Sheet feed table

Details Sheet feed table Sheet feed table

2000-01-21

2001-09-18

Skaggs, H. Grant (Department: 3651)

Sheet feeding or delivering

Feeding

Separator and conveyor

C271S225000, C271S264000

Reexamination Certificate

active

06290222

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to feed tables for feeding sheets to sheet processing machines, such as printing presses, and more particularly, to a feed table having a table surface that is inclined with respect to the sheet feed plane.
BACKGROUND OF THE INVENTION
It is known to use a pair of roller deflection devices above a feed table in order to deflect sheets to be conveyed, each roller deflection device having individual deflection rollers arranged one behind the other in the conveying direction on a common support. In that arrangement, the individual deflection roller which is at the rear in the conveying direction is driven so as to rotate the individual deflection roller which is at the front in the conveying direction. In addition, the pair of roller deflector devices are installed in a fixed position relative to the feed table. As a result, a change in the quality or type of sheets to be processed requires at least some rebuilding of the installation in order to adapt the pair of roller deflection devices to the different conditions. In addition, the roller deflection devices are complicated, as a result of the drive to the individual deflection rollers, and have a very short deflection range defined by only two deflection points.
It is further known from German Patent DE 29710296 to adjustably position a pair of roller deflection devices by means of a pneumatic cylinder. In this case, the incoming sheet can be more reliably deflected, but can be delayed as a result of a non-positive loading or drive to the rollers. There is a risk therefore, that the sheets cannot be fed correctly to the sheet processing machine.
OBJECTS AND SUMMARY OF THE INVENTION
It is an object of the present invention to provide a sheet feed table which, without the application of driving forces to the rollers, is operable for reliably processing a wide range of sheets, including very stiff sheets, to an inclined sheet feed table for reliable onward transport.
According to the invention, this object is achieved by providing a plurality of roller deflection devices which are adjustably mounted above the feed table and which have a plurality of deflection rollers arranged in the direction run out in the form of a curve approximately tangential to the plane of the feed table. This design enables easy and automatic adjustment of the distance of the roller deflection device above the feed table, as well as its deflection path, for the particular material being processed and for the stiffness of the sheets being processed. It is preferable that the individual deflector rollers be mounted for free rotation, without a positive drive, for preventing abrasion marks on the sheets by the deflection rollers.
A simple design of roller deflection device is achieved by providing relatively slim profiled deflector wheels along the length of the free end of a holder, the height and position of which can be selectively adjusted. Guidance of the sheets over a relatively long distance is achieved and flicking up of the trailing ends of the sheets is substantially avoided if a plurality of such deflection wheels are arranged one behind another in the conveying direction, with each deflection wheel preferably being mounted to rotate freely. The deflection wheels may be arranged at spaced intervals to each other and on opposite sides of the holder, which acts as a common support, with contours of the deflection wheels on one side of the holder overlapping contours of the deflection wheels on the opposite side. With such arrangement, it is possible to ensure reliable contact between each sheet and the deflection wheels so as to redirect the sheets onto the feed table or onto a conveyor tape guided over the feed table. Reliable deflection of the sheets onto the feed table is further enhanced by utilization of a plurality of such roller deflection devices arranged in side-by-side relation to one another at intervals transversely with respect to the conveying direction.


REFERENCES:
patent: 843709 (1907-02-01), Slack et al.
patent: 3932982 (1976-01-01), Klapp
patent: 5295675 (1994-03-01), Hain
patent: 5362037 (1994-11-01), Werff et al.
patent: 196460 (1907-04-01), None
patent: 297 10 296 U1 (1998-11-01), None

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