US 5,111,725 A · Scrap ejector for rotary die cutting apparatus

Abstract

The scrap ejector has a relatively long and thin body made of stainless steel or other resilient and durable material. The leading end portion of the body overlies and is secured to the outer surface of the die roll. In its undeflected condition, the trailing end portion of the body is spaced radially from the die roll. In one embodiment the body has a pad of compressible elastomer upon the surface thereof distal from the die roll, and in another embodiment the body has an arcuate portion projecting from the aforesaid surface of the body. During passage of the scrap ejector through the nip between the die and anvil rolls engagement between the anvil roll and the resilient pad (in the first embodiment) or the arcuate portion (in the second embodiment) deflects the trailing end portion of the body to a position wherein its terminal end is closely adjacent the surface of the die roll and the leading surface of the cutting rule which trims the leading edge portion of the paperboard stock. Upon passage from the nip, the leading end portion of the body springs outwardly and ejects from the apparatus the scrap material produced by the trimming operation. The edges of the body preferably are rounded and smooth.

Claims16

Dependent claims

A rotary die apparatus having a die roll and an anvil roll mounted in generally parallel relationship to each other for rotation in opposite directions and defining a nip therebetween, said die roll having a cutting rule extending outwardly from the outer surface of said roll for, in cooperation with said anvil roll, cutting material off of the leading edge portion of paperboard stock passing through said nip between said rolls;

and a scrap ejector for ejecting said material away from said paperboard stock following cutting thereof, the improvement comprising:
said scrap ejector including an elongated flexible body having a leading end portion, a trailing end portion, and resilient compressible means projecting away from said die roll and toward said anvil roll, said leading end portion of said scrap ejector being connected to said die roll adjacent said outer surface thereof and passing through said nip between said rolls prior to said trailing end of said scrap ejector, said trailing end portion of said body of said scrap ejector normally being spaced outwardly from said outer surface of said die roll, and being movable toward said die roll surface by engagement of said resilient compressible means with said anvil roll during passage of said scrap ejector into said nip between said rolls.

Dependencies are inferred from the claim text.

Scrap ejector for rotary die cutting apparatus

Life of this patent

Scrap ejector for rotary die cutting apparatus

Life of this patent

Abstract

Claims16