JPS6157035B2 - - Google Patents

Description

[Detailed description of the invention]

TECHNICAL FIELD The present invention relates to an electronic sewing machine that forms a desired stitch pattern based on a pre-stored reference stitch formation signal, and particularly to an electronic sewing machine that forms a stitch pattern larger than the stitch pattern represented by the reference stitch formation signal. This article relates to an electronic sewing machine. BACKGROUND OF THE INVENTION An electronic sewing machine is equipped with a storage device in which a reference stitch formation signal is stored in advance, and a desired stitch pattern is formed in accordance with the reference stitch formation signal. The reference stitch formation signal is normally determined so that the size of the stitch pattern formed in accordance with the reference stitch formation signal is a standard size that is most frequently used in practice. However, there are times when it is necessary to form a stitch pattern larger than the stitch pattern formed in accordance with the reference stitch formation signal. In such cases, it is not possible to perform the sewing work using the conventional electronic sewing machine, and it is necessary to use another special sewing machine. On the other hand, in a normal electronic sewing machine, if a stitch forming signal that can form a large stitch pattern as described above is stored in advance, a large capacity memory for storing the stitch forming signal is required. A storage device must be provided. In addition, when attempting to form a large stitch pattern by amplifying the analog signal at the stage of supplying an analog signal to the actuator for swinging the sewing machine needle or driving the work cloth feed adjuster, , the amplification factor must be changed for each stitch pattern, and the device for signal amplification becomes complicated and large. Therefore, in these cases, the configuration of the electronic sewing machine becomes complicated and the electronic sewing machine becomes expensive. Purpose The present invention has been made against the background of the above-mentioned circumstances, and its purpose is to form a seam by using the standard seam formation signal as it is based on a reference seam formation signal stored in advance. To provide an electronic sewing machine capable of forming a stitch pattern larger than a standard stitch pattern (hereinafter referred to as a reference stitch pattern) with a simple configuration and at low cost. Solution To achieve the above object, the electronic sewing machine of the present invention includes: (1) a needle capable of reciprocating up and down; (2) a feed dog that performs a feed motion in synchronization with the up and down reciprocation of the needle; 3) At least one of a swing position setting mechanism for setting the horizontal swing position of the needle and a feed adjustment position setting mechanism for setting the adjustment position of a feed adjuster that controls the feed movement of the feed dog. a position setting mechanism; (4) a signal generator capable of generating a reference stitch formation signal in synchronization with the vertical reciprocating movement to control the position setting mechanism to form a plurality of types of stitch patterns; ) a magnification storage device that stores a magnification signal representing an increase magnification determined corresponding to each of the plurality of types of stitch patterns in order to create a seam formation signal larger than the reference seam formation signal; ) a pattern selection device that generates a pattern code signal corresponding to the desired pattern in order to select the desired pattern from among the plurality of stitch patterns; (7) the reference stitch for forming the desired pattern; an operation for activating an eye formation signal in accordance with the pattern code signal and generating it from the signal generating device; and reading out the magnification signal corresponding to the desired pattern from the magnification storage device in accordance with the pattern code signal. (8) an arithmetic and control unit that performs an operation for creating an increased stitch formation signal based on the generated reference stitch formation signal and the read magnification signal; (8) a pattern to be formed; (9) a manual adjustment device that manually adjusts the increased stitch formation signal in order to change the magnitude of the stitch formation signal; a signal selection device for selecting either one; (10) a drive control device for controlling the position setting mechanism in accordance with the stitch forming signal selected by the signal selection device; Ru. Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on the drawings. In Figure 1, the sewing machine frame has a base part 2.
A pedestal part 4 is provided upright on the base part 2, a head part 6 is formed at one end, and the pedestal part 4 is formed at the other end.
It consists of an arm portion 8 supported horizontally by. The lower end of the head 6 is moved up and down by a vertical drive mechanism (not shown), and the amount of swing is determined by a swing position setting mechanism (not shown) including a needle swing actuator 10 (described later). A needle 12 is provided which can be moved in a oscillating manner, and a base portion 2 at a position below the needle 12 is provided.
is provided with a feed dog 16 whose cloth feed amount and cloth feed direction are adjusted in accordance with a feed adjuster positioned by a feed adjustment position setting mechanism (not shown) including a feed actuator 14 (described later). Through the cooperation of the needle 12 and the feed dog 16, a stitch pattern is formed on the workpiece cloth. A start/stop push button 18 for starting and stopping the sewing machine is provided on the lower front surface of the head 6, and a pattern selection device 20 is provided on the front surface of the arm portion 8. The pattern selection device 20 includes a pattern display board 2 on which a plurality of pattern symbols 22 representing stitch patterns are formed.
4, and a plurality of LEDs 26 arranged correspondingly above the pattern symbol 22,
These patterns include pattern selection switches 28 and 30 that can move the lighting position of the LED 26 to the right and left.
A desired stitch pattern is selected according to the operations 8 and 30. At the lower front of the pillar section 4, there is a swing adjustment knob 32, which is a manual adjustment device for adjusting the amount of swing of the needle 12, and a feed dog 1 in order to change the size of the stitch pattern.
A feed adjustment knob 34 which is a manual adjustment device for adjusting the cloth feed amount of 6 is provided. And, these are the swing adjustment knob 32 and the feed adjustment knob 34.
For the pillar section 4 located at the upper position, either a signal adjusted to a desired size using the manual adjustment device or a reference stitch formation signal stored in advance in the sewing machine without any adjustment is selected. A manual/automatic changeover switch 36, which is a signal selection device, is provided to select the desired signal. The sewing machine configured as described above is provided with a circuit device shown in FIG. 2. The pattern selection device 20 described above is equipped with a decoder (not shown), and the pattern selection switch 2
A pattern code signal SM representing the stitch pattern selected by the operations 8 and 30 is output from the decoder to the encoder 38. This encoder 38 stores the start address of each reference stitch formation signal group stored in a stitch formation data memory 40, which is a signal generation device to be described later, and the changed magnification data memory 42, which is a magnification storage device. The address of the magnification signal represented by the pattern code signal SM is stored, and the start address signal SHD representing the start address is output to the address counter 44 in correspondence with the stitch pattern represented by the pattern code signal SM. Address signal SMD is output to change magnification data memory 42. Also, a pattern selection operation signal AKD representing the input of the pattern code signal SM
is output from the encoder 38 to the input terminal LD of the address counter 44 via the OR circuit 46. On the other hand, the timing pulse generator 48 generates a timing signal in synchronization with the rotation of the main shaft of the sewing machine (not shown).
The timing signal ST is output to the input terminal CK of the address counter 44. In the address counter 44, the head address signal SHD is loaded according to the signal supplied to its input terminal LD, and in addition to this, the signal supplied to its input terminal CK is counted.
Stitch formation address signal indicating the content of this count
The SAD is finally output to the stitch formation data memory 40. In the stitch formation data memory 40, in order to form a desired stitch pattern selected by the pattern selection device 20, a group of reference stitch formation signals respectively corresponding to the stitch patterns are stored and inputted. The reference stitch formation signals are sequentially output in accordance with the stitch formation address signal SAD. That is, this reference stitch forming signal determines the individual stitch positions, and is composed of a pair of needle position signal SN and feed position signal SF, respectively. SF is the timing signal
The stitch forming data memory 40 is output to the arithmetic circuit 50 in synchronization with ST, and the needle position signal SN is output to the termination determining circuit 52. In the termination determination circuit 52, the needle position signal SN
When the content of is the final signal of the reference stitch forming signal group for forming one stitch pattern, the termination signal SE is outputted to the input terminal LD of the address counter 44 via the OR circuit 46. On the other hand, in the change magnification data memory 42,
In order to create a stitch formation signal having a larger content than the reference stitch formation signal, change magnifications corresponding to the desired stitch patterns selected in the pattern selection device 20 are stored, and the input pattern code A magnification signal representing a change magnification corresponding to the stitch pattern represented by the signal SM is output to the arithmetic circuit 50.
This magnification signal is a needle position magnification signal MN representing the change magnification of the swinging direction of the needle 12 and a change magnification of the cloth feeding direction.

It is composed of a feed position magnification signal MF representing [Table]. Such change magnification is determined for each stitch pattern, for example, as shown in Table 1. The manual/automatic changeover switch 36 outputs a selection signal SS indicating either manual or automatic according to its switching position, and the selection signal SS is outputted to the arithmetic circuit 50 and analog switches 54 and 56. . In the arithmetic circuit 50, when the content of the selection signal SS supplied from the manual automatic changeover switch 36 is automatic, the inputted needle position signal SN and feed position signal SF are output to D/A converters 58 and 60, respectively. At the same time, when the content of the selection signal SS is manual, the needle position signal SN and the feed position signal
The contents of SF are multiplied according to the magnification represented by the needle position magnification signal MN and the feed position magnification signal MF, and the increased needle position signal SMN and increased feed position signal SMF, which are increased stitch formation signals obtained as a result of this multiplication, are D/
The signals are output to A converters 58 and 60, respectively. In this way, the above-mentioned encoder 38, address counter 44, OR circuit 46, termination determination circuit 52
The arithmetic circuit 50 converts the needle position signal SN and feed position signal SF for forming the desired stitch pattern selected by the pattern selection device 20 into a pattern code signal.
Activate according to SM and stitch formation data memory 40
and the needle position magnification signal MN and feed position magnification signal corresponding to the desired stitch pattern.
Operation for reading MF from change magnification data memory 42 according to pattern code signal SM, needle position signal SN, feed position signal SF, and needle position magnification signal MN
and the feed position magnification signal MF, an arithmetic and control device 61 is formed which performs the operation of creating an increased needle position signal SMN and an increased feed position signal SMF based on the feed position magnification signal MF. In the D/A converter 58, the input signal is converted into a voltage signal which is an analog signal.
The signal is supplied to the analog switch 54 and the other terminal of a potentiometer 62 which is linked to the swing adjustment knob 32 and has one terminal grounded. The analog switch 54 has its common terminal connected to the drive control circuit 64 connected to either the output terminal of the D/A converter 58 or the output terminal of the potentiometer 62 according to the selection signal SS. When the content of the selection signal SS is automatic, the output signal of the D/A converter 58 is supplied as is to the drive control circuit 64, and when the content of the selection signal SS is manual, the output signal of the D/A converter 58 is supplied to the drive control circuit 64 as is. The output signal of the A converter 58 is sent to the drive control circuit 64 via the potentiometer 62.
is supplied to Then, a power signal corresponding to the input signal is output from the drive control circuit 64 to the needle swing actuator 10, and the swing position setting mechanism including the needle swing actuator 10
oscillate. That is, the swing adjustment knob 32
Only when the automatic manual changeover switch 36 is switched to manual, the magnitude of the increased needle position signal SMN can be manually adjusted, thereby adjusting the amount of swing of the needle 12. The manual/automatic changeover switch 36 can select the signal supplied to the drive control circuit 64 to be either the needle position signal SN or the increased needle position signal SMN. A feed adjustment knob 34 is provided between the D/A converter 60 and the feed actuator 14 in the same way as between the D/A converter 58 and the needle swing actuator 10.
It is composed of a potentiometer 66, an analog switch 56, and a drive control circuit 68 that are interlocked with each other. The operation of this embodiment will be explained below. When a power switch (not shown) is turned on and automatic is selected in the manual/automatic changeover switch 36, when a desired stitch pattern, for example, a three-point zigzag stitch pattern, is selected by the pattern selection device 20, this Based on the pattern code signal SM representing the three-point zigzag stitch pattern, the head address signal SHD and the magnification address signal SND are sent to the address counter 44 and the change magnification data memory 42.
From this change magnification data memory 42, a needle position magnification signal MN representing a change magnification of 2 and a feed position magnification signal MF representing a change magnification of 1.5 are supplied to an arithmetic circuit 50. At the same time, the pattern selection operation signal
AKD is supplied to the address counter 44, and this address counter 44 receives the head address signal SHD.
is loaded. In this state, when the start/stop push button 18 is operated to rotate the main shaft of the sewing machine (not shown), the timing signal ST supplied from the timing pulse generator 48 is counted by the address counter 44, and a stitch is formed representing the count contents. The address signal SAD is finally supplied to the stitch formation data memory 40. Therefore, the seam formation address signal
A group of needle position signals SN and feed position signals SF for forming the three-point zigzag stitch pattern specified by the SAD are sequentially supplied from the stitch formation data memory 40 to the arithmetic circuit 50, and the selection signal at this time Since the contents of SS indicate automatic, the needle position signal SN and feed position signal SF are supplied to the D/A converters 58 and 60 as they are. The analog switches 54 and 56 at this time are
As shown in FIG. 2, the output terminals of the D/A converters 58 and 60 are switched in accordance with the selection signal SS, so that the needle position signal SN and feed position signal SF converted into voltage signals are The signal is supplied directly from the D/A converters 58 and 60 to the drive control circuits 64 and 68 to set the swing position of the needle 12 and the adjustment position of the feed regulator. Such an operation is performed every time the timing signal ST is generated, and as shown in AUTO in Table 1, the magnitude of the swing direction of the needle 12 when forming each stitch is
One unit of three-point zigzag stitch pattern is formed, with a width of 2.5 mm and a size of 1 mm in the feed direction of the work cloth. At the end of forming one unit of three-point zigzag stitch pattern, the termination signal SE is output to the termination determination circuit 5 according to the final signal of the group of needle position signals SN.
2 to the address counter 44, and the address counter 44 is reloaded with the head address signal SHD. Therefore, as the main shaft of the sewing machine is rotated in accordance with the same operation as described above, a three-point zigzag stitch pattern is continuously formed in the feed direction of the work cloth. This is the standard stitch pattern. Next, when manual is selected by the automatic manual changeover switch 36, the selection signal SS indicates manual, so the arithmetic circuit 50 and analog switches 54 and 5 in the above description of operation are selected.
The operation will be different from that of 6. That is, when the needle position signal SN and feed position signal SF for forming a three-point zigzag stitch pattern are sequentially supplied from the stitch formation data memory 40 to the arithmetic circuit 50, this arithmetic circuit outputs the needle position magnification signal MN. and the feed position signal MF, and an increased needle position signal SMN obtained by multiplying the needle position signal SN by 2 is sequentially supplied to the D/A converter 58, and the feed position signal SF is multiplied by 1.5 times. The multiplied increased feed position signal SMF is sequentially supplied to the D/A converter 60. At this time, the analog switches 54 and 56 switch the potentiometers 62 and 66 according to the selection signal SS.
Since the increased needle position signal SMN and increased feed position signal SMF converted into analog signals are switched to the potentiometers 62 and 6,
6 to drive control circuits 64 and 68, respectively. Therefore, the drive control circuit 64
The magnitudes of the increased needle position signal SMN and the increased feed position signal SMF supplied to Needle 1 in each stitch formation as shown in the manual
A three-point zigzag seam pattern is formed as a unit pattern whose size is adjusted to a desired size in the range of 0 to 5 mm in the swing direction of step 2 and 0 to 1.5 mm in the feed direction of the work cloth. It is. In the pattern selection device 20, even when other stitch patterns such as a straight stitch, an overlock stitch pattern, and a blind stitch pattern are selected, the automatic and manual operations in Table 1 are performed according to the same operation as described above. Stitch patterns of the sizes shown can be respectively formed by operating the signal selection device. As described above, according to this embodiment, an increased stitch formation signal is created according to calculations based on a pre-stored general-purpose reference stitch formation signal and a magnification signal, and this increased stitch formation signal is used to create an increased stitch formation signal. It is possible to form a stitch pattern larger than the standard stitch pattern required for each type of stitch pattern. Therefore, there is no need to store in advance the increased stitch formation signal required for each type of stitch pattern, so there is no need for a large-capacity storage device, and the general-purpose storage device that stores the normal reference stitch formation signal can be used. Furthermore, there is no need to provide a complicated and large-sized signal amplification device that operates at different amplification factors for each type of stitch pattern. That is, an electronic sewing machine capable of forming a stitch pattern larger than a standard stitch pattern can be economically provided by a simple configuration in which a small-capacity magnification signal is stored in an ordinary electronic sewing machine and a calculation function is added. Therefore, when forming a stitch pattern larger than the standard stitch pattern, there is no need to use another special sewing machine. 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. For example, in the embodiment described above, a swing position setting mechanism for setting the swing position of the needle 12 and a feed adjustment position setting mechanism for setting the adjustment position of the feed adjuster that controls the movement of the feed dog 16 are provided. However, either one of these position setting mechanisms may be provided. Further, the above-mentioned arithmetic and control device 61 can be partially or completely included in a so-called microcomputer. Effects As detailed above, according to the present invention, it is possible to provide an electronic sewing machine that can form a stitch pattern larger than a reference stitch pattern at low cost with a simple configuration based on a reference stitch formation signal. This produces an effect that can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the appearance of a sewing machine that is an embodiment of the present invention. FIG. 2 is a block diagram showing the circuit configuration of the embodiment of FIG. 1. 12... Needle, 16... Feed dog, 20... Pattern selection device, {32... Swing adjustment knob, 34... Feed adjustment knob} (manual adjustment device), 36... Manual automatic changeover switch (signal selection device), 40... Stitch formation data memory (signal generation device), 42... Change magnification data memory (magnification storage device), 61...
Arithmetic control unit, 64, 68...drive control circuit (drive control device), {SN...needle position signal, SF...feeding position signal} (reference stitch formation signal), {MN...needle position magnification signal, MF...Feed position magnification signal} (magnification signal), SM...Pattern code signal.

Claims (1)

[Scope of Claims] 1. A needle capable of vertical reciprocating motion, a feed dog that performs a feeding motion in synchronization with the vertical reciprocating motion of the needle, and a swing position setting for setting the horizontal swing position of the needle. a position setting mechanism for at least one of the mechanism and a feed adjustment position setting mechanism for setting the adjustment position of a feed adjuster that controls the feed motion of the feed dog; and the position setting mechanism for forming a plurality of types of stitch patterns. a signal generator capable of generating a reference stitch formation signal for controlling a mechanism in synchronization with the vertical reciprocating motion; a magnification storage device for storing a magnification signal representing an increase magnification determined corresponding to each of the plurality of stitch patterns; and a pattern code corresponding to the desired pattern for selecting the desired pattern from among the plurality of types of stitch patterns. a pattern selection device that generates a signal; an operation for activating the reference stitch formation signal for forming the desired pattern according to the pattern code signal and causing the signal generation device to generate the signal;
an operation for reading out the magnification signal corresponding to the desired pattern from the magnification storage device according to the pattern code signal, and based on the generated reference stitch forming signal and the read magnification signal. an arithmetic and control unit that performs an operation of creating an increased stitch formation signal; a manual adjustment device that manually adjusts the increased stitch formation signal in order to change the size of the pattern to be formed; a signal selection device for selecting either a stitch formation signal or a reference stitch formation signal generated from the signal generating device; and a signal selection device for setting the position according to the stitch formation signal selected by the signal selection device. An electronic sewing machine including a drive control device for controlling a mechanism.