Device for feeding sheets

Patent metadata

Field	Value
Publication number	US-11530102-B2
Application number	US-202017600147-A
Country	US
Kind code	B2
Filing date	Aug 12, 2020
Priority date	Aug 21, 2019
Publication date	Dec 20, 2022
Grant date	Dec 20, 2022

Abstract

A device is provided for feeding sheets to a sheet-processing machine having at least one processing mechanism. A feeder head is provided for cyclically separating the sheets from a pile of such sheets and has transporting suckers for transporting the sheets to a belt table. The belt table has at least one revolving transport belt which is guided over at least two feed rollers. A first drive is assigned to at least one feed roller and a sheet flap, which is connected to a pivotally mounted shaft, is provided between the transporting suckers and the at least one transport belt. A second drive is assigned to the shaft, for pivoting that shaft. A sheet arrival sensor, which is arranged between the belt table and the processing mechanism, generates first signals representing the arrival of the sheets for a sequence of sheets. A clock generator generates second signals representing the angular position of the at least one processing mechanism, and has a controller, which controls the first drive as a function of the second signals and which controls the second drive as a function of the first and second signals.

First claim

The invention claimed is:

1. A sheet-processing machine comprising;
at least one processing mechanism;
a feeder head for cyclically separating the sheets from a pile, the feeder head comprising transporting suckers for transporting the sheets;
a belt table comprising at least one revolving transport belt, which is guided over at least two feed rollers wherein the transporting suckers are configured to transport the sheets to the belt table;
a first drive assigned to at least one feed roller of the at least two feed rollers;
a sheet flap, which sheet flap is connected to a pivotably mounted shaft, the sheet flap being provided between the transporting suckers and the at least one transport belt;
a second drive assigned to the pivotably mounted shaft for pivoting the pivotable mounted shaft,
a sheet arrival sensor, which sheet arrival sensor is arranged between the belt table and the at least one processing mechanism and which sheet arrival sensor generates first signals representing the arrival of the sheets for a sequence of sheets;
a clock generator, which clock generator generates second signals representing an angular position of the at least one processing mechanism; and
a controller, which controller controls the first drive as a function of the second signals, and which controls the second drive as a function of the first and second signals, wherein clock-based speed profiles, describing a duration of time for handling one sheet are stored in the controller for controlling the first and second drives.

2. The sheet-processing machine according to claim 1 , wherein the clock-based speed profiles have a discontinuous speed curve.

3. The sheet-processing machine according to claim 2 , wherein the controller is designed to ascertain the phase positions of the first signals in relation to the phase positions of the second signals.

4. The sheet-processing machine according to claim 3 , wherein the controller is designed to control the second drive as a function of the phase positions of the first signals in relation to the phase positions of the second signals.

5. The sheet-processing machine according to claim 1 , one of wherein the controller is designed to control the second drive in such a way that, as a function of phase positions of the first signals in relation to phase positions of the second signals, phase positions of the speed profile of the second drive are shifted in one of a leading and a trailing manner with respect to the phase positions of the speed profile of the first drive, and wherein the second drive is driven using a speed profile that has one of an increased and a decreased average speed.

6. The sheet-processing machine according to claim 1 , wherein a pivotably mounted timing roller shaft carrying timing rollers is provided, and wherein the second drive is designed to drive the timing roller shaft and the shaft connected to the sheet flap.

7. The sheet-processing machine according to claim 1 , wherein a fifth drive is assigned to one of the feeder head and the transporting suckers, and wherein the controller controls the fifth drive as a function of the first and second signals.

8. The sheet-processing machine according to claim 7 , wherein the controller controls the first drive as a function of the second signals.

9. The sheet-processing machine according to claim 1 , wherein the at least one processing mechanism is an offset printing mechanism.

Assignees

• Koenig & Bauer Ag

Inventors

• Sünder Martina
• Hanke Bernd
• Gohl Benjamin
• Dorninger Richard

Classifications

• B65H11/002

  incorporating transport belts · CPC title

• B65H5/021

  by belts · CPC title

• B65H3/0816 Primary

  separating from the top of pile · CPC title

• B65H3/02

  using friction forces between articles and separator · CPC title

• B65H7/20 Primary

  Controlling associated apparatus · CPC title