JPS58144161A - Apparatus for repairing lost stitch of multi-head automatic embroidering machine - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-head automatic embroidery machine equipped with a plurality of sets of sewing needle heads, and more particularly to a missing stitch repair device for repairing missing stitches in any of the needle heads.

Conventionally, in this type of multi-head automatic embroidery machine, if thread breakage occurs in at least one head during operation, the thread breakage detection circuit provided in each head detects the thread breakage and the machine The machine is temporarily stopped, and the operator replenishes thread to the thread breakage area and restarts the operation, but it is inevitable that some of the sewing thread will be missing at this thread breakage area. Also, depending on the nature and condition of the thread, missing stitches may occur that cannot be detected by the thread breakage detection circuit, so the missing stitches must be filled in at a separate location after the sewing work is completed, or the same section may be repeated again. There was no way to sew it and fill in the missing parts. Particularly in the latter case, the embroidery stitches on the head without missing parts were turned over, inducing overlapping stitches. Therefore, if a missing part occurs in a seam, making it a normal series of stitches is not only a very difficult task, but also affects the work of the head who performs other normal stitches. I felt the need to give.

The present invention completely eliminates the above-mentioned conventional drawbacks, and even if a seam is missing on any of the heads, it can be repaired accurately and reliably by performing work on each head individually. This makes it possible to accurately obtain a normal series of seams regardless of the missing repair work.

That is, the present invention provides a multi-head automatic embroidery machine having a plurality of sets of heads, each of which is equipped with a thread breakage detection circuit and a blank line mechanism for interrupting the sewing operation. a circuit that generates a simultaneous idle signal that causes the idle mechanism to work simultaneously at a preset timing; a manual pushbutton means that generates an instruction signal corresponding to each of the heads; A circuit is provided which generates an individual blank wire prohibition signal corresponding to each of the above heads during operation of the signal generation circuit to prohibit the blank wire mechanism operation of the corresponding neck, and prevents the blank wire of the prohibition circuit from operating. This is a new missing stitch repair device that uses the detection signal of the thread breakage detection circuit or the instruction signal of the instruction button means as the prohibition signal, and the This system utilizes a wire mechanism to repair the missing seam by prohibiting empty thread work on the head where the seam is missing and allowing the machine to sew. This allows the goal to be easily achieved.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.

Figure 1 shows the overall configuration of a multi-head embroidery machine. For example, three sewing machines H1, H2, H3 are mounted on a base B.
They are connected via a sewing machine main shaft S so as to be mechanically driven synchronously by a sewing machine driving motor M. Each head H1,
H2, H3 sewing needle N1. N2. Embroidery frame F corresponding to N3
l, F2. F3 is placed, loading frame Fl, F2 . F3 is X
They are sequentially driven by motors Mx and My corresponding to the Y direction and the Y direction via interlocking levers Ll and L2, respectively. The control computer CPU, which controls the drive of the embroidery machine, reads paper tape data using a tape reader PTR, for example, and then prints the sewing needles N1. N2. Driving Na and the above frames Fl, F2
．． F3's X.

Controls drive in the Y direction.

Each head H1, H2, H3 includes a link take-up, a needle bar and a sewing needle Nl that move up and down with a crank arm, etc., as shown in FIG.
N2. 2. A thread breakage detector Kl is equipped with N3 and a thread tightening mechanism (these are similar to those of a normal sewing machine), and further detects thread breakage in the thread path and stops the machine. 3, and the empty stitch mechanism T1. which interrupts the sewing mechanism to form a blank stitch. T2. Equipped with T3. The empty wire mechanism TI, T
2. T3 is composed of a fixed position coupling clutch called a single position clutch, and is connected to the main shaft S of the sewing machine and the crankshaft W1 of each head. W2. A solenoid SOt, 1,5OL2, which is interposed between Wa and operates each clutch;
When an empty line signal is input to 5OLa, the sewing operation of the sewing mechanism is temporarily interrupted.

The empty wire signal above is the solenoid 5OL1, 5OL2゜5O
Drives La and the single position clutch-r
l, -r2. Turn on Ta.

The pulse generator PG1 connected to the sewing machine main shaft S is connected to the tI
A synchronizing signal is generated every revolution of IIIllS. When the operation button PB4 provided on the control panel (not shown) is turned on, the drive motor M is driven and the computer CPU is turned on. Further, the stop button PB5 similarly manually stops the driving motor M. When the reverse button PBQ is manually turned ON, the data tape of the tape reader PTR is read backwards without rotating the main shaft S, and the frame drive motor M x in the X and Y directions is turned on.
, M y to move the mounting frames L1 and L2 backward.

Additionally, optional repair instruction buttons PBI, PB2. PH1 is connected to the thread cutter detector Kl, 2. Manually remove missing stitches such as embroidery that 3 could not detect.
, H2, and H3 are illustrated.

In FIG. 3, K1, 2, and 3 are thread breakage detectors provided in each head, and are turned on when each thread breaks, and are connected to flip 70 knobs FFI corresponding to each thread breakage detector.

FF2. Set FFa (MC14013, manufactured by Motorola). Flip-flop FF1. FF2゜FFs
When any one of them is set, the computer CPU is operated according to the output of the seven lip flop FF4 to automatically stop the driving motor M. PH4 is a run button, and when turned on manually, the computer CPU is activated by the output trap of flip-flop FF4 to start the driving motor M.

Similarly, the stop button PB5 is manually turned on to reset the flip-flop FF4, operate the computer CPU, and stop the driving motor M. Only when the reverse button PBQ is manually turned ON when the drive motor M is stopped, the reverse pulse generator PG2 (NE555) outputs a tape reverse signal to the computer CPU, causing the frame drive motors Mx and My to move in the reverse direction. let If the reverse movement button PBQ is turned OFF, this backward movement will be stopped. The pulse generator PG1 is synchronously connected to the main shaft S of the sewing machine, and generates a synchronization signal every - rotation to the flip-flop FFI.

FF2. Update FF3. □ The above-mentioned backward pulse generator pc2 simultaneously increments the backward stitch number counters COU and NT1, and sets the flag (Flag) (J2
) from 1 to 0. A flag of 1 indicates that there is no reverse operation, and a flag of 0 indicates that a reverse operation of at least one stitch has been performed.

At the same time, the backward stitch number counter GGLJNT 1 counts down by the pulse of the pulse generator PGl, and when it returns to the old position, the flag is changed from 0 to 1.

MMI is a flip-flop FFI, FF2. The state of FF3 is now the flip-flop group FF'1, FF'
2. It is a mono multivibrator that transfers in FF type. (MCI4538, manufactured by Motorola) MM2 is a mono multivibrator (MC14538, manufactured by Motorola)
By turning on the operation button PB4, 7 rip 70 rip F
Reset Flt, FF12, and FF'3.

The driving motor M drives the sewing machine sewing mechanism.

The tape reader PTR transfers embroidery data to the main shaft S of the sewing machine.
data is given to the computer CPU in response to the rotation of the The computer CPU uses frame drive motors Mx and My to move embroidery frames Fl, F2 . F3 to X, Y
The idle stitching mechanism TI, T2. It is composed of a normal arithmetic processing unit for numerical control that drives T3 and forms the side picture pattern.

The solenoid groups 5OLI, 5OL2, 5OL3 of the empty it/1 mechanism 1"t, -[2, T3 are connected to each head t(1, H
2. The sewing mechanism of H3 is temporarily interrupted and the idle stitching mechanism is driven to perform idle stitching. In addition, the computer CPU is instructed to skip tape data from the tape reader PTR.
outputs a simultaneous emptying signal J1, and this signal causes the solenoid groups 5OL1, 5OL2, and 5OLa to be suction driven all at once to perform simultaneous emptying. Relays R1, R2, and R3 use closing contacts for each of the solenoid groups 5OL1, 5OL2, and 5OLa, and at least one of the relays R1, R2, and R3 is activated by a flip 70 knob in response to a thread breakage signal from the thread breakage detector K. FF11. It is driven ON depending on the state of FF/2 and FF/3, and when it is ON, the corresponding solenoid 5OLI
, 5OL2, and 5OLa are inhibited from being sucked all at once.

For example, when 1 is turned ON in the thread cutter detector, 5OL1 will not be sucked due to the operation of the corresponding solenoid relay R1 even if there is an instruction for -air line. In addition, the other solenoids 5OL2 and 5OL3 maintain the attracted state due to the operation of relays R2°R3 and continue to idle all at once, that is, the flip-flops FF'1, FF'2,
FF'a individually drives relays R1, R2, and R3 to prohibit idle stitching. Similarly, t8: Repair instruction button P
B1. PB2. With PH1, empty stitching can also be prohibited by manually driving relays Kl, R2, and R3 for each head individually.

If thread breaks during embroidery work with an embroidery machine configured as shown in Figures 1 to 3 (if contacts 1 to 3 are ON at the thread breakage detection timing), the thread breakage signal will be sent to FF1 to FFa. At the same time, FF4 is reset by the OR signal of ORI and the operation signal is OF.
F, the sewing machine stops, and the display lamp PL1. PL2. P
La indicates the thread breakage head. In addition, in this state of thread breakage, the mono multivibrator MMI is activated by the output signal of the OR gate OR1, and the flip 70 knobs FFII to F
If you recognize that the unnecessary motor is held in F/3 and press the reverse instruction button PBQ, the reverse pulse generator PG2 will be activated.
A backward pulse is generated, and this pulse increments the backward stitch number counter C0UNT1. The frame driving direction path drives the frame from the tape reader PTR in accordance with this reverse pulse, reads the data manually, and returns the embroidery process in the reverse direction.

The worker checks the movement of the frame and finds that the pattern is missing due to thread breakage. When the frame has returned to a point where it can be repaired, the worker releases the reverse instruction button PBQ, and then presses the operation button PB4 to start embroidery in the forward direction again. Start.

During this time, the backward stitch number counter C0UNTI is incremented, and as a result, the signal of count value 0 of C0UNT1, that is, the zero signal, disappears, and the output of the OR gate OR3 causes the jump thread/id 5.
OLI, 5OL2, and 5OLa are driven, but only the head where the thread breakage occurred is driven by the output of the flip 70 knobs FF/1 to FF'a to drive the solenoid drive prohibition relay K1-43, and the jump solenoid is prohibited from being driven. Embroidery is possible. When the operation button PB4 is pressed, the flip-flops FF1 to FF3 are reset by the start signal and the threads are
The burnout indicator lamps PLI to PLa are turned off, flip-flop FF4 is set, and operation is restarted, but only the heads to be repaired held in flip 70 knobs FF/1 to FF/3 are embroidered, and the repair is thus carried out. be done. At this time, a backward stitch count counter ωUNT1 is generated by the thread breakage detection timing pulse that is output once per revolution of the main shaft S of the sewing machine.
is counted down and when the repair is executed for the number of backward stitches, a zero signal is generated at the count value 0, the drive of jump solenoids 5OLI, 5OL2, and 5OLa is released, and all heads H1, H2, and 83 are embroidered. Restart and return to normal embroidery work. Further, the rise of this zero signal activates the mono multivibrator MM2, and the output of this MM2 resets the flip-flops FFII to FP3 and releases all the relays R1 to R3. If a thread breakage is detected and the machine is stopped, the reverse stitch count counter will continue to output a zero signal and the jump solenoids 5OL1, 5OL2, 5OL will be activated unless a reverse direction instruction is issued.
When a is not driven and restarted by the operation button, when the zero signal is ON by the start signal, the mono multivibrator MM2 is triggered and the transferred and held flip 70 knobs FF/1 to FF/3 are reset. and resume normal embroidery.

Next, the operation of the control circuit shown in FIG. 3 will be explained using flowcharts shown in FIGS. 4 and 5.

First, FIG. 4 (0) shows the operating state when only the thread trimming detection mechanism operates in FIG. 4, and FIG. 4 (B) shows the operating state when the empty stitching mechanism operates. FIG. 5 shows the operating state when the repair mechanism operates.

In Figure 4 (a), ■To start operation■Run button P
When B4 is pressed, the output of flip-flop FF4 causes ■
When the sewing machine drive motor M starts, the tape reader P
TR reads data for one stitch. Which tape data includes the amount of XY movement, etc. Based on this tape data, the computer CPtJ moves the frame L1 . L2 is driven in the X and Y directions, and at the same time the sewing machine sews one stitch. Next, 2. At least one of 8 is ONI, or the stop button PB
Depending on whether 5 is pressed, the computer CP [J is YE
If S, stop the drive motor M, if No, then
Determine whether the tape data indicates termination.

If the end instruction is NO, the computer CPU returns to reading the next tape data. If the end instruction is YES, ■Sewing of that pattern is completed.

In Figure 4 (b), ■ To start operation ■ Press the operation button ■ Drive the drive motor M, ■ Computer CPU
reads the tape reader PTR sword/ra needle data, and based on this tape data, the frame drive motor Mx,
Frame Lx, L2 woX from My K.

Move it in the Y direction. Next, the computer CPLI determines whether or not there is a blank stitch instruction mark in the tape data of the tape reader PTR, and the [phase] N is selected.

In this case, the sewing machine sews one stitch, then determines whether the thread breakage detector or stop button is turned on and performs the operation as shown in FIG. 4 (0). In addition, if the tape data has a mark for empty stitching instructions (YES), ■class solenoid group 5OLI,
5OL2 and 5QL11 are driven by suction to perform blank stitching,
After the empty stitching is completed, [phase] solenoid groups 5OLI, 5OL2
, 5 OL 8 is released, and then ① yarn breakage detection or ON/OFF determination of the stop button is started, and the operation as shown in FIG. 4 (a) is performed in the same manner as above.

In the flowchart shown in Figure 5, the operation of the thread trimming detection mechanism is exactly the same as (a) in Figure 4 (a), and the operation of the empty stitching mechanism is exactly the same as (b) in Figure 4 ←). Since they are the same, they will be omitted.

In FIG. 5, after the sewing machine has rotated for one stitch regardless of the simultaneous driving of the idle stitching mechanism T, the [phase] reverse stitch number counter C0
Determine whether flag J2 of UNT 1 is O or not, and select NO.
When , [phase] Flip-flop FF for prohibiting individual idle line operation
'! ,, FF'2. FF'8 is reset,
When YES, ■Reverse stitch number counter C0UNT 1 is counted down every time the main shaft S of the sewing machine rotates.

Next, ■If any of the thread breakage detectors detects a thread breakage, or if the stop button PB5 is turned on, the fourth
Different from the case shown in the figure, if 1' is ONI in at least one of the [phase] thread breakage detectors, the corresponding flip-flops FFI, FF2, FF2, FF2, FF2, etc. FF8fONl, corresponding thread breakage indicator lamp PL 1. PL2, PLs
On the other hand, it drives the output duck multivibrator MMI of OR1 and flip-flop FF1.
The state of the individual blank wire prohibition flip-flop F F'
1, and the main shaft S of the sewing machine, that is, the machine, is stopped by flip-flop FF4. As a result of this transfer, [phase] the relay R1 of the relevant head is suction driven, and idle stitching by the corresponding solenoid 5QLs is prohibited. Therefore, the moment a thread breakage occurs, empty stitching for the head is individually prohibited.

The above is a case where the thread breakage detector 1 detects a thread breakage, but if the operator finds a missing stitch that cannot be detected, press the [phase] stop button PBEi to stop the machine and remove the missing stitch. When the repair button PB1 of the head is pressed and YES is ON, the corresponding flip-flop FF'l for prohibiting individual blank stitching is set, and relay R1 individually prohibits blank stitching of the head. be done. With the above steps, preparations for repair are complete.

Next, when the operator presses the [phase] reverse button PBo, when the reverse button is ON (YES), the [phase] reverse stitch number counter C0UNT1 is incremented by the reverse pulse generator PG2, and at the same time, the [phase] computer CPU is The tape data is read backwards by one stitch, the [phase] blank line solenoids SQL1, 5OL2, 5OLa are driven all at once, and the frame drive motors Mx and My move the frames Lt and L2 in the XY direction backwards in the XY direction. After this time, the flag J2 of the backward stitch number counter changes from 1 to 0. Further retrograde button PB5
If you keep pressing ``, the same cycle as in the second paragraph will be repeated, and it will continue to move backwards. When the reverse button PB5 is turned OFF, that is, when the answer is NO, the operator presses the [phase] operation button PB4 to cause the computer CPU to start normal forward operation. Whether the operation button PB4 is ON or not, that is, when it is ON (YES), the sewing machine main shaft S rotates, so the reverse stitch number counter C0UNT1 starts counting down, and [phase] the output of the flag J2 is 0 or not. When NO, [phase] mono-multivibrator MM2 switches to flip-flop F'1 for individual empty wire.
．． F F'2. Reset F F'8. 0
When the answer is YES, normal operation is resumed.

When the operation button PR4 is pressed, the thread trimmer detector K or optional repair instruction buttons PBI, PB2. Flip-flop for prohibition of repair individually according to PLs F'11F F'
2. Relay R1, R2゜R via F F'8
8 prohibits empty stitching for the relevant head, so as long as the flag J2 of the reverse stitch number counter C0UNT 1 is 0, that is, as long as reverse stitching is given, the empty stitching solenoid group SOL 1+ SOL 2 ＋SOLa
1 performs a sewing operation on the head concerned, even though they are simultaneously performing blank stitches. That is, 2°R8 other than the head is empty stitching, and the head Klm performs the sewing operation for repair work. As the repair operation progresses in this way, the reverse stitch number counter C0UNT1 counts down, and eventually when the flag J2 reaches 1, the mono multivibrator M
The output of M2 resets the flip-flops FF'l and FF'2°F F'8 for prohibiting individual classes, and at the same time, the blanking is terminated at the same time. In this way, the repair work is completed, that is, after passing the previous reverse start point, normal operation is automatically resumed.

Therefore, as shown in Fig. 6, the head H1, R2゜H8 was sewn normally from [O to [l], and at 11 the head H1 [thread breakage occurred and the process continued as it was]. If it stops at time 2, the head H1 has [1 or [2].
Missing seams will occur during this time. After stopping all at once at time point [2, the embroidery hoop is moved backwards to the position of [8, ie, the beginning of the above-mentioned missing line, by pressing the reverse button PBo.

After that, when the operation button PB4 is pressed, the blank line continues until the point t4, that is, the previous stop point, but only the head H1 is excluded from the blank line, and when sewing is executed and reaches point 14, the reverse stitch Number counter C0UN:jl flag J2
, the position is recognized and the blank line state is canceled all at once, and thereafter each head H1, H2, and Hll continues normal parallel sewing work.

In this case, it is necessary for the operator to thread the thread through the needle between the head H1 where the thread is broken and the length between [2 and L8].

Therefore, the missing portion of the head H1 is repaired, and the repair does not affect the sewing patterns of the other heads H2, H) at all.

In other words, each of the heads H1, Hz, and Ha can repair the defects and perform normal sewing continuously.

As shown in Figure 7, any PBI
, PB2. PBJI is flip-flop FFI, FF2
．． A similar effect can be achieved by connecting it to FF8.

As described in detail in the above embodiments, the missing stitch repairing device for a multi-head automatic embroidery machine according to the present invention has a simultaneous blank stitching system that causes all blank stitching mechanisms of each head to perform blank stitching at the same time at a preset timing. a manual pushbutton means that generates an instruction signal corresponding to each of the above-mentioned heads; and a manual push-button means that generates an instruction signal corresponding to each of the above-mentioned heads; A circuit for prohibiting the operation of the idle stitching mechanism of the corresponding head that generated the prohibition signal, and a detection signal of the thread trimming detection circuit or an instruction signal of the instruction button means as the idle stitching prohibition signal to the prohibition circuit. It has a simple configuration including a connection circuit for inputting data, and can easily repair missing seams by using a blank stitching mechanism.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the overall configuration of a multi-head embroidery machine according to the present invention, Fig. 2 is an explanatory diagram showing details of the sewing machine head of the embroidery machine shown in Fig. 1, and Fig. 3 is an embroidery machine shown in Fig. 1. The automatic repair control circuit diagrams installed in the machine, Figures 4G) and (B) and Figure 5 are flowchart diagrams each explaining the operation of the circuit diagram in Figure 3, and Figure 6 is a flowchart diagram explaining the operation of the circuit diagram in Figure 5. The explanatory diagram, FIG. 7, is a circuit diagram showing a modification of FIG. 3. Ht, H2, H8... Sewing machine head, El, F, 21F
B., Embroidery hoop, N 1. N2. N s-Sewing needle, Mx. Mγ... frame drive motor, Kl, 2. 8... Thread breakage detector, PBI, PB2. PB8...Repair instruction button, PBo...Reverse button, CPU...Computer, FF 1. FF2. FF8. FF't, FF'2
゜F F's...Flip-flop, TI, T2. T
I... Blank line mechanism, 5OL1, 5QL2, 5OLs-blank line sovoid, R1, R2, R8... Relay.

Claims (1)

[Claims] (1) In a multi-head automatic embroidery machine that has multiple sets of heads each equipped with a thread breakage detection circuit and a blank stitching mechanism that interrupts sewing work, all blank stitching mechanisms of the heads are set in advance. A circuit that generates a simultaneous blank stitching signal that causes blank stitching to be performed all at once at a set timing, a manual pushbutton means that generates an instruction signal corresponding to each of the heads, and , a circuit that generates an individual idle stitching prohibition signal corresponding to each of the heads to prohibit the operation of the idle stitching mechanism of the corresponding head, and the thread trimming detection circuit is connected to the idle stitching prohibition signal of the prohibition circuit. A missing stitch repair device for a multi-head automatic embroidery machine, characterized in that the detection signal of the above or the instruction signal of the instruction button means is used.