JP2006230891A - Differential feeding sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a differential feeding sewing machine, which can easily adjust sewing length for making predetermined shirring. <P>SOLUTION: A differential feeding sewing machine 1 makes sewing operation for predetermined amount of shirring of the sewing length which is set for each sewing step according to sewing pattern data including the shirring amount data and the sewing length data which are memorized in ROM10b or EEPROM10d, and also changes the sewing operation so as to start the shirring stitch in the following step when it finishes the shirring stitch of the sewing length which is set for the sewing step beforehand, especially, the differential feeding sewing machine 1 has a function to temporarily stop the change of sewing operation from the previous sewing step to the following sewing step. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a differential feed sewing machine that performs false sewing with different feed amounts of an upper cloth and a lower cloth.

2. Description of the Related Art Conventionally, a differential feed sewing machine that performs sewing while performing shirring (contraction) when performing sleeve fitting or the like is known.
Note that “inking” means, for example, an outer fabric (upper fabric, sleeve-side fabric) that is sewn in two layers when sewing a three-dimensional portion such as a shoulder of a sleeve of a clothes. ) Is made larger than the feed amount of the inner fabric (the lower fabric, the fabric on the body side), so that the outer fabric has a margin. By this intrusion, a predetermined three-dimensional shape is applied to the shoulders of the sleeves of the clothes. In addition, the squeeze is not necessarily applied uniformly over the entire series of sewing parts. It is common to sew with a reduced amount. In addition, the “weighing amount” indicates a difference in the feed amount between the upper cloth and the lower cloth per one stitch (first stitch, one pitch).

  As a differential feed sewing machine that performs such sleeve attachment, one round of the sleeve around the shoulder is divided into a plurality of sewing steps such as a sleeve crest portion and a sleeve bottom portion, and various sewing conditions ( It is known to set a feed amount (feed pitch, sewing pitch), squeeze amount, sewing step length, etc.) and store and register it as a single sewing pattern data (see Patent Document 1). Then, by selecting desired sewing pattern data from a plurality of stored sewing pattern data, the differential feed sewing machine performs a sewing operation based on the selected sewing pattern data.

In this sewing operation of the differential feed sewing machine, the sewing operation based on the sewing amount set in the sewing step in the selected sewing pattern is performed, and the sewing for the sewing step length set in each sewing step is performed. The automatic switching mode that automatically switches to the next sewing step as soon as the sewing is completed and the sewing sewing based on the sewing amount set in the sewing step in the selected sewing pattern is performed, but between the sewing steps There is a manual switching mode in which switching is performed by operating a predetermined switch or the like. The automatic switching mode and the manual switching mode can be selectively used according to the characteristics of the sewing product or the operator's preference.
JP 2004-141224 A

However, in the case of the above-mentioned Patent Document 1, during the sewing operation in the automatic switching mode of the differential feed sewing machine, the sewing according to the amount of squeezing in the sewing step is preset according to the state of the sewing object. Even if an attempt is made to execute the sewing step longer than the sewing step length, when the sewing for the predetermined sewing step length is completed, the sewing machine is switched to the next sewing step. It was difficult to cope with sewing while adjusting the length of the sewing step so as to correct a dimensional error due to the expansion / contraction characteristics of the workpiece.
Therefore, in such a case, the automatic switching mode is switched to the manual switching mode and sewing is performed to correct the dimensional error. However, for one or two sewing steps that need to be corrected, the work is performed. The person has to manually switch all the sewing steps, and there is a problem that the work efficiency deteriorates due to an increase in complicated operations.

In addition, when the differential feed sewing machine is performing sewing of a large amount of the same type of workpiece based on predetermined sewing pattern data in the automatic switching mode, the number of sewing steps in the sewing pattern data and each sewing step There is a case where the set value of the squeeze amount is the same and the sewing of the sewing product partially different in size may be interrupted, but the sewing step length varies depending on the size of the sewing product. Therefore, in the automatic switching mode that automatically switches to the next sewing step based on the sewing step length, sewing is performed while adjusting the sewing step length so as to correct dimensional errors due to partial size differences. It was difficult to do.
Therefore, in such a case, the automatic switching mode is switched to the manual switching mode, and sew-in stitches with different sewing step lengths are performed on partially different sizes of the sewing product. For one or two items to be sewn, the operator must temporarily switch to the manual switching mode and return to the automatic switching mode, which increases complicated operations. As a result, there is a problem that work efficiency deteriorates.

  An object of the present invention is to provide a differential feed sewing machine capable of easily adjusting a sewing length for performing predetermined shampooing.

  In order to solve the above-described problems, the invention described in claim 1 includes squeeze amount data relating to a squeeze amount set for each of a plurality of sewing steps and sewing length data relating to a sewing length in the sewing step. A storage means for storing sewing pattern data, a sewing means for performing a sewing operation of sew-on stitches composed of a plurality of sewing steps based on the sewing pattern data stored in the storage means, and a sewing means set for each sewing step Sewing step switching control means for switching the sewing operation of the sewing means so as to start the sewing sewing in the next sewing step based on the completion of the sewing sewing of the sewing length that has been set. The sewing step switching control is performed so that the sewing operation by the sewing means is not switched to the sewing operation relating to the next sewing step. Characterized in that it comprises a step switch stop means for temporarily stopping the switching of the sewing operation of the sewing unit by means.

  According to the first aspect of the present invention, the differential feed sewing machine has a pre-set squeeze amount corresponding to the sewing length set for each sewing step based on the sewing pattern data stored in the storage means. The sewing operation is switched so that the sewing operation in the next sewing step is started when the sewing operation for the sewing step is performed and the sewing length of the sewing length set in advance for the sewing step is finished. The differential feed sewing machine has a function of temporarily stopping the switching of the sewing operation from the previous sewing step to the next sewing step.

  The invention according to claim 2 is the differential feed sewing machine according to claim 1, wherein the sewing length that the sewing means performs the sewing operation at each sewing step is set to the sewing step. Sewing length subtracting means for subtracting from the sewing length and calculating the remaining sewing length, and the sewing step switching control means is based on the fact that the remaining sewing length calculated by the sewing length subtracting means becomes a predetermined value. The sewing operation is switched so that the sewing means starts the false stitching in the next sewing step, and the step switching stop means switches the sewing step by stopping the process of calculating the remaining sewing length by the sewing length subtraction means. The switching of the sewing operation of the sewing means by the control means is temporarily stopped.

According to the second aspect of the invention, the differential feed sewing machine has the same function as that of the first aspect of the invention and the sewing length formed by performing the sewing operation in each sewing step. Can be subtracted from the set sewing length, and the remaining sewing length to be sewn after that can be calculated.
Then, the differential feed sewing machine switches the sewing operation so as to start the staking sewing in the next sewing step based on the calculated remaining sewing length having reached a predetermined value (for example, the remaining 0 mm). It has become.
The differential feed sewing machine stops the process of calculating the remaining sewing length so as to prevent the remaining sewing length from reaching the predetermined value, so that the sewing operation to the next sewing step can be performed. Switching is temporarily stopped.

  According to a third aspect of the present invention, in the differential feed sewing machine according to the first or second aspect, the step switching stop means is a sewing step switching control means based on the fact that predetermined operation switches are alternately switched on / off. The switching of the sewing operation of the sewing means by the stop and the release of the stop are alternately switched.

  According to the invention described in claim 3, while having the same effect as that of the invention described in claim 1 or 2, the differential feed sewing machine is based on the fact that predetermined operation switches are alternately switched on and off. It is possible to alternately switch between temporarily stopping the sewing operation from being switched to the next sewing step and releasing the temporary stop so that the sewing operation can be switched to the next sewing step. .

According to the first aspect of the present invention, the differential feed sewing machine has a pre-set squeeze amount corresponding to the sewing length set for each sewing step based on the sewing pattern data stored in the storage means. The sewing operation is switched so that the sewing operation in the next sewing step is started after the sewing operation of the sewing step is performed and the sewing length of the sewing length set in advance for the sewing step is finished. . The differential feed sewing machine has a function of temporarily stopping the switching of the sewing operation from the previous sewing step to the next sewing step.
In other words, the differential feed sewing machine temporarily stops the sewing operation from being automatically switched to the next sewing step when sewing for the sewing length set in the sewing step is completed. Therefore, even after the sewing for the sewing length set in advance in the sewing step is finished, the sewing of the amount of sewing set in the sewing step can be performed.
Therefore, the differential feed sewing machine temporarily corrects the sewing length so that it is longer than the sewing step length set in advance in the sewing step and is based on the urging amount set in the sewing step. It is possible to perform multi-purpose sewing.
Therefore, the differential feed sewing machine can easily adjust the sewing length for performing the sew sewing of a predetermined squeeze amount.

According to the second aspect of the present invention, the differential feed sewing machine calculates the effective sewing length formed by actually performing the sewing operation at each sewing step from the set sewing length set for the sewing step. By subtracting, the remaining sewing length to be post-sewn can be calculated.
Then, the differential feed sewing machine switches the sewing operation so as to start the staking sewing in the next sewing step based on the calculated remaining sewing length having reached a predetermined value (for example, the remaining 0 mm). It has become. The differential feed sewing machine stops the process of calculating the remaining sewing length so as to prevent the remaining sewing length from reaching the predetermined value, so that the sewing operation to the next sewing step can be performed. Switching is temporarily stopped.
In other words, the differential feed sewing machine subtracts the execution sewing length formed by actually performing the sewing operation at each sewing step from the set sewing length set for the sewing step, thereby remaining sewing length. Based on the fact that the remaining sewing length has reached a predetermined value (for example, the remaining 0 mm), the sewing operation is switched so as to start the false sewing in the next sewing step. By stopping the process of calculating the sewing length, the remaining sewing length is prevented from reaching a predetermined value, and the switching of the sewing operation to the next sewing step is temporarily stopped.
As described above, the sewing operation is switched to the next sewing step based on the sewing length to be sewn (remaining sewing length), so that the timing for switching the sewing operation can be easily set. This makes it easier to temporarily switch the sewing operation. Then, the temporary stop of the sewing operation switching is performed by not calculating the remaining sewing length to be sewn, so that the predetermined value of the remaining sewing length that is the timing of the sewing operation switching cannot be obtained. Easy to do.

According to the invention of claim 3, the differential feed sewing machine temporarily stops the sewing operation from being switched to the next sewing step based on the on / off switching of the predetermined operation switch. It is possible to alternately switch between releasing the temporary stop and switching the sewing operation to the next sewing step.
Therefore, the differential feed sewing machine temporarily stops switching the sewing operation from the previous sewing step to the next sewing step and automatically switches the sewing operation from the previous sewing step to the next sewing step. Can be easily switched.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
A differential feed sewing machine 1 according to the present embodiment is a sewing machine that performs sewing while performing squeezing by providing a difference in the respective feed amounts of an upper cloth and a lower cloth to be sewn. For example, a body as a lower cloth It is used for sewing, etc., in which a sleeve fabric as an upper fabric is sewed into the fabric.
Here, a direction in which a sewing needle 131 described later moves up and down is a Y-axis direction (up-and-down direction), and one direction orthogonal thereto is an X-axis direction (front-and-rear direction), and both the Y-axis direction and the X-axis direction are A direction orthogonal to the Z-axis direction (left-right direction) is defined.

(Embodiment 1)
As shown in FIGS. 1 and 2, the differential feed sewing machine 1 includes an upper feed mechanism unit 3 that feeds an upper cloth with a predetermined feed amount, a lower feed mechanism unit 4 that feeds a lower cloth with a predetermined feed amount, and a predetermined feed amount. The needle movement mechanism 5 and the like for sewing the upper cloth and the lower cloth respectively fed by the feed amount of.
The upper feed mechanism 3, the lower feed mechanism 4, and the needle movement mechanism 5 constitute a sewing drive unit 2 as sewing means for the differential feed sewing machine 1.

The upper feed mechanism unit 3 includes an upper feed motor 11 (to be described later), and an upper feed belt 110 that is driven by the rotational motion of the upper feed motor 11 being transmitted via a pulley (not shown). Then, according to the driving of the upper feed belt 110, the upper cloth is fed in the direction of the arrow A along the X-axis direction in FIG.
The lower feed mechanism unit 4 includes a lower feed motor 12 (to be described later), a lower feed belt 120 that is driven by the rotational movement of the lower feed motor 12 being transmitted via a pulley (not shown), and the like. Then, as the lower feed belt 120 is driven, the lower cloth is fed in the direction of the arrow A along the X-axis direction in FIG.
The needle movement mechanism unit 5 includes a sewing machine motor 13 to be described later, a needle bar 130 that moves up and down according to the rotational drive of the sewing machine motor 13, a sewing needle 131 that is detachably attached to the needle bar 130, and the like. Then, the upper cloth and the lower cloth are stitched together by a sewing thread (not shown) supplied via the sewing needle 131 or the like.

  Further, as shown in FIGS. 3 and 4, the differential feed sewing machine 1 is a drive that sends an upper feed motor 11 that drives the upper feed belt 110 and a drive control signal from the control unit 10 described later to the upper feed motor 11. A circuit 11a, a lower feed motor 12 that drives the lower feed belt 120, a drive circuit 12a that sends a drive control signal to the lower feed motor 12 from the control unit 10 to be described later, a sewing machine motor 13 that drives the needle bar 130, and A drive circuit 13a for sending a drive control signal from the control unit 10 described later to the sewing machine motor 13, a yarn tension solenoid 14 for applying tension to a sewing thread (not shown), and a drive control signal from the control unit 10 described later for the yarn tension solenoid 14 Drive circuit 14a, a sewing machine starting pedal 15 for operating the differential feed sewing machine 1, and driving based on the operation of the sewing machine starting pedal 15 An input circuit 15a for sending a force signal to the control unit 10 to be described later, an auxiliary pedal 17 for operating the differential feed sewing machine 1, and an input for sending a drive input signal based on the operation of the auxiliary pedal 17 to the control unit 10 to be described later A circuit 17a, a step changeover switch 18 for operating the differential feed sewing machine 1, an input circuit 18a for sending a drive input signal based on the operation of the step changeover switch 18 to the control unit 10 to be described later, various setting switches, etc. An operation panel 16 including a display device to be displayed and a touch panel that detects a position signal based on coordinates of various setting switches that are instructed to be touched, and a control unit 10 that performs operation / processing control of each of the above-described configurations. .

The upper feed motor 11 is driven and controlled based on a drive control signal sent from the control unit 10 (MPU 10a), which will be described later, via the drive circuit 11a based on the operation of the sewing machine starting pedal 15. The upper feed motor 11 drives the upper feed belt 110 that feeds the upper cloth based on the drive control. Further, the lower feed motor 12 is driven and controlled based on a drive control signal sent from the control unit 10 (MPU 10a), which will be described later, via the drive circuit 12a based on the operation of the sewing machine starting pedal 15. The lower feed motor 12 drives the lower feed belt 120 that feeds the lower cloth based on the drive control.
As described above, the upper and lower cloths are fed by the predetermined feed amounts by the upper feed belt 110 and the lower feed belt 120, and sewing is performed. Here, the upper cloth can be squeezed by sewing by making the upper cloth feed amount larger than the lower cloth feed amount. In other words, the amount of urging can be adjusted by changing the difference in the amount of feeding between the upper and lower fabrics, and the amount of urging can be increased as the amount of feeding of the upper fabric is made larger than the amount of feeding of the lower fabric. it can.

  The sewing machine motor 13 rotates a sewing machine main shaft (not shown) based on a drive control signal sent from the control unit 10 (MPU 10a), which will be described later, via the drive circuit 13a based on the operation of the sewing machine starting pedal 15. The sewing machine main shaft is connected to the needle bar 130 via a conversion mechanism that converts rotational motion into reciprocating motion. When the sewing machine main shaft is rotated by the sewing machine motor 13, the needle bar 130 reciprocates, and along with the movement of the needle bar 130, the sewing needle 131 provided at the tip of the needle bar 130 reciprocates to move the sewing product ( Drive the needle to sew the upper and lower cloth.

  The thread tension solenoid 14 is a drive source of a thread nipping section (not shown) that sandwiches the thread and applies tension to the thread, and receives a drive control signal sent from the control section 10 (MPU 10a), which will be described later, via the drive circuit 14a. By operating based on this, a predetermined amount of tension is applied to the yarn held by the yarn holding portion.

  The sewing machine activation pedal 15 is an operation pedal for an operator to operate the differential feed sewing machine 1. The sewing machine activation pedal 15 gives commands such as start, drive speed, and stop according to the operator's pedal depression operation and depression amount via an input circuit 15a that converts the movement of the activation pedal 15 into an electrical signal. It outputs to the control part 10 (MPU10a) mentioned later as a drive input signal, and drives the differential feed sewing machine 1. FIG.

The auxiliary pedal 17 is a pedal portion for the operator to change the setting value of the wiping amount data regarding the wiping amount in the differential feed sewing machine 1. The auxiliary pedal 17 is an instruction to change the set value of the amount of urging data according to the depression operation of the operator and the depression amount via the input circuit 17a that converts the movement of the operation of the auxiliary pedal 17 into an electric signal. Is output as a drive input signal to the control unit 10 (MPU 10a), which will be described later, to change the setting value of the amount of squeeze data in the differential feed sewing machine 1.
The auxiliary pedal 17 is provided so as to be swingable about a predetermined axis. Then, the auxiliary pedal 17 outputs a positive change amount of the change amount to the control unit 10 by swinging by the front step and a negative change amount of the change amount of the negative value by the swing by the rear stepping. . In addition, since the technique regarding the change of the amount of squeezing with the auxiliary pedal 17 is a conventionally well-known technique, it is not explained in full detail here.

  The step changeover switch 18 is a switch for the operator to switch a sewing step of sewing pattern data, which will be described later, in the differential feed sewing machine 1, and the operator can operate with the knee. The step changeover switch 18 uses the input circuit 18a that converts the operation of the changeover switch 18 into an electric signal, and controls the step changeover command, which will be described later, as a drive input signal corresponding to the operation of the changeover switch 18 by the operator. Output to the section 10 (MPU 10a), and the sewing step of the sewing pattern data in the differential feed sewing machine 1 is switched to the next sewing step.

The operation panel 16 includes a display device such as an LCD as a display unit and a touch panel as an input unit provided on the surface of the display device.
The display device outputs various pieces of sewing information (for example, sewing pitch amount (upper feed amount, lower feed amount) relating to sewing pattern data), thread tension (thread tension), and each sewing step output from the control unit 10 (MPU 10a) described later. The display amount (section graphic) indicating the sewing amount, the sewing length, the sewing step, etc., and various switches (setting switch, input switch, operation switch) etc. are displayed.
The touch panel detects coordinates instructed by a touch reading principle such as an electromagnetic induction type, a magnetostriction type, or a pressure sensitive type, and outputs the detected coordinates to the control unit 10 (MPU 10a) described later as a position signal.

That is, the operation panel 16 displays various information, data, and the like, and associates the position information of various switches displayed on the display device of the operation panel 16 with the position information of the coordinates detected by the touch instruction on the touch panel. The inputted input instruction is output to the control unit 10 described later.
For example, on the operation panel 16, an upper feed amount for feeding the upper cloth, a lower feed amount for feeding the lower cloth, and an upper feed amount for the lower feed amount as set values of a desired sewing pattern via a set value input key (not shown). The data relating to the squeeze amount which is the differential amount of the sewing, the sewing length in each sewing step, and the like are input. The input various data, various set values, etc. are output to the control unit 10 and stored in the later-described EEPROM 10d as sewing pattern data.
In addition, on the operation panel 16, an input instruction for selecting sewing pattern data corresponding to a desired sewing pattern is performed via a sewing pattern selection input key (not shown). In response to an input instruction made so that the selection input key is pressed, a selection signal (pressing signal) corresponding to the selection input key is output to the control unit 10. Based on the selection signal, the control unit 10 specifies and selects desired sewing pattern data from a plurality of sewing pattern data stored in the ROM 10b and the EEPROM 10d.
Further, on the operation panel 16, a sewing drive unit 2 (sewing means) by a control unit 10 as a sewing step switching control means described later is provided via an automatic mode release key 40 which is a predetermined operation switch shown in FIG. 5 described later. An input instruction for switching between stopping the sewing operation and releasing the stop is issued. An operation signal (press signal) corresponding to the automatic mode cancel key 40 is output to the control unit 10 in accordance with an input instruction made so that the automatic mode cancel key 40 is pressed. Based on the operation signal, whether or not to execute the control processing of the control unit 10 as the sewing step switching control means is switched.
In this manner, various input data and input instructions input via the operation panel 16 are output to the control unit 10 described later.

  The control unit 10 includes an MPU (Micro Processor Unit) 10a, a ROM (Read Only Memory) 10b, a RAM (Random Access Memory) 10c, and an EEPROM (Electrically Erasable and Programmable ROM) 10d. The differential feed sewing machine 1 is disposed in the electrical box 20.

  The MPU 10a is configured to control each part of the sewing machine according to various control programs for the differential feed sewing machine stored in the ROM 10b in accordance with the drive input signal inputted from the sewing machine starting pedal 15 and various signals and data inputted from the operation panel 16. The operation is centrally controlled, and the processing result is stored in a work area in the RAM 10c, and each part of the sewing machine is operated, and display data is generated and displayed on the operation panel 16 (display device thereof). Then, the processing result stored in the RAM 10c is stored in the EEPROM 10d. As described above, the MPU 10a has a function of controlling the display of the operation panel 16 (display device thereof) as well as a function of controlling driving of various actuators constituting the differential feed sewing machine 1.

In the ROM 10b, a control program and control data for the differential feed sewing machine 1 and data relating to various types of sewing are written and stored. In particular, the ROM 10b has a plurality of squeeze amount data relating to the squeeze amount and sew length data relating to the sew length in the sew step for performing the sew stitch set for each of the plurality of sew steps as storage means. Sewing pattern data is stored.
The RAM 10c is provided with various work memories, counters, etc., and is used as a work area during the sewing operation. The RAM 10c is used as a sewing pattern data selection process, a display process related to the sewing pattern data, and various data related to the false sewing process. It is temporarily stored in the RAM 10c.

  The EEPROM 10d stores various sewing condition setting values (for example, a sewing pitch amount, a feed amount, a sewing length, an urging amount, a thread tension, etc.) set corresponding to the sewing step. In particular, the EEPROM 10d serves as storage means, and is input through the operation panel 16, and is used to perform sew sewing set for each of a plurality of sewing steps. A plurality of sewing pattern data including sewing length data relating to the length is stored.

Here, the sewing pattern data means the sewing data for operating the sewing drive unit 2 as the sewing means, the image data of the display figure corresponding to the sewing pattern data, and the pattern specifying data for specifying the sewing pattern data. It is data comprised by the above.
The sewing data is numerical data relating to sewing necessary for performing the sewage sewing such as the upper feed amount for feeding the upper fabric, the lower feed amount for feeding the lower fabric, the squeeze amount, the sewing length, and the thread tension.
The image data is data related to a display graphic that is displayed in the approximate center of the display screen of the operation panel 16 shown in FIG. In FIG. 5 in the present embodiment, a display graphic 30 is configured by eight section graphics 31 to 38 corresponding to eight sewing steps (sewing sections).
The pattern specifying data is data for specifying desired sewing pattern data from among a plurality of sewing pattern data, and includes a sewing pattern data number and pattern name data corresponding to the specified sewing pattern data.

The display screen of the operation panel 16 shown in FIG. 5 is, for example, a sewing screen on the operation panel 16 that displays the sewing pattern data whose sewing pattern data number is “01”. A display graphic 30 simulating a sleeve shape is displayed, and in the present embodiment, the display graphic 30 is configured by eight section graphics 31 to 38 corresponding to eight regions (sewing step, sewing section). By showing eight section figures, it can be seen that there are eight sewing steps in the sewing pattern data.
Further, the sewing screen of the operation panel 16 shown in FIG. 5 is provided with an automatic mode release key 40 that is a predetermined operation switch and a sewing length display column 41.

The display graphic 30 (section graphics 31 to 38) corresponds to the bottom of the sleeve and the top of the display graphic 30 to the top of the sleeve, and the length of the section graphics 31 to 38 in the circumferential direction is the sewing of each sewing step (sewing section). It is displayed at a ratio according to the length (sewing allowance length).
Sewing is started from the bottom, and the section graphics are displayed in order from the section graphics 31 to the section graphics 38 so as to correspond to the respective sewing steps in the sewing area of the sewing product in a counterclockwise direction. The state is shown in which the squeeze amount data is set to “8, 4, 12, 18, 15, 5, 2, 1” from the corresponding section graphic 31 to the section graphic 38. Note that the squeeze amount displayed on the display graphic 30 is based on the squeeze amount data of the sewing pattern data stored in the ROM 10b or the EEPROM 10d, and the ratio corresponding to the sewing length of each sewing step is the ROM 10b. And the sewing length data of the sewing pattern data stored in the EEPROM 10d.
The amount of squeeze is the excess of the upper feed amount relative to the lower feed amount, that is, the difference (differential amount) between the upper feed amount and the lower feed amount. For example, the upper fabric feed amount and the lower fabric feed amount When the difference is 0.1 mm, the amount of intrusion is displayed as “1” on the screen of the operation panel 16. That is, when the upper feed amount is 2.2 mm and the lower feed amount is 2.0 mm, and 0.2 mm is set to be inserted, “2” is displayed in the section graphic on the operation panel 16.

The automatic mode cancel key 40 is used when performing staking sewing based on the squeezing amount set in each sewing step in the selected sewing pattern, and is equivalent to the sewing step length set in each sewing step. The sewing drive unit 2 is configured to temporarily stop the automatic switching of the sewing step during the sewing operation in the automatic switching mode in which the sewing is automatically switched to the next sewing step upon completion of the sewing. It functions as a part of step switching stop means for switching the sewing operation of (sewing means).
That is, when the automatic mode release key 40 is pressed and switched to “ON” during the sewing operation in the automatic switching mode in which switching is performed so as to automatically shift to the next sewing step, step switching stop means described later As a result of the operation control by the control unit 10, the automatic switching of the sewing step is temporarily stopped so that the sewing operation by the sewing driving unit 2 is not switched to the sewing operation related to the next sewing step. Then, the sewing step length is longer than the sewing step length set for the sewing step, and the sewing sewing based on the sewing amount set for the sewing step can be performed.
Each time the automatic mode release key 40 is pressed, the automatic mode release key 40 is alternately turned on / off. When the automatic mode release key 40 is in the “on” state, the automatic mode release key 40 is turned on. When the automatic mode release key 40 is pressed when the automatic mode release key 40 is pressed when the automatic mode release key 40 is in the “off” state, the screen is switched to the “on” state.
When the automatic mode release key 40 is in the “off” state, the automatic switching mode is set, and the automatic switching of the sewing step during the sewing operation in the automatic switching mode is executed. Become.
On the display screen of the operation panel 16, when the automatic mode release key 40 is in the “on” state, the key is depressed so that it can be visually recognized that the automatic mode release key 40 is pressed. On the other hand, when the automatic mode release key 40 is in the “off” state, white (light color) is displayed as if the key is protruding. .

  The sewing length display field 41 displays the sewing length at the sewing step currently being sewn. For example, in the sewing length display field 41 on the display screen of the operation panel 16 shown in FIG. 5, the sewing length “100 · 0 mm” set in the sewing step corresponding to the section graphic 31 currently being sewn is displayed. The sewing length in the sewing step is displayed so as to show a state where the sewing for “20.0 mm” has been performed.

And the control part 10 is based on the sewing pattern data memorize | stored in ROM10b or EEPROM10d according to the input of the drive input signal accompanying operation of the sewing machine starting pedal 15, and is the upper feed amount in the sewing pattern data. The upper feed mechanism 11 that controls the upper feed motor 11 is controlled so that the upper cloth is fed by the upper feed belt 110. Further, control is performed on the lower feed mechanism unit 4 that drives the lower feed motor 12 so that the lower cloth is fed by the lower feed belt 120 with the lower feed amount in the sewing pattern data. In addition, control related to the needle movement mechanism 5 that drives the sewing machine motor 13 so as to move the needle bar 130 up and down is performed in synchronization with the upper feed control and the lower feed control.
Then, the control unit 10 performs overall control of each mechanism unit, and performs sewing control for controlling the sewing drive unit 2 in order to perform sewing (particularly, squeeze sewing) based on desired sewing pattern data.
In performing the sewing, the desired sewing pattern data depends on the pattern specifying data such as the sewing pattern data number and the pattern name data inputted when the input key (not shown) as the sewing pattern selection input means is operated. Thus, it is specified and selected from a plurality of sewing pattern data stored in the ROM 10b and the EEPROM 10d.

  Further, the control unit 10 performs thread trimming control for performing thread trimming of the sewing thread by a thread trimming mechanism unit (not shown) in response to an input of a drive input signal when the sewing machine starting pedal 15 is operated by being depressed in reverse. .

  Further, the control unit 10 performs control to change the set value of the squeeze amount data in the sewing pattern data based on the swing amount swinged by operating the auxiliary pedal 17. Along with the change of the amount of wiping amount data regarding the amount of wiping, each part of the sewing machine executes sewing regarding the amount of wiping amount to be changed.

  Further, the control unit 10 performs control to switch the sewing step in the sewing pattern data being sewn to the next step based on the drive input signal that is generated when the step changeover switch 18 is operated. Along with the switching of the sewing step, each part of the sewing machine performs sewing related to the switched sewing step.

In the automatic switching mode, the control unit 10 automatically switches from the previous step to the next step in accordance with the end of sewing for the sewing length in the sewing step registered in the sewing pattern data being sewn. Functions as step switching control means.
That is, the control unit 10 serving as the sewing step switching control means performs the urging in the next sewing step based on the fact that the sewing driving unit 2 has finished the sewage sewing of the sewing length set for each sewing step. It functions to switch the sewing operation of the sewing drive unit 2 so as to start sewing. Specifically, the differential feed sewing machine 1 is squeezed for the set sewing length based on the sewing length data and squeeze amount data set for the sewing step in the previous sewing step. When the amount of spigot sewing is completed, the control unit 10 as the sewing step switching control means automatically switches the sewing step, and the differential feed sewing machine 1 is set for the sewing step in the next sewing step. The sewing operation of the sewing drive unit 2 is switched so as to execute the sew-in sewing with the sew-in amount corresponding to the set sew- ing length based on the sewing length data and the squeeze amount data.

Further, the control unit 10 performs the sewing operation of the sewing drive unit 2 by the control unit 10 as the sewing step switching control means based on the automatic mode release key 40 being switched so as to be in the “on” state. It functions as a part of step switching stop means for temporarily stopping switching.
That is, when the automatic mode release key 40 is in the “on” state based on a press signal that is generated when the automatic mode release key 40 is pressed, the control unit 10 as the step switching stop means performs the sewing drive unit 2. In order to prevent the sewing operation from being switched to the sewing operation related to the next sewing step, there is a function of temporarily stopping the switching of the sewing operation of the sewing drive unit 2 by the control unit 10 as the sewing step switching control means.
Then, the automatic switching of the sewing step is temporarily stopped by the operation control of the control unit 10 as the step switching stop means so that the sewing operation by the sewing driving unit 2 is not switched to the sewing operation related to the next sewing step. By doing this, it is possible to perform the sew-on stitches based on the squeeze amount set in the sewing step which is longer than the sewing step length set in advance in the sewing step.

Further, the control unit 10 functions as an on / off determination unit that determines whether the automatic mode release key 40 is in an “on” state or an “off” state.
Then, the control unit 10 serving as the step switching stop means performs the sewing operation of the sewing drive unit 2 by the control unit 10 serving as the sewing step switching control means based on the automatic mode release key 40 being alternately switched on / off. Stopping switching (switching sewing steps) and canceling the stopping are alternately switched.
Specifically, for example, the control unit 10 serving as a step switching stop unit sets an automatic mode cancel flag based on a press signal associated with the pressing of the automatic mode cancel key 40 to be in an “on” state. Alternately, the automatic mode cancellation flag is cleared and set to the “off” state based on a pressing signal when the automatic mode cancellation key 40 is pressed while the automatic mode cancellation flag is set. It is supposed to switch to.
And the control part 10 as a step switching stop means switches the sewing operation | movement of the sewing drive part 2 (switching of a sewing step) based on the presence or absence of the setting of the automatic mode cancellation | release flag. .

Further, the control unit 10 subtracts the execution sewing length that the sewing driving unit 2 performed the sewing operation in each sewing step from the set sewing length set for the sewing step, and calculates the remaining sewing length. It functions as a sewing length subtraction means for calculating.
As a sewing length subtraction means, the control unit 10 determines the sewing length actually formed by the sewing drive unit 2 as, for example, “execution sewing length” = “bottom feed amount” × “number of stitches”. The remaining sewing length is calculated by subtracting the calculated “execution sewing length” from the set sewing length based on the sewing length data set for the sewing step. (“Remaining sewing length” = “Set sewing length” − “Executive sewing length”)

Then, the control unit 10 as the sewing step switching control unit is based on the fact that the remaining sewing length calculated by the control unit 10 as the sewing length subtraction unit has become a predetermined value of 0 (zero) or 0 or less. The sewing operation is switched so that the sewing drive unit 2 starts staking sewing in the next sewing step.
That is, after the sewing related to the sewing length to be sewn set in each sewing step is finished, the remaining sewing length is lost (the remaining sewing length is 0 mm, “executed sewing length” is set. The sewing step can be switched based on the fact that the sewing length has been reached.

Further, the control unit 10 as the step switching stop unit stops the process of calculating the remaining sewing length by the control unit 10 as the sewing length subtracting unit, thereby sewing by the control unit 10 as the sewing step switching control unit. The switching of the sewing operation of the drive unit 2 is temporarily stopped.
That is, when the remaining sewing length calculation process by the control unit 10 as the sewing length subtracting means is stopped, the remaining sewing length is prevented from becoming a predetermined value of 0 mm, and the sewing step switching is performed. Switching of the sewing operation of the sewing drive unit 2 (switching of the sewing steps) by the control unit 10 as control means is temporarily stopped.

  Next, the sewing operation in the automatic switching mode of the differential feed sewing machine 1 will be described based on the flowcharts shown in FIGS.

First, based on the main power supply of the differential feed sewing machine 1 being turned ON, the control unit 10 of the differential feed sewing machine 1 performs an initialization operation and sewing pattern data in an initial state stored in the ROM 10b (for example, Sewing pattern data number "01") is acquired, and a predetermined editing screen (not shown) based on the acquired sewing pattern data is displayed on the operation panel 16 (step S101).
Next, the control unit 10 determines whether or not the preparation key on the editing screen has been pressed (step S102).
When the control unit 10 determines that the preparation key on the editing screen (not shown) has been pressed (step S102; Yes), the control unit 10 displays the sewing screen based on the sewing pattern data of the sewing pattern data number “01” (see FIG. 5). Is displayed on the operation panel 16 (step S103).

Next, the controller 10 determines whether or not the step change switch 18 has been pressed and the sewing step has been changed (step S104).
When the control unit 10 determines that the step changeover switch 18 has been pressed (step S104; Yes), the control unit 10 changes the sewing step so as to switch to the next sewing step in the sewing pattern data (step S105). Proceed to step S106.
On the other hand, when the control unit 10 determines that the step changeover switch 18 is not pressed (step S104; No), the process proceeds to step S106 without changing the sewing step change.

In step S106, the control unit 10 determines whether or not the automatic mode release key 40 has been pressed (step S106).
When the control unit 10 determines that the automatic mode release key 40 has been pressed (step S106; Yes), the control unit 10 determines whether or not the automatic mode release flag is set (step S107).
When the control unit 10 determines that the automatic mode release flag is set (step S107; Yes), the setting of the automatic mode release flag is released (step S108), and the process proceeds to step S110.
On the other hand, when the control unit 10 determines that the automatic mode cancellation flag is not set (step S107; No), the automatic mode cancellation flag is set (step S109), and the process proceeds to step S110.

  Steps S104 to S109 are processes in a standby state before the differential feed sewing machine 1 performs the sewing operation.

In step S110, the control unit 10 determines whether or not the sewing machine activation pedal 15 is depressed and operated (step S110).
When the control unit 10 determines that the sewing machine activation pedal 15 is not depressed and is not operated (step S110; No), the process returns to step S104.
On the other hand, when the control unit 10 determines that the sewing machine starting pedal 15 is depressed and operated (step S110; Yes), the control unit 10 starts rotating the sewing machine motor 13 (step S111), and performs a sewing operation. Each part is controlled to perform.

  And the control part 10 performs the sewing step switching process regarding the sewing operation in the automatic switching mode of the differential feed sewing machine 1, and executes the sewing operation (step S112).

Next, the control unit 10 determines whether or not the sewing machine activation pedal 15 is depressed and operated (step S113).
When the control unit 10 determines that the sewing machine activation pedal 15 is depressed and operated (step S113; Yes), the process returns to step S112.
On the other hand, when the control unit 10 determines that the sewing machine starting pedal 15 is not depressed and is not operated (step S113; No), the control unit 10 stops the rotation of the sewing machine motor 13 (step S114), and the step Proceed to S115.

In step S115, the control unit 10 determines whether or not the sewing machine activation pedal 15 is operated in reverse (step S115).
When the control unit 10 determines that the sewing machine starting pedal 15 is not operated in reverse (step S115; No), the process returns to step S104.
On the other hand, when the control unit 10 determines that the sewing machine starting pedal 15 is operated in reverse (step S115; Yes), the control unit 10 performs thread trimming of the sewing thread by a thread trimming mechanism unit (not shown) ( Step S116).

Next, the control unit 10 determines whether or not the final sewing step in the sewing pattern being executed has been reached (step S117).
When the control unit 10 determines that the final sewing step has not been reached (step S117; No), the process returns to step S104.
On the other hand, when the control unit 10 determines that the final sewing step has been reached (step S117; Yes), the control unit 10 determines the sewing pattern data to be sewn next based on the operation of a predetermined input key. For example, the data is read again (step S118), and the process returns to step S104.

  Next, the sewing step switching process relating to the sewing operation in the automatic switching mode of the differential feed sewing machine 1 in step S112 will be described based on the flowchart shown in FIG.

While the sewing machine motor 13 of the differential feed sewing machine 1 rotates and the control unit 10 controls the operation of each part of the sewing machine, in the sewing state in which the differential feed sewing machine 1 performs a sewing operation, the control unit 10 has a step changeover switch. It is determined whether the sewing step has been switched by pressing 18 (step S201).
When the control unit 10 determines that the sewing step changeover switch 18 has been pressed (step S201; Yes), the control unit 10 changes the sewing step so as to switch to the next sewing step in the sewing pattern data (step S202). The process proceeds to step S203.
On the other hand, when the control unit 10 determines that the step switch 18 has not been pressed (step S201; No), the process proceeds to step S203 without changing the sewing step.

In step S203, the control unit 10 determines whether or not the automatic mode release key 40 has been pressed (step S203).
When the control unit 10 determines that the automatic mode release key 40 has been pressed (step S203; Yes), the control unit 10 determines whether the automatic mode release flag is set (step S204).
When the control unit 10 determines that the automatic mode release flag is set (step S204; Yes), the setting of the automatic mode release flag is released (step S205), and the process proceeds to step S207.
On the other hand, when the control unit 10 determines that the automatic mode cancellation flag is not set (step S204; No), the automatic mode cancellation flag is set (step S206), and the process proceeds to step S207.

In step S207, the control unit 10 determines whether or not the sewing machine main shaft (not shown) that is rotationally driven by the sewing machine motor 13 has rotated once (the sewing machine main shaft makes one rotation and the needle bar 130 reciprocates up and down once). It is determined whether or not a stitch for one stitch has been formed (step S207).
When the control unit 10 determines that the sewing machine spindle (not shown) has made one rotation (step S207; Yes), the control unit 10 determines whether or not the automatic mode release flag is set (step S208).
On the other hand, when the control unit 10 determines that the sewing machine spindle (not shown) has not made one rotation (step S207; No), the control unit 10 ends the sewing step switching process and proceeds to step S113.

When the control unit 10 determines that the automatic mode release flag is not set (step S208; No), the control unit 10 calculates the remaining sewing length in the current sewing step (step S209).
Next, the control unit 10 determines whether or not the remaining sewing length is “0 mm” (step S210).
When the control unit 10 determines that the remaining sewing length is “0 mm” (step S210; Yes), the control unit 10 switches the sewing step and performs the sewing drive so as to execute the sewing operation related to the next sewing step. The sewing operation of part 2 is switched (step S211), the sewing step switching process is terminated, and the process proceeds to step S113.

On the other hand, when the control unit 10 determines that the remaining sewing length is not “0 mm” (step S210; No), the control unit 10 ends the sewing step switching process and proceeds to step S113.
If the control unit 10 determines that the automatic mode release flag is set (step S208; Yes), the control unit 10 ends the sewing step switching process without switching the sewing step, and proceeds to step S113. move on.

As described above, the differential feed sewing machine 1 according to the present invention is used when performing staking sewing based on the staking amount set in each sewing step in the selected sewing pattern, and is set in each sewing step. By pressing the automatic mode release key 40 during the sewing operation in the automatic switching mode in which the sewing step is automatically switched to the next sewing step when the sewing for the sewing step length is completed, By setting an automatic mode release flag indicating that the automatic mode release key 40 is in the “on” state and temporarily stopping the calculation of the “remaining sewing length”, the “remaining sewing” is the timing for switching the sewing step. By preventing the “length” from becoming “0 mm”, the automatic switching of the sewing step can be temporarily stopped.
That is, during the sewing operation in the automatic switching mode in which switching is automatically performed to shift to the next sewing step, the automatic mode cancellation flag that is in the “on” state is set by pressing the automatic mode cancellation key 40. Then, the automatic switching of the sewing step is temporarily stopped, so that the sewing operation by the sewing driving unit 2 is not switched to the sewing operation related to the next sewing step. Then, the sewing step length is longer than the sewing step length set for the sewing step, and the sewing sewing based on the sewing amount set for the sewing step can be performed.
Therefore, it is necessary to urgently interrupt the sewing of a sewing product that is partially different in size or when correcting a cutting error that has occurred in the sewing product or a dimensional error due to the expansion / contraction characteristics of the sewing product. In such a case, it is possible to perform sewing while easily adjusting the sewing length by temporarily correcting the sewing length.
Therefore, the differential feed sewing machine 1 can flexibly cope with a change in the sewing length due to variations in the work to be sewn, and does not require a complicated operation as in the prior art. It can be said that this is a differential feed sewing machine that can easily adjust the sewing length to be sewn.

(Embodiment 2)
Next, a second embodiment of the differential feed sewing machine according to the present invention will be described. In addition, the same code | symbol is attached | subjected to the same part as Embodiment 1, and only a different part is demonstrated.

  In the first embodiment described above, when the automatic mode cancel key 40 is pressed and the automatic mode cancel flag is set, the process of calculating the remaining sewing length by the control unit 10 as the sewing length subtracting means is performed. By not doing so, the sewing operation of the sewing drive unit 2 is prevented from being switched to the next sewing step, but in the second embodiment, when the automatic mode release flag is set, By prohibiting switching to the next sewing step, the sewing step length is longer than the sewing step length set in advance for the sewing step, and the sewing operation is performed based on the amount of sewing set in the sewing step. Make it possible.

  Regarding the sewing operation in the automatic switching mode of the differential feed sewing machine 1 according to the second embodiment of the present invention, the sewing step switching process in step S112 will be described based on the flowchart shown in FIG.

While the sewing machine motor 13 of the differential feed sewing machine 1 rotates and the control unit 10 controls the operation of each part of the sewing machine, in the sewing state in which the differential feed sewing machine 1 performs a sewing operation, the control unit 10 has a step changeover switch. It is determined whether the sewing step has been switched by pressing 18 (step S301).
When the control unit 10 determines that the sewing step changeover switch 18 has been pressed (step S301; Yes), the control unit 10 changes the sewing step so as to switch to the next sewing step in the sewing pattern data (step S302). The process proceeds to step S303.
On the other hand, when the control unit 10 determines that the step switch 18 has not been pressed (step S301; No), the process proceeds to step S303 without changing the sewing step.

In step S303, the control unit 10 determines whether or not the automatic mode release key 40 has been pressed (step S303).
When the control unit 10 determines that the automatic mode release key 40 has been pressed (step S303; Yes), the control unit 10 determines whether or not the automatic mode release flag is set (step S304).
When the control unit 10 determines that the automatic mode release flag is set (step S304; Yes), the setting of the automatic mode release flag is released (step S305), and the process proceeds to step S307.
On the other hand, when the control unit 10 determines that the automatic mode cancellation flag is not set (step S304; No), the automatic mode cancellation flag is set (step S306), and the process proceeds to step S307.

In step S307, the control unit 10 determines whether or not the sewing machine spindle (not shown) that is driven to rotate by the sewing machine motor 13 makes one rotation (the sewing machine spindle makes one rotation and the needle bar 130 reciprocates up and down once). It is determined whether or not a stitch for one stitch has been formed (step S307).
When the control unit 10 determines that the sewing machine spindle (not shown) has made one rotation (step S307; Yes), the control unit 10 determines whether the remaining sewing length has become “0 mm” (step S308). ).
On the other hand, when the control unit 10 determines that the sewing machine spindle (not shown) has not made one rotation (step S307; No), the control unit 10 ends the sewing step switching process and proceeds to step S113.

When the control unit 10 determines that the remaining sewing length is “0 mm” (step S308; Yes), the process proceeds to step S311.
On the other hand, when the control unit 10 determines that the remaining sewing length is not “0 mm” (step S308; No), the control unit 10 calculates the remaining sewing length in the current sewing step (step S309). .

Next, the control unit 10 determines whether or not the remaining sewing length is “0 mm” (step S310).
When the control unit 10 determines that the remaining sewing length is not “0 mm” (step S310; No), the control unit 10 ends the sewing step switching process and proceeds to step S113.
On the other hand, when the control unit 10 determines that the remaining sewing length is “0 mm” (step S310; Yes), the control unit 10 determines whether or not the automatic mode release flag is set (step S311). ).

When the control unit 10 determines that the automatic mode release flag is not set (step S311; No), the control unit 10 switches the sewing step and performs the sewing operation related to the next sewing step. The sewing operation of the drive unit 2 is switched (step S312), the sewing step switching process is terminated, and the process proceeds to step S113.
On the other hand, when the control unit 10 determines that the automatic mode release flag is set (step S311; Yes), the control unit 10 ends the sewing step switching process without switching the sewing step, and proceeds to step S113. move on.

As described above, the differential feed sewing machine 1 according to the present invention presses the automatic mode release key 40 during the sewing operation in the automatic switching mode that is automatically switched to the next sewing step. By setting an automatic mode release flag indicating that the automatic mode release key 40 is in the “on” state, automatic switching to the next sewing step can be temporarily stopped. That is, during the sewing operation in the automatic switching mode in which switching is automatically performed to shift to the next sewing step, the automatic mode cancellation flag that is in the “on” state is set by pressing the automatic mode cancellation key 40. Then, the automatic switching of the sewing step is temporarily stopped, so that the sewing operation by the sewing driving unit 2 is not switched to the sewing operation related to the next sewing step. Then, the sewing step length is longer than the sewing step length set for the sewing step, and the sewing sewing based on the sewing amount set for the sewing step can be performed.
Therefore, even in such a sewing step switching process, when a cutting error that has occurred in the sewing product or a dimensional error due to the expansion / contraction characteristics of the sewing product is corrected, or when the sewing is partially different in size. When it is necessary to urgently interrupt the sewing of an object, the sewing length can be temporarily corrected so that the sewing can be performed while easily adjusting the sewing length. Therefore, the differential feed sewing machine 1 can flexibly cope with a change in the sewing length due to variations in the work to be sewn, and does not require a complicated operation as in the prior art. It can be said that this is a differential feed sewing machine that can easily adjust the sewing length to be sewn.

  In the above embodiment, the differential feed sewing machine has been described as an example. However, the present invention is not limited to this, and may be a sewing machine that performs sewing with different sewing lengths for each of a plurality of sewing steps. The present invention can be applied.

  Further, the present invention is for performing a sew-in sewing with a predetermined squeeze amount that is longer than a sewing length preset in the sewing step, but shorter than a sewing length preset in the sewing step, When performing squeeze stitching with a predetermined squeeze amount, the sewing length can be adjusted by operating the step changeover switch 18 to forcibly advance to the next sewing step.

  In addition, it is needless to say that other specific detailed structures can be appropriately changed.

1 is a perspective view of a differential feed sewing machine according to the present invention. FIG. 2 is an enlarged view of a portion II in FIG. 1 and is an enlarged view around the upper feed mechanism portion of the differential feed sewing machine. It is the schematic of the differential feed sewing machine concerning this invention. It is a block diagram which shows the principal part structure of the differential feed sewing machine concerning this invention. It is explanatory drawing which shows an example of the sewing screen in the differential feed sewing machine concerning this invention. It is a flowchart which shows the process of the sewing operation | movement in the automatic switching mode of a differential feed sewing machine. It is a flowchart which shows the sewing step switching process in Embodiment 1 of this invention. It is a flowchart which shows the sewing step switching process in Embodiment 2 of this invention.

Explanation of symbols

1 Differential feed sewing machine 2 Sewing drive (sewing means)
3 Upper feed mechanism section 4 Lower feed mechanism section 5 Needle movement mechanism section 10 Control section (sewing step switching control means, step switching stop means, sewing length subtraction means)
10a MPU
10b ROM (storage means)
10c RAM
10d EEPROM (storage means)
15 Sewing machine start pedal 16 Operation panel 17 Auxiliary panel 18 Step change switch 30 Display figure 31-38 Section figure (sewing step)
40 Automatic mode release key (predetermined switch, step switching stop means)
41 Sewing length display field

Claims (3)

Storage means for storing sewing pattern data relating to the sewing quantity set for each of the plurality of sewing steps and sewing pattern data including sewing length data relating to the sewing length in the sewing step;
Sewing means for performing a sewing operation of sew-on stitches composed of a plurality of sewing steps based on sewing pattern data stored in the storage means;
Based on the fact that the sewing means has finished the sewing sewing of the sewing length set for each sewing step, the sewing operation of the sewing means is switched so as to start the sewing sewing in the next sewing step. Sewing step switching control means;
A differential feed sewing machine comprising:
Step switching stop means for temporarily stopping switching of the sewing operation of the sewing means by the sewing step switching control means so that the sewing operation by the sewing means is not switched to the sewing operation relating to the next sewing step. Features a differential feed sewing machine. The sewing means includes a sewing length subtracting means for subtracting the sewing length for which the sewing operation has been performed in each sewing step from the sewing length set for the sewing step and calculating the remaining sewing length. ,
The sewing step switching control means performs sewing so that the sewing means starts the staking sewing in the next sewing step based on the remaining sewing length calculated by the sewing length subtracting means becoming a predetermined value. The step switching stopping means temporarily switches the sewing operation of the sewing means by the sewing step switching control means by stopping the process of calculating the remaining sewing length by the sewing length subtracting means. The differential feed sewing machine according to claim 1, wherein the differential feed sewing machine is stopped at a short time.   The step switching stop means is configured to stop the sewing operation switching of the sewing means by the sewing step switching control means and release the stop based on the on / off switching of a predetermined operation switch. The differential feed sewing machine according to claim 1 or 2, wherein the differential feed sewing machine is switched alternately.

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