Abstract: A method and a microfilm camera for detecting codes applied to original copies being screened in the camera in which a code reader detects the codes, and a counter and comparison device is provided, which is connected to the code reader and is adjusted to a predetermined number of the copies. Two intermediate memories are connected to the counter and comparison device. The memories count and store marks for the blip types and codes from the code reader, respectively. The code value, the blip mark value and the copy number value are compared in the counter and comparison device and when coincide, a copy supply which was previously stopped is switched on again.

Abstract: To monitor the picture taking of documents in a camera assembly including a paging device and an exposure device, the documents pertaining to a partial stack of documents are provided with serial page numbers within a digital range assigned to the partial stack. In the exposure device the film pictures are exposed with a blip sign whose shape is assigned to the processed digital range. During the passage of respective documents through the assembly, an electronic control generates in the respective paging and exposure devices binary coded first and second signals assigned to the digital range of the serial numbers and to the corresponding blip signs. The first and second binary coded signals are applied via evaluation units and a comparator into an intermediate memory.

Abstract: A copying machine has plural infeed capabilities, being provided for example with plural sheet supply units supplying sheets of different respective types or formats. A control panel is provided with a plurality of operator-activated dual-purpose select-and-start switches. When the operator activates one of these switches, this both selects the respective infeed capability and also commands initiation of copying, so that the operator need not thereafter press a second switch merely to initiate copying. The select-and-start switches are pushbutton switches the pushbuttons of which are translucent and provided, behind them, with respective signal lamps. During a copying operation, the signal lamp behind the one of the select-and-start switches which commanded copying lights up, to indicate that copying is occurring. If one of the supply units is exhausted, the respective signal lamp begins to blink, thereby indicating this to the operator.