Patent GB-219758-A (GB)
Title: Improvements in and relating to platen printing presses
IPC: B41F1/26
Filed: 1923-05-09
Abstract: 219,758. Haddan, R., (American Type Founders Co.). May 9, 1923. Platen machines.-Platen printing- presses, more pajticularly of the Chandler or like type, are constructed so as to be readily converted from hand to automatic feed, and vice versa, by constructing the feed and delivery mechanism so as to be capable of being put out of operation, the feed-mechanism comprising a pile support which is normally inclined, but which can be swivelled about a horizontal axis to a horizontal position and then moved about a vertical pivot at one side of the support out of operative position, carrying with it a sheet-transfer mechanism which normally assists in the feed of the sheets to the platen. The sheets 52 are registered by side and front stops on a board 40, supported by adjustably mounted side supports 41 on a table 24 pivoted at one edge about a vertical pivot 25 carried by a support 22 pivoted about a horizontal pivot 21. The pile table is normally maintained in its operative position by a lever 28 with a curved operating-handle pivoted to the support 22 and to a link 31 fitted with a stop-pin 34, the whole forming a toggle system which in the position shown in Fig. 4 holds the table 24 in operative position. By moving the lever 28 to the position shown in dotted lines in Fig. 4, the toggles assume a second stable position with the table 24 raised to the horizontal position and the table can then be swung in a horizontal plane about the pivot 25 out of operative position, and a handfeed table substituted. The table 24 carries with it the sheet transfer device shown in Fig. 3, which normally feeds the sheets, as released by sheet separators 53, to the platen 6. The transfer device is pivoted about a shaft 81, so that it can be folded back when hand-feed is desired, and it comprises supports 108, side guides 109, and a roller 84 which advances the sheet over the space between the transfer device and the platen. One of the side arms 83 of the transfer device carries an adjustable cam 100 which can be set to control the position of the device relatively to the platen. Normally the transfer device is raised and lowered by a roller 105 on a link 106 operated by the platen and connected to a fixed link 108, the roller 105 acting on a projection 104 on one of the arms 83 of the transfer device to cause the oscillation of the arms 83. In the case of short sheets the cam 100 is set so as not to contact with the frame, so that the arms 83 fall to their full extent, and a short gap is left between the transfer device and platen 6. If long sheets are used, the cam 100 is adjusted to keep the roller 84 further from the platen in its lowered position. The roller 84 is mounted so as to be driven from the cam-shaft 12 of the platen, which drives a roller 88 mounted in a spring-controlled arm 91. The drive is transmitted to shaft 84 by a roller 85 on it and fibre rollers 86, 87 mounted in a spring-controlled plate 96, the roller 86 being freely mounted in a slot and resting by gravity on both rollers 85, 87. The sheet-separating device acts as described in Specification 219,917.