US1069139A - Printing-press. - Google Patents

Description

R. T. JOHNSTON.

PRINTING PRESS. APPLICATION PILBD DEG 18, 1911.

Patented Aug. 5, 1913.

3 SHEETS-SHEET 1.

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R. T. JOHNSTON. PRINTING PRESS. APPLIOATION FILED 10110.18. 1911.

Patented Aug. 5,1913.

3 SHEETS-SHEET 2.

0.. WASHINGTON D c R. T. JOHNSTON.

PRINTING PRESS. APPLICATION FILED "DEC. 18, 1911.

Patented Aug. 5, 1913.

3 HEETSSHEET 3f 65%. mm M m mw IHFIIIW! ROBERT TAYLOR JOHNSTON, 0F SCOTCH PLAINS, NEW JERSEY.

PRINTING-PRESS.

To all whom it may concern Be it known that 1, ROBERT TAYLOR JoI-Iwsrow, a citizen of the United States, residing at Scotch Plains, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Printing-Presses, of which the following is a specification.

This invention relates to printing presses of the bed and cylinder type and aims in general toward improvements in the construction, operation and efficiency of this type of presses and more particularly toward the provision of novel inking mechanism and means for operating the same.

One of the objects of the invention is to provide individual inking mechanisms each adapted to ink a portion only of the printing form and to mount these mechanisms bot-h on the same side of the printing cylinder in such a manner that the inking operations may be performed with a shorter stroke of the form bed than has heretofore been possible with inking mechanisms mounted on one side of the cylinder.

Another object of the invention is to provide new and improved means for raising and lowering the inking rolls of the individual inking mechanisms in succession at predetermined position of the printing bed, and for retaining each roll in contact with its particular portion of the printing form throughout the entire length thereof and for preventing the rolls from contacting with the other portion of the form.

A. further object of the invention is the provision of adjusting means carried by the form bed whereby the roll raising and lowering mechanisms may be regulated to time the roll movements in conformity with the size and character of the particular printing form being used.

Additional objects and many of the advantages of the invention will be apparent to those skilled in the art, as the invention becomes better understood from the following description when considered in connection with the accompanying drawings throughout the various views of which like reference characters refer to similar parts.

On the drawings-Figure 1 is a fragmentary side elevation of a printing press embodying one form of my invention. Fig. 2 is a plan view thereof, certain portions of the machine being removed to more clearly disclose the parts located thereunder. Fig.

Specification of Letters Patent.

Application filed December 18, 1911.

Patented Aug. 5,1913.

Serial No. 666,354.

3 is a longitudinal sectional view on the line 3-3 of Fig. 4.. Fig. 4 is a transverse sectional view taken on the line H of Fig. 1; and Fig. 5 is a fragmentary detail view showing one of the reciprocatory plates in section and the mechanism for operating the same.

From the drawings it will be observed that upon the main supporting frame 6 of the machine is mounted the impression cylinder 7 and the reciprocatory form bed 8, the impression cylinder and bed being rotated and reciprocated respectively in the usual manner by any preferred driving mechanism (not shown). The reciprocatory bed carries the printing form which, in accordance with the requirements of the work done on machines of this character is divided by a central margin 9 into a head portion 11 and a tail portion 12, respectively. The individual portions of the printing form may be of any preferred construction although customarily they are made up of a number of individual sections each provided with suitable printing characters or surfaces.

In order to reduce the length of stroke of the bed, thereby reducing the size of the impression cylinder and other machine parts and increasing the output of the machine 1 mount and operate the inking rolls in such a manner that the entire form is completely and uniformly inked without passing the full length of the form under all the inking rolls as has been customary heretofore in the operation of machines in which the inking rolls are all located at one side of the cylinder. To this end I have divided the inking rolls into sets each adapted to ink a port-ion of the form, the set 13 nearest the impression cylinder, and hereafter referred to as the head mechanism, being designed to ink the head portion 11 of the form and the other set 14 more remote from the impression cylinder and hereafter referred to as the tail mechanism being adapted toink the tail portion 12 of the form. The head mechanism comprises the inking rolls 15 and 16 normally contacting with the distributing roll 17 which is driven from the rack 18, carried by the form bed, through the intermediary of a gear 19. The tail mechanism comprises the inking rolls 22 normally contacting with the distributing roll 23 which,

in turn, is also rotated from the rack 18' through the intermediary of the gear wheel 24. The distributing rolls 17 and 23 are gin 9 through the shafts 37 which are oscillated by their respective followers 46 as the risers 32 engage therewith. IVhen the bed has traveled a sufficientdistance to pass the head portion of the form entirely under both rolls 15 and 16, reversal of the bed takes place. It will thus be obvious that the travel of the bed is materially reduced over the travel in those machines so constructed that the entire printing form must be passed under all of the inking rolls of the entire inking mechanism. Upon reversal of the bed the rolls of the head mechanism are successively raised as the head portion of the form travels out from under them and the rolls of the tail mechanism are successively lowered into engagement with the tail portion as the head portion is withdrawn from under them. Thus it will be seen that the individual inking rolls of both the head and tail inking mechanisms are successively raised and lowered as the bed reciprocates to maintain contact between the rolls and their respective portions of the form and prevent contact with the other portion of the form.

Since the position of the head line of all forms employed remains fixed relatively to a predetermined point on the periphery of the impression cylinder, it will be manifest that the position of the central margin 9 will necessarily vary in forms of different sizes. In order that the cam members may be simultaneously adjusted on the bed to correspond with the position of the central margin and thereby insure the proper timing of the raising and lowering movements of the inking rolls, I have provided a cross adjusting shaft 57 mounted on the bed of the machine and provided at its ends with gear wheels 58 and 59, meshing with racks 61 and 62 respectively formed on the cam members 25 and 26. By rotating this shaft the cam members may be adjusted simultaneously and in unison longitudinally of the bed to bring the riser portions of the cams into proper position relatively to the central margin of any form being used. A set-screw 63 threaded through one of the bearings of the shaft 57 is adapted to lock the shaft against rotation after the cam members have been adjusted to the required position and one end of the shaft 57 is preferably squared as shown at 6 to receive a handle by which the adjusting movements may be effected.

It is believed that my invention and many of its attendant advantages will be understood from the foregoing without further description and, while I have shown and described that practical embodiment of my invention which at the present time seems to be preferable, it will be obvious that various mechanical changes in the construction of the various parts may be resorted to without departing from the spirit of the invention or sacrificing any. of the material advantages thereof.

I claim:

1. In a printing press, the combination of a reciprocatory bed, a plurality of inking rolls, independent mechanisms at each side of the bed adapted to simultaneously elevate both ends of the rolls, and means mounted on the bed and connected to simultaneously adjust said mechanisms whereby the raising of the rolls may be hastened or retarded'relatively to a predetermined position of the bed.

2. In a printing press, the combination of a reciprocatory bed, cam mechanism carried by said bed, a plurality of inking rolls, means adapted to be operated by said cam mechanism for raising and lowering said rolls at predetermined positions of the bed, and a single adjusting means mounted on the bed whereby the cam mechanism may be adjusted to hasten or retard the raising and lowering movements of all of the rolls.

3. In a printing press, the combination of a reciprocatory bed, a cam mounted on each side of said bed, an inking roll, a plurality of plates upon which said inking roll is mounted, operative connections between said plates and said cams whereby the roll is raised and lowered upon reciprocation of the bed, and means mounted on the bed for simultaneously adjusting the position of said cams to hasten or retard the raising and lowering movements of said roll.

4. In a printing press, the combination of a reciprocatory bed, cams carried on each side of the bed, a plurality of inking rolls, raising and lowering mechanism connected with each of said rolls and adapted to be operated by said cams to raise and lower said rolls in succession at predetermined positions of the bed, and an adjusting mechanism carried on the bed whereby the cams may be synchronously adjusted to hasten or retard said raising and lowering movements of the rolls.

5. In a printing press, the combination of a reciprocatory bed, cams adjustably mounted on each side of the bed, inking rolls, reciprocatory plates upon which said rolls are mounted, means including a rack and pinion for operatively connecting said plates with said cams whereby the rolls are raised and lowered from the cams at predetermined positions of the bed, and adjusting mechanism whereby the position of the cams on the bed may be varied to hasten or retard the times at which the rolls are raised and lowered.

6. In a printing press, the combination of the main frame of the machine, a reciprocatory bed, a pair of cam members adjustably connected with said bed, a plurality of inking rolls, a pair of plates for each roll, sockets mounted on said plates and supporting the rolls, oscillatory members mounted on the frame and connected with said plates for imparting a right line movement thereto, cam followers fixed on said oscillatory devices and adapted to be actuated by said cam members for imparting right line rais ing and lowering movements to said rolls in succession upon reciprocation of the bed, and mechanism connected With both of said cams whereby the cams may be adjusted and maintained in predetermined relation.

7. In a printing press, the combination of a reciprocatory bed, cam members adjustably mounted thereon to reciprocate there- With, inking rolls, mechanism adapted to be 1 operated from said cam members to raise and lower said rolls in succession upon reciprocation of the bed, racks formed on said cam members, an adjusting shaft eXtending transversely of the machine, and pinions 011 said shaft meshing- With said racks Whereby upon rotation of the shaft said cam members may be adjusted longitudinally of the bed.

ROBERT TAYLOR JOHNSTON. W itnesses IRA J. WILSON, M. A. KIDDIE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, 1). C.

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