Printing machine

Patent metadata

Field	Value
Publication number	US-9834015-B2
Application number	US-201615067873-A
Country	US
Kind code	B2
Filing date	Mar 11, 2016
Priority date	Mar 30, 2015
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

A printing machine includes a printing unit which performs printing while transferring a sheet at a printing transfer speed, a circulation transfer unit which receives the sheet after simplex printing and transfers the sheet by reversing the sheet upside down, during duplex printing; and a paper refeed unit which refeeds, to the printing unit, the sheet transferred by the circulation transfer unit after simplex printing, wherein the circulation transfer unit includes a reversing unit which receives the sheet at the printing transfer speed, reverses the sheet upside down by switching back the sheet and accelerates the sheet up to a circulation transfer speed which is higher than the printing transfer speed when sheet transfer is restarted after temporal stop in the switching back, and a horizontal transfer unit which transfers the sheet switched back by the reversing unit, at the circulation transfer speed.

First claim

What is claimed is:

1. A printing machine, comprising:
a printer which performs printing while transferring a sheet at a printing transfer speed,
a circulation receiver which receives the sheet after simplex printing and transfers the sheet and inverts the sheet upside down, during duplex printing, and
a paper refeeder which refeeds, to the printer , the sheet transferred by the circulation receiver after the simplex printing, wherein
the circulation receiver includes
a reverser which receives the sheet at the printing transfer speed, inverts the sheet upside down by switching back the sheet and accelerates the sheet up to a circulation transfer speed which is higher than the printing transfer speed when sheet transfer is restarted after a temporal stop for a predetermined time period during the switching back, the reverser changing the sheet speed from the printing transfer speed to the circulation transfer speed without increasing the sheet speed during a period after the simplex printing is performed by the printer and up to a time when the sheet reaches a location of the temporal stop, and
a high-speed sheet transferer which transfers the sheet switched back by the reverser, at the circulation transfer speed.

2. The printing machine according to claim 1 , wherein
the reverser switches back the sheet and accelerates the sheet up to the circulation transfer speed, by a single roller pair.

Assignees

• Riso Kagaku Corp

Inventors

• Shinohara Masaaki
• Shimoda Tomohiko
• Saito Tetsunori
• Aoki Kazuyuki
• Okamura Takuya

Classifications

• B41J13/0045 Primary

  concerning sheet refeed sections of automatic paper handling systems, e.g. intermediate stackers (printing on both faces B41J3/60) · CPC title

• B41J3/60

  for printing on both faces of the printing material · CPC title

• B65H5/36

  Article guides or smoothers, e.g. movable in operation · CPC title

• B65H5/062

  between rollers or balls · CPC title

• B41F21/00 Primary

  Devices for conveying sheets through printing apparatus or machines (through platen presses B41F1/28) · CPC title