JP4392639B2 - Hole sewing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a boring machine, and in particular, can be formed with an improved seam shape at a back anchoring portion of a boring seam.
[0002]
[Prior art]
Conventionally, a boring machine has been provided with a cloth feed mechanism for feeding a work cloth and a sewing mechanism for forming a stitch on the work cloth, and the cloth feed mechanism and the sewing mechanism are controlled by a control device to be applied to the work cloth. A perforated seam including a pair of staggered portions (outward staggered portion and reverse staggered portion) and a pair of tacking portions (front tacking and back tacking portions) is formed. As with a general sewing machine, a bobbin sewing machine is provided with a thread tension mechanism and a balance mechanism, and the boring stitch formed on the work cloth is tightened by these mechanisms.
[0003]
The cloth feed mechanism has a feed base, presser foot, stepping motor, etc., with the work cloth being pressed against the feed base by the presser foot, the feed base and presser foot are driven integrally by the stepping motor, and the work cloth is also The cloth is fed together. In order to form a holed stitch, a long and narrow needle hole is formed on the feed base in the cloth feed direction in which the sewing needle is inserted. Incidentally, in a boring machine, it is usually possible to form a button hole inside a boring seam (a boring seam formation scheduled portion) after, during or before the sewing of the boring seam.
[0004]
By the way, the hole stitches are continuously sewn generally in the order of the forward staggered portion → the back tacking portion → the reverse staggered portion → the front tacking portion. Of these, as shown in FIG. 6 according to the embodiment, the back tacking portion is usually as shown in FIG. 7 according to the embodiment after sewing the front stitch 70 whose amplitude direction is orthogonal to the cloth feeding direction. Similarly, the rear stitches 76 whose amplitude direction is orthogonal to the cloth feeding direction are continuously sewn.
[0005]
[Problems to be solved by the invention]
As shown in FIGS. 6 and 7, in the conventional hole sewing machine, the distance between two continuous needle drop points of the front stitch 70 and the rear stitch 76 of the normal back tacking portion is long. In the case of work cloths with high elasticity such as thin work cloths and knits, there is a risk that wrinkles and dents may occur near the back-stop part of the work cloth due to tightening of the seam of the back-stop part formed on the work cloth. is there.
[0006]
Further, since there are many places where the needle drop point of the rear stitch 76 is located near the needle drop point of the front stitch 70 of the normal back tacking portion, the rear stitch 76 is set after the front stitch 70 is sewn. When sewing, the resistance of the sewing needle to pass through the work cloth in the vicinity of the needle drop point (the thread entanglement point of the upper thread and the lower thread) of the front stage seam 70 is increased. At this time, when a highly elastic work cloth is used for sewing, the work cloth may be stretched and drawn into the needle hole together with the sewing needle.
[0007]
In addition, when a highly stretchable work cloth is used for sewing, even if sewing is performed based on preset sewing data for a normal hole stitching seam, processing by tightening the seam of the back tack stop portion After sewing, due to the stretch of the cloth, the multiple needle drop points on the reverse staggered part side are shifted in the fabric feed direction with respect to the multiple needle drop points on the forward staggered part side of the back stick stop part, and the back tack is stopped. The part may have a distorted shape.
[0008]
In this way, in the conventional hole sewing machine, there is a possibility that wrinkles and dents may occur near the back tacking portion of the work cloth, and that the work cloth may be drawn into the needle hole together with the sewing needle, There are problems such as that the back tacking portion tends to be distorted, and if this is the case, a beautiful holed seam cannot be formed and the quality deteriorates. It should be noted that the above-described problem is unlikely to occur in the front tacking portion because there is a reinforcing effect due to the stitching performed at the start and end of the stitching of the seam.
[0009]
The object of the present invention is to generate wrinkles and dents near the back-stop portion of the work cloth, bite into the needle hole of the work cloth, and distortion, especially when a work cloth with high elasticity such as knit is used for sewing. It is another object of the present invention to provide a boring machine that can prevent the formation of a back tack stop portion and the like, and can form a beautiful bouncing seam to prevent quality deterioration.
[0010]
According to another aspect of the present invention, there is provided a hole sewing machine comprising a cloth feeding means for feeding a work cloth, a sewing means for forming stitches on the work cloth, a pair of staggered portions and a pair by controlling the cloth feeding means and the sewing means. In the boring machine comprising the control means for forming the bouncing seam including the bar tacking portion, the control means has an amplitude direction when forming the back tack preventing portion of the pair of bar tacking portions. After sewing the zigzag front stage seam that becomes the cloth feed direction, the sewing machine and the sewing machine are sewn in such a way that the back stage stitch that consists of normal tacking seams whose amplitude direction is orthogonal to the cloth feed direction is continuously sewn. The means is controlled.
[0011]
In this boring machine, the work cloth is fed by the cloth feed means, the stitches are formed on the work cloth by the sewing means, and the cloth feed means and the sewing means are controlled by the control means, and a pair of staggered portions and a pair are formed. A hole seam including the barbed portion is formed. In particular, when the cloth feeding means and the sewing means are controlled by the control means to form the back tack preventing portion of the pair of tack preventing portions, the zigzag front stage stitch whose amplitude direction is the cloth feeding direction is sewn. After that, the subsequent stitches composed of the normal tacking stitches whose amplitude direction is orthogonal to the cloth feeding direction are continuously sewn.
[0012]
The front stitch has a zigzag shape with the amplitude direction being the cloth feed direction, and the front stitch is to be formed before the rear stitch is formed of the normal tack seams whose amplitude direction is orthogonal to the cloth feed direction. Thus, the work cloth can be reinforced. Therefore, even when work cloths with thin fabric thickness or work cloths with high elasticity such as knit are used for sewing, there are wrinkles and dents in the vicinity of the back tack stop part of the work cloth by tightening the seam of the back tack stop part. It can be prevented from occurring. Since the front stitches of the back tacking portion are covered with the subsequent stitches, the appearance becomes a normal tacking stitch and the appearance is good.
[0013]
[0014]
[0015]
[0016]
Claim 2 The perforated sewing machine according to claim 1 of In the present invention, the control means is provided with a first mode for forming a back tack stop portion comprising the front stitch and the back stitch, and a back stitch stop portion comprising only the back stitch without the front stitch. Further, mode setting means for selectively setting to the second mode is provided. It is possible to easily select the shape of the back tacking portion, and therefore, the back tacking portion including the front stitch and the rear stitch or the rear stitch without the front stitch is included. It is possible to easily and reliably form the back tack stop.
[0017]
[0018]
[0019]
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the present embodiment, for example, in a so-called buttonhole sewing machine that forms the hole seam 60 in FIG. 5 and forms the button hole 65 inside the hole seam 60 on the work cloth. It is an example when the invention is applied. However, description will be made with reference to the front and the left in FIG. In the following, the reference numerals of the hole stitching, the button hole and the like are mainly referred to as the square hole stitching 60 and the button hole 65 of FIG.
[0021]
As shown in FIG. 1, a boring machine M includes a sewing machine table 1, a sewing machine motor 2, and a foot pedal 3 for starting or stopping each drive unit (described later) including the sewing machine motor 2. And an operation panel 4 for inputting and setting a plurality of parameters for defining the shape and size of the hole stitch 60, and a control device 5 for driving and controlling each of the drive units.
[0022]
The perforated sewing machine M has a sewing machine main body having a bed portion 6, a pedestal column portion 7, and an arm portion 8. As shown in FIGS. 2 to 4, the work cloth is fed forward and backward to the sewing machine main body. A cloth feed mechanism 10, a sewing mechanism 30 that forms a stitch on the work cloth, and a button hole forming mechanism 50 that forms a button hole 65 in the work cloth are provided. The control device 5 controls the cloth feed mechanism 10 and the sewing mechanism 30. Is controlled to form a holed seam 60, and the button hole forming mechanism 50 is controlled to form a buttonhole 65 inside the holed seam 60.
[0023]
As shown in FIG. 3, the cloth feed mechanism 10 includes a feed base 11, a presser foot 12, a stepping motor 13, and the like, and the stepping motor 13 is in a state where the work cloth is pressed against the feed base 11 by the presser foot 12. Thus, the work cloth is also fed back and forth integrally by driving the feed base 11 and the presser foot 12 back and forth integrally. The feed base 11 is formed in a plate shape that is long in the front-rear direction, and is guided by a pair of left and right guide plates 14 that are fitted in the upper surface portion of the bed portion 6 so as to be movable in the front-rear direction. A needle hole 11 a for forming a hole seam 60 and a button hole 65 is formed at the front end of the feed base 11.
[0024]
A movable member 15 is fixed to the lower surface of the rear end of the feed base 11, and a movable member 17 is connected to the rear side of the movable member 15 via a long connecting rod 16 in the front-rear direction. The rear end of the presser arm 18 attached to the front end is pivotally supported about the left and right axis. The presser foot 12 is urged downward by a biasing member (not shown) through a presser arm 18, and is integrated with the presser arm 18 by a presser lifting mechanism (not shown) driven by operation of the foot pedal 3. The presser foot 12 is raised and lowered. The presser lifting / lowering mechanism is provided with a stepping motor 22 (see FIG. 14) that is driven and controlled so that the presser foot 12 can be raised and lowered and its height can be adjusted according to the operation amount of the foot pedal 3.
[0025]
The connecting rod 16 is inserted and fixed to the left end portions of the movable members 15 and 17 so as to be inserted therethrough, and is guided and supported on the sewing machine frame through a pair of bearings 19 on both front and rear sides of the movable members 15 and 17. Has been. On the right side of the connecting rod 16, a rod 20 that is long in the front-rear direction is fixed to the sewing machine frame, and the right end portion of the movable member 17 is guided and supported by the rod 20 through a bearing 17a so as to be movable back and forth. A driving pulley 13a is fixed to the output shaft of the stepping motor 13, a driven pulley (not shown) is pivotally supported by the sewing machine frame behind the driving pulley 13a, and an endless belt 21 is stretched around these pulleys. . When the movable member 17 is connected to a part of the belt 21 and the stepping motor 13 is driven, the movable members 15, 17, the feed base 11, and the presser foot 12 are integrally driven back and forth via the belt 21. .
[0026]
2 and 4, the sewing mechanism 30 is supplied from a needle bar 31, a sewing needle 32 attached to the lower end of the needle bar 31, and an upper thread supply source (not shown) such as a thread spool to the sewing needle 32. A thread tension mechanism 34 that applies tension to the upper thread 33 for sewing, and a balance 35 on which a middle portion of the upper thread 33 extending from the thread tension mechanism 34 to the sewing needle 32 is hung.
[0027]
The needle bar 31 and the sewing needle 32 are reciprocated up and down by a needle bar up-and-down moving mechanism (not shown) driven by the sewing machine motor 2, and below the feed base 11 by a thread catcher (not shown) in the bed 6. The upper thread 33 in the vicinity of the sewing needle 32 that moves up and down is captured and entangled with the lower thread extending from a bobbin (not shown) to form a stitch. Further, the needle bar 31 is driven to swing left and right by a stepping motor 36 (see FIG. 14), so that it is possible to sew a hole seam 60 having a lateral width on a work cloth fed forward and backward. The balance 35 is largely reciprocated up and down by a common scale drive mechanism (not shown) that is shared with the needle bar vertical movement mechanism driven by the sewing machine motor 2, and the upper thread 33 is pulled by the rising balance 35, thereby adjusting the thread tension. Friction resistance acts on the upper thread 33 by the mechanism 34 to apply tension, and the seam formed on the work cloth is tightened.
[0028]
As shown in FIG. 4, the thread tension mechanism 34 includes first and second thread tension dishes 40 and 41 and an auxiliary thread tension dish 42. After the upper thread 33 extending from the upper thread supply source is guided by the thread guide members 33a, 33b, etc., it is hung on the first thread tension tray 40, the auxiliary thread tension tray 42, and the second thread tension tray 41 in this order. From there, it is guided upward by the thread guide member 33c and hung on the balance 35, and from there, it is guided by the guide members 33d, 33e, etc. and supplied to the sewing needle 32. The first thread tension tray 40 and the auxiliary thread tension 42 are in a tension application state in which tension is constantly applied to the upper thread 33. The first thread tension tray 40 is configured to be switchable between a tension applying state and a tension releasing state, and this switching can be performed by a tension switching mechanism (not shown) having a solenoid actuator 45 (see FIG. 14).
[0029]
As shown in FIG. 2, the button hole forming mechanism 50 includes a cutter 51, a cutter holder 52, a cutter attachment shaft 53, a cutter driving solenoid actuator 54 (see FIG. 14), and the like. A cutter holder 52 is coupled to the lower end of the cutter mounting shaft 53, and the cutter 51 is fixed to the cutter holder 52 with screws 52a. By the solenoid actuator 54, the cutter 51 is driven up and down integrally with the cutter mounting shaft 53 and the cutter holder 52, and the cutter 51 is dropped onto the work cloth to form the button hole 65.
[0030]
As shown in FIG. 5, the hole seam 60 includes a left (outward) staggered portion 61, a right (returned) staggered portion 62, a front tack stop portion 63, and a back tack stop portion 64, and the front tack stop portion 63. The left zigzag portion 61, the back tack stop portion 64, the right zigzag portion 62, and the remaining portions of the front tack stop portion 63 are sewn in this order. In the perforated sewing machine M, when the back tacking portion 64 of the pair of tacking fastening portions 63 and 64 is a square shape, it is up to the upper left corner or near the corner of the planned back tacking portion. 7 can be continuously sewn after one of the various front stitches 70 to 75 shown in FIGS. 6 and 8 to 12 is sewn. .
[0031]
The front-stage seam 70 in FIG. 6 and the rear-stage seam 76 in FIG. 7 are normal barb seams whose amplitude direction is orthogonal to the cloth feeding direction (front-rear direction). The front stitches 71 to 73 in FIGS. 8 to 10 are zigzag stitches whose amplitude direction is the cloth feed direction, and the front stitches 74 and 75 in FIGS. 11 and 12 are orthogonal to the cloth feed direction. This zigzag stitch is narrower than the normal rear stitch 76 in FIG. It should be noted that the front stitches 71 to 75 are omitted, and the back tacking portion consisting only of the rear stitches (that is, the normal tacking stitches) is the front stitching 70 in FIG. 6 and the rear stitching 76 in FIG. It is a stitch that combines.
[0032]
Further, in this perforated sewing machine M, sewing data of a plurality of needle drop points is received for the rear stitch portion 76 of the back tacking portion 64 of the pair of tacking portions 63 and 64, as shown in FIG. As described above, the plurality of needle drop points on the return zigzag part 62 (right) side can be corrected so as to be relatively moved in the cloth feeding direction by a minute distance ra with respect to the plurality of needle drop points on the forward stagger part 61 (left) side. The minute distance value ra can also be set.
[0033]
Next, a control system of the boring machine M will be described.
As shown in FIG. 14, the control device 5 includes a microcomputer mainly composed of a CPU 5 a, a ROM 5 b, and a RAM 5 c, a signal from the pedal position detection sensor 3 a corresponding to the operation state of the foot pedal 3, and a signal from the operation panel 4. A drive signal is output to the input interface 5d to which signals and the like are input, and the drive circuits 80 to 85 for driving the sewing machine motor 2, the stepping motors 13, 22, and 36, and the solenoid actuators 45 and 54, and to the operation panel 4. And an output interface 5e for outputting a control signal such as a display state, and these are connected by a bus 5f.
[0034]
In the ROM 5b of the control device 5, a setting processing program for performing various settings related to sewing such as a plurality of parameters for defining the shape and size of the hole stitch 60 using the operation panel 4 and a plurality of parameters are used. An arithmetic processing program for calculating and processing the sewing data (needle drop data) and button hole data (cutter drop position data), and the cloth feed mechanism 10, sewing mechanism 30, button hole forming mechanism 50 and the like based on the calculated data. A control program for driving control is stored.
[0035]
As shown in FIG. 15 to FIG. 18, as described in the contents column, as a plurality of parameters, the rotation speed of the staggered portion, the hole stitching shape, the cutter dimensions, the cutter Fall There is a staggered stitch length, staggered pitch, etc., and a number (number described in the number column) is displayed on the display section of the operation panel 4, and a parameter corresponding to the number is set. be able to.
[0036]
Each parameter (for example, a staggered pitch of the number “04”) can be set within a setting range (0.20 to 2.00 mm), and at the time of setting, one of up / down keys (not shown) of the operation panel 4 is set. Increase / decrease by one step (0.05 (mm)) by pressing once. An initial value for each parameter (0.35 (mm) for the zigzag pitch of number “04”) is provided, and this initial value is basically changed and set. The ROM 5b of the control device 5 stores setting range data, step data, and initial value data in association with a plurality of parameter numbers. In FIG. 5, a is the cutter size of the number “02”, b is the staggered pitch of the number “04”, c is the staggered width of the number “05”, d is the front tacking length of the number “20”, e Represents the backstop length of the number “30”.
[0037]
Here, it is possible to form the normal front seam 70 of FIG. 6 by setting the front stitch shape of the back tack stop of the number “33” in FIG. 16 to (0; normal), and set it to (1; chevron). 8 to 10 can be formed, and the front stitch shape of the back-end stopper can be set to (2; narrow zigzag shape) to form the front stitch 74 of FIG. 12), it is possible to form the front stitch 75 of FIG.
[0038]
When the front stitch shape of the back tack stop of the number “33” is set to (1; mountain shape), the number of stitches of the front stitch X (left and right) of the number “34” and the front stitch Y of the number “35” (Fore-and-aft direction) The number of stitches and the number become effective. For example, the number of front stitches X stitches can be set to (8) and the number of front stitches Y stitches can be set to (2) to sew the front stitch 71 in FIG. 9 can be sewn by setting the number of front stitches X stitches to (8) and the number of front stitches Y stitches to (3), and the number of front stitches X stitches can be set to (5). The number of stitches Y stitches is set to (2), and the front stitch 73 in FIG. 10 can be sewn.
[0039]
Thus, in the setting processing program, the front stitch shape or the like of the back tack stop portion can be set. When the back tack stop portion is a square shape, the control device 5 controls the front stitch shape. When the cloth feed mechanism 10 and the sewing mechanism 30 are driven and controlled on the basis of a plurality of parameters including the like, and the back anchorage portion is formed, various front stitches 70 to 70 in FIG. 6, FIG. 8 to FIG. 7 is sewn continuously after one of the front stitches 75 is sewn.
[0040]
In addition, when sewing one front stitch among the various front stitches 71 to 75 shown in FIGS. 8 to 12 and the like, a back anchoring portion formed of the front stitch and the rear stitch 76 is formed. In the first mode, when the front stitch 70 in FIG. 6 is sewn, the special front stitch is omitted, and the second mode is formed in which the back anchoring portion including only the rear stitch is formed. The operation panel 4 for alternatively setting the two modes and the control device C having the setting processing program correspond to the mode setting means.
[0041]
In addition, by using the parameter “36” for setting the back stitch feed direction needle drop point correction, a plurality of needle drop points on the return zigzag portion side are relatively moved in the cloth feed direction with respect to a plurality of needle drop points on the forward zigzag portion side. A small distance ra can be set, and in the calculation process, a plurality of needles on the outward staggered portion side are received by receiving sewing data of a plurality of needle drop points of the back tacking portion of the pair of tacking portions. Correction is made so that a plurality of needle drop points on the return staggered portion side are moved relative to the drop point by a minute distance ra in the cloth feed direction (corresponding to the sewing data correction means), and the corrected sewing data can be created. It has become.
[0042]
The control executed by the control device 5 will be briefly described based on the flowchart of FIG. 19 (Si (i = 1, 2, 3,... In the figure indicates each step)). At the same time, this control is started. First, initial setting (S1) is performed, and then parameter setting processing (S2) is performed. In this parameter setting process, for example, immediately after the power is turned on, initial values stored in the ROM 5b are set in the plurality of parameters shown in FIGS. 15 to 18, but as described above, using the operation panel 4, Multiple parameter settings can be changed and set again.
[0043]
Thereafter, when the parameter setting process is completed (S3; Yes), the parameter setting value is read (S4). Based on the setting value, the sewing data is calculated (S5) and the cutter drop position data is calculated (S6). Is done. Then, when the foot pedal 3 is depressed, a hole stitch formation process (S7) is executed, and the cloth feed mechanism 10 and the sewing mechanism 30 are controlled based on the sewing data, and the set tacking portion shape is set. The resulting seam is formed. Next, a button hole forming process (S8) is executed, a button hole is formed inside the hole stitching, and the process returns to S2. As for the button hole forming process, in this flowchart, a so-called rear knife is formed to form a button hole after forming a hole stitch, but the button hole can be formed before or during the sewing of the hole stitch. You may do it.
[0044]
According to this boring machine M, the front stitch shape of the back tack stop of number “33” in FIG. 16 is set to (1; mountain shape), and the control device 5 controls the cloth feed mechanism 10 and the sewing mechanism 30. Then, when forming the back tack 64 of the pair of tacks 63, 64, the zigzag front stitches 71 to 73 of FIGS. 8 to 10 whose amplitude direction is the cloth feeding direction are sewn. Therefore, it is possible to continuously sew the rear-stage stitch 76 composed of the normal tacking stitches of FIG. 7 whose amplitude direction is orthogonal to the cloth feeding direction.
[0045]
In other words, since the work cloth can be reinforced by forming the front seams 71 to 73 before the rear seam 76 is formed on the work cloth, the work cloth having a high stretch property such as a thin work cloth or a knit is used. Even when the cloth is used for sewing, it is possible to prevent wrinkles and dents from being generated in the vicinity of the backstop portion 64 of the work cloth by tightening the stitches of the backstop portion 64, and to perform the front stage sewing of the backstop portion 64. Since the eyes 71 to 73 are also covered with the rear stage seam 76, the appearance becomes a normal tacking seam and the appearance is good.
[0046]
16 is set to (2; narrow zigzag shape) or (3; narrow zigzag taper shape), and the control device 5 causes the cloth feed mechanism 10 and the sewing mechanism to be set. 30 and the zigzag of FIG. 11 and FIG. 12 in which the amplitude direction is a direction orthogonal to the cloth feeding direction when forming the back tacking section 64 of the pair of tacking sections 63 and 64. After the first-stage seams 74 and 75 are sewn, the rear-stage seams 76 made of the normal tack seams in FIG. 7 whose amplitude direction is perpendicular to the cloth feeding direction and wider than the front-stage seams 74 and 75. Can be sewn continuously.
[0047]
Therefore, the plurality of needle drop points of the front stitches 74 and 75 are located on the inner side with respect to the plurality of needle drop points of the rear stitch 76, that is, in the vicinity of the needle drop points of the front stitches 74 and 75. Since the needle drop point of the seam 76 becomes inconsistent, and when the rear stage seam 76 is sewn after the front stage seams 74 and 75 are sewn, the sewing needle 32 smoothly inserts the work cloth without hindrance. Even when the cloth is used for sewing, it is possible to prevent the work cloth from being stretched and drawn into the needle hole 11a together with the sewing needle 32, and the front stitches 74 and 75 of the back anchoring portion 64 are also the same as described above. Since it is covered with the back-stage seam 76, the appearance becomes a normal tacking seam and the appearance is good.
[0048]
It is possible to easily select the shape of the back tacking portion by using the operation panel 4, and thus, one of the front stitches 70 to 75 of various front stitches 70 to 75 shown in FIGS. 6 and 8 to 12. It is possible to easily and reliably form the back tacking portion that combines the eye and the rear stitch 76 of FIG. Further, when forming an angle-shaped front stitch, the number of front stitches X stitches and the number of front stitches Y stitches can be easily set.
[0049]
Here, in the case where a highly stretchable work cloth is used for sewing, due to the stretch of the work cloth caused by the tightening of the stitches of the back tack stop portion 64, the outward staggered portion of the back tack stop portion 64 after sewing is performed. The plurality of needle drop points on the reverse staggered portion side may be displaced in the cloth feeding direction with respect to the plurality of needle drop points on the side, and the back tacking stop portion 64 may be distorted.
[0050]
In such a case, the direction in which the plurality of needle drop points on the return zigzag portion side deviate from the plurality of needle drop points on the forward staggered portion side of the back tack stop portion 64 after sewing is set as the shift direction and the distance is defined as When the amount of deviation is set, the correction amount ra for the back-sticking feed direction needle drop point correction of the number “36” in FIG. 16 is set to an appropriate value, and the return zigzag portion is set with respect to a plurality of needle drop points on the forward zigzag portion side. The plurality of needle drop points on the side can be corrected so as to be relatively moved in the direction opposite to the shift direction by the shift amount. As a result, the back-clamping portion 64 having a distorted shape is sewn on the reverse side, but after the sewing, a plurality of needle drop points on the outward staggered portion side of the back-clamping portion 64 are sewn. As the plurality of needle drop points are displaced in the displacement direction, it is possible to form a beautiful backstop portion 64 that is not distorted.
[0051]
When forming the front tacking stop 63, the zigzag front stage stitch as shown in FIGS. 8 to 10 in which the amplitude direction is the cloth feed direction is sewn, and then the amplitude direction is orthogonal to the cloth feed direction. It is also possible to continuously sew back-stage stitches made of ordinary tack-stopped seams such as those shown in FIGS. 11 and 12 in which the amplitude direction is perpendicular to the cloth feed direction. After sewing the zigzag front stage seam like this, the back side seam consisting of the normal tacking seam as shown in FIG. 7 is continuous, with the amplitude direction orthogonal to the cloth feed direction and wider than the front stage seam. You may comprise so that it may sew. Further, the amplitude of the front stitch of the zigzag in FIG. 11 and FIG. 12 which is narrow may be variably set.
[0052]
Further, the rear stitches may be omitted, and a back tack stop portion including only the front stitches 71 to 73 as shown in FIGS. 8 to 10 may be formed. However, it is necessary to reduce the pitch in the X direction so that the number of front stitches X (left and right direction) can be increased. In addition, the present invention can be implemented in various forms without departing from the spirit of the present invention.
[0053]
【The invention's effect】
According to the hole sewing machine of claim 1, when the cloth feeding means and the sewing means are controlled by the control means to form the back tacking portion of the pair of tacking portions, the amplitude direction is the fabric feeding direction. After the zigzag front stage seam is sewn, it is possible to continuously sew the back stage seam consisting of a normal tacking seam whose amplitude direction is orthogonal to the cloth feed direction. Since the work cloth can be reinforced by forming the front stage seam before forming the back seam on the work cloth, it is possible to sew work cloths with thin cloth thickness or highly stretchable work cloth such as knit. In Even if it is provided, it is possible to prevent wrinkles and dents from being generated near the back-stop part of the work cloth by tightening the seam of the back-stop part, and the front-stage seam of the back-stop part is covered with the back-stage seam. Therefore, the appearance becomes a normal tacking seam and the appearance is good.
[0054]
[0055]
Claim 2 According to the present invention, the mode setting means provided in the control means eliminates the first mode in which the back-end preventing portion including the front stage stitch and the rear stage stitch is formed, and the rear stage by omitting the front stage stitch. It can alternatively be set to the second mode for forming the back tacking portion consisting only of the seam. That is, it is possible to easily select the shape of the back anchoring portion, and therefore, only the back stitch is omitted by omitting the back anchoring portion including the front stitch and the rear stitch, or the front stitch. It is possible to easily and surely form a back stopper portion made of
[0056]
[Brief description of the drawings]
FIG. 1 is a perspective view of a drilling machine according to an embodiment of the present invention.
FIG. 2 is a right side view of the front part of the sewing machine main body of the boring machine.
FIG. 3 is a perspective view of a cloth feed mechanism.
FIG. 4 is a perspective view of a front portion of a sewing machine body including a thread tension mechanism of a boring machine.
FIG. 5 is a plan view of a hole stitch.
FIG. 6 is a plan view of the front stitch of the back stitching preventing portion of the hole stitch.
FIG. 7 is a plan view of a back-stage stitch of a back-end preventing portion of a hole stitch.
FIG. 8 is a plan view of a front stage stitch of a back anchoring part of a hole stitch.
FIG. 9 is a plan view of the front stitch of the back stitching prevention portion of the hole stitch.
FIG. 10 is a plan view of an anterior stitch of a back anchorage portion of a hole stitch.
FIG. 11 is a plan view of a front stage seam of a back seam stop portion of a hole seam.
FIG. 12 is a plan view of a front-stage stitch of a back anchoring portion of a hole stitch.
FIG. 13 is a plan view of a back-stage stitch of a back-end preventing portion of a hole stitch.
FIG. 14 is a block diagram of a control system for a boring machine.
FIG. 15 is a chart (1/4) representing a plurality of parameters.
FIG. 16 is a chart (2/4) representing a plurality of parameters.
FIG. 17 is a chart (3/4) representing a plurality of parameters.
FIG. 18 is a chart (4/4) representing a plurality of parameters.
FIG. 19 is a flowchart of control executed by the control device.
[Explanation of symbols]
M drilling machine
4 Operation panel
5 Control device
10 Cloth feed mechanism
30 Sewing mechanism
64 Backstop
70-75 Front stitch
76 Back stitch

Claims (2)

A cloth feed means for feeding the work cloth, a sewing means for forming stitches on the work cloth, and a hole sewing that includes a pair of staggered portions and a pair of tack-fastening portions by controlling the cloth feed means and the sewing means. In a perforated sewing machine equipped with a control means for forming eyes,
The control means sews a zigzag front stage seam in which the amplitude direction is the cloth feed direction when forming the back tack stop portion of the pair of tack stop portions, and then the amplitude direction is orthogonal to the cloth feed direction. A boring machine characterized in that the cloth feeding means and the sewing means are controlled so as to continuously sew back-stage stitches composed of ordinary tack-stopped seams. In the control means, a first mode for forming a back tacking portion comprising the front stitch and the back stitch, and a second mode for forming a back tacking portion comprising only the back stitch without the front stitch. 2. The boring machine according to claim 1, further comprising mode setting means for alternatively setting the mode.