US1281003A

US1281003A - Lithographic damping-roller.

Info

Publication number: US1281003A
Application number: US6403315A
Authority: US
Inventors: Carl Henderson
Original assignee: Individual
Current assignee: Miehle Printing Press and Manufacturing Co
Priority date: 1915-11-29
Filing date: 1915-11-29
Publication date: 1918-10-08
Anticipated expiration: 1935-10-08

Description

c. HENDERSON.

LITHOGRAPHIC DAMPING ROLLER.

APPLICATION FILED NOV. 29. I915.

Patented Oct. 8,

i I 506E501 drawings,

UNITED STATES PATENT OFFICE.

CARL HENDERSON, 01 OAK PARK, ILLINOIS, ASSIGNOR T0 MIEHLE PRINTING PRESS & MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

LITHOGRAPHIC DAMPING-ROLLER.

Specification of Letters Patent.

Patented Oct. 8, 1918.

To all whom it may concern:

Be it known that I, CARL Hnnnnnson, a citizen of the United States, residin at Oak Park, in the county of Cook and tate of Illinois, have invented certain new and useful Improvements in Lithographic Damping-Rollers, of which the following is a specification. y

In connection with lithographic printing presses, damping rollers are. used and it has been .usual to employ for this purpose a mandrel of metal or other non-yielding substance with a cylindrical covering of felt or other similar absorbent fabric by which the wateris taken up and transferred. It is necessary that the surface speed of the roller shall correspond to that of the coacting cylinder and it is not uncommon for the fabric covering of the rollers to creep .in spots, due to slight differences in surface speed, and thusform local protuberances or wrinkles which prevent perfect operation.

As it is exceedingly diflicult if not prac-.

tically impossible to secure and maintain absolute uniformity of surface speed, I have avoided the difficulties above pointed out by designing an absorbent covering for the damping roller which provides for the nec essary slippage and maintains a smooth surface at all times.

Inorder that the invention may be readily understood, preferred and modified embodiments of the same are set forth in the accompanlying drawings. and in the following detai ed description based thereon. It w' 1 be obvious, however, that the invention may be embod ed in other varied and constructional forms, wherefore it is to be understood thatfthe drawingand description are to be taken in an illustrative and not .in an unnecessarily limiting sense. .In these Figure 1 is a diagrammatic view illustrating the damping mechanism of a press of the lithographic type; I

- Fig. 2' is a sideelevation of the dampg roller showing one end inlon'gitudinal section; I

Figs.- 3 and 4 arerespectively; sectional and elevational views-of an absorbent disk forming one of the component parts of the rollers;

' I f Figs. 5 and 6 are similar views of a spacing metal disk or ring forming one of the component parts of the roller; and

a modification.

In Fig. 1 of the drawing is shown in a diagrammatic manner the water trough 11, the water roller 12, the ductor roll 13, the distributing roll 14, and the damping roller 15 arranged in a train in the usual manner to act upon the blanket cylinder 0 of a press. It :is with the formation of the damping rollers 15 that the present invention has to do.

The dampening roller comprises a mandrel 16 having arranged thereon a series of yielding. absorbent disks 17 of felt or other similar material suitable for the purpose. Between the adjacent absorbent disks 17 and alternating therewith is arranged a series of hard, firm non-absorbent disks 18 of slightly less exterior diameter than the absorbent disk 17. The

disks

17 and 18 are in the form of .rings having an, interior diameter corresponding to that ofthe exterior diameter of the mandrel 16 so that they can be readily slipped upon the mandrel and will turn thereon. At each end of the, mandrel 16.are threaded nuts 19 by meansof which the series of disks maybe clamped axially together while permitting of angular slippage on the mandrel. The ease of slippage will be controlled by the 5. Fig. 7 is a fragmentary sectional view of degree to which the nuts 19 are pressed against the series of disks.

It will be observed that by reason of the difference in exterior diameterof the

disks

17 and 18, the former will project peripherally beyond the latter, and when axial pressure is applied by means of the nuts 19 that portion of the disk 17 between the firm spacing disk 18 will be so far compressed "that the peripheral portions of the disk 17 will meet over the outer edges of the disks 18 and thereby bridge the space between each of the adjacent absorbent disks 17 and producev an unbroken absorbent periphery for'the roller. This is clearly illustrated in the right hand, end of Fig. 2 of the draw ing. The extreme terminal spacing disk 18 1 of the series, adjacent the nut 19, act as, anti-friction members or washers permit-i ing of the angular slippage of the entire 0? senes of disks upon the mandrel independ-" shown embody the important advantageous ently of the nuts 19., It will be clear, how- .1111g817l1616011, a series of ever, that Where theprovis'ion'of slippage is not' desired, the nut 19 may be screwed home upon the series of disks sufliciently to prevent any angular slippage.

In Fig. 7 is shown a slight modification,

the essential difference being that upon the mandrel 16 is arranged a sleeve 20 in such manner as to provide for angular. slippage thereon, the

rings

17 and 18 being mounted upon this sleeve, and clamps thereon by means of the-nut 21. The disks l7 and 18' would be clamped by means of the nut 21 upon the sleeves 20 with suflicient degree of pressure to prevent angular slippage upon the sleeve; .the requisite slippage upon t e mandrel being between the sleeve 20 and the mandrel 16, the disks would be indirectly under the control of the adjusting nut 19, as in the former case. However, the degree of pressure exerted by the nut 19 to control slippage would been;

tirely independent of the axial compression exerted upon the

disks

17 and 18 by the end clamp or nut 21. I 4

It will be noted that the two constructions feature that the moisture in the roll is confined substantially to the periphery thereof,

the central portion being tightly compressed between the spacing disk While the peripheral portion is comparatively free from compresslon. Moreover, the roller is wlthout seam and is thus perfectly true and remains true in use. A further advantage is the fact that by reason of the provision for slippage the damping rollers may be posi-' tively driven instead of by friction only; I claim:

1. In a device of the character described a roll comprising a mandrel, a series ofv L yielding absorbent rings rotatably. mounted on the mandrel, and-means to I clamp the series of rings together axially of the man- 2. In a device of the character described,

a roll comprising a mandrel, a series of yielding absorbent rings and of inter osed relatively unyielding spacing rings 0 less diameter rotatably-mounted on the mandrel, and meansto clamp the series of rings together axially of the mandrel.

3. In a device of the-character described, a roll comprising a mandrel, a series of yielding absorbent rings and of interposed relatively unyielding spacing rings'of less diameter rotatively mounted on the mandrel, and

means to clamp the series of ringstogether' axially of the mandrel and to regulate the ease'of rotation or angular slippage on the mandrel. I

4. In a damping roller, the combination of a mandrel, a series of yielding absorbent sp c rings of but slightly less diameter arranged between adjacent yielding "rings, and nuts r a threaded on the ends of the mandrel to clamp the series of firm and yielding rings together axially of the mandrel,,whereby to isolate the absorbent rings except atj'their edges and to cause the rejecting peripheries of the adjacent yi'e ding ring to meet to form an unbroken absorbent peripheral surface, the clamping action ofthe nuts be ing limited" to anextent to permit of angue (liar 1slippage of the rings relative to the manre of a mandrel, a series of yielding absorbent rings rotatable thereon, a series of 'firm spacing rings of lessdiameter arranged bei 5. In a" dampiiig roller, the combination beyond the peripheries of the spacing rings tween adjacent yielding rings, and nuts threaded on the ends of the mandrel to clamp the series of firm and yielding rings cause the projecting peripheries of the adjatogether axially ofthe mandrel, whereby to cent yielding rings to meet beyond the 6. In a damping roller,-the-combination of ama'ndrel, a sleeve rotatable thereon, a series of yielding absorbent rings on the sleeve,"a series offirm spacing rings of less diameter arranged between ,the adjacent yieldingrings upon the sleeve, a nut threaded on the end'of thes'leeve to clamp the series of firm andyielding rings together axially thereof, and a nut threaded, on the mandreland engaging the end of the sleeve tocontrol the angular slippage of the sleeve on the mandrel. I

7. In a damping roller, the combination of a mandrel, a s eeve rotatable thereon, a

. series of -yielding absorbent rings on the sleeve, a series of firm spacing rings of less diameter arranged between the adjacent yielding rings upon the sleeve, a nut threaded on the 'endof the sleeve to clamp the series. of firm and yielding rings together axially thereof, and a nut threaded on the mandrel and engaging theend of-the sleeve to control the angular slippage-of the sleeve on the mandrel, the clamping-action of the two nuts being independentone of the other. In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses. 1

' Y CARL HENDlEllRSON. Witnesses: r I O. I. MANSUR C. D. GIBBS.