(11) EP 1 270 105 A1


(43) Date of publication:
02.01.2003 Bulletin 2003/01

(21) Application number: 01500157.1

(22) Date of filing: 26.06.2001
(51) International Patent Classification (IPC)7B21D 22/14
(84) Designated Contracting States:
Designated Extension States:

(71) Applicant: ATFI Llobregat, S.L.
08970 Sant Joan Despi (Barcelona) (ES)

(72) Inventor:
  • Parellada Horta, JosĂ©
    08830 Sant Boi de Llobregat (ES)

(74) Representative: Carpintero Lopez, Francisco 
28014 Madrid
28014 Madrid (ES)


(54) Roller for spinning lathes

(57) The roller itself (6), in its axial orifice (9) for coupling to shaft (10), incorporates an intermediate perimetral ribbing (12) which acts as a spacer for the conventional pair of bearings (11-11'), so that the external bearing (11) is mounted on the external end of orifice (9) and is axially retained by the flange (13) on the end of shaft (10), while the inner bearing (11') is mounted on the inner face of the roller and is axially pressed against spacer (12) by a washer (14) which in the assembled configuration of the roller on the roller-bearing carriage rests laterally on the arm of said carriage while retaining it in an axial sense.



[0001] The present invention relates to a roller such as those used in spinning lathes, in which a chuck presses a disc-shaped metal sheet against a rotary mold and on which said sheet acts at least one roller mounted on a carriage with a programmed automated motion, so that said roller deforms the sheet against the rotary mold so that it adopts the shape of the latter.

[0002] The object of the invention is to provide a roller with great structural simplicity and simple assembly, with the ensuing benefits in the costs of fabrication and assembly and disassembly of the rollers.


[0003] In spinning lathes a power unit supplies a rotational motion to a mold shaped as a solid of revolution, so that on a single lathe may be implanted molds with different generatrices, depending on the desired shape of the sheet after spinning.

[0004] The sheet is initially flat and circular, and rests on its centre and axially on the mold, to which it is secured by a chuck which allows it to rotate freely when driven by the mold. On said sheet acts a roller which is rotationally mounted on a roller-bearing carriage, so that the roller follows the path of the mold generatrix with automated motions which correspond to a control program of said carriage.

[0005] Conventional rollers consist of two parts, the roller itself and a cover which is attached to it by bolts, so that these elements define an axial housing for a pair of bearings and the corresponding spacer placed between them. These bearings are obviously meant to allow a free rotation of the rollers about their axis, with the cover closing the roller housing after such mechanisms are installed inside it.

[0006] The complexity of this structure implies large machining costs, on one hand to obtain the two basic parts of the roller and in addition to drill said parts and thread one of them to allow the implementation of the attachment bolts, to which must be added the complexity of the assembly which results from this large number of components.


[0007] The roller for spinning lathes disclosed solves the above drawbacks in a fully satisfactory manner, providing a solution with a simple structure and assembly, with the ensuing reduction in costs.

[0008] For this purpose and more specifically, the roller consists of a single part, not requiring a cover nor any additional accessories for mounting the bearings, which is the only machined part of the assembly and which in the inevitable axial orifice for coupling to the shaft incorporates an intermediate narrowing which acts as a spacer for the conventional bearings, so that these are mounted on opposite sides of the roller, with the outer bearing axially retained by the conventional flange at the end of the aforementioned shaft, while the other bearing is also retained axially against the common spacer by a simple washer which remains in working position when said shaft is coupled and attached to the corresponding roller-bearing carriage.

[0009] In this way the conventional cover of the roller can be eliminated, as well as the drilled orifices required in these for installing them, allowing in addition a much simpler and faster assembly.


[0010] The characteristics of the present invention will be better understood in view of the accompanying drawings of a preferred embodiment of the invention, where in a non-limiting manner and for purposes of illustration only the following is shown:

Figure 1 shows a schematic representation of a spinning lathe with the roller object of the present invention.

Figure 2 shows a side elevation view and diametric section of said roller.


[0011] Figure 1 shows a schematic representation of a conventional spinning lathe which, as is conventional, comprises a rotary mold (1) driven by a power unit (2), which rotary mold in this case has a cambered hemispherical configuration but which may adopt any other shape depending on that intended for the sheet (3) to be spun, and which mold (1) is placed axially opposite a chick (4) which is aided by the corresponding driving mechanism (5), so that said chuck (4) can push the sheet (3) against mold (1) on its centre, keeping it perfectly held in place while the roller (6) acts, which mounted on a roller-bearing carriage (7) follows the generatrix line of the mold (1), for which purpose said roller-bearing carriage is provided with automated motion means and is duly programmed.

[0012] In accordance now with the invention, said roller (6) consists of a roller (6) itself, in a single part, with the classical rounded, operational perimetral edge (8) and with the also classical axial orifice (9) for passage of shaft (10) for coupling to the carriage (7), with a pair of bearings (11-11') interposed; also in accordance with the invention said roller (6) itself, at its mid area of its axial orifice (9), incorporates a narrowing (12), that is, an inner annular ribbing which acts as a spacer for bearings (11-11'), as shown clearly in figure 2.

[0013] The outer bearing (11) is retained against spacer (12) by flange (13) at the free end of shaft (10), while the internal bearing (11') is in turn retained axially against spacer (12) by a washer (14), which when the roller assembly is mounted on carriage (7) presses sideways on the arm (15) of said carriage, when the latter is finally secured by bolt (16).


1. Roller for spinning lathes, of the type in which the roller itself is provided with an axial orifice for passage, with an interposed pair of bearings, of the shaft by which said roller is rotationally mounted on the roller-bearing carriage, characterised in that the roller itself (6), in the mid area of its axial orifice (9), incorporates a narrowing which defines an annular ribbing (12) which acts as a stop spacer for the pair of bearings (11-11'), so that said bearings are mounted on the roller itself by its opposite sides, with the outer bearing (11) axially retained by the classical flange (13) of the roller shaft (13), while the inner bearing (11') is in turn retained axially against the spacer (12) by a washer (14) which rests against the corresponding lateral face of the arm (15) of the roller-bearing carriage (7) when the shaft (10) of the roller is finally secured to said carriage.


Search report