JP2001170377A - Buttonhole sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve work efficiency and maintain the quality of a sewn product by correcting a position on the basis of a set position in the case of a worker desiring to correct the position after setting the position of the inner end part of a side stitch part on the basis of the center of a buttonhole. SOLUTION: This buttonhole sewing machine forming buttonhole sewing seams with both side stitch parts formed on both sides of a buttonhole, and a bar tacking stitch part formed at least at one end of both side stitch parts, by an electrically drive-controlled driving means, is provided with a means for setting the positions of the inner end parts of both side stitch parts on the basis of the center of a buttonhole, and a means for setting the corrected positions of the inner end parts on the basis of the set positions of the inner end parts of both side stitch parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buttonhole overlock sewing machine, and more particularly to a buttonhole overlock sewing machine that forms a buttonhole overlock stitch around a buttonhole by drive means that is electrically driven and controlled.

[0002]

2. Description of the Related Art As a buttonhole overlock sewing machine for forming a buttonhole overlock stitch by an electric driving means as described above, for example, Japanese Patent Laid-Open Publication No.
What is described in 1-128578 is known. In these sewing machines, a so-called stitch is formed, which is formed by a double-sided stitch portion formed on both sides of the button hole and a bar-tacking portion formed continuously at both ends of the double-sided stitch portion. Is done. The cloth cutting knife is dropped on the workpiece corresponding to the space between the sewn portions before, after, or during the sewing.

Also, as described in Japanese Patent Application Laid-Open No. 9-135980, a so-called eyelet buttonhole stitch is formed by driving an electric driving means, and a bar-tacking portion is formed at the end thereof. A buttonhole stitching sewing machine is known.

In the above-mentioned conventional buttonhole overlock sewing machine, as shown in FIG. 12, the positions of the inner edges Sa and Sb of the both-side stitching portions A1 and A2 are determined based on the center line C of the buttonhole. The width w of the both-side stitching portion and the height h of the bar-tacking portions B1 and B2 are set.
Or the position and length of the buttonhole by the cloth cutting knife are input and set, and the driving means is driven by the sewing data based on the set value to form a predetermined buttonhole stitch and a buttonhole is formed. It is formed at a predetermined time.

[0005]

In the above-mentioned conventional buttonhole overlock sewing machine, when setting the data of the both-side sewing portions A1 and A2, the operator inputs desired numerical values and sets them. When the seam is formed, the thread tension,
In some cases, the setting may be different from that set due to the flexibility of the dough. In this case, the operator has to input and set the numerical values again as in the previous case, so that the setting operation is troublesome. In addition, as shown in FIG.
The inner ends Sa and Sb of the first and the second A2 are positioned in parallel along the button hole.

However, when the bar-tacking stitch portions B1 and B2 are formed, the fabric is pulled inward due to the thread tension, so that both end portions (upper and lower ends) of the both-side stitching portions A1 and A2 are positioned with respect to the center. As shown in FIG. 13A, the inner edges Sa and Sb of the both-side stitches may be formed in an arc shape as drawn inward. For this reason, cloth cutting knife M
When the buttonhole is formed, the sewing thread may be cut by the cloth cutting knife M or the seam thread may be damaged on the side of the cloth cutting knife M, and the commercial value of the sewn product may be lost.

In order to prevent this, both side stitching portions A1, A2
13B, the inner edges Sa, S of the both-side stitched portions A1, A2 are set as shown in FIG.
b are too far apart from each other, the space between the button hole incision position by the cloth cutting knife M and the center of the inner edges Sa, Sb is enlarged, and the cloth is moved inward from the inner edges Sa, Sb. It jumped out and made the appearance worse, resulting in a disadvantage that the quality of the sewn product was significantly reduced.

[0008]

According to a first aspect of the present invention, a double-sided stitch portion and a double-sided stitch formed on both sides of a button hole by drive means electrically driven and controlled. Means for setting a position of an inner end of the both-side stitching portion in a buttonhole overlocking sewing machine forming a buttonhole overlocking stitch by a bar-lock stitching portion formed at at least one end of the portion; Means for setting the correction position of the inner end portion with reference to the position of the inner end portion of the portion, so that the position of the inner end portion of the both-side stitching portion can be corrected and set.

According to a second aspect of the present invention, in the buttonhole holing machine according to the first aspect, the means for setting the position of the inner end portion or the correction position inputs and sets a set value by a distance.

According to a third aspect of the present invention, in the buttonhole holing machine according to the first aspect, the means for setting the position of the inner end portion or the correction position inputs and sets a set value by the position.

According to the first, second, and third aspects of the present invention, when the operator sets the position of the inner end of the side stitch portion with reference to the center of the button hole and wants to correct the position, the set position is set. Is modified based on
Since the operator only needs to input and set a correction value that has a real feeling, the work efficiency can be improved and the quality of the sewn product can be maintained.

The invention described in claim 4 is the first invention.
In the buttonhole overlocking machine described above, the means for setting the correction position can set the correction position only in a predetermined length range from the bar-tacking sewing portion in the both-side sewing portion. Thus, even if the ends of both side stitches are pulled inward by the bar-tacking portion, the correction setting can be made so that only the ends are opened outward, so that the quality of the sewn product does not deteriorate.

[0013] The invention described in claim 5 is the first invention.
In the buttonhole overlocking machine described in the above, the position of the outer end of the buttonhole overlocking sewing is simultaneously corrected at the time of setting the correction position.

[0014] Further, the invention according to claim 6 is based on claim 1.
Wherein the position of the outer end portion of the buttonhole overlock sewing is not changed when the correction position is set. According to the invention of claims 5 and 6,
It is possible to form a double-sided seam-shaped stitch depending on the portion of the clothing forming the buttonhole stitch and the purpose.

[0015]

Embodiments of the present invention will be described below.

The buttonhole buttonhole sewing machine shown in FIGS. 1 to 3 is described in detail in Japanese Patent Application Laid-Open No. H11-9859, so only the basic configuration will be described.

Sewing machine motor M supported by sewing machine frame 1
1 is directly connected to the main shaft 2 of the sewing machine and is rotated. The needle bar 4 supported by the needle bar swing table 3 so as to be vertically movable is vertically moved in conjunction with the main shaft 2.

The needle bar rocking mechanism 5 has a rocking cam 6 which rotates in conjunction with the main shaft 2. The rotation of the rocking cam 6 causes the needle bar rocking table 3 to cross the cloth feeding direction. Then, it swings (needle swing) from a predetermined baseline at a predetermined swing width. The baseline setting mechanism 7
The needle bar swing mechanism 5 acts on the needle bar swing mechanism 5 so as to form a swing baseline corresponding to the rotation angle of the base motor (pulse motor) M2, and the swing width setting mechanism 8 responds to the rotation angle of the needle swing motor (pulse motor) M3. Act on the needle bar swing mechanism 5 so that the swing width from the swing base line is obtained.

In FIG. 2, a presser arm 10 supporting a cloth presser member 9 at its tip and a cloth holding plate 11 for holding a sewing object between the cloth presser member 9 are driven by a feed motor (pulse motor) M4. Thereby, it is possible to reciprocate integrally along the cloth feeding direction.

In FIG. 3, a knife arm 13 having a cloth cutting knife 12 fixed to the lower end is supported by the machine frame 1 so as to be able to move up and down by driving an air cylinder 14.
As a result, a button hole is opened in the workpiece supported by the cloth holding plate 11 and the cloth pressing member 9.

An operation panel 15 is disposed on the sewing machine frame 1 or a sewing machine table (not shown). The operation panel 15 has a two-digit LED 7 as shown in FIG.
Numerical display 15A by segment and 4-digit LED
Numerical value display unit 15B and numerical value display unit 15 using 7 segments
Minus key 15C to increase or decrease the numerical value of each digit of A and B
And the plus key 15D, a setting mode for input setting, that is, a pattern No. Alternatively, a selection key 15E for selecting a setting item or the like is provided so that a numerical value of the setting item shown in FIG. 5 can be input and set.

Each of the setting items al corresponds to each part of the buttonhole stitch shown in FIG. Also, the sewing key 15F
Generates an ON signal when operated to confirm the sewing preparation completion. The switching key 15G is used to switch between the correction of the entire inner end and the correction of only the upper and lower ends when the inner end of the side sewing portion described later is corrected.
5H is for switching the presence or absence of the outer end correction.

Next, the control block configuration and control flow of the buttonhole overlock sewing machine according to the present embodiment will be described with reference to FIG.
This will be described with reference to FIG. The details of the control block diagram and the control flow of this buttonhole overlock sewing machine are described in the above-mentioned Japanese Patent Application Laid-Open No. 11-9859, and this embodiment will explain the contents related to the present invention.

As shown in the figure, a CPU 101 has a ROM 101, a RAM 102, various counters 1 via a bus.
03, an interrupt controller 104 and an I / O interface 105 are connected.

The CPU 100 includes various control units and calculation units, that is, a sewing machine control unit, a sewing machine drive speed determination unit, a baseline and needle swing width change amount correction unit, a stitch formation order designation unit,
Sewing data readout section, sewing start designation section, knife control section,
Includes knife vertical movement timing determination unit including knife lowering timing determination unit, vertical movement timing interval determination unit, side stitching length change unit, needle drop control unit, pattern enlargement / reduction reference point determination unit, various drive control units, etc. Have been.

The ROM 101 stores a control program and defaults, for example, a storage unit for storing a sewing mode.

The RAM 102 stores various variables for control, such as sewing data, baseline / needle swing data, and the like.

Various counters 103 are written with respective count values for detecting data timing of needle swing and cloth feed or detecting operation timings of cloth cutting knife, thread trimming, and the like. After a time proportional to the value has elapsed, the counter output is repeated at a constant cycle until a one-pulse count signal is output and a counter stop command is written.

The interrupt controller 104 is for the CPU 100 to automatically execute an interrupt process corresponding to each interrupt signal in response to each interrupt signal input.

The I / O interface 105 is a CPU
Reference numeral 100 designates an interface with an external input / output device.

Each count output of each counter 103 is connected to an interrupt controller 104, and an interrupt process corresponding to each counter is executed by the count output of each counter.

The presser switch 106 generates a signal for raising or lowering the presser foot 9 when it is turned on by an operator operating a pedal (not shown) of the sewing machine. The start switch 107 generates a signal for starting sewing when turned on by operating the pedal.

Next, the control will be described based on the general flow shown in FIG.

As shown in the general flow, first, when the power is turned on, the operation panel setting process is called in step S1, and various setting processes are performed by the operation panel 15. When the sewing key 15F is turned on (step S2),
In the next step S3, the sewing data creation process is called,
Sewing data is created. If the sewing key 15F is not turned on in step S2, the process returns to step S1.

After the sewing data is created, the next step S4
Then, an output for lowering the presser foot 9 (presser lowering output) is performed. Subsequently, in the next step S5, a machine origin search process is called, and a machine origin search of the feed motor M4 / base line motor M2 / needle swing motor M3 is performed. I do. Subsequently, in the next step S6, the sewing start movement is called, and the feed motor M4 / base line motor M2 / needle swing motor M3 is driven to the sewing start position. In the next step S7, the output for raising the work clamp foot 9 is output. (Presser lift output), and then proceed to the next step S8.

In step S8, the sewing key 15F is checked. When the sewing key 15F is turned on, the process returns to step S1, and the operation panel setting process is performed again. Next step S
Go to 9. In step S9, the presser switch 106 is checked. If the presser switch 106 is on, the process proceeds to the next step S10. If the presser switch 106 is not on, the process returns to step S8.

In step S10, it is determined whether or not the presser foot 9 is being raised. If the presser foot 9 is being raised, a presser foot lowering output is performed in the next step S11. In step S12, the presser lift output is performed, and the process returns to step S8.

After the presser foot lowering output, the next step S13
Then, the work clamp switch 106 is checked. When the work clamp switch 106 is turned on, the work clamp lifting output is performed in step S12, and the process returns to step S8. If the work clamp switch 106 is not turned on, the next step is performed. Proceed to S14. In step S14, the start switch 107 is checked, and when the start switch 107 is turned on,
Proceed to the next step S15, and start switch 1
If 07 is not on, the process returns to step S13.

Then, in step S15, the sewing process is called and sewing is started. After the sewing is completed, the presser foot lifting output is performed in the next step S16.
Return to 8.

The processing methods such as the sewing data creation processing S3 and the sewing processing S15 are described in JP-A-11-985.
This method is performed by a conventionally well-known method described in Japanese Patent Application Publication No. 9-No.

In the operation panel setting process S1, as shown in FIG. 9, when the selection number by the selection key 15E is 0 (step S101), the stored pattern is changed (step S102). If the number is 1 (step S103), it is determined whether the switching key 15H is the full length correction mode or the upper and lower end correction mode (step S104). If the switch key 15H is set to the upper and lower end correction mode, the setting values m5 and m6 are set. Is prohibited (step S1
05), the changeover key 15G is forcibly set to no correction of the outer edge (step S106), and then setting of each setting item can be performed (step S107).

On the other hand, when the full length correction mode is set by the switching key 15H, the setting items m1 to m4, n1
To n4 are prohibited (step S108), and the switching key 15
The setting of G is read (step S109), and then step 107 is processed.

When the switching key 15H is set to the upper and lower end correction mode by the operator, the left sewing upper end correction value m
1. Correction value m2 for lower end of left-hand stitch, correction value m3 for upper right-hand stitch, correction value m4 for lower right-hand stitch, correction length n1 for left-hand stitch upper edge, correction length n2 for left-hand stitch lower edge, correction length for right-hand stitch upper end The length n3 and the length n4 for correcting the lower right edge of the right sewing are set.

On the other hand, when the switching key 15H is set to the full length correction mode, a left stitch correction value m5 and a right stitch correction value m6 are set.

In the sewing data creation routine S3, based on the set values of the above items, as shown in FIG.
The length of the side stitching part is the cloth cutting length (a), the gap length (h) between the cloth cutting upper end and the upper bar-tacking part, and the gap length (i) between the cloth cutting lower end and the lower bar-tacking part. ) And the total length (L) of the buttonhole overlock stitch is the length of the side stitching portion (a + h + i) and the length of the upper and lower bar-tacking portions (d, d).
And (a + h + i + 2d).

Each position is set with the lower end of the left sewing portion as the origin in the length direction. In addition, side stitching parts A1, A2
Corresponds to the set value of the bar tack width e of the bar tack portions B1 and B2.

In the upper and lower end correction mode, the correction lengths n1 to n
When 4 and the correction values m1 to m4 are set, the positions of the inner edges of the upper and lower ends of the left and right sewing portions A1 and A2 are corrected.

That is, as shown in FIG. 10, the set correction value m1 is added to the value b on the left side of the knife width in the range of the set length n1 from the upper end of the left sewing portion A1. For example, when the value b is 3 mm and the correction value m1 is 0.5 mm, b
= 3 mm + 0.5 mm, which spreads 0.5 mm to the left in FIG. 9, and the inner edge of the left stitched portion A1 is set to move to the left by 0.5 mm in the range of the length n1.

In the range of the set length n3 from the upper end of the right sewing portion A2, the set correction value m3 is added to the value c on the right side of the knife width. For example, if the value c is 3.5 mm and the correction value m3 is 0.4 mm, c = 3.5 mm + 0.4
The width of the right sewn portion A2 is set 0.4 mm to the right in the range of the length n3.

Similarly, in the range of the set length n2 from the lower end of the left stitch portion A1, a set correction value m2 is added to the value b on the left side of the knife width, and the range of the set length n4 from the lower end of the left stitch portion A2. The value c to the right of the knife width by the setting correction value m4
, And are set by moving the inner edge in each range.

At this time, when the changeover key 15H is set to the upper and lower end correction mode, the changeover key 15G is set because the correction of the outer edge of the side stitching portion is forcibly set to nothing. Since the bar tack width (e) is not corrected, the position of the outer edge does not change.

On the other hand, when the setting items m5 and m6 are set in the full length correction mode, the value b on the left of the knife width is changed to the sum of the setting item m5 and the setting value m5. The value c on the right side of the width is changed to the value of the sum with the setting item m6. These setting items m5 and m6 add the setting,
It can be set to minus, and each inner edge of both side stitches can be moved to the right or left respectively.

As shown in FIG. 11, when the changeover key 15G has the correction of the outer edge, the set value of the bar tack width (e) is corrected by the set values m5 and m6. (E + m5 + m6), and when the correction values m5 and m6 are positive values, the positions of the inner and outer edges of the left sewing portion A1 are corrected to the left by the set value m5, and the inner and outer edges of the right sewing portion A2 are changed. The position of the edge is corrected rightward by the set value m6. When the set values m5 and m6 are negative values, the positions of the inner and outer edges of the left sewing portion A1 are corrected to the right by the set value m5, and the positions of the inner and outer edges of the right sewing portion A2 are shifted to the left. It is corrected by the set value m6.

The corrected data of each item can be stored in the ROM as one pattern.

In the above-described sewing machine, when the operator forms a buttonhole by the initial set values of the respective setting items and the state as shown in FIG. To the upper and lower end correction mode, and set items m1 to m4 and n1 to n4 according to the sewing state.
Is set to a desired value. Thereby, both side stitching parts A1, A
2, the upper and lower edges of each inner edge are modified to open outward, thereby enabling sewing.

At this time, since the outer edge cannot be forcibly corrected, the outer shape of the buttonhole sewing does not change, the design of the sewn product does not change, and the operator does not care about erroneous operation. Work is complete.

On the other hand, when the buttonhole buttonhole is formed by the initial set value, or when the buttonhole buttonhole stitching shape is not the desired shape due to the influence of the fabric and the thread tension, the operator may, for example, move the switching key 15G to the full length. A correction mode is set, desired values are set in the setting items m5 and m6, and the switching key 15H is used to select whether or not to correct the outer edge.

Thus, it is possible to correct left and right with reference to the initially set position of the inner edge of the side seam, and the distance between the cloth cutting knife 12 and the inner edge of the side seam is set to a predetermined value. can do. At this time, if the correction of the outer edge is set to “Yes”, the outer shape of the buttonhole sewing can be increased or decreased laterally. The shape is not changed and can be set according to the balance of the buttonhole sewing shape.

In this embodiment, the description has been given of the sewing machine which forms the sleeping buttonhole sewing. However, in the sewing machine which forms the eyelet buttonhole sewing, the sewing operation is carried out when bar-tacking one end of the side sewing portion. It may be.

Further, the present embodiment may be applied to a sewing machine which forms various patterns like a household sewing machine.

In the present embodiment, the input value of the distance data is corrected by inputting the correction values m1 to m6 as distance data. The value may be corrected by inputting and setting a correction value as position data.

Further, in this embodiment, the width of the side stitched portion is obtained by calculation, and the inner edge of the side stitched portion corresponds to the width of the cloth cutting knife, and the outer edge corresponds to the width of the bar-tacking portion. However, the setting may be performed by the operator as one of the setting items.

In this embodiment, the outer edge of the buttonhole sewing is not corrected in the upper / lower edge correction mode, but the set values m1 to m4 and n1 to n4 are set.
According to, the set value m1,
m3 is added and corrected, and the positions of the outer edges of the upper ends of the side stitches A1 and A2 are added to the knife width right b and knife width left c within the set lengths n1 and n3 by the set values m1 and m3. And set the value m in the bar tack width e of the lower stop B2.
2, m4 is added and corrected, and side stitches A1, A2
May be modified by adding the set values m2 and m4 to the knife width right b and knife width left c within the range of the set lengths n2 and n4.

[0064]

As described above, according to the present invention, according to the first, second, and third aspects of the present invention, after the operator sets the position of the inner end of the side stitch portion with respect to the center of the button hole, When it is desired to correct the position, the correction is made based on the set position, so that the operator only has to input and set the correction value that has a real feeling, so that the work efficiency can be improved and the quality of the sewing product can be improved. Can be maintained.

According to the fourth aspect of the present invention, even if the ends of both side stitches are pulled inward by the bar-tack stitching portion, it is possible to correct and set only the ends to open outward, thereby deteriorating the quality of the sewn product. Is lost.

According to the fifth and sixth aspects of the present invention, it is possible to form a double-sided seam stitch according to the portion of the clothing on which the buttonhole stitch is formed and the purpose.

[Brief description of the drawings]

FIG. 1 is a rear perspective view showing a needle swing mechanism of a buttonhole sewing machine.

FIG. 2 is a front perspective view showing a feeding mechanism of the buttonhole sewing machine.

FIG. 3 is an exploded perspective view of a cloth cutting knife mechanism.

FIG. 4 is a front view of the operation panel surface of the present invention.

FIG. 5 is an explanatory diagram illustrating setting items in the present invention.

FIG. 6 is an explanatory diagram of each part of buttonhole overlock stitching.

FIG. 7 is a control block diagram of the present invention.

FIG. 8 is a general flowchart of the control of the present invention.

FIG. 9 is an extract of a flowchart of an operation panel setting processing routine of the present invention.

FIG. 10 is an explanatory diagram showing correction of a set value when correcting the upper and lower ends of the present invention.

FIG. 11 is an explanatory diagram showing correction of a set value at the time of correcting the total length according to the present invention.

FIG. 12 is an explanatory view of a conventional buttonhole overlock stitch.

13 (a) and 13 (b) are explanatory diagrams for explaining a problem of a buttonhole overlock stitch in the related art.

[Explanation of symbols]

M1 Sewing machine motor M2 Base line motor M3 Needle swing motor M4 Feed motor Cloth cutting air cylinder Operation panel 15G Switching key for full length correction mode and upper and lower edge correction mode 15H Switching key for presence / absence of outer edge correction

Claims (6)

[Claims] (1) A driving unit electrically driven and controlled,
In a buttonhole overlock sewing machine forming a buttonhole overlock stitch by a double-sided stitching portion formed on both sides sandwiching the buttonhole and a bar-tacking sewing portion formed at at least one end of the both-side stitching portion, an inner end of the double-sided sewing portion Means for setting the position of the part, and means for setting the correction position of the inner end part based on the set position of the inner end part of the set both-side stitching part, and A buttonhole sewing machine characterized in that the position can be modified and set. 2. The buttonhole sewing machine according to claim 1, wherein the means for setting the position of the inner end portion or the correction position inputs and sets a set value by a distance. 3. The buttonhole sewing machine according to claim 1, wherein the means for setting the position of the inner end portion or the correction position inputs and sets a set value. 4. The apparatus according to claim 1, wherein said means for setting the correction position is capable of setting the correction position only within a predetermined length range from the bar-tacking stitch portion in said both-side stitching portion.
Buttonhole sewing machine described in 1. 5. The buttonhole overlock sewing machine according to claim 1, wherein at the time of setting the correction position, the position of the outer end portion of the buttonhole overlock stitch is simultaneously corrected. 6. The buttonhole buttonhole sewing machine according to claim 1, wherein the position of the outer end of the buttonhole buttonhole sewing is not changed when the correction position is set.