| 摘要 |
1277284 Facsimile systems GRAPHIC SCIENCES Inc. 19 Aug 1969 [19 Aug 1968] 41418/69 Heading H4F A drum type facsimile transceiver is provided with an "easy loading" system for loading and unloading documents and reproducing sheets on to the drum comprising a pair of cables wound in grooves at opposite ends of the drum and joined by cross-bars which hold documents against the drum, and means for engaging the cables to withdraw them from the drum to allow the document to be placed on or removed from the cross-bands. A document or sheet is held against the surface of the drum 14 by means of two cross-bands (18) secured to the cables 20 wound in grooves 108 in opposite ends of the drum. The crossbands are attracted towards the surface of the drum by means of permanent magnets embedded therein. One end of each cable 20 is secured to the drum and the other end is terminated by means of a spring-loaded pin 102 which hooks into an appropriately shaped notch (100) in the drum rim. The drum has an inner hub member 70, secured to a driving-shaft 73, and during transmission and reception the inner hub member 70 is locked to the outer hub member 72 of the drum by means of a spring-loaded plunger 82. A drawer 12 is positioned below the drum and carries a pair of pivoted arms 110 terminating in bifurcated hooks 102 and a cam surface 94. When the drum is to be loaded or unloaded the inner hub member 70 is locked in the angular position illustrated by releasing a solenoid 36 the armature 38 of which enters and locks in a recess 124 in the inner hub member. The drawer 40 is then pulled out, causing a wheel 92 on a lifter 90 to ride up the cam surface 94 on the drawer so that a projection 95 on the upper end of the lifter raises the plunger 82 to unlock the outer hub member 72. Simultaneously the arms 110 are lifted by means of pins 116 which slide along shaped slots 118 in cam-plates 120 secured to the main assembly so that the hooks engage pins 102 and unhook them from the notches (100) in the drum. The cables and cross-bands are then unwound from the drum by further outward movement of the drawer, the drum rotating relative to its inner hub against the force of a return spring 78. The sheet is then positioned on the cross-bands and the drawer returned so that the sequence of operations is reversed resulting in the cables being rewound and the sheet being wrapped around the drum which is rotated by the returnspring 78. A transducing head 24 is traversed along the length of the drum by means of a lead screw (28) and includes a photo-electric pickup and a pyrographic reproducing stylus 52. The head 24 also carries a normally closed microswitch 32 over which the breaking solenoid 36 is energized and an adjustable stop 34 is provided so that when the end of the document is reached the microswitch is actuated to terminate the transmission and to de-energize the solenoid to arrest the rotation of the drum. |
