US2279417A

US2279417A - Multiple punch press

Info

Publication number: US2279417A
Application number: US315978A
Authority: US
Inventors: Carlton R Stevens
Original assignee: Individual
Current assignee: Individual
Priority date: 1940-01-27
Filing date: 1940-01-27
Publication date: 1942-04-14
Anticipated expiration: 1959-04-14

Description

April 14, 1942. c. R. STEVENS MULTIPLE PUNCH PRESS 4 sheet's-sheet 1 Filed Jan. 27, 1940 l INVENToR CarltunRS/tezfens.

mm vm 0N, mow N Ill. ,EN ||||||||I m5 f@ MON. ON mm. u N Q m; wo .E ww. ...Hl Il m2 GOOQOM NNm .vw Nm o .v9 U www. @N WWU@ ,M1.1..-!-..|W m E u mmm@ m. m- ,o9 mm 4)' om Wwf mfbt .n um il!! m ATTORNEY c. R; STEVENS 2,279,417

MULTIPLE PUNoH'PREss Filed Jan. 27, v1940 4 sheets-sheet 2 April 14, 11942..

April 14, 1942.

C. R. STEVENS MULTIPLE PUNCH PRESS Filed Jan. 27. 1940 4 Sheets-Sheet 3 TWA .m I;

INVENTOR Carlton RStez/ens.

uff/9 ATTORNEY c. R; STEVENS l April 14, 1942.

` MULTIPLE PUNcH'PREss /4 vng. #/mfuv w WON lll 1x mw nwwmfm.. m www# a. .E l a mr Patented Apr. 14, 1942 UNETED STATES PATENT 12 Claims.

This invention relates to presses, and more particularly to a multiple punch press of the eyelet machine type which will be capable of eX- tremely rapid operation.

One object of this invention is to provide a multiple punch press of the above nature which` A further object is to provide a multiple punch press of the above nature having improved detachable bearing means for the punch-holding and punch-lifting plungers.

A further object is to provide a machine of the above nature having improved means to transfer the products from station to station.

A further object is to provide a machine of the above nature having an improved form of common die holder which is adjustable from the front of the machine.

A further object is to provide in a machine of this nature a unitary detachable block in which is mounted the common die holder and its adjusting means, the product transfer means, and the ejecting mechanism.

A further object is to provide a machine of i;

this nature in which the moving parts are maintained out of direct contact with the machine frame, and in which said moving parts will be readily detachable for repairs, adjustments, and replacements.

A still further object is to provide an'improved 'multiple punch press or eyelet machine of the above nature which will be relatively inexpensive to manufacture, simple in construction, ornamental in appearance, and very elcient and durable in use.

With these and other objects in view, which will appear as the description proceeds, there has been illustrated in the accompanying drawings one form in which the invention may be conveniently embodied in practice.

In the drawings:

Fig. 1 is a front assembly view of the improved multiple plunger press.

Fig. 2 is a side View of the same.

Fig. 3 is a vertical sectional view of the same, taken on the line 3 3 of Fig. 1, looking in the direction of the arrows.

Fig. 4 is a plan View on an enlarged scale lil) and partly in section of the bed of the machine, taken on the line 4 4 of Fig. 1.

Fig. 5 is a horizontal enlarged sectional view taken on the line 5 5 of Fig. 1.

Fig. 6 is a vertical enlarged sectional View taken through the die block assembly on the line 6 6 of Fig. 4.

Fig. 7 is a longitudinal vertical enlarged sectional view taken on the line 'I 'I of Fig. 4.

Fig. 8 is an enlarged transverse vertical sectional view taken on the line 8 8 of Fig. 4.

Fig. 9 is an enlarged cross-sectional view taken on the line 9 9 of Fig. 4.

Fig. 10 is an enlarged cross-sectional View taken 0n the line Ill-I0 of Fig. 4.

Fig. 11 is a Vertical sectional View of one of the punch-holding plungers taken on the line II II of Fig. 5.

Fig. 12 is a vertical sectional View of the same taken on the line I2--I2 of Fig. 11 at right-angles to the rview shown in said figure.

Fig. 13 is a sectional view of the same, taken on the line I3 I3 of Fig. 11.

Fig. 14 is a plan View on a greatly enlarged scale of a blank adapted to be stamped by the irst punch of this machine, and from which an eyelet or other article may be made.

Fig. 15 is a perspective view of an eyelet Which may be formed from the blank shown in Fig. 14

" `by the operation of the succeeding punches of I8 extending outwardly from its outer side to` the right, as viewed in Fig. 1, and in which are located suitable bearings for a vertical transfer cam shaft` 2l, said bearings being held in place by a pair of removable caps I9 and 20.

The frame side uprights II and I2 are provided near their tops with recesses 22 and 23 in which

removable bearing blocks

24 and 25, respectively, are secured, as by

bolts

25, 26. A horizontal main cam drive shaft 21 is journaled within the

bearing blocks

24 and 25, and extends beyond each of the side uprights II and I2,

The shaft 21 carries a pair of tight and

loose pulleys

28 and 29, respectively,at the left of the upright II Viewed in Fig. 1. Provision is made of a spur gear 39 and a bevel gear 3| mounted on the shaft 21 outside of the upright I2. A bevel gear 32 is mounted on and secured to the upper end of the vertical shaft 2| and is in mesh with the bevel gear 3|. Below the side arm I8 another bevel gear 33 is secured to the lower end of the vertical shaft 2| and meshes with a bevel gear 34 secured to the right-hand end of a horizontal ejector cam shaft 35 (Fig. 1), which extends beyond the upright I2 below said arm I8. The shaft 35 is journaled in a pair of

detachable bearing blocks

36 and 31 secured, as by bolts 38, in a pair of recesses 39 and 49, respectively, provided in the uprights II and I2 adjacent the base plate I9. above construction it will be seen that the vertical shaft 2|, the main drive shaft 21, and the ejector cam sh-aft 35, together with associated pulleys, gears, and other parts, may be readily removed as units from the machine frame for adjustment, repair, or replacement.

Strip feeding mechanism The eyelets (Fig. 15) formed in this machine are adapted to be blanked out from a-coil of strip metal 4| wound on a reel 42 supported on a bracket 43 (Fig. 2), said strip being fed from the reel 42 at the front of the machine to a scrap take-up reel 44 supported on a bracket 45 at the rear of the machine. The take-up reel 44 is rotated from the ejector cam shaft 35 by means of a round belt 46 which runs over a small pulley 41 secured on said shaft 35, and a large pulley 48 mounted on a short shaft 49 supported by the rear bracket 45, said belt being in friction-driving engagement with the take-up reel 44 in the usual manner.

The metal strip 4| is adapted to be advanced in timed relation with the machine operation by a pair of cooperating vertically spaced rollers 59 and I (Fig. 2) 'suitably journaled in a bracket 52 mounted on the platform I6. Intermittent feed is given to the strip 4| by means of an elevated crank disc 53, a link 54, and a pawl 55, which is adapted to engage a ratchet wheel 56 secured to the shaft 51 of the roller 5|, in the usual well-known manner. The crank disc 53 is secured to a spur gear 58 which is in mesh with the spur gear 39.

In order to maintain the gears 39 and 58 in proper mesh and take up backlash or looseness therebetween due to wear, the gear 58 is mounted on a shaft 59 (see Figs. 2 and 3) which is journaled in an eccentric bushing 69 rotatably mounted in an enlarged section of the frame side upright I2. The bushing 69 is fastened in any desired adjusted position by a set screw 6I, and is provided with an enlarged manipulating head 62 by which it may be rotated to shift the shaft 59 and with it the gear 58 toward and away from the gear 39 to adjust the mesh of their cooperating teeth.

Punch plungers A plurality of equally spaced-apart punchholding plungers 63 (in this instance six) are provided. The plungers 63 are circular in crosssection and are adapted to be verticallyr reciprocated in

alined circularholes

64 and 65 formed in a pair of vertically spaced-apart

detachable cross-bars

66 and 61. vare adapted to be removably secured to the vintermediate cross-frame members I4 and I5, re-

By means of the I'he cross-bars 66 and 61.

spectively, as by

bolts

68 and 69, respectively, located at the ends of the

bars

66 and 61. Provision is also made of two rows of intermediate bolts 19 and 1I which are disposed intermediate the adjacent plungers 63 (Fig. 1). It will be understood that since the plungers 63 and the

holes

64 and 65 are circular in cross-section, the wear in their bearings will be reduced to the minimum but may be readily taken up by adjusting the

bars

66 and 61 by means of the bolts 19 and 1I. This adjustment is made possible by providing

narrow slots

13, 13 lengthwise of each of the bars 66 and 61 (see Fig. 5), respectively, the slots 13 extending vertically through the respective bars and opening into each of the plunger-bearing

holes

64 and 65. Any wear experienced between any plunger 63 and its corresponding

hole

64 or 65 may-thus be compensated for by tightening the respective bolt 18 or 1I to force the adjacent portion of the

bar

66 or 61 tightly against the respectiveplunger. Moreover, due to the removability of the crossframe members I4 and I5, by loosening the

bolts

68 and 69, the cross-bars 66 and 61 will be easily accessible for repairs or replacement.

Punch Zifters As most clearly shown in Figs. 3 and 5, provision is made of a plurality of` equally spaced-apart punch-lifting plungers 14 (six in this instance) to correspond with the punchcarrying plungers 63 previously described. The plungers 14 are also circular in cross-,section and are adapted to be vertically reciprocated in alined circularbearing holes 15, 16 and 11 formed in vertically spaced-apart cross-bars 18, 19 and 89. The cross-bars 18, 19 and 80 are bolted, respectively, to the top frame member I3, the intermediate frame member I4, and the intermediate frame member I5 by bolts 8|, 83, and. 83 respectively (Figs. 3 and 5) at the ends of the

bars

18, 19 and 88.

Bolts

84 and 85, respectively, disposed intermediate adjacent plungers 14 in the

bars

19 and 89 are also provided to secure said bars to the respective frame members I4 and I5.. For the purpose of adjusting the

bars

19 and 88, to take up any wear which may occur between the walls of the

holes

16 and 11 and the plungers 14, the

bars

19 and 89 may be provided with slots 12 (see Fig. 5), similar to the slots 13 in the

bars

66 and 61, supra.

The corresponding pairs` of punch-holding plungers 63 and lifting plungers 14 are secured together by six horizontal kneepieces 81, respectively, 'each of which is adjustably clamped at its rear end about the plunger 14 by'a bolt 82 and secured at the front end to the punchholding plunger 63r by a bolt 88, so that the corresponding

plungers

63 and 14 willmovein unison and may be adjusted lengthwise relatively to each other. The plungers 14 are each frictionally engaged by the inner end of a plug 89 slidable in the top cross-bar 18, said plugs 89 being arranged in pairs, each pair being engaged at their outer ends by the opposite ends of a strap 98 (Figs. 1 and 3) which is pressed forwardly to force the plugs 89 inwardly against the respective pair of plungers 14 by an adjust able coil spring 9| reacting between the head of a bolt 92 screw-threaded into the cross-bar 18, and passing through the strap 99. Manual rotation of the bolt 92 will adjust the tension of the spring 9| and thus control the friction on the adjacent plungers.

Each of the punch lifting plungers 14 is, provided with a horizontal cam-engaging lifter finger 93 clamped, as by a bolt 94, about one of the plungers 14 and extending therefrom forwardly to a point above the main drive shaft 21 in position to be engaged by one of ve upstroke cams 95 on said shaft 21.

Each of the punch-holding plungers 63 has a plug 96 provided with a hardened end 91 seated in a hole 98 in the upper end of said plungers 63 in position to have its hardened end 91 engaged by one of five downstroke cams 99 on the shaft 21. The remaining right-hand finger 93 (Fig. 1) and plunger bumper head 91 at the blanking station are adapted to be similarly engaged by cams |99 and |9| respectively. The

cams

95, 99, |99, and |9| are all mounted on the shaft 21 and are keyed thereto by a common elongated key |92. The cams are adapted to be held in proper position lengthwise on the shaft 21 by means of a tapped spacing collar |03 which is adapted to force said cams to the right against an enlarged section |94 on said shaft 21.

Each plungerv head 96 is arranged to be moved lengthwise in the plunger 63 by means of a wedge member |95, to adjust the downward throw of said plunger (see Figs. 11, 12 and 13). Each wedge member |95 passes through a slot |96 formed in its plunger 63, and in so doing passes by a tongue |91 extending downwardly from the lower end of the plug 96. A set screw |98 screw-threaded through one side of each plunger 63 engages the wedge member |95 and clamps it against the tongue |91 and forces the latter against the portion of the plunger 63 opposite the screw.

Punches At the first operating station of the press, a blanking punch |99 is secured in the usual manner in the lower end of the first plunger 63 which is actuated by the cams |99 and I9| (at the right-Fig. l). The second punch ||9 forms a cup, the next two punches and ||2 elongate the shank H3 and partly form the head H4 of the eyelet (see Fig. 15), the fifth punch ||5 completes the head ||4, and the last or sixth punch 6 pierces the closed end 16a of the eyelet shank II3.

The last five punches ||9, H2, ||5 and I6 are actuated by the five pairs of

cams

95 and 99, described above.

Dies

The blanking punch |99 cooperates with a blanking die ||1 (Figs. '1 and 9) which comprises a flat plate over which the strip 4| is fed by the

feed rollers

59 and 5|. The strip 4| in passing over the die ||1 is guided by a slidable guide plate ||8 which is held in place by a one-piece metal stripper plate H9. A blank |29 (Fig. 14) is formed by the cooperation of the blanking punch |99 and die ll1, and is adapted to be carried down through said die H1 into a carrier disc or transfer block |2| which is seated in a transfer slide |22 and is positioned therein by a vertical pin |23 and a pair of horizontal threaded studs |24 and |25 (see Fig. 9).

Removable die plate holding block The five succeeding dies |26, |21, |28, |29 and |39 cooperate respectively with the punches I9, H2, |I5 and ||6, and are all made cylindrical and mounted in a one-piece common die plate |3| (see Fig. 7), each of said dies being retained therein by a horizontal friction plug |32 (see Figs. 8 and 10). Each friction plug |32 is spring-pressed against its lrespective die by a coiled spring |33 which reacts between the plug |32 and a short set screw |34 screw threaded through one side edge of the common die plate I3 I. The die plate 3| is removably mounted in a die block |35 and is adapted to be slid transversely thereof in a dovetail recess |36. The die block |35 seats at its ends upon a pair of upwardly facing shoulders |31 and |38 respectively, which are provided at the front of the side uprights and I2. 'Ihe die block 35 which eX- tends from the upright to the upright I2 is detachably secured to the machine frame by av pair of threaded bolts |39 which pass transversely throughthe die block |35 and-are screw-threaded into the horizontal platform I6. Moreover, it will be noted that the die block |35 (FigsfS, 6 and 10) has a pair of strips |3541 set into its upper: surface at each side of a longitudinal groove |51 formed therebetween above the dovetail recess |36` therein. This construction is for the purpose of facilitating the manufacture and .assembly of the machine, and it will be understood that when once in place the strips |35a will remain permanently in the die block |35.

The die holding plate |3| is normally adapted to be disposed in the dovetail recess |36 substantially intermediate the front and rear of the die block 35, and is held in operating position by a pair of spacing bars |49 and |4| (Figs. 3, 6 and 10) provided at the front and rear-of said plate |3|, said bars also being transversely removable from the die block |35.

Mechanism for adjusting common die platel As clearly shown in Fig. 6, the die plate |3| is adapted to be adjusted forwardly and rearwardly to aline the dies |26|39 with the corresponding punches by means of a pair of long horizontal screws |48 and |49, which pass through the die block |35 from the front to the rear and screwthread into a pair of vertically disposed rear fin"- gers |59. The fingers |59 are secured at their lower ends to the die block |35 by horizontal screws |51, and have screws |52 screw-threaded through their upper ends to engage the rear surface of the rear spacing bar |4I. Lock nuts |53 are provided on the respective screws |52 to hold them permanently in operating position.

Transfer mec-hanism,i

The die plate holding blockV |35 is provided with a longitudinal groove |51 upon its upper surface in which the transfer slide |22 is adapted to be reciprocated in timed relation with the machine operation to transfer the products from one cooperating set ofpunches and dies to the next succeeding set. On the first' stroke of the slide the blank |20 will be carried by the disc |2| from its punched-out position under the blanking die plate I|1 to a position under the second punch IIO to be acted upon thereby. The product formed at this second station inv cooperation with the die |26 will be engaged by the free ends of a pair of ,elongated resilient product transfer iingers |58 and I 59 which are secured at their other ends to the reciprocating transfer slide I 22, and

during each reciprocation of said slide, the prodv uct will be advanced along the die plate |3| to a position below the next succeeding or third punch III. Y

Similar cooperatingv pairs of fingers I 60 and |6I, |62 and |63, |64 and |65 will grip and transfer the products at the succeeding punches and dies |I2, |I3, |14, and |21, |28, |29 respectively (3rd, 4th and 5thI stations). The front ngers |58, |60, |62 and |64 are inclined rearwardly from the front side wall |66 of a longitudinal extending Aslot |61 formed in the top of the transfer slide |22, and the rear opposing fingers |59, I6I, |63 and |65 are inclined forwardly from the rear side wall |68 of the slot |61.

'I'he products formed by the punch and die I I6 and |30 at the last or sixth station are adapted to be blown along the longitudinal slot |61 to theleft, as viewed in Fig. 4, and allowed to fall through an oval-shaped hole |69 formed in the die block |35 and from which extends a downwardly inclined conveyer tube |10 to guide said products into a suitable container (not shown). i The scrap piercings resulting from the last station are adapted to fall through the last die |30 into an opening |1I (Fig. 10) provided in the die block |35, and are guided by a downwardly inclined tube |12 into another suitable container (not shown).

An opening |13 is formed in the die block |35 beneath the blanking punch |09 to receive a cylindrical die if the same is desired, but in the present instance, said opening is lled by a plug |14.

Erecting mechanism ers |19, |80, I8I and |82 are required to producel the eyelet I I3 (shown in Fig. 15) and said plungers are provided with suitable ejecting rods |83, |84, I 85, |85, respectively, which are adapted to extend upwardly and through the respective dies |26, |21, |28, and |29 to eject products therefrom and raise them into the path of the respective transfer fingers described above. Hardcned metallic bumper plugs |81 are located in the enlarged upper ends of each of the holes |15, |16, |11 and |18 to form seats for the respective dies I26-I30 inclusive.

The transfer slide |22 is arranged (Figs. l and 4) to be reciprocated in timed relation with the machine operation by means of a horizontal plate cam. |99 secured on the vertical shaft 2|. The cam |99 is adapted to alternately engage a pair of vertical

eccentric rollers

200 and 20| secured to an auxiliary slide bar 202 slidable on-a supporting member 203 mounted on and fastened to the side arm I8 of the upright frame I2 and the bearing cap 20 thereof by depending

bolts

204 and 205 respectively. The roller 200 (see Fig. '1) is rotatably mounted on an eccentric bushing 206 through which extends a vertical bolt 206a, which serves to fasten the bushing 206 to the bar 202. A handle arm 201 extends laterally from the bushing 206 so that the latter may be manually rotated after the bolt 206a is first loosened to effect an adjustment in the position of the center of the roller 200, and thus control the reciprocating stroke of the auxiliary slide bar 202, and through it the stroke of the transfer slide |22 to which it is detachably connected.

In order to provide a readily detachable connection between the auxiliary slide bar 202 and the transfer slide |22, provision is made of a link 208 which is secured, as by a pin 209 and screw 2I0, to the slide bar 202, and by a pin 2|| to the slide |22, respectively. By means of this con- Y struction it will be' seen that the loosening of the screw 2|0 permits the removal of the pin 2I| from the slide |22 to readily disconnect the latter from the slide bar 202.

In order to permit longitudinal adjustment of the auxiliary slide bar 202, it has dovetail edges (Fig. 2) which t into a dovetail slot 2|2 formed .in the supporting member 203, and a gib 2|3 is provided along the front edge of said slide bar 202 for use in taking up wear-said gib 2|3 `being adapted to be pressed transversely against said slide bar 202 by m'eans of three screws 2I4. Provision is also made of a stop screw 2I5 at the right-hand end of the supporting member 203 to limit the mlovement of the slide bar 202, said screw 2|5 being threaded through an end plate 2|6 secured to the end of the bearing cap 20 by screws 2I1.

Stripping mechanism Product stripping means now to be described are provided at each of the punches H0, IH, H2, H and H6, inclusive (see Fig. 7). At the punch H0 the stripping means comprises a spring-pressed pin 2|8, which is located within and extends downwardly from the punch H0 to release the product therefrom in a wellknown manner. At the last or piercing station the productl is stripped from the punch |6 by a plate 2|9 (Figs. 1, 4 and 1) which is secured to the die block |35 by screws 220 and overlies the slide |22 to close the top of the slot |61 therein at this point. The plate 2|9 insures the passage of the product toward the oval-shaped hole |69 by a blast of compressed air which is forced through holes 22| provided in a tube 222 extending transversely over the'slide |22 at this point (see Figs. 1, 5, 6 and 10). The tube 222 may be connected to a source of compressed air (not shown) by a hose 223, and is fastened to the die block |35 by a loop strap 224 and screws 225.

The product stripping means associated with each of the intermediate punches HI, H2 and H4 comprises eyelet head-forming sleeves or

thimbles

226, 221 and 228 surrounding said punches, respectively (see Fig. 7). The

sleeves

226, 221 and 228 are slidably mounted on the stem portions of the punches |H, H2 and H3, respectively, and each is held in place thereon by a iiat spring strap or stripper fork 229 (Figs. 3 and rI) which extends rearwardly to a vertical bracket 230 (Fig. 3), which is secured by screws 23| to the rear surface of the platform I6. The straps 229, as they extend forwardly, pass under a horizontal bar 232 secured to the underside of the intermediate frame member |5, which bar carries a plurality of adjusting screws 233 (one for each strap 229), extending downwardly therefrom for engaging said strap 229 to adjustably limit the upward movement. thereof. The straps 229 are bifurcated at their forward ends 234 to straddle annular grooves 235 formed on the

thimbles

226, 221 and 228. At the eX- treme forward ends of the straps 229, provision is made of inclined arms 236 (Figs. 1 and 3) secured to the cross-bar 61 by the bolts 1|, and extending downwardly from the bar 61 to engage the bifurcated ends 234 of the straps 229 and act as stops while the work is being released from the punches |H, H2 and H5.

Friction brake for transfer slide At the left-hand end of the machine (Figs. 1, 4, and 6) a horizontal bracket 231 (Figs. 1, 4 and '1) extends across the die block |35 above the transfer slide |22, and is secured to the die block 35 by bolts 238. A friction pad 239 (Fig. '1) engaged by a pair of rods 240 connected to- Ygether by a strap 24| is pressed downwardly by a screw 242, screw-threaded into the bracket 231, and said pad 239 is adapted to engage the slide |22 to formi a drag and prevent sudden movement thereof. An intermediate bracket 243 (Figs. 1, 4, 8 and 9) formed integral with the blanking punch stripper plate H9, is secured to the die block |35 by bolts 244. A friction pad 245, similar to the pad 239, is provided under the bracket 243 and is adapted to be pressed down against the transfer slide |22 by a pair of rods 246 (Fig. 9) connected together by a strap 241, and which is engaged by a screw 248 screwthreaded into the bracket 243.

Operation. The operation of the present invention is in most respects similar to that of the standard eyelet or multiple plunger presses now on the market. The drive shaft 21 is rotated continuously through a belt, not shown, from any suitable source of power by means of the tight pulley 28. The drive shaft 21 rotates the punch and lifter cams secured thereto to reciprocate the punches toward and away from the dies. Through the spur gears 30 and 58 the crank disc 53 is rotated to actuate the

strip feeding rollers

Among the advantages of the present invention may be mentioned the detachable bearing blocks 24 and 25 which permit the removal as a unit of the shaft 21, spur gear 30, bevel gear 3|, andthe punch-actuating cams on the shaft 21. Moreover, the auxiliary slide bar 202, the vertical shaft 2|, the cam |99, the bevel gears 32 and 33, and the

rollers

200 and 20| may also be removed, as a unit, by first detaching the

bolts

204 and 205, the bearing caps I9 and 20, the screw 2|8, and the connecting link 208.

A further advantage is that the die block |35 and all of its associated parts may be readily removed, as a unit, by the simple operation of first loosening the bolts |39 and disconnecting the screw 2|0. The unit so removed comprises the die block |35, the die plate |3|, the slide ,|22, the stripper plate H9, the carrier disc |2| and transfer ngers on the slide |22, and the ejector plungers and rods and associated parts mounted on the die block |35. This construction greatly facilitates the making of changeovers, repairs, adjustments and replacements. Moreover, should it be desired to merely remove the common die plate |3| and the dies held therein as a unit, the screws |46 only will be loosened and the lugs |44 and |45 may be swung downwardly out of the way.

Another important advantage of the present invention is that all moving parts are arranged for ready removal for replacement, repair, or adjustment. Moreover, being light in weight, though sturdy in construction, the improved machine may be operated at a relatively high speed without excessive wear upon its moving parts or the bearings therefor. Being relatively simple in construction, a machine of the above nature will be comparatively inexpensive to manufacture and operate.

While there has been disclosed in this specication one form -in which the invention may be embodied, it is to be understood that this form is shown for the purpose of illustration only, and that the invention is not to be limited to the specific disclosure, but may be modified and embodied in various other forms without `departing from its spirit. In short, the invention includes all the modifications and `embodiments coming within the scope of the following claims.

Having thus fully described the invention, what is claimed as new and for which it is desired to secure Letters Patent is:

1. In a punch press, a reciprocable punchholding plunger, a cam-engaging bumper plug in said plunger, means to axially adjust said plug relatively to said plunger including a wedge slidable transversely through said plunger,'said plug Vhaving a tongue extension at its lower end for engaging between said wedge and the inner surface of said plunger, and a screw threaded into said plunger and adapted to engage said wedge and press it against said tongue to prevent twisting of said bumper plug.

2. `In a multiple punch press, an upright frame provided with a pair of vertically spaced forwardly opening recesses, a plurality of upright reciprocable plungers of circular cross section, a pair of vertically spaced one piece bearing bars for. said plungers, each of said bars having a plurality of circular holes therethrough providing complete sliding bearings for the plungers independent of the frame, means to detachably secure said bars to the frame, said bars being longitudinally slotted between .the holes therein with the slots running into the holes, and;

means located between said holes to press the portionsu of the bars on opposite sides of the slots toward the rplungers, to compensate for wear.

3. I n a multiple punch press, an upright frame, a plurality of aligned dies, a common die4 plate for detachably receivingall of said dies, means to hold each of said dies in said plate, a die block detachably secured to said frame and provided with a transversely extending guide slot to slidingly receive said die plate, and adjusting means mounted on the block and operable at the front-of the block `to Yshift said plate both rearwardly and forwardly in the slot to adjust the position of the dies.

4. In a multiple punch press, an upright frame, a plurality of aligned dies, a common die plate for detachably receiving all of said dies, means to hold each of said dies in said plate, a die block detachably secured to said frame and provided with a transversely extending guide slot to .f

said plate rearwardly in the groove, a movableV member mounted at the rear of the block adapted to shift the plate forwardly, and an adjusting screw connected with said member to operate it to shift the plate and extending through the block to the frontthereof for operation at the front of the block. Y Y

5. In a multiple punch press, an upright frame, an upright reciprocable plunger, a die block mounted in the frame having a transversely extending guide, a die plate mounted to slide in said guide, a diemounted in said plate under the plunger, a screw mounted at the front of the block and operable to shift the platerrearwardly, an adjustable member mounted on the rear of the block and operable to shift the plate forwardly, an adjusting screwlmounted in the block and having threaded connection with said adjustable member, and said screw extending4 to the front of the block and adapted for manipulation at the front thereof to shift the plate. Y

6. In a multiple punch press, an upright frame provided with upwardly facing shoulders, a plurality of aligned dies, a common die plate in which said dies are removably seated, means to hold said dies in the plate, a die block mounted on said shoulders, means to detachablyv secure the block to the frame, said block beingprovided with a transverse guide slot to slidingly receive said die plate, means operable at the front of the block to transversely adjust said die platein said die block, a work transfer slide mounted on` said die block above said die plate and vdies to transfer articles from. one die to another,` means to reciprocate said transfer slide, and work ejecting means mounted inand carried bythe die block below the die .plate to shift articles from the dies into the transfer slide, said die plate, transfer slide,and. work ejecting means being so mounted on the block as to be removable with the block from the frame as a unit. Y

7. Ina multiple punch press, an upright frame provided with upwardly facing shoulders, a die block mountedV onv said shoulders, meansyfor detachably securing the block to the frame, a series of dies mounted in the block, means for transversely adjusting the dies in the block, a work transfer means mounted on the die block above the dies for movement to transfer articles from @one die to another, and work ejecting means mountedr in and carried by the die block below theldies independent ofl theframe to shift articles from the dies to the transfer means, and said dies, transfer means and ejecting means being so mounted on the die block as to be removable from the frame with said block as a unit.

, 8. In a multiple punch press, an Vupright frame 4provided with upwardly facing shoulders, a die `block mounted 4on said shoulders, means to detachably-,secure the block to the frame, a plurality of aligned dievmounted in the block, a transfer slide mounted onrthe die block above said dies to transfer articles from one die to another, means to reciprocate saidslide, andarticle ejecting means mounted in and carried by the die block below the dies to ,shift articles ,from the dies linto the transfer slide, and said ejector means being mounted in the die block independentlyof the frame so that the block, dies, transfer slide and ejector means are removable from the frame asa unit.

9. In a multiple punch press,f an upright frame provided with vertically spacedV forwardly facing recesses and upwardly facing shoulders below the recesses, a pair of bearing bars detachably mounted in said recesses and each provided with a plurality of bearingsj-independentof the frame, a plurality of cam driven punch plungers mounted to reciprocate in saidy bearings, a die block detachably mounted on said shoulders, a plurality of dies' mounted on said block below the plungers, and a plurality of cam operated ejectors mounted inxsaid 'block below the dies to eject work Apieces, from the dies, and said ejec- 4torsl being mounted in the block independent of the frame and removable from the frame with the block as a unit.

10. In a punch press, an upright frame having aforwardly facing recess and upwardly facing shoulders, a one piece bearing bar detachably mounted-in said recess and provided with a plurality of bearings independent ofthe frame, a plurality of upright cam-driven punch plungers mounted to reciprocate in said bearings, a die block detachably mounted on said shoulders, a

plurality of dies mounted in the block-under the plungers to cooperate therewith, a transfer slide mounted on saidL block above the dies and reciprocable to transfer articles from one die to another, and article ejecting means mounted in the block below the diesA to shift articles from the dies to the transfer dslide, and said` ejecting means being mounted in the block independent of the frame and removable With the block.

11. In a multiple punch press, a frame including laterally spaced upright side members connected by a plurality of vertically spaced horizontal frame members extending between them, a pair of journal bars detachably mounted on the front of a pair of said horizontal frame members and each provided With a series of bearings independent of the frame, a plurality of upright punch carrying plungers mounted to reciprocate in said bearings, a plurality of rear journal bars detachably mounted on the rear sides of the horizontal frame members and each provided with a plurality of bearings independent of the frame, a plurality of upright lifter rods mounted to reciprocate in said latter bearings, knee pieces connecting the lifter rods with the plungers for operating them, shaft bearings detachably mounted in the frame, a shaft mounted in said bearings, and two sets of alternate cams mounted on the shaft for operating said lifter rods and plungers. l

12. In a multiple punch press, a frame including laterally spaced upright side members connected by vertically spaced horizontal frame members, a pair of front bearing bars detachably mounted on the front of said horizontal bars and each provided with a plurality of circular bearings therein independent of the frame, a plurality of circular plungers mounted to reciprocate in said bearings, a plurality of rear bearing bars detachably mounted on the rear sides of said horizontal frame members and each provided with a plurality of circular bearings independent of the frame, a plurality of circular lifter rods mounted to reciprocate in said latter bearings, and knee pieces connecting each lifter rod with a plunger to operate it and provided with clamps to clamp the rods and plungers and prevent the plungers from turning in their bearings.

CARLTON R. STEVENS.