US2773515A - Verdol jacquards for weaving loom - Google Patents

Description

11, 1 5. DALLE 2,773,515

VERDOL JACQUARDS FOR WEAVING LOOM Filed NOV 12, 1953 2 Sheets-Sheet l INVENTOR IAIIORNE Dec. 11, 1956 o. DALLE VERDOL JACQUI XRDS FOR WEAVING LOOM 2 Sheets-Sheet 2 Filed Nov 12 1953 'rect operation of such J-acquards.

United States Patent VERDOL JACQUARDS FOR WEAVING LooM Olivier Dalle, St.-Cyr-au-Mont-dr, France, assignor to Societe a responsabilite limitee, Societe des Mecaniques Verdol, Lyon, France, a French limited liability com- P y Application November 12, 1953, Serial No. 391,601

Claims priority, application France November 28, 1952 7 Claims. (Cl. 139-59) This invention refers to J acquards for weaving looms of the Verdol type wherein the selection of the warp threads is ensured by means of a perforated paper band adapted to control feeler needles which in turn control pusher rods actuating driver needles associated to the hooks of the Jacquard.

With high speed looms it is very difiicult to obtain cor- The books and the weights give rise to inertia effects which cause slackening of the cords and faults in the selection.

It has been proposed to improve the operation of the Jacquard by means ofthe so-called double lift Verdol Jacquard wherein each warp thread is controlled by means of two elementary hooks integral with the same wire and which respectively correspond to two grid frames moving in opposed directions. With such an arrangement the vertical speed of the grids is reduced by one half since they cooperate alternately with the hooks. It is also known to dispose in such a Jacquard a fixed grid or open shed grid adapted to cooperate with catches provided on the wires of the hooks to retain a hook at the raised position whenever the corresponding warp thread is to remain raised during anumber of strokes of the loom.

The speed of these J acquards ishowever limited by the advance of the paper band by its driving cylinder and by the .selection of the feeler needles by the perforated paper. It is known that in the conventional Verdol Jacquard the driver needles associated with the hooks are actuated by pusher rods to which are attached the feeler needles selected by the paper band. The pusher rods are in turn actuated by a set of bars in the form of angle irons which are given a to and fro movement along an oblique path in such a manner that they rise when moving backwards and sink when moving forwards. During the backward needles attached thereto. The paper band is thus cleared and may be moved freely on the perforated feeling table 7 from one pattern to the next one. During the forward stroke the feeler needles are lowered on the paper band and they are selected by the latter. The rotation of the cylinder which advances the band must take place at the end'of the backward stroke and the selection of the feeler needles should be fully effected during the first part of the forward stroke, before the pusher rods are struck by the vertical flanges of the bars. The time available for these operations is therefore very short and with high speed looms it becomes insufficient and faults are liable to occur.

The present invention has for its object to increase the time available for the advance of the paper band and for the selection of the feeler needles in high speed J acquards of the Verdol type, and more particularly in double lift J acquards of this type.

In accordance with this invention the set of bars of the Jacquard is given a movement along a substantially rectangular path comprising a horizontal forward step in the lowered position, a vertical upward step or raising step,

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a horizontal backward step in the raised position and a vertical downward step or lowering step.

It will be appreciated that with such an arrangement the feeler needles are raised when the bars are at their advanced position and before the beginning of the backward step in such a manner that a relatively long time is available for rotation of the cylinder and advance of the paper band. Also the lowering ofthe bars with the feeler needles is effected before the forward step of the bars, whereby ample time is left for the selection of the feeler needles.

The set of bars is preferably actuated by means of two groups of cams carried by the driving shaft of the Jacquard, the first group being adapted to control the vertical movement of the bars and the second group the horizontal movement thereof. It is thus possible to adjust at will the relative duration of the four steps. I

In the annexed drawings:

Fig. 1 is a diagrammatical view illustrating the main parts of a double lift Verdol Jacquard.

Fig. 2 is a diagram showing the path of the set of bars in a Verdol Jacquard of conventional construction.

Figs. 3 to 6 are curves showing the movement during a cycle of the loom respectively of the two grid frames of the Jacquard, of the set of bars in the vertical and in the horizontal direction, and of the paper advancing cylinder in a Verdol Jacquard of conventional construction, the curves being disposed in vertical registration.

Fig. 7 is a diagram similar to the diagram of Fig. 2, but showing the path of the set of bars in a Verdol Jacquard according to this invention.

Figs. 8 to 10 illustrate curves similar to the curves of Figs. 4 to 6, but corresponding to the case of a Verdol Jacquard according to the invention, these curves being disposed in vertical registration with the curves of Figs. 3 to 6.

Fig. 11 is a side view of a Verdol Jacquard provided with a cam mechanism adapted for the carrying into practice of the invention.

' As illustrated in Fig. 1 a double lift Verdol Jacquard comprises two grid frames 1 and 2 which oscillate vertically in opposed directions. These grid frames cooperate with double hooks, each comprising two elementary hooks 3a, 3b formed at the ends of the same wire. To each double hook there is attached a cord 4 which actuates the eyelet or eyelets for the warp threads corresponding to the double hook under consideration. The hooks are selected by horizontal driver needles 5 actuated by the heads of pusher rods 6. To each pusher rod there is attached a vertical feeler needle 7 and all the feeler needles are selected by a perforated paper band 8 resting on a perforated table not shown. The paper band is advanced by pegged wheels 9 carried by a horizontal shaft 10, the unit formed by the pegged wheels and their supporting shaft being generally termed the cylinder, as the driving prism of the conventional Jacquard.

The pusher rods 6 are guided by a perforated plate 11 disposed in the vicinity of their heads, while their opposed ends rest on the horizontal flanges 12a of bars 12a-12b in the form of angle irons carried by an appropriate movable frame not illustrated. This frame is given a to and fro movement in the horizontal and in the vertical direction so as to lift the feeler needles 7 from the perforated paper, then to lower these needles on the next pattern of the paper and thereafter to actuate the pusher rods corresponding to the needles which have not been retained by the paper, i. e. those which have found a hole in the card.

It will be remarked that the cycle of operation of the cylinder and of the bars corresponds to the cycle of the loom and is therefore twice more rapid than the cycle of operation of the grid frames.

In the older Verdol Jacquards the drive of the frame which carries bars 12a, 12b was effected by suspending this frame to links which were given an oscillatory movement on one side onlyof the vertical position, whereby the frame was displaced along an arcuate path, the'lowermost position corresponding to the foremost position of the frame and the uppermost position to the rearmost position thereof. In more recentconstructions the frame enclosing the bars is actuated by horizontal rods having a horizontal reciprocating movement, the frame itself being guided by guides having an oblique downwardly extending portion followed by a horizontal portion. When the frame is moved forwardly by the rods it first sinks (path AB in Fig. 2) and then moves horizontally during the remainder of its stroke (path BC). During the rearward movement it first moves horizontally and then rises. The arrows of Fig. 2 illustrate the general operation.

The movement of the bars will now be examined with reference to the movement of the grid frames.

The vertical movement of the grid frames may be considered as almost sinusoidal and it may be represented by two sinusoids R1 and R2 (Fig. 3) having a phase difference of 180". During one cycle Z of operation of the cylinder and of the bars, i. e. during one cycle of the loom, since the frequency of the grid frames is one half of the frequency of the cylinder and bars, the movement of the grid frames will correspond to one half of a period. For the grid frame 1 this half period will correspond to the ascending step (curve R1) while for the grid frame 2 it will correspond to the descending step (curve R2). Curves R1 and R2 intersect at D. If the double hooks lowered by the descending grid frame 2 are to be correctly taken by the ascending grid frame 1 in accordance with the pattern. the driver needles must remain pushed by the pusher rods until point D. Consequently on the curve representing the horizontal movement of the bar carrying fname (Fig. 4) the backward movement will only begin at a point C2 which has almost the same abscissa as the point D (the small difference illustrated being provided for compensation of the play and of the inertia phenomena). This fixes the portion C2B2A2 of the curve which corresponds to the backward or return movement of the bars. This will also fix the rising movement of the feeler needles (Fig. 5) since, as indicated in Fig. 2, this rising movement takes place during the portion BA of the stroke of the bar carrying frame. i. e. during the time represented by the portion BzAz of the curve of Fig. 4. In Fig. 5 this rising move- Znent of the needles has been represented by the line When the feeler needles are raised, the paper band is take into account the phenomena due to the play and to the inertia of the moving parts. This rotation of the cylinder has been represented in Fig. 6 by the angle EFG.

The bars may only be again advanced when the cylinder has performed its rotation. This forward movement of the bars will begin at A1 (Fig. 4) somewhat after the end G of the rotational movement of the cylinder and somewhat before the end of the cycle Z (Fig. 3). In the example illustrated the point B1 corresponding to the end of the oblique portion of the movement of the bars is exactly situated at the end of the cycle Z while the point Cl. is at the beginning of the next cycle. This determines the line min (Fig. 5) representing the descending movement of the feeler needles.

It will readily be understood that under such conditions the time available for the rotation of the cylinder, the downward and the upward movement of the bars, and the actuation of the pusher rods is extremely short.

Of course in practice the various movements of the bar carrying frame, of the feeler needles and of the cylinder comprise accelerating and decelerating periods, which amounts to say that the representative cuwes should have no sharp angles, but more or less arcuate connecting portions between the successive straight portions. But this makes no change to the phenomena above examined.

In accordance with this invention the frame carrying the bars is given a movement such as illustrated in Fig. 7. Starting from the point H which corresponds to the uppermost and rearmost position, the frame first sinks vertically without moving forward (path HI), then it is advanced horizontally without being displaced vertically (path ll), then it is raised vertically while remaining at its advanced position (path JK) and finally it is returned backwards towards its starting point (path KH). Such a movement may easily be realized by means of two sets of cams adapted to effect respectively the vertical and the horizontal movements of the frame. Such a system of cams Will be hereafter described.

If this movement of the bars is examined in relation with the movement of the grid frames it will be observed that as in the case of a conventional Jacquard and for the same reasons, the backward movement of the bars may only begin at a point K (Fig. 8) situated immediately before the point D of Fig. 3. This point K has the same abscissa as the point C2 of Fig. 4. The backward movement of the bars (path KH of Fig. 7) is represented by the oblique line KH of Fig. 8. The bar frame thus reaches its rearmost position (position H of Fig. 7), but since it is already in its uppermost position, the paper band is quite free and may be advanced during the backward movement of the bars. .It may thus be assumed that when the bar frame reaches point H, the cylinder has already effected its rotational movement. It is thus possible to lower the feeler needles immediately when the bars reach the point H, this lowering of the feeler needles being effected by lowering the bars. In Fig. 9 which corresponds to the vertical movement of the bars, this descending movement of the bars is represented by the line hi. The 11 may be situated slightly before the point H, which means that in the rectangular representation of Fig. 7 the angle at H is somewhat rounded. The downward movement of the needles ensures their selection by the perforated paper band and ample time may be provided for this selection, such time being represented by the horizontal line HI of Fig. 8, during which time the bars remain in their rearmost position. When the selection of the feeler needles is effected, the frame carrying the bars may be advanced horizontally for actuating the pusher rods and the driver needles, which corresponds to the line I] of Fig. 8. Points I and I may have the same abscissae as the points A1C1 of Fig. 4. As soon as the bars reach the end of their forward stroke (point 1), they may be raised (line jk of Fig. 9). When the bars are in their uppermost position, the paper band is disengaged from the feeler needles and the cylinder may be rotated from one pattern to the next one (line EFG in Fig. 10).

It is easy to understand that the diagram of movement according to the present invention provides much more time than inthe known devices for the advance of the paper band, the selection of the feeler needles and the actuation of the driver needles. This may be ascertained by comparing the operative cycle in the conventional construction and as provided by the invention.

It has been explained that points C2 (Fig. 4) and K (Fig. 8) on the one hand, and points C1 and J on the other hand have the same abscissae which amounts to say that the time represented by C2Ci and K] is the same.

During this time C201 a conventional Jacquard performs the following operations:

(1) Release of the driver needles.

(2) Raising movement of the bars.

(3 Rotation of the cylinder (which in practice extends over 60 plus twice 15 for the sake of a safe operation before andafter these 60", making a total of '5 (4) Lowering movement of the bars. Actuation of the driver needles.

while in the improved Jacquard according to this invention (Figs. 3 and 8 to during the same time K] the operations effected are as follows:

(1) Release of the driver needles.

(2) Lowering movement of the bars.

(3) Actuation of the driver needles.

Three operations are therefore to be effected according to the invention in a time wherein five operations are to take place in a conventional Jacquard. More particularly rotation of the cylinder may easily be effected during the time kh during which the bars are in their uppermost position.

Experience shows that when a conventional Verdol Jacquard is operated at high speed (above 200 strokes per minute) the faults observed mainly result from the too rapid actuation of the bars which produces inertia phenomena interfering with the proper selection of the pusher rods and with the proper engagement of the hooks by the grids.

Referring to Figs. 4 and 5 is will be observed that in the conventional Verdol Jacquard the set of bars sinks during about one half the time represented by the line AiCi. Selection of the feeler needles and of the pusher rods associated therewith must be fully effected during this very short time, since at B1 the pusher rods begin to actuate the driver needles. On the contrary in a Verdol Jacquard according to the invention (Figs. 8 and 9) the downward movement of the bars extends during the time represented by hi and the selection may take place from h to I, while actuation of the driver needle is effected from I to I (which corresponds at least to twice the time B1C1, Fig. 4, available in a conventional Jacquard).

Fig. 11 illustrates a possible embodiment of a cam device adapted to ensure the movement of the bars as indicated in Fig. 7.

In this figure reference numeral 13 designates the frame of the Jacquard which carries the driving shaft 14 of the latter, such shaft being rotated at half the speed of the loom shaft. The Jacquard shaft 14 actuates the grid frames 101 and 102 (corresponding to grids 1 and 2 of Fig. 1) as hereafter described.

The shaft 14 carries in the vicinity of each of its ends and on each side of the frame two cams 15 and 16. Each cam 15 drives a roller 17 carried at the end of an arm 18 of a three-armed lever 18, 19, 20 pivoted at 21 on the frame 13. To the lever arm 19 there is attached a spring 22 which maintains roller 17 in engagement with cam 15. The arm 20 has at its end an opening 20a through which there is passed a gudgeon 23 carried by one arm 24 of a two- armed lever 24, 25 pivoted at 26 to the frame 13. The other arm 25 of this lever also carries a gudgeon 27.

Each cam 16 actuates a roller 28 carried by the end of a lever 29 pivoted at 30 on the frame 13. This lever 29 is connected by a horizontal rod 31 with a two-armed lever 32 pivoted at 33 on the frame 13. A spring 34 acts on this lever to maintain roller 28 in engagement with cam 16. The other end of lever 32 is connected with a relatively long horizontal rod 35 which supports at its other end the frame 36 in which the bars are disposed. The rod 35 is provided with an elongated opening 35a which is engaged by the above-described gudgeon 27.

It will be appreciated that cam 16 causes the horizontal movement of the bars through lever 29, rod 31, lever 32 and rod 35, while cam 15 causes the vertical movement through lever 18, 19, 20 and 24, 25. Of course both sides of the Jacquard are arranged in the same manner to ensure parallel movement of the bars. Cams 15 and 16 are symmetrical for ensuring two cycles of operation of the bars for each rotation of the Jacquard shaft 14, i. e., for each cycle of the grid frames.

In lieu of cams cooperating with spring-pressed rollers, there could be used desmodromic cams adapted to ensure positive movement of the corresponding rollers in both directions (grooved cams, for instance). For each cam 15 or 16 there could be substituted a pair of earns, the first one being adapted to ensure positive movement in one direction, and the second one in the reverse direction.

Cams 15 and 16 are so timed that they ensure the horizontal and vertical movements of the movable frame 36 and of the bars carriedthereby, as above explained with reference to Figs. 8, 9 and 10.

Shaft 14 besides carries two eccentrics (not shown) which drive connecting rods 103, each actuating on each side of the Jacquard a three- armed lever 104, 105, 106 pivoted at 107. Arms 104 and are in turn connected by rods 108, 109 with the grid frames 101 and 102 respectively. There is also provided each side of the Jacquard another three-armed lever 104, 105', 106', pivoted at 107, arms 104 and 105 being connected with the grid frames 101 and 102 by rods 108', 109', and arms 106' and 106 are connected together by a horizontal link 110. The arrangement is such that frames 101 and 102 are regularly oscillated vertically in opposition.

The advance of the paper band is ensured by a pinion 111 keyed on one end of shaft 14 and which meshes with a gear 112 carried by a laterally disposed longitudinal shaft 113. The latter supports a worm 114 which drives a pinion 115 on the above described shaft 10 (Fig. l) carrying the paper advancing pegged Wheels 9. Worm 114 has an irregular thread which provides in the known manner a step-by-step motion of pinion 115.

I claim:

1. The herein-described method for the actuation of the movable bars of a Verdol jacquard, which consists in imparting to said bars first, a downward vertical movement while they are at their rearmost position to ensure selection of-the feeler needles and of the pusher rods associated thereto; second, a horizontal forward movement to ensure actuation of the pusher rods and of the driver needles associated to the hooks of the jacquard; third, a vertical upward movement to raise the feeler needles from the pattern paper band of the jacquard; and fourth, a horizontal backward movement to release the driver needles.

2. In a method as claimed in claim 1, the step of rotating the cylinder adapted to advance the pattern paper band from a card to the next one while the bars are effecting their backward horizontal movement.

3. The herein-described method for the actuation of the movable bars of a Verdol jacquard of the two-shed type comprising two grid frames moving in opposition, which consists in imparting to said bars first a downward vertical movement while they are at their rearmost position and after the grid frames have crossed each other, to ensure selection of the feeler needles and of the pusher rods associated thereto; second, a horizontal forward movement to ensure actuation of the pusher rods and of the driver needles associated with the hooks of the jacquard while the grid frames are substantially at their uppermost and lowermost position respectively; third, a vertical upward movement to raise the feeler needles from the pattern paper band of the jacquard; and fourth, a horizontal backward movement to release the driver needles, such last-named movement only beginning substantially when the grid frames are crossing each other.

4. In a method as claimed in claim 3, the step of rotating the cylinder adapted to advance the pattern paper band from a card to the next one while the bars are effecting their backward horizontal movement.

5. In a Verdol jacquard a movable transverse frame supporting the bars of the jacquard; a pair of substantially horizontal rods disposed on each side of the jacquard frame in parallel relation, said rods being secured to said movable frame by one of their ends to support same; means to drive horizontally the other ends of said rods in unison; and means to drive vertically in unison the portion of said rods next to said movable frame.

6. In a Verdol jacquard having a transverse driving shaft a movable transverse frame supporting the bars of the jacquard; a pair of substantialy horizontal rods disposed on each side of the jacquard frame in parallel relation, said rods being secured to said movable frame by one of their ends to support same and said rods having a horizontally elongated opening in their portion next to said movable frame; a lever articulated to the free end of each of said rods to drive same in a substantially horizontal direction; a first pair of cams on said transverse driving shaft to actuate said levers; gudgeons slidably passed through said openings to support the next end of said rods; levers on which said gudgeons are fixed; and a second pair of eams on the transverse driving shaft of the jacquard to actuate said last-named levers and to move vertically the end of said rods next to said movable frame.

7. In a Verdoi jacquard having a transverse driving shaft, a movable transverse frame supporting the bars of the jacquard; a pair of substantially horizontal rods disposed on each side of the jacquard frame in parallel relation, said rods being secured to said movable frame by one of their ends to support same; a first set of levers pivoted on the jacquard frame todrive horizontally the other ends of said rods in unison; a secondset of levers pivoted on the jacquard frame to drive vertically in unison the portion of said rods next to said movable frame; and earns carried by said transverse driving shaft to actuate said first set and said second set of levers.

References Cited in the file of this patent UNITED STATES PATENTS 346,877 Verdol Aug. 3, 1886 FOREIGN PATENTS 991,705 France Oct. 9, 1951 1,039,530 France Oct. 7, 1953

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