JPS6362236B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a pattern selection device for a sewing machine that is capable of selecting a desired stitch pattern from a plurality of predetermined stitch patterns.

Prior Art Conventionally, when selecting a desired stitch pattern from among a plurality of predetermined stitch patterns, a switch corresponding to the desired stitch pattern is selected from a large number of switches corresponding to each stitch pattern. This was done by operating a switch. However, most of the switches used as the operation parts of these pattern selection devices have contact points, so they are inferior in durability and reliability.On the other hand, in the case of non-contact switches, they have operation parts that use photoelectric conversion means, etc. The pattern selection device had a complicated structure and was expensive. In addition, since these operating sections are arranged in rows with the same number of stitch patterns protruding from the sewing machine frame, the operating sections occupy a large proportion of the sewing machine frame, making the mounting structure complicated. Along with this, there were also problems with the design.

Purpose This invention has been made to solve the above-mentioned problems, and its first purpose is to provide a pattern selection device having a non-contact and simple configuration operation section; It is an object of the present invention to provide a pattern selection device which can reduce the proportion of the operating section occupied on the sewing machine frame and which can provide an excellent design.

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 having 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. Through their cooperation, various seams are formed on the processed cloth. 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.

An automatic return type starting switch 6 is provided on the head 3c, and when it is pressed once, the bracket arm 3 is activated.
The sewing machine motor provided on the pillar part 3a is driven,
Pressing it again will stop it. Also,
Three holding type speed setting switches 7, 8, and 9 (for low speed, medium speed, and high speed operation from the left) for setting the rotational speed of the sewing machine motor are provided on the lower front side of the pillar portion 3a.

When the sewing machine motor is driven at a required rotational speed, the needle bar 4 moves up and down and is positioned at a required swinging position by the swinging mechanism provided in the head 3c, and also the feed amount and feed direction of the feed dog. is controlled by a cloth feeding mechanism provided inside the bed 2.

The operation frame 11 is fitted into the front surface of the intermediate portion 3b, and a pair of left and right support frames 12 and 13 are provided as support points at the rear of both sides, as shown in FIG. It is fixedly installed in the section 3b. The operation plate 14 has bent portions 14 at both ends thereof.
When the plates 14a and 14b press the plate 14 from the front, they are supported so as to come into contact with the tip support surfaces of the support frames 12 and 13. As shown in FIG. 2, the front surface of the operation panel 14 has seven operation areas D1 to D7 divided in the longitudinal direction of the operation frame 11, and each of the areas D1 to D7 has a predetermined area. A figure 15 representing a stitch pattern is displayed, and by selecting and pressing any one of the operation areas D1 to D7, the stitch pattern corresponding to the figure 15 displayed in the pressed area is displayed. You can now choose the eye pattern. At this time, when the desired operation areas D1 to D7 are pressed, the operation plate 1
The ratio of pressure applied to the bent portions 14a and 14b of No. 4,
In other words, the ratio of the amount of deflection of the bent portions 14a and 14b is determined by the distance from the pressed position P to the bent portion 14b in the pressed operation area, regardless of the pressing force.
Distance LA from LB and pressing position P to bending part 14a
is equal to the ratio of

A first resistance wire strain gauge 16 as a detection element is attached to the inner surface of the left bent portion 14a, and its resistance value increases relative to the amount of deflection of the bent portion 14a. Similarly, a second resistance wire strain gauge 17 as a detection element is connected to the right bent portion 14.
It is attached to the inner surface of the bent portion 14b, and its resistance value increases relative to the amount of deflection of the bent portion 14b. The ratio of the resistance value of the first resistance wire strain gauge 16 to the resistance value of the second resistance wire strain gauge 17 is the left bent portion 1 of the resistance wire strain gauge 16.
The ratio of the amount of deflection of 4a and the amount of deflection of right side bent portion 14b is made equal to each other.

The micro switch 18 is connected to the right support frame 13.
disposed in a housing recess 13a formed on the support surface of the
The movable piece 18a slightly protrudes from the support surface and comes into contact with the right bent portion 14b of the operation plate 14.
Then, the operation plate 1 is pressed to the extent that the left and right bent portions 14a, 14b are pressed against the support surfaces of the support frames 12, 13.
4, the micro switch 18 is turned on by pushing the movable piece 18a to a position below the support surface of the support frame 13.

In FIG. 1, seven light emitting diodes 19 provided above the operation frame 11 are arranged at positions corresponding to the shapes 15 displayed on the operation panel 14, respectively, and are operated by pressing the operation panel 14. Based on this, the light emitting diode 19 corresponding to the pressed operation area D1 to D7, that is, the shape 15, is turned on.

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 21 as a detection circuit is composed of resistors R1 and R2 and the first and second resistance wire strain gauges 16 and 17, and a resistor R
1 and the resistance value of the resistor R2 are set to be equal. This bridge circuit 21 has a resistor R
1 and the connection point a of the first resistance wire strain gauge 16,
A constant voltage E is applied between the resistor R2 and the connection point b of the second resistance wire strain gauge 17, and the resistor R1 is , R2 and the connection point d between both strain gauges 16 and 17 are supplied to the differential amplifier 22 as electrical signals. And this differential amplifier 22 has a difference voltage between the two voltages.
Output Eout.

Therefore, when the operation plate 14 is not pressed, the ratio of the resistance values of the strain gauges 16 and 17 is 1, so this differential voltage Eout becomes 0V, and when it is pressed, the operation is performed as shown in FIG. Strain gauge 16,1 that changes relative to the pressing position P of the plate 14
It is determined based on the ratio of the resistance values of 7. At this time, if the center position of the operation plate 14 (the center position of the operation area D4) is pressed, the bent portions 14a, 1
The amount of deflection of 4b is the same, and both strain gauges 16,
Based on the fact that the ratio of the resistance values of 17 is 1, the differential voltage Eout becomes 0V. The A/D converter 23 converts the differential voltage Eout from the differential amplifier 22 into a digital signal SG1 and outputs it to the signal generation circuit 24.

The micro switch 18 has a resistor R at one end.
A positive voltage Vcc is applied through the switch 3, and when the switch 18 is turned on, it outputs an on signal to the signal generating circuit 24.

The signal generating circuit 24 is connected to the micro switch 18.
It inputs the ON signal from the A/D converter 23 and the digital signal SG1 from the A/D converter 23, determines whether or not the operation plate 14 is pressed based on the presence or absence of the ON signal, and determines that the plate 14 is pressed. Only when this happens, the pressing position P of the operation panel 14 is calculated based on the digital value of the digital signal SG1. Then, when the signal generation circuit 24 determines the pressed position P, first,
The pressing position P is the seven operation areas D1 to D7.
It is determined to which operation area it belongs, and a predetermined pattern code signal SG2 is outputted corresponding to the determined operation area. In order to display a desired stitch pattern corresponding to the determined area, a display device 25 including a light emitting diode 19 receives a pattern code signal and lights up a light emitting diode 19 corresponding to the desired stitch pattern; Further, a stitch data generating device (not shown) selects and generates stitch data for forming the desired stitch pattern according to the pattern code signal SG2.

As described above, in this embodiment, when selecting a desired stitch pattern, the figure 15 corresponding to the stitch pattern is selected.
By simply pressing the position where is displayed, the pressing operation area in the operation areas D1 to D7 changes to the ratio of the pressure applied to the left and right bent portions 14a, 14b of the operation plate 14, that is, the first and It is determined by the signal generating circuit 24 based on the electrical signal output from the bridge circuit 21 that corresponds to the ratio of the resistance values of the second resistance wire strain gauges 16 and 17. Then, the pattern code signal SG2 corresponding to the operation area determined by the circuit 24 is outputted to the display device 25, and the light emitting diode 19 indicating the selected stitch pattern is turned on.

Therefore, by simply pressing the shape 15 corresponding to a desired stitch pattern from among the shapes 15 displayed on the operation panel 14, the light emitting diode 19 is instructed as to what the selected stitch pattern is. This allows the operator to immediately check the selected stitch pattern. In addition, compared to conventional selection switches, the operating section for selecting a stitch pattern is integrated with the display section that displays the various stitch patterns that can be selected, and has a simple structure, making it easy to use on sewing machines. Not only can it be easily attached to the frame 1, but the proportion of the operating section on the sewing machine frame 1 is small, resulting in an excellent design.

Note that the present invention is not limited to the above-mentioned embodiments, and for example, instead of the first and second resistance wire strain gauges 16 and 17 as the detection elements, it is possible to A piezoelectric semiconductor or a pressure-sensitive resistor that generates an electric signal may also be used.

Effects As described in detail above, the present invention provides that when a desired operation area is pressed from among the operation areas defined in accordance with the predetermined number of patterns on the operation plate, external operations applied to the operation plate are An electrical signal related to the ratio of each pressure generated at each support point by force is generated, and the operating area is determined based on the electrical signal, so it is easy to create a pattern corresponding to the operating area. A sewing machine that can be selected reliably and has a simple and non-contact operating section for selection, which is highly durable and reliable, and does not damage the appearance of the sewing machine. It is possible to provide a pattern selection device with an excellent design.

[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 bottom view of essential parts showing how the operating panel is attached, and Fig. 4 is an electric circuit diagram. , FIG. 5 is a relationship diagram showing the differential voltage output from the differential amplifier with respect to the pressed position. Sewing machine frame...1, bracket arm...3,
Operation frame...11, Support frame...12, 13, Operation plate...14, Bend portion...14a, 14b, Figure...
15, First and second resistance wire strain gauges as detection elements...16,17, Micro switch...1
8. Light emitting diode...19, Bridge circuit as a detection circuit...21, Differential amplifier...22, Signal generation circuit...24, Operation area...D1 to D7.

Claims (1)

[Scope of Claims] 1. A sewing machine equipped with a pattern selection device that selects a desired pattern from a plurality of predetermined patterns according to a pattern code signal SG2 generated based on manual operation, comprising: includes an operation plate 14 having operation areas D1 to D7 defined in correspondence with the predetermined number of patterns and supported by at least two support points 12 and 13 on the sewing machine frame 1; At least one electrical signal Eout is arranged in close proximity to the support points 12, 13 for generating an electrical signal Eout related to the ratio of the respective pressures generated at the respective support points 12, 13 by an external operating force applied to the operation plate 14. Detection circuits 21 and 22 including two detection elements
and a signal generation circuit 24 that generates the pattern code signal SG2 based on the electrical signal Eout. 2. The pattern selection device for a sewing machine according to claim 1, wherein figures 15 representing the predetermined patterns are arranged in a row on the operation panel 14. 3. The detection element is comprised of resistance wire strain gauges 16 and 17 for measuring the strain on the operation plate 14 caused by the pressure generated at the support points 12 and 13. A pattern selection device for a sewing machine according to item 1. 4. The pattern selection device for a sewing machine according to claim 1, wherein the detection element is composed of a piezoelectric semiconductor that responds to pressure generated at the support points 12 and 13.