Stacking module with air streams

Patent metadata

Field	Value
Publication number	US-11198580-B2
Application number	US-201916563543-A
Country	US
Kind code	B2
Filing date	Sep 6, 2019
Priority date	Sep 6, 2019
Publication date	Dec 14, 2021
Grant date	Dec 14, 2021

Abstract

An apparatus is disclosed. For example, the apparatus includes a paper feed to feed print media a single sheet at a time, a plurality of rotating discs, wherein each one of the plurality of rotating discs comprises an elastomer ring to secure a leading edge of the single sheet against a registration wall and initiate a flipping process, a curved baffle positioned above the plurality of rotating discs and the single sheet, an air duct located above the plurality of rotating discs and the single sheet to force an air flow towards the curved baffle, wherein the air flow follows a shape of the curved baffle to create a low pressure zone above the single sheet to keep a trailing edge of the single sheet levitated during completion of the flipping process, and a movable platform to hold a stack of the print media.

First claim

What is claimed is:

1. An apparatus, comprising:
a paper feed to feed print media a single sheet at a time;
a plurality of rotating discs, wherein each one of the plurality of rotating discs comprises an elastomer ring to secure a leading edge of the single sheet against a registration wall and initiate a flipping process;
a curved baffle positioned above the plurality of rotating discs and the single sheet;
a first air duct located above the plurality of rotating discs and the single sheet to force an air flow towards the curved baffle, wherein the air flow follows a shape of the curved baffle to create a low pressure zone above the single sheet to keep a trailing edge of the single sheet levitated during completion of the flipping process;
a movable platform to hold a stack of the print media;
a plurality of second air ducts located between the plurality of rotating discs; and
a respective curved baffle located adjacent to each one of the plurality of second air ducts located between the plurality of rotating discs.

2. The apparatus of claim 1 , wherein the first air duct further comprises:
a blower to generate the air flow; and
a valve coupled to the blower and the first air duct to control the air flow.

3. The apparatus of claim 2 , further comprising:
a sensor to detect when the single sheet contacts the registration wall during the flipping process.

4. The apparatus of claim 3 , wherein the valve opens in response to a detection signal generated by the registration wall to allow the air flow to be forced through the first air duct.

5. The apparatus of claim 3 , wherein the valve closes when a detection signal is not generated by the registration wall to prevent the air flow from being forced through the first air duct.

6. The apparatus of claim 1 , wherein the first air duct comprises an air knife.

7. The apparatus of claim 1 , wherein an amount of the air flow comprises approximately 15-20 cubic feet per minute (cfm).

8. The apparatus of claim 1 , wherein a second air flow through the plurality of second air ducts causes the single sheet to move towards the plurality of rotating discs.

9. The apparatus of claim 1 , wherein the print media comprises paper having a weight of less than 50 grams per square meter (gsm) and a length of less than 20 inches.

10. A method for flipping print media in a stacker module, comprising:
activating, by a processor, a blower to generate an air flow while a valve is in a closed position;
activating, by the processor, a paper feed to feed a single sheet of the print media in a stacker module;
initiating, by the processor, a rotation of a plurality of rotating discs each having an elastomer ring to catch the single sheet of the print media to initiate a flipping process;
receiving, by the processor, a signal from a sensor that a leading edge of the single sheet is contacting a registration wall;
opening, by the processor, the valve in response to the leading edge of the single sheet being detected against the registration wall to force the air flow through an air duct towards a curved baffle positioned above the plurality of rotating discs and the single sheet to create a low pressure zone about the single sheet to keep a trailing edge of the single sheet levitated during completion of the flipping process; and
opening, by the processor, a second valve in response to the initiating the rotation of the plurality of rotating discs to force air flow through a second air duct located between the plurality of rotating discs and towards a second curved baffle to pull the single sheet towards the plurality of rotating discs.

11. The method of claim 10 , further comprising:
detecting, by the processor, that the trailing edge has exited a paper feed; and
closing, by the processor, the valve to prevent the air flow through the air duct.

12. The method of claim 11 , further comprising:
moving, by the processor, a movable platform that holds the single sheet lower to receive a subsequent single sheet of the print media; and
repeating, by the processor, the activating the paper feed, the initiating the rotation, the receiving a signal from the sensor that the leading edge of the single sheet is against the registration wall, the opening the valve, the detecting that the trailing edge has exited the paper feed, and the closing the valve for the subsequent single sheet of print media until stacking of the print media is complete.

13. The method of claim 10 , wherein the opening the second valve is performed before the opening of the valve in response to the leading edge of the single sheet being detected against the registration wall.

14. The method of claim 10 , further comprising:
closing, by the processor, the second valve after the receiving the signal from the sensor that the leading edge of the single sheet is contacting the registration wall.

15. The method of claim 10 , wherein an amount of the air flow through the air duct and the second air duct is a function of a weight and a length of the single sheet of the print media.

16. The method of claim 15 , wherein an amount of the air flow through the air duct and the second air duct comprises a range of approximately 15-20 cubic feet per minute (cfm).

17. The method of claim 15 , wherein the weight comprises less than 50 grams per square meter (gsm) and the length comprises less than 20 inches.

18. An apparatus, comprising:
a paper feed to feed a single sheet of paper at a time, wherein the paper weighs less than 50 grams per square meter (gsm) and has a length of at least 19 inches;
a plurality of rotating discs, wherein each one of the plurality of rotating discs comprises an elastomer ring, wherein the plurality of rotating discs rotate approximately 180 degrees to secure a leading edge of the single sheet against a registration wall and initiate a flipping process as the single sheet is fed through the paper feed;
a blower to generate an air flow;
a first curved baffle located between the plurality of rotating discs;
a first air duct located between the plurality of rotating discs;
a first valve coupled downstream of the blower to control a first portion of the air flow through the first air duct in response to initiation of rotation of the plurality of rotating discs to pull the single sheet towards the plurality of rotating discs;
a second curved baffle positioned above the plurality of rotating discs and the single sheet;
a second air duct located above the plurality of rotating discs and the single sheet; and
a second valve coupled downstream of the blower to control a second portion of the air flow through the second air duct in response to the leading edge contacting the registration wall, wherein the second portion of the air flow creates a low pressure zone above the single sheet to keep a trailing edge of the single sheet levitated during completion of the flipping process.

Assignees

• Xerox Corp

Inventors

• Ruiz Erwin
• Terrero Carlos M
• Irizarry Roberto A
• Batchelor Glenn David
• Tanchak Rachel Lynn

Classifications

• B65H2301/4461

  by blowing air towards handled material · CPC title

• B65H2801/06

  Office-type machines, e.g. photocopiers · CPC title

• B65H29/18

  and introducing into a pile · CPC title

• B65H2301/333

  Inverting · CPC title

• B65H29/248

  with coanda effect (separating from a stack B65H3/14) · CPC title