US 4,413,562 AGranted

Chain-type transport apparatus, for use with printing machines

AssigneeMAN Roland Druckmaschinen AG

InventorHermann Fischer

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Abstract

To prevent uncontrolled movement or flutter of a trailing end of a sheet being removed by a chain conveyor from a delivery drum (7) of a printing system (1), the sheets are gripped by grippers (10) connected to cross struts (9) of two chains (8), and engaged by sheet engaging brushes (19, 22) or rollers or ducts (30, 34) with differential pressure application, such as compressed air, to urge the sheets against a sheet guide vane (13) or strip. To prevent interference with the grippers (10) on the chain conveyor, the sheet guide elements are lifted off from the sheets upon passage of the grippers by a cam-cam follower arrangement. The cams may be secured to the gripper structures in the form of cam curves (11), engaged by cam followers (17, 22) which pivot or tilt cross rods (15, 20) to lift the brushes off the sheets; or a cam (25; FIG. 2) can be placed on the delivery drum, controlling cam followers (27, 31) which, over a linkage, lift off the engagement elements (30, 34) when the grippers come therebeneath, but permit engagement thereof when the grippers have passed, to control movement of the trailing portions of the sheet.

Claims10

Dependent claims

Sheet transport apparatus for a sheet-fed rotary printing machine having a drum, or cylinder (7) from which a sheet (12) is to be transported, and defining a sheet delivery zone (A) adjacent thereto;

two endless transport chains (8) located at axial ends of the drum or cylinder;
cross struts (9) connecting the chains, located at spaced intervals thereon;
sheet grippers (10) located on the cross strut to grip the leading edge of the sheet (12) to be transported;
and comprising in accordance with the invention
means to prevent creasing, rolling-over or other uncontrolled movement of the trailing end of the sheet being transported comprising
movable sheet guide elements (19, 22, 30, 34) located at least in said sheet delivery zone (A) and extending at least in part transversely to the movement of the sheet as it is being transported;
and movement control means (11, 16, 17;
25, 26, 27, 28) connected to and controlling movement of said movable sheet guide elements, in synchronism with rotation of the drum, or cylinder (7) between an inoperative position when the grippers (10) on the chain pass beneath said sheet guide elements and an operative position thereafter in which said sheet guide elements move to operative engagement with the portion of the sheet behind the leading end thereof gripped by said grippers, to control the position of said portion of the sheet on the chain conveyor.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/360,066Filed 22 Mar 1982
Priority: DE 311458110 Apr 1981
Granted: 8 Nov 1983
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

B65H 29/041
The grippers being carried by endless chains or bands: and introducing into a pile
B65H 29/042
The grippers being carried by endless chains or bands: intermediate conveyors, e.g. transferring devices
B65H 29/52
Delivering or advancing articles from machines; Advancing articles to or into piles: stationary guides or smoothers
B65H 2801/21
Image reproduction devices: industrial-size printers, e.g. rotary printing press