KR20190002457A - A method of operating a yarn cutting and clamping device to cut a shuttle yarn in a large embroidery machine and a device for operating a yarn cutting device to perform the method - Google Patents

Abstract

The present invention relates to a method for operating devices (21, 23) for yarn cutting and clamping device (33) at embroidery points of a large embroidery machine, wherein the device for securing the shuttle cuts shuttle yarn Used for clamping. The invention also relates to a device for operating a yarn cutting and clamping device (33) in which a plurality of yarn cutting and clamping means (75) can be operated simultaneously by a single device (46).

Description

A method of operating a yarn cutting and clamping device to cut a shuttle yarn in a large embroidery machine and a device for operating a yarn cutting device to perform the method

A subject of the invention is a method for operating a yarn cutting and clamping device according to the preamble of claim 1 and an actuator for an apparatus for carrying out the method according to claim 4.

Each yarn must be cut when changing dyes, patterns or pattern repetitions while embroidering on an embroidery machine. This work was done manually during the early days of embroidery on the mechanical embroidery machine. However, yarn cutting devices for large embroidery machines that have been assigned to each embroidery point and can be controlled by a program to cut individual or plural selected shuttle yarns between the shuttle and the material to be embroidered have been known for many years. Such a yarn cutting device is known, for example, from EP 0 638 682 B1.

When designing an automatic yarn cutting facility, designers are always faced with the problem of constructing a yarn cutting device that must be installed in a very narrow space of a large embroidery machine. It should be considered that a large embroidery machine should be equipped with up to 1,000 embroidery points, ie, 1000 needles with shuttle and shuttle lace. Also, the end of the yarn away from the embroidery backing fabric should be positioned as short as possible over the embroidery backing fabric, and the long cut end derived from the bobbin of the shuttle or shuttle should be embroidered at the embroidering point temporarily fixed, It must be kept in position to facilitate restarting.

The shuttle yarn on the side of the shuttle race (shuttle guide unit) can at least be cut by means of the device described above in accordance with EP 0 638 682 B1. However, the end of the yarn coming from the material to be embroidered was relatively long, and the second end guided from the shuttle was found not to be in a precisely defined position. This can be a problem when restarting embroidery.

Also, a shuttle embroidery machine having a drive bar unit capable of independently securing each individual shuttle is known from EP 1 055 761 B1. Fixing the shuttle prevents destruction of the cut end of the yarn in the shuttle fixed by the sudden up and down movement of the shuttle, which no longer guarantees that embroidery can be safely performed, and prevents it from being actually crushed. To secure each individual shuttle, a pneumatic piston cylinder unit is provided for each shuttle, whereby the lower driver pin of the drive bar can extend from the area of the shuttle race through the angle lever. The shuttle, located in each shuttle race, is held in this position by sliding slightly downward after the extension of the driver pin. To resume embroidery, the driver pin is guided back to the shuttle race together with the pneumatic cylinder unit, and the shuttle rises slightly again during guidance of the driver pin. Thanks to the shut-down of this shuttle, the yarn guided away from the undesired stationary shuttle is not destroyed in the embroidery.

It is an object of the present invention to create a method and apparatus for cutting a shuttle yarn between a needle plate and an embroidery base having an embroidery number close to the embroidery base. Another object is to temporarily secure the cut end of the yarn between the shuttle and the embroidery base until the stationary embroidery point is again activated.

This object is achieved by a method for operating a yarn cutting and clamping device according to the features of claim 1 and an apparatus according to the features of claim 4.

The present invention relates to a method of cutting an individual shuttle yarn at each embroidery point proximate to an embroidery base inexpensively and safely, and at the end of the yarn extending from the region of the needle plate in a fixed manner to the shuttle until the embroidery is resumed at each embroidery point Lt; RTI ID = 0.0 > clamping. ≪ / RTI > Retaining the shuttle by retracting the driver pin using the existing pneumatic piston cylinder unit drive securely and precisely guides the yarn cutting and clamping device in terms of time between the surface of the embroidery base with embroidery and the surface of the needle plate, Making it possible to carry out two operations, namely cutting and rigid clamping. The cut shuttle yarn has only a short piece of yarn protruding away from the embroidery base and the second end extending into the shuttle is securely held and can not be damaged during the further embroidery process of the adjacent embroidery spot. The yarn fastened to the clamping device is ready to be embroidered at any time.

The design of the device is made so that the switching drive can be produced very cheaply because it can be used for a plurality of, for example, 48 combined embroidery points to switch yarn cutting and clamping devices. In other words, a single driver makes it possible to operate the yarn cutting and clamping device, for example, at more than 48 points. In addition to representing cost savings, having only one drive for more than 48 embroidery points makes it easier to control the drive for cutting and clamping, and also requires much less space, resulting in individual The area of the embroidery point is less disturbed.

The present invention will be described in more detail with reference to embodiments.

1 is a vertical section through a needle plate of a large embroidery machine, a drive bar and an apparatus for securing an individual shuttle according to EP 1 055 761;
Figure 2 shows a cross section according to figure 1, in which the lower driver pin is retracted.
Figure 3 shows the cross section according to Figure 1, but the drive bar is in the raised position.
Fig. 4 shows an apparatus for cutting off the shuttle yarns of the yarn cutting and catching device, i.e., the area of the drive for securing the needle plate, the drive bar and the shuttle, as well as to be disengaged in accordance with the invention.
5 shows a cross-sectional view through the device for cutting the shuttle yarn according to the invention and the area of the drive for securing the needle plate, the drive bar and the shuttle, wherein the yarn cutting and catching device comprises a cut- The bond with the yarn is released before the operation.
Figure 6 shows a cross-sectional view through the needle plate of a shuttle guide device (shuttle guide unit) with the yarn cutter in the yarn catch position.
Figure 7a shows a side view of the yarn cutter device in the open position.
Figure 7b is a view of the yarn cutter device in the open position of Figure 7a.
7C is a side view of the yarn cutter device in the closed position.
Figure 7d is a view of the yarn cutter device of Figure 7c in the closed position.
7E shows a side view of the yarn cutter device in an intermediate position.
Figure 7f is a view of the yarn cutter device in the middle position of Figure 7e.
Figure 7g shows a perspective view of the cutting and clamping portion at the intermediate position.
Figure 8 shows a view of the needle plate on the workpiece side.
9 is a cross-sectional view schematically showing the shuttle guide unit and the yarn cutting and clamping device 33 in the rest position.

1 shows a driving bar 1 having an upper driver pin 3 and a lower driver pin 5 extending over the entire length of the embroidery machine with a plurality of embroidery points on the left side. The two driver pins 3 and 5 are spaced apart from the needle plate 7 having the stitch hole 72 and the end regions 3 'and 5' thereof are located in the shuttle race 9 . The driving bar 1 is formed so as to be movable in a substantially vertical direction by a known driving means (not shown), for example, in a manner of oscillating at an angle of 15 DEG from the vertical along the arrow P.

The lower driver pin 5 disposed thereon is shown horizontally in the figure and displaced in accordance with the arrow Z to form the shuttle race 9 in order to fix or stop the shuttle 11 at the desired embroidery point of the embroidery machine, (Position according to Fig. 2). Thereafter, the shuttle 11 is no longer moved by the drive bar 1, since the lower driver pin 5 is no longer in contact with the shuttle 11 when raised. In Fig. 1, the lower driver pin 5 is pushed in and the shuttle 11 is held between the two driver pins 3, 5 with a gap not visible in Fig.

2, the lower driver pin 5 is in the retracted position, so that the shuttle 11 slips down somewhat and is held there at a lowered position in the shuttle race 9. The lower driver pin 5 is retracted, for example, by an angle lever 13 which is pivotally supported about the pivot axis B at the elbow 15. The short arm 17 of the angle lever 13 is engaged with the end of the piston rod 19 of the piston 23 which can be displaced in the cylinder 21. The piston 23 is displaced upwardly by a fluid, for example compressed air (as shown in Figures 1 and 2) introduced against the force of the spring 27 into the lower cylinder space by the valve 25 . During the embroidery operation, the long arm 29 of the angular lever 13 on the right side of the radially projecting finger 31 fixed to the lower driver pin 5 is located somewhat farther.

By lowering the pressure of the cylinder 21 the piston 23 with the piston rod 19 is guided downward by the spring 27 and consequently the angle lever 13 is pivoted counterclockwise, (5) is pulled into the piston from the area of the shuttle race (9) as shown in Fig. The angle lever 13 can be pivoted back to the starting position along with the retraction of the driver pin 5 and the rise of the driving bar 1. [ As a result, the shuttle 11 can no longer move upwardly in the shuttle race 9, despite the fact that the drive bar 1 oscillates in the direction of the arrow P due to the lack of engagement of the lower drive pin 5 I can not. The shuttle 11 is stopped.

3 shows the drive bar 1 in an elevated position in which the position of the angle lever 13 is located outside the engagement with the finger 31 on the lower driver pin 5 during a pivotal movement in the counterclockwise direction. From this position, following the descent of the drive bar 1, the drive pin 5 can be pushed back into the shuttle race 9.

According to the present invention, a yarn clamping and cutting device 33 is operated at the lowest position of the shuttle 11 (see FIGS. 4 to 6 and 9). The yarn clamping and cutting device is driven in accordance with FIGS. 4 and 5 with a connecting rod 35 which can be latched on the long arm 29 of the angle lever 13. The connecting rod 35 is pivotally supported on one side of the shaft 37 in the jack 39 for the yarn clamping and cutting device 33. The other free end 36 of the connecting rod 35 rests on the side arm 42 of the lifting device 46. The lifting device 46 extends over a plurality of, for example, 48 embroidery points and is connected by a long arm 29 of the angle lever 13 (Fig. 4) It is possible to release the rod 35 or to engage it with the angle lever (Fig. 5). The connecting element 49 comprises, for example, on one side, a semicylindrical recess 50 opened on the lower side in the connecting rod 35 and a cylindrical cam 52 formed laterally protruding from the long arm 29, (See FIG. 5). The connecting rod 35 is moved by the leg spring 69 until the free end 36 of the connecting rod 35 is lifted by the device 46 so that the cam 52 or the side arm 42 of the device 46, As shown in Fig.

When the cam 52 of the angle lever 13 is pushed into the recess 50 of the connecting rod 35, the yarn catching and cutting device 33 is moved downward by the angle lever 13 and the connecting rod 35 And can be turned back and forth about the pivot axis A formed. When the long arm 29 of the angle lever 13 is not connected to the connecting rod 35 as described above, the long arm 29 serves to press the lower driver pin 5 back and forth. The yarn cutting and clamping device 33 is disengaged.

The yarn cutting and clamping device 33 will be described in more detail with reference to Figs. 6 and 7A-7G. The blade lever 63 projects upwardly on the jack 39 connected to the support 73 of the embroidery machine at the pivot axis A. [ The upper end of the blade lever 63 extends into an area between the two driver pins 3, 5 (not shown in the cross section according to FIG. 6). The upper end of the blade lever 63 is connected to the second blade 43 (see FIG. 7) of the cutting and clamping device 75 for the shuttle yarn 68 and the slot 51 on the first clamping element 45 . The cutting and clamping device 75 includes a first blade 41 made of a rectangular flat body made of metal, the rear end 70 of which is formed in a T-shape and the front end of which has a cutting edge 53. The second blade 43 is disposed in contact with the first blade 41, and the front end of the second blade is formed in a hook shape and includes a cutting edge 53 'on the rear side of the hooked portion. The second blade 43 projects beyond the rear end 70 of the first blade 41 and ends at the recess 51. The front end of the second clamping element is also formed in the shape of a hook and the rear end of the second clamping element 45 is connected to the lower side of the slot 51). It is the first clamping element 47 that engages and lies parallel to the second clamping element 45 at the rear, which has an end edge extending at a right angle to the longitudinal edge at the front side (right side in FIG. 7) And is formed in a T shape at the rear end portion 70 thereof.

The two blades 41 and 43 and the two clamping elements 45 and 47 contact each other laterally and are held in the rectangular channel 59 of the shuttle guide unit 48 (see FIG. 6). The two T-shaped end regions of the second blade 43 and the second clamping element 45 are laterally in contact with the shuttle guide unit 48 and connected to the shuttle guide unit 48 by the clamping holder 67 . The first blade 41 and the rear or rear end 70 of the first clamping element 47 project beyond the shuttle guide unit of Figure 6 on the left side and engage the free end of the blade lever 63. The forward hook ends of the second blade 43 and the second clamping element 45 project beyond the shuttle guide unit 48 and the needle plate 7 not shown in Fig.

The mode of operation of the yarn cutting and clamping device 33 with the above-described cutting and clamping device 75 will be described in more detail below. 2, after the driver pin 5 is retracted from the shuttle race 9 to fix the shuttle 11 at a specific embroidery point, the connecting rod 35 is moved by the leg spring 69 to the side arm And the recess 50 on the lower side of the connecting rod 35 is latched to the bolt 52 on the long lever 29. As a result, The leg spring 69 also holds the latching during subsequent cutting and clamping operations. The angle lever 13 is pivoted clockwise by the piston and cylinder devices 21 and 23 which were previously stopped at the embroidery point described herein by the shuttle 11 retracting the lower driver pin 5, The jack 39 is also pivoted clockwise about the pivot axis A by the connecting rod 35. The turning of the jack 39 also pivots the blade lever 63 fixed to it and presses the second blade 43 and the second clamping element 45 to the right (see Fig. 6). The hooked ends of the second blade 43 and the second clamping element 45 project beyond the needle plate 7 behind the embroidery base 79 and this results in a slight rightward rise by the needle plate 7 Or preferably from a needle plate 7 to the temple 77 (Fig. In order to capture the shuttle yarn 68 leading from the embroidery base 79 (right side of the catch hook 54) to the shuttle 11 of the shuttle race 9, the frame in which the embroidery base 79 is stretched, The hook 68 is displaced by the hook 54 formed by the hooked end of the second blade 43 and the second clamping element 45 (see Fig. 8). Thereafter, the blade lever pivots the blade lever 63 by pivoting the angle lever 13 counterclockwise, and the blade lever pulls the second blade 43 and the second clamping element 45 to the upper end to the left , And pulls the shuttle yarn 68 in the direction of the needle plate 7. The shuttle yarn 68 leading from the embroidery base 79 to the shuttle 11 is first tightly clamped between the second clamping element 45 and the first clamping element 47. The shuttle yarn 68 is further cut at the cutting edge 53 'of the second blade 43 and at the cutting edge 53 of the first blade 41. The end of the shuttle yarn 68, which continues to extend to the embroidery base 79, now freely protrudes slightly from the embroidery base 79 as a tail. The shuttle yarn 68 is not released again from the clamping until this embroidery point is again activated and therefore the shuttle 11 is also driven again by the drive bar 1. [

The yarn cutting and clamping device 33 is located at the position shown in Fig. The leaf spring 65 on the blade lever 63 ensures that the yarn cutting and clamping device 75 no longer protrudes beyond the surface of the needle plate 7 (FIG. 9).

Claims (13)

CLAIMS 1. A method of operating a yarn cutting and clamping device (33) at any embroidery point of a large embroidery machine, for cutting a shuttle yarn (68) and for clamping and clamping an end of a cutoff shuttle yarn (68)
- joining the yarn cutting and clamping device (33) to the actuating devices (21, 23) with the lifting device (46);
- moving the yarn cutting and clamping device from the rear side of the needle plate (7);
- capturing a shuttle yarn (68) guided away from the shuttle (11);
- moving the yarn cutting and clamping device (75) again in the direction of the needle plate (7);
- clamping the shuttle yarn (68), and
- cutting the shuttle yarn (68) between the clamping point of the yarn cutting and clamping device (75) and the stretched embroidery base (79)
≪ / RTI > The method according to claim 1,
The yarn cutting and clamping device 75 is again moved into the channel 59 through the needle plate 7 by the actuating devices 21 and 23 to catch and clamp the shuttle yarn 68 Lt; / RTI > 3. The method according to claim 1 or 2,
The connecting rod 35 is interposed so that the cutting and clamping device 75 is temporarily connected to the actuating devices 21 and 23 so that the lower driver pin 5 is connected to the device 46 which extends over a plurality of embroidery points. Is fixed. An apparatus for operating a yarn cutting and clamping device (33) on a large embroidery machine having a plurality of embroidery points, characterized in that the shuttle race (9) of the shuttle guide unit (48) on the rear side of the needle plate Further comprising a lower driver pin (5) and an upper driver pin (3) for driving the shuttle (11) with a suitable actuating device (21, 23) for securing the individual shuttle (11) In this case,
Characterized in that the actuating device (21, 23) is formed by a connecting rod (35) so as to be able to be coupled to the yarn cutting and clamping device (33) to stop the shuttle (11). 5. The method of claim 4,
In order to stop the shuttle 11, the actuating devices 21, 23 include a linear driver, the angle lever 13 can be pivoted back and forth by the linear driver, 9). ≪ / RTI > 6. The method of claim 5,
The angle lever 13 is articulated by the first short arm 17 on the piston rod 19 of the linear driver and is connected to the long arm 29 of the angle lever 13 when the drive bar 1 is lowered. Is connectable to the lower driver pin (5). The method according to claim 6,
The connecting rod 35 can be connected to the long arm 29 of the angle lever 13 and the yarn cutting and clamping device 33 can be driven by turning the angle lever 13 to the jack 39 Lt; / RTI > 8. The method of claim 7,
Characterized in that a blade lever (63) is formed on the jack (39) and a yarn cutting and clamping device (75) is fixed at the free end of the blade lever. 9. The method according to claim 7 or 8,
Characterized in that the connecting rod (35) can be coupled to the angle lever (13) by pivoting about a pivot axis (37) formed on the yarn cutting and clamping device (33). 10. The method of claim 9,
Characterized in that said connecting rod (35) is pivoted by means of a device (46) which acts on the free end of said connecting rod (35) and extends over a plurality of embroidery points arranged next to each other . 8. The method of claim 7,
Characterized in that the connecting rod (35) is connected to the angle lever (13) by lowering the connecting rod (35) at the cam (52) on the angle lever (13). 12. The method according to any one of claims 7 to 11,
The yarn cutting and clamping device 33 includes a jack 39 that is articulated on the embroidery machine at its lower end and a blade lever 63 projecting upwardly is disposed on the jack 39, Is coupled to a cutting and clamping device (75) displaceable axially in the channel (59) and the needle plate (7) in the shuttle guide unit (48). 13. The method of claim 12,
The cutting and clamping device 75 comprises a blade 41, 43 displaceable relative to and relative to the clamping elements 45, 47, one blade and one clamping element each having a hooked end 64, Lt; / RTI >

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