JPS6060889A - Electronic sewing machine - Google Patents

Abstract

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

Description

Detailed Description of the Invention Technical Field The present invention relates to an electronic sewing machine that automatically forms a preselected desired pattern on a workpiece cloth, and more particularly, the present invention relates to an electronic sewing machine that automatically forms a preselected desired pattern on a workpiece cloth, and more particularly, the present invention relates to an electronic sewing machine that automatically forms a preselected desired pattern on a workpiece cloth. The present invention relates to a technique for accurately forming a desired pattern without protruding from the area or being unevenly distributed within the area.

Prior Art In electronic sewing machines that automatically form a desired pattern selected from pre-stored patterns, the number of types of patterns that can be sewn has been expanded in recent years to, for example, over 100 types. Generally, an image of the symbol is displayed on the front of the sewing machine.

However, because the display area for displaying the pattern image on the front of the sewing machine is limited, as the number of types of patterns that can be sewn increases, the size of the pattern image displayed on the front of the sewing machine is smaller than the actual size of the pattern. There is a tendency to become smaller and smaller. For this reason, with such conventional electronic sewing machines, it is difficult to predict the dimensions of the pattern that will actually be formed on the workpiece cloth from the shape displayed on the front of the sewing machine and set the sewing position, and it is difficult to set the sewing position. The amount of fabric that should be processed
When forming a desired pattern within a region, there is a problem in that the pattern protrudes from the sewing region or is unevenly distributed within the sewing region.

In contrast, by adjusting the pattern shape changing devices such as the needle amplitude adjuster and work cloth feed amount adjuster, and sewing the desired pattern on a trial basis prior to actual sewing, it is possible to check whether the desired pattern fits accurately within the sewing area. It is conceivable to check whether the pattern is correct or not, but it would be extremely troublesome for the operator to carry out trial sewing every time a pattern is formed.

Purpose of the Invention The present invention has been made against the background of the above-mentioned circumstances, and its object is to provide a sewing area on a workpiece cloth on which a pattern is to be formed with a pattern having the same size as the sewing area. An object of the present invention is to provide an electronic sewing machine capable of forming a desired pattern.

Structure of the Invention In order to achieve the above object, the gist of the present invention is to control the relative position of a sewing needle and a work cloth in order to form each pattern in a cycle pattern of predetermined reference dimensions. In a sewing machine that is equipped with a stitch signal generator that generates a stitch signal and that automatically stops the vertical and reciprocating movement of the sewing needle after completing the formation of a cycle pattern in accordance with the stitch signal, a designated operating body that can be operated manually to specify the size of the sewing area; ■ Calculates the reduction/enlargement ratio of the pattern based on the size of the sewing area specified by the designated operating body and the reference dimension; , and a signal changing circuit for changing the size of the stitch signal (2) according to its reduction/enlargement ratio.

Effects of the Invention With this method, when the size of the sewing area on the workpiece cloth in which a cycle pattern is to be formed is specified according to the operation of the specified operating body, the size of the sewing area and the selected cycle are determined in the signal changing circuit. The reduction/enlargement ratio is calculated based on the standard dimensions of the pattern, and the size of the stitch signal generated from the stitch signal generator is adjusted between the size of the cycle pattern and the size of the sewing pattern according to the reduction/enlargement ratio. changed to match. For this reason, the size of the cycle pattern formed on the work cloth is automatically matched with the size of the sewing area, so the cycle pattern will never protrude from the sewing area or be unevenly distributed within the sewing area. It will be resolved.

Embodiment FIG. 1 shows the external appearance of an electronic sewing machine to which the present invention is applied, in which a pillar part 12 is erected on a bed part 10, and an arm part 14 is attached at one end by the pillar part 14. supported horizontally.

A head 16 is formed at the other end of the arm portion 14,
At the lower end of the head 16 is a needle bar 20 equipped with a sewing needle 18 that is reciprocated in the vertical direction in synchronization with the rotation of a sewing machine main shaft (not shown), and that is moved to the upper W position and lowered position by manual operation. A presser foot 22 is provided. On the other hand, in the vicinity of the needle drop point of the sewing needle 180 in the bed section 10'2, there is provided a feed channel 24 for feeding the machining needle by being reciprocally driven in synchronization with the rotation of the sewing machine main shaft.

A pattern display section 26 provided on the front surface of the arm section 14 displays a large number of patterns (approximately 100 types) consisting of groups A, B, and C together with pattern numbers for two fingers (not shown). Those belonging to Group B are so-called continuous sewing patterns, including practical stitches such as straight stitches and zigzag stitches, as well as decorative patterns.
Items belonging to group A include letters such as alpha bents and numbers, and patterns belonging to group C include a series of patterns or letters. The patterns belonging to groups A and C are so-called cycle patterns in which each pattern is sewn individually.

Below the pattern display section 26 are ten pattern selection switches 2 each having a fixed number for selecting a desired pattern.
8 are arranged. The pattern selection switch 28 also serves as a designation operating body for inputting the dimensions of the sewing area of a desired pattern. Further, on the right side of the pattern display section 26, there is a two-finger numeric display 30 for displaying the pattern number or the dimensions of the sewing & V area where the pattern is to be formed, and a 1-cycle designation for designating single-cycle sewing. A switch 32 and a display changeover switch 34 for switching the number displayed on the number display 30 from the pattern number to the size of the sewing area are provided together with LEDs 36 and 38 for displaying the respective operations. A combination designation switch 39 for designating a combination of cycle patterns is provided between the pattern selection switch 28 and the display changeover switch 34. Note that 40 is a start/stop switch for starting and stopping the sewing machine, and 4''2 is a speed setting device for setting the speed of the sewing machine motor 44 to a desired value.

The electronic sewing machine configured as described above is equipped with a control circuit shown in FIG. 2. That is, when the pattern number of two fingers corresponding to a desired pattern is input to the encoder 46 according to the operation of the pattern selection switch 28, the encoder 46
is converted into a code signal representing the input numerical value,
The code signal passes through the gate 48 to the top address memory 50° pattern discriminator 52. Stitch number data memory 54. The pattern data SM is supplied to the input capo L of the multiplexer 56. The gate 48 is connected to a display switching signal D, which will be described later.
When C is generated, the destination of the output signal of the encoder 46 is switched, and the display switching signal DC
is generated, the pattern selection switch 28 is used as an input key for inputting the dimensions of the sewing area on the workpiece cloth in which the selected desired cycle pattern is to be made, and the encoder A signal representing the size of the sewing area, which is an output signal of 46, is supplied through gate 48 to reduction/enlargement ratio calculation circuit 58 and input port H of multiplexer 5G as sewing length data SL. Note that the encoder 46 is configured to generate an operation signal SO when two finger values are input from the pattern selection switch 28, and the operation signal SO is sent to the adder 60.
and 62 load input terminals.

The start address memory 50 stores a large number of start addresses corresponding to each pattern, and the input pattern data S
The first address corresponding to M is supplied to the channel selector 64. The channel selector 64 allows the start address from the i'in address memory 50 to pass through the channel selector 64 to the pattern code memory 68 in a state where a start signal SST is not generated from a motor control circuit 66 (to be described later). Allowed, but start signal SS
If T is being generated, the pattern code memory 68
The first address output from the channel selector 64
The data is allowed to pass through to the stitch data generation device 70 via.

The stitch data generator 70 is supplied with a timing signal TS synchronized with the rotation of the main shaft of the sewing machine (not shown) from a timing signal generator 72, and forms a pattern corresponding to the pattern data SM in synchronization with the timing signal TS. A series of stitch signals are sequentially supplied to actuator drive circuit 74. That is, the stitch data generating device 70 has, for example, an address counter that is loaded with a leading address and counts a timing signal TS in addition to the contents of the load, and various types of stitch signals that are stored in advance. It is equipped with a stitch data memory, etc., which sequentially outputs stitch signals addressed according to the count contents. Then, each stitch signal is a sewing needle 18.
The needle position signal SH is composed of a needle position signal S L (representing the swing position of the work cloth) and a feed signal SF representing the feed amount and direction of the work cloth. SF is supplied to the actuator drive circuit 74 via the data change circuit 80.
The stitch data generator 70 is configured to generate an end signal SE when a series of stitch signals generated therefrom reaches its end, and the end signal SE is generated by an AND circuit. 82 (shared).

The actuator drive circuit 74 converts the needle position signal SII and the feed signal SF into analog signals, amplifies the power, and supplies the signal to the needle swing actuator 76 and the feed actuator 78, respectively. The sword swing actuator 76 changes the swing position of the needle bar 20 by driving the needle swing mechanism, and the feed actuator 78
By determining the rotational position of a feed adjuster (not shown), the amount and direction of feed of the work cloth by the feed dog 24 are changed.

In the data changing circuit 80, the reduction/enlargement ratio/ii
A coefficient signal SK representing the reduction/enlargement ratio is supplied from the i calculation circuit 58, and the coefficient signal SK is adjusted to the magnitude represented by the sending signal SF.
The sending signal SF is multiplied by the reduction/enlargement ratio represented by
The magnitude of is changed and corrected, and the corrected sending signal SF
is supplied to the actuator drive circuit 74i.

The pattern discriminator 52 determines whether the pattern corresponding to the pattern data SM belongs to the cycle pattern (single sewing pattern) of group A or C, or to the continuous sewing pattern of group B. and if it belongs to a cycle pattern, a signal of level (■) is supplied to the AND circuit 84.A signal of 14 levels is supplied to the AND circuit 84 in response to the pressing operation of the combination designation switch 39. Following the selection of the cycle pattern, a signal indicating that a combination has been designated is supplied from the AND circuit 84 to the address counter 86 via the OR circuit 82, and an addition command signal S is supplied to the adders 60 and 62. The address counter 86 receives the activation signal SST.
A clear signal consisting of a pulse with a fixed time width is supplied from the one-shot multi-circuit 88 after the occurrence of the pulse, and the count contents of the at1/counter 86 are cleared to zero by the clear signal. ing. Further, the contents of the numerical value of the address counter 86 are supplied to the pattern code memory 768 as a signal specifying its temporary storage location or the reading location of the stored top address.

The pattern code memory 68 enters a reading state when the activation signal SST is not supplied, and temporarily stores the start address supplied from the start address memory 50 via the channel selector 64 in a location specified by the count contents of the address counter 86. 10, while the start signal SST
is being generated, a continuous state occurs, and the leading address of the location specified by the count contents of the address counter 86 is outputted to the stitch data generating device 70 via the channel selector 64.

The stitch number data memory 54 stores the number of stitches of each cycle pattern, and supplies the adder 60 with a signal representing the number of stitches corresponding to the pattern data SM. Adder 6
0 loads a signal representing the number of stitches output from the stitch number data memory 54 in response to the operation signal SO, a cycle pattern is selected, and the combination designation switch 39 is pressed. The loaded signals are added according to the addition command signal SΔ which is generated at the same time.

Then, a stitch number signal SN representing the total value of the added result is supplied from the adder 60 to the motor control circuit 66.

The motor control circuit 66 includes, for example, a T-type flip-flop 7 circuit that alternately generates and extinguishes a start signal SST in accordance with the pressing operation of the start/stop switch 40, and a 1 cycle designation signal indicating that the 1 cycle designation switch 32 is operated. In the state where ST is supplied, the stitch number signal SN
A subtraction counter is provided in which the number of stitches represented by is loaded and subtracted in response to a timing signal TS, thereby resetting the T-type flip-flop circuit when the loaded content decreases to zero. Then, when the count content of the subtraction counter is reduced to a predetermined constant value, a shift command signal STO is supplied to the motor drive circuit 92, and then, when the count content reaches zero and the needle position is detected. When a raised position signal SU indicating that the needle position is at the "2 raised position" is supplied from the device 94, the motor drive circuit 92
The start signal SST, which was being supplied to the start signal SST, is now stopped.

In the motor drive circuit 92, while the start signal SST is being supplied, a signal representing the actual speed of the sewing machine motor 44 supplied from the speed detector 96 and a double voltage supply representing the command speed supplied from the speed setting device 42 are output. Electric power is supplied to the sewing machine motor 44 so that the sewing machine motor 4
The speed of No. 4 is controlled to the speed set by the speed setting device 42.

Further, while the speed change command signal STO is being supplied in addition to the start signal SST, electric power for driving the sewing machine motor 44 at a predetermined low rotational speed is output, and the sewing machine motor 44 is driven at a low speed. On the other hand, start signal SS
When the supply of T is stopped, the power supply to the sewing machine motor 44 is stopped. Therefore, when a pattern belonging to the cycle pattern is selected by the pattern selection switch 28, the sewing machine motor 44 is driven at a low speed at a certain period before the completion of sewing the cycle pattern.
Furthermore, when the sewing of the cycle pattern is completed, the sewing needle 18
When the sewing machine motor 44 reaches the raised position, the sewing machine motor 44 is automatically stopped. Here, the output signal of the 1-cycle designation switch 32 is supplied to a T-type flip-flop circuit 98, and each time the 1-cycle designation switch 7-ch 32 is pressed, the T-type flip-flop circuit 98 outputs cents or cents. By doing so, T
The H-level one-cycle designation signal S■ supplied from the flip-flop circuit 98 to the motor control circuit 66 and the AND circuit 100 is generated and extinguished every time the pressing operation is performed. Further, the output signal of the display changeover switch 34 is also supplied to another T-type flip-flop circuit 102, and from the T-type flip-flop circuit 102 to the AND circuit 1.
The signal supplied to 00 (H level) is generated and extinguished every time the display changeover switch 34 is pressed. Therefore, AND circuit], 00 to gate 48
and display switching signal D supplied to multiplexer 56
C (H level) indicates that both the 1 cycle designation switch 32 and the display changeover switch 34 have been pressed, in other words, a cycle pattern is being stitched! 1! ! This indicates that (discontinuous sewing) has been designated and a switching operation has been performed to input and display on the numerical display 30 the area where the pattern is planned to be formed on the work cloth.

The multiplexer 56 always selects the human-powered boat 1, so the pattern data SM is supplied to the display drive circuit 104 via the multiplexer 5G (321); however, when the display switching signal DC is supplied, the human-powered boat 1 is selected. By selecting boat H, sewing length data SL representing the length of the sewing area where a pattern is to be formed on the work cloth is allowed to be supplied to display drive circuit 104 via multiplexer 56. The display drive circuit 104 supplies a display signal to the numeric display 30 so that the numerical value represented by the supplied signal is optically displayed on the numeric display 30.

The operation of this embodiment will be explained below.

1111 When sewing one of the continuous sewing patterns belonging to group B, the pattern number of the continuous sewing pattern is input by pressing the pattern selection switch 28, and
Cycle designation switch 32 and display changeover switch 34
are not operated together. Therefore, since the display switching signal DC cannot be generated, the output signal of the encoder 46 is passed through the gate 48 as pattern data SM to the start address memory 50. The signal is supplied to the multiplexer 56 and the like.

Since the input port L of the multiplexer 56 is selected, the pattern data SM is sent to the multiplexer 56.
is supplied to the display drive circuit 104 through the numeric display 3.
0 displays the pattern number of the selected continuous sewing pattern. At this time, even if the input port ■l of the multiplexer 56 is selected due to the erroneous operation of the l cycle designation switch 32 and the display changeover switch 34 and the generation of the display changeover signal DC, the sewing length data ST , is not output, so nothing is displayed on the numeric display 3°. Furthermore, since the pattern data SM supplied to the pattern discriminator W52 corresponds to a continuous sewing pattern, no signal is output from the pattern discriminator 52, even if three combination designation switches are operated. Also, no signal is output from the AND circuit 84. For this reason,
No count signal is supplied to the address counter 86, and the temporary storage location 1a or readout location of the leading address in the pattern code memory 68 is always designated at a constant address, for example, address zero. First address memory 50
The head address corresponding to the pattern data SM supplied to it is output from 1/6 on the channel.
4 is not supplied with the start signal SST, the first address from the first address memory 50 is supplied to the pattern coat memory 6B via the channel selector 64,
It is temporarily stored at that zero address. Since the activation signal SST is not supplied to the pattern code memory 68 either, the pattern code memory 68 is in the &;I:reading state.

When the start/stop switch 40 is pressed in the above state, the start signal SST is supplied from the motor control circuit 66 to the morph drive circuit 92, so the sewing machine motor 44 is driven at the speed set by the speed setting device 42. ,
The drive J of this sewing machine motor 44 is the start/stop switch 40.
This continues until the button is pressed again. At this time, the activation signal SST is also supplied to the channel selector 64 and the pattern code memory, so that the pattern code memory 68 is brought into a continuous state, and the start address already stored at the zero address is transferred from the pattern code memory 68 to the channel selector 6.
The stitch data is supplied to the stitch data generator 70 via the stitch data generator 70. Therefore, a stitch signal consisting of a needle position signal 5IT and a feed signal SF is sequentially supplied from the stitch data generator 70 to the actuator drive circuit 74 in synchronization with the timing signal TS, so that a continuous sewing pattern can be created. It is formed continuously on the work cloth. At this time, since the sewing length data SL is not outputted from the gate 48, the reduction/enlargement ratio calculating circuit 58 supplies the coefficient signal SK whose content is set to 1 to the data changing circuit 8o. Therefore, since the 1 cycle designation signal Sl is supplied to the reduction/enlargement ratio calculation circuit 58, the content of the count signal SK supplied to the data change circuit 8o is set to 1, and the stitch data generator 7o
However, the magnitude of the sending signal SF supplied to the actuator drive circuit 74 is not changed.

Next, when forming one of the cycle patterns belonging to pattern group A or C, the pattern number of the cycle pattern is input according to the operation of the pattern selection switch 28, and the pattern number is input according to the operation of the one cycle designation switch 32. By setting the T-type flip-flop circuit VFrD8, a one-cycle designation signal Sl is supplied to the motor control circuit 66, and the LED 36 is turned on. At this time, the cycle pattern is discriminated in the pattern discriminator 52 and an output signal is supplied to the AND circuit 84. However, when - cycle patterns are formed, the combination designation switch 39 to combine the cycle patterns is activated. Since the address counter 86 is not counted, no signal is provided to the address counter 86 to enable it to be counted in the same way as in the operation described above. Therefore, from the start address memory 50, the start address of the round forming the cycle pattern corresponding to the pattern data SM is temporarily stored at address zero of the pattern code memory 68 via the channel selector 64.

On the other hand, in the stitch number data memory 54, the pattern data S
A signal representing the number of stitches of the pattern corresponding to M is supplied to the adder 60, and the adder 60 is loaded with a signal representing the number of stitches according to the operation signal SO.
A stitch number signal SN representing the number of stitches of one selected cycle pattern, which is the loaded content from 0, is supplied to the motor control circuit 66. In addition, unit length data memory 5
5, a signal representing the unit length (reference length) of the pattern corresponding to the pattern data SM is supplied to the adder 62, where it is loaded in accordance with the operation signal so. Then, a signal representing the unit length of one selected cycle pattern, which is the content loaded from the adder 62, is supplied to the reduction/enlargement ratio calculation circuit 58.

When the display selector switch 34 is first pressed to designate the size of the sewing area in which to form one selected desired cycle pattern, the T-type Frisobfromp circuit 102 is set. H from the type flip-flop circuit 102 to the AND circuit 100 and the LED 38
Since the level signal is supplied, the display switching signal DC is generated. Therefore, gate 48 is switched, input port H of multiplexer 56 is selected, and LED 38 is illuminated.

Next, when the pattern selection switch 28 is operated as a numerical keypad for inputting the size of the sewing area, a signal representing the size of the sewing area generated from the encoder 46 passes through the gate 48 to determine the sewing length. The data is supplied as data SL to the reduction/enlargement ratio calculation circuit 58 and the multiplexer 56. Therefore, in the reduction/enlargement ratio calculation circuit 58,
The ratio between the unit length of the desired cycle pattern supplied from the adder 62 and the size of the input tight area (length of the sewing area in the work cloth feeding direction ÷ length of the cycle pattern in the work cloth feeding direction) is calculated. The reduction/enlargement ratio (correction coefficient) is calculated by taking the coefficient signal SK representing the reduction/enlargement ratio.
is supplied to the data modification circuit 80. In addition, since the user's capo) H is selected in the multiplexer 56, the sewing length data SL is supplied to the display drive circuit 104 through the multiplexer 56, and the workpiece cloth feed of the input sewing area is displayed in the numerical display 30. The length dimension kJ in the direction is displayed.

When the start/stop switch 40 is suppressed in the above state, the start signal SST is supplied from the motor control circuit 66 to the morph drive circuit 92, so that the selected desired cycle pattern is changed according to the same operation as described above. The cycle pattern is formed on the work cloth so that the length dimension in the work cloth feeding direction of the cycle pattern formed on the work cloth matches the length dimension of the already displayed sewing area. . That is, a series of stitch signals generated from the stitch data generator 7° are determined so that the size of the selected cycle pattern on the workpiece cloth is a predetermined size (a reference length in the workpiece cloth feeding direction). However, in the data change circuit 8°, a coefficient signal SK representing the reduction/enlargement ratio, which is the ratio between the reference length of the selected cycle pattern and the length of the sewing area allowed to be sewn on the work cloth, is used to change the reduction/enlargement. The reduction/enlargement ratio supplied from the ratio calculation circuit 58 and represented by the coefficient signal SK in the data change circuit 80 is
Transmission SF generated from the 1 data generator 70
The magnitude of the sending signal Sr' is corrected by multiplying by Sr', and the corrected sending signal SF is supplied to the actuator drive circuit 74. For example, the length of the selected desired cycle pattern f1'' (standard length) is 20
mm, and the permissible tightening area on the work cloth is 16 mm, the coefficient signal SK representing reduction/enlargement +-08 is supplied to the data change circuit 8o, so the size of the feed amount is The send signal SF corrected by 20% is supplied from the data change circuit 80 to the actuator drive circuit 74. As a result, the length of the desired cycle pattern formed on the work cloth can be made to accurately match the length of the sewing area inputted in advance.

Furthermore, even when a plurality of desired cycle patterns are combined, the length of the combined cycle patterns in the work cloth feeding direction can be made to match the length of the 8-fiber region on the work cloth where pattern formation is allowed. . That is, when the pattern number of the desired first cycle pattern is input in accordance with the operation of the pattern selection switch 28 while the 1 cycle designation switch 32 and the display changeover switch 34 are pressed, the pattern selection switch 34 is operated in the same manner as described above. The start address corresponding to the first cycle pattern is temporarily stored at address zero of the pattern code memory 68. Next, combination designation switch 3
When 9 is pressed, AND circuit 84 to OR circuit 8
Since the signal is supplied to the address counter 86 through 2, the address counter 86 counts the signal. Therefore, 1 is added to the contents of the address counter 86, so that the signal representing the contents of the address counter 86 changes the temporary location ↑a in the pattern code memory 68 to address 1. When the pattern number of the second desired cycle pattern is input according to the operation of the pattern selection switch 28, the start address corresponding to the second cycle pattern is temporarily stored in address 1 of the pattern code memory 68. . By repeating such operations, a desired number of cycle patterns can be combined. At this time adders 60 and 6
2, the number of stitches and the unit length are sequentially added according to the addition command signal SA output from the AND circuit 84, so the motor control circuit 66 receives the stitch number representing the total number of stitches of the combined cycle pattern. Several times; SN is supplied.

Next, when the cycle designation switch 32 and the display changeover switch 34 are pressed and the display changeover signal DC is generated, the size of the sewing area on the workpiece cloth (the dimension in the workpiece cloth feeding direction) is selected as the membrane type. The input is made according to the operation of the switch 28. The dimensions of the sewing area are those in which the selected cycle pattern combination is to be formed. Sewing length data SI representing the size of the sewing area is supplied from the gate 48 to the reduction/enlargement ratio calculation circuit 58 and also to the display drive circuit 104 via the multiplexer 56, in the same manner as in the above-described operation. As a result, the reduction/enlargement ratio calculation circuit 58 can calculate the reduction/enlargement ratio by taking the ratio between the total reference length of the selected cycle pattern and the size of the sewing area. The coefficient signal SK representing the sewing area is supplied to the data changing circuit 80, while the size of the sewing area is displayed on the numerical display 30.

In the above state, when the start/stop switch 40 is pressed, the motor control circuit 66 generates a start signal SST to start rotating the sewing machine motor 44. A clear signal with a predetermined pulse width is supplied from the one-shot multi-circuit 88 to the address counter 86 as a clear signal, so that the contents of the address counter 86 are cleared to zero. Therefore, the start address temporarily stored in advance at address zero of the pattern code memory 68 is supplied to the stitch data generator 70 via the channel selector 64, so that the first cycle pattern is first formed on the work cloth. Ru.

When the series of stitch signals generated to form this first cycle pattern reaches its end, the end signal SE is supplied from the stitch 1 data generator 70 to the address counter 86 via the OR circuit 82. Therefore, the address counter 86 changes the reading location of the pattern code memory 68 to address 1 by counting the signal. Therefore, the start address for forming the second cycle pattern is supplied from the pattern code memory 68 to the stitch data generator 70 via the channel selector 64, so that the second cycle pattern can be created following the first cycle pattern. A cycle pattern is formed on the processed fabric. In the above pattern forming process, the magnitude of the feed signal SF supplied from the stitch data generator 70 to the actuator drive circuit 74 is corrected in the data change circuit 80 according to the same operation as described above, so that the combined At the time of completion of sewing the kuru pattern, the total length of all the cycle patterns formed on the work cloth is inputted in advance.
This makes it possible to match the length of the production area. When the sewing of the combined cycle pattern is completed, the sewing machine motor is automatically stopped in the same manner as described above in accordance with the stitch number signal SN representing the total number of stitches.

In this way, according to this embodiment, the pattern selection switch 28
When a desired cycle pattern is selected, after pressing the 1-cycle designation switch 32, the size of the sewing area in which the cycle pattern is allowed to be formed is specified and input, so that the size of the sewing area and the sewing area on the workpiece cloth are specified. A cycle pattern of the same size is formed. Therefore, if you set the sewing start position to the sewing area, a cycle pattern of the same size as the sewing area will be automatically formed within that sewing area.
The cycle pattern protrudes from the sewing area or 11M
This completely eliminates uneven distribution within the area. Furthermore, the same effect can be obtained even when one cycle pattern is selected or when a plurality of cycle patterns are selected.

Although an embodiment of the present invention has been described below based on the drawings, the present invention can also be applied to other embodiments.

For example, in the block diagram of FIG. 2, part or all of the circuit surrounded by a dashed line may be configured by a so-called microcomputer. In addition, in the above-described embodiment, a signal changing circuit consisting of a reduction/enlargement ratio calculating circuit 58, a data changing circuit 80, etc. is provided to change the magnitude of the feed signal SF. In addition, in a sewing machine such as an industrial embroidery sewing machine in which the work cloth holder is moved relative to the sewing needle 18, such a signal changing circuit may be provided to change the magnitude of the signal representing the amount of relative movement. It may also be provided to change the brightness.

In addition, in the above-mentioned embodiment, in order to match the size of the cycle pattern formed on the work cloth with the sewing area, the size of the feed signal SF is multiplied by the reduction/enlargement ratio. has been reduced or enlarged as a whole, but for example, a series of stitch data to form a saicle pattern is composed of character data to form characters and space data to determine the spaces between characters. In this case, it is possible to make the cycle pattern formed on the work cloth coincide with the sewing area by changing only the space data. In such a case, there is an advantage that the shape of the character is not changed.

The above-mentioned embodiment is merely one embodiment of the present invention, and various modifications may be made to the present invention without departing from the spirit thereof.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the appearance of a sewing machine to which an embodiment of the present invention is applied. FIG. 2 is a block diagram showing the circuit configuration of the embodiment of FIG. 1. 18: Sewing needle 28: Pattern selection switch (designated operating body) Applicant: Brother Industries, Ltd.

Claims (1)

[Claims] (1) It is equipped with a stitch signal generating device that controls the relative position of the sewing needle and the work cloth in order to form each stitch in a cycle pattern of predetermined reference dimensions, and the cycle pattern is created according to the stitch signal. In a sewing machine that automatically stops the vertical and reciprocating movement of a sewing needle after completion of formation, there is provided a designation depth sewing body that can be manually operated to designate the size of a sewing area on a workpiece cloth in which the cycle pattern is formed; An electronic device comprising: a signal changing circuit that calculates a reduction/enlargement ratio of the pattern based on the size of the sewing area specified by the sewing object and the reference dimension, and changes the size of the stitch signal °C according to the reduction/enlargement ratio; sewing machine.