JPH0368718B2 - - Google Patents

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a sewing machine, particularly an automatic sewing machine in which the color of the upper thread is automatically changed using a dyeing device, an automatic thread bonding device, an automatic thread tying device, etc. arranged close to the sewing machine. This invention relates to a sewing machine with a thread color changing device.

(Objective) The object of the present invention is to provide an automatic needle thread coloring device that has a device that can appropriately and automatically dispose of waste thread generated when changing the needle thread color of a sewing machine equipped with an automatic needle thread color changing device. To provide a sewing machine with a replacement device.

(Prior Art) Conventionally, when sewing with a sewing machine, sewing thread of a predetermined color is prepared in advance, and when changing colors, the sewing thread is replaced each time.

If you use this method of work, when sewing machine threads of many colors, such as pattern sewing or embroidery sewing, each time you change the sewing machine thread, stop the sewing machine, raise the presser foot, and thread the upper thread. After cutting, remove the upper thread, attach a different color thread to the sewing machine,
The needle must be rethreaded through the needle hole via a thread guide, thread tension device, thread take-up, etc., and this work is extremely complicated and time-consuming, and it has the disadvantage that it is difficult to automate the work.

As a means to solve this problem, there are two methods: dyeing white sewing thread in a predetermined color using a dyeing device placed close to the sewing machine and supplying it as needle thread, and using pre-dyed sewing thread. A possible method is to use an automatic thread tying device or an automatic thread bonding device to connect the thread of the previous color and the thread of the next color to automatically change the color.

However, when changing the upper thread color automatically using the method described above, the color changing command to the color changing device is always issued at a timing when some thread of the previous color remains for safety reasons. Inevitably, it is necessary to dispose of this surplus yarn, that is, waste yarn.

Therefore, in order to improve the practicality of a sewing machine with an automatic color change device, it is necessary to develop a device that can automatically and smoothly dispose of waste yarn. This idea was created after repeated consideration.

(Structure) That is, the present invention uses an automatic needle thread color changing device such as a dyeing device, an automatic thread bonding device, an automatic thread tying device, etc., which is arranged close to the sewing machine, and the automatic needle thread color changing device, which is arranged below the hook of the sewing machine. a waste thread processing device for processing waste thread generated in conjunction with changing the needle thread color; The present invention is a sewing machine with an automatic upper thread color changing device characterized by comprising a feeding means for feeding out thread, and more details thereof are as described below based on the embodiments.

A sewing machine with an automatic upper thread color change device may include a sewing machine equipped with a dyeing device, an automatic upper thread adhesive device, an automatic thread tying device, etc. as described above, but here, a so-called dyed sewing machine equipped with a dyeing device will be explained as an example. do.

An overview of the dyeing sewing machine will be explained based on FIG. figure)
It consists of

The white sewing thread 6 pulled out from a bobbin winder (not shown) is guided by a thread guide 7 and given appropriate tension by a thread tension device 8, and then guided into the dyeing device 1.
A first position for guiding the thread to the upper part of the coloring material application surface of the coloring material applicator 1-a and a second position for guiding the thread to the coloring material application surface of the coloring material applicator 1-a are controlled by an electromagnetic solenoid or the like. Thread guide 1- moved up and down by a drive device
d and brought into contact with the coloring material application surface of a selected one of the plurality of coloring material applicators 1-a fitted on the rotating disk 1-b,
A coloring material solution containing a coloring material such as a dye is applied.

The coloring material applicator 1-a has a porous material such as felt exposed on the surface that absorbs the coloring material solution stored in the container, and when the thread comes into contact with the exposed surface, the coloring material solution is applied to the thread. It is applied and the color change is done using thread guide 1.
-d to the upper position and the thread 6 to the coloring material applicator 1-
While pulling apart above a, a plurality of coloring material applicators 1-
After selectively positioning the coloring material applicator 1-a of a predetermined color by rotating the rotary disk 1-b fitted with the coloring material applicator 1-b by a shaft 1-c rotated by a drive motor (not shown), This is done by lowering the thread guide 1-d and guiding the thread 6 so that it comes into contact with the coloring material application surface of the coloring material applicator 1-a.

The thread 6 coated with the coloring material is guided to the pre-drying device 2 and pre-dried by blowing hot air, etc.
The coloring material is guided to the coloring material fixing/drying device 3 via the thread guide 9, and brought into close contact with the surface of the space heater 3-a by the guide rod 3-b that moves up and down, and the coloring material is fixed on the thread 6 by heat setting. The staining is completed.

The dyed yarn 6 is guided to a yarn reeling-out device 4, and in the yarn reeling-out device 4, a light shielding plate 4
-c by the signal issued by moving up and down the guide groove 4-d depending on the presence or absence of thread tension.
The yarn 6, which is held between the yarn pay-out roller 4-a and the driven roller 4-b, rotates by the drive of a drive motor (not shown) that is turned ON and OFF, passes through the yarn guides 10 and 11 in constant amounts and is consumed. It is fed out toward the amount detection device 5.

One embodiment of the yarn consumption detection device is shown in FIGS. 2 and 3.
As shown in the figure, the yarn 6 is guided to the yarn consumption detection device 5 through the yarn guides 10 and 11, passes through the tension plate 12, is applied to the yarn consumption detection roller 13, and then passes through the tension plate 14 and the yarn guide. 15 and then sent to the sewing machine.

The thread 6 hung on the thread consumption detection roller 13 is
Appropriate tension is provided by the weak pressing force of the tension plates 12 and 14, so when the thread 6 is fed out toward the sewing machine due to thread consumption during operation of the sewing machine, the thread consumption detection roller 13 rotates, and the bearing 16 A light shielding plate 1 having a plurality of slits in a disc attached to a roller shaft 17 supported by
8 is a photoelectric sensor 1 in which a light emitter and a light receiver are paired.
9 and sends a signal, which is the basis for measuring yarn consumption, to a calculation device (not shown).

In the calculation device, the actual yarn consumption is calculated based on the signal sent from the yarn consumption detection device.
A correction coefficient is calculated from the ratio of the actual thread consumption amount to the calculated thread consumption amount calculated from the sewing pattern data stored in the storage device, and the generation of the color change signal to the dyeing device is simply calculated based on the calculated data. This is done based on actually measured data rather than based on the color change signal, so that the color change signal can be generated at a more appropriate time. This will be explained based on FIG. 4.

First, measure the longest distance from the colorant application surface of the colorant applicator 1-a of the dyeing device 1 to the needle tip, and calculate the value S.
get.

For example, to explain the case of sewing alphabet letters while changing the color one after another, first, the sewing pattern data and color data are stored in the storage device, and the first needle drop point of sewing pattern A, a ₁ point, is stored in the storage device. The yarn length l = ₁ + ₂ + _{2 3} + ... _k-1ak on the coordinates for k stitches from a ₂ ..., a _k is calculated and stored.

Next, the ratio α=l'/l between the actual yarn consumption l' measured based on the signal from the yarn consumption detection device described above and the calculated yarn consumption l is calculated and used as a correction coefficient.

Select the needle drop point where you wish to change the color of the thread on the sewing pattern.
Let a _u be the standard, and calculate the thread length L from the a _u point each time you return one stitch from this point = _{u u-1} ,... _{u u-1} + _u-1
Product αL of a _u-2 ,... and correction coefficient α obtained earlier =
Compare L′ with S sequentially, L= _{u u-1} +… _n+1
Find the needle drop point a _n such that a _n , L′=αL≧S.

If there is no error at all, it would be fine to set the color change point for the dyeing device at point a _n , but in reality there is an error, so this error must be corrected and the color before the change must be changed up to point a _u . As if sewing with thread a _n
A color change signal is generated at the needle drop point a _p , which is a few stitches ahead of the point.

For the next pattern B, the color change signal generation point b _p for the dyeing device is determined in the same manner as for pattern A.

The method of generating a color change signal to the dyeing device at an appropriate time as described above uses an automatic thread bonding device or an automatic thread tying device as an automatic upper thread color change device.
Even when changing colors by automatically joining pre-dyed needle threads of different colors, it can be effectively applied to accurately determine when to activate the automatic thread bonding device or automatic thread tying device. It goes without saying that it can be done.

Even when a color change signal is generated based on the actual measurement of thread consumption as described above, some thread of the previous color always remains at the color change point on the sewing pattern.
Furthermore, if the color change signal generation point is determined by multiplying the calculated yarn consumption by a large safety factor, a large amount of yarn of the previous color will remain, so the next step is to dispose of this yarn that should be discarded. It becomes necessary.

In other words, sewing pattern A starts from point _A , and when the sewing progresses to point A _P , a color change signal is generated to the dyeing device, and the sewing continues until point A _U , and when the pattern sewing is finished, another 1 to 2 stitches are generated. The sewing machine is stopped with the upper shaft rotation angle approximately 300 degrees as shown in FIG. 5, and the next discarded thread is disposed of in this state.

Next, the waste thread processing device 24 disposed below the sewing machine hook section 23 will be explained based on FIGS. 5 to 8.

In addition, 20 is a needle, 21 is a cloth, and 22 is a throat plate.

When the sewing machine finishes sewing one sewing pattern and stops at an upper shaft rotation angle of approximately 300° to change the upper thread color, the electromagnetic solenoid 25 is activated and the clutches 26 and 27 are connected, and the upper thread is added to the upper thread in the sewing machine. The tension that has been applied will be automatically released.

After the pulse motor 28 performs the initial setting, it rotates to the left and rotates the spur gears 29 and 30 and the bevel gears 31 and 3.
2. Rotate the thread handling shaft 35 to the left through the worm 33 and worm gear 34.

A thread handling arm 36 is fixed to the thread handling shaft 35, and a thread handling arm 37 is screwed onto the tip of the arm, and the thread handling shaft 35 is rotated counterclockwise by ζ° from the starting position _Z0 . Stops at Z ₁ .

The thread handler 37 has a thread hook part 37-a and a thread receiving part 37-b, and the entire part is finished very smoothly. Behind the thread handler 37, the needle-side upper thread 6' and lower thread 38 are held in a thread receptacle 37-b.

Next, the pulse motor 28 rotates clockwise, and accordingly, the thread handler 37 rotates clockwise to hook the upper thread to the thread hook portion 37-a, while pulling the lower thread 38 to the thread receiver 37-a.
7-b, and while separating the upper thread with the needle side toward you and the fabric side toward the rear with the thread separating plates 39 and 40, rotate β degrees from the _Z1 point and stop at the _Z2 position.

During this time, the needle thread is held on the lace surface of the hook, and then the sewing machine rotates to the top dead center of the thread take-up and the needle thread is released from the lace surface of the hook.

Next, the pulse motor 28 rotates clockwise again, and the thread separator 37 rotates γ° to the Z ₃ position. is sandwiched between the yarn delivery drive roller 41 and the yarn delivery driven roller 42.

The yarn sending driven roller 42 is connected to the yarn handling shaft 35.
As the operating cam 43 attached to the rod changes from a peak to a valley, the operating claw 44 rotates clockwise, and the connecting rod 4
5. The needle-side upper thread 6' is transmitted through the thread-feeding roller arm 46 and pressed against the thread-feeding drive roller 41 fixed to the tip of the fixed-side drive roller shaft 47.
It is sandwiched between.

At this time, there is a slight gap between the claw of the operating claw 44 and the valley of the operating cam 43, and the roller pressure spring 52
acts as pressure on the roller.

On the other hand, the fabric side needle thread 6'' is not caught by the thread sending rollers but is dropped behind the rollers.

The yarn feed-out driven roller 42 has a shaft portion 42-a and a recessed portion 42-b, and a bearing bush portion 46-a provided on the yarn feed-out roller arm 46 is connected to the shaft portion 4.
2-a, and its tip end is fitted into the recess 42-b to prevent the fabric-side upper thread 6'' from getting wedged between the thread delivery driven roller 42 and the bearing bushing part 46-a.

The thread handling arm 36 moves from the _Z2 position to the thread delivery position _Z3
When the clutch rotates by .gamma. degrees, the drive by the pulse motor is stopped, the electromagnetic solenoid 25 is turned off, and the coupling between the clutches 26 and 27 is released.

Next, the pulse motor 28 starts to rotate clockwise again, rotates the thread sending drive roller 41 n _times to send out the waste thread, and the needle thread 6 whose color has been changed is pulled toward the needle 20. Preparations are made for sewing with the next colored thread.

The waste thread sent out by the rotation of the thread sending drive roller 41 is cut by an automatic thread cutting device (not shown) mounted on the lower side of the throat plate 22, and the pulse motor 28 is rotated clockwise _twice again to remove the thread. The rotation of the feed-out drive roller 41 completely discharges the waste yarn to the bottom of the sewing machine.

Incidentally, at the time when the cutting of the waste thread is completed, tension is applied to the needle thread again in the sewing machine to prepare for sewing.

Further, the rotational speeds n ₁ and n ₂ of the pulse motor 28 that rotates the yarn feed-out drive roller 41 are both integers, and the pulse motor 28 is set to 360°×n ₁ and 360°×n _{2 .} , n ₂ are appropriately determined based on experiments etc. so that the waste yarn can be appropriately disposed of.

Once the waste yarn has been processed, the electromagnetic solenoid 2
5 is turned ON again, the pulse motor 28 is rotated to the left, and the thread handling arm 36 is returned to the initial set position _Z0 .

The setting of the thread handling arm 36 to the initial setting position _Z0 is carried out by a position detection device using light, for example, which is composed of an initial setting sensor plate 48 and a cutting edge setting sensor 49, and the rotation is stopped. A position detection device composed of a sensor plate 50 and a rotation stop sensor 51 controls the thread handling 37 and the needle 2.
The sewing machine is prevented from rotating when there is a positional relationship where 0 interferes with the sewing machine.

When the thread handling arm 36 returns to the initial set position Z ₀ ,
The solenoid 25 is turned OFF again, the color change of the upper thread is completed, and all preparations for sewing the next pattern are automatically completed using the new upper thread of the changed color.

Next, the process to be performed when the needle thread breaks during sewing will be explained assuming that sewing patterns A and B in FIG. 4 are sewn with needle threads of different colors.

First, the following three cases can be considered where upper thread breakage occurs.

(i) From point a ₁ to point a _k of pattern A, that is, the time when yarn consumption l' is actually measured.

(ii) Between point a _k and point a _p .

(iii) Between point a _p and point a _u , i.e. after the color change signal is issued to the staining device.

The control mechanism of the sewing machine of the present invention is set so as to respond to the needle thread breakage at each point in time as follows.

In the case of (i), the counting of the thread consumption amount detecting device is interrupted by the signal from the upper thread breakage detecting device attached to the sewing machine, the thread is threaded through the needle, sewing is started again, and then counting is continued to total the count. Find the yarn consumption l′.

In case (ii), just rethread the thread.

In the case of (iii), if there is a small amount of wasted thread when threading again and it will not cause a shortage of sewing thread later, sewing will be resumed, but if there is a lot of wasted thread and it will cause a shortage of sewing thread In this case, the dyeing device is manually operated to return the dyeing to the original color, and in this case, the waste yarn generated due to the color change may be manually disposed of, but the waste yarn processing device It can also be done automatically using .

As described above, even if the needle thread breaks during the sewing operation, the sewing operation can be continued without any problem.

(Effects) As described above, the present invention provides a sewing machine equipped with an automatic upper thread color change device such as a dyeing device, and a waste thread processing device that extremely effectively processes waste thread generated during color change. This increases the practicality of a sewing machine with an automatic needle thread color change device, and brings about an extremely large effect on sewing operations that use multicolored needle threads, such as stitching with a sewing machine.

Furthermore, in the present invention, the waste thread is disposed of below the sewing machine hook, so not only does it not cause any hindrance to the sewing work, but the cut waste thread falls below the sewing machine and is disposed of, which is extremely convenient. Furthermore, this device does not simply pull the needle thread with a tension member, but instead sends it out with a roller, so even a large amount of thread, for example 1 meter, can be easily disposed of.

[Brief explanation of drawings]

Figure 1 is a diagram excluding the sewing machine part of the dyeing sewing machine, Figure 2 is a diagram excluding the sewing machine part.
Figures 3 and 3 are diagrams showing the yarn consumption amount detection device, and Figure 4 shows the yarn consumption amount detection device.
The figures show the color change signal generation process, Figures 5 to 8.
The figure shows a waste thread processing device. In the figure, 1 is a dyeing device, 24 is a waste yarn processing device,
37 is a yarn sorter, 41 is a yarn sending drive roller,
Reference numeral 42 is a yarn feed driven roller.

Claims (1)

[Claims] 1. An automatic upper thread color changing device such as a dyeing device, an automatic thread bonding device, an automatic thread bonding device, an automatic thread tying device, etc. located close to the sewing machine, and an automatic needle thread color changing device located below the hook of the sewing machine. A waste thread processing device comprising a needle thread tensioning means for the needle thread of the hook portion for disposing of waste thread generated due to color change, and a needle thread sending means for delivering the needle thread tensioned by the needle thread tensioning means. A sewing machine with an automatic upper thread color change device.