JPS6020026B2 - pattern sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pattern stitch sewing machine, and more particularly, to a pattern stitch sewing machine, and more particularly, to a pattern stitch sewing machine, and more particularly, to a pattern stitch sewing machine, a plurality of amplitude information and feeding devices are provided for controlling the lateral oscillating movement of a sewing needle in order to form various kinds of predetermined stitch patterns. The present invention relates to a pattern stitch sewing machine having an information generating device of a semiconductor memory device capable of generating a plurality of pieces of feed information for controlling the feed movement of the sewing machine.

Conventionally, in this type of pattern sewing machine, an operator first selects and operates a manual selection device to enable a group of amplitude information and feed information corresponding to a desired stitch pattern, and then operates the sewing machine. The information in the validated group of both information is sequentially generated in synchronization with the up and down reciprocating movement of the sewing needle, and the information is transmitted to each operating device operatively connected to the sewing needle and the feeding device. The operating device is operated according to the information, and each stitch is sequentially formed at a predetermined coordinate position on the work cloth, thereby forming a desired stitch pattern. In each seam forming cycle described above,
The time point at which amplitude information and feed information for forming a new stitch are supplied to the actuating device is determined in relation to the up and down reciprocating movement of the sewing needle. Typically, amplitude information is supplied to an actuator connected to the sewing needle at some point during the needle's journey from exiting the workpiece to the top point, and feed information is supplied to an actuator connected to the sewing needle at some point during the needle's journey through the workpiece cloth to the bottom point. At some point during the journey to reach an actuating device connected to the feed device. Therefore, if the manual selection device is operated to form a new stitch pattern after the amplitude information has been supplied to the actuating device, the first stitch formed by subsequent operation of the sewing machine will be The amplitude information does not correspond to the newly selected stitch pattern, but to the previously selected stitch pattern. Amplitude information corresponding to the stitch patterns created is sequentially supplied to the actuating device, and the lateral swing position of the sewing needle is determined in accordance with the amplitude information. This phenomenon is the same for the feed information, and after the feed information is supplied to the actuating device connected to the feed device, the manual selection device is operated to form another stitch pattern and the sewing machine is restarted. When operated, the feed information previously supplied to the actuating device is not replaced with that corresponding to the new stitch pattern, and the feed information corresponding to the previously selected stitch pattern is used after pattern selection. The first seam is formed. Therefore, an inappropriate seam is formed at the beginning of the formation of the selected seam pattern, which not only spoils the aesthetic appearance of the seam pattern, but also, for example, from the formation of a zigzag seam to the formation of a straight seam. When the manual selection device is operated to select a straight stitch, the position of the first stitch formed by subsequent operation of the sewing machine, that is, the first needle drop position in the horizontal direction of the sewing needle, and the subsequent straight line. Since the needle drop position in the lateral direction of the sewing needle for seam formation is different, it is easy for the operator to misjudge the position of the sewing line created by the straight seam.
There may be errors in forming straight stitches at the required sewing positions on the workpiece fabric, and the needle plate must be replaced or replaced so that the straight line general needle hole is located at the needle drop point when selecting the straight stitches. If the switch is made, problems such as the needle colliding with the throat plate and breakage will occur when the needle drops for the first time. As described, a mechanical clutch device is provided between the main shaft of the sewing machine and the needle bar.If the sewing machine is operated after the manual selection device is operated at the time mentioned above, the clutch device The first vertical reciprocating motion of the sewing needle is interrupted by disconnecting the main shaft and the needle bar to prevent the formation of the first stitch, or the method described in Japanese Patent Application Laid-Open No. 51-6835 As shown in Figure 2, a safety device is installed to prevent the needle bar from swinging when the straight needle plate is placed on the sewing machine bed. A device has been proposed in which the needle falls into the needle hole for straight lines at a fixed position.

However, such devices have the disadvantage of having a complex mechanical construction and being expensive. The present invention has been made in view of the above circumstances, and in particular, the determination of the lateral swing position of the sewing needle regarding the formation of the first stitch after the selection operation of a desired stitch pattern is performed based on the stitch pattern. This was done as a result of extensive research, focusing on the fact that the sewing machine has a large effect on the formation of the sewing machine and the safe use of the sewing machine. When a new stitch pattern is selected in the previously selected state and the sewing machine is operated thereafter, the lateral swing position of the sewing needle determined by the amplitude information corresponding to the previously selected stitch pattern is changed. The aim is to prevent as much as possible the formation of a new first stitch.

Another purpose is to select a new stitch pattern while the sewing machine is stopped and the sewing needle is located at a lower position where it has penetrated the workpiece cloth, and then the sewing machine is started. Preventing the feed movement by the feed device applied to the work cloth for forming the first stitch from being determined according to the feed information corresponding to the previously selected stitch pattern, and forming the newly selected stitch pattern. The purpose is to make the determination according to the feed information corresponding to the pattern. Yet another purpose is
The purpose of this invention is to eliminate the drawbacks of conventional sewing machines at a low cost and to the extent that they hardly cause any trouble in actual use of the sewing machine by adding and changing simple circuit configurations without using complicated mechanical configurations. . The following is a first embodiment of the present invention.
An embodiment will be described with reference to FIGS. 1 and 2.

That is, FIG. 1 is a diagram showing the overall configuration of an electrical control circuit that controls the lateral swing movement of the sewing needle and the feed movement of the work cloth in a pattern stitch sewing machine.
is a manual selection device that is operated by the worker, and includes, for example, three pattern selection switches S that correspond to six types of stitch patterns and are opened only while applying pressing force with fingers.
Consisting of 0 to S5, it is for selecting a group of amplitude information and feed information corresponding to 0 to a desired stitch pattern among the six types of stitch patterns mentioned above from among a large number of amplitude information and feed information described later. It is. The pattern selection switch SO corresponds to the straight line general rule, the pattern selection switch SI corresponds to the zigzag stitch, and the pattern selection switches S2 to S4 correspond to the triple stitch pattern, the half-stitch pattern, the blind stitch, and the German blind stitch, respectively. 'This is supported. One end of each of the pattern selection switches SO to S5 is connected to a low-level potential terminal (for example, a zero potential terminal), and each other end is connected to each 0 of the encoder 3 in the pattern selection pulse generator 2, which is a pattern selection pulse generator. connected to the input terminal. This encoder 3 assumes decimal numbers 0, 1, . . . 5 for the pattern selection switches S0, S1, . When one is closed, the decimal number assumed for this is converted into the pattern selection code in the binary code state, and each bit is outputted via the corresponding lines LI1, L12, and 114, respectively. At the same time, a trigger pulse is generated on a separately provided line L15 to trigger the monostable multipipelator 4.The pattern selection pulse generator 2 includes an encoder 3, a monostable multipipelator 4, and a latch 5.
The monostable multipipulator 4 is triggered by the trigger pulse from the encoder 3 and
The latch 5 is composed of 3 bits and receives as input from the encoder 3 via the corresponding bit lines LI1, L12, L14, and the clock input terminal CK is connected to the monostable multipipe. At the time when the pattern selection pulse from the encoder 4 is input through the line 16, the pattern selection code from the encoder 3 is stored, and at the same time, this pattern selection code is sent to the lines L21 and L2.
2, output via L24. 6 synchronizes a large number of amplitude information for controlling the horizontal oscillating movement of the sewing needle and a large number of feeding information that is paired with this amplitude information and controls the feeding movement of the work cloth in synchronization with the vertical reciprocating movement of the sewing needle. This is an information generating device for generating each information, and this will be described below.

That is, 7 is a semiconductor memory device, which stores amplitude information for determining the needle drop position and controlling the lateral swing movement of the sewing needle in order to form each of the six types of stitch patterns. The stored six types of amplitude information groups and feed information for determining the feed amount of the work cloth and controlling the feed movement to form each of the six types of stitch patterns were also stored in the order of stitch formation. This is to obtain six types of sending information groups. The semiconductor memory device 7 is connected so that the count contents of the address counter 8 are supplied as an address code, and the address code 'thus reads the pair of amplitude information and sending information stored at the designated address. They are output via line groups LA and LB, respectively. 9 is an address memory connected to receive the pattern selection code output from the latch 5 in the pattern selection pulse generator 2 as input via lines L21, L22, and L24; An address code (hereinafter referred to as a female terminal code) in the semiconductor storage device in which a pair of amplitude information for the 0th stitch and feed information for the 0th stitch necessary for forming the 0th stitch is stored for each stitch pattern. When a pattern selection code is input, a start end code corresponding to the pattern selection code is output to the address counter 8,
The configuration is such that when the address counter 8 is in the reset state, the counted contents are made to match the corresponding terminal code.

A multi-input AND circuit is connected to receive the outputs from the i-line group LA separately as inputs, and its output terminal is connected to one input terminal of the OR circuit li. The other input terminal of the OR circuit 11 is connected to receive the pattern selection pulse from the monostable multipipelator 4, and its output terminal is connected to the reset terminal RT of the address counter 8. Incidentally, in the six types of amplitude information groups stored in the semiconductor memory device 7, a termination code "11111" is stored at the address next to the address where each final information is stored, so that the selected amplitude When one stitch corresponding to the information group has been formed and a termination code is output via the line group LA, this is applied to the reset terminal RT of the address counter 8 via the AND circuit 10 and the OR circuit 11. The address counter 8 is reset each time one stitch pattern is formed. Then, the count contents of the reset address counter 8 are immediately made coincident with the female terminal code of the selected amplitude information by the address memory 9. 12 is a first pulse generator that generates timing pulses in synchronization with the vertical movement of the sewing needle. Specifically, as shown in Figure 2a and b, 13 shown by a straight line is the sewing machine bed. When 14 shown as a plane and a curved line is the vertical motion locus of the sewing needle tip,
Timing T3 when the sewing needles are displaced from the needle upper layer above the sewing machine bed surface 13 to the needle lower layer below the sewing machine bed surface 13
A timing pulse SP is generated that rises at timing T4 after a predetermined time and falls at timing TI, which is a predetermined time after timing TO when the sewing needle is displaced from the needle lower calendar to the needle upper pupil.

Reference numerals 15 and 16 each designate a monostable multipipulator configured to be triggered at the falling edge of a trigger input pulse, and each receives a timing pulse SP from the pulse generator 12 as a trigger input directly or via an inverter 7. a timing pulse generator 1 which is connected to the pulse generator 12 and which is a second pulse generator;
8.

Therefore, the timing pulse generator 18 as a whole has a timing T when the sewing needle moves below the sewing machine bed surface blade 3.
4, the rising edge of the timing pulse SP is inverted by the inverter 17 and applied to the monostable multivibrator 6, so that the feed timing pulse FCP is generated from the monostable multivibrator 6 in synchronization with the rising edge of the timing pulse SP. At timing TI when the sewing needle moves above the sewing machine bed surface 13, an amplitude timing pulse BCP is sent from the monostable multivibrator 15 in synchronization with the falling edge of the timing pulse SP.
is output. (See Figure 2 c, d). The clock input terminal CK of the address counter 8 in the information generating device 6 is connected so that the timing pulse SP from the pulse generator 12 is input via an inverter 42, and the address counter 8 When the signal from the inverter 42 falls, "In other words, the timing pulse SP
The count progresses in synchronization with the rising edge of T4 (timing T4). Reference numeral 114 denotes a needle position detection device consisting of a needle top detector 19 and a needle bottom detector 20, and the needle top detector 19 detects the timing T when the sewing needle is displaced from the needle lower pupil to the needle upper layer.
Timing T that rises immediately after O and is a predetermined time before timing T3 when the sewing needle is displaced from the needle upper layer to the needle lower layer
This configuration generates a needle up signal NUP that falls at a time of 2 (see FIG. 2 f).

Further, the needle lower detector 20 generates a timing pulse T which rises immediately after the timing T3 when the sewing needle is directly displaced from the needle upper layer to the needle lower layer, and when the sewing needle is displaced from the needle lower layer to the needle upper layer.
Needle lower signal N falling at timing T5, a predetermined time before O
This is a configuration that generates DP (see Figure 2g). and,
The output terminal of the needle-up detector 19 is connected to one input terminal of an AND circuit 21, which forms part of an amplitude synchronization means 23, which will be described later, and whose other input terminal is connected to the output side of the monostable multipipulator 4. The output terminal of the needle down detector 20 is connected to a feed synchronizing means 27 (to be described later), the other input terminal of which is connected to the output side of the monostable multipipulator 4.
It is connected to one input terminal of an AND circuit 22 forming a part of the circuit. Reference numeral 23 denotes amplitude synchronization means, which synchronizes the band circuit 21 with a latch 24 connected to receive amplitude information outputted from the semiconductor storage device 7 via the line group LA, and the monostable multi-noise circuit. An OR circuit 25 is connected so that the amplitude timing pulse BCP from the waveguide 15 and the output from the AND circuit 21 are input to different input terminals, and the output from the OR circuit 25 is delayed by a predetermined time. and a delay circuit 26 connected to apply a clock signal to the clock input terminal CK of the latch 24.

27 is a sending synchronization means, which is connected to the AND circuit 22;
A latch 28 connected to receive as input the sending information outputted from the semiconductor storage device 7 via the line group LB, a sending timing pulse FCP from the monostable multipipe layer 16, and a sending timing pulse FCP from the AND circuit 22. An OR circuit 29 is connected so that its output is input to a very different input terminal, and the output from this OR circuit 29 is connected so as to be delayed by a predetermined time and applied to the clock input terminal CK of the latch 28. and a delay circuit 30.

When the output from the delay circuit 26 is supplied as a latch signal to its clock input terminal CK, the latch 24 stores and holds the amplitude information from the semiconductor memory device 7, and simultaneously transfers the stored contents via the line group LC. Output. The latch 28 also connects the delay circuit 3 to its clock input terminal CK.
At the time when the output from 0 is supplied as a latch signal, the sending information from the semiconductor memory device 7 is stored and held, and at the same time, the stored contents are outputted via the line group LD. 31 and 32 transmit amplitude information stored in the latch 24 and feed information stored in the latch 28 to line groups LC and L, respectively.
D-A connected 03 to receive as input via D
A converter (digital-to-analog converter), each of which converts the amplitude information and sending information received as input into an analog signal of an amount corresponding to the code content, such as a DC voltage EI or E3, and outputs it. be.

Reference numeral 33 denotes an actuating device (its mechanical configuration is not shown) which is operatively connected to the feeding device for imparting feeding motion to the sewing needle and the work cloth, and will be described below.

That is, 34 and 35 are comparators for comparing analog quantities, and the DC voltage EI or E3 is applied to the positive input terminals of the DA converters 31 and 32, respectively. The comparator 34 receives a feedback voltage E2 from a potentiometer 36, which will be described later, at its negative input terminal.
is now given. Then, the comparator 3
4 compares the applied DC voltage EI with the feedback voltage B2, amplifies the surface voltage by an amplitude control driver 37, and supplies the amplified voltage to an amplitude control actuator 38. This amplitude control actuator 38 is a DC type reversible IJ.
This corresponds to a near motor, and is configured to control the movement of the sewing needle drop position in accordance with the supplied differential voltage. Further, the potentiometer 36 is an amplitude control actuator 3.
8, the actual position of the sewing needle is detected and converted into a feedback voltage E2, which is applied to the negative input terminal of the comparator 34 as described above. On the other hand, the comparator 35 has its negative input terminal supplied with a feedback voltage E4 from a potentiometer 39, which will be described later. and,
The comparator 35 receives the applied DC voltage E3 and the feedback voltage E.
4 and the difference voltage is amplified by the feed control driver 40 and supplied to the feed control actuator 41. The feed control actuator 41 corresponds to a direct current type reversible linear motor, and is configured to control the movement of feed teeth for feeding the work cloth in accordance with the supplied differential voltage. Further, the potentiometer 39 detects the actual position of the feed device including the feed dog operated by the feed control actuator 41 and converts it into a feedback voltage E4, which is connected to the negative input terminal of the comparator 35 as described above. It is given to Next, the operation of the above configuration will be explained. For example, suppose that the pattern selection switch SI is closed to form a zig-sag stitch. In this case, the count contents of the address counter 8 are gradually incremented at each rise of the timing pulse SP output from the pulse generator 12 in synchronization with the vertical movement of the sewing needle, and are stored in the semiconductor storage device 7. A group of amplitude information and a group of feed information necessary for forming a zig-sag stitch are sequentially addressed by the count contents of the address counter 8 and output to line groups LA and LB. In the amplitude synchronizing means 23, the amplitude timing pulse BCP outputted from the monostable multivibrator 5 in synchronization with the falling edge of the timing pulse SP is latched to the clock input terminal CK of the latch 24 via the delay circuit 26. Input as a signal, latch 2
4 is a timing T6 after a predetermined time determined by the delay circuit 26 from the generation of the amplitude timing pulse BCP.
(See FIG. 2c) At the same time, the amplitude information from the semiconductor memory device 7 is newly read and stored via the line group LB, and at the same time, the amplitude information as the stored content is transferred to the D-A converter via the line group LC. It is output to 31. Therefore, the D-A converter 31 receives the new amplitude information at its timing T6 mirror and generates a characteristic DC voltage EI based on the code content, which is applied to the positive input terminal of the comparator 34 in the actuating device 33. give to On the other hand, within the feed synchronization means, the feed timing pulse FCP outputted from the monostable multivibrator 16 in synchronization with the rise of the timing pulse SP is sent via the delay circuit 26 to the clock input terminal CK of the latch 28 as a latch signal. input and latch 2
8 is a timing T7 after a predetermined time determined by the delay circuit 30 from the generation of the feed timing pulse FCP.
(See Figure 2 d) At the same time, the sending information from the semiconductor storage device 7 is newly read and stored via the line group LB, and at the same time, the sending information in the memory is converted to D-A via the line group LD. It is output to the device 32. Therefore, the D-A converter 32 receives the new sending information at the timing T7 and generates a DC voltage E3 of a specific value based on the code content.
is generated and applied to the brass input terminal of comparator 35 in actuator 33. In this way, the operating device 33 changes the dropping position of the sewing needle to the semiconductor memory device 7 at every timing T6.
At the same time, the workpiece cloth is fed and moved by an amount corresponding to the feed information newly read from the semiconductor storage device 7 at every timing T7, This results in the formation of a zigzag seam. In this case, the above-mentioned movement of the sewing needle is performed in the needle upper layer where the amplitude timing pulse BCP is output, and the feed movement of the workpiece cloth is carried out by the feed timing pulse F.
This is done in the needle upper layer next to the needle lower layer where the CP is output. In addition, during the above-mentioned zigzag seam formation,
Although not shown, a needle hole switching device, which is operated in synchronization with the closing of the pattern selection switch SI, positions a needle hole for zigzag sewing in the form of a horizontally long circular hole at the point where the needle drops. Next, the operation will be described when the above-mentioned zigzag stitch formation is stopped, the pattern selection switch SO is newly closed, a straight stitch is selected, and the sewing machine is then started operating.

First, for example, if the sewing machine is stopped between timing TI and timing T2 when the sewing needle is located in the upper layer of the needle, and a new pattern selection switch SO is closed to select a straight stitch, this The decimal number (0) assumed to be converted into a binary code by the Eso coder 3 is stored in the latch 5 as a pattern selection code corresponding to a straight seam, and the pattern selection code is sent to an address via lines L21, L22, and L24. At the same time as being output to the memory 9, the monostable multipipelator 4 generates a pattern selection pulse. Then, the address counter 8 is reset by the pattern selection pulse, and at the same time, the address memory 9 receives the pattern selection code and converts the count contents of the address counter 8 into 1 necessary for forming the first straight stitch. The address code in the semiconductor memory device 7 in which the 0th amplitude information and the 0th sending information of the pair are stored is made to match the start end code. Therefore, in the semiconductor storage device 7, an address corresponding to the start end code of the straight stitch is specified by the count contents of the address counter 8, and is necessary for forming the first stitch of the straight stitch stored at that address. a pair of 0s
The stitch amplitude information and the 0th stitch feed information are each in line group L.
It is output via A and LB. Timing TO again
At T2, since the needle-up signal NUP is generated from the needle-up detector 19, the input terminals of the AND circuit 21 receive signals from the monostable multi-pipelator 4 at the time when the pattern selection switch SO mentioned above is closed. The pattern selection pulse and the needle up signal NUP are applied simultaneously to the AND circuit 2.
A signal pulse is output from the output terminal of latch 2, and this signal pulse is passed through OR circuit 25 and delay circuit 26 to latch 2.
The signal is input to the clock input terminal CK of No. 4 as a latch signal. Then, in synchronization with the closing of the pattern selection switch SO, the latch 24 reads the amplitude information of the 0th straight stitch from the semiconductor storage device 7 via the line group LA and stores it. The amplitude information of line group L
It is output to the DA converter 31 via C. Then, the D-A converter 31 receiving this amplitude information as input generates a specific DC voltage EI based on the code content and applies it to the plus input terminal of the comparator 34. This comparator 34
compares this DC voltage EI with the feedback voltage E2 from the potentiometer 36, and applies the difference voltage to the amplitude control driver 3.
7 and supplies it to the amplitude control actuator 381. As a result, the sewing needle is controlled to move to the drop position according to the amplitude information of the 0th stitch in the needle upper layer state at the timing T6. On the other hand, the pattern selection switch SO
At the time of closing, the needle down signal N from the needle down detector 20
DP is not present and therefore latch 2 in the feed synchronization means 27
8' Since no latch signal is applied, the latch 28 cannot store and hold the feed information of the 0th straight stitch read from the semiconductor memory device 7. Therefore, the latch 28' stores the feed information corresponding to the zigzag stitch before the pattern selection switch SO was opened, and this is stored in the latch 28'.
Since it is output to the A converter 32, the feed amount of the work cloth in the first stitch formation corresponds to the one zigzag stitch that was selected earlier, but this poses a practical problem. Don't come. In this way, the sewing needle pierces the work cloth at timing T3 after the straight stitch selection operation and is pulled out from the work cloth at the subsequent timing TO', thereby forming the first stitch. . The amplitude information for forming the second seam of such a straight stitch is the same as that for forming the first stitch, and the address next to the address where the amplitude information for the 0th stitch is stored is the terminal information. Since the code "11111" is stored, when the timing pulse SP rises at timing T4 when the sewing needle is moved directly below the needle during the formation of the first stitch, the count contents of the address counter 8 are changed accordingly. Progressing by one, the termination code "11111" in the semiconductor memory device 7 is addressed. Then, the address counter 8 is reset by this end code, and at the same time, the counted contents are matched by the address memory 9 with the start end code W of the straight stitch, so that the amplitude information and feed information of the 0th stitch are again stored in the address. They are designated and output to line groups LA and LB, respectively. At the same time, the feed timing pulse FCP output from the monostable multivibrator 16 in synchronization with the rising edge of the timing pulse SP is delayed by the delay circuit 301 and applied as a latch signal to the clock input terminal CK' of the latch 28 at timing T7. Therefore, the latch 28 uses the feed information of the 0th stitch of the straight stitch outputted from the semiconductor storage device 7 as the second
At the same time, it is stored as information for forming the th stitch and outputted to the actuating device 33 via the DA converter 32. Then, when the timing pulse SP falls at timing TI when the first stitch formation described above is completed and the sewing needle is moved to the upper needle position, the monostable multivibrator 5 outputs the signal in synchronization with this. Since the amplitude timing pulse BCP is delayed by the delay circuit 26 and applied to the clock input terminal CK of the latch 24, the latch 24 receives the amplitude information of the 0th stitch from the semiconductor memory device 7 described above for forming the second stitch. At the same time, this is stored as information for
Output to. Then, the actuating device 33 controls the movement of the sewing needle to a position corresponding to the amplitude information of the 0th stitch in the state of the upper pupil of the needle at timing T6 after the output of the amplitude timing pulse BCP. In addition, since the feed information for the 0th stitch described above has already been supplied to the actuating device 33 via the D-A converter 32 in the needle lower layer at timing T7, the work cloth feed period shown as FD in FIG. Then, a feed amount corresponding to the feed information of the 0th stitch is given to the work cloth. In this way, the second stitch is formed, and thereafter, third, fourth, . . . , other linear stitches are formed by the same action as described above. In the above case, when the pattern selection switch SO is closed at timings TO to TI and a straight stitch is selected, the amplitude timing pulse B is generated in addition to the generation of the pattern selection pulse from the monostable multipipulator 4.
The latch signal is given to the latch 24 in synchronization with the occurrence of CP (timing TI), but at this time the latch 24
Since the amplitude information of the 0th stitch will be read again, there will be no problem. Furthermore, when the pattern selection switch SO is closed in the needle upper layer at timings T2 to T3 to select a straight stitch, the needle up signal NUP from the needle up detector 19 is
does not exist, and the latch 24 cannot read the amplitude information of the 0th stitch of the straight stitch in synchronization with the generation of the pattern selection pulse. Therefore, the latch 24 stores amplitude information corresponding to the zigzag stitch before the pattern selection switch SO is closed, and the needle drop position when forming the first straight stitch corresponds to the zigzag stitch. However, the needle hole switching device (not shown) is a pattern selection switch S.
It takes a certain amount of time for the switching operation to position the small circular hole-shaped straight sewing needle hole at the needle drop point in synchronization with the closing of the O.
When the pattern selection switch is closed at the needle upper position at timings T2 to T3 and at the needle lower layer at timings T3 to T5, it is configured not to operate in synchronization with this, and zigzag stitching is performed at the needle drop position. Since the sewing needle hole remains in the position and then switches to the straight sewing needle hole when the sewing needle exits the needle upper position, there is no risk of the sewing needle colliding with the throat plate. For example, if the sewing machine is stopped between timing T4 and timing T5 in the lower needle adjustment, and the pattern selection switch SO is newly closed to select a straight stitch, the pattern selection switch In response to the closure of SO, a pair of 0th stitch amplitude information and 0th stitch feed information necessary for forming the first straight stitch are output from the semiconductor storage device 7 to line groups LA and LB, respectively. be done.

At this time, at timings T3 to T5, the needle lower detector 2
Since the needle down signal NDP is generated from 0, the above-mentioned pattern selection switch SO is applied to each input terminal of the band circuit 22.
At the time of closing, the pattern selection pulse from the monostable multipipulator 4 and the needle lowering signal NDP are simultaneously applied, and a signal pulse is output from the output terminal of the AND circuit 22, and this signal pulse is input to the clock input of the latch 28. It is input to terminal CK as a latch signal. As a result, the latch 28 reads and stores the feed information of the 0th stitch of the straight stitch from the semiconductor storage device 7 via the line group LB in synchronization with the closing of the pattern selection switch SO, and at the same time, the latch 28 reads the feed information of the 0th stitch of the straight stitch from the semiconductor storage device 7 via the line group LB and stores it. The stitch feed information is sent to D-A via line group LD.
Output to converter 32. Then, this D-A converter 32
The actuating device 33 receives the output from the sewing machine and applies a feed amount corresponding to the feed information of the 0th stitch to the workpiece cloth at the time when the sewing needle passes through the needle upper layer (see FIG. 2e). On the other hand, when the timing pulse SP falls at the timing TI when the sewing needle exits to the needle upper layer after the straight stitch selection operation, the amplitude timing pulse BCP output from the monostable multipipelator 15 is delayed in synchronization with this. Since the latch 24 is delayed by the circuit 26 and applied to the clock input terminal CK of the latch 24, the latch 24 receives the 0 from the semiconductor memory device 7.
At the same time as storing the amplitude information of stitches, this information is outputted to the actuating device 33 via the DA converter 31. Then, this actuating device 33 controls the movement of the sewing needle to a position corresponding to the amplitude information of the 0th stitch in the needle upper layer state at timing T6. In this way, in the needle upper layer after the straight stitch selection operation, a feed amount is given to the work cloth according to the feed information of the 0th stitch, and the sewing needle is controlled to move to a position according to the amplitude information of the 0th stitch. After that, the sewing needle pierces the work cloth at timing T3 and is pulled out from the work cloth at timing TO, thereby forming the first stitch. When the timing pulse SP rises at timing T4 during the formation of the first stitch, the count of the address counter 8 advances by one, and the termination code "11111" in the semiconductor memory device 7 is generated.
is addressed. Then, in the same manner as described above, the latch 28 stores the feed information for the 0th stitch in synchronization with the rising edge of the timing pulse SP, and at the same time stores this information in D-A.
It is output to the actuating device 33 via the converter 32, and the latch 24 is set to 0 in synchronization with the falling edge of the timing pulse SP.
The stitch amplitude information is transmitted to the actuating device 3 via the D-A converter 31.
3, and the second and subsequent stitches are thereby formed. Note that when the pattern selection switch SO is closed at timing T5 to TO in the lower needle pupil to switch from a zigzag stitch to a straight stitch, the needle bottom signal NDP from the needle bottom detector 20 does not exist. The latch 28 cannot read the feed information for the 0th stitch of a straight stitch. Therefore, the feed information corresponding to the zigzag stitch before the pattern selection switch SO is closed is stored in the latch 28, and the feed amount of the workpiece cloth in the first stitch formation corresponds to the zigzag stitch. However, the latch 24 is
Since the amplitude information of the 0th stitch of the straight stitch is stored in synchronization with the fall of the timing pulse SP at I, the needle drop position when forming the first stitch corresponds to the straight stitch. Therefore, practical problems such as the sewing needle colliding with the throat plate do not occur. Further, when the pattern selection switch SO is closed at timings T3 to T4 in the needle lower shift, the counting pot number of the address counter 8 advances due to the rise of the timing pulse SP at timing T4 immediately after that. Unlike straight stitches, in a stitch pattern consisting of multiple consecutive stitches as one unit, for example, a cross stitch pattern formed by pressing the pattern selection switch S3, when the counting progresses as described above, In this case, the first stitch is formed using the amplitude information of the first stitch and the feed information of the first stitch that should be used to form the second stitch, but there is a risk of collision between the sewing needle and the throat plate. No phenomenon occurs and there is no problem in practical use. According to this embodiment having the above configuration, the manual selection device 1 is operated to stop forming a zigzag stitch and form a new straight stitch while the sewing needle is in the needle-up position. In this case, the amplitude information of the 0th stitch corresponding to the formation of the first straight stitch formed by the subsequent operation of the sewing machine is read from the semiconductor storage device 7 in response to the operation of the manual selection device 1. As a result, the first stitch after the pattern selection operation is formed with the horizontal oscillation movement of the sewing needle that was determined by the amplitude information corresponding to the previously selected zigzag stitch. can be prevented. Therefore, even if the straight line general needle hole is located at the needle drop point when a straight stitch is selected, there is no possibility of the sewing needle colliding with the throat plate and breaking when the needle drops for the first time. In addition, if the manual selection device 1 is operated to stop forming a zigzag stitch and form a new straight stitch while the sewing needle is located directly below the needle, then Feed information for the 0th stitch corresponding to the formation of the first straight stitch to be formed can be read out from the semiconductor storage device 7 in response to the operation of the manual selection device 1, It is possible to prevent the first stitch from being formed after the straight stitch selection operation by the feed amount determined by the feed information corresponding to the zigzag stitch. Note that the functions and effects entrusted are the same when the pattern selection operation is performed between the seam patterns of the pond type, and the explanation thereof will be omitted.

Now, FIG. 3 is a diagram showing the overall configuration of the electrical control circuit in the second embodiment embodying the present invention, and hereinafter, the explanation of the same parts as in the first embodiment will be simplified. I will explain.

That is, 43 is the manual selection device 1 in the first embodiment.
A manual selection device with the same configuration as the pattern selection switch S
One end of O to S5 is connected to a low level potential terminal, and the other end is connected to each input terminal of an encoder 45 in a pattern selection pulse generator 44, which is a pattern selection pulse generator. The pattern selection pulse generator 44 has the same configuration as the pattern selection pulse generator 2 in the first embodiment,
It consists of an encoder 45, a latch 46 which receives the output of encoder 45 via lines L31, L32, and L34, and a monostable multipipulator 47 connected to output a latched signal to latch 46 when triggered by encoder 45. 48 is a decoder, and the output terminals D0, D1, . . . , D5 respectively receive decimal numbers 0, 1, .
. . 5 is assumed, each bit of the pattern selection code consisting of a binary code stored in the latch 46 is received as input via lines L41, L42, and L44, and is encoded in decimal. The output terminals D0, D1, . . . are assumed to have a decimal number that matches this decimal encoded number.
... A logic value 1 signal is output only to one output terminal of D5, and a 1 signal is output from the other output terminals.

In this way, the pattern selection pulse generator 44 operates when any one of the pattern selection switches SO to S5 is closed.
This is encoded in binary and stored in the latch 46 as a 3-bit pattern selection code, and when one of the pattern selection switches SO to S5 is closed, it corresponds to the newly closed one. The pattern selection code to be selected is re-stored in synchronization with the pattern selection pulse from the monostable multipipelator 47, and the currently stored pattern selection code is stored at the output terminals D0 and D1 of the decoder 48.
, . . . From D5, only one predetermined bit is output as a 1 signal and the other 5 bits are 0 signals as a 6-bit pattern code to be described later. A pulse generator 49 is a second pulse generator having the same configuration as the pulse generator 12 in the first embodiment, and outputs a timing pulse SP as an oscillator for controlling the lateral oscillating movement of the sewing needle. A feed control circuit that supplies an amplitude timing pulse BCP (see FIG. 4b) to the dynamic amplitude control circuit 50 (information generating device) and inverts the phase of the timing pulse SP by an inverter 51 to control the feed movement of the work cloth. 52 (information generating device) as a feed timing pulse FCP (see FIG. 4c).

In Fig. 4, 53 represents the vertical movement locus of the sewing needle tip when 54 shown by a straight line is the sewing machine bed surface, and FD indicates that the feed dog for feeding the work cloth protrudes upward from the sewing machine bed surface 53 and the work cloth is Indicates the period during which the fee will be given. Now, the details of the amplitude control circuit 50' will be described below. That is, 55 is connected to receive the amplitude timing pulse BCP from the pulse generator 49 as an input.
A stitch count counter having a bit structure counts the falling edge of the amplitude timing pulse BCP, and the count progresses sequentially. 56 is an oscillator 5 set to a relatively short oscillation period.
A search counter having a 6-bit configuration is connected to receive the oscillation output from the oscillation output from the oscillation output from the oscillation output 7 as an input, and its counting contents gradually advance at high speed in response to the oscillation output.

Reference numeral 58 denotes an amplitude control memory device made of a semiconductor, and as shown in the "Address" column in FIG.
It is composed of seven address groups (represented by a 3-bit code) as shown in the "Address group" column in Figure 5, in which these 32 addresses are one group, and a predetermined address in each address group is A 6-bit pattern code, which will be described later, is stored in 6 bits corresponding to 6 types of stitch patterns such as the straight stitch.

In FIG. 5, amplitude information of the 0th stitch corresponding to each stitch pattern is stored in the address group "000", and the code content of the blank space is "000000". The storage device 58 is provided to receive as input the count contents of the stitch count counter 55 and the count contents of the other 5 bits excluding the most significant bit of the search counter 56, respectively. One address group among the plurality of address groups is sequentially specified by the counting contents from the search counter 55, and 32 addresses in the specified address group are gradually advanced at high speed according to the total zero count contents of the search counter 56. The stored contents thus retrieved are sequentially output as read outputs from the output terminals DO to D5. Further, the most significant bit (the low-order bit) of the search counter 56 is connected to one input terminal of the OR circuit 59. The other input terminal of this OR circuit 59 is connected to the output side of the monostable multivibrator 47, and the output terminal of this OR circuit 59 is connected to the reset terminal RT of the stitch count counter 55. Therefore, the count contents of the search counter 56 progress and the fifth bit (
At the time when a carry is carried out from the highest bit to the most significant bit, or at the time when any one of the pattern selection switches SO to S5 is closed and the monostable multipipulator 47 generates a pattern selection pulse, the needle is turned off. The number counter 55 is reset. Reference numeral 60 denotes a comparison circuit as comparison means consisting of six AND circuits 61 to 66, and one input terminal of these six AND circuits 61 to 66 is connected to line L5.
0, L51, ..., L55 from the output terminals DO to D5 of the storage device 58, and the other input terminal receives the output terminals of the decoder 48 via lines L60, L61, ..., L65, respectively It is connected to receive the outputs from DO to D5, and therefore stores the stored contents consisting of a 6-bit code read from the storage device 58 and the corresponding 6-bit pattern code output from the decoder 48. If the bits match each other in any one of the AND circuits 61 to 66 and both inputs become 1 signal for each pair of bits, the AND circuit outputs 1 signal as a match signal.

67 is a multi-input OR circuit connected to receive the output from the comparison circuit 60 as an input, and 68 is the comparison circuit 60.
This is a monostable multipipelator which is a first pulse generator that is triggered by receiving one signal (coincidence signal) from the multi-input OR circuit 67 as an input, and thereby generates a timing pulse for information generation.

Reference numeral 69 denotes a 5-bit latch connected to receive the count contents of the search counter 56 as an input, and the pulse from the monostable multipipulator 68 is inputted to the clock input terminal CK' via the line L66. At the point in time, the count contents of the search counter 56 are stored and held as amplitude information consisting of a 5-bit code.

Further, the reset terminal RT of the search counter 56 connects the output from the monostable multipipe layer 68 to the delay circuit 70.
Connected to receive via. 71 is the first
This needle-up detector has the same configuration as the needle-up detector 19 in the embodiment, and the other input terminal receives the needle-up signal NUP (see FIG. It is connected so as to be supplied to one input terminal of an AND circuit 73 connected to the side via a delay circuit 72.

74 is an OR circuit, one input terminal of which is connected to receive the amplitude timing pulse BCP from the pulse generator 49 via a monostable multipipulator 75 and a delay circuit 76, and the other input terminal is It is connected to the output terminal of the asode circuit 73.

The output terminal of this OR circuit 74 is connected to the clock input terminal CK of a latch 77 connected to receive the stored contents of the latch 69 in the swing amplitude control circuit 50 as an input.
It is connected to the. The amplitude synchronization means 112 also uses the AND circuit 73, the OR circuit 74, and the latch 77 described above.
It consists of When the output from the OR circuit 74 is supplied as a latch signal to its clock input terminal CK, the latch 77 stores the amplitude information stored in the latch 69, and at the same time stores the amplitude information stored in the memory D-
Output to A converter 78. The DA converter 78 is configured to convert the widening information received as input into an analog signal, for example, a DC voltage BI, of an amount corresponding to the code content, and output the converted signal. 79 is the actuating device 33 in the first embodiment.
The actuating device has the same configuration as the one shown in FIG. driver 85
, feed control actuator 86 and potentiometer 8
7, and the positive input terminal of the comparator 80 has a D-A terminal.
A DC voltage EI from a converter 78 is provided.

Next, the feed control circuit 52 will be described below. Since the circuit configuration of the feed control circuit 52 is the same as the amplitude control circuit 50 described above, a brief explanation will be provided. Reference numeral 88 denotes a stitch count counter having the same configuration as the stitch count counter 55 connected to input and receive the feed timing pulse FCP from the pulse generator 19 via the inverter 51; The downlink (see FIG. 4) is counted and the counting progresses sequentially.

Reference numeral 89 indicates a data search counter having the same configuration as the search counter 56 and is connected to receive the oscillation output from the oscillator 57 as an input, and 90 indicates the count contents of the stitch number counter 88 and the search counter 89. This storage device 900 is a feeding control storage device having the same configuration as the storage device 58, which is provided to receive as input the counting contents of the other 5 bits excluding the most significant bit. As shown in Figure 6.

In FIG. 6, the address group "000" stores the feed information of the 0th stitch corresponding to each stitch pattern, and the code content of the blank column is "000000". 91 is an OR circuit, one output terminal of which is connected to the most significant bit of the search counter 89, the other input terminal of which is connected to the output side of the monostable multipipulator 47; It is connected to the reset terminal RT of the stitch count counter 88.

92 is a comparison circuit consisting of six AND circuits 93 to 98, and one input terminal of these six AND circuits 93 to 98 is connected to lines L70, L71, . . . , L, respectively.
75 to receive outputs from the output terminals DO to D5 of the storage device 90, and the other input terminal is connected to the line L, respectively.
60, L61, . . . , 1'65, and are connected to receive outputs from the output terminals DO to D5 of the five decoders 48.

99 is a multi-input OR circuit connected to receive the output from the comparison circuit 92 as an input;
The first pulse generation bag layer is a monostable multipipelator which receives as an input via 9 and is triggered, thereby generating timing pulses for information generation.

Reference numeral 101 designates a latch having the same configuration as the latch 69 connected to receive the count contents of the search counter 89 as an input, and a pulse from the monostable multipipulator 100 is connected to its clock input terminal CK via the line L76. At the time when the search counter 89 is input, the count contents of the search counter 89 are stored and held as sending information consisting of a 5-bit code.

Further, the reset terminal RT of the search counter 89 connects the output from the monostable multipipulator 100 to the delay circuit 1.
02. Reference numeral 103 designates a needle down detector having the same configuration as the needle down detector 20 in the first embodiment, and the other input terminal receives the needle down signal NDP (see FIG. 4f) which is the output thereof. It is connected so as to be supplied to one input terminal of an AND circuit 105 connected to the output side of the piperator 47 via a delay circuit 104.

Note that this needle down detector 103 and the needle up detector 71 together constitute a needle position detecting device 115. 106 is an OR circuit, one input terminal of which is connected to the pulse generator 49.
It is connected to receive the feed timing pulse FCP outputted from the inverter 51 via the monostable multipipulator 107 and the delay circuit 108, and the other input terminal is connected to the output terminal of the AND circuit 105. There is.

The output terminal of this OR circuit 106 is connected to the clock input terminal CK of a latch 109, which is connected to input the stored contents of the latch 101 of the feed control circuit 52.
'This is connected. And the above-mentioned AND circuit 105
, the OR circuit 106 and the latch 109 also constitute the sending synchronization means 113. When the output from the OR circuit 106 is supplied as a latch signal to its clock input terminal CK, the latch 109 stores the sending information stored in the latch 101 and at the same time transfers the sending information stored in the memory to D- A converter 11 outputs this signal. This D-A
The converter 110 is configured to convert the sending information received as input into an analog signal, for example, a DC voltage E3, in an amount corresponding to the code content, and output the converted signal.
The signal is supplied to the plus input terminal of the comparator 84 in the comparator 9. Further, 111 is an R-S flip-flop whose set input terminal S is connected to the output terminal of the AND circuit 105, and whose reset input terminal R is connected to the delay circuit 108 in order to receive the feed timing pulse FCP.
Further, the output terminal Q is connected to the input terminal of the OR circuit 59 in the swing amplitude control circuit 50 via the line BRT. Next, the operation of the second embodiment having the above configuration will be explained.

For example, assume that the pattern selection switch SI is closed to form a zigzag stitch. In this case, by closing the pattern selection switch SI, the assumed decimal number 1 is converted into a decimal code by the encoder 45 and the latch 4
6, and the stored contents are transferred from the latch 46 to the line L.
41, L42, and L44 to the decoder 48, where it is again converted to decimal 1, and this decoder 48's decimal 1
A logic value 1 signal is output from the output terminal DI where the output terminal DI is assumed to be, and a logic value 0 signal is output from the other output terminals D0, D2, D3, D4, and D5, and as a result, the output terminals DO to D
5 to lines L60 to L65, the code content “0100
A pattern code of ``00'' is output. On the other hand, the count contents of the stitch number counters 55 and 88 are gradually advanced at each falling edge of the amplitude timing pulse BCP and the feed timing pulse FCP inputted from the pulse generator 49, and are specified sequentially. Separately, the count contents of the search counters 56 and 89 are gradually increased at high speed in response to the oscillation output from the oscillator 57. The addresses are sequentially searched at high speed, and the storage contents at the addresses (see FIGS. 5 and 6) are retrieved from the storage devices 58 and 90 to the comparison circuits 60 and 92.
are output sequentially. By the way, the pattern code "010000" is input to the comparison circuits 60 and 92 via lines L60 to L65, and each comparison circuit 60 and 92 stores this pattern code "010000" and the storage devices 58 and 90. The storage contents outputted from the memory contents are compared with each other, and when they match, a match signal with a logical value of "1" is outputted.

The match signals output from the comparison circuits 60 and 92 trigger the monostable multi-byte counters 68 and 100, respectively, and their outputs are sent to the clock input terminals CK of the latches 69 and 101 and the reset terminals RT of the search counters 56 and 89. Therefore, the count contents of the search counters 56 and 89 at the time when the matching signals are outputted from the comparison circuits 60 and 92 are stored in the latches 69 and 101 as amplitude information and sending information, respectively, and the search Counters 56 and 89 are reset. In the amplitude synchronizing means 112, the falling edge of the amplitude timing pulse BCP generated from the pulse generator 49 is transmitted to the clock input terminal CK of the latch 77 as a latch signal via the monostable multipipulator 75, the delay circuit 76, etc. In synchronization with this, the latch 77 stores the amplitude information stored in the latch 69 and at the same time outputs the stored amplitude information to the DA converter 78. Therefore, the D-A converter 78 outputs the amplitude timing pulse B
At every timing T6 (see Fig. 4b) that is a predetermined time after the falling edge of CP (timing TI), new amplitude information is received, a DC voltage EI of a specific value based on the code content is generated, and this is activated. to the positive input terminal of comparator 80 within device 79. On the other hand, in the feed synchronization means 113, the falling edge of the feed timing pulse FCP outputted from the pulse generator 49 via the inverter 51 is applied to the clock input terminal CK of the latch 109 via the delay circuit 108 and the like.
When the latch signal is applied as a latch signal, in synchronization with this, the latch 109 stores the sending information stored in the latch 101 and at the same time outputs the sending information stored in the memory to the DA converter 11. Therefore, D-A converter 11,
At every timing T7 (see FIG. 4c) that is a predetermined time after the falling edge of the feed timing pulse FCP (timing T4), new sending information is received and a DC voltage E3 of a specific value is generated based on the code content. , this is the actuating device 7
9 to a comparator 84 in In this way, the actuating device 79 adjusts the dropping position of the sewing needle to the latch 7 at every timing T6.
The movement of the workpiece cloth is controlled to a position according to the amplitude information newly output from 7, and the workpiece cloth is moved to the latch 1 at every timing T7.
4th by the amount corresponding to the feed information newly output from 09
It is fed and moved during a period shown as FD in the figure, thereby forming a zigzag stitch. In this case, the above-mentioned movement of the sewing needle is performed at the position above the needle where the fall of the amplitude timing pulse BCP occurs, and the feed movement of the work cloth is performed at the position below the needle where the fall of the feed timing pulse FCP occurs. This is done at the next needle up position. Furthermore, during the above-mentioned zigzag stitch forming operation, a needle hole switching device (not shown) which is operated in synchronization with the closing of the pattern selection switch SI creates a zigzag stitch in the shape of a round hole at the drop point of the foam needle. The common needle hole is located. Next, a description will be given of the operation when the above-described zigzag stitch formation is stopped, a new pattern selection switch SO is opened, a straight stitch is selected, and the sewing machine is then operated.

First, for example, if sewing machine 0 is stopped and pattern selection switch SO is closed to select a straight stitch between timing TO and T2 when the sewing needle is located in the upper needle layer, this is assumed to be the case. The converted decimal number encoder 45 converts it into binary digits and stores it in the latch 46 as a pattern selection switch corresponding to 1 straight stitches, and the stored contents are transferred from the latch 4 to 6 to the lines L41, L42, L44. The signal is sent to the decoder 481 via the decoder 481, where it is again converted into a decimal number 0', and a logic value 1 signal is output from the output terminal DO of this decoder 48, which is assumed to be a decimal number 0, and the signal is sent to the other output terminal DI.
A logic value 0 signal is output from ~D5, and as a result, a pattern code of code content ``100000J'' is output from output terminals DO to D5 to lines L60 to 65.Meanwhile, the stitch count counters 55 and 88 output the pattern code from output terminals DO to D5 to lines L60 to 65. selection switch S
It is reset by the pulse from the monostable multipipelator 47 accompanying the closing of O, and the count content is "000". Therefore, in the oscillation amplitude control circuit 50, the code content of the output of the stitch count counter 55 is "000", and the address group "000" in the plurality of address groups of the storage device 58 is set as "000".
'' is specified, and in addition to this, the search counter 56 responds to the oscillation output from the oscillator 57 and its counting contents gradually advance at high speed, and the addresses within the address group "000" are sequentially searched at high speed, The stored contents of each address (see FIG. 5) are sequentially output from output terminals DO to D5 of the storage device 58 as a 6-bit code. Then, when the pattern code with the code content "101000" is read from the address "10000", the line L5 is output from the output terminals DO and D2 of the storage device 58.
A 1 signal is supplied to one input terminal of each of the AND circuits 61 and 63 through lines L60 and L52, while a code content "1000" is supplied from the decoder 48 to lines L60 to L65.
Based on the fact that the pattern code "00" is always output, the 1 signal is already supplied to the other input terminal of the AND circuit 61 via the input L60.
1 outputs one signal which is a coincidence signal. This match signal triggers the monostable multipipe layer 68 whose outputs are respectively input to the clock input terminal CK of the latch 69 and to the reset terminal RT of the search counter 56 via the delay circuit 70, so that the match signal The count content of the search counter 56 at the time when is output from the AND circuit 61 is 0, which is a code of ``10000'' and is stored in the latch 69 as the amplitude information for the 0th stitch, and the search counter 56 is reset. Furthermore, since the needle-up signal NUP is generated from the needle-up detector 71 at the timing TO to T2 when the pattern selection switch SO is opened (see FIG. 4e),
The pattern selection switch from the monostable multipipulator 47 and the needle up signal NUP are simultaneously applied to each input terminal of the AND circuit 73 in the amplitude synchronization means 112 at the time when the pattern selection switch SO is closed. 73
A signal pulse is output from the latch 77, and this signal pulse is input as a latch signal to the clock input terminal CK of the latch 77 via the OR circuit 74. Therefore, the latch 77 synchronizes the amplitude information "10000" of the 0th stitch of the straight stitch stored in the latch 69 with the closure of the pattern selection switch SO, that is, the pattern selection pulse from the monostable multipiper 47. At the same time, the memory contents are transferred to D-A.
Output to converter 78. Then, the DA converter 78 which receives this amplitude information as an input generates a DC voltage EI of a specific value based on the code content and applies it to the plus input terminal of the comparator 80. The comparator 80 compares the DC voltage EI with the feedback voltage E2 from the potentiometer 81, and the difference voltage is amplified by the amplitude control driver 82 and supplied to the amplitude control actuator 83. As a result, the sewing needle is controlled to move to a drop position corresponding to the amplitude information "10000" for the 0th stitch. On the other hand, in the feed control circuit 52, the address group "000" in the storage device 90 is designated by the count contents of the stitch count counter 88, and the address group "000" in the address group "000" is designated by the search counter 89. The address "1110" shown in Figure 6 is searched sequentially at high speed.
When the pattern code "100000" is read out from "1", the 1 signal is supplied to both input terminals of the AND circuit 93 in the comparator circuit 92, and the AND circuit 93 supplies the 1 signal as a match signal. This match signal triggers the monostable multivibrator QO, and therefore, the count content of the search counter 56 at the time when the match signal is output from the AND circuit 93, that is, the code "1110i" is the latch 1.
01 as the feed information for the 0th stitch, and the search counter 89 is reset. By the way, at the time when the pattern selection switch SO is closed, the needle down signal NDP from the needle down detector 103 does not exist, and no latch signal is applied to the latch 109 in the feed synchronizing means turtle 13, so the latch 109 is in a straight line. Feed information for 0th stitch of stitch “11101”
cannot be read from the latch 101. Therefore, since the latch 109 stores the feed information corresponding to the zigzag stitch before the pattern selection switch SO is closed, and this is output to the D-A converter 1101, the first stitch after the pattern selection operation is Although the feed amount of the work cloth during formation corresponds to the previously selected zigzag stitch, this does not pose a practical problem. In this manner, the sewing needle pierces the workpiece cloth at timing T3 and then pulls out from the workpiece cloth at timing TO, thereby forming a straight stitch. Then, when the feed timing pulse FCP falls at timing T4 during the formation of the first stitch, the count content of the stitch number counter 88 changes from "000" to "
001” and the address group “001” in the storage device 90.
is specified and "this address group rool" is searched by the search counter 89, but there is no code in the address group "001" with the most significant bit of 1 according to the pattern code corresponding to a straight stitch (the 6), therefore, the search counter 89 is
After searching up to ``11111'', the most significant bit is carried over and the count content is changed to ``100000''. Then, based on the fact that the most significant bit of the search counter 89 is input to the reset terminal RT of the stitch count counter 88 via the OR circuit 91, the stitch count counter 88 is reset and the address group "000" is reset. This address group continues to be ``000''.
will be searched by the search counter 89. Therefore, from now on, the storage device 9 is controlled by the feed timing pulse FCP.
The 0 address group "000" is repeatedly designated. Therefore, the address group "000" is searched by the search counter 89 and the pattern code "100000" is obtained from the address "11101".
” is read out, the search counter 8 is read out in the same manner as described above.
9, the code of count content "11101", that is, the feed information for the 0th stitch is stored in the latch 101 as feed information for forming the second stitch, and the search counter 89 is reset. At this time, the output of the monostable multipipulator 107 triggered by the fall of the feed timing pulse FCP is delayed for a predetermined time via the delay circuit 108, etc., and is applied to the clock input terminal CK of the latch 109 at timing T7. Therefore, the latch 109 is
The feed information "11101" for the 0th straight stitch stored in the latch 101 is stored, and at the same time, the stored contents are output to the actuating device 79 via the DA converter 110. Then, when the first stitch formation is completed and the sewing needle is moved to the needle-up position, the actuating device 79 intervenes in the D-A converter 110 and inputs the input 0th stitch feed information "1".
1101" to the work cloth (4th
(See FD in the figure). Further, when the amplitude timing pulse BCP falls at timing TI after forming the first straight stitch, the count of the stitch number counter 55 progresses from "000" to "001" and the address group in the storage device 58 is “001
” is specified, and this address group “001” is entered in the search counter 56.
However, in the address group "001" there is no pattern code that corresponds to a straight stitch and the most significant bit is 1 (see Figure 5), so the search counter 56 searches for the address "001".
After searching up to ``11111'', the most significant bit is carried over and the count content is changed to ``100000''. Then, based on the fact that the most significant bit of the search counter 56 is input to the reset terminal RT of the stitch count counter 55 via the OR circuit 59, the stitch count counter 55 is reset and the address group "000" is reset. This address group “00” is specified again and continues to be
0'' will be searched by the search counter 56. Therefore, from now on, the address group "000" of the storage device 58 is repeatedly designated by the amplitude timing pulse BCP. Therefore, the address group "000" is searched by the search counter 56 and the pattern code "1010" is searched from the address "10000".
When "00" is read out, the code of the count content "10000" of the search counter 89, that is, the amplitude information of the 0th stitch is stored in the latch 69 as the amplitude information for forming the second stitch. At the same time, the search counter 56 is set. At this time, the amplitude timing pulse BCP
The output of the monostable multipipulator 75, which is triggered by the falling edge of At the same time, the amplitude information "10000" of the 0th stitch of the straight stitch stored in the latch 69 is stored, and the stored content is
-A converter 78 to an actuating device 79. Then, the actuating device 79 controls the movement of the sewing needle in the needle upper layer where the fall of the amplitude timing pulse 8CP occurs to a position corresponding to the amplitude information "10000" of the 0th stitch. In this way, the second stitch is formed, and thereafter, the third, fourth, etc. straight stitches are sequentially formed by the same action as described above. In addition, timing T2-T3
When the pattern selection switch SO is closed to select a straight stitch in the needle upper layer shown by , the needle up signal NUP from the needle up detector 71 does not exist, and the latch 77 detects the amplitude of the 0th stitch of the straight stitch. Information cannot be read from latch 69. Therefore, the latch 77 stores amplitude information corresponding to the zigzag stitches before the opening of the pattern selection switch SO.
The needle drop position in the first stitch formation after the pattern selection operation corresponds to a zigzag stitch, but in this case, as explained in the first embodiment, the needle drop position does not have a zigzag stitch. Since the sewing needle hole remains in the position and then switches to the straight needle hole when the sewing needle comes out to the needle-up position, it is not recommended that the sewing needle collide with the throat plate. For example, if the sewing machine is stopped between timings T4 and T5 in the needle lower layer and the pattern selection switch SO is newly closed to select a straight stitch, the pattern selection switch SO is closed in the same manner as described above. In response to closing, the amplitude information of the 0th stitch "10000" and the feed information of the 0th stitch necessary for forming the first straight stitch "11101"
” are stored in latches 77 and 101, respectively.

At this time, at timings T3 to T5, the needle lower detector 1
Since the needle lowering signal NDP is generated from 03, the monostable multipipulator 47 is applied to each input terminal of the AND circuit 105 at the time when the pattern selection switch SO described above is closed.
The pattern selection pulse from and the needle lowering signal NDP are applied simultaneously, and a signal pulse is output from the output terminal of the AND circuit 105. This signal pulse causes latch 10
The clock input terminal CK of 9 and the set input terminal S of the R-S flip-flop 111 are inputted as a latch signal and a trigger signal, respectively. As a result, a signal pulse is transmitted from the output terminal Q of the R-S flip-flop 111 to the line BRT.
This signal pulse controls the amplitude control circuit 50.
The stitch count counter 55 inside the stitch counter 55 is reset, and at the same time
9 is the feed information for the 0th stitch from the latch 101 “illo
1" and the stored contents are transferred to the D-A converter 11.
Output to 0. Then, upon receiving the output from the DA converter 110, the actuating device 79 applies a feed amount corresponding to the feed information of the 0th stitch to the work cloth at the time when the sewing needle passes through the needle upper calendar. By the way, the R-S flip-flop 111 receives the output of the monostable multipipulator 107, which is triggered on the falling edge of the feed timing pulse FCP, through the delay circuit 108 and connects it to its reset input terminal R.
A signal pulse is continuously output from the output terminal Q until the signal is input to the output terminal Q. As a result, the stitch number counter 55 is in a reset state by the signal pulse from the R-S flip-flop 111 from when the stitch once passes through the upper needle layer until timing T7 when the stitch is transferred to the lower needle layer again. Therefore, even if the amplitude timing pulse BCP falls at the timing TI when the sewing needle exits to the needle upper layer after the pattern selection switch SO described above is closed, the count content of the stitch number counter 55 does not advance. The value remains "000", and the amplitude information of the 0th stitch of the straight stitch remains stored in the latch 69. In this way, the output of the monostable multi-pipelator 75 triggered at the falling edge of the amplitude timing pulse BCP is applied as a latch signal to the latch 77, which outputs the straight stitch stored in the latch 69. At the same time as memorizing the amplitude information of the 0th stitch,
This is outputted to the actuating device 79 via the DA converter 78. This actuating device 79 controls the movement of the sewing needle to a position corresponding to the amplitude information of the 0th stitch at the needle upper pupil where the fall of the amplitude timing pulse BCP occurs. In this way, at the needle upper pupil immediately after the pattern selection switch SO is closed, the work cloth is fed and moved at a feed amount that corresponds to the feed information of the 0th stitch, and the sewing needle is moved in accordance with the amplitude information of the 0th stitch. The first stitch is formed after the movement is controlled to the position. Further, the second and subsequent stitch forming operations are performed in the same manner as described above. Note that when the pattern selection operation is performed in the needle lower layer shown at timings T5 to TO, the needle lowering signal NDP from the needle lowering detector 103 does not exist.
Latch 109 receives feed information for the 0th stitch of the straight stitch.
Cannot read from 01. Therefore latch 109
The feed information corresponding to the zigzag stitch before the opening of the pattern selection switch SO is stored, and the feed amount of the work cloth in the first stitch formation will be the one corresponding to the zigzag stitch. , the latch 77 stores the amplitude information of the 0th straight stitch in synchronization with the fall of the amplitude timing pulse BCP at the subsequent timing TI.
The needle drop position in the first stitch formation corresponds to a straight stitch. Therefore, practical problems such as the sewing needle colliding with the throat plate do not occur. In addition, when the pattern selection switch SO is closed at timing T3 to T4 in the needle lower layer, the count content of the stitch number counter 88 changes from "000" to "000" due to the fall of the feed timing pulse FCP at timing T4 immediately after that. "001"
At the same time, the count content of the stitch number counter 55 changes from "000" to "00" at timing TI when the sewing needle exits from the needle lower layer to the needle upper layer at timing T4.
It progresses to 1. As described in the first embodiment, unlike straight stitches, a stitch pattern consisting of a plurality of consecutive stitches as one unit, for example, a pattern selection switch S
In the cross stitch pattern formed by the pressing operation in step 3, if the counting progresses as described above, the first stitch formation is the amplitude information of the first stitch that should be used to form the second stitch. 0010” and 1st stitch feed information “11101” (
(see Figures 5 and 6),
There is no problem in practical use because the sewing needle does not break due to collision with the throat plate. When the sewing needle is in the needle lower calendar (timing T3~TO) and timing T2~
A safety device that prevents the needle hole switching device from operating in synchronization with the pattern selection operation when the needle is in the upper layer at T3 becomes unnecessary by adding the needle up stop mechanism to this embodiment. When the operation of the sewing machine is stopped for selection, the needle up stop mechanism always stops the sewing needle at the upper layer of the needle at timings TI to T2 shown in FIG. 2a and FIG. The amplitude information of the 0th stitch of the newly selected stitch pattern can be used simply as the amplitude information for forming the first stitch.

As is clear from the above description, according to the present invention, when a new stitch pattern is selected in a state where the sewing needle is located in the upper needle layer and the sewing machine is stopped, and the sewing machine is then operated, It is possible to form the first stitch of a newly selected stitch pattern while maintaining the horizontal swing position of the sewing needle that was determined by the amplitude information corresponding to the previously selected stitch pattern. In addition, when a new stitch pattern is selected with the sewing machine stopped with the sewing needle positioned at the position below which the sewing needle has penetrated the workpiece cloth, and the sewing machine is then started, The feeding motion by the feeding device applied to the work cloth for forming the first stitch after pattern selection is
It is possible to prevent the seam pattern from being determined according to the feed information corresponding to the previously selected seam pattern and to make it determined according to the feed information corresponding to the newly selected seam pattern, making it even more complicated. By adding or changing a simple circuit configuration without using a mechanical configuration, the drawbacks of conventional sewing machines can be solved at a low cost and to the extent that there is almost no problem in actual use of the sewing machine. It is possible to provide a pattern sewing machine that exhibits the following effects.

[Brief explanation of the drawing]

1 and 2 relate to a first embodiment of the present invention, and FIG. 1 shows an electrical control circuit for controlling the horizontal swing movement of the sewing needle and the feed movement of the work cloth in the sewing machine. Bu. Fig. 2 is a time chart for explaining the operation of the embodiment, and Figs. 3 to 6 are time charts for explaining the operation of the embodiment.
3 and 4 respectively correspond to FIGS. 1 and 2 in the first embodiment, and FIGS. 5 and 6 show the storage contents of different storage devices, respectively. It is a diagram. In the figure, 1 and 43 are manual selection devices, 2 and 44 are pattern selection pulse generators (pattern selection pulse generators), and 6
is an information generator, 12 is a pulse generator (first pulse generator), BCP is an amplitude timing pulse, FCP is a feed timing pulse, 18 is a timing pulse generator (second pulse generator), 19 and 71 are Needle top detectors, 20 and 103 are needle bottom detectors, 23 and 112 are amplitude synchronization means, 27 and 113 are feed synchronization means, 33 and 7
9 is an actuating device, 49 is a pulse generator (second pulse generator), 50 is an oscillation amplitude control circuit (information generator), 5
2 is a feed control circuit (information generating device), 55 and 88 are stitch count counters, 56 and 89 are search counters, 57 is an oscillator,
58 and 90 are storage devices, 60 and 92 are comparison circuits, 6
8, 10 Kawama monostable multipipelator (first pulse generator), 69, 77, 101 and 109 are latches,
111 is an R-S flip-flop, and 114 and 115 are needle position detection devices. Figure 2 Figure Ship Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Scope of Claims] 1. A sewing needle of a sewing machine capable of vertical reciprocating motion and lateral rocking motion; a feeding device for imparting a feeding motion to a workpiece cloth in synchronization with the vertical reciprocating motion of the sewing needle; an actuating device operatively connected to the sewing needle and the feeding device for causing a lateral rocking movement of the sewing needle and a feeding movement of the feeding device, and for forming a predetermined variety of stitch patterns; an information generating device capable of generating a large number of amplitude information for controlling the lateral oscillating movement of the sewing needle and a large number of feeding information for controlling the feeding movement of the feeding device; a manual selection device operated by an operator to select one group of amplitude information and feed information corresponding to a desired stitch pattern from a large number of amplitude information and feed information, and a manual selection device operated by the manual selection device. A timing pulse for generating information, which determines when to generate each information in the selected group of amplitude information and feed information from the information generating device, in synchronization with the vertical reciprocating movement of the sewing needle. 1 pulse generator; a pattern selection pulse generator for generating pattern selection pulses in response to manual operation of the manual selection device; and a pattern selection pulse generator for generating pattern selection pulses in response to manual operation of the manual selection device; a second pulse generator for generating an amplitude timing pulse when the sewing needle reaches a predetermined position below the sewing machine bed surface, and generating a feed timing pulse when the sewing needle reaches a predetermined position below the sewing machine bed surface; a needle position detection device for generating a needle-up signal while the needle is located within a predetermined range; and a needle position detection device for storing and storing each amplitude information generated by the information generating device and supplying it to the actuating device. amplitude synchronization means for storing and holding each amplitude information from the information generating device in response to the pattern selection pulse or the amplitude timing pulse generated while the needle up signal is being generated; Feed synchronization means, which is provided to store and hold each piece of feed information generated from the information generator and supply it to the actuating device, and stores and holds each piece of feed information from the information generator in response to the feed timing pulse. A pattern sewing machine characterized by comprising: 2. A sewing needle of a sewing machine capable of vertical reciprocating motion and horizontal oscillating motion, a feeding device for imparting a feeding motion to a workpiece cloth in synchronization with the vertical reciprocating motion of the sewing needle, and a lateral oscillating motion of the sewing needle. an actuator operatively connected to the sewing needle and the feeder for causing movement and feeding movement of the feeder; and a lateral movement of said sewing needle for forming a predetermined variety of stitch patterns. An information generating device capable of generating a large number of amplitude information for controlling the oscillating motion and a large number of sending information for controlling the feeding movement of the feeding device, and a large number of amplitude information and information that can be generated by the information generating device. a manual selection device operated by an operator to select one group of amplitude information and feed information corresponding to a desired stitch pattern from among the feed information; a first pulse generator that generates a timing pulse for information generation that determines when each information in the amplitude information and the sending information is generated from the information generator; a pattern selection pulse generator for generating pattern selection pulses, and generating an amplitude timing pulse when the sewing needle reaches a predetermined position above the sewing machine bed surface; a second pulse generator for generating a feed timing pulse when the specified position is reached;
A needle up signal is generated while the sewing needle is located within a predetermined range above the sewing machine bed surface, and a needle up signal is generated while the sewing needle is located within a predetermined range below the sewing machine bed surface. a needle position detection device for generating a lower signal;
The pattern selection pulse or the amplitude timing pulse is provided to store and hold each amplitude information generated from the information generating device and supply it to the actuating device, and is generated while the needle up signal is being generated. amplitude synchronization means for storing and holding each amplitude information from the information generating device in response to;
The pattern selection pulse or the feed timing pulse is provided to store and hold each feed information generated from the information generating device and supply it to the actuating device, and is generated while the needle down signal is being generated. 1. A pattern sewing machine comprising: feed synchronization means for storing and holding each feed information from said information generating device in response to said information generating device.