JPS5844086A - Sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a sewing machine, and more particularly to a sewing machine capable of criss-crossing.

PRIOR ART Conventionally, in this type of sewing machine, for example, when performing a predetermined sewing process (3) in each sewing area A to F on a workpiece cloth as shown in FIG. I had to change the feed rate. Therefore, the work efficiency is low and the operation requires skill.

Therefore, the present applicant has created a standard size (
The number of stitches and data on the amount of offset in each sewing area A to F on the workpiece cloth with sewing length ZS) are stored in advance, and based on the data, the feed amount of the sub feed dog relative to the main feed dog is set in each sewing area A. ~ By controlling the changes for each F, it is possible to perform serration sewing with good work efficiency, and even when performing serration sewing on workpiece fabrics that differ only in size (sewing length Z), as shown by the solid line in Fig. 3. Converting the data into a uniquely determined ratio corresponding to the size, and applying the fixed ratio to various work cloths of different sizes based on the uniquely determined new data (4) He was the first to file an application for an invention that made sewing easier.

However, if the work fabric is cut in advance so that the amount of creasing (-cropping rate x sewing length) is always constant as shown by the broken line in Figure 3 even when the sizes are different, for example, As shown in the figure and FIG. 5, the amount of creasing Y1 (
=2πrl -2πr2) and the amount of creasing (-2πr
3-2πr4) If the sleeve facing 1 and the fabric for the shaft part are cut so that the offset stitching is performed with the same amount, or the amount of offset stitching is determined by a unique ratio depending on the size. If the work fabric is cut at various ratios to the size, this method is useful for sewing work in which the work fabric is sewn with the optimum serration amount for the cut work fabric. could not be handled by the sewing machine that was applied for earlier.

OBJECTS An object of the present invention is to provide a sewing machine that can easily handle the various sewing operations mentioned above.

Therefore, the inventors of the present invention have considered the dimensions of various cut processed fabrics in view of the above problems, and have found that although there are various design patterns for these processed fabrics as described above, there is only one design pattern. There is some kind of relationship between the series of work fabrics cut by the above, and if you understand these relationships, you can easily sew each size of work cloth with the desired amount of serration on various work fabrics of different sizes from the standard size. It has been found that desired data on the amount of serration for serration stitching in each sewing area for different workpiece cloths can be easily obtained based on the serration amount data and the number of stitches of the reference size.

That is, based on the data on the amount of unevenness and the number of stitches in each sewing area A to FK on the workpiece cloth of the standard size (sewing length Zs), the data shown in FIG. When the amount of set-up (-set rate x sewing length) Y changes proportionally as shown by the solid line, the amount of set-up Y for a certain sewing length Z is: Y-1 ((Z-2S) + YS...・(1)k
; Expressed by a proportionality constant. Ys represents the amount of creasing in the sewing length Zs of the standard size. That is, the straight line shown by the solid line in FIG. 3 is expressed by equation (1).

Now, let the rate of change of the sewing length Zs of the standard size be
- Shrinkage Ys/Sewing length Zs) If the rate of change in Qs is y, then equation (1) is Ys (1+x) (4+y) = lc (Zs (1+x) -Zs) 1 Ys
・” Since it is expressed as (2), the coefficient 1 (is, (2)
From the formula, 2(Ys (1+x) (1+y) -Y
s ) / [Zs (i+x) - Zs ) ・・
... is expressed by (3), and the rate of change y of the above-mentioned false rate Qs is 1+y-(k (Zs (1+x)-Zs ) +Ys from equation (7) (2)
')/Ys(1+x)... (4)

Now, if the amount of distortion Y is constant, the coefficient must be 0, so equation (4) is 1+y=1/(1+x
) ...(5).

In other words, the rate of change y in the settling rate Qs in the standard size is a function of the rate of change X in the sewing length ZS. Therefore, the sewing length Z
If the value of (with respect to the sewing length Zs of the reference size) and k are known, the rate of change y can be found. In other words, even if the sewing length Z changes, the value of the proportionality constant can be set to the value of Tokoro Sakaki, based on the unambiguous set-up amount data determined by a unique ratio to the reference size shown by the solid line in Fig. 3. By changing the amount of distortion to the standard size, the amount of distortion can always be kept constant or at a desired value with respect to the amount of distortion of the reference size.

(8) An object of the present invention is to perform criss-cross stitching with a desired crimp amount on various work cloths of different sizes from standard sizes when sewing various work cloths cut in advance according to various design patterns, based on the above-mentioned method. When sewing workpiece fabrics of different sizes from those standard sizes, the sewing data from the sewing data setting means that can be operated by the operator is optimized for the sewing work based on the data on the amount of crimp for each standard size. To provide a sewing machine which can automatically calculate data on the amount of unevenness for performing uneven stitching with a certain amount of unevenness and can handle sewing work of work cloths cut based on various design patterns.

EXAMPLE Hereinafter, an example of a sewing machine embodying the present invention will be described based on the drawings.

In FIG. 6, the sewing machine 11 is fixed to a table 13 with a start switch 12 disposed at the lower right side, and its sewing machine needle 14 cooperates with a double ring looper (not shown) to form a stitch forming mechanism. Then, a double chain stitch is formed on the work cloth K. Throat plate 1 equipped with a needle hole through which the sewing needle 14 passes
5 forms a work cloth supporting surface by its upper surface and the upper surface of the table 13, and the main feed dog 1 is provided on the work cloth supporting surface 5.
B and the sub-feed dog 17 are adapted to retract. The regenerative and auxiliary feed dogs 16 and 17 work together with a presser foot (not shown) attached to the tip of the presser arm 18 to
This constitutes a processing cloth feeding device for feeding the fabric in one direction.

The main feed dog 16 is drivingly connected to a known swing mechanism that determines the amount of feed to the work cloth so that the amount of feed is constant. The sub-feed dog 17 is also drivingly connected to the swing mechanism,
The amount of feed is varied based on the forward and reverse rotation of a pulse motor PM which is drivingly connected to the adjustment shaft 19 of the swing mechanism via a gear 20.21. In this embodiment, when the pulse motor PM is driven in the normal rotation, the feed amount of the sub-feed dog 17 increases, and on the contrary, when the pulse motor PM is driven in the reverse rotation,
The amount becomes smaller.

Therefore, while the main feed dog 16 has a fixed cloth feed amount, the cloth feed amount of the sub feed dog 17 can be changed as appropriate by driving and controlling the pulse motor PM. becomes possible.

A cloth guide control device 22 installed on the cloth feeding side of the sewing machine 11 detects the side edge Ka of the workpiece cloth to be sewn using a servo sensor 23, and adjusts the rotation wheel 24 based on the detection signal. The workpiece cloth K is controlled to be accurately guided to the sewing position by performing rotational or reverse rotation control.

Next, sewing areas A, C, and D are created between starting sewing in sewing area A and finishing sewing in sewing area F on the work cloth of the reference size shown in FIG.

As shown in FIG. The sewing machine 11 is designed to be able to continuously perform overedge stitching (the cloth feed amount of the main feed dog 16 and the sub feed dog 17 are the same).
A control device for controlling the drive will be explained. In addition, there is a seam area U in the sewing area B of the work cloth, and within the seam area U there is a seam allowance area P that overlaps with the seam allowance Kb, and a part of the seam allowance Kb is overlapped on the work cloth. It protrudes from the side edge Ka.

Now, the control device is integrated into a control box 25 provided at the back right of the table 13 shown in FIG. 6, and five memory select switches MS1 to MS5 that interlock with each other are provided on the left front side of the control box 25. . And this 5
The memory select switches MS1 to MS5 cooperate with the mode select switch MSS, which will be described later, to control the microcomputer MC, which will be described later, built in the control pocket (12).
Then, for the processed cloth K having the sewing areas A to F with different sewing methods, and the seam and seam allowance areas U and P,
When programming the number of stitches (hereinafter referred to as the number of stitches) and data on the amount of sagging in each area A to F, U, and P in the six sewing patterns, one of the programs for the six sewing patterns is programmed. Select sewing machine 1
1 is operated according to the program, '7I is selected.

The six offset correction switches 5WA to 8WF provided at the center of the front surface of the control box 25 are digital switches, and each increases or decreases the offset amount data corresponding to each sewing area A to F on the programmed work cloth. After modification, each area A 7F can be sewn with an arbitrary amount of creasing. Therefore, for example, if you want to modify the programmed sagging amount data in sewing area A (without erasing the programmed sagging amount data from the program), you can do so by operating the sagging correction switch SWA. .

The open area correction switch SWU provided above the correction switch SWA is a digital switch.
As shown in the figure, in the stitching area U within the sewing area B, the preprogrammed stitch count data can be increased or decreased to allow sewing of the stitching area U on the workpiece cloth.

The correction data setting switch SWK provided on the right side of the open area correction switch SWU is composed of a digital switch, and is configured to adjust each sewing area A to F programmed in advance.
This is used when correcting the data on the amount of distortion to an appropriate ratio with respect to the sewing length. Correction data setting switch SWK
The total number of stitches correction switch SWT provided on the right side of the screen is composed of a digital switch, which converts the preprogrammed counts of each sewing area A to F into a predetermined ratio to the total number of stitches, and calculates the number of stitches based on the ratio. Then, the work cloth K can be sewn by correcting the programmed stitch count data of each area A to F.

-4, control box 25 glue? Data select located in the center of the right side of I side!・Switch DSS is a digital switch, and is configured to set the number of stitches and swage data for each sewing area A-F, stitching and sewing areas U and P. Each time the data input switch INS on the left side is pressed, the count and set amount data set by the data select switch DSS are programmed into the microcomputer MC, which will be described later. The value is now displayed. Also, input switch I
The stitch number indicating lamp L(15)1 and the setting setting indicator lamp L2 provided above the NS are controlled to turn on alternately when stitch number data and setting setting amount data are sequentially programmed into the microcomputer MC.

The mode select switch MSS is a rotary switch that can be operated in 8 different ways. Ru.

Furthermore, when sewing the work cloth K according to the programmed program (hereinafter referred to as first sewing), the mode select switch MSS selects each of the programmed sewing areas A.
- When sewing is performed by correcting the uneven stitch amount data of F based on the correction data based on the selection operation of each of the uneven stitch correction switches 5WA to 8WF (hereinafter referred to as second sewing), each of the programmed sewing areas The number of stitches A to F (16) is corrected to a predetermined ratio based on the correction data based on the selection operation of the total number of stitches correction switch SWT, and the work cloth K is sewn based on the corrected number of stitches. (hereinafter referred to as third sewing), correct the stitch count data and sagging amount data of each of the programmed sewing areas ANF to a predetermined ratio based on the correction data based on the total stitch number correction switch SWT, When sewing a processed cloth K based on the modified number and the amount of data contained (hereinafter referred to as the fourth sewing), the amount of data contained in each program -made area A to F is the correction switch 5wanswfFF. amended based on the corrected data of
And the stitch count data of each sewing area A-F and the corrected offset amount data are sent to the total stitch count correction switch S.
When sewing the work cloth K based on the corrected stitch count and offset amount data after correcting it to a predetermined ratio based on the corrected data of the WT (hereinafter referred to as the 5th sewing), and each of the programmed sewing The data on the amount of sagging in areas A-F is corrected to an appropriate ratio to the sewing length based on the correction data based on the correction data setting switch SWK and the number of stitches correction data based on the total number of stitches correction switch SWT. , when sewing the work cloth K based on the corrected number of stitches and data on the amount of sagging (hereinafter referred to as 6th sewing)
You can choose from 6 options.

Next, the control circuit built into the control box 25 will be explained.

In FIG. 7, the microcomputer MC includes a central processing unit CPU, a read-only memory IJROM, a readable and writable memory IJRAM, and an input/output capacitor) I.
It is composed of OP. Each input terminal of the input/output board has the memory and mode select switches MS1 to
MS5, MSS.

Iset correction switch 5WA-8WF, open area correction switch SWU, correction data setting switch SWK, total number of stitches correction switch SWT, and data selection and data input switch DSS.

INS and start switch 12 are connected, and each output terminal of the doujin output boat IOP is connected to a sewing machine motor M.
A sewing machine motor drive circuit 31 that drives and controls the pulse motor PM, and a pulse motor drive circuit 32 that drives and controls the pulse motor PM.
, a display drive circuit 33 for driving and controlling the stitch number indicating lamp L1, the set-up indicating lamp L2, and the display device DSP are connected. In addition, at the input terminal of the IOP (input/output capo) there is a needle position detector 35 that detects the position of the sewing machine needle 140 based on the rotation of the sewing machine main shaft 34 etc. which is drivingly connected to the sewing machine motor MM, A stitch number counter 36 is connected to count the number of stitches based on a signal.

On the other hand, the readable and writable memory RAM stores sewing programs of five sewing patterns for the memory select switches MS1 to MS5, data select switches DSS and data (19), and also stores sewing programs for each sewing area of the sewing program. A-F
Pulse motor PM corresponding to the sagging amount data in
The direction and amount of rotation are stored in memory.

Next, the operation of the sewing machine constructed as described above will be explained with reference to the flowcharts of the microcomputer MC shown in FIGS. 8 to 10.

Now, when the power-on switch (not shown) is pressed, the microcomputer MC executes an initialization routine according to the flowchart of FIG. 8, and various registers, flags, etc. are reset.

Next, the operator switches the mode select switch MSS to the program mode in order to program each sewing area of the standard size (sewing length ZS) in the sewing pattern based on the memory select switch MS1, the number of stitches from A to F, and the amount of crimp amount data. (20) When the memory select switch MS1 of the five memory select switches MSI to MS5 is pressed, the microcomputer MC manually outputs the memory select signal SGMS1 of the memory select switch MS1, stores it in the register, and selects the mode select switch. The MSS program signal MSSP is input and stored in the register. Then, based on the programmed fMssP, the microcomputer MC programs the sewing pattern based on the memory select switch MS1 according to the flowchart 1 shown in FIG. The operation of writing the number of stitches and the amount of offset data to a predetermined address in the memory IJRAM is executed. This programming operation is the same as the programming operation described in the specification of Japanese Patent Application No. 5S-38054 filed by the present applicant on March 24, 1980. It will be easily understood if you refer to the book.

When the operation of writing the sewing pattern program based on the memory select switch MS1 to a predetermined address in the memory RAM is completed, the other four memory select switches MS2 to MS5 are sequentially operated in the same manner.
As shown in FIG. 11, each memory select switch MS1
The number of stitches and criss-cross sewing data in each sewing area A to F, U, and P of each sewing pattern serving as a reference based on ~MS5 are stored in the memo IJRAM.

Therefore, in this embodiment, the memory select switch MS1
~Based on the operation of the MS5, the memo IJRAM stores data for uneven stitching of five sewing patterns.

Then read and write memory RAM as described below.
A case will be described in which crooked stitching is performed on the work cloth K based on the sewing program written in the sewing machine.

Now, select the memory select switch MS1, and as shown in FIG. 11, each sewing area A to F, U,
6th sewing based on the stitch number data Aa-Fa, Ua, , Pa of P and the criss-cross finger data YA-YF, that is, each sewing area A to F, U.

The correction data setting switch S
Stitch count data Aa for each sewing area A to F based on correction data based on WK and the total stitch count correction switch SWT
~ Correct the sewing length to an appropriate ratio based on the stitch number correction data for converting Fa to a predetermined ratio, and then create the desired staking depth based on the corrected number of stitches and staking amount data. A case will be described in which the work cloth K is sewn with the same amount.

Now, when the operator switches the mode select switch MSS to the sixth sewing mode from the state where the memory select switch MS1 is pressed, the microcomputer MC switches to the mode set (23) and the left switch MSS switches to the sixth sewing mode, as shown in FIG. After determining that the select switch MSS is not in the program mode or monitor mode based on the mode select signal MSS6 outputted when the sewing mode is switched to 6-sewing, the data creation operation is started.

According to the flowchart shown in FIG. 10, the microcomputer MC first selects the mode select switch MSS.
After inputting the mode select signal MSS6 from the memory select switch MS1 and the memory select signal SGMS1 from the memory select switch MS1, the mode and memory select switches MSS and M are input based on the output signals MSS6 and SGMS1.
After determining whether or not there has been a switching change of S1, the operation of the starting switch 12 is waited.

Then, when the operator presses the start switch 12, the routine for calculating the memory select signal SGMS1 reaches a routine for storing the calculated memory select signal SGMS1, and during this time (24) Memo' is stored in the JRAM. Among the five sewing programs, the sewing program based on the memory select switch MS1 (see FIG. 11) is read out. Next, the microcomputer MC inputs the mode select signal MSS1,
Based on the signal M'SS1, it is determined that the sewing is the sixth sewing, and the operation moves to create program data for performing the sixth sewing.

First, the microcomputer MC controls each sewing area A-F.
, U, P stitch number data Aa-Fa, UaPa, sewing completed stitch number data XA-XF of each sewing area A-F, sewing start position stitch number data XU of sewing area U, and sewing completed position of sewing area P The values of the number of stitches data XP are respectively XA=Aa XB-Aa+Ba X C= A a + Ba + CaX D =
A a 10B a 10Ca + D aX E= A
a + B a + Ca 10D a + E aX
F = A a + B a 10 Ca 10 D a +
It is determined by the following equations: E a + F aXU = Aa + Ba - Ua XP = Aa + B'a - Ua + Pa.

Subsequently, the microcomputer NC receives a total correction signal 5GSWT output from the total correction switch SWT.
The ratio calculated based on (=1±V/100, V
;)-t)L'modification switch 8etT set value)
Based on the obtained stitch number data XA-XF, stitch number correction data is calculated and created as shown in Fig. 12, and a memo I is created.
Store it at a predetermined address in JRAM. Next, the microcomputer MC selects the rate of change X (-±V/100) of the stitch count data for each sewing area A-F' and the correction data setting switch S.
Based on the correction data (the proportionality constant k) set based on the operation of WK, first calculate the amount of sagging in each sewing area A-F, that is, the sagging rate in the sagging amount data YA-YF according to the equation (4). Find the rate of change y. At this time, operate the correction data setting switch SWK so that even if the stitch count data of each sewing area A to F changes, the amount of sagging of each area A to F does not change. If () is set to O, the rate of change y in each area A to F is as follows.

When the rate of change y is determined, the microcomputer MC corrects it based on the change rate y and the data YA to YF of the amount of unevenness in each sewing area A-F, and creates the amount correction data YAS as shown in FIG. (-YA(1-1-y))
~YFS (=YF(1-1=y)) is calculated and stored at a predetermined address in the memory RAM.

After creating the data for the sixth sewing and storing it in the memo IJRAM, the microcomputer MC next executes the sewing operation based on this data. First, when a drive signal is output to path 31 (27) to start driving the sewing machine motor MM, the data YAs for correcting the amount of erging of the sewing area A is read out, and the erging stitches are sewn at the erging rate corresponding to the data YAs. The pulse motor P
A drive control signal is output to the pulse motor drive circuit 32 in order to drive the sub-feed dog 17 and make the feed amount of the sub-feed dog 17 larger than that of the main feed dog 16, and at the same time, the address of the memory RAM is incremented and data for correcting the number of completed stitches is sent. XA(1±
V/100). Therefore, at the same time as the sewing machine 11 is driven, criss-cross stitching on the workpiece cloth in the sewing area A is started. As the sewing machine motor MM is driven, the stitch count signal from the stitch count counter 36 is calculated to calculate the stitch count correction data XA (1±V/100).
) and the number of stitches counted by the counter 36, and waits for completion of criss-cross stitching in area A.

(28) When the number of stitches reaches the stitch number correction data XA (1±V/100), that is, when the sewing of area A is completed, the microcomputer MC reads the correction data YES for the amount of unevenness in area B, and The pulse motor PM is driven and controlled based on YBs, and the sewing completed stitch number correction data XB (1±V/100
) is read out. Then, the process waits for the completion of sewing in sewing area B in the same manner as described above. In addition, this counting correction data XB (
1±V/100), the microcomputer MC reads the sewing start position stitch number data XU of the sewing area U and the sewing completion position stitch number data XP of the sewing area P. The purpose of this device is to drive and control the work cloth guide device 22 and prevent the device 22 from malfunctioning due to the seam allowance Kb on the work cloth, so the details of its operation are not directly related to this invention and will therefore be omitted.

When the sewing in the sewing area B is completed, the microcomputer MC changes the correction data Y for the amount of unevenness in the sewing area C.
C8 is read out, and the pulse motor PM is driven and controlled so as to be able to perform erging stitches at the erging rate corresponding to the data YC8, and data for correcting the number of completed stitches in area C (1
±V/100) is read out, and criss-cross stitching in the same area C is started.

Thereafter, the same operation as above is repeated up to the sewing area F, and after the crimp stitching is performed on the workpiece cloth, the microcomputer MC outputs a stop control signal to the sewing machine motor II movement control circuit 31 to stop the sewing machine motor MM. When this is done, one round of sewing on the work cloth K is completed and preparations are made for sewing the next work cloth.

At this time, the amount of unevenness Y Y = (YAs - XA + YBs (XB - XA) + Y
Cs (XC-XB) + YFs (XF-XE)) (1±V/100) = [Y
A-XA ten YB (XB-XA) + YC (XC-XB) ten--o ten YF (XF-xE) l (1±V/100) (1+y)
= (YA-XA×YB(XB-XA)+・・・・+Y
F(XF-XE))(1±V/100)/(1±V/1
00) -YA-XA+YB(XB-XA)+YC(XC-XB)+...YF(XF-XE) This is the same amount as the amount of offset stitching.

Therefore, in this case, even if the sewing length Z of the workpiece fabric differs from the sewing length of the standard size, simply operate the correction data setting switch SWK to set the correction data to O, and the sewing length Z of the workpiece cloth will always be set to the standard size regardless of the sewing length 2 of the workpiece cloth. It is possible to perform the same crisscross stitching as the crisscrossing amount Y for the size.

In addition, if you want to sew the work cloth K of a size different from the standard size with a desired serration stitch (31) other than the same serration amount as the standard size, set the correction data setting switch SWK to an appropriate value. In this case, it is possible to sew the desired amount of creasing using the same method as described above.

In this embodiment, it is possible to execute the first to fifth sewing by appropriately switching the mode select switch MSS to the first to fifth sewing modes, as shown in FIGS. 13 to 17, respectively. Data as shown in is created and stored in the memo IJRAM, and sewing is executed. This data creation and sewing operation is the same as the operation described in the specification of Japanese Patent Application No. 55-38054 filed by the present applicant on March 24, 1980, and regarding these operations, please refer to the specification. It will be easily understood if you refer to it.

In the above embodiment, it is assumed that the change in the amount of set-up with respect to the sewing length Z changes linearly as shown in FIG. 3, but if this is the curve (32), then the curve is a high-order polynomial (ao+a1x+a2
X2 + ... + an Of course, it is also possible to do so.

Effects As detailed above, the present invention is capable of sewing various work fabrics of different sizes from standard sizes with a desired amount of serration when sewing various work fabrics cut based on various design patterns. Even if you want to do it, the amount of serration can be easily and automatically set in advance from the data for serration stitching on a standard size workpiece fabric, so it can be used for a variety of sewing tasks and improve the efficiency of sewing operations. Additionally, it can be easily operated even by non-experts.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a processed cloth for explaining this invention, Fig. 2 is a perspective view of a processed fabric similarly sewn with uneven stitching,
The figure shows the relationship between the amount of creasing and the sewing length, Figures 4 and 5 are explanatory diagrams showing the relationship between the sleeve crease and the sleeve, Figure 6 is a perspective view of the sewing machine, and Figure 7 is Electrical block circuit diagram, No. 8
1 to 10 are flowcharts of the microcomputer, and FIGS. 11 to 17 are diagrams showing contents stored in a readable and writable memory. Sewing machine 11, start switch 12, sewing machine needle 14, main feed dog 16, sub feed dog 17, control box 25, sewing machine motor drive circuit 31, pulse motor drive circuit 32,
Sewing machine main shaft 34, needle position detector 35, needle number counter 36
, to the processed cloth, sewing areas A to F, pulse motor PM,
Sewing machine motor MM. Memory select switch MS1 to MS5. Mode select switch MSS, correction data setting switch SWK,
) - Tall stitch number correction switch SWT, set correction switch 5WA-8WF, microcomputer MC, data selection switch DSS. Read and write memory lJRAM, data input switch lN50 Patent applicant Brother Industries, Ltd. Agent Patent attorney OnFli + Hironori (35) Figure 1

Claims (1)

[Claims] 1. A stitch forming means including a reciprocating sewing machine needle (14), a first cloth feeding means (16) and a second cloth feeding means (17).
) and a cloth feeding device that can adjust the amount of cloth fed to change the amount of sagging. Second cloth feeding means (16), (
A drive means (PM) for changing the amount of set-up operatively connected to either one of the sewing areas (A-17) and a driving means (PM) for changing the amount of set-up for each of the sewing areas (A-F) divided into a plurality of continuous sewing areas (A-F). a first storage means (RAM) capable of storing the number of stitches in F); a second storage means (RAM) capable of storing data on the amount of unevenness in each sewing area (A-F); A counting means (36) for counting pulses generated in synchronization with the reciprocating motion of the sewing machine needle (14), and sewing in each sewing area (A-F) stored in the first storage means (RAM). a stitch number correction data setting means (5WT) for proportionally correcting all the stitch numbers; and a stitch number correction data setting means (5WT) for adjusting the number of stitches stored in the first storage means (RAM) and the stitch number correction data setting means (5WT). a first calculating means (MC) for calculating the number of stitches in each sewing area (A-F) based on the correction data set by the SWT); a correction data setting means (SWK) for correcting the data of the correction amount of correction data set by the correction data of the correction data of the number of stitches; a second calculating means (MC) for calculating the amount of erging data in each of the sewing areas (A-F) based on the correction data set by the means (SWT); The count value and the first calculation means (
MC) and the number of stitches calculated by the second calculation means (MC), and based on the comparison result, a drive signal is sent to the drive means (PM) in accordance with the data on the amount of folding calculated by the second calculation means (MC). A sewing machine characterized by being provided with a control means (MC) for feeding.