US2840888A

US2840888A - Edge finishing for dampening roller covers of lithographic plates

Info

Publication number: US2840888A
Application number: US597707A
Authority: US
Inventors: Paul N Guglielmo; Jacobs Herbert
Original assignee: Individual
Current assignee: Individual
Priority date: 1956-07-13
Filing date: 1956-07-13
Publication date: 1958-07-01
Anticipated expiration: 1975-07-01

Description

July 1, 1958 P. N. GUGLIELMO ETAL 2,840,888

EDGE FINISHING FOR DAMPENING ROLLER COVERS OF LITHOGRAPHIC PLATES Filed July 15, 1956 INYZ'NTDRS. Paul M aylzbna fiv'bert @6056 ag; W

United States Patent ice EDGE FINISHING FOR DAMPENING ROLLER COVERS OF LITHOGRAPHIC PLATES Paul N. Guglielmo and Herbert Jacobs, Brooklyn, N. Y.

Application July 13, 1956, Serial No. 597,707

1 Claim. (Cl. 29-119) This invention relates to the art of roller covers and particularly concerns a cover for a roller such as may be used to moisten lithographic plates in a lithographic printing process.

Roller covers of the type used in lithographic printing have been made of densely compacted felt, moleskin, flannel, and the like. These covers are formed as sleevelike structures with a longitudinal seam. The cover is mounted on a suitable roller in a stretched condition so that a smooth and unwrinkled surface is provided for moistening purposes.

Such roller covers tend to stretch and disintegrate unless the stitching is at least as strong as the material of the cover. The present invention is directed at providing a finishing means for the longitudinally stitched seam of a roller cover of the type described.

It has also been found necessary to provide some means of binding the raw or cut annular edges of the cylindrical cover whether made of woven or felted material. In the present invention there is provided a flexible means for binding these raw edges without increasing the bulk of the roller at the ends thereof.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawings, and to the appended claim in which the various novel features of the invention are more particularly set forth.

In the accompanying drawings forming a material part of this disclosure:

Fig. 1 is a perspective view of a roller cover embodying the invention. The cover is mounted on a suitable cylindrical roller.

Fig. 2 is a perspective view of a portion of the roller cover of Fig. 1 with the roller core removed to show interior structural details of the cover.

Fig. 3 is a cross-sectional view taken on lines 3-3 of Fig. 2.

Figs. 4, 5, 6 and 7 are perspective views of a portion of the cover showing various successive stages of fabrication thereof, the cover portion being inside out.

A rigid cylindrical roller 10 is shown in Fig. 1. This roller has shaft ends 11, 12 extending axially therefrom for mounting the roller in a lithographic printing press. On the roller core is a cover 14 snugly and tightly mounted. This cover is a cylindrical sleeve of felt, flannel, moleskin, or other absorbent material. 7 The cover is made of a rectangular piece of moisture-absorbent material and has a machine sewn longitudinal seam 15. The abutting edges of the seam are secured by stitches 16. Opposite ends of the row of stitches are terminated in

bar tacks

17, 18 disposed perpendicular to the seam 15. The stitching of the tacks is quite dense, and effectively prevents the ends of the seam from becoming loose since the strength of the tacks normally exceeds the strength of the material of the cover. The outer side 0 of the cover is shown in Fig. 1.

The unbound or raw annular end edges of the cover are provided with

welt cords

20, 21 round in cross-section 2,840,888 Patented July 1, 1958 encircling the respective end edges of the cover. The cords have overlapping ends which may be knotted if desired. The cord ends overlap at points E, E which are adjacent the

bar tacks

17, 18, respectively. The cords are secured to the roller cover by lock stitches, whip stitches or overcast stitches 23.

In Figs. 2 and 3 are shown details of the internal structure of the cover or sleeve 14. Bar tack 17 is shown disposed perpendicular to seam 15 and overlies the end of the lock stitches 16. The welt cord 20 is embedded in the raw end or edge of the cover and the ends of the cord are crossed, knotted or overlapped at E. The inner and outer sides I and 0, respectively, are shown in Figs. 2 and 3.

In Figs. 4-7 are shown steps in the finishing procedure of the cover. Side I is initially outside and side 0 is inside the cover. Side edges A and A of the felt sheet are shown disposed in a coplanar fashion so that the lock stitches 16 may be sewn through a flat double thickness of the felt. The raw or cut end edges 25 of the felt are exposed as shown in Figs. 4 and 5. The ends 26 of the thread 16 are knotted and then the bar tack 17 is sewn. A similar knotting and bar tacking is shown at the other end of the cover, in Fig. 1, which is not shown in Figs. 47 After the bar tacks are made the thread ends 26 are cut off.

Welt cords

20, 21 are then applied to the raw edges 25 of the cover and whip or lock stitches 23 are made. The ends 25' of cord 20 are shown knotted in Fig. 6. The ends 27 of thread 23 are knotted and the excess thread is cut off. Then ends 25' of

cords

20, 21 are cut off just beyond the knots on overlapped ends of the cords at points E, E which are adjacent the

bar tacks

17, 18. In Fig. 7 the sewing of seam 15 and binding of cord 20 are shown completed and the sleeve or cover 14 is ready to be turned inside out.

Cords

20, 21 are embedded in the raw ends 25 of the cover.

While we have illustrated and described the preferred embodiment of our invention, it is to be understood that we do not limit ourselves to the precise construction herein disclosed and that various changes and modifications may be made within the scope of the invention as defined in the appended claim.

Having thus described our invention, what We claim as new, and desire to secure by United States Letter Patent is:

A lithographic moistening roller, comprising a rigid cylindrical member having axially extending shaft ends, a cover disposed on said member, said cover being a cylindrical sleeve, said sleeve being smooth, taut and wrinklefree and being formed from a moisture-absorbent rectangular sheet, opposite side edges of said sheet being sewn together to form a longitudinal seam in the sleeve, said seam extending substantially the full length of said sleeve, a pair of bar tacks, said tacks respectively terminating opposite ends of said seam, said tacks extending completely through the sleeve from one side to the other, and a pair of Welt cords, said cords respectively being juxtaposed against opposite annular raw end edges of said sleeve, said cords being secured to said annular end edges by continuous lines of stitching.

References Cited in the file of this patent UNITED STATES PATENTS Needlecraft Encyclopedia, published by Good Housekeeping Magazine, 1947, page 73 relied upon.