Patent Application
20130152662
The present invention relates to a machine for bending a material having the shape of a wire as a tube having a vertical movement of the spar by the use of a pantograph lifting device, advantageously reducing the number of devices used for lifting said spar and increasing the lateral stiffness of the machine.
It is known, the machine for bending of a material having the shape of a wire, such as the tube, it is equipped with a spar on which a positioner of the material having the shape of a wire is installed to be bent, hereinafter named tube, a core pull for said tube, the bending head placed at one end of said spar.
To proceed to bend the tube by the bending head equipped with appropriate means, the tube to be bent, housed in the positioned, must be placed in a given position with respect to the bending head. This placement has obtained moving the spar vertically: for clarity, the applicant brings out that the above vertical direction of the spar has to be identified with respect to the surface on which the whole machine is placed obviously. The known bending machines perform this movement by using a large number of devices.
Said known bending machines solve the problem of moving the spar vertically with a vertical wall equipped with special devoted lifting devices of the spar. These lifting devices are positioned on the wall and they hook the spar lifting it at the desired quota. Other machines known solve the same problem by some U-shaped structures, at least two, also equipped with lifting devices of the spar.
According to this other known solution, the spar under reference is placed into said U structures and it is lifted to the desired quota by the lifting means of which the U structures are equipped.
Known handling systems of the spar have the inconvenience of having to employ a large number of devices to accomplish the aforementioned vertical movement of the spar.
The large number of these devices has the disadvantage of the cracks and the difficulty of synchronizing the mentioned devices and also they have high costs.
The present invention solves the problems of the prior art advantageously through the adoption of a pantograph-shaped device placed under the spar and it is suitable to move said spar vertically.
The handling device of the spar having pantograph shape, briefly hereinafter pantograph, it includes at least two couple of crossbars. The pairs of the crossbars are placed so as to form at least two parallel X, at least connected by a central pivot. The extremes of the parallel X, formed by the crossbars making up the pantograph are connected by at least two couple of pins each other parallel and also parallel to the surface on which the machine is placed. The pins placed near to the bending head of the machine have a limited mobility. Said pins have only vertical mobility and this mobility is reserved to the upper pins preferably and the lower pin cannot change quota.
Rear pivots of the pantograph have also movement, in particular the lower pin can move only horizontally while upper pin has vertical and horizontal movement.
The handling constraints to the mentioned pins of each pantograph advantageously allow to move the spar vertically without having it translated horizontally too, advantageously avoiding having to compensate for the position of the tube.
The movement devices having the pantograph shape are usually driven by a hydraulic cylinder which pushes the extremes of said pantograph. This cylinder is controlled by a hydraulic station, but unfortunately this station is too bulky and therefore it is not favorable because it increases the area occupied by the machine in an unacceptable manner.
To solve this problem, the pantograph object of the present invention is driven by a controlled axis pushing the extremity of the pantograph. This movement is accomplished by an electric motor that can be precisely controlled. Said motor is connected to a mechanical system of translation, preferably a screw. That screw can have a fine pitch to allow even micrometric movements.
Said pair of crossbars are placed in the way to form two parallel X, connected by a central pin (9). Said crossbars have the ends connected by a pair of parallel front pins (101, 102) and a rear pair of pins (111, 112). These pins have a limited mobility.
The front pins (101, 102) have a mobility vertical only which is not represented graphically, preferably the upward mobility is reserved for upper pin (101) exclusively.
The rear pair of pins (111, 112) has a movement, not represented graphically, the horizontal upper rear pivot (111) has also a vertical movement.
The drive of the device (6) due to which the spar (2) is raised vertically it is given to a controlled axis (12) capable of pushing at least one rear pin (111) and/or (112).
The controlled axis (12) includes an electric motor (13) controlled by a mechanical system of translation (14) preferably, which is a screw preferably.
With reference to
| Number | Date | Country | Kind |
|---|---|---|---|
| MI2011A002305 | Dec 2011 | IT | national |
