Machine with intermittently rotary workpiece-holding table for working and assembly of high-precision pieces

Abstract: The machine comprises operating units (18, 18') placed above, below and laterally to the rotary table. The control of the advances of the operating units with vertical axes comes about by levers (1, 1'), controlled by disks (2,2') in turn driven by a cam (15) having opposite profiles so as to control said disks (2, 2') in the opposite direction. The extent of the advance of operating units (18, 18') is varied individually by moving fulcrums (4, 4') of said levers (1,1').

Description: This invention has as its object a intermittently rotary workpiece-holding table for working and assembly of high-precision pieces. From the EP-A-0083304 it is known a machine with an intermittently rotary workpiece-holding table for working and assembly of high-precision pieces, comprising operating units placed above, below and laterally with respect to the rotary table, the control of the advances of the operating units with vertical axes coming about by levers controlled by elements which in turn are driven by a cam having opposite profiles so as to control said elements in the opposite direction. The machine according to the present invention differs from the cited prior art in that, in order to vary the curve representing the relationship between the advance of said operation units and the angular movement of the cam during a single complete stroke, two fulcrum for each lever are provided, the first one, being used in a first and last work phase, the second one being used in a second work phase. The accompanying drawings (figg. 1, 2, 3, 4, 5) represents a preferred nonlimiting embodiment of the machine according to the present invention. Shaft 6 (fig. 1), connected to motor 7 by gears 11 and 12, controls Maltese cross device 8, 9 which transforms the continuous rotary movement into an intermittent movement to drive workpiece table 10. A second shaft 13 integral with motor 7 carries a cam 5 which drives disks 2 and 2' by rollers 14, 15. Cam 5 exhibits two opposite profiles so that disks 2,2' are moved in opposite direction. Said disks act on levers 1, 1' which in turn control, by pawls 17, 17' (see also figures 3 and 4), the operating units with vertical axes 18, 18'. Operating units 18, 18' in turn are driven by belts 19, 19' by motors 20, 20' or can be equipped with incorporated motors. The extent of the advances can be varied individually for each operating unit, by moving fulcrums 4a, 4a' - 4b, 4b' of levers 1,1'. For the efficient use of said machine, it is provided to vary curve 23 (fig. 5) which represents advance "a" of the work units, with respect to angular movement "s" of cam 5 (fig. 1), in curve 24, by using in a first and last work phase (AB-DE, fig. 5) first fulcrum 4a, 4a' and in a second work phase (BD) a second fulcrum 4b, 4b' of said levers 1, 1', while the first fulcrum is removed from its support.

Claims: Machine with an intermittently rotary workpiece-holding table (10) for working and assembly of high-precision pieces, comprising operating units (18,18') placed above, below and laterally with respect to the rotary table (10), the control of the advances of the operating units (18,18') with vertical axes coming about by levers (1,1') controlled by elements (2,2') which in turn are driven by a cam (5) having opposite profiles so as to control said elements (2,2') in the opposite direction, characterized in that , in order to vary the curve (23) representing the relationship between the advance (a) of said operation units (18,18') and the angular movement (s) of the cam (5) during a single complete stroke, two fulcrum (4a, 4b), respectively (4a', 4b') for each lever (1, 1') are provided, the first one (4a,4a') being used in a first and last work phase (AB-DE fig. 5), the second one (4b,4b') being used in a second work phase (BD).

Inventors: BORLIN GIULIO, BUZZI UGO, BORLIN, GIULIO, BUZZI, UGO
Applicants: MIKRON SA, MIKRON S.A.
Application year: 1990
Main classification: B23Q39
IPC codes: B23Q35, B23Q39, B23P21, B23Q5