US3095809A - Master stripping means for rotary printing machines - Google Patents

Master stripping means for rotary printing machines Download PDF

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Publication number
US3095809A
US3095809A US58399A US5839960A US3095809A US 3095809 A US3095809 A US 3095809A US 58399 A US58399 A US 58399A US 5839960 A US5839960 A US 5839960A US 3095809 A US3095809 A US 3095809A
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United States
Prior art keywords
master
cam
stripper
shaft
master cylinder
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US58399A
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English (en)
Inventor
Harry F Gammeter
Francis R Patalon
Rudolph J Katterle
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AB Dick Co
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Multigraphics Inc
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Priority to US58399A priority Critical patent/US3095809A/en
Priority to GB31127/61A priority patent/GB946357A/en
Priority to BE608438A priority patent/BE608438A/fr
Priority to FR874248A priority patent/FR1301748A/fr
Priority to DEA38425A priority patent/DE1180376B/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41L—APPARATUS OR DEVICES FOR MANIFOLDING, DUPLICATING OR PRINTING FOR OFFICE OR OTHER COMMERCIAL PURPOSES; ADDRESSING MACHINES OR LIKE SERIES-PRINTING MACHINES
    • B41L19/00—Duplicating or printing apparatus or machines for office or other commercial purposes, of special types or for particular purposes and not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41L—APPARATUS OR DEVICES FOR MANIFOLDING, DUPLICATING OR PRINTING FOR OFFICE OR OTHER COMMERCIAL PURPOSES; ADDRESSING MACHINES OR LIKE SERIES-PRINTING MACHINES
    • B41L29/00—Devices for attaching printing elements or formes to supports

Definitions

  • a master plate is prepared bearing an ink receptive form of the image to be .duplicated, and this master is clamped in place on the so-called master or printing cylinder.
  • the image is selectively faced with ink on the basis of the lithographic principle, and the ink is oil-set in reverse image form on to the receptive surface of a so-called blanket on a blanket cylinder.
  • the blanket cylinder is coupled with 'an impression cylinder, and the sheets to be printed are fed between the blanket and the impression cylinder to receive the image in direct reading form from the blanket in successive cycles of the machine.
  • the primary object of the present invention is to enable this to be accomplished in a rotary off-set printing machine by parts that can be easily arranged in virtually any given machine of this class wherein the cylinders referred to are disposed between supporting side plates.
  • the releasing latch is under control of a solenoid or equivalent element that is to be energized after the predetermined number of machine cycles or impressions has been at tained.
  • Another object of the present invention is to so associa-te stripper elements with the master clamp releasing cam that these will be active only at the time the cam is actuated and as an incident thereto to peel the released master from the master cylinder.
  • Objects of the invention related to this are to actively pull the stripped master away from the master cylinder in an ejector operation and into a collecting tray, and todo this in such a way that the master will not be damaged to the extent that it cannot be reused; and to so construct and arrange the related ejector mechanism as to be removably mounted as a separate ejector attachment or unit on virtually any given machine of the aforesaid character.
  • Other objects of the present invention are to accurately control the action of the clamp releasing cam and the stripper elements; to accurately guide the stripped master to the ejector mechanism so that there is assurance that the master being ejected will not become jammed in the machine; to assure a firm and positive ejecting action on the used master; and to accurately time and control the operation of the stripper elements.
  • FIG. 1 is a perspective view from the top front of a machine constructed in accordance with the present invention and wherein the master and blanket cylinders have been removed;
  • FIG. 2 is a perspective view at the bottom rear of the machine
  • FIG. 3 is a side elevation of the machine
  • FIG. 4 is a side sectional view of the machine taken on the line l4 of FIG. 5;
  • FIG. 5 is a top plan view of the machine taken on the line 5-5 of FIG. 3;
  • FIG. 6 is a sectional view on an enlarged scale taken substantially on the line 6-6 of FIG. 5;
  • FIG. 7 is a detail plan view ofthe shaft in the machine which supports the stripper fingers
  • FIG. 7A is a fragmentary sectional view of an end portion of the shaft shown in FIG. 7;
  • FIGS. 8 and 9 are sectional views, each on an enlarged scale, and taken on the lines 8-8 and 99 of FIG. 5.
  • FIGS. 1, 4 and 5 which best show that a master cylinder 10, on which the duplicating lithographic master is mounted, is arranged on a shaft 10A for rotation between a pair of sturdy rear side plates ll and 12.
  • These plates are part of the main frame of the machine which also includes a pair of forward side plates 11A and 12A.
  • the plates 11 and 12 are pivotally mounted on a shafit 13, FIG. 4, supported by the front side plates 11A and 12A, and the frame plates are rigidly interconnected by various tie bars TB as will be evident in FIG. 4.
  • the master or plate cylinder 10 is gear driven and is arranged to rotate in contact with a blanket cylinder 14 which is supported on a shaft 14A in turn supported by the side plates 11A and 12A.
  • the lblanket cylinder is located above an impression cylinder 15 and defines a lbight therewith as will be evident in FIG. 4.
  • the impression cylinder includes a shaft 15A supported for rotation between the side plates 11A and 12A.
  • the image on the master plate carried on cylinder 16' is inked, and the ink representations are transferred to the blanket cylinder and in turn are transferred thence to the sheet to be printed that is fed between the blanket and the impression cylinder.
  • the clamping mechanism with which the present invention is particularly concerned is mounted in an axially extending gap or recess formed in the periphery of the master cylinder -10, FIG. 6.
  • This mechanism is described in more detail in Patent No. 2,813,482 and ineludes an elongated channel-like flange and support 21 of U-shape, the web of which is secured by bolts to one wall 23 of the gap in the master cylinder.
  • the upper one of the flanges or legs 25 of the support 21 extends axially of the cylinder and lies a short distance below the periphery thereof, and resultantly forms an anvil against which one end of a master printing plate or sheet may be clamped.
  • a plurality of plungers or pins 26 are mounted in spaced openings formed in the flange 25 for reciprocation in a direction normal to the flanges.
  • a thin disc-like clamping member 30 is secured to the upper end of each plunger :or pin 26, FIGS. 5 and 6. These clamping members lie above the upper flange 25 and are aligned in a row which extends axially of the 3 drum.
  • the clamping members 39 are individually biased toward the aforesaid anvil by springs 31, FIG. 6, which encircle the respective pins 26 and are interposed between the upper flange 25 of the support and respective split retaining rings mounted in annular recesses formed in the pins 26.
  • the present invention is particularly concerned with the clamping members 36 for the leading end of the printing plate and the mechanism for operating the same.
  • the clamping members 31 heretofore described, are moved to their sheet receiving or releasing position, by a common operating rod or bar 49 which bears on lower extensions of the plungers 26, FIG. 6, and this bar is actuated by a cam as will be described in detail.
  • the rod 40 extends axially of the master cylinder within the gap and underlies the inner or lower ends of the plungers 26.
  • the ends of the rod 40 are mounted in respective brackets 41 which are pivotally mounted on a shaft 42 rotatably journaled in the end plates of the master cylinder.
  • a pair of arms 43 is secured to the shaft 42 within the gap of the master cylinder and adjacent respective brackets 41 so as to move with the shaft when the latter is rocked in a manner to be explained.
  • each bracket 41 has an inturned lip 41L which overlies its respective arm 43 and carries an adjusting screw 415 which engages such arm to transmit counterclockwise movement of the shaft 42 to the brackets 41.
  • Each bracket 41 carries a pin 41F, FIGS. and 6, which extends freely through an enlarged opening 43A in its respective arm 43.
  • An enlarged washer is provided on the outer end of each such pin, and a plurality of discs 45 encircle the pin 411 between the Washer and the related arm 43.
  • At least one of these discs comprises a spring-like member which exerts an axial pressure on the arm 43 to thereby frictionally clutch the arm and bracket together for movement as a unit about the axis of the shaft 42, and yet permit adjustment of the position of the arm relative to the bracket by the adjusting screw 418.
  • a cam plate 46 which is one element for controlling the position of the clamping members 30 by actuation of the shaft 42 is fixed to the inside face of the frame member 11 of the printing machine.
  • This cam is positioned in the path of a pawl 47 pivotally mounted as at 48 on an arm 42A secured to one end of the shaft 42 which extends axially beyond the end of the cylinder which lies adjacent the cam 46.
  • a spring 478 normally holds the pawl 47 against a stop 42X carried by the arm 42A.
  • brackets 41 This movement of the brackets 41 causes the rod 4%), carried thereby, to lift the pins 26, raising their respective clamping members 30 out of contact with the anvil 25. In this position a previously clamped sheet is released for manual removal, and the clamping members 3t? are in position to receive another master sheet.
  • the master cylinder 10 is positioned as above described to open the clamps 30.
  • One end of a master sheet is placed on the anvil surface 25 with the adjacent edge thereof abutting the plungers 26 and the left band edge engaging a side guide as described in Patent No. 2,813,482.
  • the operator holds the sheet in such position and slowly rotates the cylinder to move the rod 40 away from the plungers 26 and permit the spring 31 to draw the clamping members 30 toward the anvil 25 and clamp the sheet positioned therebetween.
  • the latter movement of the cylinder may be in either direction, although the construction is such that it is more convenient to use a counterclockwise or printing movement.
  • the pawl 47 quickly disengages the cam 46 and the parts return to their normal positions.
  • Cam 46 it will be noted, includes a plurality of cam rises as 46A, and the reason for this is explained in Patent No. 2,813,482.
  • release of the clamps 30* is effected by means operable automatically after a predetermined number of prints or machine cycles. This is accomplished by providing arm 42A with a cam follower 66, FIG. 4, which is adapted to engage master clamp releasing means in the form of a rise R, FIG. 4, on a cam 70 when the rise 70R is in the dotted line position indicated in FIG. 4 which rep resents the position to which the cam .70 is moved or released after completion of the predetermined number of machine cycles, as will be described in detail below.
  • Cam 70 is pivotally located at the inside face of the frame plate 11 as shown in FIG. 1 and is in a predetermined plane.
  • Cam 7i) is under control of a latch 73, FIGS.
  • Latch 73 is normally unreleased, but the latch 73 in turn is under control of an arm 75 which'is located at the inside of frame plate 11A. Arm 75 is connected to the armature of a solenoid (not shown) which is associated with a counting mechanism which constitutes no part of the present invention.
  • the cam 70 is spring-biased to its normal or ineffective position shown in FIG. 4 as will be described in more detail hereinafter, and intermediate links are interposed between the cam 70 and the latch 73 substantially in the plane thereof in such a manner that the cam 70 will be forced to its dotted line position shown in FIG. 4 when the predetermined number of counts has been registered by the counting mechanism.
  • the latch and cam parts and connecting links which control automatic master plate release can be conveniently located inside a frame of an existing machine, such as that disclosed in the aforesaid patent, without any significant alterations.
  • the count controlled arm 75 is generally vertically extended and is formed with a flange 75A, FIG. 4, at the upper end thereof.
  • the flange 75A bears against a downwardly directed projection 73 formed on the releasing latch 73, and this condition is in part maintained by a spring 77 which is anchored at the lower end on a pin 75P fixed adjacent the lower end of the arm 75, and the upper end of the spring 77 is anchored on a pin 79 which is afiixed to the inside face of the frame plate 11A of the machine adjacent which the arm 75 is located.
  • Latch 73 is pivotally mounted on a supporting stud 81, FIGS. 1 and 4, which is atiixed to the inside face of frame plate 11A of the machine, and a spring 82, anchored at its lower end to a frame plate mounting pin 83 and anchored at its upper end to a pin 84 on the latch 73, is effective to bias the latch 73 downwardly as viewed in FIG. 4 so that firm contact is established between the latch projection 73F and the flange 75A of arm 75.
  • the latch 73 is generally crescent-shaped, and the pivot 81 is located near one end of the crescent.
  • the opposite end of the crescent-shaped latch 73 is formed with a notch '73N in which is normally located one corner of a lug 85E provided at the lower end of a relatively large bell crank 85.
  • This bell crank is carried on a shaft 86 which projects inward from the adjacent side plate 11A of the machine. Shaft 86 is arranged for limited rocking movement, for a purpose to be explained, when the latch 73 is released.
  • the bell crank is substantially in the plane of the cam 70, and the arm of the bell crank 85 opposite the arm which carries the projection 85B is provided with a pin 88.
  • a spring 911 is :aflixed to the pin 88, and the lower end of spring 90 is anchored on a pin 91 which projects inward from the side plate 11A of the machine which supports the stud 85 representing the fulcrum of the bell crank 85.
  • the spring 91 is effective normally to bias the bell crank 85 in a counterclockwise direction as viewed in FIG. 4.
  • the latch 73 and the bell crank 85 are substantially in the same plane, and this plane is also occupied by a relatively small bell crank 92 which serves as an intermediate link between the count controlled latch mechanism and the releasing cam 70.
  • the bell crank 92 is free to swing on a pivot stud 93 which is supported by the frame plate which supports the elements 81 and as.
  • the bell cranks are interconnected pivotally by a link plate 95 Winch is pivotally connected at the opposite ends thereof to the adjacent ends of the bell cranks 85 and 92 respectively by pins 96 and 97.
  • the end cf the bell crank 92 which is adjacent the end 79E of the clamp releasing cam 7 is extended thereunder to engage and lift this cam.
  • the releasing cam 70 is in the form of a relatively long arm as will be apparent from FIG. 4 and is pivoted, in- .termediate its ends, on a stud 105 which projects inwardly from the side plate 1J1 of the machine.
  • the cam arm 71 projects quite far to the left of the pivot 105 as will be apparent in FIG. 4 and is provided with a pin 166 at the left hand end 7 9L thereof.
  • One end of a spring 110 is anchored to this pin, and the opposite or upper end of the spring 111 is anchored on a lug 112L that is bent inwardly from one end of a plate :112 which is supported at the inside face of frame plate 11.
  • the plate 112 is provided with a guide arm 113, FIG. 4, which serves as a guiding support for cam 79.
  • the shaft 86 which carries the bell crank 85 projects outward of the adjacent frame plate .as shown in FIG. and an arm 1 15 is afiixed thereto at one end.
  • the opposite end of arm 115 is provided with a follower 115 which is disposed in the path of a cam 117, FIG. 3, that rotates with the blanket cylinder.
  • the cam is adjustable through a supporting eccentric b ushing 118, FIG. 3, and in each cycle of the machine the rise 117R of cam 117 nudges the follower 116.
  • FIG. 4 that the bell crank 85 is secured to shaft 86 by a clamp 120.
  • the clamp plate 121 bears against the flat bottom of a notch in shaft 86 and the bell crank 85 at its 6 mid-section has a crescent-shaped notch that embraces the lower half of shaft 86.
  • IBolts 121 secure the bell crank to the clamp and join both tightly to the shaft 86, and these bolts permit the bell crank to be rotatably .adjusted relative to shaft 86.
  • the master is stripped and initially guided away from the master cylinder toward the tray by three uniformly spaced stripper fingers 130, FIGS. 4, 8 and 9 which are in the form of relatively narrow blades. These fingers are normally held spaced away from the surface of the master cylinder in a non-stripping or retracted position as will be described below. Each is provided with an arcuate forward edge A which is curved complemental to the radius of curvature of the master cylinder. Each stripper finger includes an arcuate guide surcface 13113 at the back thereof which serves to guide the stripped master in the direction of the receiving tray, and the two surfaces 130A and 13GB merge into a relatively narrow point 131W which serves to afford the primary stripping action.
  • the stripper fingers 1311 are arranged in spaced relation on a support shaft 132 which extends between frame plates 11 and 12, and in this connection it should be pointed out that these frame plates at the left and right sides of the machine serve as mountings for the master cylinder bearings, other supporting members, the stub 1115 on which the releasing clamp 71 is pivoted and other parts hereinafter described.
  • each stripper blade at the lower edge thereof is formed with a half round opening 135, FIG. 8.
  • This opening is shaped complemental to a corresponding groove 132G, FIGS. 7 and 7A, formed at an appropriate location along the length of stripper fingers supporting shaft 132.
  • the stripper shaft 132 is formed with flat sunfaces 132F at the location of each groove 1326 and on the side thereof opposite the groove. Each such flat surface is shaped to receive a corresponding projection A, FIG. 8, provided on a retainer plate 140.
  • retainer plate :140 for each stripper finger 130, and each stripper finger is provided with a pair of studs 142, FIG.
  • each end of the stripper shaft is recessed inward for a substantial distance, and a coil spring 146 is mounted in an innermost pocket 147 of the stripper shaft, this pocket being of sufiicient depth and of reduced diameter to serve as a guide for the related spring 146.
  • a plunger 148 is. disposed at the outermost end of the recess at each end of the stripper support shaft 132, and its free outer end is formed with stud 1 53A which projects outwardly beyond the related terminal end of the stripper shaft 132.
  • One end of the coil spring 146 bears against the opposite end 1483 of the plunger 148 to exert an outwardly directed force on the plunger 148.
  • Each plunger 148 is provided :with a pin which is disposed in a slot 151 at the end of the stripper shaft 13?.
  • the plunger is first disposed in the pocket at the end of the stripper shaft, and thereafter the pin 159 is press fitted in place to serve as a stop limiting the extent to which the spring 146 presses the plunger 143 outwardly.
  • each plunger is adapted to fit in supporting elements that are provided on the inside faces of the frame plates 11 and 12.
  • stripper shaft 132 is in the nature of a rock shaft and is so controlled that the stripper fingers 13% are moved into stripping position when the releasing earn 7 has been shifted to its active position. However, so long as the clamp releasing cam is inactive, means are effective to hold the stripper fingers away from the master cylinder.
  • the stripper shaft has a bell crank 16%), FIGS. 6 and 7, aflixed to one end thereof. Gne arm 160A thereof is connected to the lower end of a spring 161 which has the upper end anchored to a pin 162 provided on a mounting plate 163 which in turn is secured to the inside face of the frame plate 12 at the side of the rn-a chine opposite the, clamp releasing cam 79.
  • the other arm 16GB of the bell crank 16% carries a follower roller 170, and this follower is disposed immediately opposite a stripper finger control cam 171, FIGS. 5 and 6.
  • This cam is in the form of a relatively large disc having a diameter slightly smaller than the master cylinder and is fixed to the master cylinder shaft to rotate therewith at the end of the master cylinder opposite the cam as shown in FIG. 5.
  • the cam 171 is formed with a depression 171D, FIG. 6, and the relationship is such that when the follower 1'70 is free to move into the depression 171D, this is accompanied by clockwise motion of the shaft 132, FIG.
  • the bell crank and its follower are normally held in an inactive or retracted position, and this is achieved by relating the action of the bell crank 168 to the action of the clamp releasing cam 70.
  • a release element in the form of an arm 175, FIGS. 6 and 7, is aflixed to the end of the tripper shaft 132 opposite the bell crank 160 so as to lie adjacent cam 76.
  • the release arm is provided with a rearwardly extending flange 176, and a stud 177, which has an end projecting free of the flange 176, is anchored therein.
  • the stud 177 is normally engaged by the toe 178 of a releasable stop which is freely pivoted on the end of the stripper shaft 132 on which the release arm 175 is aflixed, and it will be recognized that the spring 161, FIG. 6, is effective to hold the stud 177 against the opposed part 178 of the stop 180.
  • Stop 180 is provided with a pin 182, HG. 4, which is so located as to engage a shoulder 70A adjacent the rear portion of the clamp releasing cam 70*, and in this manner the clamp releasing cam 70 in its ineffective position serves the function of holding the stripper fingers in an inactive position.
  • the stripper fingers 131 ⁇ are effective on the leading edge of the master at a point somewhat below the bight between the surface of the master cylinder and the surface of a lower ink form roller 1%, FIG. 3, and during the course of initial stripping, the released master travels along the arcuate guide surfaces 136d? of the stripper fingers.
  • the flange 25, FIG. 6, is notched at three intervals 25G, FIG. 5, inward from the leading edge, and this enable the stripper fingers 130, in effect to get under the leading edge of the released master.
  • the separable attachment 2% is constructed to include a pair of side platesas 203 and 204, FIGS. 3 and 4, and these are rigidly connected by a pair of transverse tie bars 2% and 267, FIG. 4.
  • Each of the side plates 293 and 204 includes lower edges 208 that are disposed below the lower edges of the side plates 11 and 12 of the machine as will be evident in FIGS. 3 and 4, and each such side plates 203 and 204 includes upper surfaces 216 which, when the unit 200 is mounted in the machine, extend upward between the side plates 11 and 12.
  • Each pawl 215 fits in a groove at the forward end of the related plate 2%1 and is pivotally supported therein by a pin 216, FIG. 3 in the related groove.
  • Each pawl 215 includes a toe 215T which extends rearward of the pivot 216, and each pawl 215 is notched at 215N, FIG. 3.
  • the toe 215T of each pawl is en-gageable with a spring detent in the form of a spring-biased ball 218, FIG.
  • the spring detents are effective to supply a clockwise force to each pawl 215 as viewed in FIG. 3, and the notches 21SN are so located as to embrace a stud 2W5, FIG. 2, afiorded at each end of the transverse tie bar 297 which serves in part to rigidly connect the side plates 263 and 204.
  • each mounting bar or plate as 29 1 is formed with a slot 22%, FIGS. 1 and 3, at the rear edge thereof, and these slots are so located as to embrace studs 2865 at the ends of the tie bar 266.
  • the studs on the tie bar 2% are first aligned with the notches 221 and are fitted therein.
  • the unit 2% is then pivoted upwardly to cause the studs on the tie bar 267 to bear against the sloped or cammed edges 222 at the rear edges of the pawls 215, pivoting the pawls counterclockwise as viewed in FIGS. 3, and motion is continued until the tie bar studs 21978 are disposed in notched corners LES-1N, FIG. 3, at the forward edges of the mounting plates as 201.
  • the pawls 215 then spring back and have the shoulder 9 elements of the notches 215N thereof effectively engaged with the complemental stud parts of the tie bar 207 to hold the ejector unit 200 in place.
  • the unit 200 supports a plurality of guide elements that are associated with the stripper fingers so as to assure proper guiding relation of the master strip that is being removed from the master cylinder.
  • These guides include fingers 230, 'FIG. 4, which have lower arcuate surfaces 230A that are shaped complemental to the curved backs of the stripper fingers, and these guide surfaces are spaced slightly from one another as shown in FIG. 4 to define a guide throat through which passes the master being stripped.
  • each guide member 230 is formed at the top edge thereof with a circular notch 230N adapted to fit in a related groove 2316, FIG. 8, formed in the guide finger support shaft 231.
  • Shaft 231 it will be noted in FIG. 5, is sup ported at the opposite ends thereof in the side plates 203 and 204.
  • Each guide finger 230 is formed with an enlarged opening 233 intermediate the edges thereof, and this opening communicates with an opening 234 somewhat smaller in diameter.
  • the opening 234 of smaller diameter is proportioned to neatly fit in a groove in a shaft 235 arranged parallel to and somewhat below the shaft 231 in the unit 200, and the opening 233 is proportioned to enable shaft 235 to be inserted therethrough. After such insertion, the fingers 230 are shifted to produce a complemental fit between the edges of the openings 234 and the aforesaid grooves in shaft 235.
  • This assembly is then supported on shaft 231 by a pair of spring clips 240, FIGS.
  • each clip 240 is formed with a lower bight 240B adapted to fit in a like notch in shaft 235.
  • the parts are so dimensioned that the lower arcuate faces of the fingers 230 will be spaced slightly from the upper face of a lower guide plate 245 to define therewith a narrow passageway into which the stripped master is advanced.
  • a plate 245 of sheet metal is disposed below the lower curved edges of the guide fingers 230 as will be evident in FIG. 8, and this guide is so positioned and related as to cooperate with the fingers 230 in directing the stripped master into the bight of related ejector feed rollers 246 and 247 which are rearward of the guides 230.
  • the guide plate 245 is a removable element and has a rear portion thereof formed with a plurality of notches 245N as shown in FIG. 5. These notches embrace the rollers 247, and the solid or unnotched portions at the rear margin of the guide plate 245 overlie a shaft 248 which serves to support and drive the rollers 247 in a manner to be explained.
  • the guide plate 245 extends forwardly therefrom in an upwardly bent direction, and this relationship is maintained by disposing the forward edge portion of the guide plate 245 between pairs of slightly spaced studs 250 and 251, FIGS. and 8, these studs being afiixed to the inside faces of the plates 203' and 204. It will also be noted from FIG. 5 that the forward edge of the guide plate 245 is notched at 253 to enable the rear edges of the stripper fingers 130 to be freely active.
  • the guide plate 245 is so curved as to point the master being stripped into the bight of the related rollers 246 and 247 as was mentioned above. There are three rollers 246 as will be noted in FIG.
  • each is a steel roller formed with a boss 246B secured by a set screw to a supporting shaft 255 which is gear driven as will be explained.
  • the related rollers 247 are rubber rollers, and three of these 247A, 247B, and 2470, FIG. 5, are directly opposite and engaged with related ones of the three steel rollers 246. Additional ones of the rollers 247 are arranged between these three rollers 246.
  • the shaft 248 which carries the rubber rollers 247 is provided at the ends thereof with hearing supports 260, FIGS. 2 and 3, which have flat surfaces adapted to fit in slots 203$ formed in the side plates 203' and 204.
  • Relatively strong leaf springs as 261 are tensioned between a pair of studs 264 and 265 on each side plate as 203, and the forward end of each such spring is pressed downwardly to underlie and engage each bearing support as 260 to thereby apply a spring retaining force to the shaft 248 which supports the rollers 247.
  • Shaft 248 is provided with a gear 248G, FIGS. 2 and 4, which is driven by a gear 255G which is carried by shaft 255.
  • Gear 255G is located atone end of shaft 255.
  • a smaller gear 270, FIGS. 2 and 3, is secured to shaft 255 at the other end thereof, and this gear is meshed with an idler gear 271 which is in turn driven by a constantly rotating gear 273, FIG. 3.
  • rollers 246 and 247 serve to impart a withdrawing action to a stripped master, and this master is ejected by such rollers into the inclined receiving tray which is supported by the auxiliary or ejector unit 200.
  • the shaft 248 can be readily removed to enable the rollers 246 and 247 to be cleaned.
  • a used master is released and stripped automatically from the supporting cylinder in a cyclically operable off-set printing machine. This can be accomplished automatically as an incident to the attainment of a predetermined number of machine cycles, but of course a manual switch can also be provided to enable the solenoid having arm 75 to be energized selectively when desired.
  • the entailed mechanism can be conveniently added to an existing machine, since the operable master releasing parts for releasing the master clamps in such a machine are sorelated as to be neatly nested substantially in the same plane adjacent one of the frame plates of the machine.
  • the stripping action is positive and a forced ejection is used, but even so, stripping and ejection is accomplished without damaging the master.
  • the ejecting unit can be separably attached to an existing machine, and the arrangement in this unit is such that cleaning of the ejector rollers can be easily accomplished.
  • the form rollers and 191 are to be moved slightly away from the master cylinder during stripping of the master. This movement is only about 0.025 inch, sufiicient to prevent the master from wrapping around the lower form roller while permitting some lfOI'C- ing action of the lower form roller on the master being stripped, such forcing action being merely that due to a slight contact between the tacky form roller and the tacky image on the master as distinguished from a definite squeeze.
  • the form rollers are to be raised just prior to the opening of the clamps which hold the master on the master cylinder. This can be accomplished automatically in accordance with the disclosure in co-pending application, Serial No. 2,546, filed January 14, 1960; or, where only manual controls are "afforded, it can be done by turning the conventional eccentric mounts for the form rollers just prior to manually energizing the solenoid having arm 75 associated therewith.
  • 'oscillatable stripper mean-s adjacent the master cylinder and normally disposed in a position free of the path of the master, means to release the clamp, a cam for controlling the releasing means and normally disposed in an ineffective position, means for shifting the cam t0 an effective position after a predetermined number of prints have been made, means under control of said cam in its effective position to permit shifting of the stripper means into the path of the unclamped master to strip the unclamped master from the master cylinder, and a cam rotatable with the master cylinder to control oscillation of the stripper means between the eifective and ineifective position thereof.
  • oscillatable stripper means adjacent the master cylinder and normally disposed in an ineffective position free of the path of the master, means including a cam follower to release the clamp, a shiftable cam shiftable to an eiieotive position to be engaged by said cam follower for controlling the releasing means, said cam being normally in an ineffective position, means for shifting the cam to its effective position after a predetermined number of prints have been made, stripper releasing means under control of said cam in its inelfective position maintaining said stripper means in ineffective position and permitting movement of the stripper means to an effective position when said cam shifts to its eifective position, and a timing cam rotatable with said master cylinder to time operation of the stripper means to be-effective after the master has been released.
  • a releasable clamp including a spring biased plunger, oscillatable stripper means adjacent the master cylinder and normally disposed in an ineffective position free of the path of the master, clamp releasing means to exert a clamp opening force on said plunger to release the clamp and including a cam follower, a cam in a predetermined plane for controlling the clamp releasing means and normally in an ineffective position free of the path of the follower, means substantially in said plane for shifting the cam to its effective position into the path of said follower after a predetermined number of machine cycles, means under control of said cam in its ineffective position to prevent shifting of the stripper means and being released upon movement of the cam to its elfective position to permit movement of the stripper means into the path of the unclamped master to strip the unclamped master from the master cylinder, a cam rotatable with the master cylinder to time oscillation of the stripper means between the
  • a releasable clamp including a spring biased plunger disposed in a gap in the master cylinder, oscillat-able stripper fingers carried on a rock shatt adjacent the master cylinder and normally disposed in aposition free of the path of the master, said rock shaft having fixed thereto an arm with a cam follower thereon, spring means effective on said rock shaft to urge said fingers toward said master cylinder, clamp releasing means to exert a clamp opening force on said plunger to release the clamp and including another cam follower, a cam disposed in a predetermined plane for controlling the clamp releasing means and normally in an ineffective position free of the path of said followers, means substantially in said plane for shifting the cam to its effective position into the path of said other follower after a predetermined number of machine cycles, means substantially in said plane enabling said cam in its ineifective position to apply a force to said rock shaft opposing said spring means
  • a used master is to be stripped from the master cylinder by stripper fingers rendered active automatically as an incident to completion of a predetermined number of machine cycles
  • a main frame supporting said cylinder
  • an ejector unit including a pair of rigidly interconnected side plates, manually releasable means on said ejector unit for releasably attaching said unit to the main frame of the machine, a pair of spaced shafts rotatably supported between the side plates and respectively provided with feed rollers, a guide plate for the stripped master and located on one side of said feed rollers and adapted to guide the stripped master into the bight thereof, a receiving tray on the other side of the feed rollers to receive a master ejected by said feed rollers, and spaced guide fingers spaced above said guide plate and opposite said stripper fingers and defining therewith a narrow passageway leading from the master cylinder to the feed rollers.
  • a main frame supporting said cylinder an ejector unit including a pair of rigidly interconnected side plates, means on said unit enabling the same to be removably attached to the main frame of the machine, a pair of spaced shafts rotatably supported between the side plates and respectively provided with feed rollers, a guide plate for the stripped master on one side of said feedrollers and adapted to guide the stripped master into the bight thereof, a receiving tray on the other side of the feed rollers to receive a master ejected by said feed rollers, horizontally spaced guide fingers arranged above said guide plate and defining therewith a narrow passageway leading from the master cylinder to the feed rollers, and stripper fingers adjacent the master cylinder and having arcuate guide surfaces substantially aligned with said passageway to guide a stripped master accurately thereinto.
  • oscillatable stripper means adjacent the master cylinder and normally disposed in a position free of the path of the master, means to release the clamp, a cam for controlling the releasing means and normally disposed in an ineffective position, means for shifting the cam to an effective position after a predetermined number of prints have been made, means under control of said cam in its effective position to permit shifting of the stripper means into the path of the unclamped master to strip the unclamped master from the master cylinder, and timing means operative in synchronism with rotation of the master cylinder to control oscillation of the stripper means between the effective and ineifective position thereof.
  • a used master is to be stripped from the master cylinder by stripper fingers rendered active automatically as an incident to completion of a predetermined number of machine cycles
  • a main frame supporting said cylinder
  • an ejector unit including a pair of rigidly interconnected side plates, 21 pair of spaced shafts rotatably sup- 13 14 ported between the side plates and respectively provided References Cited in the file of this patent with feed rollers, a guide plate for the stripped master and UNITED STATES PATENTS located on one side of said feed rollers and adapted to guide the stripped master into the bight thereof, a receiv- E: &'; ing tray 0n the other side of the feed rollers to receive a 5 Comm) 1940 master ejected by said feed rollers, and spaced guide fin- 2:331:351 seeley 1943 gers spaced above said guide plate and opposite said strip- 2 3 0 744 Ford July 31 945 per fingers and defining there

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
US58399A 1960-09-26 1960-09-26 Master stripping means for rotary printing machines Expired - Lifetime US3095809A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US58399A US3095809A (en) 1960-09-26 1960-09-26 Master stripping means for rotary printing machines
GB31127/61A GB946357A (en) 1960-09-26 1961-08-29 Improvements relating to printing machines
BE608438A BE608438A (fr) 1960-09-26 1961-09-22 Machine imprimeuse.
FR874248A FR1301748A (fr) 1960-09-26 1961-09-26 Machines à imprimer
DEA38425A DE1180376B (de) 1960-09-26 1961-09-26 Druckfolienabstreifvorrichtung fuer eine Offsetdruckmaschine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US58399A US3095809A (en) 1960-09-26 1960-09-26 Master stripping means for rotary printing machines

Publications (1)

Publication Number Publication Date
US3095809A true US3095809A (en) 1963-07-02

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Application Number Title Priority Date Filing Date
US58399A Expired - Lifetime US3095809A (en) 1960-09-26 1960-09-26 Master stripping means for rotary printing machines

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US (1) US3095809A (de)
BE (1) BE608438A (de)
DE (1) DE1180376B (de)
GB (1) GB946357A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0070378A1 (de) * 1981-07-16 1983-01-26 Heidelberger Druckmaschinen Aktiengesellschaft Vorrichtung zum Halten des unteren Aufzuges eines zweilagigen Aufzuges auf der Mantelfläche eines Druckzylinders in Druckmaschinen

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9417273U1 (de) * 1994-11-01 1994-12-22 Spyra, Thomas, 71332 Waiblingen Schubboden in einer Zentrifuge

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1750587A (en) * 1927-04-16 1930-03-11 Fischer Ferdinand Offset-printing machine
US2034903A (en) * 1934-03-01 1936-03-24 Ditto Inc Duplicator
US2212659A (en) * 1939-08-30 1940-08-27 Ditto Inc Duplicating machine
US2331351A (en) * 1940-05-21 1943-10-12 American Sales Book Co Inc Unit feed printing machine
US2380744A (en) * 1942-06-24 1945-07-31 Ford Frank Ronald Duplicating machine
US2758539A (en) * 1951-08-08 1956-08-14 Ritzerfeld Wilhelm Sheet strippers for rotary duplicators
US2935937A (en) * 1957-10-29 1960-05-10 Davidson Corp Plate clamp for printing machine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE126260C (de) *
US2813482A (en) * 1954-12-20 1957-11-19 Addressograph Multigraph Clamp for master sheets of rotary printing machines

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1750587A (en) * 1927-04-16 1930-03-11 Fischer Ferdinand Offset-printing machine
US2034903A (en) * 1934-03-01 1936-03-24 Ditto Inc Duplicator
US2212659A (en) * 1939-08-30 1940-08-27 Ditto Inc Duplicating machine
US2331351A (en) * 1940-05-21 1943-10-12 American Sales Book Co Inc Unit feed printing machine
US2380744A (en) * 1942-06-24 1945-07-31 Ford Frank Ronald Duplicating machine
US2758539A (en) * 1951-08-08 1956-08-14 Ritzerfeld Wilhelm Sheet strippers for rotary duplicators
US2935937A (en) * 1957-10-29 1960-05-10 Davidson Corp Plate clamp for printing machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0070378A1 (de) * 1981-07-16 1983-01-26 Heidelberger Druckmaschinen Aktiengesellschaft Vorrichtung zum Halten des unteren Aufzuges eines zweilagigen Aufzuges auf der Mantelfläche eines Druckzylinders in Druckmaschinen

Also Published As

Publication number Publication date
GB946357A (en) 1964-01-15
BE608438A (fr) 1962-03-22
DE1180376B (de) 1964-10-29

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