JP4750954B2 - Cycle sewing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cycle sewing machine that forms a seam while feeding a cloth and cuts the cloth.
[0002]
[Prior art]
Conventionally, in sewing clothes, when sewing a plurality of fabrics and cutting off excess portions, the fabrics are first sewn with a sewing machine and then cut with a cutter.
For example, when the shoulder portion (the portion surrounded by the dotted line) of the running wear shown in FIG. 24A is stitched, the shoulder portion of the running wear is stitched with the front body and the back body overlapped with each other as shown in FIG. ), The seam 300 is formed and stitched, and then the excess portion 301 is cut.
[0003]
[Problems to be solved by the invention]
However, the operation of repeating the process of sewing a relatively short distance and then cutting it as described above is inefficient from an industrial point of view.
On the other hand, in the case of the stitching of the hook portion of the brassiere shown in FIG. 25, first, a number of hook components 306 shown in FIG. As shown in FIG. 25 (b), the hook cloth 302 is cut by ultrasonic waves at portions indicated by dashed lines x1, x2, x3, and x4 along the longitudinal direction. The best time 304 is inserted. Finally, as shown in FIG. 25 (c), the seam 305 was formed by two-point zigzag stitching with a sewing machine and stitched together.
When cut by this ultrasonic wave, heat is generated in the fabric at the time of cutting, so that the fibers of the cut portions 303a and 303b are shrunk by heat to form a small lump, so that the touch becomes worse and the commercial value is lowered. In addition, handling the small hook portion 303 and stitching together one by one is troublesome, and the work efficiency is lowered.
[0004]
The object of the present invention is to improve the workability and improve the comfort of the sewing work that requires the formation of seams and the cutting of the cloth, particularly in the sewing of relatively fine parts as described above. It is to obtain a sewn product.
[0005]
[Means for Solving the Problems]
  In order to solve the above problems, the invention according to claim 1 is, for example, as shown in FIGS.
  A cloth holding member (cloth holding plate 14 and cloth presser 15) that holds the cloth and is movable along at least one direction;
  A sewing needle (9) capable of a needle swinging motion in a direction intersecting the one direction;
  In a cycle sewing machine (button hole sewing machine 1) provided with a cloth cutting knife (16) provided in the vicinity of the needle and capable of moving up and down,
  Forming a first row of stitches and cutting the fabric with the cloth cutting knife along the stitches; forming two rows of stitches; and cutting the cloth between the two rows of stitches. An operation panel (110) capable of selecting one of the second sewing patterns for cutting the cloth with a knife and setting a cutting length exceeding the stitch length of the seam;
  By forming the stitches of the first sewing pattern or the second sewing pattern by the needle swinging movement of the sewing needle and the movement of the cloth holding member, and with the cutting length set along the stitches, Control means (CPU 100) for controlling the cloth cutting knife to cut the cloth is provided.,
The operation panel can select a third sewing pattern ("0" in FIG. 13) that forms a buttonhole while performing over stitching, and the cutting length and the stitch length of the seam can be set individually. NaIt is characterized by that.
[0006]
According to the first aspect of the present invention, the cloth is cut along the seam while forming the seam under the control of the control means, and therefore, the seam is formed and the cloth is cut by the sewing machine. Since it is performed once or continuously, the work efficiency of the sewing work that requires the formation of stitches and the cutting of the cloth is improved.
[0015]
  Claim1In the cycle sewing machine described in claim2As described in the invention, it is preferable that the movement amount of the cloth when the cloth is moved along the one direction can be set by the cloth holding member without forming a seam.
  In this case, the movement amount of the cloth may be directly input by the operator through the operation panel or the like, or other parameters related to the movement amount are input instead of the movement amount of the cloth itself. The movement amount may be obtained and set by calculation from these parameters.
[0016]
  Claim 1Or 2In the cycle sewing machine according to claim 1, the specific shape of the seam is not particularly limited.3As described in the invention described above, the seam may have a zigzag shape in which tacking stitches are formed at both ends.
[0017]
  Claims 1 to3In the cycle sewing machine according to claim 1,4As described in the invention, the cloth cutting knife may have a knife length shorter than a set cutting length, and may be configured to cut the cutting length by moving up and down a plurality of times.
[0018]
  Claims 1 to4In the cycle sewing machine according to claim 1,5As described in the invention, the cloth cutting knife may be provided at a position separated from the sewing needle by a predetermined distance in the one direction.
[0019]
  Claim6The invention described in claim 15In the cycle sewing machine described in any one of the above, when the upper thread is slackened between the needle and the cloth, a pulling means (rotary solenoid 64) for pulling up the upper thread is provided.
  Claim6According to the invention described in (3), when the upper thread is slack, it can be appropriately pulled up.
[0020]
  Claim7The invention described in claim 16In the cycle sewing machine according to any one of the above, for example, as shown in FIG. 11, the distance between the stitches and the cutting position by the cloth cutting knife (female groove left width, female groove right width) can be set. To do.
[0021]
  Claim8The invention described in claim 17In the cycle sewing machine according to any one of the above, the cloth is long and the one direction is a width direction of the cloth.
  As described above, the cycle sewing machine of the present invention can be suitably used for the work of forming seams and cutting the cloth along the short side direction of the long cloth.
[0022]
  Claims 1 to8The cycle sewing machine according to any one of claims 1 to 4,9As in the invention described in (1), a buttonhole sewing machine may be used.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.
1 to 3 show a buttonhole sewing machine 1 as an example of a cycle sewing machine according to the present invention. 1-3, 2 is a bed, 3 is a vertical trunk | drum, and 4 is an arm.
The buttonhole sewing machine 1 has a sewing needle 9 that performs a lifting operation and a needle swinging operation in the front-rear direction (X direction) in FIG. 1, a cloth holding that holds the cloth on the lower side and reciprocates in the cloth feeding direction (Y direction). A cloth presser 15 that holds the sewing product between the plate 14 and the cloth holding plate 14, an upper thread trimmer scissor (hereinafter referred to as scissors) 70 that cuts the upper thread above the cloth presser 15, and moves up and down to cut the cloth. A cloth cutting knife 16, an operation panel 110 (FIG. 9) for inputting various setting data, a control circuit 200 (FIG. 19) for controlling the buttonhole overlock sewing machine 1, and the like are provided. The details of the mechanical configuration of this embodiment are described in Japanese Patent Application Laid-Open No. 11-9862, and will be briefly described here.
[0030]
First, the cloth feed mechanism will be described. As shown in FIG. 2, the cloth presser 15 is connected to the cloth feeding member 23 via the connecting arm 24, and the cloth holding plate 14 is directly fixed to the cloth feeding member 23. A rack 22a is formed on the side surface of the feed shaft 22, and is supported by the sewing machine frame so as to be movable along the cloth feed direction. On the other hand, a pinion 20a is attached to the motor shaft of the Y feed pulse motor 20, and the pinion 20a and the rack 22a are engaged with each other. The cloth feed member 23 is fixed to the feed shaft 22, and when the feed shaft 22 is driven in the left-right direction by the operation of the Y feed pulse motor 20, the cloth holding plate 14 and the cloth presser 15 are both Y through the cloth feed member 23. It is designed to reciprocate in the direction. The cloth holding plate 14 and the cloth presser 15 constitute the cloth holding member of the present invention.
[0031]
The cloth presser 15 is driven by the presser lifting solenoid 122 to move up and down, clamps the cloth with the cloth holding plate 14 when lowered, and releases the cloth when lifted.
The cloth presser 15 is automatically driven in a series of sewing operations. However, the operator can instruct to raise and lower via the presser switch 124 (FIG. 19).
[0032]
Next, the drive mechanism of the sewing needle 9 will be described.
As shown in FIGS. 2 and 3, the vertical drive mechanism of the sewing needle 9 includes an upper shaft 6 that is rotationally driven by a sewing machine motor 5, a crank cam 7 provided on the upper shaft 6, and the like. The rotation is converted into a lifting motion by the crank cam 7 and transmitted to the needle bar 8. The rotation of the upper shaft 6 is transmitted to the lower shaft 11 via the connecting shaft 10, and the shuttle 12 connected to the lower shaft 11 is rotated in synchronization with the vertical movement of the needle 9.
[0033]
The needle swing mechanism of the sewing needle 9 is a base line changing mechanism that changes the base line used as a reference for the needle swing in the front-rear direction (X direction) in FIG. 3. The main needle swinging mechanism swings in the X direction orthogonal to the needle swinging width changing mechanism for changing the needle swinging width.
As shown in FIGS. 3 and 4, the main needle swinging mechanism supports the needle bar 8 so that the needle bar 8 can move up and down and can rotate about the shaft 18a, and is fixed to the sewing machine frame. 18, a connecting shaft 48 rotatably supported on the machine frame parallel to the upper shaft 6, a connecting lever 47 fixed to one end of the connecting shaft 48, and a needle bar swinging base fixed to the other end of the connecting shaft 48 18 is connected to the tip of the connecting lever 47, a needle swinging arm 49 connected to the shaft 18, a support shaft 53 that rotates in conjunction with the upper shaft 6 via gears 51 and 52, a triangular cam 54 attached to the support shaft 53 In addition, the bifurcated portion at the other end includes a cam lever 46 and the like that engages with the triangular cam 54.
[0034]
When the rotation of the upper shaft 6 is transmitted to the triangular cam 54, the cam lever 46 is swung with a predetermined swing width. When this swing is transmitted to the connecting shaft 48, the needle bar rocking base 18 is moved to the fulcrum 18a. And the sewing needle 9 is swung in the X direction.
Therefore, the needle swinging operation of the main needle swinging mechanism is linked to the lifting and lowering movement of the sewing needle 9 via the upper shaft 6, and the needle bar 8 is brought to the base line at the timing when the sewing needle 9 descends for the first time. The needle bar 8 is brought from the base line to a position with a predetermined swing width at the timing of the second descend.
[0035]
As shown in FIG. 4, the baseline changing mechanism determines the origin of the swinging motion of the cam lever 46 when the baseline changing lever 43 rotates around the fulcrum 43a by the rotation of the baseline feed pulse motor 40. The position of the fulcrum 44a of the lever 44 changes as indicated by an arrow A, and thereby the base line position of the needle swing of the sewing needle 9 is changed.
With the rotation of the needle feed pulse motor 41, the swing width changing mechanism changes the position of the connecting shaft 44b between the base lever 44 and the connecting link 45 as shown by the arrow B through the links 55 and 56, and thereby the triangular cam. The amount of rocking of the cam lever 46, that is, the needle bar rocking base 18 accompanying the rotation of 54 changes, and the amount of swing of the sewing needle 9 changes.
In the sewing machine 1, the needle bar 8 is swung back with a predetermined swing width amount with respect to the set base line (front side in FIG. 3).
[0036]
Next, the cloth cutting knife 16 of the buttonhole overlock sewing machine 1 will be described with reference to FIG. On the tip of the arm 4, a cloth cutting knife air cylinder unit 30 is installed as a driving means for knife movement. In the arm 4, a knife mounting plate 31 that moves up and down by driving a cloth cutting knife air cylinder 30 is vertically arranged. A cloth cutting knife 16 is attached to the lower end of the knife mounting plate 31 by a set screw 32, and the cloth cutting knife 16 is driven by an air cylinder 30 to move up and down. The air cylinder 30 is controlled by the CPU 100 via the cloth cutting knife lowering cylinder drive circuit 123. Therefore, under the control of the CPU 100, the cloth cutting knife 16 cuts the cloth to form a buttonhole, or separates the cloth.
As shown in FIG. 5, a return spring 33 for returning to ascending is connected to the female attachment plate 31.
[0037]
The buttonhole sewing machine 1 is provided with a thread trimming mechanism (thread trimming means) that cuts the upper thread after sewing. This thread trimming mechanism will be described with reference to FIG. The thread trimming mechanism includes scissors 70, a stopper 72, an operating lever 73, a thread trimming link 74, a coil spring 75, and the like.
The scissors 70 are composed of a fixed blade 70a and a movable blade 70b. The fixed blade 70a and the movable blade 70b are attached to the tip end portion 74a of the thread trimming link 74 by a step screw (not shown) so as to be freely opened and closed.
[0038]
The thread trimming link 74 is pivotally supported by the operating lever 73, and is driven to rotate in the horizontal direction (surface parallel to the paper surface) and the vertical direction via the operating lever 73. Further, the thread trimming link 74 is urged in the horizontal direction by the coil spring 75 in the direction in which the scissors 70 move forward (upward in FIG. 6). On the other hand, the base end portion of the thread trimming link 74 normally abuts against the stopper 72 so that it does not rotate against the urging force of the coil spring 75. The lift lever 71 is operated by a presser lifting solenoid 122 (FIG. 19) that is urged by a presser lifting solenoid drive circuit 121 (FIG. 19).
A cam member 76 for closing the scissors 70 is provided on the rear side of the cloth presser 15.
[0039]
In the thread trimming mechanism, when the stopper 72 is released, the thread trimming link 74 moves forward by the biasing force of the coil spring 75 and enters between the cloth presser 15 and the presser support member 17 (see FIG. 1). To go. At that time, when the movable blade 70b of the scissors 70 contacts the cam member 76 and the movable blade 70b rotates thereby, the scissors 70 are closed and the upper thread is cut.
In the sewing machine 1, after the upper thread is cut, the Y feed pulse motor 20 is actuated to move the connecting arm 24 to the right, and the leading end of the thread trimming link 74 is attached to the plate member 24 a fixed to the connecting arm 24. The scissors 70 are opened by the scissor opening cam member 76a while 74a abuts, and the thread is released.
[0040]
A thread tension 19 is provided at the front lower portion of the arm 4 of the buttonhole sewing machine 1. The thread tension 19 applies resistance to the upper thread by sandwiching the upper thread between a pair of tension plates, and changes the resistance by the thrust of the thread tension solenoid 60.
FIG. 7 shows the structure of the thread tension 19. The thread tension 19 includes a base member 69, a thread tension solenoid 60, a movable pin 68, a fixed tray 66 and a movable tray 67 that constitute a tension tray.
In the thread tension 19, the screws 63, 63 are engaged with the thread tension solenoid 60 in a state of passing through the base member 69 and the frame 4a of the arm portion 4, whereby the base member 69 is outside the frame 4a. In addition, the thread tension solenoid 60 is integrally fixed to the inside of the frame 4b.
[0041]
The movable pin 68 is screwed into the plunger 61 of the thread tension solenoid 60 while passing through a base plate 69 and a hole (not shown) in the center of the fixed plate 66 and the movable plate 67 formed in a disc shape. ing. The fixed position of the movable pin 68 and the plunger 61 can be adjusted as appropriate by tightening the nut 70. The frame 4a is provided with an insertion hole 4b through which the movable pin 68 and the plunger 61 are inserted. Further, a slit (not shown) and a threading hole 68d continuous with the slit are provided in the shaft portion of the movable pin 68. The upper thread is set so as to be sandwiched between the fixed plate 66 and the movable plate 67 while being passed through the threading hole 68d through the slit.
On the other hand, the thread tension solenoid 60 is controlled by the CPU 100 via the thread tension solenoid drive circuit 120 and applies thrust to the plunger 61 in the direction of arrow C in FIG. When the plunger 61 moves in the C direction, the movable pin 68 also moves in the same direction, the space between the fixed plate 66 and the movable plate 67 is further closed, and the tension applied to the upper thread is increased. Conversely, if the plunger 60 returns to the direction opposite to the C direction, the tension applied to the yarn becomes weak.
[0042]
Although not shown in FIG. 1, as shown in FIG. 8, a rotary solenoid 64 that rotates in a state where the upper thread T is hung is provided at the upper end portion of the arm 4.
The rotary solenoid 64 is provided with a thread insertion part 64a that has a hole through which a thread is inserted and is rotatable. The operator passes the upper thread through the thread insertion part 64a and then passes the upper thread T to the thread tension 19. Induce.
The rotary solenoid 64 is controlled by the CPU 100 via the rotary solenoid drive circuit 114, and is normally in the state shown in FIG. 8A. After the idle feed of the cloth, which will be described later, as shown in FIG. 64a is driven to rotate and the upper thread is handled.
[0043]
FIG. 9 shows the operation panel 110 of the buttonhole sewing machine 1. The operation panel 110 is used to set and input various sewing patterns and sewing parameters, and to output a set value display and a display error of sewing control. For example, a buttonhole sewing machine 1 is placed thereon. Provided on the sewing machine table.
The operation panel 110 includes various keys and a display unit as shown in FIG. That is, the sewing key 131, the LED display unit 132 for displaying that the sewing mode 131 is pressed and the sewing mode is turned on, the selection key 133, and the selection key 133 are lighted sequentially each time the selection key 133 is pressed. No. , Parameter no. LED display sections 134 and 135 for displaying each setting mode are provided.
[0044]
Furthermore, a numerical value display unit 140 including a pattern / parameter number display unit 141 using a 2-digit LED 7 segment and a parameter value display unit 142 using a 4-digit LED 7 segment, and a numerical value of the numerical display unit 140 are increased or decreased by one. A minus key 143 and a plus key 144, and a down key 145 and an up key 146 for increasing / decreasing a numerical value of the numerical value display unit 140 for each predetermined unit are provided.
When the operator selects one pattern via the operation panel 110, various parameter values in the pattern are set.
[0045]
Based on FIGS. 10 and 11, patterns and parameter values set via the operation panel 110 will be described.
The buttonhole overlock sewing machine 1 can be sewn in two modes. The first mode is a buttonhole mode in which a buttonhole is formed while overlocking, and the second mode is a buttonhole for clothing. This is a special mode in which the fabric is cut while overlocking other parts.
The selection of these two modes is performed by, for example, inserting a floppy disk storing a control program or control data of one of the two modes into the floppy disk drive 105 described later and automatically turning on the floppy disk when the power is turned on. May be configured to be set to one of the modes, or the mode may be selected on the operation panel 110.
[0046]
FIG. 10 shows setting items in the buttonhole mode. The table shown in FIG. 10 is a well-known one that a conventional buttonhole sewing machine has.
As shown in FIG. 10, for example, there are 28 types of data items, the range that can be set for each is determined as in the “setting range” field, and the change unit when changing the setting is as in the “unit” field. It has been decided.
“Pattern No.” is a typical variation of buttonhole sewing in which predetermined data is preset for all data items, and 10 patterns can be set in this table.
Among the data items, data No. 10 “shape” is an item for selecting the shape of both ends of the overlock stitching. For example, a radial sewing type or a zigzag sewing type can be selected. In addition, data No. The “cloth cutting length” of 1 is the length of the buttonhole formed in the overlock stitching. As a matter of course, as shown in FIG. 12A, the length of the buttonhole H is set to a length that fits inside the overlock stitching J1.
[0047]
FIG. 11 shows setting items in the special mode. The special mode is a mode in which the cloth is cut while applying the buttonhole over stitching technique and performing the overlock stitching at portions other than the buttonhole portion. For example, it can be used at the time of sewing such that fabrics are sewed together and excess portions are cut off. Therefore, as shown in FIG. 12B, unlike the buttonhole mode, the cut length C of the cloth can be set to a length exceeding the range of the overlock stitching J2.
[0048]
Among the data items in FIG. 10 “shape” is an item for setting the cloth cutting length and the outer shape of the over stitching. For example, one of four types shown in 0, 1, 2, and 3 in FIG. 13 can be set. In FIG. 13, the shape “0” is the same shape as that of the conventional buttonhole overlock stitching, in which the periphery of the cloth cutting portion at the center is stitched over. Shapes “1”, “2”, and “3” are types that cut the cloth over a range that exceeds the length of over stitching. The shape “1” is the one that is stitched on the left side of the cut portion, the shape “2” is the one that is stitched on the right side of the cut portion, and the shape “3” is the one that is stitched on both sides of the cut portion.
[0049]
The other data items indicate the length of each part of the over stitching. 14A, 14B, and 14C show the correspondence between each data item and the stitch portion in the order of sewing, taking the case where the shape “1” is sewn as an example. From the first sewing point (needle drop point) m1 in FIG. 14A, the sewing point m2 is reached in a zigzag manner. Next, the needle moves to the sewing point m3 in FIG. 14 (b) and is zigzag stitched in the direction returning from the sewing point m3, and the process ends at the sewing point m4. The line L1 is cut by the cloth cutting knife 16 while sewing shown in FIG. 14B, and finally the state shown in FIG. 14C and the point n1-n2 on the right side is cut. Become. The timing of cutting and sewing will be described later.
[0050]
Among the data items in FIG. 1 “sewing length” is a length indicating the total length of over stitching. No. 6 “First Clearance”, No. 6 7 "second clearance" indicates a length that is excessively cut beyond the sewing length. In the sewing machine 1, the total length of the cutting length by the cloth cutting knife 16 is “first gap + sewing length + second gap”. 1, no. 6, no. When a value of 7 is input, it is automatically calculated and set.
[0051]
Data No. 2 “Right width of the female groove” is the distance between the line L1 and the left end of the overlock stitch when the overlock stitch is sewn to the right side of the line L1. Data No. 9 “Pinching pitch” is a pitch (feed length between needle drop points) in “first hooking length” (No. 25) and “second hooking length” (No. 5), Normally, as shown in FIG. 14B, the pitch of the tacking portion is set narrower than the pitch of the other portions. Data No. 17-No. Reference numeral 20 denotes data relating to the setting of the tension of the upper thread by the thread tension 19. 23, 24, 26, and 27 are data relating to the needle drop positions at the start and end of sewing. Data No. 35 “Tension during idle feeding” is an upper thread tension when the cloth is fed (idle feed) without sewing immediately after sewing, and will be described later.
In the special mode, a pattern number as a typical sewing pattern may be set as in FIG.
[0052]
The timing of cutting and sewing in the special mode sewing will be described below.
The buttonhole overlock sewing machine 1 according to the present embodiment cuts the cloth by a so-called “medium knife” method in which the cloth is cut by the cloth cutting knife 16 while sewing.
By the way, the sewing needle 9 and the cloth cutting knife 16 are arranged in a positional relationship as shown in FIG. That is, when viewed from the front side of the sewing machine 1, the cloth cutting knife 16 is disposed on the right side of the sewing needle 9, and the sewing needle 9 and the cloth cutting knife 16 are separated by a distance a in the Y direction.
[0053]
Therefore, when the fabric is cut with a length exceeding both ends of the sewing length as shown in FIG. 14, the right end portion of the cloth cutting knife 16 is line L in the middle of the backward sewing shown in FIG. When positioned at n1, the cloth cutting knife 16 starts to be driven. When the sewing needle 9 reaches the final needle drop position of m4, the cloth cutting knife 16 is in the middle of the over stitching portion and has a distance c corresponding to the length of ("second clearance" + "distance a") ( Fig. 15) Further cloth cutting is required. Therefore, the cloth cutting knife 16 is driven while feeding the cloth while the seam is not formed by the distance c, that is, the sewing needle 9 is not driven, and the cloth of a desired length is cut. Sending the cloth without forming the stitches is referred to as idle feeding here.
Then, after the cutting of the fabric is finished, the cloth is fed in the direction opposite to the idle feed by the cloth feed mechanism, the upper thread is cut by the thread trimming mechanism, and a series of sewing operations is completed.
[0054]
Incidentally, a predetermined force is applied to the upper thread tension applied from the thread tension 19 at the time of sewing in order to finish the seam cleanly. At the time of the above-described idle feeding, the upper thread passing through the sewing needle 9 is moved while being sewn on the cloth, so that the tension at the time of sewing is set to be higher and the upper thread remains applied. Therefore, the upper thread between the fabric and the thread tension 19 is stretched and an excessive force may be applied to the sewing needle 9.
Therefore, during idle feeding, the tension applied to the upper thread by the thread tension 19 is less than that in the table of FIG. A predetermined value is set at 30 “tension during idling”.
[0055]
Further, since the upper thread tension is weak with the idle feeding, the upper thread T is pulled out a little, and the state shown in FIG. In this state, when the cloth is returned to the position of the feed source in the direction opposite to the idle feed, the upper thread T is in a slack state as shown in FIG. Therefore, the rotary solenoid 64 is driven to eliminate the slack of the upper thread T.
[0056]
FIG. 17 specifically shows a needle drop position when sewing with the shape “3” in FIG. 13. As shown in FIG. 17, P1 is the first needle drop position, from P1 to P2, and then to P2, then sew from P3 to P4 and P5 to P6, and thereby the stitched stitch on the left side of line L Finish. Subsequently, from P7 to P8, and then to P8, then from P9 to P10 and then to P11, P12 becomes the sewing end position, thereby finishing the right-handed stitching.
The timing for cutting the cloth in this case starts to cut along the line L2 on the way from P10 to P11. After the sewing is completed at the sewing end position of P12, the cloth is fed in the same manner as described above, and the cloth cutting knife 16 is driven, thereby cutting n3 to n4 exceeding the over stitching range.
Thereafter, the operation of the cloth feed mechanism and the needle swing mechanism returns the relationship between the sewing needle 9 and the cloth to the initial sewing start position, and the upper thread is cut by the thread trimming mechanism.
[0057]
In addition, about the advancing direction of sewing (needle drop position), the pattern different from FIG. 14, FIG. 17 may be sufficient. FIG. 18 shows the direction of sewing advancement in the special mode. 18, (d) is the one shown in FIG. 14, and (a) is the one shown in FIG. In addition, the over stitching can be performed along the flow of the needle drop positions shown in FIGS. 18B, 18C, and 18E to 18H.
[0058]
FIG. 19 shows a block diagram of a control circuit (control means) 200 of the buttonhole overlock sewing machine 1.
A control circuit 200 of the buttonhole sewing machine 1 includes a CPU (Central Processing Unit) 100, a ROM (Read Only Memory) 101, a RAM (Random Access Memory) 102, a Y-feed pulse motor driver 111 that controls and drives each motor, and a base line A feed pulse motor driver 112, a needle swing feed pulse motor driver 113, a sewing machine motor driver 115 that performs drive control of the sewing machine motor 5, a sewing machine motor encoder 119 that encodes the rotation amount of the sewing machine motor 5 as the rotation angle of the upper shaft 6, In addition, an interrupt controller 108 that outputs an interrupt signal to the CPU 100 according to a predetermined interrupt condition is configured.
[0059]
Further, the control circuit 200 is provided with an I / O interface 109 to which the operation panel 110, the above-described various drivers, various switches, and the like are connected. An operation signal is input from the operation panel 110 to the CPU 100 via the I / O interface 109, and a display control signal for operating the display unit and the indicator lamp of the operation panel 110 is output from the CPU 100 side.
In addition, a presser switch 124 for instructing raising / lowering of the cloth presser 15 and a start switch 125 for instructing start of driving of the sewing machine motor 5 are connected to the I / O interface 109.
[0060]
In addition to the sewing machine motor 5, the sewing machine motor driver 115 includes a needle upper position sensor 116 for detecting that the sewing machine needle 9 is in the upper position, and a TG (tachometer) generator for detecting the rotation angle of the upper shaft 6. 118 etc. are connected.
[0061]
The ROM 101 stores control data and control programs for each process performed by the CPU 100, and is a storage medium of the present invention.
The RAM 102 has a work area for the CPU 100 and stores various sewing data of buttonhole stitches input via the operation panel 110.
Further, a floppy disk drive 105 is connected via an I / O interface 109, and a floppy disk (FD) 106 is inserted in the floppy disk drive 105 so that writing or reading can be performed by a usual method. The floppy disk 106 stores, for example, a control program and control data in the buttonhole mode or special mode. Therefore, the floppy disk storing the control program and control data is also a storage medium of the present invention.
The storage medium may be other media such as a compact disk (CD), IC card, IC chip, and microdisk. When these are used as storage media, it is necessary to incorporate the respective drive devices.
[0062]
The CPU 100 uses the predetermined area of the RAM as a work area and, according to the control program stored in the ROM or the floppy disk 106, the data input process of the operation panel 110 and the sewing data created from the data input via the operation panel 110. Based on this, pattern calculation processing for calculating the needle drop position, sewing processing for performing sewing by dropping the needle at the needle drop position calculated by controlling each pulse motor, and the like are performed. That is, the CPU 100 constitutes the control means of the present invention.
[0063]
Next, control processing performed by the control circuit 200 shown in FIG. 19 will be described according to the general flow of FIG.
As shown in the general flow of FIG. 20, when the power is turned on, an operation panel setting process is called in step S1, and various setting processes by the operation panel 110 are performed. Various setting operations using the operation panel 110 are performed until the sewing key 131 is turned on in the next step S2. After the sewing key 131 is turned on, a sewing data creation process is called in the next step S3, and the sewing data is stored. Created. If the sewing key 131 is not on in step S2, the process returns to step S1.
After the sewing data is created, the cloth presser 15 is lowered and output in the next step S4. Subsequently, in the next step S5, the machine origin search process is called, and the Y feed pulse motor 20 / base line feed pulse motor 40 / needle. The machine origin of the swing pulse motor 41 is searched. Subsequently, in the next step S6, the sewing start movement process is called and the Y feed pulse motor 20, the baseline feed pulse motor 40 / the needle swing feed pulse motor 41 are driven to the sewing start position, and then in the next step S7, the cloth is moved. The raising output of the presser 15 is performed, and the process proceeds to the next step S8.
The sewing data creation process in step S3, the machine origin search process in step S5, and the sewing start movement process in step S6 are the same processes as described in JP-A-11-9862.
[0064]
In step S8, the sewing key 131 is checked, and when the sewing key 131 is turned on, the process returns to the step S1 and the operation panel setting process is performed again. If the sewing key 131 is not turned on, the next step Proceed to S9. In step S9, the presser switch 124 is checked. When the presser switch 124 is on, the process proceeds to the next step S10, and when the presser switch 124 is not on, the process returns to step S8.
In step S10, it is determined whether or not the cloth presser 15 is being lifted. If the cloth presser 15 is being lifted, a downward output of the cloth presser 15 is performed in the next step S11. The cloth presser 15 is raised and the process returns to step S8.
After the presser foot lowering output, in the next step S13, the presser switch 124 is checked, and when the presser switch 124 is on, the presser foot 15 is raised in step S12, and the process returns to step S8. If the presser switch 124 is not turned on, the process proceeds to the next step S14. In step S14, the start switch 125 is checked. When the start switch 125 is on, the process proceeds to the next step S15, and when the start switch 125 is not on, the process returns to step S13.
[0065]
In step S15, a sewing process is called and sewing is started. After the end of sewing, in the next step S16, the tension of the yarn for the idle feed of the cloth feed mechanism is output, and in step S17, the Y feed pulse motor 20 is driven to the knife drive position, that is, the idle feed process. I do.
Next, a process of driving the cloth cutting knife 16 is performed in step S18, and a process of moving (returning) the Y feed pulse motor 20 to the sewing start position by driving the Y feed pulse motor 20 in the opposite direction to that in the idle feed is performed in step S19. Next, in step S20, a process for driving the rotary solenoid 64 to eliminate the slack of the yarn is performed.
Thereafter, in step S21, the process of raising and outputting the cloth presser 15 is performed and the thread cutting is performed, and the process returns to step S8.
[0066]
Next, FIG. 21 shows a subroutine for sewing (step S15 in FIG. 20). First, in step S151, the total number of stitches is set as the number of remaining stitches, and in the next step S152, the sewing machine start output is performed. Then, the process proceeds to the next Step S154.
In step S154, it is determined from the pulse from the sewing machine motor encoder 119 whether or not the sewing machine status is rotating. If it is rotating, the process proceeds to the next step S155, and if not rotating, the general flow (FIG. The process proceeds to step S16 of 20).
In step S155, it is determined whether or not there is a needle up position interrupt request to the interrupt controller 108. If there is, a needle up position interruption process is performed in step S156, and then the process returns to step S154. If it is determined in step S155 that there is no needle up position interrupt request, the process directly returns to step S154.
[0067]
Next, FIG. 22 shows a subroutine for needle up position interruption processing (step S160 in FIG. 21). First, in step S161, 1 is decremented from the number of remaining stitches to obtain a new number of remaining stitches. Subsequently, in the next step S162, the needle count is incremented by 1, and then the process proceeds to the next step S163.
In step S163, it is checked whether or not the number of remaining stitches is 0. If it is 0, the sewing machine stop output is performed in the next step S164, and if it is not 0, the process proceeds to step S165 as it is.
Then, in the next step S165, it is checked whether or not the needle count is Mn. This Mn value determines the timing of cloth cutting (medium knife) in the middle of over stitching. When the number of sewing needles reaches Mn, the cloth is cut. If it is Mn in step S165, the process proceeds to the next step S166, and if it is not Mn, this flow is finished as it is. In step S166, the cloth cutting knife is lowered and the cutting process is performed. Then, in the next step S167, n is incremented by 1, and the flow is finished.
[0068]
According to the above buttonhole overlock sewing machine 1, in addition to the buttonhole overlock stitching by providing a special mode in which the overcut stitching length can be cut and the cloth can be cut in the range exceeding the stitch length of the overlock stitching. It can be suitably used for sewing that requires over stitching and cutting of the fabric.
For example, when the shape “1” or “2” shown in FIG. 13 is selected for the sewing of the shoulder portion of the running shown in FIG. Thus, it is possible to carry out over stitching from one end to the other end, and to cut off an excess portion along the seam, and the work efficiency is drastically improved in one step.
[0069]
Also, using the buttonhole overlock sewing machine 1, a completely different sewing method can be used for sewing the hook portion of the brassiere shown in FIG.
For example, as shown in FIG. 23A, first, a number of best dates 304 are sewn on a tape-like hook cloth 302.
Next, the shape “3” of FIG. 13 is selected on the buttonhole overlock sewing machine 1, and the line L3 is applied while applying overlock 306 as shown in FIG. Cut along. Thereby, the hook cloth 302 to which the best time 304 is sewn is cut into individual pieces.
The method of FIG. 23 eliminates the need for the fine work of sewing the best 304 as shown in FIG. 25 on each hook 303 so that the work is simple and the workability is improved. To do. In addition, since both end portions of the hook portion 303 are only stitched by over stitching, heat is not applied and can not be fooled as in the case of ultrasonic waves, and the touch is good and good comfort can be obtained.
The buttonhole overlock sewing machine 1 of the present invention is not limited to the above-described examples of use, and is suitably used for various types of sewing that require cutting the fabric while overlocking at a portion where the sewing length is relatively short. it can.
[0070]
The cycle sewing machine of the present invention is not limited to the above embodiment and can be changed as appropriate.
For example, the cloth cutting in the special mode is a combination of “medium knife” (step S166 in FIG. 22) and “rear knife” (step S18 in FIG. 20) to be cut after sewing. May be driven several times.
Further, the positional relationship between the cloth cutting knife and the sewing needle is not limited to the above embodiment. Further, a blade having a width wider than that of the cloth cutting knife 16 may be used, and cutting may be performed by driving the cloth cutting knife only once regardless of whether the knife is a middle knife or a rear knife.
[0071]
【The invention's effect】
According to the first aspect of the present invention, the cloth is cut along the seam while forming the seam under the control of the control means, and therefore, the seam is formed and the cloth is cut by the sewing machine. Since it is performed once or continuously, the work efficiency of the sewing work that requires the formation of stitches and the cutting of the cloth is improved.
[0076]
  Claim6According to the invention described in (3), when the upper thread is slack, it can be appropriately pulled up.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an appearance of a buttonhole overlock sewing machine as an example to which the present invention is applied.
2 is a schematic perspective view of an internal mechanism of the buttonhole overlock sewing machine of FIG. 1. FIG.
FIG. 3 is a schematic perspective view of an internal mechanism, showing a state viewed from the side opposite to FIG. 2;
FIG. 4 is a schematic diagram for explaining the operation of a needle swing mechanism.
FIG. 5 is a perspective view showing a mechanism for driving a cloth cutting knife.
FIG. 6 is a plan view showing a thread trimming mechanism.
7 is a side view showing the thread tension of FIG. 1. FIG.
FIGS. 8A and 8B are diagrams showing an outline of a rotary solenoid, in which FIG. 8A shows a normal state, and FIG. 8B shows a state in which the rotary solenoid is operated and an upper thread is wound;
FIG. 9 is a front view of an operation panel.
FIG. 10 is a chart showing setting items in a buttonhole mode.
FIG. 11 is a chart showing setting items in a special mode.
FIGS. 12A and 12B are diagrams for explaining the length of a cloth cut by a cloth cutting knife and the length of an over stitch portion, where FIG. 12A shows a buttonhole mode and FIG. 12B shows a special mode;
13 is a diagram illustrating an example of a shape that can be set by “shape” in the data item of FIG. 11;
FIG. 14 is a diagram for explaining data setting items and needle drop positions in a special mode.
FIG. 15 is a schematic diagram showing a positional relationship between a sewing needle and a cloth cutting knife.
FIG. 16 is a view for explaining the slack of the upper thread at the time of idle feeding.
FIG. 17 is a diagram for explaining another example of the stitch formed in the special mode.
FIG. 18 is a diagram showing variations in the sewing traveling direction in the special mode.
FIG. 19 is a block diagram showing a control circuit of the buttonhole overlock sewing machine of FIG. 1;
20 is a flowchart showing a general flow of processing performed by the control circuit of FIG. 19;
FIG. 21 is a flowchart showing a subroutine of sewing processing.
FIG. 22 is a flowchart showing a sub-needle position interruption process subroutine;
23 is a diagram for explaining a case where a hook member of a brassier is sewn with the buttonhole stitch machine of FIG. 1. FIG.
FIG. 24 is a view for explaining sewing of a shoulder portion of a conventional running.
FIG. 25 is a view for explaining a conventional hook member and best sewing.
[Explanation of symbols]
1 Sewing machine frame
2 beds
3 Vertical trunk
4 arms
5 Sewing machine motor
6 Upper shaft
8 needle bar
9 Sewing needle
11 Lower shaft
12 Kettle
14 Cloth holding plate (cloth holding member)
15 Cloth presser (cloth holding member)
16 Cloth cutting knife
18 Needle bar swing base
19 Thread tension
20 Y feed pulse motor
22 Feed axis
24 connecting arm
30 Air cylinder for cloth cutting knife
31 Female mounting plate
40 Baseline feed motor
41 Needle swing feed motor
43 Baseline arm
44 Lever for baseline
45 Link
46 Needle swing cam lever
47 Needle swing lever
48 connecting shaft
49 Needle swing arm
54 Needle swing cam
55 Swing arm
56 Swing lever
60 Thread tension solenoid
64 Rotating solenoid
70 Upper thread trimmer scissors
74 Thread trimming link
100 CPU (control means)
101 ROM (storage medium)
102 RAM
105 Floppy disk drive
106 Floppy disk (storage medium)
110 Operation panel

Claims (9)

A cloth holding member that holds the cloth and is movable along at least one direction;
A sewing needle that enables a swing motion in a direction intersecting the one direction;
In a cycle sewing machine comprising a cloth cutting knife provided in the vicinity of the needle and capable of moving up and down,
Forming a first row of stitches and cutting the fabric with the cloth cutting knife along the stitches; forming two rows of stitches; and cutting the cloth between the two rows of stitches. An operation panel capable of selecting one of the second sewing patterns for cutting the cloth with a knife and setting a cutting length exceeding the stitch length of the seam;
By forming the stitches of the first sewing pattern or the second sewing pattern by the needle swinging movement of the sewing needle and the movement of the cloth holding member, and with the cutting length set along the stitches, Comprising control means for controlling the cloth cutting knife to cut the cloth ;
The operation panel is capable of selecting a third sewing pattern for forming a buttonhole while performing overlock stitching, and is capable of individually setting the cutting length and the stitching length of the seam. . The cycle sewing machine according to claim 1, wherein a movement amount of the cloth when the cloth is moved along the one direction can be set by the cloth holding member without forming a seam. The cycle sewing machine according to claim 1 or 2 , wherein the seam has a zigzag shape in which bark stitches are formed at both ends. The cycle according to any one of claims 1 to 3 , wherein the cloth cutting knife has a knife length shorter than a set cutting length, and cuts the cutting length by moving up and down a plurality of times. sewing machine. The cycle sewing machine according to any one of claims 1 to 4 , wherein the cloth cutting knife is provided at a position away from the sewing machine needle by a predetermined distance in the one direction. If the upper thread slack between the needle and the fabric cycle sewing machine according to claim 1-5, characterized in that a pulling means to pull the upper thread. The cycle sewing machine according to any one of claims 1 to 6 , wherein a distance between a stitch and a cutting position by a cloth cutting knife can be set. The cycle sewing machine according to any one of claims 1 to 7 , wherein the cloth has an elongated shape, and the one direction is a width direction of the cloth. The cycle sewing machine according to any one of claims 1 to 8 , wherein the sewing machine is a buttonhole sewing machine.

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