JPS6020024B2 - Sewing machine seam formation data generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stitch forming data generating device for generating stitch forming data for controlling the relative position between a sewing needle of a sewing machine capable of vertically reciprocating movement and a work cloth.

Conventionally, seam formation data generators use magnetic tape,
Stitch formation data is stored in a storage medium such as perforated tape, and is stored while the storage medium is driven by a mechanical drive means in response to a readout signal generated in synchronization with the up and down reciprocating movement of the sewing needle. The data contained in the data was read out sequentially.

The continued stitch formation data is supplied as a command signal to the operating means for operating the sewing needle and work cloth feeding device, thereby forming a predetermined stitch pattern on the work cloth. It is well known that However, the data read period from when the read signal is generated until the stitch formation data is transferred to the actuating means is the period during which the mechanical drive means is driving the storage medium, that is, the period when the mechanical drive means is driving the storage medium. It is determined almost by the speed at which the sewing machine responds to the reading signal of the means, so if the sewing machine is operated at a speed higher than its maximum response speed, the stitch formation data is accurately synchronized with the up and down reciprocating movement of the sewing needle. It becomes impossible to read. The present invention has been made in view of the above drawbacks, and
An object of the present invention is to provide a novel stitch formation data generation device that can generate stitch formation data at high speed without using mechanical driving means.

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

FIG. 1 is a diagram showing the overall configuration of an electrical control circuit that controls the lateral swing movement of the sewing needle and the feed movement of the work cloth in a sewing machine. In FIG. This is a pattern selection switch group consisting of six pattern selection switches So to S5 that are closed only while the pattern code generator 2 is being applied. One of the six types of stitch patterns is selected corresponding to each of the plurality of types, for example, six types of twill patterns shown in FIGS. 5A to 5W. That is,
5A shows a straight stitch selected by the pattern selection switch So, FIG. 5B shows a zigzag stitch selected by the pattern selection switch S, and the same goes for FIGS. 5C and D.
, E and F respectively indicate a triple stitch pattern, a cross stitch pattern, a blind stitch and a German blind stitch selected by the pattern selection switches S2, S3, S4 and S5, respectively. One end of each of the pattern selection switches So to S5 is connected to a low-level potential terminal (for example, a zero potential terminal), and each other end is connected to each input terminal of an encoder 3 in a pattern code generator 2 serving as a code generating means. There is. In this encoder 3, decimal numbers 0, 1, ..., S5 are assumed for the pattern selection switches So, S, ..., S5, respectively, and any one of the pattern selection switches So to S5 is closed. When this is done, the assumed decimal number is converted into a binary code, and each bit is converted into a corresponding line L,
．． , L2, L, 3, and one-shot multi-vibrator 4 via line L4 when any one of the pattern selection switches So to S5 is closed on separately provided lines L, 4. is triggered to generate a single pulse, which is the unstable signal. The pattern code generator 2 comprises a pattern selection switch group 1, an encoder 3, a one-shot multivibrator 4, a latch 5, and a decoder 6. The encoder 3 receives bits as input via lines L, , L2, and L3, and when an unstable signal from the one-shot multi-vibrator 4 is input to its clock input terminal CK via lines L, 5. Each bit is stored as a binary code from . Further, the decoder 6 has its output terminals Do,
D,,...,D5 respectively have decimal numbers 0, 1, .
..., 5 is assumed, each bit of the binary code stored in the latch 5 is received as input via the lines -,, L22, L23 and is decimal encoded, and this decimal encoding is performed. The output terminals Do, D. ,... A logic value {1} signal is output from only one output terminal of D5, and a (0) signal is output from the other output terminal.
) signal is output. In this way,
The pattern code generator 2 has pattern selection switches So to S5.
When any one of them is closed, it is encoded in binary and becomes 3
The bit configuration is stored as a binary code in the latch 5, and when another one of the pattern selection switches So to S5 is closed, the binary code corresponding to the newly closed one is output in one shot. It is re-stored in synchronization with the unstable signal of the multi-viprator 4, and the currently stored binary code is output from the output terminal Do of the decoder 6.
Only one predetermined bit from D, . Reference numeral 7 denotes a pulse generator that generates a timing pulse in synchronization with the vertical and reciprocating movement of the sewing needle, and its output is used by a swing amplitude control circuit 8 that controls the horizontal swing movement of the sewing needle and a feed motion of the workpiece cloth. A timing pulse BCP for amplitude control and a timing pulse FCP for feed control, which are 180 degrees out of phase with each other, are distributed and supplied to a feed control circuit 9 that performs control via a pulse distributor 11 comprising an inverter 0. .

When the sewing machine is in operation, the pulse generator 7 is connected to the fourth pulse generator.
As shown in the figure, a timing pulse BCP for amplitude control is generated in synchronization with the vertical movement of the sewing needle, and the phase of this timing pulse BCP is inverted via an inverter 10 for feeding control with a phase shift of 180 degrees. The timing pulse is output as a timing pulse FCP. In this FIG. 4, 12 represents the vertical movement locus of the tip of the sewing needle when 13, which is shown as a straight line, is the upper surface of the sewing slope of the sewing machine, and 14 represents the trajectory of the vertical movement of the sewing needle tip when the feed dog for feeding the work cloth protrudes upward from the upper surface 13 of the throat plate. It shows the period during which feed is applied to the processed cloth. Now, the amplitude control circuit 8 will be described below. That is, 15
is the amplitude control timing pulse B from the pulse generator 7
A 3-bit stitch count counter is connected to receive CP as an input via the pulse distributor 11, and the pulse CP2 generated at the falling edge of the amplitude control timing pulse 8CP (Fig. (see) are counted and the counted contents progress sequentially. Reference numeral 16 designates a relatively short 6-bit retrieval counter serving as a stitch number counting means connected to receive as input the oscillation output from the oscillator 17 set to the oscillation period, and in response to the oscillation output. The count contents gradually progress.

Reference numeral 18 denotes an amplitude control memory device made of a semiconductor, and as shown in the "Address" column in FIG. "Address group" in Figure 2, which has 32 addresses as one group
It is composed of seven address groups (represented by 3-bit codes) as shown in the column, and the multiple types of stitch patterns (shown as A to F in Figure 5) are attached to the specified locations in each address house. ) A 6-bit pattern code, which will be described later, is stored.

In addition, the blank code content in Figure 2 is “00000
0". The storage device 18 is provided to receive the count contents of the stitch count counter 15 and the count of the other 5 bits excluding the most significant bit of the search counter 16 as input for each content. One address group among the plurality of address groups is sequentially designated by the count contents from the search counter 15, and the 32 addresses in the designated addresses are gradually advanced at high speed according to the count contents from the search counter 16. The stored contents thus retrieved are sequentially output as read outputs from the output terminals Do to D5. Further, the most significant bit (highest bit) of the search counter 16 is connected to one input terminal of the OR circuit 19. The other input terminal of the OR circuit 19 is connected to the output side of the one-shot multi-byte circuit 4, and the output terminal of the OR circuit 19 is connected to the reset terminal RT of the stitch count counter 15. Therefore, when the count of the search counter 16 progresses and a carry is carried out from the fifth bit (crossing bit) to the most significant bit, or when any one of the pattern selection switches So to S5 is closed. At the point in time when the one-shot multi-noise plater 4 generates an unstable signal, the stitch count counter 15 is reset. Reference numeral 20 denotes a comparison circuit as comparison means consisting of six AND circuits 21 to 26, and one input terminal of these six AND circuits 21 to 26 is connected to lines Lo, L3, . . . , L35, respectively.
The outputs from the output terminals Do, D5 of the storage device 18 are connected through the lines Lo and L, respectively.
4. , . . . are connected to receive the outputs from the output terminals Do to D5 of the decoder 6 of the pattern code generator 2 through the L street, and therefore the 6-bit code read from the storage device 18. The corresponding bits of the 6-bit pattern code outputted from the pattern code generator 2 are input to each of the AND circuits 21 to 26 for each pair of bits.
When both inputs become 0} signals in any one of 26 and match, the AND circuit outputs a '1' signal as a match signal.

27 is a multi-input OR circuit connected to receive the output from the comparison circuit 20 as an input; 28 is the comparison circuit 20
This is a one-shot multi-vibrator that is triggered by receiving the {1} signal (coincidence signal) from the multi-input OR circuit 27 as an input, thereby generating an unstable signal as a latch signal.

Reference numeral 29 denotes a 5-bit latch as a latch means connected to receive the count contents of the search counter 16 as an input, and an unstable signal (latch) from the one-shot multi-viprator 28 is connected to its clock input terminal CK. signal)
is entered via line L6, the search counter 16
For example, code contents such as those shown in the "amplitude information tree" in FIG. 6 are stored and held as oscillation amplitude information which is stitch forming data.

This is a DA converter (digital-to-analog converter) that receives as input the oscillation amplitude information stored in the memory of the 3-way Maratsu 29, and converts the oscillation amplitude information received as input into an amount according to the code content. It is configured to convert an analog signal, for example, into a DC voltage E, and output it.

Further, the reset terminal RT of the search counter 16 is connected to receive the output from the one-shot multiviprator 28. Reference numeral 31 denotes a comparator for analog quantity comparison, and a DC voltage E is supplied from the D-A converter 30 in the oscillation amplitude information generating device having the above configuration to its positive input terminal.
, and a feedback voltage E2 from a potentiometer 32, which will be described later, is applied to its negative input terminal.

The comparator 31 compares the applied DC voltage E and the feedback voltage E2, and the difference voltage is amplified by the amplitude control driver 33 and supplied to the amplitude control actuator 34. This amplitude control actuator 3
Reference numeral 4 corresponds to a DC type reversible linear motor, which is configured to control the lowering position of the sewing needle in accordance with the supplied differential voltage. Further, the potentiometer 32 detects the actual position of the sewing needle by the amplitude control actuator 34, converts it into a feedback voltage E2, and converts it into a feedback voltage E2, which is connected to the comparator 3 as described above.
This is given to the minor input terminal of 1. Next, the feed control circuit 9 will be described below.Since the circuit configuration of the feed control circuit 9 is the same as that of the amplitude control circuit 8 described above, a brief explanation will be provided.

Reference numeral 35 denotes a stitch count counter having the same configuration as the stitch count counter 15 connected to receive the feed control timing pulse FCP from the pulse generator 7 via the pulse distributor 11 as an input; Pulse CP3 (see FIG. 4) generated at the falling edge of pulse FCP is counted, and the count progresses sequentially.

36 is a search counter having the same configuration as the search counter 16 and connected to receive the oscillation output from the oscillator 17 as an input; A storage device for feeding control that has the same configuration as the storage device 18 and is provided to receive the counting contents of the other 5 bits excluding the upper bit as input separately,
The stored contents of this storage device 37 are as shown in FIG.

In addition, the code content of the blank field in the third column is "000000"
It is. 38 is an OR circuit, one input terminal of which is connected to the most significant bit of the search counter 36, the other input terminal of which is connected to the output side of the one-shot multiviprator 4; IJ of stitch count counter 35
Connected to set terminal RT.

Reference numeral 39 denotes a comparison circuit as comparison means consisting of six AND circuits 40 to 45, and one input terminal of these six AND circuits 40 to 45 is connected to lines o, m, . . . , respectively.
, L yellow, from the output terminals Do to D5 of the storage device 37, and the other input terminal receives the outputs from the output terminals Do to P5 of the decoder 6 via the lines L side L small..., L5, respectively. Connected to receive output.

46 is a multi-input OR circuit connected to receive the output from the comparator circuit 39 as an input; 47 is a multi-input OR circuit connected to receive the output from the comparator circuit 39;
This is a one-shot multiviprator which is triggered by receiving the '1: signal (coincidence signal) from 9 as an input via the multi-input OR path 46, thereby generating an unstable signal which is a latch signal.

Reference numeral 48 denotes a latch having the same structure as the latch 29, which is connected to receive the counted contents of the stitch count counter 36 as an input, and has a clock input terminal CK connected to the one-shot multi-noise brake 47. When the unstable signal is input via the line L, 7, the search counter 3
The count contents of 6 are stored and held as a 5-bit code, such as the code contents shown in each "feed information" column in FIG. 6, as feed information which is stitch forming data.

49 is a D-A converter connected to receive the sending information stored in the latch 48 as input, and converts the sending information received as input into an analog signal of an amount corresponding to the code content, for example, DC voltage E3. This is a configuration that converts and outputs.

Further, the reset terminal of the search counter 36 is connected to the output side of the one-shot multi-vibrator 47. 50 is a comparator having the same configuration as the comparator 31, and the ○-A converter 4 in the sending information generating device having the above configuration.
DC voltage E3 is applied from 9 to its positive input terminal,
Moreover, a feedback voltage E4 from a potentiometer 51, which will be described later, is applied to its negative input terminal.

The comparator 50 compares the applied DC voltage E3 and the feedback voltage E4, and the difference voltage is amplified by the feed control driver 52 and supplied to the feed control actuator 53. This feed control actuator 5
Reference numeral 3 corresponds to a DC type reversible linear motor, which controls the movement of the feed teeth for feeding the work cloth in accordance with the supplied differential voltage. Further, the potentiometer 51 detects the actual position of the adjusting device including the feed dog operated by the feed control actuator 53 and converts it into a feedback voltage E.
4 and is applied to the negative input terminal of the comparator 50 as described above. Next, the operation of the above configuration will be explained.

Suppose now that the pattern selection switch S3 is closed in order to form, for example, the cross-cut pattern shown in FIG. 5D. The principle of formation of this cross stitch pattern is that the numbers (0) corresponding to the 0th stitch to the 5th stitch of the sewing needle attached to the stitch pattern in Figure 5D.
When one unit is the formation of stitches in this order from the number to the side number (the numbers 0 to 5 correspond to the number of stitches in Figure 6), this means that this is repeated for multiple units, and this unit In unit pattern formation, as is clear from FIG. 6D, which shows these control contents, the lowering position of the sewing needle to form each stitch from number (0) to '5} is 0. Needle position coordinates (11) corresponding to the 5th stitch to 5th stitch,
(2), (11), (20), (29), (20) (these correspond to each coordinate point in FIG. 5). or,
In the feed increment (feed amount and direction of the work cloth), the formation of stitch (0) is performed successively after the formation of stitch {5}; ) is given the feed increment (-5) for the stitch number, and the feed increment is the above needle position coordinates (11), (2), (11), (20).
, (29), (20), respectively, the feed increment (-5)
, (15), (15), (15), (15), (15)
By giving such needle position coordinates and feed increments, the cross-cut pattern shown in FIG. 5D is formed. The specific effects of this control will be described below.
That is, when the pattern selection switch S3 is closed, the assumed decimal number {3}' is converted into a binary code by the encoder 3 and stored in the latch 5, and the stored contents are transferred from the latch 5 to the lines L2, . It is sent to the decoder 6 via L22 and L, where it is again converted into a decimal number {3}', and a logic value {1} signal is output from the output terminal D3 of the decoder 6, which assumes a decimal number (3'). and other output terminals Do, D
1, D2, D4, and D5 output logic value (0) signals, resulting in output terminal D. A pattern code with code content "000100" is output from lines L4o to L45 from D5 to D5. On the other hand, stitch count counters 15 and 35
is reset by an unstable signal from the one-shot multiviprator 4 upon closing of the pattern selection switch S3, and the count content is "000". Therefore, if the sewing machine is to be started, for example, from the upper layer of needles shown at timing To in FIG. The address group "000" in the plurality of address groups of the device 18 is designated, and in addition to this, the search counter 16 responds to the oscillation output from the oscillator 17, and its counting contents gradually advance at high speed. The addresses within the address "000" are sequentially searched at high speed, and the stored contents of each address (see FIG. 2) are sequentially output from the output terminals Do to D5 of the storage device 18 as a 6-bit code. Then, from the address “01011”, the code content “0”
When the pattern code 00100J is read out, the tl' signal is supplied from the output terminal D3 of the storage device 18 to one input terminal of the AND circuit 24 via the line -3, and on the other hand, the tl' signal is supplied to one input terminal of the AND circuit 24.

The code content “000” from the decoder 6 is sent from L45 to L45.
Based on the fact that the pattern code "100" is always output, the line L43 is also connected to the other input terminal of the AND circuit 24.
Since the '1} signal is supplied through the AND circuit 24, the {1) signal, which is a coincidence signal, is outputted from the AND circuit 24. This coincidence signal causes the one-shot multi-vibrator 28
is triggered and the unstable signal closes latch 29. CK input terminal CK and reset terminal RT' of the search counter 16
Therefore, the coincidence signal is input to the AND circuit 24.
The count content of the retrieval counter 16 at the time of output from the retrieval counter 16 is stored in the latch 29 as swing amplitude information (stitch formation data), and the retrieval counter 16 is reset. The DA converter 30 receiving this amplitude information as input generates a DC voltage E of a specific value based on the code content, and applies this to the plus input terminal of the comparator 31. This comparator 31 is connected to this DC voltage E.
, and the feedback voltage E2 from the potentiometer 32, and the difference voltage is amplified by the amplitude control driver 33 and supplied to the amplitude control actuator 34. This results in
The movement of the sewing needle is controlled so that the lowered position is at the needle position coordinate (11), and the 0th stitch is formed at the needle position coordinate (11). On the other hand, as described above, the count content of the stitch number counter 35 in the feed control circuit 9 at timing To is "000", but this stitch number counter 35 is
As shown in the figure, at timing T immediately after that, CP3 generated at the falling edge of the feed control timing pulse FCP input from the pulse generator 7 via the pulse distributor 11 is counted, and the count content is "001". Therefore, the storage device 37 receives the count contents of the stitch count counter 35 as input, and thereby the address "001" in the address group of the plurality of address groups of the storage device 37 shown in FIG. In addition to the search counter 36, the oscillator 17
In response to the oscillation output from , the count contents gradually advance at high speed, and the addresses in the address group "001" are searched sequentially from "000000" at high speed, and the stored contents of each address are transferred to the output terminal Do of the storage device 37. The 6-bit code is sequentially output from D5 to D5. Then, when the pattern code with the code content "001100" is read from the address "11iol", it is sent to one input terminal of the AND circuit 43 via the line L3.
1} signal is supplied, and on the other hand, based on the fact that the pattern code with the code content "000100" is constantly output from the lines Lo to Lpuco datar 6, the other input terminal of the asodo circuit 43 is also supplied via the line L3. Since the {1} signal is supplied, it is a match signal from this AND circuit 43.
1} A signal is output. This coincidence signal triggers the one-shot multi-bypass controller 47, and the unstable signal (latch signal) is sent to the clock input terminal CK of the latch 48.
and is input to the reset terminal RT of the search counter 35, and therefore, the count contents of the search counter 36 at the time when the coincidence signal is output from the AND circuit 43, i.e., "11101".
'' is stored as feed information (stitch formation data) by the latch 481, and the search counter 36 is reset.
The code content "11101" of this feed information means that the feed increment for forming the first stitch is (15), and the D-A converter 49 that receives this feed information as input uses the code A DC voltage E3 having a specific value based on the content "11101" is generated and applied to the plus input terminal of the comparator 50. The comparator 50 compares the DC voltage E3 with the feedback voltage E4 from the potentiometer 51, and the difference voltage is amplified by the feed control driver 52 and supplied to the feed control actuator 53. As a result, the movement of the feed dog for feeding the work cloth is controlled, and the feed dog is 14 in Fig. 4.
During the period indicated by , that is, the period when the 0th stitch is completed and the sewing needle reaches approximately the needle top dead center (between timings T3 and T4)
Then, the feed increment (15) for forming the next first stitch is applied to the work cloth. This cloth feeding period 14
At the timing L when the sewing needle reaches a position above the throat plate upper surface 13, the amplitude control timing pulse 8
The pulse CP2 generated at the falling edge of CP is detected by the stitch count counter 15.
counts, changes the count to "001", and specifies the address group "001" of the storage device 18. At the same time, the addresses in the address group "001" are searched by the search counter 16 starting from the address group "00000J," and
When the pattern code with the code content "000100" is read from "00010", the output terminal ○3 of memory device 18 is read out.
The Q) signal is supplied from the output terminal D2 of the decoder 6 to one input terminal of the AND circuit 24 through the line L3, and the (1- signal is combined) from the output terminal D2 of the decoder 6 through the line L3. A '1} signal, which is a coincidence signal, is outputted from 24. This coincidence signal triggers the one-shot multivibrator 28 to generate an unstable signal, which is a latch signal, and accordingly, the coincidence signal is output from the band circuit 24. The count content at the time when the count is “00010”
is stored in the latch 29 as amplitude information, and the search counter 16 is reset. Then, the D-A converter that receives this amplitude information as input generates a DC voltage E, with a specific value based on the code content, and applies it to the plus input terminal of the comparator 31. 31 compares the DC voltage E and the feedback voltage E2 from the potentiometer 32, and the difference voltage is amplified by the amplitude control driver 33 and supplied to the amplitude control actuator 34. As a result, the lowering position of the sewing needle is adjusted. The movement is controlled so that the needle position coordinates are 2, and the needle position coordinates are 1 during the cloth feeding period 14 mentioned above.
After the feed increment (15) for forming a stitch is applied to the fabric to be processed, the first stitch is formed at the position value of the needle position coordinate t2}. Then, in the same manner as described above, the count contents of the stitch number counters 15 and 35 advance to "010" by the amplitude control timing pulse BCP and the feed control timing pulse FCP, respectively, and the address groups of the storage devices 8 and 37 are read. "010" is designated, and this address group is checked by the search counters 16 and 36, respectively, and the second stitch is formed based on the amplitude information and feed information obtained thereby. After forming the second stitch, the feed control timing pulse FCP specifies the address group "011" in the storage device 37 of the feed control circuit 9, and this address group "011" is specified. "0IL is searched by the search counter 36, but there is no pattern code "000100" corresponding to the cross stitch pattern in the address group "011", so the search counter 36 searches up to the address "11111". After that, the most significant bit is carried over and the count content is changed to "100000". Then, based on the fact that the most significant bit of the search counter is input to the reset terminal RT of the stitch count counter 35 via the OR circuit 38, the stitch count counter 35 is reset and the address group "000" is designated. Then, this address group "000" is subsequently searched by the search counter 36. Therefore, from now on, the addresses "000", "001", and "010" of the storage device 35 are repeatedly designated in sequence by the feed control timing pulse FCP, and as a result, the 0th stitch, the 3rd stitch, the 1st stitch, and the 4th stitch are sequentially specified.
The stitch information and the feed information for the second and fifth stitches are the same for both husband and wife. On the other hand, after forming the fifth stitch, the amplitude control timing pulse BCP specifies the address group "110" in the storage device 18 of the amplitude control circuit 8, and this address group "110" is searched by the search counter 16. However, the pattern code "000100" corresponding to the cross stitch pattern does not exist in the address group "110", so the stitch count counter 16
searches up to the address "11111" and then increments the count and changes the content of the count to "100000". Then, based on the fact that the upper bit of the search counter 16 is input to the reset terminal RT of the stitch count counter 15 via the OR circuit 19, the stitch count counter 15 is reset and the address group "000" is reset. specified, and this address group “000
” will be searched by the search counter 16. Therefore, from now on, the addresses of the storage device 15 are repeatedly designated in sequence from "000" to "110" by the amplitude control timing pulse BCP. In this way, the storage device 1 is sequentially designated by the pattern code activated by the pattern selection switch S3, the amplitude control timing pulse BCP, and the feed control timing pulse FCP.
The pattern codes successively output from address groups 8 and 37 are compared by comparison circuits 20 and 39, respectively, and when they match, the "amplitude information" column and "feeding information" in FIG. 6D are displayed.
A pair of swing amplitude information and feed information of the information group shown in the column are output from the swing amplitude control circuit 8 and the feed control circuit 9, so that each stitch of the cross stitch pattern is changed from the 0th stitch. 5
It is formed according to the information content up to the stitch. By repeating the designation of the addresses of the memory bags 18 and 37, the same lattice pattern is repeatedly formed in succession. In addition, Fig. 5 A, B, C, E
, F' are also the same control operations for other types of stitch patterns, so their explanations will be omitted. According to the above embodiment, a multi-value group, for example, six address groups "000", "001", .
. . , storage devices 18 and 3 storing pattern codes corresponding to six types of stitch patterns at predetermined locations "101".
7, and each address group of the storage devices 18 and 37 is routinely counted by a stitch count counter 15 whose counting proceeds according to the amplitude control timing pulse BCP and a stitch count counter 35 whose counting proceeds according to the feed control timing pulse FCP. At the same time, each designated address Sakai sheep is searched at high speed by the search counters 16 and 36, and each pattern code corresponding to the customer is read out separately from the memory, and the read pattern code and the pattern selection switch group 1 are Comparators 20 and 39 compare the pattern code validated by
} In response to the match signal, the on-shot multi-viprator 28 and 47 generates an unstable signal (latch signal), and the latch signal causes the search counter 16 and the 36 are stored and held in the latches 29 and 48, respectively, and the counts held in the latches 29 and 48 are used as stitch forming data for changing the relative position between the sewing needle and the work cloth. This is amplitude information and sending information.

Therefore, it is convenient to be able to reliably output stitch formation data for forming a plurality of types of stitch patterns. In particular, according to this embodiment, the storage devices 18 and 37 are made of semiconductors. Therefore, the stored contents can be read quickly from the storage devices 18 and 37, and the seam forming speed of the sewing machine is faster than when conventional storage devices such as magnetic tape or perforated tape are used. can be done quickly, and the overall size can be reduced. Note that the present invention is not limited to the above-mentioned types of stitch patterns, and can be applied to the formation of other types of stitch patterns in the same manner as described above. Although it is assumed that six stitches are formed from the fifth stitch to the fifth stitch, it goes without saying that the number of such stitches can be arbitrary.

As described above, according to the present invention, the relative position of the sewing needle capable of vertical reciprocating movement and the work cloth is changed in synchronization with the vertical reciprocating movement, and a predetermined stitch pattern is applied to the work cloth. The sewing machine that forms stitches can quickly and reliably generate stitch formation data for forming stitch patterns, and can also select one stitch pattern among multiple types of stitch patterns according to the operator's pattern selection operation. It is possible to provide a stitch forming data generating device for a sewing machine that can easily generate stitch forming data for forming stitches.

[Brief explanation of drawings]

The drawings relate to one embodiment of the present invention, and FIG. 1 is a block diagram of an electrical control circuit that controls the lateral swing motion of a sewing needle and the feed motion of a work cloth in a sewing machine, and FIG.
3 and 3 are diagrams showing the storage contents of different storage devices, FIG. 4 is a time chart for explaining the operation of the embodiment, FIG. 5 is a diagram showing different types of stitch patterns, and FIG. FIG. 2 is a diagram showing control details for each stitch pattern. In the drawing, 1 is a group of pattern selection switches, 2 is a code generator (
7 is a pulse generator, 8 is an oscillation amplitude control circuit, 9 is a feed control circuit, 11 is a pulse distributor, BC
P is a timing pulse for amplitude control, FCP is a timing pulse for feed control, 15 is a stitch count counter (stitch count counting means)
, 16 is a search counter (search counting means), 17 is an oscillator,
18 is a storage device, a two-way comparison circuit (comparison means), 28 is a one-shot multi-by-layer circuit, 29 is a latch (latch means), 30 is a D-A converter, 31 is a comparator, 32 is a potentiometer, and 34 is a amplitude control actuator, 3
5 is a stitch count counter, 36 is a search counter, 37 is a storage device,
39 is a comparison circuit (comparison means), 47 is a one-shot multivibrator, 48 is a latch, 49 is a D-A converter,
50' is a comparator, 51 is a potentiometer, and 53 is a feed control actuator. Figure 4 Figure 1 Figure 5 Figure 2 Figure S Figure 6 (A) Figure 6 (B) Figure 6 (C) Figure 6 (D) Figure 6 (E) Figure 6 (F )

Claims (1)

[Claims] 1. The relative position of a sewing needle capable of vertical reciprocating motion and the work cloth is changed in synchronization with the vertical reciprocating motion, and one of a plurality of predetermined stitch patterns is selected. A sewing machine for forming stitches on the processed cloth includes a plurality of address groups each consisting of a large number of different addresses, and stores a pattern code corresponding to each of the plurality of types of stitch patterns at a predetermined location in each address group. a storage device, a pattern selection switch for selecting one stitch pattern among the plurality of types of stitch patterns, and a pattern selection switch for generating a pattern code corresponding to the stitch pattern selected by the pattern selection switch. code generating means; a pulse generator for generating a timing pulse in synchronization with the vertical reciprocating motion; and a pulse generator for sequentially specifying one address group among the plurality of address groups in response to the timing pulse. and counting contents in order to search for a predetermined location where a pattern code corresponding to the stitch pattern selected by the pattern selection switch is stored within the address specified by the stitch number counting device. a retrieval counting means which gradually advances at a high speed; a latch means into which the count contents of the retrieval counting means are input; and a pattern code read from the storage device by the two counting means and a pattern output from the code generation means. and a comparison means for generating a match signal when both pattern codes match; and a comparison means for generating a match signal when both pattern codes match; means for holding count contents, and the count contents held by the latch means are used as stitch formation data for changing the relative position between the sewing needle and the work cloth. Stitch formation data generator for sewing machines. 2. The stitch forming data generating device for a sewing machine according to claim 1, wherein the retrieval counting means is reset in response to the latch signal. 3. Stitch formation data generation for a sewing machine according to claim 1, wherein the reset terminal of the stitch number counting means is connected to the output terminal of the highest number of the search counting means. Device.