GB672315A - Die stamping presses and die wipers therefor - Google Patents

Abstract

672,315. Die-stamping presses; inking apparatus. STEFFENS, R. N. Jan. 4,1950, No. 178/50. Class 100 (ii). In a die-stamping press having an endless die wiper belt for removing excess ink from the die or printing plate, the belt is passed through tensioning means which applies tension to a portion only of the belt leaving the remaining portion substantially free from tension, the tensioned part being arranged to pass over the die when necessary for removing surplus ink therefrom. The die 29 is mounted for horizontal reciprocation on a bed 12 of a machine frame 11, 13, 14 by means of pivoted arms 28, 27, a slot 26 therein being engaged by a follower 25 on a shaft 23 rotated through gear wheels 17, 21 and 22 (not shown), from a shaft 18, the die 29 passing a wiper pad 41, round which is passed the wiper belt 42, to a position where it receives ink from a roller 32 which receives ink from a roller 31 rotating in an ink pan 30. The roller 32 which is on an arm 33 is given an oscillatory motion from a cam 36 on shaft 18 through bell crank 34 and pivotally connected arms 38, 39, the arms 33 and 39 being fixed to pivots on an extension 14a of the machine frame. A cam 16 is mounted on the frame 14 and is given vertical reciprocatory movement from shaft 18 through links 20 secured eccentrically to discs 19 at either end of shaft 18. The wiper belt 42 is fed intermittently by a roller 44 on a shaft 43, an opposed roller 45 being journalled in slidable bearing blocks 46 mounted on frame 14 and pressed towards roller 44 by springs 47, an adjusting screw 48 being provided. The shaft 43 is rotated intermittently from the shaft 18 by chain 52 and sprocket wheel 51, on frame 14a, which is rotated on the up movement of an eccentric arm 53 on gear wheel 21 through a pawl on a swivel member 54 engaging a ratchet wheel in its shaft 51a. The belt 42 is fed over the pad 41 from left to right as seen in Fig. 2 and passes through ink removing appliances to the tensioning device 59, the remaining portion passing over idler rollers 93, 94 on frame 13, with a weighted roller 95 taking up slack between them, and thence to an idler roller 49 leading to feed rollers 44, 45. The tensioning device comprises rollers 65a, 66a which are rotated at a greater speed than rollers 44, 45, the rollers 65a, 66a being connected by gear wheels 72 and operated through chain 75 and gear wheel 74 on shaft 43, the gear wheel on shaft 66 being relatively small. The shafts 65, 66 are journalled in bearing blocks 64, 67 in slots 63, 62 respectively in a framework 60, 61 secured to the frame 13, the slot 62 allowing movement of the bearing blocks 67 which are interconnected by a member 68, against which bears a screw 69 which can be operated from outside frame 13 to press the rollers 65a, 66a together to give the required spacing. Removing ink. The tensioned part of the belt 42 passes through an ink solvent receptacle 77 on a projection 75b of frame 13, the belt first passing over a roller 112 moistened with the solvent, over scrapers 84a, 83a, round a roller 92 immersed in the solvent and against which it is pressed by a folded over felt member 125, and finally past scrapers 81a, 82a one either side thereof to remove the solvent, any ink and solvent removed by scrapers 81a, 82a or 83a returning to receptacle 77 and moistened ink from scraper 84a falling to ink receptacle 30 thereunder. The scraper blades, as 81a, are each secured to a block 88 by screws through an overlying cover plate 90 and each block fits removably in an aligned slot, as 81, in a frame 77a, the blades being arranged as shown so that the belt is flexed to assist the scraping action. The roller 112 is rotatably mounted in slots 110 at the top of a casing 106 in which lie a set of wicks communicating with a solvent receptacle 103 which receives the solvent through a conduit 118 from receptacle 77, the casing 106 being removably and adjustably mounted on brackets 100 secured to the frame 77a.