US3095811A - Tension lockup for thin printing plates - Google Patents

Tension lockup for thin printing plates Download PDF

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Publication number
US3095811A
US3095811A US13263A US1326360A US3095811A US 3095811 A US3095811 A US 3095811A US 13263 A US13263 A US 13263A US 1326360 A US1326360 A US 1326360A US 3095811 A US3095811 A US 3095811A
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United States
Prior art keywords
cylinder
plate
spring
nibs
slot
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Expired - Lifetime
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US13263A
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English (en)
Inventor
Glenn R Peabody
Jr Louis S Tyma
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Miehle Goss Dexter Inc
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Miehle Goss Dexter Inc
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Publication date
Priority to FR809155A priority Critical patent/FR1239710A/fr
Priority to US850859A priority patent/US3062350A/en
Application filed by Miehle Goss Dexter Inc filed Critical Miehle Goss Dexter Inc
Priority to US13263A priority patent/US3095811A/en
Priority to GB7294/61A priority patent/GB911855A/en
Priority to DK98561AA priority patent/DK105479C/da
Priority to CH275161A priority patent/CH375736A/fr
Application granted granted Critical
Publication of US3095811A publication Critical patent/US3095811A/en
Anticipated expiration legal-status Critical
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B41F27/1218—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices
    • B41F27/125—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices moving in the printing plate end on a curvilinear path, e.g. by winding on a roll
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B41F27/1218—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices
    • B41F27/1225—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices moving in the printing plate end substantially rectilinearly
    • B41F27/1243—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices moving in the printing plate end substantially rectilinearly by pivotal or swivelling motion, e.g. by means of a rocking lever

Definitions

  • the present invention relates in general to the mounting or lockup of printing plates on printing cylinders, and, in particular, to the tensioned mounting of thin printing plates so that they will smoothly conform to the surface of the cylinder.
  • the dynamic tensioning arrangements utilize some yieldable, resilient elements, such as springs, to exert the tensioning force on the plate, so that if the latter stretches or shrinks the spring expands or contracts to maintain approximately the same tensioning force.
  • the dynamic tensioning arrangements have in the past been complex and expensive, employing means such as clamping jaws to engage the edges of a plate, the jaws in turn being movably mounted in the cylinder for adjustment, but engaged by biasing springs or the like.
  • a related object is to achieve a very simple mechanism for opening and closing spring elements which directly engage a printing plate, so as to afford application or removal of the plate to 'or from a cylinder.
  • Another object of the invention is to provide a tension lockup with a spring element carried by a cylinder and directly engageable with the thin printing plate, and further characterized by the provision for registering the position of the plate on the cylinder both with circumferential and skewing adjustments.
  • Still another object is to provide a tension lockup which readily accepts and properly tensions widely different kinds of flexible printing plates which have different physical properties, for example, metal and paper plates.
  • FIGURE 1 is an elevational view showing plates at- 3 ,'095,8 1 l Patented July 2, 1963 tached to a plate cylinder in accordance with the practice of the present invention
  • FIGS. 2 and 3 are end elevations, partially in section, taken substantially along the line 22 in FIG. 1 and respectively showing the plate-engaging elements in their plate unlocking and locking positions;
  • FIG. 4 is a fragmentary detail view taken in section substantially along the line 44 in FIG. 2;
  • FIG. 5 is a fragmentary detail view taken substantially along the line 55 in FIG. 1 and showing the rotational limits of an actuating shaft;
  • FIG. 6 is a fragmentary detail view taken in section substantially along the line 6-6 in FIG. 1 and showing the lockup components relaxed in the absence of a printing plate;
  • FIG. 7 is a progressively broken away section taken generally along the line 77 in FIG. 1, and showing the spring means in the unlocked condition for the application or removal of a printing plate;
  • FIG. 8 is similar to FIG. 7, but is further broken away in section and shows the lockup elements in locked engagement with a printing plate;
  • FIG. 9 is a perspective view of one section of the lockup spring on an enlarged scale
  • FIG. 10 is a perspective view of one-half of the springactuating member or cam shaft
  • FIGS. 11 and 12 are sectional views similar to FIGS. 7 and 8, but respectively illustrate the mechanism unlocked and locked in relation to a paper printing plate;
  • FIG. 13 is similar to FIG. 8, but illustrates an alternative embodiment of the invention.
  • aprinting cylinder 15 mount ing side-by-side printing plates 16 is journaled for rotation in frame members 18, 19 and is closely spaced to a second or blanket cylinder 20.
  • Each of the printing plates 16 is formed, for example, from a generally rectangular sheet of a very thin, flexible metal such as aluminum.
  • the thickness of these metal printing plates is on the order of 0.0065 inch to 0.015 inch, such plates being extremely flexible yet possessing relatively great tensile strength.
  • Other plate constructions, such as plastic backed by a thin metal sheet may, of course, be employed.
  • the invention is not limited to offset or planographic printing, it finds advantageous use in that particular field and will be described by way of example in the environment of an offset printing installation.
  • the image to be printed is applied to the surface of the printing plates 16 and the plates treated in a manner such that ink will not adhere to the blank areas but will adhere to the image areas.
  • An inking device (not shown) applies ink to the surface of the plate, and those portions or image areas of the plate to which the ink adheres transfer ink to a rubber blanket or the like on the blanket cylinder 20.
  • the ink is then transferred from the blanket to the paper web (not shown) to be printed.
  • the metal printing plates 16 are, in keeping with one feature of the invention, specially formed to cooperate with the tension lockup mechanism to be described. As illustrated best by FIGS. 7 and 8, the opposite edges of the plates 16 are both turned back away from the image side of the plate and through an angle of so as to form U-shaped channels 16a, 16b. Although the U-shaped channels in the opposed edges of the plates 16 may be constituted by smoothly curved reverse bends, it is preferable, as illustrated in FIGS. 7 and 8, that there be two successive bends of approximately 90, thereby forming a channel which has a width dimension 16c of approximately 0.015 inch, and which in depth 16d is approximately inch.
  • the plate mountingcylinder is provided with shaft portions "151: at either end, such shaft portions being received'in'suitable bearings carried by the frame members 18 and 19.
  • Drive gearing .22 may be disposed at one end 'tofrotation'ally-d-rive the cylinder 15 during printing runs.
  • the body of cylinder 15 is formed with a longitudinal slot .24 (FIG. 6) in the surface thereof. This slotextends the full length of the cylinder body and is defined "by a floor 24a (which is disposed substantially along a chord of the circular cross section ofthe cylinder) 'andby two side walls 24b which extend perpendicularly from the floor 24a to the mouth of the slot 24at-the surface of the cylinder.
  • one embodiment of the invention has been'built' and successfully tested with a cylinder body of 7 /2 inches in diameter, and in which the slot 24 ismade'is inchwide and 1% inches deep.
  • each springele'ment I6 is an integral or one-piece assembly generally U-shaped in cross section having a bight porti'onZGwan-d iopposedarm portions 26b and 260 which terminate in jaws or nibs 26d and 26a.
  • the spring ele- "ment 26 maybe formed from sheet stock of annealed spring steel. In one embodiment, this sheet stock is 0.015 inch thick.
  • the spring element'2 6 is formed so that the side portions'26c, 26b and the nibs 26d,2-6e are normally closely spaced rela'tive'to one another and are separated only by applying considerable force thereto. "When so-separated, the resiliency of the spring element 26 creates a-bias which tends to return the nibs 26a, 26d toward one another, that is, tendsto return them toward the relaxed positiongenerally illustrated in FIGS. 6 and 9.
  • the spring element 26 While the details of the construction of the spring element 26 may vary, that here shown has a plurality of spaced slots 26; cut out of the arm portion 26c. These slotsse'rve to equalize the biasing force, and also facilitate theinsertion of mounting screwsthrough theopposite arm portion 26b in a manner to be described below.
  • the nib 26d will be referred to hereinafter as the stationary nib and this is formed with -a reverse'bend so as to present a tip 26g which'extends substantially at 90 to the arm portion 26b.
  • the opposite or movable nib 26a is simply bent, inithe present instance, at 90 to the arm 26c, thus presenting a tip 26h which is adapted to enter one of the c'hannels1 6a, 16b in a printing plate '16.
  • the spring element 26 is, in the present instance, formed by a plurality of sections'each of which is individually mounted within the cylinder slot incnd-to-end relation with the other such sections therebyforming, in effect, one long spring 4; element. Manufacturing of the spring 26 is simplified by making is in sections.
  • a camming shaft 28 is located between and embraced by the spring arms 26b, 26c.
  • One-half of this camrning shaft 28 is illustrated in FIG. 10.
  • the shaft 2 it is required of the shaft 2 only that it be selectively movable between two positions, e.g., rotatable about its longitudinal axis between two angular positions, and that it have two different effective widths interposed between the spring arm portions when it is in the two positions.
  • the shaft 28 is generally circular in cross section but formed with a machined iiat 28a lying along a chord of its circular cross section.
  • the shaft '28 has a first relatively large width In (FIG. 8) formed by the full diameter thereof, and a second, narrower width n established by the chord surface 28a and the opposite side of the shaft.
  • the dimensional sizing of the shaft 28 is so chosen that when in the angular position illustrated by FIGS. 6 and 8 it is substantially free of the spring arm 26c, thereby permitting the latter to be relaxed in its norinal position.
  • the shaft 28 engages the arm 26c and spreads it against the resilient biasing force which is exerted "by'the spring 26 in tending to move the nibs 26c, 26d toward one another.
  • an elongated block 3%- which is substantially equal in length to the length of the body of cylinder 15 is disposed within the slot 24.
  • This block 3t) is, in the present instance, L shaped in cross section having a base 39a which is somewhat narrower than the width of the slot 24, thus leaving clearance spaces 31 (FIG. 6).
  • the spring elements 26 are firmly fixed to the block 3t) by suitable fastening elements which are here shown as a plurality of cap screws 32 inserted through openings formed in the arm 26b and threaded into tapped openings in the back portion 3%. With the spring element 26 so fixed to the block 353, the doubled-back nib 26d has its lower portion resting on and reinforced by the upper surface of the back portion 3%. It will be apparent that the arm 26b and the nib 26d are substantially stationary relative to the block 34 Thus, rotation of the shaft 28 to spread or relax the nibs 26d, 26:: will serve to move the latter nib between the two positions illustrated in FIGS. 6 and '7.
  • the shaft 28 is held substantially captive within the spring 26, but is journaled for rotation at its opposite ends in a manner which willnow be described.
  • the L-shaped block 39 is attached to plates 3 adjustably disposed'at the opposite ends of the cylinder 15.
  • the L-shaped block 30 at its ends carries two studs or dowel pins 35, 36 which fit tightly into holes in'the plates 34.
  • the end plates 34 are, in turn, adjustably secured to the cylinder by appropriate bolts 38 threaded into tapped holes in the ends of the cylinder, and passed through elongated openings or slots 39 (FIG. 7) in the plates.
  • Rigidly fixed to the ends of the cylinder 15 are collars 4% which rotatably journal ad- "justing screws '41 extending for threaded engagement into tapped openings 42 in the plates 34- (FIG. 7).
  • the adjusting screws 41 at the opposite ends of the cylinder 15 may be turned to move the end plates 34 back and forth along a chord of the circular cross section of the cylinder. If the screws are turned equal amounts, the end plates 34 will move equal distances and move the opposite ends of the L-shaped block or bar 30 transversely and equally within the slot 24, thus shifting both the spring nibs 26d, 262 along the surface of the cylinder 15, and changing the circumferential adjustment or register position of any printing plate which is held by those spring nibs.
  • the end plates 34 are provided with circular openings 44 (FIG. 7) through which the shaft 28 projects and in which that shaft is journaled.
  • the shaft 28 is provided with square or rectangular portions 28b (FIG. on which shaft control members 45 and 46 are engaged. As shown best in FIGS. 2, 3 and 5, the opposite squared end portions 28b of the shaft 28 are respectively received in squared openings cut in the members 45 and 46.
  • These control members 45 and 46 may take a variety of forms, and in the present instance are shown respectively as trapezoidal and triangular shaped metal plates. They provide means for rotating the shaft 28 between its two angular limit positions.
  • one of the two pins 35 and 36 which connect the L-shaped bar 30 to the end plates 34 is made long enough to extend considerably beyond the surface of the plate 34.
  • the pin 36 projects beyond the surface of the plate 34 and thus serves as a stop to limit rotation of the shaft control member 45 and the shaft 28.
  • the control member or plate 45 may be rotated between the two positions shown in FIGS. 2 and 3, thereby rocking the shaft 28 from the position shown in FIG. 7 to that shown in FIG. 8, the plate 45 engaging the pin 36 in both positions.
  • the triangularly shaped control member or plate 46 cooperates with the longer stop pin 36 at the other end of the cylinder 15. As illustrated in FIG. 5, as the shaft 28 rotates between the two positions illustrated by 'FIGS. 7 and 8, two corners of the triangular plate 46 engage the pin 36 to limit rotation of the shaft.
  • This limiting of the shaft rotation has two purposes. First, it makes certain that the shaft 28 is always turned in a counterclockwise direction to spread the spring nibs 260., 26c. Turning of the shaft counterclockwise from the position shown in FIG. 6 to the position shown in FIG. 7 has been found to eliminate possible damage to the spring 26 which might otherwise result from clockwise rotation. Secondly, the limiting of shaft rotation between two angular positions facilitates lockup of paper plates, as will be described below.
  • the head of the bolt 50 will be disposed in the path of the projection 51 as the cylinders 15 and 20 rotate in the directions indicated by arrows in FIG. 3.
  • the projection 51 hits and deflects the bolt 50.
  • the bolt 50 is deflected so that the control plate 45 and the shaft 28 rotate clockwise (as viewed in FIG. 3) with a snap-action and return the opened spring jaws to the closed position shown in FIG. 8, thus locking up the plate.
  • the cylinder 15 is rotated to an angular position in which the mouth of the slot 24 is readily accessible to the press operator.
  • the operator then hooks the leading channel 161) of the printing plate 16 over the tip 26g of the fixed spring nib 26d.
  • the plate is held firmly against this nib while the cylinder 15 is rotated a full turn in a counterclockwise direction as viewed in FIG. 2.
  • the shaft 28 Prior to engagement of the trailing end of the printing plate with the movable spring nib 26e and subsequent to rotation of the cylinder 15 to wrap the plate onto the cylinder surface, the shaft 28 is rotated to the position illustrated in FIG. 7, thereby spreading the spring nibs 26d, 26:: against the biasing spring force.
  • the channel 16a at the other end of the plate 16 can be placed over the movable spring nib 262. Then, the cylinder 15 is further rotated until the projection 51 strikes the bolt 50 (as shown in dotted lines by FIG. 3), and the shaft 28 by this arrangement returns to the position illustrated in FIG. 8, in which the spring nib 26e is resiliently biased into the channel 16a, taking up the slack in the plate 16 and tensioning it around the surface of the cylinder 15. This automatically triggered engagement of the spring 26 occurs when the adjacent cylinder 20 is holding the trailing end of the plate, over the whole cylinder length, firmly in position to be engaged by the nib 262.
  • the automatic release of the spring 26 can be omitted by removing the bolt 50, and the control plate 45 simply rotated by hand from an unlocked to a locked position to rotate the shaft 28 from unlocked to locked positions or vice versa. This can also be done by means of a wrench engaging the squared ends 28b of shaft 28, which extends beyond plates 45 and 46.
  • the position of the block 30 both transversely and skewingly within the slot 24 may be adjusted by turning the adjustment screws 41 either equally or differentially. In this manner, the circumferential or skewed registered position of the printing plate can be changed and corrected.
  • paper printing plates are considerably less expensive than metal plates, and may be used for short runs, i.e., up to about 10,000 impressions. These paper plates are on the order of 0.0125 inch in thickness and their tensile strength is obviously less than that :of thin metal plates.
  • the cylinder 15 and associated lockup mechanism are there shown as mount ing and locking up a paper plate 55.
  • the leading edge of this plate is bent back upon itself through 180 to form a U-shaped channel 55a about inch deep, the latter being adapted to hook over and engage the stationary spring nib 260? in the same manner as the metal plate channel 16b, previously described.
  • the paper plate 55 is made somewhat longer than the metal plate 16, and its trailing edge is formed with a tab 55b which is bent inwardly or away from the image surface through an angle of only about 90.
  • the channel 55a may be first hooked over the stationary spring nib 26d, and the spring jaws then spread apart by setting the shaft 28 to the angular position shown in FIG. 11.
  • the plate 55 may then be wrapped around the surface of the cylinder 15 in the same manner as previously described for metal plates and the inturned tab 551) at the opposite end of the plate insorted through the slot 24 and into the shaft slot 28d.
  • the shaft 28 is next rotated from its unlocking to its locking position (i.e., from the position shown in FIG. 11 to that shown in FIG. 12)
  • the paper plate 55 will be tensioned both by a slight wrapping around the shaft 28 and by the movement of the nib Zoe toward the stationary nib 26d.
  • the paper plate is placed under firm tension and held tightly on the surface of the cylin-' der 15.
  • FIG. 13 is similar to FIG. 8 but illustrates an alternative construction in which the two plate-engaging nibs or jaws are not formed on a one-piece spring element.
  • the stationary nib 26a! is formed as a. flat strip fixed, by suitable means such as screws 60 directly to the upper surface of the L-shaped block 30' which is disposed in the slot 24' of the cylinder 15'.
  • the nib 26d is thus disposed adjacent the surface of the cylinder and is adapted to enter and engage the channel 16b in the plate 16'.
  • the movable nib 26s isfixed, by appropriate means such as Welding (not shown), to the upper end of a spring plate or arm 260 which has its lower portion fastened, as by screws 61, to the base 30a of the block 30'.
  • Welding (not shown)
  • the spring arm tends to move the nib 26c to a position adjacent the nib 26d, the biasing action tensioning the plate 16' which has its channel slipped over and engaged with the nib Me.
  • the two nibs may be spread apart, however, by rotation of the cam shaft 28' to bring its full diameter to bear between the arm 26c' and the back portion 30b of the block 30.
  • the back portion 30b in effect forms one arm (corresponding to the arm 26b in FIG. 6) of a composite spring element
  • the base 30a of the block in effect forms the bight portion (corresponding to the bight 26a in FIG. 6) of a composite spring element.
  • a printing cylinder having a longitudinal slot in the surface thereof, a thin printing plate adapted to be conformed to and supported by the surface of said cylinder, said plate having channels formed along its opposite edges, an elongated spring of generally U shaped cross section having a bight disposed in the lower portion of said slot defining arm portions and having nibs adjacent the surface of said cylinder, a plurality of fastening elements engaging one arm portion of said spring so as to anchor the spring in said slot
  • said nibs on said one arm portion being fixed and the nibs on the other arm portion being flexibly supported by the full extent of said bight, said nibs being formed to enter said channels on the opposed edges-of said plate as such nibs are moved toward one another, said spring being formed such that said nibs are normally closely spaced from one another and when moved apart are biased toward one another, and a cam shaft embraced by said arm portions of said spring and rotatable to spread or relax said nibs.
  • a printing cylinder having a longitudinal slot in the surface thereof, a thin, flexible printing plate conformed to and supported on the surface of said cylinder, said plate bent back approximately at its opposite edges to form narrow channels which open in opposite directions when the plate is disposed on said cylinder, an elongated spring of generally U-shaped cross section disposed in said slot with nibs adjacent the entrance to said slot, each of said nibs being disposed inwardly at about 90 from the body of the spring to form oppossed tips extending substantially in a direction circumferential of the cylinder, a fastening element engaging said spring near the tips at one end of said U-shape so as to anchor the spring in said slot, said spring being formed such that said tips are normally closely spaced and when spread apart are biased toward one another, said tips being sized to enter respective ones of said channels in said plate and thereby hold the latter under tension on the cylinder surface, and means for spreading said nibs apart when said plate is to be placed on or removed from said cylinder.
  • a printing cylinder having a longitudinal slot in the surface thereof, a thin, flexible printing plate disposed on the surface of said cylinder, said plate being bent back at its opposite edges to form channels which open in opposite directions when the plate is disposed on said cylinder, an elongated spring of generally U-shaped cross section disposed in said slot with nibs adjacent the entrance to said slot, a fastening element engaging said spring near the tips at one end of said U- shape so as to anchor the spring in said slot, said spring being formed such that the nibs are normally closely spaced and when spread apart are biased toward one another, said nibs being formed to enter respective ones of said channels in said plate and thereby hold the latter under tension on the cylinder surface, and a cam shaft embraced by said spring and rotatable between two angular positions, said cam shaft having two effective widths to spread or relax said spring when it is in respective ones of said positions.
  • a printing cylinder having a longitudinal slot cut in the surface thereof, a flexible printing plate slightly less in length than the circumference of said cylinder and having channels formed along its opposite edges, a block undersize relative to said slot and disposed for shifting movement therein, a one-piece spring of U-shaped cross section fixed to said block and having nibs adjacent the cylinder surface, said nibs being normally adjacent each other and biased toward one another when separated, said nibs being engageable with said channels to tension said plate on the surface of said cylinder, means carried by said block for spreading and relaxing said nibs to provide for releasing or engaging said nibs with said channels and thus to afford the application or removal of a plate to or from said cylinder, means for anchoring each end of said block to said cylinder while afiording adjustment of each such end in a direction transverse to the lengthwise dimension of said slot, so that the position of said plate on the cylinder may be circumferentially and skewingly adjusted.
  • a printing cylinder having a longitudinal slot cut in the surface thereof, a flexible printing plate supported on the surface of said cylinder and having channels formed along its opposite edges, an elongate block of L-shaped cross section and having a base undersize relative to said slot and disposed for shifting movement therein, a one-piece spring of U-shaped 10 cross section having two arm portions turned inwardly at their ends to form nibs, means fixing one of said arm portions to said block so that said nibs are adjacent the cylinder surface, said nibs being normally adjacent each other and biased toward one another when separated, said nibs 'being engageable with said channels to hold and tension said plate on the surface of said cylinder, means disposed 'between the arm portions of said spring to place said nibs in adjacent or separated positions to hold :a plate in circumferential tension or to afford the application or removal of a plate to or from said cylinder, means for anchoring each end of said block to said cylinder while affording adjustment of each such end in a direction transverse to the lengthwise dimension of said slot, so that
  • a printing cylinder having a longitudinal slot cut in the surface thereof, a flexible printing plate slightly less in length than the circumference of said cylinder and having channels formed along its opposite edges, a block undersize relative to said slot and disposed for shifting movement therein, a spring assembly of generally U-shaped cross section carried by said block and having nibs adjacent the cylinder surface, said nibs being normally adjacent each other and biased toward one another when separated, said nibs being engageable with said channels to hold and tension said plate on the surface of said cylinder, means carried by said block for spreading and releasing said nibs to afford the application or removal of a plate to or from said cylinder, a plate at each end of said cylinder and connected to one end of said block, and means for adjusting the position of each said plate in a direction transverse to the lengthwise dimension of said slot, so that the position of said plate on the cylinder may be circum-ferentially and skewingly adjusted.
  • a lockup for thin printing plates comprising first and second cylinders rotatable sub stantially in surface contact, said first cylinder having a longitudinal slot in its surface, a spring assembly of generally U-shaped cross section disposed in said slot with its nibs adjacent the mouth of the slot, said spring assembly being formed so that the nibs normally are closely spaced and are biased toward one another when separated, a cam shaft embraced by said spring assembly and having two effective diameters so that rotation thereof between two angular positions spreads said nibs or allows them to relax into :a normal position, a projection on said second cylinder, and means deflected by said projection when said shaft is in its nib-spreading position to rock said shaft to its nib-relaxing position, said projection and said last-named means being located to effect rocking of said shaft when the said slot is in an angular position just reaching the point of tangency with said second cylinder.
  • a lockup for holding under tension flexible printing plates having tab ends of the kinds described comprising a cylinder having a longitudinal slot in its surface, a spring of generally U-shaped cross section disposed in said slot with nibs adjacent the mouth of the slot, said spring being formed so that the nibs normally are closely spaced and are biased toward one another when separated, a cam shaft embraced by said spring and having two effective diameters so that rotation thereof between two angular positions spreads or relaxes said nibs, and said shaft being formed with a longitudinal slot therein adapted to receive a tab end of a printing plate when the shaft is in its nib-spreading position.
  • a thin plate turned back at its opposite edges to have U-shaped channels therealong, or second, a thin plate turned back at one end to form a U-shaped channel and turned less than at the other end to form a tab
  • the combination comprising a cylinder having a longitudinal slot formed in its surface, a U-shaped spring assembly disposed in said slot and having nibs adjacent the slot mouth and which are biased toward one another, said nibs being turned inwardly to enter the edge channels of a first plate, a cam shaft rotatably disposed within said spring assembly and having angularly spaced thin and thick cross sectional portions to relax said spring assembly or to spread said nibs apartwhen such shaft is turned to first or second angular positions, and said shaft having a longitudinal slot therein oriented when said shaftis in said second position to receive the tab of a secondplate having its channel engaged ,with one of said nibs, so that (rotation of said shaft .tensions the second 15 plate on the cylinder.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
US13263A 1958-11-06 1960-03-07 Tension lockup for thin printing plates Expired - Lifetime US3095811A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
FR809155A FR1239710A (fr) 1958-11-06 1959-11-03 Machine à écrire
US850859A US3062350A (en) 1958-11-06 1959-11-04 Typewriter for manual or electric actuation
US13263A US3095811A (en) 1960-03-07 1960-03-07 Tension lockup for thin printing plates
GB7294/61A GB911855A (en) 1960-03-07 1961-02-28 Tension lock-up for thin printing plates
DK98561AA DK105479C (da) 1960-03-07 1961-03-06 Spænde- og låsemekanisme til fastgørelse af tynde trykplader på en trykkecylinder, samt trykplade til samvirken med mekanismen.
CH275161A CH375736A (fr) 1958-11-06 1961-03-07 Dispositif de fixation d'un cliché sur un cylindre d'impression

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US13263A US3095811A (en) 1960-03-07 1960-03-07 Tension lockup for thin printing plates

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US3095811A true US3095811A (en) 1963-07-02

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US13263A Expired - Lifetime US3095811A (en) 1958-11-06 1960-03-07 Tension lockup for thin printing plates

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DK (1) DK105479C (da)
GB (1) GB911855A (da)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3410211A (en) * 1964-10-26 1968-11-12 Winkler Fallert & Co Maschf Printing cylinder clamp for tensioning flexible printing plates
US3425348A (en) * 1966-03-21 1969-02-04 Miehle Goss Dexter Inc Clamping arrangement for blanket in printing press
US3603255A (en) * 1968-06-24 1971-09-07 Wood Industries Inc Saddle clamping device
US3608487A (en) * 1969-08-27 1971-09-28 Harris Intertype Corp Flexible plate clamping assembly including inwardly bowed spring and movable jaw
US3626848A (en) * 1969-06-09 1971-12-14 American Rockwell Corp Lockup for thin plates
US3757691A (en) * 1972-06-12 1973-09-11 North American Rockwell Printing cylinder
USB351939I5 (da) * 1972-05-23 1975-01-28
US4191106A (en) * 1975-12-01 1980-03-04 K and Manufacturing Company, Inc. Printing plate clamping assembly
US4802413A (en) * 1986-07-11 1989-02-07 Hercules Incorporated Printing plate securing
US4890555A (en) * 1987-06-03 1990-01-02 Motter Printing Press Co. Printing press plate lockup
EP1314559A1 (en) * 2001-11-27 2003-05-28 Kabushiki Kaisha Tokyo Kikai Seisakusho Plate cylinder and printing plate holder for the cylinder
US20080047446A1 (en) * 2006-08-22 2008-02-28 Goss International Montataire Sa Printing plate and corresponding printing assembly

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GB838885A (en) * 1957-11-07 1960-06-22 Ernest Arthur Timson Improvements relating to printing machine cylinders
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US1905344A (en) * 1930-12-22 1933-04-25 Multigraph Co Printing apparatus
US1897148A (en) * 1931-04-07 1933-02-14 Multigraph Co Transfer blanket for offset printing
US2021894A (en) * 1933-12-28 1935-11-26 Multigraph Co Device for attaching printing members on drums
US2121309A (en) * 1935-03-28 1938-06-21 Standard Process Corp Rotary printing press
US2296533A (en) * 1939-04-07 1942-09-22 Ditto Inc Flexible plate mounting means for duplicating machines
US2265005A (en) * 1940-08-16 1941-12-02 Printing mechanism
US2450617A (en) * 1946-01-25 1948-10-05 Smith Joseph Leigh Buffing drum
US2850970A (en) * 1955-04-22 1958-09-09 Levey Fred K H Co Inc Lock-up
US3012841A (en) * 1956-01-13 1961-12-12 Fairchild Camera Instr Co Sheet cylinder for image reproducing machines
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US2979372A (en) * 1958-12-09 1961-04-11 Westrex Corp Record clamping and stripping mechanisms for facsimile machines and the like

Cited By (17)

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US3410211A (en) * 1964-10-26 1968-11-12 Winkler Fallert & Co Maschf Printing cylinder clamp for tensioning flexible printing plates
US3425348A (en) * 1966-03-21 1969-02-04 Miehle Goss Dexter Inc Clamping arrangement for blanket in printing press
DE1561018B1 (de) * 1966-03-21 1970-12-23 Miehle Goss Dexter Inc Spannvorrichtung zum Befestigen eines bogenfoermigen Teiles,beispielsweise eines Drucktuches,an einem Druckmaschinenzylinder
US3603255A (en) * 1968-06-24 1971-09-07 Wood Industries Inc Saddle clamping device
US3626848A (en) * 1969-06-09 1971-12-14 American Rockwell Corp Lockup for thin plates
US3608487A (en) * 1969-08-27 1971-09-28 Harris Intertype Corp Flexible plate clamping assembly including inwardly bowed spring and movable jaw
US3913480A (en) * 1972-05-23 1975-10-21 Koenig & Bauer Ag Device for locking up flexible printing plates on forme cylinders of printing presses
USB351939I5 (da) * 1972-05-23 1975-01-28
US3757691A (en) * 1972-06-12 1973-09-11 North American Rockwell Printing cylinder
US4191106A (en) * 1975-12-01 1980-03-04 K and Manufacturing Company, Inc. Printing plate clamping assembly
US4802413A (en) * 1986-07-11 1989-02-07 Hercules Incorporated Printing plate securing
US4890555A (en) * 1987-06-03 1990-01-02 Motter Printing Press Co. Printing press plate lockup
EP1314559A1 (en) * 2001-11-27 2003-05-28 Kabushiki Kaisha Tokyo Kikai Seisakusho Plate cylinder and printing plate holder for the cylinder
US20030097946A1 (en) * 2001-11-27 2003-05-29 Takanobu Kawabata Plate cylinder and printing plate holder for the cylinder
US6840173B2 (en) * 2001-11-27 2005-01-11 Kabushiki Kaisha Tokyo Kikai Seisakusho Plate cylinder and printing plate holder for the cylinder
US20080047446A1 (en) * 2006-08-22 2008-02-28 Goss International Montataire Sa Printing plate and corresponding printing assembly
US7748319B2 (en) * 2006-08-22 2010-07-06 Goss International Montataire Sa Printing assembly including a plate holding device

Also Published As

Publication number Publication date
DK105479C (da) 1966-10-03
GB911855A (en) 1962-11-28

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