Sensors and variable positioned lift plates for laminated stocks in paper trays with a top vacuum feeder

1. A sheet feed apparatus for a document reproduction machine, comprising:

a feed device constructed to receive a sheet;

a feedbox having an upper portion and a lower portion, a bottom located in the lower portion, and the feed device located at the upper portion of the feedbox;

a plurality of plungers located at the lower portion;

a vertically adjustable elevator, positioned within the feedbox, and constructed to carry the sheet;

a plurality of sensors situated at an upper portion of the feedbox wherein the sensors are activated by a portion of the sheet;

a data processing device that receives information from the plurality of sensors; and

a single actuating device located below the plurality of plungers, and connected to the plurality of plungers, constructed to receive information from the data processing device,

wherein:

the plurality of sensors comprises at least four sensors located at positions corresponding to at least four different edges of the sheet;

the four sensors are configured to measure a height of the sheet at the corresponding edge of the sheet;

each one of the plurality of plungers contacts a different portion of the sheet;

the plurality of plungers are constructed to independently adjust the height of the sheet where the plurality of plungers contacts the portion of the sheet; and

each plunger of the plurality of plungers adjusts the height of the corresponding portion of the sheet until the four sensors measure the height of the sheet to be the same at each sensor.

2. The sheet feed apparatus of claim 1 , wherein the feedbox comprises an adjustable side.

3. The sheet feed apparatus of claim 1 , wherein the sensors are optical.

4. The sheet feed apparatus of claim 1 , wherein the plungers comprise a head that is parallel to the bottom.

5. The sheet feed apparatus of claim 1 , wherein the feed device defines an opening situated on a plane parallel to the bottom, and the sensors are positioned on a plane parallel to the opening.

6. The sheet feed apparatus of claim 1 , further comprising a plate connected to at least one of the plurality of plungers wherein the plate is arranged on a plane substantially parallel to the bottom, and wherein the plate is constructed and arranged to be actuated by at least one of the plurality of plungers to move a portion of the sheet, thereby causing the sheet to be fed into the feed device in a substantially flat state.

7. The sheet feed apparatus of claim 4 , wherein the plunger head is adjustable.

8. The sheet feed apparatus of claim 1 , wherein the apertures are adjustable.

9. The sheet feed apparatus of claim 1 , wherein the plurality of plungers are variably angled.

10. The sheet feed apparatus of claim 1 , wherein the plungers further comprise a detachable head.

11. The sheet feed apparatus of claim 1 , wherein the plungers further comprise a head that is irregularly shaped.

12. The sheet feed apparatus of claim 1 , wherein the elevator further comprises a plurality of apertures that are capable of receiving the plungers.

13. A method for feeding sheets in a document reproduction device, comprising:

moving vertically an elevator that contains a sheet inside a feedbox;

sensing at least one sheet, by using at least four sensors located at positions in the feedbox that correspond to four different edges of the sheet;

sending information from the sensors to a data processing device;

processing the information in the data processing device;

sending processed information to a single actuating device, the actuating device being connected to a plurality of plungers; and

actuating the actuating device to move the plurality of plungers, the plurality of plungers being configured to move independently to cause at least one sheet to be situated substantially in parallel to the bottom of the feedbox,

whereby feeding the substantially in parallel sheet to the feed device located above the feedbox is accommodated.

14. The method of claim 13 , wherein the data processing device is connected to the actuating device.

15. The method of claim 13 , wherein the plungers move through apertures of the elevator.

16. A system for feeding sheets in a document reproduction device, comprising:

an elevator system whereby at least one sheet is carried vertically to an upper portion of a feedbox system;

a system for sensing sheet position comprising a plurality of sensors at the upper portion of the feedbox;

a data processing system for receiving and processing data from the system for sensing sheet location; and

an actuating system for receiving data from the data processing system, whereby

the actuating system causes a sheet to be substantially flat;

the actuating system comprises a single actuating device connected to a plurality of plungers;

a feeding system captures and receives the substantially flat sheet;

the plurality of sensors comprises at least four sensors located at positions corresponding to at least four different edges of the sheet;

the four sensors are configured to measure a height of the sheet at the corresponding edge of the sheet;

each one of the plurality of plungers contacts a portion of the sheet;

the plurality of plungers are constructed to independently adjust the height of the sheet where the plurality of plungers contacts the portion of the sheet; and

the plurality of plungers adjusts the height of the corresponding portion of the sheet until the four sensors measure the height of the sheet to be the same at each sensor.