DE805875C - Device for clamping plastic printing foils in offset machines - Google Patents

Device for clamping plastic printing foils in offset machines

Info

Publication number
DE805875C
DE805875C DEP55312A DEP0055312A DE805875C DE 805875 C DE805875 C DE 805875C DE P55312 A DEP55312 A DE P55312A DE P0055312 A DEP0055312 A DE P0055312A DE 805875 C DE805875 C DE 805875C
Authority
DE
Germany
Prior art keywords
clamping
plastic printing
offset machines
printing foils
rail
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
Application number
DEP55312A
Other languages
German (de)
Inventor
Rudolf Mueller
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DEP55312A priority Critical patent/DE805875C/en
Application granted granted Critical
Publication of DE805875C publication Critical patent/DE805875C/en
Expired legal-status Critical Current

Links

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
    • B41F27/1243—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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)

Description

Die Druckplatte kann bei Offsetmaschinen bekanntlich statt aus Metall auch aus Kunststoff bestehen. Diese Kunststoffolien besitzen jedoch eine große Wasseraufnahmefähigkeit, wodurch die Folien bei gleicher Spannung im Material sich dehnen. Diese Dehnung bewirkt jeweils ein Verlagern des Bildes, so daß die bisher üblichen Spannvorrichtungen wie gefederte Greiferleisten usw. schlechte Abdrucke bewirken.As is well known, the printing plate in offset machines can be made of metal also made of plastic. However, these plastic films have a high water absorption capacity, whereby the foils stretch with the same tension in the material. This stretch each causes a shift in the image, so that the previously common clamping devices like spring-loaded gripper bars etc. cause bad prints.

Dieser Nachteil wird durch die Erfindung vermieden. Gemäß der Zeichnung ist an dem die Druckfolie aufnehmenden Plattentisch a der Offsetmaschine einerseits eine feste Spannschiene b vorgesehen, deren Spannfläche mit der Tischfläche in einer Ebene liegt. Auf der anderen Seite des Plattentisches ist eine scharnierartig bewegliche Spannschiene c angebracht, die durch Federn d vom Tisch abgedrückt wird. Die Spannfläche e dieser Spannschiene liegt unterhalb der Plattentischfläche.This disadvantage is avoided by the invention. According to the drawing is on the one hand on the plate table a of the offset machine that receives the printing film a fixed clamping rail b is provided, the clamping surface of which with the table surface in one Level lies. On the other side of the platter table is a hinge-like movable one Tensioning rail c attached, which is pressed off the table by springs d. The clamping surface e of this tensioning rail lies below the surface of the table top.

Die das Diuckbild tragende Kunststoffolie wird gemäß der Abbildung in die Spannschienen b und c eingeklemmt und liegt dann durch die Federn d entsprechend gespannt auf dem Plattentisch. Durch die tiefer liegende Spannfläche e wird die Folie um die Tischkante f abgebogen. Die Abbiegung bewirkt an der Tischkante einen großen Reibungswiderstand. Die infolge Feuchtgebung beim Arbeiten der Maschine erfolgende Wasseraufnahme des Folienmaterials bewirkt in diesem Fall keine Dehnung, sondern nur eine Verringerung der Zugspannung im Folienmaterial. Der Reibungswiderstand an der Tischkante wird dabei größer gehalten, als die Spannungsverminderung beträgt, so daß an der Tischkante kein Gleiten erfolgt und das Druckbild sich nicht verändert.The plastic film carrying the image is made according to the illustration clamped in the tensioning rails b and c and then lies by the springs d accordingly excited on the platter. Due to the deeper clamping surface e, the Foil bent around the edge of the table f. The bend causes one at the edge of the table great frictional resistance. The one that occurs as a result of dampening when the machine is working In this case, water absorption of the film material does not cause stretching, but rather only a reduction in the tensile stress in the film material. The frictional resistance the edge of the table is kept larger than the tension reduction is, so that there is no sliding on the edge of the table and the print image does not change.

Zur Veränderung der Spannungsverhältnisse können die Federn d der beweglichen Spannschiene c mittels Schrauben verstellt werden.To change the tension conditions, the springs can d the movable clamping rail c can be adjusted by means of screws.

Claims (2)

PATENTANSPRÜCHE: i. Vorrichtung zum Einspannen von Kunststoffdruckfolien bei Off setmaschinen, dadurch gekennzeichnet, daß der Plattentisch (a) einerseits eine Spannschiene (b) mit in Tischebene liegender Spannfläche und anderseits eine gefederte Spannschiene mit unterhalb der Tischebene liegender Spannfläche trägt, wodurch der infolge Abbiegens der gespannten Folie an der Tischkante (f) entstehende Reibungswiderstand Spannungsdifferenzen innerhalb des Folienmaterials bei begrenzter Feuchtigkeitsaufnahme ohne Wandern der Druckbildfläche zuläßt. PATENT CLAIMS: i. Device for clamping plastic printing foils in offset machines, characterized in that the plate table (a) on the one hand a clamping rail (b) with a clamping surface lying in the plane of the table and one on the other bears spring-loaded tensioning rail with the tensioning surface lying below the table level, as a result of the bending of the stretched film on the edge of the table (f) Frictional resistance voltage differences within the film material at limited Permits moisture absorption without wandering the printed image area. 2. Einspannvorrichtung nach Anspruch i, dadurch gekennzeichnet, daß die Federn (d) der beweglichen Spannleiste (c) mittels Schrauben zur Änderung der Folienspannung einstellbar sind.2. Jig according to claim i, characterized in that the springs (d) of the movable clamping bar (c) can be adjusted by means of screws to change the film tension.
DEP55312A 1949-09-20 1949-09-20 Device for clamping plastic printing foils in offset machines Expired DE805875C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEP55312A DE805875C (en) 1949-09-20 1949-09-20 Device for clamping plastic printing foils in offset machines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP55312A DE805875C (en) 1949-09-20 1949-09-20 Device for clamping plastic printing foils in offset machines

Publications (1)

Publication Number Publication Date
DE805875C true DE805875C (en) 1951-05-31

Family

ID=7387682

Family Applications (1)

Application Number Title Priority Date Filing Date
DEP55312A Expired DE805875C (en) 1949-09-20 1949-09-20 Device for clamping plastic printing foils in offset machines

Country Status (1)

Country Link
DE (1) DE805875C (en)

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