FR2589785A1 - CONTINUOUS STROKE ADJUSTMENT FOR EXCENTRIC PRESSES - Google Patents

Abstract

THE INVENTION CONCERNS A DRIVE DEVICE FOR A CONTINUOUS STROKE ADJUSTMENT FOR ECCENTRIC PRESSES. THE ADJUSTMENT IN ACCORDANCE WITH THE INVENTION PRESENTS A TORQUE OF SATELLITE WHEELS 6; 7 GUIDE ON A TOOTHED WHEEL 9 SERVING AS A SATELLITE DOOR AND MOUNTED IN ROTATION ON THE STUD 4 OF THE ECCENTRIC SHAFT. THE COUPLE OF SATELLITE WHEELS 6; 7 GEARS WITH TWO GEAR 5; 8 ONE OF WHICH IS SOLIDARITY OF THE ECCENTRIC SHAFT 1 AND THE OTHER MOUNTED IN ROTATION ON THIS SHAFT. THE TOOTHED WHEEL 5 JOINTLY WITH THE ECCENTRIC SHAFT IS A DOUBLE WHEEL WHICH ENGAGES AT THE SAME TIME WITH AT LEAST ONE OTHER GEAR STAGE 3; 5 USING THE ECCENTRICITY OF THE ROTATING AXLE OF THE ECCENTRIC SHAFT AS A CENTER. THE TOOTHED WHEEL 9 AND ANOTHER TOOTHED WHEEL 10 JOINTLY WITH THE ECCENTRIC SHAFT ARE COUPLED TO ANOTHER PLANETAR GEAR 18 THAT CAN BE DRIVEN THROUGH A SATELLITE CARRIER 17. THE CONTINUOUS STROKE ADJUSTMENT IN ACCORDANCE WITH L ' INVENTION CAN BE AUTOMATED AND REQUIRES FEW GEAR COMPONENTS.

Description

The present invention relates to a training device for a

continuous stroke adjustment of a

eccentric press.

  The eccentric presses and the stamping machines are characterized by the fact that one can regulate their

  race by turning the eccentric pad with

port to the eccentric shaft.

  In eccentric presses, an involuntary displacement of the eccentric cousinnet with respect to the eccentric shaft is avoided almost exclusively

  by a coupling by conjugation of form. The incon-

  important fact of this solution is that the mating parts of said coupling must be positioned

  relative to each other when mating.

  Achieving this positioning requires a significant expense, especially when it comes to ensuring

  high reproducibility for automation.

  Swiss Patent 541 734 discloses a solu-

  for the continuous stroke adjustment, in which a toothed wheel is integrally connected to the shaft

  eccentric, parallel to the axis of the bearing pad

  centric. A gear engaged with said gear is mounted in the eccentric bushing in such a way that

  that the rotation of said pinion is accompanied by a change

  position of the pad with respect to the eccentric shaft. Once the adjustment is made, the wheel

  toothed is tightly secured against the neck

  sinet of eccentric using T-screws that are

  retained in a concentric circular groove.

  This solution is however only suitable for

manual call.

  The object of the present invention is to develop a continuous stroke adjustment, capable of being automated and requiring only a small number

of gear elements.

  According to an essential characteristic of

  vention, it is to obtain a continuous stroke adjustment that is self-locking despite the absence of a locking eccentric. The object of the invention is achieved by the fact

  that a cogwheel fulfilling the role of a -rte-

  satellite of a planetary gear is rotatably mounted

  on the eccentric shaft pin, said wheel guiding a double satellite wheel which meshes with

  two toothed wheels, one of which is mounted

  on the eccentric shaft and the other is mounted in

  rotation on said shaft. The toothed wheel rotates

  tion is in the form of a double wheel and meshes with at least one other gear stage, the latter using as eccentric

  the rotating axis of the eccentric shaft.

  The gear wheel serving as a planet carrier and a toothed wheel integral with the eccentric shaft are coupled to another planet gear which can be

driven by a carrier.

  The stroke adjustment is performed in order to transmit the resistant torque. The means provided for rotating the eccentric bushing at the same time make it possible to obtain the coupling by means of a combination of shapes.

  between said pad and the eccentric shaft. The accou-

  the required form of conjugation between these dex

  the last elements are carried out using gear train

  self-locking swim. For this purpose only a small

  number of gear elements in the region where the

  cage occurs, which makes it easier to achieve the following adjusting elements. The big report of

  reduction is made in such a way that the holder

  the satellite connected to the drive remains stationary during the operation of the press, or is animated with a rotational movement causing a stroke adjustment, the latter being also possible when the

machine running empty.

  Other features and benefits of

  the invention will be better understood with the aid of

  following description of an exemplary embodiment, and with reference to the attached drawing in which: the figure schematically illustrates the principle

of the gear train.-

  The eccentric of the eccentric tree is

  place with the rotating shaft 1 of said shaft. At the eccentric bushing 2 disposed on the eccentric is associated a gear stage 3, the latter being in connection with a double gear wheel 5. Said gear 5 is

  mounted in rotation on the pin 4 of the shaft of ex-

  centric. Thus the eccentricity of the eccentric shaft defines the distance between the toothed wheel 3 and the

gear wheel 5.

  A pair of planet wheels 6 and 7 is engaged on the one hand with the toothed wheel 5 and on the other hand with a toothed wheel 8 disposed integrally on the trunnion 4, respectively. The pair of planet wheels 6 and 7 is guided by a toothed wheel 9 which at the same time functions as a carrier. Said toothed wheel 9 and another toothed wheel 10 integral with the pin 4 are engaged, with the same spacing, with the toothed wheels 11 and 12, the toothed wheel 11 being integral with the central shaft 19 and the toothed wheel 12 being secured to each other. of a hollow shaft 20 of a known planetary gear 18. Said gear 18 is composed of planetary wheels 13 and 16, planet wheels 14 and 15,

  as well as a satellite carrier 17 likely to be

  dragged. Between the planet wheel 6 and the toothed wheel 5, and between the planet wheel 7 and the toothed wheel 8 there is a small difference in the transmission ratios. This small difference in transmission ratios makes it possible to obtain a large overall

  reduction ratio. Thanks to this realization, the

  granulation of the type described becomes self-locking in the direction of the overdrive. If the pair of planet wheels 6 and 7 is provided with internal teeth, it is possible to have degrees of overlap which allow the transmission of the resistive torque with a reduced bulk and it is also possible to safely remove a locking coupling. by form conjugation which is currently still very common in eccentric presses. The result is a setting

continuous running.

  To move the eccentric pad 2 by

  compared to the eccentric tree, we take advantage of the pos-

  ability to cause differential movement between

toothed wheels9 and 10.

  If this differential movement between the gears 9 and 10 is printed or transmitted to the wheels 9 and 10, with a known value, by a planetary gear 18 by

  the gear wheels 11 and 12, with

  of the planet carrier 17, a drive is obtained

compared to the frame.

  During the operation of the press, the holder

  satellite 17 remains immobilized. Its rotation is

  translated by a change in the length of the race.

  The rotation of the planet carrier 17 can be transmitted by a proportional indicating device, or by an electronic processing device for a

automatic stroke adjustment.

Claims (1)

R E V E N D I C A T I ON   Continuous stroke adjustment for eccentric presses, characterized in that a pair of planet wheels (6; 7) is guided on a toothed wheel (9) serving as   carrier and mounted in rotation on the   one of the eccentric shaft (4), said pair of planet wheels meshing with two toothed wheels (5; 8) one of which is integrally mounted on the eccentric shaft (4) and another rotating on the eccentric shaft (4), the rotatably mounted wheel (5) being a double wheel which meshes with at least one other gear stage (3; 5) at the same time, the latter using as locating the eccentric of the rotating axis of the eccentric shaft (1), and in that the toothed wheel (9) serving as a planet carrier and a toothed wheel (10) integral with the shaft of eccentric are coupled to another planet gear (18) operable   via a carrier (17).