US857732A - Heddle for weaving-looms. - Google Patents

Description

PATENTBD JUNE 25, 1907. J. GROB. HEDDLE FOR WEAVING Looms.

APPLIOATION FILED SEPT. 2 7, 1906.

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M in essem PATENT OFFICE.

JULIUS GROB, OF HORGEN, SWITZERLAND.

HEDDLE FOR WEAVING-LOOIVIS.

Specification of Letters Patent.

Patented June 25, 1907.

Application filed September 27,1906. Serial No. 336A90.

To all whom it may concern.-

Be it known that I, J ULIUS GRoB, a citizen of;the Swiss Republic, residing at Horgen, canton Zurich, Switzerland, have invented certain new and useful Improvements in Heddles for Weaving-Loo1ns, of which the following is a specification.

The present invention relates to a flat heddle of metal,which when placed on the heddlebar is secured against rotation to too great an extent about its longitudinal axis. Heddles of flat metal strips compared with those of wire of circular cross-section have usually the advantage of occupying less space between the warp threads since they may be made proportionately very thin owing to their width Without becoming of less strength than said circular heddles. On the other hand heddles of circular or substantially circular cross-section have in comparison with flat heddles the advantage of yielding in any direction that is to say their flexibility is equal or nearly so in all directions while flat heddles are very flexible in the direction of the flat or wide surfaces but almost rigid in the direction of the narrow surfaces or edges. The latter fact has frequently caused great inconveniences during weaving with the flat heddles hitherto known.

For the purpose of permitting the heddles to move freely on the bars the end loops of said heddles are preferably made considerably wider than required for the passage of the bars from which the rotation of the heddles about their longitudinal axes results. If during weaving one or more lays are displaced in the direction of the warp threads, for instance rearwardly from the standing point of the operator or weaver, the friction of the warp threads produces a certain pressure against the thread eyes which results in a yielding of the heddles in the direction of such pressure viz. forwardly since the heddles are flexible in this direction. As before mentioned flat metal heddles being incapable of flexibility in this position since the wide or flat surface thereof should properly be parallel to the warp threads, the pressure exerted on the thread eye produces a rotation of the heddle about its' axis which rotation may become a complete quarter turn so that the heddles reach that position in which its flexibility in a forward or rearward direction is the greatest. The space between the separate warp threads is, as a rule, considerably smaller than the breadth of the flat metal cross position, compress and thus injure or frequently tear the warp threads.

My present invention consists in preventing such rotation of flat heddles at the same time allowing the end loops thereof to be made of suficient width to permit of the heddles freely moving on their bars. fected by bending the two shanks of each end loop to opposite sides of the plane of the heddle in such a manner that the corresponding bends of the upper end loop are in the opposite direction to those of the lower loop.

A form of construction of the improved heddle is illustrated by way of example in the accompanying drawing in which:

Figure 1 is an elevation showing the end loops of a heddle. Fig. 2 is a side view thereof with the bars in section. Figs. 3 and 4 are sections respectively on the lines AB and CD of Fig. l.

The heddle consists of a thin metal strip having at its ends the loops a and b and at the center a thread eye (not shown in the drawing). The loops a and b may be made of any shape or size but preferably such that they offer ample room for passage of the heddle bars 9 so that they are freely movable on the latter. The loop shanks are bent laterally out ofthe plane of the heddle in opposite directions to one another so that, for instance as regards the upper loop a (Figs. 1 and 3) the forward part c as seen from the position of the operator, is bent to the left side of the heddle and the rear part (i to the right, whereas the front part c of the lower loop I) is bent to the right and the rear part f to the left as shown in Figs. 1 and 4, that is to say the front shank of the lower loop is bent oppositely to the front shank of the upper loop, and the rear shank of the lower loop oppositely to the rear shank of the upper loop. By this arrangement I obtain a heddle with suitably wide end loops and therefore freely movable both in a lateral and vertical direction said heddle being prevented from twisting or rotating about its longitudinal axis in both directions. If with this form of construction the lay is moved in the direction of the warp threads, each heddle is given an impulse tending to twist or rotate the heddle about its longitudinal axis the point of application of this rotary force being in the thread eye and thus at or about midway between the two end loops. When heddles so that the latter when forced in said This is ef-- the pressure becomes such that the heddle tends to rotate in the direction of the arrow shown in Fig. 3 the loop shanks c and d of the improved heddle abut against the heddle bar g and prevent the rotation; and inversely if rotation tends to take place in the direction of the arrow shown in Fig. 4 the loop shanks e and f abut against the bar 9 in a similar manner.

Instead of bending the upper loop shanks (as in the drawing) in front to the left and at the rear to the right and the lower ones in front to the right and at the rear to the left,

also inversely the upper front shank may be bent to the right and the rear one to the left; the lower front shank being bent to the left and the rear one to the right, the only essential condition being that the corresponding bends of the upper loop are opposite to those of the lower loop in order to secure the heddle against rotation on both sides.

What I claim as my invention and desire to secure by Letters Patent of the United States is 2* l. A heddle for weaving looms comprising a flat metal strip having a loop adjacent each end, the shanks of each of said loops being bent out of the plane of the heddle in opposite directions to one another, the bent front portion of the loop at the upper end lying in a direction opposite to the front portion of the loop at the lower end and the rear portion of the loop at the lower end in a direction opposite to the rear portion of the loop at the upper end substantially as described.

2. A heddle for weaving looms comprising a flat metal strip having a loop adjacent each end the eyes of said loops being expanded and the shanks bent laterally out of the plane of the heddle in opposite directions the bent front portion of the loop at the upper end lying in a direction opposite to the front portion of the loop at the lower end and the rear portion of the loop at the lower end in a direction opposite to'the rear portion of the loop at the upper end substantially as de scribed.

In witness whereof I have signed this specification in the presence of two witnesses.

JULIUS GROB. Witnesses:

GEoRe RoTrI, A. LIEBERKNECHT.

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