Reversible winding system for exchangeable bobbins

摘要

The pull cords (6) of a removable concertina blind (7), to the ends of which touch-and-close band strips (4) are fastened, are wound onto bobbins (2) which are covered with a corresponding (for example, tufty part/touch-and-close part) touch-and-close band (3). The winding bobbins (2) are mounted on a shaft (10) which is supported in bearings (9) connected firmly to the building. The mounting and dismounting of the concertina blind take place by respectively applying and lifting off the touch-and-close band strips (4) onto and from the touch-and-close band coverings (3) of the bobbins (2). The same principle of a reversible winding system can be used in general, for example on ink-ribbon spools for typewriters. Bobbins strips of a flexible material which are adhesively bonded to the shaft (10) can also be used as spools, and the total width of the strips is less than half a shaft circumference and the strips have in each case two parallel flat projections projecting at right angles to the shaft axis. <IMAGE>