US3537632A

US3537632A - Detachable cover for a pull roll or collar

Info

Publication number: US3537632A
Application number: US742369A
Authority: US
Inventors: Raymond S Watson
Original assignee: WARD TURNER MACHINERY CO
Current assignee: WARD TURNER MACHINERY CO
Priority date: 1968-07-03
Filing date: 1968-07-03
Publication date: 1970-11-03
Anticipated expiration: 1987-11-03
Also published as: NL166899C; FR1589866A; NL6818187A; DE1815928A1; GB1181749A; JPS5011803B1; NL166899B

Description

Q Unlted States Patent 12 Inventor RIJIOIIIS. Watson -[56] ReferencesCited y UNITED STATES PATENTS 211 Appl. No. 142,969

696,416 4/1902 Denegre.... 29/129x 221 Flled July 3,1968

986,712 3/1911 l-llpp 29/124 23;: magi" meme" Comm 2, 10,545 8/1939 Burton 29/124 I H r 3,462,058 8/1969 Redman 226/191 W mm Primary Examiner-Allen N. Knowles DETACIIABLE COVER FOR A PULL ROLL OR COLLAR Anorn'ey Walter G. Finch ABSTRACT: Pull rolls and pull collars having manually n chm. 8 m detachable split covers of resilient material, and provided with US. 226/191, circumferential notches and under cuts for engaging and 29/129 retaining the covers, are disclosed. llt. PL B65h 17/20 Both collar and cover are split, in a preferred embodiment Field of Search 226/ 190, of the invention, and the cover is extended radially onto a 191; 29/124, 125, I29, l32 uniform circumference of the collar.

Patented Nov. 3, 1970 3,537,632

/0 5 l2 I SHEET 2 /MATER/AL L Flaz PULL ROLL ASSEMBLY F/6 f I 47 3 F/G.4 l6 1 I FIG. 7

FIG. 8 INVENTOR Raymond 5. W0 rson ATTORNEY longitudinally and which are gear driven in synchronism.

Commonly, one roll of the pair is made of metal and the opposed roll is covered with a resilient material; or both rolls can be covered with a resilient material.

()ften, as for handling freshly printed paper, one roll is relieved in the center so that the sheet material is touched only along the margins ofthe sheet. Such relief may be provided by attaching collars to a shaft in'lieu ofusing a relieved solid roll, in which case axial spacing between the collars may be adjusted as required to draw particular widths of sheet material.

The radial spacing of pull rolls is usually made adjustable to compensate for wear. l-loweventhe resilient covers eventually become worn beyond adjustment and must be replaced. It is also to be point out that's heet fed machines using pull rolls will wear unevenly and no longer feed properly, or can be damaged in a jam-up.

In the prior art, replacement of resilient covers typically requires disassembly of rollers from the process machinery with time required for replacement and readjustment. Loss of production may be aggravated by delay in securing replacement covers. Care is requiredin the disassembly to avoid tool damage to the surfaces ofadjacent rollers. Where the cover is cemented in place, imperfect cementation can result in loss of traction and stoppage of the process involved.

It is, therefore, an object of thepresent invention to provide improved pull rollsandpull collars having resilient covers which are replaceable without disassembly'of any part other than the covers.

It is a further object of this invention to provide covers which are quickly, easily, and safely detachable by hand, without the use of tools. Y

Another object of this'invention is to provide pull rolls with covers which snap into place, and aresecure againstcircumundercut from a point above the pitch diameter to a point below the root dia'meter'of the gear and from shoulder 24 to ferential, radial, and axial displacement, without the use of adhesives.

Yet another object of this'inventionis to provide pull roll assemblies having split covers with smooth and uniformly resilient peripheral areas.

Still another object of this invention is to provide pull roll assemblies fashioned to standard machine component, designs, but adaptable to wide a variety of roller types and industrial applications.

To provide pull rolls with replacement covers which are quickly and easily made as required, is yet another object of this invention.

The essence of this invention lies in provision of pull rolls, collars, and split collars, having circumferential notches and undercuts engaging and securing manually replaceable split covers of resilientmaterial.

Other objects and attendant advantages of this invention.

FIG. 4 is a face view in partial-section of a pull collar and a cover-half;

FIG. 5 is a section ofa mold for making pull'collar covers; FIG. 6 is a longitudinal section of a pull roll and cover assembly;

FIG. 7 is an end view, of the FIG. 6 assembly; and

FIG. 8 is a section of a further cover configuration, according to this invention.

With reference now to FIG. 1 of the drawings, reference numeral l0 depicts a pull collar and cover assembly affixed to a shaft S of part of a typical pull-roll assembly. An identical pull collar is shown at right, in section.

Peripheries of the pull collars have resilient covers 14 which bear on ametal roll M. The metal roll is geared at G to rotate with collar shaft S. An extended end of shaft S is rotationally driven by means (not shown).

In FIG. 2, there is shown a sheet material being pulled through the pull roll assembly by rotation of the pull collar 12 and cover assembly 10, and metal roll M, between which the sheet is caught. In FIGS. 3 and 4, the pull collar 12 is shown assembled with half ac'over 14.

Collar 12 is preferably made of cast iron, free machining brass, or other suitable metal. It is preferably split as at 13 and as shown in FIG. 4 into two equal parts and 12b, for ready assembly on and removal from, a shaft. The two parts are joined by screws 16, as shown in FIG. 3, and the collar 12 is locked to a chosen shaft by a screw 18.

The following provisions are made for securing the cover 14 to the collar 12. A notched ring or gear, having preferably an even number of teeth 22, is formed in the exterior of the collar 12, as shown in FIGS. 3 and 4.

No particular number of teeth is required. Uniform tooth size and spacing are preferred but are not essential. The teeth are preferably tapered in both sectional views, narrowing radially outwardly, to facilitate assembly of the cover. This is made clearer later. The shape of commercial timing belt teeth is well suited for the application.

The gear is defined axially by a shoulder 24 at the end of the collar, and a groove 26, leaving a circumferential land 28 on the exterior of the collar.

Cylindrical holes 30 and 32- are milled between teeth 22a and teeth 22b on opposite ends. of a diameter of the collar and at the split 13.

Size of the holes is made such that the teeth are substantially groove 26.

Cover 14 is preferably made in two equal parts corresponding to those of the collar 12, the splits being on the same diameter as the splits in thecollar.

Preferred material for the cover is solid polyurethane, although rubber or other. flexible material may be used to suit specific applications.

FIG. 4 shows one-half of a cover 14 partly assembled on a collar 12 with the free end of the cover shown partly in section. The cover 14 is preferably made by casting polyurethane in a ring mold having the shape of the collar, to secure a close, uniform fit to the teeth 22, the holes 30 and 32, the shoulder 24, groove 26, and land 28; FIG. 5 shows such a mold assembly 38. While the polyurethane is in the mold, the outer part 40 of the mold may be removed and the outside diameter of the polyurethane may be machine finished to the desired tolerance. FIG. 5 will be discussed in more detail later. The polyurethane is removed from the mold by cutting on the previously mentioned split diameter, leaving square ends on the cover 14 as at 34.

When two such square ends are abutted and snapped into hole 30 or 32, the molded hemicylinders 36 securely lock the cover 14 to the collar 12 at that point.

The cover 14 is readily separated from the collar 12 by manually grasping a cover half at one of the split ends and twisting it; removal otherwise is quite difficult. The cover 14 remains secure in normal use, retained radially by engagement with the holes 30 and 32 at the split ends, retained axially by engagement with .the shoulder 24 and groove 26, and retained circumferentially by engagement with all the teeth 24, to prevent circumferential bunching of the cover 14 when it is pulling sheet material.

The portion of the cover 14 which extends over the land 28 is of uniform thickness and thus comprises a uniformly resilient peripheral area, providing smoother roller operation, as well as additional area for pulling sheet material.

It is not essential that the collar 12 be split, or that the split in the collar coincide with the split in the cover 14, as shown in FIG. 4. However, an advantage of the provision ,of coincident splits in the collar 12 and the cover 14 is that the pull collar assembly can be separated into halves and bolted onto a shaft with the cover 14 in place on the collar 12.

FIG. 5 shows a mold assembly 38 for casting covers 14 of solid polyurethane. The outer ring 40 is made of rigid, machinable material such as mild steel, and is closely fitted to the collar mold. An actual collar 12, FlG. 3, may be used as part of the mold. Urethane in plastic form is poured into mold assembly 38 and hardened or cured therein using techniques well known in the art. The outer collar 40 is then removed, the outside diameter of the molded polyurethane cover 14 is machine finished, if not within tolerance, the cover 14 is split by cutting, as previously described, and the cover 14 is removed, ready for use.

FIGS. 6 through 8 show several variations on the embodiment of the cover described in reference to FIGS. 1-5, which are also applicable to that embodiment.

In FIG. 6, cover 44 is mounted on a solid roll 46, shown in section. No part of the cover 44 extends over circumferential land 48, although such extension can easily be fashioned to the desired length, as described above.

FIG. 7, an end view of HO. 6, illustrates another variation, a single split in the cover, at 50. Since the cover material is chosen to be flexible in most applications, one split can be enough for removal of the cover 50.

FIG. 8, a section of a cover 52, shows a variation in proportion, the cover 52 being adapted to fit wide, shallow. teeth, as over the entire length of a roll. The undercut in such case may extend any convenient distance into the roll.

It is to be noted that, in addition to the above, metal male heads used in conjunction with covered resilient heads, are widely used to score or crease fibre or corrugated board. The

use of these detachable resilient covers for this application is part of this invention.

Obviously many modifications and variations of the present I the said circumference of. said pull roll in engagement with all said teeth thereof and in engagement with the undercut adjacent the said split, said resilient cover having an extension onto said uniform circumference.

2. in the combination as recited in claim I, wherein said undercut between said pair of teeth of said pull roll is a cylindrical aperture arranged substantially parallel to the axis of said pull roll.

3. in the combination as recited in claim 1, wherein the respective said uniform circumference and said teeth of said pull roll are separated by a groove.

4. In the combination as recited in claim 1, wherein a said tooth of said pair of teeth of said pull roll is radially tapered in section.

5. In the combination as recited in claim 1, wherein said pull roll has a uniformly distributed plurality of teeth, including the said pair of teeth, on the said circumference of said pull roll.

6. In the combination as recited in claim l, wherein said resilient cover is composed of solid polyurethane.

7. in the combination as recited in claim 1, wherein said pull roll comprises a collar having a split passing through said undercut between said pair of teeth a second pair of teeth on said collar with an undercut therebetween, and a second said split passing therethrough, with said resilient cover having plural splits respectively coincident with said splits in said collar.

8.'ln the combination as recited in claim 7, wherein said collar is circular and the respective splits in said collar are at opposite ends of a diameter through said collar.

9. As an article of manufacture, a radially split resilient cover for a pull roll having a pair of teeth on a circumference thereof and an undercut between said teeth and having a uniform circumference axially adjacent said pair of teeth, with said radially split resilient cover having a tooth thereon with a radial split therebetween for fitting around said circumference of said pull roll in engagement with all said teeth of said roll and in engagement with said undercut adjacent said split of said cover, with said resilient cover having an extension onto said uniform circumference.

10. In an article of manufacture as recited in claim 9, whereinsaid radially split resilient cover is composed of solid polyurethane.

11. in combination,- a collar having a pair of teeth on a circumference thereof and an undercut between the teeth, and a radially split resilient cover fitted around the said circumference in engagement with all said teeth and in engagement with the undercut adjacent the said split, said collar having a split passing through the said undercut, with a second pair of teeth in said collar with an undercut therebetween and a second said split passing therethrough, said resilient cover having plural splits respectively coincident with said splits of said collar.