JPH0225638B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a sewing machine, in particular, a first cloth feeding means, a second cloth feeding means, and at least one of the first cloth feeding means and the second cloth feeding means. The present invention relates to a sewing machine including a driving means connected to one of the cloth feeding means and for changing the cloth feeding amount of one cloth feeding means relative to the cloth feeding amount of the other cloth feeding means.

[Prior Art] Conventionally, in this type of sewing machine, when performing crisscross stitching on a workpiece cloth, for example, it was necessary to change the feed amount of the main feed dog and the sub feed dog during sewing. Therefore, it required skill to operate.

Also, when using a lockstitch sewing machine or the like to sew the fabric, loosen the thread tension of the sewing machine, sew the fabric, pull the thread after sewing, remove the stitches, and use an iron to sew. I found a way. However, this method required a large number of work steps, resulting in poor work efficiency.

In order to solve these problems, the cam is mechanically linked to the swinging lever that gives feed motion to the feed dog, and the swing angle of the lever is adjusted to allow the main feed dog and sub feed dog to move. Conventionally, methods have been proposed in which the fabric is automatically skewed by changing the amount of fabric feed. but,
In this conventional configuration, for example, FIGS.
As shown in the figure, if you want to change the ratio of sagging in each sewing area A to F of the work cloth K (hereinafter referred to as the sagging amount), you must replace each cam with a cam of the predetermined amount of sagging, and the work There was a defect that reduced efficiency. Moreover, in order to make it possible to perform serration stitching with any serration amount, a large number of cams corresponding to each serration amount are required, resulting in a very complicated problem.

In order to solve this problem, it is conceivable to not use the cam but to automatically control each feed amount of the front and rear cloth feed teeth by a control device according to the number of stitches.

In this case, if the amount of set-up in each of the sewing areas shown in FIGS. 1 and 2 is different, a step will be formed between adjacent sewing areas due to the difference in the amount of set-up, and A problem arises in which the sewing transitions are not finished neatly.

[Objective] The present invention has been made to solve the above-mentioned problems, and its object is to provide a sewing machine that can neatly finish the transition part of the sewing when performing erging stitches. be.

[Embodiment] Hereinafter, an embodiment of a sewing machine embodying the present invention will be described based on the drawings.

In FIG. 3, a sewing machine 1 is fixedly mounted on a table 3 with a start switch 2 disposed at the lower right side, and its sewing needle 4 cooperates with a double ring looper (not shown) to form a stitch forming mechanism. , double chain stitches are formed on the work cloth K. A needle plate 5 having a needle hole through which the sewing needle 4 passes is connected to its upper surface and to the table 3.
A work cloth support surface is formed by the upper surface of the work cloth support surface, and a main feed dog 6 and a sub feed dog 7 are designed to protrude and retract on the work cloth support surface. The main and sub feed dogs 6, 7 cooperate with a presser foot (not shown) attached to the tip of the presser arm to feed the work cloth K in one direction.

A servo sensor 10 is attached to the support arm 9 disposed on the cloth feeding side of the sewing machine 1 so as to be located above the throat plate 5, and the servo sensor 10 is connected to a light emitting element 10a such as a light emitting diode It consists of a light receiving element 10b such as a transistor, and the light receiving element 11b detects the light from the light projecting element 10a via a reflecting plate 11 embedded in the needle plate 5. And this reflector 11
The side edge Ka of the work cloth K passing above blocks part of the light from the light emitting element 10a, and the light receiving element 10b detects the side edge Ka of the work cloth K according to the amount of light received. There is.

The main feed dog 6, the main feed table 21, etc. constitute a first cloth feed means, and the sub feed dog 7, the sub feed table 22, etc. constitute a second cloth feed means.

On the cloth feeding side of the throat plate 5, a part of a rotary wheel 12 is projected onto the work cloth support surface so as to engage with the work cloth K, and the rotary wheel 12 is attached to the lower surface of the table 3. A fixed servo motor (see Figure 5) is fixed to the motor shaft of SM, and the workpiece cloth K
It is designed to rotate around an axis that is approximately parallel to the feeding direction. When the servo sensor 10 detects that the side edge Ka of the work cloth K is aligned with the center line of the reflector 11, the servo motor SM is controlled to stop, and the side edge Ka of the work cloth K is controlled to stop. When is displaced left and right with respect to the center line, the servo motor SM is controlled to rotate forward or backward, and the rotating wheel 12 moves the work cloth K so that its side edge Ka is located on the center axis of the reflecting plate 11. It is now possible to control the drive.

A pressure roller 13 is attached to the tip of the support lever 15 rotatably supported by the support 14 on the table 3 so as to correspond to the rotating wheel 12, and is connected to the rear end of the support lever 15. The air cylinder (see Fig. 5) is moved up and down by the up and down movement of the piston rod 16 of the PS. When the pressing roller 13 descends, it cooperates with the rotary wheel 12 to clamp the work cloth K and move the work cloth K in the lateral direction perpendicular to the cloth feeding direction, that is, from side to side. When the pressure roller 13 rises, the pressure on the work cloth K is released.

Next, the cloth feeding mechanism of the main feeding dog 6 and the sub feeding dog 7 provided on the lower surface of the table 3 will be explained.

As shown in FIG. 4, the main feed dog 6 and the sub feed dog 7 are connected to a main feed table 21 and a sub feed table 22, respectively.
It is fixed to the tip of the A feed guide sesame 24, which is rotatably attached to a guide shaft 23, is fitted into the two prongs at the rear ends of both the feed tables 21, 22 so as to be able to move relative to the feed tables 21, 22 in the longitudinal direction. An eccentric cam 26 for vertical feeding on a sewing machine main shaft 25 driven by a sewing machine motor (see FIG. 5) MM is fitted into the recessed portion of the lower surface via an eccentric ring holder 27. Therefore, as the main shaft 25 of the sewing machine rotates, the vertical feed eccentric cam 26 moves eccentrically, and the main and sub feed teeth 6, 7 are both moved vertically in synchronization.

Next, we will explain the back-and-forth movement of the main and sub-feed dogs 6 and 7, that is, the swing mechanism in the feed direction that determines the feed amount of the work cloth. Just by fixing the
Since it is basically the same as the sub-feed dog 7, only the feeding mechanism of the sub-feed dog 7 will be described below.

Eccentric cam 28 for forward and backward feeding shown by the two-dot chain line in Fig. 4
is fixed to the main shaft 25 of the sewing machine, and the proximal end of the rod 29 is connected to its outer cam surface. On the other hand, the tip of the rod 29 is connected by a shaft 32 to the tip of a swinging arm 31 fixed to a swinging shaft 30. Therefore, when the main shaft 25 of the sewing machine is rotated, the rod 29 is reciprocated by the eccentric cam 28 for forward and backward feeding, and the rod 29 is moved back and forth through the swing arm 31 to the swing shaft 30.
is rotated back and forth within a predetermined rotation range. The arc-shaped sending arm 33 is fixed to the swing shaft 30 at its base end, and is rotated back and forth as the swing shaft 30 rotates back and forth.

The pulse motor PM is driven in forward and reverse directions by a drive signal from a control circuit to be described later, and its drive shaft is drivingly connected to an adjustment shaft 36 via gears 34 and 35. Adjustment lever 3 that constitutes the link connection mechanism
7 is fixed to the adjustment shaft 36 at its base end,
It is designed to be rotated by the drive of the pulse Morse PM. The adjustment link 38, which also constitutes the link connection mechanism, is rotatably connected at its lower end to the tip of the adjustment lever 37 by a pin. Sliding piece 39 as a feed change member
The tip of the feed arm 33 is fitted into the fitting hole 39a, and the tip of the adjustment link 38 is rotatably connected to one side of the feed arm 38 by a shaft pin 40. A link 42 is rotatably attached at one end to the other side of the sliding block 39, and the other end is rotatably connected to the central side wall of the sub-feed table 22 by a shaft pin 41. There is.

Therefore, as the swing shaft 30 rotates, the feed arm 3
The sliding block 39 is moved back and forth through the link 4.
2, the sub-feed table 22 is reciprocated in its longitudinal direction, that is, in the cloth feeding direction. Now, when the pulse motor PM is driven forward in the direction of the arrow, the adjustment shaft 36, the adjustment lever 37, the adjustment link 3
8 etc., the sliding block 39 is moved up and down and engaged near the tip of the feed arm 33, so the range in which the sliding block 33 is driven becomes large, and the sub-feeding The cloth feed amount of tooth 7 increases.
Conversely, when the pulse motor PM is reversely driven in the opposite direction, the sliding piece 39 is moved by the adjustment link 38 and engaged near the base end of the feed arm 33, so that the sliding piece 39 is moved in the opposite direction. As the range in which the sesame 39 is driven becomes smaller, the cloth feed amount of the sub-feed dog 7 becomes smaller.

Therefore, the main feed dog 6 has a fixed cloth feed amount.
On the other hand, the cloth feed amount of the sub-feed dog 7 is controlled by the pulse motor.
By driving and controlling the PM, it can be changed as appropriate, and the work cloth K can be skewed. The pulse motor PM, the adjustment shaft 36, the adjustment lever 37, the adjustment link 38, the sliding piece 39, etc. constitute a driving means.

Next, during the period from starting sewing from sewing area A of work cloth K shown in FIG. Sewing stitches with different staking amounts (the fabric feed amount of the sub-feed dog 7 is larger than the fabric feed amount of the main feed dog 6) are used, and normal hem stitches are used in sewing areas B and F. A control device for driving and controlling the sewing machine 1 so that the feed amount of the main feed dog 6 and the sub feed dog 7 can both be the same will be described. In addition, there is a seam area U in the sewing area B of the processed cloth K, 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 not processed. Side edge Ka of cloth K
It's sticking out.

Now, the control device uses the table 3 shown in FIG.
The control box CB is located in the back right corner of the control box, and on the left side of the front there are five memory select switches MS1, MS2, and MS that interlock with each other.
3, MS4, and MS5 are provided. and,
These 5 memory select switches MS1 to MS
5 is a process that requires the microcomputer MC (described later) built into the control box CB in collaboration with the mode select switch MSS (described later) to each sewing area A to F with different sewing methods, seam and seam allowance areas U and P. For cloth K,
Each area A~ in five sewing patterns (for example, sewing patterns for men, women, children, etc.)
When programming the number of stitches F, U, and P (hereinafter referred to as the number of stitches) and the amount of sagging data, select one of the five sewing pattern programs and run the sewing machine 1 according to that program. Selection operation is performed when driving with

There are six correction switches SWA, SWB, and
SWC, SWD, SWE, and SWF consist of digital switches, and each of them increases or decreases the sagging amount data corresponding to each sewing area A to F of the programmed work cloth K, and each area A to F can be adjusted to any desired value. It is designed so that it can be sewn with a certain amount of unevenness. Therefore, for example, if you want to correct the programmed data on the amount of uneven stitching in sewing area A (without erasing the programmed amount of uneven stitching from the program), press the uneven stitching correction switch.
This is possible by operating SWA.

The open area correction switch SWU, which is installed above the skew correction switch SWA, is a digital switch that increases or decreases the preprogrammed stitch count data in the sewing area U located within the sewing area B, as shown in Fig. 1. correct,
The sewing area U of the work cloth K can be sewn.

The total stitch count correction switch SWT installed on the right side of the open area correction switch SWU is composed of a digital switch, and adjusts the number of stitches in each of the previously programmed sewing areas A to F to a predetermined ratio to the total number of stitches. The work cloth K can be sewn by converting and correcting the programmed stitch count data or crimp amount data of each area A to F based on the ratio.

On the other hand, the data select switch DSS installed at the center of the front right side of the control box CB consists of a digital switch, and is used to set the number of stitches and erging amount data for each sewing area A to F, seam and seam allowance areas U and R. It's summery.
Each time the data input switch INS on the left side is pressed, the data on the number of stitches and the setting amount set by the data select switch DSS is programmed into the microcomputer MC, which will be described later. The data values are displayed on a display device DSP consisting of a segment display tube. In addition, the number of stitches indicator lamp L1 provided above the data input switch INS
The setting instruction lamp L2 is controlled to turn on alternately when stitch count data and setting amount data are sequentially programmed into the microcomputer MC.

The mode select switch MSS consists of a rotary switch and can be operated in 7 ways. When you want to program by operating the data select switch DSS and data input switch INS, or when you want to monitor the programmed program. be operated on.

In addition, when sewing the work cloth K according to the programmed program (hereinafter referred to as the first sewing), the mode selector switch MSS transmits the data of the offset amount of each of the programmed sewing areas A to F to each of the offset correction switches. When modifying and sewing based on the selection operation of SWA to SWF (hereinafter referred to as second sewing), the programmed stitch count data of each sewing area A to F is input to the selection operation of the total stitch count correction switch SWT. When sewing the work cloth K based on the converted number of stitches (hereinafter referred to as third sewing), each of the programmed sewing areas A to F
When converting the number of stitches data and data on the amount of unevenness into a predetermined ratio based on the total stitch number correction switch SWT, and sewing the work cloth K based on the converted number of stitches and data on the amount of unevenness ( (hereinafter referred to as 4th sewing), and corrects the set-up amount data of each of the programmed sewing areas A to F based on the set-up correction switches SWA to SWF, and adjusts the set stitch number data of each sewing area A to F. When converting the corrected set-up amount data to a predetermined ratio based on the total stitch number correction switch SWT and sew the work cloth K based on the number of stitches and set-up amount data (hereinafter referred to as fifth You can select from 5 types of sewing.

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

In FIG. 5, a microcomputer MC includes a central processing unit (CPU), a read-only memory (ROM), and a readable and writable memory (Random Access).
Memory) consists of RAM and I/O port IOP. Each input terminal of the I/O port IOP has the above and mode select switches MS1 to
MS5, MSS, including set, open area and total number of stitches correction switch SWA~SWF, SWU,
SWT, data select and data input switch
The output terminals of DSS, INS, and start switch 2 are connected, and the output terminal of the I/O port IOP is connected to a sewing machine drive circuit 51 that drives and controls the sewing machine motor MM, and a pulse motor that drives and controls the pulse motor PM. a motor drive circuit 52, a cylinder drive circuit 53 that drives and controls the air cylinder PS;
Each input terminal of a servo motor drive circuit 54 that drives and controls the servo motor SM, the stitch count indicator lamp L1, the offset indicator lamp L2, and a display drive circuit 55 that drives and controls the display device DSP are connected. Further, at the input terminal of the I/O port IOP, there is a needle position detector 56 that detects the needle position of the sewing needle 4 based on the rotation of the sewing machine main shaft 25, etc., and a needle position detector 56 that detects the needle position of the sewing needle 4 based on the rotation of the sewing machine main shaft 25, etc. The output terminal of a stitch number counter 57 that counts the number of stitches is connected.

Meanwhile, the readable and writable memory
For RAM, use the memory select switch MS1~
Based on the operations of MS5, data select switch DSS, and data input switch INS, sewing programs of five sewing patterns for workpiece cloth K are stored in memory, and the data on the amount of unevenness in each sewing area A to F of the sewing program are stored. Each driving rotation speed of the corresponding pulse motor is stored in memory.

Next, a method of using the sewing machine constructed as described above and its operation will be explained with reference to flowcharts of the control program of the microcomputer MC shown in FIGS. 6 to 10.

First, the sewing program (support program)
We will explain how to write the data into the readable and writable memory (hereinafter referred to as memory) RAM of the microcomputer MC.

Now, when the power supply switch (not shown) of the control circuit is pressed, various registers, flags, etc. are reset by the initialization routine 61 in the microcomputer MC. Next, when the operator first switches the mode select switch MSS to the program mode and presses the memory select switch MS1 of the five memory select switches MS1 to MS5, the memory select signal of the memory select switch MS1 is transmitted via data.
SGMS1 is input and stored in the register, and the program signal MSSP of the same mode select switch MSS is input and stored in the register.
Then, the program reaches the program address shown in FIG. 7 through a check routine 62 that determines whether the mode select switch MSS is in the program based on the program signal MSSP1.

When the program address is reached, the central processing unit
Routine 6 for calculating the memory select signal SGMS1 of the memory select switch MS1 using the CPU
3. Store the calculated value in the register and select the memory select switch among the five sewing patterns.
Routine 64 for instructing the address to write the sewing pattern program to memory RAM based on MS1
After passing through, it reaches address P01.

Then, the control program will be described below in order to sequentially store the predetermined number of stitches and sagging amount data for each area A to F, U, and P shown in Table 1 of the attached sheet at a predetermined address in the memory RAM. Routine 65 displays the sewing area in which data will now be input to the display device DSP based on the added contents of the display instruction register (in this case, since the display register is initially cleared, the display of the display device DSP is "A--") and the display drive circuit 5 sends a drive signal to turn on the stitch count indication lamp L1 and turn off the set-stitch indication lamp L2.
A routine 66 outputted in step 5 instructs the operator to input stitch count data for sewing area A. Further, the program moves to address P02, where a routine 67 inputs the set mode select signal MSSP and memory select signal SGMS1, a check routine 68 determines whether or not there is a change in the switching of both selector switches MSS and MS1, and the above data. The loop continues through a check routine 69 for determining whether or not the select switch DSS and the data input switch INS have been operated, that is, whether or not the number of stitches for the sewing area A has been input, and then returning to the routine 67 again.

While continuing to go around this loop, when the operator sets the data select switch DSS to the number of stitches in the sewing area A of the work cloth K and then presses the data input switch INS, the operator exits the loop and selects the same data select switch. A routine 70 stores stitch count data based on the switch DSS at a predetermined address in the memory RAM, and displays the value of the stitch count data on the display device DSP for a predetermined time (for example, if the stitch count is 40, "A40" is displayed) (After a predetermined period of time, the numerical value disappears and becomes "A--") Routine 71
The memory RAM that stores the stitch count data
Store the data for the next sewing area A at the address next to the address (increment command).
A routine 72 is reached. Memory like this
When the stitch count data in sewing area A is stored at a predetermined address in the RAM, a routine 73 that determines whether the value of a display instruction register (to be described later) is 6 (in this case, it is cleared to 0) and the stitch The routine 74 causes the display drive circuit 55 to output a drive signal that turns off the number indicator lamp L1 and turns on the reset indicator lamp L2, and then moves to address P03.

Moving to address P03, routine 7 inputs the mode and memory select signals MSSP and SGMS1.
5. Mode and memory select switches MSS and MS based on the same select signals MSS1 and SGMS1
a check routine 76 for determining whether or not there is a switching change in data selection switch DSS;
Check routine 7 determines whether or not the data input switch INS has been operated, that is, whether or not the data of the offset amount for sewing area A has been input in this case.
7 and then returns to the routine 75 again.

Then, while the loop continues to rotate, the worker moves the data select switch DSS to the sewing area A of the processed fabric K.
When the data input switch INS is pressed, the routine 78 exits from the loop and stores the data of the data in the area A in the memory RAM. Display on the DSP for a predetermined time (for example, if the amount of distortion is 10, it will be displayed as "A10", and after a predetermined time, only the number will disappear and become "A--") Routine 79, increment the memory RAM address After going through the routine 80 and the routine 81 that adds 1 to the display instruction register, the above procedure is repeated.
Return to address P01. Then, based on the value of the display instruction register 81 added in the routine 65, the display device DSP displays sewing area B (displaying "B--") where data will be input next, and the routine At 66, the number of stitches indicator lamp L
1 is turned on, the false instruction lamp 2 is turned off, and the address P02 is reached, and the program repeats a large loop from address P02 → address P03 → address P01 → address P02 until the value of the display instruction register reaches 6. spin.

Then, the operator operates the switches DSS and INS using the same operating procedure as when inputting the number of stitches and the amount of offset data for the sewing area A, and while continuing to go around this large loop, the sewing area is sequentially sewn from sewing area B. As in the case of the sewing area A, the data on the number of stitches and the amount of criss-crossing up to F are sequentially stored at predetermined addresses in the memory RAM.

The number of stitches and the amount of offset data for the sewing area F are stored in the memory RAM, that is, the loop is repeated 6 times.
When the cycle reaches address P01, the display instruction register displays "U--" in the stitching area U where data will be input next to the display device DSP, based on the value added to 6 in the display instruction register in the routine 61. ), and at the same time, in routine 66, the number of stitches display lamp L1 is turned on, and the setting indication lamp L is turned on.
2 is turned off, and then the operation moves on to storing the stitch count data of the sewing area U of the work cloth K in the memory RAM. Then, when the operator sets the data select switch DSS to the stitch count data and presses the data input switch INS to store the data at a predetermined address in the memory RAM, check whether the value of the display instruction register is 6 or not. A routine 73 for determining, a routine 82 for adding 1 to the display instruction register, and a routine 82 for adding 1 to the display instruction register, and the display device DSP based on the value of the display instruction register.
Then, the seam allowance area P for inputting data is displayed (display of "P--") and address P04 is reached.

When address P04 is reached, the control program selects the set mode and memory select signals MSS1,
A routine 84 for inputting SGMS1, and a check routine 85 for determining whether or not there is a switching change in both modes and memory select switches MSS and MS1 based on both select signals MSSP and SGMS1.
Then, the loop continues through which the data select switch DSS and the data input switch INS are operated to determine whether or not the stitch number data for the seam allowance area P has been stored in the memory RAM, and then returns to the routine 84 again.

While continuing to go around this loop, the operator sets the data select switch DSS to the number of stitches in the seam allowance area P of the workpiece cloth K, and then presses the data input switch INS. A routine 87 for storing stitch count data based on the above at a predetermined address in the memory RAM, and a routine 88 for displaying the value of the same stitch count data on the display device DSP for a predetermined period of time in the same manner as above.
After the predetermined time, the program returns to the main address through a routine 89 for clearing the display instruction register, and the operation of writing the sewing pattern program based on the memory select switch MS1 to the predetermined address in the memory RAM is completed.

Similarly, the other four memory select switches MS
By sequentially operating buttons 2 to MS5, sewing patterns based on the respective memory select switches are stored in the memory RAM as shown in Table 1 above.

Therefore, in this embodiment, five sewing pattern programs are stored in the memory RAM.

Then read and write memory as above
Based on the sewing program written to RAM,
The case of performing criss-cross stitching on the work cloth K will be explained.

First, we will explain the case (first sewing) in which the memory select switch MS1 is selected and sewing is performed based on the stitch count data and set-in data according to the program of the sewing program written in the memory RAM by the memory select switch MS1. do.

Now, with memory select switch MS1 pressed, the operator can press the mode select switch.
When the MSS is switched to the first sewing mode and the power supply switch (not shown) of the control circuit is pressed, the mode selection is performed from the initialization routine 61 to the check routine 62 as shown in FIG. Mode select signal output when switch MSS is switched to 1st sewing
The sewing address shown in FIG. 8 is reached through a check routine 90 that determines whether the select switch MSS is present on the monitor based on MSS1.

When the control program reaches the sewing address, the mode select signal MSS1 from the mode select switch MSS and the memory select switch MS1 are activated.
The memory select switch signal SGM1 from
Routine 91 to input both select switches
The loop continues to return to the routine 91 again through a check routine 92 for determining whether the MSS and MS1 have been switched and a check routine 93 for determining whether the start switch 2 has been pressed.

Then, when the operator presses the start switch 2, the loop is exited and the memory select signal is
A routine 95 for storing the calculated memory select signal SGMS1 is reached via a routine 94 for calculating SGMS1, and during this time, the sewing program based on the memory select switch MS1 among the five sewing programs stored in the memory RAM is read out. Next, a routine 96 for inputting the mode select signal MSS1, the mode select signal
Based on MSS1, a check routine 97 determines whether the sewing is the fifth sewing, a check routine 98 similarly determines whether the sewing is the fourth sewing, and a check routine 98 similarly determines whether the sewing is the third sewing. In order to perform the first sewing based on the data of the read sewing program, the first sewing is performed based on the data of the sewing program that has been read out. Routine 101 for creating program data shown in 2 and Routine 10 for storing the data
2 and reaches address S01.

In addition, data on the number of completed stitches in sewing areas A to F
XA to XF, sewing start position stitch count data XU for sewing area U and sewing completion position stitch count data XP for seam allowance area P are as follows: XF=Aa+Ba+Ca+Da+Ea+Fa, XU=Aa+Ba-Ua, XP=Aa+Ba-Ua+Pa, Aa; Stitch number data for sewing area A Ba; Stitch number data for sewing area B Ca; Stitch number data for sewing area C Da; Needles for sewing area D Number data Ea; number of stitches in sewing area E data Fa; number of stitches in sewing area F data Ua; number of stitches in sewing area U data Pa; number of stitches in seam allowance area P data.

Therefore, from now on, the sewing machine 1 is controlled in accordance with the data.

When the control program reaches address S01 as described above, the routine 103 outputs a drive signal to the sewing machine motor drive circuit 51 to drive the sewing machine motor MM based on the start switch 2, as shown in FIG. As soon as the sewing machine motor MM starts driving, data on the amount of creasing in the sewing area A is
Write out YA and use the same data in sewing area A.
In order to drive the pulse motor PM and make the feed amount of the sub-feed dog 7 larger than that of the main feed dog 6 so as to be able to perform skew stitching corresponding to YA, a control signal for driving and controlling the pulse motor PM is sent to the pulse motor. Address S02 is reached through a pulse motor drive subroutine 104, which will be detailed later, which is output to the drive circuit 52, and a routine 105 which increments the data and reads data XA of the number of completed stitches. Therefore,
At the same time as the sewing machine 1 starts driving, criss-cross stitching in the sewing area A on the work cloth K starts.

Then, as the sewing machine motor MM is driven, a routine 106 calculates the number of stitches by counting the stitch count signal from the stitch count counter 57, and compares the completed stitch count data XA of the sewing area A with the number of stitches by the counter 57. check routine 107 for determining whether sewing is completed in sewing area A.
Then, the loop continues, returning to the routine 106 again.

When the sewing of sewing area A is completed, the routine 108 exits from the loop, increments the data, and reads out the offset amount data YB of sewing area B. In the embodiment, as shown in Fig. 2, since the cradling stitching is not performed in the sewing area B, the data YB is based on the pulse motor PM rotated in the normal direction based on the crooked stitching amount data YA. The pulse motor drive subroutine 109 controls the drive of the pulse motor PM based on the value for rotationally returning to the position (i.e., -YA), and the data is incremented to generate the sewing start position stitch number data of the sewing area U.
Address S03 is reached through routine 110 for reading XU.

When the sewing start position stitch number data XU is read out, routine 1 inputs a stitch number count signal from the stitch number counter 57 that counts the number of stitches.
11, and a check routine 1 that compares the sewing start position stitch number data XU with the number of stitches in the counter 57 to determine the start of sewing in the sewing area U portion.
12 and then returns to the routine 111 again.

Then, as the sewing progresses in the sewing area B and eventually starts sewing in the sewing area U, the loop is exited and a control signal is sent to the servo motor drive circuit 54 to stop the rotation of the rotating wheel 12. Routine 11 for outputting a control signal to the cylinder drive circuit 53 to raise the pressure roller 13
3, and a routine 114 that increments the data and reads out the sewing completion position stitch number data XP of the seam allowance area P, and reaches address S04. That is, here, as shown in FIG. 1, when the work cloth K is fed by the main and sub feed dogs 6, 7, etc., the servo is operated until the sewing area U of the work cloth K is fed to the sewing position. The sensor 10 detects the side edge Ka of the work cloth K and presses the pressure roller 1.
3, the work cloth K is pressed and the rotary wheel 12 is controlled to rotate, so that the work cloth K is guided to the regular sewing position. However, when the sewing of the seam area U is started, the seam allowance Kb protruding from the side edge Ka of the work cloth K blocks the reflective plate 11, and the work cloth K is not sent to the normal sewing position. There is a risk that the servo sensor 10 may malfunction even though the However, in this example, the seam allowance
Press roller 13 until Kb completely passes through the sewing position, that is, sewing of seam allowance area P is completed.
Since the rotating wheel 12 is stopped at the same time as the servo sensor 10 is raised, there is no possibility that the work cloth K will be deviated from the normal sewing position due to malfunction of the servo sensor 10.

When the sewing of the stitching area U is started as described above, the routine 115 calculates the number of stitches by counting the stitch count signal from the stitch count counter 57 and the stitch count data of the sewing completion position of the seam allowance area P. After the check routine 116, which compares XP with the number of stitches determined by the counter 57 and determines whether sewing of the seam allowance area P is complete, the routine returns to routine 1.
Continue looping back to 15. When the sewing of the seam allowance area P is completed, the routine 117 exits from the loop, increments the data, and reads data XB of the number of completed stitches of the sewing area B, and the press roller 13 that has been raised. is lowered, and the rotating wheel 12 is rotated based on the detection signal of the servo sensor 10,
Routine 118 for outputting control signals to the air cylinder and servo motor drive circuits 53 and 54 so that the workpiece cloth K is sent to the regular sewing position, respectively.
, and the remaining part of sewing area B is sewn. Then, a loop consisting of a routine 119 for calculating the number of stitches and a check routine 120 for determining whether sewing is completed in sewing area B based on the number of stitches and the completed sewing number data XB is continued.

When the sewing of the sewing area B is completed, the routine 121 exits from the loop and reads out the erging amount data YC of the next sewing area C, and the pulses that control the forward rotation of the pulse motor PM based on the data YC. Motor drive subroutine 12
2, the routine 123 is reached which reads data XC on the number of completed stitches of the next sewing area C. Therefore, as soon as the sewing of the workpiece cloth K is transferred from the sewing area B to the sewing area C, the pulse motor PM is controlled to rotate in the forward direction, and the feed amount of the sub-feed dog 7 is adjusted to correspond to the skewing amount data YC. The adjustment is made, and criss-cross stitching is performed on the work cloth K. A loop consisting of a routine 124 that calculates the number of stitches based on the number of stitches counter 57, and a check routine 125 that determines whether sewing is completed in the sewing area C based on the same number of stitches and the completed sewing number data XC. Continue to rotate.

When the sewing of the sewing area C is completed, the loop is exited, and the data YD of the amount of offset of the next sewing area D (in this embodiment, the offset of the sewing area D is larger than the offset of the sewing area C) Therefore, the routine 126 reads out the erroneous amount data YD (the value that increases by that amount is calculated and set), and based on the data YD, the pulse motor PM is controlled to rotate forward by the amount of increase. After passing through the pulse motor drive subroutine 127, data on the number of completed stitches of the next sewing area D is obtained.
A routine 128 is reached which reads XD. Therefore, when the sewing of the work cloth K moves to the sewing area D, the pulse motor PM is immediately controlled to rotate in the normal direction, and the feed amount of the sub-feed dog 7 is adjusted to correspond to the skewing amount data YD. Irregular stitching is performed on the work cloth K. The stitch number counter 57
The loop continues, consisting of a routine 129 that calculates the number of stitches based on the number of stitches, and a check routine 130 that determines whether sewing is completed in the sewing area D based on the number of stitches and the data XD on the number of completed stitches.

When the sewing of the sewing area D is completed, the loop is exited and the data YE of the amount of edging of the next sewing area E (in this embodiment, the edging of the sewing area E is the same as the edging of the sewing area C) Therefore, the same set amount data YE is calculated and set by subtracting the increased value as is).
After passing through a pulse motor drive subroutine 132 that controls the reverse rotation of the pulse motor PM based on YE, a routine 132 is reached that reads data on the number of completed stitches (XE) of the next sewing area E. Therefore, when the sewing of the workpiece cloth K is moved to the sewing area E, the pulse motor PM is controlled to rotate in the reverse direction, and the feed amount of the sub-feed dog 7 is adjusted to correspond to the skewing amount data YE, and the workpiece cloth is sewn. The criss-cross stitching is performed on K. Then, a routine 134 calculates the number of stitches based on the number of stitches counter 57, and a check routine 13 determines whether sewing is completed in the sewing area E based on the same number of stitches and the completed sewing number data XE.
Continue going through the loop consisting of 5.

When the sewing of the sewing area E is completed, the data exits from the loop and the data YF of the erging amount of the next sewing area E (in this embodiment, the sewing area F
Since the sewing is a normal double chain stitch with no offset stitching, the same offset stitching amount data
YF is calculated and set to a value necessary to rotate the pulse motor PM in the reverse direction so that the feed amount of the sub feed dog 7 is the same as the feed amount of the main feed dog 6); Same data
After passing through a pulse motor drive subroutine 137 for controlling the reverse rotation of the pulse motor PM based on YF, a routine 138 is reached for reading data XF on the number of completed stitches of the next sewing area F. Therefore, processed cloth K
When the sewing moves to sewing area F, the pulse motor
The PM is immediately controlled to reverse rotation, and the initial data is
Corresponding to YF, the feed amount of sub feed dog 7 is changed to main feed dog 6.
The feed amount is adjusted so as to match the feed amount, and normal double chain stitching is performed on the work cloth K. and,
A routine 139 for calculating the number of stitches based on the number of stitches counter 57, the same number of stitches, and the completed number of stitches data
The loop consisting of a check routine 140 that determines the completion of sewing of the sewing area F, that is, the completion of sewing of the work cloth K, based on XF is continued.

When the sewing of the sewing area F is completed, the sewing machine motor MM exits from the loop.
After a routine 141 in which a stop signal for stopping the machine is output to the sewing machine motor drive control circuit 51, one round of sewing on the workpiece cloth K is completed, and the machine returns to the main address again to prepare for sewing the next workpiece cloth K. .

Although this embodiment has described the sewing pattern based on the memory select MS1, even if other memory select switches MS2 to MS5 are selected as appropriate, the data program for each sewing turn stored in the memory RAM shown in Table 1 will not change. On the basis of the,
The data for the first sewing as shown in Table 2 are created in the same manner as described above, and the work cloth can be sewn in the same manner as described above.

Therefore, it is possible to easily and appropriately set the amount of creasing of each sewing part of the work cloth K in advance, so that it is possible to improve the efficiency of the sewing work, and it is easy to use even for non-skilled workers. can.

Next, the pulse motor drive subroutine 104 for driving and controlling the pulse motor PM will be explained based on FIG. 10.

Now, when sewing in the sewing area A is started, the data YA of the amount of creasing in the sewing area A stored in the routine 102 is read out and stored in the register of the microcomputer MC.
Now, the pulse motor PM is in its original position (rotational position of the pulse motor PM when there is no uneven stitching)
If the data value YA of the sewing area A is equal to the feed amount of the sub-feed dog 7 in the sewing area A by normal rotation of 6 steps from It is digitized and memorized. Then, when the sewing machine motor MM is started to be driven by the routine 103, a drive signal is immediately outputted to the pulse motor drive circuit 52 to rotate the pulse motor PM one step in the forward rotation WY, and the drive signal is sent to the register. a routine (not shown) that subtracts the stored data value by 1; a check routine 142 that detects a positive potential detection signal output from the needle position detector 56 when the sewing needle 4 that reciprocates up and down reaches the uppermost position; Based on the detection signal, a loop returns to the check routine 142 through a routine 143 for counting the number of sewing stitches and a check routine 144 for determining whether the number of sewing stitches has reached 3. and,
When the sewing needle 4 has sewn three stitches, the routine exits from the loop and outputs a drive signal to the pulse drive circuit 52 to rotate the pulse motor PM by one step in the forward direction, a routine 146 that subtracts 1 from the data value of the register, and a subtraction routine. The same data value is 0
The loop continues through a check routine 147 for determining whether or not the condition is met, and then returns to the check routine 142 again. And the same step motor PM
is rotated by one step every time the sewing needle 4 sews three stitches, and the rotation is controlled intermittently up to six steps.
Therefore, there is no sudden change in the feed amount of the sub-feed dog 7, so that the sewing portion of the work cloth K can be finished very neatly.

Similarly, each pulse motor drive subroutine 1
09, 122, 127, 132, and 137 also store the skew amount data YB, YC, YD, YE, and YF in the registers, and each time the sewing needle sews three stitches based on the same data values, one step and a pulse are generated. The motor PM is rotated forward or backward, and the rotation is controlled up to a predetermined number of steps as shown in FIG. 11.

Next, for the second sewing, data on the amount of stubble in each sewing area A to F of each sewing program shown in Table 1 stored in the memory RAM is adjusted based on the operation of each of the stub correction switches SWA to SWF. A case where the modified work cloth K is sewn will be described.

Now, the worker is switching the memory select switch MS.
1, and then in order to sew the work cloth K by slightly modifying the data YA to YF of the data YA to YF of the data on the data YA to YF for each sewing area, set the corrections using the data correction switches SWA to SWF. Then, the mode select switch MSS is operated to switch to the second sewing mode. Then, when the start switch 2 is pressed, the control program is activated by the mode select switch 2.
Mode select signal MSS2 output from MSS
Based on the above, as shown in FIG.
Is correction signal SGSWA output from SWF
〜SGSWF The above-described data is processed through a routine 151 for creating a data program shown in Table 3 and a routine 152 for storing the data using the corrected distortion amounts (±△A) to (±△F) calculated based on SGSWF.
Reach address S01. Thereafter, based on the data shown in Table 3, the work cloth K is sewn in the same manner as in the first sewing.

Therefore, each of the above correction switches SWA~
Operate SWF and use mode select switch
By simply switching the MSS to the second sewing mode, each sewing area A to
The work cloth K can be sewn by easily modifying the amount of creasing of F in various ways.

Similarly, other memory select switches MS1~
If MS5 is selected appropriately, the data for the second sewing as shown in Table 3 above is created in the same manner as described above, based on the data program of each sewing pattern stored in the memory RAM shown in Table 1 above. , the work cloth can be sewn in the same manner as described above.

Next, for the third sewing, the stitch number data of each sewing area A to F of each sewing program shown in Table 1 stored in the memory RAM is adjusted to a predetermined ratio based on the operation of the total stitch number correction switch SWT. A case will be described in which the number of stitches is converted and the work cloth K is sewn based on the converted number of stitches.

Now, the worker is switching the memory select switch MS.
Press 1 and then enter the stitch count data for each sewing area A to F.
Aa~Fa, that is, each sewing completed stitch number data XA~
In order to convert XF into a predetermined ratio and sew work cloth K, the ratio is changed to the total correction switch SWT.
and then press the mode select switch.
Switch MSS to 3rd sewing. When the start switch 2 is pressed, the control program changes the data of the sewing program shown in Table 1 from the check routine 99 as shown in FIG. 8 based on the mode select signal MSS3 output from the mode select switch MSS. , the ratio (=1±
V/100, V: the value set by the total correction switch SWT), the program passes through a routine 153 for creating a data program shown in Table 4 and a routine 154 for storing the data, and then reaches the address S01.

Thereafter, based on the data shown in Table 4, the first
The work cloth K is sewn in the same way as in the case of sewing.

Therefore, operate the total correction switch SWT and set the mode select switch MSS to the third position.
By simply switching to sewing, you can easily modify the number of stitches in each sewing area A to F of the sewing program for a preset workpiece cloth K, so even workpiece cloths of different sizes can be easily modified. Can be easily sewn.

Similarly, other memory select switches MS2~
If MS5 is selected appropriately, the data for the third sewing is created in the same manner as above as shown in Table 4 based on the data program of each sewing pattern, and the work cloth is sewn in the same way as above. Can be sewn.

Next, for the fourth sewing, the stitch number data and crimp amount data of each sewing area A to F of each sewing program are transferred to the total stitch number correction switch SWT.
The processed cloth K is converted into a predetermined ratio based on the operation of
The case of sewing will be explained.

Now, as in the case of the third sewing, the operator operates the memory select switch MS1 and the total number of stitches correction switch SWT, and then switches the mode select switch MSS to the fourth sewing. When start switch 2 is pressed, the mode select signal is output from the mode select switch MSS.
Based on MSS4, as shown in FIG.
Total correction signal SGSWT output from AWT
The ratio calculated based on (=1±V/100,
V: the value set by the total stitch number correction switch SWT), the routine 155 for creating the data program shown in Table 5 and the routine 156 for storing the data are passed, and the address S01 is reached.

Therefore, by simply operating the total correction switch SWT and switching the mode select switch MSS to the fourth sewing mode, the number of stitches in each sewing area A to F of the sewing program for a preset work cloth K can be changed. Since the amount of creasing can be adjusted relatively easily, it is possible to easily sew fabrics of different sizes.Moreover, since the amount of creasing is adjusted relative to the number of stitches at this time, the size If the size of the predetermined work cloth K changes to a greater extent than the size of the predetermined work cloth K, the work cloth can be sewn without becoming too uneven or becoming too tight, unlike in the case of the third sewing. .

Next, for the fifth sewing, the data on the amount of set-up in each sewing area A to F of each sewing program is corrected based on the operation of the set-up correction switches SWA to SWF, and the data on the number of stitches in the areas A to F are corrected. A case will be described in which the corrected skew amount data are converted into a predetermined ratio based on the total correction switch SWT, and the work cloth K is sewn based on the converted data.

Now, the worker operates the memory select switch MS1 and each set correction switch SWA to SWF as in the case of the second sewing, and also operates the total stitch number correction switch SWT as in the case of the third sewing. Said mode select switch SWT
and then press the mode select switch.
Switch MSS to 5th stitch. Then, when the start switch 2 is pressed, the mode select switch output from the mode select switch MSS
Mode select signal MSS4 output from MSS
Based on the sewing program shown in Table 1 from the check routine 97 as shown in FIG.
Corrected amount of distortion (±△A) to (±△F) calculated based on the distortion correction signals SGSWA to AGSWF from the distortion correction switches SWA to SWF
and the ratio calculated based on the total correction signal SGSWT from the total number of stitches correction switch SWT (=1±V/100, V; the value set by the total number of stitches correction switch SWT), the data shown in Table 6 is obtained. After passing through a routine 157 for creating a program and a routine 158 for storing its data,
Reach address S01.

Therefore, the correction switches SWA to SWF,
By simply operating the total stitch count correction switch SWT and mode select switch MSS, the second
It is possible to sew a work cloth whose size is significantly different from the work cloth set by sewing with the same effect as in the fourth sewing.

In this way, set the sewing program for the standard work cloth K, and turn the mode select switch.
If you select any one of the 1st to 5th sewing as appropriate in MSS, you can sew a workpiece cloth of a different size from the standard workpiece cloth K, or create a workpiece cloth with a different amount of creasing in each sewing area A~F. Sewing can be done easily.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and the sewing pattern may be increased or decreased by increasing or decreasing the memory select switch, or the operation of only one of the rotating wheel 12 and the pressing roller 13 may be controlled. , it is also possible to make appropriate changes without departing from the spirit of the invention.

[Effects of the Invention] As described in detail above, the present invention allows the amount of set-up currently being sewn to match the newly commanded set-up amount based on the set-up amount data commanded as sewing progresses. Since it is configured to gradually increase or decrease the amount of setting stitches for each predetermined number of stitches,
This has the advantage that stitching can be beautifully performed between a normal sewing part in which the offset stitching is not performed and the offset sewing part, or a part where the offset stitching amount changes in the offset sewing part.

[Brief explanation of drawings]

Fig. 1 is a front view of a processed cloth for explaining this invention, Fig. 2 is a front view of a processed fabric similarly sewn with uneven stitches, Fig. 3 is a perspective view of a sewing machine embodying this invention, and Fig. 4 is a front view of a processed cloth for explaining this invention. The figure is a perspective view of the main parts showing the feed mechanism for the work cloth, Figure 5 is the electric block circuit diagram for controlling the sewing machine, Figures 6 to 10 are flowcharts of the microcomputer, and Figure 11 is the same. FIG. 3 is an explanatory diagram showing changes in the amount of creasing in each sewing area of the work cloth. In the figure, 1 is a sewing machine, 2 is a start switch, 4 is a sewing needle, 6 is a main feed dog, 7 is a sub feed dog, 10 is a servo sensor, 11 is a reflector, 12 is a rotating wheel, 13 is a pressure roller, and 21 is a The main feed stand, 22 is the sub feed stand,
25 is the main shaft of the sewing machine, 26 is an eccentric cam for vertical feeding,
28 is an eccentric cam for forward and backward feeding, 30 is a swing shaft, 31
33 is a swing arm, 33 is a feed arm, 36 is an adjustment shaft, 37 is an adjustment lever, 38 is an adjustment link, 39 is a sliding separator, 42 is a link, 51 is a sewing machine motor drive circuit, 52 is a pulse motor drive circuit, 53 54 is a cylinder drive circuit, 54 is a servo motor drive circuit, and 55 is a cylinder drive circuit.
is a display drive circuit, 56 is a needle position detection circuit, 57 is a stitch number counter, K is a processed cloth, A to F are sewing areas, U is a sewing area, P is a seam allowance area,
SM is servo motor, PM is pulse motor, MM
is the sewing machine motor, MS1 to MS5 are the memory select switches, MSS is the mode select switch,
MC is a microcomputer, SWA~SEF is a set correction switch, SWT is a total stitch number correction switch, DSS is a data selection switch, INS
is the data input switch, DSP is the display device, L1
is a stitch count indication lamp, and L2 is a set-up indication lamp.

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Claims (1)

[Scope of Claims] 1. A first cloth feeding means, a second cloth feeding means, and a cloth feeding means connected to at least one of the first cloth feeding means and the second cloth feeding means, and a cloth feeding means of one cloth feeding means. In a sewing machine equipped with a drive means that increases or decreases the amount of serration by changing the amount of cloth feeding relative to the amount of cloth fed by the other cloth feeding means, data on the amount of erging that is commanded as sewing progresses Based on the above, the present invention further includes a control means for controlling the driving means to gradually increase or decrease the amount of setting stitches every predetermined number of stitches so that the amount of setting stitches currently being sewn becomes the newly commanded setting amount. Featured sewing machine.