US3334834A

US3334834A - Rolling head

Info

Publication number: US3334834A
Application number: US455712A
Authority: US
Inventors: Ralph L Davidson; Jr Edward F Kurtz
Original assignee: CURTIS AND MARBLE MACHINE Co
Current assignee: CURTIS AND MARBLE MACHINE Co
Priority date: 1965-05-14
Filing date: 1965-05-14
Publication date: 1967-08-08
Anticipated expiration: 1984-08-08

Description

ROLLING HEAD 3 Sheets-Sheet 1 Filed May 14, 1965 FIG.

INVENTORS L. DAVIDSON F. KURTZ, JR. MLW /W RALPH EDWARD BY ATTORNEYS g- 1967 R. L. DAVIDSON ETAL. 3,334,834

ROLLING HEAD 5 Sheets-Sheet 2 Filed May 14. 1965 INVENTORS RALPH L. DAVIDSON EPWARD F. KURTZ,JR.

ATTORN EYS 1967 R. L. DAVIDSON ETAL 3,334,834

ROLLING HEAD 5 Sheets-Sheet 5 Filed May 14, 1965 FIG. 3

IIIIIIIIIIIIm will/l4 F. KURTZ,JR.

ATTORNEYS United States Patent 3,334,834 ROLLING HEAD Ralph L. Davidson, Southborough, and Edward F. Kurtz,

Jr., Cambridge, Mass., assignors to Curtis & Marble Machine C0., Worcester, Mass, a corporation of Massachusetts Filed May 14, 1965, Ser. No. 455,712 Claims. (Cl. 242-65) This invention relates to the handling of textile fabrics and other web materials, and constitutes an improved take-up device for winding webs into rolls, commonly referred to as a rolling head.

In one type of rolling head the roll of fabric is peripherally driven by a drive roller, at a uniform linear speed. A difiiculty is often encountered when a surface irregularity develops, as may occur when a seam is driven past the drive roller. If the impact of the seam causes the roll of fabric to bounce or jump, the resulting forces between the roll and drive roller may create additional irregularities. As a result, the roll frequently develops lobes or an otherwise off-round contour which is not only undesirable in itself, but which produces inertial forces that may also cause severe vibration or shaking of the apparatus and the floor on which it is mounted.

The apparatus of the present invention is designed to accommodate spurious forces of this kind by permitting the parts of the machine which contact the web roll to yield to its motion, so that the slight impact which may start an elf-round condition to develop is absorbed in the mechanism.

In the rolling head of this invention the roll of fabric is wound on a tubular shell mounted on an arbor which is free to rise and fall in a generally vertical direction as the roll grows larger or as an irregularity might displace its axis. The weight of the roll is supported on a drive roller beneath the roll which also frictionally drives the roll in the winding operation. The drive roll is mounted on a resilient support which permits it to accommodate irregularities, and which is preferably damped so as not to reach the state of free resonance.

The rolling head of this invention will be better understood from the following description of the preferred embodiment, which is presented as illustrative of the invention. Reference is made to the drawings in which,

FIG. 1 is a front elevation;

FIG. 2 is a side elevation taken at section 2-2 of FIG. 1; and

FIG. 3 is a condensed plan view taken at section 33 of FIG. 2.

The rolling head is assembled on an open frame 10 of A section and consists essentially of an arbor 12 on which the web is rolled, mounted to move vertically as the roll enlarges, and a drive roller 14 which supports the roll and drives it peripherally at constant linear speed. Translational movement of the arbor is provided for by mounting it between end plates 16 carried by parallel racks 18 which are free to slide vertically in slots 19 along the front face of the frame 10. The racks 18 engage corresponding pinions 20 which are keyed to a shaft 22 traversing the front top of the frame between journal boxes 24, and are thereby constrained to move up and down together.

Each of the end plates 16 consists of a pair of downwardly facing parallel yokes 25 bolted to opposite sides of the rack, and an outer cheek plate 27 which prevents axial displacement of the arbor. Between the yokes of each end plate are a pair of rollers 28 which engage the ends of the top of the arbor and permit it to rotate freely. The arbor 12 is accordingly held down by, but not secured to, the end plates at each end.

The drive roller 14 is supported by bearings 32 on a pair of arms pivotally mounted near the back of the ice frame by means of a coupling rod 33 to which each of the arms 30 is pinned. The drive roller 14 is accordingly free to move about its pivot translationally as both ends are constrained to move essentially together.

Each of the arms carries a double step bracket 34 which provides two bearing surfaces, one of which engages a supporting compression spring 36, and the other of which is connected to the shaft of a double acting automotive shock absorber 38. The lower ends of the spring 36 and the shock absorber 38 are supported on the bed of the frame. These two elements together provide for resilient movement of the drive roller without the resonance effects characteristic of an undamped system.

Pressure between the roll of fabric on the arbor 12 and the drive roller 14 is maintained by an air cylinder 40 and piston 42 connected between the frame 10 and one of the racks 18.

Each of the racks 18 is formed with a fin 41 on its back side which is received in the slot 19, and a bracket 43 fastened to one of the fins 41 connects it with the piston shaft 42. Air under constant pressure, e.g., p.s.i.g., is fed from a regulator (not shown) to the piston inlet 44, and assures that a minimum contact pressure exists to drive the roll of fabric, particularly when a new roll is just beginning.

The air cylinder is also provided with an inlet at the other side, by which 'air may be admitted to raise the racks 18 for dofiing the roll.

The foregoing description covers the main features of the rolling head of this invention. As it is usual to provide that the fabric is full and flat as it enters the roll, a bow expander 45 is mounted in the lower part of the frame 10 adjacent to the drive roller 14.

The design of the resilient support for the roll of fabric will of course depend on the nature of the particular device, particularly the weight of the roll and drive roller, the speed of operation, and the frequency of the motion caused, or tending to be caused, by the irregularities in the roll. In general it is desirable that the frequency be considerably larger than the natural frequency of the spring suspended system, preferably by a factor of 10 or greater.

Well known analytical mechanics techniques may .be employed in selecting the supporting springs for any given system, by calculating first the static deflection 6 from the equation to )lg cos a a.=

Where:

w/w can be taken as 10 g=acceleration of gravity=386 in./sec. a=angle of racks 18 from vertical w=frequency of irregular motion The frequency of irregular motion depends on the amount of surface of the roll spanned by an irregularity, and on the speed at which the roll is driven by the drive roll. In a typical installation this frequency may be taken as 15 cycles per second, from which a is calculated as 4.8 inches. As a practical matter it has been found that 6 may vary from about 0.5 to 5 inches.

The spring constant K may then be calculated from the masses of the full roll M and the drive roller m, from the equation for any desired system.

, Damping of the system is desirable, particularly when the rolling head can be operated at various speeds and where vibrations at frequencies near the natural frequency may be encountered. The shock absorber should accordingly have a damping constant less than e.g., of about 3 0.2 times that required for critical damping when the roll is full sized.

It should here be noted that the mass increases as the roll builds up, and that the system is more highly damped at the beginning of the roll. Moreover, even though the mass increases, both the natural frequency of vibration w =Kg/M+m and the frequency of irregular motion w =NV/R, both vary inversely asthe radius R of the roll, and the ratio of w to w tends to be fairly constant.

In operation, the fabric 50 to be wound is led to the back of the rolling head, passed over the bow. expander 45, and then fed between the drive roller 14 and a tubular shell (which will remain with the roll as a core) retained on the arbor 12. A few turns 'are made by hand, and then, with air pressure applied to the air cylinder 40, the drive roller is started under power, which may be applied by conventional means (not shown).

From the foregoing description it will be seen that the rolling head of this invention accommodates the irregularities encountered in winding operations, and in particular it eliminates the transmission of vertical vibrations to the' floor on which it is mounted. Thus the major trouble of vibrations that cause a building to shake or the floor to bounce is avoided in the operation of the rolling head of this invention.

In addition it has been found that the improved resilient support system incorporated in the rolling head of this invention results in the development of much less of an off-round condition then has heretofore been experienced in peripherally driven apparatus. 7

Although this invention has been described with reference to its preferred embodiments, it is contemplated that modifications will readily occur to those skilled in the art and familiar with the principles herein disclosed, and that such may be made without departing from the scope of this invention. 7

We claim and desire to secure by Letters Patent:

1. Take-up apparatus comprising in combination,

a frame;

an arbor for receiving a roll of fabric mounted for substantially vertical motion on said frame;

a roller mounted beneath said arbor for supporting and driving a roll of fabric on said arbor; 7

resiliently movable means supporting said roller adapted to yield and accommodate surface irregularities in said roll; 4

and means rotatingsaid roll and roller. 3

2. Take-up apparatus comprising in combination,

a frame; V a

an arbor for receiving a roll of fabric;

means mounting said arbor on said frame and permitting substantially vertical translational motion thereof; a

a roller mounted beneath said arbor for supporting and driving a roll of fabric on said arbor;

resiliently movable means supporting said roller adapt- 7 ed to yield and accommodate surface irregularities in said roll; V V

and means rotating said 1011 and roller.

3.'Take-up apparatus comprising in combination,

a frame;

a spring, yieldable under the action of surface irregularities in said roll, supporting said roller and a damping device operable With said spring.

4. Take-up means as defined by claim 3, wherein the spring has a 'static deflection of about 0.5-5 inches under the weight of a full roll, and the damping device has a damping constantof about 0.2 times that required for critical damping. V

5. Take-up apparatus comprising in combination,

a frame; 7 r

a roller beneath said arbor for supporting a roll ofv an arbor for receiving a roll of fabric;

means mounting said arbor on said frame and permitting substantially vertical translational motion thereof;

a roller beneath said arbor for supporting a roll of fabric on said arbor;

means mounting said roller on said frame including:

a pair of spaced parallel arms supporting opposite ends of said roller,

the ends of said arms being pivotally attached to said frame and interconnected to move simultaneously,

a spring and a damping device engaging between said arms and said frame, whereby said roller may yield and accommodate surface irregularities in said roll;

and means for driving said roll and roller.

7. Take-up apparatus comprising in combination,

a frame;

a roller beneath said arbor for supporting a roll of fabric on said arbor;

means mounting said roller on said frame including:

a pair of spaced parallel arms supporting opposite ends of said roller,

the ends of said arms being pivotally attached t said frame and interconnected to move simultaneously,

a spring and a damping device engaging between! said arms and said frame, whereby said roller may yield and accommodate surface irregularities in said roll;

means urging said arbor downwardly against said roller,

and means for drivingsaid roller.

8. Take-up apparatus comprising in combination,

a frame having a generally vertical face open at the center;

a pair of acks mounted to slide vertically along opposite sides of said face; pinions interconnected by a shaft engaging said racks for simultaneous movement up and down; an arbor for receiving a roll of fabric supported by said racks; V

a drive roller having a horizontal axle beneath said arbor for supporting and driving a roll of fabric on said arbor;

a pair of parallel arms pivoted at one end to opposite sides of said frame interconnected by a rod;- bearings at the other ends of said arm carrying said drive roller;

and a spring and a damping device, if I V engaging between each of said' arms and said frame to provide resilient support for said drive roll, whereby said drive roller may yield andaccommodate sub face irregularities in said roll. 7

9. Take-up apparatus comprising in combinatio I a frame; I e r an arbor for receiving a roll of fabric mounted for substantially vertical motion on said frame;

a roller mounted beneath said arbor for supporting a roll of fabric on said arbor;

resiliently movable means supporting said roller adapted to yield and accommodate surface irregularities in said roll; 1

and means rotating said roll and roller.

10. Take-up apparatus comprising in combination,

a frame;

References Cited UNITED STATES PATENTS FRANK J. COHEN, Primary Examiner.

W. S. BURDEN, Assistant Examiner.

Claims

1. TAKE-UP APPARATUS COMPRISING IN COMBINATION, A FRAME; AN ARBOR FOR RECEIVING A ROLL OF FABRIC MOUNTED FOR SUBSTANTIALLY VERTICAL MOTION ON SAID FRAME; A ROLLER MOUNTED BENEATH SAID ARBOR FOR SUPPORTING AND DRIVING A ROLL OF FABRIC ON SAID ARBOR; RESILIENTLY MOVABLE MEANS SUPPORTING SAID ROLLER ADAPTED TO YIELD AND ACCOMMODATE SURFACE IRREGULARITIES IN SAID ROLL; AND MEANS ROTATING SAID ROLL AND ROLLER.