US2088808A

US2088808A - Two-revolution cylinder printing press

Info

Publication number: US2088808A
Application number: US59052A
Authority: US
Inventors: Pearsall Albert Edward
Original assignee: Individual
Current assignee: Individual
Priority date: 1936-01-14
Filing date: 1936-01-14
Publication date: 1937-08-03
Anticipated expiration: 1954-08-03

Description

v Aug. 3, 1937; A. E. PEARSALL TWO-REVOLUTION CYLINDER PRINTING PRESS Original Filed Jan 14, 1936 2 Sheets-Shee' 1 /NvE/v ron ALBERT 'EzrwAR'a PEARSALL BY Wifi@ Aug. 3, 1937. A. E. PEARSALL TWO-REVOLUTION CYLINDER PRINTING PRESSV 2 Sheets-Sheet 2 5 4 6 7 i .(.l w am Am Il N 5 n?. 5 l 3 l I I m Q\. A M .M \\m A I l I I l I I l l l I I l I l l l l l I I m l\ \3 w m 1 m w f HM \l 3 uw dj@ Q w HH. ,HMHAQ 7., i H... www?? l IH., iwf@ ,z e VW W 5 3 mm m QL ,L

ATTORNEY Patented Aug. 3, 1937 PATENT OFFICE TWO-REVOLUTION CYLINDER PRINTING PRESS i Albert Edward Pearsall, Vancouver, British Cou lumbia, Canada Application January 14, 1936, Serial No. 59,052 Renewed June 16, 1937 4 Claims.

My invention relates to improvements in tworevolution cylinder printing presses, the objects of which are to providemeans whereby multiple .colour p-rinting can be done on said presses at 5` a single operation, whereby the registration of the several colours is assured on all printing done and whereby great economy of equipment and time is obtained.

` 1 The present method doing multiple colour work on presses cf the single cylinder and reciprocating bed type is to print a run of one colour and subsequently to put the printed sheets through the press a second and third time, giving successive impressions of diiferent colours. The major f difculty in such a case lies in the accurate registration of the paper in successive runs through the press.

The present invention contemplates the use of one or more form cylinders timed with the bed and the impression cylinder so that as a sheet of paper is printed by the form on the bed it is passed between the form cylinders and the-impression cylinder to receive further imprints, as will be more fully described in the following specification and shown in the accompanying drawings, in

which:-

Fig. 1 is a side elevation of the invention applied to the frame of a two revolution cylinder press.

Fig. 2 is a plan View of same.

In the drawings like characters of reference indicate corresponding parts in each figure.

The numerals I and 2 indicate side frame members of a press, between which a bed 3 is slidably movable. The numeral 4 indicates the impression cylinder which is journalled at opposite ends in eccentrics 5. i The eccentrics 5 are each provided with an arm 3 which is connected through a connecting rod I `d10 to a crank 8 secured upon a shaft 9.

. The parts thus far described are usual parts in the standard two revolution cylinder press and are operated from' the regular drive of the press.

The cranks 8 on being rocked in a downward 45 direction rock the eccentrics 5 and move the impression` cylinder 4, which `has picked up a sheet of paper, in a downward direction until the paper is brought into contact with the form, not shown, upon the bed 3. After impression and during 50 the second revolution of the impression cylinder the cranks 8 are raised and the cylinder is in consequence held out of contact with the bed. This operation is regularly carried out in presses of the two revolution cylinder type and is therefore 55 deemed to require no further description.

(Cl. lOl- 173) Pivotally mounted upon the side frame members I and 2 is a form cylinder assembly generally indicated by the numeral I0, which consists of a pair of brackets II which are rockingly mounted upon pins I2 extending from the frame members. Each of the brackets II is provided with a rear abutment I3 and a front extension I4, the front extension I 4 being engaged by a horizontally disposed spring I5 carried by a frame member and also by a vertical spring I3 carried from the frame member by a step Il. Each bracket II includes a bearing I8 for a form cylinder I9 and slotted bearings 20 and 2l for

ink rollers

22 and 23 respectively. The bearings 2I are provided with a suitable keeper 24 for holding the shaft 25 of the ink rollers 23 against displacement.

To each of the brackets. II similar brackets 26 are pivotally connected as at 2l. These brackets form part of another form cylinder assembly generally indicated by the. numeral IA which includes a form cylinder I9, slotted bearings 2IJ and 2I and

ink rollers

22 and 23. The brackets 26 are similarly provided with a rear abutment I3 and a front extension I4 which latter is engaged by springs I5 and I6 in an exactly similar manner to the elements of the brackets. I I.

The free end of each of the eccentric arms 6 is provided with a cam plate 28 adapted to engage a swinging lever 29 which is journalled from the side frame members I or 2. This swinging lever is provided with a pair of projections 39 which engage a roller 3| projecting inwardly from each of the abutments i3 of the brackets II and 29, so that as the eccentric arms 3 are swung upwardly to raise the impression cylinder l ofi impression the form cylinders I9 and their

ink rollers

22 and 23 are moved away from the impression cylinder, converselyas the eccentric arms are lowered and the impression cylinder 4 is lowered into impression position upon the bed the form cylinders are moved by the springs I5 and `I6 into printing Contact with the paper upon the impression cylinder.

The impression cylinder ii is fitted upon a shaft 32 having a gear 33 driven from the main drive of the. press, not shown. The shaft 32 is tted with a drive gear 34 which meshes with a gear 35 secured to each of the shafts 3B of the form cylinders I9 to drive them at the same peripheral speed as the impression cylinder 4.

The ink rollers 22 are driven by gears 31 tted to the end of each of the form cylinders I9 which gears mesh with gears 38 tted to the shafts` 39 of the ink rollers.

The gear wheels 35 are tted on their inner side with a cam which engages and rocksV an arm V4I mounted upon a suitable supporting member, this arm being forked at its forward end to engage a slotted collar 42 secured to the shaft 43 of the ink roller 23. A spring 44 is interposed on each shaft 43 between the bracket II and the adjacent end of the ink roller 23 for the purpose of urging said ink roller axially in one direction and the cam 40 serves through the arm 4I to move said roller in the opposite direction.

Suitably supported between the frame members I `and 2 are inking fountain assemblies 45, one to each form cylinder assembly. Each assembly consists of a fountain 46 ofV the usual type with a fountain roller 41. Between the roller 41 and the inkV roller 23 is a'ductor roller 48. The ductor rollers 48 are mounted uponY shafts 49 and are carried in forked arms 50 which are pivotally mounted upon the frame members I and 2. These arms are mounted upon a transverse shaft 5I to which is secured a lever 52, the free end of Vthe lever is engaged by a cam 53 formed upon the lower end of the crank 8, so that as the crank 8 is rocked to bring the impression cylinder onto impression position the arms/ 50 Vare swung to bring the ductor roller 48 into inking contact with the roller 23.

The forked arms 50 are spring tensioned as at 54 to move them and the ductor rollers towards the ink fountains. 46. The fountain rollers 41 are each fitted with a ratchet wheel 55 which is adapted to be engaged by a pawl 56, so that each time the ductor rollers move towards' their respective fountain rollers 41 the latter are turned about their axes to receive a further supply of ink.

In operation, forms for the first colour are secured to the bed 3 of the press, forms for the second colour are secured in proper registration on the lower form cylinder I9 and forms for the third colour, if three colour printing is tobe done, is secured to the upper form cylinder I9. When the forms are in registration and the ink fountains supplied with ink of the desired colour, the press is set in motion and is fed with sheets of papers in the usual way. Each sheet on being gripped and carried around upon the surface of the impression cylinder 4 is first brought into impression upon the forms on the bed 3 as the bed moves to the right, see Figure 1, or to the front of the press, it then passes into impression on the forms of each of the lower and upper form cylinders I 9. As the bed is about to return, the eccentric arms 6 are raised to take the form cylinder ofi impression and simultaneously the swinging levers 29 are thrust forwardly by the cam plate 28, thus swinging the vform roller assemblies I0 and I 0A away from the impression cylinder 4 and the ductor rollers 48 are drawn out of contact with the rollers 23 and moved into contact with the fountain rollers 41. During the time that the impression cylinder 4 takes its second revolution it discharges the printed sheet and picks up an unprinted one. Y v What I claim as my invention is:

1. The combination with a two revolution impression cylinder press having frame members, an impression cylinder mounted in eccentrics whereby the movement of the eccentrics moves the l being adapted for coordinate movement into and out of printing engagement with the impression v.cylinder with the rst mentioned form cylinder. e 2. The combination with a two revolution impression cylinder press having frame members, an impression cylinder mounted in eccentrics wherebythe movement of the eccentrics moves the impression cylinder towards or away from a reciprocating bed, a pair of brackets swingingly mounted on the frame members, a form cylinder journalled in said brackets, means for swinging the brackets to move the form cylinder into printing engagement With the impression cylinder, and means operated in response to the eccentric movement 4for rocking the brackets and the form cylinder away from the impression cylinder, an ink roller carried by said brackets adapted to contact the form upon the form cylinder, a stationary ink fountain and a ductor roller adapted to transfer ink from the fountain to the ink roller as the brackets and the form cylinder are rocked away from the impression cylinder.

3. The combination with a two revolution impression cylinder press having frame members, an impression cylinder mounted in eccentrics for movement towards and away from a reciprocating bed as the eccentrics are rocked, a form cylinder rockingly mounted in brackets parallel to the impression cylinder, a cam plate associated with the eccentrics, a swinging arm adapted to be actuated bythe cam plate to rock the brackets and move the form cylinder away from the impression cylinder in timed relation with the movement of the impression cylinder towards and away from the bed, spring means for moving the form cylinder towards the impression cylinder and means for applying ink to the form cylinder. I 4. The combination with a two revolution impression cylinder press having frame members,l

an impression cylinder mounted in eccentrics whereby the movement of the eccentrics moves the impression cylinder towards or away from a reciprocating bed, a pair of brackets swingingly mounted on the frame members, a form cylinder journalled in said brackets, means for swinging