US1971081A - Inking mechanism for printing machines - Google Patents

Description

s. NEWTON ET AL 1,971,081

INKING MECHANISM FOR PRINTING MACHINES Aug. 21, 1934.

Filed Oct. 10, 1931 fizz/6125013.

Patented Aug. 21, 1934 ATEN OFFICE,

MACHINES INKING MECHANISM FOR PRINTING Sam Newton, Altrincham, and Fred Spence, Sale, England, assignors to Linotype and Machinery Limited, London, England, a limited-liability company of Great Britain Application October. 10, 1931, Serial No. 567,998

In Great Britain October 16, 1930 4 Claims. (01. 101-V356) This invention relates to inking mechanism of printing machines, particularly machines in which a flat bed is reciprocated beneath the forme cylinder and forme inking rollers, which latter rotate in respectively opposite directions with reversal of travel of the bed. 1

More particularly the invention relates to mechanism in which two sets of rollers are employed, of which one. set serves to work up the ink intermittently fed thereto from the ink fountain, and the other set applies the ink to the forme, means intermediate the two sets being provided for elfecting the transfer of ink from one set to the other.

In mechanism of this kind, as usually constructed and operated, the full supply of ink for each impression is delivered in a continuous film to the forme rollers from the distributor rollers during one stroke of the bed, because the reversal in the direction of rotation of the forme rollers prevents any transfer of ink to them during the time that the mutually contacting surfaces of the respective sets of rollers are moving iii-opposite directions.

According to the. invention, a more efficient distribution of the ink to the forme. rollers and greater uniformity in the film of ink applied by said rollers to the printing surface, are secured by animprov'ed method of operation in which ink is actually transferred from the distributor rollers to the forme rollers during the periods of uniform travel of the bed in both directions,

so that one half of the full supply of ink for one impression is delivered to the forme rollers during each stroke of the bed.

In one constructional form of apparatus for carrying out the invention, ink is delivered to the distributor rollers from the ink fountain by a swinging ductor roller, is subsequently transferred to a distributor drum located between the distributor rollers and the forme rollers, and is thereafter transferred from the distributor drum to the forme rollers at two distinct stages. This result is attained by the use of a ductor roller in constant rolling contact with the distributor drum, and alternately brought into contact with two rollers of the forme roller set. The distributor drum may conveniently be of a circumference approximately equal to the length of the forme.

In another constructional form of the invention, the distributor drum is rotated in continuous contact with the distributor rollers.

The invention will now be more particularly described by reference to the accompanying diagrammatic drawing, in which:

Figures 1 and 2 are elevations representing respectively the above-mentioned two constructional forms of the invention; Y i

In the constructional arrangement, illustrated in Figure 1, the before-mentioned two sets of rollers are identified by the reference letters A, B, of which A is the set which serves to work up the ink intermittently conveyed to it from the ink fountain 1,and B is, the set which applies the ink to the forme on the bed 2.

The ink is conveyedto the set A from the ink fountainroller 3 by means of a swinging ductor roller 4 which alternately contacts with said fountain roller 3 and the roller 5. roller 5 is the first of the set A, which also comprises, the last roller 6, and, a rider roller 7 contacting with both 5 and 6, j Obviously, the set A may comprise more rollers than are here represented. V v

The ink, well Worked up by thev rollers 5, 6 and 7, is transferred to the distributor drum 8 (whose circumference may conveniently be approximately equalto the length of the forme), by a swinging ductor roller 9 which, while making only intermittent contact with the drum 8, is in constant rolling contact with the so-called last roller 6 and thereby largely assists in. the working up ofthe ink by the set A. V

The actual transference of ink to the drum 8 takes place during a period which includes the reversal of the bed at one or each end of the stroke, and at times at which the forme roller set B, is out of operative contact with the set A.

The forme roller set B, in the example under review, comprises four forme rollers 10, 11, 12 and 13 arranged in two pairs 10, 11 and 12, 13, each pair surmounted by its respective vibrator roller 14, 15, which latter are both placed in operative rolling contact through mutually contacting intermediate rider rollers 16, 17 and 18.

The transference of ink from the drum 8, to the set B is efiected in twodistinct stages. This result is attained by the use of a ductor roller 20 which is in permanent rolling contact with the drum 8, and arranged to make contact alternately with the rollers 14, 16.

The ductor roller 20 is journalled in arms 22 (one at each side of the machine) which are free to be swung about the axis of the drum 8, and this swinging movement is so timed and controlled that during one uniform travel of the bed in the direction of the arrow a, the ductor roller 20 is in rolling contact with the roller 14, as indicated in full lines in Figure 1,

This w In the alternative constructional form ot the invention illustrated in Figure 2, a more efiici'en-t distribution of the ink to the forme roller set B, is ensured by the distributor drum 8 being rotated in continuous contact with;vthedistributor roller set A. This arrangement is shown. in Figure 2 in conjunction with a forme inking set B arranged as in Figure" 12' p According to this last-mentionedarrangement, the ink intermittently fed to the distributor. roller set A from the ink fountain 1 by the ductor roller 4 is continuously worked up: by thedistributor rollers, thedistributondrurm 3 and the transfer roller 20 and uniformity of the film of ink transferred to the' forme roller set B is more eflicientlymai'ntained than is possible where the distributor drum it receives inkonly intermittently from the'd-ist'ributor rollers.

It is to be noted that both the arran'gementsabovedescribed the transfer of ink tothe forme' rollers occupies only short periods of.

the distributor rollers can be satisfactorily:

Having'd'escribed our invention; We declare that what we claim and desire w secure-by- Iietters- Patent is-:

tributor rollers rotating always in the same direction, aset' of forme inking rollers rotating alternately opposite directions; an ink dis-- tributor drum rotatinga'lway's in; the-same di-' recti'on'and' adapted toreceive irrk from the ink distributor rollers and transfer'iirk' to the forme inking rollers, and a' ductor roller constant Is i I I nation during the rotation of said forme inking roller set in respectively opposite directions.

2. In inking mechanism for printing machines, the combinationota set of ink distributor rollers rotating alwaysin' the same direction, a set of forme inking rollers rotating alternately in opposite directions, an ink distributor drum rotating always in the same direction and adapted set being so located that the ductor roller makes contact with them-.inalternation during the rotatiorr-of saidvtorrne inking roller set in respectively-opposite directions, said ductor roller at an intermediate stage being maintained out of contact with the forme inking roller set.

3..-I n..inking mechanism for printing machines, the combination of a set of ink distributor, rollers rotating" always inthe same direction, a set of forms inkingrollers rotating alternately in op*-- positedirections, an ink distributor drum interm'ediate-theset of ink distributor rollers and the set of formeinking rollers rotating always in the same direction, a; ductor rollers intermittent-' 1y contacting with the-drumto transfer ink thereto 'fromthe ink distributor rollers, and a7 ductor roller in constant rolling" contact with the drum, two rollers of the forme inking set beingfso locatedthat the last-named ductor rcllermakescontact with one or" other of them conforniably with their directions ofrota'ti'on. l. In inking mechanism forprinting machine's, thecombination of aset of ink distributor rollers rotating always-in the same direction, a setof v e I forme inkingro'llers rotating alternately in op'- '11- Ininking mechanism for" printingma chines, the combination of a set of i-nk' d-isp'osite directions; an ink distributor drum inter mediatethe set' ofink distributor" rollers and the set ofiormeinking roll'ers' rotatingalways inthe same; direction" and in constant rolling" contact with one'i ol'ler of the distributor" roller set, andaductor roller" in constant rolling. con.- tact with the drum, two rollers of the ferrite inking setbeingso" located that" the ductor roller. makes "contact with one 'or other. "or" them conformably' with their directions of rotation;

' SAM NEWTON.

' FRED'SPENCE."

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