US3750806A - Feed mechanism for presses - Google Patents

Feed mechanism for presses Download PDF

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Publication number
US3750806A
US3750806A US00186722A US3750806DA US3750806A US 3750806 A US3750806 A US 3750806A US 00186722 A US00186722 A US 00186722A US 3750806D A US3750806D A US 3750806DA US 3750806 A US3750806 A US 3750806A
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United States
Prior art keywords
workpiece
calipers
assembly
base
reciprocation
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Expired - Lifetime
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US00186722A
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English (en)
Inventor
L Bartleet
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Unisoc Machine Tools Ltd
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Unisoc Machine Tools Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/02—Advancing work in relation to the stroke of the die or tool
    • B21D43/04—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
    • B21D43/10—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by grippers

Definitions

  • FEED MECHANISM FOR PRESSES a press comprising a base and a reciprocable feeding [75] inventor: Leslie John Bartleet, Walsall, assembly
  • the feeding assembly embodies P England means arranged to engage the lowermost workpiece 1n a stack of workpieces situated in a hopper on the base Asslgnefi Unis Machine Tools Limited, so that on reciprocation of said assembly, the pusher Brownl'lills, W LE s means pushes said lowermost workpiece forwardly to [22] Filed: Oct 5, 1971 an intermediate station on the base.
  • the feeding assembly also includes a pair of calipers adapted at their leading ends to move between open and closed positions so that in the closed position a workpiece previously de- [30] Foreign Appncaflon Priority Data posited at said intermediate station will be gripped by the calipers and moved forwardly to the press in which 211 App].
  • ABSTRACT A feed mechanism for feeding workpieces separately to &
  • This invention relates to a feed mechanism for use in feeding a succession of separate workpieces to a power press or the like, the object of the invention being to provide such a mechanism in an improved form.
  • a feed mechanism for presses comprising a base and a reciprocable feeding assembly, said assembly embodying pusher means comprising a pair of fingers which are arranged so that they each extend in a direction generally parallel to said direction of reciprocation and which, on reciprocation of said assembly, engage the edge of the lowermost workpiece of a stack of workpieces which are disposed in use over said base so as to push said lowermost workpiece forwardly to an intermediate station on said base, there being provided on said base an upwardly extending projection which is disposed beneath a hopper adapted to hold said stack of workpieces and which is arranged in use to engage the underside of said lowermost workpiece at the rear thereof so as thereby to raise the rear of the workpiece relative to the front, said fingers being arranged so that their leading ends are separated to define a slot which receives said projection as the fingers are advanced, said feeding assembly also embodying a pair of calipers which each extend in a direction which is parallel or substantially parallel to the direction of reciprocation of said feeding assembly, means
  • FIGS. 1 and 2 are respectively a part-sectional side view and plan view of one example of a feed mechanism in accordance with the invention
  • FIG. 3 is a side view, on a smaller scale, showing the feed mechanism connected to a press which is to be fed, and
  • FIG. 4-7 are diagrammatic plan views illustrating the sequence of operation in a working cycle of the feed mechanism shown in FIGS. 1-3.
  • the press feed mechanism shown therein is provided with a base or platform mounted on a support 11 which can be attached to a press to which it is required to feed individual workpieces which may be in the form of flat blanks or which may be in the form of partly raised components.
  • Said base and its support are connected together whereby the position of the base can be adjusted as required and when in use the upper surface of said base will be arranged at a vertical height which is level or just above the upper surface of a lower die mounted in the press and in which it is required to locate the workpiece.
  • the mechanism is also provided with a reciprocable feeding assembly 12 which is movable towards and awy from the press by any convenient means such as pneumatic piston and cylinder unit 13.
  • Said feeding assembly includes a pair of fingers 14 and 15 which may be integrally connected together at their rearward ends but which are arranged so that their leading ends 14a and 15a are free and separated from each other so that a gap or slot exists between the two fingers at least part way along their lengths from the lading end thereof. Furthermore, when the feeding assembly is in its rearward position the leading ends of said fingers will be spaced some distance rearwardly of a hopper 16 that is mounted in use above the rearward end of said base. It is incidentally to be noted that in the views shown in FIGS. 1 and 2 the workpieces will be fed in a direction from right to left and the terms leading and rearward are to be construed accordingly.
  • the hopper 16 is conveniently formed by a plurality of vertically extending pins 17 which serve to locate a stack of workpieces 18 which are to be fed and on the base is disposed a plurality of strips 19 which each extend in a direction generally parallel to the direction of reciprocation of said feeding assembly, each strip 19 extending from a position beneath said hopper 16 to a position adjacent to the forwad end of the base, said latter position providing an intermediate station (indicated by reference numeral 20 in FIG. 2) as will be hereinafter described. Furthermore, each of said strips 19 is of tapered form in side elevation so that its thickness diminishes towards said intermediate station (see FIG. 1).
  • a short pin 21 which is arranged to pass down the'aforementioned gap between the leading ends 14a and 15a of said pair of fingers on the feeding assembly as the latter moves forward.
  • the pin 21 engages the underside of the lowermost workpiece 18 in the hopper at the rear thereof so that said workpieces are slightly tilted with their rearward portions being slightly higher than their forward portions but the leading ends 14a and 15a of said fingers are arranged so that they will engage the rear most edge of the lowermost workpiece without projecting above said workpiece whereby said workpiece can be separated from the stack of workpieces above it.
  • the fingers l4 and 15 will carry the separated lowermost workpiece forwardly to the aforesaid intermediate station 20 at or adjacent to the forward end of the bse l0 and will leave the workpiece in the intermediate station as the feeding assembly next returns rearwardly in its cycle of reciprocation.
  • a spring-loaded and adjustable arresting bar 22 which is disposed just above the base 10 and which is arranged to frictionally engage the upper surface of the workpiece as it arrives at the intermediate station in order to ensure that the workpiece is stopped and retained in the correct position.
  • the feeding assembly also includes a pair of calipers 23 and 24 which extend along opposite sides of the mechanism so that each caliper extends in a direction substantially parallel to the direction of reciprocation of the feeding assembly. Said calipers are pivotably connected towards their rearward ends to cross-pieces 25 and 26 which can be laterally adjusted in guides 27 in order to vary the lateral setting of said calipers. Between the pivot of each caliper and its rearward end there is provided one or more springs 28 which act to push the rearward end of the caliper inwardly and therefore the forward end of the caliper outwardly. Thus said springs 28 act to move the forward end of the calipers to a relatively open position as shown in FIG. 2. The forward end of each caliper is adapted to receive a removable gripping piece 29 shaped to suit the contour of a workpiece which is to be gripped.
  • Said mans includes a laterally extending bar 30 which is mounted on the reciprocable assembly so as to be movable through a short distance in a direction generally parallel to the direction of reciprocation.
  • said bar 30 may be provided with suitable downwardly extending legs which are connected to said assembly by means of pivots (not shown).
  • pivots not shown.
  • a pair of L-shaped levers 31 and 32 (see FIG. 2)-which are each pivoted to said cross-pieces 25 and 26 at the ends of said levers indicated by reference numerals 33 and 34 respectively.
  • a pin 35 or 36 which is arranged to engage the forward surface of said bar 30 and the other ends of said levers indicated by reference numerals 37 and 38 respectively are arranged to engage the inner surfaces of the rearward ends of the calipers 23 and 24.
  • the pins 35 and 36 will be similarly moved forward to pivot the levers 3H and 32 on their pivots 33 and 34 thereby causing the ends 37 and 38 of said levers to engage the rearward ends of the cal- I ipers 23 and 24 and pivot said calipers so that the gripping pieces 29 will be moved towards each other to grip the workpiece previously deposited at the intermediate station 20, the springs 28 being compressed by such pivotal motion of the calipers.
  • a further piston and cylinder unit 39 (see FIG. 1) and the piston rod 40 of this unit extends forwardly and is connected to a cross-piece 41 having end portions 410 and 41b which engage the upper surfaes of levers 42 and 43.
  • Each of said levers 42 and 43 is pivoted about a horizontal axis which in the case of lever 43 is indicated by reference numeral 44 in FIG. I and furthermore each lever has a downwardly extending portion (indicated in the case of lever 43 by reference 45), together with an upwardly extending portion (indicated in the case of lever 43 by reference 46).
  • a coil spring 47 which surrounds the aforesaid piston rod 40 so as to engage at one end a part connected to the bar 30 and at the other end abracket 48 through which the piston rod 40 can slide.
  • the upwardly extending portions 46 of the levers 42 and 43 are connected as by means of bolts to said part connected to the bar 30.
  • the upper surfaces of the levers '42 and 43 at the leading ends thereof are inclined to the I horizontal so that when the piston rod 40 carrying with it the cross-piece 42 is moved forwardly from the position shown in FIGS.
  • the two units 13 and 39 are actuated by a pressurised fluid and are controlled by a series of valves which do not form part of the present invention.
  • a valve 49 which travels with the aforesaid reciprocable assembly and which is connected to the supply of pressurised fluid such as compressed air, said valve 49 controlling the admission of pressurised fluid to the unit 39.
  • valve 49 At the forward end of the stroke of the reciprocable assembly said valve 49 is engaged by another fixed abutment (not shown) which is arranged to exhaust fluid from the unit 39.
  • FIG. I further valves 50 and 51.
  • the downwardly extending portion 45 of the lever 43 carries an abutment 52 which is adapted to engage the valve 50 when said lever 43 is pivoted consequent upon the piston rod 40 and cross-piece 41 moving forwardly.
  • the valve 50 controls the admission of pressurised fluid to the piston and cylinder unit 30 to carry the reciprocable assembly forwardly.
  • the unit 13 will not be actuated until the unit 39 has been actuated to pivot the lever 43 as aforesaid.
  • the forward ends of the calipers 23 and 24 will be moved into their closed position to grip a component at the intermediate station 20 before the unit 13 is actuated to carry the reciprocable assembly forwardly.
  • valve 49 At the forward end of the stroke of said assembly the valve 49 is actuated as previously explained to exhaust the unit 39.
  • the spring 47 then returns the levers 42 and 43 to the positions indicated in FIG. I so that the bar 30 will be moved to its relatively rearward position thereby permitting the forward ends of the calipers to open under the influence of springs 28.
  • the workpiece or component carried forward from the intermediate station 20 by the calipers will thus be deposited in the die of the press.
  • another component or workpiece will have been separated from the bottom of the stack in the hopper 16 by the leading ends 14a and 15a of said fingers l4 and I5 to deposit said other workpiece in the intermediate station.
  • the downwardly extending portion 45 of said lever 43 carries a further abutment 53 which is arranged, after the unit 39 has been exhausted (thereby causing the lever 43 to pivot to the position shown in FIG. I) to engage said valve 51 which is itself arranged to admit pressurised fluid to the other end of the unit l3 thereby effecting return stroke of said reciprocable assembly.
  • valve 54 which is engaged by a cam 55 so that when said cam 55 is clear of the valve 54 (in other words when the reciprocable assembly is at or near its rearmost position) the press to which the feeding mechanism is attached can be operated,- said valve 54 being connected in a hydraulie or pneumatic circuit which controls the operation of said press.
  • FIG. 3 is a side view showing a feeding mechanism as above-described attached to a press 56, the mechanism being additionally supported by an adjustable stand 57.
  • FIGS. 4-7 illustrate diagrammatically the various stages in the feeding cycle.
  • FIG. 4 there is initially no workpiece in the intermediate station indicated by reference numeral whilst the reciprocable assembly is in its rearmost position.
  • a workpiece 18a is carried forward from the hopper by the fingers to the intermediate statin 20 whilst thre is of course no workpiece to be carried forwardly by the calipers 23 and 24 into the die 58.
  • said calipers 23 and 24 are shown in the closed position just before they are opened prior to the return stroke of the reciprocable assembly.
  • FIG. 5 said calipers 23 and 24 are shown in the closed position just before they are opened prior to the return stroke of the reciprocable assembly.
  • said assembly has completed its return stroke and the calipers 23 and 24 have again closed after having been opened on the return journey of said assembly before the assembly is again ready to move forwardly.
  • another workpiece 18b is separated from the hopper and carried forward to the intermediate station as seen in FIG. 7 whilst the previously separated workpiece 18a is carried forward by the calipers 23 and 24 into the die 58.
  • the calipers will then open as previously described to deposit said workpiece 18a in the die prior to return movement of the assembly for picking up of the workpiece 181; and separation of yet a further workpiece from the hopper.
  • a feed mechanism for presses comprising a base and a reciprocable feeding assembly, said assembly embodying pusher means comprising a pair of fingers which are arranged so that they each extend in a direction generally parallel to said direction of reciprocation and which, on reciprocation of said assembly, engage the edge of the lowermost workpiece of a stack of workpieces which are disposed in use over said base so as to push said lowermost workpiece forwardly to an intermediate station on said base, there being provided on said base an upwardly extending projection which is disposed beneath a hopper adapted to hold said stack of workpieces and which is arranged in use to engage the underside of said lowermost workpiece at the rear thereof so as thereby to raise the rear of the workpiece relative to the front, said fingers being arranged so that their leading ends are separated to define a slot which receives said projections as the fingers are advanced, said feeding assembly also embodying a pair of calipers which each extend in a direction which is parallel or substantially parallel to the direction of reciprocation of said feeding assembly, means being provided to close the leading ends of
  • a feed mechanism as claimed in claim I wherein the base is provided with a plurality of spaced parallel strips which serve as guides over which a workpiece engaged by said pusher means can slide, said strips each extending in said direction of reciprocation and each bieng tapered so as to be of diminishing thickness towards the intermediate station.
  • a feed mechanism as claimed in claim 1 wherein means are provided for variably spacing said pair of calipers in a direction at right angles to said direction of reciprocation.

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US00186722A 1970-10-07 1971-10-05 Feed mechanism for presses Expired - Lifetime US3750806A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3966386A (en) * 1973-12-14 1976-06-29 Beyer Olsen Knut Machines for rotational moulding of plastic articles with article removal means
US4019361A (en) * 1975-02-13 1977-04-26 Siftelsen For Metallurgisk Forskning Manipulator for rolling mill
DE3238979A1 (de) * 1982-10-21 1984-04-26 Karl 2700 Wiener Neustadt Holik Vorrichtung zum beschicken eines automaten mit traegerplatten
US6112391A (en) * 1999-08-17 2000-09-05 Radocaj; Mijo Automatic loader-unloader for disk blank workpieces
DE102006020919A1 (de) * 2006-02-19 2007-08-30 Richter, Gerhard, Dipl.-Ing. (FH) Vereinzelungsvorrichtung mit Schubladenmechanismus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2659578B1 (fr) * 1990-03-14 1995-04-28 Peugeot Appareil d'alimentation automatique en flans de tole d'une presse ou autre machine quelconque.

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1051192A (fr) *

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1051192A (fr) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3966386A (en) * 1973-12-14 1976-06-29 Beyer Olsen Knut Machines for rotational moulding of plastic articles with article removal means
US4019361A (en) * 1975-02-13 1977-04-26 Siftelsen For Metallurgisk Forskning Manipulator for rolling mill
DE3238979A1 (de) * 1982-10-21 1984-04-26 Karl 2700 Wiener Neustadt Holik Vorrichtung zum beschicken eines automaten mit traegerplatten
US6112391A (en) * 1999-08-17 2000-09-05 Radocaj; Mijo Automatic loader-unloader for disk blank workpieces
DE102006020919A1 (de) * 2006-02-19 2007-08-30 Richter, Gerhard, Dipl.-Ing. (FH) Vereinzelungsvorrichtung mit Schubladenmechanismus
DE102006020919B4 (de) * 2006-02-19 2012-05-03 Gerhard Richter Vereinzelungsvorrichtung mit Schubladenmechanismus

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Publication number Publication date
FR2111652B3 (fr) 1973-06-29
FR2111652A7 (fr) 1972-06-09
GB1331085A (en) 1973-09-19

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