US3702098A - Mounting for thin printing plates - Google Patents

Mounting for thin printing plates Download PDF

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Publication number
US3702098A
US3702098A US121358A US3702098DA US3702098A US 3702098 A US3702098 A US 3702098A US 121358 A US121358 A US 121358A US 3702098D A US3702098D A US 3702098DA US 3702098 A US3702098 A US 3702098A
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US
United States
Prior art keywords
plate
saddle
printing
bar
mounting
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
US121358A
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English (en)
Inventor
William H Eburn Jr
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.)
WR Grace and Co
Original Assignee
WR Grace and Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by WR Grace and Co filed Critical WR Grace and Co
Application granted granted Critical
Publication of US3702098A publication Critical patent/US3702098A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B41F27/14—Devices for attaching printing elements or formes to supports for attaching printing formes to intermediate supports, e.g. adapter members
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18992—Reciprocating to reciprocating

Definitions

  • This invention relates to a backing plate plate or saddle for detachably mounting flexible thin printing plates. More particularly, the present invention is .directed to a saddle provided with a studded plate securing bar which is spring biased by a slidable bar positioning element. Co-action of the positioning element and the securing bar both disposed within the thickners of the saddle provides the means for securing a flexible thin printing plate under tension against a surface of the saddle.
  • a known form of construction comprises a plurality of arcuately formed printing plates attached to a solid cylinder by means of a system of internal claws or clamping bolts.
  • the printing cylinder commonly receives two plates, each occupying half the cylinder. lt is important to be able to change the plates quickly, because with modern high speed operation a large quantity of printing is run off in a short time, following which the plates must be changed, and if plate change cannot be done quickly the down time of the printing press will be excessive.
  • a preferable and more convenient suggested method of forming a printing surface comprises mounting a relatively thin plate, having a thickness of approximately .030 inch, for example, onto the surface of a cylinder.
  • a relatively thin plate having a thickness of approximately .030 inch, for example, onto the surface of a cylinder.
  • Such a plate may be readily produced as a plastic plate or by electro-deposition on a metal plate. It is, however, difficult and costly to make such plates thick enough to accommodate conventional internal clamping means. Considerable difficulties are thus presented in a satisfactory method of securing and tensioning a thin plate on to a cylinder without including undesirable zones of ineffective printing surface.
  • a backing plate or saddle of sufficient thickness must be used in combination with the thin flexible printing plate such that the combined thickness essentially corresponds to the thickness of a standard stereotype plate.
  • the backing or saddle should be of sufficient rigidity to withstand the pressures generated by high speed print-
  • One method of attaching a thin flexible printing plate to a saddle or backing plate is by adhesion of the printing plate thereto. This method, however, has a drawback in that the rigidity of the adhesive bond prevents subsequent registering and adjustment. Additionally, after use, removal of the printing plate from the saddle may cause damage to the saddle and/or the printing plate thereby curtailing their useful lives.
  • Another drawback to adhesive mounting of printing plates is the extended time necessary to remove the adhesive from the saddle after removal of the plate.
  • Another method of securing printing plates to saddles or backing plates is by use of either magnetic force or a vacuum means.
  • Such systems are complicated, of intricate design plate support, and typically preclude the use of stereotype printing plates on conventional printing press.
  • the present invention provides a backing plate or saddle for detachably mounting flexi- 'ble thin printing plate by means of a studded plate securing bar which is spring biased by a slidable bar positioning element.
  • the studded plate securing bar engages slots near the edge of the printing plate for mounting the plate under tension against an upper surface of the saddle.
  • the flexible thin printing plates of this invention are generally characterized as having a section for mounting which maintains contact with the studded members.
  • the body or backing of the printing plate may be formed of most any flexible thin printing plate material provided that at least the ends of the plate to be mounted are characterized with the ability to retain contact without rupture.
  • the flexible thin printing plates may be composed of thin metal sheet of aluminum, steel, copper, brass, a magnesium alloy, or the like; a polymeric or plastic material such as a synthetic organic resin or polymer; hard or semi-rigid rubber; or the like.
  • the saddle or backing plate should be of sufficient thickness such that it is suff ciently stiff and does not flex to any appreciable degree when receiving a printing plate or when mounted on a printing press.
  • the thickness of the saddle is chosen to complement the overall thickness of the printing plate such that the printing face is at a desired diametral height above the outer cylindrical surface of the printing cylinder.
  • the saddle may be made of metals and alloys described above for the printing plate or hard, semi-rigid plastics such as phenol formaldehyde, acrylic, phenolic, nylon, and the like as well as other light weight materials.
  • the present invention is highly advantageous because it permits mounting of flexible printing plates onto printing presses using completely conventional printing cylinders, techniques, and catches.
  • the base saddle or backing plate is reuseable and the printing plate may be used for a production run, removed from the saddle, stored for any length of time and then remounted to the same or a different saddle to be run again at a later date.
  • This invention thus permits a printer to maintain a minimum inventory of saddles and insures his ability to reuse any stable printing plate in the future.
  • the present invention provides a mounting means which is simple and rapidly manipulated without requiring complex printing plate positioning and tensioning elements.
  • the present invention provides a mounting means which is simple and rapidly manipulated without requiring complex printing plate positioning and tensioning elements.
  • FIG. 1 is a broken partial perspective view of the present mounting means on a saddle illustrated receiving a printing plate;
  • FIG. 2 is a broken partial perspective view ofthe present mounting means with printing plate in engaged position
  • FIG. 3 is a front elevational view of the'studded plate securing bar of the present mounting means
  • FIG. 4 is a top view of the securing bar of FIG. 3;
  • FIG. 5 is a front elevational view of the slidable bar positioning element of the present mounting means; and FIG. 6 is a top view of the element illustrated in FIG. 5.
  • FIGS. 1-2 illustrate a portion of saddle 10 having a section removed along the edge of the thickness thereof and forming'side walls 11 and 13 for receiving studded plate securing bar 12.
  • Securing bar 12 is provided with integral studded members 14 formed as a rectangular cross-section and illustrated with a slightly tapered upper section for receiving a flexible thin printing plate backing 16 by way of slots 18. Other configurations for members 14 may be as desired.
  • Slots 18 are disposed near the edge'of the printing plate. and desirably within a creased terminal portion thereof.
  • the printing plate backing or support sheet 16 includes a printing surface 20 formed of suitable materials as desired. Within the creased terminal.
  • L-shaped bar 22 is disposed integrally to slidablebar positioning element 26 having an area described subsequently for receiving pin 28 along cantilever 30 for movement of securing bar 12 in the direction of arrow 25.
  • a further portion of the positioning element 26 permits limited movement in the I direction of arrow 24 by fixed pin 32 within'walls leveler l3.
  • FIG. 2 further illustrates the printing plate when secured in position under tension by securing bar 12' with pin 28 appearing near the edge of cantilever 30 which spring biases securing bar 12 and thereby proformed from a thin plate with body members 36 constructed slightly greater in size than internal members 28.
  • Pin engaging surfaces.34 are formed integral with thersecuring bar and receive pins 28 which engage with the cantilever member 38 as illustrated in FIGS. 1-2.-
  • FIGS. 5-6 illustrate in greater detail slidable bar positioning element 26.
  • Thisybarypositioning element is formed of a metal plate having a body portion 40 and cantilever housing 42 disposed in any convenient number-and especially three such as illustrated.
  • Cantilever housing 42 includes a horizontal cantilever por-" tion 44 from which slightly elevated cantilever 13 projects.
  • 'Also disposed within cantilever'housing 42 is a horizontal slot 46 for receiving permanently fixed pin 32 disposed within side walls 11 and 13. Horizontal slot 46 thereby permits bar positioning element 26 to slide in a horizontal direction a length depending upon the cut-out size.
  • Housing 42 also includes an upperitapering-surface 48 from substantially horizontally configurated surface 45. Surface 48 joins with a vertical end surface 50 to form an area for free movement of cantilever 30 therein.
  • bar element 26 is joined by pins 28 along the upper surface of cantilever 30. Next, these two elements are disposed within the cut-out edge of the saddle and pin .32 is secured through the cut-out within slot 46. Thus, element 26 may slide in a horizontal direction by movement of L-shaped bar 22 with movement limited within slot 46.
  • the positioning and configuration of cantilever 30 upon movement of element 26 in the direction of arrow 24 causes pins 28 to move bar 12 in the direction of arrow 25.
  • Element 26 being constructed of metal which permits cantilever 30 to be characterized with a spring biasing effect, also causes bar 12 to be spring biased, thereby providing a tension engaging means for plate 16 when slot 18 receives studded member 14.
  • the co-action of positioning element 26 and securingbar 12 both disposed within the thickness of the saddle provides an efficient and highly acceptable means for securing printing plate 16 in position on saddle 10.
  • printing plate retaining members may be designed to perform the function of that generally illustrated for simplicity in the drawing.
  • various means may be included for mounting the printing plate retaining members to the saddle and it is possible that some of the elements may be formed directly as part of the saddle as desired.
  • the present securing means appear at both ends of the saddle, it is recognized that only one such means need be included with other means used to secure the opposite side of the printing plate asdesired.
  • the formed ends of the printing plate holdin intimate contact with the ends of the saddle and the necessary tension developed will cause the printing plate tolie snugly against the outer arcuate surface of the saddle.
  • the printing plate and the saddle are now an integral assembly and may be locked to a printing press cylinder in a conventional manner.
  • the assembled printing plate and saddle may be fastened onto the printing cylinder bymeans of conventional clamping blocks or hooks known to the art. Suitableslots may be made on the inner arcuate surface andat each end .of the saddle to permit the use of tension lockup catches to assist in holding the saddle and the printing plate on the cylinder or flat bed.
  • the saddle may be also used on printing presses equipped with margin bars in place of one or more of the standard catches. All moving parts may be made of wear resistant materials, thus insuring a long life. Since many printers prefer light materials, which may be more susceptible to damage, the elements of the present means may be made of hard materials and be removed from a worn or damaged saddle and reinstalled in a replacement saddle, thus minimizing costs.
  • the printing plate is supported on a continuous, one piece uninterrupted surface assuring maximum printing quality.
  • auxiliary support or reinforcement members may also be included as part of the apparatus where required.
  • a means for mounting flexible thin plates which comprises in combination, a studded plate securing bar, a slidable bar positioning element, and cantilever spring element means disposed within the body of the slidable bar positioning element, said studded plate securing bar having stud means for engaging slots disposed near the terminal edge of the plate for mounting the plate under tension derived from said cantilever spring element means.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Screen Printers (AREA)
US121358A 1971-03-05 1971-03-05 Mounting for thin printing plates Expired - Lifetime US3702098A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12135871A 1971-03-05 1971-03-05

Publications (1)

Publication Number Publication Date
US3702098A true US3702098A (en) 1972-11-07

Family

ID=22396162

Family Applications (1)

Application Number Title Priority Date Filing Date
US121358A Expired - Lifetime US3702098A (en) 1971-03-05 1971-03-05 Mounting for thin printing plates

Country Status (11)

Country Link
US (1) US3702098A (fr)
AU (1) AU462613B2 (fr)
BE (1) BE780049A (fr)
BR (1) BR7201229D0 (fr)
CA (1) CA962126A (fr)
DE (1) DE2204873C3 (fr)
FR (1) FR2127919A5 (fr)
GB (1) GB1316239A (fr)
IT (1) IT949848B (fr)
NL (1) NL144199B (fr)
SE (1) SE383489B (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3750572A (en) * 1972-06-12 1973-08-07 Rockwell International Corp Printing plate cylinder saddle
US3899972A (en) * 1973-08-27 1975-08-19 William H Albright Registration-adjusting printing plate saddle
US3942555A (en) * 1974-03-25 1976-03-09 Indak Manufacturing Corporation Electrical switch and fluid control device
DE2654255A1 (de) * 1975-12-01 1977-06-16 K & F Manufacturing Co Spannvorrichtung fuer druckplatten
US4044669A (en) * 1974-05-30 1977-08-30 Almedahls Aktiebolag Rotary screen mounting device
USRE30718E (en) * 1978-12-14 1981-08-25 Rockwell International Corporation Saddle lockup for flexible printing plate
US4526100A (en) * 1983-05-20 1985-07-02 Siasprint S.R.L. Gripper device for transporting and registering plates or sheets to be overprinted on silk screen printing machines in one or more colors
US4529103A (en) * 1982-08-21 1985-07-16 Bernd Drzevitzky Dispenser of coating material with adjustable outlet
US4840121A (en) * 1986-11-26 1989-06-20 Am International, Inc. Master holding mechanism for duplicating machines
US5052299A (en) * 1989-03-30 1991-10-01 Akiyama Printing Machine Manufacturing Company Ltd. Plate clamping apparatus for a leaf-type printing machine
US5199352A (en) * 1990-02-24 1993-04-06 Komori Corporation Plate lock-up device for printing press
US5553543A (en) * 1994-12-28 1996-09-10 Riso Kagaku Corporation Print sheet leading end mounting device having means for lifting released leading end
US5562036A (en) * 1994-07-14 1996-10-08 Koenig & Bauer Aktiengesellschaft Device for securing packings in printing cylinders

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US469226A (en) * 1892-02-23 Abrading-cylinder for polishing-machines
US960218A (en) * 1908-12-23 1910-05-31 Miehle Printing Press & Mfg Flexible printing-plate and means for securing the same.
US1662284A (en) * 1927-03-17 1928-03-13 Frank B Shea Blanket holder for printing cylinders
US2916990A (en) * 1957-09-11 1959-12-15 Dick Co Ab Ink pad tensioner for stencil duplicators

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US469226A (en) * 1892-02-23 Abrading-cylinder for polishing-machines
US960218A (en) * 1908-12-23 1910-05-31 Miehle Printing Press & Mfg Flexible printing-plate and means for securing the same.
US1662284A (en) * 1927-03-17 1928-03-13 Frank B Shea Blanket holder for printing cylinders
US2916990A (en) * 1957-09-11 1959-12-15 Dick Co Ab Ink pad tensioner for stencil duplicators

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3750572A (en) * 1972-06-12 1973-08-07 Rockwell International Corp Printing plate cylinder saddle
US3899972A (en) * 1973-08-27 1975-08-19 William H Albright Registration-adjusting printing plate saddle
US3942555A (en) * 1974-03-25 1976-03-09 Indak Manufacturing Corporation Electrical switch and fluid control device
US4044669A (en) * 1974-05-30 1977-08-30 Almedahls Aktiebolag Rotary screen mounting device
DE2654255A1 (de) * 1975-12-01 1977-06-16 K & F Manufacturing Co Spannvorrichtung fuer druckplatten
US4191106A (en) * 1975-12-01 1980-03-04 K and Manufacturing Company, Inc. Printing plate clamping assembly
USRE30718E (en) * 1978-12-14 1981-08-25 Rockwell International Corporation Saddle lockup for flexible printing plate
US4529103A (en) * 1982-08-21 1985-07-16 Bernd Drzevitzky Dispenser of coating material with adjustable outlet
US4526100A (en) * 1983-05-20 1985-07-02 Siasprint S.R.L. Gripper device for transporting and registering plates or sheets to be overprinted on silk screen printing machines in one or more colors
US4840121A (en) * 1986-11-26 1989-06-20 Am International, Inc. Master holding mechanism for duplicating machines
US5052299A (en) * 1989-03-30 1991-10-01 Akiyama Printing Machine Manufacturing Company Ltd. Plate clamping apparatus for a leaf-type printing machine
US5199352A (en) * 1990-02-24 1993-04-06 Komori Corporation Plate lock-up device for printing press
US5562036A (en) * 1994-07-14 1996-10-08 Koenig & Bauer Aktiengesellschaft Device for securing packings in printing cylinders
US5553543A (en) * 1994-12-28 1996-09-10 Riso Kagaku Corporation Print sheet leading end mounting device having means for lifting released leading end

Also Published As

Publication number Publication date
AU3956272A (en) 1973-09-06
NL7202651A (fr) 1972-09-07
BR7201229D0 (pt) 1973-09-25
NL144199B (nl) 1974-12-16
DE2204873C3 (de) 1974-08-08
SE383489B (sv) 1976-03-15
BE780049A (fr) 1972-07-17
DE2204873A1 (de) 1972-09-21
IT949848B (it) 1973-06-11
GB1316239A (en) 1973-05-09
DE2204873B2 (de) 1974-01-17
CA962126A (en) 1975-02-04
FR2127919A5 (fr) 1972-10-13
AU462613B2 (en) 1975-05-10

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