JPH0144349B2 - - Google Patents

Description

Detailed Description of the Invention Technical Field The present invention is directed to adjusting a stitch signal for forming a decorative pattern of a predetermined shape singly or continuously according to the operation of an operating section of an adjusting device. , relates to an electronically controlled sewing machine that changes the size of its decorative pattern.

Prior Art In general, in order to make it possible to form many types of patterns that differ in shape and size, and to match the size of the sewing location, the size of the decorative pattern is controlled by an operating unit in the direction of swinging of the sewing needle and in the direction of cloth feeding. A proportional change is made according to the operation of the
Changes in the size of the decorative pattern were permitted when the manual mode for adjusting the stitch signal value was set using the operation switch, and the operator could freely set the manual mode by operating the operation switch. .

However, when the manual mode is set by operating the operation switch during each decorative pattern forming cycle, the value of the stitch signal is adjusted according to the operation position of the operation section from that point on, and the size of the decorative pattern is adjusted. As a result, the overall shape of the decorative pattern for which the forming cycle was being executed at the time the operation switch was operated is distorted and becomes unsightly, resulting in a problem in that the sewing quality deteriorates.

Purpose The present invention was made to solve the above problems, and its purpose is to provide an electronically controlled sewing machine that can set a manual mode without destroying the overall shape of a decorative pattern.

SOLUTION In order to achieve the above object, the invention provides control means for permitting activation of the regulating device in connection with the end of each forming cycle of the decorative pattern. Therefore, the manual mode for adjusting the stitch signal is set in connection with the end of each forming cycle, and even if the operation switch is operated during the forming cycle, the stitch signal will not be adjusted until the end of that forming cycle. No adjustment operation is performed, and the decorative pattern formed at the time of the operation can be finished into a predetermined beautiful shape.

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

FIG. 1 shows the external appearance of the electronically controlled sewing machine of this embodiment. A feeding device that provides four-movement feed to the feed dog 14 is installed in the bed portion 12 of the sewing machine frame 10, and Inside the head 20 of the upper arm 18 extending leftward from the provided pillar portion 16 is a needle bar 2 that is capable of reciprocating up and down and swinging in the lateral direction.
2, and a sewing needle 24 is attached to the lower end of the needle bar 22. A large number of figures 26 representing a large number of patterns and a large number of light emitting diodes 28 indicating each figure are arranged in a row on the front surface of the upper arm 18, and a pattern selection button is operable to change the lighting position of the light emitting diodes 28. 30 is arranged on the front right side of the upper arm 18. A needle swing adjustment operation section 32 and a feed adjustment operation section are provided on the front surface of the pillar section 16, which are slidable in order to adjust and change the size of the pattern in the swing direction of the sewing needle 24 and the cloth feed direction of the feed dog 14. 34 are arranged vertically in parallel, and both operation parts 32,
A needle swing adjustment operation button 3 that can be operated to switch the operation mode between a manual mode that enables each of the 34 actions and an automatic mode that disables that action.
6 and a feed adjustment operation button 38 are provided, and light emitting diodes 40 and 42 are provided in the vicinity of both operation buttons 36 and 38, respectively, in order to display the operation mode set according to the operation of the operation buttons 36 and 38. There is.
In addition, a sliding speed setting operation section 44 is provided on the pillar section 1 in order to set the speed of a sewing machine motor (not shown).
An operation stop button 46 is disposed below the head 20 and is operable to command the operation and stop of the min motor.

Next, the electrical configuration of this embodiment will be explained with reference to FIG. 2.

The automatic return type pattern selection switch 48, which opens and closes in conjunction with the pattern selection button 30, generates a high-level operation signal PS when it is closed, and controls the pattern selection counter 5.
0, one terminal of the OR circuit 52, and the reset terminal RT of the D-type flip-flop 100, 102, which will be described later.
and supply each. The counter 50 performs a counting operation in response to the rise of the operation signal PS,
A pattern code signal PC, which is the counted content, is supplied to a display drive circuit 54, a leading address memory 56, and a pattern discrimination circuit 58, respectively. Display drive circuit 5
4 drives a pattern display device 29 consisting of a large number of light emitting diodes 28 according to the pattern code signal PC, and lights up one light emitting diode 28 corresponding to the pattern code signal PC. The start address memory 56 also sends a start address signal corresponding to each pattern to specify the address of a stitch data memory 60 (to be described later) in which the first stitch data in the stitch data group regarding each pattern is stored. One corresponding leading address signal is supplied to the preset terminal DT of the address counter 62 in accordance with the pattern code signal PC. The address counter 62
Loads the top address signal supplied to the preset terminal DT when the falling signal from the OR circuit 52 is applied to the load terminal LD, and detects the upper shaft when the sewing needle 24 reaches a predetermined position below the bed surface. Each time the signal TPF is received from the device 64, the count contents are sequentially advanced from the value of the first address signal. The count contents of the address counter 62 are supplied as an address signal to the stitch data memory 60 constituting the signal generating device. The stitch data stored in each address of the stitch data memory 60 is needle swing data.
It consists of DB and feed data DF, and at the end of the stitch data group for each pattern, special feed data indicating the end of the pattern forming cycle is stored. In order to detect whether the feed data outputted from the stitch data memory 60 is the above-mentioned special feed data, an end detection circuit 66 is provided as end detection means, and when the special feed data is detected, the high A level pulse signal EP is supplied to the other terminal of the OR circuit 52. Further, the needle swing data DB outputted from the stitch data memory 60 is applied to the latch 68, and the signal TPB outputted from the upper shaft detector 64 when the sewing needle 24 reaches a predetermined position above the bed surface.
The data held in the latch 68 is supplied to the D/A converter 70 and converted into the needle swing command voltage ASB. On the other hand, feed data DF directly output from stitch data memory 60 is supplied to D/A converter 72 and converted into feed command voltage ASF. In addition, the needle oscillation command voltage
A stitch signal is composed of ASB and feed command voltage ASF.

Both command voltages ASB and ASF are connected to the resistor voltage divider 7.
4 and 76 at a predetermined ratio and supplied to fixed contacts a of analog switches 78 and 80, both command voltages ASB and ASF are applied to the needle swing adjustment operation section 32 and the feed adjustment operation section 34. The voltage is adjusted by variable resistors 82 and 84 whose resistance values are changed in conjunction with the voltage, and is supplied to fixed contacts b of analog switches 78 and 80. analog switch 78,
80 is a fixed contact a and a movable contact c when a needle swing adjustment control signal MCB and a feed adjustment control signal MCF from a multiplexer 86, which will be described later, are in a low level state.
The fixed contact b and the movable contact c are connected when each control signal is at a high level, and the command voltage from each movable contact c is supplied to the actuator drive circuit 90. . The drive circuit 90 controls the power supplied to the needle swing actuator 92 and the feed actuator 94 according to the supplied command voltage, and thereby the sewing needle 24
The swing position of the feed dog 14 can be set, and the rotation position of the feed adjuster that controls the feed momentum and direction of the feed dog 14 can also be set. Note that the adjustment device for adjusting the stitch signal includes the operation sections 32 and 34 and the operation button 3.
6, 38, later-described operation switches 37, 39, variable resistors 82, 84, and analog switch 78,
It consists of 80.

Automatic return type operation switches 37 and 39 are provided which open and close in conjunction with the needle swing adjustment operation button 36 and the feed adjustment operation button 38, and when each operation switch is closed, a high level signal is sent to the T-type flip-flop 9.
6,98. Both flip-flops 9
Reference numerals 6 and 98 invert the holding state in response to the rising edge of the supplied signal, and the output signal is sent to the input port PA of the multiplexer 86, the input terminal D of the D-type flip-flops 100 and 102, and the light emitting diodes 40 and 42. are supplied respectively. D
The type flip-flops 100 and 102 constitute signal supply means, and hold the level of the signal supplied to their input terminal D in response to the pulse signal EP from the end detection circuit 66, and send the output signal to the multiplexer 86. Supplied to input port PB of
The multiplexer 86 outputs a high level discrimination signal DCS when the pattern discrimination circuit 58 discriminates the selection of a practical pattern such as a straight stitch or a zigzag stitch.
The input port PA is selected according to the pattern discrimination circuit 58, and the input port PB is selected in accordance with the low level discrimination signal DCS outputted when the pattern discrimination circuit 58 discriminates the selection of a decorative pattern such as a tulip pattern. .

The operation of this embodiment configured as described above will be described below.

First, when the pattern selection button 30 is operated to select a zigzag stitch, which is a practical pattern, the pattern discrimination circuit 5
8 outputs a high level discrimination signal DCS to cause the multiplexer 86 to select the input port PA. At the same time, the leading address signal corresponding to the zigzag stitch is supplied from the leading address memory 56 to the address counter 62 and loaded therein. Next, when the operator operates the stop button 46 to start the sewing machine, the upper shaft detector 64 outputs a signal TPF.
is output to advance the address counter 62,
Stitch data memory 60 sequentially outputs needle swing data DB and feed data DF. Both data are then converted into a needle swing command voltage ASB and a feed command voltage ASF through a latch 68 and D/A converters 70 and 72.

On the other hand, the T-type flip-flops 96 and 98, which are reset when the power is turned on to the sewing machine, send the low level signals to the selected input port PA of the multiplexer 86 as the needle swing adjustment control signal MCB and the feed adjustment control signal MCF. analog switch 78,
80 each. Low level control signal
According to MCB, MCF, analog switch 78,
80 is set to an automatic mode in which the fixed contact a and the movable contact c are connected, and supplies the command voltage divided by the resistive voltage dividers 74 and 76 to the actuator drive circuit 90. Drive circuit 90 drives actuators 92 and 94 to set the position of sewing needle 24 and feed adjuster so that each stitch of the zigzag stitch is formed in a predetermined position. Thereafter, when the prescribed forming cycle ZC of the zigzag stitch is completed and special feed data DF is output from the stitch data memory 60, the completion detection circuit 66 detects it and generates a pulse signal EP. Signal EP OR circuit 5
2 to the load terminal of the address counter 62 through
The head address signal corresponding to the zigzag stitch is supplied to the LD and is loaded into the counter 62 again. Therefore, the stitch data memory 60 can repeatedly output the stitch data group corresponding to the zigzag stitch formation cycle ZC, and the zigzag stitches are continuously formed.

Now, in order to change the needle swing width and feed amount in the zigzag stitch, press the needle swing adjustment operation button 36 and the feed adjustment operation button 38, and also press the needle swing adjustment operation section 32 and the feed adjustment operation section. When the switch 34 is slid, each of the operation switches 37 and 39 outputs a high level signal and the T-type flip-flop 9 is operated.
6 and 98 are set, and both flip-flops provide high level control signals MCB and MCF to analog switches 78 and 80 through input port PA of multiplexer 86. analog switch 78,
80 is a variable resistor 82 which is switched to manual mode by connecting fixed contact b and movable contact c in accordance with a high-level control signal, and whose resistance value is set according to the operating position of the operating parts 32 and 34; The command voltage divided and adjusted by 84 is applied to the actuator drive circuit 90.
supply to. Therefore, each stitch of the zigzag stitch is sequentially formed at a changed position as shown in FIG. 3 by the adjusted command voltage. In addition, since the overall shape of practical patterns is rarely disturbed by adjustments made during the forming cycle, adjustments to zigzag stitches are made during the forming cycle as shown in Figure 3.
Even in ZC, it is immediately activated from the time the operation buttons 36 and 38 are operated.

Now, when the pattern selection button 30 is operated to change from a zigzag stitch to a tulip pattern, which is a decorative pattern, the pattern discrimination circuit 50 determines the selection of a decorative pattern and outputs a low level discrimination signal DCS to the multiplexer 86. In addition to selecting input port PB,
D-type flip-flops 100 and 102 are operation signals.
It is reset by PS and outputs a low level signal. Further, the address counter 62 receives the start address signal corresponding to the tulip pattern from the start address memory 56 and becomes in a state where it can specify the stitch data group corresponding to the formation cycle RC of the tulip pattern in the stitch data memory 60. . Subsequently, when the operation buttons 36 and 38 are operated to form a tulip pattern in a predetermined shape and size, the T-type flip-flops 96 and 98 are reset and output low-level control signals MCB and MCF. . On the other hand, the D-type flip-flop 100,
Since the needle 102 has been reset as described above, it supplies a low level signal to the analog switches 78 and 80 via the input port PB of the multiplexer 86 as the needle swing adjustment control signal MCB and the feed adjustment control signal MCF. , both switches are switched to an automatic mode that connects fixed contact a and movable contact c.

Here, when the sewing machine is started to form a tulip pattern, each data in the stitch data group corresponding to the tulip pattern is detected by the signal TPF from the upper axis detector 64, similar to the zigzag stitch described above. The needle swing data DB and feed data DF, which are sequentially output from the stitch data memory 60 and make up the stitch data, are converted into command voltages ASB and ASF by the D/A converters 70 and 72, and both command voltages are divided by the resistance component. The voltage is divided by voltage regulators 74 and 76 and supplied to actuator drive circuit 90 via analog switches 78 and 80. As a result, a tulip pattern P1 of a predetermined shape and size is formed as shown in FIG. , the tulip pattern P1 is repeatedly and continuously formed, similar to the zigzag stitch described above.

Tulip pattern P1 of predetermined shape and size
In order to adjust the resistance of the variable resistors 82, 84 in the swinging direction of the sewing needle 24 and in the cloth feeding direction of the feed dog 14, the operating buttons 36, 38 are pressed and the operating sections 32, 34 are slid. When the value is set, the T-type flip-flops 96 and 98 are set by the high-level signals from the operating switches 37 and 39, and the high-level signals are transferred to the D-type flip-flop 1.
00, 102 input terminal D. Both flip-flops 100, 102 are operated by operating buttons 36,
38 is operated, the level of the input signal at the input terminal D is held in response to the pulse signal EP first output from the end detection circuit 66, and the high level signal is sent to the control signal MCB, MCB, through the multiplexer 86.
It is supplied to analog switches 78 and 80 as MCF. As a result, both switches 78 and 80 are switched to manual mode and supply the adjusted command voltage from variable resistors 82 and 84 to actuator drive circuit 90, and the magnitude is changed as shown in FIG. A tulip pattern P2 is formed. In this case, the tulip pattern, which is a decorative pattern, is similar to the zigzag stitch, which is a practical pattern, using the operation buttons 37 and 39.
The manual mode is not set and adjusted from the time of the operation, but the manual mode is set and the adjustment operation is started after the pattern formation cycle RC is completed.

On the contrary, in the manual mode, the operation buttons 37 and 39 are pressed during the formation cycle RC of the tulip pattern P2.
is operated to reset the T-type flip-flops 96, 98, the pulse signal generated from the completion detection circuit 66 at the end of the formation cycle RC
In response to EP, a D-type flip-flop 100,
102 maintains a low level signal at its input terminal D to switch analog switches 78, 80 from manual mode to automatic mode. As a result, the tulip pattern P2 whose size has been adjusted is
After the tulip pattern P1 is formed until the end of RC, formation of the tulip pattern P1 of a predetermined shape and size is started.

The present invention is not limited to the embodiments described above, and various changes can be made without departing from the spirit thereof.

For example, in this embodiment, a decorative pattern such as a tulip pattern is formed continuously, and a memory is provided to store stitch number data representing the total number of stitches in the forming cycle of the decorative pattern. The sewing machine may be configured to automatically stop when the number of stitches have been formed and a single decorative pattern has been sewn, in which case the adjustment of the decorative pattern is effective after the formation of the single pattern. be converted into

In this embodiment, special feed data representing the end of the pattern forming cycle is stored in the stitch data memory 6.
The end detection circuit 6 stores the data as 0 and stops generating the data.
6, the pulse signal EP is generated by detecting that a number of stitches have been formed according to the stitch number data.
A configuration that generates EP may also be used.

Further, the portion surrounded by a dashed line in FIG. 2 can be partially or completely replaced by a microcomputer.

Effects As is clear from the above detailed description, the present invention provides a control means for permitting the operation of the adjustment device in connection with the completion of each decorative pattern forming cycle, so that the decorative pattern can be adjusted during each decorative pattern forming cycle. The size of the pattern can be changed while maintaining the beauty of the overall shape of the pattern by preventing the size from being adjusted or changed. In addition, the operation switch can be operated to switch from a standard decorative pattern of a predetermined shape and size to an adjusted decorative pattern, or from the adjusted decorative pattern to the standard decorative pattern while the sewing machine is operating. This makes it easy to carry out the process, and allows both patterns to be beautifully formed in succession, thereby improving the ease of use of the sewing machine and making it possible to create high-quality sewn products.

[Brief explanation of drawings]

FIG. 1 is an external view showing an embodiment of the electronically controlled sewing machine of the present invention, FIG. 2 is a block diagram showing the electrical configuration of this embodiment, and FIGS. 3 and 4 are zigzag stitch and tulip patterns. It is an explanatory view showing a formation state of. 14: Feed dog, 24: Sewing needle, 32: Needle swing adjustment operation section, 34: Feed adjustment operation section, 37, 39: Operation switch, 60: Stitch data memory, 66: End detection circuit, 78, 80: Analog Switch, 8
2, 84: variable resistor, 100, 102: D-type flip-flop.

Claims (1)

[Scope of Claims] 1. A signal generating device that generates a stitch signal for each stitch in a decorative pattern in order to form a decorative pattern of a predetermined shape singly or continuously; an adjustment device having an operation section operable to adjust the value of the eye signal, and generating a stitch signal having a value adjusted by the operation section in order to change the size of the decorative pattern; An electronically controlled sewing machine comprising: a control means for permitting operation of the adjustment device in connection with the completion of each forming cycle of the decorative pattern.