US1087975A

US1087975A - Printing-press.

Info

Publication number: US1087975A
Application number: US74538913A
Authority: US
Inventors: Edwin A Parker
Original assignee: Individual
Current assignee: Individual
Priority date: 1913-01-31
Filing date: 1913-01-31
Publication date: 1914-02-24
Anticipated expiration: 1931-02-24

Description

E. A. PARKER.

PRINTING PRESS.

APPLICATION FILED JAN.31

Patented Feb. 24, 1914.

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E. A. PARKER PRINTING PRESS.

APPLICATION FILED JAN. 31, 1913.

Patented Feb. 24, 1914.

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PRINTING PRESS.

APPLICATION FILED JAN.31, 1913. 1,087,975, Patented Feb. 24, 1914.

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PRINTING-PRESS.

Specification of Letters Patent.

Patented Feb. 191%.

Application filed January 31;, 19-13. $eria1 Ho, 245,339.

rial, such as rubber, and printed from said blanket upon sheets. This mode of printing is usually employed in lithographic work and its particular advantages are clearer and sharper printing, and enabling to print from positive plates.

The principal object of my invention is to provide a simplified, inexpensive, and improved printing press for this purpose, which is readily manipulated and adaptable for a large variety tof finely printed work.

Other objects and advantages will hereinafter appear.

"In the accompanying drawings,-Figure 1 is an end elevation of the press, half of which is shown in section, taken on the line a'a; of Fig. 2, and the remaining half is shown in full. Fig. 2 is a side elevation of the press. Fig. 3 is a lan of Fig. 2. Fig. 1 is a view showing t e impression roller pressed against the bed of the press while printing. Fig. 5 is a similar view showing the roller maintained away from the surface of the bed while returning to its initial position. Fig. 6 is a perspective viewshowing the arrangement of the pressure cams.

An impression-roller 1, the surface of which is of rubber composition, cooperates with a bed 2, preferably of cast metal, which rests upon a stand 3 supported by legse,

Figs. 1 and 2. Said bed has overhanging sides 5 which fit over edges 6 and are seated upon ledges 7 of stand 3, and screws 8 passing through the stand thread intothe sides 5 whereby said bed and stand are firmly held together. Y

The roller 1 has axles 9 to which are keyed, by the keys 9, gears 10 provided with hubs 11 which are rotatably mounted in bearings 12, held on a roller-carriage 13. Said carriage is a castirame havin upright sides 13*, at either end of the r0 er 1, which are connected by a web 13 extending above said roller. The gears 10 being disposed between the roller and the bearings 12 and being keyed to. the roller axles 9 thus maintain, the roller against longitudinal movement and rotate together therewith.

- Wheels 14; mounted upon the carriage sides 13 ride in upper and lower channeled

tracks

15, 16, and t e gears 10 are in mesh with racks 17' fixed in depressions 18 of the bed 2, whereby when a crank 19, fixed by means of screws 20 to the hub 11 of one of said gears, is revolved'the roller 1 may be advanced from the position shown in Fig. '2 to the opposite end of the bed. and backwa-rdly. Said wheels 14 are held on the carriage by studs 21 fixed. thereto with' nuts 22, and are disposed in recesses 23., formed by the sides 5 of the bed and ledges 24 provided on the stand 3,. The upper and lower tracks 15., 16 are recessed into the sides 5 and ledges 24 respectively, and preferably taper outwardly, to which shape said guide rolls conform. 1

The bearings 12 are vertically slidable by means of guide ways'25 thereof, Fig. 3, sliding in cooperating guides26 of the carriagesides 13*, whereby the roller 1 is shiftable toward and away from the bed 2. Springs 27 on spring-plates 28 fixed to the carriage by screws 29, Fig. 2, continually press against said bearings upwardly. On the bearings 12 are formed lugs 30 which carry jaws 31 in the ears 32 of which are mounted rollers 33, and in lugs 34: provided upon the carriage 13 is mounted a rock-shaft 35 having cams 3.6 fixed thereto which cooperate with the rollers 33. Said cams are actuated by rocking the shaft 35 with a handle 37 fastened thereon.

When the shaft 35is rocked and the ban dle 37 set approximately horizontally to the position shown in Fig. 2, the portions 39 of cams 36 bear downwardly upon the rollers 33, utilized to prevent wear of the cam surfaces 36, and, the bearings 12 being forced downwardly contrary to the pressure of springs 27, cause the roller 1 to be pressed forcibly against the bed 2, Fig. 4, so that the roller is in pressed roll-in contact with said bed when advanced. hen said shaft is rocked op ositely and its handle 37 setapproximate y vertically, Fig. 5, the portions 3801? the cams, which are nearer the center of said shaft than the portions 39, are

. brought in ooiiperation with the rollers 33,,

so that the bearings 12 are causeclto slide upwardly by thev pressure of springs 27,

thereby releasing the pressure of the roller 1 against the bed 2 and-lifting it out of contact with the surface of said bed. Although the gears 10 are thus lifted from the racks 17 when the roller 1 is shifted as seen in Fig. 5, they are still maintained in mesh with said racks whereby the carriage, roller, and

all parts dependent therewith maybead vanced over said bed forwardly and backwardly. q

It will be evident that when the roller 1 advances in rolling contact'with the bed 2 the wheels 14 are in pressed contact with the upper tracks 15., caused by the downward pressure of the roller,- and ride thereupon. Whereas, when the roller is advanced while maintained away from the bed said wheels rest upon the lower tracks 16 and ride thereupon.

To obtain an accurate rolling contact of the roller 1 with the bed 2, the pitch diameter of the gears 10 is made the same as the diameter of said roller, and the pitch lines of the racksl? are in alinement with the surface of said bed, which is an accurate plane.

The jaw 31 has a threaded shank 40 C011".

nected swivelly therewith, which enables to adjust the distance between the periphery of therollers. 33 and the center of the rockshaft 35 in order to regulate the pressure exerted by. the roller 1 against the bed 2 when the cams 36 are actuated. Threading the shanks 40 into the lugs 30 upwardly decreases the distance between rollers 33 and shaft 35, and the pressure exerted by the roller 1 is consequently increased, while threading said shank downwardly correspondingly. decreases said pressure. Locknuts 41 on the shanks 40 tightened against the lugs 30 maintain said shanks and rollers 33 where adjusted. Q

When using the press, the roller 1 is first brought to the initial position, Figs, 2, 3. A. lithographic plate 42 from which an impression may be taken and a sheet as, to be printed upon, indicated by the dot and dash lines,

Fig. 3, are placed upon the bed 2 and prop.

erly alined, and the cam actuating handle 37 is then set as shown in Fig. 4 to press the roller 1 against the bed 2. The crank 19 is then revolved and the roller 1 thus advanced on its forward stroke, in rolling contact with the bed 2, plate 42, and'sh'ee't 43, to the position shown by the dot and dash circle P, Fig. 2. The plate 42 and sheet 43 being quite thin their surfaces constitutin the printing bed practically coincide wit the surface of said bed 2. During said forward stroke the roller makes approximately two revolutions and during its first revolution receives its impression from the plate 42 upon its periphery and during its second revolution prints the same upon the sheet 43. The handle 37 may then be set to the posinoe'neva tion shown in Fig. 5, and the impression roller 1 thereby lifted from the bed; and, the crank 19 being revolved oppositely, the roller may be advanced on its return stroke while maintained away from the surface of the bed, or of plate 42 'to its initial position. A blank sheet may now be substituted and, after the plate 42 is inked, the above mentioned operation'may be repeated any number of times until the desired number of sheets have been printed.

Stops 4d, 45, lBigs. 1 and 2, fixed to the sides 5 of the bed-casting by threading therein, limit the strokes of the-carriage13 in either direction. Upon the rock-shaft 35 are provided pins46, 17 ,Fig. 6, which abut against a pin 48 fixed on one of the lugs 34 whereby the movements of said shaft and of the cams 36 are limited when the handle 37 is set in either position.

Variations may be resorted within the scope of the invention, and ortions of the improvements may be used without others.

Having thus described my invention, I claim:

1. In a printing press, the combination with a bed, an impression roller having a forward and return stroke over said bed, and a carriage for said roller, of bearings for said roller shiftable toward and away from said bed, an extension on each of said bearings, a rock shaft mounted on said carriage extending from one of said hearings to the other, andia cam on said shaft for each of said extensions adaptable to coiiperatetherewith, said shaft adaptable to be operated to actuate said cams and bearings to exert pressure of said roller against the printing surface on said bed and to release said pressure, said extensions being adjustable toward and away from said cams to regulate said pressure.

2. In a printing press, the combination with a bed, an impression roller having a forward and return stroke over said bed, and a carriage for said roller, of bearings for said roller shiftable toward and away from said bed, an extension on each of said bearings, a cam mounted on said carriage for each of said extensions adaptable to cooperate therewith, and means to actuate said cams for exerting pressure of said roller against said bed-and to release said pressure, said extensions being adjustable toward and-away from said cams to regulate said pressure.

3. In a printing press, the combination of a bed, an, impression roller having a forward and return stroke over said bed, a cam actuated to exert pressure of said roller against said bed during its forward stroke, a wheel cotiperating with said cam and receiving its pressure, the distance between said wheel and cam being adjusted to reguits cam being actuated to release said pressure during the return stroke, and means to maintain said roller away from the; surface of said bed during its return stroke.

4. In a printing press, the combination of a printing bed, an impression roller having a forward and return stroke over said bed, a carriage for said roller, bearings for said rollershiftable toward and away from said bed, a cam on said carriage cooperating with said bearings actuated to exert pressure of said roller against said bed during its'forward stroke, an adjustable member on said bearing pressed upon by said cam to regulate the pressure exerted by said roller, said cam being actuated to release said pressure during the return stroke, and means to maintain said roller away from the surface of said bed during its return stroke.

5. A printing press having the combination of a printing bed, an impression roller having a forward and return stroke thereover, a carriage for said roller, fixed racks, gears fixed on said roller meshing with said racks for advancing the carriage and roller, bearings for said roller shiftable toward and away irom said bed, springs pressing said bearings, wheels on said carriage, tracks over said Wheels, tracks below said wheels,

adjustable extensionson said bearings, camsactuated to bear against said extensions, said cams set to ride said wheels 'uponsaid upper tracks and exert pressure of said roller against said bed, and said springs riding said wheels upon said lower. tracks and maintaining said roller. away from the surfaceof the bed during the return stroke.

6. A printing press having the combination of a printing bed, an impression roller having a forward and return stroke thereover, a carriage for said roller, wheels'for said carriage, means to exert pressure of said roller against said bed during its for-' ward stroke and maintain it away from the bed during its return stroke, fixed racks, gears for advancing said roller and carriage on said strokes, said gears meshing fully with said racks during said forward stroke and meshing artially during said return stroke, tracks or riding said wheels thereon when said gears and racks are in full mesh to preserve the alinement of their pitch lines, and tracks for riding said wheels thereon when said gears and racks mesh partially and said roller is maintained away from said bed.

7. A printing press having the combination of a printm bed, an impression roller having a forwar and return stroke thereover, a carriage for said roller, fixed racks, gears fixed on said roller meshing with said racks for advancing the carriage and roller, bearin for said roller shiftable toward and away om said bed, springs pressing said bearings, wheels on said carriage, tracks over said wheels, tracks below said wheels, cams set to ride said wheels upon said upper tracks and exert pressure of said roller against said bed, and said springs riding said wheels upon said lower tracks and maintaining said roller away from the sur-, face of the bed during the return stroke.- a

8. A printing press having the combination of a printingbed, an impression roller having a forward and return stroke thereover, a carriage for said roller, wheels for said carriage, bearings for said roller shift= able toward and away from said bed, fixed racks, gears for advancing said roller and carriage on said strokes, a shaft mounted on said carriage to rock about its axis, cams mounted on said shaft adaptable when rocked to force said bearings to mesh said gears and racks fully and to exert pressure of said roller against said bed durin its forward stroke, springs pressing said iearings to mesh said'gears and ranks partially and to maintain said roller away from said bed during its return stroke, tracks for riding said wheels thereon when said gears and racks are in full mesh to preserve the alinement of their pitch lines, and tracks for riding said wheels thereon when said gears and racks mesh partially and said roller is maintained away from said bed.

9. A printing press having the combina- 'tion of a printing bed, an impression roller having a forward and return stroke thereover, a carriage for said roller, wheels for said carriage, fixed racks, gears for advancing said roller and carriage on'said strokes, means to exert pressure of said roller against said bed during its forward stroke and to mesh said gears and racks fully, means to maintain said rfoller away from said bed during its return stroke and to mesh said gears and rackspartially, tracks for riding said wheels thereon when sa d gears and racks are in full mesh to preserve the alinement of their pitch lines, and tracks for riding said wheels thereon when said gears and racks mesh partially.

10. A printing press having the combination of a printing bed, an impression roller having a forward and return stroke thereover, a carriage for said roller, wheels for said carriage, earings for said roller shiftable toward and away from said bed, fixed racks, gears for advancingsaid roller and carriageonsaid strokes, cams mounted on said carriage adaptable when rocked to force said bearings to mesh said gears and racks fully and toexert pressure of said roller against said bed during its forward stroke, springs pressing said bearings to mesh said gears and racks partially andto maintain said roller away from said bed durin its return stroke, tracks for riding said w eels thereon when said gearsand racks are in full 7 mesh to preserve the alinement of their pitch lines, and tracks for riding said wheels thereon when said gears and racks mesh partially. p

- 11. In a printing press, the combination with a bed, an impressionroller cooperating therewith, and a'carriage for said roller, of bearings for said roller shiftable toward and away from said bed, a shaft having its longitudinal axis stationary being mounted in stationary bearings on said carriage and adaptable to rock about said longitudinal axis, and a cam on said shaft foreach of said roller bearings adaptable to cooperate therewith, said shaft being rocked to actuate said cams and hearings to exert pressure of said roller against the printing surface on the bed and to release said pressure.

12. In a printing press,-the combination with a bed, an impression roller cooperating therewith, and a carriage for said roller, of bearings for said roller shiftable toward and Y away from said bed, a shaft mounted on said carriage having its longitudinal axis stationary and being adaptable to rock about its longitudinal axis, cams mounted on said shaft adaptable to press said bearings, and

' means to actuate said cams for exerting pressure of said roller against the printing surface of said bed and to release said pressure.

13in a printing press, the combination with a bed, an impression roller having a forward and return stroke over said bed, and a carriage for said roller, of bearings for said roller shiftable toward and away from saidbed, a shaft mounted on said carriage having its longitudinal axis stationary and being adaptable to rock about said axis, said shaft extending from one of said hearings to the other, and cams on said shaft adaptable to press said bearings when said shaft is rocked to force saidroller against the printing surface of said bed on its for ward stroke.

Signed at the city of New York, in the county. of New York, and State of New York, this th day of anuary, A. D. 1913.

EDWIN A. PARKER.

Witnesses:

CHAS. W. La RUE B. Roman.