JPS5940038B2 - electronic sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic sewing machine in which a seam forming device executes pattern sewing in response to a pattern information signal, and in particular includes a buttonhole overlocking pattern as the pattern information and a buttonhole overlocking pattern. At the moment, either side of the buttonhole is
To provide an electronic sewing machine equipped with a status display device indicating whether overlock stitching is being performed.

When sewing buttonholes on an electronic sewing machine,
On one side of the buttonhole, a zigzag stitch is formed while moving the fabric forward, and once this is completed, on the other side of the buttonhole, a zigzag stitch is formed while the fabric is fed backwards.

The zigzag for buttonhole stitching has a fine mesh and the amount of fabric feed is small, so there is a problem that it is difficult to immediately check the direction of fabric feed.On the other hand, with conventional sewing machines, the fabric feed status is not displayed, During the automatic operation of the Kaga6, there was a drawback that the user had to move his eyes close to the needle of the sewing machine if he wanted to be sure of the direction in which the fabric was being fed.

The present invention has been made to eliminate the above-mentioned drawbacks, and it is an object of the present invention to provide an electronic sewing machine that can display the direction of cloth feed.

An embodiment of the present invention will be described below with reference to the drawings.

Fig. 1 is an external view of one embodiment of the present invention, where M is the main body of the sewing machine, LA and LB are lamps that display manual and automatic buttonhole stitching, KA is a manual pushbutton for buttonhole stitching, and KB is a buttonhole button. is an auto push button, and EA and EB are displays showing the operation contents of push buttons KA and KB.

In addition to the above-mentioned pushbuttons, the sewing machine main body M is provided with various pattern designating keys at a portion indicated by K, but these keys are not directly related to the present invention and will not be described here.

FIG. 3 shows an embodiment of a control circuit for an electronic sewing machine to which the present invention is applied, and LA and LB are the lamps shown in FIG. 1.

A6 and A7 are AND gates provided corresponding to the lamp LA, and a signal F□ generated during manual buttonhole stitching is applied to each AND gate A6 and A7, and one side of the buttonhole is applied to the AND gate A6. 1st on the side
A steady signal is applied to the flip-flop f5, which is set while the buttonhole stitching is being carried out in the direction of
Furthermore, the AND gate A7 has the above-mentioned Noritsubu flop f5.
The output of an inverter 11 that inverts the output of , and a pulse SS of an appropriate period are applied.

The output of A6 sA7 is OR gate OR
2 to the lamp LA.

In the above configuration, when the buttonhole stitching is being performed in the direction (■) on one side of the buttonhole 5 as shown in FIG. 4, a steady signal is sent from the AND gate A6 to the lamp LA via the OR gate OR2. applied to the lamp LA
is lit steadily.

Moreover, when the other side of the buttonhole 5 is being operated in the direction ■ in FIG. applied to LA, lamp L
A blinks.

Therefore, the user of the sewing machine can recognize in which direction buttonhole stitching is being performed by looking at the lighting state of lamp LA.

The lamp LB is continuously lit or blinks in the same manner as described above when buttonhole stitching is being automatically executed.

Next, the control system for buttonhole stitching will be described in detail with respect to the circuit shown in FIG.

In Figure 3, DM is the sewing machine mechanism section (stitch forming device)
The other control circuit parts are composed of LSI.

The ROM (IJ-only memory) stores various pattern generation information to be sewn, retrieves the corresponding pattern generation information in response to commands from the pattern keys, and uses that information to generate pattern data to control the sewing machine. , this data is R
It is stored in AM (random access memory).

The pattern data corresponds to the pattern. That is, for example, to explain the buttonhole pattern shown in Figure 4, the pattern data is for each stitch (stitch with thread attached, indicated by .)
The X coordinate and the X coordinate are digitally coded as shown in FIG.

The X coordinate is the left and right deflection amount of the needle 3, and the X coordinate is the feed amount of the cloth feed plate 4.

The pattern data in the RAM is retrieved for each stitch in synchronization with the synchronization signal β, which represents the movement of the sewing machine's main shaft, and is converted into an analog signal, which displaces the needle and fabric feed plate to place a stitch at a predetermined position on the fabric. Form.

The positioning of the needle and cloth feed plate is performed when the needle is away from the cloth.

In this example, the seam coordinates are 32X as shown in Figure 2.
32 X, Y coordinates X.

=X31 x Yo -Y 3t, the position of the needle is represented by the X coordinate, and the position of the cloth is represented by the X coordinate.

Further, the coordinate signals stored in the RAM have the following relationship.

X coordinate Cloth feed table position RAM data Yo
Maximum feed amount in the negative direction oooo.

Y15 Center position 01111 Y31 Maximum feed amount in the positive direction 11111 3rd again
In the figure, KU is a key unit and a switch (not shown) for instructing various pattern patterns, and a manual button KA for buttonhole stitching.

It has an auto button KB.

Pattern data is stored in each ROM area PA, PB-1, PB-2, and PC-Pn, and the ROM area selection circuit SC
The data of each area is output in accordance with the command code from the game) and input to the RAM via the GR.

The ROM's PB-1 contains data for the forward direction of buttonhole stitching (■ direction in Figure 4), that is, the coordinate data in Figure 7, and PB-2 contains data for the backward direction (■ in Figure 4). , that is, the coordinate data of FIG. 8 is contained.

The RAM separately stores the X-coordinate component and the X-coordinate component of the pattern data in areas RX and RY, respectively.

AC is a RAM address register, and AD is an address decoder.

The address register AC sequentially counts and outputs the contents of the RAM each time a synchronizing signal β generated in synchronization with the up and down movement of the needle 3 is applied based on the operation of the foot switch SF of the sewing machine.

CO is an address register increment circuit for incrementing the register AC every time the synchronization signal β arrives.

The output of the X and Y coordinates of RAM are each in register BX.
, BY is temporarily stored.

Register BX has 6 bits, of which 1 bit is B.

is an address corresponding to the cloth feed amount when buttonhole stitching is performed in the nA region shown in FIGS. 7 and 8, and details will be described later.

) 1″ for the address, 0″ for the nB area
Contains.

The digital data in the registers BX and BY are converted into analog signals by the D-A converters DAX and DAY, and applied to the linear motor LMX for the needle 3 and the linear motor LMY for moving the cloth feed table 4 to form predetermined stitch coordinates. do.

JA is a judge circuit that judges the contents of the address register AC, and when the RAM address specified by the address register reaches the final position A Crn shown in FIG.
produces an output.

The judge circuit JA starts operating when the output of the flip-flop f1 or f2 is applied via the OR gate OR1, and supplies the output signal to the address determining circuit AP.
The address of address register AC is set to ACn in FIG.

NC is a register that stores the number of stitches when buttonhole stitching is progressing in the ■ direction in Figure 4, and CUC is a register N.
C is a count up circuit, CLC is a clear circuit,
ND is a register to which the count value of the register NC is applied via the gate G1 and is accumulated.

CDC is a countdown circuit for the contents of register ND.

Jo is a judge circuit that detects the contents of register ND.
When the content of D is °“0”, an output u 1 tt is produced.

fl to f6 are flip-flops, Fo to F5 are set signals for each flip-flop, A1 to A9 are AND gates, OR1 to OR3 are OR gates, 1 is an inverter, qA, qB.

qC is a one-shot pulse generation circuit, and QA or QC are its output signals.

Next, the operation of the above circuit will be explained.

Assume that flip-flops f1 and f2 have now been reset.

When manual pushbutton KA on the sewing machine body is pressed, one-shot pulse signal QA is generated from one-shot pulse generating circuit qA, and flip-flop f1 is set.

Then, before the T-type flip-flop f5 is set, the conditions for the signals F and QA are met and the signal S1 is generated, and the R
An instruction to the effect that the pushbutton KA has been pressed is given to the OM area selection circuit SC, and the ROM area selection circuit SC specifies the address of the PB-1 area where the data for the buttonhole stitching direction (■) is stored. .

With this designation, the data in the PB-1 area of the ROM, ie, the X and Y coordinate data in FIG. 7, is transferred to the RX and RY areas of the RAM via the gate GR.

Further, signals F5 and QA are applied to AND gate A1, and clear circuit CLC clears counter NC.

On the other hand, the flip-flop f5 is set, and the signal F5 is applied together with the signal F1 of the flip-flop f1 to the AND gate A6 to light up the lamp LA.

When the foot switch SF is pressed here, the motor 2 of the sewing machine starts, the main shaft 1 of the sewing machine rotates, and a synchronizing pulse β is generated.

On the other hand, the address data of address register AC is stored in RAM.
is applied, the data at the bottom of FIG. 4 is read out, l'-25J is transferred to register BX, "15" is transferred to BY, and linear motor LMX is driven by an amount corresponding to the above data "25". By swinging, the needle 3 is inserted into the upper end position 5a of the buttonhole 5 in FIG. 4, forming the first stitch.

As the main shaft 1 rotates, the needle rises, and when the next synchronizing pulse β occurs, the contents of the address register AC increase by 1, and the second data in the RAM, that is, the second row from the bottom in FIG. Data “4” and “15” are in registers BX and B
Y, the needle 3 swings to the left by an amount corresponding to "4" and forms a stitch at point 5b in FIG.

Since the Y coordinate during this time is "15", the cloth feeding table 4 does not move.

Thereafter, the same operation is repeated to form stitches at the upper end of the buttonhole 5 a plurality of times.

When the contents of address register AC reach ACn, RAM
A "1" signal indicating that the area has entered nA in FIG. 7 is generated in register B.

becomes °1". This °1" signal is applied to AND gate A2, and AND gate A2 applies a synchronizing pulse β to the count up circuit CUC to change the contents of register ND to 1.
Increase by increments.

Then, the nA area data in FIG.
The cloth feed table 4 moves forward two pitches at a time to form a zigzag stitch as shown in FIG. 5.

During this time, the lamp LA is lit steadily in response to the signal from the flip-flop f5, indicating that buttonhole stitching is being performed in the ■ direction.

The above operation changes the contents of address register AC to the seventh
When the final address ACm in the figure is reached, the judge circuit JA applies a signal to the address determining circuit AP to set the contents of the address register AC to ACn again.

If the foot switch SF is kept pressed, the stitches on the ■ side in FIG. 4 are formed overlappingly.

By activating the judge circuit JA with the signal from the OR gate OR and the duck flip-flop f1 or f2, the above resetting of the address counter AC can be done only for buttonhole stitching, and in other pattern modes. You can choose not to make any settings.

On the other hand, when the stitch on the ■ side has been formed to a predetermined length as described above, the foot switch SF is released and the push button KA is pressed again.

This point is now designated as point 5d in FIG.

As a result, when one shot qA outputs a signal, signal S2 is generated and ROM area selection circuit SC is set to PB-2.

After that, flip-flop f is set, and AND gate A6 is turned off and A7 is turned on.

Since a pulse signal SS of an appropriate frequency is applied to the AND gate A7, the lamp LA blinks at that frequency.

By applying the signal S2 to the ROM area selection circuit SC, the data in the PB-2 area of the ROM, that is, the data shown in FIG. 8, is sent to the RAM.

Further, the gate G0 is opened by the F5° QA multiplication signal, and the contents of the counter NC at the time when the push button KA is pressed again as described above are transferred to the counter ND.

The contents also remain in the naori counter NC.

Then, when the foot switch SF is pressed again, the address register AC increases each time a synchronization pulse β is added.
Data at addresses from the bottom to the top in FIG. 8 is read from the RAM, 5d.

After forming stitches between 5e, ACn' to AC
Based on the data until m' is reached, the stitch shown in FIG. 6 is formed on the right side of the buttonhole 5 in the direction of ■.

If the foot switch is continued to be pressed when the RAM address reaches ACm', the operation between LN and LN in FIG. 8 is repeated in the judge JA and the address determining circuit AP.

Next, at an appropriate point in time, for example, when the stitch returns to 5a after passing through ■ in FIG. f2 is set and fl is reset.

This closes AND gates A6 and A7, and lamp L
A is turned off, while flip-flop f6 is set, AND gate A8 is opened, and lamp LB is turned on, indicating that the mode has been switched to auto mode.

Furthermore, the output S1 is generated by the generation of the one-shot pulse signal QB, and the P B-0 area of the ROM is designated.
B-, the data in area, ie, the data in FIG. 7, is transferred to RAM.

When the foot switch SF is pressed here, the pattern P B -1 is executed in accordance with the arrival of the synchronized Hals β.

B when the stitch enters the nA area in Figure 7. = 1, so AND gate A3 counts down the synchronization pulse β
DC and subtracts the contents of register ND one by one.

When the contents of the register ND become O, in other words, the judgment circuit J is formed when a stitch is formed in the ■ direction by an amount corresponding to the stitch length 11 set during manual operation.

generates signal 94111, which opens AND gate A4 and generates a signal from one-shot pulse generation circuit qC.

By the generation of the QC pulse, the flip-flop f3 is set, and the signal 52=F, ・Q-A+QC is generated.
Data in the PB-2 area of the ROM is transferred to the RAM.

Gate G1 is also opened by the QC signal, and the contents of register NC are transferred to register ND.

Through this operation, the ■ stitch shown in FIG. 4 is formed.

Then, when entering the region LN, the AND gate A3 subtracts the contents of the register ND one by one through the synchronized Hals β.

When the stitch reaches 5a from the direction of ■, register N
The content of D becomes 0, and the judge circuit J.

produces a signal, and one-shot qC produces a signal.

As a result, the AND gate A generates a signal, the flip-flop f6 is reset, and the lamp LB blinks.

The output of the AND gate A5 causes the flip-flop f
4 is set, the clutch 6 is released by the signal from the flip-flop f4, the needle 3 does not move up or down even if the main shaft 1 rotates, and the buttonholing step 91 is completed.

FIG. 9 shows another embodiment of the present invention, in which the output terminal of the register BY for storing data in the Y-axis direction in the embodiment of FIG. At the same time, the output of the Y>15 side of the judge circuit JY is connected to the OR gate OR4, the output of the Y>15 side is connected to the AND gate A1o, and one input of the AND gate A1o is connected. A pulse signal SS is applied to the input signal, the output thereof is connected to an OR gate OR4, and the output of the OR gate OR4 is further connected to a lamp LA (or LB).

With the above configuration, when Y>15, that is, when the cloth feeding table is moving in the forward direction, the judgment circuit JY's Y>
When the output from the 15 side is directly applied to the OR gate OR4, the lamp LA is always lit.

Also, when Y15 is reached, that is, when the cloth feed table returns in the opposite direction, the Y15 side output is output from the AND gate A1o.
and a signal SS is applied to OR4,
Lamp LA blinks.

As described above, in this invention, in buttonhole stitching,
It is equipped with a manual mode switch for sewing the left and right stitches individually and an auto mode switch for sewing the left and right stitches in a series, and the display that displays the buttonhole mode selection corresponds to the switch that instructs these modes. Furthermore, the display body is controlled to be switched between a constantly lit state and a flashing state during sewing operation on one side of left and right overlocking and during sewing operation on the other side, and one display body indicates the selected state of the mode and the left and right sides. The selected state of the buttonhole stitching can be displayed multiple times, and the various buttonhole stitching statuses can be displayed in two ways.
The display can be efficiently displayed using a single display body, and an extremely advantageous display for the sewing machine, which is required to be miniaturized, can be provided.

[Brief explanation of the drawing]

Fig. 1 is an external view showing an embodiment of the present invention, Fig. 2 is a diagram showing an example of cloth feed coordinates, Fig. 3 is a circuit diagram showing an embodiment of the invention, and Fig. 4 is a buttonhole stitching diagram. Figure 5 is a diagram showing one side of the stitch in Figure 4, Figure 6 is a diagram showing the other side of the stitch in Figure 4, Figures 7 and 8 are button holes. FIG. 9 is a circuit diagram showing another embodiment of the present invention. M... Sewing machine body, LA, LB...
lamp.

Claims (1)

[Claims] 1. A memory that separately stores a first direction overlocking pattern on one of the left and right sides of a buttonhole and a second direction overlocking pattern on the other side. a manual mode switch for separately instructing a first direction overlock pattern and a second direction overlock pattern so that the number of vertical stitches of the overlock pattern can be arbitrarily set as a buttonhole pattern sewing instruction; and an overlock pattern. The number of stitches in the vertical direction responds to the switch signal of the manual mode switch and the auto mode switch that instructs to sew the first direction overlock pattern and the second direction overlock pattern consecutively according to the preset stitch number information. Each time the switch signal is input, the switch signal is switched between the first state and the second state. a circuit for instructing to read out overlapping patterns in a direction; and in the manual mode, when the circuit is in a first state, it reads out an overlapping pattern in a first direction from a storage means; A circuit reads out a directional sewing pattern from a storage means and performs sewing operation using that pattern while the foot switch is turned on, and a circuit that reads a sewing pattern in the vertical direction of the pattern when hemming the buttonhole in manual mode. The number of stitches of the overlocking pattern in the first direction is compared with the number of stitches held by the register in the auto mode, and when they match, the number of stitches from the overlocking pattern in the first direction is compared. The circuit that performs continuous stitching by switching to the second overlock pattern, the display bodies (LA) and (LB) corresponding to the manual mode switch and auto mode switch, respectively, and the display body (LA) corresponding to the manual mode switch in manual mode. a first display control means that lights up in response to the first operation of the switch to display the sewing operation in the first direction of overlocking, and blinks at a predetermined frequency in response to the second operation; and an auto mode switch. Means for lighting a display (LB) corresponding to the auto mode switch in response to the operation of the auto mode switch to indicate that the auto mode is present, and for detecting completion of a series of sewing operations in the first direction and the second direction. 1. An electronic sewing machine comprising: a second display control means for blinking at a predetermined frequency in response to completion detection of the electronic sewing machine.