Patent GB-980177-A (GB)
Title: A high-speed electromagnetic printing mechanism
IPC: G03G19/00
Filed: 1961-05-17
Abstract: 980,177. High-speed selective printers. OLYMPIA WERKE A.G. May 17, 1961 [May 18, 1960], No. 17970/61. Heading B6F. A high-speed electromagnetic printing mechanism for line-by-line production of latent magnetic character images on a magnetizable carrier 7, Fig. 1, wherein field-forming types are used for producing the characters, comprises a plurality of electromagnets 1a which are associated with the printing positions of a line and arranged side by side in the direction of the line for selective energization by a memory store of a data processing machine and contain in their mutually aligned air gaps 5, a type carrier 3, carrying magnetically conductive types 4 adapted to move in the direction of the line and, to transmit during the movement of the type carrier, in predetermined printing positions, the latent character images corresponding to them to the magnetizable intermediate carrier 7 arranged in the said air gap. The printing mechanism in Fig. 1 comprises a set of electromagnets 1a arranged in a staggered formation and mounted on a common yoke 2, which is so connected by lateral yoke parts 2a and another yoke part 2b to a counterpole 2c common to all the magnets, that an air gap 5 is formed between the counterpole 2c and core 1, in which there is arranged a type carrier 3 carrying fixedly mounted types 4 of magnetically conductive material and spaced at distances corresponding to the printing positions. The types carry on that end which faces the magnetic foil 7 on which the latent magnetic characters are to be printed, their associated characters 6. In a second embodiment in Fig. 3 the cores of the electromagnets 11 and types 14 are built up of laminations to reduce the power required for magnetization and the gaps 19 and 18, respectively, left between them are filled with a selfhardening synthetic resin. The foil 7 is fed and carried away through two air gaps between poles 11b and 11a, respectively, a cancelling head 15 being provided to cancel any magnetization taking place in the feed gap. A guide roller 17 is provided for the foil 7. In a third embodiment (in Fig. 4, not shown) the types are arranged in the form of a U-yoke so that the foil 7 may be fed in a straight line across both air gaps between the poles of the magnets. In a fourth embodiment (Fig. 6, not shown) the types 14 may be replaced by types mounted fixedly on an endless carrier 54, Fig. 9, with guide means 68, 69 in the region of the air gaps, or the types may be mounted movably close to one another and held apart by spacers in a stationary endless conveying track (Fig. 7, not shown) and moved continuously in the air gap by means of toothed wheels engaging in corresponding recesses in the types, which may also be provided with running balls or rollers to reduce the friction on the conveying track. In a fifth embodiment in Fig. 10 the intermediate carrier consists of a drum 77, which may consist of magnetically conductive discs 77a carrying on their surface a storage layer and the type carrier 3 with types 4 is so arranged that its axis is parallel to that of the drum 77 and the carrier moves longitudinally between yokes 71a located opposite the type bars. A known dusting device 73 and a heated pressure roller 74 are provided for the transfer of the magnetic powder, adhering to the drum 77 at the magnetized parts, to a paper web 78. The dust removal and cleaning of the drum may be carried out in a known manner by a dust remover 76. Specifications 854,361, 854,362 and 890,218 are referred to.