US2188148A

US2188148A - Rotary printing press

Info

Publication number: US2188148A
Application number: US17182A
Authority: US
Inventors: Harless Charles Alonzo
Original assignee: GOSS PRINTING PRESS CO Ltd
Current assignee: GOSS PRINTING PRESS Co; GOSS PRINTING PRESS CO Ltd
Priority date: 1935-04-19
Filing date: 1935-04-19
Publication date: 1940-01-23
Anticipated expiration: 1957-01-23

Description

C. A. HARLESS ROTARY PRINTING PRESS Jan. 23, 1940.

Original Filed April 19, 1935 6 Sheets-Sheet l INVENTOR ATTORNEYS Jan. 23, 1940.

c. A. HARLESS ROTARY PRINTING PRESS Original Filed April 19, 1935 6 Sheets-Sheet 2 Jan. 23, 1940. 'c. A9 HAIRLIESSI ROTARY PRINTING PRESS I 6 Sheets-Sheet 3 Original Filed April 19, 1935 ATi' gv Jan. 23, 1940. A. HARLESS ROTARY PRINTING PRESS Original Filed April 19, 1935 6 Sheets-Sheet 4 Jan. 23, 1940. Q C.IA HARLEss ROTARY Immune PRESS Original Filed April 19, 1935 6 Sheets-Sheet 5 RNEYS Jan. 23, 1940.

.c. HARL ESS ROTARY PRINTING PREss OriginalfFiled April 19, 1935 6 Sheets-Sheet 6 Patented Jan. 23, 1940 I UNITED STATES PATIENT OFFICE ROTARY PRINTING PRESS Charles Alonzo Harless, Oak Park, Ill., assignor to The Goss Printing Press Company, Ohicago,-Ill., a corporation of Illinois I Application April 19, 1935, Serial No. 17,182

Renewed June 24, 1939 32 Claims.

- the invention are means for variably and resiliently urging both ends of the impression roller towards the printing cylinder'with equal force a d'other means for varying the pressure on ei her end of the roller.

In accordance with the illustrative embodiment of the invention there are provided a pair of printing press side frames in which are rotatably mounted the usual rotary photogravure printing cylinder, together'with suitable inking The invention consists in the novel parts, cop; jnechanism, web guides, etc. These side frames struction, arrangements; combinations and im provements herein shown anifdescrlbed.

The accompanying drawings, referred to herein and constituting a part hereof;=lllustrate one embodiment of the invention, and together with the description, serve to explain the principles of the invention.

0f the drawings:

Fig. 1 is a fragmentaryside elevation of an illustrative embodiment of a rotary photogravure press constructed in accordance with the present invention with certain parts broken away;

Fig. 2 is a section taken on the line 2.4 of 1 Fig. 3 is a detailed vertical section taken on the line 33 of Fig. 1;

Fig. 4 is'an enlargedsectional view similar to the lower left portion of Fig. 3 but showing more details of construction;

Fig. 5 is a section taken on the line Fi 4;

Fig. 6 is a detail side elevation of the indicating mechanism with its cover broken away; and

Fig. 7 is a section taken on the line '|'I of of a rotary photogravure press in which the impression roller is resiliently supported and is variably and resiliently urged towards the printing cylinder. A further object is the provision of a rotary photogravure impression mechanism in which the impression roller and its pressure cylinder are relatively movable toward and from each other and axially with respect to each other.

The invention also includes a novel means for' raising, lowering and limiting the movement of the pressure cylinder and impression roller relative to the printing cylinder. Also included in I are provided with vertically extending guideways, the g iidewayin one frame being alined with the guideway in the other frame, and in each guideway there is mounted a slidable frame carrying tliegfpressure cylinder and impression roller. Screw means are provided for raising and lowering the frames and amotor is geared to these screw means for the simultaneous power operation of the screw means.

Preferably, and as embodied, a bearing bloc is resiliently mounted in each of the slidable frames, and the pressure cylinder isrotatably mounted in the bearing blocks by means of selfalining, anti-friction bearings which permit limited angular motion of the cylinder with respect to the press frames and bearing. blocks. The impression rollerhas it shaft ends provided with anti-friction bearings which are removably seat- 'ed in arms fixed to brackets which are ,slidingly pivoted on and depend from the bearing blocks, being adjustable thereto so that the-pressure cylinder and impression roller may be held in contact with each other; Spring means are provided, carried on the slidable frames for resiliently moving both ends of the pressure cylinder and impression roller with equal force against the pressure of their resilient supporting means,

to resiliently vary the pressure exerted to force the paper web against and into the inked, intagliateddesign on the printing cylinder.

Other means are provided for varying the resilient force acting against the ends of the cylinder and roller, so that the resilient pressure acting against the resilient supporting means dicating to'the operator whether normal oper-- ating pressure has been attained, and a limit switch is provided operated by the indicating means to prevent lowering of the pressure cylinder by the motor beyond the point where a predetermined pressure is created. Other means are provided for operating the limit switch whenever the pressure'cylinder is lowered to too low-a point thereby safeguarding against possible damage to the delicate printing cylinders employed. The impression roller guiding arms pivotally mounted on the brackets are provided with means for holding them in raised position when the printing cylinder is to be removed, thereby giving the operator greater freedom in moving the cylinder.

It will be understood that the foregoing general description and the following detailed description as well, are exemplary and explanatory of the invention, but are not restrictive thereof.

Referring now in detail to the illustrative embodiment of the invention as shown in the accompanying drawings, there are provided a pair of press frames l8 and l l in which is rotatably journalled a rotary photogravure printing cylinder l2 of conventional construction which is provided with suitable driving means (not shown). The side frames Land II are each provided with a rectangular opening I3 having vertical sides l4 formed as guideways, the guideways in one frame being accurately alined with the corresponding guideways in the other frame. Within the apertures I3 and extending across the width of the press are a rotatable impression roller l5 and a rotatable pressure cylinder l8. Cylinder l6 presses against the upper surface of the impression roller while the lower surface of the impression roller l5 presses the web of paper I! to be printed against the surface of the rotary photogravure cylinder l2 and into' the minute, inked, intagliated portions of the cylinder l2 so that the ink in these portions is transferred to and remains adherent on the surface of the paper web H.

For supporting the pressure cylinder l6, there Q is provided at each of its ends an open frame 28 slidably mounted for vertical movement between the guideways l4 in the frames l8 and II. of the frames 28 is securely fastened at its upper end to a vertical, upwardly extending screwthreaded member 2| which is in threaded engagement with a threaded sleeve 22 keyed within a worm gear 22 held against axial movement by means of the

caps

23 and 24 secured to the housings 25. The housings 25 are mounted on their respective side frames l8 and I l at 'the upper part of the apertures I3.

Power-driven means are provided for simultaneously rotating the worm gears 22 in either direction to raise or lower the slidable frames 20 equally and simultaneously by means of their screw-threaded supportingmembers 2|. For this purpose, a horizontal shaft extends from one side of the press to the other and is rotatably journalled in bearings 3| and 32 mounted in the housings 25. Shaft 38 has keyed to it a relatively large gear 34 meshing with a pinion 35 mounted on the shaft of motor 38 which is secured to one of the transverse press frame members 31. A housing 38 is provided for enclosing the

gears

35 and 34. Within the housings 25 and meshin with the worm gears 22 are worms 48 fixed to the shaft 38, and as the motor 36 rotates in either Each ings 32 may be anti-friction radial thrust bearings. At one end, shaft 38 is provided with a squared end 38' to which a hand crank may be secured in case of failure of the power-operating means, and this square end is preferably covered 5 by means of a cap 44. Adjacent to the gear 34, shaft 38 is provided with a bearing mounted in a bracket 46 projecting from another transverse frame member 48 of the press.

For disassembly, the flanges 42 may be disconnected, threaded members 2| are disconnected from the open frames 28 and then the housings 25 with their associated gears and the open frame 28 may be removed from the press.

For guiding the open frames 20 in their vertical sliding movement within apertures l3, guide plates 58 are secured to the corners of the open frames 28, and these plates overlap the sides of guideways l4, thereby holding the open frames 28 against movement axially of the cylinder I6.

Means are provided for resiliently and rotatably supporting the pressure cylinder 16 at i ends within the open frames 20, and for this purpose the lower horizontal reach 58' of the open frames 28 is formed with one or more apertures 5| to receive the relatively stiff helically coiled springs 52 which are supported within the apertures 5! by screw plugs 53. The upper ends of springs 52 project into similar recesses 54 formed in the lower part of each pressure cylinder supporting block 55. These blocks 55 are preferabl rectangular and are closely but slidingl'y fltte' between the vertical sides 58 of the lower part of their respective open frame 20, thereby permitting vertical movement of the block 55 against the resiliency of springs 52 while at the same time practically eliminating any side motion of the blocks 55.

The bearings for rotatably supporting the cylinder I 8 within the bearing blocks 55 preferably comprise self-alining roller bearings 58 fitted to the reduced shaft ends 59 of cylinder l 8, and the e bearings 58 are firmly held on the shaft end 59 against the shaft shoulder 68 by means of a retaining cap 6| which may be held to the shaft ends by means of screw 62. The outer race of bearings 58 is firmly held within the bearing blocks 55 by means of a retaining ring which in turn is held in place by meansof a retaining flange 88,

bolted to the bearing block 55. On its other side, the outer race of bearings 58 is held against a flanged collar 88 which is bolted to the outer side of the bearing block 55. Along its vertical side and its bottom side the flange 18 of collar 68 is relieved where it overlaps the ope. frame 20, this relieving serving to limit the'possible axial displacement of the cylinder 6. Oil sealing rings H are provided on each side of the bearing 58 to prevent leakage of lubricant from the bearing.

Impression roller I5 is preferably a relatively small roller slightly longer than the width of the web to be printed and of substantially the same length as the relatively large pressure cylinder l6 and the printing cylinder l2. For rotatably supporting the impression roller l5 there are provided a pair of U-shaped brackets 80, one at either end of the roller 15. At their upper ends, each leg of each bracket 88 is formed with an elongated vertical slot 8| through which passes a pivot screw 82 extending from lugs 83 on retaining flange 68.

The two pivot screws 82 are arranged diametrally of the shaft 59 and provide a pivotal mounting for the U-shaped brackets 88, at the same time permitting vertical sliding movement of each bracket while holding the bracket against sidebracket 80, a stop screw 85 is threadedly mounted and extends vertically downwardly into contact with the upper side of the pivot screws 82, thereby limiting downward movement of the brackets 80. On the inner face of the lower reach of each bracket 80 is formed a bearing-receiving socket for receiving and supporting the impression roller shaft bearings. For this purpose, semi-cylindrical seats '82, adapted to receivethe housing of bearing 93, are provided and bearing 93 is held therein by means of the removable bearing cap 34 and screws 95. n the outer sides of brackets 80 are pivotally mounted arms 90 each, of which is provided with a rail 36 adapted to serve as a track for the impression roller shaft ends 91, permitting the roller to be rolled into and out of operative position. A latch pin I00 is seated in the bracket 80 and has its end projecting therefrom, being resiliently urged outwardly bymeans of spring IOI. This latch pin is engageable with a notch I02 formed in the upper part of arm '80 and serves to latch the arm in raised position when the printing cylinder I2 is to be removed, or whenever it may be desired to hold the arm in its raised position, as during printing. 1

The legs of bracket 80 are sumciently long and screws 85 are so positioned that the upper surface of roller I is held very lightly in contact with the lower surface of cylinder I6, and slots 8| permit roller I5 to be moved closer to cylinder I6'under pressure.

Means are provided for resiliently pressing the cylinder bearing supporting blocks 55 downwardly against the compression of their supporting springs 52, and these means preferably comprise a single spring and connections for transmitting the resilient force of this spring equally to the two bearing blocks 55. As embodied, a wide bell crank H0 is pivotally mounted and received within the opening in each slidable frame 20, and is pivotally mounted by means of shaft III rotatable within lugs II2 formed'integrally with the frame 20. The two bell cranks IIO are each provided with a bracing web I I4 to give added strength thereto. One end .of each bell crank is recessed to receive a fulcrum pin H5 bearing against a fulcrum plate 6 on the top of bearing block 55, so that oscillation of the bell cranks IIO produces a corresponding vertical movement of the bearing blocks 55 and of the cylinder shaft ends 59, and similarly vertical movement of either or both of the shaft ends 59 produces a corresponding oscillation of the bell crank H0.

The upper ends of bell cranks IIO are bifurcated'and hooked, as at I20, and these upper ends of the bell cranks are resiliently urged together by means of spring I2I coiled about shaft I22.

Spring I2I is compressed between a collar I24, pinned to the ends of shaft I22 by pin I25, and a collar I26 slidable on shaft I22 and provided with laterally extending stub shafts I21, which are received within the hooked portion of one bell crank IIO. At its other end shaft I22 is provided with a slidable collar I30 having stub shafts I3I received within the hooked end of the other bell crank I I0, and shaft I22 is threaded at I33 to receive the correspondingly threaded hand wheel I34. 'A locking nut I35 is provided for securing the hand wheel I34 in any desired position.

By turning hand wheel I34, the compression of spring I 2I may be varied, thereby varying the downward pressure exerted against the fulcrum .gpression roller I5.

one side of one of the open frames 20. To the plates H6 and consequently varying the pressure exerted-by pressure cylinder I6 against the im- This varying pressure also varies the pressure of impression roller I 5 against the web I1 and the printing cylinder I2. 5

Means are provided for variably increasing the resilient pressure exerted against the bearing blocks 55 so that the'pressure on either end of the cylinder I6 may be increased or be made greater than the pressure on the other end of 1 the cylinder. For this purpose a pair of coil springs I40 and HI are provided surrounding shaft I22 and positioned between the open frames 20. Springs I40 and MI are normally held without being compressed between the double collet I42 and their respective collets I43, and I44, while collets I43 and I44 are held against the inner end walls of cover I45 surrounding shaft I22 and secured to transverse frames I46supported on the inner faces of open frames 20. i

A tube I50 surrounds shaft I22 and is threaded within collet I42 at one end and at its other end is fixed to hand wheel I5I. Hand wheel I5I is rotatably mounted with respect to .hand wheel I34 and shaft I22 by means of ball bearings I52 and I53 and together with the tubular sleeve I50 is axially movable with respect to shaft I22. Collet I43 surrounds and is slidable on tube I 50, while collet I44 is slidable on shaft I22, and collet I42 is moved axially of tube I50 by rotation thereof. Means are provided to hold collet I42 against rotation and for this purpose an integral arm I55 extends upwardly therefrom through slot I56 formed in the cover I45. A rod I51 is fixed to arm I55 and is slidable in the upper part of open frame 20. An index scale I60 is mounted on the frame I20 and by reference to the index mark I6I on rod I51 it canbe determined which, if either, of the springs I40 and MI is compressed and to what extent. By turning the hand' wheel I5I-, one or the other of the springs I40 and I4] is compressed, depending on the direction of rotation of hand wheel I5I, and

thereby a difference of pressure between one end and the other of cylinder I6 may be established. Means are provided for indicating the relative position of the pressure cylinder I6 with reference to the impression rollerI5 and for this purpose a bell crank I10 is pivotally mounted on 50 shorter arm of bell crank I 10 is pivotally connected a threaded link "I which is slidable through a lug I12 projecting from the outside of bearing block 55. Link I1I is resiliently urged 56 upwardly'by means of spring I 13 coiled about link "I and on the other side of lug I12 a thumb screw I 14 is threadedon the end of link I1I. At its upper end bell crank I10 is provided with a pin I16 fitting into a slot I11 formed in the upper end of lever I18. Lever I18 is rigidly attached-to gear I19 and 'is rotatably mounted within the casing I80 mounted onthe open frame 20, and any backlash is taken up by means of tension spring I 8|. Gear I19 meshes with a relatively small pinion I83 also pivotally mounted in the casing I 80 and connected to a pointer I85 on the outside of the casing. 4 A scale I86 is provided to indicate the normal position of cylinders I6 and I2. As spring I2I moves the pressure cylinder I6 downwardly against the resiliency of springs 52 the pointer I85 is moved to the right, indicating a decrease in the distance between the cylinders and a corresponding increase in the pressure which is exerted against the web with I I the roller I5 and cylinder I61 in normal printing position, and the pointer I 85 may be initially brought to its correct and normal position by turning of the thumb screw I14.

Means are also provided for preventing injury to the mechanism through possible carelessness of the operator in lowering the cylinders by 1110- tor 36. For this purpose bell crank H is formed with a latterly projecting shoe I90, projecting through the side of casing I80 and adapted to contact with the roller I9I mounted at the end of switch-operating arm I92 of limit switch I93 so that when the cylinder I6 and roller I are returned to their normal operating position, or when the pressure between cylinder I2 and roller I5 increases beyond a predetermined'amount, shoe I90 moves the lever I92 sufliciently to open the limit switch I93 and thereby interrupt the supply of power to motor 36.

In case the pressure cylinder I 6 is lowered with the impression roller I5 removed, no pressure would be indicated by the pointer I86 or shoe I90, and to guard against possible lowering of the impression

roller supporting brackets

96 and 80 into contact with the surface of the printing cylinder I 2, stop I95 is provided on the open frame 20, being positioned so as to open the limit switch I93 on movement of the pressure cylinder I6 only slightly below its normal operating position. A second limit switch I91 is also provided in the motor circuit to be operated by the stop I95, thereby preventing damage through the attempt to raise the pressure cylinder I6 to too great a height;

In initially setting the press for proper operation, the open frames 20 are lowered to their proper position, and thereby establish a predetermined pressure between the cylinders I2 and I 5. When this pressure has been established, the pointer I85 is set at zero, and thereafter indicates normal impression pressure for cylinder I2 or another cylinder of the same size.

In the operation of the illustrative embodiment, the rotary photogravure printing cylinder is driven at the desired operating speed, driving the web of paper IT to be printed, the impression roller I5 and pressure cylinder I6, by frictional.

'pointer I85.

In this condition, roller I5 rests against cylinder I2 and is held-against excessive axial movement by means of brackets 80, while cylinder I6 is supported by contact-with roller I5 and by springs 52, and is pressed resiliently downwardly by means of spring I2I acting against the bell cranks I I0, which transform the horizontal compression of spring I2I into vertical compression of springs 52 and the resiliently covered roller I5.

When printing a fractional width web and when using a fractional width printing cylinder I2, hand wheel I5I is turned to compress one or the other of springs I40 and MI, thereby increasing the resilient pressure against the cylinder I6 and roller I5 at one end only, relative to the other end. When spring III is compressed, the pressure is increased on the left (Fig. 3) end of cylinder I6 and roller I5, and may be controlled so that the pressure between the left end of roller I5 and cylinder I2 is the same as the pressure of the right end of the fractional width cylinder against the corresponding part of the roller I5.

As cylinders I2 and I6 and roller I5 rotate, cylinder I6 and roller I5 rise and fall, and either end of these members may move independently of the other end, while the pressure on both ends is always equal (or when springs I40 and Ill are in use in an exact predetermined ratio) andcylinder I6 and roller I5 are permitted such limited angular and axial movement is as required by the irregularities in the surface of cylinder I2 or roller I5.

The invention in its broader aspects is not limited to the specific mechanisms shown and described but departures may be made therefrom within the scope of the accompanying claims without departing from the principles of the invention and without sacrificing its chief advantages. I

What-I claim is:

1. In a rotary photogravure printing press an impression roller, a pressure cylinder, means for rotatably supporting said cylinder, and pivotally mounted means radially movable with respect to said cylinder for rotatably supporting said roller whereby the roller may move toward and from said cylinder and axially thereof.

2. In a rotary photogravure printing press an impression roller, a rotatable pressure cylinder, resiliently supported bearings for said cylinder, bearings for said roller at the ends thereof, links pivotally interconnecting said cylinder and roller bearings, a spring, and means for applying force from said spring at either end of the cylinder against the resiliently supported cylinder bearings.

3. In a rotary photogravure printing press two press frame members having guideways, a slide in each guideway and vertically movable therein, a bearing support in each slide, springs supporting said support in each slide, a pressure cylinder rotatably mounted in said bearing support, an axially-movable impression roller mounted beneath. said cylinder and held parallel therewith, and means for compressing said springs.

4. In a rotary photogravure printing press an impression roller, bearings for rotatably mounting the roller by its ends, means for resiliently supporting the bearings, a spring and means for applying the force of said spring against both ends of the roller to move it and its bearings against their resilient supporting means.

5. In a rotaryphotogravure printing press animpression roller, a spring, means for applying the force of said spring against both ends of the roller, a pair of springs and means for optionally applying the force of one or the other of said springs against an end of the roller.

6. In a rotary photogravure printing press an impression roller, means for independently resiliently supporting the ends of the roller, a spring, means for variably compressing the spring, and means for applying the force of said spring against both ends of the roller to move it against itsresilient supporting means.

pressure cylinder, an impression roller, vertically movable bearing members for said cylinder, a frame mounted on said members and depending therefrom and provided with pivoted arms in which the roller is mounted, and means for holding said arms in raised position while a printing cylinderis moved.

9. In a rotary photogravure printing press a pressure cylinder, independently movable bearing blocks in which said cylinder is rotatably mounted, depending frames slidably pivoted on said blocks, and an impression roller rotatably mounted in said frames to contact with said cylinder.

10. In a rotary photogravure printing press a pair of press frames having guideways, one frame at either side of the press, a slidable frame in each guideway, screw means for raising and lowering the slidable frames, a motor for operating the screw means, a pressure cylinder, bearing blocks in which said cylinder is rotatably mounted, resilient means supporting said blocks on said slidable frames, an impression roller, brackets in which said roller is rotatably Journalled, means for pivotally and slidably supporting said brackets on said bearing blocks, a spring mounted-on one of the slidable frames, means for applying the force of said spring to said cylinder and roller against the resilient supporting means, a second resilient means, means for applying the force of said second resilient means against either end of the cylinder and roller, means for indicating the relative position of the pressure cylinder with reference to the printing cylinder, a limitswitch preventing lowering of the slidable frames by the motor below a predetermined point, and means controlled by the pressure indicator for operating the limitswitch on too great pressure between the pressure and printing cylinders.

11. In a rotary photogravure printing press a pair of press frames having guideways, one frame at either side of the press, a slidable frame in each guideway, a pressure cylinder, bearing blocks in which said cylinder is rotatably mounted, resilient means supporting said blocks on said slidable frames, an impression roller, brackets in which said roller is rotatably journalled, means for pivotally and slidably supporting said brackets on said bearing blocks, a spring mounted on one of the slidable frames, means for applying the force of said spring to said cylinder and roller against the resilient supporting means, a second resilient means, means for applying the force of said second resilient means against either end of the cylinder and roller, and means for indicating the relative position of the pressure cylinder with reference to the printing cylinder.

12. In a rotary photogravure printing press a pair of press frames having guideways, one frame at either side of the press, a slidable frame in each guideway, a pressure cylinder, bearing blocks in which said cylinder is rotatably mounted, an impression roller, brackets in which said roller is rotatably journalled, means for pivotally and slidably supporting said brackets on said bearing blocks, means for indicating the relative position of the pressure cylinder with reference to the printing cylinder, a limit switch preventing lowering of the slidable frames by the motor below a predetermined point, and means controlled by the indicator for operating the limit switch on too great pressure between the pressure and printing cylinders.

pair of mess frames having guideways, one frame at either side of the press, a slidable frame in each guideway, a pressure cylinder, bearing blocks in which said cylinder is rotatably mounted, an impression roller, means for supporting said roller on said bearing blocks, means for indicating the relative position of the preseach guideway, screw means for raising and lowering the slidable frames, a motor for operating the screw means, a pressure cylinder, bearing blocks in which said cylinder is rotatably mounted, resilient means supporting said blocks on said slidable frames, an impression roller,

brackets in which said roller is rotatably journalled, means for pivotally and slidably supporting said brackets on said bearing blocks, a spring mounted on one of the slidable frames, and means for applying the force of said springto said cylinder androller against the resilient. supporting means.

15. In a rotary photogravure printing press a pair of press frames having guideways, one frame at either side of the press, a slidable frame in each guideway, screw means for raising and lowering the slidable frames, a motor for operating the screw.means, a pressure cylinder, bearing blocks in which said cylinder is rotatably mounted, resilient means supporting said blocks on said slidable frames, an impression roller, brackets in which said roller is rotatably journalled, means for pivotally and slidably supporting said brackets onsaid bearing blocks, aspring mounted on one of the slidable frames, means for applying the force of said spring to said cylinder and roller against the resilient supporting means, and means for indicating the relative position of the pressure cylinder with reference to the printing cylinder.

16. In a rotary photogravure printing press a pair of press frames having guideways, one frame at either side of the press, a slidable frame in each guideway, screw means for raising and lowering the slidable frames, a motor for operating the screw means, a pressure cylinder, bearing blocks in which said cylinder is rotatably mounted, resilient means supporting said blocks on said slidable frames, an impression roller, brackets in which said roller is rotatably journalled, means for pivotally and slidably supporting said brackets on said bearing blocks, a spring mounted on one of the slidable frames, means for applying the force of said spring to said cylinder and roller against the resilient supporting v the indicator for operating the limit switch on too great pressure between the pressure ing cylinders.

1 7. In a rotary photogravure printing press a pair of press frames having guideways, one frame and printat either side of the press, a slidable frame in each. guideway, a pressure cylinder, bearing blocks in which said cylinder is rotatably mounted, resilient meanssupporting said blocks on said slidable frames, an impression roller, brackets in which said roller is rotatably journalled, means for pivotally and slidably supporting said brackets on said bearingblocks, and means for indicating the relative position of the pressure cylinder with reference to the printing cylinder.

18. In a rotary photogravure printing press a pair of press frames having guideways, one frame at either side of the press, a slidable frame in each guideway, a pressure cylinder, bearing blocks in which said cylinder is rotatably mounted, resilient means supporting said blocks on said slidable frames, an impression roller, brackets in which said roller is rotatably journalled, means for pivotally and slidably supporting said brackets on said bearing blocks, a spring mounted on one of the slidable frames, and means for applying the force of said spring to said cylinder and roller against the resilient supporting means.

19. In a rotary photogravure printing press a pair of press frames having guideways, one frame at either side of the press, a slidable frame in each guideway, screw means for raising and lowering the slidable frames, a motor for operating the screw means, a pressure cylinder, bearing blocks in which said cylinder is rotatably mounted, resilient means supporting said blocks on said slidable frames, an impression roller, brackets in which said roller is, rotatably journalled, means for supporting said brackets on said bearing blocks, a spring mounted on one of the slidable frames, and means for applying'the force of said spring to said cylinder and roller against the resilient supporting means.

20. In a rotary photogravure printing press a pair of press frames having guideways, one frame at either side of the press, a slidable frame in each guideway, screw means for raising and lowering the slidable frames, a motor for operating the screw means, a pressure cylinder, bearing blocks in which said cylinder is rotatably mounted, resilient means supporting said block on said slidable frames, an impression roller, brackets in which said roller is rotatably journalled, means for supporting said brackets on said bearing blocks, a spring mounted on one of the slidable frames, means for applying the force of said spring to said cylinderand roller against the resilient supporting means, means for indicating the relative position of the pressure cylinder with reference to the printing cylinder, a limit switch preventing lowering of the slidable frames by the motor below a predetermined point, and means controlled by the indicator for operating the limit switch on too great pressure between the pressure and printing cylinders.

21. In a rotary photogravure printing press, a printing cylinder, hearings in which it is removably mounted, an impression roller,.vertically movable frames in which said roller is removably mounted, movable arms extending from. said frames for guiding said roller into running position and means for holding said arms out of the path of the cylinder as it is removed or replaced.

22. In a rotary photogravure printing press, a pressure cylinder, a printing cylinder, a cylinder for pressing on the pressure cylinder to press a web against the printing cylinder, independently resiliently movable members for supporting the pressure cylinder, and self-alining anti-friction bearings carried bysaid members and by which said pressure cylinder is rotatably journalled.

23. In a rotary photogravure printing press,

-the combination of an impression member, means for resiliently pressing the member against a cylinder to be printed from, means for independently varying the resilient pressure exerted on both ends of the cylinder, and means for operating the independent means for both ends from one end of the cylinder.

24. In a rotary photogravure printing press, slidable cylinder bearing supporting members, a pressure cylinder mounted in said members, an impression roller, brackets in which said roller is rotatably journalled, means for pivotally supporting said brackets on said bearing supporting members, means for indicating the relative position of the pressure cylinder with reference to the printing cylinder, motor means for raising and lowering the cylinder, a limit switch preventing lowering of the slidable members by the motor below a predetermined point, and means controlled by the indicator for operating the limit switch.

25. In a rotary photogravure printing press, a pressure cylinder, vertically movable bearing blocks in which said cylinder is rotatably mounted, an impression roller, means for supporting said roller on said bearing blocks, means for indicating the relative position of the pressure cylinder with reference to the printing cylinder, resilient means for pressing the pressure cylinder downwardly against the impression roller and means forpreventing more than a predetermined movement between the pressure cylinder and frame during printing.

26. In a. rotary photogravure printing press, slidable bearing supporting members, screw means for raising and lowering the slidable members, a motor for operating the screw means, a pressure cylinder, said cylinder being rotatably mounted in said bearing supporting members, an impression roller, brackets in which said roller is rotatably journalled and means for pivotally supporting said brackets on said bearing supporting members.

2'7. In a rotary photogravure printing press, vertically movable bearing blocks, screw means for raising and lowering the blocks, a motor for operating the screw means, a pressure cylinder, said cylinder being rotatably mounted in said bearing blocks, resilient means acting on said blocks, an impression roller, brackets in which said roller is rotatably journalled and means for indicating therelative position of the pressure cylinder with reference to the printing cylinder.

28. In a rotary intaglio printing press, a design cylinder, a main sliding head, an impression roll carried thereby, an auxiliary head having a limited sliding movement in the main head, a back-up roll carried by the auxiliary head, and means acting through the auxiliary head and back-up roll for bringing the impression roll into coaction with the design cylinder at a predetermined printing pressure.

29. In a rotary intaglio printing press, a design cylinder, a main sliding head, an impression roll carried thereby, anauxiliary head having a limited sliding movement in the main head, a back-up roll carried by the auxiliary head, means acting through the auxiliary head and back-up roll for bringing the impression roll into coaction with the design cylinder with printing pressure, and means for automatically limiting the printing pressure.

30. In a rotary photogravure printing press a pair of press frames having guideways, one frame at either side of the press, a slidable frame in each guideway, a pressure cylinder, bearing '15;

blocks carried by said slidable frames and in which'said cylinder is rotatably mounted, an

impression roller, brackets in which said roller is rotatably journalled, means for supporting said brackets on said bearing blocks, and means for indicating the relative position of: the pressure cylinder with reference to the printing cylinder 31. In a rotary intaglio printing press, a design cylinder, a main sliding head, an impression roll carried thereby, an auxiliary. head having a limited sliding movement in the main head, a back-up means including a roll carried by the auxiliary head, and means acting through the auxiliary head and back -up means for bringing the impression roll into coaction with the design cylinder at a predetermined printing pressure.

32. In a rotary intaglio printing press, a design cylinder, a main sliding head, an impression roll carried thereby,. an auxiliary head having a limited sliding, movement inthe main head, a back-up means including a roll carried by the auxiliary head, means acting through the auxiliary head and back-up means for bringing the impression roll into coaction with the design cylinder with printing pressure, and means for automatically limiting the printing pressure.

CHARLES ALONZO HARLESS.