Abstract: The invention concerns a system for monitoring the movement of goods inwa and/or outwards with the aid of characteristic markings, such as a bar code which is scanned by a reading pen. Each reading pen is connected by a terminal which has a display and keys for giving special signals by flexible connecting wires. Each terminal is connected via an infrared beam with a so-called converter and this is connected via connecting wires with a control center and a processor as well as a memory. The reading pen contains no electronic components, as small proportion of these are contained in the terminal while the by far greater proportion is contained in the control center with the related processor and memory.The signals from the reading pen transmitted to the control center and passed on to the processor and memory are also transmitted back to the terminal concerned where they appear in a display so that the person operating the lightweight reading pen can check them.

Abstract: Apparatus for eliminating play between two interengaged gear wheels (4,10) f a gear wheel transmission includes a pair of disc-like transmission elements (1,2) which may be embodied in different forms. In one form of embodiment the elements (1,2) comprise two single eccentrics which are arranged movably relative to each other and so as to constitute a double eccentric. The central axis (2M) of the eccentric (2) is concentric with respect to the axis of rotation (10D) of the gear wheel (10). The spacing of the axes of rotation (4D,10D) of the two gear wheels (4,10) is a function of the eccentricity of the double eccentric (1,2). A spring (12) is connected to both eccentrics (1,2) in such a way that the two eccentrics (1,2) are pivoted relative to each other by the spring force in a direction such that the total eccentricity increases and thus play between the gear wheels (4,10), which are connected to the two eccentrics (1,2), is removed.