US2769493A

US2769493A - Stop mechanism for punch presses

Info

Publication number: US2769493A
Application number: US500009A
Authority: US
Inventors: Willart A Karsoe
Original assignee: Individual
Current assignee: Individual
Priority date: 1955-04-07
Filing date: 1955-04-07
Publication date: 1956-11-06
Anticipated expiration: 1973-11-06

Description

Nov. 6, 1956 w. A. KARSOE 2,769,493

STOP MECHANISM FOR PUNCH PRESSES Filed April 7, 1955 3 Sheets-Sheet l INVENTOR W. A. KA RSO E ATTORNEYS Nov. 6, 1956 w. A. KARSOE STOP MECHANISM FOR PUNCH PRESSES 3 Sheets-Sheet 2 Filed April 7', 1955 6 I INVENTO R WA. KAIQS E ATTORNEYS Nov. 6, 1956 w. A. KARSOE STOP MECHANISM FOR PUNCH PRESSEIS 5 Sheets-Sheet 3 Filed April 7, 1955 INVENTOR W. A. K A RSOE BY @W!% ATTORNEYS United States Patent STOP MECHANISM FOR PUNCH PRESSES Willart A. Karsoe, Flint, Mich. Application April 7, 1955, Serial No. 500,009

3 Claims. (Cl. 164-59) This invention relates to an attachment for punch presses, and more specifically, the invention is directed to the provision of a stop mechanism associated with the die of the press for gaging the intermittent movement of the stock as the stock is manually or automatically moved through the die for each successive punching operation.

One of the primary objects of this invention is to provide a material stop gage which is positive in operation, and which is accurate in the gaging of material as the same is used in manufacturing operations employing the use of progressive and blanking operation dies.

A further object of this invention is to provide a stop gage of the type to which reference has been made above, the gage eliminating the necessity for lifting material thereover as is required in prior art devices of a related nature, whereby the operator has the free use of his hands during the operation of each press cycle.

A still further object of this invention is to provide a positively operated material stop device together with means which are automatically operative to release the material freeing the same to continue in motion.

Other and further objects and advantages of the instant invention will become more evident from a consideration of the following specification when read in conjunction with the annexed drawings, in which:

Figure l is an exploded perspective view of a material stop gage constructed in accordance with one embodiment of this invention.

Figure 2 is a medial longitudinal cross-sectional View of the gage illustrated in Figure 1.

Figure 3 is a cross-sectional view taken on the vertical plane of line 33 of Figure 2, looking in the direction of the arrows.

Figure 4 is an exploded perspective view of a material stop gage constructed in accordance with a second embodiment of this invention.

Figure 5 is a side elevational view of the gage illustrated in Figure 4 with a side wall thereof having been removed.

Figure 6 is a cross-sectional view taken on the vertical plane of line 6-6 of Figure 5, looking in the direction of the arrows.

Figure 7 is an exploded perspective view of a third embodiment of this invention.

Figure 8 is a cross-sectional view, partly in side elevation, taken on the vertical plane of line 88 of Figure 9, looking in the direction of the arrows.

Figure 9 is a cross-sectional view taken on the vertical plane of line 99 of Figure 8, looking in the direction of the arrows.

Figure 10 is a bottom plan view illustrated in Figures 7, 8 and 9, thereof.

Referring now more specifically to the drawings, reference numeral 29 designates, in general, one embodiment of a material stop gage constructed in accordance with the teachings of this invention. As illustrated in of the gage housing prior to the closing "ice Figures 1 to 3, inclusive, the gage 20 is seen to comprise a pair of elongated substantially

rectangular side walls

22, 24, of which the side wall 22 is provided with an outwardly turned integrally formed elongated and sub stantially rectangular flange 26 at the lower'end thereof and spaced inwardly from the forward end 28 thereof. A similar flange 30 is also formed on the lower end of the side wall 22 and is spaced inwardly from the rear end 32 thereof, the

flanges

26 and 30 being aligned each other. V

The rear end 32 of the side wall 22 is provided with a laterally inwardly extending integrally formed tab 34 adjacent to but spaced below the upper end of the side wall 22. A lip 36 is integrally formed with the upper, end of the side wall 22 and projects laterally and iii"- wardly of the gage 29, the lip being disposed intermediate the front and

rear ends

28, 32, respectively, of the side wall 22. The upper end of the front end 28 of the wall 22 terminates in a longitudinally extending substantially V-shaped projection 33 integrally formed therewith and having an upwardly inclined face 40 extending rearwardly from its apex 43.

A pair of vertically aligned tapped

openings

42, 44 extend transversely through the side wall 22 adjacent the rear end 32 thereof. A tapped opening 46 is horizontally aligned with the opening 44, and a fourth tapped opening 48 is horizontally aligned with the opening 42.

The side wall 22 is completed by forming a transversely extending dowel pin opening 50 therein adjacent the upper end thereof intermediate the ends of the wall by forming a second transversely extending dowel pin open ing 52 therein substantially intermediate the upper and lower ends thereof and intermediate the front and rear ends thereof, and by providing a longitudinally extending arcuately shaped expressed portion 54 which extends inwardly from a point adjacent the rear end 32 thereof to a terminal point intermediate the front and rear.

ends

28, 32, respectively, thereof. h

The side wall 24 is provided with three integrally formed laterally and inwardly extending

flanges

56, 58

and 60, substantially rectangular in configuration, the

flange 56 being disposed adjacent the front end 62, the flange 58 being positioned adjacent the rear end 64, and the flange 60 being located substantially intermediate the

flanges

56, 58. An outwardly and laterally extending flange 66 is positioned intermediate the

flanges

56, 60,

and a similar flange 68, also outwardly and laterally extending, is interposed intermediate the

flanges

58 and 60. As is seen in the drawings, the

flanges

56, 58 60,66 and 68 are horizontally aligned. I j

A rear end tab 70 is integrally formed with the side Wall 24 and is positioned adjacent to but slightly spaced from the flange 58. A lip 72 extends laterally inwardly from the upper end of the wall 24, and a substantially centrally positioned lip 74 also extends laterally and inwardly therefrom.

The upper end of the front end 62 of the wall 24 terminates in a longitudinally extending substantially V-s'haped projection 76. integrally formed therewith and having an upwardly inclined surface extending rearwardly from its apex 78.

A pair of vertically aligned

openings

80, 82 extend.

vided with a longitudinally extending arcuately shaped expressed portion 92 which extends inwardly from a point 7 ifng y inser'ting the lip 36 between the

lips

72, 74 for engagement withlthe inner side of the sidewall 24 and causmg the

flanges

56, 58' and 60 to abut against the adjacent'side of the wall 22. In this position the pairs of and the. sides are held releasably secured together by screws 94 which extend t hrough each of the pairs of aligned openings. V

V In this assembled position the lip overlies the tab 34 which extends over and is parallel to the tab 70, and the expressed portions 54 and 92 are longitudinally aligned in spaced confronting relation to form a guideway in which an elongated substantially cylindrical member 96 having an end closure wall 98, is mounted for reciprocation. One end of a helicoidal spring 100 engages the tab 70 while the other end thereof abuts against the closure wall 98 which, in turn, is constantly biased for engagement toward a normally vertically extending rear side 102 of an elongated polygonal plate 104. The plate 104 is provided with an elongated slot 106 which receives therethrough a dowel pin108 supported at its opposite ends in the

dowel pin openings

52, 90. The major axis of the slot 106 is normally positioned at an angle of substantially with respect to the horizontal diameter of the dowel pin 108.

The front side 1100f the plate 104 is substantially parallel to the rear side 102, and the upper end 112 is substantially perpendicular to both the front and

rear sides

110 and 102, respectively. The two inwardly converging

sides

114, 116 form an obtuse angle with the side 116 extending at an angle of substantially 45 with respect to the front and rear ends, and is normally maintained at an angle of 45 with respect to a vertical projection of the vertical diameter of the dowel 118 which engages the

sides

114, 116 adjacent the line of junction thereof and prohibits the counter-clockwise rotation of the plate 104 to reduce the described angle'of 45 As is seen in the drawings, the opposed ends of the dowel pin 118 rest in the opposed and aligned

dowel pin openings

50, 88.

The assembled gage is fixedly secured on a die shoe (not shown) by means of a pair of brackets .120 which are notched at 122 to form flanges 124 under cut at 126 for engagement over the

flanges

26, 30, 66 and 68, the brackets being mounted on the shoe by means of the screws 128.

In operation, are initially in the full line positions shown in Figure 2 of the drawings. A sheet of material 130 is fed into the die until the leading end thereof engages the faces 40, 79 formed on the inclined faces 40, 79 tend to elevate the sheet of material 130 until the same engages the front end 110 of the plate 104 die is then operated, and thereafter the pressurepad 132 movesdownwardly, and at this movement is effected, the front end 110 is moved downwardly and the plate 104 slides rearwardlyon the dowel pin 108 and pivots thereon until the corner 112A formed at the junction of the front end 110 with the upper end 112 clears the lower edge of the material 130. The upper end 112 then engages the leading end of the sheet 130 and holds the sheet motionless until the pressure pad 132 completes its downward movement at the upper surface of the sheet of material At this time, the material 130 is free to move to its next station, and the plate wardly thereunder to' maintainabutting engagement of the upper end 112 with the under side of the material 130. After thematerial 130 has cleared the, gage. 2 0, the P ate 04. pi ots 1 p.u .1 y.t9 the' u l. '4: P s i n swa the gage 20 and its associated elements the

projections

38,, 76. At this time,

104 moves upwardly and for-

V openings

42,80; 44, 82; 46, 84; and 48, 86 are aligned,

at substantially right angles thereo. The V in Figure 2 above the inturned lips 36,- 72 and 74, the 7 pressure pad 132 in the meantime, having been returned to its original position.

Referring now to the second embodiment of this invention which is illustrated in Figures 4 to 6, inclusive, it is seen that the gage designated, in general, by the reference numeral 200 comprises a substantially rectangular side wall 202 having a pair of opposed front and

rear ends

204 and 206,. respectively. 'As in the preceding embodiment, the front end of the front wall 204 terminates in a longitudinally extending'V-shaped projection 208 4 having an apex 210-and an upwardly and rearwardly inclined surface 212. A plurality of counter-bored holes 214 extendtransversely through the side wall 202 and are adapted to receive therethrough a plurality of bolts 216. r

The side wall 202 is formed with a longitudinally extending rabbet 218, the function of which will be described below. I

Additionally, the side wall 202 is formed with two transversely extending dowel

pin receiving openings

220 and 222, respectively. The inner side of the side wall 202 is provided with a longitudinally extending arcuately shaped groove 224.

The second side wall 226 of the gage 200 is substantially rectangular inconfiguration and has a pair ofopposed front and

rear ends

228 and 230, respectively. As in the construction of the 228 of the side wall 226 is provided with a longitudinally an apex 234 and an upwardly and rearwardly inclined face or surface 236. The outer side of the, side wall.

226 is provided with a longitudinally extending rabbet 238 which is positioned substantially parallel to the rabbet 218 formed in the side wall 202. A plurality of tapped openings 240 are formed in the side wall 226. and are adapted to threadedly receive the screws 216 in order to secure the two side walls together.

The side wall 226 has a notch formed therein which extends inwardly from the front end 228 and the projection 232, the notch forming a flange 242 adjacent the lower end thereof, the flange terminating in a reduced step 244 adjacent the inner'end thereof. The side wall 226 is under cut at 246 to form a top wall 248, and the side wall 226 is recessed inwardly from the lower end thereof to'form a shoulder 250 which extends upwardly to thetopwall 248. V

The side wall 226 has a longitudinally extending arcuate groove 252 which extends inwardly from the front end 228 thereof and communicates at its inner end with an arcuate groove 254 of greater extent than the groove 252. The outer end of the groove 254 terminates adjacent the rear end 230. I

The forward end of the top wall 248 is provided with an arcuately shaped recess 256 which, at its inner end, connects with the inner end of a dowel pin opening 258, and the side wall 226 is also provided with a second dowel pin opening 260. i

In its assembled form, the dowel. pin opening 222 is adapted to be coaxially aligned with the arcuately shaped When assembled, the

side walls

202, 226 are disposed in juxtaposed position, and the groove 224 complements the arcuately shaped groove 256 to form a substantially V circular guide adapted to receive, for reciprocation there in, an elongated substantially cylindrical member 266.

The cylindrical member 266 is provided with a closure wall 268 against which one end of a helicoidal spring 270 is adapted to engage. The other end of the "spring 270 t.

is adapted to engage against the end walls 272 formed in each of

theside Walls

202, 226 adjacent their respective rear ends 206, 230. The closure wall '268 is conside wall 202, the front end stantly biased for engagement against the rear end 274 of an elongated polygonal plate 276. The plate 276 is provided with an elongated slot 278, the major axis of which lies on an angle of with respect to a projection of the horizontal diameter of the dowel pin 264. The dowel pin 264 extends through the slot 278 to afford the plate 276 pivotal and sliding movement.

The polygonal, plate 276 has a front end 280 which extends substantially parallel to the rear end 274, and the upper end- 282 is disposed in a plane substantially perpendicular to both the front and

rear ends

280, 274, respectively. The side 284 is disposed at a substantially 45 angle with respect to the front and

rear ends

280, 274, and the inner end of the side 284 junctions with theinner end of the side 286 at an obtuse angle.

The dowel pin 262, supported in dowel pin opening 222, the arcuately shaped groove 252, and the dowel pin opening 258, limits the counter-clockwise movement of the plate 276 so that the angle of45", referred to above, is never lessened with respect to a projection of the vertical diameter of the pin 264.

A pair of brackets 288 are provided, one on each side of the assembled gage 200, and the brackets are under cut at 290 to provide shoulders 292 which are adapted to engage within the

grooves

218 and 238 formed in the

side walls

202, 226, respectively. The brackets 288 secure the gage 200 to the bed plate of a punch press or other similar machine, the brackets being fixedly secured as by a plurality of bolts 294 which pass through openings 296 formed therein.

A pressure pad 298 is positioned above the upper end 282 of the plate 276, and the work 300 is fed to the gage 200 in the same manner as previously described.

Inasmuch as the function of the plate 276, the pressure pad 298, and the

faces

212 and 236 are identical to the functions ascribed to their counter-parts in the preceding embodiment, it is not believed necessary to reiterate the same at this point.

The third embodiment of this invention is stamped from a one piece sheet of metal and is illustrated in Figures 7 to 10, inclusive. As illustrated therein, the gage 400 is seen to comprise a substantially U-shaped housing 402 having a pair of oppositely disposed substantially spaced and

parallel side walls

404 and 406. The upper ends of the side wall 404 are connected by a bight portion 408 which extends from the rear end of the gage 400 and terminates at a point substantially centrally thereof.

The lower end of the side wall 404 is provided with a pair of elongated substantially rectangular spaced

flanges

410, 412 which project laterally and outwardly therefrom. The lower end of the side wall 404 is also provided with a pair of

notches

414 and 416 which serve a function to be described.

The lower end of the side Wall 406 is provided with a pair of spaced

flanges

418, 420 which are bent laterally outwardly, and a pair of

flanges

422 and 424 which are bent laterally and inwardly. The

flanges

422 and 424 are provided with reduced

end portions

426 and 428, respectively, and are adapted to be received within the

notches

414 and 416 with the outer ends of the flanges 422 engaging adjacent confronting surfaces of the side wall 404.

The

side walls

404, 406 are each provided with longitudinally extending substantially arcuately shaped expressed

portions

430, 432 which, when the gage 400 is assembled, extend substantially parallel to each other in spaced confronting relationship.

The rear end of the gage 400 is provided with a closure wall 434 which is integrally formed with the side wall 404.

A pair of aligned '

dowel pin openings

436, 438 extend transversely through the

side Walls

404, 406, respectively. These dowel pin openings are adapted to receive and support therein a dowel pin 440.

A second pair of dowel pin openings442 and 444 are formed in the

side walls

404 and 406, the latter pair of dowel pin openings being aligned and receive therein the opposite ends of a dowel pin 446.

An elongated polygonal plate 448 is provided with an elongated opening .or slot 450 which is adapted to receive therein the dowel pin 446.

An elongated substantially cylindrical member 452 is mounted for reciprocation within the arcuately shaped

grooves

430, 432 and is formed with a closure member 454 at one end thereof. One end of a helicoidal spring 456 engages against the closure wall 454 while the other end thereof abuts against the closure wall 434, thus constantly biasing the cylindrical member for movement to the right as viewed in Figure 8 of the drawings. Thus the end wall 454 constantly engages against the rear side 458 of the plate 448. The rear side 458 of the plate 448 is substantially parallel to the front side 460, and both the front and rear sides are substantially perpendicular to the upper end 462 thereof.

The side 464 extends at an angle of 45 with respect to the front and rear sides of the plate 448 and at the same angle with respect to a projection of the vertical diameter of the dowel pin 446. At its inner end, the side 464 junctions with the side 466 forming an obtuse angle. The dowel pin 440, as in the preceding cases limits the counterclockwise movement of the plate 448. The major axis of the slot 450 is again critical and extends at an angle of 15 with respect to a projection of the horizontal diameter of the dowel pin 446.

Downward movement of the plate 448 is effected by the pressure pad 468 in order to release the work 470.

Brackets 472 having longitudinally extending flanges 474 are secured to the bed of a punch press (not shown) by bolts 476, the flanges 474 thereof being superimposed over the

flanges

410, 412, 418 and 420.

The operation of this gage is identical to those previously described.

Having described and illustrated three embodiments of the present invention, it will be understood that the same are offered merely by way of example, and that the invention is to be limited only by the scope of the appended claims.

What is claimed is:

l. A material stop mechanism comprising a gage having a housing formed of a single sheet of material, said housing comprising a pair of oppositely disposed spaced and substantially parallel side walls having an integrally formed bight connecting the upper ends of said side walls and extending from one end thereof to a centrally disposed point, a pin extending between and supported on said side walls forwardly of and proximate to the terminal inner end of said bight, a second pin extending between and supported on said side walls below said first pin, a polygonal plate having an elongated slot formed therein, said plate being disposed between said side walls and receiving said second pin therethrough in said slot for pivotal and longitudinal reciprocal movement relative to said side walls, a longitudinally extending arcuate groove formed in each of said side walls and disposed in confronting relation, an integrally formed end wall extending from one of said side walls across said one end thereof, a cylindrical member having a closed end disposed in said grooves for reciprocation therein, a resilient member.having an end thereof engaging against said end wall and said closed end of said cylindrical member, said closed end of said cylindrical member constantly engaging against a side of said plate to urge said plate for longitudinal and pivotal movement, said second pin being disposed in the path of movement of said plate to engage and thus limit its movement in one direction, said plate having an end thereof normally extending above the upper ends of said side walls in work engaging position, and means for securing said gage on a base.

2. A material stop mechanism as defined in claim 1,

and one ofsaid side walls having inwardly turned spaced flanges at the lower end thereof, the other of said side pair of oppositely disposed substantially parallel side walls,

means integral with at least one of said walls separating said walls in spaced relation, a pin extending between and supported on the upper edge portions of said side walls adjacent'to and spaced from said means, a second pin extending between and supported on said side walls below said first pin, a polygonal plate having an elongated slot formed therein, said plate being disposed between said side walls and receiving said second pin therethrough in said slot for pivotal and longitudinal reciprocal movement relative to said side walls, a longitudinally extending arouate groove formed in each of said side walls and disposed in confronting relation, an integrally formed end wall extending from one of said sidewalls across said one end thereof, a cylindrical memberhaving a closed end disposed in said'grooves for reciprocation therein, a resilient member having an end thereof engaging against said end wall and said closed end of said cylindrical member 'said closed end of said .cylindrical'mernbe'r constantly engag ing against aside ofsaid plate'to urge 'said plate' for 1on gitudinal and pivotal movement, said second being disposed in the path of movement of said plate -to "engage and thus limit its movement in one direction,- sa'id'plate having an end thereof normally extending above the up- 'per ends of said side walls in work engaging 'positio'n, and

means for securing said gage on a base.- 7

References Cited in the file of this'patent UNITED STATES PATENTS,

2,059,010 Melin Oct. 27 ,"19 36 2,158,466 Little May 16, 1939 2,219,060 West Oct. 22, 1940 2,589,033 Baumgartner Mar. 11, 19 52 FOREIGN PATENTS 873,234 Germany Apr. 13, 1953