US2276791A - Cloth pressure mechanism for takeup rolls - Google Patents

Description

A. PALMER March 17, 1942.

-CLOTH PRESSURE MECHANISM FOR TAKE-UP ROLLS Original Filed Feb. 21 1941 iNvENT R ALBERT PALMER.

ATTORNEY Patented Mar. 17, 1942 CLOTH PRESSURE MECHANISM FOR UP ROLLS Albert Palmer, Worcester, Mass., assignor to Crompton & Knowles Loom Works, Worcester, Mass, a corporation of Massachusetts Original application February 21, 1941, Serial No.

379,912. Divided and this application April 28, 1941,Serial No. 390,738

acnims. (01. 139-304) This is a division of my co-pending application Serial No. 379,912, filed February 21, 1941'.

This invention relates to take-up mechanisms for looms and it is the general object of the invention to prevent relative slippage of the cloth with respect to the take-up roll when the lay heats up.

That part of the cloth which extends for several inches in front of the reed tends to contract and ordinarily is of less width than the cloth fell. Iemples are customarily employed to stretch the cloth to prevent too great a shrinkage and thereby reduce th'e lateral wear of the warp threads against the reed dents. The part of the fabric in front of the temples is held taut when the lay is in rear position, but responds to the tendency to contract when slackened by the lay beat-up. If this contraction is considerable there is an objectionable relativ sliding of the cloth along the take-up roll in the direction of the length of the latter, and when fine yarns such as rayon are employed this sliding causes suflicient abrasion to break the fine yarns and reduce the value of the cloth. It is an important object of my present invention to provide means for preventing this lateral slippage of the fabric by means of a pressure roll or unit which will hold the cloth tightly against the take-up roll.

At beat-up the slackness temporarily produced in the fabric also has a tendency to lessen the grip or hold which the take-up roll has .on the cloth and there is a slight forward angular motion of the latter with respect to the take-up roll. When the reed moves rearwardly the cloth is again tightened to cause a relative rearward motion of the cloth with respect to the take-up roll. This back and forth motion also contributes to the abrasion of fine yarns and it is another object of my present invention to provide means for holding cloth in close contact with the take-up roll during beat-up.

It is a further object of my present invention to provide a pressure roll or unit adjustable as to length for the accommodation of fabrics of diiferent widths.

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 accompanying drawing, wherein two forms of the invention ar set forth,

Fig. 1 is a front elevation of a "loom having the preferred form of the invention applied thereto,

Fig. 2 is a vertical section on line 2-2 of 1,

Fig. 3 is an enlarged plan view in the direction of arrow 3, Fig. 1,

Fig. 4 is an enlarged detailed vertical section on line '44 of Fig. 3, 1

Fig.5 is a vertical section on line 5--5 of Fig.3,

Fig. 6 is a vertical section on line 66 of Fig. 4, and

Fig. '7 is a view similar to Fig. 5 but showing a modified form of the invention.

Referring to the drawing, the loomsides l0 and H are connected by a breast beam l2 preferably of angular section and having top and side webs -l3- and M, respectively. 'A take-up roll it having a roughened-surface [.6 extends across the loom and has its ends supported in brackets I! secured to the loomsides. These brackets also support rear and bottom guide rolls l8 and t9, respectively; .In th bottom of the mom is mounted a cloth roll it on which is wound the fabric F. V

Any approved form of driving mechanism, designated generally at D in Fig. 1, can be .employedfor effecting gradual rotation of :thetakeup roll in the direction of arrow 11, Fig. 2 and also for causing rotation of the cloth roll in a direction to wind thereon the fabric received from th take-up roll. ,The breast beam may have secured thereto a cloth guide barZl which extends across th loom.

The loom will be provided at each side with a temple T one of which is shown-in Fig. ,3. The temple has a foot 25 held adjustably with respect to the width of the loom on a bracket 2-6 secured to the breast beam and extendingunder the cloth being woven. The reciprocating bar 2'! customarily used in temples. has projecting laterally therefrom a head 28 mounted the burr or pod.2-9 the effect of which is to stretch the clothat a point near the fell.

vA lay 30 is reciprocated horizontally by connectors one of which is shown at 3! in Fig. ,2. In the present instance the lay is shown as being provided with a series of shuttle boxes .32 which may be moved vertically with respect to th la to render any one of several weaving shuttles active but these shuttle boxes are not necessary. The lay is provided with a reed B, through which extend the warp threads W.

When the lay is in thefront center position indicated in Fig. 3 the reed R will be against the fell of the cloth and the latter will be temporarily s'lackened and will move forwardly due to the pressure exerted by the reed when beating .the last laid pick: of filling "into *the cloth. As'the in which .is-

and temple over the bracket 26 and guide bar,

2| to the take-up roll, where it engages the roughened surface l6 and extends partly around the latter to be fed gradually forwardly during loom operation toward the cloth roll.

The parts thus far described may be of usual construction and of themselves form no part of my present invention. The recurring loosening and subsequent tightening of that part of the cloth between the reed and the take-up roll occurs with each forward beat of the lay and during the slackening of the cloth its natural tendency to contract moves the selvages S toward the center of the loom. When the cloth again tightens the selvages are moved slightly in an outward direction and there is therefore a continuing lateral motion of the selvage first toward and them away from the center of the loom. During beat-up the accompanying slackening of the fabric results in a slight reduction in the pressure between the cloth and the surface l6 and the fabric tends to move forwardly slightly With respect to the roll.

In carrying my present invention into effect I provide a pressure unit for maintaining the fabric, or at least the selvage thereof, in contact with the take-up roll to prevent the continually recurring slackening of the fabric from causing slippage of the cloth along the roughened surface IS. The pressure unit itself is the same in both the preferred and modified forms of the invention and includes a rod 40 extending across the loom above the take-up roll and having attached at each end thereof a pressure roll or cylinder 4| which may be a hollow metal shell. When the cloth being woven is relatively wide the shells will be in an outwardly adjusted position with respect to the rod but when the cloth is narrow the shells will be moved along the rod toward the center of the loom. The shells at both ends of the rod are the same and a description of one of them will suffice for both.

The inner end of cylinder 4| receives a collar 42 having an internal tapered surface 43 having its lesser diameter toward the center of the loom. A sleeve 44 inside the collar has a close fit with the rod 48 and is provided with a tapered surface 45 which engages the taper 43, and there is extending inwardly from the sleeve a threaded shank 46 on which is screwed a nut 41. The

collar 42 is split longitudinally as at 48, see Fig. 6, while the sleeve 44 has a corresponding split 49, these splits permitting slight expansion of the two parts. When the proper position for the shell 4| with respect to rod 4|) is determined the nut 41 will be tightened to draw the sleeve 44 toward the center of the loom and thereby expand the collar 42 and compress sleeve 44, thereby causing the rod 4fl, sleeve 49, collar 42 and shell 4| to be held together tightly with respect to each other. A key 55 prevents relative turning of collar 44 or red 40.

The outer end of the shell 4| has secured therein a plug 50 from which projects a trunnion 5| by means of which the pressure unit is supported. The shellmay be provided with a fric- 4| drawn toward the bar 2| and also the take- ,up roll.

tion surface 52 formed of any approved material, such as rubber, felt, or the like.

In the preferred form of the invention I provide a mounting for each end of the pressure unit which will hold it against the bar 2| and the take-up roll. As shown in Fig. 5 a carrier arm is pivoted on the adjacent gudgeon 5| and has the lower end thereof attached as at 6| to a relatively heavy tension spring 62 the lower end of which is attached as at 63 to a clip 64 preferably of angular form and having a front upwardly projecting finger 65 held tightly against the lower edge of the web M by the spring 62. The latter is strong enough to pull the pressure unit down and hold it in substantially the position shown in Fig. 5 with the shells It is to be understood that there will be a carrier arm 60 at each end of the pressure unit and that the springs 62 cooperate to hold the pressure unit in such a position that both selvages are forced tightly against the bar 2| and the take-up roll. The bar 2| is ordinarily smooth, being formed of polished metal, but the friction surface of the shells 4| will serve to prevent any appreciable movement of the fabric along the bar 2| toward the center of the loom when the loom beats up. The fabric is held in close contact with the frictional surface of the pressure unit which is additional to the roughened surface I6 and "these two surfaces cooperate to prevent motion of the selvage toward the center of the loom. The pressure unit is free to rotate on the carriers 6|) as the cloth advances.

In the modified form of the invention the pressure unit has no cooperation with the bar 2| but is held in such position as to engage the cloth substantially at the point of tangency between the fabric and the take-up roll. In this form of the invention each end of the roll will have its gudgeon 5| received by the rear end ll of a carrier 12 in the upper face of which is a concave pocket 13 to contact the forward and under surface of a portion of the bar 2|. A rearwardly and downwardly extending arm 15 of the carrier has projecting upwardly therethrough the stem 16 of an adjusting screw 11 having a shoulder 18 between which and the arm is a compression spring 19. The screw 1'! is threaded into a bracket which is held as by bolt 8| to the vertical web M of the breast beam, and can be adjusted to vary the pressure of the shells 4| on the cloth.

In the modified form of the invention the distance between the gudgeon 5| and the bar 2| as determined by the length of forward arm II of the carrier will maintain the shells and their friction surfaces in contact with the cloth approximately as shown in Fig. '7. v 1

In the preferred form of the invention the loom will slacken the fabric periodically as already set forth but the fabric will be held against lateral motion toward the center of the loom by the pressure unit which engages the cloth at the bar 2| and also the take-up roll. In the modified form of the invention the lateral motion of the fabric can occur along the bar 2| which is smooth but is prevented with respect to the take-up roll. In both forms of the invention the pressure unit provides a friction surface additional to that of the take-up roll to assist in holding the cloth spread to its full width, and in both forms the fabric is prevented from moving laterally with respect to the take-up roll and also from becoming s1ackened sufliciently to slip angularly along the latter at the time of beat-up.

From the foregoing it will be seen that I have .provided a simple means for preventing lateral and angular slippage of the selvages of the fabrics with respect to the take-up roll. It will further be seen that the shells on the end of the bar 40 can be adjusted to accommodate fabrics of varying Widths.

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 a loom having a breast beam provided with a cloth guide bar and a take-up roll in front of the bar, the cloth extending over the bar and becoming tangent to the take-up roll at a given point on the periphery of the latter, a pressure unit over the take-up roll, carrier means for the unit having engagement with the bar, and means connecting the carrier means to the breast beam to force said pressure unit downwardly on the cloth substantially at said point of tangency.

2. In aloom having abreast beam provided with a cloth guide bar in front of which is located a rotatable take-up roll, the cloth extending over the bar and being tangent to the takeup roll at a given point, a pressure unit over the take-up roll, carrier means on which the pressure unit is rotatably mounted, said carrier means engaging the bar and by such engagement locating the pressure unit over the cloth at said point of tangency thereof with the take-up roll, and means connected to the carrier means and breast beam to force the pressure unit downwardly against the cloth to hold the same in close contact with the take-up roll at said point of tangency. I

ALBERT PALMER.

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