| 摘要 |
1,173,569. Ribbon bow-making machine. F. CHRISTENSEN. 18 Oct., 1966 [24 Oct., 1965], No. 46512/66. Heading B6G. A bow comprises a single length of ribbon formed successively into a series of loops each of which begins and terminates at the centre of the bow and with the same surface of the ribbon displayed externally in all of the loops, and means securing together the portions of the ribbon which are in overlapping relation where they cross each other at the axis of the bow, the initial loop being located at the centre of the bow and constituting an annular coil with a single turn formed of the ribbon so as to substantially cover and conceal from view the securing means, the rest of the loops being conical in form and being circumferentially spaced from each other successively about the axis of the how. A machine for making the bow comprises a bow-forming mandrel, means for rotatably mounting the mandrel, a plurality of needles extending axially from the mandrel, means for moving the mandrel axially, means for feeding a length of ribbon towards the mandrel and impaling the ribbon on the needles, means for fastening together permanently lengths of ribbon impaled on the needles, and control means operative to control the operation of the means for rotating the mandrel, the ribbon feeding and impaling means, the means for moving the mandrel axially and the ribbon fastening means. The ribbon feeding means comprises a ribbon shuttle which reciprocates towards and away from the mandrel in a plane at right angles to the latter, and means shifting the shuttle to a level above the needle as it approaches the mandrel and then downwardly when the shuttle arrives above the needle so as to impale the ribbon fed by the shuttle on to the needle. The shuttle is then allowed to retract in its return reciprocatory movement whereby the portion of the ribbon impaled on the needles is thus temporarily secured to the mandrel causing the ribbon in the shuttle to be paid out therefrom as the shuttle retracts. Air jet means is provided directing an air jet against the ribbon as. it is paid out from the shuttle and subsequently when the movement of the shuttle is reversed to form the length of ribbon thus paid out into a loop as the mandrel rotates during the loop forming sub-cycle. Means is provided for automatically controlling the angle of rotation of the mandrel in forming the loops, and causing the mandrel to rotate through an angle of approximately 360 degree during the first loopforming sub-cycle whereby a loop is formed in said said-cycle comprising a single-turn coil of ribbon which occupies the central area of the bow when this is completed and substantially covers the interior structure of the bow. This control means then causes the mandrel to rotate during sub-cycles following the formation of the central loop, through angles greater than 180 degrees, but less than 360 degrees, preferably within 200 to 235 degrees, whereby conoidal loops are formed during the subsequent sub-cycles, which are circumferentially spaced from each other about the axis of the bow. The securing means on the machine comprises an anvil formed on the mandrel and a stapling device which moves axially towards the mandrel to compress the overlapping portions of the ribbon in parallel on the needles as the needles retract and drive a staple through the overlapping ribbon portions of the bow and against the anvil to clench the staple in bind relation with the ribbon layers thereby permanently assembling the bow. Means is also provided for delivering a tab of paper which is surfaced with pressure-sensitive adhesive and applying the tab to the back of the bow so as to be secured to the bow by the securing means to provide a means for utilizing the pressure-sensitive adhesive for mounting the bow on an object. Means is also provided for automatically severing the ribbon between the shuttle and the bow coincidentally with the actuation of the securing means. The components of the machine are described in detail. |
