US3425348A - Clamping arrangement for blanket in printing press - Google Patents

Clamping arrangement for blanket in printing press Download PDF

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Publication number
US3425348A
US3425348A US536122A US3425348DA US3425348A US 3425348 A US3425348 A US 3425348A US 536122 A US536122 A US 536122A US 3425348D A US3425348D A US 3425348DA US 3425348 A US3425348 A US 3425348A
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US
United States
Prior art keywords
blanket
springs
clamping
spring
sides
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US536122A
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English (en)
Inventor
Carl J Hermach
Leonard Tafel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Miehle Goss Dexter Inc
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Miehle Goss Dexter Inc
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Publication date
Application filed by Miehle Goss Dexter Inc filed Critical Miehle Goss Dexter Inc
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Publication of US3425348A publication Critical patent/US3425348A/en
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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
    • 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
    • B41F27/1237—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 translatory motion substantially perpendicular to support surface
    • 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
    • B41F27/1262—Devices for attaching printing elements or formes to supports for attaching flexible printing formes without tensioning means

Definitions

  • a clamping arrangement for clamping a blanket in an undercut groove in a printing press cylinder which employs longitudinally extending springs for clamping the ends of the blanket against the undercut surfaces with a central cam shaft for selectively activating the springs. The springs are bowed to produce automatic takeup of a blanket as the press is run.
  • the present invention relates to printing presses and more particularly to means for clamping a blanket on a cylinder in a printing press.
  • a clamping arrangement which is easily operated, with release at the respective ends being obtained simply by throwing an operating member in one direction or the other from a central clamping position in which the operating member is locked during normal running of the press, with a substantial reduction in the time required to change a blanket.
  • FIGURE 1 is a typical section, partially fragmentary, and at reduced scale, of a clamping assembly constructed in accordance with the present invention mounted in an impression cylinder.
  • FIG. 2 is a side elevation, foreshortened and with a portion broken away, of the clamp assembly shown in FIG. 1;
  • FIG. 3 is a face view of the assembly, also foreshortened
  • FIG. 4 is an enlarged end view corresponding to FIGS. 2 and 3 but with the locking plate removed;
  • HG. 4a is an enlarged section of the cam shaft showing the relief and adjacent camming surfaces
  • FIGS. 5a5c are stop motion views showing a typical clamping sequence
  • FIG. 6 shows a typical tooth on one of the clamping springs
  • FIG. 7 shows, at reduced scale, the profile of the locking plate
  • FIG. 8 is a diagram showing the take-up which occurs during the clamping movement
  • FIG. 9 is a fragmentary section showing a modified construction providing constant take-up.
  • FIGURE 1 shows a clamping assembly 10 recessed in a groove 11 formed in a reversible impression cylinder 12 having a shaft 13.
  • the cylinder is covered with a paper blanket 15 having ends 16, 17 which are securely gripped by means to be described.
  • the impression cylinder 12 normally cooperates with a plate cylinder (not shown) against which it bears to serve as a backup for the web being printed.
  • the clamping assembly 10 includes a block or body 20 preferably in the form of a casting having sides 21, 22 and a bottom 23 defining a central cavity 24. Forming a continuation of the surface of the cylinder are arcuate surfaces 25, 26 separated by an access slot 27. To facilitate manufacture and to lighten the construction, the body is formed with openings 28, 29 which may be spaced at equal intervals along the length. For the purpose of fastening the body in place in its receiving groove in the cylinder, a series of cap screws 30 are provided. Such screws may be inserted prior to installing the assembly in the cylinder, and the screws may be subsequently tightened by a wrench inserted through the access slot, the slot having minor relief for this purpose as indicated at 31.
  • the sides of the body are undercut adjacent the slot to provide a pair of longitudinally-extending blanket-seating surfaces 35, 36 with coextensive clamping elements in the form of springs having an adjacent cam shaft for pressing the springs mutually outward to grip the ends of the blanket.
  • a spring is used having two sides, said sides being formed into U shape defining a central space which is almost completely occupied by the cam shaft.
  • the spring 40 is preferably formed of flat spring stock bent into the shape shown and with teeth in the form of a pattern of struck-out trangular projections 47 (see FIG. 6). Such spring is hardened to the desired degree, with the individual teeth being sharpened, following the hardening with a suitable grinding tool 48.
  • the spring may be formed of AISI C 1095 spring steel having a thickness of approximately 0.04 inch hardened to a hardness of 50-55 on the Rockwell C scale with the teeth preferably having a height on the order of 0.05 inch with a lateral spacing on the order of %th inch.
  • the spring is secured to the bottom of the cavity 24 by a central row of machine screws 52.
  • each gripping surface is biased away from the seating surface with which it cooperates.
  • the free ends of the spring prior to installation press against one another.
  • the length of each spring may be on the order of four inches to, say, ten inches, but since each spring is acted upon uniformly, as will be discussed, the average gripping force is substantially the same at each point along the length of the cylinder.
  • a spring operator in the form of a cam shaft extends centrally through the springs 40 over the entire length of the cylinder, the cam shaft being relieved along one side thereof to define camming surfaces which press outwardly in opposite directions against the spring sides when in a central, reference position to clamp the ends of the blanket under normal running conditions, with the cam shaft being mounted for limited rocking movement in opposite directions from the reference position for selective release of the gripping surfaces at the ends of the blanket.
  • a cam shaft 60 is used having camming surfaces 61, 62 which are defined by a relief 63 which extends, in the present instance, a little less than half way about the shaft.
  • the shaft thus may be conveniently formed from a circular steel rod by machining away the material within the dot-dash outline in FIG. 4a.
  • the ends of the shaft are received in openings formed in end plates 71, 72 which are secured to the ends of the clamp body by machine screws 73.
  • Interposed bushings 74, 75 may be employed to avoid wear at the engaged surfaces.
  • the shaft is formed with a faceted, preferably square, end 76 engageable by a suitable wrench.
  • the locking member (see FIG. 7) is in the form of a spring plate 77 having a conforming recess 78 and secured to the body of the clamp by cap screws or the like 79, the plate being simply pressed clear of the end by the wrench. It is preferred to use an opening 78 which is semi-square so that the locking plate engages the end of the shaft without completely surrounding it.
  • the cam shaft When the blanket is bodily adjusted so that it is straight 4 on the cylinder, the cam shaft is rotated through an angle on the order of 130 so that it occupies the position shown in FIG. 5b in which the relief on the shaft faces the other side of the springs, side 41, corresponding to the trailing edge 17 of the blanket. It may be noted that during the rotation of the shaft from the condition shown in FIG. 5a to that shown in FIG. 5b clamping pressure is first applied, and then maintained, by the teeth of the gripping surface 46 upon the leading edge 16 of the blanket.
  • the trailing edge 17 of the blanket is inserted through the slot 27 as far as possible and the press may be inched forward at slow speed to iron out any slack which may exist in the blanket so that the latter will lie tightly on the cylinder surface.
  • the cam shaft 60 may then be restored, as in FIG. 50, to its central reference position in which the cam surface 61 is rocked against the spring sides 41 causing the gripping surface 45 to be forced down into gripping engagement with the trailing edge of the blanket.
  • the spring sides are not only bowed in their original state but the camming surfaces extend to a radial height indicated at r in FIG. 8 which is greater than that required to bring the gripping surfaces into engagement and which is, indeed, sufiicient to increase the curvature of the spring sides from that indicated at to that indicated at 81.
  • Such increase in curvature produces translational movement of the gripping surface in a direction to tension the blanket.
  • impression cylinders equipped with the present clamping assembly can be operated for long periods at the highest printing press speeds with complete security and safety.
  • the cam shaft may simply be cycled through the sequence set forth in FIGS. 5a-5c, so that the teeth acquire a new grip on the ends of the blanket, while manually urging the end of the blanket into the slot.
  • the modification shown in FIG. 9 may be used in which an auxiliary spring is interposed between the cam and the adjacent clamping spring capable of a small amount of continuous take-up.
  • a bar 90 may be used registering in a groove 91 and preferably formed in sections registering with the clamping springs, with the sections being pressed outwardly by springs 92 seated in the bottom of the groove.
  • Such springs may, for example, be in the form of a series of closely spaced coil springs or may be in the form of a single or sectional wave spring extending the length of the cam shaft.
  • a similar set of take-up elements 90-92 are used on the opposite side of the shaft.
  • the interposed springs may take the form of an inner laminate on springs 41, 42.
  • the auxiliary springs are of such strength or stiffness as to be capable of incrementally bowing the adjacent clamping springs.
  • the clamping arrangement is perfectly symmetrical so that all of the forces are balanced. Since the force vectors indicated in FIG. 5c are equal and opposite, there is no tendency for the shaft to bow or for the spring to cock bodily about its base or region of anchoring. Thus it sufiices to have a relatively narrow base portion 43 which is held in engagement with the bottom of the clamp body by means of a single row of light duty machine screws, the narrow base making it possible to utilize substantially the entire length of each side of the spring for flexing action.
  • the spring clamping sides 41, 42 being bowed in U configuration, provide an elliptical inner space which is substantially filled by the cam shaft, thus permitting a high degree of compactness and enabling the body of the device to be substantially smaller in cross section than has been possible in the past.
  • each of the springs serves as a guide for the respective entering edges of the blanket, and because of the provision for wrench clearance along the edge of the slot, such edges may be brought together much more closely than has been possible with prior designs so that substantially the entire cylinder circumference is blanketed.
  • each of the springs 40 may, if desired, be of laminated construction.
  • impression cylinder for a printing press
  • the invention is not necessarily limited thereto and may be used wherever it is desired to secure a thin sheet to the surface of a rotating cylinder. Consequently it is intended that the terms impression cylinder and blanket be interpreted in a generic sense to cover any cylinder in a printing press having a covering sheet. It will also be understood that a plurality of clamping assemblies may be spaced about the cylinder periphery.
  • a clamp ing assembly having an elongated body fitted in the groove including sides defining a longitudinally extending cavity having a narrow access slot at the center, said sides being undercut adjacent the slot to provide a pair of internal longitudinally extending surfaces for seating the edges of a blanket, a pair of longitudinally extending springs secured to the bottom of the cavity having blanket engaging surfaces along the free edges thereof arranged opposite the seating surfaces, and a control member in the form of a rockable cam shaft centered between the springs and relieved to define opposed camming surfaces so that when the shaft occupies a central reference position the springs are pressed along their lengths into blanket-clamping engagement with the seating surfaces, the springs being inwardly sprung toward the cam shaft so that when the cam shaft is rocked in one direction 01: the other from its reference position a selected one of the springs is released for insertion of an end of the blanket.
  • a clamping assembly having an elongated body fitted in the groove including sides defining a longitudinally extending cavity having a narrow access slot at the center, the sides of the body being undercut adjacent the slot to provide a pair of longitudinally extending surfaces for seating the edges of a blanket, a plurality of longitudinally extending U-shaped springs secured end to end to the bottom of the cavity and having blanket-gripping surfaces along the free edges thereof in opposed relation to the respective seating surfaces, said springs being outwardly bowed to define a central space, and means including a control member extending longitudinally in central position in the space for bearing upon the central portion of the springs for urging them into blanket-clamping engagement with the seating surfaces.
  • a clamping assembly having an elongated body fitted in the groove including sides defining a longitudinally extending cavity having a narrow access slot at the center, the sides of the body being undercut adjacent the slot to provide a pair of longitudinally extending surfaces for seating the edges of a blanket, a plurality of longitudinally extending U-shaped springs secured to the bottom of the cavity and having blanket-gripping surfaces along the free edges thereof in opposed relation to the respective seating surfaces, and control means for spreading the sides of the springs apart for normally urging them into blanketclamping engagement with the seating surfaces, said spring sides being inwardly sprung and said control means being selectively movable out of obstructive position to permit each spring side to withdraw past the slot to serve as a guide for the edge of the blanket fed into the slot.
  • a clamping assembly having an elongated body fitted in the groove including sides defining a longitudinally extending cavity having an arrow access slot at the center thereof, the sides of the body being undercut adjacent the slot to provide a pair of longtudinally extending blanket-seating surfaces, a U-shaped spring secured at its center to the bottom of the body and having blanket-gripping surfaces at the free edges thereof opposite the respective seating surfaces, a cam shaft substantially occupying the space within said spring and relieved along one side to define camming surfaces extending in opposite directions for pressing outwardly against the sides of the spring for urging the blanket-gripping surfaces against the respective seating surfaces, the sides of the spring being inwardly sprung for selective release of the gripping surfaces upon rocking of the camshaft through a small angle in one direction or the other.
  • a clamping assembly having an elongated body fitted in the groove including sides defining a longitudinally extending cavity having a narrow access slot at the center, said sides being undercut adjacent the slot to provide a pair of longitudinally extending surfaces for seating the ends of the blanket, a pair of longitudinally extensive springs secured to the bottom of the cavity and having blanket-gripping surfaces along the free edges thereof opposite the respective seating surfaces, said springs being outwardly bowed to form a central space, a rockable cam shaft in said space, said cam shaft being relieved along one side to define oppositely directed camming surfaces so that when the cam shaft is in a central reference position the springs are bowed outwardly into blanket-clamping engagement with the seating surfaces and so that when the cam shaft 7 8 is rocked to respective first and second positions on oppo- 2,378,478 6/ 1945 Harless 101415.1 XR site sides of the reference position, the springs are selec- 3,008,410 11/1961 Bryer 101415.1

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Medicinal Preparation (AREA)
US536122A 1966-03-21 1966-03-21 Clamping arrangement for blanket in printing press Expired - Lifetime US3425348A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US53612266A 1966-03-21 1966-03-21

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US3425348A true US3425348A (en) 1969-02-04

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US536122A Expired - Lifetime US3425348A (en) 1966-03-21 1966-03-21 Clamping arrangement for blanket in printing press

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US (1) US3425348A (enrdf_load_stackoverflow)
CH (1) CH452552A (enrdf_load_stackoverflow)
DE (2) DE1962942U (enrdf_load_stackoverflow)
DK (1) DK121906B (enrdf_load_stackoverflow)
GB (1) GB1148014A (enrdf_load_stackoverflow)
SE (1) SE333745B (enrdf_load_stackoverflow)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US3782281A (en) * 1971-02-02 1974-01-01 Mirrow Co Self-tensioning flexible printing plate
US4191106A (en) * 1975-12-01 1980-03-04 K and Manufacturing Company, Inc. Printing plate clamping assembly
US4214530A (en) * 1978-02-23 1980-07-29 Glanzner Gary C Metal printing plate
US4376414A (en) * 1980-05-13 1983-03-15 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Printing plate attachment arrangement
US4391193A (en) * 1980-04-17 1983-07-05 Ryobi Ltd. Plate holding device for offset duplicator
US5396843A (en) * 1992-12-24 1995-03-14 Koenig & Bauer Aktiengesellschaft Method and apparatus for mounting flexible printing plates on a forme cylinder
DE102004062598A1 (de) * 2004-12-24 2006-07-06 Man Roland Druckmaschinen Ag Vorrichtung für einen Druckzylinder, insbesondere Offsetdruckzylinder für Rollen-Rotationsdruckmaschinen

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1761623B1 (de) * 1968-06-18 1972-02-03 Polygraph Leipzig Vorrichtung zum befestigen biegsamer druckplatten auf formzylindern von rotationsdruckmaschinen
DE4034494C1 (enrdf_load_stackoverflow) * 1990-10-30 1992-03-05 Heidelberger Druckmaschinen Ag, 6900 Heidelberg, De
DE4320464C2 (de) * 1993-06-21 1997-03-20 Roland Man Druckmasch Übertragungszylinder für Rotationsdruckmaschinen
DE4335140C1 (de) * 1993-10-15 1995-02-02 Roland Man Druckmasch Vorrichtung zum Befestigen einer biegsamen Druckplatte
DE19924787B4 (de) * 1999-05-29 2004-11-04 Koenig & Bauer Ag Vorrichtung zum Befestigen biegsamer Platten

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US938547A (en) * 1907-11-25 1909-11-02 Alexander Bevan Grinding and polishing roll.
US2378478A (en) * 1943-02-18 1945-06-19 Goss Printing Press Co Ltd Printing press gripper mechanism
GB838885A (en) * 1957-11-07 1960-06-22 Ernest Arthur Timson Improvements relating to printing machine cylinders
US3008410A (en) * 1958-09-23 1961-11-14 Hoe & Co R Plate clamp
US3095811A (en) * 1960-03-07 1963-07-02 Miehle Goss Dexter Inc Tension lockup for thin printing plates
US3335663A (en) * 1964-08-12 1967-08-15 Miehle Goss Dexter Inc Plate lockup for reversible plate cylinder

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE282572C (enrdf_load_stackoverflow) *
US3217644A (en) * 1962-03-30 1965-11-16 Mosstype Corp Clamping means for mounting carrier sheets on flat or round surfaces

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US938547A (en) * 1907-11-25 1909-11-02 Alexander Bevan Grinding and polishing roll.
US2378478A (en) * 1943-02-18 1945-06-19 Goss Printing Press Co Ltd Printing press gripper mechanism
GB838885A (en) * 1957-11-07 1960-06-22 Ernest Arthur Timson Improvements relating to printing machine cylinders
US3008410A (en) * 1958-09-23 1961-11-14 Hoe & Co R Plate clamp
US3095811A (en) * 1960-03-07 1963-07-02 Miehle Goss Dexter Inc Tension lockup for thin printing plates
US3335663A (en) * 1964-08-12 1967-08-15 Miehle Goss Dexter Inc Plate lockup for reversible plate cylinder

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US3782281A (en) * 1971-02-02 1974-01-01 Mirrow Co Self-tensioning flexible printing plate
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
US4214530A (en) * 1978-02-23 1980-07-29 Glanzner Gary C Metal printing plate
US4391193A (en) * 1980-04-17 1983-07-05 Ryobi Ltd. Plate holding device for offset duplicator
US4376414A (en) * 1980-05-13 1983-03-15 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Printing plate attachment arrangement
US5396843A (en) * 1992-12-24 1995-03-14 Koenig & Bauer Aktiengesellschaft Method and apparatus for mounting flexible printing plates on a forme cylinder
DE102004062598A1 (de) * 2004-12-24 2006-07-06 Man Roland Druckmaschinen Ag Vorrichtung für einen Druckzylinder, insbesondere Offsetdruckzylinder für Rollen-Rotationsdruckmaschinen

Also Published As

Publication number Publication date
DK121906B (da) 1971-12-20
DE1561018B1 (de) 1970-12-23
SE333745B (enrdf_load_stackoverflow) 1971-03-29
CH452552A (de) 1968-03-15
GB1148014A (en) 1969-04-10
DE1962942U (de) 1967-06-29

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