Claims
- 1. In sheet delivery apparatus for printing machines having a chain delivery device for delivering printed sheets to a delivery pile, pneumatic braking means comprising a plurality of discrete braking roller devices each having means for admitting suction air thereto and respectively having a sheet supporting surface of given width for supporting a printed sheet at non-printed areas thereof, a support shaft extending between side walls of the printing machine adjacent and upstream of the delivery pile in travel direction of the chain delivery device, said support shaft being disposed transversely to said travel direction below the chain delivery device, said plurality of discrete braking roller devices being mounted on said support shaft with the respective sheet supporting surfaces thereof engageable with respective non-printed areas of the sheet for braking and tightening the sheet, the respective sheet supporting surfaces being on respective parts of said braking roller devices which are continuously movable together with the sheet supported thereby in said travel direction of the chain delivery device, said plurality of braking roller devices being each individually exchangeable in the entirety thereof for other respective discrete braking roller devices having sheet supporting surfaces differing in width from said given width thereof so as to match varying widths on non-printed areas on respective printed sheets, the sheet supporting surface of differing width being on respective parts of said other discrete braking roller devices which are continuously movabhle together with the sheet supported thereby, said braking roller devices being of unipartite construction and comprising respective braking rollers formed in a sheet supporting surface thereof with suction chambers recessed therein and having a suction-air feed integral therewith, and drive means for rotating said braking rollers, said drive means comprising separate drive wheels for the respective braking rollers, said drive wheels being mounted on a drive shaft, fixed against rotation relative thereto and axially slidable thereon.
- 2. Sheet delivery apparatus according to claim 1 including support means mountable on said support shaft and secured thereto by clamping screws, and respective suction-air chamber sleeves by which said suction air feed is fixed while said braking rollers are rotatable on said support means.
- 3. Sheet delivery apparatus according to claim 1 wherein said drive means further comprise a pair of revolving drive belts, respectively, disposed on opposite sides of said suction chambers and connected to said drive wheels and said braking rollers.
- 4. In sheet delivery apparatus for printing machines having a chain delivery device for delivering printed sheets to a delivery pile, pneumatic braking means comprising a plurality of discrete braking roller devices each having means for admitting suction air thereto and respectively having a sheet supporting surface of given width for supporting a printed sheet at non-printed areas thereof, a support shaft extending between side walls of the printing machine adjacent and upstream of the delivery pile in travel direction of the chain delivery device, said support shaft being disposed transversely to said travel direction below the chain delivery device, said plurality of discrete braking roller devices being mounted on said support shaft with the respective sheet supporting surfaces thereof engageable with respective non-printed areas of the sheet for braking and tightening the sheet, the respective sheet supporting surfaces being on respective parts of said braking roller devices which are continuously movable together with the sheet supported thereby in said travel direction of the chain delivery device, said plurality of braking roller devices being each individually exchangeable in the entirety thereof for respective discrete braking roller devices having sheet supporting surfaces differeing in width from said given width thereof so as to match varying widths of non-printed areas on respective printed sheets, said braking roller devices being of bipartite construction and comprising a first part formed as a roller member, and a second part carried by said roller member and formed as a separate suction member having a suction-air feed integral therewith and a bearing a clamp, a cross shaft extending parallel to said support shaft between the side walls of the machine, said second part being slippable from above onto the cross shaft and removable upwardly therefrom by means of said bearing clamp, at least one of said braking rollers being formed with a narrow sheet-supporting surface, the respective suction member comprising two suction air chambers between which a single braking roller is disposed having a continuous middle cross piece, said braking means further comprising a braking belt wound around said middle cross piece of said braking roller, said braking roller having hub attachments on both sides of said middle cross piece as supports for said suction air chambers.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2811963 |
Mar 1978 |
DEX |
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Parent Case Info
This is a continuation of application Ser. No. 021,954, filed Mar. 19, 1979, now abandoned.
US Referenced Citations (7)
Continuations (1)
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Number |
Date |
Country |
Parent |
21954 |
Mar 1979 |
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