US1593607A - Can-shaping machine - Google Patents

Description

. Jill '27, 1926.

1,593,607 6. T. SMALL CAN smmue momma 7 Filed Jan. '19. 1923 2 Sheets-Sheet 1.

INVENTOR C. T($MALL ATTORNEY guiy 27 1926.

, 1,593,607 C. T. $MALL CAN SHAPING MACHINE 1EB-69 75 70 21 LM INVENTOR ATTO EY Patented .iuiy 27, 192%.

UNITED s'ra'rss CHESLEY T. SMALL, ST. LOUIS, MISSOURI.

CAN-SHAPING MACHINE.

Application filed January 19, 1923. Serial No. 613,635.

In the manufacture of cylindrical paper receptacles, which I have referred to for convenience throughout the specification and claims as cans, it is desirable to reduce or neck in the ends of the can so that when the ends or caps are in position, the can will be of uniform outside diameter throughout its entire length. Although the desirability of such can construct-ion, both for coiwenience inapplying labels and packing the can, is evident, it has not come into general use because the machines and methods heretofore in use on sheet metal cannot be successfully applied to paper cans. I have found, however, that the ends of paper cans can be successfully reduced or necked in by applying to them a rolling and compressing action between an inner and an outer member both approximating to the size and shape of the can and eccentrically positioned with respect to each other at the time of operation, so as to produce a planetary movement.

ltis the object of the present invention to produce a simple and effective machine, 'operatingon the principle above outlined, forreducing or necking in the ends of paper cans.

In the accompanying drawings which illustrate a machine made in accordance with my invention, Fig. 1 is a side elevation; Fig. 2 is a front view; F ig. 3 is an enlarged section taken on the line 33 of Fig. 2; Fig. 4 is a section taken on the line 4:& of Fig. 1; Fig. 5 is an enlarged vertical section through one of the forming heads, Fig. 6 is an enlarged sectional View showing the manner of supporting the lower forming head; Fig. 7 is a section through one of the forming heads and its co-operating roll carrying member, the section through the forming head being taken on the line 77 of Fig. 5; Fig. 8 is a view similar to Fig. 7, the sec-- tion through the forming head being taken onthe line 88 of Fig. 5, and a modified form of roll carrying member being shown; Fig. 9 is a detail view showing the stop for the roll carrying member and Fig. 10 is a sectional view of a can body formed by my machine with a cap applied to one end.

1 indicates a column forming the main part of the frame of the machine and terminating at its lower end in a base 2 and at its upper end in a table 3.. Secured to the table 3 by bolts at passing through slots 5 is a casting 6 forming a gear casing and carrying a spindle 7, on which ismounted the upper forming head to be hereinafter described. The slots 5 allow of the adjustment of the casting 6 on the table 3 to align the forming heads. Keyed on the shaft 7 is a sleeve 8 (Fig. 33) carrying a pair of n'ntre gears 9. 10 is a mitre gear mounted on a shaft 11 carrying tight and loose pulleys 12 and 13, by means of which power is communicated to the machine. The sleeve 8 is provided with an annular groove engaged by a fork 14 carried on a plate 15. Carried on the plate 15 are a pair of threaded studs 16 projecting through slots 17 in the front of the casing 6 and engaged by nuts 18. By loosening the nuts 18 the plate 15 may be raised or lowered, carrying with it the sleeve 8 and thus bringing one or the other of the mitre gears 9 into engagement with the gear 10 to drive the spindie '7 in either direction as desired.

Carried on the lower end of the spindle 7 is the upper forming head consisting essentially of a chuck 20, adapted to enter the can body 21, and a surrounding annular member 22 which I have termed a crimping member. The chuck has a central aperture 23 provided with a threaded portion 24 to receive a correspondingly threaded portion on the lower end of the spindle 7 The periphery of the chuck 20 is provided with an offset 25 and the member 22 with an offset 26. The larger internal diameter of the chuck 20 is somewhat less than the internal diameter of the can body 21, to be operated upon, and the smaller internal diameter of the member 22 somewhat greater than the external diameter of said body so that when these parts are in concentric relation, as shown in Fig. 5, the end of the can may readily be entered between them. The member 22 is provided with an inward ly projecting flange 27 overlappinga shoulder 28 on the chuck and having its inner edge beveled as shown at 29. A ring 30 having a lower beveled face 31 bears on the face 29. The faces 29 and 31 are normally held in contact by springs 32 situated between the ring 30 and a backing member 33 screwed onto a threaded collar 34 on the chuck 20. A look nut 35 retains the backing member 33 in position. Sliding pins 36 prevent relative rotation between the ring 30 and backing member 33. The pressure of the ring 30 on the face 29 not only tends to keep the chuck 20 and member 22 in concentric relation, but also forces the face of the flange 27 against the face of the shoulder 28 to frietionally drive the crimping member from the chuck. hen, during the operation of forming the can body, the crimping member is moved into eccentric relation to the chuck, the ring 30 will be forced toward the backing member 33 and at the same time the pressure between the ring and flange will be concentrated a; one point, thus tending to tip the ring out of the horizontal plane. In order that this tendency to tip the ring may not cause binding of the parts, I provide the ring with a ball race containing anti-friction balls adapted to bear against the face of a bearingring 38.

The lower forming head is a duplicate of the upper head above described and its parts a e similarly numbered. The lower head has screwed into its central aperture 23 a bushing (Fig. adapted to receive the upper end of a shaft ii, a ball bearing being interposed to allow the lower chuck to rotate on the shaft with the minimum of friction. The shaft 4:1 is slidingly mounted in a bracket on the column 1 in alignment with the spindle 7. On the shaft 41 are a pair of adjustable set collars si l and 4 5 respectively. The upper collar limits the upward movement of the shaft t1. 'Movement'is imparted to the shaft through a compression spring t6 bearing at one end on the collar l5 and at the other ona sleeve l? slidingly mounted on i the shaft. rr'pin 48, carried by the collar, is

ill

engaged by the slotted end of an arm 49 pivoted at 50 to 3. lug 51 on the column 1 and provided with a bifurcated rearward e);- tension The extension 52 is connected by a link 53 with an operating treadle pivoted at 55 to the base 2. Projecting laterally from the extension 52 is a bar 56'carrying set screw 57 adapted to strike against the column 1 and thus form an adjustable stop for limiting the downward movement of the lower forming head. Securedto the end of thebar 56 a counterpoise 58 for balancing the weight of the crimping member and shaft. The counterpoise is removable so that it may be replaced by one of different weight when a crimping member of different sizeis used.

Pivoted to the extension 52 at 60 is a connecting rod 61 extending upwardly and passing through a lug (32 on one arm of a bell-crank lever pivoted at 64 to a lug on the column 1. The rod 61 is threaded to receive a pair of jam nuts 65 forming an adjustable abutment adapted to engage the lug G2 to actuate the bell-crank lever. A link 66 connects the second arm of the bel -crank lever with a sleeve 67 adjustably mounted on a threaded rod 68 carried by a slide 69 mounted between the table 3 and easing 6. Carried on the forward end of thezslide 69 is a roll casing 70. The casing '70 is preferably provided with two rolls 71, as shown in Figs. 2 and 7, but a single roll may be used as shown in Fig. 8. The object of the roll or rolls 71 is not only to move the crimping member into eccentric relation to the chucks 20 (as shown in Fig. 8} but at the same time to rotate the lower chuck from the upper one. through the medium of the members 22, thus relieving the torsion on the can bodywhich would otherwise be required to transmit all the power for driving the lower chuck. Usually the metal of the roll or rolls 71 may come directly in contact with the metal of the members \Vhcn, however, the power to be transmitted is considerable, it is desirable to apply, either to the members 22, or to the rolls Tl, or to both, a covering of yielding material to increase the friction. In Fig. l l have shown such a-covering in the form of rubber rings 73 applied to thecrimping members A coil spring Tat operates to return the roll casing TU after it has been operated by the treadle and this return movement is limited by an ad'ustable stop 75 '(Fig. 9) carried by the sli e 69 and striking against a shoulder on the casing (5. By properly limiting the return movement of the roll holder, the rolls 71 assist the rings 30 in centering the crimping member with respect to the chucks.

The operation of my machine is briefly as follows. The machine is adjusted for the length of can body to beoperated upon and power is applied through the tight pulley 12 to rotate the spindle If the can body is spirally wound, the machine will be found to operate more etfectively with the spindle T rotatingin one directionthan whenrotat- .mg in the other, accordingly as the body is wound in a right or left hand spiral. The proper direction of rotation is secured by shifting the collar 8 to bring one or the other of the .mitre gears 9 into engagement with the gear 10. One end of the can body 21 is inserted between the member 22 and chuck 20 of the lower forming head, which also serves as a can support, and the treadle 5st is depressed. Operating through the links and extension 22, the treadle swings the arm 49 on its pivot to raise the shaft l1 and, consequently, the lower forming head so as to cause the upper end of the can body to enter the space between the crimping member and chuck of the upper forming head. This movement is limited by con- .tac't of the set. collar with the lower end of the bracket 43. Furthermovement of the treadle compresses the spring 46. The connecting rod 61 is drawn downwardly during the entire movement of the treadle and its jam nuts 65 are so adjusted as to come in contact with the lug 62 just at, or slightly after. the time the upward movement of the shaft 41 is arrested. Contact of the jam nuts 65 with the lug 62 rocks the bellcrank lever 63 on its pivot, thus forcing the slide 69 and attached roll casing 70 forward to move the crimping members 22 into eccentric relation to the chucks to reduce the ends of the can body, as shown in Fig. 10, by rolling pressure between said parts. It will be noted by reference to Fig. 5 that when the backing member 33 is set up against the end of the bearing 38, as shown in this figure, there is just suificient room between said member and the shoulder 28 to prevent binding of the crimping member. With this adjustment, the end of the can body will be turned over only suthciently to fill the slightly rounded corner of the shoulder 28. When, however, it is desired to turn over the end of the can to greaterextent, the lock nut 35 is loosened and the backing member 33 retracted a distance equal to the thickness of the can wall, after which it is secured in position by the lock nut. The end of the can may-now be forced into the space between the flange 27 and shoulder 28. It will, of course, be understood that with the latter adjustment, the set collar 44 must be moved to allow the forming heads to approach each other somewhat nearer for a given length of can body than when the end of the can is not turned over.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. In a device of the class described, the combination with a pair of chucks each adapted to enter one end of a can and provided with an annular crimping member, of a roll. adapted to simultaneously cooperate with both said annular members to move them laterally and to communicate motion from one to the other, and means for moving said chucks toward each other, said means also operating said roll.

2. In a device of the class described, the combination with a chuck adapted to enter a can body, of a crimping member surrounding said chuck and provided with an overlapping flange, the inner face of said flange being inclined, a yieldingly mounted annular member provided with an inclined face bearing on the inclined face of said flange, and an adjustable backing member for said annular member forming a positive stop for the crimping member.

3. In a device of the class described, the combination with a chuck adapted to enter the can body, of a crimping member surrounding said chuck and provided with an overlapping flange, the inner face of said flange being inclined, a yieldingly mounted annular member provided with an inclined face bearing on the inclined face of said flange, and an anti-friction bearing for the inner face of said annular member.

4. In a device of the class described, the

combination with a chuck adapted to enter a can body and provided with an off-set, of a hollow crimping member surrounding said chuck and provided with a corresponding off-set, said crimping member being adapted I to be moved into eccentric. relation to said chuck, and a beveled spring actuated ring interposed between said chuck and crimping member for centering the latter.

5. In a device of the class described, the 'I' GHESLEY T. SMALL. L 8.

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