GB1583531A

GB1583531A - Selvedge jacquards

Info

Publication number: GB1583531A
Application number: GB80278A
Authority: GB
Original assignee: Maschinenfabrik Carl Zangs AG
Current assignee: Maschinenfabrik Carl Zangs AG
Priority date: 1977-01-12
Filing date: 1978-01-10
Publication date: 1981-01-28
Also published as: CH615707A5; FR2377464A1; DE2700986C2; FR2377464B1; DE2700986B1

Abstract

In order to simplify a machine for forming completely open sheds on weaving machines and to design it so that it can be used on dobbies and also for written-selvedge Jacquard looms, the sensing needles (10, 10'; 11, 11') are angled at the upper end to form auxiliary knives (17, 17') and are provided, in the region of the sinkers (1, 1'), with laterally projecting noses (16, 16'). If a sensing needle drops into a hole of the pattern card (9), it is not taken up by the auxiliary knife (17, 17'); if it sits on the pattern card (9), its upper angled part comes to rest in the path of movement (19 or 20) of the auxiliary knives. The sinkers can thus be controlled by means of the auxiliary knives (17, 17'). <IMAGE>

Description

(54) IM,PR,QVEMENTS IN OR RELATING; TO SELV E,DGE JACQUARDS (713 We, MASCHINENFABRIK CARL ZINGS AKTIENGESELLSCHAPT, a .Company organised and existing under the laws of the Federal Republic of West Germany, pf Oberdiessemer Strasse 15, 4l5Q K...refelQ West Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and' the method by which it is to be performed, to be particularly described in and by the following statement: - The invention relates to selvedge jac quards.

According to the invention, there is provided a selvedge jacquard comprising ss pattern mechanism rotatable either forwards or forwards and backwards in synchronism with an associated loom and comprising reading needles and hooks which co-operate with a pattern card located on a card cylin der, and lifting knives, the reading needles being angled at their upper ends in the direction of, and in the path of movement of, one or two auxiliary knives of the pattern mechanism, and the reading needles being provided in the region of the hooks with laterally projecting lugs engageable with the hooks whereby the auxiliary knife or knives can effect control of the hooks through the reading needles.

In one preferred embodiment of the invention, the reading needles are bent out wardly at right-angles at the top end to facilitate their lifting out by the 'auxiliary knives. When reading is completed, the reading needles will have dropped into the holes in the pattern card according to the pattern or will have contacted a blank on the pattern card so that they rest On the surface of the card; thus the reading needles are set, according to the pattern card, at one or other of two differend levels.The needles at the higher lever are located in the region of the low sheet position of the hooks and are engaged by the auxiliary knives which'lift the reading needles still further sO that the hooks which are in the low sheet position are lifted. For this pur- pose, the lugs on the reading needles are disposed immediately below the e hooks.

It is also possible to locate, at the upper end Qf the reading needles, a lifting rail which at the same time serves as a means for guiding the reading needles, its purpose being to maintain the reading pee les sus pende.d above the pattern card during advance ,of the latter. In order to improve the speed of readingin of the reading needles, these may also at the bottom end be guided in a perforated plate on which they are caused to rest by the action of thrust springs.

A selvedge jacquard embodying the invention and for forwards and reverse travel will now be particularly described, by way of example, with reference to the accom- pany diagrammatic drawings, in Which: Figure 1 is a diagrammatic representation of the selvedge jacquard; Figure 2 is a side view of a first reading needle of the jacquard, the needle being proyided with lugs disposed on its right- hand side; Figure 3 is a front view of the reading needle shown in Figure 2; Figure 4 is a side view of a second reading needle of the jacquard, the needle being provided with lugs disposed on its left-hand side; Figure 5 is a front view of the reading needle shown in Figure 4; Figures 6 to 10 show various positions of the jacquard during operation;; Figure 11 shows a portion of a pattern card; and Figures 12A to 12E are diagrams showing the movement cycle of yarious elements of the jacquard.

The selvedge jacquard now to be de scribe is intended for operation in synchronism with a loom during weaving and also during pick finding.

As shown in Figure 1, the jacquard com-, prises hooks 1 and 1' and a jack lever 2.

The jack leper 2 has a connecting cord 3 which passes around a roller 4 and interconnects the hooks 1 and 1'. The roller 4 is mounted by a bolt 24 on a lever 5 for a harness (not shown). The jack lever 2 transmits the movements of the hooks 1 and 1' via the lever 5 and the harness to warp threads to form the weaving shed (not shown) in accordance with the pattern read from pattern cards 9 in a manner to be described hereinafter.

The number of serially disposed hooks 1 and 1' is in accordance with German Standard DIN 64 805. The hooks 1 and 1' are guided in guide plates 6 and are supported when in a position corresponding to the low sheet of the shed on a bottom board 7. The jacquard is controlled from a pattern card 9 which lies on a card cylinder 8 which is rotatably mounted on a frame of the jacquard. According to the need for weaving or pick finding, the card cylinder 8 rotates in one direction or the other.

Reading needles 10 and 11 are guided below the bottom hook 1' in a perforated plate 12 mounted on the jacquard frame and are guided at their upper ends in a lifting rail 13. Thrust springs 14 extend between the perforated plate 12 and positioning rings 15 which are fixed to reading needles 10 and 11. The springs 14 urge the reading needles 10 and 11 towards the card cylinder 8 and thereby serve to shorten the reading times of the reading needles 10 and 11 into the pattern card 9. The reading needles 10 and 11 each carry two lugs 16 and 16' which are positioned according to the reading condition of the reading needles 10 and 11 into the pattern card 9, to engage or disengage the hooks 1 and 1' by means of auxiliary knives 17 or 17' with, or from, draw knives 18 and 18'.To enable the auxiliary knives 17 and 17' to lift the reading needles 10 and 11, the reading needles 10 and 11 are, at their upper end portions, bent over at right-angles in the direction of the auxiliary knives 17 and 17'. The reading needles shown in Figures 2 to 5 in two versions having lugs disposed on the right or left-hand side, 16 and 16', are necessary to enable the auxiliary knives 17 to lift out the reading needles 10 according to the pattern and the auxiliary knives 17' to lift out the reading needles 11 according to the pattern.

Since a reading needle 10 or 11 should in each case control only one hook 1 or 1', precautions are adopted to ensure this. In the position shown in the drawing in Figure 1, the reading needle 10 or 11 is capable of controlling only the hook 1 which is in the low sheet position, since the hook 1' which is in the high sheet position has, in the zone of the reading needles 10 and 11, a recess 23 so that it is impossible for the hook 1' in this position to be controlled by the reading needles 10 and 11; similar conditions apply when the position is reversed, i.e. when the hook 1 is in the high sheet position, and the hook 1' in the low sheet position.If both hooks 1 and 1' are in the low sheet position, then both hooks 1 and 1' could be operated; however, always one of the draw knives 18 and 18' is in the high sheet position at the time of operation of the reading needles 10 and 11, so that control of the reading needles 10 and 11 on the hooks 1 and 1' will take effect for only one hook.

During the advance of the pattern card 9 by the card cylinder 8, as Figure 1 shows, the auxiliary knives 17 and 17' will be moved once as indicated by the arrows 19 or 20 by a mechanism which is not shown. Movement of the auxiliary knives 17 and 17' is not confined to the directions indicated by the arrows 19, 20 since other directions are also possible. This is due to the fact that according to Figures 1 and 11, the hooks 1 and 1' or the reading needles 10 and 11 are each associated with two rows of the pattern card 9 so that after every selection the pattern card 9 must be advanced by the card sylinder through two rows of holes.

During weaving, the reading needles 10 and auxiliary knives 17 are operative, and during pick finding and weaving off, the reading needles 11 and auxiliary knives 17' are operative.

Figure 12 shows a time-distance diagram for all movement and control processes.

The direction of the arrow 21 indicates the time-distance diagram for the weaving process while the arrow 22 indicates pick findings: Figure 12A shows the cycle of movement for the draw knives 18 and 18' for hooks 1 and 1'.

Figure 1 2B shows the pattern of movement for the auxiliary knives 17 and reading needles 10 during weaving (direction of the arrow 21).

Figure 12C shows the pattern of movement for the auxiliary knives 17' and the reading needles 11 during pick finding (direction of the arrow 22).

Figure 12D shows the pattern of movement for the lifting rail 13 and the reading needles 10 and 11.

Figure 12E shows the pattern of movement for advance of the pattern card 9 by the card cylinder 8.

In accordance with Figures 6 to 10, and on a basis of Figure 12 and the section lines I-I to V-V indicated therein, it is intended now to describe the mode of action of the control parts.

Figures 6 and 12; section line I-I: The hook 1 moves into the low sheet position and the hook 1' moves into the high sheet position. The auxiliary knives 17 and 17' and the lifting rail 13 and card cylinder 8 are in their starting positions.

The reading needles 10 and 10' are still reading the pattern card 9 according to the pattern of the preceding weft, as are the reading needles 11 and 11'. At this time, the reading needles 10', 11 and 11' are spaced from the hooks 1 and 1' by a distance x.

Figures 7 and 12; section line Il-Il: The hooks 1 and 1' are in the end of the shed. The lifting rail 13 has lifted the reading needles 10, 10', 11 and 11' off the pattern card 9 by the distance x. The card cylinder 8 advances the pattern card 9 through one weft.

Figures 8 and 12; section line III-III: The hook 1 moves towards the low sheet position and the hook 1' moves toward the high sheet position. The lifting rail 13 moves into its starting position and thus the reading needles 10, 10', 11 and 11' are lowered onto, the read pattern 9.

The hook 1 is in the low sheet position and the hook 1' is in the high sheet position.

The auxiliary knife 17' which is provided for weft finding or for removing weft threads, is raised in the direction of the arrow. The reading needles 11 and 11' which, according to the pattern have dropped into holes in the pattern card 9 are not picked up by the auxiliary knife 17' and the hook 1 is not operated. If there were no holes in the relevant part of the pattern card 9, the reading needles 11, 11' would be resting on the surface of the pat tern card 9. The auxiliary knife 17' for weft finding would extract the reading needles 11, 11' and thus the hook 1 would be lifted by the lugs 16 on the reading needles 11, 11' from the lifting knife 18; the hooks 1 would thereby be left in the low sheet position.During weaving, how ever, as shown in Figure 12 (direction of the arrow 21), these functions are ineffec tive, since the control of the hooks 1 and 1' by the reading needles 11 over the in operative period T is completed.

Figures 10 and 12; section line V-V: The hook 1 is still in the low sheet posi tion, and the hook 1' is in the high sheet position. The auxiliary knife 17 which is provided for the weaving process is raised and withdraws the reading needles 10 which are resting on the surface of the pattern card 9. The reading needles 10 which are raised by the auxiliary knife 17 lift the hook 1 by the draw knife 18. The hook 1 remains in the low sheet position. During weaving, this function takes place accord ing to Figure 12 (direction of the arrow 21), since the control of the hook 1 or 1' by the reading needles 10 goes beyond the in operative time T.

The jacquard described above can be operated forward and backwards in synchronism with the loom also with only one row of reading needles 10, 10' if the control system is constructed accordingly, in known manner.

The described selvedge jacquard is advantageous due to its simple construction and ease of maintenance, and can be used either with dobby looms or jacquard looms, for example forming a name selvedge.

WHAT WE CLAIM IS: 1. A selvedge jacquard comprising a pattern mechanism rotatable either forwards or forwards and backwards in synchronism with an associated loom and comprising reading needles and hooks which co-operate with a pattern card located on a card cylinder, and lifting knives, the reading needles being angled at their upper ends in the direction of, and in the path of movement of, one or two auxiliary knives of the pattern mechanism, and the reading needles being provided in the region of the hooks with laterally projecting lugs engageable with the hooks whereby the axuiliary knife or knives can effect control of the hooks through the reading needles.

2. A jacquard according to Claim 1, in which a lifting rail is provided in the region of the upper ends of the reading needles and is operable to lift the reading needles off the pattern card by an amount sufficient to engage the lugs of the reading needles with the hooks which are to be operated, whereby to enable the card cylinder and the pattern card to be moved on to a position corresponding to the next weft to be woven.

3. A jacquard according to Claim 2, in which the lifting rail serves as a guide for the reading needles.

4. A jacquard according to any one of the preceding claims, in which each hook has a recessed portion which, when the hook is moved to a position corresponding to the high sheet position, is located in the region of the reading needles.

5. A jacquard according to any one of the preceding claims, comprising a perforated plate beneath the lower hooks and serving as a guide for the reading needles, the reading needles being urged towards the card cylinder under the action of thrust springs reacting against the perforated plate.

6. A selvedge jacquard substantially as hereinbefore described with reference to the accompanying drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. 17 and 17' and the lifting rail 13 and card cylinder 8 are in their starting positions. The reading needles 10 and 10' are still reading the pattern card 9 according to the pattern of the preceding weft, as are the reading needles 11 and 11'. At this time, the reading needles 10', 11 and 11' are spaced from the hooks 1 and 1' by a distance x. Figures 7 and 12; section line Il-Il: The hooks 1 and 1' are in the end of the shed. The lifting rail 13 has lifted the reading needles 10, 10', 11 and 11' off the pattern card 9 by the distance x. The card cylinder 8 advances the pattern card 9 through one weft. Figures 8 and 12; section line III-III: The hook 1 moves towards the low sheet position and the hook 1' moves toward the high sheet position. The lifting rail 13 moves into its starting position and thus the reading needles 10, 10', 11 and 11' are lowered onto, the read pattern 9. The hook 1 is in the low sheet position and the hook 1' is in the high sheet position. The auxiliary knife 17' which is provided for weft finding or for removing weft threads, is raised in the direction of the arrow. The reading needles 11 and 11' which, according to the pattern have dropped into holes in the pattern card 9 are not picked up by the auxiliary knife 17' and the hook 1 is not operated. If there were no holes in the relevant part of the pattern card 9, the reading needles 11, 11' would be resting on the surface of the pat tern card 9. The auxiliary knife 17' for weft finding would extract the reading needles 11, 11' and thus the hook 1 would be lifted by the lugs 16 on the reading needles 11, 11' from the lifting knife 18; the hooks 1 would thereby be left in the low sheet position.During weaving, how ever, as shown in Figure 12 (direction of the arrow 21), these functions are ineffec tive, since the control of the hooks 1 and 1' by the reading needles 11 over the in operative period T is completed. Figures 10 and 12; section line V-V: The hook 1 is still in the low sheet posi tion, and the hook 1' is in the high sheet position. The auxiliary knife 17 which is provided for the weaving process is raised and withdraws the reading needles 10 which are resting on the surface of the pattern card 9. The reading needles 10 which are raised by the auxiliary knife 17 lift the hook

1 by the draw knife 18. The hook 1 remains in the low sheet position. During weaving, this function takes place accord ing to Figure 12 (direction of the arrow 21), since the control of the hook 1 or 1' by the reading needles 10 goes beyond the in operative time T.