JPH0121994B2 - - Google Patents

Description

[Detailed description of the invention]

Technical Field The present invention relates to a sewing machine capable of darning, and in particular, the spacing between rows of stitches in vertical stitching, which basically constitutes darning, can be changed according to the thickness of the thread, thereby preventing thread jams. This invention relates to a sewing machine that can perform darning. BACKGROUND OF THE INVENTION A sewing machine is known that is equipped with a sewing needle capable of vertical reciprocating motion and horizontal swinging motion, and a feed dog capable of forward and backward feeding motion, and capable of performing darning. Darning on such a sewing machine is generally performed in such a way that forward feed stitch rows and backward feed stitch rows (vertical stitches) extending in both the front and rear feed directions of the feed dog are alternately spaced apart in the direction of swing of the sewing needle. It is basically constructed by forming a predetermined number of rows and a predetermined length.
However, in the case of darning in a conventional sewing machine capable of darning, the distance between the forward feed stitch row and the backward feed stitch row that constitute the darning stitch row in the direction of swing of the sewing needle can be set to a predetermined constant value. However, when the thickness of the thread used for darning becomes large, there is a problem in that the thread gets jammed on the fabric to be processed. Purpose of the Invention The present invention has been made against the background of the above circumstances, and its purpose is to adjust the forward feed stitch row and backward feed stitch row according to the thickness of the thread used for darning. To provide a sewing machine capable of darning, in which the spacing in the sewing needle swing direction can be changed and thread clogging can be prevented even when relatively thick thread is used. Structure of the Invention In order to achieve the above object, the gist of the present invention is to provide forward feeding stitch information and backward feeding stitch information for forming the forward feeding stitch row and the backward feeding stitch row, respectively. a storage device for storing data; and a darning length for generating a front end position signal and a trailing end position signal respectively corresponding to the front and rear end positions of the darning in order to determine the length of the darning in the feeding direction of the feed dog. a setting means; an operation section operable for setting and changing the spacing between the two stitch rows, and a spacing setting responsive to each of the two position signals to generate spacing information regarding the set spacing; means for specifying the forward feed stitch information in connection with generation of spacing information from the spacing setting means responsive to the trailing edge position signal, and generating spacing information from the spacing setting means responsive to the leading edge position signal; specifying means for specifying the backward feed stitch information in relation to the sewing needle, and a number of rows of the double stitches determined based on a predetermined width of the darning stitch in the swinging direction of the sewing needle and the set interval. The apparatus further includes a control means for operating the interval setting means and the specifying means while a row of stitches is being formed. Effects of the Invention According to this method, when the interval between each stitch row for forward feeding and backward feeding is set according to the thickness of the thread by operating the operation part of the interval setting means,
Spacing information regarding the spacing is generated, while forward and backward feed stitch information is specified in the designation means in connection with the generation of the spacing information.
Since each stitch row is formed according to the specified stitch information, the interval between the stitch rows can be set to suit the thickness of the thread used for darning, thereby preventing thread jams during darning. This can be suitably prevented. Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on the drawings. In FIG. 1, the sewing machine includes a base portion 10, a pedestal portion 12 that stands upright at one end of the base portion, an arm portion 14 whose one end is supported horizontally by the pedestal portion 12, and the arm portion 14. A head 16 formed at the other end. The head 16 is provided with a needle bar 18 that is reciprocated in the vertical direction as the main shaft (not shown) rotates and is also swung laterally by a known needle bar swing drive mechanism (not shown). A sewing needle 20 is attached to the rod 18. In the vicinity of the needle drop point of the sewing needle 20 of the base portion 10, there is a known feed adjustment device (not shown) that is driven in synchronization with the rotation of a main shaft (not shown) to feed the work cloth in the front-back direction, and whose cloth feed direction and feed amount are adjusted. A feed dog 21 is provided which is adjusted by a device drive mechanism. Further, a pattern display device 26 is attached to the front surface of the arm portion 14, and includes various shapes 22 representing patterns that can be sewn and a plurality of light emitting diodes 24 corresponding to the shapes 22. A pattern selection push button 28 is provided on the right side of the container 26. A start/stop push button 30 for starting or stopping the sewing machine each time it is pressed is provided on the front surface of the head 16, and a speed setting button 30 for setting the rotational speed of the sewing machine motor 32 is provided on the pedestal section 12. A container 34 is provided. Further, above the speed setting device 34, a needle swing setting device 27 and a feed setting device 29 are provided, and near these, switching push buttons 31, 33 for switching from automatic to manual setting, and a button for switching to manual setting are provided. LEDs 35 and 37 are respectively provided to indicate the switching by lighting. As shown in FIG. 2, a presser foot 36 is disposed near the needle bar 18 of the head 16 and is moved up and down manually by an operator, and a known buttonhole presser is attached to the lower end of the presser foot 36. A device 38 is attached. The cloth presser device 38 includes a presser frame body 40, a presser body 42 which is slidably engaged with the presser frame body 40 in its longitudinal direction inside the presser frame body 40 and is attached to the presser bar 36, and a presser frame body 40. Adjustment plate 44 fitted at the rear end so as to be expandable and contractible in the longitudinal direction
It is equipped with Further, in the head 16, a switch device is provided with an arm 50 that selectively engages a fixed piece 46 fixed to the presser frame 40 and a movable piece 48 fixed to the adjustment plate 44. 52
is provided, and the fixed piece 46 can be adjusted by expanding and contracting the adjusting plate 44, which is also an operating body for setting the darning length.
When the distance between the fixed piece 46 and the movable piece 48 is set to a desired distance corresponding to the entire length of the darning, the fixed piece 46 and the arm 50 are connected to each other at the front end of the darning, and the movable piece 48 is connected to the arm 50 at the rear end of the darning. 48 and the arm 50, the switch device 52 generates a front end position signal and a rear end position signal, respectively. Therefore, the presser foot device 38 and the switch device 52 form a darning length setting device that sets the length of the darning.
The switch device 52 and the presser foot device 38 are described in an earlier application filed by the present applicant (Japanese Patent Application Laid-Open No.
166888), detailed explanation will be omitted. The sewing machine configured as described above is equipped with a circuit shown in FIG. 3. In the figure, a pattern signal SM, which is the counted contents, is supplied from a counter 54 which advances each time the pattern selection push button 28 is pressed to a display driver 56, a leading address memory 58, a discriminator 60, and a buttonhole controller 66. A display current is supplied from the display driver 56 only to the light emitting diode 24 corresponding to the pattern signal SM, causing it to emit light.
That is, the operator can sequentially move the light-emitting position of the light-emitting diode 24 each time the pattern selection button 28 is pressed, and by lighting the light-emitting diode 24 corresponding to the shape representing the desired stitch, the desired pattern can be selected. You can choose the pattern. The start address memory 58 stores the start addresses corresponding to each pattern that can be sewn (excluding darning and buttonhole stitching), and generates a series of stitch data for sewing a desired pattern. Pattern signal to be extracted from device 62
The first address corresponding to SM is transferred from the first address memory 58 to the first port P1 of the multiplexer 64.
supplied to In the discriminator 60, it is determined whether the pattern signal SM is a buttonhole stitch or a darning stitch.
If it is buttonhole sewing, the first discrimination signal
If PS1 is darning, the second discrimination signal PS
2 is generated. The first discrimination signal PS1 is supplied to the buttonhole controller 66, and is also supplied to the multiplexer 64, causing the multiplexer 64 to select the second port P2.
Further, the second discrimination signal PS2 is transmitted to the darning controller 6 as a control means for controlling the formation of darning.
8, while also being supplied to multiplexer 70, which has its input port
Let them choose PB. The stitch data generator 62 is supplied with timing signals TPF and TPB from a timing signal generator 72 according to the timing shown in FIG.
In the stitch data generating device 62, a series of stitch data stored in addresses below the first address supplied via the multiplexer 64 is generated in synchronization with the timing signals TPF and TPB.
These are the multiplexer 70 and the D/A converter 6.
9, voltage divider 71, 73, analog switch 75,
77 to the actuator driver 74. Those analog switches 75 and 77 are
Voltage dividers 71 and 73 connected to the D/A converter 69
output signal, needle swing setting device 27, and feed setting device 29
The output signal is selectively selected and output to the actuator driver 74. One stitch data is needle position data representing the swing position of the sewing needle 20.
It is composed of SN and feed data SF representing the feed amount and feed direction of the work cloth, and in response to the timing signal TPF, the feed data SF is
Handle position data SN in response to timing signal TPB
is supplied to input port PA of multiplexer 70. In the actuator driver 74, driving power is supplied to the needle swing actuator 76 and the feed actuator 78 based on the needle position data SN and the feed data SF. The needle swing actuator 76 drives the needle swing mechanism, and positions the sewing needle 20 at the position represented by the needle position data SN. In addition, the feed actuator 7
Reference numeral 8 drives the feed adjuster, and determines the rotational position of the feed adjuster so that the feed amount and feed direction of the work cloth represented by the feed data SF are obtained. The operations of the needle swing setting device 27 and the feed setting device 29 are enabled by a manual adjustment setting device 79 which is operated in response to the operation of the switching push buttons 31 and 33. The manual adjustment setting device 79 includes a pair of T-type flip-flops (not shown) that are set or reset each time the switching pushbuttons 31 and 33 are pressed, and analog switches 75 and 77 are set depending on the set state of the T-type flip-flops.
are made to selectively select the outputs of the voltage dividers 71 and 73, or the outputs of the needle swing setting device 27 and the feed setting device 29, respectively, and the LEDs 35 and 37 indicating that the manual side has been selected are lit. It is. Further, the manual adjustment setting device 79 switches the analog switch 75 when the first discrimination signal PS1 indicating that buttonhole stitching has been selected and the second discrimination signal PA2 indicating that darning has been selected are supplied. Each output for switching to the manual side is prohibited. Furthermore, in the manual adjustment setting device 79, the switching push button 3
When the T-type flip-flop is switched to a set state representing a manual state by the pressing operation in step 1, an actuation control signal ACM is generated, and the actuation control signal ACM is supplied to a darning controller 68. There is. The needle swing setting device 27 is used as an operating body for selecting the number (interval) of vertical stitch rows when darning is selected. Also, a potentiometer 81 operatively connected to the needle swing setting device 27
and an A/D converter 83 that converts the output signal of the potentiometer 81 into a digital quantity, and when the needle swing setting device 27 is used as the operating body, it represents the manipulated quantity. Operation signal MPD
is supplied to the darning controller 68. On the other hand, each time the start/stop push button 30 is pressed, the T-type flip-flop 80, which is set or reset, outputs a start signal corresponding to the set state.
ST is supplied to the motor drive control circuit 82 and also to the buttonhole controller 66 and darning controller 68. In the motor drive control circuit 82, while the drive signal ST is being supplied, the difference between the rotation speed set by the speed setter 34 and the actual rotation speed of the sewing machine motor 32 detected by the speed detector 84 is zero. The power supplied to the sewing machine motor 32 is controlled so that the sewing machine motor 32
is rotated at a constant speed. Then, when the supply of the start signal ST is stopped, the supply of driving power to the sewing machine motor 32 is stopped, and the sewing machine motor 32 is stopped. Note that the T-type flip-flop 80
The automatic stop signals AS1 and AS2 outputted from the buttonhole controller 66 and the darning controller 68 are supplied via the OR gate 86, and the T-type flip-flop 80 is supplied with the automatic stop signals AS1 and AS2, respectively. At the same time, the sewing machine motor 32 is brought into a reset state and the sewing machine motor 32 is automatically stopped. Therefore, when a pattern other than buttonhole or darning is selected by operating the pattern selection push button 28, the input port P1 is selected in the multiplexer 64, and the input port P1 is selected in the first address memory 58.
The start address corresponding to the desired stitch pattern is supplied from the cursor to the stitch data generator 62 via the multiplexer 64. At this time, when the sewing machine motor 32 is rotated as the start/stop push button 30 is pressed, the timing signals TPF and TPB
is supplied to the stitch data generation device 62, and from the stitch data generation device 62, a series of stitch data for sewing a desired stitch pattern is supplied to the timing signal TPF.
and generated synchronously with TPB. At this time, since the input port PA of the multiplexer 70 is selected, the stitch data is supplied to the actuator driver 74 via the multiplexer 70. Therefore, the needle swing actuator 76
The feed actuator 78 determines the stitch position for each stitch in accordance with each stitch data, so that the desired pattern is sewn onto the work cloth. Here, the switching push button 31,
33 is operated to select manual mode, the width of the needle swing position is adjusted according to the amount of operation of the needle swing setting device 27, and the width of the needle swing position is adjusted according to the amount of operation of the feed setting device 29. The work cloth feed amount is adjusted. On the other hand, when the presser foot device 38 is attached to the presser bar 36, the switch device 52 is activated and the front end signal SFW and rear end signal SRE are supplied to the buttonhole controller 66 and the darning controller 68, respectively. The buttonhole controller 66 is the same as the sequence circuit for buttonhole sewing and bartack sewing described in the above-mentioned Japanese Patent Laid-Open No. 56-166888, so a detailed explanation will be omitted, but the first discrimination signal PS
1 is being supplied, for example, each start address for sewing each sewing step constituting buttonhole sewing can be set using the front end signal.
It is supplied to the second port P2 of the multiplexer 64 based on SFW, the rear end signal SRE, the timing signal TPF, the start signal ST and the end signal SSE of each step supplied from the stitch data generator 62. Note that a load signal SL is supplied from the buttonhole controller 66 to the stitch data generator 62 so that the start address output from the buttonhole controller 66 is loaded into an address counter (not shown) in the stitch data generator 62. ing. Therefore, when buttonhole stitching is selected by operating the pattern selection push button 28 and the start/stop push button 30 is operated, the multiplexer 64 is activated by the first discrimination signal PS1 output from the discriminator 60. Since the second input port P2 is selected, the leading address output from the buttonhole controller 66 is supplied to the stitch data generator 62 prior to each sewing step. When each step constituting the buttonhole stitch is sewn, a buttonhole stitch of a desired length corresponding to the set position of the adjustment plate 44 of the presser foot device 38 is formed on the work cloth. When the formation is finished, the sewing machine motor 32 is activated in accordance with the automatic stop signal AS1 output from the buttonhole controller 66
is automatically stopped. The length of the buttonhole sewing is determined as necessary and sufficient by sandwiching the actual button between the protrusions formed on the rear end of the adjustment plate 44 of the presser foot device 38 and the rear end of the presser frame body 40. It is now determined by the length of. Next, the darning controller 68 is configured as shown in FIG. 5, for example. That is, address signals representing addresses 1, 6, and 15 are sent from the address setter 88 to the first port P1 and the second port P of the multiplexer 90, respectively.
2 and the third port P3.
In the multiplexer 90, when a port select signal G1 is supplied, its input port P1 is supplied, when a select signal G2 is supplied, its input port P2 is supplied, and when a select signal G3 is supplied, its input port P1 is supplied. 3
Input port P3 is now selected,
Each address signal output from the address setter 88 is selectively supplied to the address counter 92. Those port select signals G
1, G2, and G3 are the timing signal TPF, the front end signal SFW, and the port selection signal generator 94.
Vertical stitches 166, horizontal stitches 168, and tacking stitches 1 that perform darning based on the backward signal SRE and the start timing signal SPT termination determination signal SED, which will be described later.
Port select signals G1, G2, and G3 are generated corresponding to the execution period of each of the 70 sewing steps. The port selection signal generator 94 is, for example, the sixth
It is configured as shown in the figure. That is, the output signal of the flip-flop 96, which is set to the set state by the activation timing signal SPT, is output as the port select signal G1, and the rear end signal SRE is outputted via the AND gate 98 opened by the port select signal G1. is the frequency division counter 10
0 and is counted there. The frequency division counter 100 has a count expiry value preset function.
When the count setting signal CSD representing the count setting value N is preset by the start timing signal SPT, the count progressive value of the trailing end signal SRE matches the preset count value N. At the same time as the count contents are returned to zero, a carry signal is supplied to the flip-flop 96, and the flip-flop 96 is brought into a reset state and the port select signal G1 is extinguished.
4 is also supplied, and these are set.
The output signal of the flip-flop 102 is used as a port select signal G2, and the timing TPF is supplied to a frequency division counter 108 through an AND gate 106 opened by the port select signal G2, and counted there. . The frequency division counter 108 is an octal frequency division counter, and the count contents are input to the input port of the comparator 110.
Supplied sequentially to the PC. “3” is input from the numerical value setter 112 to the input ports PA and PB of the comparator 110.
and “7” are respectively supplied, and in the comparator 110, the frequency division counter 108
The content of the signal supplied from is "3" or "7"
A match signal is generated when representing the AND gate 114 which is opened by the front edge signal SFW.
The signal is supplied to the mono-multi circuit 116 via. The monomulti circuit 116 supplies a pulse responsive to the generation of the coincidence signal to the flip-flop 102 to reset it, and outputs the port select signal G.
2 disappears, while supplying it to the flip-flop 118 to set it in the set state and generate the port select signal G3. This flip-flop 11
8 is brought into a reset state in accordance with the termination determination signal SED supplied via the AND gate 120 which is opened by the port select signal G3. That is, in the port selection signal generator 94,
In the process of vertical stitching 166, the trailing edge signal SRE is 8.
While the port select signal G1 is continuously generated until the port selection signal G1 is generated, the count content of the frequency dividing counter 108 is "3" or "7" in the horizontal stitching 168 that follows that process, in other words, the count content of the frequency division counter 108 is "3" or "7", in other words, the horizontal stitching 16
In the case of this embodiment in which the number of stitches 8 is composed of four stitches, the port select signal G2 is not generated until the position of the sewing needle 20 reaches the right end or left end and the front end signal SFW is generated. The port select signal G3 is continuously generated until the completion determination signal SED is generated at the tie stitch 170 following the horizontal stitch 168. Here, when the port select signal G2 is generated following the port select signal G1, the output signal of the flip-flop 104 is connected to the reset terminal of the frequency divider counter 108 to ensure that the contents of the frequency divider counter 108 are reset to zero. It has been entered. A pulse signal output from the monomulti circuit 122 in response to the fall of the timing signal TPF is supplied to the reset input terminal R of the flip-flop 104 via an AND gate 124 that is opened according to the output signal of the flip-flop 104. When the port select signal G2 is generated, the frequency division counter 108 is kept in a reset state until a certain period of time has elapsed from the fall of the timing signal TPF. Returning to FIG. 5, the address counter 92 has the following information:
A count signal SCK is supplied from a count signal generator 126. This supply signal SCK is
6, it is generated in synchronization with the timing signal TPF at the front end position or rear end position of the darning, while it is generated in response to the timing signal TPF when the horizontal stitch 168 or the tacking stitch 170 is performed. There is. That is, for example, as shown in FIG.
and an AND gate 130 opened by the front end signal SFW to an OR gate 132, and the output of the OR gate 132 is supplied to an AND gate 13 opened by the port select signal G1.
4 to the OR gate 136, and is used as the counting signal SCK. Further, the timing signal TPF is supplied to the OR gate 136 through an AND gate 138 opened by the port select signal G2 and an AND gate 140 opened by the port select signal G3, and is used as a count signal SCK. In FIG. 5, a starting signal ST is supplied to a mono multi-circuit 144 via an AND gate 142 that is opened by a front end signal SFW, and the mono multi-circuit 144 generates a constant pulse width in response to the starting signal ST. A start-up timing signal SPT is generated and supplied to the clear terminal CL of the address counter 92, while the OR gate 14
6 to a latch circuit 148, which will be described later.
Furthermore, it is supplied to a port selection signal generation circuit 94 and a latch circuit 164. Further, the load input terminal LD of the address counter 92 receives the output signal of the mono multi-circuit 150 that operates in response to the port select signal G3 and the termination determination signal SED.
It is supplied as a load signal SLD via an OR gate 152. The address counter 92 is a preset counter that counts the count signal SCK, and the count contents are cleared in response to the start timing signal SPT, and are selectively supplied from the multiplexer 90 in response to the load signal SLD. Load the address signal to be used. This address counter 92
is the darning data memory 15 as a storage device.
The forward feed and backward feed stitch information stored in advance in step 4 is sent to the rear end position signal SRE and the front end position signal.
A designating means for designating in response to the SFW is formed together with the count signal generator 126, and the count contents of the address counter 92 are stored in the darning data memory 154 in which darning stitch data as shown in Table 1 is stored in advance. A series of stitch data is sequentially generated by sequential addressing in response to the count signal SCK. The stitch data is composed of needle position data ND and feed data FD, respectively, and the feed data FD is directly supplied to the input port of the multiplexer 70 to PB, while the needle position data ND is supplied to the discriminator 156. , multiplexer 158 and latch circuit 14
The input port of said multiplexer 70 by 8
Supplied to PB.

【table】

[Table] In the discriminator 156, the needle position data
It is determined whether the content of ND is data specifically representing the needle position, a needle increment command, or an end command, and if it is needle position data, the port select signal SPS is sent.
is applied to multiplexer 158, causing its input port to switch from PH to PL. Furthermore, when the content of the needle position data ND is a needle increment command, a needle increment command signal SIN is supplied to the calculator 160. Further, when the needle position data FD is a termination command, the termination determination signal SED is supplied to the port selection signal generator 94, while the load signal SLD
It is supplied to the address counter 92 as a. On the other hand, in the needle position increment designation circuit 159 whose operation is permitted by the operation control signal ACM, the count setting signal CSD is sent to the frequency division counter 100 of the port selection signal generator 94 in response to the operation amount signal MPD. At the same time, a designation signal SIT indicating which of predetermined stages the intervals between the stitch rows are in and specifying the intervals prepared corresponding to that stage is output to the needle position increment setter 162. be done. The needle position increment designation circuit 159 is a type of memory, and is configured to operate the needle swing setting device 27 according to the desired value of the stitch row spacing of the vertical stitching 166 (as the width of the vertical stitching is constant, the vertical stitching 166), the number of vertical stitches 166 is set to a predetermined number, for example 7,
a count setting signal CSD as column number information determined to be one of 9, 11, 13, and 15, and the corresponding count setting value N indicating one of 3, 4, 5, 6, and 7;
A designation signal SIT is output that designates one of five levels of needle increment size corresponding to the spacing between the stitch rows. When this designation signal SIT is output to the needle position increment setter 162 in which interval information is stored,
The needle position increment setting device 162 sets the number of stitch rows to 7,
Needle position increments corresponding to 9, 11, 13, 15, for example, if the width of darning is 9 mm, 1.5, 1.13, 0.9,
A signal representing the needle increment of either 0.75 or 0.6 mm is output to the calculator 160, and a signal representing the calculation result is supplied from the calculator 160 to the first input terminal of the latch circuit 164. Note that the needle position increment designation circuit 159
If the actuation control signal ACM is not supplied to
A count setting signal CSD representing "7" is output, and a designation signal SIT designating the minimum stitch row interval is output.
is now being output. The contents of the latch circuit 164 are cleared in accordance with the activation timing signal SPT, and the contents of the latch circuit 164 are supplied to the input port PH of the multiplexer 158 and the second input terminal of the arithmetic unit 160. In accordance with the needle increment command signal SIN output from the discriminator 156, this calculator 160 changes the value represented by the signal supplied to its first input terminal to the value represented by the signal supplied to its second input terminal. It adds numbers. Therefore, each time the needle increment command signal SIN is supplied to the arithmetic unit 160, the output signal of the latch circuit 164 is made to be the value obtained by adding the value set by the needle position increment setting device 162. It's summery. As is clear from this, the count signal generator 126, the address counter 92, the darning data memory 15
The part where the needle increment command of No. 4 is stored, latch circuit 1
64, arithmetic unit 160, needle position increment setting device 162,
needle position increment designation circuit 159, A/D converter 83,
The potentiometer 81, needle swing setting device 27, etc.
Both position signals SFW, to generate interval information
It forms an interval setting means responsive to the SRE. The latch circuit 164 is configured to latch the addition result of the arithmetic unit 160 every time the addition operation of the arithmetic unit 160 is executed in accordance with a signal (not shown). The latch circuit 148 also outputs needle position data output from the multiplexer 158.
This is to send the ND to the multiplexer 70 in synchronization with the timing signal TPB, and to shift the timing at which the needle position data ND is outputted by approximately 180 degrees with respect to the feed data FD. Thereafter, in accordance with the operation of the pattern selection push button 28, the light emitting diode 24 arranged at the right end of the pattern display 26 is turned on, whereby darning is selected, and automatic is selected without operating the changeover push button 31. We will explain the operation when the In this case, in the discriminator 60, the second discrimination signal
Since PS2 is output, its input port PB is selected in multiplexer 70. For this reason, the needle swing actuator 76 and the feed actuator 78 are connected to the needle position data ND and the feed data output from the darning controller 68.
It will be driven according to FD. Further, since the operation control signal ACM is not supplied from the manual adjustment setting device 79 to the needle position increment designation circuit 159, the count setting signal CSD indicating that the count setting value N is "7" is sent from the needle position increment designation circuit 159 to the port. A designation signal SIT is supplied to the frequency division counter 100 in the selection signal generator 94 to make it an octal counter, while a designation signal SIT representing the minimum of the five steps of the hand position increment is supplied.
is supplied to the needle position increment setter 162, which causes the calculator 160 to output a signal representing an increment of, for example, about 0.6 mm. In addition, in such an initial state, the front end signal SFW is sent from the switch device 52.
is being output. In the above state, the start/stop push button 30
When the sewing machine motor 32 is activated in accordance with the operation, first, according to the start timing signal STP,
While the flip-flop 96 is set to the set state and the port select signal G1 is generated, the contents of the address counter 92 are cleared, so that the address 0 of the darning stitch data in the first table stored in the darning data memory 154 is It is specified. Therefore, the needle position data ND representing the initial position L1 is sent to the discriminator 156 from the darning data memory 154.
and is supplied to the multiplexer 158, and the feed data FD representing the feed amount in the backward direction by a predetermined amount (for example, about 2 mm) is supplied to the multiplexer 70.
supplied to Since the discriminator 156 discriminates that the content of the needle position data ND is data representing a specific needle position L1, the multiplexer 1
At 58, the input port PL is selected according to the port select signal SPS, while at the latch circuit 148, hand position data representing the hand position L1 is latched according to the activation timing signal SPT, and the contents of the latch are sent to the multiplexer 70. supplied to As a result, the stitch shown at S1 in FIG. 8 is formed first, and then the backward feed stitch row is formed at a predetermined backward pitch until the trailing edge signal SRE is generated. In the above state, when the rear end signal SRE is generated from the switch device 52 and the stitch S2 is formed, the count content of the frequency division counter 100 in the port selection signal generator 94 is set to 1, and a count signal is generated. Counting signal from the device 126
SCK is generated, and the count content of address counter 92 is set to 1. As a result, address 1 of the data shown in Table 1 stored in the darning data memory 154 is specified, and feed data FD with a feed amount of zero is output from the darning data memory 154, and the needle increment command is outputted from the darning data memory 154. Position data ND is provided from darning data memory 154 to discriminator 156 and multiplexer 158. At this time, since the needle increment command signal SIN is generated from the discriminator 156, the arithmetic unit 160 adds the needle increment (for example, about 0.6 mm) set in the needle position increment setting device 162 to the previous content. , a value corresponding to one needle increment is latched in latch circuit 164. Here, since the content of the needle position data LD does not indicate a specific needle position, the input port PH is selected in the multiplexer 158, and the latch content of the latch circuit 164 is sent to the latch circuit 148 through the multiplexer 158. is transferred and is now latched in response to timing signal TPB. Therefore, the signal supplied to the actuator driver 74 has signal content for moving the needle one increment (about 0.6 mm), while the content of the feed signal SF indicates that the feed amount is zero. to seam S in Figure 8
S3 is formed following S2. Since the position of the stitch S3 in the workpiece cloth feeding direction coincides with that of the stitch S2, the rear end signal SRE is still generated from the switch device 52, and in this state, the timing signal
When TPF is subsequently generated, a count signal SCK is further supplied from the count signal generator 126 to the address counter 92, and the contents of the address counter 92 are set to two. As a result, address 2 of the darning data memory 154 is designated, and the darning data memory 154 outputs the feed data FD representing a predetermined amount of feed (approximately 2 mm) in the forward direction, as well as the needle fixing command. location data
ND is discriminator 156 and multiplexer 158
supplied to Since the content of the needle position data ND is a needle fixing command, the port select signal SPS is not output from the discriminator 156. For this reason, multiplexer 158 has its input port as before.
PH remains selected. Moreover, since the needle increment command signal SIN is not output from the discriminator 156, the contents of the latch circuit 164 are not changed, and the same contents as the previous time are latched in the latch circuit 148 again, and the contents of the needle position data ND are changed to the needle position L1. The content is determined by adding the dimension of one needle increment (approximately 0.6 mm) to the value. As a result, the forward feed stitch row is formed at a predetermined pitch (approximately 2 mm) until the front end signal SFW is generated from the switch device 52. That is, at the time of forming the stitch S3, the forward feed stitch row (stitch S
The forward feed stitch information for sewing 3 to S4) is specified. Subsequently, when the front edge signal SFW is generated at the same time as the stitch S4 in FIG. At the same time as the feed data FD is output,
Needle position data ND representing a needle increment command is output. As a result, the needle increment output from the needle position increment setter 162 is newly added to the value corresponding to one needle increment already latched in the latch circuit 164 in the arithmetic unit 160, and the latched contents of the latch circuit 164 are changed. The value corresponds to two needle increments. As a result, the contents of latch circuit 164 are changed to latch circuit 1.
48 via multiplexer 158 and supplied to actuator driver 74 is set to a value corresponding to two needle increments;
Stitch S5 in FIG. 8 is formed. Next, seam S
After the formation of 5, a count signal is sent to the address counter 92.
As SCK is further supplied, address 4 of the darning data memory 154 is designated, and a backward feed stitch row following stitch S5 is formed at a predetermined (approximately 2 mm) backward pitch until the backward signal SRE is generated. , at the same time as the rear end signal SRE is generated, the stitch S6 is
is formed. That is, at the time of forming stitch S5, the backward feed stitch row (stitch S5
- Backward feed stitch information for sewing S6) is specified. Then, at the same time as the stitch S6 is formed, the address counter 92 is further counted, and address 5 of the darning data memory 154 is designated. As a result, the needle position data ND representing the end command is determined by the discriminator 1.
56, the end determination signal SED is generated from the discriminator 156, and the load signal SLD is supplied to the address counter 92. At this time, the port select signal G1 representing the vertical stitching period is generated, and the signal representing the 1st address set in the address setter 88 is supplied from the multiplexer 90 to the address counter 92. The signal representing is loaded into address counter 92. Therefore, the seam S
The stitches continuing from 2 to S5 are again repeatedly formed starting from stitch S6. Note that when the stitch S6 is formed and the trailing edge signal SRE is generated,
The count content of the frequency division counter 100 is set to 2. While the above operations are repeated, the frequency division counter 1
The count content of 00 reaches "8" and vertical stitch 166
When sewing is completed, in other words, when the formation of stitch S30 in FIG.
Since a carry signal is generated from the flip-flop 96, the flip-flop 96 is set to a reset state and the port select signal G1 is eliminated, while the flip-flop 102 is set to a set state and a port select signal G2 is generated. Therefore, the AND gates 106 and 138 are opened, and the timing signal TPF is output in the frequency division counter 108.
are counted continuously. At this time, since the second port P2 of the multiplexer 90 is selected by the port select signal G2, the address counter 92 selects the stitch S
After 30 is formed, at the same time as the count becomes "5", an address signal indicating address 6 is loaded,
Thereafter, the contents of the count are changed to "7" and "8", and addresses 6 and 7 of the darning data memory 154 are changed.
The address and number 8 are designated one after another. As a result, the content of the feed data FD is maintained as representing zero feed amount, while the content of the needle position data ND is maintained at the needle position L.
3, L2, and L1, respectively, so that the stitch in the direction perpendicular to the feed direction of the work cloth follows stitch S30, and the needle positions L3, L2, and L1
Stitches S31, S32, and S33 are formed to the left in this order. Next, the darning data memory 154
When address 9 is designated, the contents of the needle position data ND are assumed to represent the needle position L1, and the contents of the feed data FD are assumed to represent a predetermined feed amount (approximately 1 mm) in the forward direction. Therefore, one stitch S34 is made in the forward direction at the same needle position L1.
is formed. Then, as addresses 10, 11, 12, and 13 in the darning data memory 154 are further specified, stitches S at needle positions L2, L3, and L4 are specified.
35, S36, and S37 are formed in the right direction. Note that in FIGS. 8 and 9, the right and left sides in the drawings are the front and rear sides as seen from the operator, and the upper and lower sides are the right and left sides as seen from the operator. When the stitch S38 in FIG. 9 is formed and address 14 of the darning data memory 154 is specified, the content of the needle position data ND is assumed to represent a termination command, so the discriminator 156 determines whether the stitch is finished or not. The signal SED is output, and the load signal SLD is supplied to the address counter 92. At this time, the port selection signal generator 94 outputs the port selection signal G2.
is supplied to the multiplexer 90, the address signal representing address 6 output from the address setter 88 is selected from the multiplexer 90 and supplied to the address counter 92.
Therefore, a signal representing the 6th address is loaded into the address counter 92, and the stitch data following the 6th address is then output again from the darning data memory 154 in synchronization with the timing signal TPF. Therefore, a series of stitches continuing from stitches S30 to S38 are repeatedly formed with stitches S38 as a new starting point, and horizontal stitches 168 shown in FIG. 9 are formed overlapping vertical stitches 166 in FIG. It will be done. In the process of forming the horizontal stitch 168, when the count content of the frequency dividing counter 108 becomes "3" or "7", in other words, when the needle position becomes L1 or L4, a coincidence signal is sent from the comparator 110 to the AND gate 114. has been repeatedly supplied. In a state where such a coincidence signal is being generated, horizontal stitching 168 is executed by a predetermined amount, and the switch device 52
When the front end signal SFW is generated from
A predetermined pulse signal from 6 to flip-flop 10
The flip-flop 102 is set to the reset state and the port select signal G2 is eliminated, while the flip-flop 118 is set to the set state and the port select signal G3 is generated. FIG. 9 shows this state in which the seam SN is formed. When the port select signal G3 is generated, the port P3 of the multiplexer 90 is selected, and the signal representing address 15 set in the address setter 88 is sent to the address counter 9.
Meanwhile, the load signal SLD is supplied to the address counter 92 in accordance with the output signal of the monomulti circuit 150 activated in response to the port select signal G3, and the contents of the address counter 92 are set to "15". . Therefore, the address counter 9
The content of 2 is “15” in synchronization with the timing signal TPF.
, and the darning data memory 154 is designated as addresses 15, 16, and 17.
At this time, the content of the needle position data ND is taken as a needle fixing command, so the actual needle position is L4 or L1.
(L1 in this embodiment), while the content of the feed data FD is a minute amount in the backward direction.
Following the stitch SN, a stitch slightly spaced apart in the backward direction is formed. In this way, the tacking stitch 170 shown in FIG. 9 is formed. When address 19 of the darning data memory 154 is designated, the contents of the needle position data ND are used as an end command, so the discriminator 156 outputs an end determination signal SED, and the AND gate 120 is opened. For this reason,
Flip-flop 118 is brought into a reset state and port select signal G3 is eliminated. At the same time, an automatic stop signal AS2 is supplied from the mono multi-circuit 172, which operates in synchronization with the falling edge of the port select signal G3, to the T-type flip-flop 80 via an OR gate 86.
Since 0 is considered to be a reset state, the sewing machine motor 32
is automatically stopped. Note that the tacking stitch 170 in FIG. 9 is shown at needle position L for ease of understanding.
Although it is drawn shifted downward from 1 in the figure, it is actually formed overlapping the needle position L1. In this way, according to this embodiment, in the vertical stitching 166 that basically constitutes the darning, the lengths of the forward feed stitch row and the backward feed stitch row are determined by the switch device 5.
Since it is determined according to the front end signal SFW and rear end signal SRE generated from 2, regardless of the dispersion of the feed efficiency of the feed dog in the forward direction and backward direction with respect to the workpiece cloth, accurately located. Therefore, in order to form the front and rear ends of the darning beautifully, there is no need to adjust the feed amount in the forward and backward directions or to test stitch, making it extremely easy to form beautiful darning stitches. . Next, when a thick thread is used in the darning as described above, a case will be described in which the intervals between the stitch rows of the vertical stitches 166 are widened in order to prevent the thread from clogging. First, the switching push button 31 is pressed and the LED
35 is turned on and switched to manual mode.
At this time, the second discrimination signal PS2 is transmitted to the manual adjustment setting device 7.
9, the analog switch 75 is in a state where the output of the voltage divider 71 is selected, as in the case where automatic is selected. In this state, the needle swing setting device 27 as an operating body is operated according to the thickness of the thread to be used, and the interval between the stitch rows, in other words, the number of stitch rows is set. Since the operation amount of the needle swing setting device 27 is supplied to the needle position increment designation circuit 159 as the operation amount signal MPD, the needle position increment designation circuit 159 performs a count corresponding to the operation amount of the needle swing setting device 27. The setting signal CSD and the designation signal SID are supplied to the frequency division counter 100 and the needle position increment setter 162. For example, when the widest interval is set in the needle swing setting device 27, the count setting signal CSD indicating that the count setting value N is "3" is supplied from the needle position increment designation circuit 159 to the frequency division counter 100, Further, a designation signal SID specifying the widest interval among the five types of intervals is supplied to the needle position increment setter 162, and a signal representing an interval of, for example, 1.5 mm is supplied to the calculator 162 from the needle position increment setter 162. Ru. In the above state, when the start/stop push button 30 is operated and the sewing machine motor 32 is started, a count setting value representing "3" is loaded into the frequency division counter 100, and the frequency division counter 100 is set to 4.
On the other hand, the stitch S1' in FIG.
is formed. Following the stitch S1', a backward feed stitch row is formed at a predetermined stitch pitch in the same manner as described above, and a stitch S2' is formed at the same time as the trailing edge signal SRE is generated. At this time, as in the case described above, since the needle position data ND represents the needle increment command, the data output from the latch circuit 164 is transmitted to the needle position increment setting device 162 by the operation amount of the needle swing setting device 27. Since the distance is approximately 1.5 mm set according to . At this time,
The count content of the frequency division counter 100 is set to "1". Then, as in the previous case, the seam S
3', a forward feed stitch row is formed, a stitch S4' is formed at the same time as the front end signal SFW is generated, and a stitch S5' is formed subsequently. Then, a backward feed stitch row is formed again following the stitch S5', and the stitch S is formed at the same time as the rear end signal SRE is generated.
6' is formed, and the count content of the frequency division counter 100 is set to "2". Then, the stitches of steps S2' to S6' are formed again with the stitch S6' as a new starting point, and the count content of the frequency division counter 100 becomes "4". When the vertical stitch row is formed from 100 until the carry signal is output, the vertical stitch 1 in Figure 10
66 will be completed. In this way, according to this embodiment, a darning stitch having the same width as the previous one is formed, but depending on the thickness of the thread used, the vertical stitch 16, which basically constitutes the darning stitch, is formed.
Since the number of stitch rows 6 can be reduced and the spacing can be increased, thread jams during darning can be reliably eliminated. Here, in the circuit shown in FIG. 3 described above, a part or all of the circuit surrounded by a chain line may be configured as a so-called microcoipulator. Further, the switch device 52 that outputs the front end signal SFW and the rear end signal SRE can be configured not only in a contact type but also in a non-contact type or a photoelectric type. Furthermore, various forms of the presser foot device 38 can be adopted. In short, any device that detects the actual amount of movement of the work cloth and generates signals at predetermined front and rear end positions is sufficient. The above-mentioned embodiment is merely one embodiment of the present invention, and various modifications may be made to the present invention without departing from the spirit thereof.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of a sewing machine to which the present invention is applied. FIG. 2 is a partially cutaway perspective view showing in detail the vicinity of the head of the embodiment shown in FIG. 1. FIG. 3 is a block diagram showing a circuit provided in the embodiment of FIG. 1. FIG. 4 is a timing chart illustrating timing signals output from the timing signal generator of FIG. 3. FIG. 5 is a block diagram showing the configuration of the darning controller shown in FIG. 3. FIG. 6 is a block diagram showing the configuration of the port selection signal generator of FIG. 5. FIG. 7 is a block diagram showing the configuration of the count signal generator of FIG. 5. 8 and 9 are views respectively showing warp stitches and cross stitches constituting one sewing step of the darning stitch formed by the embodiment of FIG. 1. FIG. 10 shows an eighth example of vertical stitching formed by the embodiment shown in FIG. 1, in which the stitch row interval is expanded and the number of stitch rows is reduced.
FIG. 27: Needle swing setting device (operating body) (interval setting means), 81: Potentiometer (interval setting means),
83: A/D converter (interval setting means), 92: Address counter (specifying means) (interval setting means), 1
26: Counting signal generator (specifying means) (interval setting means), 154: Darning data memory (interval setting means), 159: Needle position increment specifying circuit (row number setting means) (interval setting means), 160: Arithmetic circuit (interval setting means), 162: needle position increment setting device (interval setting means), 38: presser foot device (vertical stitching length setting device), 52: switch device (vertical stitching length setting device), 68: darning controller (control means), 154: darning data memory (storage device).

Claims (1)

[Scope of Claims] 1. A forward feed stitch row comprising a sewing needle capable of vertical reciprocating motion and horizontal rocking motion, and a feed dog capable of forward and backward feeding motion, and extending in both forward and backward feeding directions of the feed dog. and a sewing machine capable of performing darning in which backward feed stitch rows are formed alternately at intervals in the swinging direction of the sewing needle, forward feed stitch information and backward feed stitch information for forming both said stitch rows, respectively. a storage device that stores stitch information; and a storage device that generates a front end position signal and a rear end position signal that respectively correspond to the front and rear end positions of the darning in order to determine the length of the darning in the feeding direction of the feed dog. darning length setting means; and an operating section operable for setting and changing the spacing between the two stitch rows; and a darning stitch length setting means for each of the two position signals to generate spacing information regarding the set spacing. and a spacing setting means that specifies the forward feed stitch information in connection with generation of spacing information from the spacing setting means that responds to the trailing edge position signal, and a spacing setting means that responds to the leading edge position signal. a designating means for designating the backward feed stitch information in connection with generation of interval information; and a number of rows determined based on a predetermined width of the darning in the swinging direction of the sewing needle and the set interval. a control means for operating the spacing setting means and the specifying means while both stitch rows are being formed, forming each stitch row according to the specified stitch information and setting the spacing. A sewing machine capable of darning, characterized in that the spacing between the two stitch rows is determined according to spacing information from a means. 2. The control means includes a row number designation means for generating row number information for determining the number of both stitch rows formed in the fixed width darning according to an operation of the operation section, The spacing setting means and the specifying means are operated so that the series of operations of generating the spacing information and specifying the stitch information is repeated a number of times according to the row number information. A sewing machine capable of darning as described in item 1.