US1976357A - Machine for straightening, drawing, and polishing rods - Google Patents

Description

H. MOLLER Get. 9, 11934.

MACHINE FOR STRAIGHTENING, DRAWING, AND POLISHING RODS Filed May 16, 1931 4 Sheets-Sheet l H. MULLER 1,976,357

AND POLISHING RODS Oct. 9, 1934.

MACHINE FOR STRAIGHTENING, DRAWING,

Filed May 16, 1931 4 Sheets-Sheet 2 m m WWW/M H. MGLLER Oct. 9, 1934.

Filed May 16, 1931 4 Sheets-Sheet 3 H. MGLLER Oct 1934.

Filed ma 16, 1931 4 Sheets-Sheet 4 ill Patented on. 9,1934

UNITED STATES.

PATENT OFFICE] v mom son s'rnAIGn'rENmG, DRAWING,

AND POLISHING RODS Heinrich. Miiller, Ergste, near Schwerte, Germany, assignor to the firm Schumag Schumacher Metallwerke- Aktien-Gesellschaft fur v Pra'zisionsmechanik, Aachen, Germany 7 Application May 16, 1931, Serial Ida 537,91? In Germany May 16, 1930 4 Claims. (01. za-ss) This invention relates to a double acting and automatic machine for inserting, drawing, .straightening and polishing rods. e

A single acting automatic drawing machine is I known, in which, the wire isdrawn and cut to length by a cutting device arranged behind the drawing carriage. The rods are then automatically pushed forward singly through the cutting device by the following rods to a straightening l0 and polishing machine and are then deposited in a collecting vessel. The reciprocating movement is effected by a reversing gear with accelerated return motion.

A disadvantage of this construction is, that the II return movement of the drawing. carriage is ef-..

2 slightly bent or cut crooked, the two rods will F slide past one another and neither will hated to -the straightening and polishing machine.

; 1 It is also known to emove the rods singly from the deepest point of p ckling troughs with transversely inclined bottom surface by means of end less chains with grippers, to further treat these rods and feed same to the draw plate of the draw bench on a continuously moving conveyor. The pointed end of the rod projects through the draw 5 plate'and disengages the draw bench by vaspecial device. bench works with two drawing car-. riages operative alternately inthe working position and which, duringthe working operation, are

coupled with a continually circulating endless.

drawing chain, whereas the drawing carriage, which is not working, is returned to its initial position on a side path. The finished drawn rod drops on to the drawing chain and is moved on thereby and fed by another conveyor; to shears, which cut off the pointed end. A further conveyor serves for depositing the finished drawn material into receptacles. No means for polishing and straightening of the drawn material are pro- 5ovided.-.- v

This machine is open to the objection .that the drawing carriage, which is notoperative, is brought back to its initial position in a complicated manner outside the working path.

Further, by/the throwing off of the already 'drawn rods on to the drawing chain, the chains may be damaged.

The return movement of the drawing carriage may be effected rapidly, independent of the gearing. Finally, the output of the machine is increased by the provision of two drawing tongs on the drawing carriage.

An embodiment of the invention is illustrated by way of example in the accompanying drawings in which: u Figs. 1 and 1a show the machine in side eleva- Fig. 2 is a section through the feeding device on line 2-2 of Fig. 3.-

Figs. 3 and 31: show the machine in top plan 7 view.

The feeding device A is arranged front of the drawing bench B proper. Two U-girders 22, fixed at their ends in the frame-oi the drawbench B and on fiat bars 23 (Fig. 2) whichform the frame. The rods to be drawn lie flat on inclined bars a fixed to the frame and resting on a bar 24 (Fig.3) mounted onthe uprights 25 (Fig. 2). In order-to prevent the rods from lying trans-' versely one above the other, they are held by flat bars 12. The disc-shaped catches 0 take the rods singly out of the pairs of flat bars a and b by means of fingers d and place them on a circulating band I. The speed of rotation of the catch 0 is so regulated that one revolution corresponds to one reciprocating movement of the drawing carriage s, which is obtained in that the drive of the catch shaft 26 is effected indirectly by the draw chain it which drives the toothed wheel 40. The endless band I is driven by a shaft 27.with discs 28 keyed thereon and it runs over rollers 29 in a trough e. Catches a are fixed on the bands I.

The double draw bench B connected to the feeding device A rests with its U-girder frame 33 on two cast iron columns 31 and 32. Wheels r and q of the drawing carriage s run between two flat bars fixed on the webs of the U-girders 33. Two draw tongs p are fixed on the plate of the drawing carriage and can only open until the arms 3 ofthetongs strike against an abutment 8. Two slots]. are provided symmetrically hi the plate, and catches t, rigidly connected to the drawing chain it and shifting the drawing carriage, engage in these slots. 'Further, a-fiat bar 19 is fixed on the plate,-which throws over a lever 20 of a switch 21 and stops the driving motor, when the drawing carriage has travelled beyond its extreme position. The angle irons 17 on the plate strike then against the stops 15 and move the slide 16 through the intermediary of the commencement of the drawing are guided by.

a funnel-shaped extension 30 into a draw plate a mounted in a holder 22, the pointed ends of the rods projecting so far from the funnel-shaped extensions that they can be gripped by the drawing tongs.

The following parts are mounted on the frame 33; two springs 18, a resilient device 2, which will be hereinafter described, for tensioning the tongs, resilient abutments 4 for opening the tongs p, the

switch 21 and the trough 5, into which the drawn rods drop. One column 32 of the draw bench stands on a foundation plate 35 with a driving motor 36 and its gearing 37, and also two straightening machines, which are driven by two like motors 38. The finished rods are ejected through the tubes 39 into a collecting receptacle.

The machine operates in the following manner:

The rods to be drawn and already pointed are placed fiat,on the inclined guide bars a on each side of the draw bench b. The disc-shaped catch c with finger d removes the rods singly from the feeding frame and places them in the feed groove 6 for the endless band on which the catches g are fixed which feed the rods through the funnels 30 into the draw plates 2. The drive of the catch 0 is effected by a worm gearing it through the intermediary of belts i and shaft is, which also drives the endless band 1 through the intermediary of a belt Z and is itself driven by a drawing chain u through the intermediary of the toothed wheel '40 with shaft to and chain n. The drawing carriage s, equipped with two drawing tongs p and guided laterally and also on the top and on the bottom on rollers q and 1', is coupled to the draw bench chain 11, during the drawing by two catches t which engage in the slots 1 fromunder the carriage plate.

This operation takes place in the following manner. During the rotation of the draw chain u, which is always in the same direction, the catches t on and rigidly connected to the draw chain it, describe an arc in passing from the lower bight of the chain when being guided over the sprocket wheel and extend vertically upwards like two fingers, which here'engage slots 1 in the plate of thedraw carriage s and transport the same. At the end of the draw pass, that is when the catches are again conveyed on to the lower bight of the draw chain, the fingers swing out of the slots 1 of the plate of the draw carriage s.

For the purpose of supporting the catches andof preventingthe sagging of the upper bight of the draw chain u, single guide bars 43 are provided on both sides thereof which engage laterally the upper bight of the chain and on which the lower surfaces on the catches t bear. After the drawing the weight loaded chain 10 moves the drawing carriage s in front of the draw plate holder 1), in front of which two flat springs 34 are arranged as buffers. These tongs 1) each comprise two intersecting levers p which are hingedly connected at their point of intersection by an axle 42, each lever carrying a jaw 12 at one end. One of these levers p is hingedly connected at its other end to an arm 3 pivotally mounted intermediate of its-length on a pivot pin 42a fixed on carriage s, the other end of the second lever being hingedly connected to this pivot pin 42a by means of a link 12 At the end of the return movement of the carriage resilient toes 41 (Fig. 1) bear against the axles 42 of the tongs thus forcing these axles towards the pivot pin 42a and spreading the levers 12 thus opening the jaws p of the tongs to their full extent. The toes 41 then yield and slide over the axles 42. The carriage s is then connected with the drawing chain u by the catch t and commences its drawing movement whereupon these toes 41 engage behind the axles 42 and pull the same away from the pins 42a thus causing the jaws p to close and grip the pointed rods projecting from the draw plates 2. These toes 41 then againyield and slide over the axles 42. The tongs are prevented from opening too far by the free ends of the arms 3 coming into contact with the abutments 8. 'These tongs p are described in de-. tail in German Patent 450,331.

After the rods have been drawn, the arms 3 of the tongs strike against the resilient stops 4 and open the tongs'p, the abutments 8 fitted on the carriage, preventing thetongs from opening wide. The drawn rods, drop by gravity into the troughs 5, arranged one on each side of the machine. In this extreme position the swing out catches t, which are no longer held on the slide-path 43 (Fig. 3), disengage automatically from the drawing carriage s and continue to move on with the chain u. The drawing carriage s is returned into its initial position by the weight shifting in a tube, with the chain 10, running over rollers 11 and 12, after which the working operation commences afresh.

During the fresh operation the rods, already drawn during the preceding operation and lying inthe troughs 5, are at the same time pushed into the straightening and polishing machine C through the funnel 6 and guide tube '7, by means of the oscillatable catches 13 arranged under the drawing carriage s, and then drop into the collecting receptacle. In order to enable these rods to be always reliably gripped by the catches 13, as'pecial arrangement is provided. On both sides of the draw bench B rods 14 are arranged longitudinally shiftable in rigid bearings on the outer vertical flanges of the U-shaped troughs 5. On one end, namely that adjacent the straightening and polishing machine C the rods 14 are provided with an abutment or finger 15 extending upwards at right angles. On the other ends the rods carry a slide 16 likewise bent at right angles but extending horizontally, which slide rests with its under surface on the bottom of the trough. The drawn rods do not drop vertically into the troughs but, owing to theirkinetic energy, move slightly forwards so that they come to lie with their end in front of the slides 16.

The slides 16 lie as near as possible to the draw bench so that the drawn rods do not fall onto the slide but in front of same.

Shortly before the draw carriage reaches its extreme position which it assumes slightly later than, that is after, the opening of the tongs p, the abutment 17 projecting vertically downwards from the under side of the draw carriage comes into contact with the finger 15 of the rod 14 and transports the same. The rod 14 is therefore shifted in the drawing direction with the slide 16, the drawn rods being shifted ona short distance in the trough 5. During the next drawing operation of the draw carriage the rods drawn in the previous pass and lying in the trough 5 in the manner above explained are gripped icy the catches 13 oi the draw carriage and pulled in the direction or the polishing machine C.

In order to prevent the catch 13 from engaging the drawn rods and pushing them backwards in the trough 5 during the return movement of the carriage the catch 13 is arranged to swing up in the direction of the arrow shown in i. As thiscatch cannot however swing up in the oppo= site direction it will drop and engage behind the rods and push them along the trough 5 into the polishing machine C during the outward movement of the carriage away from the die head. The spring is pulls the rod l with the slide is and finger l5 hack into the initial position. In the event of the drawing carriage running heyohd extreme position, the fiat bar ill strikes agalhst the lever 2c of the switch 21 and cuts out the driving motor. After leaving the straightening and polishing machine the finished rods drop automatically into the collecting receptacle.

I claim:

1. An automatic machine for drawing straightening, and polishing rods, comprising in combl= nation a double draw bench having two draw plates, feeding devices arranged one at each side of said draw bench adapted to feed the rods to be drawn to said draw plates, two drawing tongs adapted to grip the pointed ends of the rods projecting from said draw plate, a draw carriage carrying said two drawing tongs, means for clos-= ing and opening said tongs in dependency upon the forward and backward movements of said carriage, an endless drawing chain adapted to move forward said carriage at regular intervals, a weight adapted to return said carriage into its initial position along its working path after the drawing operation and disengagement of said drawing chain, troughs arranged one on each side of said drawing chain into which the rods drop after drawing, a straightening and polishing ma.- chine at the end of each of said troughs, and means for feeding the rods which have dropped into said troughs to said straightening and polishing machines actuated by said drawing carriage moved forward during the next drawing operation.

2. A machine as specified in claim 1, comprising in combination with the draw bench, two storage frames arranged one on each side in front of said draw bench, and catches with fingers arranged above said frames adapted to remove the rods singly from said storage frames.

asst 3' "2 in a machine for straightening and polishing rods, for feeding the rods as spechled in claim 1, comprising in combination with the draw beach the carriage, the troughs, and the means for feeding the rods, said means comprising two slides arranged one at each side of said carriage in said troughs adapted to push toward the rode a certain distance after the drawing, two rod systems each composed of a rod with a finger extehdihg one along each side of said draw loehch and carrying one or said slides, an abutment on each side oi said carriage adapt-ed to control said slides through the intermedian; of said rod system, and oscillatable catches on said carriage adapted to reliably grip arid feed on the rods pushed forward by said slides.

4. In an automatic machine for drawing, strai htening and polishin rods, the combine, tion of a double draw hench, draw plates at one end or said bench, a carriage on said bench, means for moving said carriage backwards and torwards along said draw loehch, tongs mounted on said carriage and each including a pair of jaws, a pair oi intersecting levers each carrying one of said jaws, an aide hingedly connecting said pair of lovers, a pivot pin in said carriage, an arm mounted intermediate of its length on said pin and connected at one end to one of said levers, and a link connecting the other of said levers to said pivot pin, two resilient abutments one for each of said tongs at the other end of said bench each adapted to loear against the free end of said arm to open said tongs at the end of the drawing movement of the carriage, resilient toes arranged at the end of said bench adjacent said draw plates said toes adapted to bear against said axles of said tongs to fully open said tongs and to slide over said axles at the end of the return movement of said carriage and to engage loehind said axles to close said tongs at the commencement of the drawing movement of said carriage and to finally again slip over and release said axles during the further drawing movement of the carriage, and two abutments on said carriage one for each of said tongs adapted to bear against the free end of said arm and limit the opening movement of said tongs.

HEINR. Mouton.

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