US2131692A - Bowed expander roll - Google Patents

Description

Sept. 27, .1938. c. w. SHUTE BOWED EXPANDER ROLL Filed Feb. 1, 1937 Patented Sept. 27, 1938 uNirr.

This invention is expanders of the Mycock srar BOWED EXPANDER ROLL Charles W. Frederick vLeyland Machinery Company,

Application February 1,

11 Claims.

an improvement in bowed type for cloth and other continuous web material, and in particular relates to the bobbins which are mounted on a stationary curved shaft, to form an articulated curved roll usually rotated by drawing the web material over it, the outward component of travel of the surfaces of the bobbins asthey rotate in the and

planes oblique to utilized. to open travel of the material being expand the sheet of web material in both directions away from its middle line.

The bobbins comprising each roll are interlocked or clutched. together, or else fixed tightly in a common rubber their turning in unison, so

tube or covering, to ensure as to attain uniform spreading action across the width of the material and also to avoid bobbins or between excessive wear between the the bobbins and the cover.

Hitherto these clutches have been unsuited for use in rubber covered rolls, and when used in bare rolls have alway of the bobbins, being s been of the full diameter made as by forming a rectangular recess at two or more spaced points in the cylindrical cloth engaging of the bobbins, so

surface at the ends that the projections thus formed on the end of each bobbin will fit into the corresponding recesses 'made in the clothengaging surface at the end of the adjacent bob bin.

In use, these expander rolls are subjected to very considerable strains and vibrations, with the result that the co-engaging driving shoulders on the clutches thus formed on adjacent bobbins of these bars, all-metallic expander rolls pound burrs onto the These burrs prick the upper edges of the clutches. cloth as drawn around the rolls, making fine perforations both by spreading the yarns and by cutting and breaking the yarns themselves, and otherwise damaging the quality of the fabric.

A further drawback is that on starched goods,

the edges of the driving shoulders of the clutches press into and leave objectionable marks on the surface of the fabric.

In addition, the exposed bins in this outside type of clutch strive to pull the same longitudinal elements or warps of the cloth simultaneously closely spaced interva in opposite directions at is in the length of the cloth Shute, Boston, '1. Walsh, doing business as Thomas Mass, assignor to Boston, Mass.

1937, Serial No. 123.43%

in the zone where the cloth gently traveling This is objectionable as it orrica overlaps these diversurfaces of the two bobbins.

tends to pull the warps out of their intended straight-line extent in the fabric.

As the bobbins are annular ridges of saw-t0oth profile over the entire cloth-engaging surface, with a rake toward the ends of the roll, to enhance and hence the spreading into the peripheral teeth the frictional grip commonly made with action-of the rolls on the fabric, the warps which are sunk by tension of two adjacent clutch dogs of a pair of bobbins are subjected to a wrenching and shearing ing action where the drivwhat less than might otherwise be desired for most effective expanding, in order to avoid too harsh and distorting action on the warps Further, there is a tendency to pinch the between the ends of the bottoms of the cloth dogs of this type and the corresponding recesses in the adjacent bobbin. Also, this type of outside clutch permits chewed-up fragments of the felt greaseretaining collar, used inside the bobbins, to escape and stain the cloth.

To remedy these shortcomings in the standard Mycock type of bare to offer advantages metallic expander likewise obtainable in. the

rolls, and

case of rubber covered rolls, my invention comprises the provision of improved bowed expander :30

bobbins having the devices which clutch adjacent bobbins together to rotate in unison wholly below or of the bobbins, or within ripheral surfaces which the rubber cover in the In its preferred form; diameter clothor coverbobbin contains no recess cut disposed within the web-engaging. surfaces corresponding pev the interior of the engage 7 case of covered rolls.

the cylindrical or fullengagingsurface of the inits ends nor protrusions from such ends. Instead, the recesses and projections are formed on and in the endsof each bobbin at a lesser radius than the cylindrical or peripheral so that when put together inside the surface of the surface of the bobbin, the clutches are-wholly roll and shielded thereby from all contact with the cloth. Thus any burring which occurs on the clutch dogs cannot injure the cloth, no marking, shearingfeffects;

or distortion of the warps shoulders of can arise at the driving the clutches, there are'no open re- 7 cesses to collect lint,'starch, and-water, groundup greasy fragments'fromthe felt washer are impeded in their escape, can be made as sharp a and the annular teeth s desired, and there is faces of the clutch dogs meet, which limits 1 the depth and sharpness of the teeth to somepinch the cloth at the ends of are as will be made plain herein.

An illustrative embodiment of the invention is shown in the accompanying drawing, in which Fig. 1 shows a portion of the curved shaft at mid-width of a bare-roll bowed expander, with two of the improved bobbins thereon and shown in section, illustrating the manner of their interengagement, the curve of the shaft being exaggerated.

Fig. 2 is a side view of one of the improved bobbins, partly broken away.

Figs. 3 and 4 are end elevations of opposite ends of the bobbin of Fig. 2.

The novel bobbin comprising my improved bowed expander roll shown in Figs. 2, 3 and 4 has as usual in the case of bare expander rolls a working surface of generally cylindrical shape, equipped with sharp annular ridges or teeth I having a rake or slant all in one direction. This cylindrical surface extends for the full length of the entire surface of the bobbin which engages the cloth, without any projections or recesses in its unbroken terminal peripheral edges or rims at either end. At locations wholly below the ridged cloth-engaging surface there are formed on the ends of each bobbin projecting integral clutch fingers or dogs 3, of segmental shape and concentric with the axis of the bobbin,

of the bobbin. These dogs 3 may be of any suitable or desired number and extent in a direction around the axis, preferably having an extent equal to the spaces or intervals left between the several dogs and thus being equally spaced about the circuit of each end. The end of each bobbin is recessed as indicated at 5 between each two projecting dogs 3, so that when put together Fig. 1 practically the entire length of each dog 3 is received within and shielded by the corresponding recess 5 in the end of the adjacent bobbin. The material of the end is also removed just inside the dogs 3 to the same depth as the dog-receiving recesses 5, to form an annular space 8 extending all the way around the circuit of the end, in which cylindrical. felt collars 9 are located, and to leave a hub II in which is fixed a bushing 3 to bear against the surface of the shaft. The felt collar 9 seats simultaneously In the bottom of the space 8 of both bobbins when in working relation, to prevent the escape of dirt and lubricant outwardly; from the bearing surfaces.

The parts are fitted so that the opposing rims l5 of the adjacent bobbins will not be allowed to come into contact with or approach very closely to each other at the concave side of the shaft, or at any point where engaged by the rotation so that the between the opposite Preferably, as shown in Figs. 1 and 2, this is accomplished through extending the hubs l I axially outward far enough to bring the flanges of the bushings B into bearing engagement with each other before the rims [5 can engage each other. This may also be attained by making the mutually interlocking dogs 3 and their corresponding recesses of such length and depth that the dogs bottom in the recesses and hold the rims I5 apart at the concave side'of the roll.

on the curved shaft 1 as in The dogs 3 have their exterior surfaces tapered slightly, to facilitate their entry into the recesses of each adjacent bobbin, and to provide for the disalignment of the axes of the bobbins; similarly, the driving shoulders I! of each-dog are given a slight and equal taper toward each other.

Application of the inventions principle of putting the clutches below and Withinthe periph- The teeth I are omitted from the bobbin, which may have either a smooth cylindrical surface to engage the interior of the rubber covering or any of the known polygonal, ridged, or ribbed surfaces designed to hold the cover against rotation with respect to the bobbins. vious, the cover is relieved of the wrenching strains of having to drive individual lagging bobbins whose bearings run dry or bind on the curved shaft, since interlocking bobbins may thus' be used inside the cover without the clutches pinching and chewing the inside of the cover and wedging the torn-off bits of rubber in the clutch form lumps distorting the exterior surface of without departing tion as expressed 'do not wish to be shown, or to the but from the scope of the invenin the claims. Therefore, I limited to the particular form details of construction thereof,

cloth between adjacent bobbins.

3. In a bowed expander for web 4. In a bowed expander for web materials, in

/ M g nder bob- 1 H m] I mlhionii Wham

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