US1972121A - Take-off mechanism for tube machines - Google Patents

Description

Sept. 4, 1934. l P'. WITTE I 1,972,121

TAKE-OFF MECHANISM 'FOR TUBE MACHINES Filed Aug. 18, 1933 3 Sheets-Sheet l INVENTOR LWELF ATTORN EYJ Sept; 4, 1934. P. WlTTE I TAKE-OFF MECHANISM FORTUBE MACHINES Filed Aug. 18

1935 3 Sheets-Sheet 3 mill INVENTOR jg L 71/; T7252 F M ATTORNEYS i atented Sept. 4, 1934 TAKE-OFF MECHANISM FOR TUBE I MACHINES Paul Witte, New Milford, N. J., assignor to White Metal 'Manufacturing Company, 1 Hoboken; N. J., a corporation of New Jersey Application- August 18,1933; Serial'No. 685,675 Claims. .(01. 207- 9) This invention relates broadly to tube makingmachines and more specifically to improvements in means for stripping tubes from the punch member thereof. It is broadly old'to provide tube 5 machines consisting of a reciprocating punch carried by a laterally swingable 'arm, said punch being adapted to coact with the die so that upon the downward movement of the pimchit engages a disc or slug within the die and by extrusion forms a tube of block tin or similar ductile metal on the punch. Various forms of stripping devices have been previously-devised for removing the tubes from the punch. But these have been detailed, complex mechanisms which frequently get out of order because of the rapid rate at provides a greatly simplified construction of strip per device. h v i g The invention will be fully apparent from the following specification when read in connection with the accompanying drawings and'will be defined with particularity in the appended claims. In the drawings, Fig. 1 is a front view of a punch press equipped with my improved form of tube take-off mechanism; Fig. 2 is an enlarged perspective view of the take-off mechanism and related 3 parts; Fig. 3 is a horizontal section on line 3-3 of Fig. 1; Fig. 4 is a detailed plan view of a supporting head and stripper sleeve; Fig. 5 is a face view of Fig 4. with parts shown in section in the interest of clearness; and Fig. 6 is a detailed section on line 6-6 of Fig. 4.

Referring in detail to the drawings, 10 represents the frame of a conventional form of punch press having a main drive shaft 12 which through drive pinion 14 and gear 16 rotates a crank shaft 18 carrying crank arms 20 to the crank pin 22 to which there is connected a pitman 24. This pitman is operatively connected with a cross head 26 which slides vertically between suitable guides 28. The vertically reciprocating cross head car- '45 ries a horizontally swingable arm 30 to the outer end of which there is secured a punch 32. This punch coacts with the die 34 so as to form tubes from slugs or discs S fed to the die by suitable feed mechanism from a chute 0. As the punch descends it strikes one of the discs. This results in the forming operation by a process of extrusion and thus forms a tube, as indicated at T in Fig. l, which surrounds the plunger.

As the punch 32 ascends the arm 30 is swung outwardly to permit removal of the tube. The

machine thus far briefly described is of c-onventional type and my invention relates specifically to improvements in the means for removing the tube Tfrom the punch 32. Secured to the frame of the machine I provide a fixed support 36 which in the embodiment illustrated is in the form of a vertical rod screwed into the bed of the ma-' chine and locked by a nut 38. Slidable on the support there is a head 40 which carries a sleeve indicated generally at 42. I'his sleeve is formed of two complementary parts 44 and 46 each of g which is provided with shouldered enlargements 48 so as to form an annular groove 50 for engagement with the annular projection 52 formed in the head. The parts 44 and 46 of the sleeve are held in place by a keeper 54 which is secured to the head by a screw 56 as clearly shown in Figs. 4 and 5. For holding the two parts of the split sleeve in proper relationship with one another I preferably employ set screws 58 and 60 as indicated in'Fig. 6. Springs 61 are preferably inserted between theaends'of the screws 58 and 60 and the parts 44 and 46 so as to provide a resilient pressure of the parts against the punch 32.

The head 40 has a downwardly extending hub 30 portion 62, the wall of which is separated to form a cam slot 64. A block 66 is provided which makes asliding fit with the cam slot, said block being swiveled on a stud bolt 68 screwed to the fixed support 36. With parts thus arranged it is 35 apparent that when the swinging arm 30 moves upwardly and swings outwardly that because the sleeve held by the head 40 embraces the punch the swinging movement will also be applied to the head. This swinging movement of the head may, because of thecam and pin connection between the head and the fixed support, cause a movement of the sleeve relatively to the punch. This movement is downward and therefore is efiective to strip the tube T from the punch. In short, the swinging movement of the punch is transformed into an endwise movement of the head and the stripping sleeve. In this waythe endwise movement secured is much greater than that which would result merely from the reciprocation of the punch alone. The reciprocating movement of the punch alone is less than the length of the tube. Thus by providing means for transforming the swinging movement of the punch I secure sufficient movement to enable the tube to be properly stripped from the die. It might be thought that the same result could be secured merely by increasing the stroke of the punch and the stroke of the crank shaft. But such procedure would be impractical because the pro er formation of the tube requires only a very short stroke of the punch. Moreover, the punches themselves are massive machines which cannot be greatly modified without going to great expense. They can also be operated much more efficiently at a high speed when employing a small punch stroke.

For receiving the tubes as they are stripped from the punch I provide a hopper 70, which has a substantially vertical portion '72 and 'a'downwardly inclined portion '74, the vertical portion being cut away as indicated at '76 in order to permit the punch to swing into proper discharge position prior to the stripping of the tube therefrom.

While I have described quite specifically the particular embodiments of the present invention herein illustrated it is to be understood that various modifications and substitutions and equivalents may be made by those skilled in the and pin connection between the support and the head for causing the sleeve to move relatively v to the punch upon the swinging movement of the latter so as to stripthe tube from the punch.

.2. In a machine for making collapsible tubes having a fixed, die and a vertically reciprocating punch carried. by a horizontally swinging arm,

a stripper mechanism for removing tubes from the punch comprising a sleeve embracing the punch,v a vertically movable head to which said sleeve is secured, a fixed upright for guiding said head and a pin secured to said upright and coacting. with a cam slot formed in a hubv on said head whereby the swinging movement of the punch imparts a longitudinal sliding movement of said sleeve relatively to the upright and the punch so as to strip the tube from the latter.

3. In a machine for making collapsible tubes having a fixed die and a reciprocating punch carried by a swingable arm, a stripper mechanism for removing tubes from thepunch comprising a sleeve embracing the punch, a supporting head therefor slidable on a fixed upright rod, and a hub on said head having a cam groove coacting with a block swivelled on said rod and effective to cause the sleeve to move lengthwise of said punch upon swinging movement of the punch so as to strip the tube therefrom.

4. In amachine for making collapsible tubes having a fixeddie and a reciprocating punch carried by a swingable arm, a stripper mechanism for removing tubes from the punch comprising a sleeve embracing the punch, a supporting head therefor slidable on a fixed support, and coacting means between said head and said support efiective to cause the sleeve to move lengthwise of said punch upon swinging movement of the. punch so as to strip the tube therefrom and a receiving hopper located in the path of the swinging movement of said punch and having a cut away portion to permit the entrance therein of the punch.- 4 A 5v. Ina machine for making collapsible tubes having, a fixed die and a reciprocating punch carried by a swingable arm,;a stripper mechanism for removingtubes from the punch comprising a sleeve embracing the punch, a supporting head therefor slidable on a fixed upright and coacting means betweenisaid head and saidsupport effective to cause the sleeve to move lengthwise of said punch uponswinging movement of the punch so as to strip the tube therefrom, said sleeve being formed of complementary pieces and a keeper slidably mounted in said head for removably securing'said pieces to the head.

PAUL WITTE.

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