US3529542A - Feed apparatus for presses or the like - Google Patents

Feed apparatus for presses or the like Download PDF

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Publication number
US3529542A
US3529542A US3529542DA US3529542A US 3529542 A US3529542 A US 3529542A US 3529542D A US3529542D A US 3529542DA US 3529542 A US3529542 A US 3529542A
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US
United States
Prior art keywords
crank
feed
drive
shaft
feed mechanism
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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English (en)
Inventor
Otto Rasenberger
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L Schuler GmbH
Original Assignee
L Schuler GmbH
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Filing date
Publication date
Application filed by L Schuler GmbH filed Critical L Schuler GmbH
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Publication of US3529542A publication Critical patent/US3529542A/en
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Classifications

    • 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
    • B21D43/08—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by rollers
    • B21D43/09—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by rollers by one or more pairs of rollers for feeding sheet or strip material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/444—Tool engages work during dwell of intermittent workfeed
    • Y10T83/4539—Means to change tool position, or length or datum position of work- or tool-feed increment
    • Y10T83/4541—With means to vary magnitude of work-feed increment
    • Y10T83/4549—By change in length of one member of feed-driving linkage

Definitions

  • Feed mechanism for step-by-step feed of metal strip or sheet to a press or like machine comprises means for varying the effective length of the step-by-step feed by introducing between the crank drive and the drive shaft for the feed rollers a four-point linkage, including a series of levers, one which is fast on the drive shaft, another lever being anchored to a fixed position, which is adjustable so that by adjusting the same the angular displacement of the drive shaft for each stroke of the crank can be increased or decreased.
  • This invention relates to a feed mechanism for step-by-step feeding of metal strip, or other sheet material in presses and stamping or like machines. More particularly it is concerned with a roller feed mechanism, in which a drive shaft has imparted to it a reciprocatory rotary motion through a given angle, the driving motion being derived from a crank drive.
  • the invention comprises the introduction of a four-point linkage drive between the crank drive and the drive shaft.
  • This arrangement has the advantage that, since the fourpoint linkage drive performs a circular movement about its fixed points, substantially larger angular movements of the rock arm and consequently larger angles of rotation of the drive shaft becomes possible.
  • the arrangement according to the invention permits of operating at angles of up to about l 8 ()f without t hg transmission giggles becomirrg-sounfavourable that the forces occurring attain prohibitive amounts.
  • the feed may be still further increased by inserting a relatively small step-up means downstream of the drive shaft.
  • the invention further relatesto feed mechanisms of the above described type which are adjustable in height in relation to the position of the crank drive in the-press for the purpose of correcting the height at which the strip enters the press tools, and/or in which the length of the feed step is adjustable.
  • these adjustments can only be made when a machine is stationary.
  • the effective crank radius or the effective length of the rock arm is varied, which means that when making a height adjustment on the feed mechanism the effective length of the connecting rod requires a corresponding adjustment.
  • drives have however been proposed which permit a fine adjustment when in operation.
  • the further problem underlying the invention therefore comprises improving known feed mechanism to overcome these disadvantages.
  • the position of the fixed point of the four-point linkage drive ismade adjustable.
  • the four-point linkage drive performs oscillating movements about its fixed point and the drive shaft, the oscillating movement can be commenced within a relatively large angular range without critical transmission angles for the forces occurring.
  • the magnitude of the oscillating movement does not, vary to any great extent in dependence on the commencement of the oscillating movement.
  • the distance between the crank drive and the drive shaft can therefore be varied within certain limits, and the smaller variations in the length of feed step then occurring can be compensated byaltering the, base length and/or also altering the position of the base.
  • the particular advantage of this construction lies in the fact that the fixed point of the linkage remains stationary when in operation so that' its position can bechanged even though the mechanism is in motion.
  • this fixed point of the linkage that is to say the bearing pin for a push rod in the four-point linkage drive, can be secured e.g.
  • the crank drive is so disposed that the path (connecting loop), through which the crank rod pivot remote from the crank disc, passes during the working stroke is elongatedand extends in a direction corresponding approximately to the direction of the alteration in position of the feed mechanism on correction of the entry height.
  • Favourable dimensions and force ratios are moreover obtained if in an embodiment of the invention the base of the four-point linkage extendsapproximately parallel to the elongated connecting rod loop.
  • a push rod which is pivoted at one end to the connecting rod connecting the crank rod pivot remote from the crank disc to the rock arm and at the other end to the fixed point, is longer than the rock arm fastened on the drive shaft.
  • the push rod is pivoted to the connecting rod at a point which, viewed from the fixed point, is
  • FIG. 1 is a rear view of a press having feed mechanism, the scale on which the press frame is shown being substantially smaller than the scale on which the feed mechanism is illustrated.
  • FIG. 2 is a side elevation corresponding to FIG. 1.
  • FIGS. 3 and 4 are diagrammatic views showing the geometrical conditions of the drive and the positionof the individual members of the mechanism invarious phases of operation.
  • FIG. 4 is a view similar to FIG. 3, showing theindividual parts in the position which they assume after adjustment in height of the feed mechanism.
  • a hydraulic press including a main frame indicated generally at 1, having a ram 10 and press table 11, on to which is advanced a metal strip shown in dot and dash lines at 9.
  • a main shaft 2 which extends transversely of the frame I, a crank disc 3 having a crank pin 4 the position of the crank pin from the axis of the shaft 2 being adjustably suitable fastening means.
  • a crank rod 5 which extends over substantially the entire height of the press, connects the crank 4 to a feed mechanism 6 including rollers 7 and 8 for advancing the strip 9 of material step-by-step into the press between the ram 10 and table I I.
  • the roller feed mechanism 6 is attached to the frame 1 by means such as slots 12' to permit of vertical adjustment, its height being adjusted by means of screw jack 12 and lock nut 13 to enable the gap between the rollers 7 and 8 to be set at exactly the right height, in relation to the tool (not illustrated), for the insertion of the strip 9.
  • Drive from the lower end of the crank rod 5 is transmitted through a pin 14 to a coupling rod 15, whose other end is connected at 20 to the free end of a rock arm 16 keyed on a drive shaft 18.
  • a push rod 17 is pivotally connected at 26 to rod and at its other end through an eccentric pin 21 on a disc 22, which is mounted for rotation on a shaft 19 forming part of the feed mechanism 6.
  • the angular position of disc 22 on shaft 19 is manually adjustable by a hand wheel 25 on a spindle 24 provided with a worm 23 acting on the toothed periphery of disc 22. Provision is made for fixing the hand wheel 25 in its various positions by means of a device (not shown). Viewed from the bearing pin 21, the pivot 26 lies (in the example illustrated) on the farther side of a line connecting the fulcrums l4 and and is at a shorter distance from the fulcrum 14 than from fulcrum 20.
  • the push rod 17 is about twice as long'as the distance between the pivot point 20 and shaft 18.
  • the parts 15, 16, and 17 form a linked quadrilateral, the base of which is the connection of the points 18 and 21.
  • crank I rod 5 The reciprocatory motion of the crank I rod 5 is transmitted to the rock arm 16 through the linked quadrilateral, the fixed point of which is formed by the bearing pin 21, so that the shaft 16 rotates to-and-fro through a predetermined angle of rotation during the oscillation of the crank rod 5.
  • a freewheel drive 27 which is constructed after the style of a clamp detent mechanism and which transmits the rotation of the shaft 18 in one direction of rotation to a skew gear 28 in mesh with a gear 29 from which drives is transmitted to roller 8 through a shaft 30.
  • the gear 29 meshes with a gear 31 on a shaft 32 which carries the roller 7.
  • the drive shaft 18 has an extension 33, which transmits the reciprocatory movement to a second roller feed mechanism.
  • This roller feed mechanism 38 disposed at the outlet side of the press.
  • This roller feed mechanism 38 has the same gears 28, 29, and 31, so that the operation of the two pairs of rollers on both sides of the press is synchronised.
  • the position of the eccentric bearing pin 21 on disc 22 and thus the fixed point of the fourbar linkage drive can be adjusted and consequently the base of the four-point linkage drive is varied.
  • This variation in turn effects a variation of the amplitude of oscillation of the arm 16 and consequently a variation in the length of the effective feed motion, without the machine having to be stopped.
  • FIGS. 3 and 4 The geometrical conditions of the linkage movement are illustrated in FIGS. 3 and 4.
  • the crank disc 3 rotates uniformly with the eccentric shaft 2.
  • the distance between the pin 4 and the axis of the shaft 2 constitutes the crank radius 34, which can be adjusted from zero to its maximum value. By making this adjustablility the coarse adjustment of the feed step length is effected. This adjustment is made while the machine is stationary.
  • the crank rod 5 transmits its oscillatory movement to the connecting rod 15. Provided that the bearing pin 21 is in the bottom position as illustrated, the pivot 14 travels through a flat, elongated connecting rod path 35.
  • the parts 5, l5, l6, 17, when the crank pin 4 is in the bottom dead centreposition, take up as shown in full lines in FIG.
  • the position of the connecting rod 15 corresponding to the bottom dead centre position of the crank is different.
  • the pivot 14 In the bottom dead centre position of the crank the pivot 14 is situated in position 14", the pivot 26 at the position 26", and the 'pivot 20 at the position 20".
  • the position of the pivot 20 corresponding to the top dead centre position does not vary when the fixed point 21 is moved, but that its position corresponding to the bottom dead centre of the crank is at a distance corresponding to the angle A from the position of the pivot 20 wlfehthe fixed point ii remains unchanged.
  • the amplitude of oscillation of the rock arm 16 is therefore greater by the angle in the case of th e fixed point 21".
  • the pivot 26 describes an arc of a circle 36 and the pivot 14 a connecting loop 36.
  • the angular movement of the arm 16 can be varied without the crank radius 34 being changed.
  • This alteration of the position of the fixed point 21 can be effected during operation, that is to say while the parts are moving, since the fixed point 21 is at rest during this movement.
  • An alteration in the swivel angle in turn entails an alteration in the distance, by which the strip 9 is advanced into the press by the rollers 7 and 8 or drawn out of the press by the feed mechanism 38.
  • the base of the fourpoint linkage drive when the height of entry of the strip is varied it may be advantageous to adjust the base of the fourpoint linkage drive.
  • the adjustment of the base of the fourpoint linkage is particularly important when making a variation in the length of the feed motion, particularly when on the alteration of the stroke rate the length of the feed motion is unintentionally altered in consequence of the mass forces and the exact length of the feed corresponding to the tool must be readjusted by varying the position of the fixed point in the foui -pointli'nka'ge i w lclaim:
  • a press machine having a press tool and a feed mechanism for the step-by-step feeding of material to the press tool, wherein the length of the step-by-step feeding is adjustable, said feed mechanism including a drive shaft for being oscillated in a toand fro-manner so as to effect a selected angle of rotation, a crank drive operatively connected with the main shaft of the press machine, a four-point linkage for transmitting motion from said crank drive to said drive shaft, a connecting rod operatively connecting said four-point linkage and said crank drive, said four-point linkage including two fixed points, one of said two fixed points being selectively adjustable connecting rod.
  • a press machine as claimed in claim 1 in which the fixed end of the third lever is pivotally mounted on an angularly adjustable member and means for adjusting the angular position of said member in order to adjust the position of said third lever.
  • crank drive is so disposed that the path followed by the pivot connecting the first lever to the crank drive is elongated and ex tends in a direction corresponding approximately to the plane in which the feed mechanism is adjustable when adjusting the position at which the material enters the tool.
  • a press machine is claimed in claim 3 in which the pivotal axis of ,the second lever and the fixed position of the third lever are located on a base line that extends substantially parallel to the elongated path followed by the pivotal connection of the first lever with its crank drive.
  • a press machine as claimed in claim 1 comprising a third lever having a length which exceeds that of the second lever.
  • a press machine as claimed in claim 1 comprising a third lever having its point of connection to the first lever located on that side of a line passing through the pivotal connections of the first lever respectively with the third lever and the crank rdrive remotefrgm the fixed end of said lever.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
US3529542D 1967-06-15 1968-06-07 Feed apparatus for presses or the like Expired - Lifetime US3529542A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DESC040889 1967-06-15

Publications (1)

Publication Number Publication Date
US3529542A true US3529542A (en) 1970-09-22

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ID=7435921

Family Applications (1)

Application Number Title Priority Date Filing Date
US3529542D Expired - Lifetime US3529542A (en) 1967-06-15 1968-06-07 Feed apparatus for presses or the like

Country Status (3)

Country Link
US (1) US3529542A (enrdf_load_stackoverflow)
FR (1) FR1571545A (enrdf_load_stackoverflow)
GB (1) GB1224753A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3709050A (en) * 1969-08-21 1973-01-09 Cincinnati Milacron Inc Fine adjustment mechanism for stock feeding device
US3941240A (en) * 1973-02-21 1976-03-02 L. Schuler Gmbh Apparatus for operating automatic conveyors
US4292892A (en) * 1980-07-30 1981-10-06 William Combs Conveyor apparatus for press machines
US4333593A (en) * 1977-02-15 1982-06-08 Otto Bihler Feeder for feeding stock to machines or devices
US4350090A (en) * 1981-01-30 1982-09-21 The Minster Machine Company Motorized and micro feed length adjustment for a press feed

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3709050A (en) * 1969-08-21 1973-01-09 Cincinnati Milacron Inc Fine adjustment mechanism for stock feeding device
US3941240A (en) * 1973-02-21 1976-03-02 L. Schuler Gmbh Apparatus for operating automatic conveyors
US4333593A (en) * 1977-02-15 1982-06-08 Otto Bihler Feeder for feeding stock to machines or devices
US4292892A (en) * 1980-07-30 1981-10-06 William Combs Conveyor apparatus for press machines
US4350090A (en) * 1981-01-30 1982-09-21 The Minster Machine Company Motorized and micro feed length adjustment for a press feed

Also Published As

Publication number Publication date
GB1224753A (en) 1971-03-10
FR1571545A (enrdf_load_stackoverflow) 1969-06-20
DE1602569B2 (de) 1973-02-08
DE1602569A1 (de) 1970-04-09

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