JPS6040872B2 - A device that automatically determines when thread waste and fabric waste are generated in an overlock sewing machine and removes them alternately. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to suction-type collection of fabric scraps and thread shoulders that are alternately generated during sewing on an overlock sewing machine. Or, it is an object to provide a device that is free from soot such as fabric scraps adhering to it and causing trouble in operation.

Conventionally, in order to remove the seed yarn shoulders and fabric scraps, the suction pipes for the yarn scraps and fabric scraps are combined before they are introduced into a common integral calendar box for the yarn scraps and fabric scraps. This method employs a method in which a switching valve is installed at each location, and the waste is stored in a shoulder box, which is then sucked out by a vacuum pump.The air containing thread waste and fabric scraps is forced to pass through the switching valve. In this case, the thread or fabric scraps that are mixed in adhere to the valve blades or inner wall of the switching valve, and the blades do not come into close contact with the valve seat, causing air leakage and poor sealing, reducing the valve function and eventually causing shoulder damage. However, there were drawbacks such as deposits on the valve portion, rendering the valve inoperable.

However, in the present invention, yarn waste and fabric waste are detected and stored in different shoulder boxes, that is, a yarn calendar box and a fabric waste box, through separate suction pipes, and a Only the purified air that has passed through the sarumura is suctioned by a vacuum suction pump and passed through the switching valve section, so that there is no soot passing through the switching valve, so there is no dust during vacuum suction. It is extremely effective because it does not give the opportunity for the valve to adhere to the valve and cause problems, allowing continued high-efficiency operation.

Moreover, in the present invention, when switching the switching valve in the vacuum suction connected to the vacuum pump to both the thread shoulder and fabric scraps, the detection device is not used during the transfer process of the fabric that is the object to be sewn. Then, based on the command from the detection device, the solenoid device is used to switch the flap valve, so the switching between thread shoulder suction and fabric scrap suction can be automatically performed, which is extremely effective. It is.

Reference will now be made in detail to the accompanying drawings, which illustrate one example of carrying out the invention.

1 is a known overlock sewing machine, in which thread waste is removed by cutting off the remaining part of the empty thread that adheres to the front and back ends of the fabric during sewing, and a small amount of thread is removed from the edge of the fabric to keep the stitching constant. This is generated together with string-like fabric scraps that are produced when cutting and sewing.

2 is a sewing machine work table on which the overlock sewing machine is installed.

3 is a sewing machine drive motor attached under the sewing machine work table 2, which drives the sewing machine via a belt and a pulley, and 4 is a driving pedal thereof.

Reference numeral 6 denotes a thread shoulder suction port which opens near the empty ring yarn cutting position near the needle drop portion 5, and 7 designates a thread waste suction pipe whose base is inserted into the thread calendar suction port 6.

Reference numeral 8 denotes a fabric scrap suction port which is closed close to the fabric scrap cutting position near the needle drop portion 5, and 9 is a fabric scrap suction pipe whose base is inserted into the fabric scrap suction port 8.

The box 0 is a yarn shoulder box, and the box 11 is a fabric scrap box. The inside of a dust collection box 13 with an open top is divided by a partition 12, and is removably inserted into a dust collection box base 14. 15
As shown in FIGS. 2 and 4, there is a yarn calendar vacuum suction cavity 16 on the top surface of the thread waste box 10, a fabric scraps vacuum suction cavity 17 on the top surface of the fabric scraps box 11, and a vacuum suction cavity 16 for thread waste and fabric scraps. 17
This is the lid of the dust collection box 13 that forms a vacuum suction pipe 18 that is combined with the dust collection box 13, and a packing 19 is interposed between the dust collection box 13 and the dust collection box 13.

Reference numeral 20 denotes a thread shoulder suction port attached to the upper surface of the lid body 15 so as to pass through the thread calendar vacuum suction cavity 16 and close its tip into the thread waste box 10. The drums were inserted into the drum.

21' is a fabric scrap suction port which passes through the fabric scrap vacuum suction cavity IT provided in the same manner and closes its tip into the fabric scrap box 11, and its base is inserted into the tip of the fabric scrap suction pipe 9. be.

Reference numeral 22 denotes a thread waste mesh made of porous synthetic resin, which is a thread filter material attached to the lower surface of the thread shoulder vacuum suction cavity 16 on the upper surface of the thread waste box 10.

23 is a vacuum suction cavity 17 for fabric scraps on the top surface of the fabric scrap box 11.
A similar mesh made of fabric scraps was attached to the bottom.

Reference numeral 24 denotes a vacuum pump storage section integrally attached to the lower surface of the lid 15, and the motor-directly coupled vacuum pump 25 is attached to a motor mounting base 26 on the lower surface.

A vacuum suction tube 27 connects the suction port 28 of the vacuum pump 25 and the vacuum suction tube 18 in which the yarn waste and fabric scrap vacuum suction cavities 16 and 17 are combined.

Reference numeral 29 denotes an exhaust discharge pipe that connects the discharge port 30 of the vacuum pump 25 and the brood cavity 31 formed in the lid 15.

33, 33 are the vacuum pump storage section 24 and the dust collection box base 1
4 is used to open and close the dust box 13 by swinging the lid 15 and the storage section 24 as shown by the arrow 34 in FIG. This is for taking out and disposing of thread waste and fabric scraps.

Reference numeral 35 denotes a switching valve rotatably supported at the combined part of the fabric scrap vacuum suction cavities 16 and 17, which comes into contact with valve seats 36 and 36' provided on the inner wall of the vacuum suction pipe 18, and removes yarn scraps. The vacuum suction cavity 16 and the vacuum suction pipe i8 are passed through each other (the switching valve 35 is in the same direction as the valve seat 36), and vice versa, the fabric scraps vacuum suction cavity 17 and the vacuum suction pipe 18 are passed through each other (the switching valve 35 is in the same direction as the valve seat 36). The valve seat 36' comes into contact with the valve seat 36'.

Reference numeral 37 denotes a shaft 3 on which the cut valve 35 is supported as shown in FIG.
This is a solenoid installed at the tip of 8 via an arm 39.

Reference numeral 40 indicates a return mechanism interposed between the iron core 41 and the solenoid main body 42. When the switching solenoid 37 is not energized (OFF), the spring 40 applies pressure to the iron core 41, and the switching valve 35 closes. When the valve seat 36 and the thread waste vacuum suction cavity 16 and the vacuum suction pipe i8 are connected to each other (on the thread shoulder side), on the other hand, if the cutting solenoid 37 is energized (ON), the solenoid 37 returns. 40, the switching valve 35 comes into contact with the valve seat 36', and communicates with the fabric scraps vacuum suction cavity 17 and the vacuum suction pipe 18 (on the fabric scraps side).

Next, the operation circuit of the cutting solenoid 37 will be explained in detail.
Reference numeral 43 denotes the sewing target material 4 advancing near the needle drop portion 5.
This fabric detector is composed of a light emitting element 45 consisting of an infrared LED and a light receiving element 46 consisting of a phototransistor, which are arranged vertically opposite each other so as to sandwich the fabric.

47 is a comparator that compares the output voltage of the detector 43 (the voltage across the resistor 48 interposed between the light receiving element 46 and the ground) and the voltage of a preset volume 49 interposed between the power supply Ncc and the ground. .

Reference numeral 50 denotes a timer made up of a monostable multivibrator, which inputs the output of the comparator 47 to its downwedge operation input pin A, both of which are installed in the control box 32.

T in the output pulse of this timer 50 is CR for timing.
It can be adjusted by adjusting the volume 51 connected to the connecting pins T, , r2, and it delays the operation of the switching solenoid 37 only between the fabric detector 43 and the hollow thread cutting knife (not shown). This is to completely cut and suction the empty loop yarn without immediately switching to the fabric scrap side. 52 is the output signal from the output pin Q of the timer 50 and the comparator 4
This is a two-input NOR gate that inputs the output signal from 7.

53 is a transistor interposed between the switching solenoid 37 and the ground as shown in FIG.
This is a diagram of the output pins of No. 2 and the base.

The operation sequence related to the switching solenoid 37 is shown in FIG. The present invention is constructed as described above, and the operation of the switching solenoid 37 is initially controlled by the phototransistor 46 until the front end of the material 44 to be sewn passes through the material detector 43.
Since the light from the light emitting element 45 reaches the fabric detector 4,
The output of No. 3 is maintained at a high voltage and input to a comparator 47. Since the voltage of the comparator is set in advance to be stronger than the high voltage of the fabric detector 43 by the volume 49, the output of the comparator 47 becomes 1, the timer 50 does not operate (Q=0), and the 2-input NOR gate 52
Since the output 1 of the comparator 47 is input, the output of the two-input NOR gate 52 becomes 0, the switching solenoid 37 is not energized, and the switching valve 35 is moved to the thread shoulder side (valve seat 36) due to the elasticity of the return spring 40. ). Next, the fabric 4
At the same time as the front edge of 4 begins to pass through the fabric detector 43 (at this time, thin fabric chips 54 are generated at the fabric side edge),
Since the phototransistor 46 is blocked from the light from the light emitting element 45, the output of the fabric detector 43 becomes a low voltage, lower than the set voltage of the comparator 47, so the output of the comparator 47 becomes 0. Here, at the down edge where the output of the comparator 47 changes from 1 to 0, the timer 50 is turned ON (Q=1) for a certain period of time T, and even if the output of the comparator 47 becomes 0, the timer 50
is ON (that is, while the front end of the fabric 44 advances from the fabric detector 43 to the empty ring yarn cutting position), 2 inputs N are input.
By setting the output of the OR gate 52 to 0 and keeping the switching valve 35 on the thread shoulder side, the empty ring thread 56 generated at the front end of the material 44 to be sewn is removed.
The vacuum suction tube 18 connected to the suction port 28 of the vacuum pump 25 and the vacuum suction cavity 16 are completely cut to an appropriate length and the switching valve 35 comes into contact with the valve seat 36.
The air in the thread waste box 10 is suctioned through the thread waste concentration overfill 22, and the empty ring thread 56 is passed through the thread waste suction port 6 through the thread shoulder suction port 20 and the thread shoulder suction pipe 7. The cut thread waste 57 is sucked in and stored in the thread shoulder box 10. When the timer 50 turns OFF (Q=0), the fabric 44 is still passing through the fabric detector 43 (that is, section a in FIG. 7).
Similar to the above, the output of the comparator 47 is 0, and the 2 inputs are NO.
The output of the R gate 52 becomes 1, the switching solenoid 3 is energized, and the switching valve 35 is placed on the dough scrap side (supported by the valve seat 36').
Then, the vacuum suction pipe 18 connected to the suction port 28 of the vacuum pump 25 and the fabric scrap vacuum suction cavity 17 are passed through, and the air in the fabric scrap box 11 is sucked through the fabric scrap filter screen 23, and the fabric scraps are removed. The fabric scraps 54 generated during sewing on the overlock sewing machine 1 are sucked in from the fabric scrap suction port 8 through the fabric scrap suction port 21 and the fabric scrap suction pipe 9, and are stored in the fabric scrap box 1.
1. Furthermore, the fabric 44 is indicated by the arrow 55
When the sewing of the previous fabric 44 is completed and the trailing edge of the fabric passes through the fabric detector 43 (that is, section b in FIG. 7), the phototransistor 46 receives light from the light emitting element 45. Since it reaches the point again, switch solenoid 3 in the same way as above.
7 is not energized, the switching valve 35 is brought back into contact with the valve seat 36 due to the elasticity of the imitation 40, and is switched to the yarn shoulder side. It is cut to an appropriate length, returns to the first operation, and repeats this operation. As described above, based on the detection of the fabric 44 by the fabric detector 43, the switching solenoid 37 is activated, and the switching valve 35
This is an automatic switching operation.

Moreover, the switching valve 35 is connected to a vacuum suction cavity 16 for thread waste 57, fabric scraps 54, and the yarn waste and fabric scraps separated by the mesh screens 22 and 23.
, 17 is installed in the vacuum suction pipe 18 of the combined part of the filters, so that only the purified air passed through the filter screens 22 and 23 passes through the switching valve 35.
, 57, etc., and it is possible to make a good imitation without any problems such as adhesion. In addition, 58 is an exhaust window attached to the upper surface of the exhaust cavity 31 of the lid body ridge 5.

Further, as shown in FIG. 5, the yarn shoulder box 10 and the fabric scrap box 11 may be arranged separately.

[Brief explanation of the drawing]

The attached drawings show an example of the implementation of the present invention, in which "Figure 1 is an overall perspective view, Figure 2 is a cross-sectional view of the main parts of the dust collecting section and vacuum section, and Figure 3 is a plan view of the main parts. Figure 5 is a sectional view taken along the line A-A in Figure 2, Figure 5 is a mechanical diagram showing another embodiment mainly consisting of only the vacuum suction part, Figure 6 is a perspective view showing the fabric detection device.
FIG. 7 is a perspective view showing only the fabric being sewn, FIG. 8 is a block wiring diagram showing the operation circuit of the switching solenoid, and FIG. 9 is a time chart showing the operation sequence of each part in FIG. 1... Overlock sewing machine 2... Sewing machine work table, 3... Sewing machine drive motor, 4... Drive pedal, 5... Needle drop, 6... Thread waste suction port, 7... Thread shoulder Suction pipe, 8... Fabric scrap suction port, 9... Fabric scrap suction pipe, 10... Thread waste box, 11... Fabric scrap box, 12...
Partition, 13... Dust collection box, 14... Dust collection box base, 15.
... Lid body, Army 6... Thread waste vacuum suction cavity, 17... Fabric scraps vacuum suction cavity, 18... Vacuum suction tube, 19... Packing, 28... Thread waste suction port ~ 21...・Fabric scraps suction port, 22... Thread shoulder mesh, 23... Fabric scraps mesh,
24...Vacuum pump storage section 25...Motor-directly connected vacuum pump, 26...Motor, 27
...Vacuum suction pipe 28...Suction port, 29...Exhaust discharge pipe, 3
0...Discharge port, 31...Exhaust cavity, 32...Control box, 33. ．．・Hinge, 34...Arrow, 35...Switching valve, 36, 36'...Valve seat, 37...Switching solenoid,
38...axis, 39...arm, 40...imitation to return, 4
DESCRIPTION OF SYMBOLS 1... Iron core, 42... Solenoid body, 43... Fabric detector, 44... Sewing target fabric, 45... Light emitting element, 46... Light receiving element, 47... Comparator, 4
8...Resistance, 49...Volume, 50...Timer, 5
1...Volume, 52... 2-input NOR gate, 53
...transistor, 54...fabric scraps, 55...
・Arrow, 56... empty ring thread, 57... thread calendar, 58...
・Exhaust window. Figure 1 Figure 3 Figure 4 Figure 2 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] 1. A thread waste box and a fabric waste box are provided, the base end is opened at the thread waste generation position, a thread waste suction pipe is provided in the thread waste box, the tip thereof is opened, and the base end is opened at the fabric waste generation position, A fabric scrap suction pipe with an open tip is provided in the fabric scrap box, a vacuum suction cavity is provided through a filter material in contact with the thread scrap box and the fabric scrap box, and the proximal ends are connected to both vacuum suction cavities for switching. A vacuum suction pipe is provided which joins through a valve, and a fabric detector is installed during the movement of the fabric to be sewn, and a command from the detector is transmitted to the switching valve by a solenoid device to operate the switching valve. A device for automatically determining when thread waste and fabric waste are generated and alternately removing them from an overlock sewing machine.