US2229488A - Combination bolster and punch press - Google Patents

Description

Jan. 21, 1941. c. BARBIERI 2,229,488

GQMBINA'I'ION BOLSTER AN!) PUNGH PRESS Fi1ed Nov. 27, 1959 2Lsmm' smn 1 SEE-2 ZZYVEHZUF Cesare Barier] Patentecl Jan. 21, 1941 UNITED STATES PATENT OFFICE Cesa1'e 'Barbieri, New York, N. Y. assignor to Dixie-Vortex C'ompany, Chicago, Ill. a corporation cf Delaware 1 Applicatiohll'ovember 27, was, Serial N0. 306,311

3 Claims.

This invention relates to a combination bolster and punch press for economically blanking comparatively thin material and adapted particularly for punching 1arge size blanke of flexible mate rial.

Heretofore in the blanking of comparatively 'light material such a-s sheet metal, paper or the like, die sets, comprising bolster and punch holder elements, have been employed and these die sets Were mounted and secured on the beds of Standard punch presses anal with the punch holder adapted for securing to the reciprocating punch head for operation cf the die Set. Such procedure involves the expense of costly standard pu'nch presses and the operation thereof, particularly where the material 110 be blanked is comparatively thin end requires very little power for cutting or punching thereof.

An important object of my invention is to elim- 20 inate the necessity for the use of a standard expensive type of punch press in the blanking of material when comparatively little power is required for the punching operation, and thereby materially reduce the cost of equipment and 25 operation.

In aceordance with my invention, I have produced a combination or unitary structure comprising a bolster element for supporting a die shoe or plate, and a punch holder element guided 30 relative to the bolster element and operated or reciprocated by driving means mounted o-n end supported by the bolster structure. In other words, my improved structure may be considered as a die supporting bolster structure With 35 a punch press mounted thereon to form a. unitary assembly or structure therewith. Such unitary structure may be readily driven as by an electric motor of a capacity commensurate with the power necessa.ry for the punching or blank- 40 ing operation by the unitary structure.

My improved structure is fully disclosed on the accompanying drawings in which:

Figure 1 is a. plan view;

Figure 2 is a side elevation;

45 Figure 3 is an end elevation;

Figure 4 is a section on plane IV--IV Figure 1; anti Figure5 is a section on plane VV Figure 1.

The structure disclosed comprises the bolster 50 element B and the punch press element P. The bolster element comprises the base plate I0 on which ma.y be detachably secured a die shoe or plate II 120 span the blank discharge passageway I2 through the bolster base, the die plate being 55 cut out to the size and shaped corresponding with the blank to be punched, the cutout I3 of the die platze shown beillg rectangular.

The punch press element comprises the punch holder I4, shown in the form of a. rectangular plate having upstanding bosses I5 at its corners 5 which are bored. to receive the leader or guide pins I6 secured to and extending upwardly from the bolster element base II]. The punch holder supports the punch or die member Il which is detachably secured against its under face, the 10 punch being shown in the form of a rectangular .plate for entering the rectangular cutout I3 for cutting corr-espondingly shaped blanke from the material fed between the die pla.te end punch as the punch holder is vertically reciprocated on the leader pins.

Preferably integral With the bolster base III and at I;he ends thereof are bearing pedestals I8 and I9 terminating in journal boxes and 2I for journaling a shaft 22. This shaft ha-s 20 eccentric or crank portions 23 for receiving crank rods 24 which a.t their lower ends receive pins 25 supported in ea.rs 26 extending upwardly from the punch holder plate I4. Two crank rods are shown engaging with the opposite ends of the 25 punch holder, end upon rotation of the shaft 22 the punch holder will be reciprocated on the leader or guide pins I6 for repeatedly engaging the punch I1 in the die plate cutout I3 for blanking the material fed through the structure. The punchholder plate I4 has the recesses 21 ab its ends for receiving and clearing the bearing pedestals for the shaft 22.

In the driving arrangement shown Tor the shaft 22, a, gear 28 is mounted on one end of the shaft and a flyviheel 28 is preferably mounted on Ehe other end so as to balance the Weight of the gear and hold the shaft 22 balanced in its bearings. An ofiset boss 29 on the outer side of ehe bearing pedestals I8 supports a stud shaft 30 for a transmission gear 3I and pinion 32 assembly, the pinion meshing with the gear 28 on the shaft 22 and the gear 3I being meshed by the drive pinion 33 on the armature shaft 34 of a driving source such as an electric motor 35. The gearing train suitably reduces the motor speed for the desired speed of the punch operating shaft 22.

Adjustably mounted 011 the shaft 22, as by means cf setscrews 36, are the hubs 31 of stripper cams 38. Two such ca m structures are shown arranged adjacent 120 and inwardly of the crank rods 24. These cams cooperate with -the stems 39 of stripper heads 40, these heads being circular end normally engaging in circular passageways 4I through -the punch I1, the stems extending through tzhe guide passageways 42 in the punch holder plate I4. Springe 43 encircle the stems betzween tzhe punch holder platze and oollars 44 an the stems and tend to hold the ends of the stems againstz -the cam surfiaces cf the carns 38. The cam peripheries are shown as being circular butz eccentzric relative to tzhe shaftz 22, and atz the pointz fartzherestz distantz from the shaftz axis each cam has an abrupt extension or bootzh 45.

Normally tzhe punch holder is in 'itzs 1ipper positzin as shown 011 tzhe drawings. When ehe shaftz 22 is turned, tzhe crank rod connection will cause tzhe punch holder tzo be shiftzed downwardly on tzhe pins I6 tzo force the punch IT through the stzock tzo be blanked, and a distance intzo tzhe cutoutz I3 of tzhe die plate. The setztzing of tzhe stzripper cams relative to tzhe crank shaftz parts 23 is such thatz as tzhe punch holder moves downwardly the cams will shiftz tzhe stems 39 and stzripper heads 40 downwardly in tzhe passageways 4l in tzhe punch so tzhat, tzhe stzrlpper heads Will hold tzhe stock during blanking tzhereof, and during tzhe final movementz of the cams, their teetzh 45 Will eflectz quick final downward shift; of tzhe stzrlpper heads tzo foree through tzhe die platze cutoutz I3 and intz0 tzhe discharge passage I2 tzhe blank Which has been punched from tzhe stock. During tzhe second half rotation of the shaft; 22, tzhe strippers Will be retzurned tzo the normal positzi0n by tzhe springs 43 as tzhe punch holder is raised back tzo normal position. Thus as the structzure operatzes, tzhe reciprocatzing punch holder punches the blanks from tzhe stzool and tzhe strippers discharge the blanks into the discharge pass'ageway I2, and the blanke may be received oh suitzable conveyor means (notz shown) Thus by combining a die supportzing bolstzer structure and punch press structzure into a unitary assembly, blanking, partzicularly of comparatzively light stock, can -be more economically and efiicientzly accomplished and tzhe necessi-tzy for tzhe use of standard expensive type punch presses is eliminatzed. In my improved combination structure, tzhe die and punch elementzs are detzachably applied and tzhe die and punch elementzs for any desired shape of blanke can be quickly and readily mountzed in position.

I have shown a practzical and efilcient emloodimentz of my inventzion butz I do not;-desire tzo be limitzed tzo tzhe exactz constzructzion and arrangement; shown and described as changes and modificatzions may be made witzhoutz departzing from the scope of tzhe inventzion.

I claim as follows:

1. A punching assembly for punching lightzweight; material such as paper and the like, said assembly comprising a rectang*ular base platze provided witzh an upstanding stzub pin atz each of its four corners, a die plate seatzed on said bas platze, a rectzangular punch holder platze provided witzh upstanding and outzstanding bosses on each of it's four c0rners, said stub plus being entered in said bosses for guided sliding movement of said holder platze on said plus, a die on said holder plate, a -pair of upstanding bearing pedes'oals on said base platze, one atz each of opposite ends of said base platte and witzh each disposed betzween a pair of bosses and in spaced relation tzo said holder platze, a revolvable shaftz journaled in said bearing pedestzals and disposed above said holder plante, means depen-dirrg firom said shaftz and pivotzally connectzed. tzo said shaftz and to said holder platze, and stripper means operably connectzed witzh said shaft and movable in said die holder platze.

2. A punching assembly for punching lightzweightz material such as paper and tzhe like, said assembly comprising a rec-tzangular base plate provided with an upstzanding stzub pin at each of its four corners, a die plate seatzed on said base platze, a rectzangular punch holder platze provided witzh upstanding and outzstzanding bosses on each of its four corners said stzub pins being entered in said bosses for guided sliding movementz of said holder platze on said pins, a die 011 said holder platze, a pair of upstzanding bearing pedestzals on said base platze, one atz each of oppositze ends of said base plate and Witzh each disposed betzween a pair of bosses and in spaced relation tzo said holder platze, a revolvable shaftz journaled in said bearing pedestzals and disposed aloove said holder platze, link means depending from said shaftz and pivotzally connectzed to said shaft; and tzo said holder platze, a stzripper rod resilien-tzly supported on said holder platze for movementz therein, and a cam on said shaftz operably conneeted witzh said stripper rod tzo intermitztzentzly depress said rod.

3. A punohing assembly for pl.lnching lightzweightz material such as paper and tzhe like, said assembly oomprising a base platze provided witzh upstzanding stub pin means, a die platze seated on said base plate, a punch holder platze provided 1 Witzh vertically extending bosses, said stzub pin means being entered in said bosses for guided sliding movement of said holder plate on said pin means, a die on said holder platze, upstzanding bearing pedestzal means on said base platze disposed betzween spaced bosses and in spaced relatzion tzo said holder platze, a revolvable shaftz journaled in said bearing pedestzal means and disposed above said holder platze, and means depending from said shaftz and connectzed to said shaftz and tzo said holder platze for moving said holder plate up and down in itzs punching stzr0ke.

CESARE BARBIERI.

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