US2276790A - Cloth pressure mechanism for takeup rolls - Google Patents

Description

March 17,1942. A. PALMER CLOTH PRESSURE MECHANISM FOR TAKE-UP ROLLS Filed Feb. 21, 1941 INVENTOR ALBERT PRLMER- 5L4 4. Mug

Patented Mar. 17, 1942 CLOTH PRESSURg MECHANISM FOR TAKE- P ROLLS Albert Palmer, Worcester, Mass, assignor to Crompton & Knowles Loom Works, Worcester, Mass, a corporation of Massachusetts Application February 21, 1941, Serial No. 379,912

11 Claims.

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 beats 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. Temples are customarily employed to stretch the cloth to prevent too great a shrinkage and thereby reduce the lateral wearof 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 relative 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 sufficient 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 producedv 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 line yarns and it is another object of my present invention to provide means for holding cloth in close contact with the takeup 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 different widths.

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

In the accompanying drawing, wherein two forms of the invention are 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 Fig. 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 4-4 of Fig. 3,

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

Fig.6 is a vertical section on line 6-6 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 l and H are connected by a breast beam l2 preferably of angular section and'having top and side webs l3 and I4, respectively. A take-up roll l having a roughened surface [6 extends across the loom and has its ends supported in brackets l1 secured to the loom-sides. These brackets also support rear and bottom guide rolls I8 and 19, respectively. In the bottom of the loom is mounted a cloth roll on which is wound the fabric F.

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

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 held adjustably with respect to the width of the loom on a bracket 26 secured to the breast beam and extending under the cloth being woven. The reciprocating bar 21 customarily used in temples has projecting laterally therefrom a head 28 in which is mounted the burr or pod 29 the effect of which is to stretch the cloth at a point near the fell.

A 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 the lay 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 the front center position indicated in Fig. 3 the reed R will be against the fell of the cloth and the latter will be temporarily slackened 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 lay recedes the cloth has a slight rearward motion to be in position for the next beat-up. The amount of this back and forth motion of the fell of the cloth varies with different fabrics but will be relatively large in the weaving of those fabrics to which my invention more particularly applies.

The cloth extends forwardly from the reed and templeover 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 tightens the selvages are moved slightly in an outward direction and there is therefore a continuing lateral motion of the selvage first toward and then 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 selvages 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 I6. The pressure unit itself is the same in both the preferred and modified forms of the invention and includes a rod 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 butwhen 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 sufiice 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 40 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 40 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 tthe rod 40, 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 rod 40.

The outer end of the shell 4| has secured therein a plug from which projects a trunnion and also the take-up roll. 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 5| by means of which the pressure unit is supported. The shell may be provided with a friction 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 BI! 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 held tightly against the lower friction surfaces in contact with the cloth 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 l6 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 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 H 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 15 is a compression spring 19. The screw 11 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 ll of the carrier will maintain the shells and their approximately as shown in Fig. '7.

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 takeup 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 slackened sufficiently 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 be 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. Herein I claim the specific form of my invention shown in Fig. 2, and claim the specific structure shown in Fig. '7 in a divisional application Serial No. 390,738, filed April 28, 1941.

What I claim herein is:

1. In a loom having a take-up roll to which the woven fabric extends from the weaving point to a line of tangency extending along the upper part of the roll, a pressure unit above the takeup roll having a, surface in contact with the cloth, and means attached to the unit for forcing the surface of the unit downwardly against the cloth to hold the latter against the take-up roll along said line of tangency.

2. In a loom having a breast beam and a rotating take-up roll to which the cloth extends from the breast beam to a line of tangency extending along the take-up roll, a rotatable pressure unit located over the cloth and extending along that part of the take-up roll over which the cloth selvage passes, and means to hold the pressure unit in close contact with the cloth to force the latter against the take-up roll along said line of tangency.

3. In a loom having a breast beam and a rotating take-up roll to which the cloth extends from the breast beam to a line of tangency extending along the take-up roll, a rotatable pressure unit located overv the cloth and extending along that part of the take-up roll over which the cloth selvage passes, and continuously acting means connected to the breast beam to hold the pressure unit in close contact with the cloth to force the latter against the take-up roll along said line of tangency.

4. In a loom having a breast beam and a rotating take-up roll to which the cloth extends from the breast beam to a line of tangency extending along the take-up roll, a rotatable pressure unit having a friction surf-ace located over the cloth and extending along that part of the take-up roll over which the cloth selvage passes, and means acting on the pressure unit to hold the friction surface thereof in close contact with the cloth to force the latter against the take-up roll along said line of tangency.

5. In a loom provided with a cloth guide bar and a take-up roll spaced from and in front of the bar, the cloth extending over and in contact with the bar to the take-up roll, a pressure unit having a friction surface over those parts of the bar and take-up roll over which the cloth selvage passes, and means to hold the unit with the friction surface thereof in close contact with the cloth thereunder at points above the bar and take-up roll and also that part of the cloth thereunder extending between the bar and takeup roll.

6. In a loom having a breast beam provided with a cloth guide bar and a take-up roll spaced from and in front of the bar, the cloth extending over and in contact with the bar to the take-up roll, a pressure unit having a friction surface over those parts of the bar and take-up roll over which the cloth selvage passes, and means connected to the breast beam to hold the unit with the friction surface thereof in close contact with the cloth thereunder at points above the bar and take-up roll and also that part of the cloth thereunder extending between the bar and take-up roll.

7. In a loom provided with a cloth guide bar and a take-up roll spaced from and in front of the bar, the cloth extending over and in contact with the bar to the take-up roll, a pressure unit over those parts of the bar and take-up roll over which the cloth selvage passes, and means to hold the unit in close contact with the cloth thereunder at points above the bar and takeup roll and also that part of the cloth thereunder extending between the bar and take-up roll.

8. A cloth pressure unit for a loom having a take-up roll and bearing means, said unit comprising an elongated rod to be located over the take-up roll, a pair of cylinders having friction surfaces, one cylinder for each end of the rod, trunnions extending from the cylinders for cooperation with the bearing means, and means to hold each cylinder to the adjacent end of the rod in any one of a plurality of longitudinally adjusted positions.

9. A cloth pressure unit for a loom having a take-up roll and bearing means, said unit comprising an elongated rod to be located over the take-up roll, a pair of cylinders having friction surfaces, one cylinder for each end of the rod, tr unnions extending from the cylinders for cooperation with the bearing means, and means to hold each cylinder to the adjacent end of the rod in any one of a plurality of longitudinally adjusted positions, said last named means including a split collar engaging the interior of the cylinder, a shell on the rod, said collar and shell having mutually engaging inclined surfaces, and means on the shell to engage the collar to cause relative longitudinal motion of the collar and shell with. respect to the rod to eifect expansion of the collar to cause clamping of the latter against the cylinder, whereby the rod, the shell, the collar and the cylinder may be made rigid with respect to each other at any one of the plurality of points along the rod.

10. In a cloth pressure unit for a loom having a take-up roll and bearings for the unit, said unit comprising an elongated rod to extend along and above the take-up roll, said unit comprising also a cylindrical shell at each end of the rod provided with an external friction surface, each shell having a trunnion to be received by the corresponding bearing, and means within each shell and surrounding the rod capable of being clamped to the shell and rod in any one of a plurality of relative positions of the shell with respect to the rod.

11. In a cloth pressure unit for .a loom having a take-up roll and bearing means, said pressure unit comprising an elongated rod to be located above the take-up roll and having a cylinder at each end of the rod from which projects a, trunnion for the bearing means, a pair of mutually engaging elements for each cylinder, one element engaging the rod and the other element engaging the inteorior of the cylinder and said elements having mutually engaging inclined surfaces, and means to cause relative motion of the inclined surfaces to effect expansion of one of the elements to clamp said elements and associated cylinder to the adjacent end of the rod.

ALBERT PALMER.

Images