JPS5849179A - Control apparatus of two-needle 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 a control device for a two-needle sewing machine, and in particular to a control device for two-needle sewing machines, in which a seam is formed by two needles spaced apart from each other on the left and right, and a control device for a two-needle sewing machine. This invention relates to a control device for a two-needle sewing machine equipped with a needle bar mechanism that enables single-needle sewing in which a stitch is formed by stopping one of the needles upward based on a preset count in the section. .

Conventional technology Conventionally, when performing internal tightening with this type of two-needle sewing machine,
The number of needles to be paused at the corner and the number of single-needle stitches in the front and rear parts of the corner are input into the control device in advance, and internal tightening is performed according to the stitch formation command from the control device. It had become.

Then, for example, the inner tightening as shown in Fig. 1 is made with a width of 635 cm.
To explain the case where the sewing is performed from the upper left to the lower side with a pitch of '8.18+w, when tightening the right angle part shown in the same figure, after sewing to point Px and Px with double needle sewing, the control device The left hand needle is brought to rest upwards, and the right hand needle is driven at low speed by a set number of stitches (in this case, 2 stitches), and then stopped below the needle on the corner C'l.

Then, the cloth' is rotated 90 degrees around the right needle with this needle down stop pattern Mj/C, and then it is driven at low speed for the set number of stitches (2 stitches) in the 1-stitch state, and then the 2-stitch needle is moved again. By starting needle stitching, a right-angled square line as shown in the figure is formed.

However, with a two-needle sewing machine equipped with such a control device, for example, an obtuse angle (11
0°), similarly to the above-mentioned square line of the right angle part, operate the two needles to point Pl and P2, then move the right needle to corner C2 with the left hand resting upward. Since the same number of stitches are driven at low speed before and after the square line is made, when the set number of stitches is set to 1, as shown in the figure, and when the set number of stitches is set to 2, as shown in Fig. 2, There was a drawback that a seam was formed on the inside of the corner portion, deviating greatly from the desired obtuse angle, and a beautiful square line was not formed.

Purpose: In order to eliminate the drawbacks of the conventional example as described above, the present invention provides a stitch number setting means for setting the number of stitches in a one-needle sewing section, and a stitch number setting means for setting the number of stitches in a one-needle sewing section, and a stitch number setting means for setting the number of stitches in a one-needle sewing section, and a stitch number setting means for setting the number of stitches in a one-needle sewing section. It is an object of the present invention to provide a control device for a two-needle sewing machine that can beautifully sew corners under different conditions by providing a manual switching means for switching to regular needle sewing.

EXAMPLE Below, an example embodying the present invention will be described with reference to FIGS. 3 to 7. Two needleless sewing machines 2 are placed on a table 1.
is placed on the sewing machine 2, and needles 5.6 supported by two needle bars 6.4 spaced apart from each other on the left and right sides are mounted on the sewing machine 2.
A needle bar mechanism (not shown) that enables two-needle operation to form straight stitches and one-needle operation to form square stitches by stopping one of the needles at the needle-up position at corners.
is installed. The detailed structure of this needle bar mechanism is disclosed in Utility Application No. 50-2387 (Utility Model Application No. 50-2387) filed by the present applicant.
No. 1-85862 (Sewing Machine Needle Bar Movement Control Device), and since various similar devices are known in addition to this application, a detailed explanation will be omitted.

A DC motor 7 is attached to the lower surface of the table 1, and is connected to a sewing machine main shaft (not shown) of the sewing machine 2 via a belt 9. A foot pedal 11 is supported on a support shaft 10 fixed to the table 1 so that it can be depressed forward (toe side) and backward (heel side), and is built into a switch box 16 fixed to the side of the DC motor 7. It is connected via the continuous culm 12 to a pedal switch 24 which will be described later.

A return type release switch 14.15 as a manual switching means is provided on the lower surface of the bracket arm 2a of the sewing machine 2, and the needle 5 or 6 is released from the dormant state by pressing the button.

Next, an electric circuit of a control device for driving and controlling this two-needle sewing machine 2 will be explained with reference to FIG.

Five stitch count setting switches 21 as stitch count setting means are provided on the surface of the switch box 130, and are used to set the number of stitches for single-needle sewing in the front and rear parts of each corner (in this embodiment, the number of stitches is The number of stitches in each section is the same), and the set number of stitches is output as a digital signal. Five square wire direction selection switches 22 are also provided on the surface of the switch box 130 in pairs with the number of stitches setting switch 21, and are used to set the direction of the square wire, whether the square wire is clockwise 9 or counterclockwise 9. The set angle line direction is output as a digital signal.

The number of square wire stitches and the direction of the square wire at five locations can be sequentially set using the count setting switch 21 and the square wire direction selection switch 22.

The needle position detector 23 is composed of a permanent magnet piece (not shown) that rotates in conjunction with the main shaft of the sewing machine, and a plurality of Hall elements arranged around the permanent magnet piece.
The needle up position, needle down position, and thread trimming position are detected and the detection signals are output.

The pedal switch 24 is provided in a switch box 16, and is adapted to output a front depression signal and a rear depression signal when the foot pedal 11 is depressed.

The square wire selection switch 25 is provided on the surface of the switch box 16, and is used to set a mode for sewing square wires by sewing wooden nails, and outputs a digital signal when operated. .

The control circuit 26 is provided in the switch box 13,
The number of stitches setting switch 21 and the square wire direction selection switch 22
and a memory for storing each output of the square wire selection switch 25, and sends a signal to the motor drive circuit 27 based on the outputs of these switches 21, 22, 25, the needle position detector 23, and the pedal switch 24. Outputs
an operation of driving the DC motor 7 at high or low speed;
The power transistors 28 and 31, which will be described later, are biased and turned on.

The power transistor 28 is arranged in the switch box 13F3, its base is connected to the control circuit 26, its emitter is electrically grounded, and a solenoid 29 and the release switch 14 are connected between its collector and the collector power supply Vcc. connected in series. Further, a diode 60 for absorbing surge current is connected to the solenoid 29 and the release switch 14. The power transistor 61 is also arranged in the switch box 16 yen,
Its base is connected to the control circuit 26, its emitter is electrically grounded, and its collector and collector power supply V
cc and the solenoid 32 and the release switch 15.
are connected in series.

Further, a diode 33 for absorbing surge current is connected to the solenoid 32 and the release switch 15.

This solenoid 29 constitutes a part of the needle bar mechanism that stops the needle bar 3 and the needle bar 32 above,
When the power transistors 2B and 51 are biased by the control circuit 26 and turned on with the release switch 14.15 closed, the solenoid 29.52 is excited by the collector current of the power transistor 28.31. Based on this electromagnetic force, the needle bar mechanism pauses the needles 5 and 6 at the counting position.

Next, the operation of the control device for the double nail sewing machine constructed as described above will be explained according to the flowchart shown in the fifth part.

Now, to explain the case where a corner line with an obtuse angle of 110' as shown in FIG. The number of each nail sewing stitch is set using the llTl stitch number setting switch 21. Now, let this number of stitches be 2. Next, operate the square wire direction selection switch 22 to set a square wire that bends to the left as shown in the figure, and then operate the inner tightening selection switch 25 to select the mode for making the square wire. A digital signal for setting is stored in the memory within the control circuit 26.

When the foot pedal 11 is pressed forward in this state, the control circuit 26 detects the forward pressing signal from the pedal switch 24 and outputs a signal to the motor drive circuit 27 for causing the DC motor 7 to operate at high speed. Then, after performing the two-needle line to the Ps and Pa positions shown in FIG. Then, the control circuit 26 reads the leftward square gutter signal from the inner tightening direction selection switch 22 from the memory, biases the power transistor 31 based on that signal, and turns it on.
state. Then, the solenoid 62 is excited by the collector current of the power transistor 31, and the needle 6 is stopped at the needle-up position.

Next, the control circuit 26 determines whether at least one of the release switches 14, 15 is open. Now, since both the release switches 14 and 15 are closed, the control circuit 26 uses the DC motor to control the right hand 5t while the left hand 6 is resting at the upper position of the needle.
- Drive at low speeds. Then, when the needle 5 is operated for the number of stitches set by the stitch number setting switch 21 (in this case 2), the control circuit 26 stops the needle 5 at the needle down position on the corner C8.

Here, when the cloth is rotated around the needle 5 by an angle corresponding to the refraction angle 11σ and the foot pedal 11 is depressed forward, the control circuit 26 determines that both the release switches 14 and 15 are in the closed state, and the right Resume the one-piece nail stitch using needle 5 at low speed. Then, when the release switch 15 is pressed to open the circuit when the needle 5 has made one stitch, the collector current of the transistor 61 is cut off and the excitation of the solenoid 62 is released. Then, the control circuit 26 operates the last stitch of the set number of square wire stitches with two needles at low speed, and then presses the foot pedal 11.
If you continue to press forward, the straight line following the square line will be made into a two-needle line at high speed, forming a beautiful square line as shown in Figure 6.

One square wire is formed by such a procedure, and when forming multiple square wires, the number of stitches and inner tightening direction of each square wire can be set using the valley needle setting switch 21 and the corner edge direction selection switch 22. By setting , desired square wires can be sequentially formed. After forming all the square lines based on the set data, when the foot pedal 11 is pressed back,
The control circuit 26 determines that all the square wires are completed, stops the needles 5 and 6 at the needle-up position, and performs thread cutting to complete the sewing operation. In addition, if the foot pedal is released from the 2-piece nail sewing state, the needles 5 and 6 will be stopped at the needle-down position, and in this state, a new square wire cheetah will be input and the sewing machine 2 will continue to operate. can do.

Furthermore, this two-peg sewing machine 2 has the same obtuse angle (11
0°) can also be sewn using the following procedure.

That is, in the above procedure, after running the i needle with one needle from corner C8, the release switch 15 is pressed to release the rest state of the needle 6, and the last stitch of the set number of stitches is operated with two needles. , Similarly, if the number of square wire needles is set to 2, the pH value can be adjusted with two needles.
, After operating to the P4 position, press the release switch 15 to open the circuit, run the first l needle of the square wire with 2 non-stitches, run the following 1 needle with 1 needle with needle 5, and stop at the corner Cm position. After rotating the cloth around the needle 5, a square wire as shown in FIG. 7 is formed by running the cloth for a predetermined number of stitches.

Therefore, in the case of right-angled square wires, this two-piece nail sewing machine 20 control device performs one-piece nail operation according to the number of stitches and square wire direction set by the number of stitches setting switch 21 and the corner edge direction selection switch 22, as in the conventional case. By doing so, it is possible to form a desired square line, and in the case of an obtuse square line, the release switch 14 or 15 is activated during the set 1-piece nail sewing operation.
By pressing to open the circuit and canceling the rest barking of needle 5 or 6 which is stopped at the needle up position, you can select two arbitrary number of stitches from the set number of stitches for one-knee operation. By operating the needle, it is possible to form a beautiful square line that approximates a desired obtuse angle.

Effects As described in detail above, the present invention includes a stitch number setting means for setting the number of stitches in the one-piece nail sewing section for forming a square wire, and a stitch number setting means for setting the number of stitches in the one-piece nail sewing section for forming a square wire, and a stitch number setting means for setting the number of stitches in the one-piece nail sewing section for forming a square wire, and a stitch number setting means for setting the number of stitches in the one-piece nail sewing section for forming a square wire, and a stitch number setting means for setting the number of stitches in the one-piece nail sewing section for forming a square wire. Since a manual switching means for switching to stitching is provided, even when forming an obtuse-angled inner fastener, it is possible to form a beautiful inner fastener that approximates a desired obtuse angle.

[Brief explanation of drawings]

Figures 1 and 2 are stitch pattern diagrams of a conventional two-needle sewing machine according to the present invention, and Figure 3 is a stitch pattern diagram of a conventional two-needle sewing machine according to the present invention.
A front view of the needle sewing machine, FIG. 4 is a block diagram showing the electric circuit of the control device, FIG. 5 is a flowchart showing the arithmetic processing operation of the control circuit, and FIGS. 6 and 7 embody this invention. It is a stitch pattern diagram made by a two-needle sewing machine. Hands 5, 6, release switches 14, 15, number of stitches setting switch 21, corner one-way selection switch 22, control circuit 26, solenoid 29.35° Patent applicant Brother Industries, Ltd. Agent Hironobu Onda, patent attorney Figure 2 Figure 3

Claims (1)

[Claims] 1. Two needles spaced apart on the left and right (5°6)
In a two-needle sewing machine that can perform two-needle sewing that forms a cross seam and one-needle sewing that forms a seam by resting one of the needles at an upper position at a corner, 6 stitch number setting means (21) for setting the number of stitches in the single needle sewing section, and switching from single needle sewing to double needle sewing in the middle of the set number of stitches according to A control device characterized in that it is provided with manual switching means (14, 15) for.