WO2018015100A1

WO2018015100A1 - Embroidery machine, in particular shuttle embroidery machine

Info

Publication number: WO2018015100A1
Application number: PCT/EP2017/065445
Authority: WO
Inventors: Franz Lässer
Original assignee: Lässer Ag
Priority date: 2016-07-21
Filing date: 2017-06-22
Publication date: 2018-01-25
Also published as: CH712727A1; EP3488040A1; EP3488040B1; CN109312512A; TW201804046A

Abstract

The invention relates to an embroidery machine, comprising a thread cutting and thread clamping device (1) for cutting and clamping the needle threads. An autonomous thread cutting and thread clamping element (55) is arranged on a carrier plate (45) for each embroidery position and can be driven. Each individual thread cutting and thread clamping element (55) can individually be switched on or off by means of a drive.

Description

LÄSSER AG, Hohenemserstrasse 17, CH-9444 Diepoldsau

Embroidery machine, in particular shuttle embroidery machine

The invention relates to an embroidery machine,

in particular shuttle embroidery machine according to the preamble of patent claim 1.

In EP 0 768 418 a front thread cutting and clamping device for cutting the front threads, also called needle threads, described in which at

Fabric presser plate on which the presser finger fingers or paws are formed, a knife rule is arranged displaceably in the vertical direction. At this

Knife ruler thread catcher are arranged with angled ends, which are designed to catch the needle threads that lead from the needle to the embroidery. Further, hook-shaped knives are formed on the knife ruler, which cut through the caught by the fishing thread at a cutting edge or cutting edge, which is formed on Stoffdrückerblech, when the latter is guided relative to the fabric presser plate down. With this known device all running between the embroidery material and the needles threads can cut simultaneously and the upcoming coming from the needles thread end after cutting are also clamped to a device, so that in the

200419WO - 22.06.2017 Resume stitching on the subject

Embroidery point, the thread need not be threaded again in the eye of the needle. With this device, the threads can be cut properly and temporarily clamped substantially securely. A disadvantage of this device, however, is that always all threads simultaneously

not only those who are in the current embroidery process. Another disadvantage of the known device is that when embroidering all thread cutting and -klemmvorrichtungen be swiveled with each stitch, for example 600-700 times per minute together with the fabric pressers. This means that a large mass always needs to be accelerated and decelerated 600-700 times per minute. This can be too

Vibrations, noise and increased wear of the

Embroidery machine lead. Furthermore, the disadvantage of this device is that the threads are cut relatively far away from the tap hole plate or the embroidery material lying thereon, which causes a higher consumption of thread and also the thread ends of the embroidery material must be removed later. It has also proved to be disadvantageous that clamped threads, if not required, can be released by moving knives or grippers together.

An object of the present invention is to provide a thread cutting and clamping device for the front

200419WO - 22.06.2017 Needle threads on a large embroidery machine, with which only the threads can be cut and clamped at the selected embroidery sites.

Another object is to provide a thread cutting and clamping device with which the threads to be cut can be cut very close to the stitch hole plate.

Another object of the invention is to provide a simple drive arrangement for the selected active thread cutting and clamping devices.

Another object is to make the thread cutting and clamping elements individually interchangeable.

The task is solved by an embroidery machine

Front thread cutting and clamping devices according to the features of patent claim 1.

Advantageous embodiments of the embroidery machine are described in the dependent claims. Through the use of individually activatable and

deactivatable thread cutting and clamping elements which are arranged on a pivotable independently of the fabric presser sheet carrier profile, the needle threads can be cut and securely clamped in each case at the temporarily out of operation to be taken embroidery sites. The carrier profile with the thread cutting and clamping elements mounted thereon is only in the direction of

200419WO - 22.06.2017 Taphole plate pivoted when a cutting operation is necessary and remains in rest position during embroidering. Also, the knives are only pressed at the required embroidery sites, so that the

Wear of the knife can be kept to a minimum. Defective or worn blades can

Replacement of individual thread cutting and clamping elements are removed from the carrier profile without tools and replaced. As a result, the downtime of the embroidery machine is shortened by a multiple and the cost of replacement are kept to a minimum compared to the known

Device reduced. Through the education of

Fadenschneid- and -klemmelemente, which are individually operable, the festzuklemmende thread end over a

sufficiently long thread length are kept clamped, so that later tedious threading is eliminated. Setting up the machine, that means threading in one

Changing products, in which other or different colored threads must be presented, is greatly simplified because the new threads in a simple way from the top of the

Clamping device inserted and then by one-time

Operation of the thread cutting and -klemmvorrichtung the protruding thread ends can be cut away and thus have the same status as previously cut threads.

200419WO - 22.06.2017 Reference to an embodiment of the invention will be described and illustrated in the figures.

a vertical partial cross section through the Stöckli, the stitch hole plate and the

Needle car of a big embroidery machine,

Thread cutting and clamping device in

Rest position,

Needle car of a big embroidery machine,

Thread cutting and clamping device in

Working position,

a perspective view of

Support plate, the drive plate and the drive members for the drive plate without thread cutting and clamping elements from the front, a perspective view of

Support plate, the drive plate and the drive members for the drive plate without thread cutting and -klemmelemente from behind, a perspective view of

Thread cutting and clamping elements in

Isolation,

200419WO - 22.06.2017 a side view of the thread cutting and -klemmelements,

a side view of the thread cutting and -klemmelements immediately before

Connection with the carrier plate,

a perspective view of

Section of the carrier plate with two thread cutting and clamping elements in

Rest position,

a plan view of a section of the carrier plate with two arranged on it thread cutting and clamping elements in

Rest position,

a side view of the elements in Figure 6a in catching and cutting position, a perspective view of

Cutout of the backing plate with two

Thread cutting and clamping elements in

Rest position,

a plan view of a section of the support plate with two thread cutting and clamping elements arranged thereon in catching and cutting position,

a side view of the elements in Figure 7a in catching and cutting position,

200419WO - 22.06.2017 Figure 7c is a perspective view of the

Cutout of the backing plate with two

Thread cutting and clamping elements in catching and cutting position,

Figure 8a is a plan view of a section of

Support plate with two arranged on it thread cutting and clamping elements of

Drive decoupled,

FIG. 8b shows a side view of the elements in FIG. 8a disconnected from the drive,

Figure 8c is a perspective view of the

Cutout of the backing plate with two

Thread cutting and clamping elements from

Drive decoupled.

FIGS. 1 and 2 show the elements necessary for understanding the invention in a large shuttle embroidery machine. In particular, in these figures, the arrangement of a thread cutting and -klemmvorrichtung for cutting and clamping the needle or front threads, hereinafter called thread cutting and - clamping device 1, with respect to their position between the Stöckli 3 and the needle carriage 5 can be seen. The

Stöckli 3 is about an axis, not shown in

Slidable needle direction to improve the accessibility of the embroidery ground 7 between the needle plate 9 and the needle 15. Between the embroidery base 7 and the

200419WO - 22.06.2017 Stöckli 3, the tap hole plate 9 is arranged. Boats in the shuttle 11 in Stöckli 3 are omitted for the sake of clarity.

On the right side of the embroidery base 7, a needle 13, held by the needle holder 15, can be seen above.

Below the needle 13 is a drill 17, held by the drill holder 19. The drive of the needle 13 via a Nadelpleuel 21; the drive of the drill 17 via a Bohrerpleuel 23. The cranked ends 25 of the Nadelpleuels 21 and the end 27 of the Bohrerpleuels 23 are held pressed by torsion springs to pivotally mounted cylindrical shafts 29 and 31 respectively. In the following, a slider 33 can be seen, which is displaceable substantially axially forward and backward by a linear drive 34. On the slider 33, a first wedge 35 and a second wedge 37 are fixed, the inclined ramp-shaped surfaces with the free ends of the cranked ends 25 and 27 are in contact. The front, arranged at the left end of the slider 33 end 41 is bent or T-shaped and is in contact with an angle lever or a rocker 43, the part of

Thread cutting and clamping device 1 or a

Thread cutting and -klemmelements 55 and at this about an axis B (Fig. 4) is pivotable. The device 1 is pivotable about a shaft C on a shaft 42

stored. The pivot drive in the direction of the arrows P is not shown for the sake of clarity,

200419WO - 22.06.2017 or for the most part hidden The device 1 further comprises a support plate 45, at which at regular intervals, which the distances of the needles 13 of the

Embroidery machine correspond, keyhole-like

Recesses 47 are recessed.

In FIGS. 3a and 3b, in front of the carrier plate 45, which extends in one piece or in several sections, extends along the embroidery machine, a drive profile 49 in the form of a multi-embroidery point

extending metal profile arranged. The drive profile 49 can by pushing rods 51 in the vertical direction

(Arrows f) are moved up and down and is with

Guide pins carried in slots 46 guided in the support plate 45. The push rods 51 are driven by a drive means 53 not further described. In Figures 3a and 3b, the better

For clarity, the thread cutting and - clamping elements 55, which are arranged on the support plate 45, omitted. These are described below with reference to FIG. 4 and following.

In the perspective view of the thread cutting and -klemmelements 55 in Figure 4, the structure of the same is shown in detail. An elongated

Slider plate 57 carries the necessary for cutting and clamping other elements such as a clamping plate 59, a

200419WO - 22.06.2017 Cutting knife 61 and a fishing hook 63. The fishing hook 63 and the cutting blade 61 are mounted longitudinally displaceable in a guide housing 65 between the clamping plate 59 and the slide plate 57. The guide housing 65 is fastened to the slide plate 57, for example, by means of two screw connections 67. Preferably, the

Clamping plate 59 clamped in a slot 69 in the guide housing 65 and the screw 67th

kept penetrated.

In addition, below the guide housing 65 a

Carriage 71 guided longitudinally in a slot-shaped recess 73 in the slide plate 57. The attachment of the carriage 71 is effected by a longitudinally section T-shaped sleeve 75, the flange surface on the outside of the

slotted recess 73 rests and is secured by a threaded bolt 77 and a nut 79 on the carriage 71. Between the upper end 81 of the carriage 71 and the lower end 83 of the guide housing 65, a coil spring 85 is clamped. Their end turns are held in bores on the guide housing 65 and in the carriage 71. By the coil spring 85 is the

Sled 71 pressed by spring force down until the neck of the T-shaped sleeve 75 at the lower end of the

slit-shaped recess 73 reaches the end position.

On the carriage 71 is further a rocker 87 on a slide 71 penetrating pin 89 pivotally

stored. The rocker 87 includes two parallel to each other

200419WO - 22.06.2017 arranged legs 91, which are approximately in the middle of

Bolt 89 to be broken. At the upper end of the two legs 91 preferably nose-shaped end portions 93 are formed. The lower ends of the legs 91 are interconnected by a web 95 and form a flat bottom edge 111th

The rocker 87 is pivoted with its web 95 in a clockwise direction with a leg spring 97 wound around the bolt 89, so that the web 95 is pressed against a bracket 99. The boom 99 is either part of the

Carriage 71 or attached to this and projects, parallel to the slide plate 57 running down. The lower end of the boom 99 is cranked by 90 °. The cranked end 101 of the boom 99 protrudes in the direction of

Slider plate 57. In the lower region or at the lower end a keyhole-shaped recess 103 is formed in the slide plate 57.

The overhead narrow side of the slide plate 57 is, in Figure 4 on the right side, provided with a razor sharp cutting edge 105. Between

Ends of the slide plate 57 and the clamping plate 59 are the substantially at right angles extending upper end of the cutting blade 61 and the substantially rectangular end of the fishing hook 63rd

held clamped (see also Fig. 7a and Fig. 7c).

200419WO - 22.06.2017 In the figures 5a-5c is the thread cutting and

Clamping element 55 shown in side elevation. The

Thread cutting and clamping element 55 is on the

Support plate 45 attached. The attachment on the

Carrier plate 45 is made by passing the T-shaped sleeve 75 through the keyhole-shaped

Recess 47 (see Fig. 3a-3b) and is provided with a

Clamping screw 107, which in the second

keyhole-shaped recess 103 recessed on the support plate 45, positively connected. In Figure 5b, the thread cutting and clamping element 55 is shown spaced from the support plate 45. In FIGS. 6a-6c, the latching has taken place by a displacement of the thread cutting and clamping element 55 in the upward direction. With the clamping screw 107 is the definitive, however

sliding attachment of the two elements to the

Support plate 45. In the figure 6c is further seen that the boom 99 and the cranked end 101 engages in an opening 109 in the drive profile 49. The upper portion of the drive profile 49 above the opening 109 fills the space between the hook-shaped end 101 of the boom 99 and the lower edge 111 of the carriage 71 from. The thread cutting and clamping element 55 or its carriage 71 is thereby connected to the drive profile 49 substantially free of play. It can therefore with the

Drive profile 49 of the carriage 71 in the vertical direction

200419WO - 22.06.2017 and moved against the force of the coil spring 85 upwards.

The drive profile 49 is connected to the push rod 51 (see also FIG. 3). The push rod 51 is in turn connected to a drive means in the form of a pivot lever, which is pivotable about a pivot axis A. The drive means or the pivot lever is not with

pivotable means and thus the push rod 51 substantially vertically upwards or downwards

displaceable. With the push rod 51, the

Drive profile 49 are moved in parallel in the vertical direction. With this the thread cutting and

-klemmelemente 55, which are engaged on the drive profile 49, also moved vertically, provided that the cranked end 101 engages the arm 99 in the opening 109 and thereby the movement of the drive profile 49 on the

Carriage 71 is transmitted. With the carriage 71, to which the boom 99 is attached, are on a first path when moving vertically the

latched thread cutting and clamping elements 55 as shown in FIG. 4, a first path far moved up. Thus, in the first leg, all are activated

Thread cutting and clamping elements 55 a piece upwards towards embroidery bottom (see Fig. 2) moves. Will that be

Drive profile 49 moved further, so are the

Cutting knife 61 and the fishing hook 63 by the same

200419WO - 22.06.2017 Amount moved. The slide plate 57 and the

But clamping plate 59 remain stationary (Figures 7a-7c). At the end of the first path, the clamping screw 107 now comes into abutment with the upper end of the recess in the slide plate 45. During further displacement of the

Thread cutting and -klemmelements 55 shifts only the carriage 71, the cutting blade 61 and the

Fanghaken 63. Consequently, only the one in the im

Substantially right-angled end portions of the cutting blade 61 and the catch hook 63 on the sharp edge of the slide plate 57 and the upper edge of the

Clamp 59 out.

FIGS. 8a-8c show a further functional position of the thread cutting and clamping element 55. By a force F with a linear drive 34 on the end portion 93 on the upper leg 91 of the rocker 87, the latter is pivoted counterclockwise about the axis of the bolt 89. Due to the pivotal movement of the rocker 87, the lower edge 111 of the lower leg of the rocker 87 moves out of the effective range of the drive profile 49. As a result, when reaching the drive profile 49, the lower edge 111 no longer comes into contact with the drive profile 49 and consequently the rocker 87 does not move upwards and remains or remains in the lower position. As a result of the rocker 87 no longer traveling upwards with the carriage 71, the cutting blade 61 and the catching hook 63 also remain

200419WO - 22.06.2017 in the position between the slide plate 57 and the clamping plate 59 or the whole element remains passive, a possibly trapped thread is kept clamped. The mode of operation of the thread cutting and clamping device 1 will be explained below with reference to the figures. Based on the positioning of the device 1 according to Figure 1, the upper end of the slide plate 57 is further away from the tap hole plate 9 as a presser foot or the

Fabric pawls 113. The positioning of the individual elements of the thread cutting and clamping element 55

corresponds to that in Figures 6a-6c. In these positions of the device, the embroidery machine

be shut down or it may be the embroidery process

be made, that is, the stitch formation can take place and the Stoffdrückertatzen 113, needles 13, etc. may be accordingly in motion.

In the case of a thread change, ie the stopping of an embroidery point and the commissioning of another

The machine stops (needles from the fabric, fabric presser open, etc.) and it becomes the

Carrier plate 45 in the counterclockwise direction about axis C.

pivoted. The upper end of the slide plate 57 thereby moves in the vicinity of the tap hole plate 9 in order to cut as possible from the embroidery on the needle plate 9 needle hole leading needle thread as close to the embroidery. At the end of the pivotal movement of the support plate 45th

200419WO - 22.06.2017 and the first upward movement of thread cutting and - clamping member 55 is the fishing hook 63 and the cutting blade 61 between the slide plate 57 and the clamping plate 59, as shown in Figures 6a-6c near the embroidery ground 7. Subsequently, the

Cutting process of the respective needle thread or the respective needle threads by the drive profile 49 first in the direction of arrow f upwards

is moved. By pushing up the

Drive profile 49, the carriage 71 are pushed relative to the support plate 45 upwards and with this also the fishing hook 63 and the cutting blade 61. At the same time, the spring 85 is tensioned. By a relative movement of the gate of the embroidery machine (gate not shown) of the needle thread or the needle threads, the of

Stick base 7 to the needle 13 and the needles 13 extend, in the capture area or the capture areas, that is guided under the horizontally extending legs of the cutting blade 61 and the fishing hook 63. Now that lowers

Drive profile 49 in the direction of the arrow f down. Then, on the one hand reaches the area of the needle thread, which leads from the needle 13 to the embroidery ground 7, between the downwardly moving catch hook 63 and the clamping plate 59 and is thereby clamped and held over a longer distance between these two elements. The from the

Embroidery material in the direction of needle 13 leading thread section becomes in this movement at the cutting edge 105 of the

200419WO - 22.06.2017 Slider plate 57 and the cutting edge on the cutting blade 61 cut close to the embroidery. The cutting operation is assisted by the force of the relaxing spring 85. After this cutting operation, the carrier plate 45 with the thread cutting and clamping elements 55 attached thereto can be completely moved back into the starting position. The coming of the needle 13 yarn ends between the fishing hook 63 and the clamping plate 59 remain securely clamped.

If not all threads have to be cut at the same time, at those embroidery points where the needle threads are not to be cut, the

Thread cutting and clamping elements 55 temporarily taken out of service as follows. With the aid of the slider 33 and the bent part arranged at its front end 41, according to FIGS. 8a-8c, the upper part of the rocker 87 is pivoted in the direction of the carrier plate 45. This can during the subsequent startup of the

Drive profile 49 of the carriage 71 are no longer raised, because the drive profile 49 no longer strikes from below on the web 95 of the rocker 87 and the carriage 71 is not moved. Consequently, the catch hook 63 and the cutting blade 61 can not be moved beyond the clamp plate 49 and the slide plate 57, respectively. During the next cutting process, although the thread cutting and - clamp element 55 with the adjacent elements for

200419WO - 22.06.2017 Stitch hole plate 9 moves towards, but the leading from the embroidery to the needles 13 threads can not be detected and consequently not cut.

200419WO - 22.06.2017

Claims

claims

1. embroidery machine, in particular shuttle embroidery machine with embroidery needles (13) and their drives and with a device (1) for cutting and clamping the front threads, comprising at each embroidery point one for the there to be cut front thread formed thread cutting and -klemmelement (55) Cutting and clamping the thread leading from the needle (13) to the embroidery material in front of the needle plate (9), wherein the

Thread cutting and clamping elements (55) on at least one support plate (45) are individually engageable in a cutting and clamping position, wherein the thread cutting and -klemmelemente (55) with a

Drive profile (49) with at least one

Drive means (53) are temporarily switched on and off, with each individual thread cutting and - clamp element (55) on and disengaged with the

Drive profile (49) is formed connectable, wherein the carrier plate (45) together with the thereon

slidably disposed drive profile (49) is pivotally mounted about a horizontal axis C, wherein the drive means (53) is pivotally connected to the support plate (45),

characterized in that

200419WO - 22.06.2017 each thread cutting and clamping element (55) a

Slider plate (57), on which a carriage (71) is slidably mounted.

Embroidery machine according to claim 1, characterized in that the carriage (71) against the force of a spring (85) which is supported on or in a guide housing (65) on the slide plate (57) on the

Slide plate (57) is displaceable.

Embroidery machine according to claim 2, characterized in that the carriage (71) at the back with the shaft of at least one T-shaped sleeve (75) in at least one slot-shaped recess (73) in the

Slide plate (57) and with the attached to the carriage (71) ends of a cutting blade (61) and a catch hook (63), which in turn are guided in the guide housing, is displaceable. 4. Embroidery machine according to one of claims 2 or 3,

characterized in that on the carriage (71) on the thread cutting and clamping elements (55) is articulated about a horizontal axis pivotable rocker (87), with which the connection of the rocker (87) with the drive profile (49) produced or is solvable.

200419WO - 22.06.2017 Embroidery machine according to claim 4, characterized in that the lower designed as a web (95) end (101) of the rocker (87) by a leg spring (97) to the lower end of the carriage (71) can be pressed.

Embroidery machine according to one of claims 4 or 5, characterized in that the lower end (101) of the carriage (71) is formed hook-shaped cranked.

Embroidery machine according to one of claims 2 to 6, characterized in that on the guide housing (65) a clamping plate (59) is fixed, which in

Essentially parallel to the upper area of the

Slider plate (57) extends and that between the upper end portions of the slide plate (57) and the clamping plate (59), the upper ends of the cutting blade (61) and the catch hook (63) are arranged.

8. Embroidery machine according to claim 7, characterized in that the upper edge of each cutting blade (61)

is formed hook-shaped and whose cutting edge is located at the lower edge of the hook portion and that the upper end of the slide plate (57) on which the

Cutting blade (61) abuts, as a cutting edge (61 ^λ )

is designed.

200419WO - 22.06.2017

9. Embroidery machine according to one of claims 7 or 8, characterized in that the clamping plate (59) resiliently abuts the fishing hook (63).

Embroidery machine according to one of claims 5 to 9, characterized in that the carriage (71) on the slide plate (57) on the web (95) on the rocker (87) by the on the web (95) adjacent the drive profile (49) upwardly displaceable is and that while doing that

Cutting knife (61) and the fishing hook (63) beyond the ends of the slide plate (57) and the clamping plate (59) are pushed out, so that the hook-shaped ends of the cutting blade (61) and the fishing hook (63) are exposed

Embroidery machine according to claim 10, characterized

characterized in that the carriage (71) is displaceable upwards against the force of a spring (85) and by the force of the spring (85) for cutting and

Clamps of the needle thread is displaced downwards.

12. Embroidery machine according to claim 10 or 11, characterized

in that, when the rocker (87) is pivoted, the drive profile (49) is disengaged from the web (95) on the rocker (87) and with the carriage (71) and conceals the cutting blade (61) and the catch hook (63)

200419WO - 22.06.2017 between the ends of the slide plate (57) and the clamping plate (59) lie.

Embroidery machine according to one of claims 4 to 12, characterized in that on the needle carriage (5) drive means for individual shutdown of individual embroidery sites are arranged.

14. Embroidery machine according to claim 13, characterized

characterized in that on the needle carriage (5)

Drive members for individually pivoting the rockers (87) on the thread cutting and clamping elements (55) are arranged and / or that are used as drive members, the linear drives (34) for the decommissioning of the needles (13).

15. An embroidery machine according to claim 1, characterized in that a cutting blade (61) and a fishing hook (63) on the thread cutting and -klemmelement (55) by the force of a spring (85) for clamping and cutting the

Thread relatively movable from the cutting and

Clamping position are arranged.

200419WO - 22.06.2017