WO1983003852A1

WO1983003852A1 - A mechanism effecting play-free sinker movements in a shedding motion

Info

Publication number: WO1983003852A1
Application number: PCT/SE1983/000158
Authority: WO
Inventors: William Eger Nyboe Lauritsen
Original assignee: William Eger Nyboe Lauritsen
Priority date: 1982-04-22
Filing date: 1983-04-22
Publication date: 1983-11-10
Also published as: EP0093102A2; EP0093102A3

Abstract

A mechanism in a shedding motion, including a large number of preferably pneumatically or electromagnetically controlled selection members connectible with sinkers or the like. The novelty resides in the feature that the selection members are arranged on reciprocally mobile carrying means (1, 2) which are actuable by operating means (3, 5, 6, 9, 10; 4, 7, 8, 11, 12) imparting a preferably positive movement to the carrying means and being set so that relative motion between sinkers (29) and selection members (25, 26) will be eliminated at the selection moment.

Description

A MECHANISM EFFECTING PLAY-FREE SINKER MOVEMENTS IN

A SHEDDING MOTION

The present invention relates to a mechanism in a shedding motion, including a large number of preferably pneumatically or electromagnetically controlled selec¬ tion members connectible with sinkers or li,ke means. In conventional jacquard machines the 'so-called knives must carry out a certain upward movement before the sinker hooks (suspension hooks) engage with their respective knives and, inversely, the knives must carry out a longer^' downward movement than the upper and bottom shed positions of the sinkers to permit the knives to be unhooked from their respective sinkers.

These όverr-riding or idle movements between knives and sinker hooks or between sinker studs and suspension studs or latch studs cause momentaneous accelerations or retardations in the sinkers with adherent harness threads and heald. This results in jerks causing incon- venient oscillations and vibrations in sinkers and har¬ nesses.

The novel feature achieved by this invention is that the selection members are arranged on reciprocally mobile carrying means which are actuable by operating means imparting a preferably positive movement to the carrying means, and being set so that relative motion between sinkers and selection members will be elimina- ted at the selection moment.

The invention will be described more fully herein¬ after with reference to the^' accompanying drawings, in which:

Fig. 1 schematically shows an assembly according to the invention including sinker operating means or the like carried by mobile beams;

Figs. 2 and 3 are respectively a frontal and a sec¬ tional view showing examples of selection and hooking means fit for use in accordance with the invention; and Figs. 4, 5, 6 and 7 graphically illustrate the re¬ lative movements in connection with various movements of the selection mechanisms. 5 A number of pneumatically or electronically ope¬ rated guide and selection means 25 and 26 are mounted, in close and parallel relationship, on a pair of reci¬ procally movable beams 1 and 2, respectively. The beams- are adapted to be actuated by a pair of cam disc means

10 3, 4 which are connected to the beams 1 and 2 via run¬ ners 5,^' 6, 7 and 8 and lifting levers 9, 10, 11 and 12.

To eliminate the jerk strains in a jacquard machine or the like, which includes a number of pneumatically or electromagnetically controlled guide and selection

15 members 25, 26 for selection, hooking and release of sinkers in 'the .diametrically opposite turning positions of the latter, i.e. top and bottom shed position, a small reciprocal collective movement is given to the sinkers during those time intervals of a shedding cycle when the

20 sinker operating means or the locking mechanisms can stand still, i.e. in the top and bottom shed position, for instance through 75. of a revolution.

The selection members or selection bars 25, 26 are placed in parallel and close relationship and fixed on

25 the two reciprocally movable beams 1 and 2, as shown in Fig. 1. The beams 1 and 2 are given their preferably po¬ sitive movements by the cam disc system 3, 4 via the —-— runners 5, 6, 7 and 8 and the lifting levers 9, 10, 11 and 12. Instead of the sinkers 39 being carried along

30 with their curved sections and profiles, as shown in

Figs. 4 and 5,.^' in their turning positions, in movements relative to the studs 42 and 51 of the latch rockers 37 and 38, respectively, the turning bearings 56, 56.. of all the latch rockers 37, 38, in Figs. 2, 3, 4 and 5,

35 in the selection system 25 and 26 move collectively to¬ wards and away from each other, so that the studs 42, 51 of the latch rockers will be given the same movements relative to the curved sections and profiles of the sin¬ kers. However, the release and/or hooking of the sin¬ kers takes place while the sinkers stand still. The se¬ lection members according to Figs. 2 and 3 are of the type shown in Swedish Patent 396,098.

Fig. 4 is a movement pattern showing the movements of the sinker operating mechanisms indicated by full curve lines. Broken curve lines, drawn within these curves, show how the turning bearings 56, 56.. of the latch rockers 37, 38 move in relation to the movements of the sinker operating means. It is clearly shown here how the bearings 56, 56.. of the latch rockers move a small distance S and S.. , respectively, during the same period, corresponding to e.g. 75° of the revolution, as the sinker operating mechanisms and consequently the sinkers 39 'in Figs. 2 - 3 stand still in their diamet¬ rically opposite turning positions, i.e. in the top and bottom sheds.

Fig. 5 shows by full lines only the movements of the oscillation bearings.

Fig. 6 shows the reduced shed height h which can be obtained through a long period of rest in an open shed as compared to the much greater shed height H which would be necessary if the sinker operating means move according to a sine curve with the same ingoing and out¬ going times for the-weft introduction means, i.e. shutt¬ les, spears and the like.

Fig. 7 shows different movement courses shedding courses for four different sinkers illustrated by the symbols _

...'. X X X ?-. -. -. o o o o. From this it is clearly apparent how certain sin¬ kers stand quite still during several weaving cycles in top and bottom shed. This gives the following advantages:

1. that the sinkers need not carry out any over¬ riding movement, dead lift; the sinkers do not

O PI fe stop dead after a movement have started; hence considerably reduced vibrations in sinkers and harnesses; and 2. that hooking up of the sinkers on the hook studs 37₁ , 38₁ of the latch rockers takes place when the bearings 56, 56.. of the latch rockers, and consequently said latch rockers themselves, have taken their highest or lowest positions, while the speed between the latch studs 37. and 38-, , respectively, and the sinker studs 49 and 57,

^' respectively, is nihil or almost nihil, whereby the wear on latch studs, sinker studs and the bearings of the latch rockers is considerably reduced. Jerks between latch studs and sinker studs can be entirely eliminated.

OMPI

Claims

1. A mechanism in a shedding motion, including a large number of preferably pneumatically or electromag- netically controlled selection members connectible with sinkers or like means, c h a r a c t e r i z e d in that the selection members are arranged /on recipro¬ cally mobile carrying means (1 , 2) which are actuable by operating means (3, 5, 6, 9, 10; 4, 7, 8, 11, 12) imparting to the carrying means a preferably positive movement and being set so that relative motion between sinkers (29) and selection members (25, 26) will be eli¬ minated at the selection- moment.

2. A mechanism as claimed in claim 1, c h a - r a c t e r' i z.e d in that suspension or latch means or latch rockers (34, 38) pneumatically or electromagne- tically servo-operated on the selection members, includ¬ ing latch- or suspension studs (37.. , 38..), are carried along, via pairwise, collectively and reciprocally mo¬ bile bearing means (56, 56.. ) for said hook means, in such a motion relative to sinker hooks or studs that the velocity approches zero at the moment when the sin¬ kers (.29) are hooked for standing still in top or bottom shed.

3. A mechanism as claimed in claim 2, c h a ¬ r a c t e r i z e d in that the suspension or latch means (37, 38) are carried along _rvia their bearing means (56, 56i ) in collectively reciprocal movements relative to protruding or curved sections of sinkers standing still during the same time -interval and that the bearing means (56, 56₁) are attached or mounted on bars, frames or like means, common to said bearing means, constituting the carrying means (1, 2).