US3540376A - Device for mounting a negative plate on a printing cylinder - Google Patents

Device for mounting a negative plate on a printing cylinder Download PDF

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Publication number
US3540376A
US3540376A US797881A US3540376DA US3540376A US 3540376 A US3540376 A US 3540376A US 797881 A US797881 A US 797881A US 3540376D A US3540376D A US 3540376DA US 3540376 A US3540376 A US 3540376A
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US
United States
Prior art keywords
sector
cylinder
tensioning
negative plate
printing cylinder
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
US797881A
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English (en)
Inventor
Louis G Corse
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.)
D'etudes De Machines Speciales Sa soc
Mach Speciales SA Soc D Et
Original Assignee
Mach Speciales SA Soc D Et
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 Mach Speciales SA Soc D Et filed Critical Mach Speciales SA Soc D Et
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Publication of US3540376A publication Critical patent/US3540376A/en
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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
    • B41F27/12—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
    • B41F27/1231—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 tangential 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
    • B41F27/10—Devices for attaching printing elements or formes to supports for attaching non-deformable curved printing formes to forme cylinders

Definitions

  • the present invention relates to devices for mounting a negative plate or sheet on a printing cylinder.
  • a known device consists of a locking key or bar engageable in a longitudinal slot formed in the wall of the printing cylinder and retaining in this slot the bent or flanged marginal portions of the plate.
  • Another tensioning and fastening device utilizes jaws to which the edges of the negative plate are secured, these jaws being subsequently moved towards each other for tensioning the negative plate.
  • the device according to the present invention for mounting a negative plate or sheet on a printing cylinder
  • the outer peripheral wall is discontinued in order to provide a longitudinal aperture extending throughout the length of the cylinder, comprises a cylindrical tensioning sector fitting in said aperture and forming with its peripheral surface the partial continuation of the cylinder peripheral surface, the negative plate or sheet having one end bent and anchored to one edge of said sector and its opposite end also bent and anchored to the registering edge of the cylinder aperture, a support for said tensioning sector which is rotatably mounted about the cylinder axis, and means for adjusting the angular position of said support of said tensioning sector in relation to said cylinder for controlling the tension of said negative plate on the cylinder, and is characterized in that it comprises in said longitudinal aperture of the cylinder at least one cylindrical bearing sector adjacent to said tensioning cylindrical sector, the outer surface of said cylindrical bearing sector completing the outer peripheral surface of said cylinder and tensioning sector, and being mounted for transverse adjustment on the pair of lateral flanges of said cylinder.
  • the mounting device is advantageous in that the width of the longitudinal gaps existing between the cylindrical bearing sector or sectors, the tensioning sector and the longitudinal edges of the continuous cylinder wall can be reduced to a very small value while permitting, due to the transverse shifting of the cylindrical bearing sector or sectors, of introducing the bent or folded edges of the negative plate into the gap left to this end between the cylindrical tensioning sector and the adjacent longitudinal edge of the cylinder wall.
  • the empty gap or interval necessarily provided for introducing the bent edges of the negative plate or sheet into the cylinder for tensioning this negative plate or sheet is divided into a.plurality of elementary narrower gaps.
  • Another advantageous feature characterizing this arrangement is obtained when the negative plate or sheet is intended for making several successive prints during each single revolution of the printing cylinder, for example for printing labels, illustrations, vignettes, etc., separated by nonprinted areas.
  • the very reduced width of the empty or blank gaps left on the periphery of the printing cylinder may be inferior to the distance between two adjacent or successive prints, so that no circumferential space is lost during the printing process.
  • FIG. I is a cross-sectional view showing a printing cylinder provided with a mounting and tensioning device for negative plate or sheet according to this invention, this section being taken along the line H of FIG. 2;
  • FIG. 2 is a fragmentary plan view from above of the printing cylinder of FIG. 1;
  • FIG. 3 is a fragmentary axial section taken along the line III-III of FIG. 1;
  • FIG. 4 is a cross section taken along the line lV-IV of FIG.
  • FIG. 5 is a longitudinal section taken along the line V-V of FIG. 4.
  • the printing cylinder illustrated in the drawings comprises a peripheral wall 1 secured at either end to transverse flanges 2 by means of screws 3.
  • Each flange 2 has an inner extension in the form of a cylindrical hub 4 and is rotatably solid with a shaft 5.
  • the cross-sectional contour of the peripheral wall I of this printing cylinder is not completely circular and has an angular amplitude of about 290.
  • the longitudinal edges Ia and lb of this peripheral wall 1 will thus define therebetween an aperture extending longitudinally throughout the cylinder length between said flanges 2, and the transverse are covered by this aperture constitutes a gap of about 70.
  • this numerical value should not be construed as limiting the invention, as will be seen presently.
  • a cylindrical tensioning sector 8 and a cylindrical bearing sector 9 are adapted to be mounted in the aperture defined by the longitudinal edges la and 1b.
  • the cross-sectional amplitude of these cylindrical sectors 8 and 9 is about 32 for each sector, but again this value should not be regarded as limiting the scope of the invention.
  • the cylindrical tensioning sector 8 is rigid, at either end, with a radial arm ll formed with an integral sleeve 12 rotatably mounted on the hub 4 of flange 2.
  • the cylindrical tensioning sector 8 comprises at either end a radially thinner annular portion I3 of same angular amplitude which fits on the peripheral surface 20 of flange 2.
  • This portion I3 comprises a slot 14 extending transversely to and registering with a tapped hole 15 formed in the peripheral outer surface 2a of flange 2.
  • a set screw 16 extending through said slot I4 is screwed in said tapped hole 15 for locking the cylindrical tensioning sector 8 in the desired adjustment position on said flange 2.
  • the negative plate or sheet 17, illustrated in its operative and tensioned condition on the printing cylinder, has anchoring ends or edges l7a,I7b bent twice at right angles. As clearly shown in FIGS. 1 and 4, the edges 17a and 17b engage the longitudinal gap 18 (having a width a when the plate 17 is secured and tensioned) formed between the longitudinal edge 8a of the tensioning sector and the longitudinal edge la of the peripheral wall 1. The ends or edges 17a and 17b are bent twice at right angles in order to provide an inner lip adapted to anchor the negative plate I7 to the registering edges of sector 8 and wall 1.
  • the negative plate or sheet I7 disposed or wound on the printing cylinder is tensioned by means of a screw [9 provided at each cylinder end and engaged in a support 21 rigid with the adjacent flange 2, a locknut being associated with this screw for maintaining the plate 17 in the desired tensioned condition.
  • Notches 23 and 24 are formed in the bearing sector 9 and in the longitudinal edge lb of the peripheral wall I of the printing cylinder, respectively, so as to register with the head of screw 19 and locknut 22 and permit the tightening or loosening of these members from outside the cylinder.
  • the cylindrical hearing sector 9 comprises two longitudinal edges 9a and 9b forming, in conjunction with the longitudinal edge 8b of tensioning sector 8 and the longitudinal edge lb of wall I, longitudinal gaps 25 and 26 having widths denoted b and c respectively (assuming the negative plate 17 is secured and tensioned).
  • the cylindrical bearing sector 9 comprises at either end an extension 27 radially thinner than, but of same angular amplitude as, the remaining portion of the sector.
  • This extension 27 has formed therethrough an elongated hole 28 having its major dimension disposed circumferentially and registering with a tapped hole 29 formed in the peripheral surface 2a of flange 2.
  • This tapped hole 29 is engaged by a set screw for locking the cylindrical bearing sector 9 in relation to said flange 2.
  • the hearing sector 9 is slightly shifted in turn in order to create a gap 26 having a w idth.c (corresponding to an arc of about 2).
  • the tensioning of the negative plate 17 is completed by further moving the tensioning sector 8 away from the bearing sector 9 (with an angular shift of about 2) so as to create therebetween a gap 25 having a width b (corresponding to an arc of about 2).
  • the setscrew 19 is locked by means of its locknut nut 22.
  • the gap 18 has a width a reduced to an arc of about 2.
  • bearing sector 9 is also locked on flange 2 by means of screws 31 and the printing cylinder is ready for use.
  • the widths ofgaps 18, 25 and 26 are extremely small, of the order of 2 to 3 mm (.0") in practice, in the case of a printing cylinder having an outer diameter of mm (7"); under these conditions the tensioning sector 8 and bearing sector 9 can be utilized efficiently for printing labels, vignettes, illustrations, etc., separated by nonprinted areas or strips coincident with the above-defined gaps 25 and 26.
  • a device for mounting a negative plate on the printing cylinder of a rotary printing machine which comprises a shaft, a pair of lateral flanges rigid with said shaft and an outer peripheral wall discontinued in order to provide a longitudinal aperture extending throughout the cylinder length, said device comprising a cylindrical plate-tensioning sector fitting in said cylinder aperture, and forming with its outer peripheral surface the partial continuation of the cylinder said tensioning sector having anchored to one of its longitudinal edges one bent longitudinal end of said negative plate of which the other bent end is anchored to the registering edge of the peripheral surface of said cylinder which bounds said cylinder aperture, a tensioning sector support rotatably mounted on said cylinder shaft, means for adjusting the angular position of said tensioning sector support in relation to said cylinder, to permit the control of the tension of said negative plate, and at least one cylindrical hearing sector adjacent to said tensioning sector, also fitting in said longitudinal cylinder aperture and forming with its outer periphery the continuation of the outer surface of said tensioning sector and of said cylinder, said cylindrical bearing sector being mounted for
  • tensioning and bearing sector comprises at each longitudinal end radially thinner portions adapted to slip on the peripheral surface of the lateral flanges of said cylinder, elongated holes formed in said thinner portions and set screws extending through said elongated holes and engaging registering tapped holes formed in the peripheral surface of said lateral flanges.

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  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
US797881A 1968-02-14 1969-02-10 Device for mounting a negative plate on a printing cylinder Expired - Lifetime US3540376A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR139824 1968-02-14

Publications (1)

Publication Number Publication Date
US3540376A true US3540376A (en) 1970-11-17

Family

ID=8645967

Family Applications (1)

Application Number Title Priority Date Filing Date
US797881A Expired - Lifetime US3540376A (en) 1968-02-14 1969-02-10 Device for mounting a negative plate on a printing cylinder

Country Status (8)

Country Link
US (1) US3540376A (id)
BE (1) BE727838A (id)
DE (1) DE1905448C3 (id)
FR (1) FR1568127A (id)
GB (1) GB1223654A (id)
LU (1) LU57874A1 (id)
NL (1) NL6902368A (id)
SE (1) SE347467B (id)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4018158A (en) * 1975-12-29 1977-04-19 A. B. Dick Company Universal master cylinder for offset presses
US4552068A (en) * 1983-01-11 1985-11-12 Albert-Frankenthal Ag Gravure cylinder
US5107763A (en) * 1990-04-24 1992-04-28 Rockwell International Corporation Narrow gap plate mounting apparatus and method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3722174A1 (de) * 1987-07-04 1989-01-12 Roland Man Druckmasch Vorrichtung zum aufspannen einer biegsamen druckplatte auf dem formzylinder einer bogen-rotationstiefdruckmaschine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4018158A (en) * 1975-12-29 1977-04-19 A. B. Dick Company Universal master cylinder for offset presses
US4552068A (en) * 1983-01-11 1985-11-12 Albert-Frankenthal Ag Gravure cylinder
US5107763A (en) * 1990-04-24 1992-04-28 Rockwell International Corporation Narrow gap plate mounting apparatus and method

Also Published As

Publication number Publication date
DE1905448B2 (de) 1979-04-05
SE347467B (id) 1972-08-07
BE727838A (id) 1969-07-16
DE1905448A1 (de) 1969-09-11
NL6902368A (id) 1969-08-18
LU57874A1 (id) 1969-05-21
DE1905448C3 (de) 1979-12-06
GB1223654A (en) 1971-03-03
FR1568127A (id) 1969-05-23

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