JPH0121995B2 - - Google Patents

Description

[Detailed description of the invention]

TECHNICAL FIELD The present invention relates to a sewing machine capable of darning, and more particularly to a technique for preventing thread jams from occurring when changing the width of 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, it is common for a fixed number of vertical stitches to be formed in a darning to be formed, and if the width of the darning is made smaller according to the area to be darned, thread jams may occur. There was a risk that this would occur. Purpose of the Invention The present invention has been made against the background of the above circumstances, and its object is to provide a sewing machine capable of darning which prevents thread jamming from occurring regardless of changes in the width of the darning. Our goal is to provide the following. Structure of the Invention In order to achieve the above object, the gist of the present invention is as follows: (1) Forward feed stitch information and backward feed stitch information for forming forward feed stitch rows and backward feed stitch rows, respectively. (2) generating a front end position signal and a rear end position signal corresponding to both 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; (3) generating means for generating spacing information regarding a predetermined row spacing of both the stitch rows in response to each of the two position signals; (4) the rear end; The forward feed stitch information is designated in connection with the generation of spacing information from the generating means responsive to the position signal, and the backward feed stitch information is specified in connection with the generation of spacing information from the generating means responsive to the leading edge position signal. (5) an operation unit operable to set the width of the darning in the direction of swing of the sewing needle; (6) the set width of the darning and the predetermined width of the darning; A control means for operating the generating means and the specifying means while the number of both stitch rows determined based on a predetermined row interval is being formed. Effects of the Invention With this, when darning is performed according to the stitch information specified by the specifying means, the intervals between the stitch rows are set to the predetermined intervals, so the darning Even if the width is changed by the operation section, the distance between the stitch rows is maintained at a predetermined interval that does not cause thread jams. Therefore, regardless of the change in the width of the darning, thread jams are completely eliminated. 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 is provided on the front surface of the head 16 to start or stop the sewing machine each time it is pressed, and a speed setting device is provided on the pedestal 12 to set the rotational speed of the sewing machine motor 32. 34 are 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 frame body 42 that is slidably engaged with the presser frame body 40 in the 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.
is 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 PS2.
Further, the second discrimination signal P2 is transmitted to a darning controller 68 as a control means for controlling the formation of darning.
is also supplied to multiplexer 70, and its input port PB is supplied to multiplexer 70.
let them choose. The stitch data generator 62 is supplied with timing signals TPF and TPB from a timing generator 72 according to the timing shown in FIG. A series of stitch data stored at the address below is generated in synchronization with the timing signals TPF and TPB,
These are the multiplexer 70 and the D/A converter 6.
9, is supplied to the actuator driver 74 via analog switches 75 and 77. These analog switches 75 and 77 selectively select the output signal of the D/A converter 69 and the output signals of the needle swing setting device 27 and the feed setting device 29 and output the selected signals to the actuator driver 74. It is something. 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. The D/A converter 69 outputs an output signal centered around zero V, for example, a signal in the range of +5V to -5V, and the analog switches 75, 7
7 selects the output of the needle swing setting device 27 and the feed setting device 29 when switched to the manual side, so for example, the actuator driver 74
Analogized needle position data SN supplied to
In accordance with the operation of the needle swing setting device 27, the amplitude around zero V is adjusted to a desired value in the direction of decrease compared to when switching to the automatic side. Therefore, when adjusting the width of the darning stitch, which will be described later, the width of the darning stitch is adjusted by changing the uniform distribution dimension from the center line. Actuator driver 74
In this case, 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. Further, the feed actuator 78 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.
The output from the D/A converter 69, the needle swing setting device 27, and the feed setting device 29 are selectively selected, respectively, and the LEDs 35 and 37 are lit to indicate that the manual side has been selected. They are made to do so. Furthermore, in the manual adjustment setting device 79, when the first discrimination signal PS1 indicating that buttonhole stitching has been selected is supplied, output for switching the analog switch 75 to the manual side is prohibited, and darning is prohibited. The output for switching the analog switch 75 to the manual side is prohibited when a second discrimination signal PS2 indicating that the stitch has been selected and a port select signal G1 (described later) indicating the vertical stitching step are both supplied. . 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 of step 1, an actuation control signal ACM is generated, and the actuation control signal ACM is supplied to a darning controller 68. . The needle swing setting device 27 is used as an operation section for setting the width dimension of vertical stitching when darning is selected. Further, a potentiometer 81 operatively connected to the needle swing setting device 27 and an A/D converter 83 for converting the output signal of the potentiometer 81 into a digital quantity are provided. When the swing setting device 27 is used as the operating body,
An operation signal MPD representing the amount of operation 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 5.
8 supplies the start address corresponding to the desired stitch pattern to the stitch data generator 62 via the multiplexer 64. At this time, start/stop push button 30
When the sewing machine motor 32 is rotationally driven as is pressed, the timing signals TPF and
The TPB is supplied to the stitch data generator 62, and the stitch data generator 62 outputs a timing signal as a series of stitch data for sewing a desired stitch pattern.
Generated synchronously with TPF and TPB. At this time, multiplexer 70 has its input port
Since PA is selected, the stitch data is sent to the actuator driver 7 via the multiplexer 70.
4. Therefore, the stitch position for each stitch is determined by the needle swing actuator 76 and the feed actuator 78 in accordance with each stitch data, and the desired pattern is sewn onto the work cloth. There is. Here, when the switching pushbuttons 31 and 33 are operated to select manual, the needle position is adjusted according to the operation amount of the needle swing setting device 27, and the needle position is adjusted according to the operation amount of the feed setting device 29. The work cloth feed amount is adjusted accordingly. 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 buttonhole controller 66 is connected to an address counter (not shown) in the stitch data generator 62.
A load signal SL is supplied from the buttonhole controller 66 to the stitch data generator 62 so that the leading address output from the buttonhole controller 66 is loaded. 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 can be 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. Next, the darning controller 68 is configured as shown in FIG. 5, for example. That is, from the address setter 88, addresses 1, 6,
Address signals representing addresses 15 and 15 are respectively supplied to the first port P1, second port P2, and third port P3 of the multiplexer 90. In the multiplexer 90, the port select signal G
1 is supplied to the input port P1, and when the select signal G2 is supplied to the input port P2, the input port P2 is supplied with the select signal G.
3 is being supplied, the third input port P3 is selected, and each address signal output from the address setter 88 is selectively supplied to the address counter 92. ing. Those port select signals G1, G
2, G3 is a port selection signal generator 94 that outputs a timing signal TPF, a front end signal SFW, a rear end signal SRE, and an activation timing signal to be described later.
Vertical stitch 166, horizontal stitch 168, and tacking stitch 1 that constitute darning stitches based on SPT and end determination signal SED
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 end 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 division 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 port selection signal G1 is
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 cross 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 opened by a front end signal SFW, and in the mono multi-circuit 144, a constant pulse width is activated in response to the starting signal ST. A 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.
Additionally, it is provided to a port selection signal generator 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 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, and the feed data FD is directly supplied to the input port PB of the multiplexer 70, while the needle position data ND is supplied to the discriminator 156.
Multiplexer 158 and latch circuit 148 connect input port PB of multiplexer 70 to
is supplied to.

【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, the needle position increment designation circuit 159 whose operation is permitted by the operation control signal ACM outputs a count setting signal CSD in response to the operation amount signal MPD.
is the frequency division counter 10 of the port selection signal generator 94
At the same time, an initial position designation signal SIS indicating which of a plurality of predetermined initial positions of the sewing needle 20 belongs is supplied to the initial position setter 161. In order to keep the darning stitch row spacing constant when performing darning of the desired width set by the needle swing setting device 27, the appropriate number of stitch rows for the width of the darning, e.g. 15, 13, 11,
Either 9 or 7 is predetermined, and the count setting signal CSD is set to 7, 6, or 7 in accordance with data stored in advance in the needle position increment designating circuit 159 so that the appropriate number is formed. 5,
It is assumed that the count setting value is either 4 or 3. The initial needle position setter 161 stores a plurality of predetermined initial positions so that their center lines coincide with each other regardless of changes in the width dimension of the darning, and the initial position designation signal SIS is A signal representing the specified initial position, in other words, a signal representing the position from the center line of the darning when the desired width of darning set by the operation of the needle swing setting device 27 is executed is sent to the computing unit 160. supplied to The calculator 160 also includes a setting signal representing a constant needle increment setting value (a value corresponding to the stitch row spacing) in a predetermined needle swing direction to prevent thread jams. The output signal is supplied from the latch circuit 162, and the output signal thereof is supplied from the latch circuit 164.
In response to this, a signal representing the initial position from the initial position setter 161 is loaded, and the loaded content is output and latched in the latch circuit 164.
This latch circuit 164 latches the output signal of the arithmetic unit 160 in accordance with a signal (not shown) every time a load or addition operation is executed in the arithmetic unit 160, and transfers the latched contents to the multiplexer 158.
It outputs to the input port PH of and the arithmetic unit 160. As a result, the computing unit 160 receives the setting signal from the needle position increment setting device 162 and the latch circuit 1 every time the needle increment command signal SIN is supplied.
64 are added together, and the result of the addition is latched by a latch circuit 164. That is, the signal output from the latch circuit 164, in other words, the interval information regarding the interval between stitch rows, is initially set to the value represented by the signal output from the initial needle position setter 161, and then is set to the value representing the needle increment command. Every time the needle position data ND is output from the darning data memory 154, the setting value represented by the setting signal output from the needle position increment setter 162 is added to the value. As is clear from this, the counting generator 126, the address counter 92, the location where the needle increment command is stored in the darning data memory 154, the latch circuit 164, the arithmetic unit 160, the needle position increment setting device 162, etc. are used to store the interval information. It forms a generating means that generates in response to both the position signals SFW and SRE. It should be noted that the needle position increment designation circuit 159 operates at the maximum width (for example, 15 A count setting signal CSD representing a count setting value N of "7" is output so that a darning of 9 mm width (consisting of the vertical stitching of a book) is performed, while a count setting signal CSD representing a count setting value N of "7" is outputted at the farthest position from the center line (for example, 4.5mm) is now output. Additionally, the latch circuit 148 is connected to the multiplexer 1
This is to send the needle position data ND output from 58 to the multiplexer 70 in synchronization with the timing signal TPB, and to shift the timing at which the needle position data ND is output 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 in which the count setting value N is, for example, "7" is supplied from the needle position increment designation circuit 159. The signal is supplied to the frequency division counter 100 in the port selection signal generator 94 and used as an octal counter, while an initial position designation signal SIS designating the farthest position from the center line is output and the initial hand position is output. Setting device 161
A signal representing a position 4.5 mm away from the center line, for example, is supplied to the computing unit 160 from the center line. Note that in such an initial state, the front end signal SFW is output from the switch device 52. In the above state, when the sewing machine motor 32 is operated in accordance with the operation of the start/stop pushbutton 30, the flip-flop 96 is set to the set state in accordance with the start timing signal STP, and the port select signal G1 is generated. Since the contents of the address counter 92 are cleared, address 0 of the darning stitch data in Table 1 stored in the darning data memory 154 is designated. Therefore, the needle position data ND representing the initial position command is supplied from the darning data memory 154 to the discriminator 156 and the multiplexer 158, and the feed data FD representing the backward feed amount by a predetermined amount (for example, about 2 mm) is supplied to the discriminator 156 and the multiplexer 158. is multiplexer 70
is supplied to Since the discriminator 156 determines that the content of the needle position data ND is neither data representing a specific needle position nor a needle increment command nor an end command, the multiplexer 158 selects the input port PH. On the other hand, the latch circuits 148 and 164 latch needle position data representing the needle position farthest from the center line output from the arithmetic unit 160 in accordance with the activation timing signal SPT, and the contents of the latches are supplied to the multiplexer 70. Ru. As a result, the stitch shown at S1 in FIG.
A backward feed stitch row is formed at a predetermined backward pitch until a backward stitch 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 the count A count signal SCK is generated from the signal generator 126 and the address counter 92
The count content of is set to "1". As a result, address 1 of the data shown in Table 1 stored in the darning data memory 154 is designated, and the feed data FD with a feed amount of zero is stored in the darning data memory 154.
At the same time, needle position data ND representing the needle increment command is supplied from the darning data memory 154 to the discriminator 156 and the multiplexer 158. At this time, since the needle increment command signal SIN is generated from the discriminator 156, the arithmetic unit 16
At 0, the needle increment (for example, about 0.6 mm) set in the needle increment setter 162 is added to the previous content, and a value corresponding to one needle increment is latched in the 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. From this, a stitch S3 is formed following the stitch S2 in FIG. 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, the count signal SCK is further supplied from the count signal generator 126 to the address counter 92, and the content of the address counter 92 is set to "2". As a result, address 2 of the darning data memory 154 is designated, and from the darning data memory 154, feed data FD representing a predetermined feed amount (approximately 2 mm) in the forward direction is stored.
is output, and needle position data ND representing the needle fixing command is supplied to the discriminator 156 and the multiplexer 158. 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 remains with its input port PH selected as before. 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, stitch S3
At the time of formation, forward feed stitch information is specified for sewing a forward feed stitch row (stitches S3 to S4) that forms stitches in the folded front end direction in response to the generation of the trailing edge signal SRE. be. 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 content of the latch circuit 164 is changed. The value corresponds to two needle increments. As a result, the contents of latch circuit 164 are
8 via multiplexer 158,
The content of the data supplied to the actuator driver 74 is a value corresponding to two needle increments, and the eighth
The stitch S5 shown in the figure is formed. Subsequently, after forming the stitch S5, a count signal SCK is sent to the address counter 92.
is further supplied, so 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 trailing edge signal SRE is generated. ,
Stitch S6 is formed simultaneously with the generation of trailing edge signal SRE. That is, at the time of forming stitch S5, the backward feed stitch row (stitches S5 to S6) forms a stitch in the folded backward direction in response to the generation of the front edge signal SFW.
Backward feed stitch information for sewing 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. . In the above-described darning, a case will be described in which the width of the darning is changed to a smaller value by changing the area where the darning is applied. First, the switching push button 31 is pressed and the LED
35 is turned on and switched to manual mode.
In this state, the needle swing setting device 27 as an operating body is operated, and the width of the darning to be applied is set to a desired size. 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, so the needle position increment designation circuit 159 performs a count according to the operation amount of the needle swing setting device 27. The setting signal CSD and the initial position designation signal SIS are supplied to the frequency division counter 100 and the initial hand position setter 161. For example, when the darning width is set to the narrowest dimension in the needle swing setting device 27, the needle position increment designation circuit 159 outputs the count setting value N, which is a count setting signal CSD representing "3".
is supplied to the frequency division counter 100, and an initial position designation signal SIS specifying the position having the smallest distance from the darning center line CL is supplied to the initial needle position setter 1.
61, and from the initial needle position setter 161, a signal representing an initial needle position spaced, for example, by 1.8 mm from the center line CL is supplied to the calculator 160. In the above state, the start/stop push button 30 is operated, the sewing machine motor is started, and at the same time, a count setting value representing "3" is loaded into the frequency division counter 100, and the frequency division counter 100 becomes a quaternary counter. . On the other hand, the center line CL is stored in the arithmetic unit 160.
A signal spaced, for example, 1.8 mm is loaded from and latched in latch circuit 164. At this time, the zero address is specified in the darning data memory 154, and since the contents of the needle position data ND output therefrom are neither specific needle position data, needle increment command, nor end command, the multiplexer 158 inputs the needle position data ND. Since the port PH is selected, the output signal of the latch circuit 164 is also latched in the latch circuit 148, and as a result, the stitch S1' in FIG. 9 is formed at the initial needle position 1.8 mm away from the center line CL. Ru. Following this 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,
When address 1 of the darning data memory 154 is specified, the needle position data ND represents the needle increment command as in the case described above, so the latch circuit 1
The data output from the needle position 64 is obtained by adding a certain needle increment preset by the needle position increment setting device 160, for example, an interval of about 0.6 mm to the initial needle position. Therefore, the stitch S3' following the stitch S2' is formed at a position 0.6 mm away from the stitch S2' toward the center line CL in the direction perpendicular to the feed direction of the work cloth. And the frequency division counter 100
The count content of is set to "1". Then, as in the case described above, a forward feed stitch row is formed following stitch S3', and the front end signal is
Simultaneously with the generation of SFW, stitch S4' is formed and stitch S5' is formed, and following the stitch S5', a backward feed stitch row is formed, and at the same time as the trailing edge signal SRE is generated, stitch S6 is formed. ' is formed, and the count content of the frequency division counter is set to "2". Subsequently, the stitches of steps S2' to S6' are stitches S
6' as a new starting point, and a stitch row is formed until the content of the frequency division counter 100 becomes "4", in other words, until the carry signal is output from the quaternary frequency division counter 100. , the vertical stitch 166 in FIG. 9 is completed. Subsequently, as in the case described above, a horizontal stitch is formed overlapping the vertical stitch 166, but at this time, the supply of the port select signal G1 that was being supplied to the manual adjustment setting device 79 is stopped, and the analog switch 75 is turned off. is switched to manual mode. For this reason, D/
The analog signal supplied from the A converter 69 to the actuator driver 74 is reduced in signal value by the needle swing setting device 27 according to the setting amount. Therefore, the content of the needle position data ND output from the darning data memory 154 is the needle position L.
Even if the data represents 1, L2, L3, L4,
The actual needle position is moved closer to the center line CL side according to the amount of operation in the needle swing setting device 27, and the horizontal stitch 1
The right end and left end of 68 are made to coincide with the right end stitch row and left end stitch row of vertical stitching 166. As described above, according to this embodiment, when the width dimension of the darning is changed, the number of vertical stitch rows that basically constitute the darning is adjusted accordingly,
Since the spacing between the stitch rows is kept constant, thread jams are completely eliminated. Further, according to this embodiment, even if the width dimension of the darning is changed, the position of the center line of the darning remains constant, so there is an advantage that setting of the work cloth is extremely easy. Here, in the circuit shown in FIG. 3 described above, a part or all of the circuit surrounded by a chain line is also constituted by a so-called microcomputer. Further, in the above-described embodiment, the needle swing setting device 27
Although the width dimension of the darning stitch is configured to be adjusted only in the decreasing direction from the maximum value, it is also configured so that the width dimension of the darning stitch can be adjusted in the increasing direction and decreasing direction during automatic switching. You get it. When adjusting the width dimension of the darning in an increasing direction, the number of stitch rows constituting the vertical stitching may be kept constant, and the spacing between the stitch rows may be increased beyond a value that does not cause thread jams. It is. 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 the vicinity of the head of the embodiment shown in FIG. 1 in detail. 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 diagrams 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 example of vertical stitching formed by the embodiment shown in FIG. 1, in which the number of stitch rows is reduced while maintaining the stitch row spacing when the width dimension of the darning is reduced. It is a diagram. 27: Needle swing setting device (operation unit), 38: Cloth presser device (vertical stitching length setting device), 52: Switch device (vertical stitching length setting device), 68: Darning controller (control means), 92: Address counter (specifying means) (generating means), 126: Count signal generator (generating means), 154: Darning data memory (generating means), 164: Latch circuit (generating means), 160: Arithmetic circuit (generating means), 162: Needle position increment setter (generating means), 154: Darning data memory (storage device).

Claims (1)

[Scope of Claims] 1. A sewing needle capable of vertical reciprocating motion and lateral rocking motion, and a feed dog capable of forward and backward feeding motion, and a row of forward feed stitches extending in both the forward and backward feeding directions of the feed dog; In a sewing machine capable of performing darning stitches in which rows of backward stitches are formed alternately at intervals in the swinging direction of the sewing needle, forward stitch information and backward stitch information for forming both stitch rows are provided. a storage device that stores eye information; and a darning 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. stitch length setting means; generating means for generating interval information regarding a predetermined row interval between both stitch rows in response to each of the position signals; and generating means responsive to the trailing edge position signal. designation means for specifying the forward feed stitch information in connection with the generation of interval information from the generating means and specifying the backward feed stitch information in connection with the generation of the interval information from the generating means responsive to the front end position signal; , an operation unit that can be operated to change the setting of the width of the darning in the swinging direction of the sewing needle; and a number of rows determined based on the set width of the darning and the predetermined row spacing. and a control means for operating the generating means and the specifying means while both of the stitch rows are formed, by forming each stitch row according to the spacing information and the specified stitch information. A sewing machine capable of darning, characterized in that it executes darning with the set width.