JPS6366225B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an automatically controlled sewing machine that can selectively perform a plurality of predetermined types of sewing machine operations.

Prior Art Conventionally, in general, when multiple predetermined types of sewing machine operations such as needle down stop, backstitching, reverse stitching, etc. are to be executed all at once, a large number of touch switches are provided on the sewing machine frame corresponding to the various sewing machine operations. By operating the switches such as the above, the selected sewing machine operation was executed. However, most of the operation parts that uniformly select the various sewing machine operations are made of contact points, and are therefore inferior in durability and reliability. For example, touch switches have problems in durability and reliability because they are connected to the touch switch using a finger or the like. On the other hand, in the case of a non-contact device, for example, in the case of an operation section using a photoelectric conversion means, the structure is complicated and expensive.

In addition, since these operating sections are arranged in rows with the number of sewing machine operations protruding above the sewing machine frame, the proportion of the operating sections on the sewing machine frame becomes large, and the installation structure and electrical There was a problem that the configuration became complicated.

Purpose This invention has been made in order to solve the above-mentioned problems, and its purpose is to make the operation section for uniformly selecting various sewing machine operations non-contact and simple in structure. is to provide automatic control sewing machines.

Embodiment Hereinafter, an embodiment in which the present invention is embodied in a pattern sewing machine will be described with reference to the drawings.

In FIG. 1, a sewing machine frame 1 is composed of a bed 2 and a bracket arm 3, and the bracket arm 3 has a pillar part 3a, an intermediate part 3b, and a head part 3.
It starts with c. A needle bar 4 with a sewing needle 4a attached to its lower end is supported in the head 3c so as to be movable up and down and swingable in conjunction with the main shaft of the sewing machine, and a thread ring catcher provided in the bed 2 is supported. In cooperation with the above, various types of seams are now formed on processed fabrics. Further, a presser bar 5 having a presser foot 5a attached to its lower end is provided on the head 3c so as to be movable up and down.

A feed dog (not shown) connected to a well-known cloth feeding mechanism is provided in the bed 2 so as to face the presser foot 5a so as to be movable onto the bed 2 in conjunction with the main shaft of the sewing machine. In cooperation with 5a, feed is applied to the work cloth.

On the other hand, on the front surface of the intermediate portion 3b of the bracket arm 3, a large number of figures 6 of various stitch patterns are displayed in the longitudinal direction, and above the figures 6, a pattern display panel 8 in which light emitting diodes 7 are arranged in rows is arranged. It is provided. An automatic return type pattern selection switch 9 is provided on the right side of the pattern display panel 8, and when pressed, the selected stitch pattern image 6 is indicated by the lighting of the light-emitting diode 7 above it. It becomes possible to sew a seam pattern. A sewing machine motor 40, which will be described later, is provided in the pillar portion 3a of the bracket arm 3, and three holding type speed setting switches (for low speed, medium speed, and high speed operation from the left) are provided to set the rotational speed of the motor 40. 10, 11, 12
is provided on the lower front side of the pillar portion 3a.

The operation frame 14 is fitted into the front surface of the head 3c in a longitudinal direction, and has four finger insertion holes 15 formed therein as shown in FIG. 2, and defines operation areas D1 to D4, which will be described later. As shown in FIG. 3, support frames 1 are provided as a pair of upper and lower support points at the rear of both sides of the operation frame 14.
6 and 17 are provided, one end of which is fixed to the head 3c, respectively. The bending portions 18a and 18b at both ends of the operation plate 18 are connected to the support frames 16 and 17.
is fixed to the tip support surface of the The front surface of the operation plate 18 has four operation areas D1 to D4 corresponding to the finger insertion holes 15 of the operation frame 14, and the area D1 has sewing machine operations of needle up stop and needle down stop. Characters 19 instructing the operation of the sewing machine for backstitching in area D2, characters 20 instructing the sewing machine operation for backstitching in area D2, characters 21 instructing the sewing machine operation for backstitching in area D3, and characters 22 instructing to start and stop the sewing machine in area D4. is displayed. And these areas D
By selecting and pressing 1 to D4, the sewing machine operation corresponding to the instruction displayed in the pressed area can be selected. At this time, when the desired operation areas D1 to D4 are pressed, the operation plate 18
The ratio of the pressure applied to the bent parts 18a, 18b, that is, the ratio of the amount of deflection of the bent parts 18a, 18b, is independent of the pressing force, and the distance from the pressing position P to the bent part 18b in the pressed operation area L.B.
is equal to the ratio of the distance LA from the pressing position P to the bent portion 18a.

A first resistance wire strain gauge 23 serving as a detection element is attached to the inner surface of the upper bent portion 18a, and its resistance value increases relative to the amount of deflection of the upper bent portion 18a. A second resistance wire strain gauge 24, which also serves as a detection element, is connected to the lower bent portion 18.
It is attached to the inner surface of the bent portion 18b, and its resistance value increases relative to the amount of deflection of the bent portion 18b. The ratio between the resistance value of the first resistance wire strain gauge 23 and the resistance value of the second resistance wire strain gauge 24 is determined by the upper bent portion 18.
The ratio of the amount of deflection of a to the amount of deflection of the lower bent portion 18b is made equal to the ratio.

In FIG. 1, four light emitting diodes 25 provided on the right side of the operation frame 14 are connected to the operation frame 1, respectively.
The light-emitting diodes 25 corresponding to the pressed operation areas D1 to D4 are arranged in positions corresponding to the finger insertion holes 15 of No. 4, and light-emitting diodes 25 corresponding to the pressed operation areas D1 to D4 are turned on based on the pressing operation of the operation plate 14.

Next, the electrical circuit of the pattern sewing machine constructed as described above will be explained with reference to FIG.

In FIG. 4, a bridge circuit 31 as a detection circuit is composed of resistors R1 and R2 and the first and second resistance wire strain gauges 23 and 24, and a resistor R
1 and the resistance value of the resistor R2 are set to be equal. This bridge circuit 31 has a resistor R
1 and the connection point a of the first resistance wire strain gauge 23,
A constant voltage E is applied between the resistor R2 and the connection point b of the second resistance wire strain gauge 24, and the resistor R1 is , R2 and the connection point d between both strain gauges 23 and 24 are supplied to the differential amplifier 32 as electrical signals. Then, this differential amplifier 32 outputs a differential voltage Eout between these two voltages.

Therefore, this differential voltage Eout becomes 0V when the operation plate 18 is not pressed because the ratio of the resistance values of the strain gauges 23 and 24 is 1, and when it is pressed, it becomes 0V as shown in FIG. Operation panel 18
It is determined based on the ratio of the resistance values of the strain gauges 23 and 24 that change relative to the pressed position P in each of the operation areas D1 to D4. In addition, at this time, the operation panel 1
Since the central position of 8 cannot be pressed by the operation frame 14, the ratio of the resistance values of both strain gauges 23 and 24 will not become 1 when the operation plate 18 is pressed. The A/D converter 33 converts the differential voltage Eout from the differential amplifier 32 into a digital signal.
Convert to SG1 and output.

The pattern selection device 34 includes the pattern selection switch 9, and outputs a code signal SG2 corresponding to a desired stitch pattern based on the operation of the switch 9. The signal generation circuit 35 inputs the digital signal SG1 from the A/D converter 33, and outputs the digital signal SG1.
The pressing position P of the operation panel 18 is determined based on the digital value of
Calculate. When the signal generating circuit 35 determines the pressed position P, it first determines to which operating area among the four operating areas D1 to D4 the pressed position P belongs. When the signal generating circuit 35 determines that the pressed position P is the operating area D1, it reverses the first flip-flop circuit built in the circuit 35, and if the flip-flop circuit is in the reset state, it moves the sewing needle 4a to the needle-up position. In addition, in the set state, an operation command signal SG3 is output to a motor drive circuit 36 which controls the drive of the sewing machine motor 40 so as to stop the sewing needle 4a at the needle down position.
While determining the pressing position P as the operation area D2, the signal generating circuit 35 operates as a feed and needle drive unit connected to the fabric feed mechanism and the needle swing mechanism, respectively, so that the sewing machine immediately performs the tacking operation. Tack stitch operation command signals SG4 and SG5 are outputted to the feed drive circuit 37 and the needle swing drive circuit 38, which drive and control the swing actuators 41 and 42, in synchronization with the sewing machine operation. While the pressing position P is determined to be the operation area D3, the signal generation circuit 35 sends reverse stitching operation command signals SG4 and SG5 in synchronization with the sewing machine operation so that the sewing machine immediately performs the reverse stitching operation to the drive circuit 37 and the needle. It is output to the swing drive circuit 38.
Further, when the pressed position P is determined to be the operation area D4, the signal generating circuit 35 reverses the second flip-flop circuit built in the circuit 35, and stops the sewing machine motor 40 if the flip-flop circuit is in the reset state. , and in the set state, an operation command signal is sent to drive the sewing machine motor 40.
SG6 is output to the motor drive circuit 36.

Further, the signal generation circuit 35 is connected to the pattern selection device 3.
A pattern code signal SG2 is input from 4, and based on the code signal SG2, display control is performed on the pattern display device 39 including each light emitting diode 25 in order to light up the light emitting diode 7 corresponding to the stitch pattern selected by the pattern selection switch 9. Outputs signal SG7. When the tacking stitch and reverse stitching are not commanded, operation command signals SG4 and SG5 are sent to the feed drive circuit 37 and the needle in synchronization with the sewing machine operation to command cloth feed and needle swing to form the selected stitch pattern. It is configured to output to the swing drive circuit 38.

Next, the operation of the pattern sewing machine configured as described above will be explained.

Now, when the power switch is turned on, the first and second flip-flop circuits of the signal generation circuit 35 are reset. At this time, based on the fact that the first flip-flop circuit is in the reset state, the signal generation circuit 35 outputs an operation command signal SG3 to the motor drive circuit 36 so that the sewing needle 4a is stopped above the needle when the sewing machine motor is stopped. do. Next, after operating the pattern selection switch 9 to select a desired stitch pattern, when the position of the operation area D4 of the operation panel 18 is pressed, an electric signal corresponding to that area D4 is output from the bridge circuit 31, and the differential It is output to the amplifier 32. The differential voltage Eout output from the amplifier 32 is output to the signal generation circuit 35 via the A/D converter 33. As a result, the signal generation circuit 35 determines that the operation area D4 of the operation panel 18 has been pressed, and inverts the second flip-flop circuit to set it. The signal generation circuit 35 is connected to a motor drive circuit 36 to drive the sewing machine motor.
The operation command signal SG6 is output.

When the motor is driven, sewing is started based on operation command signals SG4 and SG5 for cloth feeding and needle swing output from the signal generating circuit 35.
Then, in order to finish sewing, the operation area D4 is again
When is pressed, the signal generating circuit 35 inverts the second flip-flop circuit to the reset state in the same manner as described above. As a result, the signal generating circuit 35 outputs an operation command signal SG6 to stop the sewing machine motor.
is output to the motor drive circuit 36. The motor drive circuit 36 uses this operation command signal SG6 and the operation command signal SG3 to stop the sewing machine motor so that the sewing needle 4a stops above the needle. Also, sewing needle 4a
When stopping the needle below the needle, if the operation area D1 of the operation panel 18 is pressed before or during sewing, the signal generation circuit 35 determines that the operation area D1 has been pressed, and the first flip-flop circuit is set, and based on the set state, an operation command signal SG3 for stopping the sewing needle 4a in the lower position is output to the motor drive circuit 36. As a result, the motor drive circuit 36 stops the sewing machine motor to stop the sewing needle 4a below the needle.

Furthermore, when performing tacking stitches or reverse stitching at the end of sewing, if the operating area 2 or the operating area D3 of the operation panel 18 is pressed, the signal generating circuit 35 starts the tacking stitches based on the electric signal output from the bridge circuit 31. Alternatively, a reverse stitching operation is determined, and operation command signals SG4 and SG5 are outputted for causing the feed and needle swing drive circuits 37 and 38 to immediately perform a backstitching or reverse stitching operation.

As described above, in this embodiment, by simply pressing the appropriate operation areas D1 to D4 of the operation plate 18, the operation area is determined by the ratio of the pressure applied to the bent portions 18a and 18b of the operation plate 18, that is, the first and It is determined by the signal generation circuit 35 based on the electric signal output from the bridge circuit 31 that corresponds to the ratio of the resistance values of the second resistance wire strain gauges 23 and 24, and is determined by the signal generation circuit 35 corresponding to the operation area. Sewing machine operation can be commanded. Moreover, it has a simpler configuration than a conventional switch serving as an operating section for executing the sewing machine operation, and can be mounted to the sewing machine frame 1 very easily.

Note that the present invention is not limited to the above-mentioned embodiments, and for example, in place of the first and second resistance wire strain gauges 23 and 24 as the detection elements, a piezoelectric semiconductor that generates an electric signal in accordance with pressure may be used. or providing a push button-like protrusion at the central position of each operation area D1 to D4 so that the pressing force is concentrated at the central position, etc., as appropriate without departing from the spirit of the invention. It is also possible to change.

Effects As detailed above, the present invention provides the same effect when a desired operation area is selectively pressed from among the operation areas defined in advance on the operation panel corresponding to a plurality of predetermined types of sewing machine operations. An electrical signal related to the pressure applied to at least two support points of the plate is generated, the operating area is determined based on the electrical signal, and the sewing machine operation corresponding to the operating area is commanded, so the sewing machine operation can be selected. The configuration of the operating section for issuing manual commands can be made simple and contactless, thereby improving the durability and reliability of the sewing machine.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a pattern sewing machine embodying the present invention, Fig. 2 is a front view of the operating frame, Fig. 3 is a side view of main parts showing how the operating panel is installed, and Fig. 4 is an electric circuit diagram. , FIG. 5 is a relationship diagram showing the relationship between the differential voltage and the operating area. Sewing machine frame...1, support frame...16, 17, operation plate...18, bending part...18a, 18b, first and second resistance wire strain gauges as detection elements...23, 2
4. Bridge circuit as a detection circuit...31, signal generation circuit...35, motor drive circuit...36, feed drive circuit...37, needle swing drive circuit...38, operation area...D1 to D4.

Claims (1)

[Scope of Claims] 1. A sewing machine capable of selectively performing a plurality of predetermined types of sewing machine operations, comprising operation areas D1 to D4 defined in correspondence with the number of predetermined sewing machine operations. The operation plate 18 is supported by at least two support points 16 and 17 on the sewing machine frame 1, and the pressure generated at each of the support points 16 and 17 by an external operation force applied to the operation plate 18 is as follows. a detection circuit 31, 32 comprising at least two detection elements arranged in close proximity to said support points 16, 17 for generating a ratio-related electrical signal Eout;
a signal generating circuit 35 that generates the electric signal to command one operation among the plurality of types of sewing machine operations; and a signal generating circuit 35 that drives a drive section provided for the sewing machine operation in accordance with the operation command signal. Controlling drive circuit 3
6, 37, and 38. 2. Claims characterized in that the detection element is comprised of resistance wire strain gauges 23 and 24 for measuring the strain of the operation plate 18 caused by the pressure generated at the support points 16 and 17. 1st
Automatically controlled sewing machine as described in section. 3. The automatic control sewing machine according to claim 1, wherein the detection element is composed of a piezoelectric semiconductor that responds to the pressure generated at the support points 16 and 17.