Turning – Lathe – Having hollow cutter head
Patent
1998-04-28
2000-05-02
Pitts, Andrea L.
Turning
Lathe
Having hollow cutter head
82131, 82 702, 82 98, 82 56, B23B 512
Patent
active
060558938
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention concerns a machining unit with a rotating head supporting at least two pairs of pivoting tools for the manufacturing of a non-rotating piece centered along the axis of the rotating head, comprising: a spindle integral with this head, the rotor being provided with an axial conduit for a guiding cylinder of a wire to be machined, and coupled with means for providing rotational drive, to the spindle or the rotating head, to pivot around respective axles extending parallel to the rotation axis, each support comprising a transversely arranged command lever, and including a rotating command element, that is axially movable in the rotor, and coupled to means for axially moving a command sleeve, and pairs of support members respectively arranged on each command lever and on the corresponding rotating element, each pair of support members including a directing surface and a support surface supporting itself against the directing surface, in a variable position, in relation to the movement of the rotating command element, said directing surface being located on the tool support and the corresponding drive surface being located on the rotating command element, and each directing surface corresponding to a pivoting tool support having the shape of an helical portion whose axis coincides with the pivoting axis of the said support.
DESCRIPTION OF THE RELATED ART
The machining head of this type, described in the international publication WO 91/14527, includes a spindle tool carrier equipped with four tools linked in pairs, each pair being controlled by a numbered axis.
This configuration imposes the use of a relatively advanced control mechanism whose price is high.
This constitutes a major inconvenience and prevents the production of a machine having a relatively low cost of manufacture. In order to alleviate this inconvenience, the present invention proposes to produce a spindle having four coupled tools, but where only one pair of tools can be operate at a time. The selection of the pair of tools, with which machining must be performed, must be able to be selected during rotation of the spindle which carries these tools.
BRIEF SUMMARY OF THE INVENTION
This aim is achieved by the machine unit according to the invention wherein the command sleeve is mounted coaxially on said spindle, in order to slide axially and to occupy a primary position, a secondary position and a middle position, this sleeve having two ellipsoidal drive surfaces at one of its extremities, designed to cooperate with the helical directing surfaces of the drive members and to execute the plunge of the tools, and a phase displacement device designed to cause said command sleeve to rotate a predetermined angle around its axis.
According to a preferred embodiment, the means for axially moving the command sleeve includes a command lever pivoting about an axis mounted on a support fixed to the framework carrying the spindle, this lever comprising two drive nuts centered about axles and engaging respectively two grooves located on opposite sides of a sleeve mounted coaxially on the command sleeve.
The sleeve is preferably mounted on the command sleeve by means of two ball bearings with oblique preloaded contacts.
According to a particularly advantageous embodiment, the phase displacement device includes a pulley linked to the command sleeve by two cotter pins that assure a rotational coupling between said pulley and said sleeve and that allow the latter free to move axially, said pulley being coupled to a rotatable pulley mounted on a tubular support supporting a reverse pulley, mounted freely and linked to a drive pulley mounted on the spindle and driven by a drive motor.
The coupling between the pulley, linked to the command sleeve, and the rotatable pulley can be executed by means of a belt.
The coupling between the reverse pulley and the drive pulley can be executed by means of a belt.
The phase displacement device preferably includes means to change the angular position of the rotatable pulley relati
REFERENCES:
patent: 1797944 (1931-03-01), Dustan
patent: 2236944 (1941-04-01), Gerardi
patent: 2387290 (1945-10-01), Powell et al.
patent: 3038361 (1962-06-01), Holzer
patent: 5230266 (1993-07-01), Glomb et al.
Esposito Antonio
Piguet Pierre-Louis
Esco S.A.
Pitts Andrea L.
Tsai Henry W. H.
LandOfFree
Machining unit with a rotating head does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Machining unit with a rotating head, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Machining unit with a rotating head will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1585507