JP4292507B2 - Automatic knit placket sewing machine - Google Patents

Description

  The present invention relates to an industrial sewing machine capable of automatically performing so-called “front stitching” for forming an open collar portion of a knit product (for example, a polo shirt).

  As shown in FIG. 13, first, the knitted product is stitched with a small cloth piece 15b on the lining side of the main cloth piece 15a, which is the front body, and the two pieces of cloth to be sewn 15 overlapped. A predetermined position is sewn to form two sewing lines. Then, after incising from the end of the cloth to be sewn 15 between the two sewn lines, the small cloth piece 15b is turned to the front side of the main cloth piece 15a, and they are turned into the middle surface, The left and right mating surfaces of the open collar are formed.

  Conventionally, there is no industrial sewing machine that can automatically perform all of this knit placket sewing, and a single-needle sewing machine having one needle and one hook corresponding thereto, and two needles and corresponding ones. There was a two-needle sewing machine with a shuttle mechanism.

  However, in the conventional single-needle sewing machine, when forming two sewing lines, it is necessary to sew by changing the direction of the cloth 15 to be sewn one by one in accordance with the sewing direction. Alignment is also necessary, and the work is complicated and expensive.

On the other hand, in the conventional two-needle sewing machine, since the needle width and hook width of the two needles are set to be constant, the sewing line by the two needles can be sewn only at equal intervals. When a knitted product is sewed upright with a two-needle sewing machine, when the sewn cloth 15 is turned inside, a so-called "dimple" is formed in the lower part of the open collar, resulting in poor quality. It may become a knit product. For this reason, when performing a placket stitching of a knitted product, the sewing machine sews part of the two pieces of cloth (the cloth to be sewn 15) halfway, and the sewing line gradually narrows from the middle. As such, it has to be hand-sewn, which is very complicated and expensive. Japanese Unexamined Patent Publication No. 2000-288277 is disclosed as a related technology.
JP 2000-288277 A

  Therefore, the problem to be solved by the present invention is that, in the conventional single-needle sewing machine, the work is hand-sewn, which is very complicated and expensive. In addition, in the conventional two-needle sewing machine, a dimple is formed at the bottom of the open collar, and since all sewing operations cannot be performed automatically, it is necessary to sew by hand, as with a single-needle sewing machine. The work is complicated and expensive.

  Accordingly, the present invention has been made in view of the above problems, and its purpose is to reduce the time and labor of sewing by hand sewing to improve the sewing work efficiency and reduce the sewing cost, and to make a knitted product placket. It is to provide an automatic knit placket sewing machine that can automatically perform sewing with high quality.

  The automatic knitting placket sewing machine according to the first aspect of the present invention will be described with reference numerals used in the drawings. The automatic knitting placket having two needles 12 and 13 that move up and down on the sewing machine body 10. The sewing machine 100 includes a pair of left and right carriages 20 connected to a means for moving the sewing machine body 10 in the front-rear direction and a means for moving up and down in the up-down direction. It has a cloth presser 31 that presses down the cloth 15 to be sewn on the table 14 when the carriage 20 is lowered, and a cloth presser movable body 30 that includes means for widening the facing distance between the cloth pressers 31. However, it has characteristics.

  “Enlarging the facing distance” means increasing the distance A formed between the two cloth pressers 31 attached to the front ends of the pair of left and right carriages 20 as indicated by arrows in FIG. It means narrowing. The cloth presser movable body 30 may be any one that can pull or loosen the cloth to be sewn 15 by widening or narrowing the facing interval. It does not have to be so narrow that it disappears.

  That is, according to this, as shown in FIGS. 4 to 7, the sewing machine 100 reduces the interval of the cloth pressing movable body 30 by means of widening the facing interval and automatically lifts the carriage by means of raising and lowering during automatic placket sewing. 20 is lowered to press the cloth, and then the cloth to be sewn 15 is sewn in a state where the cloth pressing movable body 30 is widened by means of widening the opposing gap and a part of the cloth 15 is pulled. . When sewing is performed in a state where a part of the cloth to be sewn 15 is pulled as described above, and the tension of the cloth to be sewn 15 by the cloth pressing movable body 30 is released after the sewing, the cloth to be sewn is as shown in FIG. No. 15 is sewn at an interval where the sewn interval of the expanded portion is narrower than the normal interval. In addition, a sewing line having a normal interval is formed in a portion that is not pulled, and a sewing line that is gradually narrowed is formed in the pulled portion. As a result, it is possible to easily and easily sew so that the interval between the sewing lines of the sewing cloth 15 is gradually narrowed in the sewing direction without changing or adjusting the distance between the two needles 12 and 13. Efficient and low-cost stitching of knitted products.

  The automatic knit placket sewing machine according to the invention described in claim 2 is the automatic knit placket sewing machine according to the invention described in claim 1, in which “the carriage 20 is moved from the rear to the front of the sewing machine body 10 and the cloth presser is moved. The interval between the movable bodies 30 is once narrowed, the carriage 20 is lowered in the direction of the table 14 by means of moving the carriage 20 up and down, and the sewing cloth 15 is pressed by the carriage 20 and the cloth pressing movable body 30, and then the cloth pressing The interval between the movable bodies 30 is widened, and the carriage 20 is moved from the front to the back of the sewing machine body 10 in the sewing direction, so that the interval between the sewing lines formed on the cloth 15 is gradually narrowed in the sewing direction. It is characterized by the fact that it includes a control unit 40 that performs sewing while it is being sewn.

  That is, the sewing machine body 10, the carriage 20, the cloth pressing movable body 30, and the like are driven and controlled by the control unit 40, and the sewing formed on the sewing cloth 15 without changing the needle width and hook width of the sewing machine body 10. Sewing is performed while the interval between the lines is gradually narrowed in the sewing direction. Thereby, it can sew so that the space | interval of the sewing line of the to-be-sewn cloth 15 may become narrow gradually in a sewing direction by automatic control, and it can sew the knitting product upright stitching efficiently and at low cost.

  The automatic knit placket sewing machine according to the invention described in claim 3 is an automatic knit placket sewing machine according to the invention described in claim 1 or 2, wherein the center cut knife moves up and down together with the two needles 12 and 13. 50 ”.

  That is, the center cut knife 50 is a cut knife that cuts between the two sewing lines in parallel with the sewing line from one end of the sewing cloth 15. For example, the center cut knife 50 is attached to the needle bar 11 by attaching two needles 12 and 13 and is moved up and down together with the two needles 12 and 13. Thereby, the center of two sewing lines can be cut | disconnected simultaneously while carrying out the main sewing of the to-be-sewn cloth 15. Furthermore, by moving up and down together with the two needles 12 and 13, the air cylinder that operates the center cut knife 50 independently can be deleted, and special controls such as the operation timing and operation speed of the air cylinder are deleted. can do.

  The automatic knitting placket sewing machine according to the invention described in claim 4 is the automatic knitting placket sewing machine according to any one of claims 1 to 3, wherein "the table is in front of the two needles 12, 13". It is characterized by the fact that it has a V-cut knife 60 that moves up and down in 14 directions.

  That is, as shown in FIG. 12, the V-cut knife 60 can be moved up and down in front of the two needles 12 and 13, and is lowered onto the sewing cloth 15 from above to reach a predetermined position of the sewing cloth 15. A cut is made. As a result, the two needles 12 and 13 try to make a cut before the main sewing is performed.

  The automatic knit placket sewing machine according to the invention described in claim 5 is the automatic knit placket sewing machine according to the invention described in claim 4, wherein “the carriage 20 after the interval between the cloth presser movable bodies 30 is once narrowed. The V-cut knife 60 is moved up and down before the sewing machine 15 is lowered in the direction of the table 14 and the sewing cloth 15 is pressed by the carriage 20 and the cloth pressing movable body 30.

  That is, the operation timing of the V-cut knife 60 is one characteristic in that a cut is made by the V-cut knife 60 before the sewing cloth 15 is sewn and before the cloth pressing movable body 30 presses the sewing cloth 15. It is what has. Thus, when the cloth pressing movable body 30 is driven to widen the interval, a notch is formed in a predetermined portion of the sewing cloth 15, and the cloth pressing movable body 30 that pulls the sewing cloth 15 is formed. The driving force can be reduced.

  According to the automatic knit placket sewing machine according to the first aspect of the present invention, the automatic knit placket sewing machine is provided with two needles that move up and down in the sewing machine body, and is moved in the front-rear direction of the sewing machine body. A pair of left and right carriages connected to the means and a means for raising and lowering in the vertical direction; a cloth presser provided to face the tip of each carriage and holding the cloth to be sewn on the table when the carriage is lowered; And a cloth presser movable body comprising means for widening the opposing spacing of the cloth pressers, so that sewing is performed while gradually reducing the interval between the sewing lines formed on the cloth to be sewn in the sewing direction. Therefore, it is possible to reduce the time and labor of sewing by hand-sewing that is gradually narrowly sewn, so that the efficiency of sewing work can be improved and the sewing cost can be reduced. There is an effect that can be performed in a quality well automatic sewing Te.

  According to the automatic knit placket sewing machine according to the second aspect of the present invention, in addition to the effect of the automatic knit placket sewing machine according to the first aspect, the carriage is moved from the rear to the front of the sewing machine body. The distance between the cloth pressing movable bodies is once narrowed, the carriage is lowered in the table direction by means of raising and lowering the carriage, and the cloth to be sewn is pressed by the carriage and the cloth pressing movable body, and then between the cloth pressing movable bodies. And a control unit that sews the carriage while moving the carriage in the sewing direction from the front to the back of the sewing machine main body to gradually reduce the interval between the sewing lines formed on the cloth to be sewn in the sewing direction. As a result, automatic control can be performed with relatively simple control, and the control can be easily changed.

  According to the automatic knit placket sewing machine according to the invention described in claim 3 of the present application, in addition to the effect exhibited by the automatic knit placket sewing machine according to claim 1 or 2, the center cut knife that moves up and down together with two needles Therefore, it is possible to reduce the manufacturing cost of the sewing machine by reducing the mechanism for moving the center cut knife up and down, and to cut simultaneously while sewing the cloth to be sewn, so that the work efficiency is good.

  According to the automatic knit placket sewing machine according to the invention described in claim 4 of the present application, in addition to the effect exhibited by the automatic knit placket sewing machine according to any one of claims 1 to 3, the table is provided in front of the two needles. Since the V-cut knife moving up and down in the direction is provided, there is an effect that the V-cut knife can be lowered and the cut cloth can be cut before the sewing cloth is finally sewn.

  According to the automatic knit placket sewing machine according to the invention of claim 5 of the present application, in addition to the effect of the automatic knit placket sewing machine according to any one of claims 1 to 4, the interval between the cloth presser movable bodies After the carriage is lowered, the V-cut knife 60 is moved up and down before the carriage is lowered in the table direction and the fabric to be sewn is pressed by the carriage and the cloth holding movable body, so that the movable force of the cloth holding movable body can be reduced. The driving force and driving amount of the cloth-pressing movable body can be reduced, and there is an effect that it can be automatically controlled by a relatively simple control.

  The best mode for carrying out the present invention will be described based on an embodiment with reference to the drawings. The sewing machine of the present embodiment is an example of an industrial sewing machine that automatically stitches a knitted product in advance, and FIG. 1 is a diagram showing the appearance of an industrial sewing machine that includes two needles according to the present invention. FIG. 2 is a perspective view of the automatic knit placket sewing machine as viewed from the side.

  The sewing machine 100 includes a sewing machine body 10, a carriage 20, a cloth presser movable body 30, a control unit 40, a center cut knife 50, a V cut knife 60, and a marker 70. And the sewing machine 100 of this embodiment has controlled the carriage 20, the cloth presser movable body 30, the center cut knife 50, and the V cut knife 60 by the control part 40, and has stretched the near side of the cloth 15 to be sewn. The sewing line is sewn, and the interval between the sewing lines is gradually narrowed in the sewing direction, and the space between the two sewing lines is cut.

  The sewing machine body 10 has a well-known configuration, and two needles 12 and 13 are fixed to a needle bar 11 with a fixed needle width and are supported up and down toward the table 14. On the other hand, the shuttle mechanism is provided on the table 14 at a lower portion of the needle bar 11 and fixed to a constant width corresponding to the needle width of the two needles 12 and 13. Further, a champon 16 called a so-called thread tension is provided on the front surface of the sewing machine body 10. This champon 16 adjusts the tone of the yarn, and is formed in the shape of two dishes, as in the prior art, and closes the interval between them to tension the yarn, and conversely the interval It is opened to loosen the thread tension.

  In addition, the sewing machine main body 10 is provided with a best time sensor 17 for detecting the best time position of the sewing cloth 15. The best viewing sensor 17 is composed of a photoelectric sensor composed of a pair of light projecting / receiving devices which are shielded by the cloth 15 being fed and passed through, for example. It is provided in front of the needles 12 and 13. The light receiver is provided on the table 14 substantially below the two needles 12 and 13 so that the best position of the sewing cloth 15 can be detected from the shield of the best time sensor 17. The position detected by the best time sensor 17 is a position where the sewing cloth 15 has moved to almost the lower part of the two needles 12 and 13. The table 14 does not have a feed dog for moving the sewing cloth 15, and a carriage 20 described later moves the sewing cloth 15 in the sewing direction by the sewing cloth 15.

  The carriage 20 is composed of two rods having a substantially L-shaped cross section having a predetermined length, and is arranged on the left and right of the two needles 12 and 13 so as to be movable back and forth in the sewing direction. A means for moving the carriage 20 in the front-rear direction of the sewing machine body 10 and a means for raising and lowering the carriage 20 are provided behind the sewing machine body 10. The means for moving the sewing machine main body 10 in the front-rear direction includes a motor for moving the carriage 20 in the front-rear direction of the sewing machine main body 10 and a belt wound in the front-rear direction driven by this motor. The carriage 20 is connected to the means for moving in the front-rear direction, and the carriage 20 moves from the rear to the front of the sewing machine body 10 or from the front to the rear by driving the motor forward or backward. To do. At that time, the control unit 40 allows the carriage 20 to move with the origin slightly behind the two needles 12 and 13.

  The means for raising and lowering the carriage 20 includes an air cylinder and a member attached to the air cylinder for raising and lowering the carriage 20 by a “leverage action”. The carriage 20 is raised and lowered by means for raising and lowering the carriage 20. Thus, the carriage 20 can move back and forth as described above and can move up and down. When the carriage 20 is lowered, the carriage 20 presses the sewing cloth 15 from above, and the cloth 20 can be fed as the carriage 20 moves in the front-rear direction. Further, when the carriage 20 is raised upward, the press of the cloth to be sewn 15 is released, and the cloth feed is also released.

  The cloth presser movable body 30 is provided so as to face the front ends of the left and right carriages 20 and presses the cloth 15 to be sewn on the table 14, and the air cylinder 32 widens the facing distance between the cloth pressers 31. It consists of. The air cylinders 32 are attached to the front end portions of the left and right carriages 20 so as to face each other, and the cloth pressers 31 are attached to the front end portions of the respective air cylinders 32 so as to be movable left and right. The cloth presser 31 is formed in a bar shape having a predetermined length and a substantially L-shaped cross section. The predetermined length of the cloth presser 31 is set to a length sufficient for a predetermined length for sewing the sewing cloth 15 narrowly. Further, the bottom surface of the cloth presser 31 is provided with anti-slip means so as to prevent slipping with the sewing cloth 15. The air cylinder 32 is driven by the control unit 40 and operates the cloth presser 31 in the left-right direction to widen or narrow the interval between the cloth presser movable bodies 30.

  The control unit 40 is configured by a control unit such as a microcomputer, and is controlled to execute a predetermined operation described later based on a program separately stored in a storage unit (not shown). The control unit 40 includes a power button 41 that is a power on / off button, an operation panel having an enter button 42 for confirming processing, a foot SW (switch) provided under the foot of the sewing machine body 10 (FIG. (Not shown), an emergency stop SW (switch) (not shown) provided on the table 14, and a display (display unit) 43 for displaying a processing status or an error message. The final output stage of the present embodiment such as the carriage 20, the cloth pressing movable body 30, the center cut knife 50 or the V cut knife 60 is air-controlled by an electronic valve.

  As shown in FIG. 2, the center cut knife 50 is used to make a cut in parallel with the sewing line between the two sewing lines of the sewing cloth 15. It is arrange | positioned back and is attached to the sewing machine main body 10 via the air cylinder, and is moved up and down from the sewing machine main body 10 toward the table 14 between the left and right carriages 20.

  The V-cut knife 60 is a cut knife that supplements the center cut knife 50. That is, the lower portion of the sewing line of the sewing cloth 15 is the length of the space existing between the two needles 12 and 13 because the center cut knife 50 is attached behind the two needles 12 and 13. It compensates for the inability to cut. The attachment position of the V-cut knife 60 is behind the center cut knife 50 and is attached to the sewing machine body 10 via the air cylinder 61 so as to move up and down between the left and right carriages 20. The air cylinder 61 is controlled by the control unit 40 and is driven at a predetermined timing, and the V-cut knife 60 is dropped downward so as to make a cut at a predetermined position of the sewing cloth 15.

  The marker 70 is attached above the front surface of the sewing machine main body 10, displays a plus sign on the table 14, and can be positioned when the sewing cloth 15 is placed on the table 14. Two markers 70 are provided, and two points of a sewing start point and an end point of the open collar portion of the cloth to be sewn 15 can be displayed on the table 14. Then, the sewing manufacturer puts these two points on the table 14 together with the corresponding start and end portions of the open collar portion of the cloth to be sewn 15. Each display position of the marker 70 is matched to the sewing start point and end point set in the control unit 40.

  Next, the operation of the sewing machine 100 of the present embodiment will be described with reference to FIGS. The following shows a method for manufacturing an open collar portion of a polo shirt using the sewing machine 100 of the present embodiment. When the operator puts the sewing cloth 15 on a predetermined position on the table 14 and steps on the foot SW, the sewing process is started by a main process (not shown). The predetermined position on the table 14 on which the sewing cloth 15 is placed is displayed at the predetermined position on the table 14 by the marker 70 as described above, so that the front body can be easily and easily aligned. Has been.

  The sewing machine 100 according to the present embodiment performs the following operation under the control of the microcomputer of the control unit 40. First, the flowchart (1) of the sewing process shown in FIG. 3 will be described with reference to FIGS.

  In S10, the carriage 20 is moved to the worker side. That is, as shown in FIG. 4, the carriage 20 is moved to the operator side in front of the sewing machine body 10 to a predetermined position that is a sewing end point. The sewing end point is managed in advance as a parameter to be stored in the storage means of the control unit 40, and can be set / changed from the control panel of the control unit 40 in the flow processing of another routine.

  In S11, the interval between the cloth pressing movable bodies is narrowed. That is, the two air cylinders 32 are driven to move the two cloth pressers 31 in the direction indicated by the arrows in FIG. FIG. 5 shows a state where two cloth pressers 31 are in contact with each other and the distance between the cloth presser movable bodies 30 is narrowed. Note that the greater the amount of movement of the cloth presser 31, the more effective the pulling of the cloth to be sewn 15 is. However, it is sufficient that the interval is narrowed, and it is not always necessary to close it.

  In S12, the carriage 20 is lowered. That is, the carriage 20 is lowered in the direction of the table 14 by driving the air cylinder that moves the carriage 20 up and down in the direction indicated by the arrow in FIG.

  In S13, the interval between the cloth presser movable bodies is increased. That is, in the direction indicated by the arrow in FIG. 6, the drive of the air cylinder 32 is released and the cloth presser 31 is moved back to the position before the drive to widen the interval between the cloth presser movable bodies 30. FIG. 7 shows a state where the interval between the cloth pressing movable bodies is widened. As shown in FIG. 7, by operating the cloth presser 31 in the left-right direction with the sewing fabric 15 pressed from above, the pressed portion of the sewing fabric 15 is pulled.

  Next, flowcharts (2) and (3) of the sewing process shown in FIGS. 8 and 9 will be described. FIG. 10 shows a timing chart of the sewing process excluding the operation of the cloth presser movable body 30, and the processes of S14 to S42 described later operate at the operation timing shown in FIG.

  First, in S14 to S16, a process of adjusting the tension of the yarn is performed. That is, the yarn loosening is turned on and the yarn is loosened in S14, the so-called two-thread yarn champ 16 is closed in S15, and the yarn loosening is turned off and the yarn is tensioned in S16. To do.

  In S17, it is determined whether or not the foot SW has been stepped on. If the foot SW has been stepped on, the flow proceeds to S18 and subsequent steps. On the other hand, if the foot SW has not been stepped on, the process proceeds to S27, where the operation is stopped, the carriage 20 and the like are moved to the origin, and the sewing process is terminated.

  In S18 to S26, the sewing cloth 15 is cut while being sewn. That is, first, in S18, the carriage 20 is moved backward, and is moved to a position where the end of the cloth 15 to be sewn and fed by the carriage 20 shields the best time sensor 17. In S19, it moves to the reverse stitching start position, the guide presser is lowered in S20, and reverse stitching at the start of sewing is performed in S21. Then, the lower thread is trimmed in S22, the upper thread is released in S23, the center cut knife 50 (center knife) is lowered in S24, the middle is sewn in S25, and the reverse stitching at the end of sewing is performed in S26.

  In S28 to S30, the sewing machine body 10 after sewing is processed. That is, the center knife is raised in S28, the guide presser is turned OFF in S29, and the champon 16 is opened to loosen the yarn tension.

  In S31 to S32, the open collar portion of the polo shirt that could not be cut with the center cut knife 50 is cut. That is, in S31, the carriage 20 is further moved to the rear V-cut position, and in S32, the air cylinder 61 is driven to move the V-cut knife 60 up and down to make a cut in the sewing cloth 15.

  In S33 to S40, the sewing fabric 15 after sewing is sent from the table 14 to the next step, and the sewing machine body 10 and the carriage 20 are moved to the origin to complete the sewing process. That is, the carriage 20 is moved to the rear end position in S33, the stacker clamp roller is turned on in S34 to hold the sewing fabric 15, the carriage 20 is raised upward in S35, and the stacker feed roller is moved for the parameter time in S36. The drive is turned on and the sewing cloth 15 is sent downward from the table 14. In S37, the carriage 20 starts to move to the origin. In S38, the stacker clamp arm that scoops the cloth to be sewn 15 is turned on. In S39, the stacker swing arm that swings the stacker clamp arm is driven on. The cloth 15 is sent to the next process. Further, in S40, the carriage 20 is completely moved to the origin, and the sewing process is completed.

  According to this, as shown in FIG. 11, the sewing machine 100 has a constant needle width of the two needles 12 and 13 and a hook width of the hook mechanism. The predetermined length of 15 predetermined positions can be sewn in a state where the interval between the sewing lines is narrowed. Further, the interval between the sewing lines is a predetermined length from one end of the cloth to be sewn 15 and is sewn at a predetermined interval of the two needles 12 and 13, and a portion pressed by the cloth pressing movable body 30 is the predetermined interval. When the pulling is released by pulling the sewing cloth 15 in the left-right direction with the cloth pressing movable body 30, the cloth to be sewn 15 is pulled. It returns to its original position and is sewn at a narrower interval than the portion that is not pulled.

  That is, as described above, the cloth retainer 31 of the cloth retainer movable body 30 attached to the tip of the carriage 20 abuts and presses the cloth to be sewn 15 from above on the front side of the sewing machine body 10. Is driven by the air cylinder 32 and the cloth pressing movable body 30 is widened to expand a predetermined portion of the cloth 15 to be sewn. The interval between the sewing lines of the cloth 15 can be gradually narrowed in the sewing direction. Further, the sewing work is simple and easy only by stepping on the foot SW, and the sewing machine main body 10 is not adjusted. Therefore, an engineer having specialized knowledge is not required, and the sewing cloth 15 Can be sewn so that the interval between the sewn lines gradually becomes narrower in the sewing direction, and the open collar portion of the knit product can be sewn efficiently and at low cost.

  Further, by providing the marker 70, the sewing cloth 15 can be accurately placed on the table 14, and the sewing cloth 15 can be positioned easily and easily.

  Therefore, according to the sewing machine 100 of the present embodiment, the open collar portion of the sewing fabric 15 can be formed fully automatically.

  Next, another embodiment will be described. In the sewing machine 100 according to the second embodiment, a center cut knife 50 is attached to the needle bar 11, and the sewing cloth 15 is cut as the two needles 12 and 13 move up and down.

  Therefore, since the sewing machine 100 includes the center cut knife 50 that moves up and down together with the two needles 12 and 13, a mechanism such as an air cylinder that moves up and down the center cut knife 50 can be eliminated. Manufacturing cost can be reduced. Further, the above-described processing of S24 shown in FIG. 8 for controlling the mechanism can be reduced. Further, the sewing cloth 15 can be cut at the same time while sewing, so that the work efficiency is good.

  Next, another embodiment will be described with reference to FIG. In the sewing machine 100 according to the third embodiment, the attachment position and cutting timing of the V-cut knife 60 and the air cylinder 61 that moves the V-cut knife 60 up and down are different. That is, the mounting position of the V-cut knife 60 and the air cylinder 61 is behind the two needles 12 and 13 in the first or second embodiment, but in the third embodiment, as shown in FIG. 13, an air cylinder 61 is attached to the sewing machine body 10 so as to be positioned in front of the machine 13, and when the air cylinder 61 is driven, the V-cut knife 60 is moved up and down. The control timing of the V-cut knife 60 and the air cylinder 61 is after the sewing cloth 15 is sewn as shown in FIGS. 9 and 10 in the first embodiment, but in the third embodiment, S31 and S31 shown in FIG. The process of S32 is a process between S11 and S12 shown in FIG.

  Accordingly, when the cloth presser movable body 30 is driven to widen the interval, a cut is formed in a predetermined portion of the cloth to be sewn 15, and the cloth presser movable body that pulls the cloth to be sewn 15 is formed. The driving force of 30 can be reduced. Further, if the driving force of the cloth presser movable body 30 is small, the weight of the cloth presser movable body 30 itself can be reduced lightly, the deflection of the carriage 20 can be prevented, and mechanisms such as the deflection prevention of the carriage 20 can be eliminated. Can do.

  The present invention has been described above based on the embodiments. However, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention.

  For example, the control unit may be configured by control means such as relay sequence control, and may be controlled to execute the predetermined operation based on a sequence for controlling air at a predetermined time by a relay or the like.

It is a perspective view which shows the sewing machine of a present Example. It is the perspective view which looked at the sewing machine of the said Example from the side. It is a flowchart (1) which shows operation | movement of the sewing machine of the said Example. It is a perspective view which shows the state which moved the carriage ahead of the sewing machine main body. It is a perspective view which shows the state which narrowed the space | interval between cloth presser movable bodies. It is a perspective view which shows the state which lowered the carriage and the cloth pressing movable body, and made it contact | abut to the to-be-sewn cloth. It is a perspective view which shows the state which expanded the space | interval between cloth presser movable bodies. It is a flowchart (2) which shows operation | movement of the sewing machine of the said Example. It is a flowchart (3) which shows operation | movement of the sewing machine of the said Example. It is a timing chart which shows operation | movement of the sewing machine of the said Example. It is a top view which shows the state which sewn the to-be-sewn cloth using the sewing machine which concerns on this invention. 10 is a perspective view showing a sewing machine according to Embodiment 3. FIG. It is explanatory drawing which shows a mode that the open collar part of a polo shirt is formed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Sewing machine body 11 Needle bar 12, 13 Needle 14 Table 15 Cloth to be sewn 16 Champon 17 Look sensor 20 Carriage 30 Cloth presser movable body 31 Cloth presser 32 Air cylinder 40 Control part 50 Center cut knife 60 V cut knife 61 Air cylinder 70 Marker 100 Sewing machine for automatic knit

Claims (5)

An automatic knit placket sewing machine with two needles that move up and down on the machine body,
A pair of left and right carriages coupled to a means for moving the sewing machine body in the front-rear direction and a means for moving it up and down;
A cloth presser movable body which is provided to face the front end of each carriage and which includes a cloth presser for pressing the cloth to be sewn on the table when the carriage is lowered, and a means for widening the facing interval between the cloth pressers; ,
An automatic knitting placket sewing machine characterized by comprising:   The carriage is moved from the back to the front of the sewing machine body, the interval between the cloth pressing movable bodies is once narrowed, the carriage is lowered in the table direction by means of raising and lowering the carriage, and the cloth and the cloth pressing movable body are sewn. After that, the interval between the cloth holding movable bodies is widened, and the carriage is moved in the sewing direction from the front to the back of the sewing machine main body so that the interval between the sewing lines formed on the sewing cloth is gradually increased in the sewing direction. 2. The automatic knitting placket sewing machine for automatic knit according to claim 1, further comprising a control unit that performs sewing while narrowing the sewing machine.   The front-stitch sewing machine for automatic knit according to claim 1 or 2, further comprising a center cut knife that moves up and down together with two needles.   The self-knitting front stitch sewing machine according to any one of claims 1 to 3, further comprising a V-cut knife that moves up and down in the table direction in front of two needles.   5. The V-cut knife is moved up and down after the interval between the cloth pressing movable bodies is once narrowed and then the carriage is lowered in the table direction and before the cloth and the cloth pressing movable body press the cloth to be sewn. The self-knitting placket sewing machine as described.

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