JPS6152717B2 - - Google Patents

Description

Detailed Description of the Invention Technical Field The present invention relates to a multi-stitch sewing machine that forms a stitch pattern in which a plurality of sewing threads are passed between the stitches by overlapping stitches at the same location a plurality of times. It is something.

BACKGROUND OF THE INVENTION Some stitch patterns sewn by sewing machines are not only intended for decorative purposes, but also require sufficient stitch strength. In order to simply create sufficient seam strength, it is sufficient to repeat sewing the same stitch pattern multiple times at the sewing location, but on processed fabrics where accurate positioning is difficult, the stitches formed each time are It was extremely difficult to match the patterns accurately, and there was a drawback that the decorative value and commercial value were lost.

Purpose The present invention has been made against the background of the above circumstances, and its purpose is to provide a multi-stitch sewing machine in which stitch patterns can be accurately matched through simple operation.

Solution To achieve the above object, the multiple stitch sewing machine of the present invention has the following features: (1) A seam forming mechanism including a needle capable of reciprocating up and down; and a seam forming mechanism that operates to change the relative position of the needle and the workpiece cloth. (2) an information generating circuit capable of sequentially generating stitch position information for determining the forming position of each stitch in a predetermined stitch pattern; (3) reciprocating the needle up and down; a pulse generator that generates timing pulses in synchronization with the movement; (4) a period during which an odd number of three or more timing pulses is generated is defined as one cycle; The output information of the information generating circuit is transferred from the first stitch position information regarding the first stitch that is the stitch to the second stitch position information regarding the second stitch following the first stitch in each cycle. (5) an information update circuit for initially updating; and (5) position reversal information for returning the relative position from the second stitch forming position to the first stitch forming position during each cycle. (6) selecting the updated second stitch position information in response to a timing pulse generated at the beginning of the cycle; an information selection circuit for alternately selecting the position reversal information and its second stitch position information in response to each generated timing pulse, and operating the drive device in accordance with the selected information. The method is characterized in that each stitch in the predetermined stitch pattern is repeatedly formed an odd number of three or more times.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

In FIG. 1, a horizontal sewing machine arm 1 has a head 2 and a pedestal 3 at both ends thereof, and the pedestal 3 is erected on a base 4 so as to cantilever the sewing machine arm 1. There is. At the lower end of the head 2, there is a needle swing actuator 10 which is moved up and down with the rotation of a sewing machine main shaft (not shown) and which is a driving device.
A sewing needle 5 is provided which is positioned in a lateral swing position according to a needle positioning mechanism (not shown) driven by a sewing machine (see FIG. 2). A needle hole 6 through which the sewing needle 5 is inserted is formed in the base portion 4 at the drop point of the sewing needle 5, and a feed actuator 11 serving as a driving device is provided around the needle hole 6.
A feed dog 7 is provided in which the direction and amount of feed of the workpiece cloth can be adjusted in accordance with a feed adjuster positioning mechanism (not shown) driven by a feed adjuster (see FIG. 2). The sewing needle 5 and the feed dog 7 work together to form a stitch forming mechanism that forms a stitch pattern.

On the front surface of the sewing machine arm 1, there is a display panel 9 on which a plurality of pattern symbols 8 representing stitch patterns are displayed, a plurality of LED lamps 12 provided above the pattern symbols 8, and a plurality of LED lamps 12, respectively. A pattern display 14 consisting of a decoder driver (not shown) for lighting is attached. A push button switch 15 for selecting and operating the stitch pattern is provided at the right end of the display panel 9.
A changeover switch 16 for selecting normal stitching or multiple stitching is provided on the front surface of the sewing machine. Note that 17 is a start/stop push button switch for the sewing machine.

The sewing machine described above is equipped with a control circuit as shown in the block diagram of FIG.

The pattern selection device 20 includes the pattern display 14 and a push button switch 15, and outputs a pattern signal representing the stitch pattern selected by operating the switch 15.
The SM is supplied to the first address memory 21 and the last address memory 22, and the switch 15
An operation signal PN indicating that has been operated is supplied to the timing control circuit 23 (to be described later), and at the same time an input terminal of the address counter 25 is supplied to the input terminal of the address counter 25 via the OR circuit 24.
Supplied as a load signal to the LD.

In order to generate stitch position information for forming the stitch pattern represented by the input pattern signal SM, the head address memory 21 stores stitch position information in a stitch information memory 26 (to be described later) in which the stitch position information is stored. generates a first address signal SIA representing the first address in a series of addresses;
supply to

The end address memory 22 is an end address representing the final address of a series of addresses in the stitch information memory 26 in which stitch position information for forming the stitch pattern represented by the input pattern signal SM is stored. Generates address signal SEA and comparator 2
7 input terminal PA.

The address counter 25 receives the first address signal according to the load signal supplied from the OR circuit 24.
SIA is loaded, and the signal supplied from the OR circuit 28 is added to the first address signal SIA for counting, and an address signal representing the count contents.
SD to stitch information memory 26 and comparator 27
is supplied to input terminal PB of

The comparator 27 is a normal comparison circuit that generates an output signal when the signals supplied to the input terminals PA and PB match each other, and the address signal SD supplied to the input terminal PB is
If it matches the terminal address signal SEA supplied to PA, a load signal is supplied to the address counter 25 via the OR circuit 24.

The stitch information memory 26, which is an information generation circuit, includes:
Stitch position information that specifies each stitch position for forming a stitch pattern that can be sewn by the sewing machine is stored, and the stitch position information is stored at the address indicated by the input address signal SD. Output information. The stitch position information includes a pair of needle position information SB that commands the horizontal swing position of the sewing needle 5 and feed information SF that commands the position of the feed adjuster that adjusts the feed direction and feed amount of the feed dog 7. The needle position information SB is supplied to the input port PA1 of the multiplexer 28 and the latch 29, and the feed information SF is supplied to the input port PA2 of the multiplexer 28 and the information inversion circuit 30.

The latch 29 loads or holds (temporarily stores) hand position information SB in response to a timing signal CP3 from a timing control circuit 23, which will be described later, supplied to its input terminal CK. The position information LSB is supplied to the input terminal PB1 of the multiplexer 28.

The information inversion circuit 30 converts the supplied sending information SF
Among the feed amount and feed direction of the work cloth represented by , feed reversal information SFR indicating that the feed direction is reverse is calculated and supplied to the input port PB2 of the multiplexer 28.

That is, the latch 29 and the information reversal circuit 30 are a storage section and a calculation section that constitute a position reversal circuit, and the temporarily stored needle position information LSB and the feed reversal information SFR correspond to the stitch position at the time of reversal. form position reversal information that determines the

The multiplexer 28, which is an information selection circuit, selects a signal being supplied to one of the input ports according to the timing signal CP4 supplied from the timing control circuit 23, and outputs the selected signal from the output port. That is, when the timing signal CP4 is not input, the signal SB supplied to the input port PA1 is supplied to the latch 32 from its output port C1, and the signal SF supplied to the input port PA2 is supplied from the output port C2 to the latch 32. 33. On the other hand, when the timing signal CP4 is input, the signal LSB supplied to the input port PB1 is supplied to the latch 32 from the output port C1, and the signal SFR supplied to the input port PB2 is supplied to the latch 32 from the output port C2. 33.

The latch 32 and the latch 33 are the same as the latch 2 described above.
9, the information supplied from the multiplexer 28 is loaded or held (temporarily stored) in accordance with the timing signals CP5 and CP6 from the timing control circuit 23, and the signals LB and LF representing the respective contents are loaded or held (temporarily stored). It is supplied to the swing drive circuit 34 and the feed drive circuit 35.

The needle swing drive circuit 34 positions the sewing needle 5 at the swing position indicated by the supplied signal LB.
Drive power is supplied to the needle swing actuator 10. Similarly, the feed drive circuit 35 positions the feed adjuster at a position to adjust the feed direction and feed amount of the work cloth represented by the supplied signal LF.
Drive power is supplied to the sending actuator 11.
The sewing needle 5 positioned in this manner and the feed dog 7 whose feed amount and feed direction are determined work together to form each stitch in synchronization with the rotation of the sewing machine main shaft to form a desired stitch pattern. It is.

In addition to the above circuits, a timing control circuit 23 is provided which is an information update circuit for controlling multiple stitching, which will be described below. That is, the third
As shown in the block diagram in the figure, a timing pulse TP synchronized with the rotation of the sewing machine main shaft is supplied from the timing pulse generator 37 to the input terminal CK of the counter 38, the AND circuit 39, the OR circuit 40, and the one-shot multi-circuit 41. be done. On the other hand, the multiple stitching signal MSP generated when the changeover switch 16 is switched to multiple stitching is supplied to the OR circuit 43 and the AND circuit 39 via the inverter 42, and the operation signal representing the operation of the pattern selection device 20 is supplied to the OR circuit 43 and the AND circuit 39. PN is OR circuit 43 and OR circuit 4
0.

The counter 38 receives the supplied timing pulse.
A 2-bit counting circuit that counts TP,
Terminals D ₀ and D ₁ output the bit contents of each digit
and an input terminal RT for resetting the contents of the counter. A signal generated at the terminal _D0 representing the contents of the lower bit is supplied to an AND circuit 45 via an inverter 44, and also to an AND circuit 46 and an AND circuit 47.
A signal generated at terminal _D1 representing the contents of the upper bit is supplied to AND circuit 47 via inverter 48, and also to AND circuit 45 and AND circuit 46. The output signal of the AND circuit 46 is supplied to the reset input terminal RT of the counter 38 via the OR circuit 43.

Therefore, when the changeover switch 16 is closed and the mode is switched to multiple stitching, the counter 38
counts the timing pulse TP and outputs its output terminal D ₀
and _D1 form a ternary counter that is reset at the same time when both become "1".

The output signal of the AND circuit 47 is supplied to the latch 29 as a timing signal CP3 via a one shot multi circuit 49, and the signal CP3 is supplied as a timing signal CP2 via a one shot multi circuit 50 to a timing signal which is an output signal of the AND circuit 39. It is supplied to the OR circuit 28 together with the signal CP1. The output signal of the AND circuit 45 is supplied to the multiplexer 28 as a timing signal CP4, the output signal of the OR circuit 40 is supplied to the latch 32 as a timing signal CP5 via a one shot multi circuit 51, and the output signal of the one shot multi circuit 41 is supplied to the latch 32 as a timing signal CP5. The signal is timing signal CP6
The signal is supplied to the latch 33 as a signal. The one shot multi circuits 41 and 49 output pulse signals with a constant time width from the rising edge of the input signal, and the one shot multi circuits 50 and 51 output pulse signals with a constant time width from the falling edge of the input signal. This outputs the following. In addition, 52 is a changeover switch 16
This is a pull-down resistor that brings the input terminal of the inverter 42 to the ground potential when the inverter 42 is opened.

The operation of this embodiment will be explained below.

After the power is turned on, when a desired stitch pattern is selected in the pattern selection device 20, a pattern signal SM representing the selected pattern is supplied to the start address memory 21 and the stitch end address memory 22. The start address memory 21 generates a start address signal SIA corresponding to the pattern signal SM, and the end address memory 22 generates an end address signal SEA corresponding to the pattern signal SM. At the same time, the operation signal PN generated from the pattern selection device 20 causes the head address signal SIA to be loaded into the address counter 25.

When the changeover switch 16 is switched to normal sewing and its contact is opened, and the sewing machine start/stop push button switch 17 is operated to drive the sewing machine main shaft,
Since multiple stitching signal MSP is not generated, inverter 4
Since the counter 38 is supplied with a signal from the input port PA1 via the OR circuit 43, the counter 38 is always reset and the timing signals CP2 to CP4 are not generated, and the multiplexer 28 is placed in the state of selecting the input port PA1, and the timing pulse is
TP is supplied to the address counter 25 as a timing signal CP1 to cause the counter 25 to count. Timing signals CP5 and CP6 are generated in synchronization with the falling and rising edges of timing pulse TP and are supplied to latches 32 and 33. As a result, the address signal SD is generated from the address counter 25 in synchronization with the timing pulse TP, and the stitch position information necessary for forming the selected desired stitch pattern is sequentially generated from the stitch information memory 26. do. Needle position information of the stitch position information
SB and sending information SF are supplied to a latch 32 and a latch 33 via a multiplexer 28, and the latch 32 supplies its output signal LB to a needle swing drive circuit 34 in synchronization with the falling edge of the timing pulse TP. Latch 33 is a timing pulse
The output signal LF is sent and supplied to the drive circuit 35 in synchronization with the rise of TP. Further, the drive circuits 34 and 35 supply drive power to the needle swing actuator 10.
and the feed actuator 11 to position the sewing needle 5 and the feed adjuster that adjusts the feed amount and feed direction of the feed dog 7. The sewing needle 5 and the feed dog 7 controlled in this manner work together to form the selected desired stitch pattern.

When the last piece of stitch position information is generated, the content of the address signal SD matches the end address signal SEA, so an output signal from the comparator 27 is generated, causing the address counter 25 to reload the start address signal SIA. . Therefore, the above-described operation is repeated to repeatedly and continuously form the desired stitch pattern.

Next, when the start/stop push button switch 17 is operated with the changeover switch 16 switched to multiple stitching and the sewing machine main shaft is driven, the multiple stitching signal is
Since MSP is supplied to the inverter 42, the output signal of the inverter 42 is not generated and the timing signal CP1 is not generated. At the same time counter 38
counts the timing pulses TP and sends the output signal of each bit representing the count contents to its output terminal D ₀
and _D1 to generate timing signals CP2 to CP4 as shown in FIG. Note that the timing signals CP5 and CP6 are generated in synchronization with the falling and rising edges of the timing pulse TP, as in the case described above.

In this case, if the selected stitch pattern is the so-called German blind pattern shown in FIG. 5, a multiple (triple) stitch pattern as shown in the sewing order explanatory diagram of FIG. 6 will be formed. be done. still,
B0 to B5 represent the stitch positions, and F0 to F5 represent the cloth feed amount.

That is, when the Jarman blind pattern is selected by the pattern selection device 20 at time A in FIG. 4, the pattern signal SM corresponding to the pattern is generated, and the leading address signals SIA, Address signal SD and end address signal SEA are generated, and needle position information SB and feed information SF are also supplied to latches 32 and 33. In this case, the position of the sewing needle 5 indicated by the contents of the needle position information SB is the stitch position B0 in FIG. Further, the operation signal PN representing the pattern selection operation is sent from the timing control circuit 23 to the timing signal CP.
The signal CP5 loads the needle position information SB representing the stitch position B0 into the latch 32, and the output signal LB of the latch 32 outputs the needle swing drive control circuit 3.
4 and the swinging position of the sewing needle 5 is determined.

In this state, when the main shaft of the sewing machine is driven, the sewing needle 5 falls and stitches the stitch number (Fig. 6).
is formed, and at the same time the timing pulse TP rises. Timing signal CP3 generated at time A0 (FIG. 4) causes latch 29 to load needle position information SB representing stitch position B0. Since the timing signal CP2 generated from the falling edge of the timing signal CP3 adds 1 to the load contents of the address counter 25,
Needle position information SB representing the stitch position B1 is supplied from the stitch information memory 26 to the latch 32 via the multiplexer 28, and feed information SF representing the feed direction and feed amount F1 is supplied to the latch 33 via the multiplexer 28. Supplied. Timing signal CP that occurs simultaneously with timing signal CP3
Reference numeral 6 positions the feed adjuster by causing the latch 33 to hold the feed information SF representing the feed direction and feed amount F1, which has a large pulse width and occurs during its rise time.

As the sewing machine main shaft further rotates, the sewing needle 5 rises from the work cloth, and the work cloth is fed by the feed dog 7 which is operated in the feed direction and the feed amount F1 according to the positioned feed adjuster. At the same time, timing pulse TP falls A1 (fourth
Timing signal CP generated at the time shown in Figure)
5 is needle position information SB representing the stitch position B1.
is loaded into latch 32. Therefore, the swinging position of the stitch diagonal 5 is positioned so as to form the stitch position B1.

The timing pulse TP rises at the same time as the sewing needle 5 falls again and the stitch of the stitch number is formed.
The timing signal CP4, which is generated at the time point A2 (FIG. 4) and disappears at the rise of the next timing pulse TP (time point A4 described later), causes the multiplexer 28 to select the input ports PB1 and PB2. Latch 2 representing position B0
The output signal LSB of 9 is supplied to the latch 32 via the multiplexer 28, and the sending information
The output signal SFR of the information inversion circuit 30 representing the feed amount F1 represented by SF and the feed amount F1 in the opposite direction to the feed direction is sent to the latch 3 via the multiplexer 28.
3. The timing signal CP6 generated simultaneously with the generation of the timing signal CP4 causes the latch 33 to load the signal SFR representing the feed amount F1, so that the feed dog 7 feeds the workpiece cloth with the feed amount F1 in the feed direction. A regulator is positioned.

When the sewing needle 5 rises again from the work cloth, the work cloth is fed by the feed dog which is operated in the feed direction and feed amount F1 according to the positioned feed adjuster. A timing pulse TP falls at the same time
The timing signal CP5 generated at the time point 3 (FIG. 4) loads the output signal LSB of the latch 29 representing the stitch position B0 into the latch 32, so that the swinging position of the sewing needle 5 is positioned at the stitch position B0. be done.

The timing pulse TP rises at the same time as the sewing needle 5 falls again and the stitch of the stitch number is formed.
Since the timing signal CP4 disappears at the time of A4 (Fig. 4), the multiplexer 28 selects the input ports PA1 and PA2, and selects the needle position information SB representing the stitch position B1 and the feed direction and feed amount F1. Information SF is supplied to latches 32 and 33. timing signal CP
Timing signal CP6 generated simultaneously with the disappearance of 4
loads the above-mentioned feed information SF into the latch 33, so that the feed direction and feed amount F indicated by the information SF are
The feed adjuster is positioned such that the feed dog 7 applies a value of 1 to the work cloth.

Further, when the sewing needle 5 rises again from the work cloth, the work cloth is fed by the feed dog which is operated in the feed direction and feed amount F1 according to the positioned feed adjuster. At the same time, the timing signal CP5 generated at time A5 (FIG. 4) when the timing pulse TP falls causes the latch 32 to load the needle position information SB representing the stitch position B1, so that the swing position of the sewing needle 5 is at the stitch position. It is positioned at position B1.

Furthermore, the timing pulse TP rises at the same time as the sewing needle 5 falls and the stitch of the stitch number is formed. Similar to the time A0, this A6 (fourth
Timing signal CP generated at the time shown in Figure)
3 causes the latch 29 to load the needle position information SB representing the stitch position B1. The timing signal CP2 generated from the fall of the timing signal CP3 adds one to the contents of the address counter 25, so that the needle position status information SB representing the new stitch position B2 is sent from the stitch information memory 26 via the multiplexer 28. feed information SF representing the new feed direction and feed amount F2 is fed via multiplexer 28 to latch 33. In addition, the timing signal CP3
The timing signal CP6 generated at the same time causes the latch 33 to hold the feed information SF representing the feed direction and feed amount F2, and the feed adjuster is positioned.

The above operation from point A0 to point A6 is considered as one cycle, and a triple stitch is formed between two stitches in which the first stitch is at stitch position B0 and the second stitch is at stitch position B1. When this cycle is repeated five times and the stitches corresponding to the stitch numbers are formed, the triple stitched Jarman blind stitch shown in FIG. 5 is constructed. Furthermore, when the sewing machine continues to be driven, comparator 2 is generated by the address signal SD representing the end address of Jarman blind stitching.
Since the output signal No. 7 reloads the head address signal SIA into the address counter 25, the above-mentioned operation is repeated to continuously form triple-stitched Jarman blind stitches.

As described above, the multiple stitch sewing machine of this embodiment is configured to form multiple stitches by moving the adjacent stitch positions back and forth, so that it is possible to easily operate the switch without any skill. By using a chisel, it is possible to form a stitch pattern of multiple stitches that overlap accurately, and it is possible to improve the strength of the stitches without impairing the decorative value.

It goes without saying that what has been described above is merely one embodiment of the present invention, and the present invention should not be interpreted as being limited thereto.

For example, the number of times of multiple stitches may be triple stitches, quintuple stitches, or even an odd number of times. In this case, the counting capacity of the counter 38 of the timing control circuit 23 may be a quinary or higher odd value.

Further, the stitch pattern to which multiple stitching is applied is not limited to Jarman blind stitching, but can also be applied to other stitch patterns such as zigzag stitching, straight stitching, pattern stitching, etc.

Effects As described in detail above, the present invention enables multiple stitching in which the stitch patterns match accurately by a simple switch operation, without impairing the decorative value and commercial value of the stitch patterns. This produces an excellent effect of providing a multi-stitch sewing machine with improved seam strength.

[Brief explanation of the drawing]

FIG. 1 is an external view showing a sewing machine according to an embodiment of the present invention. FIG. 2 is a block diagram showing the control circuit of the sewing machine of FIG. 1. FIG. 3 is a block diagram showing the circuit configuration of a timing control circuit included in the control circuit of FIG. 2. FIG. 4 is a time chart illustrating the operation of the circuits shown in FIGS. 2 and 3. 5 and 6 are diagrams showing a stitch pattern of multiple stitches and an explanatory diagram showing the sewing order of the stitch pattern, showing an example of sewing by the sewing machine of FIG. 1. FIG. 5: Needle (sewing needle), 5, 7: Stitch forming mechanism (needle,
10, 11: Drive device (needle swing actuator, feed actuator), 23: Information update circuit (timing control circuit), 26: Information generation circuit (stitch information memory), 28: Information selection circuit (multiplexer) ), 29: Storage section (latch), 3
0: Arithmetic unit (information inversion circuit), 29, 30: Position inversion circuit (latch, information inversion circuit), 37: Pulse generator, SB, SF: Stitch position information (needle position information, feed information), LSB, SFR: Position reversal information (temporarily stored needle position information, feed reversal information).

Claims (1)

[Scope of Claims] 1. A stitch forming mechanism including a needle capable of reciprocating up and down, a drive device that operates to change the relative position of the needle and the work cloth, and forming a stitch pattern in a predetermined stitch pattern. an information generating circuit that can sequentially generate stitch position information for determining the formation position of each stitch; a pulse generator that generates a timing pulse in synchronization with the up and down reciprocating movement of the needle; and the timing pulse. A period during which an odd number of 3 or more occurs is defined as one cycle, and the first stitch position information regarding the first stitch, which is an arbitrary stitch in the predetermined stitch pattern, an information updating circuit for updating output information of the information generating circuit to second stitch position information regarding a second stitch following the first stitch at the beginning of each cycle; a position reversal circuit capable of generating and generating position reversal information during each cycle for returning the relative position to the first seam formation position; and a position reversal circuit responsive to a timing pulse generated at the beginning of the cycle. the updated second stitch position information, and alternately selects the position reversal information and the second stitch position information in response to each subsequently generated timing pulse within the cycle. and an information selection circuit for forming each stitch in the predetermined stitch pattern overlappingly an odd number of three or more times by operating the drive device according to the selected information. Features a multi-stitch sewing machine. 2. The stitch forming mechanism includes a needle capable of vertical reciprocating motion and lateral rocking motion, and a feeding device that applies a feeding motion to the workpiece cloth in time with the vertical reciprocating motion. The needle position information for determining the horizontal swing position and the feed information for determining the feed amount and feed direction of the feed movement applied to the work cloth are generated as the stitch position information, and the position reversal is performed. The circuit includes a storage unit that temporarily stores needle position information regarding the first stitch, and feed reversal information that represents the feed amount and feed direction from the second stitch forming position to the first stitch forming position. 2. The multi-stitch sewing machine according to claim 1, further comprising a calculation unit for calculating the needle position information and the feed reversal information which are temporarily stored as the position reversal information. 3. The information update circuit and the information selection circuit are configured such that their operations are selectively enabled or disabled, and the information generation circuit receives each of the timing pulses while both circuits are disabled. The drive device is configured to sequentially update and generate stitch position information in response to the generated stitch position information, and operate the driving device in accordance with the generated stitch position information to update each stitch position information in the predetermined stitch pattern. The multi-stitch sewing machine according to claim 1, characterized in that a single stitch is continuously formed.