JPH10328454A - Sewing machine for overcasting grommet hole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily set the numbers of stitches or a seam pitch for making excellent seams by obtaining the number of stiches or the seam pitch for overcasting a grommet part in accordance with a setting seam characteristic when the length of a grommet hole, the seam pitch of a leg part and data of a knife shape for making the grommet hole are inputted. SOLUTION: When seam data is generated, a select key 23d, a numerical value up key 23e and a numerical value down key 23f are previously operated from an operation panel 23 so that desired numerical values are inputted concerning the length L of the grommet hole, the seam pitch p and a lower knife shape. A timing for making the grommet hole by a knife execution timing setting switch 23i and the correction of the number of stitches by a needle number increase/decrease switch 23j are set and the respective set numerical values are stored in RAM by the operation of an establishment key 23g. Then, the length of the grommet hole is calculated in accordance with the setting seam characteristic which is previously set based on input data, the sewing length of the leg part is calculated based on a grommet upper part dimension and a grommet lower part dimension and also the number of stitches for overcasting the leg part is calculated so as to be outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eyelet overlocking sewing machine, and more particularly to an eyelet hole length, a foot seam pitch, and a female shape simply by inputting and setting, so as to balance the seam density of the foot. The present invention relates to an apparatus for automatically determining the standard number of stitches of an eyelet portion capable of overcasting the eyelet portion.

[0002]

2. Description of the Related Art Conventionally, as described in Japanese Patent Application Laid-Open Nos. 4-26436 and 4-26169, an eyehole formed by an eyelet and a continuous linear foot is sewn. In an eyelet overlocking machine, a drive mechanism that drives the needle bar and a looper facing the needle bar in synchronization with each other, and a rotation mechanism that rotates the looper base and the needle bar provided with the looper counterclockwise in plan view. A moving mechanism is provided, and a feed mechanism for moving a feed table on which the work cloth is placed in the X direction and the Y direction, respectively, is provided. By controlling the drive of the mechanism and the rotation mechanism, first, the right side of the linear foot is overlocked, then the second eyelet is overlocked, and finally, the left side of the linear foot is overlocked. , Eyelet on the work cloth Eye is formed.

[0003] In the above-mentioned publication, an operation panel is usually provided in the eyelet buttonhole sewing machine, and the operation panel is operated to generate stitch data for the eyehole buttonhole sewing operation. In addition to "Length", "Pitch of seam of foot", "Number of eyelets for overlock sewing of eyelet", and "Scalpel which specifies the shape (type) of scalpel used for eyelet hole formation Numerical values are input and set in advance for each setting item such as “shape”. That is, from the operation panel, it is possible to perform desired eyelet buttonhole sewing in accordance with the size and use of the eyelet holehole sewing and the size of the eyelet hole and the seam density. In addition to being able to input and set numerical values, the set numerical values can be easily changed, and stitch data is created based on the finally set numerical values.

[0004]

As described above, in the eyelet buttonhole sewing machine described in Japanese Patent Application Laid-Open Nos. 4-26436 and 4-26169, etc. When entering and setting numerical values for items such as "eyelet hole length", "foot seam pitch", and "eyelet stitch count", the "eyelet hole length" and "scalpel shape" ) Can be easily set with a numerical value according to the application, and `` seam pitch of the foot '' can be easily set because the foot is substantially straight, but for `` number of eyelet needles '', Since the eyelet portion is substantially arc-shaped, it may be difficult to set a good-looking stitch number in accordance with the size of the scalpel so as to balance the stitch density of the linear foot portion. In this case, the setting of the “number of eyelets of the eyelet” and the trial sewing are repeated, and there is a problem that the work efficiency of the eyelet buttonhole sewing decreases.

SUMMARY OF THE INVENTION An object of the present invention is to form eyelet stitches with good appearance that balance with the seam densities of the feet simply by inputting and setting the eyelet hole length, the stitch pitch of the feet and the female shape data. The purpose of the present invention is to provide an eyelet overlock sewing machine that can easily determine the number of stitches and the stitch pitch for sewing.

[0006]

According to a first aspect of the present invention, there is provided an eyelet buttonhole sewing machine for sewing an eyelet keyhole including an eyelet and a foot on a work cloth set on a feed base. A driving mechanism for simultaneously driving the needle bar and the looper so as to repeat a stitch forming operation for forming a stitch on the work cloth by the cooperation of the above. A feed mechanism for independently feeding and moving in the X direction perpendicular to the direction, a rotation mechanism for rotating a looper base provided with a looper and a needle bar, a feed amount of the feed base for each needle, a needle bar and a looper At least an eyelet hole length and a seam pitch of a foot portion of an eyelet buttonhole sewing machine including a control device that controls a driving mechanism, a feed mechanism, and a rotation mechanism based on seam data specifying a rotation angle of a base. And scalpel-shaped scalpel Input means for input setting, and determining means for calculating the number of stitches or stitch pitch for overcasting the eyelet by applying the data input from the input means to a preset set stitch characteristic, Data generating means for generating overlock stitch data based on the eyelet hole length, the stitch pitch of the foot, and the data of the number of stitches or the stitch pitch of the eyelet obtained by the determining means. It is assumed that. Here, the data of the scalpel shape input and set by the input means may include data using a scalpel before or after overlock stitching.

[0007] When at least the eyelet hole length, the stitch pitch of the foot portion, and the female shape data of the eyelet forming knife are input and set by the input means, the determining means preliminarily stores the data input from the input means. Since the number of stitches or the stitch pitch for overcasting the eyelet portion is determined by applying the set stitch characteristics, the data creation means is determined by the eyelet hole length, the stitch pitch of the foot portion, and the determination means. Based on the data of the number of stitches or the stitch pitch of the eyelet portion, stitch data of the overlock stitch is created.

According to a second aspect of the present invention, in the first aspect, the set stitch characteristic is a stitch number table in which the number of stitches of the eyelet portion is preset using a stitch pitch and a scalpel shape as parameters. It is characterized by consisting of. In this case, since the set stitch characteristic is constituted by a stitch number table, the number of stitches of the eyelet portion can be easily obtained from the stitch number table using the stitch pitch and the female shape as parameters. In addition, the same operation as the first aspect is achieved.

In a third aspect of the present invention, the input means comprises a stitch number increasing / decreasing switch for increasing / decreasing the number of stitches of the eyelet in the eyelet portion, and the data creating means comprises: The stitch data is created based on the number of stitches increased / decreased by the number increase / decrease switch and the number of stitches obtained by the determination means. In this case, by operating the needle number increase / decrease switch, it is possible to instruct to increase or decrease the number of stitches of the eyelet in the eyelet portion, and the data creating means is instructed by the standard number of stitches obtained by the determining means. Correction is performed by increasing or decreasing the number of stitches, and stitch data is created based on the corrected number of stitches. In addition, the same operation as the first or second aspect is achieved.

According to a fourth aspect of the present invention, in the invention of the first aspect, the set stitch characteristic is such that the stitch pitch of the eyelet portion is set in advance using the stitch pitch and the female shape as parameters. It is characterized by comprising a pitch table. In this case, since the set stitch characteristic is constituted by the stitch pitch table, the stitch pitch of the eyelet portion is easily obtained from the stitch pitch table using the stitch pitch of the foot portion and the female shape as parameters. be able to. In addition, the same operation as the first aspect is achieved.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. The present embodiment is a case where the present invention is applied to an eyelet overlock sewing machine which overlocks around an eyelet formed on a work cloth. As shown in FIG. 1, the eyelet overhole sewing machine M is configured by integrally having a bed part 1 having a substantially rectangular box shape and an arm part 2 extending continuously forward from an upper part of a rear part thereof. It is placed on a table 16. The sewing machine table 16 has a mince motor 24 (FIG. 3) serving as a drive source of a drive mechanism for synchronously driving the needle bar 4 and the looper 6a (see FIG. 2).
), An operation panel 23 for inputting and setting various numerical values such as a stitch pitch and the like, a foot-operated start / stop switch 20 and the like, and a microcomputer for controlling the operation of each mechanism. Is provided.

A sewing needle 3 is provided at a lower portion of the tip of the arm 2.
Although not shown in detail, the rotating force of the main shaft 5 rotated by the drive of the mince motor 24 is transmitted by a cam mechanism, and the needle bar 4 swings right and left by a predetermined width. While being driven up and down. In this case, one rotation of the main shaft 5 causes the needle bar 4 to move up and down twice between a left swing position and a right swing position. Further, the bed unit 1 has a looper base having two loopers 6a opposed to the needle bar 4 and operated in synchronization with the needle bar 4 transmitted by the cam mechanism by the rotational force of the main shaft 5. The rotation of the main shaft 5 is also transmitted to a looper 6 a via a cam mechanism (not shown), and the looper 6 a is driven in synchronization with the vertical movement of the needle bar 4. Here, the drive mechanism includes the mince motor 24, the main shaft 5, the cam mechanism, and the like.

The needle bar 4 and the looper base 6 are rotated about a vertical axis in a horizontal plane by a .theta. Drive motor 26 comprising a stepping motor and a rotating mechanism 8 comprising a gear mechanism 7 provided in the bed 1. So that it can rotate integrally. The bed 1 is provided with a lower knife 9 which is fixed and arranged on the rear side of the looper base 6, and a punching hammer 10 which comes into contact with and separates from the lower knife 9 from above is swingable. Is provided. The hammer 10 is driven by a hammer driving mechanism 12 including an air cylinder 11 (see FIG. 3) provided in the bed portion 1 and cooperates with the lower knife 9 as shown in FIG. The eyelet hole DH is formed in the work cloth.

A feed stand 13 on which a work cloth is set is provided on the upper surface of the bed 1. The feed base 13 has a thin rectangular box shape as a whole, and a portion corresponding to the looper base 6 and the lower knife 9 on its lower surface is open. As shown in FIG. 2, a metal cross plate 14 having an opening 14a is provided on the upper surface of the feed table 13. And this feeder 1
Although not shown in detail, a feed mechanism 15 (see FIG. 3) including an X-direction drive motor 30 and a Y-direction drive motor 32 provided in the bed 1 is parallel to the eyelet F of the eyelet. Horizontal movement is possible independently in the Y direction (front-back direction) and the X direction (left-right direction) orthogonal to the Y direction. A cloth holder (not shown) for holding a work cloth is provided on the cross plate 14 at both left and right sides of the opening 14a.

Next, an outline of a control system of the eyelet buttonhole sewing machine M will be described with reference to a block diagram of FIG. The control device 35 of the sewing machine M includes a microcomputer including a CPU 36, a ROM 37 and a RAM 38, and an input interface 40 and an output interface 41 connected to the microcomputer via a bus 39 such as a data bus. 4
0, a start / stop switch 20, a presser foot switch 21 connected to the presser foot, and a timing signal generator 22.
Then, a signal from the operation panel 23 is supplied.

From the output interface 41, a drive circuit 25 for the sewing machine motor 24, a drive circuit 27 for the θ-direction drive motor 26, and electromagnetic switching for driving the air cylinder 11 provided in the hammer drive mechanism 12. Valve 2
8, a drive circuit 31 for the X-direction drive motor 30 and a drive circuit 33 for the Y-direction drive motor 32 of the feed mechanism 15, and a drive signal and drive for each of the operation panels 23. A pulse signal is provided. Here, the X-direction drive motor 30 and the Y-direction drive motor 32 are each constituted by a stepping motor. The timing signal generator 22 is provided in association with the main shaft 5 of the sewing machine M, detects the rotational phase of the main shaft 5, and outputs a phase signal.

In the ROM 37, based on the stitch data,
In addition to the drive mechanism that drives the looper 6a and the needle bar 4,
A drive control program for driving the hammer drive mechanism 12, the feed mechanism 15, and the rotation mechanism 8, a control program for stitch data creation control unique to the present application described later, and the like are stored.
The RAM 38 is provided with various work memories and buffers in addition to a memory for storing the created stitch data.

Next, on the operation panel 23 (corresponding to the input means), as shown in FIG.
That is, as shown in FIG. 9, the setting is made up of the size L of the eyelet hole DH, the “stitch pitch” p of the foot F, and the “lower knife shape” specifying the shape of the lower knife 9 forming the eyelet hole DH. Item names relating to the items are described, display lamps 23a to 23c corresponding to each item, select keys 23d for sequentially switching these three setting items and inputting numerical values, and changing numerical values to be input to each setting item Numeric up key 23e for
And a numerical value down key 23f and a confirm key 23g for confirming the numerical value setting.

Further, a numerical key 23 is provided on the operation panel 23.
In addition to the LED display 23h for displaying numerical values set each time the e and 23f are operated, the lower knife 9 performs eyelet formation prior to the overlock sewing.
And a slide-type knife execution time setting switch 23i for selectively selecting "no knife" in which an eyelet is not formed and "post knife" in which the eyelet is formed after overlocking, and the obtained eyelet D And a slide type needle number increase / decrease switch 23j for selectively selecting whether to use the standard number of stitches or to correct the standard number of stitches by "+1" or "-1".

As shown in FIG. 5, the stitch pitch (0.9 mm, 1.0 mm, 1.1 mm,...) Of the foot F and the shape of the lower knife 9 are designated in the table memory 37a of the ROM 37. The eyelet which balances the seam density of the linear foot F by using the female shape numbers (0, 1, 2,...) To be formed and the timing of eyelet hole formation (first scalpel, no scalpel, rear scalpel) as parameters. A stitch number table NT in which the standard stitch number of the section D is set in advance (this corresponds to a set stitch characteristic) is stored. Here, the eyelet buttonhole sewing will be briefly described with reference to FIG.
As shown in FIG. 1, a substantially linear foot portion F and a substantially circular eyelet portion D continuous with the foot portion F are overlock-stitched at a predetermined stitch pitch.

A plurality of types of lower knives 9 having different eyelet portions D and different lengths of the foot portions F are prepared, and the lower knives 9 are provided with female shape numbers (0, 1,.
2 ...) are assigned. By defining the needle drop position of each outer needle among the overlock stitches, the needle drop position and the stitch width of the inner needle are defined by the rotating mechanism 8. The eyelet upper dimension C, eyelet lower dimension B, and foot linear dimension A with respect to the eyelet hole DH size L are stored in advance in the ROM 37 for each type of lower knife. Similarly, the curve data corresponding to the lower dimension B is previously stored in the ROM 3 for each type of lower knife.
7 is stored.

Next, the control device 3 for the eyelet hole holing machine M
5 will be described with reference to the flowcharts of FIGS. 6 to 8. However, the symbol Si (i = 10, 11, 12,...)
・) Is each step. Here, prior to creating the stitch data, select key 2
3d, numeric up key 23e and numeric down key 23f
Is operated to input and set desired values for the items “Length of eyelet” L, “Pitch of seam” p, and “Shape of lower knife”, respectively. The timing of the formation and the correction of the number of stitches by the stitch number increase / decrease switch 23j are set, and the set numerical value of each item is stored in the work memory of the RAM 38 by operating the enter key 23g.

When the enter key 23g is operated (S10: Yes), this control is started.
The setting data for each setting item stored in the work memory is read (S11). Next, control for creating stitch data for the foot F (see FIG. 7) is executed (S12). When this control is started, first, the sewing length (A + B) of the foot F is calculated based on the eyelet hole length L previously stored in the ROM 37 and the eyelet upper dimension C and the eyelet lower dimension B. Is determined (S20).

Next, the number of stitches for overcasting the foot F is calculated (S21). That is, this stitch number calculation is obtained by dividing the stitch length (A + B) of the foot F by the set stitch pitch p. Next, the stitch data of the foot F is obtained by calculation (S22), and the process returns to S13 of stitch data creation control. That is, in the stitch data calculation, the stitch data for the number of stitches is obtained based on the stitch start position data, the stitch length data, the stitch pitch p, and the curve data corresponding to the eyelet lower dimension B. Is created.

Then, in the stitch data creation control, the stitch data creation processing control (see FIG. 8) of the eyelet portion is executed (S13). When this control is started, first, the ROM 37
Number table NT stored in table memory 37a
Then, the standard number of stitches having the set stitch pitch p, lower knife shape number, and data on the timing of eyelet hole formation as parameters are read (S30). Here, S30 corresponds to a determination unit. Next, when the number of stitches other than the "standard number of stitches" is instructed (+1 or -1) by the stitch number increase / decrease switch 23j (S31: Yes), the increase / decrease value of the number of stitches is added to the standard number of stitches. Then, the correction of the number of stitches of the eyelet D is calculated (S32).

Next, the stitch data of the eyelet D is calculated (S33), and the process returns to S14 of the stitch data creation control. That is, in this stitch data calculation, based on the number of stitches of the eyelet D and the curve data of the eyelet upper dimension C and the eyelet D stored in the ROM 37 in advance, each needle drop on the curve of the eyelet D The position data of the position is obtained, and for each needle drop position, the needle bar 4 and the looper base 6 are rotated by the rotating mechanism 8.
, And the amount of movement of the feed base 13 in the X direction and the Y direction. Then, in the stitch data generation control, the stitch data of the eye portion D obtained in S12 and the stitch data of the eyelet portion D obtained in S13 are synthesized to generate the stitch data of the eyelet hole buttoning. Is performed (S14). Here, S12 to S14 correspond to data creation means.

As described above, the seam density of the linear foot portion F is set using the seam pitch p of the foot portion F, the female shape number of the eyelet hole forming lower knife 9 and the timing of eyelet hole formation as parameters. Is provided in the table memory 37a in which the standard number of stitches of the eyelet portion D is set in advance in the table memory 37a, and the operation panel 23 is operated to set the setting items "length of eyelet hole",
The standard number of stitches for overcasting the eyelet D is easily determined based on the setting data set for the “stitch pitch” and “lower knife shape” and the setting data by the knife execution timing setting switch 23i. By using the set numerical value and the number of stitches, it is possible to sew a nice-looking eyelet buttonhole stitching and to improve the work efficiency.

Further, since the operation panel 23 is provided with a stitch number increasing / decreasing switch 23j for increasing / decreasing the number of stitches for the eyelet D, the standard number of stitches is determined by the number of stitches increased / decreased by the stitch number increasing / decreasing switch 23j. Can be corrected, and stitch data can be created based on the corrected number of stitches.

Here, as a modification of the above embodiment,
Instead of the stitch number table NT, the stitch pitch p of the foot F
The standard stitch pitch of the eyelet portion D, which balances the seam density of the foot portion F, is set in advance using, as parameters, a number designating the female shape of the eyelet hole forming lower knife 9 and the eyelet hole forming time. A stitch pitch table may be provided. In this case, by setting a substantially middle position between the outer needle and the inner needle of each stitch as the stitch pitch, the same operation and effect as in the above embodiment can be obtained. Further, the stitch number table N
Instead of T, the standard number of stitches and stitch pitch for the eyelet D may be obtained by calculation using the data of the stitch pitch p and the female shape number as parameters. Further, regarding the above-described embodiment, various changes may be made based on existing technology or technology obvious to those skilled in the art. Further, it is needless to say that the present invention can be applied to various eyelet hole stitching machines.

[0030]

According to the first aspect of the present invention, a drive mechanism for simultaneously driving the needle bar and the looper, a feed mechanism for feeding and moving the feed table, and a rotating mechanism for rotating the looper base and the needle bar are provided. In an eyelet buttonhole stitcher provided with a control device that controls a drive mechanism, a feed mechanism, and a rotation mechanism, at least the eyelet hole length, the stitch pitch of the foot, and the female shape data of the eyelet forming scalpel are used. Input means for input setting;
Determining means for applying the data input from the input means to a preset set seam characteristic to determine the number of stitches or stitch pitch for overcasting the eyelet, and the length of the eyelet hole and the seam of the foot Data creation means for creating stitch data for the overlock stitch based on the pitch and the number of stitches of the eyelet or the stitch pitch data obtained by the determination means. The number of stitches or the stitch pitch of the substantially arcuate eyelet portion to be formed can be easily determined, and the eyelet buttonhole stitching with good appearance can be sewn, and the working efficiency can be improved.

According to the second aspect of the present invention, the set stitch characteristics are constituted by a stitch number table in which the number of stitches of the eyelet portion is set in advance using the stitch pitch and the scalpel shape as parameters. The number of stitches at the eyelet can be easily obtained based on the pitch and the scalpel shape. The other effects are the same as those of the first aspect. According to the third aspect of the present invention, the input means includes a stitch number increasing / decreasing switch for increasing / decreasing the number of stitches of the eyelet of the eyelet portion, and the data creating means determines the number of stitches increased / decreased by the stitch number increasing / decreasing switch. It is configured to create stitch data based on the number of stitches obtained in step 2, so it can be corrected by operating the stitch number increase / decrease switch to increase or decrease the standard number of stitches. Stitch data can be created based on the stitch data. In addition, the same effect as the first or second aspect is obtained.

According to the fourth aspect of the present invention, the set stitch characteristics are input and set because the stitch pitch of the eyelet portion is set in advance using the stitch pitch and the female shape as parameters. The stitch pitch of the eyelet can be easily obtained based on the stitch pitch of the foot and the female shape. The other effects are the same as those of the first aspect.

[Brief description of the drawings]

FIG. 1 is a side view of an eyelet buttonhole sewing machine according to an embodiment of the present invention.

FIG. 2 is a partial plan view of a feed base of the eyelet buttonhole sewing machine.

FIG. 3 is a block diagram of a control system of the eyelet buttonhole sewing machine.

FIG. 4 is a plan view of an operation panel.

FIG. 5 is a diagram illustrating a data configuration of a stitch number table.

FIG. 6 is a schematic flowchart of a stitch data creation control routine.

FIG. 7 is a schematic flowchart of a routine of control processing for creating stitch data of a foot;

FIG. 8 is a schematic flowchart of a routine for controlling stitch data creation processing of an eyelet portion;

FIG. 9 is an explanatory diagram illustrating stitch data of eyelet buttonhole stitching.

[Explanation of symbols]

 M Eyelet overlocking sewing machine 3 Sewing needle 4 Needle bar 6 Looper base 8 Rotating mechanism 9 Lower knife 6a Looper 13 Feeder 15 Feeding mechanism 23 Operation panel 23j Needle number increase / decrease switch 35 Controller 36 CPU 37 ROM 38 RAM

Claims (4)

[Claims] 1. A stitch forming step for forming a stitch on a work cloth in cooperation with a sewing needle and a looper in order to sew an eyelet hole including an eyelet and a foot on a work cloth set on a feed base. A drive mechanism for simultaneously driving the needle bar and the looper so as to repeat the operation, and a feed for independently moving the feed bar in the Y direction parallel to the foot and the X direction perpendicular to the Y direction when the needle bar is raised. A mechanism, a looper base provided with a looper and a rotation mechanism for rotating the needle bar, and a stitch data specifying a feed amount of the feed bar for each stitch and a rotation angle of the needle bar and the looper base. In an eyelet hole buttonhole sewing machine equipped with a control device that controls a drive mechanism, a feed mechanism, and a rotation mechanism, at least input and set data of the eyelet hole length, the stitch pitch of the foot, and the female shape of the eyelet forming knife. Input means for performing Determining means for determining the number of stitches or the stitch pitch for overcasting the eyelet by applying the input data to a preset set stitch characteristic; and the length of the eyelet hole and the stitch pitch of the foot. A data forming means for generating stitch data of an overlock stitch based on data of the number of stitches or a stitch pitch of the eyelet portion obtained by the deciding means. 2. The eyelet hole according to claim 1, wherein the set stitch characteristic comprises a stitch number table in which the number of stitches of the eyelet portion is preset using the stitch pitch and the female shape as parameters. Overlock sewing machine. 3. The input means includes a stitch number increasing / decreasing switch for increasing / decreasing the number of stitches of the eyelet portion, and the data creating means determines the number of stitches increased / decreased by the stitch number increasing / decreasing switch and determining means. The eyelet buttonhole sewing machine according to claim 1 or 2, wherein the stitch data is created based on the number of stitches. 4. The stitch pitch table according to claim 1, wherein the set stitch characteristic is a stitch pitch table in which the stitch pitch of the eyelet portion is set in advance using the stitch pitch and the female shape as parameters. Eyelet sewing machine.