CN1127589C - Sewing machine capable of electronic zigzig overlocking - Google Patents

Abstract

The object of the present invention is to provide an electronic zigzag lockstitch sewing machine capable of performing lockstitch in a prescribed pattern prior to the needle swing pattern or following the needle swing pattern. It has: a device for memorizing the needle pendulum pattern specified by the zigzag stitch and the overlock stitch pendulum style at the beginning or end of sewing; a device for inputting the repeat times of the overlock stitch pendulum pattern; according to each stitch pendulum A device for determining the number of overlock stitches or overlock stitches and the number of repetitions of overlock stitches; a control device that reads overlock stitch pendulum pattern data and forms overlock stitches according to the pattern , and make the main motor and the needle pendulum mechanism act so that the lockstitch ends when the number of lockstitch stitches or the number of lockstitch drops is reached.

Description

Electronic Zigzag Lockstitch Sewing Machine

The invention relates to an electronic zigzag lockstitch sewing machine, which forms zigzag stitches on the cloth through a cloth feeding device, a needle and a needle pendulum mechanism, wherein the cloth feeding device has a feeding mechanism that moves in and out on the needle plate to feed the cloth. Cloth teeth, the needle moves up and down in conjunction with the sewing machine main shaft rotated by the main motor, and the needle swing mechanism makes the needle swing in a direction intersecting the cloth feeding direction.

In the conventional zigzag lockstitch sewing machines, although the above-mentioned pendulum mechanism is operated to form the prescribed pendulum pattern by the pendulum cam which is rotated in conjunction with the main shaft of the sewing machine, when there are many pendulum patterns, it is necessary to make corresponding needle pendulum patterns. The corresponding pin pendulum cam, therefore, has brought problems such as cam exchange operation trouble and increased cam manufacturing cost.

For this reason, in recent years, known electronic zigzag lockstitch sewing machines are driven by pulse motors, use data to store needle swing patterns, and control the needle swing amount according to the read needle swing pattern data.

However, for conventional electronic zigzag lockstitch sewing machines, it is impossible to create new data while changing the stitch pendulum pattern in the sewing machine. It is necessary to have a separate preparation data creation device, and it is necessary to have a data creation device while changing. The function of this data creation device will use input devices such as coordinates or a personal computer, therefore, the adaptability of this sewing machine is poor.

In addition, in the conventional electronic zigzag lockstitch sewing machine, in order to prevent the stitches from being unraveled at the beginning of sewing or at the end of sewing, locksewing is performed. The lockstitch pattern at the beginning or end of the seam pattern. Because sewing is performed according to the number of stitches at the beginning or end of the overlock, if the position of the stitch at the beginning or end of the overlock does not become the desired position, when moving from the overlock to the normal zigzag seam, or from the normal zigzag When the shape seam moves to the lock seam, the needle pendulum position deviates, and the sewing quality will decrease.

In addition, as a lockstitch pattern, since a so-called zigzag pattern cannot be changed into a different pattern in the pendulum pattern, the flexibility of this sewing machine is poor.

In addition, in the prior art, due to sewing according to the set number of overlock stitches, the overlock start position or end position becomes an unfavorable position. When moving from overlock to normal sewing, or normal sewing When lockstitching is performed after sewing, the stitch position will deviate and the sewing quality will deteriorate.

Especially when changing the stitch pattern prior to the zigzag stitch or changing the lockstitch stitch continued after the zigzag stitch into the stitch pattern, the lock related to the lockstitch pattern must be set. Lockstitch parameters such as the number of stitches or the number of lockstitch stitches also have the problem of poor setting and reduced sewing quality.

In view of the above-mentioned problems, an object of the present invention is to provide an electronic zigzag lockstitch sewing machine which can perform lockstitch in a simple way and according to a prescribed pattern accurately prior to or following the needle swing pattern.

In the electronic zigzag lockstitch sewing machine of the present invention, through the cooperative action of the needle, the cloth feeding device and the needle pendulum mechanism, after the needles are moved in the direction intersecting the needle and the cloth feeding direction according to the prescribed number of stitches, then In the reverse direction, according to the specified number of stitches, the needles are swung to form zigzag stitches, wherein the needles move up and down in conjunction with the main shaft rotated by the main motor, and the cloth feeding device has the ability to move in and out on the needle plate to feed The feeding dog of the cloth, the needle pendulum mechanism makes the needle swing in the direction crossing the cloth feeding direction, and is characterized in that it has a needle pendulum pattern specified for the zigzag stitch and formed by the above specified needle pendulum pattern. A device for memorizing the lockstitch pendulum pattern formed by sewing the zigzag stitch at the beginning or the end of sewing the zigzag stitch of the pendulum pattern; a device for inputting the repeat times of the lockstitch pendulum pattern ; Calculate and determine the number of overlock stitches or the number of overlock stitches according to the number of stitches or the number of stitches in each stitch of the overlock pattern and the number of repetitions of the input pendulum; and control device, the control device reads the lock seam pattern data and forms a zigzag stitch according to the pattern, and makes the main motor and the needle pendulum mechanism act so that it can achieve the calculated number of lock seam stitches or lock seam fall The number of stitches is to end the shape of the lockstitch.

In this configuration, since the lockstitch is carried out according to the prescribed needle pendulum pattern, and the number of needle swings of the needle pendulum pattern during lockstitching is set, and the number of stitches in each stitch swing in the needle pendulum pattern is determined by the number of times and the needle swing pattern. The number of stitches during lockstitching is determined. Therefore, compared with the case of setting the number of stitches separately, there will be no sewing deviation when shifting between the normal stitch pattern and the stitch pattern during lockstitching, which can improve the sewing efficiency. quality.

In addition, in the electronic zigzag lockstitch sewing machine of the present invention, through the cooperative action of the needle, the cloth feeding device and the needle swing mechanism, after the needle moves in the direction intersecting the needle and the cloth feeding direction according to the specified number of stitches, the On the opposite side of the crossing direction, the needles are swung according to the specified number of stitches to form zigzag stitches. The needles move up and down in conjunction with the main shaft rotated by the main motor. With the feed dog for feeding cloth, the needle pendulum mechanism makes the needle pendulum in the direction crossing the cloth feed direction, and is also characterized in that it has: the needle pendulum pattern specified by the zigzag stitch and formed by A device for memorizing the lockstitch pendulum pattern formed by sewing zigzag stitches of the aforementioned prescribed pendulum pattern at the beginning or end of sewing zigzag stitches; A device for inputting the number of overlock stitches or the number of overlock stitches; when the input number of overlock stitches or overlock stitches is within the stitch number or the number of overlock stitches in each stitch swing of the overlock pendulum pattern When it is not an integral multiple, a device for correcting the number of overlock stitches or the number of overlock stitches to an integral multiple; and a control device, which reads the overlock pattern data and forms the overlock pattern according to the overlock pattern data. Stitch, make the main motor and the needle pendulum mechanism act, so that when the number of the corrected stitches or the number of falling needles is reached, the overlock seam can be ended.

In this configuration, when setting the number of overlock stitches, the overlock stitches are corrected without stopping during the needle swing. Sewing deviation will not occur, and the sewing quality can be improved.

In addition, in the electronic zigzag lockstitch sewing machine of the present invention, through the cooperative action of the needle, the cloth feeding device and the needle swing mechanism, after the needle moves in the direction intersecting the needle and the cloth feeding direction according to the specified number of stitches, the On the opposite side of the crossing direction, the needles are swung according to the specified number of stitches to form zigzag stitches. The needles move up and down in conjunction with the main shaft rotated by the main motor. With the feed dog for feeding cloth, the needle pendulum mechanism makes the needle pendulum in the direction intersecting with the cloth feed direction, and is characterized in that it also has: the needle pendulum pattern specified by the zigzag stitch and formed by A device for memorizing multiple lockstitch pendulum patterns formed by sewing zigzag stitches of the aforementioned zigzag stitches at the beginning or end of sewing; A device for storing parameters; a device for selecting a required overlock pendulum style from the plurality of overlock pendulum styles; The motor and needle pendulum mechanism are the control device for locking seam.

In this configuration, since the optimum number of times of overlock or the number of overlock stitches is set for each sewing condition of each pattern corresponding to a plurality of overlock patterns, it is automatically set when the overlock pattern is changed. The optimal lockstitch parameters corresponding to the lockstitch style are obtained, and high-quality lockstitches are realized.

Fig. 1 is a perspective view showing an overview of the electronic sewing machine of the present invention.

Fig. 2 is a configuration diagram showing the general configuration of the needle pendulum mechanism.

Fig. 3 is a block diagram showing a control structure of the electronic sewing machine.

FIG. 4 is a layout diagram showing various switches and displays of the operation panel.

Fig. 5 is an explanatory view showing stitches of various pendulum patterns.

Fig. 6 is an explanatory diagram showing various kinds of unique data of a pendulum pattern.

Fig. 7(A) is an explanatory diagram showing the inherent data of the stitch pattern; (B) is an explanatory diagram showing the stitches when the overlock pattern and the stitch pattern are the same; (C) is an explanatory diagram showing the stitches when the overlock pattern and the stitch pattern are different An explanatory diagram of .

Fig. 8 is an explanatory view showing stitches when the lockstitch pattern is different from the stitch pattern.

Fig. 9 is a flow chart showing the setting of the lockstitch start pattern.

Fig. 10 is a flowchart showing the setting of the number of times of lockstitching.

Fig. 11 is a flowchart showing a custom pattern for setting a lockstitch start.

Fig. 12 is a flowchart showing a custom pattern for setting an end lock stitch.

Fig. 13 is a graph showing lockstitch patterns and pattern numbers.

Fig. 14 is a flowchart showing a lock stitch setting process using the number of lock stitches as a parameter;

Fig. 15 is a flowchart showing a lock stitch setting process using the total number of stitches of lock stitch as a parameter;

Fig. 16 (A) is a chart listing the relationship between each lock seam pattern and the lock seam parameter corresponding to each lock seam style, (B), (C), and (D) represent when the lock seam is carried out according to the table (A) Stitch illustration.

Fig. 17 is a flow chart showing the operation at the time of finishing the lock stitching.

In the accompanying drawings, reference numeral 2 denotes a needle bar, 3 denotes a needle, 6 denotes a dial, 7 denotes a compact sewing dial, and 11 denotes a needle pendulum motor.

Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings.

[overall composition]

1 shows an overview of the electronic zigzag lockstitch sewing machine of the present invention. In this figure, a main motor 1 that rotates a main shaft moves a needle 3 up and down, and the needle 3 is supported on a needle bar 2. As shown in FIG. The feed dog of the cloth feed device moves in and out on the needle plate 4 in conjunction with the vertical movement of the needle 3 . As a result, the cloth pressed against the platen 5 is fed and moved in conjunction with the amount of cloth feeding to form stitches on the cloth. The sewing feed amount of the cloth can be set by the dial 6, and the locking seam performed at the beginning or end of sewing is set by the dense seam dial 7, and according to the set cloth feed It is carried out by driving the cloth feeding device. As for the dense stitching feed amount, the forward feed amount and the reverse feed amount of the same amount can be set to zero, and as the usual setting amount, it can be a small feed amount or a zigzag stitch feed amount. At this time, the back stitch can be performed by operating the back stitch lever 8 or driving the back stitch solenoid (not shown in the figure) during lockstitching to switch the amount of cloth feeding. In addition, 9 is a power switch, and 10 is an operation panel for performing various settings as will be described later.

In the electronic zigzag overlock sewing machine of the present invention, a needle swing mechanism as shown in FIG. 2 is provided. The link device 12 synchronizes the needle bar 2 supporting the needle 3 with the cloth feeding action of the cloth feeding device and moves back and forth in a direction (arrow direction in Fig. 2 ) intersecting with the cloth feeding direction. (for example, a stepping motor or a servo motor) 11 drives. Thereby, stitches of a predetermined pendulum pattern can be formed. On the pendulum mechanism, a home position sensor 13 for detecting the shielding plate 11a is provided to detect the home position of the pendulum position, and the shielding plate 11a rotates together with the rotation of the pendulum motor 11 .

A block diagram of a control system for an electronic zigzag overlock sewing machine is shown in FIG. 3 . The pedal command 20 drives the main motor 1 through the sewing machine rotation control circuit 21 and the sewing machine main shaft drive circuit 22, thereby driving the main shaft of the sewing machine, and the feeding dog performs the so-called four-link feeding movement, which is set according to the feeding dial 6 Feed the cloth with the cloth feeding amount, and at the same time, make the needle 3 move up and down to form stitches. The synchronizer 23 detects the position of the main shaft, detects each stitch, and simultaneously detects the upper position and the lower position, and then inputs its signal into the sewing machine rotation control circuit 21 and the needle swing control circuit 24. The needle swing control circuit 24 drives the needle swing motor 11 by means of the needle swing drive circuit 25, receives the signal from the home position sensor 13, and then controls the needle swing mechanism. During lock stitching, the back stitch solenoid 27 acts, and forms the set cloth feeding amount according to the intensive sewing dial 7 . As will be explained below, various data required for sewing machine control can be set through the operation panel 10, once these data are stored in the memory 26 as required, according to these set data, and according to the dial 6 And the data set such as intensive stitching dial 7 just can control the rotation of sewing machine main shaft, and then, control needle pendulum mechanism.

[operation panel]

Next, various switches and displays provided on the display panel 10 will be described with reference to FIG. 4 .

41 is a setting switch (SW), and is a switch for performing various settings such as setting mode switching. The switch 42 is a overlock start switch for setting [YES/NO], and when this switch is operated, the overlock start display LED (light emitting diode) 42a blinks on and off. In addition, the switch 43 is a stop-bath switch for setting the stop-bait [yes/no], and when this switch is operated, the stop-batch display LED43a blinks on/off.

44 is a half needle (or one needle) switch, which is a switch to make the sewing machine do half needle (or one needle) action. 45 is a thread trimming prohibition switch, which is a switch for instructing lockstitching without thread trimming when the pedal is stepped backward. Once the switch is operated, the thread trimming prohibition display LED45a lights up, indicating that the thread trimming prohibition is valid.

The pendulum display 48 has segment displays 48a, 48b, 48c, and 46 is a switch to make the display value of the display 48a of the display 48 be +, -, and the display 48a displays two digits. When the overlock start switch 42 is operated when [A] is displayed under the LED 42a, the overlock count setting at the start overlock can be changed. 47 is the switch that makes the first display 48b on the display 48 display the numerical value as +,-, under the situation that the lock seam switch 43 is operated when it is displayed as [B] under the LED43a, the number of times of lock seam can be changed to terminate the lock seam. Certainly. The first and second digit displays 48a and 48b are used to display the setting of the needle swing width or the number of stitches. When the LEDs 50a to 56a and 60a are displayed as [C] and each switch is operated, the needle swing width can be changed. or the setting of the number of stitches. In addition, the displays 48a, 48b, and 48c display the three-digit baseline position set by operating the baseline switch 61, and the baseline switch 61 is displayed as [D] under the LED 61a.

49 is a pendulum pattern linear stitch selection switch, once the switch is selected, the linear stitch display LED 49a lights up, indicating that the linear stitch is selected as the pendulum pattern. The 2-point zigzag switch 50 is a switch for selecting a 2-point zigzag stitch of a pendulum pattern. Once the switch is operated, the 2-point zigzag stitch is selected as the pendulum pattern, and the 2-point zigzag display LED50a lights up. In addition, the 3-point zigzag switch 51 is a switch for selecting a 3-point zigzag stitch of a pendulum pattern. Once the switch is operated, the 3-point zigzag stitch is selected as the pendulum pattern, and the 3-point zigzag display LED51a lights up. In addition, the 4-point zigzag switch 52 is a switch for selecting the 4-point zigzag stitch of the pendulum pattern. Once the switch is operated, the 4-point zigzag stitch is selected as the pendulum pattern, and the 4-point zigzag display LED52a lights up.

The left crescent-shaped switch 53 is a switch for selecting the left crescent-shaped stitch of the needle pendulum pattern. Once the left crescent-shaped stitch is selected as the needle pendulum pattern, the left crescent-shaped display LED53a light is on. In addition, the right crescent switch 54 is a switch for selecting the right crescent stitch of the pendulum pattern, and when the right crescent stitch is selected as the pendulum pattern, the right crescent display LED 54a lights up. The left blind seam stitch switch 55 is a switch for selecting the left blind seam stitch of the needle pendulum style. Once the left blind seam stitch is selected as the needle pendulum style, the left blind seam stitch display and LED55a light are on. The right blind stitch switch 56 is a switch for selecting the right blind stitch of the pendulum pattern. Once the right blind stitch is selected as the needle pendulum pattern, the right blind stitch display LED56a light is on. The customized pattern switch 57 is a switch for selecting a pendulum pattern for customizing sewing. Once the custom pattern is sewn as the needle pendulum pattern, the custom pattern display LED55a light is on.

The stop position designating switch 58 is a switch for designating the needle stop position at the center of the pedal. When the left stop, the left stop indication LED58a light is on. When the right stop, the right stop indication LED58b light is on. When any stop, both LED58a and LED58b are turned off.

The detailed setting switch 59 is used in combination with the setting switch 41, and the detailed setting is performed by the setting switch 41. When this switch is operated, the detailed setting display LED D59a lights up. When setting the number of crescent-shaped blind stitches, use the number of stitches setting switch 60, and when setting the number of stitches, the number of stitches setting display LED60a light is on. Also, the baseline switch 61 is used to change the baseline position, and the baseline position display LED 61a lights up when the baseline position is set.

62 is an end thread counter reset switch, which is used to reset the end thread (number of stitches) counter of the sewing machine. The off-line counter [+] [-] switch 63 is a switch for setting a count value to the counter. The counted value is displayed on the offline counter display 64, and the display 64 is provided with four segment displays 64a-64d.

[needle pendulum specifications]

In the electronic zigzag sewing machine of the present invention, there are straight stitch, 2-point zigzag, 3-point zigzag, 4-point zigzag, crescent, blind stitch, and custom-made patterns as the needle swing patterns. As shown in Fig. 5(A) , the straight stitch is a style in which the stitches are stitched at the base line position without weaving, so the weaving width (NW) is zero. As shown in Fig. 5(D), the 2-point zigzag is a sewing method in which the base line is used as the basis for 1 needle swing and the needle falls at 2 points on the left and right according to the needle swing (NW). As shown in Figure 5(E), the 3-point zigzag is a sewing method in which the base line is used as the base line, and the stitch width is 1/2 of the needle swing (NW), and the stitches fall on the left, center, and right 3 points. As shown in Figure 5(F), the 4-point zigzag is based on the baseline, and the stitch width is 1/3 of the needle swing width (NW). The stitches fall on the left, the center 2 points, and the right, a total of 4 points. .

As shown in Figure 5(B), the crescent shape is a crescent-shaped pattern stitch that is sewn with 12 stitches or 24 stitches in two circular arcs. According to the type of needle movement, there are three types: [standard · crescent shape · equal]. In addition, the direction of the arc is a left and right crescent shape. The left and right regulations are that the inside of the sewing machine is the right, and the upper side of the arc top is located on the inside. At this time, it is called the right crescent shape, and vice versa, it is called the left crescent shape. As shown in Figure 5(C), blind stitching is such a sewing method, that is, straight-line sewing is performed at the beginning of sewing, and the last 2 stitches of the number of stitches are stitched according to the needle swing width (NW), and the last stitch is repeated. Back to the original position, this pattern is repeated. At this time, carry out left and right blind stitching according to the needle pendulum direction. Right (left) blind hem stitch is a pattern in which the needle swings from a straight stitch to the right (left). Furthermore, the customized pattern is an original pattern made arbitrarily.

[Inherent data]

Among the above-mentioned needle swing patterns, there are needle swing width (NW), baseline position (NP), baseline reference position (NPs), stitch start position (NS), stitch end position (NE), stitch number (NC ) these inherent data.

The stitch width (NW) indicates the stitch width in each stitch pattern. For example, as shown in FIG. 6(A), 1 stitch width (NWS) is 1/3 of the needle swing width (NW) in a 4-point zigzag. That is, NWS=NW/3. At this time, when the remainder is obtained from the divided value, it is equally distributed on the left and right with the center position of the needle swing width as the reference. When NW is 5.0, NWS=1.6 and 0.2. Therefore, the first stitch is 1.7, the second stitch is 1.6, the third stitch is 1.7, and each stitch is 1.7, 1.6, and 1.7 in turn when returning. In addition, for example, the stitch swing width in the case of a crescent shape is the pattern width, and the stitch swing data is used for the stitch swing, and the stitch swing data is defined by equal divisions at the center. According to the pattern, there are 24 stitches and 12 stitches of data, and the calculation of the needle movement position is carried out according to the formula NDp=NP+(NW×NDn/8.2), where NDn is the needle movement data, NDp is the needle movement position, and NP is the baseline position.

As shown in Figure 6(B), the baseline position (NP) can refer to the center of the sewing machine needle pendulum mechanism as [0], the inside of the sewing machine as [+] (right side), and the opposite side as [-] (left side). ) is the base point of the pendulum. Set within the range -5.0 to 0 to +5.0 that does not exceed the maximum stitch width (WPx).

As shown in Figure 6(C), the baseline reference position (NPs) indicates the baseline reference position when the needle pendulum can be set to [center reference equal division, right end reference pendulum, left end reference pendulum], and the initial setting is set to the center For the base line position (NP), specify the swing reference in the center, right, and left. For example, in a 2-point zigzag, when baseline position (NP)=0.0, needle swing width (NW)=3.0, and baseline reference position (NPs)=left, the needle swings between 0.0 and 3.0.

As shown in Fig. 7(A), the needle start position (NS) refers to the needle start position after the thread trimming is designated on the [right and left side], and the initial setting is the left needle start. Furthermore, in the crescent-shaped and blind seam stitches, although there are left and right, but in the right crescent-shaped and right blind seam stitches, the left needle position becomes the starting needle position.

The number of stitches (NC) refers to the number of crescent-shaped and blind seam stitches. When sewing crescent-shaped stitches, the standard is 24 stitches, and the crescent-shaped stitches are also 24 stitches, which are equal to 12 stitches and 24 stitches. Set between 3 and 250 stitches. The initial setting is that in crescent-shaped sewing, standard, crescent-shaped, and equal are 24 stitches, and blind stitches are 4 stitches.

In addition, the overlock pattern (also called tight seam pattern) formed at the start or end of the pendulum pattern is effective for each pattern of straight stitch, 2-point zigzag, 3-point zigzag, 4-point zigzag, and crescent. . The number of times of dense sewing, from the start of the needle to the return is one pattern, and it is carried out in pattern units, and the number of stitches can be set within 19 stitches. In addition, the amount of cloth feeding for intensive sewing is set by the dial 7 for setting the amount of cloth for intensive sewing. For example, in the case of a 4-point zigzag, as shown in FIG. 7(B), there can be 6 patterns, and there are 3 stitches in the one+ pattern, so the number of stitches is 18.

In addition, there are the following methods for selecting and setting lockstitch (concentrated stitching): the first method refers to the method of performing lockstitch using various patterns called needle pendulum patterns; the second method refers to custom-made lockstitch Setting, narrowing the needle swing range in the needle swing range (NW) to set the number of stitches, and the needle swings in the same direction during the needle movement in the needle swing range (NW); the third method is to use Method of lockstitching a custom pattern (original pattern).

The first is the method of lockstitching using different lockstitch styles of the so-called pendulum style. ), the number of dense stitches (CC), and the baseline position (NP), baseline reference position (NPs), stitch start position (NS) and the pendulum pattern are the same. For example, as shown in Figure 7(c), if the start lockstitch pattern is 4 points, the needle pendulum pattern is 2 points, and the end lockstitch pattern is 3 points zigzag as an example, then the start lockstitch pattern is 4 points Zigzag, the needle swing is CW1, and the number of intensive sewing is 3 times. The continuous needle pendulum pattern in this kind of lock seam is 2-point zigzag. In this case, after the start lock seam is finished, according to the needle pendulum style, it is not necessary to determine the starting position like 2-4 point zigzag. The needle swing is performed at the start point of the needle swing at the end position of the lockstitch. In addition, when the end position of the lockstitch pattern at the beginning does not coincide with the start of the needle swing pattern, a speed limit between stitches is imposed after the lockstitch is completed. The pattern of lockstitch termination is 3-point zigzag, the needle pendulum range is CW2, and the number of dense seams is 4 times. In this terminating lock seam, one stitch needs to be added to move from the pendulum pattern to the terminating lock seam pattern, so the number of dense stitches + 1 stitch is the number of dense stitches.

The second method is described below. As the second lockstitch custom setting, set the number of stitches by narrowing the stitch width within the stitch width (NW), and make the needle move during the needle movement within the stitch width (NW). swing in the same direction. According to the custom setting, for each start lockstitch and end lockstitch, you can set the start dense stitch width (CPs), the start dense stitch number (CNs), and the end dense stitch width ( CPe), the number of stitches of dense stitching at the end (CNe). It cannot be set when dense pitch × dense pitch stitches > needle swing width.

When the lockstitch pattern is 2-point zigzag, subtract the needle swing amount of the condensed pitch operation from the needle swing width as the moving stitch swing width (N1) of the normal stitch swing and the condensed pitch stitch swing. Traveling needle swing amplitude (N1) = needle swing amplitude (NW) - dense pitch (CP ^* ) × number of dense pitch needles (CN ^* ). When the lockstitch pattern is 3-point zigzag, if the needle swing minus the dense stitch pitch is less than 1 needle swing (NTs), it is taken as the traveling stitch swing (NTe). In the case of 3-point zigzag, if the needle swing minus the close stitch pitch operation stitch swing is greater than 1 needle swing (NWs), the needle swing after deducting 1 stitch of needle swing is taken as the moving stitch swing (NI), sequentially control the dense needle pitch adjustment, shifting needle swing, and 1-needle swing. The same goes for the 4-point zigzag. When the remainder (NN) after deducting the dense stitch width is greater than the swing width of 1 stitch, the remainder obtained by subtracting NN with the swing width of 1 stitch is used as the movement stitch swing width (N1), and its The quotient is taken as the number of stitches (NCn) for one stitch swing. The number of intensive sewing stitches is the number of remaining stitches after subtracting [the number of stitches with dense pitch + the number of shifting stitches + the number of remaining pattern stitches], and the number of stitches that can be used in the pendulum pattern. The pattern with dense pitch is also counted as one pattern.

Figure 8 illustrates 3 styles of starting lockstitch stitches by way of example.

[Lockstitch pattern setting]

The setting method of the start (end) lockstitch pattern is explained below.

FIG. 9 shows the flow for setting the start lockstitch pattern. In step S1, it is determined whether the setting switch (SW) 41 of the operation panel 10 and the detailed setting switch 59 are turned on at the same time. When turned on at the same time, the detailed setting LED 59a lights up (step S2). In step S3, when the start overlock switch 42 is turned on, the LED 42a lights up, and the overlock pattern number is displayed on the segment display 64d of the display 64 . On the display 48, when the overlock pattern numbers are 1 to 3, the stitch width is displayed (step S4).

In FIG. 13 , the pattern numbers displayed on the display 64 and the overlock patterns thereof are shown. The pattern number [0] indicates the same pattern as the pendulum pattern, and also the pattern with the same swing width as the zigzag stitch. Pattern numbers [1] to [4] are 2-point zigzag, 3-point zigzag, 4-point zigzag, and straight stitch patterns, respectively. Pattern numbers [5] to [9] are custom-made patterns (original patterns) for the aforementioned third lockstitch. At this time, the segment display 64a of the display 64 displays the pattern number, the segment display 64b displays [C] indicating that it is a customized pattern, and the segment displays 64c, 64d display the step number (corresponding to the step number and even the stitch number).

When the setting switch 41 is turned on in step S5 of FIG. 9, data corresponding to the display is stored in the memory 26 (step S6). When changing the style or swing, change the style by the off-line counter [+][-] switch 63 (steps S7, S8); S9～S11). Then, the changed pattern and swing width are stored in the memory by turning on the setting switch 41 (step S5, step S6).

The above is the setting of the start lock seam pattern. When setting the end lock seam style, step S3 judges whether the end lock seam switch 43 is turned on or not. Only in step S4, the light of the end lock seam LED43a is different. The settings are the same as those of the lockstitch start pattern.

FIG. 10 shows the flow of the lock stitch setting process for setting the number of lock stitches (the number of times of intensive sewing). When the setting switch 41 is turned on (step to S21), the needle pendulum pattern display 64 blinks (step to S22), and when the overlock switches 42 and 43 are turned on (step to S23), the needle pendulum pattern indicator lights up, and the overlock display The LEDs 42a, 43a blink (step to S24). In step to S25, when the lockstitch pattern number is 0-4 displayed in the display 64, since the number of times of lockstitch can be set, the lockstitch pattern setting parameter (step to S26) is processed.

In step S27, when the setting switch 41 is turned on, the data of each display is saved, and in step S28, the flickering of the overlock display LEDs 42a and 43a is terminated.

FIG. 11 shows the flow of starting a lockstitch pattern and setting its custom pattern under the aforementioned third custom pattern (original pattern). One manipulates the customized style switch 57 and starts the lock seam switch 42 (step S41), starts the lock seam LED42a light on (step S42); the setting switch is not connected (step S43), and the off-line counter switch 63 is connected (step S44) , the segment display 64a of the display 64 displays custom numbers [5] to [9], and the segment display 64b displays [C] (step S42). This display state is shown in the custom style sheet column of FIG. 13 . In addition, once the setting switch 41 is turned on (step S43), the number of steps (number of stitches) is displayed on the segment displays 64c, 64d of the display 64 [the reference list column of FIG. 13 ], and the needle drop position data is displayed on the display 48 (step S45).

In each operation switch of steps 46, 48, 52, and 54, it is monitored whether any one of the switches is operated. In step S54 , the number of steps is changed by operating the offline counter switch 63 to increase or decrease the number of steps. The changed step numbers are displayed on the segment displays 64c and 64d of the display 64 (step S55). In addition, the needle entry data in the number of steps can be set by operating the setting switch 46 in step S52, and can be displayed on the display 48 (step S55). Corresponding to the opening and closing of the thread trimming prohibition switch 45, the number of steps in the setting is used as the final step, and [E] is displayed in the segment display 48b of the display 48 (step S49), and by making the setting switch 41 turned on, the The data of the needle drop position in each number of steps set so far is memorized in the memory 26 .

In this way, by setting the number of steps and the data of the needle drop position in the number of steps, the needle drop position data of each needle can be formed, that is, the needle pendulum pattern, which can be stored in the memory 26 as a customized pattern.

In addition, steps S61 to S75 of FIG. 12 show the flow for setting the customized style of the end lock seam, which are basically the same as steps S41 to S55 of FIG. 11 respectively. In step S61, only when the end lock seam switch 43 The place where the LED 43a light is turned on in the switch 62 is different from step S41 and step S42 of FIG. 11 .

If the data input of the lockstitch pattern above is summarized, when the lockstitch style is [0], it is the same pattern as the needle swing pattern, and the needle swing width is also the same. . When the lockstitch pattern is [1]～[3], it is 2 o’clock to 4 o’clock zigzag pattern respectively, set whether to start lockstitch or end lockstitch, the needle swing width and the number of lockstitches are as shown in Figure 9 and Figure 10 The process is set. When the lockstitch pattern is [4], only the number of stitches is set because it becomes a straight stitch. When lockstitch pattern is [5]～[9], since it is a customized pattern, the position data of the entire needle part is input along the flow chart in Figure 11 and Figure 12. An example of the stitches when the overlock pattern and the weaving pattern are the same is shown in FIG. 7(B), and when the overlock and the weaving pattern are different, it is as shown in FIG. 7(c) or FIG. 8.

In the present invention, the setting of the overlock is basically carried out according to the overlock pattern selection and the set overlock parameters (the number of times of overlock, the number of overlock stitches). According to Figure 14, set the number of locking stitches with parameters.

In Fig. 14, as previously mentioned, when the setting switch 41 and the start lock seam switch 42 are turned on, the set number of times to start lock seam is displayed in the stitch display (step to S110).

Next, in step S111, when A (+) (-) switch 46 or B (+) (-) switch 47 is operated, the number of times of starting or ending lock stitching is changed into the set value of switch 46 or switch 47 (step to 112), the number of stitches S during the lockstitch is calculated by multiplying the number of stitches N in one needle swing of the lockstitch pattern by the number of lockstitches Pn (step S113). For example, when the stitch pattern at the start of lockstitch is 4-point zigzag, since the number of stitches in one needle swing of this pattern is 3, when the number of lockstitches is 3, the number of lockstitch stitches is 9. Likewise, the needle swing pattern at the end of overlock can be set.

Therefore, since the number of stitches in the lockstitch is determined from the product of the number of lockstitches in the lockstitch and the number of stitches in one stitch swing in the stitch pattern, it is different from normal sewing after the necessary stitches are finished in the lockstitch. Compared with the case of setting the number of stitches independently at the beginning, it is possible to prevent deviation of sewing.

From the above, in the setting of lockstitch parameters in step S26, take the number of lockstitches as a parameter to obtain the number of lockstitch stitches as an example. Set as a parameter. However, in this case, when the number of stitches is not an integral multiple of the number of stitches or the number of stitches in 1 stitch swing, the lockstitch stops halfway through the stitch swing, and seam occurs when moving to the normal stitch swing pattern. The sewing system deviates and the sewing quality is poor. Therefore, this must be corrected.

In FIG. 15 , the process of setting the lockstitch parameter when the total number of stitches in the lockstitch is used as a parameter will be described by taking the start of the lockstitch as an example. On the display 48a, the default correction value of the number of starting overlock stitches is displayed (step S120). In Fig. 15, since the number of stitches during the overlock is set, the number of stitches Sn when the overlock is started can be set with the A (+) (-) switch 46 in step S121. Next, in step S122, the number N of stitches of one heaving pattern at which the lock stitching starts is divided by the total number of stitches, and the quotient L and the remainder X are obtained. In step S123, under the situation of judging that the remainder X is 0, the setting stitch number Sn obtained in step S122 is used as the stitch number (step 124) of starting lockstitch; On the other hand, if the remainder is not In the case of 0, it is rounded up, and then (L+1) is multiplied by the number of stitches N, and the result is used as the number of stitches for lockstitching (step S125). For example, in the case where the pattern of stitches at the start of lockstitching is 4-point zigzag and the number of stitches is 8, since 8/3=2.6, the rounded number of lockstitches is 3, so the number of stitches is 9.

The above settings can also be used for the setting at the end of lockstitch.

In this way, since the set number of stitches can be corrected according to the integral multiple of the number of stitches in one needle swing of the needle swing, it will not shift from lockstitch to normal stitch pattern, and the sewing quality can be improved .

In addition, in the present invention, the number of times of overlock or the number of stitches during overlock is not manually set, but is automatically set along with the setting of the overlock pattern. For this purpose, the graph shown in Fig. 16 was made. For example, when performing a common needle pendulum pattern with a 2-point zigzag pattern, the lockstitch pattern corresponding to the needle pendulum pattern (2-point zigzag, 3-point zigzag, 4-point zigzag) is set multiple times, and the memory and The number of lockstitches at the beginning and end of each lockstitch corresponding to each lockstitch pattern is stored in the memory 26 as a table.

After selecting the needle pendulum pattern when overlocking according to Fig. 9 (in Fig. 16, since the beginning overlock and the end overlock are the same, it is fine to select either start or end), according to the table in Fig. 16A, the start is automatically read out. Number of lockstitches and number of end lockstitches. 16(B), (C), and (D) respectively show the state of sewing under the situation of selecting each 2-point zigzag, 3-point zigzag, and 4-point zigzag with respect to the lockstitch pendulum pattern. Figure 16(B) is the case of choosing 2-point zigzag after lockstitching. Since the number of times to start locksewing and end lockseam according to the table in Figure 16(A) is 4, each start and end lockseam are 2 points Repeat the zig zag pendulum 4 times. In addition, Fig. 16 (C), (D) shows the situation that 3 o'clock and 4 o'clock zigzag lockstitches are selected as the needle pendulum pattern; because the number of times of lockstitches at the beginning and end of the table according to Fig. 16(A) is respectively 3 times, so the needle pendulum pattern of 3-point zigzag and 4-point zigzag is repeated 3 times at the beginning and end of lockstitch.

The example of Fig. 16 (A) is for the situation that the common needle pendulum style is 2-point zigzag, and such a table can also be set for other common multiple needle pendulum styles respectively, and Fig. 16 (A) is made for each needle pendulum style respectively. ) shown in the table. In addition, even if the number of lockstitches is not used, parameter tables such as the number of lockstitches can also be memorized.

In this way, since the optimum number of times of overlock or the number of overlock stitches can be set for a plurality of overlock styles under the sewing conditions of each style, the overlock style can be changed and the optimum overlock can be automatically set. Lock seam parameters, can achieve high quality lock seam.

Fig. 17 shows a flow chart of overlock operation. In step S81, because it is judged that the pedal is stepped forward, when the start overlock switch 42 is turned on (step S82), the start overlock is performed, so the switch 63 is used to set the start overlock pattern number. Pattern numbering is that the judgment of [0]～[9] is carried out in step S83 and S84, is corresponding with respective pattern numbering, reads out from memory 26 and starts lockstitch pattern, makes needle 3 and The cloth feeding action of the cloth feeding device is synchronous, and at the same time reciprocatingly moves along the direction crossing the cloth feeding direction, thereby forming stitches corresponding to each pattern. At this time, when the overlock pattern is [0], the number of stitches N is the same as the number of stitches of the stitch pattern (step S85), and when the overlock pattern is [1] to [4], the number of stitches N is the number of stitches of the overlock pattern ( Step S86), when the lockstitch pattern is [5]-[9], the number of stitches N is the stitch number of the custom-set pattern (step S87). The speed is limited by N stitches (step S88), and the process proceeds to sewing of the pendulum pattern shown schematically in step S100.

After the needle swing pattern has been sewn, it is judged that the pedal is stepped on backward (step S91), and when the overlock switch 43 is turned on (step S92), the process goes to the overlock pattern sewing shown in steps S93 to S98. . Similarly, in steps S93 and S94, it is determined that the pattern numbers are [0] to [9], and corresponding to the respective pattern numbers, the finish lock stitch patterns are read from the memory 26 to perform finish lock stitch. At this time, when the lockstitch pattern is [0], the number of stitches M is the same as that of the stitch pattern (step S95), and when the lockstitch pattern is [1] to [4], the number of stitches M is the stitches of the lockstitch pattern number (step S96), the stitch number M is the stitch number (step S97) of custom setting pattern when lockstitch pattern is [5]～[9]. Speed limitation is performed with the M stitch (step S98), and when thread trimming is possible (step S99), thread trimming is performed in step S101, thereby making the action end.

In addition, the number of stitches and even the number of lockstitches (steps S86 and S96) of the lockstitch style under the situation of 1-4 are the numbers set or corrected according to Fig. 14 and Fig. 15, or can be automatically set according to Fig. set number.

In the above-mentioned embodiment, the number of stitches is set as the lock stitch pattern at the start and end of the lock stitch, but the number of drop stitches may also be set.

As described above, in the present invention, the number of stitches for lockstitching is determined based on the product of the number of stitches of the stitch pattern for lockstitching and the number of stitches for 1 stitch swing in the stitch pattern. Therefore, in the case of setting the number of single stitches, the normal sewing start position may deviate after the lockstitch ends in the middle of the needle swing. When normal sewing starts after the last lockstitch is finished, there will be no sewing deviation when shifting between the normal stitch pattern and the stitch pattern during lockstitching, and the sewing quality can be improved.

In addition, in the present invention, the number of stitches for lockstitching is set, and when lockstitching is performed according to the number of stitches, if the lockstitch stitch ends in the middle of the needle swing, it is automatically corrected to the Because of the number of stitches at the end of the stitches, there will be no deviation when shifting between the normal stitch pattern and the stitch pattern during lockstitching, and the sewing quality can be improved.

In addition, in the present invention, since the optimum number of times of overlock or the number of overlock stitches in each sewing condition can be set separately for a plurality of overlock styles, even when the overlock style is changed, the overlock can be automatically set. Set the most suitable lockstitch parameters to achieve high-quality lockstitch.

Claims (4)

1, a kind of electronic sawtooth overlock sewing machine, co-operating by pin and cloth-feeding device and needle swinging mechanism, behind the direction balancing point that needle tracking number in accordance with regulations intersects towards described pin and cloth feeding direction, described crisscross oppositely in accordance with regulations needle tracking number carry out balancing point and form saw-tooth stitch, wherein, described pin with move up and down by the main shaft interlock of main revolution, described cloth-feeding device has comes in and goes out on needle plate with the feed dog of work feed, described needle swinging mechanism makes described pin edge and the direction balancing point that cloth feeding direction intersects, and it is characterized in that having:

To making the device that eyelet pin pendulum-type sample that the saw-tooth stitch of beginning or sewing finishing forms is remembered by the pin pendulum-type sample of saw-tooth stitch regulation and by the saw-tooth stitch that is formed at aforementioned regulation pin pendulum-type sample;

The device that the pin pendulum number of repetition of the pin pendulum-type sample of described saw-tooth stitch eyelet is imported;

According to the pin pendulum number of repetition of the needle tracking number in the each pin of the described eyelet pin pendulum-type sample pendulum or fall pin number and described input eyelet needle tracking number or the eyelet pin number that falls is calculated definite device;

Control device is read described eyelet pin pendulum-type sample data and is formed the eyelet needle tracking according to this pattern, and makes main motor and needle swinging mechanism action, so that fall to finishing eyelet when pin is counted at eyelet needle tracking number that reaches described calculating or eyelet.

2, a kind of electronic sawtooth overlock sewing machine, co-operating by pin and cloth-feeding device and needle swinging mechanism, behind the direction balancing point that needle tracking number in accordance with regulations intersects towards described pin and cloth feeding direction, described crisscross oppositely in accordance with regulations needle tracking number carry out balancing point and form saw-tooth stitch, wherein, described pin with move up and down by the main shaft interlock of main revolution, described cloth-feeding device has comes in and goes out on needle plate with the feed dog of work feed, described needle swinging mechanism makes described pin edge and the direction balancing point that cloth feeding direction intersects, and it is characterized in that having:

To making the device that eyelet pin pendulum-type sample that the saw-tooth stitch of beginning or sewing finishing forms is imported and remembered by the pin pendulum-type sample of saw-tooth stitch regulation and by the saw-tooth stitch of the pin pendulum-type sample that is formed at aforementioned regulation;

To the eyelet needle tracking number in the described eyelet needle tracking style or the eyelet device that the pin number imports that falls;

Means for correcting when the eyelet needle tracking of being imported or eyelet needle tracking number or the fall pin number when not being integral multiple of pin number in each needle tracking amplitude of oscillation of eyelet pin pendulum-type sample that fall, is corrected into integral multiple to described eyelet needle tracking number or the eyelet pin number that falls;

Control device is read described eyelet pin pendulum-type sample data and is formed needle tracking according to this eyelet pattern, and main motor and needle swinging mechanism are moved, so as when to reach the described correction needle tracking number or the pin that falls and count to finish eyelet.

3, a kind of electronic sawtooth overlock sewing machine, co-operating by pin and cloth-feeding device and needle swinging mechanism, behind the direction balancing point that needle tracking number in accordance with regulations intersects towards described pin and cloth feeding direction, described crisscross oppositely in accordance with regulations needle tracking number carry out balancing point and form saw-tooth stitch, wherein, described pin with move up and down by the main shaft interlock of main revolution, described cloth-feeding device has comes in and goes out on needle plate with the feed dog of work feed, described needle swinging mechanism makes described pin edge and the direction balancing point that cloth feeding direction intersects, and it is characterized in that having:

To making the device that a plurality of eyelet pin pendulum-type samples that the saw-tooth stitch of beginning or sewing finishing forms are remembered by the pin pendulum-type sample of saw-tooth stitch regulation and by the saw-tooth stitch that is formed at aforementioned regulation pin pendulum-type sample;

The device that corresponding each eyelet parameter of each eyelet pin pendulum-type sample is remembered respectively;

The device of from described a plurality of eyelet pin pendulum-type samples, the eyelet pin pendulum-type sample of needs being selected; And

Thereby according to the eyelet pin pendulum-type sample of described selection and according to controlling the control device that main motor and needle swinging mechanism carry out eyelet with the corresponding eyelet parameter of this style.

4, electronic sewing machine according to claim 3 is characterized in that described eyelet parameter is eyelet number of times or eyelet needle tracking number.

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