WO2017190862A1

WO2017190862A1 - Method for actuating a thread-cutting and thread-clamping device for cutting the shuttle thread on a large embroidery machine, and device for actuating the thread-cutting assembly in order to perform the method

Info

Publication number: WO2017190862A1
Application number: PCT/EP2017/054000
Authority: WO
Inventors: Franz Lässer; Hanno Nussbaumer
Original assignee: Lässer Ag
Priority date: 2016-05-03
Filing date: 2017-02-22
Publication date: 2017-11-09
Also published as: EP3452653A1; TW201739981A; KR20190002457A; CN107923096B; EP3452653B1; TWI696736B; CN107923096A; CH712431A1

Abstract

The invention relates to a method for an actuating device (21, 23) for a thread-cutting and thread-clamping device (33) at an embroidery station of a large embroidery machine, wherein the device for shutting down a shuttle is used to cut and clamp the shuttle thread (68). The invention further relates to a device for actuating a thread-cutting and thread-clamping device (33), wherein a plurality of thread-cutting and thread-clamping elements (75) can be simultaneously actuated by means of one device (46).

Description

LÄSSER AG, Hohenemserstrasse 17, CH-9444 Diepoldsau Method for actuating a thread trimming and cutting machine

Thread clamping device for cutting the shuttle thread on a large embroidery machine and a device for actuating the thread cutting arrangement for carrying out the method

The invention relates to a method for actuating a thread cutting and thread clamping device according to

Preamble of claim 1 and a

Actuating member for a device for carrying out the method according to claim 4.

When changing the color, pattern or repeat, the threads must be stitched together on an embroidery machine

be cut off. In the early days of embroidery on mechanical embroidery machines, these works were done manually. For many years

Thread cutting devices for large embroidery machines known, which are assigned to each individual embroidery point and which, controlled by the program, single or one

Can sever majority of selected shuttle threads between the boat and the embroidery. Such a thread cutting device is known, for example, from EP 0 638 682 B1. In the design of such automatic thread cutting devices, the designer is always ahead of the

Problem to realize a thread cutting device that must be installed in extremely tight space on large embroidery machines. Imagine that

Large embroidery machines with up to a thousand embroidery points, which means that a thousand needles and shuttle lines must be equipped with boats. In addition, the from the

Stickgrund running thread end lie as short as possible over the embroidery base and coming from the shuttle or the reel in the boat long cut end must remain arranged so that an embroidery on the temporarily disengaged embroidery points after a further color change is readily possible again.

With the above-described known device according to EP 0 638 682 B1, it is possible to cut at least the shuttle thread on the side of the shuttle tracks (the Stöckli). However, it has been found that the thread end, which comes from the embroidery material ago, has a relatively large length and that the second end, which leads from the boat, does not come to rest in a well-defined position. This can lead to problems when re-staking.

From EP 1 055 761 B1 is further a

Schiffchenstickmaschine with a driver bar unit known, with which the independent shutdown of each boat is made possible. By the Shutting down a boat prevents the cut thread end is destroyed by the rapid up and down movement of the boat, even downright grated on the disused boat and consequently a secure embroidering is no longer guaranteed. For the decommissioning of each individual boat is ever one

Pneumatic piston-cylinder unit provided with which an angle lever the lower driver nail in

Driver bar from the area of the shuttle

is extendable. The boat located in the respective shuttle track slides slightly downward after moving out of the driver nail and is held in this position. To Wiederansticken is with the

Pneumatic cylinder unit of the driver nail led back into the shuttle and when inserting the

Boat slightly raised again. thanks to this

Shutdown of the shuttle is the Schiffchenfaden leading off the shuttle of a not required

disused ship during the embroidery not destroyed.

An object of the present invention is to provide a method and a device which make it possible to move the shuttle thread between the shuttle

To cut the stitch hole plate and the embroidery bottom with the embroidery near the embroidery bottom. Another task is to cut the thread end between the boat and temporarily hold the embroidery floor until the

stopped embroidery point is put back into operation.

These tasks are solved by a procedure for

Actuation of a thread cutting and thread clamping device according to the features of patent claim 1 and a device according to the features of patent claim 4.

It succeeds in a cost effective and secure way, the

At each embroidery point, cut the shuttle thread separately near the embroidery base and in the area of the embroidery thread

Stitching hole plate securely clamp the thread end running to the shuttle until it is further embroidered at the respective embroidery point. By using the existing pneumatic piston-cylinder unit drive for shutting down the shuttle by retracting the driver nail, the thread cutting and

Thread clamping device safely and time precisely between the embroidery floor with the embroidery and the surface of the taphole plate out and there the two actions, namely the cutting and clamping, made. The severed shuttle thread has only a short piece of thread projecting from the embroidery floor, and the second end, which runs to the boat, is held securely and can therefore continue to do so

Embroidery process of the adjacent embroidery sites not to be damaged. The one in the clamping device

trapped thread is always ready to embroider. The structure of the device is also very inexpensive to produce, since for the connection of the thread cutting and thread clamping device, a switching drive for a

Variety, for example for 48 embroidery sites

summarized can be used. In other words, a single drive makes it possible, for example, at 48 or more points, the thread cutting and

To actuate Fadenklemmanordnung. Besides one

Cost savings, only one drive for 48 or more

Embroidery points, simplifies the control of the drive for cutting and clamping and also far less space is required and the area of the individual embroidery points on the Schiffchenseite is therefore less installed.

Reference to an embodiment of the invention will be explained in more detail. FIG. 1 shows a vertical section through the

Taphole plate of a large embroidery machine, the driver bar and the device for shutting down a single shuttle according to EP 1 055 761,

Figure 2 shows a cross section according to FIG. 1 with

retracted lower driver nail, a cross section according to FIG. 1, but with the driver bar in the raised position, a view of the range of

Taphole plate, the driver bar and the drives for the shutdown of a

Schiffchens and, according to the present invention, the arrangement for cutting the shuttle thread, namely the thread cutting and catching device out of engagement, a cross section through the area of the stitch hole plate, the driver bar and the drives for the shutdown of a

Schiffchens and, according to the present invention, the arrangement for cutting the shuttle thread, thread cutting and

Catching device out of engagement with the thread before the cutting process with the thread cutter engaged,

a cross section through the stitch hole plate of the shuttle guide (Stöckli) with the thread cutter in thread catching position, a side view of a

Thread cutter assembly in open

Position,

a supervision of the

Thread cutter assembly of the open position in Figure 7a, Figure 7c is a side view of

Thread cutter assembly in closed position,

Figure 7d is a plan view of the

Thread cutter assembly of Figure 7c in the closed position,

FIG. 7e shows a side view in an intermediate position of the thread cutter arrangement,

Figure 7f is a plan view of the

Thread cutter arrangement in one

Intermediate position of FIG. 7e,

Figure 7g is a perspective detail of the cutting and

Clamping parts in an intermediate position,

FIG. 8 shows a plan view of the needle hole plate,

workpiece side and

9 shows a schematic cross section through the

Stöckli and the Fadenschneid- and

Thread clamping device 33 in the rest position. In FIG. 1, on the left side, a driver bar 1 with an upper driver nail 3 and a lower driver nail 5 extending over the entire length of an embroidery machine with a multiplicity of embroidery sites is visible. The two driver nails 3 and 5 are spaced from a tap hole plate 7 with a tap hole 72 and project with the end portions 3 ^λ and 5 ^λ in one

Schiffchenbahn 9 a Stöckiis 48 into it. Of the Driver bar 1 is formed by not shown known drive means substantially in the vertical direction, for example 15 ° inclined from the vertical, according to arrow P oscillating movable.

For shutting down or stopping a shuttle 11 at the desired embroidery point of the embroidery machine, the lower driver nail 5 arranged there, in the figures, can be displaced in the horizontal direction, according to arrow Z, and pulled out of the shuttle 9 (position according to FIG. 2). The boat 11 is then no longer set in motion by the driver bar 1, since the lower

Driver nail 5 when booting the boat 11 no longer contacted. In Figure 1, the lower driver nail 5 is inserted and held the boat 11 between the two driver nails 3 and 5 with not visible in the figure 1 game.

In FIG. 2, the lower driver nail 5 is in FIG

Retraction position, so that the shuttle 11 slips down slightly and is held there in lowered position in the shuttle 9. The retraction of the lower driver nail 5, for example, by an angle lever 13 which at its elbow 15 to a

Swivel axis B is pivotally supported. The shorter arm 17 of the bell crank 13 is engaged with the end of the piston rod 19 of a piston 23 which is slidable in a cylinder 21. The piston 23 may be replaced by a fluid, e.g.

Compressed air, which through a valve 25 in the lower Cylinder space is introduced against the force of a spring 27 are moved upward (as in Figures 1 and 2

shown). In embroidery mode, the longer arm 29 of the angle lever 13 is slightly spaced on the right side of a radially projecting finger 31 attached to the lower driver nail 5.

By lowering the pressure in cylinder 21, the piston 23 is guided with the piston rod 19 by the spring 27 down and the angle lever 13 pivots in the

Counterclockwise and pulls the lower driver nail 5 from the area of the shuttle 9 out in the

Position, as shown in Figure 2. Of the

Angle lever 13 can after retraction of the

Driver nail 5 and lifting the driver bar 1 are pivoted back to the starting position. The boat 11 can not be moved in the shuttle 9 in the sequence despite oscillating movement of the driver bar 1 in the direction of the arrows P by missing engagement of the lower driver nail 5. The boat 11 is stopped.

In Figure 3, the driver bar 1 is shown in a raised position, in which position the angle lever 13 during a pivoting movement in the counterclockwise direction outside the engagement with the finger 31 at the bottom

Driver nail 5 is. From this position, after lowering the driver bar 1, the driver nail 5 can also be pushed back into the shuttle track 9. According to the invention, in the lowest position of

Schiffchens 11 a Fadenklemm- and cutting device 33 is actuated (see Fig. 4-6, 9). Their drive is carried out according to Figure 4 and Figure 5 with a long arm 29 of the angle lever 13 einklinkbaren connecting rod 35. The connecting rod 35 is mounted on one shaft 37 on a rocker 39 for the thread clamping and cutting device 33 on one side pivotally. The other free end 36 of the connecting rod 35 rests on the boom 42 of a lifting device 46. The lifting device 46 extends over a plurality, e.g. 48 embroidering points and makes it possible, or the connecting rod 35 at the embroidery from a form-fitting

Connecting element 49 with the long arm 29 of the

To release angle lever 13 (Fig. 4) or in this

engage (Fig. 5). The connecting element 49 comprises, for example, a semicircular, unilaterally open recess 50 in the connecting rod 35 on its underside and a cylindrical cam 52, which is laterally projecting from the long arm 29 (see also FIG. 5).

Preferably, by means of a leg spring 69, the connecting rod 35 on the cam 52 or the boom 42 of

Device 46 is kept pressed as long as the free end 36 of the connecting rod 35 is not lifted by the device 46.

If the cam 52 is inserted at the angle lever 13 in the recess 50 of the connecting rod 35, so can with the angle lever 13 and the connecting rod 35, the thread catching and cutting device -II -

S S formed at the lower end

Swivel axis A swung forwards or backwards.

If the long arm 29 on the angle lever 13, as described above, not connected to the connecting rod 35, so the long arm 29 is used for forward or backward sliding of the lower driver nail 5. The thread cutting and

Thread clamping device 33 is then out of engagement.

The thread trimming and thread clamping device 33 will be described in more detail with reference to FIGS. 6 and 7a-7g. On the rocker 39, which is connected to the pivot axis A with a carrier 73 of the embroidery machine, a knife lever 63 protrudes upward. The upper end of the knife lever 63 extends into the area between the two driver nails 3 and 5 (in

Section according to FIG. 6 not shown). The upper end of the knife lever 63 engages from below into a slot 51 on a first clamping element 45 and a second knife 43 (see Fig. 7) of a cutting and clamping arrangement 75 for the shuttle thread 68. The cutting and clamping arrangement 75 comprises a first knife 41 of a rectangular flat body made of metal, whose rear end 70 is T-shaped and whose front end a

Cutting edge 53 has. Adjacent to the first knife 41, a second knife 43 is arranged, whose front end is hook-shaped and on the rear side of the hook-shaped part comprises a cutting edge 53 ^λ . The second knife 43 projects beyond the rear end 70 of the The second knife 43 is adjoined by a second clamping element 45, the front end of which is likewise hook-shaped and whose rear end, like the second knife 43, comprises a slot 51 on its underside. At the rear and in parallel with the second clamping element 45, a first clamping element 47 adjoins, which at its front side (on the right in FIGS. 7) is at right angles to the first clamping element 47

Has longitudinal edges extending end edge and which at its rear end 70 is substantially T-shaped

is trained.

The two blades 41, 43 and the two clamping elements 45, 47 rest against each other laterally and are held in a rectangular channel 59 in the floor 48 (see FIG. 6). The two T-shaped end portions of the second knife 43 and the second clamping member 45 are laterally on Stöckli 48 and are pressed by the clamp holder 67 to the Stöckli 48. The rear or rear ends 70 of the first knife 41 and the first

Clamping elements 47 project beyond the floor in FIG. 6 on the left side and are in engagement with the free end of the knife lever 63. The front hook-shaped ends of the second knife 43 and the second clamping element 45 do not project beyond the floor 48 and those in FIG

drawn tap hole plate 7. Hereinafter, the operation of the thread cutting and thread clamping device 33 with the above-described

Cutting and clamping arrangement 75 explained in more detail. After the decommissioning of the shuttle 11 of a certain

Embroidery point by retraction of the driver nail 5 from the shuttle 9, as shown in Figure 2, by lowering the boom 42 with the device 46 of the

Conrod 35 is rotated by the leg spring 69 in the counterclockwise direction and the recess 50 at the bottom of the

Pleuels 35 in the bolt 52 on the long lever 29th

engaged. The leg spring 69 secures the catch also during the subsequent cutting and

Clamping operation. With the piston and cylinder assembly 21,23, with which previously the shuttle 11 has been stopped at the embroidery point described here by retraction of the lower driver nail 5, the angle lever 13 is now pivoted clockwise and thereby via the connecting rod 35, the rocker 39 to the Swivel axis A also pivoted clockwise. With the pivoting of the rocker 39 also pivots attached thereto

Knife lever 63 and pushes the second knife 43 and the second clamping member 45 to the right (see Fig. 6). The hook-shaped ends of the second knife 43 and the second clamping element 45 now project beyond the stitch-hole plate 7 behind the embroidery bottom 79, which is thereby lifted slightly to the right from the needle-hole plate 7 or preferably previously by a spreader 77 (FIG. 6). from the embroidery bottom 79 is kept spaced from the tap hole plate 7. To catch the from the embroidery bottom 79 (on the right side of the fishing hook 54) to the shuttle 11 in the shuttle 9 leading shuttle thread 68, the gate on which the embroidery bottom is spanned 79 is shifted such that the shuttle thread 68 from the hook 54, formed from the hook-shaped ends of the second

Knife 43 and the second clamping element 45, is caught (see Fig. 8). Now, by panning the

Angular lever 13 pivoted counterclockwise the knife lever 63 and this pulls with its upper end the second knife 43 and the second clamping element 45 to the left and with this also the shuttle thread 68 toward the needle plate 7. The shuttle thread 68, which from the embroidery bottom 79 to the shuttle 11 leads will be first

between the second clamping element 45 and the first

Clamping element 47 clamped. The shuttle thread 68 is subsequently cut through at the cutting edge 53 ^λ on the second knife 43 and the cutting edge 53 of the first knife 41. The continue to the embroidery bottom 79 extending end of the shuttle thread 68 is now as a short

Waving tail free from embroidery bottom 79. Of the

Shuttle thread 68 is released from the clamping again as soon as this embroidery point is put back into operation and thus also the boat 11 again from

Driver bar 1 is driven. The thread cutting and thread clamping device 33 is now in a position as shown in Fig. 9. The leaf spring 65 on the knife lever 63 ensures that the thread cutting and thread clamping arrangement 75 no longer projects beyond the surface of the needle hole plate 7 (FIG. 9).

Claims

claims

1. A method for operating a thread cutting and

Thread clamp (33) on any

Embroidery point of a large embroidery machine for cutting the shuttle thread (68) and for holding and clamping the end of the cut shuttle thread (68), characterized by the following method steps

- Coupling the thread cutting and

Thread clamping device (33) to a

Actuating device (21, 23) with a lifting device (46),

Moving a thread cutting and thread clamping arrangement out of the back of the needle hole plate (7),

- Catching of the boat (11) leading away

Shuttle thread (68),

- Moving back the thread cutting and

Thread clamp assembly (75) in the direction of

Tap hole plate (7),

- Clamping the shuttle thread (68) and

- Cutting the shuttle thread (68) between a nip of Fadenschneid- and

Thread clamp assembly (75) and the stretched embroidery bottom (79).

2. The method according to claim 1, characterized in that the thread cutting and Fadenklemmanordnung (75) through the taphole plate (7) into a channel (59) with the actuating device (21,23) for catching and for cutting and clamping of the shuttle thread (68) is moved back.

Method according to one of claims 1 or 2, characterized in that the cutting and clamping arrangement (75) with interposition of a connecting rod (35) temporarily with the actuating device (21,23) for decommissioning the lower driver nail (5) with a device (46 ), which extends over a plurality of embroidery sites, is connected.

Device for actuating a thread cutting and thread clamping device (33) on a

Big embroidery machine, with a variety of

Embroidery points, comprising a lower (5) and an upper (3) driver nail for the oscillating drive of boats (11) in Schiffchenbahnen (9) of a Stöckiis

(48) on the back of a taphole plate (7), further comprising suitable actuators

(21,23) for decommissioning individual boats (11), characterized in that

the actuating device (21, 23) for stopping a shuttle (11) with a connecting rod (35) to the thread-cutting and thread-clamping device (33)

is formed coupled. Apparatus according to claim 4, characterized in that the actuating device (21,23) for

Shutting down a shuttle (11) comprises a linear drive with which an angle lever (13) is pivotable back and forth and with which the lower

Driver nail (5) in the shuttle track (9) into and out of this is. Apparatus according to claim 5, characterized in that the angle lever (13) is articulated with its first short arm (17) on the piston rod (19) of the linear drive and the long arm (29) of the angle lever (13) with lowered driver bar (1). in engagement with the lower driver nail (5) can be brought.

Apparatus according to claim 6, characterized in that the connecting rod (35) with the long arm (29) of the angle lever (13) is connectable and by pivoting the angle lever (13) with a rocker (39) the

Thread cutting and thread clamping device (33)

is operable.

Apparatus according to claim 7, characterized in that on the rocker (39) has a knife lever (63)

is formed, at the free end of a Thread cutting and Fadenklemmanordnung (75) is attached.

Device according to one of claims 7 or 8, characterized in that the connecting rod (35) by pivoting about a at the thread cutting and thread clamping device (33) formed pivot axis (37) with the

Angle lever (13) is connectable. 10. Apparatus according to claim 9, characterized in that the pivoting of the connecting rod (35) with a

Device (46) takes place at the free end of

Conrod (35) attacks and extending over a plurality of juxtaposed embroidery sites.

11. The device according to claim 7, characterized in that the connecting of the connecting rod (35) with the

Angle lever (13) by lowering the connecting rod (35) to a cam (52) on the angle lever (13).

12. Device according to one of claims 7 to 11, characterized in that the thread cutting and

Thread clamping device (33) at its lower end of the hinged to the embroidery machine rocker (39) that on the rocker (39) an upwardly projecting

Knife lever (63) is arranged and whose upper end in engagement with a cutting and clamping arrangement (75) is, which in a channel (59) in Stöckli (48) and in the taphole plate (7) is axially displaceable.

Apparatus according to claim 12, characterized in that the separating and clamping arrangement (75) relative to each other slidable knives (41,43) and

Clamping elements (45,47) comprises, wherein each have a knife and a respective clamping element has a hook-shaped end (64).