JPS6043142B2 - sewing machine - Google Patents

Description

[Detailed Description of the Invention] 7 The present invention provides a sewing machine capable of forming a wide variety of stitch patterns, particularly a sewing machine configured to be able to move within a certain range in order to form a predetermined stitch pattern. The present invention relates to a sewing machine in which a stitch forming device or its control device is controlled by stitch forming information sequentially obtained in connection with reading out pattern code signals stored in a storage device.

Stitch data is stored in a static memory that has no moving parts,
As an example of a sewing machine that positions a seam forming device according to the seam data, there has been a
There are those disclosed in Japanese Patent Application No. 52-49158 and Japanese Unexamined Patent Publication No. 52-49158.

In the sewing machines described in these publications, multiple solenoids and a mechanical addition mechanism are used as drive devices for positioning the seam forming device, but sewing machines that employ such drive devices It is actually extremely difficult to realize this due to structural problems and other reasons, and the only sewing machine equipped with a practical drive device is, for example, the Japanese Patent Laid-Open No. 5
There is one disclosed in Publication No. 0-101161. In the sewing machine described in this publication, a linear actuator is used as a drive device for positioning the seam forming device, and the amount of electric power applied when the actuator is started for positioning the seam forming device is It was determined by the value of eye data. Therefore, in order to ensure high-speed positioning operation of the seam forming device, significant improvements are needed to reduce the inertia of the seam forming device and actuator, which is one of the causes of increasing manufacturing costs. Ta. The present invention has been made in view of the above circumstances, and its object is to initially drive the drive device based on a direction signal regardless of the information stored and held in the holding means, that is, the stitch data, and then to The drive device is controlled by the information stored in it! At the same time, a predetermined amount of starting power determined by the direction signal is applied to the driving device for each stitch so that the starting speed of the driving device is set regardless of stitch data, Therefore, it is an object of the present invention to provide a sewing machine that can perform high-speed positioning of a seam forming device without significantly improving the seam forming device, drive device, etc.

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 oscillating movement of the sewing needle and the feed movement of the work cloth in a sewing machine.
For example, six pattern selection switches S are closed only while applying pressure with fingers. This is a pattern selection device consisting of a pattern selection switch S5 and a pattern selection switch S5. S5 to S5 correspond to a plurality of types, for example, six types of stitch patterns shown in FIGS. 4(4) to 4(F), and are for selecting one of these six types of stitch patterns. That is, FIG. 4 (4) shows the pattern selection switch S. Indicates the straight stitch selected by
FIG. 4(B) shows the zigzag stitch selected by the pattern selection switch S1, and the same goes for FIG. 4(C), 0))
, (E) and (F) are pattern selection switches S2 and S3, respectively.
, a triple stitch pattern, a cross stitch pattern, a double blind stitch, and a jarman blind stitch selected by S drawing S5 are shown, respectively. Each pattern selection switch S above. ~ S5
One end 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 code signal generating device 2 serving as a code signal generating means. This encoder 3 is a pattern selection switch S. , Sl
,...■ are assumed to be decimal numbers 0, 1,...5, respectively, and the pattern selection switch S. When any one of S5 to S5 is closed, the decimal number assumed for this is converted into a binary code, and each bit of that a is converted into a line Lll, Ll corresponding to each bit. , Ll3, and
A pattern selection switch S is provided on a separate line Ll4. No4
55 is closed, a pulse SPl that falls from a logic value (1) signal to a (1 signal) is output via the line Ll4, and at the fall of this pulse SPl, the monostable multivibrator 4 is triggered to generate a single pulse as an unstable signal.The code signal generator 2 is composed of a monostable multivibrator 4 and a latch 5, and the latch 5 is configured to generate a single pulse that is an unstable signal. The corresponding bits are received as inputs from the encoder 3 via the lines Lll, Ll2, and Li3, and the moment when the astable signal from the monostable multivibrator 4 is input to the clock input terminal CK via the line Ll5. In this way, each bit from the encoder 3 is stored as a 3-bit pattern code signal.In this way, when any one of the pattern selection switches SO to S5 is closed, the code signal generator 2 It is encoded in binary and stored in the latch 5 as a 3-bit pattern code signal, and then is stored in the latch 5.When the other one of the pattern selection switches S to S5 is closed, the signal corresponding to the newly closed one is The pattern code signal is re-stored in synchronization with the non-stable signal of the monostable multivibrator 4, and the pattern code signal currently stored is stored on the bit-corresponding line L,
1, L22, and L23. 6
Is this a sewing needle that moves vertically and reciprocally and oscillates in the horizontal direction, and a feed dog that applies feeding motion to the work cloth in synchronization with the vertically reciprocating motion of the sewing needle? This is a pulse signal generator that generates a timing pulse signal temporally related to the stitch forming operation by the stitch forming device consisting of the A timing pulse phantom ℃P for amplitude control, which is a timing pulse signal, is generated.
At the same time, this timing pulse phantom °CP is phase-inverted by an inverter 7 and outputted as a timing pulse FCP for feed control that is out of phase by 180 degrees.

In FIG. 9, 8 represents the vertical movement locus of the tip of the sewing needle when 9 shown by a straight line is the upper surface of the throat plate of the sewing machine, and 10 represents the feed dog for feeding the work cloth that protrudes upward from the upper surface 9 of the throat plate. It shows the period during which feed is applied to the processed cloth. Now, 11
is an oscillation amplitude control circuit for controlling the lateral oscillation movement of the sewing needle, and will not be described below. That is, 12 is connected to receive the timing pulse BCP from the pulse signal generator 6 as an input via the line L16.
This is a counting device that is a bit-structured counting means, and is configured to count the pulse CPl (see Fig. 9) that occurs at the rising edge of the timing pulse CP, and the counting contents are progressive, and the counting contents are divided into three bits. Line I-. 4. , L0. 13 is an OR circuit whose one input terminal is connected to receive the unstable signal from the monostable multivibrator 4 via line Ll5, and whose output terminal is connected to the reset terminal RT of the counting device 12. There is.

Therefore, the counting device 12 is the pattern selection switch S. ~S
5 is closed and the monostable multivibrator 4 generates an unstable signal, the monostable multivibrator 4 is reset. 14 indicates the counting contents of the counting device 12 on lines L24 and L2.
5, a decoder connected to receive as an input via L, its output terminal D;

, Dl, . . . 8 are assumed to be decimal numbers 0, 1, . Said output terminal D, where a base number is assumed. A logic value (1) signal is output from one output terminal of D5 to D5, and a logic value (1 signal) is output from the other output terminals. 15 is a memory device for amplitude control made of a semiconductor. As shown in the 1st address column in Figure 2, this consists of 32 different addresses expressed in 5-bit codes and these 32 addresses.
Address group 1 in Figure 2, where each address is one group. It consists of six address groups (represented by 3-bit codes) as shown in , and each address group (4)00), (001), .
..., (101) respectively correspond to the six types of stitch patterns (shown as A to F in Fig. 4), and one stitch corresponding to the address group is placed at a predetermined address in each address group. A 6-bit stitch forming order code signal representing the order of forming each stitch in the pattern is stored.

In addition, the blank code content in Figure 2 is ROOOOOO.
This is O.J. Reference numeral 16 denotes an A-D converter which is a means for converting an analog position signal outputted from a potentiometer 17, which is a position detection device to be described later, into a digital position signal and effectively applying it to the storage device 15. The A-D converter 16 receives the position signal of the analog quantity and converts it into numerical values (0), (1), (2), etc. according to a certain reference quantity.
(31), and also convert these numbers (0) to (31
) is output to the line group LA as a digital position signal expressed in a 5-bit binary code.

The storage device 15 stores the pattern code signal output from the code signal generator 2 and the digital position signal output from the A-D converter 16 on lines 1-21 and L, respectively.
22. and a line group LA, and are specified by the pattern code signal from the code signal generator 2, and are sequentially designated by the pattern code signal from the code signal generator 2. 32 addresses in the address group are A-
The digital position signal from the D converter 15 is used to progressively search, and the memory content thus searched is sent to its output terminal D. The signals are sequentially output from D5 to D5. Reference numeral 18 denotes a comparison device which is a comparison means for generating a coincidence signal 7, and this includes six AND circuits 19 to 24 and a multi-input OR circuit 25.
One input terminal of each of these six AND circuits 19 to 24 is connected to the lines L3O, l-Jl, . . .
Output terminal D of storage device 15 via I-35.

a decoder 14 which receives outputs from F to D5, and whose other input terminals decimal encode the count contents of the counting device 12 via lines L4O, L4l, . . . , L45;
output terminal D. 75 is connected to receive the output from P5.

Further, the output terminals of the AND circuits 19 to 24 are individually connected to the input terminals of a multi-input OR circuit 25. Therefore, the stored contents and code 14 are read from the storage device 15 and are made up of a 6-bit code including a stitch formation order code signal.
Corresponding bits of the 6-bit code signal outputted from the 6-bit code signal are input to each AND circuit 19 to 24 for each pair of corresponding bits, and one of the AND circuits 19 to 24 inputs both inputs. When both signals become (1) signals and match, the AND circuit outputs a match signal consisting of the (1) signal, which is sent to the multi-input OR circuit 25.
is output from. 26 is a falling trigger type monostable multivibrator connected to receive the coincidence signal from the comparator 18 via the inverter 27, and when the input signal thereof falls, in other words, the coincidence signal rises. When triggered, it outputs an unstable signal on line Ll7.

Reference numeral 28 denotes a direction signal generating device which is a direction signal generating means for amplitude control, which includes a direction storage device 28a, and the direction storage device 28a, as shown in the column 1 in FIG. Six different addresses corresponding to the output 3-bit stitch count code and these six
A group of 6 addresses corresponds to the 3-bit pattern code signal output from the latch 5, as shown in the 1st address group column in FIG. 5. A direction signal, which will be described later, is stored in a total of 36 addresses.

In addition, in FIG. 5, an address written as RO (1) means that either one of the (1 signal and (1) signal) is stored as a direction signal. Such a direction storage device 28a is connected to receive the output from the latch 5, that is, the 3-bit pattern code signal via lines L2l, L22, l-23, and receives the response of the timing pulse phantom P3 from the counting device 12. The 3-bit stitch count code outputted from the line L24, L25,
L6, and one of the six address groups is designated by the pattern code signal, and one of the six addresses in the designated address group is designated by the pattern code signal. The location No. 4 is searched by the above-mentioned stitch number code, and the direction signal which is the stored content thus searched is outputted from the output terminal D. Reference numeral 29 denotes a multiplexer as a first supply means, one input terminal A of which receives the direction signal output from the direction signal generator 28, and the other input terminal B receives the pattern selection operation from the encoder 3. The falling pulse SPl output at the time is line Ll.
4, and is connected to its gate terminal G so that the falling pulse SP1 is inputted via the delay circuit 30 and line Ll8.

This multiplexer 29 has (1) at its gate terminal G.
When the signal is applied, the input terminal A is enabled, and when the ω signal is applied, the input terminal B is enabled, and the input from the enabled input terminal is allowed to pass through. is configured to output as a direction signal from output terminal C. By the way, line Ll4 and line Li
As can be understood from FIG. 10 showing the waveforms of each signal j of 8, the pattern selection switch S. Timing T is any one of S5 to S5. - When the pulse SPl is closed during the period T2 and the encoder 3 outputs a falling pulse SPl to the line Ll4, this pulse SPl is at timing T. 〜〜At T2, it is applied to the input terminal B of the multiplexer 29, and
After a delay of delay time Td of the delay circuit 30, the falling pulse SP1 is applied to the gate terminal G of the multiplexer 29 at timings T1 to T3. Therefore, based on the configuration of the multiplexer 29 described above, the logical value (
0) is output, and at timings T2 to T3.
A direction signal with a logic value (1) is output at. Also, before timing T1 and after timing T3,
The output of multiplexer 29 depends on the direction signal read from said direction storage 28a. 31 is the above A-D
A 5-bit latch serving as a holding means is connected to receive the digital position signal outputted from the converter 16 via the line group LA, and the clock input terminal CK is connected to receive the digital position signal from the monostable multivibrator 26. When the unstable signal is input through the line Lll, the position signal from the A/D converter 16 is converted into a 5-bit code, for example, as shown in the amplitude information column of FIG. Stored as dynamic amplitude information.

Reference numeral 32 denotes a D-A converter which is a second supply means that receives the oscillation amplitude information stored in the latch 31 as input, and this converts the oscillation amplitude information received as input into an analog signal of an amount corresponding to the code content. The configuration is such that the signal is converted into, for example, a DC voltage E1 and output.

33 is a multiplexer as a selection means forming a part of a switching device 34 as a switching means, and one input terminal A of the multiplexer
The DC voltage E1 outputted from the D-A converter 32 is inputted to the input terminal B, and the direction signal outputted from the multiplexer 29 is inputted to the other input terminal B, and its gate terminal R-S flip-flop 35 as a generating means forming part of the switching device 34
(It is connected so that the selection signal from the output terminal Q of the means for generating the selection signal is input.

This multiplexer 33 has (1) on its gate terminal G.
When a signal is applied, the input on the input terminal A side (i.e. D
- allowing the direct voltage E1) from the A converter 32 to pass;
In addition, when the 1 signal is applied to the gate terminal G, the input from the input terminal B side (i.e., the direction signal from the multiplexer 29) is allowed to pass through. 36 connects the timing pulse CP to the line LL6. A monostable multivibrator 37 is connected to receive the signal from the monostable multivibrator 36 and outputs an unstable signal when triggered at the falling edge of the pulse phantom ℃P.
This is an AND circuit connected so that the output from the comparator 18 is received via the delay circuit 38, and the other input terminal receives the match signal from the comparator 18 via the inverter 27.

39 is an OR circuit connected such that one input terminal receives the output from the monostable multivibrator 4 via line Ll5, and the other input terminal receives the output from the AND circuit 37; Its output terminal is connected to the reset input terminal R of the R-S flip-flop 35.

Further, the set input terminal S of the R-S flip-flop 35 is connected to the output terminal of the monostable multivibrator 26. Therefore, the monostable multivibrators 26 and 36, the delay circuit 38, the OR circuit 39, etc. described above constitute a part of the switching device 34 as a device for effectively applying a selection signal to the multiplexer 33, which is a selection circuit. It is. Reference numeral 40 denotes a comparator for analog quantity comparison, to which the DC voltage E1 is applied to its positive input terminal from the D-A converter 32 in the swing amplitude control circuit 11 having the above-described configuration via the multiplexer 33, and An analog position signal from the potentiometer 17 can be applied to its negative input terminal as a feedback voltage E2.

The comparator 40 compares the applied DC voltage E1 and the feedback voltage E2 and outputs the difference voltage, and an amount of power corresponding to the level of this difference voltage is used for amplitude control as a drive control means. The signal is supplied via a driver 41 to an amplitude control actuator 42 which is a driving device. The amplitude control actuator 42 is a reversible linear motor of the direct current type, which is operatively connected directly to the sewing needle forming part of the stitch forming device or to a swing adjustment device for controlling the swing motion of the sewing needle. It is configured to control the movement of the dropping position of the sewing needle in accordance with the differential voltage amplified and supplied by the amplitude control driver 41. Further, the potentiometer 17 detects the actual position of the sewing needle and converts it into a position signal (feedback voltage E2),
As mentioned above, the input terminal of the A-D converter 16 and the comparator 4
These are applied to the negative input terminals of 0, respectively. on the other hand,
Reference numeral 43 denotes a feed control circuit that controls the feed movement of the feed dog.This feed control circuit 43 will be described below.
Since it has the same circuit configuration as the swing amplitude control circuit 11 described above, it will be briefly explained.

That is, the timing pulse FCP output from the pulse signal generator 6 via the inverter 7 is connected to the line Ll.
This counting device is a 3-bit counting means that receives input via 9, and is configured to count the pulse CP2 (see FIG. 9) that occurs at the falling edge of the timing pulse FCP, and the count contents are progressive. The contents of the count are 3
Lines L27, L28, as the stitch number code of the bit configuration
Output via L29. 45 is an OR circuit whose one input terminal is connected to receive the unstable signal from the monostable multivibrator 4 via line Ll5, and whose output terminal is connected to the reset terminal RT of the counting device 44. There is.

Therefore, the counting device 44 corresponds to the pattern selection switch S. ~S
5 is closed and the monostable multivibrator 4 generates an unstable signal, the monostable multivibrator 4 is reset. 46 indicates the counting contents of the counting device 44 on lines L27 and L2.
8. This is a decoder having the same configuration as the decoder 14 connected to receive it as an input via L29.

Reference numeral 47 is a storage device for feed control having the same configuration as the storage device 15, and the stored contents of this storage device 47 are as shown in FIG.

In addition, the blank code content in Figure 3 is ROOOOOO.
This is O.J. Reference numeral 48 denotes the A-D converter 16 as a means for converting an analog position signal outputted from a potentiometer 49, which is a position detection device to be described later, into a digital position signal and effectively applying it to the storage device 47. The A-D converter has the same configuration as the A-D converter, and outputs its output, that is, a digital position signal to the line group LB.

The storage device 47 stores the pattern code signal output from the code signal generator 2 and the digital position signal output from the A-D converter 48 on lines L2l and L2, respectively.
2, L23 and the line group LB, and similarly to the storage device 15, each address in the address group specified by the pattern code signal from the code signal generator 2 is A. A progressive search is performed using the position signal from the -D converter 48, and the memory contents thus searched are sequentially output from its output terminals D6 to D5. A comparison device 50 is a comparison means for generating a coincidence signal, and this includes six AND circuits 51 to 56 and a multi-input OR circuit 5.
7, and one input terminal of each of these six AND circuits 51 to 56 is connected to the lines L5O, l-. 1,...
Output terminal D of the storage device 47 via L55.

Receives the output from D5 to D5, and each other input terminal is a line! . , L6l, . . . output terminal D of the decoder 46 via L5. They are connected to receive the outputs from D5 to D5. Further, the output terminals of the AND circuits 51 to 56 are individually connected to the input terminals of a multi-input OR circuit 57. Therefore, in the comparator 50, similarly to the comparator 18, the storage contents of the storage device 47 and the decoder 46 are
The six 6-bit code signals output from the AND circuits 51 to 56 are compared, and if both inputs to any one of the AND circuits 51 to 56 match (1) signals, the AND circuit outputs ( 1) A coincidence signal consisting of a signal is output. 58 is from the comparison device 50! This is a falling trigger type monostable multipipeter connected to receive the coincidence signal of the line L1 via the inverter 59, and is triggered at the falling edge of the input signal, in other words, at the rising edge of the coincidence signal. outputs an unstable signal.

Reference numeral 60 denotes a direction signal generation device which is a direction signal generation means for feed control and includes a direction storage device 60a having the same configuration as the direction storage device 28a, and the stored contents of the direction storage device 60a are as shown in FIG. .

In addition, in FIG. 6, the address where RO(1)J is written means that either one of the O state code and the (1) signal is written as a direction signal.Such a direction storage device 6
0a outputs the output from the latch 5, that is, a 3-bit pattern code signal to lines 1-. 1, L22, and L23, and a 3-bit stitch count code output from the counting device 44 in response to the timing pulse FCP is connected to the lines L27,
Similarly to the direction storage device 28a, each address in the address group specified by the pattern code signal is searched by the stitch number code, The direction signal, which is the memory content retrieved in this way, is output from the output terminal D. 61 is R-S
It is a flip-flop whose set input terminal S is connected to the output terminal of the monostable multivibrator 4 through the line Ll5.
connected via.

62 is an AND circuit, one input terminal of which is connected to the output terminal Q of the flip-flop 62, and the other input terminal connected to the output terminal of the monostable multivibrator 63.

The monostable multivibrator 63 receives the timing pulse FCP through the line L19 at its input terminal, and generates an unstable signal in response to the fall of the timing pulse FCP. The output terminal of the AND circuit 62 is connected to the lines I-, 2 via an inverter 64, and is also connected to the reset input terminal R of the flip-flop 61 via a falling trigger type monostable multivibrator 65. There is. 66 is a delay circuit whose input terminal is connected to the output terminal of the inverter 64, and which receives the falling pulse SP2 from the inverter 64.
is delayed by time Td as shown in FIG.
This is what is output to 2.

67 is the multiplexer 29 as a first supply means.
is a multiplexer having the same configuration as , one input terminal A receives the direction signal output from the direction signal generator 60, and the other input terminal B receives the falling pulse SP2 output from the inverter 64. is line L
92 and is connected to be input via
The falling pulse SP2 is connected to the gate terminal G so as to be inputted via the delay circuit 66 and the line L93.

Therefore, the output terminal C of the multiplexer 67 outputs the logical value (1) at timing T5 to T6 shown in FIG.
A direction signal of logical value (1) is output at timing T6 to T7 shown in FIG. Furthermore, before timing T4 and after timing T7, the output of the multiplexer 67 depends on the direction signal read from the direction storage device 60a. Reference numeral 68 denotes a 5-bit latch serving as a holding means having the same configuration as the latch 31 connected to receive the digital position signal outputted from the A-D converter 46 via the line group LB; When the unstable signal from the monostable multivibrator 58 is input to the input terminal CK via the line L@1, the position signal from the A-D converter 48 is converted into a 5-bit code, for example, each of the lines shown in FIG. 7. It is stored and retained as sending information with code contents as shown in the sending information column.

A DA converter 69 is a second supply means that receives the sending information stored in the latch 68 as an input, and converts the sending information received as an input into an analog signal of an amount corresponding to the code content, such as a DC voltage. The configuration is to convert the data into E3 and output it.

Reference numeral 70 designates a multiplexer having the same configuration as the multiplexer 33 and serving as a selection means forming a part of a switching device 71 serving as a switching means.
- The DC voltage E3 output from the A converter 69 is input, and the other input terminal B is connected so that the direction signal output from the multiplexer 67 is input, and the gate terminal G is connected to the OR terminal. The output terminal of circuit 72 is connected.

An R-S flip-flop 73 as a generating means forming a part of the switching device 71 is connected to one input terminal of the OR circuit 72.
(The selection signal from the output terminal Q of the main stage that generates the selection signal is inputted, and the other input terminal is connected so that the timing pulse FCP is inputted via the line Ll9. 74 is the timing pulse FCP. The pulse FC is connected to receive the pulse FCP via the line Ll9.
A monostable multivibrator 75 outputs an unstable signal when triggered at the falling edge of P. One input terminal of the monostable multivibrator 75 receives the output from the monostable multivibrator 74 via a delay circuit 76, and the other input terminal is an AND circuit connected to receive the coincidence signal from the comparator 50 via an inverter 59.

77 is an OR circuit connected such that one input terminal receives the output from the monostable multivibrator 4 via line Ll5, and the other input terminal receives the output from the AND circuit 75; Its output terminal is connected to the reset input terminal R of the R-S flip-flop 73.

Also, the set input terminal S of the R-S flip-flop 73
is connected to the output terminal of the monostable multivibrator 58. Therefore, the above-mentioned monostable multivibrator 58, delay circuit 76, OR circuit 77, etc. constitute a part of the switching device 71 as a device for effectively applying a selection signal to the multiplexer 70, which is a selection circuit. It is. Reference numeral 78 denotes a comparator for analog quantity comparison, which is connected to the D-A converter 6 in the feed control circuit 43 having the above configuration.
9 to its positive input terminal via multiplexer 70.

is provided, and the position signal from the potentiometer 49 is provided to its negative input terminal as a feedback voltage E4. The comparator 78 compares the applied DC current REE, 3 with the feedback voltage E4 and outputs the difference voltage, and the amount of power corresponding to the level of this difference voltage is used for the feed control which is the drive control means. Feed control actuator 80 as a drive device via driver 79
It is designed to be supplied to The feed control actuator 80 is composed of, for example, a direct current type reversible linear motor operatively connected to a feed adjustment device for a feed dog forming a part of the stitch forming device, and is amplified by the feed control driver 79. It is configured to control the movement of the feed dog according to the supplied differential voltage. Further, the potentiometer 49 detects the adjustment position of the feed adjustment device and converts it into a position signal (feedback voltage E4).
It is applied to the input terminal of the D converter 48 and the negative input terminal of the comparator 78, respectively. Now, reference numeral 81 is a repeat operation device consisting of a total number storage device 82 and comparison circuits 83 and 84 which are devices for generating repeat signals, and this will be described below.

That is, the total number storage device 82 stores the 3-bit pattern code signal output from the latch 5 in the code signal generator 2 on the lines L2l, L2 . , l-23, which is connected to receive the two types of total number code signals stored at the designated address by being addressed by the pattern code signal to output terminals D, respectively. It is configured to output from D5 to D6 and D6 to Dll. The stored contents of the total number storage device 82 are as shown in FIG. 7, and a pair of total number code signals (6 bits) are stored at the addresses indicated by the 3-bit pattern code signals corresponding to the six types of stitch patterns. are stored, and each total number code signal is output to the bit-corresponding output terminals DO to D5 and D6 to D.
It is output from ll. and the above output terminal D. . . , 8 are connected to one input terminal of each of the AND circuits 82, 86, . and the output terminals D6 to Dll are connected to the lines L8O,
. . , 96 in the comparator circuit 84 corresponding to the feed control circuit 43, respectively. The other input terminal of each AND circuit 85, 86, . . . , 90 of the comparison circuit 83 receives the output from the decoder 14 from the line
, L4l, . The output terminal of the multi-input OR circuit 97 is line B.
It is connected to the other input terminal of the OR circuit 13 via RT. Therefore, the comparison circuit 83 has a total number storage device 82.
The total number code signal output from the output terminals D6 to D5 is compared with the count content of the counting device 12 which is decimal encoded by the decoder 15, and when the two match, a repeat signal is generated from the multi-input OR circuit 97. , this repetition signal is supplied to the reset terminal RT of the counting device 12 via the line BRT and the OR circuit 13. For this reason, the counting device 12
When the comparator circuit 83 repeatedly outputs a signal, the count contents are reset in response to this. Further, the other input terminal of each of the AND circuits 91, 92, . . . , 96 of the comparison circuit 84 receives the output from the decoder 46 on line L. ,L
1, . The output terminal of the multi-input OR circuit 98 is connected to the other input terminal of the OR circuit 45 via line FRT. Therefore, the comparison circuit 84 compares the total number code signal output from the output terminals D6 to Dll of the total number storage device 82 and the count contents of the counting device 44 encoded in decimal by the decoder 46, and when the two match, Multi-input OR circuit 9
8 generates a repetition signal and supplies this repetition signal to the reset terminal RT of the counting device 44 via the line FRT and the OR circuit 45. Therefore, when the comparator circuit 84 outputs a repeated signal, the counting device 44 resets its counting contents in response to this. Next, to explain the operation of the above structure, we will discuss, for example, the case where the cross-hatched pattern shown in FIG. 4D is formed.The principle of forming this cross-hatched pattern is to Stitches are formed in this order from number 1 to number (5) (these numbers 0 to 5 correspond to the number of stitches in Figure 8), which correspond to the 0th stitch to the 5th stitch of the needle. This is repeated in multiple units when one unit is formed, and as is clear from FIG. The falling position of the sewing needle to form up to number (5) corresponds to the 0th stitch to the 5th stitch, respectively, and the needle position coordinates are 11, 2, 11, 20, 2.
9, 20, (these correspond to each coordinate point in Fig. 4). Also, in the feed increment (feed amount and direction of the work cloth), the formation of stitch number (0) is Since this is performed successively after the formation of stitch (5), the feed increment (-5) for stitch (0) is given after the formation of stitch (5), and the feed increment is equal to the above needle position. Coordinates 11, 2, 11, 20
, 29, 20 respectively, the feed increment (-5) (+5)
, (+5), (-5), (+5), (+5), and by giving these needle position coordinates and feed increments, the cross-hatched pattern shown in Figure 4D is formed. It is something that The specific effects of this control will be described below. That is, when the pattern selection switch S4 is closed in the needle-up position, the assumed decimal number (3) is converted by the encoder 3 into a 3-bit pattern code signal ROllo, which is stored in the latch 5, and the pattern is The code signal ROllJ is on the lines L2l, l-22. is output to. Therefore, the pattern code signal ROl is sent from the pattern code generator 2 to the storage device 15 of the swing amplitude control circuit 12 and the storage device 47 of the feed control circuit 43 via lines L2l, L22, and L23, respectively.
lJ is input, and in each of the storage devices 15 and 47, an address group ROllJ corresponding to the cross-cut pattern in the six address groups is designated, respectively. Further, as mentioned above, the pattern code signal ROllJ output from the latch 5 is on the lines L2l, l-2.
2,! 3 to the direction signal generators 28 and 60 and also to the total number storage 82. On the other hand, the counting devices 12 and 44 are reset by an unstable signal from the monostable multivibrator 4 upon closing of the pattern selection switch S3, and the stitch number code that is the content of the count is ROOO.
Therefore, in the total number storage device 82, the address ROl is designated at the same time as the pattern selection switch S3 is closed, and the output terminal D thereof is designated. The total number code ROOOOOOJ from D5 to D5 is the total number code ROOOOlOO from the output terminals D6 to Dll.
J is output (see Figure 7).

That is, the (1) signal is output only from the output terminal D9, and the (0) signal is output from the other output terminals. Also, the direction storage devices 28a and 60 in the direction signal generation devices 28 and 60
At a, when the pattern selection switch S3 is closed, the address ROOOJ in each address group ROllJ is designated, and a direction signal with a logical value (0) is output from each output terminal D (Figs. 5 and 5). (See Figure 6). At this time, the astable signals output from the monostable multivibrator 4 to the line Li5 are supplied to the reset input terminals R of the R-S flip-flops 35 and 73 via the OR circuits 39 and 77, respectively, so that the R-S A (0) signal, which is a selection signal, is output from the output terminal Q of each of the flip-flops 35 and 73, and this (1 signal) is supplied to the gate terminal G of the multiplexer 33 and one input terminal of the OR circuit 72. 33 enables input terminal B to allow passage of the direction signal from multiplexer 29.
However, since the timing pulse FCP is input to the other input terminal of the OR circuit 72 via the line Ll9, when the timing pulse FCP is in the signal state of logic value (1), the multiplexer 70 is connected to its gate terminal. G receives the (1) signal from the OR circuit 72, thereby enabling the input terminal A and allowing the direct current FEE3 from the DA converter 69 to pass, and the timing pulse FCP becomes a signal state of logic value (0). At certain times, multiplexer 70 enables one of input terminals A and B according to the state of the selection signal from output terminal Q of R-S flip-flop 73. Closing of the pattern selection switch S3 described above is the first
Timing T shown in Figure 0. If it was done in
A direction signal of logical value (0) outputted from the direction storage device 28a is at timing T. - A signal of logic value (1) appears at the output terminal C of the multiplexer 29 at timing T1-T2 and is output from the encoder 3 at timing T1-T2, and is output from the encoder 3 at timing T1-T2. A signal with the logical value (1) appears at the output terminal C of the multiplexer 29. Therefore, in the swing amplitude control circuit 11,
Timing T.

- T2 has a logic value (1 direction signal passes through the multiplexer 33 and is applied to the positive input terminal of the comparator 40, so the comparator 40 compares the direction signal with the feedback voltage E2 from the potentiometer 17 and The differential voltage is amplified by the amplitude control driver 41 and the amplitude control actuator 42
supply to. As a result, the sewing needle is moved laterally in a direction that reduces the differential voltage, in other words, in a direction that reduces the feedback voltage E2 from the potentiometer 17 (i.e., the position signal). converter 16
The output, that is, the digital position signal, gradually decreases. Therefore,
The address in the address group ROllJ in the storage device 15 specified by the pattern code signal ROll from the latch 5 is at timing T. A search is made upward in FIG. 2 (in the direction of the address ROOOOOO) from the address determined by the stop position of the sewing needle in , and the stored contents of the searched address are sent to the output terminal D of the storage device 15. The data are sequentially read from D5 to D5. By searching the address group ROllJ in the storage device 15, the stitch formation order code signal ROOOOOl. If J is not output, a direction signal with a logical value (1) passes through the multiplexer 33 and is applied to the positive input terminal of the comparator 40 at timings T2 to T3, so that the direction signal from the comparator 40 in the above direction is applied. The voltage difference between the signal and the feedback voltage 2 is applied to the amplitude control actuator 42 via the amplitude control driver 41.
7, the sewing needle is moved laterally in the direction of increasing the feedback voltage E2, and in response to the increase in the feedback voltage E2, a digital position signal is output from the A-D converter 16. gradually increases. Therefore, the address group ROllJ in the storage device 15 is from address ROOOOOJ to address Rllllll.
A search is made in the direction to J, and the stored contents of the searched address are sent to the output terminal D of the storage device 15. The data are sequentially read from D5 to D5. The address group ROl of the storage device 15 as described above
When the stitch formation order code signal ROOOlOlJ is read from the address ROlOllJ by searching in lJ, the output terminal D of the storage device 15 is output. The (1) signal is supplied from D2 to one input terminal of each of AND circuits 19 and 21 via lines L3O and L32. On the other hand, the stitch count counter 12
is reset by the unstable signal from the monostable multivibrator 4 upon closing of the pattern selection switch S3 mentioned above, and the counting contents are set to ROOOJ. Therefore,
The decoder 14 receives the counted content ROOOJ of the stitch count counter 12, converts it into a decimal number (1), and outputs a (1) signal from the output terminal D, which is assumed to be a decimal number (1), to the line L4O, and other Lines L4l to L45 from output terminals D1 to D8
Based on the fact that the (0) signal is always outputted to the AND circuit 19, the (1) signal is also supplied to the other input terminal of the AND circuit 19.
This AND circuit 19 outputs one signal, which is a coincidence signal. Then, this coincidence signal triggers the monostable multivibrator 26, and the astable signal is transmitted to the clock input terminal CK of the latch 31 and the R-S flip-flop 35.
are respectively input to the set input terminals S. Therefore, at the time when the AND circuit 19 outputs the coincidence signal, A
- Output content of the D converter 16, that is, a digital quantity position signal R
OlOllJ is stored in the latch 31 as swing amplitude information, and the R-S flip-flop 35 is set and the (1) signal, which is the selection signal from its output terminal Q, is given to the gate terminal G of the multiplexer 33. Multiplexer 33 enables its input terminal A to allow the output signal from DA converter 32 to pass.
Therefore, D- receives the position signal ROlOllJ as input.
A converter 32 outputs a unique value based on the code content. A current voltage E1 is generated, which passes through the multiplexer 33 and is applied to the positive input terminal of the comparator 40, so the comparator 40 compares this DC voltage E1 with the feedback voltage E2 from the potentiometer 17 and calculates the difference voltage. is increased by the amplitude control driver 41! Width and amplitude control actuator 42
supply to. This causes the sewing needle to receive the position signal ROlOl.
The movement is controlled to the position of the needle position coordinate (11) corresponding to lJ. On the other hand, in the feed control circuit 43, the direction signal of logical value (0) output from the direction storage device 60a is at timing T. -T3 appears at the output terminal C of the multiplexer 67, and its logical (0) direction signal is applied to the input terminal B of the multiplexer 70. At that time,
The sewing needle is located above the top surface 9 of the throat plate, and the timing pulse FCP is in the signal state of logic value (1), and the timing pulse FCP is sent to the OR circuit 72 via the line Ll9.
Since the input terminal of the multiplexer 70 is supplied to one input terminal of
) signal is received, input terminal A is enabled, and D-A converter 6
Direct current FEE3 from 9 is allowed to pass through. Therefore, the feed dog feed adjustment device does not change from the adjustment position L before the pattern selection switch S3 was closed (before timing T). Next, Figure 9 and Figure 1
When the sewing machine is started at the timing shown in FIG. A 9 signal is received at its gate terminal G via circuit 72 to enable input terminal B. Also, multiplexer 67
is the direction storage device 6 at timings T4 to T5.
Logic value from 0a (1 direction signal is passed, and at timing D.~T6, (0) from the inverter 64
The signal is passed through, and the (1) signal from the inverter 64 is passed through at timings T6 to T7, and the signal that has passed through the multiplexer 67 is sent to the multiplexer 70.
is applied to the plus input terminal of comparator 78.
That is, the direction signal has a logical value (1) at timings T4 to T6, and the direction signal has a logical value (1) at timings T6 to T7.
) is passed through the multiplexer 70 to the comparator 7
Since it is applied to the positive input terminal of 8, timing T4
~T6, the feed dog is moved in a direction to decrease the feedback voltage E4 of the potentiometer 49 while being sunk from the top surface 9 of the throat plate, and at timings T6 to T7, the feed dog is moved down from the top surface 9 of the throat plate when the potentiometer 49 is moved. The feedback voltage E4 is moved in the direction of increasing. For this reason,
The digital position signal output from the A-D converter 69 gradually decreases from timing T4 to T6, and at timing T
Gradual increase from 6 to T7. Therefore, the address in the address group ROllJ in the storage device 47 designated by the pattern code signal ROllJ from the latch 5 as in Maeko is the adjustment position of the feed adjustment device before the pattern selection switch S3 is closed. From the address determined by
OOOOOOJ direction), and then from address ROOOOOJ to the lower part in Figure 3 (address Rllllll
J direction), and the stored contents of the searched address are sent to the output terminal D of the storage device 47. The data are sequentially read from D5 to D5. On the other hand, the counting device 44 counts the pulse CP2 generated at the falling edge of the timing pulse FCP at timing T4, and converts the counted contents from ROOO to ROO.
lJ, the decoder 46 receives the counted content ROOlJ of the stitch count counter 44, converts it into a decimal number (1), and outputs the line L6l from the output terminal D1, which is assumed to be a decimal number (1).
The (1) signal is output to one input terminal of the AND circuit 52 via the other output terminals DO, D2, . . .
5 to (1 signal is output. Therefore, by searching the address group ROll.U of the storage device 47 as described above, the address Rll.
When the stitch formation order code signal ROOOllOJ is read from line l-. 1 through AND circuit 5
Since the (1) signal is also supplied to the other input terminal of 2,
The AND circuit 52 outputs a (1) signal which is a coincidence signal. The coincidence signal triggers the monostable multivibrator 58, and the astable signal is input to the clock input terminal CK of the latch 68 and the set input terminal S of the R-S flip-flop 73, respectively. Therefore, the position signal RlllOlJ from the A1D converter 48 at the time when the coincidence signal is outputted from the AND circuit 52 is stored in the latch 68 as sent information, and the R1S flip-flop 73 is set to output its output. The selection signal (1) from the terminal Q is applied to the gate terminal G of the multiplexer 70 via the OR circuit 72, and the multiplexer 70 enables its input terminal A to output the output signal from the DA converter 69. Passage will be allowed. Therefore, the position signal R
The D-A converter 69 which receives the IllO signal as an input generates a DC voltage E3 having a specific value based on the contents of the code, which passes through the multiplexer 70 and is applied to the positive input terminal of the comparator 78. The device 78 compares this DC voltage 5 with the feedback voltage A from the potentiometer 49, and the difference voltage is amplified by the feed control driver 79 and supplied to the feed control actuator 80.

As a result, the feed adjustment device is moved to the adjustment position corresponding to the position signal RlllO with the feed dog sunk from the throat plate upper surface 9, and waits at that position. Sewing needle is position signal R
0 at the needle position coordinates (11) corresponding to OlOllJ
After forming the stitches, the timing T shown in FIG. 9
When reaching the position above the throat plate upper surface 9 again at 8,
Since the counting device 12 in the oscillation amplitude control circuit 11 counts the pulse CPl generated at the falling edge of the timing pulse phantom ℃P and changes the count content to ROOlJ, the decoder 1
4 receives the counted content ROOlJ of the stitch number counter 12, converts it into a decimal number (1), and outputs it from the output terminal D1, which is assumed to be a decimal number (1), to one input terminal of the AND circuit 20 via the line L4l. (1) Outputs a signal and also has another output terminal D.

, D2,..., D5 (1 signal is output. At this point, the sewing needle is located at the needle position coordinate (11) corresponding to the position signal ROlOllJ after forming the Oth stitch. The position signal RO is output from the A-D converter 16.
lOllJ is output, so the storage device 15 is
The address ROllOllJ in the address group ROllJ is designated and its output terminal D. A stitch forming order code signal 00010L is output from D5 to D5. As a result, the other input terminal of the AND circuit 20 is connected to (O
Since the sticker number is input, a matching signal is not output from the comparison device 18. Therefore, in this case, the (1) signal is applied to one input terminal of the AND circuit 37 via the inverter 27. The AND circuit 37 allows the input to the other input terminal to pass through. Therefore, when the timing pulse phantom °CP falls at timing T8 and the monostable multivibrator 36 is triggered,
The astable signal from the monostable multivibrator 36 is delayed by the delay circuit 38 and input to the reset input terminal R of the R-S flip-flop 35j.
The 1S flip-flop 35 is reset and outputs (0)8 from its output terminal Q, so the multiplexer 33 enables its input terminal B and the multiplexer 29
This allows signals from to pass through. At this time, the direction storage device 28a contains the line, ,L2. , L23, and the pattern code signal ROllJ is applied via the line ! Since the stitch number code ROOl, which is the count content of the counting device 14, is given through the terminals 4, L2, , L, the address ROOlJ in the address group ROl of the direction storage device 28a is given.
A direction signal with a logic value (1) is read out from , and this direction signal passes through multiplexers 29 and 33 and is applied to the positive input terminal of comparator 40. This causes the feedback voltage E2 from potentiometer 17 to decrease. As the feedback voltage E2 decreases, the digital position signal output from the A-D converter 16 gradually decreases, and the address group ROll of the storage device 15 becomes the address ROll.
The search is performed from the top to the top of Figure 2. When the stitch formation order code signal ROOOOlO is read out from the address ROOOlOJ by such a search, a match signal is output from the AND circuit 20 in the same manner as described above, and the monostable multivibrator 26 is triggered by this match signal. The unstable signal is input to the clock input terminal CK of the latch 31 and the set input terminal S of the R-S flip-flop 35, and accordingly, the output content from the A-D converter 16, that is, the position signal ROOOlO. J is stored in the latch 31 as amplitude information, and the multiplexer 33
enables input terminal A to allow the output signal from DA converter 32 to pass through. And latch 31
D-A receives the position signal ROOOlOJ as input from
The converter 32 generates a DC current J of a specific value based on its code content.
BEl is generated and applied to the positive input terminal of a comparator 40 via a multiplexer 33, and this comparator 40 is connected to a DC voltage and a feedback voltage from the potentiometer 17. 2, and the difference voltage is amplified by the amplitude control driver 41 and supplied to the amplitude control actuator 42. As a result, the movement of the sewing needle is controlled so that the falling position of the sewing needle is at the position of the needle position coordinate (2), and the position signal Rllll for forming the first stitch in the cloth feeding period 10 shown in FIG.
After the feed of the feed increment (+5) corresponding to the O stitch is applied to the work cloth, the first stitch is formed at the position of the needle position coordinate (2). Timing T after the first stitch is formed at the needle position coordinate (2). , the counting device 44 receives the timing pulse FC input from the pulse generator 6.
In order to count the pulse CP2 generated at the falling edge of P and change the count content (i.e., number code) ROOlJ to RROlO, the decoder 46 connects one input of the AND circuit 53 from the output terminal D2 to the line L62. to the terminal (
1) Output the signal and output the (ω signal) from the other output terminal. At this point, the feed adjustment device is at the adjustment position corresponding to the position signal RlllO for forming the 41st stitch. Since the position signal RlllO is output from the A-D converter 48, the storage device 47 is designated with the address RlllOlJ in the address group ROlL and outputs the stitch forming order code signal ROO from its output terminal D.
OllOJ is output. As a result, (1) is also connected to the other input terminal of the AND circuit 53 via the line L52.
Since the signal is input, the AND circuit 53 of the comparator 50
receives the (1) signal at both of its input terminals, continues to output the coincidence signal, and continues to supply (0 quasi) to one input terminal of the AND circuit 75 via the inverter 59. 75 prohibits passage of the unstable signal supplied from the monostable multivibrator 74 via the delay circuit 76 at the timing T9, that is, the reset signal of the R-S flip-flop 73, and sets the flip-flop 73. Continuing the state, multiplexer 7
0 is connected to its input terminal A. Subsequently, the DC current FEE,3 corresponding to the position signal RlllOlJ that is enabled and output from the DA converter 69 is passed through and applied to the plus input terminal of the comparator 78. The comparator 78 compares the DC voltage E3 with the feedback voltage E4 from the potentiometer 49 in the same manner as described above, but in this case, both voltages are different. and E5 are equal, and the difference voltage between them is zero, so the feed control actuator 8
0 is not driven and the feed adjustment device receives the position signal Rl.
It will continue to be located at the adjustment position corresponding to 11O. Thereafter, when the sewing needle rises from the needle-lower position and reaches above the throat plate upper surface 9, the timing pulse vs. °CP falls at timing TlO shown in FIG.
changes the counting content from ROOlyo to ROLIOJ,
The decoder 14 outputs the (1) signal from its output terminal D2 to one input terminal of the AND circuit 21 via the line L42, and outputs the (ω signal) from the other output terminal. At this time,
The sewing needle is placed after forming the first stitch and receives the position signal ROOO.
lO. Since the needle is located at the needle position coordinates (2) corresponding to J, the A-D converter 16 outputs the position signal ROOOlOJ.
is output, address ROOOlOJ in the address group ROllJ of the storage device 14 is specified, and ROOOOlOJ, which is the storage content of that address, is output.

Therefore, since the (1 signal) is input to the other input terminal of the AND circuit 21, a coincidence signal is not output from the comparator 18, and the (1 signal is input to one input terminal of the AND circuit 37 via the inverter 27). ) signal is given and the timing T
At IO, an unstable signal from the monostable multivibrator 36 triggered by the falling edge of the timing pulse is inputted to the reset input terminal R of the R-S flip-flop 35 via the delay circuit 38, and the flip-flop 35 is reset and outputs from its output terminal Q (1
A signal is output to enable input terminal B of multiplexer 33 so that multiplexer 33 allows the signal from multiplexer 29 to pass. On the other hand, the direction storage device 28a stores the pattern code signal ROll. J and the stitch number code ROlOJ which is the count content of the counting device 12, and the direction signal of logical value (1) is read out as shown in FIG. is applied to the positive input terminal of Therefore, the sewing needle is moved in the direction in which the feedback voltage E2 from the potentiometer 17 increases, and in accordance with the increase in the feedback voltage E2, the digital position signal output from the A-D converter 16 gradually increases. 15 address group 1011J is the address ROOOlO. A search is made from J to the bottom in FIG. When the stitch formation order code signal ROOOlOlJ is read out from the address ROlOll through such a search, a match signal is output from the AND circuit 21 in the same manner as described above, and the monostable multivibrator 26 is triggered by this match signal. The unstable signal is connected to the clock input terminal CK of the latch 31 and the R-S flip-flop 35.
are respectively input to the set input terminals S of A-D.
The output content from the converter 16, that is, the position signal ROlOllJ
is stored as amplitude information in the latch 31, and the multiplexer 33 enables the input terminal A to allow the output signal from the DA converter 32 to pass. The DA converter 32 receives the position signal r'01011j from the latch 31 as an input, and transmits the DC voltage E1 corresponding to the position signal to the comparator 40 via the multiplexer 33.
The amplitude control actuator 42 is driven thereby to control the movement of the sewing needle so that the dropping position of the sewing needle is at the position of the needle position coordinate (11), and the cloth feed shown in FIG. 9 is performed. In period 10, the feed increment (
After the feed of +5) is applied to the work cloth, the needle position coordinate is 0.
A second stitch is formed at position 1). After forming this second stitch, timing pulse F for feed control
When the counting contents of the counting device 44 progresses due to the CP and the stitch number code ROl is output, this stitch number code ROl is transferred to the lines L27, L28, ! Decoder 4 received via 9
6 outputs a (1) signal from its output terminal D3 to line L63.

On the other hand, as mentioned above, the output terminal D9 of the total number storage device 82
Since the (1) signal is output to the line L3 from the
) signal is added, and the (1) signal output from the AND circuit 94 as a repetitive signal is input to the reset terminal RT of the counting device 44 via the multi-input OR circuit 98 and line FRT. As a result, the counting device 44 is reset to output the stitch number code ROOO at the moment it outputs the stitch number code 0011, and the decoder 46 outputs the stitch number code ROOO again. From only (1)
It will start outputting a signal. Therefore, from now on, the counting device 44 outputs the stitch number codes ROOO, ROO, and ROIO repeatedly by the timing pulse FCP for feed control, and as a result, the Oth stitch, the 3rd stitch, the 1st stitch, and the 4th stitch are output.
The feed information for the stitches, the second stitch, and the fifth stitch are the same, and the feed information for the third to fifth stitches is obtained in the same manner as described above. Also, the output terminal D of the total number storage device 82. Noji P
As mentioned above, all outputs from 5 are (0) signals,
Therefore, the decoder 14 receives the stitch number code R from the counting device 12.
OO, ROIO, . . . , RIO are inputted to the output terminal D of the decoder 14. Even if the (1) signals are sequentially output from D5 to D5, the (1) signal, which is a repetitive signal, is not output from any of the AND circuits 85 to 90 of the comparison circuit 83. Therefore, the counting device 12 is not reset before outputting the counting conode RlOlJ, and the oscillation amplitude information for the third to fifth stitches can be obtained in the same manner as described above. Note that the counting devices 12 and 44 receive new counting manual power (pulse C
Pl, CP2) is added to 5 and reset. Therefore, the counting device 12 is reset after forming the 5th stitch and outputs the stitch number code ROOOJ, and thereafter the stitch number code 0 is output from the counting device 12 by the timing pulse BCP for amplitude control as described above.
r000. j, r001J, and r101J are repeatedly output in sequence. Then, based on the swing amplitude information and feed information for the 3rd to 5th stitches obtained as described above, the 3rd to 5th stitches are
The 5th stitch is formed, and each stitch of the cross stitch pattern is formed according to the information from the 0th stitch to the 5th stitch. By repeating the stitch formation, the same stitch pattern is continuously formed. Note that the control operations for other types of stitch patterns shown in FIGS. 4A, B, C, E, and F are the same as those described above, and therefore their explanations will be omitted. According to the above embodiment, the storage devices 15 and 47 storing stitch formation order code signals corresponding to six types of stitch patterns are provided, and the storage devices 15 and 47 store stitch formation order code signals. In connection with the readout, oscillation amplitude information and feed information for controlling the relative position of the sewing needle and the workpiece cloth fed by the feed dogs are obtained, and these are stored and held in the latches 31 and 68. ing.

The reading of the stitch formation order code signal described above, that is, the search of the address groups in the storage devices 15 and 47 is performed using the pattern code signal outputted from the code signal generating device 2 in response to the pattern selection operation by the pattern selection switch group 1. position signals in digital quantities from A-D converters 16 and 48 in response to position signals in analog quantities representing the swing position of the sewing needle and the adjustment position of the feed adjustment device outputted by potentiometers 17 and 49; I try to do it by. Further, the direction in which the address groups in the storage devices 15 and 49 are searched is determined by direction signals stored in the direction storage devices 28a and 60a. In short, according to this embodiment, the amplitude control actuator 42 and the feed control actuator 80 are initially driven based on the direction signal, regardless of the swing amplitude information and feed information (stitch data) stored in the latches 31 and 68. And after that. The actuators 42 and 80 are controlled based on the information stored in the latches 31 and 68, and a predetermined amount of starting power determined by the direction signal is applied to each actuator 42 and 80 for each stitch. As you do so, the actiyue. data 42
and 80 are set regardless of the stitch data, and as a result, high-speed positioning of the stitch forming device can be achieved without significant improvement of the stitch forming device and each actuator 42, 80. It is possible to do this. Further, the oscillation/oscillation amplitude information and the feed information are obtained by searching for the oscillation motion of the sewing needle and the movement of the feed adjustment device, and the amplitude control actuator 42 and the feed adjustment device are used to operate the sewing needle and the feed adjustment device. Since the response speed of the feed control actuator 80 determines the generation speed of the swing amplitude information and feed information, it is possible to increase the generation speed. In particular, according to this embodiment, since the storage devices 15 and 49 are made of semiconductors, the storage contents can be quickly read out from the storage devices 15 and 49, and generally, unlike the conventional storage devices, for example, magnetic Compared to the case where tape, perforated tape, etc. are used, the seam forming speed of the sewing machine can be increased, and the overall size can be reduced. It should be noted that the present invention is not limited to the above-mentioned types of stitch patterns, but can also be applied to the formation of other types of stitch patterns in the same manner as described above, and that each of the above-mentioned stitch patterns is Although it is assumed that the stitches are formed from six stitches, it goes without saying that the number of stitches can be any number.

As is clear from the above description, according to the present invention, it is possible to perform high-speed positioning of the seam forming device without significantly improving the seam forming device, the driving device, etc. It is possible to provide a sewing machine that can generate stitch formation information quickly and reliably, and can form a stitch pattern in a predetermined shape quickly and reliably.

[Brief explanation of the drawing]

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 FIGS. Figure 3 is a diagram showing the storage contents of different storage devices,
FIG. 4 is a diagram showing different types of stitch patterns, FIGS. 5 and 6 are diagrams showing the memory contents of different direction signal generating means, and FIG. 7 is a diagram showing the memory contents of different direction signal generating means, and FIG. FIG. 8 is a diagram showing the contents of the storage of the total number storage device, FIG. 8 is a diagram showing the control contents of each stitch pattern, and FIGS. 9 and 10 are time charts for explaining the different operations of the embodiment. In the figure, 1 is a pattern selection device, 2 is a code signal generator, code signal generating means, 6 is a pulse signal generator, BCP.
．． FCP is timing pulse (timing pulse signal)
, 11 is a swing amplitude control circuit, 12 and 44 are counting devices (
15 and 47 are storage devices, 16 and 48 are A-D converters (means for effectively applying a position signal to the storage device), 17 and 49 are potentiometers (position detection devices), 18 and 47 are storage devices; 50 is a comparison device comparison (means), 2
8 and 60 are direction signal generation devices (direction signal generation means);
28a and 60a are direction storage devices, 29 and 67 are first
31 and 68 are latches (holding means), 32 and 69 are DA converters (second supply means), 34 and 71 are switching devices (switching means), 33 and 70 are multiplexers (selection means)
, 35 and 73 are flip-flop circuits (generating means) as means for generating selection signals, 42 is an amplitude control actuator (drive device), 43 is a feed control circuit, 80 is a feed control actuator (drive device), and 81 is a repetitive operation. 82 is a total storage device, 83 and 84 are comparison circuits (
1 shows a device 5 for generating repetitive signals;

Claims (1)

[Claims] 1 A pattern selection device for selecting a desired stitch pattern from among a variety of predetermined stitch patterns, and a structure capable of moving within a certain range to form the selected stitch pattern. A sewing machine comprising a seam forming device with a seam forming device and a drive device operatively connected to the seam forming device or its adjustment device for moving or controlling the movement of the seam forming device, the sewing machine comprising: The number of address groups made up of addresses is equal to the number of types of stitch patterns, and a stitch formation order code signal representing the order of stitch formation in one stitch pattern is sent to a predetermined number in each address group. a storage device storing addresses, and code signal generating means for generating a pattern code signal corresponding to a stitch pattern selected by the pattern selection device to designate one address group in the storage device;
a pulse signal generating device that generates a timing pulse signal in temporal relation to the stitch forming operation by the stitch forming device; a counting means that advances counting contents in response to the timing pulse signal; A direction signal indicating a direction in which the stitch forming device or its adjusting device should be moved for forming each stitch in the stitch pattern is generated in response to the pattern code signal from the code signal generating means and the count contents of the counting device. a directional signal generating means for generating a directional signal; first supply means for supplying a directional signal to the drive device to move the stitch forming device or its adjusting device in a direction according to the directional signal; a position detection device that detects the position of the device or its adjustment device and generates a position signal; and a position detection device that detects the position of the device or its adjustment device and generates a position signal; means for converting the pattern code signal into a signal and effectively applying it to the storage device; A device for effectively applying voltage to the storage device, and comparing the stitch formation order code signal within the address specified by the pattern code signal and address designation signal with the count contents of the counting means, and comparing both. a comparison means for generating a coincidence signal when the signals match; a holding means for holding the position signal or the address designation signal in response to the coincidence signal; second supply means for supplying the retained signal to the drive device for positioning the adjustment device; and responsive to the coincidence signal, disabling the first supply means and disabling the second supply means; a switching means for activating the means; and a drive control means for controlling the amount of power supplied to the drive device in accordance with a signal supplied by one of the first and second supply means. sewing machine.