JPS6022957B2 - Control device for 2-needle square stitch sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a two-needle corner stitch sewing machine, and is particularly applicable to two-needle stitches in which stitches are formed by two needles spaced apart from each other on the left and right, and corner stitches. The present invention relates to a control device for a two-needle corner sewing machine equipped with a needle comb mechanism that enables single-needle sewing in which one of the needles is stopped to form a stitch.

Conventionally, as an example of a control device for this type of two-needle corner stitch sewing machine, for example, when corner stitching is performed, the needle holder mechanism is switched from a double needle sewing state to a single needle sewing state by operating a manual switching lever, and at the same time, The sewing machine is driven at a low speed, and when the drive reaches a predetermined number of stitches, the sewing machine is stopped with the needle positioned at a downward position according to the output of the stitch number counter, and then the needle stopped at that downward position. After turning the cloth around , by depressing the foot pedal, sewing is continued in the single needle state, and when the sewing matches the predetermined number of stitches, an output is output from the counter again. A control device for a two-needle square stitch sewing machine is provided which allows switching from single-needle stitching to double-needle stitching.

However, "The control device of this two-needle corner stitch sewing machine does not take into consideration the case where multiple corners with different stitch conditions are sewn consecutively. Therefore, in such a case, when sewing corners, Each time, the manual switching lever and the needle counter setting device (for setting the number of single-needle sewing stitches at corners) must be operated, which is extremely complicated and reduces work efficiency. This caused fatigue, etc.

Therefore, in the present invention, in view of such circumstances, a plurality of selection means for arbitrarily selecting which of the left and right one-needle stitching states to be set for a plurality of consecutively formed corner stitched portions; By providing the same number of period setting means corresponding to the plurality of selection means to determine the sewing period in the state of regular needle sewing, it is possible to It is also designed so that it can be easily sewn continuously.

Examples embodying the present invention will be described below.
In the figure, reference numeral 1 denotes a table, on which a two-needle square stitch sewing machine 3 (hereinafter referred to as the sewing machine) having a sewing machine main shaft 2 is mounted.

The sewing machine 3 has two needles 4 arranged at intervals on the left and right, a two-needle warp that forms a vertical stitch, and one needle rests at a corner to form a stitch. Do 1
It is equipped with a needle combing mechanism that enables the main needle twill. The detailed structure of this needle mechanism is shown in Utility Model No. 50-12387 (Utility Model Application No. 51-85862, Needle Movement Control Device for Sewing Machine) filed by the present applicant. Since various other similar devices are known, detailed explanations will be omitted. The drawing shows the needles 4 and 5.
Only the needle twill 677 supporting the is shown. Reference numeral 8 designates one air cylinder for cutting fusuma, which is attached to the back surface of the sewing machine 3 via a mounting plate 9, and its piston rod 8a' is connected to the connecting body 10 in FIG. Lotus birch 12,
It is operatively connected to the needle mechanism via the swing lever 13, lotus birch 47, and the like.

Although not shown, an electromagnetic switching valve having two excitation coils (see diagram 6C) is connected to the air cylinder 8 for the sliding door. When pushed, the piston rod 8a
is moved to one side, the right needle is stopped and the left needle 4 is in a single-needle sewing state, and when the other excitation coil 17 is energized by the conduction of the transistor 18, the piston rod 8a is The left hand 4 is moved to the other side, and the left hand 4 is stopped and the right hand 5 becomes a one-needle state, and the two excitation coils 15 of the electromagnetic switching valve are
17 are both energized, a spring means (not shown) is applied to the switching air cylinder 8 and the swinging lever 13.
), the needle twill mechanism assumes a two-needle sewing state. The structure of the sliding sliding door operating device connected to the needle mechanism is basically the same as that of Jitsukoshi Sho 52-8799 No. 52-8799 (sliding sliding sliding door operating device) filed by the present applicant. While the No. 52-8799 model employs a manual sliding lever, the present invention differs in that a switching air cylinder 8 is used instead of the sliding sliding lever. A DC motor 19 is connected to the main shaft 2 of the sewing machine via a belt 20, and is attached to the lower surface of the table 1.

A foot pedal 21 is supported on a support shaft 22 fixed to the table 1, and can be depressed on the toe side and the heel side.

Further, the foot pedal 21 is connected to input signal generating means in a fixed switch box 24 on the side of the DC motor 19 via a lotus cage 23. In the switch box 24, a low level voltage signal (0 volts, hereinafter referred to as "0") is generated when the foot pedal 21 is depressed on the toe side.
a toe-side depression signal generator 25 that generates a high-level voltage signal (5 volts, hereinafter referred to as "1") upon release of the pedal; a heel-side depressing signal generator 26 that generates a signal of "0" and generates a signal of "1" upon release of the depressing; and the DC motor 9.
Speed control variable resistor 2 for changing the command speed of
7 are arranged.

Further, the arm 27a of the speed control variable resistor 27 is operatively connected to the foot pedal 23, and the arm 27a of the speed control variable resistor 27 is operatively connected to the foot pedal 21
It is designed to move according to the toe side of the foot. Reference numeral 28 denotes a position detector, which includes a permanent magnet piece (not shown) that rotates in conjunction with the sewing machine main shaft 2, a Hall element 29 for detecting the needle lower layer arranged around the permanent magnet piece, and a needle upper layer detecting element 28. It consists of a Hall element 30 for detection and a Hall element 31 for thread cutting position detection.

These Hall elements 29, 30, and 31 generate an output of "0" when the position is detected. 32 is a speed detector,
It consists of a magnetic pole wheel (not shown) attached to the sewing machine shaft 2 and having north and south poles arranged alternately, and a speed detection magnetoresistive element 32a disposed relative to the magnetic pole wheel.

Next, the speed control circuit shown in FIG. 4 will be explained. The DC motor 19 is connected to an AC power source 33 via a full-wave rectifier 34.

35 is a driving power transistor connected in series to the DC motor 19, and 36 is a dynamic braking power transistor connected between power supply terminals 37 and 38 via a braking resistor 39.

These power transistors 35 and 36 are controlled to accelerate, decelerate, stop, etc. by the voltage from the speed control unit 40. Further, between the 15 volt power line 41 and the 0 volt power line 42 connected to the speed control unit 4, an arm 43a of a variable resistor 43 for low speed setting can be moved by hand by the operator. . Further, the speed command voltage is applied to the input terminal 44 of the speed control unit 40 from three routes.

The first is that the voltage from the low speed setting variable resistor 43 is passed through the diode 45 and the normally open contact 46b of the first reed relay 46, and the second is that the voltage of the power line 42 is passed through the second reed relay. 47 normally open contact 47b, the third
The voltage from the speed control variable resistor 27 is applied via the normally open contact 48b of the third reed relay 48 and the diode 49. The coils 46a, 47a, 48a of those first to third reed relays 46, 47, 48 are as follows:
Transistors 5 connected to each other as shown in FIG. 5A.
0,51,52. Reference numeral 53 denotes a thread cutting magnet coil for activating a known type of thread cutting device, which is energized by conduction of a transistor 54.

Next, the corner stitching control circuit shown in FIGS. 5A, 5B, and 5C will be explained.
The lead wires indicated by 7 are connected to the lead wires indicated by the same symbols in the upper part of Fig. 5B, and the lead wires indicated by YI to Y9 in the lower part of Fig. 5B are connected to the lead wires indicated by 5C in the lower part of Fig. 5B. It is connected to a lead wire indicated by the same reference numeral in the upper part of the figure.

In FIG. 5A, 55 is an OR circuit 56 and an OR circuit 57.
! In the first flip-flop constructed as follows, the OR circuit 56 inputs the output of the OR circuit 51 and the output of the AND circuit 58. The output and the output of the inverter 60 are input. 61' and the OR circuit 62
and an OR circuit 63;
In addition, an OR circuit 63 combines the power of the OR circuit 62 and the first
The output of the OR circuit 57 of the flip-flop 55 is inverted by the inverter 64, and the output of the inverter 64 is inverted.
The input is an output of 0.

65 is an AND circuit which inputs the output of the OR circuit 63 of the second flip-flop 61 and the output of the inverter 64 ~ 66 inputs the output of the AND circuit 66 and the Q output of the D-type flip-flop 59 In the OR circuit, the output is applied to the base of the transistor 50 and the output is applied to the base of the transistor 50 via the inverter 67.
1 and is further applied as one input of the AND circuit 68.

69 is an output obtained by inverting the output of the thread cutting position detection Hall element 31 from the inverter 701 and the inverter 6
This is an AND circuit which receives the output of the transistor 54 as an input, and its output is applied to the base of the transistor 54.

Further, the D-type flip-flop 69 has a data input terminal D connected to a high voltage source, and a clock input terminal which receives as a clock input an output obtained by inverting the output of the hall element 29 for detecting the needle down position by an inverter 71'. C, a set input terminal S whose input is the output of a power-on reset circuit that generates an output of "1" when the power is turned on, a set input terminal R whose input is the output of the inverter 73, and the output terminal Q. and has.

The output of the power-on reset circuit 72 is also input to the set input terminal S of the O-type flip-flop 59, as well as the OR circuit 74 and inverter 75 of the inverter 60. Waveform shaping circuit for converting the sine waveform from the resistive element 32 into a rectangular wave, 77
78 is an OR circuit whose inputs are the output of the waveform shaping circuit 76 and the output of the inverter 73, and 78 is the OR circuit 77.
80 is an integrating circuit for speed detection that receives the output of the AND circuit 78 as input, and includes resistors 83, 82, 83, and a capacitor 84.
, including a diode 85 whose output is connected to the inverter 7
3 is applied as an input.

86 is a 5-bit shift register for controlling the progress of the total angle operation, and the first to fifth registers 86 to 868
Each register has a clock input terminal C, a data input terminal D, a set input terminal S, and a reset input terminal R.
and an output terminal Q.

Also, as shown in FIG. 6a, among the 5-bit shift register 86, the first register 86A has a two-needle total period A.
The second register 86B corresponds to the needle 4 by the end of one needle.
, 5 corresponds to the period B until the needle stops downward, the third register 86C corresponds to the period B until the needle stops downward, and the fourth register 86C corresponds to the period B until the needle stops downward.
6D corresponds to the single-needle sewing period D after turning the cloth, and the fifth register 86E indicates that the sewing machine 3 is driven at low speed for one or two stitches after switching from the single-needle sewing state to the double-needle sewing state. This corresponds to the period E (this is to cover the delay in the operation of the switching air cylinder 8, etc.). Further, the output of the OR circuit 87 is applied to the set input terminal S of the first register 86A and the reset input terminal R of the second to fifth registers 86B to 86E. It is also applied to the set input terminal S of the -S flip-flop 89.

The reset force terminal R of the first register 86A and the set input terminals S of the second to sixth registers 86B to 86E are grounded. Furthermore, the output terminals Q and data input terminals D of each register 86A to 86E are mutually saddled.
90' is an OR circuit whose output is applied to the clock input terminals C of the first to fifth registers 86A to 86E and also applied to the other input terminal of the OR circuit 88.

Reference numeral 91 denotes an AND circuit whose inputs are an output obtained by inverting the output of the toe side stepping signal generator 25 by an inverter 92 and an output of the output terminal Q of the first register 86A, and its output is input to the OR circuit 79 and the output terminal Q of the first register 86A. It is applied to the base of the transistor 52.

In addition to the output of the AND circuit 91, the OR circuit 79 also includes a fifth register 86E and a second register 86E.
8. The output of the output terminal Q of the fourth register 86D is applied as an input. Reference numeral 93 denotes one stitch number counter for counting the number of stitches in a state where one needle length is set by the pre-reading switching air cylinder 8, and the count is generated in synchronization with the movement of the needles 4 and 5. a tarlock input terminal C which receives as an input an output obtained by inverting the pulse output from the needle upper layer detection hall element 30 as a pulse by an inverter 94; and a set input terminal R which receives as an input the output of the OR circuit 88. It has an output terminal B which generates an output of "1" when the number of stitches set by a stitch number setting device, which will be described later, matches the stitch number pulse.

95 to 100 are first to sixth stitch number setters connected to the stitch number counter 93 and capable of individually setting the setting state of the stitch number counter 93; among these, the first to fifth stitch number setters; 95 to 99 are for individually arbitrarily setting the number of single-needle sewing stitches up to five corners that are continuously formed, and the sixth stitch number setting device 100 is the one shown in FIG. This is for setting the number of stitches in period E.

Reference numeral 101 denotes a corner stitch number counter that can be switched between an addition mode and a subtraction mode for counting every time one corner stitch is completed.When the counter is inputted as "1", it becomes addition mode and becomes "0". The mode switching terminal U/○ terminal which becomes the subtraction mode at the time of input, the clock input terminal C which inputs the output of the OR circuit 102, the reset input terminal R, and the first
to the fifth output terminals BI to B5.

Reference numeral 103 denotes a monostable multipipulator, which has a reset terminal R that is reset by the output of the inverter 75, and which connects the OR circuit 63 of the second flip-flop 61.
When the output becomes "0", a pulse signal of a constant width is generated at the output terminal Q, and the output thereof is applied as the other input of the OR circuit 74.

The output of the OR circuit 74 is further applied as one input to the OR circuit 87, and is also applied to the corner stitch number counter 1.
It is applied to the reset input terminal R of 01. In addition to the output of the OR circuit 66, the AND circuit 68 receives as input an output from an input means 104 that generates one pulse of "0" every time it is operated by the operator. is applied to the input terminal of the OR circuit 87, and is also applied to the mode switching terminal U/D via one input terminal of the OR circuit 102 and the inverter 105.
As a result, when the input means 104 is operated, the corner stitch number counter 101 is temporarily switched to the subtraction mode, and a count pulse is inputted to return to the "previous corner total completion state".Of course, the input means 104 On the contrary, when the corner sewing number counter 101 is not operated, the total number of corner stitches in the addition mode is counted.The input terminal of the OR circuit 87 is connected to the switching switch 15 for normal sewing and corner foot sewing. The output of the AND circuit 106 is applied as an input to the other input terminal of the OR circuit 102. 107 to 111 are connected to These are first to fifth selection means for arbitrarily selecting which of the left and right single-needle stitches should be applied to the five corner sections to be formed, and basically has the same configuration.

12 to 116 are AND circuits, one input terminal is applied with the outputs of the output terminals BI to B5 of the corner stitch number counter 101, respectively, and the other input terminal is applied with the OR circuit 1.
17 outputs are applied as inputs.

In addition, the OR circuit 117 receives outputs from the output terminals Q of the fourth register 86D, second register 86B, and third register 86C. Reference numerals 118 to 122 denote first to fifth selection switches whose ends are grounded, and when they are opened, the left needle 4 is paused and the right needle 5 can perform single-needle stitching. Conversely, when the sewing machine is closed, the right needle 5 is paused and the left needle 5 can perform single-needle stitching.

123 to 127 are AND circuits, one input terminal of which is connected to the output terminals of the AND circuits 112 to 116, and the other input terminal connected to the first to fifth selection switches 118 to 122.

128 to 132 are inverters connected to the first to fifth selection switches baking soda 8 to 122. 133 to turtle 37 are AND circuits, one input terminal of which is connected to the output terminal of the inverters 28 to 132, and the other The input terminals of are connected to AND circuits 112 to 116.

Reference numeral 138 denotes an OR circuit which receives the outputs of the AND circuits 23 to 27 as inputs, and its output is applied to the base of the transistor 16. Further, 139 is an OR circuit which receives the outputs of the AND circuits 33 to 137 as inputs, and its output is applied to the base of the transistor group 8. Tortoises 40 to 44 are inverters that receive the outputs of the AND circuits 12 to Tomomi 6, and their outputs are also the same as those of the first to fifth gates.
is connected to the stitch number setters 95 to 99' and applied to the bases of transistors 145 to 149. Also t 15
8' is a transistor connected to the sixth stitch number setting device 100, and the output of the output terminal Q of the fifth register 868 is applied to its base. When any one of the transistors 145 to 150 is made conductive, the stitch number setting device connected to that transistor is selected and the number of stitches set by the selected stitch number setting device is determined. When the number of stitches counted by the stitch number counter 93 matches, "
An output of "1" is generated from output terminal B. Reference numeral 151 denotes a corner stitch number setting device for setting the number of corner stitches, which is connected to the collectors of the transistors 45 to 149, and when the transistor corresponding to the set number of corner stitches is turned on, a signal of "0" is output from the output terminal B. ”, which is inverted by the inverter 152 and sent to the R-S flip-flop 8.
An input signal is applied to the reset input terminal 9.

Reference numeral 153 is an AND circuit which outputs an output obtained by inverting the output of the heel side stepping signal generator 26 from a converter 154', a Q output of the O-type flip-flop 59, and the first
The output from the output terminal Q of the register 86A is input, and the output is applied to one input terminal of the AND circuit 58, IQ6.

Further, the output terminal Q9 of the R-S flip-flop is applied to the other input terminal of the AND circuit 58 and the input terminal 06. word 54 is the output of the inverter 92;
This is an AND circuit whose input is the output of the output terminal Q of the third register 86C. Further, the output of the AND circuit 154 of the OR circuit 9, the output of the AND circuit 106, and the output of the counting counter 93 are input. Further, the actual configuration of the corner stitch number counter 101 includes a binary counter and a decoder that decodes the output of the binary counter into a 1Q Hayabusa code, and the output terminals BI to B5 are connected to this counter. This is the output terminal of the decoder.

A segment conversion element 7 is further connected to the built-in counter output of the corner stitch number counter 101, and a numeric display 158 consisting of a segment LED (light emitting diode) is further connected to this segment conversion element 151. This numeric display 158 is for displaying the number of corner stitches in which the corner stitches are located, and the number display 158 is also mounted at an easily visible position on the front of the sewing machine 1, as shown in FIG. Next, the operation of corner stitching will be explained with reference to FIG. 6a. First, the selector switch 156 is opened in advance to enable the corner stitch control circuit and the , first to fifth changeover switches 11
8 to 122 cutting simulations, i-th to 6th stitch number setting devices 9
It is necessary to perform a setting operation of 5 to 100 and to set the number of corner stitches using the corner stitch number setting device 151 in advance.

The number of stitches set by the first to fifth counter setting devices 95 to 99 is determined by the degree of turn of the fabric when moving from one double needle stitch to the next two needle warp, that is, the sewing pattern. The larger the degree of turn, the larger the set number of stitches needs to be. Further, it is usually sufficient to set the low speed period to one or two stitches when switching from one needle warp to two needle stitches using the stitch number setting device turtle 801. After making these various settings, corner stitching is performed in the following order.

{1} In the power-on state, when the power is turned on, the output “1” of the reset circuit 72 is blocked.
Since it is inverted by the inverter 6G and applied to the first flip-flop 55, the output of the OR circuit 57 becomes "1", and the output of the OR circuit 5 becomes "OJ".

The output of the OR circuit 57 is inverted by the inverter 4 and applied to the second six flip-flops, so that the output of the OR circuit 63 becomes "1" and the output of the OR circuit 62 becomes "0".
becomes.

Since the output of the inverter 64 becomes "0", the AND circuit 6
The output of 5 becomes "1" and the output of AND circuit 69 becomes "0"
becomes. The thread trimming magnet coil 53 is energized by the "0" output from the ASOD circuit 69. In addition, since the O-type flip-flop 59 is set by the output of the power-on reset circuit 72, its Q output is "1", and the inputs of the OR circuit 66 are all "1", and its output is "0". becomes. Therefore, the coil 46a of the first reed relay 46 is deenergized, and conversely, the transistor 51 is turned on via the inverter 67, and the coils 47a of the four second reed relays are energized. As a result, the normally open contact 47b in FIG.
9 is stopped. Further, since the foot pedal 21 is not depressed in any direction, the output of the toe-side depression signal generator 25 is "1", and this is inverted by the inverter 92, so the output of the AND circuit 91 is "0". ”, and the third reed relay 48 is not energized. Further, since the output "1" of the power-on reset circuit 72 is applied to the set input terminal S of the first register 86A via the OR circuits 74 and 87, the output of the output terminal Q becomes "1".
Also, the second to fifth registers 86B to 86
8 reset input terminal. Since the voltage is applied to R, the output of its output terminal Q becomes "0".

The output of "1" from the OR circuit 87 is inputted to the stitch count counter 93 via the OR circuit 88, and the counter is reset. Furthermore, the output of "1" from the OR circuit 74 is also applied to the square stitch number counter 01, and the counter is also reset. At the time of this reset, an output of "1" appears at the output terminal BI of the total number of corners counter 101. Also, at this time, the second to fourth registers 86B, 86
Since the outputs of the output terminals Q of C and 86D are both "0", the output of the OR circuit 117 is "0", and since this is applied to one input terminal of the AND circuits 112 to 116, their outputs are "1". Therefore, AND circuit 12
The outputs of 3 to 127 and 133 to 137 become "0," and the outputs of the OR circuit 138 and wealth 39 become "0," and the excitation coil 15 and the wire 7 are both energized, resulting in a double-needle sewing state. Furthermore, the number 1 is displayed on the number display 158 to indicate that it is the first angle longitude. ■ Foot pedal 2
1. Double-needle sewing state due to toe side depressing...When the foot pedal 21 is pressed toward the toe side during period A of Fig. 6a, the output of the toe side depressing signal generator 25 becomes "0" and "
This is inverted by an inverter 92 and an AND circuit 91
is added as one input.

At this time, "1" of the first register 86A of the shift register 86 has already been input to the other input terminal of the AND circuit 91.
Since the output of the output terminal Q is applied, the output becomes "1", the transistor 52 becomes conductive, the coil 48a of the third reed relay 48 is energized, and its normally open contact 48b is closed. , the speed command voltage from the speed control variable resistor 27 is now applied to the input terminal 44. Since the output "1" of the AND circuit 91 is also applied to the OR circuit 79, the output of this OR circuit 79 becomes "0".
Because of this "0" output, the output of the AND circuit 78 is "0".
'', which is inverted by the inverter 73 and applied to the reset input terminal R of the D-type flip-flop 59, the output of its output terminal Q becomes ``0'', and this ``0''
'' is applied to the input terminal of the OR circuit 66, so the output of the OR circuit 66 becomes ``1'', and contrary to the above, the transistor 50 becomes conductive and the first reed relay 46
The coil 46a is energized, its normally open contact 46b is closed, and the command voltage set by the low speed setting variable resistor 27 is applied to the input terminal 44. On the other hand, the transistor 51 becomes non-conductive, and the coil 47a of the 21st J-driving relay 47 is energized, so that the stop command is eliminated. Then, sewing machine 3 starts operating.

At this time, when the foot pedal 2i is simply lightly depressed toward the toe, the arm 27 of the speed control variable resistor 27
Since point a is in the state where the speed command is the smallest (lower part in FIG. 4), the low speed command voltage from the low speed setting variable resistor 43 is higher, and the DC motor 19, that is, the sewing machine is driven at low speed. Thereafter, when the foot pedal 21 is depressed toward the toe side, a speed command voltage is applied from the speed control variable resistor 27, and the sewing machine 3 is operated at a speed corresponding to the depression of the foot pedal 21. Become so. (3' A state in which the needle is stopped when the foot pedal 21 is released from the toe side...the end point of period A in Fig. 6a) When the two-needle sewing state is finished and the next time the corner stitch is to be started, two needles are lowered. When the needle sewing state is completed to the required position, the toe side depression of the foot pedal is released.

As a result, the output of the toe-side stepping signal generator 25 becomes "1", which is inverted by the inverter 92 and added to the AND circuit 911, so its output becomes "0" and "this causes the transistor 52 to become non-conductive. Then, the coil 48a of the third reed relay 48 is deenergized.At this time, the first and second reed relays 46 and 47 remain in their previous states, and the DC motor 19 is controlled by the low speed setting variable resistor 43. The low speed command to be set is input terminal turtle 41
Even when this voltage is applied, the power transistor 36 for dynamic braking becomes conductive, and the sewing machine 3 is rapidly shifted to a low speed operation state. On the other hand, since the output of the AND circuit 91 becomes "0", the output of the OR circuit 79 becomes "1", and this causes the output of the AND circuit 78 to become "1".
is applied to one input terminal of At this time, the other input terminal of the AND circuit 78 is connected to the speed detection magnetoresistive element 3.
Since the output obtained by shaping the output of 2a by the waveform shaping circuit 76 is applied via the OR circuit 77, the output of the AND circuit 78 repeats the "1" and "0" states depending on the speed. This output is integrated by the speed detection integration circuit 3, and when the speed reaches a constant speed (a value close to the value set by the low speed setting variable resistor 43), the output becomes "1".
This is inverted to a 0'' output by the inverter 73, and the reset input of the D-type flip-flop 59 is removed. In this state, the needle lower layer detection Hall element 29
When an output of “0” is generated from the inverter 71
The clock is inverted and applied to the clock input terminal C of the ○-type flip-flop 59, and then applied to the clock input terminal C of the D-type flip-flop 59.
The output of the output terminal Q becomes "1".

This "1" output causes the first flip-flop 55 to
The output of the OR circuit 57 becomes "0", which is inverted by the inverter 64, so that the second flip-flop 61
The output of the OR circuit 63 becomes "0".

Because of this “0” output, the output of the AND circuit 65 is “0”.
As a result, both inputs of the OR circuit 66 become "1" and its output becomes "0". This results in
The conduction and non-conduction of the transistors 58 and 51 are controlled, and the DC motor 19 is stopped in the same way as when the power is turned on. {4
) Corner stitching is started by pressing the heel side of the foot pedal 2. When the foot pedal 21 is then pressed with the heel, the corner stitching is started in section B of Fig. 6a.
0'' is generated and applied to one input terminal of the AND circuit 153, but at this time, the AND circuit 153 has already received the output terminal Q of the D-type flip-flop 59.
Since the output of ``1'' and the force of ``1'' of the output terminal Q of the first register 86A are applied, the output of the second register 86A becomes ``1''.

Also, the set input terminal S of the R-S flip-flop 89
Since the output IJ of the OR circuit 87 is applied when the power is turned on, the output of the output terminal Q is "0". Therefore, the AND circuit 186
Both inputs become "1", and the output becomes "1". Since this is applied to nine OR circuits, even if the output of the OR circuit becomes "1", this "1" output is applied to the clock input terminal C of the shift register 86, and a 1-bit shift is performed. Therefore, the output of the output terminal Q of the second register 868 becomes "1", and all other outputs become "OJ
It is. On the other hand, since the output of the OR circuit 90 is also inputted to the stitch number counter 93 via the OR circuit 88, the counter is also reset. Since the shift register 86 has been shifted, the output terminal Q of the second register 86B becomes "1".
'' is applied to the OR circuit 117, so the output of the OR circuit 117 becomes ``1'', which is applied to one input terminal of the AND circuits 112 to 116.
The output of the AND circuit 112 of the first selection means 107 is "0".
'', and now if the first selection switch 118 is closed, the output of the AND circuit 123 becomes ``1'', which is added to the OR circuit 138, and its output becomes ``1''.
Therefore, the transistor 6 becomes conductive and the excitation coil 15
is energized, the air cylinder 8 for the fusuma is activated, the right needle 5 is stopped, and the left needle 4 is in a single-needle sewing state. On the other hand, since the output of the output terminal Q of the second register 86B becomes "rl", the output of the OR circuit 79 becomes "0".
This is applied to one input terminal 78 of the AND circuit 78, and its output becomes "0".

Therefore, the O-type flip-flop 59 is reset, and its output becomes "0". Therefore, the output of the OR circuit 57 of the first flip-flop 55 becomes "1", which is inverted by the inverter 64, and the output of the OR circuit 68 of the second flip-flop 61 becomes "1". Since the output of the inverter 64 is "0", the output of the AND circuit 65 is "1", but the OR circuit 66 has a D
Since the output "0" from the type flip-flop 58 is applied as an input, the output is "1" and the sewing machine 3 is driven at low speed as described above. At this time, since the output of the output terminal Q of the first register 86A is "0", the output of the AND circuit 91 is "0", and high-speed operation of the DC motor 19 is prevented. In this way, the single needle operation is performed at low speed, and during this time the stitch number counter 93 counts the stitch number pulses generated from the needle upper layer detection Hall element 30.

■ Needle down stop state after the count up of the stitch number counter 93... Point C in FIG. Since the output is inverted to "1" from the inverter 1401 and applied to the base of the transistor 145,
The transistor 145 becomes conductive, and the first stitch number setting device 9
5 has been selected, and now the number of pulses counted by the stitch counter 93 matches the number of stitches set by the first counter setting device 95.
An output of "1" is generated from the output terminal B of the stitch number counter 93.

As a result, the shift register 86
At the same time as the stitching is performed, the stitch number counter 93 is reset via the OR circuit 88. Due to the shift of the shift register 86, the output of the output terminal Q of the third register 86C becomes "1", and the other registers 86A, 868, 860,
The power of 86E is all "0".

From this, the AND circuit 91 connected to the input terminal of the OR circuit 79, the fifth register 868, and the second register 86
B, the output of the fourth register 86D is all "0",
The output of the OR circuit 79 becomes "1". This results in
This output of "1" is applied to one input terminal of the AND circuit 78, and the output repeats "1" and "0". Since the speed of the sewing machine at this time is low, the output of the speed detection integrating circuit 80 becomes "1" after the charging time of the capacitor 84 has elapsed.
Since it is inverted by the inverter 73, D
The reset input of the type flip-flop 58 is removed, thereby causing the needle lower layer detection Hall element 2 to operate in the same manner as before.
When there is an output from 9 to 0, the D-type flip-flop 59 is set and the needle down of the sewing machine 3 is stopped. [6' Single needle sewing start state from the needle down state... After the needle 4 is stopped downward during period D in Fig. 6a, the fabric is moved by the needle 4.
When the foot pedal 21 is depressed toward the toe side, the output of the toe side depression signal generator 25 becomes "0", which is inverted by the inverter 92 and becomes "1", which becomes the AND is applied to one input terminal of circuit 154.

Since the output of “1” from the output terminal Q of the third register 86C has already been input to the other input terminal, the power of the AND circuit 154 becomes “1”, and this is transmitted through the OR circuit 90. The signal is applied to the clock input terminal C of the shift register 86, and the shift register 86 is further shifted by one bit, and the counting counter 93 is reset via the OR circuit 88. Fourth register 86
Since the output of the D output terminal Q becomes "1", the output of the OR circuit 79 becomes "0", and the D-type flip-flop 58 is reset in the same manner as described above, and the sewing machine 3 is started again. Start moving at low speed.

At this time, the output "0" of the first register 86A is applied to one input of the AND circuit 91, so high-speed driving is inhibited. Further, since the output "1" of the shift register 86 is continuously applied as an input to the OR circuit 117, the output does not change. In this way, operation is performed again using only the left hand 4, and the stitch number counter 93 starts counting again. '7'
State of switching from single-needle sewing to double-needle sewing...Figure 6a
Transition from the end of the D period to the E period When the sewing by the left needle 4 progresses and the count content of the stitch number counter 93 matches the number of stitches set by the first stitch number setting device 95, the output of the counter 93 An output of "1" is generated from the terminal B, which is applied to the clock input terminal C of the shift register 86 via the OR circuit 90, and the shift register 86 is shifted. will be reset.

Since the output of the output terminal Q of the fifth register 868 becomes "1", the sewing machine 3 continues to be driven at a low speed, but the second , 3 "Register 86B, 86C of 4?
Since all outputs of 860 are "0", OR circuit 11
The output of the AND circuit 112 becomes "0", and the output of the AND circuit 112 becomes "0".
1'' and the AND circuit turtles 23 to 127, 133 to 137 outputs are all ``0'' and the OR circuits 138, 13
All of the forces at 9 become "0", the single needle sewing state is automatically switched to the double needle sewing state, and double needle sewing is started.

At the same time, the output of the output terminal Q of the fifth register 868 of the shift register 86 becomes "1", so that the transistor 150 becomes conductive and the sixth stitch number setting device IQO
is selected. {8' After switching to double-needle sewing, the period set by the sixth stitch number setting device 100 has elapsed and the sewing machine 3 is at high speed... Period E in FIG. 6a has ended. Then, after 1 or 2 stitches have passed since double needle sewing started, the stitch number counter 9 is displayed.
When the count of 3 matches the number of stitches set by the sixth stitch number setting device 10, an output "1" appears from the output terminal B of the stitch number counter 93.

As a result, the shift register 86 is shifted and the stitch number counter 93 is reset in the same manner as described above. As a result, the output of the output terminal Q of the first register 86A becomes "1".
As a result, both inputs of the AND circuit 9 become "1", its output becomes "1", the transistor 52 becomes conductive, the coil 48a of the third reed relay 48 is energized, and the sewing machine 3 is turned off by the foot pedal. The vehicle is driven at a speed corresponding to the depression of the pedal 21. t9} When the foot pedal 21 is pressed with the heel for the second corner stitching When the foot pedal 21 is pressed with the heel for the next corner sewing, "0" is output from the heel side signal generation layer 26 in the same manner as the previous time. The output is inverted by the inverter 154 and applied to one input terminal of the AND circuit 106;
Since the output "1" of the output terminal Q of the flip-flop 89 is applied as a force, the output of the AND circuit 106 becomes "1", and the shift register 86 is shifted and the stitch number counter 93 is reset via the OR circuit 90. is performed, and a second corner stitch is made in exactly the same manner as the previous time.

At this time, the output "1" of the AND circuit IQ6 is applied as a clock input to the corner stitch number counter 101 via the OR circuit lo2, and this time it is carried forward from the previous one and is B2.
An output of "1" appears from the output terminal. For this reason,
This time, the second selection means 108 is selected, the transistor 146 is turned on, and the second stitch number setting device 96 is selected. As a result, the second selection means 108 and the second
Corner stitching in the mode set by the stitch number setting device 96 is performed in exactly the same machine as the first time. The same goes for the third, fourth, and fifth angle meridians.

Then, the clock input terminal C of the corner stitch number counter 101
Each time one corner stitch is completed and the next corner stitch is entered, a clock pulse is applied (by stepping on the heel of the tabletop bell 21) to select the selection stages 107 to 111 and the stitch number setting device necessary for the next corner stitch. 9
5 to 99 etc. are prepared, and the display 158 shows,
Numbers 1, 2, 3, 4, and 5 are displayed to indicate which corner stitch part the sewing is in. '10 After completing the set number of corner stitches, the needle is stopped, the thread is trimmed, etc., and each time the heel of the foot pedal 21 is depressed, the next corner stitch is started. Among the transistor turtles 45 to 149 for selecting the setting devices 95 to 99, when the transistor corresponding to the number of corner stitches set by the total number of corner stitches setter 151 conducts, the number of corner stitches setter 151 , an output of ``0'' is generated, and when it is inverted to an output of ``1'' by the inverter 152 and inputted to the reset terminal R of the R-S flip-flop 89, the output of the output terminal Q becomes ``0''. C. The output of the output terminal Q becomes "1".

Therefore, when the heel of the foot pedal 21 is depressed, the output of the AND circuit 153 becomes "1" as described above, and as a result, both the outputs of the AND circuit 58 and turtle 06 become "0".
”. The fact that the output of the AND circuit 106 is "0" means that the shift register 86 is not shifted and the stitch count 93 is not reset, as was the case with the previous angle meridian. This means that corner stitching will not be repeated any more. on the other hand,
Since the output of the AND circuit 58 becomes "0", the output of the OR circuit 56 of the first flip-flop 55 becomes "1".
The output of the HOR circuit 57 becomes "0", and the "0" output is inverted to "1" by the inverter 64 and applied to one input terminal of the OR circuit 63 and AND circuit 65 of the second flip-flop 61. be done.

At this time, the output relationship of the second flip-flop 61 is such that the output of the OR circuit 62 is "0" and the output of the OR circuit 63 is "0".
Since it remains at "1" and does not change, both inputs of the AND circuit 65 become "1" and its output becomes "0". Therefore, the output of the O circuit 66 becomes "1", and in the same manner as described above, the coil 46a of the first relay 46 and the coil 47a of the second reed relay 47 are energized, and the sewing machine 3 is rapidly activated. The speed will be shifted to deceleration. Thereafter, when the low speed is detected and the lower layer of the needle is detected in the same manner as described above, the output of the D-type flip-flop 59 becomes "1" and is applied to one input terminal of the OR circuit 66. Then, the needle begins to move upward passing through the needle lower pupil at a low speed, and when it reaches the thread trimming position, the thread trimming position detection Hall element 31 changes to "0".
” is inverted by the inverter 70, both inputs of the AND circuit 69 become “1”, and its output becomes “1”.
'', the transistor 54 becomes conductive, the thread trimming magnet coil 53 is energized, and thread trimming is performed. After thread cutting is completed, when the needles 4 and 5 reach the upper position, an output of "0" is generated from the needle upper layer detection Hall element 30, thereby inverting the output state of the second flip-flop. The OR circuit 63 generates an output of "0". As a result, the output of the AND circuit 65 becomes "1",
Both inputs of the OR circuit 66 become "1", and its output becomes "0".
”. As a result, the first reed relay 46 is energized, the second reed relay 47 is energized, and the sewing machine 3 is stopped at the needle upper layer. Furthermore, due to the detection of the upper layer of the needle, the output state of the second flip-flop 6 is reversed and the output of the OR circuit 63 becomes "0", so that the output terminal Q of the monostable multipipulator IQ3 has a predetermined value. A pulse of width is generated, which is passed through the OR circuits 74, 87, 88 to set the initial state of the shift register 86 and to set the stitch number counter 9.
3, and the corner stitch number counter 101 is reset.

In this way, the corner sewing work is completed.

Note that the number of corner stitches can be freely set using the corner stitch number setting device 151. (11) Operation for returning to the previous state of completion of corner stitching when thread breakage, etc. occurs during corner stitching.
If a thread breakage or the like occurs during corner stitching, the operation of the input means 104 allows the sewing machine to return to the previous state where the corner is completely finished.

That is, when the input means 104 is operated, its output becomes "0", and this "0" output is sent to the AND circuit 68.
is applied as one input of On the other hand, when the driving of the sewing machine 3 is stopped, the output of the OR circuit 66 is "0". 1”. As a result, the output "1" is inverted by the inverter 105 and applied to the mode switching terminal U/D of the total angle counter 101, and the counter 101 is temporarily switched to the subtraction mode, and the OR circuit 102
The signal is also applied to the clock input terminal C of the corner stitch number counter 101 via the counter 101, and subtraction by one is performed. At the same time, the output of "1" from the AND circuit 68 returns the shift register 86 to its initial state (the state at power-on) via the OR circuit 57, and also returns the output "1" to the stitch number counter 93 via the OR circuit 88.
will also be reset. As a result, the total corner control circuit is in the state of the previous total completion of the corner, that is, the 2
Since it is possible to return to the full needle section, the operator can redo corner stitching by heeling down the foot pedal 21 after threading.

The operator is free to decide whether to redo the corner stitching or to thread the needle after the thread breakage and continue sewing from the point where the thread breakage occurred. However, as a practical matter, it is effective to redo the square warp when a thread breakage occurs during single-needle sewing, and even after finishing single-needle sewing and starting double-needle sewing. It is not a good idea to start over. It should be noted that the return to the previous corner stitch state can be achieved by operating the input means 104 once, and by repeating this operation two or three times. ,
The corner stitch state can be shifted to the previous corner stitch two or three positions.

This state is also indicated by a numeric display 158. (Switching state from corner stitching to normal stitching in step 1) If the changeover switch 156 is now opened, an input of "1" is applied to the OR circuit 87, so the shift register 86 is set to the initial state and the stitch number counter 93 is set to the initial state. By resetting the sewing machine and maintaining the same state as the two-needle sewing state during corner sewing, normal sewing with two needles can be performed.

The configuration and operation of this embodiment are as described above.

Next, considering a modification of the present invention, in the above embodiment, one stitch number counter 93 and five stitch number setting devices 95 to 99 were used to set the one-needle sewing period. , five brisset counters for determining five single-needle sewing periods may be used, or a timer may be used to determine the single-needle sewing period instead of a stitch count counter. Also,
In the above embodiment, the heel of the foot pedal 21 is used to enter the square meridian, but the two-needle sewing period is determined by the number of stitches counter in the same way as the one-needle foundation period, and the two-needle sewing period is determined by the stitch number counter. One-needle sewing may be automatically started by counting up a stitch counter that determines the period. At that time, it will be possible to construct a highly automated two-needle corner stitch sewing machine that does not require a foot pedal. still,
The effective switching means is not limited to one sliding air cylinder 8, but various forms such as two air cylinders or a solenoid are conceivable. The present invention has the configuration as described in detail above, and the switching means can arbitrarily select which of the left and right single-needle stitches is to be applied to the single-needle stitching state with respect to a plurality of continuously formed corner-stitched portions. Since a plurality of selection means are provided for selecting the sewing period and the same number of period setting means are provided corresponding to the plurality of selection means for determining the sewing period in the state of single needle sewing, the sewing When performing consecutive corner stitches with different conditions, it is sufficient to make selections using the selection means and settings using the period setting means in advance, as in the conventional method.
There is no need to switch between left or right single-needle sewing or to set the number of stitches each time one corner stitch is performed.
The efficiency of double needle corner stitching work can be greatly improved.

[Brief explanation of drawings]

Fig. 1 is an overall front view, Fig. 2 is a partially enlarged front view showing the needle mechanism, Fig. 3 is an enlarged top view showing the surrounding area of the switching air cylinder 8, and Fig. 4 is The speed control circuit diagrams, Figures 6A, 5B, and 5C are one control circuit diagram that is divided into three parts for convenience of drawing drawings (Figure 5A).
The lower part of the figure is connected to the upper part of figure 5B, and the lower part of figure 5B is connected to the upper part of figure 5C); Figures 6b and 6c, which are explanatory diagrams showing the sewing order, are drawings showing an example of a sewing pattern having a plurality of corner stitches. In the figure, 2 is the main shaft of the sewing machine, 3 is the sewing machine, 4 and 5 are the needles, and 6 is the sewing machine main shaft.
7 is a needle bar, 8 is an air cylinder for cutting, 15 and 17 are excitation coils, 19 is a DC motor, 21 is a foot pedal, 2
5 is a toe side stepping signal generator, 26 is a heel side stepping signal generating device, 27 is a variable resistor for speed control, 28 is a position detector, 35 is a driving power transistor, 36 is a braking power transistor, 4 speeds A control unit, 44 is an input terminal, 46 is a first reed relay, 47 is a second reed relay, 48 is a third reed relay, 55 is a first flip-flop, 59 is a D-type flip-flop, and 6 is a second flip-flop. 86 is a 5-bit shift register, 86 is an R-S flip-flop, 93 is a stitch number counter, 95 to 100 are first to sixth stitch number setters, 10
1 is a corner stitch number counter, 103 is a monostable multivibrator, 104 is an input means, 107 to 111 are first to fifth selection means, 118 to 122 are first to fifth selection switches, 151 is a corner The sewing number setting device 158 is a numeric display device. Figure 1 Figure 2 Figure 3 Figure 4 Figure 4

Claims (1)

[Scope of Claims] 1. Two-needle stitching in which a stitch is formed by two needles spaced apart from each other on the left and right, and 1. A stitch is formed by stopping one of the needles at a corner. A sewing machine equipped with a needle bar mechanism capable of performing regular needle sewing, a driving means for driving the sewing machine, and a needle bar operatively connected to the needle bar mechanism so that the sewing machine is driven by the driving means. a switching means for switching the mechanism between the double-needle sewing state and the single-needle sewing state on either the left or right side;
a plurality of selection means for arbitrarily selecting which of the left and right single-needle sewing states to be applied to a plurality of corner-stitched portions that are continuously formed when the single-needle sewing state is to be set; and a single-needle sewing by the switching means period setting means similar to the plurality of selection means provided to determine the sewing period in the state in which the stitching is performed; and after the two-needle sewing state, the plurality of selection means are sequentially enabled and switched to the single needle sewing state selected by the enabled selection means, and 1 only for the period set by the period setting means provided corresponding to the enabled selection means. a corner stitch control means for setting the main needle sewing state; and a corner stitch control means for setting the number of corner stitches by the control means in one sewing operation, and when the number of corner stitches matches the number of corner stitches actually performed, the control means 1. A control device for a two-needle corner stitch sewing machine, characterized in that a control device for a two-needle corner stitch sewing machine is provided. 2. The corner stitching control means is configured to automatically operate the switching means to enter a double needle stitching state after the period set by the period setting means has elapsed. A control device for a two-needle square stitch sewing machine according to item 1. 3. The control device for a double corner stitch sewing machine according to claim 1 or 2, wherein the switching means includes one switching air cylinder. 4. 2 as set forth in claim 1, wherein each of the plurality of selection means includes one selection switch.
Control device for main needle square stitch sewing machine. 5. Claim 1, wherein the plurality of period setting means includes a counting means for counting counting pulses generated in synchronization with the movement of the needle of the sewing machine.
A control device for a two-needle square stitch sewing machine as described in Section 1. 6. The counting means individually sets a readout state of one stitch counter that counts counting pulses generated in synchronization with the movement of the needle of the sewing machine, and a stitch counter connected to the stitch counter. 6. The control device for a two-needle square stitch sewing machine according to claim 5, further comprising a plurality of stitch number setting devices. 7. The control device for a two-needle corner stitch sewing machine according to claim 1, wherein the corner stitch number control means includes a corner stitch number counter that counts each time one corner stitch is completed. 8. The control device for a two-needle corner stitch sewing machine according to claim 7, wherein a corner stitch number setting device for setting the number of corner stitches is connected to the corner stitch number counter. 9. The corner stitch number counter is an addition/subtraction counter that can be switched between an addition mode and a subtraction mode, and the addition/subtraction counter is always set to one mode and sequentially counts the number of corner stitches; Claim 7: The input means is connected to the addition/subtraction counter and is configured to temporarily switch the addition/subtraction counter to another mode and to input a count pulse so as to return to the previous corner stitch completion state. A control device for a two-needle square stitch sewing machine according to item 1 or 8. 10. Claims 7, 8, or 9, characterized in that the corner stitch number counter is connected to a display device for displaying the number of corner stitch portions to be sewn. A control device for the two-needle square stitch sewing machine described above.