US2494921A - Sheet metal working press - Google Patents

Description

Jan., M, i950 J. N. wl-:zLAND 2,494,921

SHEET METAL WORKING PRESS Filed Sept. 26, 1947 5 Sheets-Sheet 2 R O T N E V m ATTORNEY Jah/7 /V Wel/wm Jan. 17, 1950 J. N. WEILAND SHEET METAL WORKING PRESS 5 Sheets-Sheet Z5 Filed Sept. 26, 1947 fifty Jam., W, W5@ J. N. WEALAND SHEET METAL WORKING PRESS 5 Sheets-Sheet 5 Filed Sept. 26, 1947 u /QE yatented Jan. 17, 1950 Z-LUNITED y'STATES PATENT OFFICE SHEET METAL WORKING PRESS vJohn N. `Weiland, Cleveland, Ohio, assignor to "The'Clev'elandPunch & Shear Works' Company,

Cleveland, Ohio, acorporation-of Ohio fApplication September 26, 1947, Serial No. 776,215

"3 Claims.

isdirectly-supported.and guidedby theuprights 10 andwthefdieslideis mountedin a verticalopening which extendsA throughthe blankholder slide. The die :slide is reciprocatedby .acrankshaft .through a suitable. connecting rod -and the `blankh'oldertslide. is reciprocated vin timed. relation .15 theretozby-.suitable .mechanism which is driven .from the crankshaft.

Infoperation,.the blankholder slide is moved downwardly:inadvance.of the die slide until. the

fblankholder engages `the .material to be formed. 20

vThe"blankholder -4slide then dwells .holding the material while the die slidetcontinues on .down .and -formsthe-material. ...After the forming is completedy-both :the dieslidefand .the `blankholder slide move back 'to .their uppermost position .25 readyforfthenextoperation The mechanism -for idriving the blankholder .-slide;.with.;the properdwell in its movement con- :sists :of various shafts, toggles, vslides and links which in priori pressesy `vhave .been `quite compli- .-30 catednandrcumbersome. .Also inprior presses of this..type,1.the. entire operating Vmechanism I vwas .The;principal object-.of this invention .is to .simplifyandfcompact the operating .mechanism for thefslides .impresses 4of .this character. .5.40

Another -objectoffthe invention .is -to entirely =-en.close..the -whole .-slide operating mechanism -withinothe.crown-of. thepressin order to eliminnate-.possibilityof .damage thereto andr to .imxpr-ovetherappearance.of the presszas. a whole.

52.45 lOther .and..'more `limited. objects. of ...the .invenf tion..willbe A.apparent from .the followingv speci- -cation .and the accompanying drawings, form- -inga part thereof. wherein:

:Figrl isanrend .elevation of-.a .press construct-.50 ed` accordingto. my invention:

.Fig..2.is.a frontelevationthereof Fig, .3...is-.a. sectional. end` .elevation thereof on .1a .largerscale .than .thatofgFg .l showing part of `theoperating.mechanism, the plane -of Athe,-.,5

the crankshaft is rotated. The gears .bearings 21 and 28.

(Cl. 11S-38) section being indicated bythe line 3--3 on Fig. 4;

Fig. 4 is a front elevation, on the same scale as Fig. '3, with the front ofthe crownin section to expose the mechanism therein;

Fig. 5 is a .View similar to Fig. 3, showing .the mechanism in a different position;

Figj is a sectional plan View, the plane of the section being indicated byVv the line 6-6 on Fig. '4;

Fig. 7 is a fragmentary vertical section `taken on theline 'I-l on Fig. 3;

Fig. 8 is a front elevation of one of the operating slides.

Referring now to the drawings by reference characters, the numeral I indicates a base from which a pair of spaced uprights 2 and 3 extend. Supported on the upper ends of the uprightsZ and 3 is a crown generally indicated by the numeral. The base, uprightsfand the crown are heldin proper position'with respect to each other .by .keys 5, and they are 'all bolted rigidly'together by the tie-rods 6 andnuts l.

.A blankholder slide 8 is reciprocally mounted between the uprights 2 and 3 beneath the ,crown.4, and is held in position by suitable gibs 9. A die-slide I0 is reciprocally mounted vin an opening II which extends through the blankholder slide from the top to the bottom vthereof. .These slides are operated in timed relation to each other by a crankshaft I2 through' suitable mechanism to be described hereinafter.

The crown Il comprises a mid-section I3 and va. pair of chambers I4 and I 5, one rat each side of the mid-section I3. The mid-section I3 is open at the bottom thereof as indicated at I3et and the chambers Ill and I5 are closed by removable. cover plates I6.

The crankshaft .I2 is rotatably supported by bearings I'I and I8 in the crown of the'press. The ends of the crankshaft extend into the chambers I4 and I5 and ,have rigidly secured thereto large gears I9, one on each end thereof, within .thechambers I4 and I5 through which I9 are driven from a motor 20 through suitable mechanism, .allof which is mounted on the top 2I of the crown and is enclosed by a removable cover v22.

. In operation. the motor20 continuously drives `a ywheel 23 through a pulley 24 anda plurality of belts 25. The flywheel 23 is rotatably mounted .on a shaft 26 which is suitably `supported 'in The shaft 26 has secured .to .one end .thereof a pinion gear 29 which .meshes with a larger gear Bwhich is keyed to a shaft 3| rotatably supported by bearings 32 and 33. The shaft 3| also has keyed thereto pinion gear 34 which meshes with a large gear 35 keyed to a shaft 36 which is mounted in suitable bearings 37. The shaft 36 extends all the way across the crown of the press with ends thereof disposed within the chambers I4 and I5. There is a gear 38 secured to each end of shaft 36 and these gears 38 mesh with the large gears I9. The flywheel 23 which is rotatably mounted upon the shaft 26 is adapted to be connected to and disconnected from shaft 26 by a suitable clutch and brake mechanism 39. The clutch mechanism 39 is operated through suitablecontrol mechanism not shown. Any one of a number of mechanisms of this type which are available will work equally well. These control mechanisms are such that they can be operated either manually or automatically, or by a combination of both automatic and manual control. Generally, the `operator initiates the operation of the press by pushing a suitable button. The press will then go through one cycle of operation and stop automatically.

The die-slide I is reciprocated by the crankshaft I2 through a suitable connecting rod y48, and the blankholder slide 8 is reciprocated in a timed relation to the die-slide I0 by suitable mechanism which is operatively connected to the crankshaft I2 within the chambers I4 and I5. In operation, the blankholder slide 8 is moved downwardly in advance of the die-slide I0. At the bottom of its stroke, the blankholder slide will dwell during approximately 120 rotation of the crankshaft I2. During this dwell, the blankholder which issecured to the blankholder slide will grip and hold the edges of the blank being formed while the die slide continues on down forming article to be shaped. The mechanism for operating the blankholder slide 8 includes a pair of rock-shafts 4I and 42. These rock-shafts are rotatably mounted in suitable bearings 43 in the crown of the press and are disposed above the crankshaft I2 with one rock-shaft at each side thereof., 'I'hese rockshafts extend across the mid-section I3 of crown 4 and into the chambers I4 and I5. The rockshafts 4I and 42 are connected to the blankholder slide 8 by ar-ms 44 and links 45. The arms 44 are rigidly keyed to the rock-shafts 4I and 42 and are pivotally connected to the upper ends of the links 45 as indicated at 46. The lower ends of the links 45 are pivotally connected to the blankholder slide 8 as indicated at 41. The arms 44 and links 45 constitute toggle links which assume a straight line position with respect to each other when the blankholder slide is at the lower limit of its movement as shown in Figure 3. When the blankholder slide is at the upper limit of its movement, the arms 44 and links 45 assume the position shown in Fig. 5.

The rock-shafts 4I and 42 are oscillated by the reciprocation of a pair of operating slides 48 which are reciprocally mounted in the chambers I4 and I5. The operating slides 48 are guided in their up and down movement by a pair of guides 49 and a key 58. The guides 49 are secured to the end walls I of the crown adjacent to the lower ends of the operating slides 48 and engage the rear surface and the sides of the slides 48. The keys 50 are secured to the end walls 5 I, adjacent to the upper ends of the slides 48 and extend into suitable slots 52 in the rear face of the slides 48. The operating slides 48 are reciprocated by eccentrics 53 through eccentric straps 54 which yare pivotally connected to the operating slides 48 as indicated at 55. The operating slides 48 have elongated apertures 56 therethrough through which the ends of the crankshaft I2 extend, and the eccentrics 53 are formed in- 5 tegrally with the gears I9.

The operating slides 48 are connected to the rock-shafts 4I and 42 by .arms 60 and links 6I. The arms 60 are rigidly securedrv to the ends of the rock-shafts 4I and 42 within the chambers I4 and I5. The links 6I are pivotally connected at one end thereof to the operating slides 48, as indicated at 62, and at the other end thereof are pivotally connected to the arms 60 as indicated at 63. The arms 60 and links 6I, like the arms 44 and links 45, also constitute toggle links.

The eccentrics 53, operating slides 48, and the toggle connections just described are so arranged with respect to each other that they produce the desired dwell in the blankholder slide at the lower limit of its movement. This will be apparent from Fig. 3. In this position of the various parts, there will be no appreciable reciprocation imparted to the slides 48 by the rotation of the crankshaft I2. What littley reciprocation there is of the slides 48 will be dissipated by the toggle connection between the slides 48 and the rockshafts 4I and 42, and further dissipated by the toggle connections between the rock-shafts 4I and 42 and the blankholder slide 8.

From the foregoing, it will be apparent that I have provided a sheet metal working press of the double action typewhich is very compact and efficient in operation, and in which all of the various parts of the operating mechanisms are entirely enclosed Within the crown of the press. With this arrangement, the press can be lubricated and maintainedmuch easier, as it is impossible for dirt or foreign matter to get 'into the major portion of the operating mechanism. Also all danger of the press being injured by falling objects striking or becoming entangled with the mechanism is eliminated. l

It is to be understood that I am not restricted to the specific construction shown and described herein, as various modifications may be made thereto within the scope of the appended claims.

Having thus described my invention, I claim:

1. In a device of the character described, the combination of a base, a pair of spaced uprights extending upwardly from said base, a crown removably mounted upon the upper ends of said uprights and spanning the space therebetween, a blankholder slide reciprocally supported by said uprights between said base and said crown, a 65 die-slide reciprocally supported by said blankholder slide, said crown comprising a mid-section open at the bottom thereof and a closed chamber at each end thereof, a crankshaft rotatably mounted in bearings supported by the 00 end walls of the mid-section of said crown, the ends of said crankshaft extending into said closed chambers, a large gear secured to each end of said crankshaft within said closed chambers, a

drive shaft rotatably mounted in bearing secured 05 to and extending upwardly from the top wall of said crown, said drive shaft extending across the top of said crown and having each end thereof extending into one of said closed chambers, a pinion gear secured to each end of said drive shaft 70 within a closed chamber and meshing with the large gear therein, driving means for said drive shaft supported by the top of said crown, said driving means including a rotatable flywheel and a reduction gearing between said flywheel and said drive shaft, a pair of rock-shafts rotatably mounted in bearings supported by the end walls of the mid-section of said crown, with the ends of said rock-shafts disposed within said closed chambers, operative connections between said rock-shafts and said blankholder slide through which said blankholder slide is reciprocated as said rock-shafts are oscillated, said operative connections being disposed within the mid-section of said crown, operative connections within each of said closed chambers between said large gears and the ends of said rock-shafts through which said rock-shafts are oscillated, and operative connections between said crankshaft and said dieslide through which said die-slide is reciprocated by the rotation of said crankshaft.

2. In a device of the character described, the combination of a base, a pair of spaced uprights extending upwardly from said base, a crown removably mounted upon the upper ends of said uprights and spanning the space therebetween, a blankholder slide reciprocally supported by said uprights between said base and said crown, a die-slide reciprocally supported by said blankholder slide, said crown comprising a mid-section open at the bottom thereof and a closed chamber at each end thereof, a crankshaft rotatably mounted in bearings supported by the end walls of the mid-section of said crown, the ends of said crankshaft extending into said closed chambers, a large gear secured to each end of said crankshaft within said closed chambers, a drive shaft rotatably mounted in bearing secured to and extending upwardly from the top wall of said crown, said drive shaft extending across the top of said crown and having each end thereof extending into one of said closed chambers, a pinion gear secured to each end of said drive shaft within a closed chamber and meshing with the large gear therein, driving means for said drive shaft supported by the top of said crown, said driving means including a rotatable flywheel and a reduction gearing between said flywheel and said drive shaft, a pair of rock-shafts rotatably mounted in bearings supported by the end walls of the mid-section of said crown, with the ends of said rock-shafts disposed within said closed chambers, operative connections between said rock-shafts and said blankholder slide through which said blankholder slide is reciprocated as said rock-shafts are oscillated, said operative connections being disposed within the mid-section of said crown, operative connections within each of said closed chambers between said large gears and the ends of said rock-shafts through which said rock-shafts are oscillated, said second mentioned operative connections including a reciprocal slide in each of said closed chambers, said slides being supported and guided by suitable supports carried by the end walls of the mid-section of said crown, and operative connections between said crank-shaft and said die-slide through which said die-slide is reciprocated by the rotation of said crankshaft.

3. In a device of the character described, the combination of a base, a pair of spaced uprights extending upwardly from said base, a crown removably mounted upon the upper ends of said uprights and spanning the space therebetween, a blankholder slide reciprocally supported by said uprights between said base and said crown, a die-slide reciprocally supported by said blankholder slide, said crown comprising a mid-section open at the bottom thereof and a closed chamber at each end thereof, a crankshaft rotatably mounted in bearings supported by the end walls of the mid-section of said crown, the ends of said crankshaft extending into said closed chambers, a large gear secured to each end of said crankshaft within said closed chambers, a drive shaft rotatably mounted in bearing secured to and extending upwardly from the top wall of said crown, said drive shaft extending across the top of said crown and having each end thereof extending into one of said closed chambers, a pinion gear secured to each end of said drive shaft within a closed chamber and meshing with the large gear therein, driving means for said drive shaft supported by the top of said crown, said driving means including a rotatable flywheel and a reduction gearing between said flywheel and said drive shaft, a pair of rock-shafts rotatably mounted in bearings supported by the end walls of the mid-section of said crown, with the ends of said rock-shafts disposed within said closed chambers, operative connections between said rock-shafts and said blankholder slide through which said blankholder slide is reciprocated as said rock-shafts are oscillated, said operative connections being disposed within the mid-section of said crown, an eccentric secured to each of said large gears, a reciprocal slide in each of said closed chambers slidably supported and guided by suitable supports carried by the end walls of the mid-section of said crown, operative connections between said slides and said eccentrics through which said slides are reciprocated by said eccentrics, operative connections between said slides and the ends of said rockshafts through which said rock-shafts are oscillated by said slides, and operative connections between said crank-shaft and said die-slide through which said die-slide is reciprocated by the rotation of said crankshaft.

J OI-IN N. WEILAND.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,541,025 Beyer June 9, 1925 2,364,661 Rode Dec. 12, 1944

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