JPS63160696A - Empty ring stitching apparatus of overlock 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 (Field of Industrial Application) This invention relates to an empty chain sewing device for an overlock sewing machine.

(Prior art) Conventionally, an empty ring sewing device in an overlock sewing machine cuts an empty ring to an appropriate length, which is formed continuously from the end of the previously sewn fabric at the beginning of sewing a new sewing item. It has a structure that allows you to sew in things you have done (
This work is generally called back-tuck.) That is, after sewing is finished, the worker moves the finished work cloth to the worker's side, and the cutting blade attached to the sewing machine frame holds the continuous empty ring at the desired length from the seam forming point. At the same time, the cut end was held between a pair of spring plates provided on the feed side of the sewing machine.

(Problems to be Solved by the Invention) However, in the above-described configuration, after sewing is completed, the work cloth is moved to the work side by the hand of the worker, cut at the work cloth feeding side, and then clamped. The worker had to carry out the work up to this point after finishing sewing each time, and there was a limit to the improvement in work efficiency.

(Purpose) The present invention has been made to solve the problems of the prior art described above.After sewing is completed, an empty ring connected to the workpiece cloth is cut to a required length on the feed side of the sewing machine, and then cut. By automatically moving the empty ring to the operator side (fabric feeding side) and holding it at the empty ring sewing position until the next workpiece fabric is set at the sewing position, the previously sewn workpiece fabric can be removed. There is no need for the operator to move the
An object of the present invention is to provide an empty chain sewing device for an overlock sewing machine that can improve the efficiency of sewing work.

(Means for Solving the Problems) This invention is provided on the cloth feeding side than the overlock seam forming means, and includes an empty ring cutting means for cutting an empty ring, and an empty ring cutting means that is provided after the empty ring is cut by the empty ring cutting means. A capturing means is provided to be able to capture and hold an empty ring connected to a needle and a louver, and the catching means is placed at a capturing position where the end of the empty ring is captured on the cloth feeding side, and the captured empty ring end is fed into the fabric. a drive means for selectively moving and arranging between the empty ring sewing position located on the side;
The gist of the invention is to include a control means for driving and controlling the driving means based on a start signal inputted after sewing is completed.

(Function) After the sewing is completed, the empty ring cutting means cuts the empty ring formed by the overlock seam forming means. The capturing means captures and holds the empty ring connected to the needle and the louver on the cloth feeding side after being cut by the empty ring cutting means, and the control means drives and controls the driving means based on a start signal inputted after sewing is completed. do.

Through this drive control, the driving means moves the capturing means that captures and holds the empty ring from the capturing position where the empty ring end is captured to the empty ring sewing position to place the captured empty ring end on the cloth feeding side. Move and place.

(Example) Hereinafter, an example in which the present invention is embodied in a two-needle overlock sewing machine will be described with reference to FIGS. 1 to 9.

Cloth plate 2 of overlock sewing machine (hereinafter referred to as sewing machine) M
A pair of needles 3a and 3b are provided in the sewing machine head 1 to which a needle bar is driven to be able to move up and down.
a and 3b constitute a seam forming means in cooperation with a louver (not shown), and form a seam on the work cloth W. Throat plate 4
Throat plate claws 5.6 are arranged in parallel and extend in the cloth feeding direction (see FIG. 4). Further, in the throat plate 4, needle holes 7 and 8 are provided on the side of the throat plate claw 5 and between both needle plate claws 5 and 6 to accommodate the needles 3a and 3.
b, and is extended in the cloth feeding direction and opened in the same direction.

A rotary solenoid 9 is fixed to the front side of the machine frame near the throat plate 4, and a pull-out body 10 is connected to a drive shaft 9a of the rotary solenoid 9 via a connecting lever 11. The extractor 10 is disposed along the lower surface of the throat plate 4, and its intermediate portion is guided by a guide means (not shown), and its distal end is inserted into both needle holes 7 and 8 from below. A pair of extraction portions 12 and 13 are formed.

Normally, the 0-tally solenoid 9 is demagnetized and the handling body 10 is placed on the cloth feeding side, and when the rotary solenoid is energized, the handling body 10 moves to the cloth feeding side. . The extraction part 1
There is a guide slope 128.13a on the cloth feeding side of 2.13.
is formed to guide the empty ring K from the needle hole 7 to the needle hole 8 when the handling body 10 moves toward the cloth feeding side.

Further, the throat plate 4 is provided with an opening 14 through which a feed dog (not shown) comes and goes. The presser foot 15 cooperates with the feed dog to transport the work cloth W in the cloth feed direction. In addition, for convenience of explanation, FIGS. 7(b) to 7(d) show the presser foot 15.
is omitted from the drawing. A positioning groove 1 is formed along the lower surface of the presser foot 15 from the cloth feeding side to the cloth feeding side.
5a is recessed and arranged to correspond vertically above the needle hole 8.

The empty ring suction pipe 16 is disposed on the delivery side of the throat plate 4 so as to extend in the cloth delivery direction along the lower side surface of the sewing machine head 1, and is used to generate negative pressure from a blower or the like via the suction tube 16a. means (not shown). A suction port 17 for sucking the empty ring K is formed on the side surface facing the needle plate 4 side. A fixed blade 18 is formed on the delivery side edge of the suction port 17. Air ring suction pipe 1
A known movable blade 19 is rotatably supported near the suction port 17 on the inner surface of the blade 6, and when sewing is completed, it is driven by a drive source (not shown) and cooperates with the fixed blade 18 to remove the empty ring. K can be cut. Said movable blade 19. The fixed blade 18 and the like constitute a known ring cutting means.

A mounting plate 21 is fixed to the front surface of the sewing machine head 1, and an air cylinder 23 for vertical movement is fixed to a mounting piece 22 protruding forward from the front of the mounting plate 21. A drive plate 25 is fixed to a piston rod 24 protruding from the lower part of the vertically moving air cylinder 23, and the piston rod 24 is positioned upward during sewing. A guide 26 is protruded from the lower part of the mounting piece 22, and a guide 26 is provided to protrude from the lower part of the mounting piece 22.
The drive plate 25 is slidably inserted into one side of the drive plate 25 to guide vertical movement of the drive plate 25. An air via 28 serving as a capturing means is inserted through the other side of the drive plate 25.
A proximal end portion of an air pipe support cylinder 29 bulging at the center is rotatably supported by the drive plate 25 .

A set collar 30 is fixed to the reduced diameter portion of the base end of the air pipe support cylinder 29 to prevent the air pipe support cylinder 29 from separating upward from the drive plate 25. At the lower part of the air pipe 28, a suction nozzle 31 is formed to protrude toward the front side (in FIG. 1) in an abbreviated shape, and is positioned above the feeding side of the cloth board 2 during sewing, as shown by the solid line in FIG. (hereinafter referred to as the empty chain sewing position), the air pipe 28 is moved down and further clockwise 90'.
When rotated, it is arranged in a catching position corresponding to and adjacent to the suction port 17 of the air ring suction pipe 16)
Ru. Further, the empty ring sewing position is set so that when the cut end of the empty ring cut by the empty ring cutting means is held at that position by the suction nozzle 31, the cut end does not come out from the suction nozzle 31. It is set. A suction tube 32 is connected to the upper end of the air pipe 28, and the connecting duplex 32 is connected to a blower (not shown). A drive lever 33 is fixed to the upper part of the air pipe support cylinder 29.

A mounting plate 34 is fixed to the upper part of the sewing machine head 1.
A support piece 35 is provided to protrude upward from the side. An air cylinder 36 for rotational movement is fixed to the support piece 35. Piston rod 3 of the rotationally moving air cylinder 36
7 is reciprocated along the rear direction during operation, and is positioned toward the rear during sewing. The tip end of the piston rod 37 is rotatably connected to a connecting shaft 33a provided upright on the drive lever 33 via a link 38. Further, the length of the connecting shaft 33a is long enough to allow the air pipe 28 to move up and down.

Next, to explain the electrical configuration of this empty chain sewing device, a central processing control unit (hereinafter referred to as CPU) 40 is installed in a control box (not shown) of the sewing machine, and controls the operation by pressing down on the treadle of the sewing machine. Then, the detection switch 39 is turned on, and a start signal from the detection switch 39 is input. The CPU 40 outputs control signals based on a control program stored in a program memory (not shown).

ffl magnetic valve 4 for vertical movement air cylinder 23
1 performs a switching operation based on a control signal from the CPU 40, and switches the air supply to the vertically moving air cylinder 23 via the air tubes 23a and 23b. The electromagnetic valve 42 for the air cylinder 36 for rotational movement is cut and driven based on the control signal from the CPtJ40, and the air cylinder 36
The air supply to the rotary movement air cylinder 36 is switched via a and 36b. An electromagnetic valve 43 for the empty ring suction pipe 16 provided in the suction tube 16a controls air suction into the empty ring suction pipe 16 based on a control signal from the CPU 40. The electromagnetic valve 44 for the air pipe 28 controls intake of air into the air pipe 28 based on control signals from CP and U3O. The drive circuit 45 of the rotary solenoid 9 is C
When a drive signal from the PU 40 is input, the rotary solenoid 9 is excited.

The operation of the ring sewing device constructed as above will be explained according to the flowchart shown in FIG. 9.

Now, during sewing, the rotary solenoid 9 is in a demagnetized state as shown in FIG. , 8 (on the worker's side). At this time, the extractor 12
．． The needles 3a and 3b are moved up and down on the cloth feeding side than the needles 13 (collision with each other is prevented. Also, during 1% l, the CPU 40 drives and controls the 'RII11 valves 41 and 42 to move the air cylinder 23 for vertical movement). piston rod 2
4 is retracted to the upper position, and the piston rod 37 of the rotating air cylinder 36 is located at the retracted position. Also, C
The PU 40 drives and controls the electromagnetic valves 43 and 44 to cause the air suction pipe 16 to suck air, while stopping the air vibrator 28 from sucking air.

[When f is completed (step 1, hereinafter step is represented by S), a series of empty rMKs are formed at the end of the work cloth W, as shown in FIG. It is wrapped around 6. The empty ring connected to the end of the work cloth W is shown in FIG. 7(a).

As shown in (b), the air is sucked into the suction port 17 of the air ring suction pipe 16 as in the conventional case, and is cut by the cooperation of the movable blade 19 and the fixed blade 18 in the air ring suction pipe 16 (see Fig. 7). See C). Next, when the sewing machine is stopped and the pedal is depressed, the presser foot 15 is raised by a drive mechanism (not shown) to a raised position that is approximately the same height as the empty ring sewing position. 82), CPU
40 outputs a control signal to the electromagnetic valve 43 based on the start signal of the detection switch 39, closes the electromagnetic valve 43, and stops sucking air into the air ring suction pipe 16 (S3).

Further, the CPLJ 40 outputs a drive signal to the drive circuit 45 to excite the rotary solenoid 9. For this reason, as shown in FIG. 8(b), the extractor 10 is horizontally moved in the cloth feeding direction, and the extractor 12.13 at the tip thereof is inserted into the needle hole 7.
．． 8 to the opening on the cloth feeding side of both needle holes 7.8, and the empty ring K wound around the throat plate pawl 5.6 is pushed out to the cloth feeding side.

Next, the CPU 40 outputs a control signal to the electromagnetic valve 41. Then, the electromagnetic valve 41 switches the air supply direction of the vertically moving air cylinder 23 to the opposite direction and moves the piston rod 24 downward, so that the air bike 128, which had been in the retracted position, is also moved downwardly to the downward position at the same time. , located below the presser foot 15 in the raised position and close to the feeding side of the throat plate 4 (S4). Subsequently, the CPU 40 outputs a control signal to the electromagnetic valve 42. Then, solenoid valve 4
2 switches the air supply direction of the rotational air cylinder 36 to the opposite direction, and in order to drive the piston rod 37 toward the front, the air pipe 28, which has been in the retracted position, is moved through the link 38 and the drive lever 33. It is rotated 90 degrees clockwise, and the suction nozzle 31 of the air via 28 comes close to the suction port 17 of the empty ring suction pipe 16, and is located at the capture position as shown in FIG. 7(d) (S5). .

After positioning the Airby 128 in this capture position, the CPL
J40 outputs a control signal to the electromagnetic valve 44. Then, the electromagnetic valve 44, which had been in the open state, opens to drive the air via 28 for suction (S6).

As a result of this suction by the air pipe 28, the suction nozzle 31
adsorbed or inhaled.

In this case, the CPU 40 outputs control signals opposite to those described above to the electromagnetic valves 41 and 42. That is, first, when the CPU 40 outputs a control signal to the electromagnetic valve 42, the electromagnetic valve 4
2 switches the air supply direction of the rotationally moving air cylinder 36 to the opposite direction and drives the piston rod 37 in the opposite direction to the front side. is rotated 90 degrees counterclockwise, and as shown in FIG.
(S7).

Next, the CPU 40 outputs a control signal to the electromagnetic valve 41. Then, the tm valve 41 switches the air supply direction of the vertical movement air cylinder 23 to the opposite direction to the above and moves the piston rod 24 upward, so that the air via 28 simultaneously becomes empty as shown in FIG. 7(f). It is moved upward to the sewing-in position (ie, the same position as the retracted position) (S8). In this way, while the air pipe 28 moves from the capture position to the empty ring sewing position, it is moved to the empty ring while being captured by the suction nozzle 31. When the empty ring K captured by the suction nozzle 31 moves upward to the empty ring sewing position, it engages in the positioning groove 15a on the lower surface of the presser foot 15 located at the upper position.

Further, when the empty ring K is moved to the empty ring sewing position, the empty ring is guided by the guide slope 12a of the extraction part 12 and the needle hole 8 is inserted into the empty ring.
is positioned near the opening of the CPU40 in that state
outputs a drive release signal and releases the excitation of the rotary solenoid 9 via the drive circuit 45. Then, the pull-out body 10 is moved back toward the cloth feeding side by the return spring, so that the pull-out body 10 is positioned in the empty ring in front of the needle hole 8 and biased by the needle plate claw 6.

Thereafter, when the next new workpiece cloth W is inserted between the presser foot 15 and the throat plate 4 and the presser foot 15 is moved downward by a known means, it engages in the positioning groove 15a of the presser foot 15. The empty loop thus formed is along the upper surface of the work cloth W. After this, when you step forward on the treadle, the sewing machine starts sewing again and the empty ring is sewn onto the top surface of the work cloth (89). On the other hand, based on the sewing start signal detected by the operation of the footboard at that time, the CPU 40 outputs a control signal to open the electromagnetic valve 43 and start sucking air into the air ring suction pipe 16 (S10). Close the air pipe 2
The suction of air No. 8 is stopped (811).

As described above, in this embodiment, since the empty ring sewing position of the suction nozzle 31 of the air via 28 is set higher than the cloth plate 2 surface serving as the work cloth holding surface, the empty ring K is placed on the upper surface of the work cloth W. It can be sewn in.

Next, the second embodiment will be explained according to FIG. 10. In this embodiment, the empty ring sewing position of the suction nozzle 31 of the air via 28 is set lower than the two cloth plate surfaces serving as work cloth holding surfaces,
Correspondingly, as shown in FIG.
A positioner @46 (only the cloth plate 2 is shown) for positioning the empty ring K is recessed along the cloth feeding direction. Further, the empty ring sewing position (i.e., the standby position) is set to a position below the cloth plate 2, and in 84 in the flowchart of the first embodiment, the air cylinder 23 for vertical movement is driven to the position above the cloth plate 2. At the same time, this embodiment differs from the first embodiment in that the vertically moving air cylinder 23 is driven to the position below the cloth plate 2, that is, to the empty ring sewing position in S8.

Therefore, in this embodiment, since the empty ring holding position of the suction nozzle 31 of the air pipe 28 is set lower than the cloth plate 2 serving as the work cloth holding surface, the empty ring K cannot be sewn onto the lower surface of the work cloth W. I can do it.

Note that the present invention is not limited to the above-mentioned embodiments, and modifications may be made without departing from the spirit of the present invention, such as making the empty ring sewing position almost the same height as the work cloth holding surface in the second embodiment. It is also possible to change it arbitrarily.

(Effects of the Invention) As described in detail above, the present invention cuts the empty ring connected to the workpiece cloth to the required length on the delivery side of the sewing machine after finishing gi manufacturing, and then automatically transfers the cut empty ring to the operator's side. (Cloth feeding side)
Since the machine is moved to the empty chain sewing position until the next workpiece cloth is set at the sewing position, the workpiece cloth that has been sewn last time has to be moved by the worker to the worker side.
It has an excellent effect of improving the efficiency of v1 manufacturing work.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view of an embodiment embodying this invention;
Fig. 2 is a front view of the main parts of the empty chain sewing device, Fig. 3 is a plan view thereof, Fig. 4 is a perspective view showing the mechanism of the extractor, and Fig. 5
The figure is an electric block circuit diagram, Figure 6 is an explanatory diagram showing the action of the movable blade and fixed blade, and Figures 7 (a) to (f) are perspective views of essential parts to explain the action of the empty chain sewing device. , Figure 8(a)
, (b) is a plan view of the main part for explaining the action of the extraction body, FIG. 9 is a flow chart diagram, and FIG. 10 is a front view of the main part of the second embodiment. 2 is a cloth plate, 4 is a throat plate, 7.8 is a needle hole, 16 is a hollow ring suction pipe, 18 is a fixed blade that constitutes a hollow ring cutting means, 19 is a movable blade that also constitutes a hollow ring cutting means, 23 2 is an air cylinder for vertical driving as a driving means; 24 is a piston rod;
8 is an air vibrator as a capturing means, 31 is a suction nozzle,
36 is an air cylinder for rotational movement as a driving means; 37
is a piston rod, 39 is a detection switch, 40 is a central processing control unit (CPtJ) as a control means, /l 1~
44 is a solenoid valve, M is a sewing machine, K is a hollow ring, and W is a processed cloth. Patent applicant Brother Industries, Ltd. Agent Patent attorney On 1) Hironobu Figure 2 Figure 5 Figure 9 “'plane 8°” Figure 7 (a) Figure 7 (b) B side /) 5 Figure 7 (d)

Claims (1)

[Claims] 1. An empty ring cutting means provided on the cloth feeding side than the overlock seam forming means and for cutting the empty ring; and a ring cutting means that is connected to the needle and the louver after being cut by the empty ring cutting means. a capturing means provided to be able to capture and hold an empty ring; and a capturing means configured to place the catching means at a capturing position where the end of the empty ring is captured on the cloth feeding side and an empty ring where the captured empty ring end is placed on the cloth feeding side. An overlock sewing machine comprising: a drive means for selectively moving and arranging between a chain sewing position and a control means for controlling the drive means based on a start signal inputted after sewing is completed. empty ring sewing device. 2. The height of the empty ring sewing position is approximately the same with respect to the work cloth holding surface so that the end of the empty ring captured by the capturing means is placed on the lower surface of the work cloth to be sewn next. An empty chain sewing device for an overlock sewing machine according to claim 1, which is set to have a high or low setting. 3. The height of the empty ring sewing position is set high with respect to the work cloth holding surface so that the end of the empty ring captured by the capturing means is placed on the upper surface of the work cloth to be sewn next. An empty chain sewing device for an overlock sewing machine according to claim 1.