KR20060063681A - Up and down sewing machine - Google Patents

Abstract

The subject of this invention is sewing corresponding to the thickness change of cloth.

To this end, in the present invention, the cloth thickness detecting means 50 for detecting the thickness of the object to be sealed, and the storage means 84 for storing the cloth thickness for switching the parameter amount and sewing section for sewing in each of a plurality of sewing sections. And operation control means 80 for switching the sewing section whenever the thickness of the sewing section is detected by the cloth thickness detecting means and controlling the operation of the control object to sew with the parameter amount corresponding to each sewing section. Equipped.

Description

Up and down sewing machine {UPWARD AND DOWNWARD FEEDING SEWING MACHINE}

1 is a perspective view showing a differential feed sewing machine which is an embodiment of the invention.

Figure 2 is an enlarged perspective view showing the configuration around the sewing needle.

3 is a block diagram showing a control system of the differential feed sewing machine.

4 is a display example of a display screen showing the contents of sewing data.

5 is a table showing the contents of setting parameters in sewing data.

Fig. 6 is a diagram showing the relationship between the change of the detected cloth thickness and the switching conditions based on the set cloth thickness when sewing thick articles.

7 is a flowchart showing a sewing operation of the differential feed sewing machine based on the control of the operation control means.

8 is an enlarged perspective view showing the configuration around the sewing needle in the case of adding the thread relaxation mechanism.

* Explanation of symbols for the main parts of the drawings *

10: differential feed sewing machine 11: sewing needle

15: needle plate 17: operation panel

18: sewing machine motor 19: thread tension solenoid

30: upper rotation transfer unit 50: cloth thickness detection means

55: thread loosening member 61a, 61b: upper feed motor

65: thread tension control device 70: lower rotational transfer unit

75: lower feed motor 80: motion control means

84: EEPROM (memory means)

The present invention relates to a vertical transfer sewing machine provided with cloth thickness detecting means for detecting the thickness of a sewing object to be sewn.

In the conventional up and down conveying sewing machine, the upper conveying device for conveying the upper fabric and the lower conveying device for conveying the lower fabric, the upper conveying device and the lower conveying device of the case of sewing the sleeve to the fabric corresponding to the body portion, etc. The difference in each conveyance amount was made, so-called "groove stitching".

In this sewing machine, sewing is performed by dividing the step of sewing the sleeve into a plurality of sewing sections, setting the groove reduction amount individually for each sewing section, and switching the groove reduction amounts in order during sewing (patent document) 1).

In the above-described conventional example, the sewing sections and the order of shanghai for each sewing section are set in advance, and correspond to a manual switching instruction input or in response to the needle count set for each sewing section. The transition to the next Shanghai seams was either manually or automatically.

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2003-135873 (FIGS. 5 and 6)

By the way, in the case of sewing a thick sewing material by a sewing machine, for example, when padding is sewn over a lower fabric and an upper fabric, a large change occurs in the thickness of the fabric with the progress of the sewing. In this case, it is necessary to change and adjust various parameters such as the groove shrinkage (the amount of shank of the cloth) or the tension of the yarn.

However, in the conventional sewing machine described above, since the sewing section is switched manually or in accordance with the set number of needles, there is a problem that it is impossible to switch various parameters according to the fabric thickness as described above.

An object of the present invention is to enable sewing while adjusting the amount of shanghai according to the detected thickness of the fabric.

The invention according to claim 1 is a vertical conveying sewing machine comprising a lower conveying device for conveying a lower fabric and an upper conveying device for conveying an upper fabric, the fabric thickness detecting means for detecting a thickness of a to-be-sealed material on a needle plate, and at the time of sewing. The storage means for storing the parameter amount concerning sewing for each of several sewing sections to be switched, and the thickness of the to-be-processed object which switches a sewing section, and the thickness of the to-be-processed object which switches each said sewing section by cloth thickness detection means are detected. And a control unit for controlling the operation of the control target to be driven by the parameter amount so as to switch between the sewing sections each time and to sew with the parameter amount according to each sewing section.

Here, in the case of simply referred to as "sewn material", the entirety of a plurality of items to be superimposed for sewing is assumed.

In the above configuration, one sewing step is divided into a plurality of sewing sections, and the parameter amount is sequentially stored in the storage means for each sewing section. The storage means also stores a predetermined cloth thickness for reading the parameter amount corresponding to the next sewing section.

That is, each time the sewing thickness is detected by the cloth thickness detecting means at the time of sewing, and the cloth thickness for switching each sewing section is detected, the operation control means switches the sewing section sequentially, With respect to the means for the sewing operation to be controlled, it is controlled to drive according to the parameter amount set in the newly switched sewing section.

The invention described in claim 2 has the same configuration as the invention described in claim 1, and the parameter amount determines the difference between the transport amount of the upper to-be-sealed product and the transport amount of the lower to-be-sealed product when sewing is superimposed on the needle plate. It is a groove reduction amount, and the control object has a structure which is an upper conveying apparatus which conveys an upper to-be-sealed | blocked object, and a lower conveying apparatus which conveys a lower to-be-sealed material.

That is, each time the thickness of the to-be-sealed object is detected by the cloth thickness detecting means at the time of sewing, and each time the cloth thickness for switching each sewing section is detected, the operation control means moves upward so that the groove reduction amount set in the sewing section is sequentially. Controls the feed rate of the device and the lower feeder.

Invention of Claim 3 has the structure similar to invention of Claim 1, and a parameter amount is the tension of the thread which shows the resistance force given to the sewing thread which is unwound from a thread supply source to a sewing needle at the time of sewing, and is controlled The silver has a structure that is a thread tension adjusting device that imparts resistance to the sewing thread released from the thread supply source to the sewing needle at the time of sewing.

That is, whenever the thickness of the to-be-sealed object is detected by the cloth thickness detecting means at the time of sewing, and the cloth thickness for switching each sewing section is detected, the operation control means sequentially makes the thread tension set to the thread tension set in the sewing section. The control device controls the resistance given to the sewing thread.

The invention described in claim 4 has the same configuration as the invention described in claim 1, and the parameter amount is a thread loosening amount of the sewing thread released from the sewing needle to the object to be sewn during sewing. It has a configuration that is a thread relaxation mechanism that relaxes the thread length of the sewing thread to be sewn.

That is, whenever the thickness of the object to be sewn is detected by the cloth thickness detecting means at the time of sewing and the cloth thickness for switching each sewing section is detected, the operation control means sequentially relaxes the thread so that the thread relaxation amount set in the sewing section is sequentially. Controls the thread relaxation action by the mechanism.

(Overall Configuration of Embodiments)

An embodiment of the present invention will be described with reference to FIGS. The differential conveying sewing machine 10 according to the present embodiment is a sewing machine for sewing while reducing the grooves by making a difference in the respective feed speeds of the upper and lower fabrics to be sewn, for example, a sleeve and a body (the main body of clothes). It is used to insert and sew a pad when sewing a wide and large width.

In addition, 'shrink groove' refers to the difference in the pitch width of the sewing between the upper fabric and the lower fabric, by increasing the difference (the groove reduction) can be given elasticity when sewing is completed. Therefore, when sewing a sleeve and a length, by making the groove reduction amount of the shoulder side sewing part larger than the armpit side, the shoulder side to which elasticity is calculated | required after sewing can be afforded.

In the following description, the direction in which the sewing needle 11 moves up and down is orthogonal to the Y axis direction (up and down direction) and the Y axis direction, and the direction parallel to the conveying direction of the object to be sealed is the X axis direction (front and rear direction). , The directions orthogonal to both the Y-axis direction and the X-axis direction are defined as Z-axis directions (left and right directions), respectively. In addition, the mounting surface 15a of the needle board 15 mentioned later shall be arrange | positioned in parallel with an X-Z plane.

1 is an overall perspective view of a differential feed sewing machine 10. The differential feed sewing machine 10 is a cloth placing portion 13 having a needle plate 15 formed with a mounting surface 15a for placing and sewing a sewing object made up of upper and lower fabrics and pads, and a mounting surface 15a. ) And a needle lifting means (not shown) for driving the sewing needle 11 in an up and down direction, and being supported on the upper side of the mounting surface 15a. At the same time, the presser foot 12 having the penetrating portion of the sewing needle 11 and the presser foot 12 are disposed adjacent to each other, and the upper rotary feeder 30 for transferring the upper fabric on the mounting surface 15a and the mounting surface 15a. The lower rotation conveying unit 70 for conveying the upper fabric of the upper, the upper conveying motors 61a and 61b for imparting the driving force of the conveying operation to the upper rotating conveying unit 30, and the lower rotating conveying unit 70 Lower presser motor 12 and the presser foot 12 and the upper side in synchronization with the shanghai east of the sewing needle 11 and the lower transfer motor to give a driving force At the same time, the transfer transfer unit 30 alternately moves to Shanghai, and among them, the sewing needle 11 for shandong means for moving together with the sewing needle 11 with respect to the presser foot 12, and the upper thread released from the thread supply. The thread tension adjusting device 65 for applying tension by applying a resistance to the loosening at the front of the cloth, the cloth thickness detecting means 50 for detecting the thickness of the object to be sealed on the needle plate 15, and the operation of the respective parts. An operation control means 80 for controlling is provided.

In addition, the upper rotary feeder 30 and the upper feed motors 61a and 61b function as the upper feeder, while the lower rotary feeder 70 and the lower feeder 75 serve as the lower feeder. .

(Sewing needle)

2 is an enlarged perspective view showing the peripheral configuration of the sewing needle (11). The sewing needle 11 is reciprocated along the Y-axis direction by the needle lifting means supported by the body frame, not shown. The sewing needle 11 has an upper thread through which the illustration is omitted in the vicinity of the tip end thereof, and penetrates the sewing material on the mounting surface 15a of the needle plate 15 by a reciprocating motion in the Y-axis direction. Transfer the upper thread to the lower side of the garment, and sew it on the lower thread which the kiln (not shown) loosens.

(Needle lifting means)

The needle lifting means maintains the sewing needle 11 at its lower end, and is fixed to the needle frame 23 reciprocally supported along the Y-axis direction and fixed to the main body frame, near the upper end and the lower end of the needle bar 23. The upper and lower sleeves (not shown) and the lower sleeve 25 and the sewing machine motor 18 (refer to FIG. 3) which respectively support the slides so as to be slidable, and at the same time the main frame of the main body is parallel to the Z axis direction. A main drive shaft (not shown) rotatably supported on the shaft, and a crank mechanism (not shown) for converting the rotational driving force of the main drive shaft into a reciprocating drive force along the Y-axis direction and transmitting it to the needle bar 23. .

(Presser foot)

The presser foot 12 has an overall L-shape in its overall shape, and is held on the presser foot holding shaft 49 of the shank moving means described later at the upper end of the portion corresponding to the L-shaped longitudinal rod. Therefore, the presser foot 12 continuously moves up and down during sewing, and presses the upper fabric and the lower fabric toward the needle plate 15 side every time the reciprocating is performed, and presses the fabric.

(Upward rotation transfer part)

As shown in FIG. 2, the upper rotation transfer unit 30 includes a first upper transfer unit 31 and a second upper transfer unit 32 which are disposed adjacent to each other along the Z axis direction with the presser foot 12 interposed therebetween. ) And a connecting member 39 for connecting them. Since the 1st and 2nd upper conveyance parts 31 and 32 are supported by the conveyance part holding shaft 48 of the shanghai moving means in the state connected by the connection member 39, when moving up and down by shanghai moving means, To exercise.

The first upper transfer part 31 includes a first upper belt driven by the upper transfer motor 61a, and the first upper belt 31 is positioned above the mounting surface 15a of the needle plate 15. It conveys along the X-axis direction. The first upper belt is brought into contact with the to-be-sealed material on the mounting surface 15a of the needle plate 15, and transfers upward.

The second upper transfer part 32 includes a second upper belt driven and driven by the upper transfer motor 61b, and the second upper belt 32 is disposed above the mounting surface 15a of the needle plate 15. It conveys along the X-axis direction. The second upper belt is brought into contact with the to-be-sealed material on the mounting surface 15a of the needle plate 15, and transfers upward.

In the upper rotary feed unit 30, since the first and second upper feed units 31 and 32 are arranged on both sides with the needle position therebetween, the effect of the sewing thread 11 on the upper feed of the object to be sealed. By suppressing this, stable conveyance in the desired conveying direction becomes possible.

(Up and down movement means)

The shank moving means maintains the lower end of the upper rotary feed unit 30, and at the same time maintains the lower end of the feeder holding shaft 48 and the presser foot 12 for supporting the shank movement with respect to the sewing machine frame. The rotational driving force of the presser foot holding shaft 49 and the sewing machine motor 18 to be reciprocatedly oscillating driving force, while maintaining the conveying portion holding shaft 48 and the presser foot by the reciprocating oscillating driving force. The transmission mechanism which rotates each shaft 49 alternately is provided. The shank moving means is configured to move the presser foot 12 and the upper rotation transfer part 30 alternately in synchronism with the rotation of the sewing machine motor 18. In addition, the shangdong means, the lowering of the sewing needle (11) and the lowering of the presser foot (12) is performed at about the same time, and the upper rotation transfer unit 30 is adjusted in phase so as to descend upon the rising of the sewing needle (11) have.

(Cloth placement)

The cloth placing part 13 is provided with the mounting base 14 installed in the lower side of the sewing needle 11, and the needle board 15 fixedly mounted on the upper surface of the mounting base 14. As shown in FIG. At the top of the mounting table 14, inside the cover, a kiln mechanism and a lower rotary feed unit 70 described later are stored.

The needle plate 15 is a plate-shaped member elongated in the conveying direction of the cloth, and in the state fixed on the mounting table 14, a placing surface 15a, which is a flat surface parallel to the XZ plane, is formed in the middle of the longitudinal direction. It is. In addition, the upstream side of the fabric conveyance direction upstream from the placing surface 15a is provided with an upstream side conveying surface for conveying the cloth having a slight downward gradient toward the upstream side, and is downstream from the mounting surface 15a in the conveying direction. The side is provided with the downstream side conveying surface which conveys the cloth which has a slight fall | descent gradient as it goes to the said downstream side.

In the center of the mounting surface 15a of the needle plate 15, a rectangular lower transfer opening 15b formed through the needle plate 15 is formed. The upper surface of the belt guide 71 and the first and second lower belts 72 and 73 of the lower rotary transfer part 70 described later are exposed from the lower transfer opening 15b. Therefore, the cloth placed on the mounting surface 15a is brought into contact with the respective lower belts 72 and 73 exposed from the lower transfer opening 15b and conveyed in the conveying direction.

(Lower rotation feeder)

The lower rotary transfer part 70 is a belt guide 71 provided on the upper side of the kiln mechanism supported on the upper part of the mounting table 14 described above, and the first lower transfer part conveyed to the lower transfer motor 75. A 1st lower belt 72 and the 2nd lower belt 73 as a 2nd lower conveyance part are provided.

The belt guide 71 has two guide grooves formed on the upper surface thereof in the X-axis direction, and the sewing needle 11 is located between the guide grooves and at the position just below the sewing needle 11 until the kiln of the kiln mechanism. The needle hole for guiding) is formed. This needle hole is for sewing by passing the lower thread released by the kiln to the round ring portion of the upper thread to be sent at the time of insertion of the sewing needle (11).

(Thread tension control device)

The thread tension adjusting device 65 provides tension to the thread by closing the gap between the thread tension solenoid 19 and the thread tension solenoid 19 to generate a thrust according to the amount of current supplied, and sandwiching the upper thread therebetween. A pair of thread tension adjusting trays is provided.

The thread tension solenoid 19 is connected to the power control means 80 via the drive circuit 87, and the drive circuit 87 is actually tensioned with a current value corresponding to the control signal output from the motion control means 80. By energizing the solenoid 19, arbitrary thrust is output, and arbitrary tension is given to the upper thread.

(Cloth thickness detecting means)

The cloth thickness detecting means 50 detects an angle of detecting the swinging angle of the detection arm 51 and the detection arm 51 whose tip is in contact with the object to be sewn on the needle plate 15 from the upper side in the vicinity of the presser foot 12. A potentiometer 52, which is a means, is provided. The potentiometer 52 is disposed below the tip of the sewing machine arm portion.

The potentiometer 52 has a rotatable detection shaft, and has a function of outputting a signal corresponding to the rotation angle generated on the detection shaft to the operation control means 80, and the detection arm 51 by the detection shaft. ), The base end of the shaft is supported.

The detection arm 51 has its base end supported by the detection axis of the potentiometer 52, and its tip end is arranged obliquely downward while being in a direction orthogonal to the detection axis. The tip end of the detection arm 51 is landed at a position adjacent to the Z-axis direction of the presser foot 12 on the upper surface of the needle plate 15, and the sewing material set on the upper surface of the needle plate 15 during sewing. It is arranged to abut on the water. Therefore, during sewing, the detection arm 51 is rotated according to the thickness of the object to be sealed, and the detection axis of the potentiometer 52 at the base end side outputs a signal to the operation control means 80 by the rotation angle according to the thickness. The operation control means 80 calculates the thickness of the object to be sealed from the detection rotation angle and the known length of the detection arm 51.

(Configuration of the motion control means)

The operation control means 80 will be described with reference to FIG. 3. 3 is a block diagram showing a control system of the differential feed sewing machine 10. First, the configuration around the operation control means 80 is as follows.

The operation panel 17 shown in FIG. 3 is an input / output device having display means for displaying a predetermined image and a touch panel provided on the display screen. On the display screen, various sewing information or various setting buttons output from the operation control means 80 are displayed, and the touch panel senses an input operation for various display switches, and coordinates of an input instruction position by a touch operation. The information is output to the operation control means 80. The operation control means 80 stores individual data at each predetermined position of the display area corresponding to the image data being outputted, and when the position coordinates of the respective positions and the input instruction position coincide, By reading the data, it can be recognized that the data is selected.

The step change switch 92 shown in FIG. 3 is a switch for sequentially switching the sections (steps) to be the input setting targets when the operator sets the home reduction amount for a plurality of sections formed by dividing the sewing range. to be. By the input circuit 90 provided in the step switching switch 92, a signal corresponding to the operation contents of the switch 92 is input to the operation control means 80.

The sewing machine starting pedal 91 is ON-OFF input means for instructing and inputting the starting of the sewing machine motor 18 by the stepping operation. By the input circuit 89 provided in parallel with the sewing machine starting pedal 91, a signal corresponding to the operation of the sewing machine starting pedal 91 is input to the operation control means 80.

The potentiometer 52 described above outputs a detection signal to the operation control means 80 via the input circuit 93.

Each of the transfer motors 61a, 61b, 75 described above is driven by the rotation angle corresponding to the control signal of the operation control means 80 by the drive circuits 85a, 85b, 86, respectively.

In addition, the sewing machine motor 18 is a servo motor, and the drive control is performed by the drive circuit 88 by the amount of rotation corresponding to the control signal of the operation control means 80. In addition, since the rotation amount can be controlled by the angle unit, the operation control means 80 can recognize the current rotation angle position of the sewing machine motor 18.

The operation control means 80 includes a ROM 82 in which control programs, control data or various sewing data for executing various functions and operations described later of the differential feed sewing machine 10 are recorded, and according to the control program, the first and Controlling the operation of each part such as the second upper feed motor 61a, 61b, the lower feed motor 75, the thread tension solenoid 19 and the sewing machine motor 18, and simultaneously generate display data to generate display data. An MPU 81, which is a microcomputer to be displayed on the display unit 17, a RAM 83 for storing processing data of the MPU 81, various data relating to a home reduction amount setting process and a home reduction sewing process, in a work area; An EEPROM 84 for recording and holding the process data stored in the RAM 83 is provided.

The RAM 83 is provided with various working memories, counters, and the like, and is also used as a work area during sewing operations.

(Sewing data)

The EEPROM 84 also stores sewing data in which various parameters for home reduction sewing are set.

Fig. 4 is a display example of a display screen showing the content of sewing data, and Fig. 5 is a chart showing the setting contents. In the sewing data, a plurality of ordered sewing sections are set, and in each sewing section, parameters such as pitch amount, groove shrinkage amount, thread tension, cloth thickness, number of needles, and the like for each section are set. In addition, various parameters can be newly set from the operation panel or overwritten (overwritten).

4 and 5, examples of sewing data in which five sewing sections are set are shown. That is, in the display example of FIG. 4, the annular display area in the center of the screen is divided into circular arcs having a length corresponding to the set number of needles for each section to display each sewing section, and the set home reduction amount for each section is displayed inside. Is indicated.

As described above, the sewing section is switched during sewing. Then, by the control at the time of sewing, the driving amount of the lower feed motor 75 per needle is determined according to the pitch amount set in the current sewing section, and every one needle from the pitch amount and the groove reduction amount per section. The driving amounts of the upper transfer motors 61a and 61b are determined, and the driving current of the thread tension solenoid 19 is determined from the tension of the thread for each section, and sewing is performed. Further, when the sewing section is switched, each actuator such as the lower feed motor 75 is controlled by the new pitch amount or the like.

In sewing, the sewing section is switched by three methods. That is, (1) when sewing is made by the number of needles set in each sewing section, the process automatically shifts to the next sewing section, and (2) when the above-described step change switch 92 is input during sewing, the process shifts to the next sewing section. And (3) when the cloth thickness detected by the cloth thickness detecting means 50 reaches the cloth thickness set in each sewing section, the process shifts to the next sewing section. In the method of (1) to (3), any one is selectively set in advance before sewing, (1) and (2), (2) and (3), (1) and (3), (1) ( It is also possible to select a combination of 2) and (3), respectively.

(Operation control by operation control means)

Next, operation control executed by the CPU 81 of the operation control means 80 will be described.

The CPU 81 reads the parameters of the current section from the sewing data by executing a predetermined processing program at the time of sewing, and according to each parameter amount, the motors 85a, 85b, 86 and the actual tension solenoid 19 Is controlled to be a predetermined driving amount or output.

If the sewing section is set to switch to the number of needles in advance, the CPU 81 executes a predetermined processing program at the time of sewing, thereby reading the set number of needles in the corresponding section and starting from the start of the section. The number of needles is counted, and when the count reaches the set number of needles, control is shifted to the next sewing section.

The CPU 81 monitors the input of the step change switch 92 during sewing by executing a predetermined processing program at the time of sewing when the sewing section is set to be switched to the input of the step change switch 92 in advance. When an input is detected, control is shifted to the next sewing section.

If the sewing section is set to change the sewing section according to the thickness value of the fabric in advance, the CPU 81 detects the output of the potentiometer 52 during sewing and executes a predetermined processing program at the time of sewing, thereby Performs a process of calculating. In addition, the CPU 81 compares the fabric thickness set in the current sewing section with the calculated fabric thickness, and executes control for shifting to the next sewing section when the switching condition based on the set fabric thickness is satisfied.

Fig. 6 is a diagram showing the relationship between the change of the detected cloth thickness and the switching conditions based on the set cloth thickness when sewing the thick to-be-sealed material. The thickness of the to-be-sealed material gradually increases in the sewing progress direction, and tends to decrease gradually beyond the maximum value. For such a to-be-sealed material, switching conditions based on the respective set cloth thicknesses A to E are set as shown in FIG. 5.

That is, in the rising gradient section, the condition is to exceed this for the set cloth thickness of A, B, C, and in the falling gradient section, the condition is less than the setting cloth thickness of the D, E.

In this way, the set cloth thickness value and the switching condition are determined according to the change in the cloth thickness of the to-be-sealed sewing object, and incorporated into the sewing data.

(Operation explanation of the sewing machine)

7 is a flowchart showing the sewing operation of the differential feed sewing machine 10 based on the control of the operation control means 80. The sewing operation of the differential feed sewing machine 10 is demonstrated based on the same figure.

In the description of this operation, the case of sewing by simultaneously selecting a mode for switching the sewing section by the number of needles, a mode for switching by the input of the step switching switch 92 and a mode for switching the sewing section at the detection of the set cloth thickness at the same time is taken as an example. It is explained.

First, it is determined whether or not the front press of the sewing machine starting pedal 91 has been executed, and if not, the input standby state is entered (step S1: NO). In addition, when the sewing machine starting pedal 91 is pressed (step S1: YES), driving of the sewing machine motor 18 is started (step S2). Accordingly, drive control of each of the motors 61a, 61b, 75 and the thread tension adjusting device 65 is started in accordance with each parameter set in the first sewing section.

When the sewing machine motor 18 starts to rotate, the parallel encoder detects the current rotation angle of the sewing machine motor 18 and determines whether one rotation has been completed. If one rotation is not completed, detection is repeated until one rotation is completed (step S3: NO). If it is determined that the sewing machine motor 18 has finished one rotation (step S3: YES), the RAM 83 1 is added to the needle count counter in the step (step S4).

In addition, it is determined whether the count value of the needle counter has reached the number of needles in the section set in the current sewing section, and when it is reached, the process proceeds to step S8 (step S5: YES).

On the other hand, when the count value of the needle counter does not reach the number of needles in the section set in the current sewing section (step S6: NO), the cloth thickness is calculated from the output of the potentiometer 52. Then, it is determined whether the detected cloth thickness satisfies the condition to be switched to the next sewing section (step S6). If the condition is satisfied, the process proceeds to step S8 (step S6: YES).

If the detected cloth thickness does not satisfy the condition for switching to the next sewing section (step S6: NO), it is determined whether the step changeover switch 92 is input, and if an input is detected, the process proceeds to step S8. (Step S7: YES). If no input is detected, the flow returns to step S3 to detect the rotation speed of the sewing machine motor 18 again (step S7: NO).

In step S8, it is determined whether or not the current sewing section (step) is a final section. When the final sewing section (step S8: YES), the drive of the sewing machine motor 18 is stopped and sewing is finished.

If it is not yet the final section (step S8: NO), the step is switched to the next sewing section (step S9), the needle count counter is cleared, and the process returns to step S3.

(Effect of Embodiment)

In the differential feed sewing machine 10, the sewing sections are sequentially switched in accordance with the detected cloth thickness of the sewing object, and the control target is controlled based on the parameter amounts such as the pitch width, the groove shrinkage, the thread tension, etc. set in each sewing section. Since the upper feed motors 61a and 61b or the lower feed motor 75 are controlled, an appropriate groove reduction amount or thread tension is selected according to the change in the thickness of the cloth to be produced, so that even when sewing a thick cloth It becomes possible, and can improve the sewing quality.

(Etc)

To the differential feed motor 10, a thread relaxation mechanism for loosening the thread length of the upper thread as the sewing thread to be sewn may be added. The thread relaxation mechanism includes a thread relaxation member 55 that reciprocates across the vertical movement path in synchronization with the shanghai movement of the sewing needle 11, and the upper thread extends from the needle drop position of the sewing object to the next needle drop position. The upper thread can be relaxed as much as the bypass path by bypassing with the thread loosening member.

In addition, when providing a thread relaxation mechanism, as shown in FIG. 8, the presser foot 12 becomes the arrangement | position shifted from the needle drop position.

The thread loosening member 55 is supported so that reciprocation is possible along the Z-axis direction and the Y-axis direction, and is provided with the stepping motor which moves a thread loosening member in each direction.

The thread loosening member 55 executes the thread relaxation operation by driving the stepping motor in the Z axis direction, and the thread relaxation amount is defined by the driving amount in the Y axis direction. That is, the frequency of thread relaxation is determined by the driving of the stepping motor in the Z-axis direction, and the amount of thread relaxation is determined by the driving amount of the stepping motor in the Y-axis direction.

Therefore, the stepping motor in the Z-axis direction is driven at a rate of once every few needles, or the stepping motor driving amount in the Y-axis direction for adjusting the thread loosening amount is set as a parameter for each sewing section of the sewing data.

Then, the amount of thread loosening is controlled for each sewing section, and sewing is performed.

In this way, by adding the thread relaxation mechanism, the thread relaxation mechanism can be controlled based on the thread relaxation amount set in each sewing section, and sewing is performed at an appropriate thread relaxation amount in accordance with the change in the thickness of the cloth to be produced. Even when sewing a thick cloth it is possible to ensure the exact amount of thread loosening, it is possible to further improve the sewing quality.

The invention described in Claims 1 and 5 switches the sewing sections in sequence according to the detected cloth thickness of the sewing object, and controls the means to be controlled based on the parameter amount set in each sewing section, thereby producing the cloth to be produced. Since the control regarding sewing is made according to the change of thickness, accurate sewing is possible even when sewing thick cloth, and sewing quality can be improved.

In addition, when a plurality of parameter amounts are set for each sewing section to control a plurality of control objects, a series of working means related to sewing of the sewing machine can be driven at an appropriate driving amount according to the change in the thickness of the cloth. do.

In the invention according to claim 2, since the upper feeder and the lower feeder are controlled on the basis of the amount of grooves set in each sewing section, sewing is performed at an appropriate amount of grooves in accordance with the change in the thickness of the cloth to be produced. Even when sewing thick fabrics, it is possible to sew precise grooves, further improving the quality of sewing.

In the invention according to claim 3, the sewing is performed at an appropriate thread tension in accordance with the change in the thickness of the cloth to be produced by controlling the thread tension adjusting device based on the thread tension set in each sewing section. Even with the correct thread tension, sewing is possible, and the sewing quality can be further improved.

In the invention according to claim 4, the sewing is performed at an appropriate amount of thread loosening according to the change in the thickness of the cloth to be produced by controlling the thread loosening mechanism based on the thread loosening amount set in each sewing section. Accurate thread loosening can be ensured even at the time of sewing, further improving the sewing quality.

The invention according to claim 6 switches the parameters of the sewing section when there is a change in the predetermined thickness of the fabric prior to the count of the number of stitches of the set section. Etc. are possible.

Claims (6)

Fabric thickness detecting means for detecting the thickness of the fabric on the needle plate; Storage means for storing a parameter amount set for each of a plurality of ordered sewing sections and a thickness of the cloth for switching the sewing sections; Whenever the cloth thickness for detecting each sewing section is detected by the cloth thickness detecting means, the sewing section is switched and at the same time, the operation of the control target driven by the parameter amount is controlled to sew with the parameter amount according to each sewing section. Up and down conveying sewing machine comprising a motion control means for. The method of claim 1, The parameter amount is a groove reduction amount that determines the difference between the transfer amount of the upper and lower objects to be conveyed when the sewing is superimposed on the needle plate, The control target is an upper and lower conveying machine, characterized in that the upper conveying device for conveying the upper to-be-sealed material and the lower conveying device for transporting the lower to-be-sealed material. The method of claim 1, The parameter amount is the tension of the thread representing the resistance given to the sewing thread released from the thread supply source to the sewing needle at the time of sewing, The control object is a vertical tension sewing machine characterized in that the thread tension adjusting device for imparting resistance to the sewing thread released from the thread supply source to the sewing needle during sewing. The method of claim 1, The parameter amount is the thread loosening amount of the sewing thread released from the sewing needle to the object to be sewn and released during sewing, The control object is a vertical transfer sewing machine, characterized in that the thread relaxation mechanism for relaxing the thread length of the sewing thread to be sewn. The method of claim 1, And said operation control means executes the control for shifting to the next sewing section based on the comparison between the fabric thickness set in the sewing section and the calculated fabric thickness. The method of claim 1, The storage means stores the number of section stitches for each sewing section, The operation storage means includes a needle counter for counting the number of needles in the sewing section, and a needle count counter for switching to the next sewing section when the needle count counter counts the number of needles in the sewing section, and before the counting of the number of needles in the section. And the cloth thickness detecting means controls to switch to the next sewing section when the cloth thickness for switching each sewing section is detected.

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