US2407056A - Picking shoe - Google Patents

Description

Sept; 3, 1946 B. w. BROUWER,

PIcKIN SHOE Filed Junel5, 1945 FIG. 1.

/ I IN VEN TOR.

Patented Sept. 3, 1946 PIQKIN G SHOE Benjamin W. Brouwer, Auburn, Mass, assignor to Crompton & Knowles Loom Works, Worcester, Mass, a corporation of Massachusetts Application June 15, 1945, Serial No. 599,671

Claims.

This invention relates to improvements in picking an sms for looms and it is the general object of the invention to provide a picking shoe so constructed as to facilitate checking of the inward stroke of the picker stick and also assist the stick to return to its normal outward position.

In certain types of picking mechanism the bottom end of the picker stick is secured to a shoe which rests on a rocker iron mounted to swin with the lay. As heretofore made the shoe has been provided with an under surface curved throughout its length. As a result of this con struction the shoe rolls or rocks along the rocker iron throughout the picking stroke with no appreciable retarding effect on the stick at the inner end of the picking stroke.

It is an important object of my present invention to provide the shoe with an under surface part of which is curved and part of which is straight, and relate these two parts of the shoe surface of the shoe engages the rocker iron near the end of the picking stroke. As a result of this construction the greater part of the shoe is lifted away from the rocker iron near the end IE on which is rotatably mounted a picking roll or ball [6 for engagement with a cam I 1 secured to a picking shaft 18. The latter is mounted. for rocking movement in bearings secured to the loom frame II]. A sweep arm 19 extends upwardlyfrom shaft l8 and is attached to a sweep stick 2B, the outer end of which is connected to a picker stick 2|. During loom operation shaft 13 rotates every second pick of the loom and the roll I 6 engages the cam I! to move the picker stick to the left as viewed in Fig. 1 to pickshuttle S when the lay is about at top center on its backward stroke.

Secured to the rocker shaft I4 is a rocker iron having an upper flat surface 26 and provided with a vertical lengthwise slot 21. A lug 28, see

20 to the rocker iron in such a way that the straight of the working stroke of the stick and sets up increased strains in=-the return spring which tend to check the stick. These increased strains also hasten the outward or return movement of the stick to normal position.

With these and other objects in View which will appear as the description proceeds, my invention resides in the combination and arrangement of parts hereinafter described and set forth.

In the accompanyingdrawing, wherein a convenient embodiment of my invention is set forth, M

Fig. 1 is a front elevation of a part of the loom having my invention applied thereto, and showing the picker stick and shoe in th positions they occupy at the beginning of a picking or working stroke,

Fig. 2 is an enlarged horizontal section on line 2-2 of Fig. 1,

Fig. 3 is an enlarged front elevation, parts in section, of the shoe shown in Fig. 1 but with the Fig. 3, depends from the rocker iron and carries a stud 29 on which is rotatably mounted a spring drum 30 to which a strap 3! is secured. A torsion spring 32 surrounding the drum tends normally to turn the drum in a clockwise direction as viewed in Fig. 3 and resist movement of the strap 3| to the right or outwardly away from the loom frame.

A picking shoe 35 rests on the surface 26 and has a slot 36 through which projects a tongue 31 projecting upwardly from the rocker iron 25. The right end of the strap 3! is secured as at 38 to the lower outer part of the picker stick.

A bolt 40 passes through a cleat 4|, the picker stick, and the upright wall 42 of the shoe 35.

By means of the bolt and cleat the left edge of the picker stick as viewed in Fig. 3 is forced against an inverted .T-shaped guide 43 which extends along the inside of wall 42. The lower end of the guide 43 extends through the slot 2! and the bottom of the guide 43 is provided with shoe shown in that part of the picker stick stroke where the flat surface of the shoe engages the rocker iron,

Figs. 4 to 7 are diagrammatic views showing the manner in which the invention operates, and

Fig. 8 is a vertical section on line 8-8 of Fig. 3. Referring to Fig; 1, the loom frame l0, lay H,

lay sword i2, bottom shaft l3, and rocker shaft I 4 may all be of usual construction. The bottom shaft [3 has secured theretoa picking arm oppositely extending lugs 45 which can engage the side walls 46 of the shoe 25 forming the sides of slot 21. A roll 50 turns on a stud 5| extending between the walls 46 and the spring 32 and strap 3| act to hold the left edge of the guide 43 against the roll 50, see Fig. 3.

A second bolt 52 is threaded through the wall 42 and bears against the upper end of guide 43 and, together with the bolt 49, affords means for effecting slight angular adjustments of the picker stick with respect to the shoe. The matter thus far described except as noted hereinafter is of the usual construction and operates in the usual manner except for an upward movement of the picker stick accompanied by rolling of the guide 43 along the roll 50 at the end of the picking stroke, as will be pointed out hereinafter. 7

The under surface of the shoe 35 is made in the general form shown more particularly in Figs. 3 to 7. The outer part of this surface may be curved and convex with respect to the surface 26, but approximately at the point where this curve reaches the picker stick or guide 43 the curved surface 6!! ends, and merges with a straight flat surface 6|. The point of joining of these curved surfaces 60 and BI, designated at 62, will be located about as indicated in Fig. 3, that is, at or to the right of the guide 43 and to the right of a vertical line passed through roll 50. The straight surface 6| extends toward the loom along the left end of the surface 26, Fig. 3.

Under normal conditions preparatory to a picking operation the parts will be in the position shown in Figs. 1 and 4 with the picker stick in its outermost position and with the convex curved surface Bil in engagement with and tangent to the surface 26. Under these conditions all of the straight surface 6| will be above and out of contact with the top surface 26 of the rocker iron 25, being held in that position by the spring 32 and strap 3!. As the roll l6 engages the cam l! the sweep stick 20 will cause the picker stick 2| to move to the left to propel the shuttle S to the opposite side of the loom.

During the picking stroke the shoe 35 rolls along the rocker iron 25 and passes through the intermediate position shown in Fig. 5. The parts of the picking mechanism are so related that the cam 11 will be given approximately its full motion by the roll it at about the time that point 62 between surfaces 60 and BI engages the surface 26, or when the parts reach the position shown in Fig. 6. At this time therefore the full power of the picking force has been imparted to the shuttle and the useful working stroke of the picker stick has been completed. The picker stick however continues to move to the left as viewed in Fig. 1 due to its momentum, but as it continues to move the point of contact between the surface 26 and the shoe moves rapidly to the left, or to the end of the straight surface 6| to the point designated at a in Fig. 7. This point a becomes the pivot around which the picker stick and its shoe rocks in a counterclockwise direction as viewed in Fig. 3 against the action of spring 32, thereby effecting a sudden application of restraining force to the picker stick which tends to arrest the latter and overcome its momentum. When the picker stick has come to rest the surfaces 6!] and BI out of contact with the surface 25 except for the left end of the surface 6 l and spring 32 will tend to move the picker stick to the right as viewed in Fig. 1 to return it to its normal outward position shown in Fig. 1. Because of the spring and the fact that the inner or left end only, Fig. 3, of the shoe engages the rocker iron, the stick tends to return rapidly from the position shown in Fig. 7 to that shown in Fig. 6 and then continues to move through the position shown in Fig. 5 until it reaches the position in Fig. 4.

During upward movement of the picker stick when the parts move from the position in Fig. 6 to that shown in Fig. 7 the guide 43 moves along the roll 58. The guide 43 is held against th roll 55) by spring 32 throughout the entire rocking movement of the shoe, this rolling movement being down with respect to the roll 50 while the surface Ell is rocking along the surface 26, and being up when the picker shoe turns around the point a as a center.

From the foregoing it will be seen that I have provided simple means by which a picker stick can be checked at the end of its inward stroke and started back with a quick return movement due to the fact that the under surface of the shoe is provided with a straight surface 6 I. This surface merges with the curved surface til at a point 62 adjacent to the guide 43 and the picker stick. The straight surface 6| engages the surface 26 at about the time that the cam I! has received its full motion from the picking roll l5.

Having thus described my invention it will be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and I do not wish to be limited to the details herein disclosed, but what I claim is:

1. In picking mechanism for a loom operating with a picker stick and having a rocker iron which oscillates with the loom lay and is provided with a flat upper surface, a shoe secured to the picker stick and resting on said flat surface, said shoe having an under surface part of which is convex and part of which is straight, and resilient means holding the shoe and picker stick normally in such position that the convex surface of the shoe engages the flat surface of the rocker iron and the straight part of the under surface of the shoe is above said flat surface, said flat upper surface, convex and straight surfaces being so related that the picker stick during the first part of a working stroke thereof causes the convex surface to rock along said fiat surface and during a later part of the working stroke causes the straight surface of said shoe to engage said fiat surface prior to the end of the Working stroke of the stick, the end of said straight surface remote from the convex surface forming a temporary pivot with said fiat surface near the end of the working stroke of the picker stick to cause upward movement of the shoe relatively to the rocker iron against the action of said resilient means.

2. In picking mechanism for a loom having a picker stick which moves from the normal position thereof on a working stroke thereof, the loom having a rocker iron which oscillates with the loom lay and is provided with a flat upper surface, a picker shoe secured to the picker stick and having a convex bottom surface extending from one end thereof toward the stick and having also a straight surface merging with the convex surface extending from the other end thereof toward the stick, and resilient means normally holding the picker stick and shoe in such position that said convex surface engages said fiat surface of the rocker iron and said straight surface is above said flat surface, the fiat surface of the rocker iron and said convex and straight surfaces being so related that the picker stick on a working stroke thereof causes the convex surface of the shoe to roll along said flat surface of the rocker iron during the first part of the working stroke of the picker stick and causes the straight part of said shoe thereafter to engage said flat surface during the remainder of the working stroke of the picker stick and causes that end of said straight surface remote from the picker stick to form a temporary pivot with the said flat surface to effect upward movement of the shoe relatively to the rocker iron as the picker stick approaches the end of its working stroke.

3. In picking mechanism for a loom having a picker stick which moves from the normal position thereof on a working stroke thereof, the loom having a rocker iron which oscillates with the loom lay and is provided with a flat upper surface, a picking shoe secured to the picker stick and having convex and straight under surfaces for successive engagement with said flat surface during a working stroke of the picker stick, resilient means connected to the picker stick and normally holding the shoe with the convex surface thereof in engagement with said flat surface, and means causing said resilient means to resistmovement of the shoe with respect to the rocker iron from the normal position of said shoe to a position in which the straight surface of said shoe engages said fiat surface, the picker stick on a working stroke thereof causing said convex surface to roll along said fiat surface of the rocker iron and then cause engagement of said straight surface with said fiat surface and thereafter causing said shoe to move about a temporary pivot between the fiat surface and that end of the straight surface remote from said convex surface against the action of said resilient means.

4. In picking mechanism for a loom having picking mechanism operative to move a picker stick toward the center of the loom on a picking stroke, the picker stick because of the momentum thereof continuing to move toward the center of the loom after completion of operation of the picking mechanism, a rocker iron located adjacent to the lower end of the picker stick and having a fiat upper surface, a picker shoe securedto the picker stick and extending on opposite sides of the latter with respect to the center of the loom, the under side of that part of the picker shoe beyond the picker stick with reference to the center of the loom being convex and the under part of the picker shoe between the picker stick and the center of the loom being straight, said convex and straight parts being adapted for successive engagements with said fiat surface, and resilient means normally holding the picker stick and shoe in a position corresponding to the beginning of a working stroke of the picker stick with said convex part engaging said fiat surface, said convex and straight parts of the shoe being so related to said flat surface that the convex part rolls along said flat surface during the first part of the operation of the picking mechanism, said straight part thereafter engaging said fiat surface during the latter part of the operation of the picking mechanism and cooperating with said resilient means and flat surface to arrest the momentum of the picker stick.

5. In picking mechanism for a loom having picking mechanism operative to move a picker stick toward the center of the loom on a picking stroke, the picker stick because of the momentum thereof continuing to move toward the center of the loom after completion of operation of the picking mechanism, a rocker iron located adjacent to the lower end of the picker stick and having a flat upper surface, a picker shoe secured to the lower end of the picker stick and resting on said flat surface, and resilient means connected to the picker stick tending to hold the latter and the picking shoe in normal position preparatory to the beginning of a Working stroke of the picker stick, said shoe having a convex surface which engages said fiat surface of the rocker iron when the picker stick and shoe are in normal position and said shoe having a straight surface merging with the convex surface and adapted for engagement with said flat surface near the end of a picking stroke of the picker stick, said picking mechanism operative to give the picker stick a working stroke and cause said convex surface to roll along said flat surface during the first part of a picking stroke of the picker stick and thereafter cause engagement of said straight surface with said flat surface, the picker stick thereafter upon completion of operation of the picking mechanism tending due to the momentum thereof to continue the working stroke, that end of the straight surface remote from the convex surface thereupon forming a temporary pivot with the flat surface around which the picker shoe and stick move as a center against the action of said resilient means.

' BENJAMIN W. BROUWER.

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