FR2478513A1 - DEVICE FOR AUTOMATICALLY FEEDING BARS IN A MACHINE TOOL - Google Patents

Abstract

THE FEEDER INCLUDES A BAR 3 FOR STORING THE POWERED BARS AND A PARALLELEPIPEDIC GUIDE DEVICE AND PLANE REMAINING IMMOBILE DURING THE WORKING CYCLE OF THE MACHINE-TOOL POWERED UNTIL THE FALL OF THE END OF THE BAR ENDS THEM JAWS AND IS MOVED USING A PINION-RACK GEAR PLACED IN THE DEVICE 18, WHICH INCLUDES A TRACK FOR LIFTING AND LOWERING THE COVER 9 AND, SIMULTANEOUSLY, TWO TRACKS OF THE DEVICE FOR OPENING AND LOWERING CLOSURE OF THE JAWS, A RAMP SHOULDER ENSURING THE MOVEMENT OF THE BAR SEPARATORS 12.

Description

Various chargers or devices for feeding bars are known in

  different machine tools and which are more or less complex due to the particular machine supplied. For example, the loader intended for the continuous and precise feeding of automatic machines includes a lateral bar storage ramp, ending in a conduit where the bar is pushed back towards the machine.

by a drive element.

  Besides the own elements necessary to ensure the continuous pushing of the bar, we use a series of devices for the evacuation of the fall of the bar used and the installation of a bar separate from those stored on the ramp, all these operations being executed continuously and without

  interruption of machine tool operation, all available

  sitives being controlled by suitable electro-electronic means

or the like.

  The movements for the renewal of the bar require the intervention of a jaw holding the bar, the opening and closing of the duct cover where the bar to be machined is housed and the separation of the last bar from those placed on the ramp so that only the latter is introduced into said conduit, all by a series of movements perfectly and

  -nutually coordinated in time and space.

  In these known devices, said movements are

  obtained by a series of very complex arrangements such as

  both rotating cams, levers and springs whose movement, with inertia effect and others, is limited to a maximum rate that cannot be exceeded, which, due to the inherent complication and the multiplicity of mobile elements , made these devices

  inadequate for rapid and safe feeding of machines-

modern high-performance tools.

  The invention therefore provides improvements to this type of feeder, more particularly to the elements mentioned above, while retaining a bearing structure similar to that of known models, comprising two parallel sections with a duct.

  intermediate receiving the bar, and a lateral feed ramp.

  According to the aforementioned improvements made by the invention, it is

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  frames also parallel axes on said parallel sections

  leles and longitudinal one of which is secured by arms to said cover of the conduit so that their rotation ensures the opening

  and closing said cover to accommodate a new bar.

  On the other hand, one of the axes, placed under the feed ramp and parallel to the first, ensures, using an eccentric,

  the elevation of tenons, which, projecting to a morfent deter-

  mined, separate the lowest stored bar from the others and which

alone must fall into the conduit.

  In addition, above and below the central duct, the two elements of a jaw by assembling or separating

  tighten or release the bar, assuring tightening

  retaining just as well the restraint of the fall of a bar at the rear as the maintenance of the new bar until it is

hung by the pusher.

  All these mechanisms are controlled by a single device.

  set of guides or cam, of parallelepiped shape, placed between the two sections of the chassis under the advance duct so that the cam device carries, on one of its large faces, three

  cut guide or cam tracks, two of which are tapered and produced

  feels, using rollers, the opening or closing of the jaws, while the third ensures the raising or lowering of the cover

of the conduit.

  This guide or cam device on its face opposite to that mentioned above has a shoulder on one of its angles, so that using a lever is ensured the lifting of the separation pins of the bars comprising, on this same side, a rack which, by a pinion in a fixed position, moves the device automatically forward and backward in its path

  spare bar movements.

  These arrangements provide a whole series of improvements.

  rations both in the transmission and in the actuation of the various synchronized movements, as well as by the precise study

  velocities, accelerations and inertias.

  The objects and advantages of the invention will be better

  understood using the following description of a preferred example

  and drawings: attached, in which:

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  - Figure 1 is a front elevation view of a busbar feeder according to the invention; - Figure 2 is a cross section, larger

  scale, of the feeder of figure 1, where we see particular-

  the ramp 3 for lowering the bars with one of the separators 12 and the central duct 2 with its hinged cover 9; - Figure 3 is a detailed view of one of the levers 8 of articulation of actuation of the figure or cam 18; n of cover 9; - Figure 4 is a side view of the device t of the side shaft 7 raising the separators 12; - Figure 5 shows the attachment of the eccentric 14 4 to said shaft 7; - Figure 6 is a front view of the guide device - Figure 7 is a plan view of the device 18; - Figure 8 is a rear elevational view of the device 18; according to the line - Figure 9 the IX-IX of the - the figures is a sectional view of the device 18 Figure 6; lOa and lob are views of the ends of the mechanism for actuating the shaft 6 for raising the cover 9 of the duct 2;

  - Figure 11 is a cross section of the power supply

  header showing the assembly of the device 18 to the general frame of the apparatus; and rear of - Figures 12a and 12b are elevational views

two ends of the device 18.

  In these figures, we can notice the following elements: 1. Profiles 2. Bar inlet conduit 3. Ramp for lowering the stored bars 4. Frame arms 5. Arm supports 6. Cover articulation shaft 7. Separator drive shaft 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18.

19,20,21.

22. 23. 24. 25. 26. 26. 27.

28 and 29.

  30. 31. 32. 33. 34. 35. 36. Lid levers Lid Lid support Bar separator pusher S separator Separator return springs Eccentric ring Eccentric Dowel guide Thrust pin Guide device or control cam Paths of the device 18 'of guides forming a cam Shoulder Rack Guide roller Arm Elongated lug opening Lever Guide rollers Lower jaw element Upper jaw element Protrusion Spring Ring Guide bars Rack pinion The invention relates to an automatic bar feeder device, the assembly of which is shown in FIG. 1, and the b2ti of which comprises two parallel sections 1 on which is fixed a conduit 2 coaxial with the plate of the machine tool, and at

  through which the bar fed by a pusher is pushed back.

  FIGS. 1 and 2 show a lateral and inclined ramp 3 supporting arms 4 fixed to supports 5; the spacing of the arms relative to the ramp 3 can be adapted to bars

of different diameters.

3-O

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  According to the invention, the essential part of this feeder distinct from its actual frame, push elements, contacts or synchronization switches, etc. concerns the mechanism for changing the bar. can be divided into three sub-groups: movement of the cover 9 of the duct 2, hooking of the bar by the jaws 30 and 31 and separation of the

  last bar of ramp 3 compared to the others.

  We see in FIG. 2 two parallel shafts 6 and 7 among which the shaft 6 has integral levers 8 assembled by the other end to the cover 9 of the duct 2, so that an angular pivoting of the shaft 6 ensures, depending on the direction, the opening or closing of the covers 9 of the duct 2, allowing

  or preventing the entry of a new bar.

  A shaft 7 placed under the ramp 3, are assembled soli-

  duly eccentric pushers 11 acting on the lower part of the separators 12 housed in the lower parts of the ramp 3, the pushers I1 act against the return of the springs 13 to remove each separator 12 from the plane of the ramp 3 to spread the

  last bar and prevent others from falling.

  The separators 12, having a fixed and determined position on the ramp 3 in its lower part, cooperate with supports placed on the cover 9 of the conduit 2 so that between these supports 10, whose horizontal position is variable relative to the cover 9, the separators 12 delimit only the exact place

  of a bar whatever its diameter.

  The shaft 7 actuates the pushers 11 and comprises a ring 14 whose position is fixed at will (Figures 4 and 5) and supporting an eccentric 15 actuated by a stud 17 sliding in a transverse guide 16, the horizontal displacement of which ensures pivoting of the shaft 7 and thus the projection of the separators 12

  against the return springs 13.

  The advancement of the stud 17 is carried out by a device 18 of cam or guides of generally parallelepiped shape (FIGS. 6, 7, 8, 9); this device 18 has on one of its large lateral faces grooves of three guide tracks 19, 20 and 21, the first two corresponding to the opening and closing of the

  jaws 30 and 31 and the third 21 when the cover 9 is closed.

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  This device 18 further comprises on its other large

  surface a shoulder 22 of angle which produces the horizontal displacement-

  tal of said stud 17, which actuates the separators 12 and, in addition, a rack 23 meshing with a pinion 36 whose rotation produces the translational movement of the device 18. Similarly, on the surface of the device 18 comprising the rack 23, that -this frames cylindrical rings fitting onto two guide bars 35, parallel and fixed on one of the

  profiles 1 (Figure 12); these bars 35 thus allow a transla-

  tion of the element 18 between the two sections 1, being actuated by

  the pinion 36 placed permanently, which receives its movement from a motor-

  reduction gear automatically controlled by end stops,

or the like.

  On the lower path 21 (FIG. 6) of the device 18, comprising a horizontal span of final elevation, is maintained a roller 24 secured to an arm 25 which can slide vertically and

  is linked by a lug fitted into a slot 26 of a lever 27 solidly

axis or shaft 6.

  The advance of the device 18 produces at the end of the journey, by the roller 24 and the lever 27, the pivoting of the shaft 6, which (FIG. 2) is assembled to the cover 9, which is then moved away from the conduit 2 to allow the entry of a new bar and is

  then closed by the recoil of the device 18.

  On the cam tracks 19 and 20 of the upper part of the element 18 (FIG. 6) having a generally tapered shape, the rollers 28 and 29 are guided, the first of which is integral with a perpendicular bar which can slide vertically to actuate

the lower jaw 30.

  From mm.ne, the roller is integral with the perpendicular bar

  by an elongated central opening; the bar moves verti-

  wedging and comprises at its upper end a projection 32 framing, with an intermediate damping spring 33, the upper jaw 31 terminated in point in high hardness material, just as the lower jaw tightens the maneuvered bar,

without appreciable risk of wear.

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  -7 At the start of the translation of the device 18, the rollers

  28 and 29, respectively fitted into tracks 19 and 20, main-

  hold the jaw spacing (figure 11). When the device 18 advances, the tracks 19 and 20 move apart, which brings the upper-31 and lower 30 jaws closer together.

  fixing the fall of the old bar and opening after unsymmetrical

  only in the starting position (Figure 6) via tracks 19 and 20; however, the lower jaw 30 is moved more quickly and the two jaws open more, facilitating rapid fall of the bar overfall and greater ease

for the entry of the news.

  The described mechanism works as follows: while the bar is pushed back, the device 18 remains at rest. At the end of the use of the bar driven by the pusher through the

  line 2, a signal is produced ensuring the erasure of said push-button

  evening with the fall of the bar. During this removal at a specific time, the pinion 36 meshing with the rack 23 initiates the movement to the left of the device 18 from a position

  as shown in Figure 6.

  The initiation of the movement caused by the movement of the device 18 is due to its shoulder 22, the stud 17 guided by the guide 16 moving the shaft by the eccentric is as described above, the shaft causes the separators to exit 12, dismissing the

  last bar of the others remaining in the ramp 3.

  The translation of the device 18 on the tracks 19 and 20 closes the jaws 30 and 31 which catch the fall of the bar by removing it from the pusher and, shortly after, by opening in an asymmetrical sequence, drop said fall from the bar and

remain open.

  Then immediately, the track 21 thanks to the arm and to the lever 27 causes the shaft to pivot and cause the opening of the cover 9 secured to its supports 10, which by rising allow the last bar to fall into the duct 2, in occupying the place

from the previous one.

  At this point, the device 18 begins its translation in the opposite direction, being controlled by conventional automation, redoing the operations in the opposite direction, that is to say closing the cover 9 first then closing the jaws 30 and 31, so that the pusher then hooks a new bar. Right after,

  opening of jaws 30 and 31 and finally before stopping the movement

  ment of the device 18, the retraction of the stud 17 allows, by the return of the springs 13, the deletion of the separators 12 which drop

  a new bar in the waiting position.

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Claims (6)

R E V E N D I C A T I 0 N S   1. Feeder or automatic bar feeding device, characterized in that it comprises a cam or guide device, of generally parallelepiped shape and planar by one of its largest faces and throughout its length, having a rack - 1st which meshing with an output pinion of a geared motor activates a selective movement of advance and retreat of the guide device, which, on the other larger face, comprises several tracks or paths receiving corresponding rollers including one is used to establish the opening and closing of the cover of the conduit o an advanced bar is slid, while the other two rollers ensure the opening or closing of the jaws for hooking the bar, the guide device comprising a sloping area forming a cam and continuing on one of its largest faces, ensuring a   course which establishes the actuation of the separation mechanism tion of the powered bar.   2. Feeder according to claim 1, characterized in that the jaw actuation channels have a generally tapered shape, with a straight initial part, where the jaws remain open, followed by another which is arched and ensures the closing of the jaws and a final part which is straight and ensures their opening. 3. A feeder according to claim 1, characterized in that the channel ensuring the operation of the cover comprises a first straight part corresponding to the closing of the cover over the entire length of the guide device and a final part which is   arched corresponding to the opening of the cover.   4. Feeder according to any one of the claims   previous, characterized in that the guide device remains stationary in the operation of the powered machine and begins its movement when the drop of the bar used is at the level of the jaws, so that, in a first movement, the jaws are closed so that the pusher emerges from said bar drop and then open to drop this drop 24 78 5 13   and, finally, the cover is raised in order to allow the entry of a new bar whose admission determines the actuation of control elements such as limit stops, in order to reverse the movement of the device. guides to initiate a reverse cycle of the first. 5. A feeder according to claim 1 or 3, characterized in that the roller according to the actuation path of the cover is mounted on the end of a projection which, by the other end and using a device lug and pivoting element slot, actuates a lever integral with the shaft, which is also integral with other levers fixed to the cover to pivot the shaft for lifting or lowering the cover, the stops retaining the next bar on the supply rail being integral with this cover.   6. A feeder according to claim 1, characterized in that the separation mechanism of the advanced bar comprises lugs mounted on elements integral with the lower part of the loading ramp and which pass through it in order to ensure the separation of this bar in cooperation with return springs in the retracted rest position, the tenons remaining connected to said springs by levers secured to an axis maintained at the same time in its radial position by an element in contact with the guide device so that, at moment when the post is erased in the ramped part,   it allows the rotation of the shaft and the withdrawal of the separation pins.