US2956589A - Mechanical dobby for weaving looms - Google Patents

Description

Oct. 18, 1960 G. PELLls 2,956,589

MECHANICAL DOBBY FOR WEAVING LOOMS @Wm/m7 ATTO RNEYS Oct. 18, 1960 Filed April 18, 1956 6 Sheets-Sheet 2 INVENTOR GIOVANNI PELLIS www ATTORNEYS Oct. 18, 1960 G. PELLls 2,956,589

MECHANICAL DOBBY FOR wEAvING Looms Filed April 18, 1956 6 Sheets-Sheet 3 INVENTOR GlOVA NNI PEL LIS www ATTORNEYS Oct. 18, 1960 G. PELLxs 2,956,589

MECHANICAL DOBBY FOR WEAVING LOOMS Filed April 18, 1956 6 Sheets-Sheet 4 uw; |IllllIlllllllllllllllllllllll INVENTOR GIOVANNI PELLIS www AT TORNEYS Oct. 18, 1960 G. PELLIS MECHANICAL BOBBY FOR wEAvING Looms 6 Sheets-Sheet 5 Filed April 18, 195e INVENTOR GIOVANNI PELLIS BY ATTORNEYS G. PELLLIS MECHANICAL DOBBY FOR WEAVING LOOMS Oct. 18, 1960 6 Sheets-Sheet 6 Filed April 18, 1956 Giovanni Pellis, 26 Via Pascoli, Goriziagltaly- Filed Apr. 18, 1956, Ser. No. 579,093

Claims priority, application I'tlyriiiie A1,5, ,195s

s claims. (ci. 139-747) Some dobbies for looms at present in use are mounted on the looms in awkward positions, not only in regard to the obstruction caused and the weight, butY also in regard to the diiculty of having 'access'to the different members utilised to connect the loom with the healds.

The dobby which will hereinafter be describediis provided With improved operating means and is more conveniently arranged on the loom without any increase" in the space occupied or in the height of the loom. Pulleys, cables, transmission shafts and'other means for connection of the dobby to the healds are eliminated, whereby there is obtained a better eliiciency and elimination of play and friction common to other known'constructions.

The improved dobby can be disposed inside' a loomof any type since the free space beneath the healds is always large and suffices for this purpose. This' arrangement ensures greater facility for examining and dismantling the different constituent parts of the dobby. The control ofthe clutch and de-clutching means for all the parts serving for the displacement of the blades-is entirely mechanical and is ensured by means of steel wires mounted in appropriate sheaths joined in the'form of a beam so as to terminate in a control casing orbox larranged at the exterior and carrying the punched cards. lAll the driving means in the frame of the-dobby and in the control casing or box are in a iiow of lubricating oil circulating under pressure by the action of a double action pump arranged at the interior of the frame.'

An embodiment of dobby in accordance with the invention is hereinafter particularly described with reference to the figures of the accompanying drawings, wherein: i

Fig. 1 shows a transverse Section of the dobby.

Fig. 2 shows a longitudinal section of the latter.

Figs. 3 and 4 show details of the operating means for the healds, Fig. 3 being a view taken in the'directi'on'Y (Fig. 2) after removal of the cover 31, While Fig. 4 is a similar view but where the lever is in the-working position. Fig. 5 shows a section of the control casing or box with the cylinders and drivingmembers forv the' cables which transmit the impulses to the clutch 'andde-clutching members of the sinkers. 5 'v H Figs. 6 and 6a together form an assembled view of the dobby and the driving casing or box-mounted' on the loom. f' Fig. 7a shows a vertical central section of the cylinder havingascroll groove 7a. Fig. 7b shows a corresponding elevation thereof.

Fig. 8a shows a front elevation, and Fig.v 8b a side elevation of an assembly of oscillating bar and racks.'

Fig. 9a shows an elevation, and Fig. 9b shows a section on the line A--A thereof, of an assembly Aof vtoothed sectors.

Fig. 10 is an elevation of an assembly wherein a rocker arm is coupled to cranks. i

Fig. lla is a side elevation, and Fig. 1lb vis an edge elevation, of a slide.'V

The position of the frame of the dobby is unalterable whereas ,that Q f the spatial @sins 95 120K Cia the States Patent Patented Oct. 18, 1960 2 two entities being connected at a distance by means of flexible cables. i

Referring to Fig. 2, -1 designates a disc cam mounted on one end of a cylinder on a shaft 37 connected yto a central drive shaft 36 by a chain 34 and "sprii'ckets,` as shown in Fig. 6, with a ratio of 1:1. A disc'cam .1 is mounted on each end of the cylinder, in the periphery'l of which is hollowed out a cam groove or scroll 7al which, by means of a cam follower 3 connected to 'a' toothed sector 2 imparts a rocking motion to the latterf .The motion includes two stationary periods. As can vbe seen from Figures 7a and 7b, cam groove 7a is made so s't'o have, at each half turn, a straight Vstretch extending over 65. Consequently, along such stretch of 65,o ,thefcin follower is not subject to any displacement.

The teeth of the sector 2 are engaged with the racks 4, carrying the bars 5, moving with a to and fr'o'mot'io'n in a vertical plane along the guiding means r6. Iii each of the groove elements in the two end faces of thec'ylinder is engaged a cam follower roller 8 carried ,b`y 'a' Ibell crank lever 9. The two levers Q are coupled to the two stop rods 10 (see Figures 1 and 2). The motion of the ysaid levers '9 coincides exactly with the period of 6 5 referred fto above, thatis to say when all the dobby members are stationary for a certain period of time. This happens precisely at each half lturn because the twocams ,7, as shown in Figure 7, have their respectiveI pivoted bers displaced by in relation to each other,4 and consequently the two stop rods 10 move4 alterna each half turn of the cylinder.A Thus, at eachi' of the cylinder cam 1, there are obtained two Stopp' g'es of movement in opposite'direetions of the toothed 'se or, during which the bell crank lever 9 executies a similarto and fro movement causing loweringandraisig'ofthe rods 10 the purpose of which vis to lock andfnlock ifespectively the pivoted members 11 which c` sci1lateik ,n the 12. .l n'. mi) .-ir Sinkers 13 are pivotably mounted in slides 14, as shown in the Figures l() and 11, and can assmefonlytwfo positions, namely a position of engagement; :th th ar 5 (see Figure Al0 and left hand side'of Figure'l), position of disengagement from the lbar 5 and4 of engagement with the pivoted member 11 see' right'hand Lde of Figure 1). .The slides 14 have notches A ,l engage the rollers Y1.6 carried bythe rocker arm 17; Fig. 1. On the axis of this rocker arm are Vpivtj'itally mounted the connecting rods 18 subjected to thef'actionlofthe blades or'cranks 19 at the opposite' ends oflwhich are secured the rods 20 connected `with`the heaids'Zlas shown at Fig. 6. The shaft about which the'cranks I19 rotate consists of two halves a and b held" together by the rings c. Such a construction permits 'an y return of the healds to the zero position as will be hereinafter described in greater detail. The control cables 23 disposed in s lheaths (Fig. 5) start from "the control casing or box where they' a're coupled to hooks 24 kept in engagement selectively'with one or otherr of two knives 25 by 'deflectors27 operating in accordance with the actuation ofthe 'needles/26. The knives 2.5 move simultaneously'in guiding slots 30 and they reciprocate vertically in relation'toeach other in' apredetermine'd manner during the 'workingperiod underthe action of a cam driven by the"`transmission shaft 37. The feeler `needles 26 are raised and lowered ina predetermined manner by the crank 25 atv each rotation of the vdriving shaft 3o and they are maintained in their upper or high position during the wholeof the time in which the cylinder 22 carrying the punched -cards advances them by onel step.' If, during the'foll descent, the 'feeler needles 26 come op" site ali e in flector 27 which is coupled to the hook 24 engaged with the uppermost knife 25, which thus has to carry it up and pull also the cable 23. At the same moment, the rod 10 (Fig. 1) is lowered by reason of the fact that it is actuated, as indicated, by the cranked lever 9, in Such a manner as to unlock the pivoted member 11 which, under the action of the cable 23, will be moved and will push back the hook of the sinker 13 beneath the bar 5. The latter, in its ultimate descent, will carry along the slide 14 as well as the rocker arm 17 towards the bottom. Through the intermediary of the connecting rods 18 and cranks 19, this produces lifting of the healds. In working position, the pivoted member 11 ensures the engagement or hooking of the slide 14 onto the bar and in its upward return stroke this latter brings back the slide 14 to its initial position. The to and fro movement continues so long as the sinker 13 remains hooked to the bar 5, that is to say so long as the feeler needle 26 has in front of it a hole in the punched card. When the feeler needle 26 (see Fig. 5) remains uplifted because there is no perforation in front of it, the deector 27 which is no longer displaced by the punch 29, brings back the hook 24 into engagement with the lower knife 25 which causes the hook 24 to descend and push back, during the said descent, the cable 23 and thereby also the pivoted member 11 (see Fig. l). This member, unlocked at this moment in relation to the bar 10, brings the sinker 13 to its position of rest and the healds remain stationary in their lower positions. When the healds have to remain stationary in their upper position, the two corresponding needles 26 will be lowered and produce successively the engagement of the sinkers 13 on the right and on the left; the right hand bar 5 4descends and carries along with it the slide 14 which causes the raising of the healds. On the other hand, the left hand bar rises and, having arrived at its upper position, the left hand sinker 13 becomes hooked on. At this moment, while the rocker arm 17 rises at the right hand side, it descends at the left hand side so eifecting an oscillatory movement keeping its axis stationary, the connecting rods 18 remaining in their vertical plane; in consequence the healds remain in their upper position until one of the feeler needles 26 remains raised because of the absence of any perforation in the punched card in front of it, the healds then again taking up their to and fro movement starting from the position at which they stopped.

There will now be described the adjustment or regulation of the healds. As will be seen in Figs. 1 and 3, the axis of the blades 19 comprises two bars a and b, secured by the ring c, and on the external periphery of which oscillate the blades proper (Fig. 1). The bars a and b are locked in their turn in the position indicated by the detents d and f which are capable of displacement in both directions along the two guides 35 of the frame. The racks carried by the detents d and f are engaged with the pinion i which itself meshes with the toothed sector l keyed on the shaft m. The arm n (Figs. 2 and 6) secured on the same shaft is coupled to a con- Inecting rod carrying a lever capable of being actuated by hand from the exterior of the frame. A safety device prevents any risk of effecting adjustment of the healds during operation of the loom.

The detents d and f have at their ends two inclined surfaces o and p along which can move the small rollers q and r. The cranks s and t pivot at u and are connected to the slides v by an arm, the other arm of each crank being pivoted at w to a rod (not shown) which connects these cranks together. Fig. 4 shows the bars a and b in the more widely separated position, seen also in Fig. 1. The detents d and f lock the bars a and b when the rollers q and r ride along and up the inclined surfaces of the detents of the slides, into the position of maximum separation. To adjust the healds, the bars a and b are brought together in such a manner as to eliminate the pivot about which the blades 19 turn.

This result is obtained by withdrawing the detents d and f by rotation of the toothed sector 1 and the pinion wheel by moving the arm in. The cranks s and t being connected with the detents d and f will then turn about u so raising the rod w. The latter, in rising, lifts the blades and the lower healds, the upper healds descending by their own weight until at half way they meet the rod w. At this moment, the bars a and b will be connected on all sides with the common axis in unlocking the ring e (see Fig. 1).

To return the healds to the original position, it is necessary to reverse the displacement of the arm n and to return the detents d and f to their working position. The inclined surfaces of the detents engaged between the rollers of the bars a and b which are thus moved apart, until they again lock the rings c; at the same time the rod w will be lowered and move the blades 19 apart.

I claim:

1. A loom dobby comprising a casing for disposal within the loom frame below the healds, two parallel horizontal spaced pivot shafts in said casing, a plurality of levers journalled on said shafts and arranged in pairs constituted by the adjacent levers on the two shafts, a plurality of healds, means coupling each pair of levers to a heald, pairs of spaced vertical guides in the casing positioned below each pair of levers, slide members in each guide, a plurality of rockers, corresponding in number to the healds, disposed in the casing and coupled to opposed slide members, means coupling each rocker by its centre to each lever of a pair, two spaced horizontal parallel drive bars vertically movable in the casing, means for driving said bars in out-of-phase reciprocation, and means for selectively coupling one and the other and both of the slide members to the associated vertically reciprocating drive bar, whereby when either of the slide members is coupled to its drive bar, the associated rocker is moved to lift the associated heald to a half-raised position, and when both the slide members are coupled to their drive bars, the associated rocker is moved to lift the associated heald to a fully raised position.

2. A loom dobby, as claimed in claim l, wherein the means for driving the bars in out-of-phase reciprocation comprise a rotatable drive shaft journalled in the casing, a cylinder secured on said shaft and having a scroll cam groove in its cylindrical surface, a toothed sector journalled in the casing, a cam follower on said sector engaged in the cam groove of the cylinder, the groove being so shaped as to reciprocate the sector angularly, and opposed vertically movable racks meshed with said sector and coupled to the drive bars.

3. A loom dobby, as claimed in claim l, wherein means for selectively coupling the slide members to the drive bars comprise catch means on the slide members operable to engage with the drive bars, control cables having an outer sheath coupled to the casing and to a control box and an inner longitudinally slidable wire coupled to the respective catch elements in the casing and to a control box and an inner longitudinally slidable wire coupled to the respective catch elements in the casing and to clutch elements in the control box, driven reciprocating slides in the control box, and punched card and feeler needle means in the control box serving to couple the clutch elements to the slides according to the pattern to be woven.

References Cited in the tile of this patent UNITED STATES PATENTS 2,674,272 Werner et al. Apr. 6, 1954 FOREIGN PATENTS 1,048,284 France Dec. 2l, 1953

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