JPH0414868B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention involves applying ultrasonic waves to the folding line of the processed fabric to heat it during the process of stitching and transferring the processed fabric.
This invention relates to a sewing machine that bends the processed cloth.

(Prior Art) Conventionally, a sewing machine equipped with a feed device for transporting workpiece cloth to a sewing point is equipped with an ultrasonic generator, and when the upper and lower cloths are sewn together and transported, the seam allowances are moved in opposite directions. Consideration has been given to applying ultrasonic waves from an output horn of an ultrasonic generator to the folding lines of both fabrics during the sequential folding process, and heating the portions above the lines with ultrasonic energy.

At this stage of consideration, it is considered that the ultrasonic waves from the output horn of the ultrasonic generator are controlled to a constant output.

(Problems to be Solved by the Invention) According to the conventional sewing machine described above, the ultrasonic output does not change even when the feed speed of the work cloth changes, so when the movement speed of the work cloth slows down, the If the amount of heat supplied to the cloth increases per unit time, it may change the quality of the processed cloth, but if the moving speed of the processed cloth increases, the amount of heat supplied to the cloth per unit time increases. There is a problem that sufficient heat processing cannot be expected because the amount of heat is reduced.

Therefore, in the present invention, the above-mentioned problem is solved by adjusting the ultrasonic output from the ultrasonic generator according to the moving speed of the work cloth and maintaining the amount of heat received by the work cloth per unit time at a predetermined value. The technical problem is to solve this problem.

(Means for Solving the Problems) The technical means for solving the above problems is to connect a sewing machine equipped with a feeding device for transporting the work cloth to a sewing point with a sewing machine placed between the sewing machine and the work cloth to be transferred. An output horn and anvil of the sonic wave generator, a speed detecting means for detecting the transfer speed of the work cloth, and a speed detecting means detecting by the speed detecting means so that the amount of heat heated by the ultrasonic wave generator to the work cloth is always the same. and a control means for changing and controlling the ultrasonic output from the output horn of the ultrasonic generator according to the transfer speed of the work cloth.

(Function) According to the sewing machine configured as described above, when the feed device transports the work cloth toward the sewing point, the speed detection means detects the transport speed of the work cloth, and sends a signal corresponding to the transport speed to the control means. Output. The control means adjusts the ultrasonic output output from the output horn of the ultrasonic generator based on the speed detected by the speed detection means, and performs control to maintain the amount of heat received by the work cloth per unit time at a predetermined value. do.

(Example) An example of the present invention will be described below with reference to the drawings. The explanation is shown in Figure 1, which shows a perspective view of the main parts of the split sewing machine, and Figure 2, which shows the main parts in a side view with the tip of the sewing machine's bed partially cut away.
3, which shows a plan view of the vicinity of the throat plate of the bed, FIG. 4, which shows a cross section of FIG. 3, and FIG. 8, which shows a control block.

The split sewing machine includes a sewing machine main body 6, a guiding means 7 provided around the throat plate 10 and presser foot 11 of the sewing machine main body 6, and an arm 12 of the sewing machine main body 6.
The sewing needle 1 is rotated by an ultrasonic generator 8 provided at the tip of the needle and a drive motor (not shown).
Pulley 5 that transmits rotational force for raising and lowering 6
Consists of 0 etc.

The sewing machine main body 6 is a linear lockstitch sewing machine, and the upper cloth 1 and the lower cloth 2 are sewn together in a straight line. Note that a pulse encoder (not shown), which will be described later, is attached to the rotating shaft of the pulley 50, and outputs a pulse signal corresponding to the ascending and descending speed of the sewing needle 16.

Presser foot 11 attached to the lower end of presser bar 14
A dedicated device is employed to assist in guiding the seam allowances 1a, 2a of both fabrics 1, 2 by a guiding means 7, which will be described later. That is, the throat plate 10 has a needle hole 17 through which the sewing needle 16 moves up and down, and a feed dog 18 on a feed base 18A that performs a feed movement on the left side of the needle hole 17 by a feed mechanism (not shown) of the sewing machine body 6.
a groove portion 19 in which a pair of left and right tooth portions 18a appear and retract;
It has an opening 20 that is continuous from the groove 19 to the rear, and a notched recess 21 that is formed on the right side of the needle hole 17 and whose rear part is continuous with the opening 20.

Further, the presser foot 11 is attached to the lower end of the presser bar 14 with a presser clamping screw 22, and has a cloth presser portion 23 at its lower end. A presser tongue piece 25 is protruded rearward from the right rear end portion of the cloth presser portion 23.

Next, the guiding means 7 will be explained in detail. The guide means 7 guides the seam allowances 1a and 2a of both the cloths 1 and 2 immediately after being sewn by the sewing machine main body 6 in a folded manner in opposite directions one after another as the stitching moves. It is roughly divided into a lower cloth folding member 7B and an upper cloth folding member 7C.

The cloth dividing member 7A is formed into a substantially L-shaped plate shape,
A fabric is attached to the upper surface of the right rear portion of the throat plate 10 by a mounting screw 27, protrudes forward from the left end thereof, and is adjacent to the right side of the fabric presser foot 23 of the presser foot 11 and the presser tongue piece 25. It has a split part 28. The front end portion of the cloth splitting portion 28 is formed into a wedge shape whose thickness decreases toward the tip. The cloth dividing portion 28 of this cloth dividing member 7A is connected to the sewing machine main body 6.
The movement of the fabric fed out in conjunction with the stitching by the feeding mechanism (this movement is referred to as the stitching movement of the fabric).
Accordingly, the seam allowances 1a and 2a of the sewn fabrics 1 and 2 are relatively interposed between the seam allowances 1a and 2a, and the seam allowances 1a and 2a are moved in opposite directions, that is, the seam allowance 1a of the upper fabric 1 is moved upward. , and the seam allowance 1b of the lower fabric 2
is guided downward (see Figures 5 and 6).

Further, the lower cloth folding member 7B is integrally formed on the lower surface of the cloth dividing portion 28 of the cloth dividing member 7A. The lower cloth folding member 7B has a substantially rectangular plate shape, has a support portion 7B1 at its left end protruding to the left, and has a chamfered guide slope 31 at its left front end. Guide slope 3 of lower cloth folding member 7B
1 folds back and guides the seam allowance 2a of the lower cloth 2 guided by the cloth dividing member 7A (see FIG. 6). That is, the seam allowance 2a of the lower cloth 2 sewn to the upper cloth 1 is first bent downward by the action of the guide slope 31, and then guided to the upper surface of the support portion 7B1 while being folded back.

The upper cloth folding member 7C is made by bending a wire material, and its upper end bent into a substantially inverted U shape is attached to the upper left side surface of the presser foot 11 together with the presser clamp screw 22. It is attached by a mounting screw 32. The lower part of the upper cloth folding member 7C extends obliquely to the lower right and to the front while bypassing the rear of the cutout surface 26 of the presser foot 11, and the tip thereof is attached to the upper surface of the cloth splitting member 7A. The guide portion 33 is abutted by utilizing the elasticity of the guide portion 33. The guide portion 33 of the upper cloth folding member 7C folds back and guides the seam allowance portion 1a of the upper cloth 1 guided by the cloth splitting member 7A (see FIG. 5).

Next, the ultrasonic generator 8 will be described. The ultrasonic generator 8 is for forming a crease 3 along the folding line of the seam allowance portions 1a and 2a folded back by the folding members 7B and 7C.
The container body 34 is supported at the tip of the arm 12 of the sewing machine main body 6 via a support device 9, which will be described later. As is well known, the ultrasonic generator 8 includes a high-frequency oscillator 8C (described later) that generates high-frequency power for outputting ultrasonic waves.
, a resonant magnetostrictive vibrator 8B that converts the vibration into ultrasonic vibration, and an output horn 8A that transmits the ultrasonic vibration and increases its amplitude. In addition, the high frequency oscillator 8C and the vibrator 8B
etc. are built into the container body 34, and the output horn 8A is protruded from below the container body 34. Further, the internal configuration of the ultrasonic generator 8 will be described later with reference to FIG. 8.

Next, the support device 9 for the ultrasonic generator 8 will be described with reference to FIG.

A substantially U-shaped support 37 is attached to the back of the tip of the arm 12 of the sewing machine body 6 via a mounting bracket 36, and an air cylinder is installed vertically on the upper surface of the upper part of the support 37. A guide shaft 42 is provided vertically on the support 37 by screwing the threaded portion 41 of the knob 40 at the lower end into the lower piece of the support 37.
and a telescopic rod 39 that is movably provided on the guide shaft 42 and protrudes below the lifting cylinder 38.
a holder 45 rotatably supported on the side surface of the lifting table 43 via a shaft 44 and holding the container body 34 of the ultrasonic generator 8;
A fixing screw 47 that fastens the holder 45 to the lifting platform 43 through an arc-shaped opening hole 46 centered on the shaft 44 of the holder 45, and a screw 47 that is wound around the guide shaft 42 and of the threaded portion 41 of the knob portion 40. A spring 48 interposed between the end surface and the lower surface of the lifting platform 43
It consists of Therefore, the body 34 of the ultrasonic generator 8 is raised and lowered together with the lifting table 43 by the expansion and contraction of the lifting cylinder 38, and the mounting angle of the body 34 is determined by once loosening the fixing screw 47. Then, the holder 45 is rotated via the shaft 44, and the fixing screw 47 is tightened again to adjust the position as appropriate.

Therefore, the output horn 8A of the ultrasonic generator 8
The lower end portion (tip portion) is placed at a position adjacent to the rear of the feed dog 18, and presses down the folded portions 1a and 2a of the cloths 1 and 2 to be sewn and moved. Further, on the feed base 18A of the feed dog 18, an anvil 49 corresponding to the output horn 8A is installed adjacent to the rear of the feed dog 18. Note that the tip of the output horn 8A is formed in an inverted L shape, and is brought into contact along the folded portions 1a and 2a of the cloths 1 and 2 on the anvil 49.

Further, the pressing force against the anvil 49 by the horn 8A is determined as the urging force by the cylinder 38 minus the elastic force by the spring 48, and is adjusted to a desired value by adjusting the knob 40.

When the sewing machine main body 6 of the above-mentioned split-stitch sewing machine is operated (activated) and sewing is performed while overlapping the side seams of the upper fabric 1 and the lower fabric 2, first, the sewing needle 16 moves up and down, causing the sewing machine to become familiar. As shown, the upper cloth 1 and the lower cloth 2 are sewn together. At the same time, the lifting cylinder 38 lowers the ultrasonic generator 8, and
The vibrator starts vibrating.

Before and after the sewing of the two cloths 1 and 2, the seam allowances 1a and 2a of the upper cloth 1 and the lower cloth 2 are guided by the cloth dividing portion 28 of the cloth dividing member 7A in the vertical direction (opposite direction). (Fig. 4, 5)
(See Figure 6).

After that, presser foot 11 is on the sewing line of both fabrics 1 and 2.
As both fabrics 1 and 2 are sewn and moved while being pressed by the presser tongue piece 25 of
After being erected by the presser tongue piece 25, it is folded back. At the same time, the seam allowance 2a of the lower fabric 2
is once bent downward by the guide slope 31 of the lower cloth folding member 7B, and then the support part 7B1 and the cloth splitting member 7A are split by the action of the guide slope 31 of the cloth folding member 7B. It is folded back by 180 degrees and placed between the side surface of the section 28 and the side surface of the section 28. This folding is performed along the seam line located below the presser tongue piece 25 (see FIG. 6). The folded portions of the seam allowances 1a, 2a of both the cloths 1, 2 folded back in this manner are guided along the presser tongue piece 25 to the tip of the output horn 8A. The tip of the output horn 8A is
As shown in FIG. 2, since the seam allowances 1a and 2a are tilted upward to the right, the folded portions of the seam allowances 1a and 2a can easily enter between the tip of the output horn 8A and the anvil 49.

Immediately after that, the tip of the output horn 8A of the ultrasonic generator 8 comes into contact with the folded line of both cloths 1 and 2,
And, by the feeding movement of the feed table 18A, the feed table 18
When the anvil 49 is pressed against the tip of the output horn 8A with the cloths 1 and 2 interposed, the ultrasonic vibration generated by the ultrasonic generator 8 is generated along the fold line of the cloths 1 and 2. As a result, the cloth itself in contact with the output horn 8A generates heat, and the ironing effect of the heat causes the cloth 1,
2 is given a fold 3.

The heat generated in the cloths 1 and 2 by the ultrasonic vibrations of the ultrasonic generator 8 occurs only when the cloths 1 and 2 are held between the output horn 8A and the anvil 49. happen.

Next, the configuration of the control block shown in FIG. 8 will be explained.

The high frequency oscillator 8C is connected to the output horn 8.
A high-frequency oscillation circuit 51 that oscillates a rectangular pulse-like high-frequency signal corresponding to the frequency of the ultrasonic wave output from A, and converts the rectangular pulse-like high-frequency signal oscillated by this high-frequency oscillation circuit 51 into, for example, a sine wave signal. Then, after amplifying the voltage to a predetermined voltage level, an output control circuit 52 outputs this sine wave signal.
and an output amplification circuit 53 which inputs the sine wave signal of a predetermined voltage level outputted from the output control circuit 52 and amplifies the power of this sine wave signal; and an ultrasonic output circuit 54 which converts the power into sound wave output power and supplies it to the vibrator 8B.

The frequency (frequency) of the power amplified sine wave output from the output amplification circuit 53 is constantly monitored,
This is fed back to the high frequency signal oscillation circuit 51, and the feedback frequency is compared with a set value, and if a deviation occurs, control is performed to converge to the set value. Further, the amplification degree of the sine wave after power amplification outputted from the output amplifier circuit 53 is constantly monitored, and it is fed back to the output control circuit 52, and if a deviation occurs compared to a predetermined amplification degree, Convergence control is performed to a predetermined amplification degree.

A pulse encoder 55 detects the rotation speed of the pulley 50 and outputs a pulse signal corresponding to the rotation speed, and a feed adjustment mechanism (not shown in the configuration of the sewing machine body 6) is provided to detect the feed pitch amount. A potentiometer 56 is connected to a suture movement speed calculation control circuit 57. This suturing movement speed calculation control circuit 57 is controlled by a pulse encoder 55.
Pulse signal output from potentiometer 5
The suturing movement speed is calculated by inputting the voltage signal output from 6, and a control signal corresponding to the calculated suturing movement speed is output to the output amplification circuit 53. When the control signal output from the suture movement speed calculation control circuit 57 is input to the output amplification circuit 53, the output amplification circuit 53 adjusts the degree of amplification in accordance with the control signal, and even if the suture movement speed changes. The amount of heat applied to the seam allowances 1a, 2a of both fabrics is controlled to be maintained at a predetermined value.

Next, the operation of the suture movement speed calculation control circuit 57 will be explained according to the control flowchart of FIG. 9.

The power is turned on to the split sewing machine and Step S is started.
After initialization as shown in 1, sewing of the upper fabric 1 and lower fabric 2 is started, and the lifting cylinder 3
8 lowers the ultrasonic generator 8 and generates ultrasonic waves from the ultrasonic generator 8 to the folded portions 1a and 2a of the upper fabric 1 and the lower fabric 2.

In step S2, the pulse encoder 55
The pulse signal corresponding to the rotational speed of the pulley 50 outputted from the sewing machine, that is, the vertical movement speed of the sewing needle 16, is read, and in the next step S3, the pulse signal corresponding to the rotational speed of the pulley 50, which corresponds to the vertical movement speed of the sewing needle 16, is read, and in the next step S3, the feed pitch amount when feeding both cloths, which is outputted from the potentiometer 56, is read. Load the corresponding voltage signal. In step S4, the suturing movement speed is calculated based on the pulse signal and the voltage signal. In step S5, a control signal for ultrasonic output control based on the suturing movement speed calculated in the previous step is output to the output amplification circuit 53, and then the process returns to step S2 and repeats the processes of steps S2 to S5. The output amplification circuit 53 adjusts the degree of amplification based on the control signal for ultrasonic output control, and automatically controls the amount of heat applied to the seam allowances 1a and 2a of both fabrics to be constant.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and can be applied to general apparatuses that require a constant amount of heating at all times.

(Effects of the Invention) As described above, according to the present invention, the ultrasonic output output from the output horn of the ultrasonic generator is controlled in accordance with the transfer speed of the work cloth, and the amount of heat given to the work cloth is controlled. Since it is possible to maintain a predetermined value, even if the transfer speed of the processed cloth changes, the degree of heat processing on the processed fabric can be maintained uniformly, and the quality of the processed fabric after heat processing can be made uniform. be.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a perspective view of the main parts of a split-stitch sewing machine, FIG. 2 is a partially cutaway side view of the tip of the bed in the same sewing machine, and FIG. FIG. 4 is a plan view of the surrounding area of the throat plate, FIG. 4 is a cross-sectional view taken along the - line in FIG. 3, FIG. 7 is a partially cutaway side view showing the support portion of the ultrasonic generator, FIG. 8 is a control block diagram, and FIG. 9 is a control flowchart. 1... Upper fabric, 1a... Seam allowance, 2... Lower fabric, 2a...
seam allowance, 6...sewing machine body, 7...guiding guide means,
8...Ultrasonic generator, 8A...Output horn, 8B...
Vibrator, 8C...High frequency oscillator, 50...Pulley, 5
1... High frequency signal oscillation circuit, 52... Output control circuit,
53... Output amplification circuit, 54... Ultrasonic output circuit, 5
5... Pulse encoder, 56... Potentiometer, 57... Suture movement speed calculation control circuit.

Claims (1)

[Scope of Claims] 1. A sewing machine equipped with a feeding device for transporting a workpiece cloth to a sewing point, comprising: an output horn and an anvil of an ultrasonic generator disposed to sandwich the workpiece cloth to be transferred; a speed detection means for detecting a transfer speed; A sewing machine comprising: control means for changing and controlling the ultrasonic output from the output horn of the generator.