US1592812A - Can-end-folding machine - Google Patents

Description

R. Ronan CAN BND FOLDING CHINE F11-ed Dec. 24, 1925 Patented'July 13, 1926.

UNITED STATES PATENT OFFICE.l

RICHARD RODER, 0F ZEULENROD A/THURINGE, GERMANY, ASSIGNOR TO CARL KNEUSEL, 0F -ZEULENROD A/THURINGEN, GERMANY.

CAN-END-FOLDING MACHINE.

Application led December 24, 1925,Seria1 No. 77,636,V and in Germany October 20, 1924.

The object of the present invention is a. driving gear for a folding tool for closing machines, lwhich are used for closing noncircular cans.

The essential feature of the novel device consists in that the `positive` motion of the guiding rollers `with their` supports produced during the workingprocess by the rolling or devolving action ofthe noncircular can is usednfor performing the workV of folding and that by this positive motion of .the guiding rollers and its supports a feeding vmotion is imparted to the throwing or liftin curve, said feeding motion being adjustab e by means of a stop. f

Through this condition or operation the automatic rfeedinggrnotion of the folding rollers for forming the fold is produced di? `rectly at the supports of the folding. and

guiding-rollers, the hitherto necessary driving members ofthe folding-.levers operated by the driving shaft through the machine are being obviated, and an adjustment to a greater or smaller number of can revolutions for one single working operation is made possible and a more simple and easier work` ing is Ohta-ined.

In the drawing one formv of embodiment of a folding machine according to the two-- Ylever system (first-fand final or finishing roller) is shown. 7

In the drawing- Fig. l is a side elevation of a complete machine,

Fig. 2 is a side view of the arrangementY of the tools,

Fig. 3 is a ground-plan of a disposition of the tools with fo1ding-roller-lever in the initial position previous to placing a can into'the machine. f

Fig. 4 is a side-view of the tool-disposition with folding-roller-lever in .initial position prior to putting in a can.

Fig. is a plan-view of a tool-arrangement with folding-roller-lever in advanced position after several revolutions of spindle during operation;

In these drawings a denotes a friction coupling operated by the foot-pedal c and forming a coupling-connection between the driving pulley and the working-spindle of the machine, which connection ispreserved also in case the foot-pedal is let go,

by means of a lever lw in the well-known manner, said lever fw being provided with a notch for the purpose. b and c are the two bottom disks, between'which the can to be folded is placed and held; d is the guiding cam corresponding to the noncircular shape of the can and rigidly connected to the upper bottoni-disk; e denotes the guide-roller-` lever arranged to oscillate on a pivot-pin f, which is provided at the body of the machine. Said lever e carries at one end the guiding roller g which is positively guided in a slot in the guiding-cam cl, and which slot conforms to the shape of the cam. The foldingroller-lever i is carried by the guiding-roller-lever c and is mounted on a pvot L. At the other end of the lever e a pawl-lever k is provided and is pivoted at m, and provided with a pawl Z. The foldingrollerlever i hereinbefore mentioned carries at one end the folding roller n and atthe other end a carrying roller 0, which bears against a lifting-cam p. This lifting f Y rever, connected with the guiding roller lever e bymeans of a key-brake r so that when the guiding roller lever e 1s osclllating around the pivoting pin f in a direction away from the working-spindle of the machine, the lifting cam-19 and the ratchet-wheel g are caused to revolve around f, as they are taken along by the key-brake r. They do not, therefore, change their position in regard to the guiding roller. lever e, but at an oscillating movement of the guide roller lever e in the op posite direction the ratchet-lever c will strike against the adjustable stop 8 fixed to the body of the'machine turn on its pivot arm, and cause the pawl Z to move the ratchet-wheel g, and hence also the.` lifting cam p through a rotary movement around the pin 7" accelerated in relation to the guide roller lever e, and change the position of said cam in yrelation to the guide roller lever e. As a result, the carrying roller` o of the folding roller lever z' oscillating with the guide roller lever e will rise, to af higher point of the rising branch of the lifting cam lill) be increased and the folding roller n will approach the bottom disk Z) as a` consequence of the double-arm ratio of leverage'at the folding roller lever i. This train of movements repeats itself at every1 oscillating movement of the guide roller lever e caused by the revolution of the guiding cam CZ, and in this the above mentioned ratchet wheel g with the pawl Z, and assisted by the keybrake r will operate in the manner of a ratchet, and will causel the lifting cam p to revolve around its axle f intermittently. Hence the folding roller n will gradually approach the bottom disk and if a can has been put in place, will perform the folding work. As soon as this is finished,i. e if the carrying roller 0 has passed the highest point of the lifting cam, the carrying roller will run valong the declining branch of the cam by action of the tension spring t, and the folding roller n will move away from the bottom disk.V A stopping-pin u is'provided on the lifting cam p, which will throw out of action, by means of the angle-lever o and lever w, the friction coupling a and thereby will stop the machine. The said stop s is adjustable so as to-produce, by acting sooner or later on the ratchet-lever 7c, a greater or less advance of the ratchet-pawl Z, a more rapid orslower turning of the lifting cam p and, consequently a longer or shorter duration of the folding operation, and hence make adjustable to different numbers of full turns the can-revolution speed per one folding operation. y

The same train of operations and movements, as above described for the first or preparing folding roller, 'occurs in a similar way in the case of the finishing folding roller, in which case, however, the folding operations of both rollers occurs in the corresponding sequence during one revolution of the lifting cams only.

Y In the same manner this mode of driving may be used also with folding machines with slides or supports or carriages serving as folding roller carriers in contra-distinction to the example given here and relating toa machine with levers as folding-rollercarriers, or machines with rotating folding tools and stationary guiding cam and can.

The operation is as follows:

The can to be folded is placed on the lower bottom disk c. By depressing the foot-lever c the can together with the lower bottom disk c is lifted and jammed tight between the upper and lower bottom disks o and c; at the same time the friction coupling a is made to operate and the working spindle of the machine and withr it the guiding cam d andthe can to be folded' are thereby made to rotate. `I-Iereby the oscillating movements of the folding roller lever e are started and consequent upon this,.by means of the ratch- 'et lever lo with pawl VZand stopk 8 as described above, the intermittent rotary movement of the lifting cam 7) and consequently the folding operations of the folding roller n. As soon as the lifting cam o has described complete revolution around its axle f, the stop-pin laffixed to it will strike the angle lever v@ Hereby the latter is moved around its pivoting point z, the lever fw is lifted from out ofthe locking position, the notch having caught on throwing the machine into operation, and now.- the friction coupling a is released and the machine stopped. At the same time the foot-pedal, which had remained in its 'depressed position during work, goes back into its raised initial position of rest, and the lower bottom disk c lowers down with the folded can into its initial position.

I claim:

l. In a can end folding machine, in combination with bottom discs and non-circular guiding cam fast to one of the discs, a guide roller lever pivotally mounted at a point intermediate its ends and provided withv a guiding roller which is guided by said cam. a pawl operating lever pivotally mounted at a point intermediate its ends at the other end of the guide roller lever, said pawl ops erating lever being provided at its inner end with a pawl, a stop element arranged in the path of movement of the outward end ot' said pawl operating lever, a folding roller Ylever pivotally mountedat a point intermediate its ends on said guide roller lever and provided at its outer end with a folding roller and at its inner end with a carrying roller, a spring active to move the guide roller end of said guide roller lever outwardly, a lifting cam mount-ed on the pivot of the guide roller lever and against which said carrying roller of said folding roller lever bears, and a ratchet wheel fixed to said lifting cam and engaged by said pawl for partial rotation of said lifting cam and said ratchet wheel when said pawl operating lever engages said stop.

2. In a can end folding machine, in combination with bottom discs and non-circular guiding cam fast to one of the discs. a guide roller lever pivotally rmounted at a point intermediate its ends and provided with a guiding roller which'is guided by said cam, a pawl operating lever pivotally mounted at a point intermediate its ends at the other end of the guide roller lever, said pawl operating lever being provided at its inner end with a pawl, a stop element arranged in the path of movement of the, outward end of said pawl operating lever, a folding roller lever pivotallj,7 mounted at a point intermediate its ends on said guide roller lever and provided at its outer end with a lfolding roller and at its inner end with a carrying roller, a spring active to move the guide roller end of said guide roll- B tl DGI

er lever` outwardly, .a lifting cani mounted said pawl operating level` engages said stop, on the pivot of the guide roller level1V and the said stop being adjustable to vary the against which said carrying roller of said extent of movement of saidpavvl operating l0 folding roller lever bears, and a ratchet lever. Wheel fixed to said lifting Cain and engaged In testimony whereof I aflixed my signaby said paw] for partial rotation of said ture.

lifting vCain and said ratchet Wheel when RICHARD RODER.

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