초록 ▼

A paperboard blank processing apparatus including a rotatably mounted processing head for operating upon successive paperboard blanks is disclosed. A paperboard blank registration sensor is provided upstream from the processing head for detecting a preprinted registration mark on a surface of an app

A paperboard blank processing apparatus including a rotatably mounted processing head for operating upon successive paperboard blanks is disclosed. A paperboard blank registration sensor is provided upstream from the processing head for detecting a preprinted registration mark on a surface of an approaching paperboard blank. A controller is responsive to the registration sensor for determining whether the approaching paperboard blank is in proper registration with the rotary processing head. A registration correction window is defined by the controller and includes upper and lower limits defining upper and lower maximum correction values for bringing the angular position of the processing head into proper register with the linear position of the approaching paperboard blank. The controller further defines an averaging window containing the registration correction window wherein the registration correction window may be shifted within the averaging window in response to consistent registration errors.

대표청구항 ▼

[ What is claimed is:] [1.] A paperboard blank processing apparatus for working successive paperboard blanks, said paperboard blank processing apparatus comprising:a rotatably mounted processing head defining a nip for operating upon a downstream paperboard blank;a drive operably connected to said p

[ What is claimed is:] [1.] A paperboard blank processing apparatus for working successive paperboard blanks, said paperboard blank processing apparatus comprising:a rotatably mounted processing head defining a nip for operating upon a downstream paperboard blank;a drive operably connected to said processing head for driving said processing head in rotation at a predetermined line speed;a conveyor immediately upstream from said nip for conveying said downstream paperboard blank to said processing head, said conveyor operably connected to said processing head wherein said conveyor operates consistently at substantially said line speed of said processing head;sensor for detecting an upstream paperboard blank located upstream from said conveyor and providing a signal indicative of said upstream paperboard blank;wherein a distance between said sensor and said nip is greater than a distance between a trailing edge of the downstream paperboard blank and a leading edge of the upstream paperboard blank; anda controller responsive to said signal for determining whether said processing head is in register with the upstream paperboard blank, said controller further comprising means for varying said line speed of said processing head and said conveyor in unison when said processing head is not in register with the upstream paperboard blank and said downstream paperboard blank is within said nip, thereby bringing said processing head into proper register with the upstream paperboard blank while simultaneously maintaining proper register between said processing head and the downstream paperboard blank.