CZ302879B6 - Method of making compressed stitches and electronic sewing machine for sewing zigzag stitch - Google Patents

Abstract

The invented method of making compressed stitches at the start or end of a common stitching by making use of an electronic sewing machine for sewing zigzag stitch comprises: calculation and acquisition of a number (S) of compressed stitches based on a preliminary recorded number (N) of stitches made during one needle (3) oscillating pattern of condensation stitching and a number (Pn) of the needle (3) condensation stitching operations being set from outside or the number (Sn) of compressed stitches being also set from outside; starting of a main motor (1) and a needle (3) swing mechanism to form compressed stitches in accordance with the predetermined needle (3) oscillating pattern of condensation stitching and starting of the main motor and the needle (3) swing mechanism for terminal formation of compressed stitches and for beginning common stitching when a calculated and acquired number (S) of compressed stitches is achieved. The present invention also relates to an electronic sewing machine for sewing zigzag stitch to make compressed stitches at the start and the end of a common stitching, wherein the said electronic sewing machine comprises among others a circuit (22) for driving a main shaft of the sewing machine and a circuit (25) for driving the needle (3) swing motion, said circuits being arranged for controlling a main motor (1) and a needle (3) swing mechanism in order to provide swing motion of the needle (3) to form compressed stitches in accordance with a predetermined pattern of the needle (3) swing motion for compressed stitching, and the main motor and the needle (3) swing mechanism arranged for providing the needle (3) swing motion for final formation of compressed stitches and for beginning common stitching after the determined number (S) of the compressed stitches has been achieved.

Description

A method for producing densified stitches and an electronic sewing machine for sewing with a zigzag stitch

Technical field

The invention relates to a method for producing densified stitches at the beginning and at the end of a conventional stitch by means of an electronic zigzag sewing machine.

The invention also relates to an electronic zigzag sewing machine for producing densified stitches at the beginning and end of a conventional stitch.

BACKGROUND OF THE INVENTION

In known zigzag sewing machines, the needle swing mechanism is actuated by utilizing a needle swing cam which is rotatably driven by engaging the sewing machine main shaft to form a predetermined needle swing pattern.

However, if a plurality of needle swing patterns need to be prepared, more than one type of needle swing cams corresponding to such patterns must also be provided. This leads to very demanding cam replacement tasks, causing problems in terms of increased production costs for the cams.

Also known is an electronic zigzag sewing machine in which needle swivel movement patterns are stored as data, driven by a pulse motor or similar device that controls and controls a plurality of needle swivels based on a read needle swivel pattern.

However, with this type of known zigzag stitch machine, it is impossible to change the needle swivel pattern or to create a new needle swivel pattern, which has to be prepared or changed using a coordinate input device, a personal computer or the like.

For this purpose, a data preparation device must be prepared separately, which has an adverse effect on its rapid applicability.

In known electronic zigzag sewing machines, the stitch pattern is further set at the beginning of or at the end of a predetermined zigzag stitch pattern by adjusting the number of start or end stitches so that the stitching is performed at or at the start of the stitching. end to prevent sutures from loosening.

This densified stitch pattern is formed in accordance with the number of stitches at the beginning or end of the densified stitch.

Therefore, the needle pivot position at the beginning or end of the densified stitching is shifted from the intended position, being shifted during the transition from the densified stitching to the normal zigzag stitching, or from the conventional zigzag stitching to the densified stitching.

As a result, the sewing quality is obviously deteriorated.

In addition, the needle pivot pattern cannot be set differently from the suture pattern by the zigzag stitch as the densified stitch pattern. As a result, the required flexibility cannot be achieved.

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In addition, the densified stitching was usually performed by adjusting a large number of stitches.

Therefore, when the start or end position of the densified stitching is shifted from the intended position, transitioning from densified stitching to normal stitching, or when the normal stitching is completed and then the densified stitching is performed, that sewing quality is deteriorating.

In addition, when a stitch pattern for a stitched needle is to be produced similarly before or after a stitch pattern, such as a zigzag stitch, it is necessary to set the stitch parameters such as the number of stitch operations or the stitch rate. due to the stitch pattern of the thickened needle.

This also caused problems in that this adjustment was not accurate, so that the sewing quality deteriorated.

SUMMARY OF THE INVENTION

In order to overcome the above problems, it is an object of the present invention to provide an electronic sewing machine capable of performing high-quality densified stitching in a predetermined pattern, either before or after the needle pivot pattern, very reliably and by a simple procedure.

The above object has been accomplished in accordance with the present invention by providing a method for producing densified stitches at the beginning and end of conventional stitching by an electronic zigzag sewing machine comprising a needle moving vertically and connected to a main shaft rotatably driven a main motor, a fabric feed device, including a fabric feeder for exiting the fabric feed needle plate, and a solenoid for switching the feed amount at the fabric feed device, and a mechanism for swinging the needle in a direction transverse to the fabric feed direction; steps:

calculating and obtaining the number of densified stitches based on a pre-recorded number of single stroke stitches for the densified stitch needle pattern and the number of external needle stroke repetitions or external stitch counts and starting the main engine; and a needle pivot mechanism for forming the densified stitches in accordance with a pre-recorded pattern of the needle stroke when the densified stitching is performed, and starting the main motor and needle pivot mechanism to end the densified stitches and start the normal stitching to reach the calculated and obtained number of densified stitches .

The method of the invention preferably further comprises the following steps:

correcting the number of densified stitches as a multiple of the integer number of stitches for a single needle swing for the ditch stitch pattern, if the input stitch number is not a multiple of the single stitch number for the single needle oscillation stitch for the ditch stitch pattern, and a motor and a needle pivot mechanism for terminating the formation of densified stitches to achieve a number of stitches that is corrected.

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The method of the invention further preferably also comprises the following steps:

selecting the desired ditch stitch motion pattern from the ditch stitch pattern and starting the main motor and needle swing mechanism based on the ditch stitch parameter selected for the ditch stitch pattern selected from the ditch stitch pattern condensed stitching.

Preferably, the stitch parameter is the number of stitch operations or the number of stitches.

In accordance with another aspect of the present invention, an electronic zigzag stitching machine has also been developed to produce densified stitches at the beginning and end of a conventional stitch comprising:

a needle for vertical movement coupled to the main shaft rotatably driven by the main motor, a fabric feed device comprising a fabric feeder for exiting the fabric feed needle plate, a mechanism for pivoting the needle in a direction transverse to the fabric feed direction and a feed quantity switching solenoid fabrics for the fabric feed device, memory for storing the swivel needle motion pattern and the number of stitches per needle swivel on the swivel needle pattern, the control panel for specifying the number of needle swivel repetitions for the swivel needle pattern, or the number of densified stitches, and a control circuit for controlling the pivoting movement of the needle to determine the number of densified stitches based on the recorded number of stitches in a single needle oscillation in the damping pattern of the densified needle, and a given number of needle swing repetitions or a specified number of densified stitches, wherein the sewing machine main shaft drive circuit and the needle swivel drive circuit are arranged to control the main motor and the needle swivel mechanism to provide the needle swivel movement to produce densified stitches and the main motor and needle swing mechanism are configured to provide the needle swing motion for the final formation of the densified stitches and to initiate the normal stitching after the specified number of densified stitches have been reached.

Preferably, the control panel is configured to enter the number of densified stitches in the swivel movement pattern of the densified stitch needle.

The needle swivel control control circuit is preferably arranged to correct the number of densified stitches as a multiple of the integer number of stitches in a single needle swing in the needle swivel pattern for the densified stitching if the specified number of densified stitches is not a multiple in the swivel motion pattern of the thickened needle.

The sewing machine main shaft drive circuit and the needle swivel drive circuit are preferably arranged to control the main motor and the needle swivel mechanism to provide the needle swivel movement to terminate the formation of densified stitches after the number of stitches being corrected.

The memory is preferably arranged to store the densified stitching parameters corresponding to the swivel movement patterns of the densified stitch needle.

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The control panel is preferably arranged to select the desired densified stitch motion pattern from the densified stitch needle pattern.

Preferably, the main motor and needle swing mechanism are configured to provide the needle swing motion in accordance with the densified stitch parameter corresponding to the selected needle stitch motion pattern for the densified stitch.

The memory is preferably arranged to store the number of densified stitch operations or the number and densified stitches as parameters of the densified stitching.

With the above construction, the densified stitching is performed with a predetermined needle pivot pattern, wherein the number of needle pulses of the needle pivot pattern for the densified stitch is set, and the number of densified stitches is determined by the number of needle pivot and stitches with one needle pivot width. swinging needle.

As a result, the suture does not shift during the transition from the conventional needle pivot pattern to the thickened stitch needle pattern. The quality of sewing is thus significantly improved.

With the above construction, if the number of stitches for the densified stitching is set, the stitches for the densified stitching are corrected so that they are not terminated in the center of the swing of the needle.

Therefore, the suture does not shift during the transition from the conventional needle swing pattern to the thickened needle stitch pattern. As a result, the sewing quality is significantly improved.

With the above construction, it is possible to set the number of densified stitch operations or the densified stitch number that is optimal for the sewing conditions for each densified stitch pattern.

Therefore, when the stitch pattern is changed, the optimum stitch parameter corresponding to the pattern is automatically set so that a high quality stitch can be performed.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will now be explained in more detail by way of examples of a specific embodiment thereof, the description of which will be given with reference to the accompanying drawings, in which:

Fig. 1 is a perspective view showing the appearance of an electronic sewing machine according to the present invention;

Fig. 2 is a side view showing schematically the structure of the needle swing mechanism;

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

Fig. 4 is a view showing the arrangement of various switches on the control panel and display unit;

Fig. 5 shows schematically an overview of stitches of various needle swivel patterns, Fig. 5A shows a straight stitch, Fig. 5B shows a wavy or serrated stitch, Fig. 5C shows a covered stitch, Fig. 5D shows a two-point zigzag stitch, Fig. 5E shows a three-point zigzag stitch, a

Fig. 5F shows a four-point zigzag stitch; Fig. 6 shows schematically various essential data of the needle swivel movement pattern, while Fig. 6A shows the swivel range of one stitch unit for a four-point zigzag stitch; Fig. 6B illustrates a base line position setting having a center reference of -2, 0 and +2; 6C depicts left, center, and right reference positions as baseline reference;

Fig. 7A shows a schematic view showing the essential data of the needle swivel pattern; Fig. 7B schematically illustrates the stitch obtained when the densified stitch pattern is the same as the swivel moving pattern; and Fig. 7C illustrates a schematic stitch obtained when the pattern is a densified stitch different from the swivel pattern;

Fig. 8 shows a schematic stitch obtained when the densified stitch pattern is different from the swiveling stitch pattern;

Fig. 9 is a flowchart showing the progress of setting the condensed stitch pattern origin;

Fig. 10 is a flowchart showing the setting of the densified stitching; Fig. 11 is a flowchart showing the process of setting a conventional pattern for the start of the densified stitching;

Fig. 12 is a flowchart showing a procedure for setting a conventional pattern for an end of densified stitching;

Fig. 13 is a table showing a densified stitch pattern display and a pattern number;

FIG. 14 is a flowchart showing a procedure for adjusting the densified stitching using a number of densely stitched operations as a parameter;

FIG. 15 is a flow chart illustrating the procedure for adjusting the densified stitching using the total number of densified stitches as a parameter.

Fig. 16A shows a table for storing the correlation between each densified stitch pattern and the densified stitch parameter;

Fig. 16B illustrates schematically an embodiment of a densified stitching in accordance with the table of Fig. 16A for a two-point zigzag stitch;

Fig. 16C illustrates schematically an embodiment of a densified stitching in accordance with the table of Fig. 16A for a three-point zigzag stitch;

Fig. 16D illustrates schematically an embodiment of a densified stitching in accordance with the table of Fig. 16A for a four-point point zigzag stitch; and FIG. 17 is a flow chart illustrating the flow of operations to perform a compacted stitch.

DETAILED DESCRIPTION OF THE INVENTION

An exemplary embodiment of the present invention will now be described in more detail below with reference to the above drawings.

FIG. 1 is a partial perspective view of an electronic zigzag sewing machine according to the present invention.

In FIG. 1, the needle 3 disposed on the needle bar 2 moves vertically and is driven by the main motor 1, which rotates the main shaft.

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In relation to the vertical movement of the needle 3, the dispenser (not shown in the figures on the fabric feeding device) appears on the suture plate 4, as a result of which the fabric pressed by the presser foot 5 is fed so that the fabric is stitched by cooperating with the a fabric feeding device.

The amount of fabric to be fed can be adjusted by means of a scaled feed roller 6, wherein the densified stitch at the beginning or end of the sewing operation is ensured by adjusting the amount of fabric to be densified by the stitched roller 17 and densified by the scaler. the amount administered.

The condensed delivery amount may be set to zero based on a return delivery amount that is the same as the conventional delivery amount, with the normally set amount being set to be very small for the zigzag stitch.

In this case, the reverse stitch lever 8 is operated or the reverse stitch solenoid, not shown, is actuated during the compressed stitch so that the feed amount can be switched and the reverse stitch can be performed,

Reference numeral 9 denotes a trigger switch, and reference numeral 10 denotes a control panel for performing various adjustment operations, as will be described in more detail below.

The electronic zigzag sewing machine of the present invention is provided with a needle swing mechanism as shown in FIG. 2.

The needle bar 2 carrying the needle 3 performs a reciprocating movement perpendicular (as shown by the arrow in Fig. 2) to the fabric feed direction, providing synchronization with the fabric feed using the fabric feed device through the linking mechanism 12 which is driven by a motor 11 for pivoting movement of the needle 3, which may for example be a stepper motor or a servomotor.

As a result, a stitch may be formed having a predetermined needle swing pattern.

The needle swing mechanism is provided with an origin sensor 13 for detecting the shielding or cover plate 11a for rotating together with the rotation of the needle swing motor ϊ 1. Thus, the initial position of the needle swing is determined.

FIG. 3 is a block diagram showing a control system of an electronic sewing machine for zigzag stitching where the main motor 1 is driven by the sewing machine speed control circuit 21 and the sewing machine main shaft drive circuit 22 depending on the commands from the pedal 20.

As a result, the main shaft of the sewing machine is driven so that the feeder performs so-called four feed movements.

As a result, the fabric is fed in the amount fed through the scale feed disc 6, and the needle 3 moves vertically so that the stitch is formed.

The synchronizer 23 detects the position of the main shaft, the first stitch and the upper and lower positions, the respective signal forming an input to the sewing machine speed control circuit 21 and the needle swing control motion circuit 24.

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The needle rocker control circuit 24 drives the needle rocker motor 3 via the needle rocker drive circuit 25 and regulates the needle rocker mechanism by receiving a signal from the origin sensor 13,

The backstitch solenoid 27 is actuated during the stitched stitch so as to achieve a feed rate that is adjusted by the feed wheel 7 with the stitch scale for the stitched stitch.

As will be described in more detail below, various data necessary for the control, control and regulation of the sewing machine may be provided via the control panel 10. These data are optionally stored in the memory 26, whereby the rotation of the sewing machine main shaft is controlled on the basis of the data thus set and based on the data set by the scale feed wheel 6 and the scale feed wheel 2, and is further controlled and regulated mechanism for swinging needle movement.

The various switches arranged on the control panel 10 as well as the display unit will now be described in more detail below with reference to the illustration of FIG. 4.

Reference numeral 41 denotes a setting switch (SW) for performing various setting operations, such as switching the set mode and the like.

Reference numeral 42 denotes a condensed stitch start switch to set the "on" or "off" positions to start the condensed stitch.

When the condensed stitch initiation switch 42 is in operation, the condensed stitch initiation display 42a is switched to the "on" or "off" positions.

Reference numeral 43 denotes a condensed stitch end switch to set the "on" or "off" position to terminate the condensed stitch.

When the condensed stitch terminating switch 43 is in operation, the condensed stitch terminating display 43a is switched to the "on" or "off" positions.

Reference numeral 44 denotes a half-stitch (or one-stitch) switch for operating a sewing machine with half-stitch (or one-stitch), and reference numeral 45 denotes a thread-preventing switch to provide instructions for performing a densified stitch by retracting the pedal and not cutting thread,

When the yarn preventing cut-off switch 45 is in operation, the yarn preventing cut-off diode display 45a is turned on, so that it is reported that yarn cut-off prevention is effective.

Reference numeral 46 denotes a switch for increasing or decreasing the value displayed on the display unit 48a to display the second digit on the needle swing display unit 48, which includes sub-display units 48a, 48b and 48c,

When the condensed stitch start switch 42 is operating, so that the letter "A" is displayed on the condensed stitch start diode display 42a, the set condensation stitch count conditions at the start of the condensed stitch may be changed.

In addition, 47 is a switch for increasing or decreasing the value displayed on the display unit 48b to display the first digit on the display unit 48 for pivoting the needle.

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When the condensed stitch end switch 43 is in operation, so that the condensed stitch end diode display 43a shows the letter "B", the set condensation stitch count conditions at the end of the condensed stitch can be changed.

In addition, the first and second digit sub-display units 48a and 48b display the needle swivel width setting or the number of stitches, which can be changed when each switch displaying the letter "C" on the displays 50a to 56a and 60 is in operation.

The display units 48a, 48b and 48c display the baseline position in three digits, which is melted by operating the baseline switch 61 and displaying the letter "D" on the display.

61a LEDs.

Reference numeral 49 denotes a switch for selecting the straight stitch of the swinging needle pattern.

t> When switch 49 is selected, the direct stitch display 49a is on. Thus, it is reported that a straight stitch is selected for the needle swing pattern.

The two-point zigzag stitch switch 50 is used to select the swinging needle pattern for the two-point zigzag stitch.

When the two-point zigzag stitch switch 50 is in operation to select the pivoting needle pattern for the two-point zigzag stitch, the two-point zigzag stitch display 50a is on.

In addition, the three-point zigzag stitch switch 51 is used to select the pivoting pattern of the three-point zigzag needle.

When this three-point zigzag stitch switch 51 is in operation to select the needle swivel movement pattern for the three-point zigzag stitch, the three-point zigzag stitch display 51a is on.

The four-point zigzag stitch switch 52 is used to select the pivoting pattern of the four-point zigzag needle.

When this 4-point zigzag stitch switch 52 is in operation to select the needle swivel movement pattern for the 4-point zigzag stitch, the 4-point zigzag stitch LED display 52a is on.

The left serrated edge switch 53 serves to select the needle swing pattern for the left serrated edge.

When the left serrated edge switch 53 is in operation to select the needle swing pattern, the left serrated edge LED display 53a is on.

The right serrated edge switch r4 is used to select the swivel movement pattern of the right seamed needle stitch.

When this right seam edge stitch is selected for the needle swing pattern, the right serration edge display 54a is on.

The left covered stitch switch 55 is used to select the needle swing pattern of the left covered stitch.

If the left covered stitch is selected for the needle swing pattern, the left covered stitch display 55a is on.

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The right covered stitch switch 56 is used to select the needle swing pattern of the right covered stitch.

If the right covered stitch is selected for the needle swing pattern, the right covered stitch LED display 56a is turned on.

The conventional pattern stitch switch 57 serves to select the stitch movement pattern of the conventional pattern stitch.

When the conventional pattern stitch is selected for the needle swivel pattern, the conventional pattern stitch display 57a is on.

The stop position indicating switch 58 serves to determine the stop position of the needle in the neutral position of the pedal.

In the case of a stop on the left side, the LED display 58a indicating the left stop is on.

In the case of a right-hand stop, the right-hand stop display 58b is on.

In the event of an optional stop, both LEDs 58a and 58b are off.

The detailed adjustment switch 59 is used in combination with the adjusting switch 41, performing the adjusting operation in more detail than the adjusting switch 41.

When the detail setting switch 59 is in operation, the detail setting light display 59a is on.

The stitch number setting switch 60 is used to set the number of seams with serrated edge or covered stitch, while stitch number display 60a is turned on when the stitch number setting is set. The baseline switch 61 is used to change the baseline position while the LED display 61a is turned on when adjusting the baseline position.

Reference 62 denotes a lower thread counter reset switch that is used to reset the lower thread counter (number of stitches) in the sewing machine.

The counter switch "+" and the lower threads are used to set the count value for the counter.

The counter value is displayed on the lower thread counter display unit 64, which includes four sub display units 64a, 64b, 64c and 64d.

In the electronic zigzag sewing machine of the present invention, a straight stitch, two-point zigzag stitch, three-point zigzag stitch, four-point zigzag stitch, serrated edge stitch, concealed stitch, and conventional pattern are used for the needle swivel pattern.

The straight stitch is a pattern for performing a straight stitch at the baseline position without using the needle swing motion, wherein the width (NW) of the needle swing motion is zero, as shown in Figure 5A.

The two-point zigzag stitch represents a stitch in which the location of the needle is at two points, i.e., at the left and right points, with the one-stroke width (NW) of the swinging motion of the needle in accordance with the baseline as shown in FIG. 5D.

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The three-point zigzag stitch represents a stitch having the location of the needle at three points, i.e., the left, middle and right points, with the half-stitch width (NW) of the pivoting movement of the needle in accordance with the baseline as shown in Figure 5E.

The four-point zigzag stitch represents a stitch having the location of the needle at four points, i.e., the left, two middle and right points, with the third stitch width (NW) of the needle pivot movement in accordance with the baseline as shown in Figure 5F.

A wavy or serrated edge stitch is a crescent-shaped stitch for sewing two or twelve or twenty-four-circular stitches as shown in Figure 5B, having three types of needle control, i.e. "standard", crescent-shaped and even needle control.

In addition, there are right and left wavy or serrated edges in the direction of the circular arc.

In the case where the inner side of the sewing machine is defined as the right side and the upper side of the circular arc is located on the inner side, a right wavy or serrated edge is applied.

Otherwise, the left wavy or serrated edge is applied.

The covered stitch means a repetitive operation having a pattern such that the first stitching is first performed, the needle swings with the width (NW) of the needle swings at the second stitch since the last needle control is performed, returning the last stitch back to its original position.

Also in this case there is a right and left covered stitch depending on the direction of swing of the needle.

The right (left) covered stitch has a pattern in which the needle is pivoted from the straight stitch to the right (left).

In addition, a conventional pattern is an original pattern that is selectively created.

Each needle swivel motion pattern includes basic needle swivel motion width (NW), baseline position (NP), baseline reference position (NPs), stitch start position (NS), stitch end position (NE) and number (NC) of stitches.

The width (NW) of the needle swing motion represents the width of the needle swing motion in each needle swing motion pattern.

For example, in the case of the four-point zigzag stitch shown in FIG. 6A, the width (NWs) of one stitch has three divided values of the width (NW) of the swinging movement of the needle.

In other words, it is set

NWs = NW / 3

In the case where the divided value has a remainder, the right and left portions are uniformly based on the center position of the width of the swinging movement of the needle. If the swing width (NW) of the needle is 5.0, then NWs = 1.6 and a residue of 0.2 is reached.

Then, the first stitch is 1.7, the second stitch is 1.6, and the third stitch is 1.7, with 1.7, 1.6 and 1.7 being achieved with a retraction.

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For example, the swiveling width of the wavy or serrated edge is the design width, using data for the swiveling movement of the needle. The data for the swinging movement of the needle are defined with the center distribution.

The pattern has 24 paths or 12 paths, and the calculation for the needle control position is performed according to the relationship

NDp = NP + (NW x NDn / 8.2) and where

NDn - represents needle control data,

NDp - represents the needle control position, and NP - represents the baseline position.

As shown in FIG. 6B, the baseline position (NP) represents the position of the pivoting movable base point at which the center of the sewing-machine needle mechanism of the sewing machine is marked as' 0 ', the inside of the sewing machine is marked as' + '(Right), with the opposite side marked ((left)), and ranging from -5.0 to 0 to +5.0, which does not exceed the maximum needle swing range (WPx).

The baseline reference (NPs) position represents the baseline reference position at which the needle swing can be set to "center reference distribution, right end reference swing and left end reference swing" as shown in Figure 6C.

Initialization is set to the center reference distribution and specifies the pivot reference to the center, right and left relative to the baseline position (NP).

For example, if the position of the baseline

NP - 0,0, needle swing width

NW = 3.0 and baseline reference position

NPs = left, these data being set for a two-point zigzag stitch, then the needle makes a swing between 0.0 and 3.0.

The start position (NS) of the stitch sets the next start position of the stitch after cutting the yarn to 45 "right or left", as shown in Figure 7A, wherein the initialization is set to the start of the left stitch.

The corrugated or serrated stitch and the covered stitch have the right and left sections respectively.

For right corrugated or serrated stitch and right covered stitch, the left stitch origin is set as the initial stitch position.

The number (NC) of stitches represents the number of stitches of corrugated and covered stitch.

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In the case of a corrugated stitch, the "standard" has 24 stitches, the "crescent shape" has 24 stitches, and "uniform has 12 stitches and 24 stitches."

The covered stitch is set to have 3 to 250 stitches.

Initialization is set to have 24 stitches for "standard", "crescent shape" and "uniform" for the wavy stitch, and 4 stitches for the covered stitch.

A densified stitch pattern (also referred to as a densified pattern) to be performed at the beginning or end of a needle swivel pattern is effective for both straight stitch and 2-point zigzag stitch, 3-point zigzag stitch, 4-point zigzag stitch, and plain pattern .

The densification is performed in the sample unit by setting one pattern from the beginning of the stitch backwards.

The number of densities can be set to 19 stitches or less.

In addition, the densified feed amount for the densified stitch is adjusted by means of a densified scale feed wheel 7.

For example, in the case of a four-point zigzag stitch, 6 patterns may be applied as shown in the illustration of Fig. 7B.

Since one pattern has 3 stitches, the number of stitches is 18.

The method of selectively adjusting for a densified stitch comprises a first method of performing a densified stitch with a pattern other than the needle swing pattern, a second method of conventional adjustment for a densified stitch where the needle swing width is reduced within the needle swing width (NW). and the needle swing is performed in the same direction during needle operation within the needle swing width (NW), and a third densified stitch of the conventional pattern (original pattern).

In the method of performing a densified stitch on a densified stitch pattern other than the first needle pivot pattern, the densified stitch pattern (PC), needle pivot width (CW) and densification number (CC) are set for each densified stitch start and densified stitch end. separately from the needle swing pattern.

The baseline position (NP), baseline reference position (NPs), and stitch start position (NS) are identical to the needle swing pattern.

An example will now be described where the initial densified stitch pattern is a four-point zigzag stitch.

The needle swing pattern is a two-point zigzag stitch, and the end thickened stitch pattern is a three-point zigzag stitch as shown in Figure 7C.

Thus, the initial densified stitch pattern is a four-point zigzag stitch, the needle pivot width is CW 1, and the number of densities is three.

The needle swing pattern following the densified stitch is a two-point zigzag stitch.

In the case of a needle swivel pattern after an initial densified stitch, where the initial position is not always determined as a two-point to four-point zigzag stitch, the needle swivel movement is performed at the initial needle swivel point near the end position of the densified stitch.

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If the end position of the start of the densified stitch pattern does not coincide with the beginning of the needle pivot pattern, the speed limit is set for one stitch after the densified stitch is finished.

Furthermore, the end condensed stitch pattern is a three-point zigzag stitch, where the needle swing width is set to CW2 and the number of condensation is four.

For the end densified stitch, one stitch is required to move from the needle pivot pattern to the end densified stitch pattern.

Therefore, the number (densification + one stitch) is set to the number of densified stitches.

In the case of the second conventional densified stitch setting method, a description will be given of a method of reducing the needle swing width within the needle swing width (NW) to adjust the number of stitches and to perform needle swing in the same direction within the needle swing width (NW) during needle control.

In this conventional setting method, the initial spacing width (CPs), the number of stitches of the initial spacing (CNs), the end spacing of the spacing width (CPe), and the number of stitches of the end spacing (CNe) can be set for each initial spacing and each ending. condensation stitch, and cannot be adjusted such that (condensation pitch) x (number of condensation pitch stitches)> (needle swing width).

In the case where the densified stitch pattern is a point-to-point zigzag stitch, the needle swing variation width (NI) of the normal needle swing and the needle swing of the densified pitch is obtained by subtracting the amount of needle swings at the densified pitch from the swing width.

This is achieved by:

(needle swivel transition width (NI)) = (needle swivel width NW) - (densified pitch (CP *)) x (densified pitch (CN *) stitches).

In the case of a three-point zigzag stitch, the transition angle (NTe) of the needle swing is achieved if the value obtained by subtracting the number of needle swing operations at a densified pitch from the needle swing width is less than the needle swing width (NTs).

In the case of a three-point zigzag stitch, if the value obtained by subtracting the plurality of needle pivot operations at densified pitch from the pivot width of the needle is greater than the stitch width (NWs) per stitch, the needle pivot width is obtained by subtracting the stitch width , set as the needle swing variation width (NI).

Consequently, the thickened spacing, the needle transient swivel, and the needle swivel per stitch are gradually controlled.

Also, for a 4-point zigzag stitch, if the residue (NN) obtained by subtracting the spacing width is greater than the Needle Swing Width (NN) for one stitch, the value is divided by the Needle Swing Width per stitch, the rest being set as transition width (NI) ), and the ratio is set as the number (NC n) of the stitches of the one-stroke needle swing.

The number of densified stitches is the residual number of stitches obtained by subtracting the "number of densified spacing, transition stitches, and number of stitch pattern stitches", whereby the needle pivot pattern represents the number of times the stitching can be performed with the number of stitches.

A pattern subjected to a densified pitch is also counted as one pattern.

FIG. 8 shows three patterns of an initial densified stitch.

The method for adjusting the start (end) of the densified stitch pattern will now be described.

- 13 GB 302879 B6

FIG. 9 illustrates the process of setting the origin of the densified stitch pattern.

In step S1, it is decided whether the setting switch (SW) 41 on the control panel 10 and the detail setting switch 59 will be switched on simultaneously.

If they are on at the same time, the detailed setting LED 59a is on at step S2.

Then, in step S3, if the condensed stitch start switch 42 is on, the condensed stitch start diode display 42a is on.

If the condensed stitch pattern number is displayed on the display unit 64d of the display unit 64, the needle swing width is displayed on the display unit 48 if the condensed stitch pattern number is 1 to 3 (step S4).

Referring to FIG. 13, the pattern numbers shown on the display unit 64 and the corresponding densified stitch patterns are shown.

Pattern number '0' represents the same pattern as the needle swing pattern that has the same swing width as the zigzag stitch.

Patterns "1" to "4" represent respective patterns of two-point zigzag stitch, three-point zigzag stitch, four-point zigzag stitch, and straight stitch, with patterns "5" to "9" representing normal patterns (original patterns) as the third condensed stitch.

In this case, the pattern number is displayed on the display unit 64a of the display unit 64, wherein the letter "C" representing the conventional pattern is displayed on the display unit 64b, and the number of steps (corresponding to the number of steps or stitches) is displayed on the display units. units 64c and 64d.

If the setting switch 41 is switched on in step S5 in FIG. 9, the data corresponding to the display is stored in the memory 26 in step S6.

If the pattern or swivel width is to be changed, the pattern is changed by the counter switch 63 + and the lower thread (steps S7 and S8).

If the pattern number is "1" to "3", the swivel width is changed by switches 46 and 47 (steps S9 to S11).

By switching on the setting switch 41, the thus changed pattern and swivel width are stored (steps S5 and S6).

As described above, the pattern of the start of the densified stitch is set.

In the case where the condensed stitch end pattern is to be set, it is necessary to decide whether the condensed stitch end switch 43 is switched on in step S3.

In addition, the light emitting diode display 43a is switched on in step S4 to terminate the condensed stitch.

The other operations are the same as the procedure for setting the condensed stitch origin pattern.

FIG. 10 illustrates a procedure for adjusting the densified stitch by adjusting the number of densified stitch operations (densities).

- 14GB 302879 B6

If the setting switch 41 is turned on (step S21), the needle swing pattern display unit 64 illuminates (step S22).

If the condensed stitch switches 42 and 43 are turned on (step S23), the needle pivot pattern display unit is turned on, the condensed stitch LEDs 42a and 43a light up (step S24).

If the condensed stitch pattern number displayed on the display unit 64 is "0" to "4" in step S25, the number of condensed stitch operations can be set.

The sub-program for setting the condensed stitch parameters is executed.

If the setting switch 44 is switched on in step S27, the displayed data is retained and the lit LEDs 42a and 43a for the densified stitch are terminated in step S28.

Referring to FIG. 11, a procedure for adjusting a third conventional pattern (the original pattern) is shown, wherein the pattern of the densified stitch is the third common pattern.

If the conventional pattern stitch switch 57 and the condensed stitch start switch 42 are operated (step S41), the light-emitting diode display 42a is activated to start the condensed stitch.

If the setting switch 41 is not turned on (step S43), but the lower thread counter switch 63 is turned on (step S44), then the conventional numbers "5" to "9" are displayed on the display unit 64a of the display unit 64, and the letter "C". is shown on sub-display unit 64b (step S42).

The display state is shown in the column of the conventional pattern in Fig. 13.

When the setting switch 41 is turned on (step S43), the number of steps (number of stitches) is displayed on the display units 64c and 64d of the display unit 64 (the note column in Fig. 13), the needle location data being displayed on the display unit 48 ( step S45).

It can be seen which of the control switches in steps S46, S48, S52 and S54 is operating.

The lower thread counter switch 63 is in operation at step S54, wherein the number of steps is changed to increase or decrease.

The number of altered steps is displayed on the display units 64c and 64d of the display unit 64 (step S55).

In addition, the positioning data of the multi-step needle can be adjusted by operating the setting switch 46 in step S52, and the data can be displayed on the display unit 48 (step S55).

As the number of steps increases, the needle location data is adjusted with each number of steps.

If the thread cut prevention switch 45 is on or off, then the letter "E" is displayed on the display unit 48b of the display unit 48 using as the final step of the number of steps that has been set (step S49).

By switching on the setting switch 41, the location of the needle with each number of steps that has been set is stored in the memory 26.

- 15 GB 302879 B6

Thus, the number of steps and needle location data along with the number of steps are set such that the needle location data for each stitch, i.e. the needle pivot pattern, can be generated and stored as a conventional pattern in the memory 26.

In the steps Sole to S75 of Fig. 12, the pattern setting pattern at the end of the densified stitch is shown.

Steps S61 to S75 are substantially the same as Steps S41 to S55 in Fig. 11, except that the condensed stitch terminating switch 43 is operated in Sol step and the condensed stitch end diode display 43a is turned on in step S62, unlike steps S41 and S42 in Figure 11.

The input of the condensed stitch pattern data will be summarized.

If the condensed stitch pattern is "0", the pattern is the same as the needle swing pattern, with the same needle swing width. The number of densified stitches (densified) is set in the course of Figure 10.

If the condensed stitch pattern is "P * to" 3 ", two-point to four-point zigzag stitch patterns are created accordingly.

The initial densified stitch or end densified stitch is set such that the swivel width and the number of densified stitches are adjusted according to the course of Figures 9 and 10.

Furthermore, if the densified stitch pattern is “4”, a straight stitch is created. Therefore, only the number of stitches is set.

Furthermore, if the condensed pattern stitches '5' to '9', the normal pattern is applied.

The position data for all stitches is entered in accordance with the procedure of FIG. 11 and FIG.

12.

An example of a stitch in the case where the densified stitch pattern is the same as the needle swing pattern is shown in Fig. 7B, with a different case being shown in Fig. 7C or Fig. 8.

In accordance with the present invention, the adjustment of the densified stitching is essentially performed by selecting the densified stitch pattern and adjusting the densified stitch parameters (the number of densified stitch operations and the number of densified stitches).

If the parameter is the number of condensed stitch operations, the adjustment is made with reference to Fig. 14.

As shown in FIG. 14, if the adjusting switch 41 and the condensed stitch initiation switch 42 are turned on as described above, then the number of initial condensed stitch operations set is displayed on the needle swivel display sub-unit 48a (step S110).

If the A switch 46 or B "+" switch 47 is operated in step S11, the setting of the number of sewing start or end operations of the condensed stitch is changed to the set value of the switch 46 or 47 (step S12). the number of N stitches with one needle swing width of the needle swing pattern during the compacted stitching, whereupon the number of S stitches during the compacted stitching is calculated (Step S13).

For example, if the needle swing pattern is a four-point zigzag stitch to sew the initial condensed stitch, then the number of stitches is "3" with one needle swing width per pattern.

- 16GB 302879 B6

Therefore, if the number of condensed stitch operations is "3", then the number of condensed stitches is "9".

Similarly, the needle swing pattern can be set to sew the end of the densified stitching.

The number of stitches for densified stitching is determined as the product of the number of stitches for densified stitching and the number of stitches with one needle swing width for the needle swing pattern.

Therefore, the densified stitching is always terminated at the end of the needle swing so that normal stitching is started. As a result, it is possible to prevent sewing displacement that would occur differently from simply adjusting the number of stitches.

When setting the condensed stitch parameter in step S26, the number of condensed stitches is obtained using the number of condensed stitch operations as a parameter, as described above.

In addition, the total number of stitches achieved during the densified stitching can also be set directly as a parameter.

In this case, however, if the number of stitches is not the same as the number of stitches with one needle swing width, that is, it is not an integer or multiple of the number of stitches, the condensed stitch operation ends at the needle swing center. on a common needle swing pattern.

As a result, the sewing quality is adversely affected, which must be corrected.

FIG. 15 shows a secondary program for setting the condensed stitch parameter having as a parameter the total number of stitches achieved during the condensed stitch, and which will be described, with the beginning of the condensed stitch being taken as an example.

An incorrect value indicating the number of initial densified stitches is displayed on the sub-display unit 48a (step 120).

In FIG. 15, the number of stitches for the densified stitching is set.

Therefore, the number Sn of the initial densified stitches is set by A "+" to switch 46 in step S121.

Subsequently, the number of stitches is divided by the number of stitches N of one needle swing pattern to start the densified stitching to obtain a proportion of L and the remainder X in step S122.

If it is determined that the remainder X = 0 in step S123, then the number of Sn stitches reached in step S122 is set to be the number of initial densified stitches (step S124).

If there is a residue X, it is rounded and (L + 1) multiplied by the number of N stitches.

The result so obtained is set as the number of compressed stitches (step S125).

For example, if the initial spike needle stitch pattern is set to a four-point zigzag stitch with the number of stitches set to "8", then 8/3 = 2.6 is rounded up to set the number of condensed stitches to "3" and the number stitches to “9”.

The adjustment is performed in the same manner during the complete stitching.

Thus, the set number of stitches is corrected to be an integer multiple as the number of stitches with one needle swing width corresponding to the needle swing pattern. Therefore, the transition from the center of the densified stitching to the conventional needle pivot pattern is eliminated so that the sewing quality is improved.

- 17GB 302879 B6

In accordance with the present invention, the number of end stitching operations or the number of stitches is not manually adjusted during the densified stitching, but is automatically adjusted along with the densified stitching of the needle pivot pattern.

To this end, the table shown in FIG. 16A was created.

For example, in the case where a conventional two-point zigzag stitch needle pattern is set, a set of densified stitch patterns is set for the needle swing pattern (two-point zigzag stitch, three-point zigzag stitch, four-point zigzag stitch). the stitching operation for each stitch pattern of the stitching needle is stored in the form of a table in the memory 26.

If the needle swivel pattern for the compacted stitch is selected in accordance with Fig. 9 (the start of the compacted stitch or the end of the compacted stitch is selected at the beginning or end because they are identical in the example of FIG. 16) of the final thickened stitch operations are automatically subtracted in accordance with the table in Fig. 16 A.

Figures 16B, 16C, and 16D show the stitching condition, wherein the two-point zigzag stitch, the three-point zigzag stitch, and the four-point zigzag stitch are selected for the densified needle stitch pattern.

FIG. 16B illustrates the case where the needle swivel pattern for the two-point zigzag stitch has been selected for the densified stitching.

The number of each of the compressed stitching start and end operations is four in accordance with the table of FIG. 16A.

Therefore, the two-point zigzag needle stitch pattern is repeated four times during the start and end of the densified stitching.

In addition, FIGS. 16C and 16D show respectively the case where the needle swivel pattern for the three-point zigzag stitch and the four-point zigzag stitch has been selected for the densified stitching.

The number of each of the compressed stitching start and end operations is three in accordance with the table of FIG. 16A.

Therefore, the needle swing patterns for the three-point zigzag stitch and for the four-point zigzag stitch are repeated three times during the beginning and end of the densified stitching.

Since the conventional needle swing pattern has a two-point zigzag stitch in the example of Fig. 16A, such a table may be formed for each other conventional needle swing pattern, and the table shown in Fig. 16A may be formed for each needle swing pattern.

In addition, other parameters, such as the number of thickened stitches, can be stored instead of the number of thickened stitch operations.

Thus, the number of densified stitch operations or the number of densified stitches that are optimal for a given sewing condition can be set for each of the densified stitch patterns.

Therefore, even if the stitch pattern is changed, the optimum stitch parameter can be set automatically so that high quality stitching can be performed.

-18GB 302879 B6

FIG. 17 is a flow chart illustrating the operation of a densified stitching operation.

In step S81, it is decided that the pedal is to be depressed.

If the condensed stitch start switch 42 is turned on (step S82), an initial condensed stitch is created.

Therefore, the condensed stitch origin pattern number is set using switch 63.

In steps S83 and S84, pattern numbers "0" to "9" are distinguished.

The pattern of the initial densified suture is subtracted from the memory 26 depending on each pattern number, the needle 3 moving in a reciprocating direction perpendicular to the fabric feed direction, its movement synchronized with the fabric feed movement of the fabric feeding device in accordance with the subtracted pattern.

As a result, a stitch corresponding to each pattern is produced.

In the case where the condensed stitch pattern is "0", the number of N stitches is the same as the needle swing pattern (step S85).

If the densified stitch pattern is "1" to "4", the number of N stitches is set to be the stitch number of the densified stitch pattern (Step S86).

If the densified stitch pattern is "5" to "9", the number of N stitches is set to be the number of stitches of the conventional pattern (Step S87).

Then, the speed limit is set in the N-th stitch (step S88) and the process proceeds to the needle swing stitch shown in schematic step S10Q.

After the stitch of the needle swing pattern is complete, the pedal is released back (step S91).

If it is found that the condensed stitch end switch 43 is turned on (step S92), the process proceeds to the end condensed stitch pattern as shown in steps S93 to S98.

Similarly, the pattern numbers "0" to "9" are differentiated in steps S93 and S94, wherein the pattern of the end compressed stitch is subtracted from memory 26 depending on each pattern number, and the end compressed stitch is created.

If the condensed stitch pattern is "0", the number of M stitches is the same as the needle swing pattern (step S95).

If the densified stitch pattern is "1" to "4", the number of M stitches is set to be the stitch number of the densified stitch pattern (step S96).

If the densified stitch pattern is "5" to "9", the number of M stitches is set to be the number of stitches of the conventional pattern (Step S97).

The speed limit is then set in the Mth stitch (step S98).

If the yarn cutting operation (step S99) can be performed, the yarn is cut at step S101. This completes the operation.

- 19GB 302879 B6

If the densified stitch pattern is "1" to "4", the number of densified stitch pattern and densified stitches (steps S86 and S96) are set or corrected with reference to Figs. 14 and 15, being automatically set with reference to Figs. Fig. 16.

If the number of stitches is set as the stitched parameter for the start and end of sewing, the number of needle locations can be set.

Industrial applicability

As described above, in accordance with the present invention, the number of needle locations of the needle swing pattern during the densified stitching is set, wherein the number of stitches for the densified stitch is determined as the product of the number of needle swings and the number of stitches .

Therefore, in the case where the number of stitches is simply set, there is a possibility that the densified stitching may be terminated in the center of the swing of the needle, with the starting position of conventional sewing being shifted.

When the number of stitches is calculated in accordance with the present invention, the densified stitching is always terminated at the end of the swing of the needle, so that the normal stitching is started.

As a result, the suture does not shift during the transition from the conventional needle pivot pattern to the thickened stitch needle pattern.

The sewing quality can be significantly improved.

Also in accordance with the present invention, when the number of stitches is set during the stitched stitch, the number of stitches is automatically corrected to reach the end of the stitching of the needle when the stitching of the stitching is terminated at the center of the stitching of the needle.

Therefore, the stitching does not shift during the transition from the conventional needle swing pattern to the thickened needle stitch pattern.

The quality of sewing can thus be significantly improved.

Further, in accordance with the present invention, the number of densified stitch operations or the number of densified stitches that are optimal for a given sewing condition can be set for each of the densified stitch patterns.

Therefore, even when the stitch pattern is changed, the optimum stitch parameter can be set automatically so that high quality stitching can be performed.

Claims (8)

PATENT CLAIMS A method for producing densified stitches at the beginning and end of conventional stitching by an electronic zigzag sewing machine comprising a needle (3) moving vertically and coupled to a main shaft rotatably driven by a main motor (1), a fabric feeding device comprising a fabric feeder for exiting the fabric feed needle plate, and a solenoid for switching the feed amount at the fabric feeding device, and a mechanism for pivoting the needle (3) in a direction transverse to the fabric feeding direction, characterized in that the method comprises the following steps: calculating and obtaining the number (S) of the condensed stitches based on the pre-recorded number (N) of the stitches in a single needle swing (3) for the needle swivel motion pattern (3) for the compacted stitching is specified externally, or the number (Sn) of the condensed stitches externally, and the main motor (1) and the needle pivot mechanism (3) are triggered to produce condensed stitches in accordance with a pre-recorded needle pivot motion pattern (3) at condensing stitching, and lowering the main motor and needle swing mechanism (3) to finally form the condensed stitches and to initiate the conventional stitching when the calculated and obtained number (S) of the condensed stitches is reached. The method of claim 1, further comprising the following steps: correcting the number of condensed stitches as a multiple of the integer number of stitches for a single needle swing (3) for the needle swivel pattern (3) for the condensed stitch if the input number of condensed stitches is not a multiple moving the needle (3) for densified stitching, and lowering the main motor (1) and the mechanism for pivoting the needle (3) to stop forming densified stitches after the number of stitches that has been corrected has been reached. The method of claim 1, further comprising the following steps: selecting the desired needle stitch motion pattern (3) from the needle stitch motion pattern (3) and stitching the main motor (1) and needle stitch motion mechanism (3) based on the stitch parameter corresponding to the selected stitch pattern moving the needle (3) for densified stitching from a plurality of swivel movement patterns of the needle (3) for densified stitching. 4. The method of claim 3, wherein the stitched parameter is the number of stitched operations or the number of stitches. 5. An electronic zigzag sewing machine for producing densified stitches at the beginning and end of a conventional stitching, comprising: a needle (3) for vertical movement coupled to a main shaft rotatably driven by the main motor (1), a fabric feeding device comprising a fabric feeder for projecting on the fabric feed plate, a mechanism for pivoting the needle (3) in a direction transverse to the fabric feed direction and the solenoid to switch the fabric feed rate of the fabric feed device, A memory (26) for storing the needle swivel motion pattern (3) for condensed stitching and the number (N) of stitches with a single needle swivel (3) for the needle swivel motion pattern (3) for condensed stitching, control panel (10) ) for inputting the number (Pn) of repetition of the needle swing (3) for the swivel motion pattern of the needle (3) for densified stitching, or the number (Sn) of the densified stitches, and a control circuit (24) (S) densified stitches based on the recorded number (N) of stitches in a single needle swing (3) for a needle swivel motion pattern (3) for a thickened stitch, and a specified number (Pn) of needle swing repeat (3) or specified number (Sn) condensation stitches, characterized in that the sewing machine main shaft drive circuit (22) and the sewing machine needle moving drive (25) (25) are configured to control the main motor (1) and the needle swinging mechanism y (3) for providing the swinging motion of the needle (3) for producing the densified stitches in accordance with the recorded swinging motion pattern of the needle (3) for the densified stitching, and the main motor and the swinging mechanism of the needle (3) are arranged to provide the swinging motion of the needle (3) for the final formation of densified stitches and for commencing conventional stitching after a specified number of (S) densified stitches have been reached. An electronic zigzag sewing machine according to claim 5, characterized in that the control panel (10) is arranged to enter the number of densified stitches in the swivel movement pattern of the densified stitch needle (3), the swivel control control circuit (24). The needle movement (3) is arranged to correct the number of densified stitches as a multiple of the integer number of stitches with a single needle stroke (3) for the swivel motion pattern of the needle (3) for densified stitching. the needle pivot (3) in the stitch motion pattern (3) for densified stitching, and the sewing machine main shaft drive circuit (22) and the needle pivot drive circuit (25) (3) are arranged to control the main motor (1) and a mechanism for pivoting the needle (3) to provide the pivoting movement of the needle (3) to end the formation of densification CH stitches after the number of stitches that is corrected. An electronic zigzag sewing machine according to claim 5, characterized in that the memory (26) is arranged to store the densified stitch parameters corresponding to the swivel movement patterns of the densified stitch needle (3), the control panel (10) being arranged to selecting the desired stitched needle motion pattern (3) from the stitched needle stroke pattern (3), and the main motor (1) and the needle stroke mechanism (3) are arranged to provide the needle (3) stroke motion in the in accordance with the condensed stitch parameter corresponding to the selected swivel movement pattern of the condensed stitch needle (3). Electronic sewing machine according to claim 7, characterized in that the memory (26) is arranged to store the number of densified stitch operations or the number of densified stitches as parameters of the densified stitch.