JPH04129586A - Sewing machine with tape feeder - Google Patents

Abstract

PURPOSE:To obtain a sewing machine with a tape feeder efficiently setting the number of stitches in each sewing segment and the tape feed quantity for each stitch by providing an automatic setting means storing the combination of the feed quantity for each stitch set by a feed quantity setting means and the detected value counted by a stitch number detecting means in a set value memory means during the trial sewing. CONSTITUTION:A sewing machine with a tape feeder has a segment changing means instructing the switching of a sewing segment on a work fabric and an automatic setting means storing the combination of the feed quantity for each stitch set by a feed quantity setting means and the detected value counted by a stitch number detecting means in a set value memory means for each segment determined based on the instruction from a segment changing means during the trial sewing. The combination of the number of stitches and the set value of the tape feed quantity can be automatically set for each segment under the same condition as for the actual sewing, the preparation work for the sewing work is efficiently performed, and the productivity of the whole sewing work can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sewing machine equipped with a tape feeding device used for shirring sewing.

[Conventional technology] A stretchable sewing tape such as rubber tape is sewn into a processed fabric such as underwear in a stretched state to form a moderate wave pattern in the processed fabric, giving it a three-dimensional shape and elasticity. "Shirring sewing", which is a sewing method to provide the tape, is realized in the following manner in a conventional sewing machine equipped with a tape feeding device.

That is, this is realized by detecting the sewing operation of the sewing machine and adjusting the amount of rotation of the tape supply motor so that a preset amount of tape is fed per stitch. The tape feeding amount per stitch may also be set not only for one type but for a plurality of types for each workpiece cloth. This is because the sewing section of the work cloth is divided into sections during sewing, and the tape feeding rate is changed for each section, thereby achieving a variety of finished products.

In this case, it is necessary to set in advance the number of stitches in each section and the amount of tape feed per stitch in each section as a preparatory work.

[Problem to be solved by the invention] However, since the number of stitches required to sew each section of the work cloth is determined from the relationship between the length of each section and the feed pitch of the sewing machine, the length of the section must be determined before the sewing operation. If the section is a curve, measurement becomes quite troublesome.Furthermore, depending on the processed fabric, there may be a discrepancy between the simple calculation and the actual sewing, and further adjustment is required. becomes.

As described above, in the conventional sewing machine equipped with a tape feeding device, the efficiency in the preparation stage of sewing work is poor, and the productivity of the sewing work as a whole is reduced.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a sewing machine with a tape feed device that can efficiently set the number of stitches in each sewing section and the amount of tape feed per stitch. It is something.

[Means for Solving the Problems] In order to achieve the above object, a sewing machine with a tape feeding device according to the present invention includes a stitch number detection means for counting the number of stitches in a sewing operation, and a stitch count detection means for counting the number of stitches in a sewing operation, as illustrated in FIG. a tape supply means for feeding the stretchable sewing tape to the workpiece cloth in synchronization with the tape supply means; a feed amount setting means for setting the feed amount per stitch of the tape feed means; and a plurality of preset above feeds. Setting the amount
and a set value storage means for storing the set value of the number of stitches to be combined with the set value of each feed amount; , a sewing machine equipped with a tape feeding device and a sewing control means that adjusts the feeding amount per stitch of the tape feeding device according to the number of stitches in the sewing operation, and further comprising: a sewing machine equipped with a tape feeding device, which switches sewing sections on a workpiece cloth; a section changing means for instructing; and a feed amount per stitch set by a pre-delivery feed amount setting means for each section determined based on instructions from the section changing means during trial sewing; and automatic setting means for storing a combination of detection values counted by the number of stitches detection means in the set value storage means.

[Function] The tape feeding amount is obtained from the setting value in the feeding amount setting means, but the actual number of stitches is detected by the automatic setting means when the set value of the number of stitches for each section on the work cloth is trial-sewn. The number of stitches is automatically obtained from the stitch count detection means.

Therefore, the worker measures the length of each sewing section of the processed cloth,
The tape feed amount setting value automatically calculates the number of stitches under conditions equivalent to actual sewing without having to perform the troublesome preparation work of calculating the number of stitches from the measured value. Can be set for each section in combination with

[Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 2 shows a sewing machine 1 for double-sided decorative stitching equipped with a tape feeding device. This sewing machine 1 is not equipped with a drive motor 3. Its output is transmitted via a belt 5 and a pulley 7 to a lower shaft 9 disposed in the bed portion 1a. The signal is then transmitted to the main shaft 13 disposed on the arm portion 1b.

The lower shaft 9 drives mechanisms such as a feed dog and a looper (not shown) provided in the bed portion 1a. The main shaft 13 is the arm portion 1b
It drives mechanisms such as the needle 15 and spreader (not shown) provided in the. Since these mechanisms are well known and common, details will be omitted. Note that the rotation speed of the drive motor 3 is adjusted by the motor drive circuit 3b according to the amount of depression of a foot switch 3a provided at the foot of the worker.

A needle position detector] 7 consisting of a Hall element is provided facing the pulley 7 of the lower shaft 9. This needle position detector 17 captures the magnetism of the magnet provided on the pulley 7 and
The fixed position of the hand 15, which is being driven up and down in conjunction with the movement of the needle 15, is detected. A needle position detection signal from the needle position detector] 7 is input to the control device 19. A speed detector (not shown) made of a Hall element is provided near the needle position detector] 7, and detects the rotational speed of the main shaft 13 by capturing the magnetism of the plurality of magnets provided on the pulley 7. are doing.

A roller A21 and a roller B23 are provided at the tip of the arm section]b. One roller A21 rotates freely,
The other roller B23 is connected to the joint 27 by the pulse motor 25.
and rotated via axis 29. Therefore, arm portion 1b
If a stretchable sewing tape, here a rubber tape 31, is supplied from a tape supply source (not shown) provided above and held between rollers A21 and B23, the rotation of the pulse motor 25 per stitch is reduced. The rubber tape 3] can be supplied to the sewing position 331 with a supply amount depending on the amount and the radius of the roller B23. At the sewing position 33, as shown in FIG. 3, the presser foot 3 attached to the tip of the presser bar (not shown)
5 presses the rubber tape 31 and the work cloth 37 against a throat plate (not shown).

In this way, the rubber tape 31 and work cloth 37 fed to the sewing position 33 are attached to the needle 15 provided at the tip of the needle bar 4 which is moved up and down as the main shaft 13 rotates, the spreader, and the rotation of the lower shaft 9. Along with this, the stitches are sewn together in cooperation with a louver (not shown) which is driven in synchronization with the needle 15, and both sides are decorated. Then, it is sent backward on the bed surface 43 by a feed dog (not shown).

The control device 19 is configured as a computer.
It includes an OM, a RAM (including a backup RAM), an input/output interface, and a path line for transmitting signals between them, and a CPU executes predetermined processing according to a processing program stored in a ROM. The predetermined processing is performed by inputting signals from the needle position detector 17, the knee switch 45 provided at the worker's knee position, and the operation panel 47 via the input/output interface, and based on the input data. Necessary calculation processing is performed, and as a result of the calculation, various displays are executed on the operation panel 47 via the input/output interface, and pulse signals for controlling rotation are output to the pulse motor 25.

The automatic setting value input process performed by the CPU in the control device 9 based on the processing program and data stored in the ROM will be described with reference to the flowchart in FIG.

When the process starts, a program number selection request is first made (S110). This request is made by simply displaying it on the operation panel 47. Note that the program number refers to a number indicating the type of work program, and is not a processing program that describes a processing procedure stored in the ROM. This number selection is made from among nine types of tags provided to store setting values to be inputted for each task separately.

In response to this request, the operator operates switches on the operation panel 47 to select an appropriate program number. Setting values for each section in subsequent operations will be set for this program number.

Next, input of the tape feeding amount for the 0th section is requested (S1
20). This value is also input by the operator by operating the switches on the operation panel 47. The O-th section means a section in which sewing is actually performed without a work cloth, that is, an empty stitching section. Since it does not affect the sewing finish, an appropriate value may be selected as the tape feeding amount for the 0th section, but it is preferable to select a value close to the first section that will be set next. In the example shown in FIG. 6, it is set to 3.5 mm/one stitch. Further, since the O-th section is an empty stitching section, the number of stitches thereof is not set.

Next, "1" is written to a variable N set in a predetermined memory in the RAM representing the section number (S130).

Next, input of the tape feeding amount for the first section is requested (S
140). In response to this, the operator inputs from the operation panel 47. In the example shown in FIG. 6, the setting is 3 mm/1 stitch.

Next, it is determined whether the reset switch on the operation panel 47 has been pressed (S150). If it is pressed, the specified memory in the RAM representing the value of the number of stitches in the first section will be set to “
0” (8160). This is executed when canceling the previously set number of stitches and setting it again.

If the noset switch is not pressed, the next process is executed with the previous value set for the same section maintained.

Next, the CPU determines whether a needle position detection signal is detected (S170). If the foot switch 3a is depressed, the needle 1 will move in conjunction with the rotation of the drive motor 3.
5 moves up and down to perform sewing. Therefore, each time the needle 15 moves up and down, the needle position detector 17 outputs a needle position detection signal.

If this signal is detected, the number of stitches in the first section is incremented (S190).

Next, in order to correct the number of stitches, it is determined whether or not the stitch number increase/decrease switch on the operation panel 47 has been pressed (S200), and when the increase/decrease switch has been pressed, the stitch number correction for the first section is executed. (S 210). Here, while checking the contents of the operation panel 47 that displays the set number of stitches,
The operator operates the increase/decrease switch on the operation panel 47. The increase/decrease switch is repeatedly pressed until the desired number of stitches is reached, and each time step 210 is executed to correct the number of stitches. If the increase/decrease switch is pressed, the first
The value of the number of stitches in the section is decremented when the increment button 2 decrement side is pressed.

When the processes from step 170 to step 2]0 are repeated, it is determined whether or not the section is changed (S22
0). This determination is made based on the operating state of the section change switch or the input end switch on the operation panel 47.

If neither the section change switch nor the input end switch is pressed, steps 170 to 210 are not repeated again.The number of stitches is incremented by continuing trial sewing in the same section (S190) or corrected ( S210) is performed.

If it is determined in step 220 that the section change switch has been pressed, it is determined whether the input is complete (S 230).
. Since this determination determines whether the input end switch has been pressed, a negative determination is made here, and then the variable N representing the section number is incremented (S240).
. That is, the processing is switched from the first section to the second section. Therefore, at this point, the number of stitches for the first section has been determined. In the example of FIG. 6, it is set to 50 stitches.

Then, the processing from step 140 onwards is executed again while changing the section each time the section changing switch is pressed.

In this way, a desired combination of tape feeding amount and number of stitches is set for a desired section. For example (L) As shown in Figure 6, in the second section, the tape feeding amount is 1.5 mm/
1 stitch and the number of stitches are set to 15. In the third section, the tape feed amount is set to 2 mm/1 stitch and the number of stitches is set to 30 stitches.

In this way, the setting of each section is completed, and the operator presses the input end switch (L).An affirmative determination is made in steps 220 and 230, and the process ends.

In the automatic input process described above, input of the tape feeding amount (51
20, 5140), incrementing the number of stitches by trial sewing (S 190), and correcting the set value of the number of stitches (S 21).
0), but of course it is also possible to execute only one or two arbitrary processes and then end the process by inputting from the operation panel 47.

The tape feed rate and number of stitches set in this way are set while checking the finished product during trial sewing, so if you automatically execute the sewing work based on the set values, it will be as expected. finish can be achieved.

Next, a playback process executed by the control device 9 for automatic sewing based on the data set as described above will be described. The flowchart is shown in FIG.

First, selection of a program number is requested (S310),
The program number is input by the operator via the operation panel 47. In the RAM in the control device 19, set values for the tape feeding amount and the number of stitches are stored for each program number through the above-mentioned automatic input process. Therefore, by selecting a program number, a series of corresponding set values for the tape feed amount and number of stitches are read out into the working RAM area.

For example, a series of setting values shown in FIG. 6 are read out.

Next, when the foot switch 3a is operated by the operator and the drive motor 3 starts rotating, the pulse motor 25 is activated at the tape feeding amount of the O-th section every time the needle position is detected.
is driven (S320).

In the example shown in FIG. 6, the pulse motor 25 moves the rubber tape 3 to the rubber tape 3 in response to a needle position detection signal generated from the needle position detector 7 for each stitch. Feed in 5mm increments.

Next, it is determined whether or not the knee switch 45 has been pressed.
330), if the button is not pressed, the tape feeding process (S320) of the Oth section is repeated.

As shown in FIG. 6, the variable N is set to "1" at the turn-on timing of the knee switch 45 (S340). That is, execution of the first section process is set.

Next, the stitch number counter NC provided in the RAM is cleared (S350).

Next, in response to the detection of the needle position, the pulse motor 25 is driven so as to achieve the tape feeding amount for the first section (S36).
0), in the example shown in Fig. 6, 3 m of rubber tape 31 is applied for each stitch.
Feed by m.

Next, the stitch count counter NC is incremented (S
370).

Next, it is determined from the value of the stitch count counter NC whether sewing has been completed for the number of stitches set in the first section (S
380). In FIG. 6, it is determined whether or not 50 stitches of sewing have been completed for the first section. If not, steps 360 and 370 are repeated.

When the sewing for the set number of stitches is completed and an affirmative determination is made in step 380, it is then determined whether or not the sewing of the entire section has been completed (S390). If the interval in which the set value exists still exists, the variable N is incremented (S
400), move on to the next section. And again, step 3
The process is repeated from 50 onward, and sewing is performed using the tape feeding amount and number of stitches set for each section. In Figure 6,
In the second section, apply rubber tape 31 1. 15 stitches of 5 mm each are fed, and in the third section, 30 stitches of 2 mm of rubber tape 3 are fed for each stitch.

When the sewing of the entire section is completed in this way, an affirmative determination is made in step 390, and the process returns to step 320 in order to proceed to the sewing process of the next workpiece cloth 37.

In this way, the same sewing process is continuously performed on a plurality of pieces of work cloth 37. When the sewing process is to be terminated, the playback process can be terminated by inputting a termination signal or a mode change signal to another process from the operation panel 47.

In this embodiment, as described above, it is possible to set the number of stitches data while confirming the finished product through trial sewing, and therefore it is possible to easily set accurate data. Corrections can also be made with a switch or by re-trying a trial stitch, allowing for very easy and accurate corrections.

Therefore, the labor at the preparation stage of the sewing work is reduced and the overall productivity of the sash is improved.

Effects of the Invention As described in detail above, in the present invention, the number of stitches required for each section is automatically stored by actually performing trial sewing.

Therefore, the settings can be automatically set for each section without the need for the operator to carry out the troublesome preparation work of measuring the length of each sewing section of the workpiece fabric and calculating the number of stitches from that measurement. .

Therefore, the preparation work for sewing work becomes efficient, and the productivity of the sewing work as a whole can be improved.

[Brief explanation of the drawing]

Figure 1 is a basic illustration of the present invention, Figure 2 is a block diagram of the main components of a sewing machine equipped with a tape feeding device, Figure 3 is a side view of the sewing machine's vicinity, and Figure 4 is an automatic input process. FIG. 5 is a flowchart showing playback processing, and FIG. 6 is an explanatory diagram showing switching of sections and contents of set values in each section. 1... Sewing machine for double-sided decorative stitching, 3... Drive motor, 3a... Foot switch Sochi,
90.・Lower shaft, 13... Main shaft, 15... Needle, 17.
- Needle position detector, 19... Control device, 25... Pulse motor, 31... Rubber tape, 37... Processing cloth, 45... Knee switch, 47... Operation panel

Claims (1)

[Scope of Claims] Stitch number detection means for counting the number of stitches in a sewing operation; tape supply means for feeding elastic sewing tape to a workpiece cloth in synchronization with the sewing operation; and per stitch of the tape supply means. a feeding amount setting means for setting a feeding amount; and a setting value for storing a plurality of preset feeding amount settings and a setting value for the number of stitches to be combined with each feeding amount setting value. and a storage means, and the feeding amount per stitch of the tape supplying means is adjusted according to the number of stitches in the sewing operation based on a combination of the setting values read out in a predetermined order from the setting value storage means during sewing. A sewing machine equipped with a tape feeding device, further comprising: a sewing control means for controlling a sewing section; and a section changing means for instructing switching of sewing sections on a workpiece cloth; The combination of the feed amount per stitch set by the feed amount setting means and the detected value counted by the number of stitches detection means is stored in the set value storage means for each section determined based on the above. A sewing machine with a tape feeding device, characterized in that it is equipped with an automatic setting means for storing the settings in the memory, and the following.