A stacking mechanism comprising: a rotatable screw with external thread of length L and pitch P1; a plurality of N traveling nuts mounted on the screw, having internal thread of pitch P1 and external thread of pitch P2, P1>P2; an arrester preventing rotation of the nuts within a length L1 of th
A stacking mechanism comprising: a rotatable screw with external thread of length L and pitch P1; a plurality of N traveling nuts mounted on the screw, having internal thread of pitch P1 and external thread of pitch P2, P1>P2; an arrester preventing rotation of the nuts within a length L1 of the screw, while allowing sliding; and a threaded member of pitch P2 adapted to engage the external thread of the nuts within a length L2 of the screw. In a first position of the mechanism, the nuts are arranged over the length L1. Upon rotation of the screw, the nuts slide along the screw at rate P1 per 1 turn, transit from L1 to L2, and then slide within the length L2 at a rate P2 per 1 turn, thereby achieving reversibly a second position of the mechanism where they are arranged over the length L2, L2<L1.
대표청구항▼
The invention claimed is: 1. A stacking mechanism comprising: a rotatable screw with external thread of length L and pitch P1; at least one traveling nut mounted on said screw, said traveling nut having internal thread of pitch P1 and external thread of pitch P2 coaxial with said internal thread, P
The invention claimed is: 1. A stacking mechanism comprising: a rotatable screw with external thread of length L and pitch P1; at least one traveling nut mounted on said screw, said traveling nut having internal thread of pitch P1 and external thread of pitch P2 coaxial with said internal thread, P1>P2; an arrester adapted to engage said traveling nut so as to prevent rotation thereof within an axial length L1 of said screw, while allowing said traveling nut to slide along said screw; a threaded member with internal thread of pitch P2 adapted to engage the external thread of said traveling nut within an axial length L2 of said screw, said length L2 being adjacent to said length L1; and at least one component to be stacked, each component corresponding to one of said nuts and being attached thereto; so that, by means of continuous rotation of said screw in one direction, said traveling nut can slide along said screw within said length L1 at rate P1 per 1 turn of the screw under the action of said arrester and said thread with pitch P1, can transit smoothly and reversibly from L1 to L2, and can slide with rotation along said screw within said length L2 at a rate P2 per 1 turn of the traveling nut under the action of said thread with pitch P1 and said thread with pitch P2. 2. The stacking mechanism of claim 1 used for stacking shutter members of a shutter mechanism, wherein a plurality of N traveling nuts are mounted on said screw; said N nuts are arranged at intervals W1i, i=1, 2, . . . , N−1, within said length L1 in a first position of said mechanism so that, by means of continuous rotation of said screw in one direction, said traveling nuts can slide along said screw, can transit smoothly and reversibly from L1 to L2, and can achieve reversibly a second position of said mechanism where said N nuts are arranged at intervals W2i, i=1, 2, . . . , N−1 within said length L2, where W2i<W1i and L2<L1. 3. The stacking mechanism according to claim 2, wherein said arrester is an elongated member parallel to said screw, each of said traveling nuts has a notch parallel to said screw, and said elongated member is received in said notch while said traveling nuts are within said length L1. 4. The stacking mechanism according to claim 3, wherein each traveling nut comprises a connection element mounted thereon for free rotation and adapted to carry a non-rotating shutter member while traveling within said length L, and said threaded member has a cutout allowing said connection element to travel together with the traveling nut thereof within said length L2. 5. The stacking mechanism according to claim 4, wherein said threaded member is a toothed rack parallel to said screw, the teeth of said rack constituting said thread with pitch P2. 6. The stacking mechanism according to claim 5, wherein said connection element comprises a ring with an inward rim and a radial pin externally attached to said ring, the respective traveling nut has an annular channel at an external surface thereof, and said rim is engaged in said channel so that the ring can rotate freely about the nut but can not be displaced axially therefrom while said pin is mounted to said non-rotating shutter member. 7. A stacking assembly, comprising two stacking mechanisms, each stacking mechanism comprising: a rotatable screw with external thread of length L and pitch P1; at least one traveling nut mounted on said screw, said traveling nut having internal thread of pitch P1 and external thread of pitch P2 coaxial with said internal thread, P1>P2; an arrester adapted to engage said traveling nut so as to prevent rotation thereof within an axial length L1 of said screw, while allowing said traveling nut to slide along said screw; and a threaded member with internal thread of pitch P2 adapted to engage the external thread of said traveling nut within an axial length L2 of said screw, said length L2 being adjacent to said length L1; so that, by means of continuous rotation of said screw in one direction, said traveling nut can slide along said screw within said length L1 at rate P1 per 1 turn of the screw under the action of said arrester and said thread with pitch P1, can transit smoothly and reversibly from L1 to L2, and can slide with rotation along said screw within said length L2 at a rate P2 per 1 turn of the traveling nut under the action of said thread with pitch P1 and said thread with pitch P2; said two stacking mechanisms being disposed substantially opposite one another, and further comprising elements to be stacked spanning therebetween, each element being attached to a corresponding nut on each of said stacking mechanisms.
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