FR2517338A1 - MECHANICAL JACQUARD WITH DOUBLE LIFT AND WITH OPEN STEP - Google Patents

Abstract

The invention relates to a double-lift open-shed jacquard machine having two oppositely movable and non-intersecting knife boxes (9, 10) arranged one above the other, sinkers (1) which are controlled according to the particular pattern by a needle mechanism and of which the main noses (12, 13) fastened at a distance one above the other on the same side interact with the knives (11) of the two knife boxes (9, 10), a guide grid (14) for the sinkers (1) which is arranged approximately in the middle between the knife boxes (9, 10), and retaining noses (15) which are fastened to the sinkers (1) and which interact respectively with a bottom-shed grid (7) and top-shed grid (8). In order to reduce the frictional resistances in the jacquard machine, it is proposed that the two knife boxes (9, 10) execute between their upper and lower dead centres, both during the upward and during the downward movement, a transverse movement in the direction of the main noses (12, 13), the stroke (a) of which corresponds approximately to the overlap width between the knives (11) and main noses (12, 13), and that the sinkers (1) in engagement with the knives (11) be bent slightly in interaction with the fixed guide grid (14) as a result of the transverse movement of the knife boxes (9, 10), so that a free space (b) is obtained between the main noses (12, 13) not in engagement and the knives (11) passing them.

Description

 "Jacquard mechanical double lift and open step".

The invention relates to a double Jacquard loom
open and raised step with two knife boxes su
stacked movable in opposite directions and do not cross
sant not, turntables ordered in accordance with one of
sin by a mechanism with needles and whose main spouts
blades fixed on the same side by being superimposed on a certain
spacing interact with the knives on both ends
with knives, a fixed guille guide arranged approx1>
matively in the center of the space between the neck boxes
teaux and provided for the plates as well as spouts
stop fixed to the plates and which co-operate with respecti
a low crowd grid and a crowd grid
high.

German patent N 23 44 363 has made known
be a Jacquard loom with double risers, and with open step,
in which in a first type of operation, the
one of the two knife boxes is moving
transverse and this respectively during its ace course
ascent, while the downward movement of the other knife box takes place along a straight line. In a second type of operation of this method
known Jacquard tier, the lower box with knives exe
cute a transverse movement during each movement-
ascending and descending in the intersection-zone
These provisions are provided in order to em
fish that the descending stages do not come in
caught, inadvertently, by their main beaks
not engaged with the knives associated with them,
from the rising knife box. The two types of land
which are possible in this Jacquard loom
known, have the disadvantage that the race
transverse movement of knife boxes must
be at least twice as large as the area of
superimposition between the main spouts of the plates and
knives, in order to obtain a free space which excludes an untimely attachment of the main nozzles, not in engagement, to the knives which pass in front of them. As a result of the traction of the harness, the plate bends back when it is hooked its main hook superior to the upper knife. Therefore only part of the transverse movement is transmitted to the lower main nozzle. This is why to obtain a correct work of the Jacquard loom, it is necessary to have a transverse displacement of a double or triple extent. When the knives do not execute any transverse displacement, as is necessary for example in the first type of operation for deforming the plates in cooperation with the fixed guide grid, sufficiently strongly for which upper main spout is pivoted on a path which corresponds to the sum of the width of superposition with the knife and the necessary free space. This leads to stresses and frictional forces which are so great that the force of normal withdrawal of the turntables is not sufficient to bring the latter back onto the low crowd or high crowd grids. In addition, the appearing friction forces cause a short time interval, significant wear in the mXt Jacquard itself and in the harness mounted in ara
In addition, the plates get tired due to the significant flexions, which can lead first of all to erroneous commands and then to ruptures by fatigue.

Finally, in this known Jacquard loom, the force required to move the plates is quite large.

In addition, according to the German patent application released for public inspection under N 25 30 799, a double lift Jacquard loom, with open pitch, in which the upper knife box performs a transverse movement during each movement ascending and descending, while the lower knife box always performs a rectilinear movement. In this job
Known jacquard, the travel of the transverse displacement of the upper knife box must also correspond to a multiple of the sum of the width of superposition of the main nozzles with the knives and the necessary free space. from the upper crowd to the lower crowd, must be bent against a fixed guide grid disposed between the two knife boxes, to such a point that the lower main beaks of the knives of the lower knife boxes moved in a rectilinear movement in the high crowd position, are released sufficiently. Consequently, in the case of this known Jacquard loom, we are faced with the same drawbacks as those already described above for the Jacquard loom according to German patent N 23 44 363.

 From these data, the invention aims to improve a Jacquard loom of the type described above so that the value of the travel of the transverse displacement of a knife box and simultaneously the bending of the plates on the fixed grid of guidance are reduced without having to accommodate other drawbacks for this.

To solve this problem, there is a double-lift, open-step Jacquard craft of the type described above, in which the two knife boxes run between their top and bottom dead centers, both during the upward movement and during the downward movement, a transverse movement towards the main beaks, the stroke of said movement corresponding approximately to the width of superposition between the main beaks and the knives, and that simultaneously the plates engaged with the knives and interacting with the fixed guide grid, are slightly bent under the effect of the transverse displacement of the boots with knives, so that there appears a free space between the main beaks not engaged and the knives passing in front of them
In the case of a double lift Jacquard loom, with open pitch, realizes according to this technical knowledge, the transverse displacement races for the knife boxes and the necessary bending of the plates against the fixed guide grid have been at least halved. compared to the state of the art. This is due to the fact that the excursion travel necessary to obtain a problem-free passage of the main nozzles not engaged has been divided approximately by half between the travel of the transverse movement for the cost boxes and the bending of the plates against the fixed grid. This idea of the invention naturally has for ccnsequenoe that one can give to the devices providing the transverse displacement of the knife boxes, dimensions considerably smaller than that was possible in the case of known Jacquard looms
Consequently, such a Jacquar loom can operate with a higher speed of rotation. In addition, it no longer appears in the Jacquard loom itself, significant friction resistance and the harness mounted downstream is provided
On the other c2aact: ç-risz t downstream ages of the present invention will emerge from the description given below taken with reference to the accompanying drawings showing a preferred embodiment of the invention, in which:
FIG. 1 represents a view in elevation of the face of a Jacquard loom comprising neck boxes located in the positions of top dead center and bottom dead center;
Figure 2 shows the same Jacquard loom in the closed crowd position;
Figure 3 shows the same Jacquard loom in which the knife boxes are located in the other neutral position; and
FIG. 4 represents a view in elevation of the teral of a plate in different positions of the function ticnne.ten-.

 In the Jacquard loom shown, the plates 1 are controlled in a known manner by a sample card 2 by means of a needle mechanism constituted by contact needles 3, head needles 4 and main needles 5, with a pressure rack 6 moved on a curve in the direction of the crossed double arrows. The upward and downward movement of the plates from a low crowd grid 7 to a high crowd grid 8 or vice versa is effected by means of knife boxes 9 and 10 arranged one above the other, displaceable in opposite directions and whose knives li interact with main spouts 12 and 13 mounted on the plates 1. A fixed guide grid 14 is disposed between the two knife boxes 9, 10. The plates 1 are stopped by means of a rear spout 15 on the low crowd or high crowd grids 7, 8.

 The plains l are made with E: uk brantes and have an elastic protruding appendage le so that a defined application is always guaranteed against the guide grid 14.

 In the operating position A shown in FIG. 4, the plate 1 is lifted by the knife 11 of the upper knife boot 10 in the high crowd position shown and is stopped by its blocking spout 15 on the high crowd grid. 8. In the operating position B, the plate is located on the path starting from the high crowd position, in the low crowd position, and this approximately in the middle closed crowd position, in which its main spout 12 passes precisely devan the costing box 9. Since, like the lower knife box 9, the upper knife box 10 performs in this zone a transverse displacement movement of stroke a, the plate 1 is attracted against the guide grid 14 -and bent while being moved apart in a zone situated below the knife box 9, so that a free space appears b. At the end; of the downward movement, the plate 1 is in the operating position D.

 In the operating position C shown in FIG. 4, the plate 1 is moved by the lower knife box 9 from the low crowd position to the high crowd position. In the vicinity of the closed crowd position, as a result of the transverse displacement of the lower knife box 9, a bending of the upper end of the plate 1, so that it appears again, between its upper beak 13 and the upper knife box 9, a free space b for collision-free passage.

 From the operating positions A to D shown in FIG. 4, it is visible that the transverse movement of the two knife boxes 9, IC bringing the latter into the closed crowd position is equal to only a few millimeters and that the free space required b for collision-free passage is obtained in addition by a slight bending of the plate 1 against the guide grid 14. A double lift Jacquard loom, with open pitch, having this technical control system, plate 1 is suitable for high rotational speeds.

Claims (1)

 CLAIM  Ilquier Jacquard with double lift and not open, comprising two knife boxes (9,10) superimposed, movable in opposite directions and not crossing, plates (1) controlled according to a design by a needle mechanism and whose main nozzles (12,13) fixed on the same side by being superimposed at a certain distance, interact with the knives (11) of the two knife boxes (9,10), a fixed guide grid (14) has approximately in the center of the space between the knife boxes (9,10), for the plates (1) as well as stop spouts (15) fixed on the latter and which interact with respectively a low crowd grid t7) and a high crowd grid (8), characterized in that the two knife boxes (9, 10) execute between their top and bottom dead centers, both in the case of upward displacement and of downward displacement, a transverse movement in the direction of the main nozzles (12,13), the course a of displacement corresponding to pproximally to the width of superposition between the knives (11) and the main nozzles (12,13), and that the plates (1) not in engagement with the knives (31 'and COagissanss with the fixed guide grid (14) are slightly curved by the transverse displacement of the knife boxes (9,10), so that there appears a free space b between the main nozzles (12,13) not engaged and the knives (11) passing in front of them.