Apparatus for the control of two mechanisms for translational movement of a bar, including a first mechanism (6) for translational movement situated in a machine tool (4) for turning, and a second mechanism (18) for translational movement situated in an installation (1) for sequential loading of such bars in a tubular rotary part (3) of the machine tool (4)
- said first mechanism (6) being essentially made up:
- of a mechanical assembly which, called adjustable headstock (7),
- is guided translationally on the machine tool (4), along an axis of translation (8), and
- comprises a tubular part (3) which, driven rotatingly about an axis of rotation (9) parallel to the axis of translation (8), receives an end portion of the bar (2) and bears a radial holding clamp (10) for this end portion,
- of a driving means (11), called first driving means, which is controlled by a first control means (12), following two opposite directions (S1, S2) so that in the course of each machining cycle of a part (5), the mechanical assembly, called adjustable headstock (7), can undergo translational movements,
- said second translational movement mechanism (18)
- being intended to ensure functions of translational movement of a bar (2) so as to be able to obtain, especially, the thrust of the bar (2), sequentially, through the tubular rotary part (3), until a given number of parts (5) have been made, a second translational movement mechanism (18), within the loading installation (1),
- including driving means (22) of the type controlled by steps,
- the apparatus (21) for the control of the two mechanisms called first and second being characterized in that it comprises:
- a first element (23) consisting of an elongated ruler which includes at least a plurality of marks (230) successively disposed along its longitudinal dimension for defining a given step and indicating distinctly two opposite directions (S1, S2) of reading this first element (23) along its longitudinal dimension,
- a second element (24) consisting of a detector of marks (230) borne by the first element (23), this second element (24), on the one hand, detecting each step of a relative movement between the first element (23) and the second element (24), as well as the direction of this movement and, on the other hand, developing a signal of step and of direction of movement,
- a third element (25) and a fourth element (26), each for fixing of one of said first element (23) and second element (24), one on the adjustable headstock (7), the other on a stationary part (100) of the loading installation (1), said third element (25) and fourth element (26) being disposed in such a way that any translational movement of the adjustable headstock (7) brings about a relative translational movement between the first element (23) and the second element (24), which is of identical value and identical direction to those of the relative movement of this adjustable headstock (7),
- a fifth element (27) for applying to said second driving means (22) of the second translational movement mechanism (18), within the loading installation (1), the signal of step and of direction of movement developed at the level of the second element (24) so as instantly to control said second driving means (22) of the loading installation (1) according to each step detected and to the direction of movement detected.