US1511076A - Let-off means for looms - Google Patents

Description

A. J. HARRIS LET-OFF MEANS FOR LOOMS .Oct. 7, 1924.

Filed Dec. 29 1923 "WE/won,

WITNESS m n r M T. o a U N A Patented Oct. 7, 1924.

UNITED STATES ARTHUR J. HARRIS, 'OF PATERSON, NEW JERSEY.

LET-OFF MEANS FOR LOOMS.

Application filed December 29, 1923.

To all whom it may concern.

Be it known that I, ARTHUR J. HARRIS, a citizen of the United States, residing at Paterson, in the county of Passaic and State of New Jersey, have invented certain new and useful Improvements in Let-Off Means for Looms, of which the following is a specification.

The object of this invention is to provide a let-off mechanism for looms whereby an equable tension will at all times be maintained on the warp and the goods woven will be free of blemishes characterized by irregular spacing of the weft or filling and due in the. ordinary loom to the employment of slip-friction as a medium of resistance to the rotation of the warp-beam. Given an instrumentality to pull the warp forward and a rotary warp beam structure. together with a support on which said structure is journaled, the invention contemplates an actuated means in the support normally holding said structure against rotation under the pull of the warp but adapted to be moved to permit such rotation, an oscillating actuating means periodically engageable with the actuated means to cause such movement of the latter, the part of one of said means which is engaged by the other being shiftable into and out of position for such engagement, and means, normally maintaining a bend in the warp between said instrumentality and said structure and yieldable transversely of and with the warp when the latter tightens, for controlling the shifting of said part. It also contemplates, given such instrumentality, beam structure and support, means to control the rotation of said structure in the direction to pay out the warp including a tension-beam extending transversely of and maintaining a bend in and yieldable transversely of and with the warp, and means to preserve the firstnamed means during its movements with the axis of the tension-beam always substantially parallel to a given line.

In the accompanying drawing,

Fig. 1 is a side elevation of a loom embodying the present invention;

Fig. 2 is a plan view of the mechanism constituting the invention; and

Fig. 3 is a rear elevation of a part of what is shown in Fig. 1.

In the loom frame a is the breast beam Z) and a roller 0 over which the warp A ex- Serial No. 683,349.

tends, the same at B having incorporated. with it the filling or weft so as to form the fabric. There is a suitable take-up means, here represented by a sand-roller (Z (having a ratchet e and a pawl f to prevent the backward rotation thereof). It is a going part of the loom, as its crankshaft, and h is an eccentric thereon.

Rearward of the loom is. a pair of standards i which. form a fixed support in which are journaled the gudgeons of the beamstructure 70. These gudgeons are actually j ournaled in forwardly and downwardly inclined notches Z permitting the removal of the beam, as will appear.

The beam-structure includes as a fixed part thereof a worm-wheel m and with this worm-wheel meshes a worm n fixed to rotate with av horizontal shaft 0 (by a setscrew 79) extending at right angles to and arranged above the axis of the beam and journaled in a bearing 9 on one of the standards 2'. (The beam may be removed from its bearings by releasing the set-screw p and rotating the worm until it clears the worm-wheel and may be removed from shaft 0.) On shaft 0 is fixed a ratchet wheel r with which engages a pawl .s' pivoted in a lever t which is fulcrumed on the shaft 0. Parts n, 0, r, s and t constitute the aforesaid actuated means normally holding the beam structure against rotation under the pull of the warp and adapted to be moved, as by vibrating the lever t to cause the pawl to rotate the ratchet wheel and consequently the worm step by step, to permit such rotation. The lever is nor mally held depressed by gravity, tending to rest on a screw stud 25.

The oscillating actuating means periodically engageable with said actuated means to cause movement thereof here takes the form of afiat sliding bar or dagger a which is confined to a vertical plane of movement by a guide 1; on the side of the loom frame and at its forward end has a strap a; which embraces the eccentric h; the upper edge of said bar is at the rear end inclined to form a cam surface as shown in Fig. 1 and is adapted, while the bar is being oscillated by the eccentric, to wipe against the under side of lever t and thus vibrate the same. The bar or dagger is shiftable up and down into and out of position as it oscillates thus to wipe against or engage said lever t, being normally held down, or out of such position, by gravity.

The means for controlling the shifting of the bar or dagger is as follows: A tensionbeam 1 rests on the warp between the roller and the warp-beam and tends to maintain a bend in the warp, as shown. On the ends of its shaft 2 are fixed two pinions 2 which mesh with racks 3 on brackets 4E projecting rearwardly from the loom sides, so that in the vertical movements of the tension-beam its axis is always preserved parallel with a given line and (it being assumed that the beam is and roller 0 have their axes parallel with that of the tension-beam) the tensionbeam will thus preserve equal tension on all parts of the warp transversely thereof; (To prevent rubbing the warp, the tension-beam may be freely revoluble on the shaft .2 between collars z thereon.) The shaft is journaled at its ends in two slides .5 which have upper and lower pairs of rearward projections 5 inturned to embrace the racks 3 (see Fig. 2) and thus retain the pinions in engagement with the. latter, each slide having suspended therefrom a weight 6-and the near slide in Fig. 1 having an arm .5" (as shown in Fig. 2) on which is a grooved roller 5 to upwardly bear against the under side of the dagger a. c

When the loom is operating, shaft h being rotated, the dagger is oscillated. The beam structure normally tends to be held against rotation to pay out the warp by the actuated means n0-r-st which remains at rest (the lever resting on stud If) so long as the controlling means including the tension-beam is not elevated to an extent suiiicient to shift the actuating means a into position to engage the lever but whenever, the bend in the warp being taken up, this occurs, the actuating means actuates the actuated means and bring about the morement thereof necessary to permit the beam structure to rotate and thus pay out 11 re warp, Each time there occurs a momentary paying out of warp, corresponding to an increment of advance of the ratchet wheel, the controlling means ,inainitains the tension on the warp, so that at all times the tension remains constant.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is 1. In combination, an instrumentality to pull the warp forward, a rotary warp beam structure, a support on which said structure is journaled, an actuated means in the support normally holding said structure against rotation under the pull of the warp but adapted to be moved to permit such rotation, an oscillating actuating means movable periodically into engagement with the act-u ated means to cause such movement of the latter, one of said meansincluding a cam affording such engagement and the part of one of said means which is engaged by the other being shiftable into and out of position for such engagement, and means, normally maintaining abend in the warp be-' tween said instrumentality and said structure and yieldable transversely of and with the warp when the latter tightens, for. controlling the shifting of said part. I

In combination, an instrumentality to pull the warp forward, a rotary warp beam structure, a support on which said structure is jou-rnaled, actuated means in the support: normally/holding said structure against rotation i under the pull of the warp but adapted to be moved to permit such rota-- tion, an oscillatingactuating means movable periodically into engagement with the actuated means tovcause such movement of the latter, one of said means including a cam affording such engagement and the part of one of said means which is engaged by the other being shiftable into and out of and normally held out of position for such engagement, and means to shift said part into said position normally maintaining a bend in the warp between said instrumentality and said structure and yieldabletransversely of and with the warp into shifting engagement with. said part,

In testimony whereof I after my signature.

ARTHUR J. HARRIS.

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