CH712727A1 - Embroidery machine, in particular shuttle embroidery machine. - Google Patents

Abstract

The embroidery machine includes a thread cutting and clamping device for cutting and clamping the needle threads. For each embroidery point, an autonomous thread cutting and clamping element (55) is arranged on a carrier plate (45) and can be driven. Each individual thread cutting and clamping element (55) can be switched on and off individually by a drive.

Description

The invention relates to an embroidery machine, in particular a shuttle embroidery machine according to the preamble of patent claim 1.

[0002] EP 0 768 418 describes a front thread cutting and clamping device for cutting through the front threads, also called needle threads, in which a knife ruler is arranged so as to be displaceable in the vertical direction on the presser plate on which the presser fingers or paws are formed , Thread catchers with angled ends are arranged on this knife ruler and are designed to catch the needle threads that lead from the needle to the embroidery material. Furthermore, hook-shaped knives are formed on the knife ruler, which cut the thread caught by the catch hook on a cutting edge or cutting edge which is formed on the presser plate when the latter is guided downward relative to the presser plate. With this known device, all threads running between the embroidery material and the needles can be cut at the same time and the thread end coming from the needles can also be clamped to a device after cutting so that when the embroidery process is resumed at the relevant embroidery site, the thread does not re-enter Eye of the needle must be threaded. With this device, the threads can be cut perfectly and temporarily clamped essentially securely. A disadvantage of this device, however, is that all threads are always cut at the same time and not only those that are in the current embroidery process. Another disadvantage of the known device is that when embroidering, all thread cutting and clamping devices are swiveled together with the presser for each stitch, for example 600-700 times per minute. This means that a large mass must always be accelerated and decelerated 600-700 times per minute. This can lead to vibrations, noise and increased wear on the embroidery machine. Furthermore, the disadvantage of this device is that the threads are cut relatively far away from the needle plate or the embroidery material lying thereon, which causes a higher consumption of thread and, moreover, the thread ends on the embroidery material have to be removed later. It has also proven to be disadvantageous that clamped threads, if not required, can be released again by moving the knife or gripper together.

An object of the present invention is to provide a thread cutting and clamping device for the front or 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 create a thread cutting and clamping device with which the threads to be cut can be cut very close to the needle plate.

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

Another task is to make the thread cutting and clamping elements individually replaceable.

The object is achieved by an embroidery machine with front thread cutting and clamping devices according to the features of claim 1.

Advantageous configurations 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 support profile independent of the presser plate, the needle threads can be cut and securely clamped at the embroidery points that are to be temporarily taken out of operation. The carrier profile with the thread cutting and clamping elements attached to it is only pivoted in the direction of the needle plate when a cutting process is necessary and remains in the rest position during embroidery. The knives are only operated at the required embroidery points so that the wear of the knives can be kept to a minimum. Defective or worn knives can be removed from the carrier profile and replaced without tools by exchanging individual thread cutting and clamping elements. As a result, the downtime of the embroidery machine is shortened many times over and the costs for the replacement are reduced to a minimum in comparison with the known device. By designing the thread cutting and clamping elements, which can be actuated individually, the thread end to be clamped can be held clamped over a sufficiently large thread length, so that laborious threading later is eliminated. Setting up the machine, i.e. threading when changing products, in which different or differently colored threads have to be presented, is considerably simplified since the new threads are simply inserted from above into the clamping device and then by actuating the thread cutting and the protruding thread ends can be cut away and thus have the same status as previously cut threads.

Using an exemplary embodiment, the invention is described and shown in the figures.

[0007] The figures show:

1 is a partial vertical cross section through the Stöckli, the tap hole plate and the needle carriage of a large embroidery machine, thread cutting and clamping device in the rest position,

CH 712 727 A1

2 is a partial vertical cross section through the Stöckli, the needle plate and the needle carriage of a large embroidery machine, thread cutting and clamping device in the working position,

3a is a perspective view of the carrier plate, the drive plate and the drive members for the drive plate without thread cutting and clamping elements from the front,

3b is a perspective view of the carrier plate, the drive plate and the drive elements for the drive plate without thread cutting and clamping elements from behind,

4 is a perspective view of the thread cutting and clamping element in isolation,

5a is a side view of the thread cutting and clamping element,

5b is a side view of the thread cutting and clamping element immediately before connection to the carrier plate,

5c is a perspective view of the detail of the carrier plate with two thread cutting and clamping elements in the rest position,

6a is a plan view of a section of the carrier plate with two thread cutting and clamping elements arranged thereon in the rest position,

6b is a side view of the elements in Fig. 6a in the catching and cutting position,

6c is a perspective view of the detail of the carrier plate with two thread cutting and clamping elements in the rest position,

7a is a plan view of a section of the carrier plate with two thread cutting and clamping elements arranged thereon in the catching and cutting position,

7b is a side view of the elements in Fig. 7a in the catching and cutting position,

7c is a perspective view of the detail of the carrier plate with two thread cutting and clamping elements in the catching and cutting position,

8a a top view of a section of the carrier plate with two thread cutting and clamping elements arranged thereon uncoupled from the drive,

8b is a side view of the elements in Fig. 8a decoupled from the drive,

Fig. 8c is a perspective view of the section of the carrier plate with two thread cutting and clamping elements decoupled from the drive.

1 and 2, the elements necessary for understanding the invention are shown in a large shuttle embroidery machine. In particular, in these figures the arrangement of a thread cutting and clamping device for cutting and clamping the needle or front threads, hereinafter referred to as thread cutting and clamping device 1, can be seen with regard to their position between the stock 3 and the needle carriage 5. The Stöckli 3 can be moved in the needle direction about an axis, not shown, in order to improve the accessibility of the embroidery base 7 between the needle plate 9 and the needle 15. The needle plate 9 is arranged between the embroidery base 7 and the Stöckli 3. Shuttles in the shuttle train 11 in the 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 at the top.

Below the needle 13 is a drill 17, held by the drill holder 19. The needle 13 is driven by a needle connecting rod 21; the drive of the drill 17 takes place via a drill connecting rod 23. The cranked ends 25 of the needle connecting rod 21 and end 27 of the drill connecting rod 23 are pressed by leg springs onto pivotably mounted cylindrical shafts 29 and 31, respectively. Furthermore, a slide 33 can be seen, which can be displaced essentially axially forwards and backwards by a linear drive 34. A first wedge 35 and a second wedge 37 are fastened to the slide 33, the inclined ramp-shaped surfaces of which are in contact with the free ends of the cranked ends 25 and 27, respectively. The front end 41 arranged at the left end of the slide 33 is cranked or T-shaped and is in contact with an angle lever or a rocker 43 which is part of the thread cutting and clamping device 1 or a thread cutting and clamping element 55 and on this is pivotable about an axis B (Fig. 4}. The device 1 is pivotally mounted on a shaft 42 about an axis C. For the sake of clarity, the pivoting drive in the direction of the arrows P is not shown, or is largely covered by the die Device 1 further comprises a carrier plate 45, on which keyhole-like recesses 47 are made at regular intervals, which correspond to the distances of the needles 13 of the embroidery machine.

3a and 3b, a drive profile 49 is arranged in front of the carrier plate 45, which extends in one piece or divided into several sections along the embroidery machine, in the form of a metal profile extending over several embroidery points. The drive profile 49 can be moved up and down in the vertical direction (arrows f) by push rods 51 and is guided with guide pins in slots 46 in the carrier plate 45. The push rods 51 are driven by a drive means 53 which is not further described. 3a and 3b, for the sake of clarity, the thread cutting and clamping elements 55, which are arranged on the carrier plate 45, are omitted. These are described below with reference to FIGS. 4 and the following.

In the perspective view of the thread cutting and clamping element 55 in Fig. 4, the structure of the same is shown in detail. An elongated slide plate 57 carries the further elements necessary for cutting and clamping, such as a clamping plate 59, a cutting knife 61 and a catch hook 63. The catch hook 63 and the cutting knife 61 are mounted in a guide housing 65 so as to be longitudinally displaceable 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. The clamping plate 59 is preferably clamped in a slot 69 in the guide housing 65 and held through by the screw connections 67.

Furthermore, a slide 71 is guided longitudinally in a slot-shaped recess 73 in the slide plate 57 below the guide housing 65. The carriage 71 is fastened by a sleeve 75 which is T-shaped in longitudinal section, the flange surface of which rests on the outside on the slot-shaped recess 73 and is fastened to the carriage 71 by means of a threaded bolt 77 and a nut 79. A coil spring 85 is clamped between the upper end 81 of the slide 71 and the lower end 83 of the guide housing 65. Their end turns are held in bores on the guide housing 65 and in the carriage 71. The helical spring 85 pushes the slide 71 downwards by spring force until the neck of the T-shaped sleeve 75 reaches the end position at the lower end of the slot-shaped recess 73.

A rocker 87 is also pivotally mounted on the slide 71 on a bolt 89 penetrating the slide 71. The rocker 87 comprises two legs 91 arranged parallel to each other, which are pierced approximately in the middle by the bolt 89. Nose-shaped end regions 93 are preferably formed at the upper end of the two legs 91. The lower ends of the legs 91 are connected to one another by a web 95 and form a flat lower edge 111. With a leg spring 97 wrapping around the bolt 89, the rocker 87 is pivoted clockwise with its web 95, so that the web 95 is pressed against a boom 99 becomes. The cantilever 99 is either part of the carriage 71 or fastened to it and projects downward, running parallel to the slide plate 57. The lower end of the boom 99 is bent by 90 °. The cranked end 101 of the arm 99 projects in the direction of the slide plate 57. In the lower region or at the lower end, a keyhole-shaped recess 103 is formed in the slide plate 57.

The upper narrow side of the slide plate 57 is provided with a razor-sharp cutting edge 105 in FIG. 4 on the right side. Between the ends of the slide plate 57 and the clamping plate 59, the upper end of the cutting knife 61, which runs essentially at a right angle, and the end of the catch hook 63, which is essentially at right angles, are held clamped (cf. also FIGS. 7a and 7c).

5a-5c, the thread cutting and clamping element 55 is shown in side elevation. The thread cutting and clamping element 55 is fastened on the carrier plate 45. The attachment to the carrier plate 45 is carried out by passing the T-shaped sleeve 75 through the keyhole-shaped recess 47 (see FIGS. 3a-3b) and is positively connected with a clamping screw 107, which is inserted in the second keyhole-shaped recess 103 on the carrier plate 45 , 5b shows the thread cutting and clamping element 55 at a distance from the carrier plate 45. 6a-6c, the engagement has taken place by a displacement of the thread cutting and clamping element 55 in the upward direction. The clamping screw 107 is used to secure the two elements to the support plate 45 in a definite but slidable manner. In FIG. 6c it can also be seen that the arm 99 or the cranked end 101 engages in an opening 109 in the drive profile 49. The upper area of the drive profile 49 above the opening 109 fills the space between the hook-shaped end 101 of the arm 99 and the lower edge 111 of the slide 71. The thread cutting and clamping element 55 or its slide 71 is thereby connected to the drive profile 49 essentially without play. It can thus be moved with the drive profile 49 of the carriage 71 in the vertical direction and 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 pivoting lever can be pivoted by means not shown and thus the push rod 51 can be displaced essentially vertically upwards or downwards. With the push rod 51, the drive profile 49 can be moved in parallel in the vertical direction. With this, the thread cutting and clamping elements 55, which are engaged on the drive profile 49, are also moved vertically, provided that the cranked end 101 on the arm 99 engages in the opening 109 and the movement of the drive profile 49 is thereby transmitted to the carriage 71. With the slide 71, to which the arm 99 is fastened, the engaged thread cutting and clamping elements 55 according to FIG. 4 are moved a first distance upwards on a first path during vertical movement. Thus, in the first path, all activated thread cutting and clamping elements 55 are moved a little upwards in the direction of the embroidery floor (see FIG. 2). If the drive profile 49 is moved further, the cutting knife 61 and the catch hook 63 are also shifted by the same amount. The slide plate 57 and the clamping plate 59 remain stationary (FIGS. 7a-7c). At the

CH 712 727 A1

At the end of the first path, the clamping screw 107 comes into contact with the upper end of the recess in the slide plate 45. When the thread cutting and clamping element 55 is moved further, only the carriage 71, the cutting knife 61 and the catch hook 63 move consequently, only the end regions of the cutting knife 61 or the catch hook 63, which extend essentially at right angles, beyond the sharp edge of the slide plate 57 and the upper edge of the clamping plate 59.

8a-8c, a further functional position of the thread cutting and clamping element 55 is shown. By a force F with a linear drive 34 on the end region 93 on the upper leg 91 of the rocker 87, the rocker 87 is pivoted counterclockwise about the axis of the bolt 89. Due to the pivoting movement of the rocker 87, the lower edge III of the lower leg of the rocker 87 moves out of the effective range of the drive profile 49. As a result, when the drive profile 49 is raised, 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. Because the rocker 87 no longer moves upwards with the slide 71, the cutting knife 61 and the catch hook 63 also remain in the position between the slide plate 57 and the clamping plate 59 or the entire element remains passive, a possibly jammed thread remains clamped held.

The operation of the thread cutting and clamping device 1 is explained below with reference to the figures. Starting from the positioning of the device 1 according to FIG. 1, the upper end of the slide plate 57 lies further away from the tap hole plate 9 than a presser or presser paws 113. The positioning of the individual elements of the thread cutting and clamping element 55 corresponds to that in FIGS 6a-6c. In these positions of the device, the embroidery machine can be stopped or the embroidery process can be carried out, that is, the stitch formation can take place and the presser paws 113, needles 13, etc. can be moved accordingly.

When changing the thread, i.e. stopping one embroidery point and starting up another embroidery point, the machine stops (needles made of the fabric, presser open, etc.) and the carrier plate 45 is pivoted counterclockwise about the C axis. The upper end of the slide plate 57 thereby moves in the vicinity of the needle plate 9 in order to be able to cut through the needle thread leading from the embroidery material on the needle plate 9 to the eye of the needle as close as possible to the embroidery material. At the end of the pivoting movement of the carrier plate 45 and the first upward movement of the thread cutting and clamping element 55, the catch hook 63 and the cutting knife 61 are located between the slide plate 57 and the clamping plate 59, as shown in FIGS. 6a-6c, near the embroidery base 7. The cutting process of the relevant needle thread or the relevant needle threads then takes place by first moving the drive profile 49 further upward in the direction of the arrow f. By pushing the drive profile 49 upward, the slides 71 are pushed upward relative to the carrier plate 45 and with it the catch hook 63 and the cutting knife 61. At the same time, the spring 85 is tensioned. By a relative movement of the gate of the embroidery machine (gate not shown), the needle thread or the needle threads, which run from the embroidery base 7 to the needle 13 or the needles 13, into the catch area or the catch areas, i.e. under the horizontally extending legs of the Cutting knife 61 and the catch hook 63 performed. Now the drive profile 49 lowers in the direction of arrow f. Then, on the one hand, the area of the needle thread that leads from the needle 13 to the embroidery base 7 passes between the downward moving hooks 63 and the clamping plate 59 and is clamped and held over a longer distance between these two elements. The thread section leading from the embroidery material in the direction of the needle 13 is cut during this movement on the cutting edge 105 of the slide plate 57 and the cutting edge on the cutting knife 61 near the embroidery material. The cutting process is supported by the force of the relaxing spring 85. After this cutting process, the carrier plate 45 with the thread cutting and clamping elements 55 attached to it can be moved completely back into the starting position. The thread ends coming from the needle 13 remain securely clamped between the catch hook 63 and the clamping plate 59.

If not all threads have to be cut at the same time, the thread cutting and clamping elements 55 are temporarily taken out of operation as follows at those embroidery sites where the needle threads are not to be cut. 8a-8c, the upper part of the rocker 87 is pivoted in the direction of the carrier plate 45 with the aid of the slide 33 and the bent part arranged at its front end 41. As a result, when the drive profile 49 is subsequently raised, the slide 71 can no longer be raised because the drive profile 49 no longer strikes the web 95 of the rocker 87 from below and the slide 71 is not moved. Consequently, the catch hook 63 and the cutting knife 61 cannot be moved beyond the clamping plate 49 or the slide plate 57. In the next cutting process, the thread cutting and clamping element 55 is moved with the adjacent elements to the needle plate 9, but the threads leading from the embroidery material to the needles 13 cannot be detected and consequently cannot be cut.

Legend of the Reference Numbers [0016]

Thread cutting and clamping device

stöckli

needle car

CH 712 727 A1

embroidery ground

Needle plate

shuttle race

needle

needle holder

drill

drill holder

Nadelpleuel

Drill connecting rods cranked end of 21 cranked end of 23 cylindrical shaft cylindrical shaft

pusher

linear actuator

1st wedge

2nd wedge

End of 33

wave

Angle lever / rocker

support plate

guide slot

recess

drive profile

pushrod

drive means

Thread cutting and clamping element

slide plate

clamp

cutting blade

cutting edge

hook

guide housing

Scrubbing action

slot

carriage

CH 712 727 A1 slot-shaped recess 75 T-shaped sleeve

threaded bolt

Mother top end bottom end

coil spring

seesaw

bolt

leg

end

web

Leg spring

boom

101 cranked end

103 keyhole-shaped recess

105 sharp edge

107 clamping screw

109 opening

III lower edge of 71

113 presser paw

A swivel axis

B Swivel axis of rocker 87

C swivel axis

F force g direction p swivel movement

Claims (20)

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 site a thread cutting and clamping element (55) designed for the front thread to be cut there Cutting and clamping of the thread leading from the needle (13) to the embroidery material in front of the needle plate (9), characterized in that the thread cutting and clamping elements (55) are individually displaceably arranged in a cutting and clamping position on at least one carrier plate (45) are. 2. Embroidery machine according to claim 1, characterized in that the thread cutting and clamping elements (55) with a drive profile (49) with at least one drive means (53) can be temporarily switched on and off. 3. Embroidery machine according to claim 2, characterized in that each individual thread cutting and clamping element (55) can be connected and disengaged with the drive profile (49). CH 712 727 A1 4. Embroidery machine according to claim 2 or 3, characterized in that the carrier plate (45) is pivotally mounted about a horizontal axis C together with the drive profile (49) which is displaceably arranged thereon. 5. Embroidery machine according to claim 3, characterized in that the drive means (53) is articulated to the carrier plate (45). 6. Embroidery machine according to one of claims 1 to 5, characterized in that each thread cutting and clamping element (55) comprises a slide plate (57) on which a carriage (71) is slidably mounted. 7. Embroidery machine according to claim 6, 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. 8. Embroidery machine according to claim 7, characterized in that the carriage (71) on 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 on the carriage (71 ) attached ends of a cutting knife (61) and a catch hook (63), which in turn are guided in the guide housing, is displaceable. 9. Embroidery machine according to one of claims 6 or 7, characterized in that on the carriage (71) on the thread cutting and clamping elements (55) is pivoted about a horizontally lying axis rocker (87) with which the connection of the rocker (87) can be produced or released with the drive profile (49). 10. embroidery machine according to claim 9, characterized in that the lower as a web (95) formed end (101) of the rocker (87) by a leg spring (97) can be pressed onto the lower end of the carriage (71). 11. Embroidery machine according to one of claims 9 or 10, characterized in that the lower end (101) of the carriage (71) is cranked in a hook shape. 12. Embroidery machine according to one of claims 7 to 11, characterized in that a clamping plate (59) is attached to the guide housing (65), which runs essentially parallel to the upper region of the slide plate (57) and that between the upper end regions of the slide plate ( 57) and the clamping plate (59) the upper ends of the cutting knife (61) and the catch hook (63) are arranged. 13. Embroidery machine according to claim 12, characterized in that the upper edge of each cutting knife (61) is hook-shaped and its cutting edge lies on the lower edge of the hook section and that the upper end of the slide plate (57) against which the cutting knife (61) rests , is designed as a cutting edge (61 '). 14. Embroidery machine according to one of claims 12 or 13, characterized in that the clamping plate (59) rests resiliently on the catch hook (63). 15. Embroidery machine according to one of claims 10 to 14, characterized in that the slide (71) on the slide plate (57) on the web (95) on the rocker (87) by the drive profile (49) abutting the web (95) is displaceable at the top and that the cutting knife (61) and the catch hook (63) can be pushed beyond the ends of the slide plate (57) and the clamping plate (59), so that the hook-shaped ends of the cutting knife (61) and the catch hook (63 ) exposed. 16. Embroidery machine according to claim 15, characterized in that the carriage (71) can be displaced upwards against the force of a spring (85) and can be displaced downwards by the force of the spring (85) for cutting and clamping the needle thread. 17. Embroidery machine according to claim 15 or 16, characterized in that when the rocker (87) is pivoted, the drive profile (49) is out of engagement with the web (95) on the rocker (87) and with the slide (71) and the cutting knife ( 61) and the catch hook (63) are hidden between the ends of the slide plate (57) and the clamping plate (59). 18. Embroidery machine according to one of claims 9 to 17, characterized in that drive means for the individual decommissioning of individual embroidery sites are arranged on the needle carriage (5). 19. Embroidery machine according to claim 18, characterized in that on the needle carriage (5) drive elements for individual pivoting of the rockers (87) on the thread cutting and clamping elements (55) are arranged and / or in that the linear drives (34) for drive elements the needles (13) are used. 20. Embroidery machine according to claim 1, characterized in that a cutting knife (61) and a catch hook (63) on the thread cutting and clamping element (55) by the force of a spring (85) for clamping and cutting the thread relatively displaceable from the cutting - And clamping position are arranged. CH 712 727 A1 CH 712 727 A1 ch ^c H? 1 ₂ ⁷ & A1 CH 712 727 A1 sfOS CH 712 727 A1 CH 712 727 A1 * <. C-î O / 73 ?. sc CH 712 727 A1 CH 712 727 A1 CH 712 727 A1 SEARCH REPORT FOR SWISS PATENT APPLICATION Registration number: CH00940 / 16 Classification of the application (IPC): Researched subject areas (IPC): D05C11 / 20_D05C, D05B RELATED DOCUMENTS: (Document reference, category, claims affected, details of the relevant parts (*)) 1 CH8837Q1 A5 (SAURER STICKSYSTEME AG) April 29, 1994 Category: X Claims: 1, 6, 20 * column 7, line 52 - column 8, line 25; Figures 2a - 3b * 2 EP2338413Â2 (LAESSER AG [CH]) June 22, 2011 Category: X Claims: 1, 6, 20 Category: Y Claims: 2, 3, 9.11 * [0015] - [0020]; [0038]; [0039]; [0042], [0043]; [0046]; Figures 4 - 11 * 3 JPS8053281U..U April 15, 1985 Category: A Claims: 1, 6, 7, 20 * pictures * 4 DE32G0230 A1 (SAURER AG ADOLPH [CH]) 10/28/1982 Category: Y Claims: 2, 3, 9, 11 * page 7, lines 3 - 7; Page 14, line 3 - page 15, line 14; Figures 2, 3 * CATEGORY OF THE DOCUMENTS CALLED: X: represent the novelty and / or the D: inventive step in question T: Y: in combination with a document of the same E: Category the inventive step in question A: define the general state of the art without particular relevance with regard to novelty and inventive L: activity &: O: non-written revelation P: were researched between the filing date of the The patent application and the claimed priority date were published by the applicant in the application, theories or principles underlying the invention on which the invention is based Patent documents whose application or priority date is before the filing date of the researched application, but which were only published after this date for other reasons Member of the same patent family, matching document