US2246694A - Whip roll cam arm - Google Patents

Description

; une 24, 194% Junentor attorneys Patented June 24, 1941 WHIP ROLL CAM ARM William Thomas OShields', Seneca, S. 0., assignor to Bahan Textile Machinery Company, Greenville, S. 0., a corporation of South Carolina Applicationiseptember 19, 1940, Serial No. 357,413 (01. 139-115) 3 Claims.

This invention relates to textile apparatus and more especially to an improved cam arm which operates the whip roll.

In weaving cloth, the warp is usually drawn upwardly from a warp beam and over the whip roll from whence it passes substantially in a horizontal plane through conventional drop wires. The warp is then divided into groups of ends which in turn have their respective harnesses. By the proper manipulation of the harnesses, sheds are formed through which the shuttle passes and deposits the weft yarn and thereby forms cloth.

It is a well known fact that after the weft is beat up and the shed is closed by the harness, that the warp threads become slackened by reason of the closing of the shed. At this time, it is desirable to take up the slack so that substantially uniform tension will be present in the warp at all times. In order to effect this result, a cam is placed on the loom crank shaft for engaging the free end of a lever arm, the other end of said arm being adapted to oscillate the whip roll up and down to apply and relieve the warp tension at the proper time.

It is an object of this invention to provide an improved whip roll cam arm having a plurality of wearing surfaces on the free end thereof adapted to be placed in contact with the operating cam when necessary. Heretofore, these arms have been constructed of metal and having only one wearing surface. The result of such a construction has been quick wearing because of the metal-to-metal cont-act, and due to the fact that only one wearing surface was provided, the arm had to be discarded when it becomes worn and a new one placed in its stead.

I propose to provide a contact member of a softer material such as wood, so as to eliminate the excessive wear and also I propose to provide means for adjusting the contact member relative to the cam so that a number of wearing surfaces will be available.

Some of the objects of the invention, having been stated, other objects will appear as the description proceeds when taken in connection with the accompanying drawing, in which-- Figure 1 is a side elevation of a portion of a loom showing my improved whip roll cam arm in an installed position;

Figure 2 is an isometric view of the improved whip roll cam arm apart from the loom structure;

Figure 3 is an isometric view of a portion of the whip roll cam arm shown in Figure 2, omitting the adjustable wearing member;

Figure 4 is an isometric view of the adjustable wearing member which is adapted to be placed upon the restricted portion of the whip r-oll cam arm shown in Figure 3.

Referring more specifically to the drawing, the numeral denotes a side frame of a loom having mounted therein a let-off beam II. I This beam has warp material l2 wrapped th'erearound which emanates in sheet form [4 therefrom. The sheet of warp 14 passes upwardly over a whip roll I5 and thence in a substantially horizontal direction through conventional drop wires [6, after which the war-p i4 is divided into layers Ma and 14b. The layer Ma passes through one set of heddles l'l; whereas the layer Mb passes through another set of heddles l8. These heddles reciprocate up and down in a well known manner to form sheds through which a shuttle, not shown, passes to deposit the weft therein.

The whip roll I5 has its ends rotatably mounted in suitable notches or grooves in a lever 2|, and this lever, in turn, is fixedly secured on a shaft 22, which shaft is supported for oscillation by a bracket 23. Bracket23 has its lower end supported by a second bracket 24, which, in turn, is adjustably secured to the loom frame It) by any suitable means such as a bolt 25 which penetrates a slot 26.

The end of the shaft 22 has an arm secured thereon by any suitable means such as set screws 3|. This arm extends downwardly on an incline and the lower end thereof has integral therewith a restricted elongated bolt 32, said bolt being adapted to accommodate an elongated rectangular wooden sleeve 33, which sleeve has a bore 34 therein for fitting over the bolt. Also it will be noted by referring to the drawing, that the arm 30 has projections 35 integral therewith which are adapted to fit in radially disposed slots 36 in the ends of the elongated rectangular wooden member 33. When the sleeve 33 is properly installed upon the restricted bolt 32 in the manner shown in Figures 1 and 2, it is seen that the projections 35 prevent axial rotation of the sleeve 33 and thereby holds one face thereof in proper position for engagement with a cam 31 on a crankshaft 38. Suitable washers 39 are provided on the extreme lower end of the bolt 32 and also a nut 40 is threadably secured on this bolt for confining the sleeve in position.

When the loom is operating, the crank shaft 38 makes one revolution for each pick. As heretofore stated, when the heddles l1 and [8 are spread apart from each other to form a shed in the manner shown in Figure 1, there is a very much greater tension in the warp sheet I4 than will be the case when the layers Ma and Nb are in substantially the same plane. Therefore, when the Warp sheds Ma and Mb are spread apart from each other, it is necessary for the roller I5 to be lowered slightly so as to relieve this tension; whereas when the two sheets Ma and Nb occupy substantially the same plane, it is desirable for the roller l5 to be moved upwardly to prevent an excessive slack in the warp. This movement of the whip roll is effected at the proper time by means of the cam 31.

Especial attention is called to the fact that the sleeve 33 is made of a softer material than the cam 31, thereby preventing excessive wear, which always results from a metal-to-metal contact. Another decided advantage of a cam arm of this sort is the availability and interchangeability of a number of Wearing surfaces. In the present disclosure, there are four sides upon which cam 31 can operate, and either one of these sides can be presented to the cam merely by loosening the nut 40 and giving the sleeve a quarter-turn rotation, and then again tightening the nut. After all four of the wearing surfaces have been used with the sleeve in the position shown in the drawing, the nut 46 can be removed and the sleeve 33 turned end for end, and then four more surfaces will be available for contact with the cam. It is thus seen that a great saving has been effected, not only by providing a cam arm with a wearing surface made of softer material such as wood, but also a great saving has been provided by having the cam arm with an adjustable wearing surface so that a plurality of wearing surfaces can be presented for contact with the rotating cam on the crank shaft.

In the drawing and specification, there has been set forth a preferred embodiment of the invention, and although specific terms are employed, they are used in a generic and descriptive sense only and not for purposes of limitation, the scope of the invention being set forth in the appended claims.

I claim:

1. In a loom having a whip r011 oscillatably mounted about a pivot and also having a crank shaft with cam means thereon, a whip roll arm having one end thereof connected to said pivot, a bolt extending from said arm and a polygonal sleeve mounted on said bolt.

2. In a loom havin a whip roll oscillatably mounted about a pivot and also having a crank shaft with cam means thereon, a whip roll arm having one end thereof connected to said pivot, a bolt extending from said arm, a polygonal sleeve mounted on said bolt, and means for holding either of the faces of the sleeve in contact with said cam means.

3. In a loom having a whip roll oscillatably mounted about a pivot and also having a crank shaft with cam means thereon, a whip roll arm having one end thereof connected to said pivot, a bolt extending from said arm, and an elongated wooden sleeve mounted on said bolt, said sleeve having a plurality of notches therein, a projection on said arm adapted to engage one of said notches to prevent rotation of the sleeve on the bolt.

WILLIAM THOMAS OSHIELDS.

Images