JPS63279881A - Pattern match sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) This invention relates to a sewing machine that can sew upper and lower workpiece cloths so that their patterns match.

(Prior art) This type of pattern matching sewing machine detects the edge of the pattern within a predetermined range on the seam formation line while sewing, and determines whether or not there is pattern misalignment at the end of the detection. .

(Problems to be Solved by the Invention) In this case, in conventional sewing machines, the pattern detection range is fixedly determined. Therefore, when the pitch of the patterns on the work cloth is large and the distance between the edges of the patterns is wide, the edges of the patterns cannot be detected, and there is a possibility that it becomes impossible to detect the deviation.

Furthermore, if the pitch of the pattern is extremely narrow compared to the pattern detection range, the pattern deviation correction will not be performed until the fixed pattern detection range ends, resulting in the problem that sewing will be performed with pattern deviation occurring. there were.

The object of the present invention is to provide a pattern matching sewing machine that solves the above-mentioned problems.

Structure of the Invention (Means for Solving the Problems) In order to solve the above problems, in this invention, a length larger than the distance between the edges of adjacent patterns on the seam forming line of the work cloth support surface is used. a setting means for arbitrarily setting the length data; a detecting means for detecting the pattern data of the upper and lower workpiece cloths corresponding to the set length during sewing; A speed changing means is provided for changing the feeding speed of at least one of the upper and lower feeding devices to match the patterns.

(Function) Therefore, in this invention, length data is set to a value slightly larger than the distance between the edges of the handle in accordance with the interval between the handles,
The pattern between the set lengths can be detected. For this reason, the pattern interval becomes larger than the pattern detection range, making pattern detection impossible, or conversely, the pattern interval becomes extremely smaller than the pattern detection range, and sewing is performed with pattern misalignment. This can be prevented, pattern deviation detection can be performed reliably, and pattern deviation correction can always be performed accurately.

(Example) An example embodying the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a sewing machine frame 1 is composed of an arm portion 2 and a bed portion 3. As shown in FIG. 3, a sewing machine main shaft 4 is supported on the arm portion 2, and a
It is rotated by a sewing machine motor 6 shown in the figure via a belt 7 and a driven pulley 5, and as the main shaft 4 of the sewing machine rotates, a copper rod 9 equipped with a needle 8 shown in FIG. 4 is moved up and down. , Bed section 3: In cooperation with the thread ring catcher 11 inside, the upper and lower workpiece cloths 12a, 12b on the workpiece cloth support surface 10 are
Form a seam in between. The side 8, thread loop catcher 11, etc. constitute a seam forming device.

As shown in FIG. 5, a detected part 14 is arranged inside the driven pulley 5, and a detector 27 for detecting the needle top position is mounted on the arm part 2 so as to face the detected part 14. Detector 28 for detecting the lower position and detector 29 for detecting the synchronization signal
are installed on each. When the driven pulley 5 rotates, each of the detectors 27 to 29 optically detects the detected portion, and each of the detectors 27 to 29 receives a needle top position detection signal,
A needle down position detection signal and a synchronization signal (see FIG. 12) are output.

Next, the upper work cloth 12b is engaged with the lower surface of the upper work cloth 12b, and the upper work cloth 1
A lower feed device for applying feed to 2b will be explained. As shown in FIG. 3, a horizontal feed shaft 40 and a vertical feed shaft 41 are supported within the bed portion 3. A lower feed dog 44 is attached to one end of the horizontal feed shaft 40 via a support arm 43 and a feed base 42 . A connecting arm 45 is attached to one end of the vertical feed shaft 41, and its two pronged ends engage with the feed table 42. As the main shaft 4 of the sewing machine rotates, the horizontal feed shaft 40 and the vertical feed shaft 41 are reciprocally rotated, and the lower feed dog 44 is fed four movements to the upper work cloth 12b on the work cloth support surface 10 from below. A fee will be given.

That is, eccentric cams 47 and 48 for horizontal feeding and vertical feeding are attached to the sewing machine main shaft 4, and as the eccentric cam 48 for vertical feeding rotates, the vertical feeding shaft 41 is connected to the sewing machine main shaft 4 via the crank rod 50 and the connecting arm 51. is rotated back and forth within a predetermined range. On the other hand, as shown in FIGS. 3 and 7, a crank rod 49 and a well-known feed switching mechanism 52 are interposed between the horizontal feed eccentric cam 47 and the connecting arm 57 on the horizontal feed shaft 40. There is. As the eccentric cam 47 rotates, the horizontal feed shaft 40 is reciprocated within a predetermined range in accordance with the rotational adjustment of the feed switching device 52.

In addition, each of the eccentric cams 47 and 48, and the crank rod 49
, 50, a horizontal feed shaft 40, a vertical feed shaft 41, a lower feed dog 44, and the like constitute a lower feed device.

Next, a description will be given of a lower feed adjustment device for rotationally adjusting the feed changer 52 to change and set the cloth feed amount for each stitch by the lower feed dog 44, in other words, the feed speed.

Now, as shown in FIG. 7, a feed adjustment member 61 is supported at approximately the center within the arm portion 2, and a feed control cam 63 having a substantially oblique side surface is formed on the front side thereof. The feed adjustment member 61 is urged to rotate clockwise in FIG. 7 by the urging force of a spring 68. Arm part 2
A manual operation member 71 is screwed into the intermediate screw portion 72, and its inner end engages with a feed control cam 63 to regulate the feed adjustment member 61 at a predetermined position against the biasing force of a spring 68. Hold. Then, by rotating the manual operating member 71 and moving the manual operating member 71 in the front and back direction,
The inclination angle of the feed adjustment member 61 is changed via the connecting rod 64, the three-armed connecting lever 66 on the operating shaft 65, and the connecting rod 70, and the feed switching mechanism 52 is accordingly rotated to set the cloth feed amount. Be changed.

A potentiometer 80'h as a feed detector is connected to the link lever 66, and as the link lever 66 rotates, the potentiometer 80 outputs a cloth feed amount detection signal corresponding to the amount of rotation. There is.

Next, the upper work cloth 12a is engaged with the upper surface of the upper work cloth 12a, and the upper work cloth 1
The upper feed device for applying feed to 2a will be explained. As shown in FIG. 4, a presser bar 90 is supported on the arm portion 2 of the sewing machine frame 1, and a top work cloth 1 is attached to the lower end of the presser bar 90.
A presser foot 92 for pressing the work cloth support surface 10 is attached via an upper feed table 91. A substantially L-shaped vertical feed lever 94 is attached to the support shaft 9 on the upper feed table 91.
A movable body 97 is supported on the front guide portion 96 of the movable body 9 so as to be movable back and forth.
An upper feed dog 99 is fixed to the lower surface of 7. and,
Based on the reciprocating swing of the vertical feed lever 94 and the back and forth movement of the movable body 97, the upper feed dog 99 is fed four movements.

Next, the above-mentioned top feed! ! A configuration for imparting four-motion feed to 1199 will be described. As shown in FIG.
3 is supported. The swing arm 1 is attached to the support shaft 103.
08 is fixed, and its lower end is connected to the movable body 97 via a link 109. On the other hand, the sewing machine main shaft 4
An eccentric cam 110 for horizontal upward feeding is attached to the cam 110.

As the eccentric cam 110 rotates, the swing shaft 101 swings back and forth within a predetermined range via the crank rod 111, link 113, and connection arm 112. Accordingly, the movable body 97 is
is moved back and forth.

A two-arm-shaped lever 114 is supported on the support shaft 103 so as to be relatively rotatable, and one end of the lever 114 is connected to the operating shaft 102 via a connecting arm 115 and a connecting lever 116 .

An engaging pin 117 is protruded from the other end of the lever 114, and the upper end of the vertical feed lever 94 is connected to the engaging pin 117.
is engaged from behind.

On the other hand, the sewing machine main shaft 4 has an eccentric cam 118 for vertical upward feeding.
is installed. As the eccentric cam 118 rotates, the operating shaft 102 is reciprocated via the crank rod 119 and the connecting arm 120. As a result, the lever 114 is connected via the connecting arm 115 and the connecting lever 116.
is reciprocally swung, and the reciprocating swiveling motion is transmitted to the vertical feed lever 94 through engagement with the engagement pin 117.

An upper feed device is constituted by the eccentric cams 110 and 118, the crank rods 111 and 119, the swing shaft 101, the operating shaft 102, the vertical feed lever 94, the movable body 97, the upper feed tooth 99, and the like.

Furthermore, the above structure is the same as that of Japanese Patent Application No. 1983-27620 filed by the same applicant as this application.

Next, an explanation will be given of an upper feed adjustment device for changing and setting the cloth feed amount for each stitch by the upper feed dog 99, in other words, the feed speed. As shown in FIG. 3, a rotation shaft 130 is supported on the arm portion 2, and a feed switching device 1 is attached to one end of the rotation shaft 130.
31 is fixed. As shown in FIG. 8, a rectangular bar-shaped movement guide 132 is fixed to the feed switching device 131. A slider 134 is movably supported by the movement guide 132, and the outer end of the link 113 is connected to a support pin 135 protruding from the outer surface of the slider 134.

The feed switching device 131 is always set at a predetermined position as shown in FIG. 8, and when rotated clockwise in FIG.
The larger the angle between the center line of
becomes larger and the feed speed becomes faster.

As shown in FIG. 6, the arm portion 2 is provided with an upper feed adjustment pulse motor 137 having an output shaft 136 and serving as speed changing means. A lever 138 is fixed to this output shaft 136.

An actuating shaft 139 is supported within the arm portion 2, a linking protrusion 140 is attached to the front portion thereof, and a lever 141 connected to the lever 138 via a link 142 is fixed to the rear portion thereof. . A two-armed rotating lever 143 is fixed to the rotating shaft 130, and one end thereof has an engaging portion 144.
is engaged with the linking protrusion 140 from above. On the other hand, a connecting arm 145 is rotatably supported on the operating shaft 65, and its tip is connected to the other end of the rotating lever 143 by a connecting link 146. This connecting arm 145 is biased to rotate counterclockwise in the M7 diagram by a spring (not shown), and due to the action of the spring, the rotating lever 143 is rotated in the direction in which it engages with the connecting protrusion 140 via the connecting link 146. It is dynamically energized.

6 shows a pulse motor 137 for adjusting the covering soil feed.
When the operating shaft 139 is rotated counterclockwise in the figure, the rotating lever 143 and the rotating shaft 13 are rotated by the biasing force of a spring (not shown) that biases the connecting arm 145 to rotate.
0 is rotated clockwise in FIG. 6, thereby reducing the amount of cloth feed per stitch and bringing the feed speed closer. In addition, the operating shaft 139 is controlled by the pulse motor 137 for adjusting the upper feed.
When is rotated clockwise in the figure, the rotation lever 143 and the rotation shaft 130 are rotated in the opposite direction to the above, the amount of cloth fed per stitch is increased, and the feed speed is increased.

Note that the pulse motor 137, the operating shaft 139, the rotation shaft 130, the feed switching device 131, etc. constitute an upper feed adjustment device.

As shown in FIGS. 1 and 2, a cloth guide device 151 is disposed on the bed portion 3 on the cloth feeding side from the needle drop point. This cloth guide device 151 includes a cloth edge guide 152 and separation plates 153 to 155 made of three metal plates.
It is protruded from the left side of 52. Projections 156 and 157 are provided on the lower surfaces of the tips of the upper and middle separating plates 153 and 154, respectively. And each separation plate 153゜1
54. The work cloth 12a with the edge parts of the upper and lower two work cloths 12a and 12b inserted between 54.155.

12b, said protrusion 156.1
By applying resistance to each work cloth 12a, 12b by the action of 57, the cloth edge guide 1 is applied to each work cloth 12a, 12b.
52 side is generated, and the edge portions of each workpiece cloth 12a, 12b are transported along the cloth edge guide 152 to the needle drop point.

Further, reflective sensors 158 and 159 as pattern data detection means for optically detecting the pattern of the upper and lower work cloths 12a and 12b by irradiating the detection light onto the upper and lower work cloths 12a and 12b are as shown in FIG. It is supported through the upper and lower separation plates 153 and 155 so as to be located on the seam forming line N passing through the needle drop point, and is opposed to the upper surface of the upper work cloth 12a and the lower surface of the lower work cloth 12b, respectively. Placed.

As shown in Fig. 1, on the front side of the arm section 2 there is a pattern matching key 175 for selecting and setting a pattern matching mode, and a dimension slightly larger than the maximum pattern spacing is input as a specified length for detecting pattern misalignment. A pattern spacing key 176 is arranged for
The specified length input using the pattern spacing key 176 is displayed on the display section 1.
This can be confirmed by 77. This input dimension is RAM1 which will be explained later.
68. This pattern interval key 176 and RAM 16
8 constitutes a setting means for setting an arbitrary prescribed length. Further, an encoder 149 for detecting the speed of the top work cloth as a speed detection means is mounted on the cloth guide device 151, and includes a rotary plate 148 that is rotated in contact with the work cloth 12a. ), the rotary plate 148 is rotated in accordance with the transfer of the top work cloth 12a, and the encoder 149 outputs a cloth feed amount detection signal for each stitch, that is, a feed speed detection signal, according to the amount of rotation.

Next, the control circuit of the sewing machine in this embodiment will be explained with reference to FIG. Now, the central processing unit (CPU) 16
0 constitutes a correction means and a calculation means, and its CPU 160
A start/stop signal output from the start/stop signal generation circuit 162 based on the depression of the foot pedal 161 is input to the step.

Based on the start/stop signal, CPU 160 controls driving of sewing machine motor 6 via sewing machine motor drive circuit 163. Further, the CPU 160 receives input from each of the detectors 27 to 29, such as a count position detection signal, a needle down position detection signal, and a synchronization signal shown in FIG. 12, and also receives cloth feed amount data from the potentiometer 80.

The signals output from the sensors 158 and 159 are A/D converted by the A/D converter 165 every time the synchronization signal is generated. After smoothing the A/D converted data group, the CPU 160 performs differential processing, matches the differential signals, and determines the amount and direction of deviation of the patterns of the upper and lower work cloths 12a and 12b.

The ROM 167 stores various programs for controlling the overall operation of the sewing machine in addition to the programs shown in the flowcharts described below.As shown in FIG.
Feed amount data corresponding to the synchronization signal is stored. In this embodiment, the feed operation period corresponds to the period during which ten synchronization signals are output from the output of the needle down signal.

Based on the deviation direction data and the deviation amount data, the CPU 160 rotates the top feed adjustment pulse motor 137 via the pulse motor drive circuit 169, operates the top feed switching device, and changes the cloth feeding speed by the top feed device. Change settings.

Next, the operation of the sewing machine configured as described above will be explained based on the flowcharts shown in FIGS. 13 to 15.

These flowcharts proceed under the control of the CPU 160. Now, as shown in FIGS. 9 and 10, the operator first sets the work cloths 12a and 12b of the same pattern on the work cloth support surface 10 through the cloth guide device 151, and lowers the presser foot 92. Then both work cloths 12a and 12b are pressed onto the work cloth support surface 10. On the other hand, use the pattern matching key 175 to set the pattern matching mode, and use the pattern spacing key 176 to set a value slightly larger than the maximum of the edge spacing between adjacent arrogant patterns, as shown in FIGS. 17(a) and 17(b). Enter the specified length as L.

By operating the foot pedal 161 in this manner, the upper and lower workpiece cloths 128 are
．． If a shift occurs in the handle between the handles 12b, the shift is detected, and the upper feed adjustment pulse motor 137 is controlled to rotate by a predetermined amount, and the upper feed speed is changed to eliminate the shift. Ru. The above steps are repeated every time the sewing of the specified length L is completed.

Now, when the pattern matching mode is set by operating the pattern matching key 175 in steps 81 and 82 of FIG. is stored in the RAM 168. In step S4, a computation is performed to calculate a prescribed number of data according to the prescribed length L. This calculation is performed by dividing the specified length by the length of the upper cloth feed pitch, and inputting this value per stitch to the number of synchronization signals during filter cloth feed operation (in this example, as described above, 1
An operation of multiplying by 0) is performed.

For example, the specified length is 3Qmm and the feed bit is 3IIll.
In this case, 30/3X10=100, and that 100
This value is stored in the RAM 168 as the specified number.

The value of the number of times the upper feed adjustment pulse motor 137 was controlled to eliminate deviation in step S5 is R as rOJ.
It is stored in AM168.

Roughly speaking, in step S6, the value of the number of luminance data and the value of the number of stitches, which will be described later, are each set to "0" and stored in the RAM 168.
is memorized.

In step S7, it is determined whether or not the foot pedal 161 has been depressed forward, and if NO, the process returns to step S1. Note that the processing in steps S3 and S4 is performed using the pattern matching key 175 and the pattern spacing key 176.
The process is performed only when the key is operated, and the processed data is retained until the key is operated again or the power is turned off.

When the foot pedal 161 is depressed forward, the sensor 15
8. The upper and lower workpiece cloths 12 are attached to the cloth guide device 151 by 159.
It is determined whether or not the work cloths 12a and 12b are set, and if the work cloths 12a and 12b are set, sewing is performed by rotating the sewing machine motor 6 in step S9. At this time, as the work cloths 12a and 12b are transferred, the encoder 149 is rotated by engagement with the upper work cloth 12a and a pulse signal is output, and the count data is R.
It is stored in AM168. At step 810, it is determined whether one synchronizing signal has been input from the synchronizing signal detector 29, and if YES, the process proceeds to the subroutine of step 811 shown in FIG. In this subroutine, it is determined in step 812 whether the synchronization signal is within the feed operation range shown in FIG. , 12b is being sent. If NO, the process returns to the main routine via step 814; if YES, the process returns to step 81.
3, the amounts of reflected light from the upper and lower workpiece cloths 12a and 12b detected by both the sensors 158 and 159 are A/D converted by the A/D converter 165 as one luminance data Da shown in FIG. The data is stored in the RAM and the number of data is increased by +1.

In step 814, it is determined whether or not a needle down signal is output.
If the play is No, return to the main routine.

In this way, each time the synchronization signal corresponding to the feed is output, the luminance data [)a shown in FIG. 16 is stored in the RAM one by one.
168, and are continuously accumulated as a detection data group as shown in FIGS. 17(a) and 17(b). In step S15 of the main routine, the luminance data Da is set to a specified number of 1.
It is determined whether the number has reached 00 or not, and in the case of No, the process returns to step S7.

Further, when the output of the needle down signal is confirmed in step 814, the number of stitches data is incremented by +1 and stored in the RAM 168 in step 816.

In step 817, it is determined whether the stitch count data stored in the RAM 168 is a multiple of 5, and if NO, the process returns to the main routine. Therefore, scanning is executed through steps 87 to 817 until the stitch count data reaches a multiple of five. When the count data becomes a multiple of 5, step 8
In step S18, the number of upper cloth encoder pulses detected by the encoder 149 during the previous five stitches of sewing is read out from the RAM 168, and in step S19 it is determined whether the control number is rOJ, and if YES Return to the main routine. If the answer is NO, the process proceeds to step 836, which will be described later.

When it is confirmed in step 815 that the number of brightness data Da has reached the specified number 100, that is, when the sewing of the specified length L is completed, in step S20, the pattern detection data group of the upper and lower workpiece cloths 12a, 12b is Riga 18th
Smoothed as shown in the figure. In step 821, the rate of change of the light intensity change curve represented by the detection data group is differentiated and expressed as the magnitude of the rate of change as shown in FIG. Data corresponding to vertical patterns that pass slowly and show only a gradual rate of change are cut and invalidated. Therefore, peaks appear only in the portions corresponding to the lateral edges.

In step 822, the upper and lower workpiece cloths 12a are processed.

The curve of the rate of change corresponding to the arrogance of 12b is matched to find the difference between both data, and both processed cloths 12a and 12b are
The amount and direction of deviation between the patterns are calculated. In other words, as shown in Fig. 20, one of the differentiated rate-of-change curves is moved in the direction of the arrow or in the direction opposite to the arrow by one piece of luminance data to find the position where the difference between the two convex lines is minimum. wanted,
In the same way, the other rate of change curve is moved to find the position where the difference is minimum, and thereby the upper and lower workpiece cloths 12a,
12b's arrogant shift gate and the direction of shift in the sewing direction are determined.

Next, the process proceeds to the subroutine of step S23, and as shown in FIG. 15 and FIG. The amount of advance of the cloth 12a is calculated. Next, in step S25, the deviation IM
It is determined whether or not the amount of deviation is smaller than the specified amount of deviation. If the amount of deviation is small and correction of the deviation is not necessary, the process proceeds to step 835, where the rotational position of the upper feed pulse motor 137 is set to the initial position, and step 832 Then the pulse motor 13
7 is rotated to take the initial position, and the feed speed of the upper feed dog 99 becomes the initial speed. If the deviation is larger than the specified amount, it is determined in step 826 whether the number of times the upper feed adjustment pulse motor 137 is controlled is "0", and NO is selected.
In the case of YES, the process advances to step S27, and in the case of YES, the process advances to step S828. In step 827, it is determined whether or not the sign of the deviation amount in the previous control and the deviation amount applied to the current control has changed in sewing to be described later after the end of '$iS. , it is determined whether or not the minus sign has been reversed. If the deviation has been corrected and the sign has changed, the process proceeds to step S32 via step 835'. If the sign has not changed, the process advances to step S28.

In step 828, the number of upper cloth encoder pulses for 5 stitches before the end of the specified count, the deviation amount M, and the deviation fi
The number of cloth reference encoder pulses for each number of stitches for five stitches is calculated from the plus and minus values representing the direction of M and is stored in the RAM 168. That is, the upper feed pitch for each stitch, that is, the upper feed speed is set as the reference encoder pulse number of the encoder 149 so that the pattern deviation is eliminated when the sewing of five stitches is completed from the end of the calculation. In step 829, based on the calculation result in step 828, the amount of rotation of the upper feed adjustment pulse motor 137 is calculated so that the upper feed amount provides the above-mentioned upper feed pitch (top feed speed). and,
In steps S30 and 831, it is determined whether the calculated value is larger than a predetermined range or smaller than a predetermined range, respectively;
That is, if the calculated value of the rotation amount of the pulse motor 137 is within a predetermined range, the pulse motor 137 is rotated in accordance with the calculated value in step S32. Further, if it is determined that the value of the rotation amount calculated in steps 830 and 831 is outside the predetermined range, the value of the rotation amount is determined to be within the upper or lower limit of the predetermined range in step S33 or step 834. Each is set. Therefore, it is possible to prevent the top fabric from being fed too fast or too slow, causing puckering or excessive stretching.

Thereafter, in step 837, the value of the number of times of control is incremented by +1, and the process returns to step S6.

Then, in step S6, the brightness data and the stitch count data are cleared to prepare for detecting pattern deviation at the time when the specified length has been sewn from the calculation end point.

Also, counting of the number of stitches starts from the calculation end point, and the number of stitches becomes a multiple of 5, and the determination result in step S17 is Y.
When ES is reached, the number of pulses of the encoder 149 for the last five stitches is read out from the RAM 168 in step 818. That is, in step 818, the actual feed amount of the finished cloth 12a for the last five stitches is detected. Then, in step 819, it is determined whether the number of times the upper feed adjustment pulse motor 137 is controlled is "0", but in this case, the number of times of control has already been increased by one in step 837, so becomes No, and the process proceeds to step S36. In step S36, the reference encoder pulse number representing the corrected feed rate set in step 828 and the actual encoder pulse number detected in step 818 are compared to see if they match, and the detected encoder pulse number is is different from the reference encoder pulse number, the amount of difference is 5
Correction is applied to the reference encoder pulse number for the next five stitches divided into equal parts. For example, when the difference amount is 5 pulses more,
A correction is made in which the set number of reference encoder pulses corresponding to each needle is reduced by 1 pulse for 5 stitches, and the upper work cloth 12a is moved at the feed amount corresponding to the number of pulses, that is, the feed speed.
The operation of the upper feed adjustment pulse motor 137 is controlled so that the upper feed adjustment pulse motor 137 is transferred. In this way, the presence or absence of pattern deviation is detected every time five stitches of sewing are completed, and if pattern deviation occurs, the above-mentioned correction is applied.

After that, when the specified length has been sewn, the upper and lower workpiece fabrics 1
The presence or absence of a deviation in the pattern between 2a and 12b is detected, and if the deviation in the pattern is greater than the prescribed amount in step 825, the above-mentioned correction operation is performed.

As described above, in this sewing machine, the workpiece cloths 12a, 1
The length data can be set using the pattern spacing key 176 to match the maximum edge spacing between adjacent patterns 2b and to a value larger than the edge spacing. In this way, the number of input pieces of pattern detection data is defined according to the length. Then, when a specified number of pattern detection data are input, a pattern shift between the upper and lower work cloths 12a, 12b is detected, and the upper feed device is operated accordingly to eliminate the pattern shift.

In other words, in this sewing machine, the range from which pattern data is collected can be freely set according to the pattern spacing. Therefore, the handle detection range becomes narrower than the distance between the edges of the handle, making it impossible to detect the edges of the handle, or the handle detection range becomes extremely larger than the distance between the edges of the handle, making it difficult to detect handle misalignment. This can be reliably prevented.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but may be configured such that the feed speed by the lower feed device is changed (1) in order to eliminate handle misalignment, or the feed speed by both the upper and lower feed devices may be changed. It may be configured as follows.

Effects of the Invention As exemplified in the embodiments above, the present invention exhibits excellent effects in that the pattern of the work cloth can be detected reliably and pattern misalignment can be corrected accurately.

[Brief explanation of the drawing]

The drawings show an embodiment embodying the present invention, in which Fig. 1 is a perspective view showing the entire sewing machine frame, Fig. 2 is a plan view showing the cloth guide device, and Fig. 3 is the inside of the sewing machine frame. FIG. 4 is a partially cutaway side view showing the upper and lower feed devices; FIG. 5 is a cross-sectional view showing a signal detection section related to the main shaft of the sewing machine; FIG. 6 is a perspective view showing the feed adjustment mechanism. ,
FIG. 7 is a partially cutaway side view, and FIG. 8 is a sectional view showing an adjustment mechanism operated by a pulse motor for adjusting upper feed.
FIG. 9 is a partially cutaway front view showing the cloth guiding device in the cloth guiding state, FIG. 10 is a plan view also showing a portion of the cloth guiding device, FIG. 11 is a block diagram showing the electrical configuration, and FIG. 12 is a A diagram showing the needle position, feed interval, generation of synchronization signal, etc. in relation to the rotational position of the main shaft of the sewing machine, FIG. 13 is a flowchart showing the main routine of the program of this sewing machine, and FIG. Flowchart showing the subroutine, FIG. 15 is a flowchart showing the subroutine of step 823 in FIG.
The figure is an enlarged view showing luminance data, FIG.
) is an explanatory diagram showing the pattern of the finished cloth and the detected data group, No. 18
Figure 41 shows the brightness signal after smoothing, Figure 19 is a diagram showing the pattern data after differentiation, Figure 20 is an explanatory diagram showing the matching state, and Figure 21 shows the process of correcting pattern deviation. It is an explanatory diagram. 8... Needle, 10... Work cloth support surface, 11... Thread ring catcher (a stitch forming device is constituted by the needle and thread ring catcher), 12a... Top processing Cloth, 1211...
・Top work cloth, 44...Lower feed tooth constituting the lower feed device, 99...Upper feed tooth constituting the upper feed device, 137.
...=30- Pulse motor for upper feed adjustment constituting the speed changing means, 1
58.159...Sensor constituting the detection means. Patent applicant Agent: Brother Industries, Ltd.
Patent Attorney On 1) Hironobu Figure 17 (b) Voluntary procedure amendment August 31, 1986 2. Title of invention pattern matching sewing machine 3. Relationship with the case of the person making the amendment: Patent issue address Mizuho, Nagoya City 9-35 Hotta-dori, Ward Name 526 Brother Industries, Ltd. (Name)
Representative Katsuji Kawashima 4, agent address 0582 No. 2 Hatazume-cho, Gifu City, 500 Japan
(65) -1810 (inclined) Fax only 0582
(66)-13395, Detailed description of the invention column of the specification subject to amendment, Drawing 6, Contents of amendment (1) Mei IBI, page 24, line 15 to page 25, line 4, “In step 828 is set.'' should be amended as follows. [In step 828, the calculation of the amount of deviation is completed based on the number of upper cloth encoder pulses of the stitch number valve sewn under the control of the current control number, the amount of deviation M, and the positive and negative values representing the direction of the amount of deviation M. The reference encoder pulse number corresponding to five stitches from the hour is calculated and stored in the RAM 168. In other words, the feed amount of the top cloth every five stitches is set as the reference encoder pulse number of the encoder 149 so that the pattern deviation is eliminated when the next controlled number of sewing is completed. (2) The statement "Different from encoder pulse number...correction will be added" on page 27, lines 6 to 16 will be corrected as follows. [If it is different from the encoder pulse, the operation of the upper feed adjustment pulse motor 137 is controlled according to the phase -2=appropriate amount and the plus or minus sign. For example, if the number of detected encoder pulses is greater than the reference encoder pulse number, the magnitude of the difference is multiplied by a correction coefficient, and the value divided into five equal parts is calculated as the upper feed speed of the upper feed adjustment pulse motor 137 ( Control is performed to reduce the pitch from the upper feed pitch). In this way, every time five stitches of sewing are completed, the actual feed speed of the upper work cloth 12a is corrected to match the corrected feed speed. (3) Drawing Middle East Figure 17 (a), Figure 17 (b), Figure 18
Figures 19, 20, and 21 have been corrected as shown in the attached sheet. Ward Ward ■ ■ Division Thigh Ward O ~ Limited

Claims (1)

[Claims] 1. A needle (
8) and two upper and lower work cloths (12a) (1) having patterns corresponding to each other on the work cloth support surface (10).
2b) to sew both processed fabrics (12a) and (12b) together.
) is operated in synchronization with the operation of the stitch forming device (8, 11), and along with the operation, the upper and lower workpiece fabrics (12) are
a) A value larger than the distance between the edges of adjacent patterns on the seam forming line of the upper feeding device (99) and lower feeding device (44) that apply feeding to (12b) and the work cloth support surface (10). Setting means for arbitrarily setting the length data of (
168, 176), and the upper and lower work cloths (12
a) Detection means (158) for detecting the pattern data of (12b)
, 159), and a speed changing means (137) that changes the feed speed of at least one of the upper and lower feed devices (99) and (44) to match the handles if the upper and lower handles are misaligned as a result of the detection. A pattern matching sewing machine.