Patent GB-981233-A (GB)
Title: Exposure apparatus
IPC: G03B27/12
Filed: 1962-12-18
Abstract: 981,233. Feeding and delivering sheets. CHEMISCHE FABRIEK L. VAN DER GRINTEN N.V. Dec. 18, 1962 [Dec. 27, 1961], No. 47747/62. Headings B6B and B6H. [Also in Division G2] An apparatus comprises means for feeding one or more sheets simultaneously to a cylinder, a movable blocking device which in one position stops the sheet(s) and in the other position allows the sheet(s) to be carried on to the cylinder, means for separating the sheets after leaving the cylinder, guide members which return the first sheet after separation to the cylinder, a trip member in the path of the first sheet which releases the movable blocking device, a movable deflecting member which in one position causes the first sheet (after separation) to move to the guide members and in the other position deflects the first sheet to an ejection station, a detector in the feeding section which responds to the presence of a sheet in that section and means for passing this response to the movable deflecting member thus locating this member in the returning position and where no sheet is present, locating this member in the ejecting position. As shown, the light-sensitive material and original moving on belt 2 pass under detector 12 which is displaced and as detector 12 is connected to deflecting member 15 via lever 13, spring 18 and lever 17, member 15 is moved to the returning position (cf. Fig. 2, not shown). The sheets are stopped by blocking member 20 on shaft 10. Depressing key 31 on lever 28 raises member 20 by means of pin 29 and lever 30, thus allowing the sheets to pass through rollers 7 and 24 and round transparent exposure cylinder 1. Depressing key 31 also causes lever 27 to catch lever 16 thus moving deflecting member 15 into ejecting position (cf. Fig. 3, not shown). Box 38 is connected to the blowing side and box 39 is connected to the suction side of an air pump (not shown). Air is blown out through vents 43 and through slits 41 and 42. The air flow through 41 causes the sheets to leave cylinder 1 and travel along belt 2. The air flow through 42 creates a partial vacuum between belt 2 and box 38 thus causing the original to be drawn along box 38 whereas the light-sensitive material is held to belt 2 by suction-box 39. The original is deflected by member 15 on to table 37. However, if more than one copy of the original is required, a lightsensitive sheet is fed on belt 2 under detector 12 which is moved and causes deflecting member 15 to move into returning position. The original thus moves from box 38 through guides 35 and 36 contacting leg 23b of tumbler 23, located in a groove in roller 24, turning the tumbler so that leg 23a meets pawl 21 thus raising blocking member 20 so that the light-sensitive material and original are super-imposed through rollers 7 and 24. If a large number of originals are to be copied and only one copy of each is required, key 31 is fixed in the depressed position. In an alternative embodiment not shown, detector 12 on shaft 8 may be coupled to an electric switch and deflecting member 15 is coupled to an electromagnet. On moving the detector, the switch closes and excites the electromagnet causing member 15 to move to the returning position. Specification 925,437 is referred to.