FR2676073A1 - METHOD FOR SELECTING HOOKS OF A JACQUARD MECHANICAL AND HOOKS FOR SUCH A MECHANICAL. - Google Patents

Abstract

Method of selecting a hook in a Jacquard machine for a loom being made on the same height of the hooks (5), hooks for carrying out this method made up of a single branch with symmetrical double beaks, and Jacquard machine comprising such hooks .

Description

The looms of curly articles, carpets, etc., use

  mechanical Jacquard machines, according to the name of their inventor, with a view to producing two or more stages of crowds, between which the shuttles and spears (or yards) pass. These mechanics generally include a very large number of double-branch hooks which can be

  raised to different heights by means of

  blades. At the lower end of these hooks is collected a rope which, via or without hoists and boards, generally ends in a

  carabiner to which a harness wire is attached.

  The selection of a hook is generally made by means of needles which cross or not a cardboard or a roll of perforated paper These perforations correspond to a design reproduced in the fabric, thanks to the selection or not of a wire of the harness, depending on whether the hook is taken up or not by a blade, depending on whether a needle is

  does not pass or pass through a perforation in the cardboard.

  The selection is said to be positive when a perforation in the cardboard raises the hook or leaves it in the high position on the open step, or when a full in the cardboard lowers the hook or leaves it in the low position The selection is negative in the case reverse. The object of the present invention relates to a method for selecting hooks in a Jacquard mechanism. The aim of the process is to simplify the mechanical equipment, thus allowing a significant increase in its capacity while limiting the space necessary for

  its establishment on a loom.

  The method for selecting the hooks in a Jacquard machine according to the invention is characterized in that the selection of the hooks is made on the same point,

  i.e. on the same height of the hook.

  Another object of the present invention is a Jacquard mechanism provided with a device for carrying out the method according to the invention. This device of a Jacquard mechanism according to the invention is characterized in that it comprises hooks with a branch and double beaks, symmetrical by

hook report.

  Other characteristics and advantages of the method for selecting the hooks in a Jacquard mechanism and of the device used for this purpose according to the invention,

  will emerge from the description of various examples

  of application of such a method, illustrated by means of

attached figures.

  Figures 1, 2, 3 and 4 schematically represent various respective positions of the blades, hooks and needles used in the method of

selection according to the invention.

  FIG. 5 schematically represents two distinct positions of the hooks relative to the blades of the

  claws when they cross.

  Figures 6, 7 schematically represent the successive positions of the various elements ensuring the selection according to the invention in the case of selection at

  each crowd opening, pick by pick.

  Figure 8 is the typical representation of a

carpet tying.

  Figures 9, 10, 11, 12 schematically represent the successive positions of the elements ensuring the selection according to the invention in the case of a selection for four picks, for carrying out the binding of

carpet shown in figure 8.

  Figures 13, 14, 15 and 16 schematically represent successive positions of the elements ensuring the selection according to a variant of the method according to the invention with respect to that represented by the

Figures 9, 10, II and 12.

  FIG. 17 represents the two vertical projections of a hook according to the invention. Figure 18 shows a variant of a hook

according to the invention.

  Let us consider a Jacquard mechanism according to the invention, provided with hooks with single branch and with symmetrical double beak, shown diagrammatically in Figures 1,2,3,4 in

different positions.

  In FIG. 1, the blade (1), oriented towards the side of the cylinder is in the low position. If the needle (2) passes through a perforation (3) in the carton (4), there is no pressure on the hook (5), the blade (1) will drive the hook (1) through the spout (6), in its movement

  The selection is positive.

  In the case shown in Figure 2, in the same low position the blade (1), the needle (2) encountering a full of cardboard, press on the hook (5), and thereby releases the spout (6) the hook (5) which remains in position

  low The selection is also positive.

  In the cases, shown in Figures 3 and 4, we are in the following position of the claw blades, ie the blade (1) is in the high position, while the blade (7) oriented towards the side opposite the cylinder is

low position.

  In the case shown in Figure 3, the needle (2) passes through a perforation (3) in the carton (4) and does not press on the hook (5) Therefore the spout (6), in its part ( 6 '') symmetrical to the previous part (6 ') is released, and is therefore not taken up by the rise of the blade (7) The hook (5) remains in the low position The selection

is negative.

  By cons in the case shown in Figure 4, the needle (2) meets a full in the carton (4), presses on the hook, and the spout (6) is driven by the blade (7) in its movement of lifting It is a full of cardboard which causes the lifting of the hook and a perforation which keeps the hook position low The selection

is also negative.

  By this method according to the invention, one passes from a positive selection to a negative selection according to the orientation of the claw blade, if it is oriented towards the cylinder. On the contrary, if it moves away from the cylinder, the selection is performs at the same level

  needles when the blades are in the low position.

  This selection method according to the invention has the advantage that the pressure exerted by the needle (2) on the hook (5) is only necessary when the spout (6)

  of the hook (5) is taken or left by the blade (1), c a d.

  for a very short time in the cycle of the mechanics concerned On the other hand, when the blades cross (f ig 5) the hook (5) is hooked on one of the two blades (1) or (7) by the part (6 ') or (6' ') the corresponding spout (6) without any possibility of interference

(fig 5).

  To illustrate the selection mode according to the invention, we will describe three applications of use without these examples being able to limit the

scope of the invention.

  I In a first example, the selection is considered at each crowd opening, in the case of

pick by pick operation.

  Considering 4 hooks (fig 6) (8) (9) (10), (11) two hooks (8) and (9) are in the low position, two hooks (10) and (11) are in the high position Other part of the blade holder claws (12,13), one (12) is in position

  high, the other (13) in the low position.

  On the other hand by introducing into the mechanics concerned a grid (14) movable horizontally provided with blades (15) located on either side of the hooks

  located below the needles (8 ', 9', 10 '11').

  In the case of the situation represented in FIG. (6) this grid (14) is in the rear position, with respect to the cylinder, with the blades (15) being moved away by

compared to the box (16).

  The hooks (8), (9), (10) and (11) are provided in their upper part above the needles (8 ', 9', 10 ', 11') as well as in their lower part, below of these needles (8 ', 9', 10 '11'), of symmetrical double nozzles, respectively (8 '', 9 '', 10 '', 11 '') and

(8 '' ', 9 "' ', 10"' ', 11 "' ').

  In this way the selection of the hooks in the high position (10, 11) is done by the lower movable grid, called the open step, to make the crowd open. In the mechanical position shown in

  Figure 6, the selection is positive.

  For the hook (8) the needle (8 '), crossing the cardboard (16), do not press the hook (8) This is taken up by the blade mounted on the claw (13) in position

  low to the right of the front spout (8 '').

  On the other hand, the needle (9 ') meeting a full of cardboard (16), presses the hook (9), released from the blade concerned from the claw (13), remains in the low position resting on a blade mounted on a fixed grid (19) in

  below the lower movable grid (14).

  Similarly, the needle (10 '), passing through the cardboard (16), does not press the hook (10), but when the blade mounted on the claw (12) descends, the lower beak (10' ''), rests on the blade of the lower movable grid (14) of the open pitch The hook remains in

high position.

  Finally, the needle (11 '), meeting a full of cardboard (16) presses on the hook (11), releasing the lower beak (11 "' ') of the blade mounted on the lower movable grid (14) allowing the hook (11) to take the

low position.

  In the position of the mechanics shown in Figure 7, the selection becomes negative and the movable grid (14) takes the front position, therefore approaching the

blades relative to the cylinder.

  For the hook (8), the needle (8 ') passing through the cardboard (16), do not press the hook (8) The hook (8) being in the high position, and the lower spout (8 "' ') being free of blade mounted on the lower movable grid (14), which is in the front position, the hook descends with

the claw (13) in the low position.

  On the other hand, the hook (9) being in the low position is pressed by the needle (9 ') by a full of cardboard, the

  hook (9) rises with the claw (12).

  Similarly, the hook (10), in the high position, being pressed by the needle (10 ') by a full of cardboard, the hook remains in the high position when the claw (13) descends, being held in the high position, by the blade mounted on the lower grid (14), which is

forward position towards the carton.

  The needle (11 ') passing through a perforation of the cardboard (16), no longer presses the hook (11), which remains in the low position, the upper beak (11 "') being released from the blade mounted on the claw (12 ) in the low position when

it goes up.

  II In a second example, we consider a

selection for four picks.

  Or a binding of the carpet as shown

in Figure 8.

  The binding of the carpet gives us the successive positions of the bristles as shown in Table I.

Table I

  Drawing hair Built-in hair Built-in hair bottom top 1st pick bottom bottom top 2 nd pick top bottom bottom 3 rd pick bottom top top 4 th pick top bottom top Selection of hooks in mechanics

  used is shown in Figures 9,10,11 and 12.

  Figure 9 shows the position of four

  hooks (21,22,23,24) before the first pick.

  The mechanics include, in addition to the

  blades (25) and (26) respectively in the low position and in the high position, a lower movable grid (27) located below the needles (28), with horizontal reciprocating movement, called open step, acting on the hooks located at the front and intended for incorporating the top coat, a fixed grid (29) blade holder below the previous one, and a grid with bars, upper mobile

  (30) located above the needles (28) with movement of

  back and forth horizontal, and incorporating the bottom hair and being able to act on the hooks (23), (24) located at the rear of the machine with respect to the cardboard (31), and

a blade grid (51).

  The hooks (22) and (24) make the drawing, while the hooks (21) and (23) act on the incorporated ones, respectively in the high position and in the low position. The selection box (31) has fillings on the needles ( 22 ') and (24'), acting respectively on the hooks (22) and (24), while the bars of the upper grid (30) act on the rear hooks (23) and (24), called part for the incorporation of the bottom coat. Therefore, the hook (21) remains in the high position when the claw (26) descends, resting on the blade carried by the lower grid (27) The hook (22) descends with the claw (26), of needle pressure (22 ') The hook (23) remains in the low position, since it is pulled by the upper grid (30) which releases the beak (23' ') from the claw blade (25 ) when it rises, and the hook (24), also remains in

low position.

  In the figure (10) which represents the position of the mechanics before the second pick, the lower grid (27) is moved towards the carton (31) while the upper grid (30) has also moved towards the carton (31 ), and no longer press the rear hooks (23)

and (24).

  The hook (21) descends with the claw (25), and

  takes the low position, the selection is negative.

  On the contrary, the hook (22) assumes the high position, the upper spout (22 ') being driven by the claw (26) blade holder -, the hook (22) being pressed by

  the needle (22 '), the selection is also negative.

  The hook (23) remains in the low position, the lower spout (23 "'') resting on the blade of the fixed grid

(29).

  The hook (24) undergoing the pressure of the needle (24 ') rises with the claw (26) driving the

upper spout (24 '').

  The figure (11) represents the position of the mechanics before the third pick The cylinder supporting the cardboard (31) does not press on the needles which therefore do not press the hooks (21,22,23, 24) Similarly,

  the lower movable grid (27) is spaced from the hooks.

  Therefore, the hook (21) is driven in the high position by the claw (25) acting on the spout

(21 "') of the hook (21).

  The hook (22), from the high position, no longer supported, descends with the blade of the claw (26) and

takes the low position.

  The hook (23) driven by the claw (25) takes

the high position.

  The hook (24) descends to the low position with

the claw (26).

  Figure (12) shows the position of the

  mechanical before the fourth pick.

  Between the third and the fourth pick takes place

the change of the box.

  The lower movable grid (27) moves away from the

  cylinder and returns to its support position.

  The hook (21) remains in the high position when the claw (25) descends while resting by its lower spout

  (21 "'') on the lower movable grid (27).

  The hook (22), pressed by the needle (22 ') takes the high position by driving its beak

  upper (22 '') by the claw (26).

  The hook (23) descends to the low position, resting by its lower spout (23 "'') on the fixed grid

lower (29).

  The hook (24), pressed by the needle (24 ') takes the high position, by driving its upper spout (24' ') by the claw (26) We thus produced the drawing explained in Table I. III In a third example of the selection method according to the invention, the possibility of varying the application of the method is illustrated by varying

  the use of auxiliary grids.

  Thus for a selection for four picks, shown in Figures 13,14,15, and 16, the hooks (32) and (34) make the drawing while the hooks (33) and (35) relate respectively to the wire incorporated at the top and the wire incorporated at the bottom The lower grid (36), directly below the needle, which was movable in the previous example, can be made fixed. In the position shown in Figure 13, which corresponds to the position of the mechanics before the first pick, the hook (32) is pressed by the needle (32 ') and

  descends with the upper claw (37) in the low position.

  The hook (33) not pressed, by the needle (33 ') remains in the high position, resting on the fixed grid

(36).

  The hook (34), while being pressed by the needle (34 ') is subjected to a back pressure by an upper movable grid (39), located just above the needles. Therefore, the hook (35), in the low position before picking, is not driven by the lower claw (38) and remains in the low position while resting on the grid

fixed lower (40).

  Similarly, in the position represented in FIG. 14, of the mechanics before the second pick, the cardboard having perforations opposite to those of the previous position, the hook (32), not pressed by the needle (32 ') goes up with the claw (37),

  low position to high position.

  The hook (33), pressed by the needle (33 '), descends from the high position to the low position with the

claw (38).

  The hook (34), not pressed by the needle (34 ') from the low position rises to the high position, driven

by the claw (37).

  The hook (35) pressed by the needle (35 '), is released from the claw (37), remains in the low position in

  resting on the fixed grid (40).

  In the position shown in Figure 15, before the third pick, while the cylinder exerts no pressure on the needles, all the hooks are subjected to pressure by a second movable grid

upper (49).

  The hook (32) from the high position descends with the claw (37) in the low position. The hook (33) from the low position goes up with

the claw (38) in the high position.

  The hook (34) from the high position descends with

the claw (37) in the low position.

  The hook (35) from the low position goes up with

the claw (38) in the high position.

  In the position shown in Figure 16 before the fourth pick, the cylinder exerts no pressure on the needles, nor the second movable grid (49) on

the hooks.

  The hook (32) goes up with the claw (37) of the

  low position to high position.

  The hook (33) remains in the high position, when the claw (38) descends, by resting on the fixed grid

  (36) by the lower spout (33 "'').

  The hook (34) rises in the high position with the

claw (37).

  The hook (35) descends into the low position with the claw (38), the fixed grid acting only on the

  hooks (32) and (33) close to the cylinder.

  To make the selection according to the invention, the Jacquard mechanism is provided with at least one hook, characterized in that it only has one branch, this branch being provided with at least one double spout symmetrical with respect to the rod. of the hook Such a hook is

shown in Figure 17.

  It consists of a steel wire (41) of small diameter which in its lower part is bent in the form of an elongated loop, constituting a flat (42), to which is fixed a guide dish (43) slightly offset relative to the axis of the steel wire (41) This guide plate (43) is advantageously made of plastic, to which the rope (44) of the harness is hooked using the hook (45) obtained by overmolding in synthetic material on the rope (44) of the harness. In the upper part of the steel wire are fixed two double beaks (46) and (47) symmetrical with respect to the axis of the wire, each part of a double beak comprising a notch allowing the hooking or not of the hook considered by a blade belonging either to a mechanical claw, or to one or the other auxiliary grid. In a variant of the hook according to the invention, as shown in Figure 18, the guide plate (43) allows the mounting of a grooved caster (46) over which passes the rope (44) of the harness , one end of which (47) is then fixed to the mechanics, while the other serves as an attachment to the beam of the loom In this way, a simple lifting of the hook beak ensures a double lifting of

the smooth.

  On the other hand, the mechanics can be provided with guide rollers (50), on which the loops forming a flat (42) come to bear during the movement from bottom to top, and vice versa, of the hook.

concerned.

Claims (15)

  1 Method for selecting a hook in a Jacquard machine for a loom, characterized in that the selection of the hooks (5) is made on the same height of the hooks (5).   2 Method for selecting a hook in a Jacquard machine according to claim 1 characterized in that a needle (2) which passes through a perforation (3) of the cardboard (4) or meets a full of cardboard (4) can give rise to both positive selection and   negative of the hook (5) on which the needle (2) acts.   3 Hook (5) of a Jacquard machine for a weaving loom characterized in that it comprises a single branch provided with at least one symmetrical double beak (6)   (6 ') and (6 ") relative to the hook rod (5).   4 hook (5) of a Jacquard machine according to claim 3 characterized in that it is constituted by a steel wire (41) bent in its lower part in the form of an elongated loop, constituting a dish (42) while it comprises in its upper part at least one double beak (46,47) symmetrical   relative to the axis of the steel wire (41).   Hook (5) of a Jacquard mechanism according to one of the   claims 2 or 3 characterized in that it comprises   below the plate (42) formed by the loop of the steel wire (41) a slightly offset guide plate (43)   relative to the axis of the steel wire (41).   6 hook (5) according to claim (5) characterized in that the guide plate (43) is practical.   7 hook (5) according to one of claims 3,4,5 or 6   characterized in that it comprises a notch.   8 hook (5) according to one of claims 3,4,5,6 or   7 characterized in that a grooved caster (46) is   mounted on the guide plate (43).   9 Jacquard machine for weaving loom characterized in that it includes hooks (5) according to one of claims 3,4,5,6,7 or 8.   10 Jacquard mechanism according to claim 9 characterized in that it is capable of guide rollers (50) on which the dishes (42) hooks (5).   11 Jacquard machine according to one of claims 9 or   10 characterized in that the blade-holder claws (12, 13) respectively comprise blades (7) oriented from top to bottom while moving away from the carton (4) and blades (6) oriented from top to bottom while approaching cardboard (4), each hook (5) being located between a blade (7) of the grid (12) and a blade (6) of the grid (13).   12 Jacquard machine according to one of claims 9,10   or 11 characterized in that it further comprises a movable grid (14) located below the needles (8 ', 9', 101.11 '), driven in a horizontal movement back and forth, and provided with blades (15) able to support the symmetrical double spouts (8 "', 9"', 10 "', 11"')   lower which are provided with the hooks (8,9,10,11).   13 Jacquard machine according to claim 12 characterized in that it comprises a fixed grid (19) located below the lower movable grid (14) and also comprising blades which can be used   hook support (8 "', 9"', 10 "', 11"' t).   14 Jacquard machine according to one of the claims   9,10,11,12, or 13 further characterized in that it   comprises a grid (51) for setting blades.   Weaving machine including Jacquard machine   according to one of claims 9,10,11,12,13 or 14.