JPH0467883A - Hem stitching pattern forming device for hem stitching sewing machine provided with thread supply device - Google Patents

Abstract

PURPOSE:To form a colorful pattern by executing the sewing operation of data with respect to a hem stitching pattern repeatedly based on the information of combinational sequence of stitching pattern of one cycle of the hem stitching pattern, the number of stitching of each stitching pattern, the thread needle of each stitching pattern, and the thread quantity ratio of looper thread. CONSTITUTION:The needle thread T1, the looper thread T2, T3 passing a hold solenoid 18, etc., are sewn on cloth placed on a cloth table 3 by a needle 5 moving on a constant locus according to the rotation of the main spindle of a sewing machine, an upper looper 21, and a lower looper 22. A texture sensor which detects cloth to be sewn optically is arranged in the neighborhood of a needle location where the needle 5 is located, and also, a needle position detecting sensor which detects the needle 5 based on the angle of rotation of the main spindle is provided at the main spindle part of the sewing machine being rotated, and furthermore, a rotary encoder which detects the angle of rotation of a motor which drives a driving roller 12 is provided at the motor. A detection signal is sent to a control part 100 provided at a hem stitching pattern forming device 10, and the sewing machine is comprised so as to perform the automatic control of the hold timing of a hold solenoid 15, etc., by the hem stitching pattern forming device 10 based on the above signal and another signal.

Description

[Detailed Description of the Invention] Leather Industry Summer ■Uni■ The present invention provides an overlock stitch sewing machine equipped with a thread supply device capable of performing overlock stitches so that an edge stitch pattern can be expressed by the seam itself. The present invention relates to an edge stitching pattern forming device.

In conventional limb-kin overlock sewing machines, needle thread and two upper and lower looper threads are used, and the conventional hem stitch pattern forming device equipped with this sewing machine uses needle thread and two looper threads. In each case, two plate-shaped clamping members 111 and 112 as shown in FIG. A cam 114 is provided at the tip of the rod 113 that moves the rod 113 toward and away from the thread, and the shape of the cam 114 changes the thread clamping force, thereby adjusting the thread feed amount of each thread. It is configured to change the pattern of the eyes.

However, due to its mechanism, when using a cam, only patterns that change relatively slowly can be formed; for example, a pattern that changes rapidly as shown in Figure 9 cannot be formed. Furthermore, when changing the stitch pattern, the cam must be replaced, which makes the work complicated.

The present invention has been made to solve such problems,
A hem stitch pattern forming device for an overlock sewing machine, which is equipped with a thread supply device that can form a seam pattern without using a cam that complicates work, and can also dramatically change the degree of pattern change. The purpose is to provide

The hem stitch pattern forming device of the hem stitch sewing machine equipped with the thread supply device according to the present invention for forming a hem stitch pattern according to the present invention pinches the sewing thread with a rotating roller, and adjusts the amount of stitches necessary for forming a stitch according to the amount of rotation of the rotating roller. In an overlock sewing machine equipped with a thread supply device that supplies a sufficient amount of thread, data regarding the hem stitch pattern is stored in the following data: the combination order of stitch patterns for one cycle of the hem stitch pattern, the number of stitches in each stitch pattern, and the number of stitches in each stitch. A storage means for separately storing information on the thread amount ratio of needle thread and looper thread for each different edge stitching pattern, and a memory means for storing information on the thread amount ratio of the needle thread and looper thread of the pattern, and a memory means for storing each edge stitching pattern separately from the information on the thread amount ratio of the needle thread and looper thread of the pattern; A selection means for selecting a pattern and reading data regarding the selected edge stitching pattern,
The present invention is characterized by comprising an execution means for repeatedly executing a sewing operation based on this data.

In the present invention, instead of using a conventional cam mechanism, data regarding the edge stitching pattern is stored in a storage means, the selection means selects this data, and the execution means selects this data. Since the sewing operation based on the sewing machine is repeatedly executed, a variety of patterns that could not be realized with a cam mechanism can be formed by simply storing data for one cycle of a desired hem stitch pattern in the storage means. For example, in the case of one pattern, if the upper louver thread T2 is yellow and the lower looper thread T3 is red in FIG. It is also possible to form

Furthermore, the pattern can be changed by rewriting the stored data using a rewriting means.

Figure 1 shows an embodiment of a sewing machine equipped with an edge stitching pattern forming device according to the present invention. In the figure, 1 is an overlock sewing machine equipped with a thread supply device. a pressing part 4 that presses the cloth placed on the cloth table 3 toward the cloth table 3 with a predetermined force, an arm 6 to which a sewing needle 5 is attached, and a lower part of the needle 5. The upper looper 7 and lower looper 8 provided inside the sewing machine frame 9, and the three threads Tl, T2, which are threaded around the needle 5 and the upper and lower loopers 7, 8. A drive roller 2 and a driven roller 13 that pinch and supply T3, and five gripping solenoids 15, 16, 17, which are provided in the vicinity and grip each thread and adjust the amount of supply per stitch, respectively. 1
8.19 and further controls the gripping timing of these gripping solenoids 15 to 19 to form a pattern on the seams, and displays the control contents of the hem sewing pattern forming apparatus 100. Control content display section 20
and the sewing machine frame 9 to set or change the display contents.
An operation key part 30 is provided on the front side of the machine.

Three threads TI, T2. T3 is supplied to the sewing machine side, and these three threads TI, T2. T3
enters the inside of the sewing machine frame 9 from the upper part, is forcibly supplied by the drive roller 12 and driven roller 13, and after adjusting the thread feed amount by the gripping solenoid 15 etc., the thread is passed through the threading members. through each needle 5. Upper looper 7° leads to lower looper 8. Here, the thread TI guided to the needle 5 is called a needle thread, the thread T2 guided to the upper looper 7 is called an upper looper thread, and the thread T3 guided to the lower looper 8 is called a lower louver thread.

The drive roller 12 is formed in a stepped shape having a large diameter portion 12a and a small diameter portion 12b with different diameters, and is attached to the sewing machine frame 9.
It is driven by an internal motor (not shown). One of the driven rollers 13 is divided to press the two circumferential surfaces of the large diameter portion 12a and the small diameter portion 12b of the drive roller 12, and includes two large and small divided rollers 13a and 13b, with the larger divided roller 13a is the drive roller 12
The large diameter portion 12a of the upper and lower louver threads T2. T3 is passed through, and the smaller divided roller 13b presses the small diameter portion 12b of the drive roller 12, and the needle thread T1 is passed between them, and each section is sent by the rotation of the roller.

Three gripping solenoids 15, 16, 17 provided on the upstream side in the yarn supply direction with respect to the drive roller 12 are arranged in the respective prefectures Tl, T2. Holding T3, each prefecture moves the drive roller 12
This is to adjust the amount of yarn supplied by forcibly stopping the yarn being fed to the side, and the two grip solenoids 1 on the downstream side
8.19 is for gripping the thread so that the thread is not sent to the downstream side excessively due to the tension generated on the planned location side during sewing; the gripping solenoid 18 is for the needle thread Tl, and the gripping solenoid 19 is for is two looper threads T2. It is for T3.

Each of the above-mentioned gripping solenoids 15 to 19 is a solenoid main body 15.
a to 19a and the press plate 15 attached to the tip of the solenoid shaft.
b to 19b, and when energized, press plates 15b to 19b
approaches the solenoid bodies 15a to 19a and grips the needle thread and louver system between them. The gripping force of each gripping solenoid 15, etc. is sufficiently stronger than the thread conveying force of the drive roller 12, and the gripping period is set to the maximum system consumption of the sewing machine in each sewing cycle, and other predetermined threads are The period is set to allow the supply of the amount. Furthermore, in each sewing cycle, the gripping solenoids 18 and 19 perform a gripping operation only during a period in which the tension on the sewing section side is large during an open period in which the gripping solenoids 15 to 17 do not grip the thread.

Needle thread Tl, looper thread T2. T3 is the needle 5 and the upper looper 21. The lower looper 22 sews onto the cloth placed on the cloth table 3.

Near the planned location where the needle 5 will fall, there is a fabric sensor (not shown) that optically detects whether the fabric to be sewn is present.
In addition, on the rotating main shaft of the sewing machine, which is not shown in the figure, there is a needle that detects where the needle 5 is between top dead center and bottom dead center based on the rotation angle of the main shaft. A position detection sensor (not shown) is provided, and the drive roller 1
The motor that drives the motor 2 is equipped with a rotary encoder that detects its rotation angle. Signals from these detectors are sent to a control unit 100 (see FIG. 2) provided in the hem stitch pattern forming device 110, and the sewing machine uses the hem stitch pattern forming device 10 to control gripping based on these signals and other signals. It is configured to enable automatic control of the gripping timing of the solenoid 15 and the like. Note that the control content is displayed on the control content display section 20.

FIG. 2 is a block diagram showing a control section provided in the hem stitch pattern forming apparatus 10. As shown in FIG. This control unit 100 is a CPU
Equipped with O1, ROM102 and RAMIO3, CPU
Signals from an input circuit, such as a signal from a needle position detection sensor, a sewing machine rotation signal, a signal from a material sensor, a signal from an operation key part 30, etc., are input to l0I via l10104, and the gripping solenoid 15 It is configured to output control JB signals and drive signals to the LCD of the control content display section 20, the main motor, the motor, etc.

FIG. 3 shows the contents of the control data stored in the RAM 103, in which (a) is a basic table storing hem stitch pattern numbers for determining a plurality of different hem stitch patterns, and (b) is an auxiliary table that stores data regarding each edge stitching pattern number of the basic table. This auxiliary table contains the zone order, which is the order in which the multiple stitch patterns that make up each hem stitch pattern are combined, the number of stitches, which indicates how many stitches the same stitch pattern is to be repeated, the needle thread, and the upper and lower louver threads. The number of pulses that determines the timing for switching the gripping solenoids 15 to 17 for gripping the prefecture from off to on based on a pulse signal from a row encoder provided in the motor is stored.

Reading of such control data is performed by the operation key part 30, for example, when the hem stitching pattern pattern No.
When 100 is specified as a key, the corresponding address part from the auxiliary table, that is, addresses 1000 to 10
The contents of 05 are set, for example, in an execution area (not shown) provided in the auxiliary table. Further, when edge stitching pattern No. 1006 is keyed in the basic table, the corresponding address portions from the auxiliary table, that is, the contents of addresses 1006 to 100F are set in an execution area (not shown). The same applies to other edge stitching pattern numbers.

FIG. 4 is a part of a stitch pattern determination table which is stored in the same RAM 103 and determines a stitch pattern based on the number of pulses. The Arabic numerals in the figure indicate the number of pulses, and the Roman numerals indicate the stitch pattern. For example, if the number of pulses of the needle thread is 11, the number of pulses of the upper louver thread is 36, and the number of pulses of the lower looper thread is 37, the corresponding stitch pattern is determined to be I, and the number of pulses of the needle thread is 20, Assuming that the number of pulses for the upper louver thread is 40 and the number of pulses for the lower looper thread is 42, the corresponding stitch pattern is determined to be X■. Note that the stitch patterns ■ and The number of pulses shown in the above-mentioned auxiliary table uses a reference value within the range that results in the same stitch pattern, and each pulse value can be changed by operating the operation keys 30. The stitch pattern determined is determined based on this stitch pattern determination table.

The above-mentioned hem stitch pattern number, zone order, number of stitches, number of pulses for the needle thread, upper looper thread and lower louver thread, and stitch pattern are classified in the control content display section 20 as shown in FIG. Seven display sections 2
They are displayed at 0a to 20g, respectively. However, for zone rankings other than the edge stitching pattern number, the first ranking is displayed.

As shown in FIG. 1, the reading and setting of the above values is performed using the operation key part 30, which consists of a large number of keys provided below the display section 20. It has a registration key 31, pattern number increase/decrease keys 32, 33 for increasing/decreasing the hem stitch pattern number, and an execution key 34 for counting the stitch movement of the sewing machine. Movement key 3
5°36, with display value increase/decrease keys 37 and 38 located at the top and bottom.

The control operation by the apparatus shown in FIG. 2 configured in this way will be explained below.

FIG. 7 is a flowchart showing the control operation.

First, when the program is started by turning on the power, etc., initialization is performed in step S1, and both a zone ranking flag J and a stitch number flag K, which will be described later, are set to O, and then, input is accepted in step S2. At this time, if any of the above-mentioned cursor movement keys 35, 36, registration key 31, execution key 34, pattern number increase/decrease keys 32, 33, display value increase/decrease keys 37, 38 is operated, then step S3 to check which key was operated.

Note that at this time, the control content display section 20 displays the last controlled content in a predetermined display section.

If the displayed control content is acceptable, the execution key 34 may be pressed in that state. Then, the process advances to step S4, and the displayed control details are stored in the RAM.
103 in a predetermined area (different from the execution area), and then when the front edge of the cloth is detected by the sensor (S5),
Proceeding to step S6, hand movement management, which will be described later, is performed.

When changing the control content displayed on the control content display section 20, it is performed as follows. For example, in order to change to another hem stitch pattern, pattern NO increase/decrease key 32.3
If 3 is pressed, the process proceeds to step S7, where the currently displayed hem stitch pattern number is incremented or decremented to the value set by the key. Then,
The registered content corresponding to the set hem stitch pattern number is read out to the execution area (S8), and the hem stitch pattern number, the first step of the pattern number, the needle thread, upper looper thread, and After each pulse number of the lower looper thread is displayed in the display sections 20a to 2Of of the display section 2o (S9), the process proceeds to step Sll, and the stitch pattern determined by each pulse number of the needle thread, upper looper thread, and lower looper system is displayed. It is read out and graphically displayed on the display section 20g of the display section 20 (S12).

In addition, if you want to individually change the display contents of the number of pulses, zone order, and number of stitches for the needle thread, upper louver thread, and lower looper system, press the cursor movement keys 35 and 36 and move the cursor to the location you want to change. move it. At this time, the process advances to step S13, and the cursor moves laterally across the five display sections 20b to 20f of the control content display section 20.

Then, press the display value increase/decrease key 37 or 38 to set the desired value. In this case, the process proceeds to step SIO, where the displayed value is incremented or decremented to the set value, and then the stitch pattern is patterned based on the stitch pattern determination table shown in FIG. 4 and the reset value. 5ll) and display the stitch pattern in the display section 20g.

When controlling with the settings set in this way,
All that is required is to press the registration key 31, and the contents are stored by the key operation (S4). Then, after the execution key 34 is further pressed, the cloth is fed in and the cloth sensor is activated (S5).
, the hand movement management in step S5 is performed.

This hand movement management is performed as shown in FIG.

First, proceeding to step S211, the data of the stored hem stitch pattern is set in the execution area, and then the flags J and K are changed from the initialized 0 to 1 (
S22, 523), the process proceeds to step S24 and counts the movement of the hands.

This hand movement will be explained by taking as an example the edge stitching pattern Nol shown in FIG. 3(b). First, the first step
Start sewing the stitches. In this first stitch, when the number of pulses from the rotary encoder reaches 0, the gripping solenoids 15 to 17 are turned off to supply the thread, and when the number of pulses reaches 10, the needle thread gripping solenoid 15
is turned on, and then when the number of pulses reaches 35.41, the end solenoids 16. and 16. The gripping solenoid 17 for the lower looper yarn is turned on to stop the supply of each prefecture one by one.

When the first stitch is sewn in this way, it is determined in step S26 whether or not K in the first zone ranking (J=1) matches K1%aX, exactly 5. In this case, it is determined that they do not match yet. , the process proceeds to step S27, where K is turned 17 and the second stitch is started.

In the case of this second stitch, the predetermined number of pulses (1
0, 35, 41), the grip solenoids 15 to 17 are sequentially switched from OFF to ON, and then K is increased by 1 to 2.

Then, when the same thing is repeated five times, step S2
At 6, it is determined that =□, (=5), and the process proceeds to step 32B. Since J for the zone ranking does not match JllllX, that is, 5 in this case, step S29
Proceed to and set J from the initialized value 1 to 2. As a result, sewing for the second zone is started.

In this second zone, first, when the number of pulses from the rotary encoder reaches O set, the gripping solenoids 15 to 17 are turned off to supply the thread, and when the number of pulses reaches 10, the gripping solenoid 15 for needle thread Turn on and
Next, when the number of pulses reaches 35.41, the end solenoid 17 for the lower looper yarn is turned on, and the gripping solenoid 16 for the upper louver light is turned on to sequentially stop the supply of each prefecture.

When the first stitch of the second zone is finished sewing as shown in step 2,
K in the second zone ranking (J=2) in step S26.
It is determined whether or not it matches □8, that is, 4. In this case, since it does not match yet, the process proceeds to step S27 and K
1 up and start the second stitch. Then, when the same thing is repeated four times, in step S26, = is obtained.
(=4) and proceeds to step 328, and since J for the zone ranking does not match J□8, that is, 5 in this case, proceeds to step 329 and changes J from 2 to 3.
Set to . As a result, sewing for the third zone is started.

When sewing the third zone is repeated three times in this state, J changes from 3 to 4 and sewing begins in the fourth zone.
When the sewing of the zone is repeated 4 times, J changes from 4 to 5 and the sewing of the 5th zone starts. When the sewing of this 5th zone is repeated 5 times, J matches 5 of J ma Proceeding to step S30, J is set to 1 again and the process is repeated sequentially starting from the first zone.

In this way, the edge stitching pattern is formed, and then, when the trailing edge of the cloth is detected by the cloth sensor, step 33
Proceed to step 1, stop the sewing machine, and return.

FIGS. 9 and 10 show an example of an edge stitch pattern based on the present invention formed by appropriately determining the setting values of the auxiliary table shown in FIG. 3(b).

In addition, in the above embodiment, the case where there is one needle thread and two looper threads is explained as an example, but the present invention is not limited to this. It can be carried out in the same manner even if there is one or three or more.

As described in detail above, in the case of the present invention, the execution means selects the sewing machine based on the combination order of the stitch patterns and the thread amount ratio of the stitch patterns for the hem stitch pattern selected by the selection means. Since it is driven to adjust the supply amount for each prefecture, it is possible to drastically change the yarn amount ratio to form a variety of patterns, and it also improves workability without using the conventional cam. It has an advantage of 4° in terms of performance, and further has the advantage that the stored data can be rewritten using a rewriting means.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a sewing machine equipped with a hem stitch pattern forming device according to the present invention, FIG. 2 is a block diagram showing a control section of the device of the present invention, and FIG. Figure 4 shows the basic table and auxiliary table, Figure 4 shows the stitch pattern determination table, Figure 5 (a) to (
o) is a perspective view showing various stitch patterns, FIG. 6 is a front view showing the control content display section of the device of the present invention, and FIGS. 7 and 8.
The figure is a flowchart showing the control operation of the device of the present invention, FIGS. 9 and 10 are perspective views showing an example of a hem stitch pattern formed by the device of the present invention, and FIG. 11 shows a conventional hem stitch pattern forming device. It is a schematic diagram.箪2 Diagram TI...Needle thread, T2...Upper looper thread, T3...
Lower looper thread, 10... Edge stitching pattern forming device, 3o.
...Part of the operation keys, lOO...control section. Figure 3 (Sleeve shift) Figure 4 Figure 5 Figure 5 (b) Figure 5 (a) Figure 5 (C) Figure (d) Figure (f) Figure 5 (e) Figure 5 Figure (h) T2 Figure 5 (j) Figure 115 (i) Figure (k) Figure (Q) Figure 5 (n) Figure 5 (m) Figure 5 (0) Figure 8 Figure 10 Figure 9 Figure 11] 12

Claims (2)

[Claims] (1) In a hem stitch sewing machine equipped with a thread supply device that pinches the sewing thread with a rotating roller and supplies the amount of thread necessary to form one stitch according to the amount of rotation of the rotary roller, data regarding the hem stitch pattern is stored. , the combination order of stitch patterns for one cycle of the hem stitch pattern, the number of stitches in each stitch pattern, and the thread amount ratio of needle thread and looper thread for each stitch pattern, which are stored separately for each different hem stitch pattern. a selection means for selecting one of the plurality of hemline stitching patterns stored in the storage means; and a selection means for reading data regarding the selected hemline stitching pattern and performing sewing based on the data. A hem stitch pattern forming device for a hem stitch sewing machine, comprising: an execution means for repeatedly performing an operation; and a thread supply device. (2) The hem stitch pattern forming device for the hem stitch sewing machine equipped with the thread supply device according to claim 1, further comprising a rewriting means for rewriting data regarding the hem stitch pattern stored in the storage means. Equipped with an edge stitch pattern forming device for an edge stitch sewing machine.