected (step S3). If the arrival of the fabric at the sewing start position is detected (step S4; Yes), the CPU 81 starts the vertical movement of the sewing needle 41, that is, sewing by driving the sewing machine spindle motor 45 via the driver 45a. Then, the formation of the seam T is started (step S5) (see FIG. 10B).

  When sewing is started, the CPU 81 determines the distance H along the cloth feed direction F from the downstream end of the center knife 51 in the cloth feed direction to the sewing needle 41 and the distance from the cutting start position to the end of the straight seam T ( An arithmetic processing for comparing the magnitude with K-D1) is performed (step S6). If H is smaller than K−D1 (H <K−D1) (step S6; Yes), whether or not the fabric conveyance distance from the start of sewing has reached H + D1, that is, the cutting start position by the center knife 51 It is determined whether or not the fabric has reached (step S7). If the fabric conveyance distance from the start of sewing does not reach H + D1 (step S7; No), the conveyance is continued, and if the fabric conveyance distance from the start of sewing reaches H + D1 (see FIG. 13) (step S7; Yes), the CPU 81 starts the vertical movement of the center knife 51 by driving the knife motor 57 via the driver 57a (step S8). When the vertical movement of the center knife 51 is started, the CPU 81 performs a calculation process for comparing the size of the distance D2 and the distance (H-W) while driving the presser motor 23 to form the seam T and the cut S. (Step S9). When D2 is larger than H-W (D2> H-W) (step S9; Yes), the CPU 81 determines whether the fabric conveyance distance from the start of sewing has reached K-D2 + H-W (see FIG. 14). That is, it is determined whether or not the fabric has been transported to the cutting end position by the center knife 51 (step S10). If not reached (step S10; No), the formation of the seam T and the center cut S is continued while conveying the fabric until it reaches, and if reached (step S10; Yes), the female motor is passed through the driver 57a. 57 is stopped and the center knife 51 is held in the upper position to perform the operation control to stop the vertical movement (step S11).

  When the vertical movement of the center knife 51 is stopped, the CPU 81 determines whether or not the fabric conveyance distance from the start of sewing has reached K (step S12). If K has not been reached (step S12; No), the sewing needle 41 is continuously moved up and down and the fabric is conveyed until it reaches the seam T to form a seam T, and when K is reached (step S; Yes). Operation control for stopping the sewing machine spindle motor 45 is performed via the driver 57a (step S13). Thereafter, the CPU 81 determines whether or not the fabric conveyed by the large presser mechanism 20 has reached the corner knife cutting position, that is, the formation position of the corner cut V (step S14), and if not reached (step S14; No) ) Carry until it reaches. When the fabric reaches the corner knife cutting position (step S14; Yes), the CPU 81 drives a vertical movement motor that raises and lowers each corner knife 91, 91 up and down via a driver (not shown), and sets the corner break V. After the formation (step S15), operation control for ending the sewing operation is performed.

  In step S9, when D2 is smaller than HW (D2 ≦ HW) (step S9; No), the CPU 81 conveys the fabric while driving the sewing needle 41 and the center knife 51 up and down. Then, while forming the seam T and the cut S, it is determined whether or not the transport distance of the fabric from the start of the sewing has reached K, that is, the total sewing length (see FIG. 12) within the sewing range (step 12). S16). If the fabric conveyance distance does not reach K (step S16; No), the conveyance of the fabric is continued while forming the seam T and the straight line cut S until reaching the K, and the conveyance distance reaches K (step S16; If yes, the sewing machine spindle motor 45 is stopped via the driver 45a, and the needle up / down movement, that is, the formation of the seam T is stopped with the sewing needle 41 held at the upper position (step S17).

  When the needle up-and-down movement is stopped, the CPU 81 continues the vertical movement of the center knife 51 and the conveyance of the fabric to continue the formation of the linear cut S, while the conveyance distance of the fabric from the start of sewing becomes K−D2 + H−W. It is determined whether or not the cloth has been reached, that is, whether or not the cloth has been conveyed to the cutting end position by the center knife 51 (step S18). If the transport distance does not reach K−D2 + H−W (step S18; No), the transport is continued until it reaches, and if the transport distance reaches K−D2 + H−W (step S18; Yes), the driver 57a. By stopping the knife motor 57 via, operation control for stopping the vertical movement of the center knife 51 in a state where the center knife 51 is held at the upper position is performed (step S19). Thereafter, the CPU 81 shifts to step S14 to form the corner break V in the same manner as described above, and then performs operation control to end the sewing operation.

  And in the edge stitch sewing machine 10 which is this embodiment, as shown in FIG.15 and FIG.16, distance K-D1 along the cloth feed direction F from the front-end | tip (cutting start position) of the linear cut S to the terminal end of the seam T is shown. Is shorter than the distance H along the cloth feeding direction F from the downstream end in the cloth feeding direction F of the center knife 51 to the sewing needle 41, that is, the distance K-D1 is shorter than the distance H in step S6. In the case of (K−D1 ≦ H) (step S6; No), the CPU 81 determines whether the fabric conveyance distance from the start of sewing has reached the total sewing length K (see FIG. 15) within the range in which sewing is performed. Is determined (step S20). When the conveyance distance does not reach K (step S20; No), the stitch T is formed by continuing the vertical movement of the sewing needle 41 and the conveyance of the fabric, and the conveyance distance reaches K (step S20; Yes). In this case, the sewing machine main shaft motor 45 is stopped via the driver 45a, and the vertical movement of the sewing needle 41 is finished with the sewing needle 41 held in the upper position (see FIG. 10C) (step S21).

  After the vertical movement of the sewing needle 41, that is, the formation of the seam T is completed, the CPU 81 drives the presser motor 23 (see FIG. 10D) to convey the fabric while the fabric conveyance distance becomes H + D1. It is determined whether or not the cloth has reached, that is, whether or not the cloth has been conveyed to the cutting start position by the center knife 51 (step S22). When the conveyance distance does not reach H + D1 (step S22; No), the pressing motor 23 is driven until the conveyance distance is reached, and the conveyance of the fabric is continued, and the conveyance distance reaches H + D1 (step S22; Yes) (FIG. 10). (See (e)), the knife motor 57 is driven via the driver 57a, and the operation control for starting the vertical movement of the center knife 51 is performed (step S23).

  When the vertical movement of the center knife 51 is started, the CPU 81 drives the knife motor 57 and the presser motor 23 (see FIG. 10F), and the fabric conveyance distance from the start of sewing reaches K−D2 + H−W. It is determined whether or not the fabric has been conveyed to the position where the center knife 51 cuts (step S24). When the conveyance distance does not reach K−D2 + H−W (step S24; No), the conveyance of the fabric is continued while the straight knife S is formed by the vertical movement of the center knife 51 until the conveyance distance is reached, and the conveyance distance is K−. When D2 + H−W is reached (step S24; Yes) (see FIG. 10G), the CPU 81 stops the pressing motor 23 through the driver 23a and stops the transfer of the fabric, and the female motor through the driver 57a. Operation control for stopping the vertical movement of the center knife 51 is performed in a state where the center knife 51 is held at the upper position by stopping 57 (step S25). Thereafter, the CPU 81 proceeds to step S14 and performs operation control to end the sewing operation after forming the corner break V in the same manner as described above.

(Effect of embodiment)
As described above, according to the sewing machine 1 according to the present embodiment, the straight seam T from the formation start position of the cut S by the center knife 51, that is, the cutting start position, determined based on the setting input from the setting switch 85 and the numeric keypad 86. When the distance (K-D1) along the cloth feeding direction F to the terminal end of the center knife 51 is shorter than the distance H along the cloth feeding direction F from the downstream edge of the center knife 51 to the sewing needle 41 (K- D1 ≦ H), the CPU 81 functions as a cutting control means, so that the sewing machine spindle motor 45 is stopped after the sewing by the two sewing needles 41, 41, and the body cloth M and the edge of the body are driven by the pressing motor 23. When the cloth B reaches the cutting start position by the center knife 51, the pressing motor 23 is driven with respect to the body cloth M and the rim cloth B conveyed to the cutting start position. Operation process for forming a linear slit S to the cutting end position from the cutting start position was start drive of Tsudomesu mechanism 50 can be performed. As a result, a corner break V having a shorter distance D1 or D2 in the cloth feeding direction F than the distance L (L = H−W) from the upstream end of the center knife 51 in the cloth feeding direction to the sewing needle 41 may be formed. In addition, even when a linear cut (center cut) S having a short distance from the cutting start position to the cutting end position is formed, it is possible to facilitate the sewing of the edge stitches.

(Other)
In the present embodiment, when the center knife 51 reaches the end of the straight cut S, that is, the cutting end position, the CPU 81 stops the knife motor 57 via the driver 57a to stop the center knife 51 in the upper position. However, for example, when the center knife 51 reaches the end of the cut S, the solenoid valve 69 is switched via the driver 69a, and the air cylinder 65 is held in the protruding position, so that the center knife 51 is driven to the upper position. The female motor 57 may be stopped after the seam T is formed to the end.

It is a perspective view which shows the schematic structure of the whole edge stitch sewing machine. It is a perspective view of a needle up-and-down movement mechanism. It is a perspective view of the cutting state of a moving knife mechanism and a needle up-and-down moving mechanism. It is a perspective view of the cutting regulation state of a moving knife mechanism and a needle up-and-down moving mechanism. FIG. 5 is a perspective view of the moving knife mechanism viewed from a direction different from that in FIGS. 3 and 4. It is a top view of a binder. It is a perspective view of a binder. 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 positional relationship of a sewing needle and a center knife. It is a time chart which shows operation | movement of a bead stitch sewing machine. It is a flowchart which shows the operation | movement at the time of sewing of a bead stitch sewing machine. FIG. 12 (A) is an explanatory view showing the position of the center knife at the time of the final needle with respect to the ball edge cloth and the body cloth, and FIG. 12 (B) is the first cutting of the center knife with respect to the ball edge cloth and the body cloth. It is explanatory drawing which shows the positional relationship of the sewing needle in. It is explanatory drawing which shows the positional relationship of the sewing needle at the time of the first cutting | disconnection of the center knife with respect to the ball edge cloth and body cloth in the case of H <K-D1. It is explanatory drawing which shows the position of the sewing needle in the termination | terminus time point of the center cut S with respect to the ball margin cloth and body cloth in the case of D2> H-W. It is explanatory drawing which shows the positional relationship of the sewing needle at the time of the first cutting | disconnection of the center knife with respect to the ball edge cloth and the body cloth in the case of H> K-D1. It is explanatory drawing which shows the position of the sewing needle in the termination | terminus time point of the center cut S with respect to the ball edge cloth and the body cloth in the case of H> K-D1. It is a top view which shows the structure of the circumference | surroundings of the two needles in the conventional bead stitch sewing machine. It is explanatory drawing which shows the relationship of the linear cut | interruption by a center knife, the cut | interruption by a corner knife, and the arrangement | positioning of the seam by two needles.

Explanation of symbols

10 Sewing machine 20 Large presser feed mechanism (cloth feed mechanism)
23 Presser motor (feed drive means)
30 Binder 31 Bottom plate portion 32 Standing plate portion 33 Guide member 34 Vertical guide portion 40 Needle up / down movement mechanism 41 Sewing needle 45 Sewing spindle motor 50 Moving knife mechanism (center knife mechanism)
51 Center knife 57 Female motor (another drive source)
65 Air cylinder 80 Operation control means 81 CPU
85 Setting switch (setting input means)
86 Numeric keypad (setting input means)
90 Corner knife mechanism 91 Corner knife

Claims (1)

A needle up-and-down movement mechanism that forms two straight seams in parallel using two sewing needles by a sewing machine spindle motor;
One of the standing plate portions includes a bottom plate portion and a standing plate portion standing vertically from the bottom plate portion and disposed along the cloth feeding direction above the body cloth placed on the sewing machine table. A binder that guides to the needle drop position of each sewing needle while keeping the ball cloth from the side surface to the other side surface through the bottom plate portion,
A cloth feed mechanism for feeding the garment cloth and the rim cloth along the binder toward the needle drop position of each sewing needle by a feed driving means separate from the sewing machine spindle motor;
A center knife that form a straight cut between the disposed the cloth feeding direction downstream side of the needle, the two straight seam,
A female motor as a drive source for the vertical movement of the center knife;
A connection mechanism comprising a first link body and a second link body, and connecting the female motor and the center knife;
An air cylinder that moves a connection point between the first link body and the second link body, and switches between an operating state and a restrained state of the center knife;
A corner knife mechanism for forming a cut from both ends of the straight cut to the ends of the two straight stitches,
The stitch length of the two straight stitches, the distance from the vertical movement start position of the sewing needle to the cutting start position by the center knife, and the distance from the downstream end in the cloth feed direction of the center knife to the sewing needle a setting input section for setting input data including bets,
It said determined based on the set input, a distance from the cutting start position to the end portion of the straight seam, than the distance along the cloth feeding direction to the needle from the cloth feeding direction downstream end of the center knife when is short, the two sewing before Symbol main shaft motor after completion of sewing by needle is stopped, when the body cloth and the Welt cloth by driving the feed drive means reaches the cutting start position by the center knife The driving of the scalpel motor is started while driving the feed driving means with respect to the body cloth and the rim cloth conveyed to the cutting start position, and a straight cut from the cutting start position to the cutting end position is started. along with the form,
When the distance from the cutting start position to the end portion of the straight seam is longer than the distance along the cloth feeding direction from the downstream end of the center knife in the cloth feeding direction to the sewing needle, the body cloth and the The conveying distance of the ball edge cloth is along the distance from the vertical movement start position of the sewing needle to the cutting start position by the center knife and the cloth feeding direction from the downstream end of the center knife in the cloth feeding direction to the sewing needle. An edge stitch sewing machine comprising: a cutting control means for starting driving of the knife motor and starting the vertical movement of the center knife when reaching a value obtained by adding the distance .

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