US1740844A - High-speed feed for sheet metal - Google Patents

Description

Dec, 24, 1929. R. w. sTRo'uT H IGH- srmm FEED Fon-SHEET ure'nu.Y

Filed ay; 19. 1928 3 Sheets-Sheet l INVENTOR By Attorneys,

amm, MM www@ Dec. 24, 1929.

R. w. sTRouT 1,740,844 HIGH SPEED FEED FOR 'SHEET METAL 4 Filed May 19. 1928 5 Sheets-Sheet 2 By Attorneys, @W1/wn WW y INVENTOR v Bec. 24, 1929.

R. w. sTRou'r 1,740,844

HIGH SPEED FEED FOR SHEET METALl Filed May 19, 1928 5 Sheets-Sheet 5 i: Fw

,5 u o i J7 ILL, yf i mi "fu w g g IUI/)ULL(IH/[Nimm 1mg nmlnmm/vx By Attorneys,

4Q mechanism Patented Dec. 24, 1929 UNITED STATES PATENT OFFICE ROBERT W. sTRoU'r, oEBRooKLYN, NEW YORK, AssIeNoE 'ro E. W. ELIss COMPANY,

; oEBRooKLYN, NEW YORK, A coEroR'A'rroN or DELAWARE HIGH-SPEED FEED EOE SHEET METAL Application led May 19,

' punching presses or other machinery acting intermittently upon the fed sheets or strips. It `relatesto` roller Vfeeds or those in rwhich the strip is gripped between feed rollers which are rotated step by step to intermittentlyfeed the sheet in the intervals between the punching or other strokes of the press or other machinelfFor high speed intermittent feeding it is necessary to overcome the effect of momentum whichtends to carry the feed rolls too far; and for this purpose it is common to apply someform of brake, usually a band or strap brake', upon a hub on one or each of the feed roll shafts. v The .present invention yprovides -an improvedconstruction 'of diskbrake especially applicable for such purposes. A f v Figure 1 of the accompanying drawings shows in front elevation a portion of a punchthe feed rolls, the parts ing'press to which the feed mechanism of the present invention is applied.

Fig. 2is a vertical section on the line 2 -2 in Fig. 1 and on a much larger scale. Y

Fig. 3 is a section on the plane ofthe line 3 3 of one of the roll shafts.

Fig. 4 is aview in the same plane of one of the revolvingdisks of the disk brake.

tionary disks thereof. l

Fig. 6 is a diagrammatic view, showing the means fonimparting intermittent rotation to shown being viewed from the left in Fig. 1.

. Fig; 7 is a lplan of .the lower` part of the' I- mechanism `shownin-Fig. 6 partly in section in the plane of theline T-Tin Fig. 6.

Fig..8 is a Vsectional view of the ratchet onA a larger scale than Figs.. 6

and7.

. l Referring-to Fig. 1, the pres is shown as having a base A and side frames B Bcarryy 45 'ing a main shaft C which has an eccentric (or crank) for reciprocating the punchcarrying slide D which is driven from the .shaft through a connectingrod E in any usual manner. .The p ess shownV may be taken as typical of a punching press or other Ina-'- -by means of intermes tion in Fig. 2, which Fig." 5 is a similar view of one ofthe stal comprise end diSkS 7.7',

, shown in" dotted lines atthe left in Fig. 1, and A in fragmentary side elevation in Fig. 2.y The journals g g of these roll shafts are carried in bearings k la. conveniently constructed as bearing blocks suitably held in recesses 'in the'frame F in any customary manner and pressed together in any suitable Way'for giving the feed rollers the necessary grip .upon the sheet or.` strip of metal being fed. The rollers are geared to ether to turn in unison ing gears z' i', shown in dotted lines at the right in Fig. 1 and in secgears are keyed to the shafts in the usual. way. To the frame F is bolted a frame H which is hollow and serves as a housing for'the gears z' z" andalso serves as a base support for the friction brake which as a whole is'lettered J.

The friction brake is constructed in eneral Aafter the customary construction of ictionl brakes in-that it has alternating stationary and revolving disks. The stationary disks between which all the other disks are confined, and intervening disks j the disks j j are alike except that the outer disks-are thicker; Fig. 5 shows the contour of these disks. The rotaryfdisks shown in Fig. 6 are lettered lo k -and are alternated betwx-'en-the stationary disks. Between' the successive stationary and rotary disks are facings Z Z of any suitable frictional material,

such as asbestos fabric commonly applied as holes m m (Fig. 5) which have a free or sliding iit `with pins vor bolts p p which are screwed xedly into the plate H and serve for holding the stationary disks in their non-rotative position. For pressing the disks yieldingly together springs s s are provided which are conveniently made as 'helical springs applied on the respective bolts p and tightened adjustably thereon by means of nuts g q. j

The rotary disks 7c have an essentially splined engagement with the shaft of one of the feedrollers this is best accomplished by forming the end portion of the shaft with grooves 1, shown in Figs. 2 and 3, and making the disks 7c with a central opening having inward projections twhich.' make a loose 01 free lit with the grooves r, thus forming a multiple key-way or splined connection whereby the torque is uniformly distributed. The rotary disks are preferably circular, and turn within the stationary pins p p.

' The entire feed mechanism ,carried bythe frame F is adjustable up or down withI respect to the framing of thepress or other machine in order to bring the fed strip of metalv tened in such position by tightening the nuts von the bolts b b. adjustment of these frames the base A is-,provided with adjusting yscrews e e passing through lugs cast on the base and engaging the under side of the respective frames F.v 'The frame F is conveniently constructed with Y `an outer section or cap F (Fig. 1) by re moving which the bearing blocks L h are rendered accessible and they feed rolls may be 'taken out, these caps are held by any convenient fastening, such ,asbolts b at the bottom and tap screws or bolts f at the top. At the left in Fig. 1 the frame F is modified toserve also asthe slideway for a slide L, which in the press, shown carries a shear blade vfor chopping up the scrap left after thepunchings haye-been-cut'from it.

The intermittent feed movements are imparted to the feed rollers G G in any suitable Way, as for example by any known ratchet mechanism. vThe mechanism for this purpose adopted in 'the particular machine illustrated is bestshown 'in Figs. 6, 7 and 8. The

shaft K is driven in unison with the main shaft C, as for example by intermeshing gears of like pitch u 'v w, and the shaft K carries an adjustable-throw cranka; which drives av rack bar g/ having sliding movement (in a rockerguide z oscillating freely on a shaft 10. The rack bar jz/ has a rack of gear teeth 11 meshing with external gear teeth on a drum 12 which oscillates freely around the To facilitate the vertical'` `shaft 10. Thus the reciprocation imparted to notches, lwhich rollers are'. pressed out byv spring plungers 15to force them into wedging frictional engagement between the tangential faces of the notches and the inner facev of the drum, so that on the forward stroke of the drum they lock and on the rearward stroke they are released and roll back idly againsttlie radial faces of the notches.

The lshaft 10, which is thus driven intermitin Fig. 7.

The described feed mechanism operates by the simultaneous rotation ofthe two pairs of feed rollers so as to feed the sheet or strip of metal equally and d in the same direction at oppositesides of the machine. The feeding 'justing nuts Q Q', remains constant notwith! Astanding the slight wear whichl incourse 0f. time occurs upon the surfaces -of the respec" movements are preferably performed on the return movement 'of the punch slide, the downward movement while the punch is entering the metal being utilized for the return -ing effect without imposing any unnecessary drag upon the machine. This adjustment, being once accpmplished by adjusting the stress ofthe springs s 8 bymeans of the adtive stationary androtary disks of the brake and their intervening facing fabrics. In its application to such presses the disk brake thus provided has a great advantage over the band brakes heretofore generally used which are subject to such .wear that they 'soon get out of adjustment,.and which are .irregular in their action, being liableto be adjusted too tightly and quickly .wearing or vpolishtently, drives theshafts g g of the rollers G` v G through miter gears 16'-17, as best shown` ing their braking surfaces so that the rei In Aconnection with this frictional ratchet type of feed motion the improved disk brake already described has the advantage of imiparting to the rolls G G, shaft and ratchet disk'l such resistance to backward motion Vas" to insure the positive unlocking o'f the ratchet rollers at the beginning of the backward rotation of the drum 12. Y Fig. 1 shows '.tion to the present invention.

slide D has tappe't screws 20 which on the dotted lines, and a stop arm 24. T he lifting an accessory of a roller feed of the character described which has, no necessary rela?` The punch down stroke of theslide strike tappet levers 21 projecting fromrock shafts 22, each of which carries a lifting arm 23, rshown in my name.

arms take under the boxes of the upperl feed rolls G andlift these to separate the rolls and 'free the scrap Ashortly before the punch (or punches) enters the metal so as to enable the sheet metal to be brought to register punching or, other gauge openings in the strip of metal whereby to gauge the location of the punches more accurately than can be accomplished by an intermittent vfeed alone.

-The extent ofseparation of the rolls is de termined. by the abutment of the stop arm 24 against an eccentric v25 which is adj ustable to positions of varying throwZ by a rocker arm j 2.6. This mechanism (20I to 26) may be vas omitted in case the use of accurate gauging pins is -not required.

YThe construction illustrated is the preferable one, but may be varied Within the skill of mechanics' or' designers according to the desired location for the feed mechanism and i i the shaft of'a feed-rolhsuch br other local requirements.

-WhatIclaim is: 1. A high speed .feed mechanism for a' punching press or similar machine, compris-l :ing feedrolls, means for intermittently rotating them. and a disk `brake applied upon ake comprising alternating stationary and rotatable disks and adjustable yielding means for pressing them together, the.rotatable disks havingza nonrotative`connection with. the shaft of said roll.v

' 2. A feed mechanism according to claim 1,

having a frame carrying the bearings for the v -roll shafts and a face plate fastened theretoV for carrying thee friction brake, and a stationary mounting fastened thereto for the stationary' disks of the brake.

- 3, A feed mechanism accordinto claim 1, the stationary disks of the brake having re- -1 -cesses,` fixed studs. engaging-saidrecesses, a base plate for the brake to which said studs are attached, and ad]ust ing springs and nuts appliedto said studs.

4. A feed mechanism according to claim 1, the rotative. disks of the brake having a mulv tiple splined engagement with the roll shaft,

and the stationary disks of the brake engaged '6. A feed 'mechanism according to claim 1, 'with an adjustable frame carrying such feed mechanism mounted on the frame of such machine, and movable bodily to .vary the position' of the feedl rolls.

In wit-ness whereof, I have. hereunto signed ROBERT w. sTRoUT.

by' the use yof pins engaging the previous v

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