JP4842312B2 - Buttonhole sewing machine - Google Patents

Description

  The present invention relates to a buttonhole sewing machine that forms buttonhole stitches around buttonholes that are cut and formed on a workpiece.

  With a typical buttonhole sewing machine, before or after the cloth cutting knife is dropped on the workpiece and the buttonhole is formed, the side stitches formed on both sides along the buttonhole and the side stitches are continuous. A buttonhole stitch is formed by forming a tacking stitch at one or both ends of the buttonhole.

  In addition, when forming a buttonhole overhang with a household sewing machine, straight stitches are formed along the buttonhole in the side stitch forming portion before forming the side stitch, so that the buttonhole overhang is given a texture. .

  There is also known a thread tension adjusting device that uses an electric drive means such as a solenoid or a voice coil motor to change the thread tension of the thread tensioner during sewing.

Japanese Patent Laid-Open No. 10-165676 JP 09-084976 A

  However, when this buttonhole stitch is formed on a thick fabric such as wool gab or a new fabric such as a recent shape memory fabric, it is cut by a cloth cutting knife due to the fiber formation characteristics of the fabric. After the fibers perpendicular to the button hole forming direction of the fabric were cut, it became easy to come off from the buttonhole stitching and unravel, resulting in a disadvantage that the quality of the product was lowered.

  And even if the straight stitch is formed before the side stitch is formed like the above-mentioned household sewing machine, it does not reinforce the fiber perpendicular to the button hole, and causes the same disadvantages as described above. It was.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a buttonhole sewing machine that beautifully finishes buttonhole stitching without being affected by fabric.

In order to solve the above problem, the invention according to claim 1
Stitch formation to form a pair of side stitching along the sides of the buttonhole to be incised formed on the workpiece, and Me bar tacking continuous on both sides stitching located at at least one end side of the buttonhole, the buttonhole darning stitches by In a buttonhole sewing machine with means,
Before forming the buttonhole stitch, when forming a lap stitch that repeats a plurality of reinforced stitches formed by zigzag stitching or linear stitching, which is narrower than the side stitching portion, a plurality of times of reinforced stitching is reinforced. An operation panel for setting a lateral shift amount when the sewing start point needle drop position is moved in a direction perpendicular to the button hole with respect to the start stitch needle drop position of the previous reinforcing stitch;
Control means for forming the overlapped stitches at the position where the side stitches and the both-side stitches are formed so as to prevent the needle from falling at the same point based on the amount of lateral deviation set by the operation panel. It was configured to include.

The invention according to claim 2 is the buttonhole sewing machine according to claim 1,
The control means has different pitches of the reinforcement stitches of each of the overlap stitches that repeat a plurality of times of the reinforcement stitches formed by zigzag stitching or linear stitching that is narrower than the side stitches before the buttonhole stitches are formed. The configuration.

The invention according to claim 3 is the buttonhole sewing machine according to claim 1,
The control means has a configuration in which the width of each of the reinforcement stitches of the overlap stitch that repeats the reinforcement stitch formed by zigzag stitching having a narrower width than the side stitching portion a plurality of times before the buttonhole stitch is formed is different. .

  According to the present invention, before forming a buttonhole stitch, overlap stitching that repeats multiple times of zigzag stitching or linear stitching that is narrower than the side stitching portion is repeated so that the needle does not fall to the same point. Since it is formed at the position where the tacking is formed continuously to the side stitching and the both side stitching, it is possible to eliminate ground thread breakage, poor sewing, and the like, and to greatly improve the quality of the sewing product.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The details of the sewing machine structure and the method of forming buttonholes are described in Japanese Patent Application Laid-Open No. 11-9859 as an invention previously filed by the present applicant. explain.

  1 to 3, 1 is a sewing machine that forms a buttonhole seam around a buttonhole by a main stitch, 5 is a main motor of the sewing machine, 6 is an upper shaft, 7 is a crank mechanism, 8 is a needle bar, 9 is a needle, 10 is a vertical shaft, 11 is a lower shaft, 12 is a hook, 13 is a bobbin case, 14 is a cloth holding plate, 15 is a cloth presser, 16 is a cloth cutting knife, 17 is a feed motor, 18 is a needle bar swing Pedestal, 30 is a cloth cutting knife lowering cylinder, 40 is a base line motor (first electric driving means), 41 is a swing width motor (second electric driving means), and 42 is a needle swinging mechanism (baseline changing mechanism and needle). Swing width changing mechanism).

  As shown in the figure, the sewing machine 1 includes a bed 2 having a flat bed surface on the upper surface, a vertical body portion 3 standing on one end side of the bed 2, and a substantially parallel to the bed 2 from the vertical body portion 3. And an arm 4 extending along the side, and substantially U-shaped in a side view.

  In the sewing machine 1 described above, the main motor 5 is provided at the end of the vertical drum portion 3 side, and the upper shaft 6 that is rotated by driving of the main motor 5 is disposed in the arm 4. A needle bar 8 is connected to the part through a crank mechanism 7 so as to be movable up and down, and a needle 9 is attached to the lower end of the needle bar 8.

  In addition, a vertical shaft 10 is disposed in the vertical body portion 3, and a lower shaft 11 is disposed in the bed 2, and a bobbin case 13 is attached to a hook 12 at the tip of the lower shaft 11. The vertical shaft 10 has an upper end connected to the upper shaft 6 via bevel gears 6a and 10a, and a lower end connected to the lower shaft 11 via bevel gears 10b and 11a.

  Further, the needle bar 8 is incorporated in the needle bar rocking base 18 so as to be slidable up and down. The needle bar swinging base 18 is swingable about a swing fulcrum shaft 18a parallel to the upper shaft 6 at the upper end.

  A movable cloth holding plate 14 is disposed on the bed 2. Above the cloth holding plate 14, a cloth presser 15 using a frame-shaped clamp body and a cloth cutting knife 16 which is a vertically moving knife. Is arranged. The cloth cutting knife 16 is moved up and down by driving means such as a solenoid and an air cylinder. Further, the cloth holding plate 14 and the cloth presser 15 are configured to feed the cloth by reciprocating along the upper shaft 6 on the bed 2 while the cloth is nipped by driving the feed motor 17.

  As shown in FIG. 2, a base line motor 40 as a first electric driving means for determining a reference position of the needle bar swing base 18 and a swing width are determined at the end of the sewing machine 1 on the vertical drum section 3 side. Swing width motors 41 as second electric drive means are arranged in parallel, and a needle swing mechanism 42 as a base line changing mechanism and a needle swing width changing mechanism is configured from each output shaft to the needle bar swing base 18. Has been.

  The output shafts of the base line motor 40 and the swing width motor 41 are provided with pinions 40a and 41a, respectively. The sector gear 43d of the base line arm 43 and the sector gear 55d of the swing width arm 55 are meshed with the pinions 40a and 41a, respectively. It has become a state. 2 and 3, the needle swing mechanism 42 includes a base arm 43, a base lever 44, a connecting link 45, a needle swing cam lever 46, a needle swing lever 47, a connecting shaft 48, a needle swing arm 49, a needle swing cam. 54, a swing arm 55, a swing lever 56, and the like.

  The base line arm 43 includes a rotary shaft 43a that is rotatably held while penetrating the sewing machine 1, a gear portion 43b having a base gear side fixed to one end of the rotary shaft 43a and having a sector gear 43d on the free end side, and a rotary shaft. 43a is formed of a bifurcated portion 43c having a proximal end fixed to the other end of 43a, and these portions rotate integrally with the rotation shaft 43a as an axis as the baseline motor 40 is driven.

  Then, outside the sewing machine 1, the sector gear 43d of the base arm 43 is engaged with the pinion 40a. On the other hand, inside the double arm 43c of the base arm 43 inside the sewing machine 1, the end of the bifurcated base lever 44 is also provided. Are pivotably connected by a horizontal pin 44a. In the bifurcated portion of the base line lever 44, one end of the connecting link 45 is swingably connected by a horizontal pin 44b, and the needle swing cam lever 46 is swingably connected to the other end of the connecting link 45 by a horizontal pin 45a. is doing.

  Further, the tip end portion of the needle swing lever 47 is connected to the lower end portion of the needle swing cam lever 46 by a horizontal pin 46a so as to be swingable. A proximal end portion of the needle swing lever 47 is fixed to a proximal end portion of a connecting shaft 48 disposed in the arm 4 in parallel with the upper shaft 6. A proximal end portion of a needle swing arm 49 is fixed to the distal end portion of the connecting shaft 48, and a needle bar rocking base 18 is attached to the distal end portion of the needle swing arm 49 via a square sesame or the like (not shown). It is swingably connected.

  Here, the needle swing cam lever 46 has a cam engaging recess 46b whose upper portion is opened in a U-shape, and a needle swing cam 54 by an eccentric cam is engaged with the cam engagement recess 46b.

  The needle swing cam 54 is provided on a countershaft 53 to which rotation is transmitted from the upper shaft 6 through the reduction gears 51 and 52 at a reduction ratio of 1/2.

  Further, the swing arm 55 includes a rotary shaft 55a that is rotatably held in a state of passing through the sewing machine 1, and a gear portion 55b having a base end side fixed to one end of the rotary shaft 55a and having a sector gear 55d on the free end side. The arm portion 55c has a base end fixed to the other end of the rotation shaft 55a, and these portions rotate integrally with the rotation shaft 55a as an axis as the swing motor 41 is driven. Yes.

  Then, outside the sewing machine 1, the sector gear 55d of the swing width arm 55 is engaged with the pinion 41a. On the other hand, inside the sewing machine 1, one end of the swing width lever 56 is horizontally connected to the arm portion 55c of the swing width arm 55. The pin 56a is pivotably connected. The other end of the swing width lever 56 is swingably connected to the connection link 45 and the base line lever 44 via the horizontal pin 44b.

  A base line origin detection sensor 57 for detecting a base line position is provided in the vicinity of the sector gear 43d of the base line arm 43, and similarly, a swinging width for detecting a needle swing width is also provided in the vicinity of the sector gear 55d of the swing width arm 55. A width origin detection sensor 58 is provided. These baseline origin detection sensor 57 and swing width origin detection sensor 58 are constituted by, for example, photosensors.

  Further, a needle swinging left / right position detection sensor 59 (base line side / needle swinging side detecting means) by a magnetic sensor is disposed on one side surface of the reduction gear 52 on the sub shaft 53 side, and the speed reduction gear 52 is provided for detecting the left / right position. The magnet 52a is provided.

  By the way, the reduction gear 52 makes one rotation with respect to two rotations of the reduction gear 51 on the main shaft 6, that is, makes one rotation when the needle 9 moves up and down twice. The needle swing left / right position detection sensor 59 is opposed to the magnet 52a in a rotational phase in which the needle 9 is positioned at the upper stop position and is swung toward the base line side.

  By the needle swing mechanism 42 described above, the needle bar swinging table 18 is driven by the base line arm 43 from the base line arm 43 or the swing width arm 44 by driving the base line motor 40 and the swing width motor 41 as electric drive means. After that, through the swing width lever 56 from 55, the swing is transmitted through the connecting link 45, the needle swing cam lever 46, the needle swing lever 47, the connecting shaft 48, the needle swing arm 49 and the needle swing cam 54, respectively. The base line and the swing width are changed using the swing fulcrum shaft 18a at the upper end as a fulcrum. That is, with respect to the base line, the base line arm 43, the base line lever 44, the connection link 45, the needle swing cam lever 46, the needle swing lever 47, the connection shaft 48, the needle swing arm 49, and the needle swing cam 54 are driven by the drive of the base line motor 40 by the pulse motor. The base line is changed when the needle bar swing base 18 swings with the swing fulcrum shaft 18a at the upper end as a fulcrum. This is the baseline changing mechanism.

  As for the swing width, the swing width motor 41 is driven by the pulse motor, and the swing width arm 55, the swing width lever 56, the connecting link 45, the needle swing cam lever 46, the needle swing lever 47, the connecting shaft 48, the needle swing arm 49, The swing is transmitted through the needle swing cam 54, and the swinging width is changed by swinging the needle bar swing base 18 with the swing support shaft 18a at the upper end as a support. This is the needle swing width changing mechanism.

  Here, the needle swing mechanism 42 swings (increases) the swing width to the left with reference to the base line position. When the cam top of the needle swing cam 54 is on the base line side, the needle drop depends on the position of the base arm 43. Is determined.

  When the cam top of the needle swing cam 54 is on the cam swing width side, the needle drop is determined by the swing width amount with respect to the base line position.

  At the time of sewing, the needle swing cam 54 provided on the auxiliary shaft 53 to which the rotation is transmitted from the upper shaft 6 rotated by the drive of the main motor 5 through the reduction gears 51 and 52 rotates at a reduction ratio of 1/2. The needle swing cam lever 46 engaged with the cam engaging recess 46b reciprocally swings, and the reciprocating motion of the needle swing cam lever 46 is the needle swing lever 47, the connecting shaft 48, the needle swing arm. 49 and the needle swing cam 54 are transmitted to the needle bar rocking base 18.

  As a result, based on the change in the base line and the swing width described above, the needle bar rocking base 18 reciprocally rocks with the rocking fulcrum shaft 18a at the upper end as a fulcrum, so that the buttonhole parallel part (side stitching part) And the seam of the tacking part (tacking stitch part) is formed.

  The thread tension device A (FIG. 1) of this embodiment is provided in the arm portion 4 of the sewing machine 1 and controls the tension of the upper thread by applying tension to the upper thread.

  4 is a side view of the thread tension device A, and FIG. 5 is an exploded perspective view of the thread tension device A. FIG. As shown in FIGS. 4 and 5, the thread tension device A includes a base member 69, a pair of thread tension plates 66 and 67, a solenoid 60 that is a driving means, a movable pin 68, and a solenoid that also controls the sewing machine 1. A control circuit (not shown) for performing 60 drive control is provided.

  The thread tension trays 66 and 67 provide resistance to the upper thread by sandwiching the upper thread between a pair of tension trays (the fixed tray 66 and the movable tray 67), and the resistance during sewing by the thrust of the solenoid 60. This is a dynamic thread tension (active tension) capable of continuously changing the force.

  The screws 71, 71 are inserted into the screw insertion holes 69a, 69a of the base member 69 and the screw insertion holes 81Aa, 81Aa of the arm part frame 81A, and are screwed into the screw holes 60a, 60a of the solenoid 60. Thereby, the base member 69 is integrally fixed to the outside of the arm portion frame 81A, and the solenoid 60 is integrally fixed to the inside of the arm portion frame A81 by the screws 71 and 71, respectively.

  The movable pin 68 has a screw portion 68b on one end side and a shaft portion 68a on the other end side where the screw is not cut, and a central through hole 66a, 67a of a condition plate (a fixed plate 66 and a movable plate 67) and a base. It is inserted into the insertion hole 69 b of the member 69 and screwed into the screw hole 61 a at the tip of the plunger (movable part) 61. The fixing position of the movable pin 68 and the plunger 61 can be adjusted as appropriate by tightening the nut 70. When the movable pin 68 is fixed, it is set so that the shaft portion 68 a is positioned at the fixed plate 66 and the movable plate 67.

  The movable pin 68 is provided with a slit 68c and a threading hole 68d as guiding means, and the upper thread L is passed through the slit 68c to the threading hole 68d at the back end, and then the two pieces. It is set so that it may be pinched | interposed into the above-mentioned tone plate (the fixed plate 66 and the movable plate 67). In a state where two tone plates (the fixed plate 66 and the movable plate 67) are set, the threading hole 68d is positioned so as to overlap the pressing surface between the two tone plates (the fixed plate 66 and the movable plate 67). In addition, the entrance of the slit 68c is located away from the pressing surface. Therefore, in a state where two tension plates are set, the sewing thread does not come off from the thread tension plates 66 and 67.

  FIG. 6 is a cross-sectional view of the solenoid 60 of the thread tension device 1.

  The solenoid 60 includes a machine frame 62, a coil frame 63, a coil 64, a plunger 61, a magnetic member 65, and the like. The plunger 61 is supported by bearings 62A and 62B so as to be movable in the axial direction and not rotatable. The magnetic member 65 fixed to the plunger 61 has a cylindrical shape, and a step portion 65a for changing the diameter from the shaft center is formed in a part thereof. With this shape, a specific stroke section W (FIG. 4) in which the thrust does not depend on the stroke is obtained.

  When the energizing current is constant, the solenoid 60 can obtain a specific stroke section W whose thrust does not depend on the stroke of the plunger 61.

  In the thread tension device 1, the fixed position of the movable pin 68 and the plunger 61 can be appropriately adjusted by tightening the nut 70, but the stroke section of the plunger 61 in a state where the plunger 61 is applied to the thread tension plates 66 and 67 is The tightening position of the nut 70 is set so as to be included in the specific stroke section W. Here, the state in which the plunger 61 is applied to the thread tension plates 66 and 67 is a state in which a pair of tension plates (a fixed plate 66 and a movable plate 67) are sandwiched between the base member 69 and the movable pin 68 and are in contact with each other. This means that the upper thread is sandwiched between a pair of tone plates.

  In order to set the stroke of the plunger 61 acting on the thread tension plates 66 and 67 to the specific stroke section W, for example, the protruding amount W of the tip of the plunger 61 protruding rearward of the solenoid 60 with the nut 70 loosened. Rotate the groove 68e of the movable pin 68 with a screwdriver or the like while the movable plate 67 and the fixed plate 66 are in contact with the base member 69, and bring the protruding amount to a position corresponding to the specific stroke section W. This is achieved by tightening the nut 70 at that position and fixing the movable pin 68 and the plunger 61.

  The stroke of the plunger 61 needs to be a value (about 1 mm) corresponding to a very thick sewing thread that can be used in the sewing machine, and at least corresponds to the thickness (0.2 to 0.3 mm) of a sewing thread that is normally used. A value is required. Within this range, the thickness may be set to a value obtained by adding a slight compensation value (comma millimeter unit) to the thickness of the sewing thread that is extremely thick or normally used.

The driving means for driving the thread tensioner is not limited to the special solenoid 60 of this embodiment, and various driving means such as a stepping motor and a voice coil motor may be used. Next, the control of this embodiment will be described with reference to the control block diagram of FIG.
CPU (Central Processing Unit) 100, RAM (Random Access Memory) 102, ROM (Read Only Memory) 101, Y feed counter 103 for counting the amount of rotation of each pulse motor, base line counter 104, needle swing counter 105, cloth cutting Cloth cutting knife counter 106 that counts the number of knife movements, Y-feed pulse motor driver 111 that drives each pulse motor, baseline pulse motor driver 112, needle-feed pulse motor driver 113, various sensors and drivers for each drive unit In addition, an I / O interface 109 that connects the operation panel 110 and the CPU 100 to the CPU 100, a sewing machine motor driver 115 that controls the driving of the sewing machine motor 5 that drives the sewing machine, and the rotation amount of the sewing motor 5 are coded as the rotation angle of the upper shaft 6. Sewing machine motor encoder 119 An active tension driver 120 for driving the solenoid 60 of the thread tension device A, a presser raising solenoid drive circuit 121 for driving the presser raising solenoid 122 for raising the cloth presser 15, and a cloth cutting knife lowering cylinder 30 for lowering the cloth cutting knife 16 are driven. An interrupt that outputs an interrupt signal to the CPU 100 according to a cloth cutting knife lowering cylinder drive circuit 123 that performs a predetermined interrupt condition (a counter value indicating the rotation amount of each pulse motor, a cloth feed position, a rotation angle of the upper shaft 6, etc.) It comprises a controller 108 and the like.

  The sewing machine motor driver 115 includes, in addition to the sewing machine motor 5, a needle upper position sensor 116 that detects that the sewing needle 9 is in the upper position, and a feed reference position sensor that detects the reference positions of the cloth presser 15 and the cloth holding plate 14. 117, a TG (Tacho Generator) generator 118 for detecting the rotation angle of the upper shaft 6 is connected.

  The I / O interface 109 includes an operation panel 110 and drivers and drive circuits of each driving unit, a knife lowering detection switch 34 for detecting the lowering of the cloth cutting knife 16, and a presser lowering detecting switch for detecting the lowering of the cloth presser 15. 28, a Y feed origin sensor 26 that detects a state in which the cloth feed (cloth presser 15 and cloth holding plate 14) is at the origin position, a baseline origin sensor 57 that indicates that the baseline position of the needle swing mechanism is at the origin, and a needle swing mechanism A needle feed origin sensor 58 indicating that the swing width of the sewing machine is at the origin, a press switch 124 for instructing lowering of the cloth presser 15, a start switch 125 for instructing start of driving of the sewing machine motor 5, and the like are connected.

  The CPU 100 inputs data from the operation panel 110 and detection signals from various connected sensors according to a control program stored in the ROM 101 using a predetermined area of the RAM 102 as a work area, and various driving units via each driver. Control.

  The ROM 101 has control data such as setting input processing for inputting various setting parameters from the operation panel 110, calculation processing for calculating various sewing patterns, and sewing processing for executing buttonhole sewing based on the sewing patterns. And control programs are stored. The buttonhole sewing machine 1 according to this embodiment is configured to input various setting data from the operation panel 110, calculate each sewing pattern, and drive control of the buttonhole sewing machine 1 to perform buttonhole sewing of various sewing patterns. Sewing is performed.

  First, setting data items input from the operation panel 110 shown in FIG. 8 will be described.

  That is, in relation to the length data of each part of the buttonhole stitching seam shown in FIG. 9, “cloth cutting length data” a, “knife width data” b, “fastening length data” c, “ “Fitting width data” d, “Side stitch pitch data” e, “Fitting pitch data” f, “Gap length data between the cloth cutting knife and the first hook setting” g, and “Cloth cutting knife—Second hook setting” The clearance length data “h” can be set.

  Further, “active tension correction data” indicating the correction value of the solenoid 60 of the thread tension device A, “side sewing tension data”, “tacking tension data”, “sewing start tension data” which are tension data at each sewing timing, “Sewing end tension data” and “thread trimming tension data” can be set.

  Further, in relation to the present invention, “reinforcement sewing selection data”, “reinforcement sewing pitch adjustment data”, “reinforcement sewing width adjustment data”, “decorative sewing selection data”, “decorative sewing pitch adjustment data”, “decorative sewing” "Width adjustment data", "Reinforcement sewing thread tension adjustment data", "Decorative sewing thread tension adjustment data", etc. can be set. It should be noted that the “base line position at the time of reinforcement sewing” can be set for each of the left and right reinforcement stitches. Similarly, the “baseline position at the start of sewing at the time of decorative sewing” can be set for each of the right and left decorative stitches.

  Then, by selecting “1” in the “Reinforcement sewing selection” data item and selecting “0”, the selection of not performing reinforcement sewing is made. Similarly, “decorative sewing selection” is selected. By selecting “0” or “1” for the data item, whether or not to embroidery is selected.

  First, the user performs setting input processing for inputting the setting data from the operation panel 110. In each data item to be input, default setting data and setting data input last time are stored in advance, and the user inputs and changes only data items that need to be changed.

  In each item of setting data, setting range data indicating a range of data values that can be input corresponding to the item is stored in advance, and an error determination is made when data outside the setting range data is input. To be done. In addition, there is a default value set by data.

  A plurality of sets of the above setting data can be registered corresponding to the sewing pattern number. When the user selects and calls an arbitrary sewing pattern number, the set of setting data corresponding to the number is read. Used for actual sewing control.

  Next, the operation of the embodiment of the present invention will be described with reference to the flowcharts shown in FIGS.

  In FIG. 10, the operator sets necessary data from the panel 110 (S-0). When the start key 125 is turned on, sewing data is determined by arithmetic processing based on data (FIG. 8) set in advance from the panel 110 (S-2).

  In this calculation setting, the data in which the reinforcing sewing pitch, the reinforcing sewing width, the reinforcing sewing thread tension, the decorative sewing pitch, the decorative sewing width, and the decorative sewing thread tension are corrected by the panel 110 is taken into consideration. Next, the cloth presser 15 is lowered and clamped on a sewing product (not shown) placed on the cloth holding plate 14 (S-3).

  When the start key 125 is turned on again, the reinforcement sewing subroutine (S-5) is processed. In FIG. 11, when the reinforcement sewing selection data is "0" (S-9), the next decorative sewing subroutine (S-6) is processed.

  In FIG. 12, when the decorative stitch selection data is “0” (S-20), the next overlock subroutine (S-7) is processed. When the overlock subroutine is finished, the cloth cutting knife lowering cylinder 30 is operated so as to move the cloth cutting knife 16 up and down (S-8).

  The case where the reinforcement sewing selection data is “1” in the flowchart of FIG. 11 will be described according to the sewing shape shown in FIG. In FIG. 14, i is the width of the side stitches, and is obtained by i = (db) / 2 from the tacking width d and the knife width b. j is the width of the reinforcing stitches, and is a value obtained by adding the adjustment value set in the panel to the default value. This default value is set as j = i / 3. R1 and R2 are the right end edges of the left and right reinforcing stitches and serve as base line positions. L1 and L2 are the left side edges of the reinforcing stitches, and are the swing width positions from the base line.

  When the reinforcement sewing selection data is “1”, the reinforcement sewing thread tension is set (S-10). The reinforced sewing thread tension is supplied to the solenoid 60 so as to set the tension at which the stitch knot of the upper and lower threads is located in the cloth to be sewed, that is, the reinforced sewing thread tension. Since the solenoid 60 changes the thread clamping force of the tension plates 66 and 67 with almost no change in stroke, it is set almost instantaneously in terms of time.

  Next, the Y feed, the base line, and the swing pulse motors 20, 40, 41 are controlled so as to move to the left sewing start position (P1) (S11).

  Next, the zigzag is started where the reinforcement sewing is started from the sewing start point P1, and the needle drops alternately on the right side edge R1 and the left side edge L1 determined by the set reinforcement sewing width by the set reinforcement sewing pitch. The left side reinforcement stitches are formed from the bottom to the top of FIG. 14 by sewing (S-12). The reinforcing sewing pitch is set to a very fine pitch as compared with the side stitching pitch of the buttonhole stitch by the default value.

  The side sewing length V is determined by V = a + g + h from the cloth cutting length a, the knife-first bar clamp gap length g, and the knife-second bar clamp gap length h set from the panel 110. The reinforcement sewing length is set to the same length as this, and the number of needles (Na) to be sewn in the interval is determined by the reinforcement sewing pitch (FIG. 8, item No. 20) set on the panel and the reinforcement sewing length. It is calculated in the data processing (S-2).

  When the needle value (N) calculated for each stitch by the needle position signal of the sewing machine matches the set value (Na) (S-14), the base line and the swing pulse motor 40 are moved so as to move to the right sewing start position P3. , 41 are controlled (S-15).

  In addition, when moving from the last needle drop position P2 of the left side reinforcement sewing to the right sewing start position P3, by moving the needle after dropping the needle once to the intermediate position P5 of the first tacking (upper) sewing portion, these positions are obtained. As the avoidance position, the crossover thread can be hidden in the first tack stitch.

  After that, the right side reinforcement sewing is started from the sewing start point P3, and in the same manner as described above, the needle drops alternately on the right side edge R2 and the left side edge L2 at the set sewing pitch, and from the top to the bottom of FIG. Reinforcement sewing with a predetermined number of stitches Na is formed (S-16). Thereafter, the needle is stopped at the needle up position.

  Since this reinforcing stitch is formed by zigzag stitching with a fine stitch pitch as described above, the fibers are restrained by the sewing thread, so that the fibers in the vertical and horizontal directions do not come off or unravel. It is optimal to set the sewing pitch to be extremely fine, but some roughness than the fabric has no effect on the effect.

  Further, the reinforcement sewing produces an effect of giving a bulge along the button hole in the vicinity of the center portion when the side sewing of the button hole stitch is formed, and gives the texture to the button hole stitch.

  In addition, by not ending at the final needle drop position P4 of the right side reinforcement sewing, by dropping the needle to the intermediate position P6 of the second tack-fastening portion (lower side) at the time of continuing to the next decorative sewing or hole sewing. The crossover thread can be positioned in the second tack-fastening portion.

  In the flowchart of FIG. 12, the case where the decorative sewing selection data is 1 will be described according to the sewing shape shown in FIG.

  The tension of the decorative sewing thread is set to be substantially the same as that for the reinforcement sewing so as to be whipped (S-21). Then, the Y-feed, base line, and swing width pulse motors 20, 40, 41 are controlled so as to move to the left-side sewing start position P7 following the final position P4 or the intermediate position P6 of the reinforcing sewing (S-22). .

  The default value of the stitching width is set to zero, that is, straight stitching, but the embodiment shown in FIG. 15 shows a state where it is adjusted and set by panel setting so as to be slightly zigzag. The decorative stitching pitch is set to be extremely larger than the side stitching of the buttonhole stitch.

  Based on this setting, the stitches of the decorative stitch are formed on the reinforcement stitch on the left side by the number of stitches Nb calculated and set by the decorative sewing pitch and the side sewing length V (S-25). Although the needle moves from the last needle drop position P8 on the left side to the sewing start position P9 on the right side, the needle drop at the intermediate position P10 may be performed in the barbed stitch portion as in the case of correction sewing. Similarly, a right decorative stitch having a predetermined number of stitches Nb is formed on the right side reinforcement sewing (S29), and the needle stops at the final position P11 (S30). This decorative stitching has the effect of having a bulge along the buttonhole at the center when forming side stitches of the buttonhole stitch together with the reinforcing stitch, and gives an extremely excellent texture to the buttonhole stitch.

The overlocking subroutine will be described with reference to FIG.
From the final position P11 of the decorative sewing or the intermediate position P12 in the center of the second barb fixing portion, the sewing machine moves to the sewing start position P13 of the overlock sewing (S31). As for the thread tension setting of the side sewing, a strong thread tension is set on the panel 110 so that the knot of the upper and lower threads is located at the center of the side sewing on the cloth (S-32). Then, the amount of current to the solenoid 60 increases, and as described above, the clamping force to the condition plates 66 and 67 increases instantaneously.

  When the predetermined number of stitches (Nc) are formed on the left side (S-35), the tacking thread tension is set (S-36). Since the bartack thread tension is set to be weak so that it becomes whipped, if the amount of current to the solenoid 60 decreases, the tension plates 66 and 67 instantly hold the clamping force as described above. Decrease.

  Then, when the first stitching with the predetermined number of stitches (Nd) is completed (S-39), the side sewing thread tension is set in the same manner as described above (S-40), and the current to the solenoid 60 is increased and the tension plate is adjusted. After that, the right side sewing with a predetermined number of stitches (Ne) is formed (S-43).

  When the right stitching of the predetermined number of stitches (Ne) is completed, the bar-tacking thread tension is set again (S-44), the current to the solenoid 60 is reduced to reduce the clamping force to the tension plate, and then A second tack stitch with the number of stitches (Nf) is formed (S-47).

  Thereafter, the current amount to the solenoid 60 is adjusted by the thread tension setting at the end of sewing (S-48), and then the needle is stopped at the needle up position (S-49).

  Thereafter, according to the thread trimming subroutine (S-50), the Y feed pulse motor 20 is controlled so as to perform thread trimming, and thread trimming is performed by mechanical operation with a thread trimming mechanism (not shown) accompanying the movement of the presser 15. The thread trimming is performed by a conventionally known structure that opens and closes. At this time, the current amount to the solenoid 60 is adjusted by the tension setting at the time of thread trimming. In the present embodiment, the order in which the reinforcing stitches corresponding to the both-side stitches are formed first and then the buttonhole sewing is started is shown, but after the buttonhole sewing is started, immediately before each side sewing is formed. Reinforcement stitches may be formed. In other words, it is only necessary that the reinforcing stitches are formed under the side stitches where the outer seams come out.

  In the present embodiment, the description has been given of the sewing machine that forms the buttonhole stitching by the main sewing, but the sewing machine may form the buttonhole sewing by the ring stitch. Further, the buttonhole can be either a sleep hole or a eyelet hole.

  Further, in this embodiment, the operator inputs and sets the pitch and width of the reinforcing stitches. However, depending on the setting of the pitch and width of the overlock stitch, the pitch and width become smaller than those. As described above, the calculation (calculation) may be performed automatically, or a default value may be set. Similarly, default values may be set for the pitch and width of decorative sewing.

  Further, the thread tension setting of the reinforcement sewing and the decorative sewing is shown as the default setting for inputting the adjustment value from the panel 110. However, the operator newly sets the thread tension setting from the panel 110 so as to perform the whip sewing. It may be.

  Further, in the present embodiment, the reinforcement stitches and the decorative stitches are formed before the over stitching, but the reinforcement stitches and the decorative stitches are formed immediately before each side stitch formation of the over stitches. It may be.

  Further, in the present embodiment, the reinforcing stitch is formed by a high-density zigzag stitch which is narrower than the side stitch. However, when the width of the reinforcing stitch is set, “0” is input, In addition, by forming reinforcement stitches with straight stitches set at a high density (small) pitch, needles are dropped between each fiber or a small number of fibers, so fabric fibers can be sewn with sewing threads in the same way as zigzag stitching. The same effect can be obtained.

  The pitch at the time of zigzag stitching or straight stitching needs to be selected depending on the thickness and roughness of the fabric fibers, but the finer (smaller) pitch, the greater the reinforcing effect.

  Next, a second embodiment of the present invention will be described with reference to FIGS. The sewing machine to which this embodiment is applied is the same as that shown in FIGS. 1 to 6, and the control block diagram shown in FIG. 7 is also the same. In this embodiment, before the buttonhole stitch is formed, the overlap stitch that repeats the reinforcing stitch formed by zigzag stitching or linear stitching, which is narrower than the side stitching portion, a plurality of times is formed at the side stitching and tacking formation position. And at this time, the needle is prevented from falling to the same point.

  FIG. 16 is a chart showing items of setting data input and set from the operation panel 110, FIG. 17 shows an example in the case where the reinforcing stitch is a straight stitch, and (A) shows each part of the buttonhole stitch and the reinforcing stitch. Explanatory drawing which shows the length of this, (B) shows the example which shifts a reinforcement sewing to a vertical direction, (C) shows the example which shifts a reinforcement sewing to a horizontal direction. From the operation panel 110, in addition to the same data (FIG. 8) as in the first embodiment, “reinforcing sewing pitch” s shown in FIG. 17A and “longitudinal deviation” shown in FIG. The amount “t” and the “lateral displacement amount” u shown in FIG. 17C can be set. Here, the amount of deviation in the vertical direction is the amount of deviation when the start point of the reinforcement stitching of each of the repeated stitches that are repeated a plurality of times is shifted in the direction along the button hole with respect to the start point of the reinforcement stitch of the previous round, The amount of lateral displacement is the amount of displacement when the start point of each of the reinforced stitches that are repeated multiple times is shifted in the direction perpendicular to the button hole with respect to the start point needle drop position of the previous reinforced stitch. is there. FIGS. 17B and 17C show an example in which the reinforcement sewing is performed twice. In (B), for the sake of illustration, the width of the second reinforcing stitch is drawn wider than that of the first reinforcing stitch, but in fact it is the same width, and most of the parallel portions of the respective reinforcing stitches. Are overlapping. P1 to P14 are needle drop positions for the first reinforcement sewing, and P15 to P28 are needle drop positions for the second reinforcement sewing. Therefore, the vertical direction deviation t and the horizontal direction deviation u in this case are the vertical and horizontal deviations of the second reinforcing sewing start point P15 with respect to the first reinforcing sewing start point P1. Further, in (A), L ′ and R ′ indicate the lateral positions of the reinforcing stitches formed at the left and right side stitch forming positions, respectively.

  Next, the second embodiment will be described with reference to the flowcharts shown in FIGS. In FIG. 18, the operator sets necessary data from the operation panel 110 (S-51). When the start key 125 or the preparation key provided on the operation panel 110 is turned on, sewing data is determined by calculation processing based on data (FIGS. 8 and 16) set in advance from the operation panel 110 ( S-53). Note that the flowchart shows an example in which a preparation key is used instead of a start key.

  In this calculation setting, as in the first embodiment, the data obtained by correcting the reinforcing sewing pitch, the reinforcing sewing width, the reinforcing sewing thread tension, etc. by the panel 110 are taken into consideration, and the calculation setting is unique to the present embodiment as shown in FIG. Is calculated (described later). By turning on the preparation key again, the data can be set again (S-54). Thereafter, when the workpiece is set (S-55) and the start key 125 is pressed (S-56), reinforcement sewing is performed (S-57). After the reinforcement sewing is over, overlock sewing is performed (S-58). When overlock sewing is completed, the cloth cutting knife lowering cylinder 30 is operated so as to move the cloth cutting knife 16 up and down (S-59). The overlock subroutine is the same as that shown in FIG. 13 described in relation to the first embodiment.

  The calculation shown in the flowchart of FIG. 19 will be described according to the sewing shape shown in FIG. As in the first embodiment, the side sewing length V is determined by the cloth cutting length a, the knife-first bar clamp gap length g, and the knife-second bar clamp gap length h set from the panel 110. V = a + g + h, and the reinforcing stitch length is set to the same length as this, and the first stitch is determined by the reinforcing stitch pitch (No. 10 in FIG. 16) set on the panel and the reinforcing stitch length. Reinforcement sewing needle entry calculation is performed (S-60). Next, 1 is set to the variable n (S-61), and the needle drop calculation of each reinforcing sewing is performed until n reaches the number of times of reinforcing sewing (S-62 to S-64). That is, in the case of FIG. 17B, the position moved in the vertical direction (t × n) is set as the needle drop position, and in the case of FIG. 17C, the position moved in the horizontal direction (u × n) is set as the needle drop position. Let it be the falling position. When n reaches the number of times of reinforcement sewing, the needle drop calculation for the overlock stitching is performed (S-65). In the case of FIG. 17 (B), the needle drop positions at the upper and lower ends of each reinforcement sewing (P7 and P14 for the first reinforcement sewing, P21 and P28 for the second reinforcement sewing) are all. It is desirable to provide a means for entering the position where the tacking is formed. For example, an error message is displayed on the operation panel 110 or a display panel (not shown) when the needle drop position at the upper end or the lower end of the n-th reinforcement sewing is deviated from the position where the tack is formed during the calculation of S-63. Can be. Similarly, in the case of FIG. 17C, it is desirable to provide means for causing all the needle drop positions on the right edge and the left edge of each reinforcing stitch to enter the position where over stitching (side stitching) is formed. . For example, in the case of the first reinforcement sewing, for example, P1 and P13, and in the case of the second reinforcement sewing, if any one of P15 and P27 is out of the formation position of the overlock stitching, an error message is similarly displayed. Can be displayed.

  In addition, although the example which shifted to the direction along a button hole and the orthogonal direction was shown in the above, it is not restricted to this, The pitch s of each reinforcement sewing of a lap stitch can also be made different. For example, the item No. of the setting data in FIG. 15 “Change amount of reinforcing sewing pitch” s ′ is set. The flowchart of FIG. 18 is similarly applied to this case, and the needle drop calculation of FIG. 19 is performed only by setting the processing of S-63 to “reinforcement sewing pitch s + n × s ′ for the first needle drop”. The other is the same.

  Moreover, although the example which used the straight stitch as the reinforcement sewing was demonstrated about the above 2nd Embodiment, you may make a zigzag stitch narrower than a side stitch part as a reinforcement stitch. In this way, when the zigzag stitch is used as the reinforcing stitch, the width of the reinforcing stitch can be further varied. For example, the item No. of the setting data in FIG. 16 “Reinforcement Width” D and No. 17, “amount of change in the width of the reinforcement stitching” D ′ is set. The flowchart of FIG. 18 is similarly applied to this case. In the needle drop calculation, the processing of S-63 in FIG. 19 is set to “D + n × D ′ as the width of the reinforcing stitch for the first needle drop”. Only the difference is the same as in FIG.

  When forming the overlap stitch that repeats the reinforcement stitching multiple times at the side stitching and tacking formation position, if the needle is dropped to the same position in each reinforcement stitching, the ground yarn breakage that cuts the fibers of the sewing product with the needle, A situation such as cutting the stitched thread with a needle occurs, resulting in poor strength. Further, since the sewing at the same place is repeated many times, the needle thread loop becomes unstable, and stitching defects such as stitch skipping and thread breakage occur. However, in the present embodiment, since the needle does not fall at the same point, it is possible to eliminate ground thread breakage, poor sewing, and the like, and the quality of the sewing product can be greatly improved.

  Next, a third embodiment of the present invention will be described with reference to FIG. The sewing machine to which this embodiment is applied is the same as that shown in FIGS. 1 to 6, and the control block diagram shown in FIG. 7 is also the same. In this embodiment, before the buttonhole stitches are formed, reinforcing stitches formed by zigzag stitching or linear stitching which are narrower than the side stitching portions are formed at the left and right side stitch forming positions, and these left and right reinforcing stitches are formed. The sewing start positions P1 and P8 can be changed in a direction perpendicular to the button holes. That is, the item number of the setting data in FIG. No. 18, “X-direction start position of left reinforcement sewing” L ′, No. 18 19, “X-direction start position of right reinforcement sewing” R ′ can be set. However, the xy direction is the direction shown in FIG.

  When performing reinforcement sewing and side sewing on the workpiece, the left and right reinforcing stitches 129L and 129R are positioned in the x-direction positions L ′ and R ′ (the center in the x direction in the case of zigzag stitching) and the left and right side stitches due to the expansion and contraction of the cloth. The centers 130Lc and 130Rc in the x direction of 130L and 130R may shift and adversely affect the quality of the sewing product. In such a case, if the amount of deviation can be predicted in advance from the nature of the sewing product, according to the present embodiment, by adjusting the x-direction start position of the left and right reinforcing stitches, It is possible to match the centers in the x direction. In FIG. 16, “the left reinforcing stitch in the x-direction starting position” L ′ and “right reinforcing stitch in the x-direction starting position” R ′ are shown as items that can be set independently of each other. It is also possible to handle the starting position in the x direction integrally and change L ′ and R ′ by the same amount. Further, the present embodiment can be applied to the reinforcement sewing and the decorative sewing of the first embodiment. That is, R1, R2 or L1, L2 in FIGS. 14 and 15 can be changed. Furthermore, the present embodiment can be applied to the case where overlap stitching is repeated a plurality of times as in the second embodiment. That is, R ′ and L ′ in FIG. 17 can be changed.

It is a perspective view of an internal mechanism of a buttonhole sewing machine according to the present invention. It is a perspective view of the internal mechanism in the state seen from the opposite side of FIG. It is the front view which looked at the needle swing mechanism of FIG. 2 from the needle side. It is a side view which shows the thread tension device of FIG. It is a disassembled perspective view of the thread tension device of a sewing machine. It is sectional drawing which shows the solenoid of a thread tension device. It is a control block diagram of a buttonhole sewing machine. It is a chart figure of a parameter table which shows a parameter inputted and set from an operation panel. It is explanatory drawing which shows the length of each part of a buttonhole stitching. It is an operation | movement flowchart of buttonhole sewing. It is a flowchart of a reinforcement sewing subroutine. It is a flowchart of a decorative sewing subroutine. 10 is a flowchart of an overlock subroutine. It is explanatory drawing which shows the order of reinforcement sewing. It is explanatory drawing which shows the order of decoration sewing. It is a chart figure which shows the item of the setting data input and set from the operation panel in other embodiment of this invention. It is explanatory drawing of the reinforcement seam in the 2nd Embodiment of this invention, (A) shows the length of each part of a buttonhole stitch, and a reinforcement seam, (B) shows the example which shifts a reinforcement seam to a vertical direction. , (C) shows an example of shifting the reinforcement sewing in the horizontal direction. It is an operation | movement flowchart of the buttonhole over stitching of 2nd Embodiment. It is a flowchart of the needle drop calculation of the buttonhole over stitching of the second embodiment. It is explanatory drawing of the reinforcement sewing in the 3rd Embodiment of this invention.

Explanation of symbols

A Thread tension device 1 Sewing machine 2 Bed 3 Vertical trunk 4 Arm 5 Main motor 6 Upper shaft 8 Needle bar 16 Cloth cutting knife 30 Cloth cutting knife lowering cylinder 40 Base line motor 41 Needle swing motor 42 Needle swing mechanism 54 Needle swing cam 60 Solenoid (Driving means)
61 Plunger 64 Coil 65 Magnetic member 66, 67 Thread tension plate 68 Movable pin 70 Nut 110 Operation panel 120 Active tension driver

Claims (3)

Stitch formation to form a pair of side stitching along the sides of the buttonhole to be incised formed on the workpiece, and Me bar tacking continuous on both sides stitching located at at least one end side of the buttonhole, the buttonhole darning stitches by In a buttonhole sewing machine with means,
Before forming the buttonhole stitch, when forming a lap stitch that repeats a plurality of reinforced stitches formed by zigzag stitching or linear stitching, which is narrower than the side stitching portion, a plurality of times of reinforced stitching is reinforced. An operation panel for setting a lateral shift amount when the sewing start point needle drop position is moved in a direction perpendicular to the button hole with respect to the start stitch needle drop position of the previous reinforcing stitch;
Control means for forming the overlapped stitches at the position where the side stitches and the both-side stitches are formed so as to prevent the needle from falling at the same point based on the amount of lateral deviation set by the operation panel. A buttonhole sewing machine characterized by comprising The control means includes
Before forming the buttonhole stitch, the pitch of the reinforcement stitches of each of the overlap stitches that repeats the reinforcement stitches formed by zigzag stitching or linear stitching that is narrower than the side stitches a plurality of times is different. The buttonhole sewing machine according to claim 1. The control means includes
The width of each of the reinforced stitches of the overlap stitch that repeats the reinforced stitch formed by zigzag stitching, which is narrower than the side stitched portion, a plurality of times before forming the buttonhole stitches is different. Buttonhole sewing machine as described in

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