US687555A - Picking mechanism for looms. - Google Patents

Description

No..687,555. Patented Nov. 26, I90l. J. .1. BROWN &. F. S. ARNTFIELD.

PIGKING MECHANISM FOR LOOMS.

(Application filad. Nov. 15, 1897.)

2 Sheets-Sheet l.

(No Model.)

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No. 687,555. Paten ted Nov. 26. 19m. .1. J. BROWN & F. S. ARNTFIELD PICKING MECHANISM FOR LOOMS.

(Application filed Nov. 15, 1897.) (No Model.) 2 Sheets Sheet '2.

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UNITED STATES PATENT OFFICE.

JOHN JASON R WN AND FREDERICK SAMUEL ARNTEIELD, OF PRESTON OANADA, ASSIGNORS TO THOMAS YATES, OF PRESTON, cANAnA.

PIOKING MECHANISM FOR LOOIVIS.

SrEcIEIcA TxoN formin art or Letters Patent No. 687,555, dated November 26, 1901. Application filed Malabar 15,1397. Serial No. 658.658. o man To an whom it may concern:-

Be it known that we, J OHN-J ASON BROWN and FREDERICK SAMUEL ARNTE1ELD,of Preston, in the county of Waterloo, in the Prov-' ince of Ontario, in the Dominion of Canada, have invented certain new and useful Improvements in Picking Mechanism for Looms, of which the following is a specification.

This invention relates to improvements in mechanism for the picking motion for weaving-looms; and the objects are to provide a picker mechanism whereby the full power of the picker-stick will be maintained from the initial movement and the speed thereof be gradually increased from the commencement throughout the stroke and to provide a relief mechanism for the sweep-arm whereby it will be disengaged from the action of the Shoe-shaft when any part of the picker mechanism has been stopped or impeded, and the motion of the shoe-shaft will be continued without imparting motion to the picker mechanism, th us obviating accident or breakage to the picker or shoe-shaft.

The novelty of our invention will be fully described and then particularly pointed out in the claims.

The invention is fully and clearly illustrated in the accompanying drawings, forming part of this specification, and wherein-- Figure 1 is a perspective view of a portion of the frame of a loom, showing our improvements applied thereto in operative association. Fig. 2 is a plan View, partly in transverse section, on a line centrally through the.

respective latches, and Showing picking-dog and sweep-arm locked by the latch which engages them, and showing in dotted lines the positions assumed by the respective latches when the picking-dog has been released from the Sweep-arm. Fig. 3 is a perspective View of the sweep-arm and relief mechanism for detachably locking the sweep-arm to the pickpicker-dog. Fig. 6 is a view in perspective of a modification of the construction shown in Fig. 4.

Referring to the drawings, A designates a portion of the frame of a loom, which may be of common and Well-known construction. B designates the shoe-shaft, mounted in bearings on the inner side of the frame A and to which a rocking motion is imparted by wellknown means. The Shoe-shaft B is shown in the drawings as rectangular in cross-sec picking-dog C is made inclined from the front to rear, as shown in the drawings, and on the inner side of this incline is formed a vertical flange F, parallel with the top of the pickerdog, which flange engages in a recess or groove in the sweep-arm, as indicated in the drawings, to hold the parts in alinement when in operative relation. On the inner face of the picking-dog is formed a lug K, having'an inclined face, which engages against a coincident inclined recess L in the sweep-arm and holds the inoperative relation, as shown in Fig. 2.

G designates the sweep-arm, consisting of a suitable arnrextending above the pickerdog, substantially as shown, and formed with a hub H, mounted loosely on the hub D of the picking-dog and held against lateral displacement by means of a collar L, secured by the set-screw M, which also secures the hub D. On the outer side of the sweep-arm G, being that side contiguous to the picking dog 0, is formed a depending lug or flange I, having a rabbet or groove J in its lower face, in which the flange F on the picker-dog engages and alines when the parts are in locked relation, as shown in Fig. 6 of the drawings.

By making the groove J and the flange F inclined, as indicated, it is apparent that the picker-dog may be released from its engagement whenever the parts are not held in locked relation. One side of the sweep-arm is formed with upper and lower flanges M and N, between which is seated the latch O. This latch O is formed on its inner side angular, as at 7, to adapt it to rest against the face of the sweep-arm, as indicated in Fig. 2, and the outer end of the latch being formed with a lip or catch P, which reaches over and engages both the sweeping-arm and picking-arm, as seen in the drawings. In the arm or shank of the latch is formed a slot or recess B, through which a retaining pin and bearing Q is arranged, and to provide the latch with means to automatically move it into engagement with the picking-dog and the sweep-arm a springs is looped around the pin Q and one arm thereof arranged to bear on the outer end of the latch and the other end of the spring carried in opposite direction and suitably lodged and secured by being bent to engage a rod T, which is depressed at its center and engages the flanges M and N at its ends, as best seen in Fig. 2 of the drawings. This spring S, as stated, holds the pickingdog and sweep-arm in alined operative position, but so that when the picker-stafi from any cause is impeded or stopped the pickerdog will be pulled out of engagement, after which the sweep-arm is free on its hub. The

'rear end of the latch Ois formed with a camnose X, which when the latch is in engaged or locked position stands against the inner face of a spring-actuated latch V to hold that member out of engagement; but when the latch O is disengaged this nose X is carried into a recess WV in the latch V, which engagement holds the latch 0 locked out of the pat-h of the picking-dog, as indicated in dotted lines in Fig. 2 of the drawings.

On the body of'the sweep-arm G are formed two bearing-lugs M N, between which'and a pivot-pin U is pivotally mounted the latch or arm V, formed with the recess W and having its outer free end portion bent or curved and adapted to lodge against and rest upon the edge of'the picker-dog. On the pivot-pin of the arm V is suitably anchored a spring W, the free end of which bears on the arm V, so that whenever the latch O is disengaged the force of the spring W presses down on the picking-dog and holds it from again engaging with the sweeparm. In the head of the sweep-arm G is fixed a pin Y, on which is mounted the end of the sweep-stick Z, the opposite end of the sweep-stick being provided with a metallic lug-strap A, which embraces the picker-stick B. The lower end of the picker-stick B is pivotally connected by a pivot pin or bolt 0 to the rocker-arm D. The rocker-arm D extends considerably beyond the bottom of the picker-stick B, and

in the extension of the rocker-arm D is formed an elongated slot E. Located in the slot E is a pivot-bolt F, provided with a set or look nut G to set and lock the pivot-bolt in any desired position in the slot E.

H designates a pitman, the lower end of which is pivotally mounted and held on the pivot-bolt F, the upper end of the pitman being pivotally connected and secured to a lug I, projecting from the outer end of the lugstrap A. The pitman H is composed of two sections a a, telescopically united, the part or section a being in the form of a sleeve, in which the part or section on slides. In the part or section a are formed elongated slots a, and in the section a are pins J, extending through the slots a and provided on their 'projectiug ends with nuts K, whereby the said parts of the pitman are held adjustably together in alined relation, the object being to make the pitman longitudinally adjustable, so that it can beadapted to any loom having a pick motion operated by a sweep stick and lug-strap.

By using the metallic lug-strap hereinbefore described and using the pitman the stirrupstrap formerly used can be dispensed with, as also can the canvas or leather lug-straps, which it was necessary to use in connection with the stirrup-strap. By providing the extension of the rocker-arm with an elongated slot and movably placing in the slot the lower pivot pin or bolt of the pitman the rapidity and power of the pick can be controlled and regulated-that is, by moving the pivot pin or bolt to the inner end or that end of the slot E contiguous to the shoe-shaft the power and speed of movement of the pick is de creased and by moving the pivot-bolt to the opposite or outer endof the slot the power andspeed'ofthe pickareincreased. Bymeans of the pitman the full power of the pick is obtained on the commencement of its stroke and the speed of the pick is increased from the commencement to the end of the stroke. To explain this motion more fully, we will assume that the pivot-bolt F is at the outer end of the slot E, as shown in the drawings. During the separation of the pick motion the pitman causes the downward movement of the lug-strap, as indicated by arrows in the drawings, bringing the lug-strap into closer proximity to the pivot-bolt of the picker-stick, gradually increasing the speed of the pickerstick from the commencement to the finish of its'stroke. On the return of the picker-stick the pitman-raises the lug-strap into its normal or starting position. By this means the full power of the picker-stickis obtained throughout the stroke without increasing the speed of the pick on the start and these parts are saved from all unnecessary wear. The use of the stirrup-strap necessitated the making of a series of screw or nail holes in the picker-stick, which consequently weakened the picker-stick and rendered it more liable to breakage or injury than would otherwise be the case. By dispensing with the use of the stirrup-strap the weakening of the pickerstick can be avoided. I

In the event of the stoppage of any part of the picking motion during the operation of the loom the stoppage would arrest the motion of the sweep-arm. The continued action of the shoe-shaft after the sweep-arm had been arrested would cause the picking-dog C to move in conjunction with the shoe-shaft and cause the cam K, carried by the shoeshaft, to engage thelipP and move outwardly the latch 0 against the force of the latchspring and cause thedisengagement of the picking-dog from the sweep-arm G. The tooth X of the latch 0 would engage the recess or step W of the arm V when the latch O has been moved into its outer position by the campiece K. The engagement of the tooth X with the recess W causes the trip dog or arm V to hold the latch O in its outer position until the return of the picking-dog to the sweep-arm. The return of the picking-dog to the sweeparm upsets the trip-dog and allows the latch to come into engagement with the cam K. If the obstruction to the movement of the pick still continues,the picking-dog will again separate itself from the sweep-arm in the manner just described; butif the obstruction has been removed the sweep-arm will move in conjunction with the shoe-shaft and pickingdog. By this means instantaneous relief is given to the sweep-arm in the case of an accident to the picking motion. Projecting from the lug M is a pin N, and projecting from the hub of the picking-dog O is a pin 0.-

Connected to the pins N O is a spring P, the purpose of the spring being to facilitate the reunion of the picking-dog and sweep-arm after a separation.

In Fig. 6 we have shown an alternative form of spring, which consists of a leaf 2, substantially S-shaped, provided with twolugs 2 through which passes the pivot-pin Q, one of the lugs 2 being above and the other lug 2 below the pivoted latch O. The hub of the trip-dogVis fitted with aset-screw 3, the head of which is adapted to bear against the adjacent end 2 of the spring 2. The opposite end 2 of the spring 2 presses against the back of the latch 0. By means of the set-screw 3 the pressure of the spring can be varied that is, increased or diminished-to meet the requirements of the relief motion. By using the leaf-spring and arranging it in the manner indicated in Fig. 6 one spring can be employed to operate the latch and the trip-dog and "its pressure can be varied to meet the requirements of the relief motion.

What We claim is 1. In a weaving-loom, the combination with the shoe-shaft, and a sweep-arm thereon, of a sweep-stick pivotally connected to the sweeparm and provided with a slotted lug-strap at its outer free end, a rocker'arm, a picker-stick pivotally supported on the rocker-arm and extending through the slot in the lug-strap, a slotted extension on said rocker-arm, and a pitman comprising longitudinally-adj ustable sections, one of which is pivotally secured to the end of the lug-strap and the other adj ustably connected to the slotted extension of the rear arm.

2. In a weaving-loom, the combination with the rocking shoe-shaft and the sweep-stick of the picker mechanism, of a picking dog mounted on the shoe-shaft and formed with an elongated hub, a sweep-arm having a hub loosely mounted on the hub of the pickingdog and formed with a flange having a groove to be engaged bythe end of the picking-dog, a latch mounted on the sweep-arm adapted to be engaged over the alined vertical edges of the sweep-arm and picking-dog and formed at its rear end with a cam nose or tooth, a spring to hold the latch in yielding engagement, an arm pivotally mounted on the sweeparm to engage with its free end against the edge of the picking-dog, and a spring to force the arm to hold the picking-dog'disengaged from the sweep-arm, substantially as and for the purpose specified.

3. In a weaving-loom, the combination with the shoe-shaft and the sweep-stick of the picker mechanism, of a picking-dog mounted on the shoe-shaft and formed with an elongated hub an inclined upper end and a cam piece on its inner side face, a sweep-arm, journaled on the hub of the picking-dog and formed with a lateral flange contiguous to the said dog having an inclined groove to be engaged by the inclined end of the pickingdog and a cam-recess to be engaged by the cam-piece of said dog, alatch pivotally mounted to engage over the alined vertical edges of the dog and arm and formed with a tooth at its rear end, a spring to hold the latch yieldingly in engagement, an arm pivotally mounted on the sweeparm and formed to bear against the edge of the picking-dog, and having a step or recess to engage the tooth of the latch, and a spring to operate the arm, substantially as and for the purpose specified.

Preston, October 23, A. D. 1897.

In presence of OTTO HOMUTH, HENRY 00120.

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