US1231968A - Means for attaching engraved sheets to cylinders for printing purposes. - Google Patents

Description

A. A K. TALLENT & G. CARLSON. MEANS FOR ATTACHING ENGRAVED SHEETS T0 CYLINDERS FOR PRINTING PURPOSES.

APPLICATION FILED FEB. 7. ma.

1,231,968., I PatentedJul 1917.

2 SHEETS- E I.

A 318. 221mm; IJGKCarZSon liwentvnsr.

Attorney.

A. A. K. TALLENT & G. K. CARLSON. mews FOR ATTACHING ENGRAVED sums TO CYLINDERS FOR PRINTING PURPOSES.

APPLICATION FILED FEB. 7.1916.

1331 ,968? Patented July 3, 1917.

2 SHEETS-SHEET 2.

E%V ENT OF a.

ALEXANDER ALLERTON KILLWORTH TALLEN'I AND GEORGE KARL CARLSON, F LON- DON, ENGLAND, ASSIGNORS TO MESSRS. A. W. PENROSE & COMPANY, LIMITED, OF

.LONDON, ENGLAND.

MEANS FOR AT'IAOI-IING ENGRAVED $I-IEETS TO QYLINDERS FOR PRINTING PURPOSES.

Specification of Letters Patent.

Patented July 3, 1917..

Application filed February 7, 1916. SerialNo. 76,823.

To all whom it may concern:

Be it known that we, ALEXANDER ALLER- TON KILLWORTH TALLENT and GEORGE KARL CARLSON, subjects of the King of Great.

Purposes, of which the following is a speci 'fication.

This invention relates to means for attachlng engraved sheets to cylinders for printing purposes, more especially for rotary intaglio printing.

One object of the invention is to secure a sheet tightly upon a cylinder in such a wayas to preserve a continuous surface which will carry the doctor orink cleaning knife used for intaglio'printing satisfactorily; another object is to prevent ink entering the joint between the ends of the sheet holding device.

Other objects of the invention will appear more fully hereinafter.

The invention consists substantially in the construction, combination, location, and arrangement, all as will be more fully herelnafter set forth, as shown in the accompanying drawings, and finally pointed out in the appended claims.

The accompanying drawings illustrate preferred forms of the invention.

Figure 1 is a sectional view of a printin cylinder employing a separate tongue piece; Fig. 2 shows a side elevation of the cyllnder;

Fig. 3 is a sectional view of a cylinder for ups with a sheet having overlapping ends 0 y; Y

Fig. 4 is a perspective view of a sheet for use with 'a separate tongue piece, a

Fig. 5 shows the joint of a heet for use with a cylinderas shown in Fi 3; and

Fig. 6 shows the end of a sheet flattened out.

The same part is designated 'by the same reference sign Wherever it occurs throughout the several views.

Metal plates or sheets have been secured to cylinders for lithographic printing by forming a-longitudinal recess in the cylinder surface in which the plate fixing mechanism is placed, and in. that class of work the p e of a gap in the cyl nd r is imm terial; in the case of intaglio work however there must be a continuous surface in order to support the doctor and for this reason complete tubes of copper have usually been employed hitherto for the rotary printing of intaglio.

Referring to the drawings A represents a hollow printing cylinder having end walls B and carried by a shaft C. A longitudinal cavity is made in the side' wall of the cylinder which is eventually filled by a long cam-shaped surface G. D is a metal sheet which requires to be held so tightly on the cylinderA as to form a printing surface thereon, for use in intaglio printing employing a doctor. To this end, lips, E, F are formed on the stationary edge of the cylinder A, and upon the movable edge of a cam shaped surface G respectively, and the ends of the sheet D are formed as hooks H, I, which hook over the lips E and F respectively.

J is aspindle having bearings in the end plates B, B and carrying a worm wheel such as K at one, or both ends with which is geared a worm L; attached to the spindle J is the cam surface G which is rotated by the action of the worm L turning the spindle J so as to occupy the position shown dotted in Fig. 1. Clamps M, N, operating by reason of the tapered edges acting in the tapered recesses 0,]? force one edge tightly against the hooked ends of the sheetD and secure them against the lips E and F.

When the cam surface G is in the dotted po sition this is readily done with the end I while the end H covers the lip E. Upon returning the cam surface Gby means of the worm Lto its normal position as part of the periphery of the cylinder, the sheet D is tightly stretched around the cylinder A. The action of the worm L is self-locking, and as the leverage when nearing the readily fixed in place, and the opening leaves.

the way clear for a spanner or other tools to operate the screw of clamp M. Spaces are left in the end walls B, B of the cylinder A for the passage of a planing tool during manufacture, and in the case where a loose v the clamp plates.

- for securing them in place.

tongue piece Q is employed, brackets R are fixed to the end walls by screws T, and are It will be seen on reference to Fig, 4

'(shown with the joint opened) that when the separate tongue piece Q is used, both ends of the sheet D are provided with holes U on the bend of the hook, the edge beyond the holes being retained a continuous form as shown in-Fig. 6, where the plate is shown flattened out. The tongues and recesses may be of any convenient shape.

In the modification shown in Fig. 5, holes U are made in one end of the sheet only, cuts being made in the other end so as to produce tongues which pass over the joint while the spaces from'which they come pass around the surface of the lip F. Both ends will still be-formed with a continuous edge as shown in Fig. 6; this is stronger than open ends, and permits of a tighter hold by The clamp plates may conveniently be formed with the inside edge secured as a hinge, and preferabl .will have a spring to keep them open unt1l the sheet is in place. I

The rigid edge of the cylinder may be. formed'as-a detachable portion of the cy1in der surface, but preferably the -li will be thereto.

integral with the surface, and a 0 amp willsecurely hold the sheet thereto The general direction of the joint may be parallel to the axis of thecylinder, though 1t may in certain cases be placed at an angle It is obvious that many changes and variatlonsin the details of construction and arrangement would readily suggest themselvesd,

within the spirit andscope of our invention. Whlle therefore, we have shown and descrlbed varlous specific constructions and arrangements as operative embodiments of the princlples of our invention, we do not desireto be limited or restricted thereto but .Having now set forth the object and naure of our rnvention and forms of apparatus" embodying the same and having ex 'plained its construction, function, and mode I of operation, what we claim as new and useful and of our own invention, and desire to secure by LettersPatent,is:-

1. A printlng cg'li dercomprising a hollow drum prov1de withia lon 'tudinally extending cavity in its side wal a rigid edge on one sideof the said. cavityfa. movable 5 plate supporting member pivoted on the end 6 wallsso'asto occupy 'thesaid cavity and normally"forming part of the cylindrical surface, and means for moving the said mov-' able member radially outward out of conformity with the cylindrical drum surface while retaining its position longitudinally, a flexible printing plate encircling the cylinder, and inter-engaging means provided with tongues and recesses for removably securing the longitudinal ends of the said plate'together so that a bearing surface continuously level is obtained when the sheet is strained by inward rotation of the pivoted cam surface into conformity withthe cylindrical drum surface.

2. A printing cylinder comprisinga hollow drum provided with a longitudinally extending cavity in its side wall, a rigid edge on one side of. said cavity, a cam surface forming normally a part ofthe cylinder.sur

. face pivoted in theend walls of the cylinder strained by rotation of the pivoted cam surfaceinto ts normal position.

3. A printing cylinder comprising a-hollow drum provided with a longitudinally extending cavity in its sidewa l, a I rigid lip on one side of said cavity, a cam surface forming normally a part of the cylinder surface pivoted in the end walls of the cylinder-so as to occupy the saidcavity and form,-'

'ing a movable lip adjoining the rigid lip, a'

covering sheet encircling \said drum, 2.

hooked end on the covering sheet ,engaging the rigid lip of thecylindrical cavity,"a hooked end on the coveringsheet engaging the movable lip ofthe cam surface, and a series of tongues and recesses on the cover ing sheet inter-engaging acrossthe adjoining hooked ends thereo c I v 4. A printing cylinder com rising a ho low drum provided with, a ongitudinally extending cavity in its sidewall, a rigid lip on one side of said cavit a cam surface forming normally a part 0 the cylinder surface pivoted in the end walls of the cylin-.

der so as to' occup 'the said cavity and formlng a movable in adjoining the rigidlip, a coveringsheet encircling said drum,-

a hooked end in the covering sheet engaging the l'lgld lip -of the cylindrical cavity, a hooked end on the covering sheet engaging the movable lip ofthe' cam surface, means for securing the hooked ends to the rigid lip and-the cam surface lip respectively, and

a series of tongues and recesses on the coveringsheet inter-engaging across the adjoining hooked ends thereof. s

5. In a printing cylinder for carrying flexible sheets for intaglio printing, a cylinder havlng a small longitudinal cavity, in combination with a flexible sheet, the ends of which project within the said cavity, and are provlded exteriorly thereof with a series of spaces or recesses cut from the sheet,

means for fixing the ends of the sheet in the cavity, a separate tongue piece supported in the cavity, and tongues projecting therefromion both sides inter-engaging the sheet spaces with a common surface level, substantially as described.

6. In a device of the character described,

a cylinder, a flexible sheet, a cam surface pivoted within the periphery of the cylinder and normally forming part of the cylinder surface, a Worm wheel 'orl wheels thereon engaging a wormor worms carried upon the cylinder ends, a lip formed upon a rigid level inter-engaging means connecting theadjoining' ends of the said sheet when stretched by rotation of the pivoted cam surfacellip to meet the rigid lip.

7- In a device of the character described,

a cylinder, a flexible sheet, a cam surface, pivoted Within the periphery of the cylin-' der and normally forming part of the cylindersurface, a worm wheel or worm wheels thereon engaging a worm or worms carried upon the cylinder ends, a lip formed upon a rigid part of the cylinder, ahooked end on the flexible sheet engaging the said lip and provided adjoining but exteriorly there of with a series of spaces cut from the sheet, a second lip formed upon the pivoted cam surface, a hooked end formed on the flexible sheet engaging this second lip and provided adjoining but exteriorly thereof with a series of spaces cut from the sheet, means for securing the hooked ends to their respective lips, .a separate tongue piece supported in the cavity, and tongues projecting therefrom on both sides inter-engaging the sheet spaces with a common surface level, substantially as described.

8. In a device of the character described, a cylinder, a flexible sheet, a cam surface pivoted. within the periphery of the cylinder and normally forming part of the cylinder surface, a worm wheel or worm wheels thereon engaging a worm or worms carried upon the cylinder ends, a lip formed upon the rigid part of the cylinder, a hooked end on the flexible sheet engaging the said lip and provided adjoining but exteriorly thereof with a series of spaces cut from the sheet, a second lip formed upon the pivoted cam surface, a hooked end formed on theflexible sheet engaging this second lip and provided adjoining but exteriorly thereof with a series of spaces cut from the sheet, wedge strips and screws for securing the hooked ends to their respective lips, a separate tongue-piece, tongues projecting therefrom so as to inter-engage the sheet spaces at a common surface level, and brackets for supporting the tongue piece attached to the cylinder ends having screws for securing the tongue piece therein.

Signed at London, England, this 15th day of January'A; D. 1916.

ALEXANDER ALLERTON KILLWORTH TALLEN'I'.

eraser KARL GARLSON;

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