US3548997A - Live roller feed table with ejecting means - Google Patents

Description

United States Patent Inventor Otto Karl Buchheit 2 Eulentalstn, 667 St. lngbert-Saar, Germany Appl. No. 762,944 Filed Sept. 26, 1968 Patented Dec. 22, 1970 Priority Sept. 30, 1967 Germany No. 1,602,217

LIVE ROLLER FEED TABLE WITH EJECTING MEANS 4 Claims, 3 Drawing Figs.

198/127: 214/1 1111. C1. ..B65g 39/00, 865g 47/52 Field of Search 198/24, 127, l88;2l4/1P2; 74/109 [56] References Cited UNITED STATES PATENTS 2,057,131 10/1936 Barton et a1. 198/24X 3,245,271 4/1966 Roberts 74/109 3,430,749 3/1969 Ferrari 198/24 Primary ExaminerRobert G. Sheridan Attorney-John J. Dennemeyer I ll 11 I ll enawmvamae I II M I I LIVE ROLLER FEED TABLE WITH EJEC'IING MEANS The invention concerns a live roller feed table with a device for periodically ejecting continuously fed rolled elongate material, such as rolled bars and rods. This live roller feed table can be used in connection with a cooling bed as well as a cooling pit. I V

The usual device for periodically ejecting rolled elongate material "consisting of base plates adapted 'to be raised or lowered, so-called brake slides, cannot beused when operat ing with high rolling speeds and extremely short bar lengths, thus a shorter bar sequence, due to extremely high switching frequencies and relatively high inertia forces which result in excessively high acceleration values; "Accordingly the invention consists of a live roller feed table with ejectors that are movable transversely to the feeding direction, such as straight edges or spaced wipers pivoting around vertical shafts. Similar to the known base plates that are raised and lowered, the ejectors are connected to a common linkage mechanism which, through .a fast switching reversible positioning drive having a linearly moving positioning link, is able to impart a longitudinal back and forth motion to these ejectors.

It will be understood that the reversible positioning drive with linearly movable positioning link could be, forexample, a hydraulic or electromagnetic servomotor. However, even with these reversible positioning drives, extreme feed conditions rod is connected to the linkage mechanism and rotates in one working cycle the crank gear through 36 360. Thus the link age mechanism will be moved forward-and back again through one cycle of the positioning drive. Appropriately, thefull revolution of the crank starts from a deadcenter position of the crank gear as this is best adapted to the acceleration conditions resulting from the sinusoidal displacement of the linkage mechanism. It is particularly" advantageous to use a reciprocatingpiston-rotary drive as positioning drive whose rack stroke matches the pitch circumference of the pinion driving the crank. As positioning drive one could also consider a normal hydraulic motor with a double acting piston or an electromagnetic drive, and in both cases the piston or adjusting rod should incorporate a rack. It is pointed out that double-arm rotating wipers for live roller feed tables are known. They are mounted in front of the live roller feed table on a drive shaft extending parallel thereto. The drive shaft with the ejectors must be rotated by l80for every ejection and this must be clone without changing the direction of rotation. For this operation one requires either an expensive motor for an extremely high switching frequency with'a brake installation to maintain the lS0-rotation, or a continuous speed motor with a magnetic particle clutch whose switching frequency is nevertheless also restricted since two switching operations are needed for each working cycle, namely start and stop. The live roller feed table, according to this invention, is not subject to these restrictions because only one start command is required and the motion of the linkage mechanism is positively stopped at the end of the stroke. A reversing is merely required from one bar to the next.

The features and advantages of the invention will further appear from the following description made in reference to the accompanying drawings showing an embodiment of a live roller feed table. In the drawing:

H6. 1 is a plan view of the entire live roller feed table;

FIG. 2 is an enlarged plan view according to FIG. 1 with a sectional view of a reciprocating piston-rotary drive; and

FIG 3 is a cross section of the'live roller feed table with an adjacent cooling pit.

The live roller feed table located behind rotary shears 10 consists of fixed base plates 11 between which protrude sloping rollers 12 of the roller track. The feeding channel thus pro vided is limited along one side by vertical partition walls Ila between which are mounted on vertical shafts l4 wipers l3 pivoted transversely to the feeding direction; In their fully ex tended position shown in FIG. 2 the wipers l3 supplement the vertical partition walls to constitute a continuous lateral limit of the feed channel.

The ejectors l3 consist of double-arm levers with lever arms which are interconnected by a common linkage mechanism 15. When the linkage 15 is axially displaced the wipers 13 move into the dotted line position 13' and the levers 13a move into the dotted line position 13a. Due to this motion a bar travelling on the fixed base plates will be ejected laterally, reaches an angularly adjustable slide plate 17, and as shown in the embodiment illustrated it slides from there into a cooling pit 18 (FIG. 3). A straightening plate system of a cooling rake bed can be connected laterally'to the live roller feed table instead of the slide plate 17. The bed of the cooling rake can also be mounted laterally to the adjustable slide plate 17 because its slope can be set in such a way that after passing over the slide plates 17 the bars come to a rest at its left extremity.

The invention is directed to the positioning drive for the linkage mechanism 15. This positioning drive consists of a reciprocating piston-rotary drive 20 having a rack piston 21 which is adjustable forward and backward and which meshes with a pinion 22. The stroke of the rack piston 21 matches the pitch circumference of the pinion 22 so that it rotates through a complete revolution when the rack piston 21 moves from one end position to the other end position.

A crank arm 24 with a crankpin 25 is mounted on the pinion shaft 23. A linkage rod 26 connects the crank pin to the linkage joint 27 of a first lever arm 13a from-which the linkage mechanism 15 begins. This linkage mechanism will be actuated back and forth during one working cycle of the reciprocating piston-rotary drive 20 whereby all the ejectors 13 will move into position 13' and back again, because the crank pin 25 makes one complete revolution during each forward stroke of the rack piston 21. In the illustrated end position of the ejectors 13 the crank pin 25 is located in a dead center position.

Iclaim:

I. An elongate material ejection device for a live roller feed table of the type having base plates and rollers for advancing said elongate material along said base plates in a feeding direction comprising, in combination, a plurality of pivotally mounted ejectors supported adjacent said base plates in longitudinally spaced relationship for pivotal movement transversely to said feeding direction to eject said advancing elongate material from said base plates, a linkage mechanism connected to ejectors for simultaneous movement of all said ejectors, reversible, positioning drive means connected to said linkage mechanism, said drive means being movable in one direction to move said linkage mechanism reciprocally for said pivotal movement of said ejectors back and forth transversely to said feeding direction for ejection of said elongate material from said base plates, said drive-means being movable in the other, reverse direction to similarly reciprocate said linkage mechanism for said pivotal movement of said ejectors back and forth for ejection of said advancing elongate material from said base plates. j

2. An ejection device in accordance with claim I, wherein said drive means includes a rotatable crank, means for connecting said crank to said linkage mechanism, and reversible means for rotating said crank, said crank rotating means being arranged to rotate said crank for one revolution in each of said directions for said back and forth movements of said ejectors.

3. An ejection device in accordance with claim 2 wherein said reversible means includes a piston arranged for reciprocating movement and means for drivably connecting said piston to said crank.

4. An ejection device in accordance with claim 3 wherein said means for drivably connecting said piston to said crank includes a pinion gear mounted on said crank, a rack mounted on said piston for meshing engagement with said pinion gear, said piston having a stroke for one complete revolution of said UNI'IEI) S'IA'IES lA'll'lN'l ()FFHII". CERTIFICATE OF CORRECTION December 22, 1970 Patent No. 3 n 548 997 Dated Inventor(s) Otto Karl he 1t It is certified that error appears in the above-identified patent and that said Letters Patent: are hereby corrected as shown below:

On the cover sheet insert [73] Assignee: Moeller G Neumann G.m.b.H. Ingbertl Saar,

Germany Signed and sealed this 1st day of October 1974.

(SEAL) Attest:

McCOY M. GIBSON JR. C. MARSHALL DANN Attesting Officer Commissioner of Pat:

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