US2602473A - Jacquards for weaving looms - Google Patents

Description

July 8, 1952 o, DALLE 2,602,473

JACQUARDS FOR WEAVING LOOMS 3 Sheets-Sheet 1 Filed March 8, 1951 y 8, 1952 o. DALLE JACQUARDS FOR WEAVING LOOMS 5 Sheets-Sheet 2 Filed March 8, 1951 July 8, 1952 o. DALLE JACQUARDS FOR WEAVING LOOMS 3 Sheets-Sheet 3 Filed March 8, 1951 Patented July 8, 1952 UNITED STATES PATENT T OFFICE JACQUARDS ra time LooMs Olivier D'alle,

cit des Mecaniques Verdol, Lyon,

French limited liability company s, 1951, Serial No. 214,482

Application March In France I This invention relates to Jacquards for weavtently fed by means of pin wheels and it is passed ,on a perforated selector plate or table wherein it is felt "by feeler needles which control the hooks of the Jacquard. Owing to the thin character of the paper the band is liable to become torn when it is not quite free to move under the action of the pin wheels. This is particularly the case when the successive lengths of paper forming the band are defectively assembled with each other, or when the zones in which they are glued with each other are too rigid. The band then becomes wholly or in part jammed and the pin wheels tear the paper. It may also occur that a 'feeler needle does not clear the band in time and remains engaged through a, hole thereof.

Such accidents could of course be avoided by driving the hand through the mediumcf a clutch adapted to slip under such a reduced torque that when the band becomes jammed no tearing of the paper could occur. But in the known constructions this is quite impossible to obtain since the shaft carrying the pin wheels has also to actuate the spring pressed member which maintains the said shaft during the feeling operation to ensure the correct positioning of the band, and the torque required for operating this member is much higher than the limit which the paper could safely support.

A first object of my invention is to provide a Jacquard for weaving looms, of the Verdol type or. the like, wherein the driving torque imparted to the pin wheels adapted to feed the band is insufficient to damage the band if the latter becomes jammed for any reason, without the correct positioning of the band being impaired in normal operation.

Afurther object of my invention is to provide a Jacquard for weaving gear for the band is operated through the medi- .um of a torque limiting clutch, while the springpressed member adapted to ensure the correct positioning of the band is positively raised by a cam or the like carried by the continuously rotating driving shaft before each feed period of the band. It will be appreciated that with such an arrangement the spring pressed member is first raised while the pin wheels adapted to feed the band are still at rest, then the said wheels are driven through the torque limiting clutch without the latter having to operate the said mem- Sai nt-Cyr, France, assignorto So- France, a

March 8, 1950 8 Claims. (Cl. 139-4329) spondingto the angular-pitch of the pin wheels looms wherein the feed 7 ber,'and when the feed period is finished the spring-pressed member is again released whereby the band is accurately positioned. 'The torque limiting clutch may thus be so adjusted that the paper cannot be damaged, should the band become'jammed for any reason.

The torque limiting clutch is preferably in the form of a"notched wheel cooperating with springpresse'd levers adapted to engage the successive notches, the angular pitch of the notches correwhich ensure the feed of the paper band. With such an arrangement it will be appreciated that when the clutch slips, the paper band remains properly timed with respect to the perforated selector plate. v v

In the annexed drawings:

Fig. 1 is a partial elevation showing a. Jacquard of the Verdol type according to my invention. Fig. 2 is the corresponding endview.

Fig. 3 is a partial enlarged longitudinal sec tion taken along line'IIIIII of Fig. 2. 1

Figs. 4, 5 and 6 are transverse sections taken along lines lV-IV, V--V and VI-VI of Fig. 3.

Fig. 7 is a partial end view showing the stepby-step mechanism of the Jacquard at a position different from the position illustrated in Fig. 2.

The Jacquard illustrated is of the Verdol type comprising feed wheels I (Fig. 3) provided. with pins 2 adapted to engage the successive perforations of a pattern paper band such as P (Fig. 3). Wheels I are carried by a common shaft 3 supported by appropriate bearings such as 4.

On shaft tthere is keyed a ring 5 (Fig. 3) provided with a toothed portion 5a in meshing engagement with a worm screw 5- supported by a wheel 1 having trapezoidal teeth (Fig. 6). Wheel 1 is in'turn keyed on a sleeve 8 loose on shaft 3.

Sleeve 8 carries a plate 9 (Fig. 3) which is secured thereto-by rivets Ill and plate 9 supports two gudgeons H (Fig. 4) on which are pivoted two arcuate jaws l2 urged towards each other by a spring 13. As clearly shown in Fig. 4, gudgeons H are disposed in the vicinity of the periphery of plate 9 at a small distance from each other. Between jaws I2 there is disposed a wheel 14 provided with trapezoidal teeth similar to the teeth of wheel 1 of Fig. 6. Jaws l2 are besides to the Jacquard frame .24. formed. with another arm 39 :adaptedto beac- 'a plate 45 keyed on shaft 1.8.

on sleeve 8 and sleeve I5 is formed at its outer end with a gear wheel I6 adapted to cooperate with a step-by-step driving cam II keyed on the driving shaft I8 of the Jacquard, which driving cam is disposed at right angles to shaft 3 as in the conventional constructions.

Shaft 18rotatesata uniform.: speed, cam 11 being solformed as to impart to wheel .16 is. jerked or step-by-step movement. Fig. '7 diagrammatically illustrates the operation of this kind of mechanism which is besides well-known in Jacquards in general. understood that any other step-by-stepmechanism could also be used, such .as for instance .the conventional Maltese cross gear which is jgenerally employed in Jacquardsoperating with pattern cards made of oardboar A,

Shaft I8 also carries a cam I9 (Figs. '2 and3) It should moreover be adapted to actuate a roller (Fig. 1) supported at the end of a two-armed lever 2I22 pivntedat 23 (Fig. .2) on the Jacquard frame 2.4. The lever arm 22 of this lever acts on an' ad- =justable pusher screw .25 carried .at the outer end of a lever 26 pivotedat Z'I-on .an arm 28 fixed to the frame ,of the Jacquard.,(or to the auxiliary openable frame in thecase, of ,a Jacquard wherein the paper driving gear may be swung aside from the fixed frame proper). .Le-

ver carries a roller 29 (Figs- 1, 2 and 3) adapted to engagethe teeth of wheel I. Arelatively strong compression spring .39 which .rests against an abutment 31 (Figs. -1 and2) of the main frame (or auxiliary Qpenable frame) of the Jacquard urges lever 2.6 to 'maintain roller29 pressed against wheel I. Lever 2.l-.22 is .also loaded by a spring 22a adapted to maintain roller 29 against cam 1-9 (more particularly in the case .of a Jacquard with openable frame wherein lever 26 is swung aside with the paper driving mechanism).

.The 'rivets HI (Figs. 3 and 5) which secure plate 9 onto sleeve 3 "also secure to the said sleeve a wheel 32 provided with teeth with rounded-tips. This wheelcooperates with apawl 33 (Figs. '2 and 15) loose on apin 34 and urged by "a spring 35 against the said wheel 32. Pin 34 (Figs. 1 and 2) is carried by an :arm 35 in one with a sleeve 31 loose on a shaft 38 fixed Sleeve :3! is also tuated by the conventional string by means .of which the Jacquard may be .manually rotated backwards, and with a third arm 40 (Fig. "2) connected by a rod 4| with :a lever 42 .loose on 'a pin-'43 carriedby the 'Jacquard'fram'ei l. Lever '42 has a lateral lug 44 'whichimoves :above As shown :in :Fig. 3, plate-45 is formed with a notch .4511 ;on a portion of its periphery, and it is :so timed .onshaft I8 that 'notch'fia is below lug 44 when the .feeler needles havecleared the pattern paper P (m the perforated se'lectorplate or tableT'(F 'i'g. 3) Lever lfl is returned by a spring 45 (Fig. .2). The outer end 'of shaft 3 is screw-threaded -and:it receives'anut 3a (Fig. 3) by means of which sleeve 8 may be lo'cke'dagainst a shoulder '31) "of the :said shaft when proper angular timing has been obtained by means POT .screw 6.

- The operationis as follows:

"As "above indicated shaft I8 is continuously rotated "atJ-a uniform spe'ed'whilecam I1:- imparts a step-by-step ;-movement .to wheel-'16.

Wheel I6 drives sleeve i8 through the sspr'ing-eloaded gear or clutch 9I2I4 and sleeve 18in .1211111 =drivessshaft 3, on which litxislockedibyitheend --.of roller 29 begins just before wheel I6 is advanced by cam I7. In this manner the torque which wheel 5 has to transmit to shaft 3 through .thespring-pressed clutch 9I2-I4 is limited 'tothe torque necessary to rotate the saidshaft 3 ,inits, bearings and to advance the ,paper .band. Such a torque is of course very small "and therefore the spring I3 of clutch 9-I2-M may be extremely light. As soon as wheel .lfi'has completed its angular movement, cam l9 releases roller 20 whereby roller 29 is urged upwards by spring 30 intoengagement with Wheel .1, thus positioning .the latter accu- .rately. The paper band P .is therefore itself accurately positioned on the selector plate or table T. But the action of roller 29 cannot loadthe spring-pressed clutch 9-I2-I 4, since shaft 3 is at standstill when the said rollerengages wheel i; on the contrary the said shaft 3 would be positively stopped against the action of inertia forces, if this were necessary, thus preventing any slip of the said clutch.

It will thus be understood that spring I3 may freely be so adjusted that clutch -9--l2l4 will slip if the paper band becomes jammed in the paper advancing mechanism, or if a feeler needle is not raisedin due time from the selectortable. When this occurs, the Jacquard remains properly timed, since the number of teeth of wheel "I is equal to the number of teeth of wheel I4. 'The operator only has to turn the loom backwards until thepattern card on the selector table .corresponds to the next weft thread. The paper band itself is undamaged.

When the Jacquard has to be turned backwards, the operator actuates the string attached to lever 39. Pawl 33 is thus .reciprocated and it drives wheel 32 step by step. The saidwheel having the same number of teeth as wheel '1, the paper band is returned step by step. O'wing to plate 45 this operation can only be performed when the feeler needles have cleared the paper band since notch 45a only permits downward movement of lug 44 whenshaft I8 is at standstill .at the correct position. When such is not the case, lug 44 bears against the periphlectortable whereon it is 'felt by feeler needles, a

driving shaft adapted to rotate at a substantially uniform speed; an intermittent motion gearing embodying a driving member carried by said driving-shaft and a driven member adapted to. receive 'azstep-by-steprotary motion from said driving 'tmember," paper adva'ncin'g means embodying an intermittently rotating shaft;'-springpressed means to position saidintermittentlyrotating shaft "during each "feeling period of said paper band; 'a torque-limiting clutch to connect said'iintermittently *rotating shaft with said driven .:member, whereby .said intermittently 310- tating ish'aft ...is=.=;imparted a =step-byestep irotary motion; and releasing means actuated by said driving shaft to render said spring-pressed means inoperative during each period of movement of said intermittently rotating shaft.

2. In a Jacquard as claimed in claim 1, said spring-pressed means comprising a toothed wheel on said intermittently rotating shaft and an engaging member elastically urged against said toothed wheel; and said releasing means being adapted to disengage said engaging mem ber from said toothed wheel to permit free movement of said wheel.

3. In a Jacquard as claimed in claim 1, said torque-limiting clutch embodying a toothed wheel forming one element of the clutch; a plate co-axial to the said wheel and forming the second element of the clutch; members pivoted to said plate and adapted to engage the toothed periphery of said wheel and spring means to urge said members against said wheel; said wheel and said members being so formed that under the action of a torque exceeding a safe limit, said wheel may rotate, its teeth raising said members; and said wheel having a number of teeth equal to the number of successive impulses of said intermittently rotating shaft during a full revolution thereof.

4. In a, Jacquard as claimed in claim 1, said releasing means comprising a cam on said driving shaft, and means actuated by said cam and in turn acting on said spring-pressed means to render same inoperative during each period of movement of said intermittently rotating shaft.

5. In a Jacquard for weaving looms of the Verdol type operating with a perforated paper band advanced step by step on a perforated selector table whereon it is felt by feeler needles, feed wheels adapted to drive said paper band; an intermittently rotating shaft on which said feed wheels are keyed; a driving shaft adapted to rotate at a, substantially uniform speed; an intermittent motion gearing embodying a driving member carried by said driving shaft and a driven member loose on said intermittently rotating shaft, said driven member being adapted to receive a step-by-step rotary motion from said driving member; a torque-limiting clutch interposed between said driven member and said intermittently rotating shaft to impart same a step-by-step rotary motion to advance said paper band from one pattern card to the next one on said selector table; spring-pressed means to position said intermittently rotating shaft during each feeling period of said paper band; and releasing means actuated by said driving shaft to render said spring-pressed means inoperative during each period of movement of said intermittently rotating shaft.

6. In a Jacquard as claimed in claim 5, said spring-pressed means comprising a toothed wheel on said intermittently rotating shaft and an engaging member elastically urged against said toothed Wheel; and said releasing means being adapted to disengage said engaging member from said toothed wheel to permit free movement of said intermittently rotating shaft.

7. In a Jacquard as claimed in claim 5, said torque-limiting clutch embodying a toothed wheel loose on said intermittently rotating shaft and fast to the driven member of said intermittent motion gearing; a plate carried by said intermittently rotating shaft; members pivoted to said plate and adapted to engage the toothed periphery of said wheel; and spring means to urge said members against said wheel; said wheel and said members being so formed that under the action of a torque exceeding a safe limit, said wheel may rotate, its teeth raising said members; and said wheel having a number of teeth equalto the number of successive'impulses of said intermittently rotating shaft during a full revolution thereof.

8. In a Jacquard as claimed in claim 5, said releasing means comprising a, cam on said driving shaft, and means actuated bysaid cam and in turn acting on said spring-pressed means to render same inoperative during each period of movement of said intermittently rotating shaft.

OLIVIER DALLE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS

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