Patent ID: 7686289

Claim:
A vertical collating machine comprising: a frame; a plurality of sheet feeding units attached to the frame and arranged in a vertical direction at spacing therebetween, the sheet feeding units being operative for feeding sheets from respective sheet outlets one by one; a vertical sheet conveyance path provided on the frame and arranged oppositely with the sheet outlets of the sheet feeding units; conveyance means installed on the frame for sequentially receiving the sheets from the respective sheet feeding units and conveying the sheets vertically downward along the sheet conveyance path; each of the sheet feeding units having a sheet ejector for horizontally discharging the sheets one by one, and a sheet feeding means arranged between the sheet ejector and the sheet conveyance path for changing the direction of the sheets horizontally discharged from the sheet ejector so as to feed the sheets vertically downward from the sheet outlet to the sheet conveyance path; the sheet feeding means comprising a pair of a drive roller and an idle roller which are respectively arranged for rotation about horizontal rotation axes and contact with each other, whereby the sheets discharged from the sheet ejector are sequentially conveyed between the drive roller and the idle roller so as to be fed in the sheet conveyance path; the conveyance means comprising a conveyer belt provided on the frame and having a conveyance plane extending in a vertical direction along the sheet conveyance path, and a conveyance roller arranged oppositely with the conveyance plane of the conveyer belt and brought in contact with the conveyance plane; control means for controlling the sheet feeding units and the conveyance means in such a manner that the sheets fed from the sheet feeding units are conveyed while a sheet fed from a next lower sheet feeding unit is at least partially overlapped with a sheet fed from an upper sheet feeding unit; each of the sheet feeding units having an imaging means positioned at a downstream side of the sheet outlet of the sheet feeding unit and arranged oppositely with the sheets conveyed on the sheet conveyance path; and the control means comprising a display and operation portion having a display portion for displaying image data of images captured by the imaging means, scroll buttons for scrolling the images displayed on the display portion, and a decision button for determining a search pattern in the images displayed on the display portion for each of the sheet feeding units, the search pattern consisting of an image portion in which color data of pixels comprising the images is significantly changed, and a random access memory (RAM) for storing image data of the search patterns, the control means being operative for detecting collation errors during collation operation by comparing the image data captured by the imaging means with the image data of the search pattern stored in the RAM for each of the sheet feeding units so as to determine whether or not the search pattern is contained in a respective sheet.