US2213451A - Punch press - Google Patents

Description

Sept. 3, 1940. F. E. MuNsCHAUl-:R ET Al. v 2,213,451

PUNCH PRESS Filed Oct. 30, 1959 3 Sheets-Sheet l si .fa 14' 75 75 /7 ,Z4 79 60 4/ 5.745 17 36 5/ v 52 52 a m 55 n I# g: al: l-f ,L7/'- HI l: :y il 7@A 59 U 35 v 5; 66 6" --l\`-/l ATTORN EYS Sept. 3, l940 F. E. MuNscHAUER Er AL PUNCH PRESS 3 Sheets-Sheet 2 Filed Oct. 30, 1939 ENToR INV U Sept. 3, 1940.

PUNCH PRESS Filed Oct. 30, 1939 3v Sheets-Sheet 3 F. E. MuNscHAuER E-r AL 2,213,451A

Patented Sept. 3, 1940 rUNcH PRESS y Frederick E. Munschauer and George E. Munschauer, Buffalo, N. Y., assignors to Niagara Machine and IlFool Works, Buffalo, N. Y.

Application October 30, 1939, Serial No. 301,965

15 Claims.

mission means and other movable elements ordi narily associated with presses of this class. The novel punch press of our invention has a frame element for performing functions corresponding to those of press frames in the prior art but we have so arranged the component stress members of this element as to materially increase the structural efficiency ofthe frame element and consequently of the punch press with which it is associated. f

In our present invention the stress members of the punch press frame are so shaped and arranged that the external loads and forces which may be applied within safe practical limits of deflection and internal stress of the frame element are very much higher than is the case with press frames of prior art presses of comparable size,

weight and die capacity. The structural effiay ciency of the punch press frame which forms a part of our invention is in large part attributable to the novel arrangement of transmission means from the point where kinetic energy is delivered to the press to the actual point of application in the reciprocation or manipulation of a punch or die or the like.

The novel arrangement of transmission means alluded to effect the operation of our punch press First, it permits the beneficially in two ways. highly eicient arrangement of structural elements of the punch press frame, as set forth above; and second, it results in the application of external loads to the press frame in such manner as to minimize their resultant moments. It is to be borne in mind of course that allv of the external forces applied to the press frame are through the medium of the several elements of the transmission means, using that term in its broadest significance, and usually at points on the press frame where the elements of the transmission means have bearing.

A further substantial advantage in the punch press constructions herein disclosed resides in the greatly increased safety which results from .designs which present a minimum of exposed moving parts.` sion elements save the driving pulley, which may be associated with a driving motor or a line shaft, and the actual die supporting slide itself, are completely housed and protected, both from themselves doing harm and from being harmed or impaired by outside agencies.

An advantage which accompanies such housing of` the transmission means resides in the fact that adequate lubrication of the several moving parts may be conveniently and readily effectedV and' special arrangement of the transmission means in the structural frame element is pro- Substantially all of the transmis-y vided for the purpose of still furtherv facilitating 4 and insuring the provision of adequate lubrication of all parts which are sub-ject to wear.

'In the provision of a punch press possessing the advantages and desirabilities recited in the foregoing, numerous problems havev been encountered in previous attempts to achieve the objects of the present invention. In our improved punch press, exemplary embodiments of which are shown in the accompanying drawings and described in the ensuing specification, these problems have been disposed of in a manner which reconciles the frequently conflicting in-l terests' of facility and economy of manufacture, convenience in use, long machine life, and the utmost in vsafety both to the machine itself and to the operator or operators.

In the drawings: i Fig. 1 is a vertical .cross sectional side elevational view of one form of the machine of our invention; l i

Fig. 2 is a'front elevational view thereof with portions of the upper part of the machine frame broken away; y

Fig. 3 is a fragmentary cross sectional view taken on the line III-III of Fig. l and showing the crank shaft detent mechanism in detail;

Fig. 4 is a fragmentary sectional viewsimilar to Fig. 1 but showing the upper portion only of a modified form of the invention; and i Fig. 5 is a fragmentary rear elevational view of a casing mountingl portion of the machine of Fig. 4. u g

In the drawings like characters of reference denote like parts and the numeral l@ designates soA1 generallythe main frame member of the punch rear portion of the bed II. The spaced columns are for the purpose of supporting a superstruc- .ture which carries the principal moving parts of the punch press and which is of novel conformation and arrangement in the present invention.

The form of the columns I2 andl I3 and the manner of their association with the bed II is not directly a part of the inventive concept embodied in the punch press set forth in this application and it is to be understood that the details of the machine in this particular may be varied to satisfy various considerations of design and use. In the form illustrated the columns I2 and I3 are of hollow rectangular cross section with their depths or major cross sectional axes extending rearwardly from the rear edge of the bed II. The columns I2 and I3 are, as illus,- trated in Fig. 1, curved forwardly-'at their lower portions so that they come up beneath and merge with the bed II and support the latter. The spaced column arrangement is desirable because it permits work pieces and scrap to be passed therebetween, usually after the work piece or scrap has been operated upon by a die supported upon the bed I I and has passedtherethrough.

The columns I2 and I3 support, at their upper ends, a casing portion I5 and the interior of the casing portion I5 has a partition I6 which divides the casing into upper and lower chambers. The upper chamber, designated Il, is arranged to house transmission means for operation of the press in a manner which will hereinafter appear and the partition I6 serves the added purpose of `reinforcing and stiffening the upper portion of the frame I0. l

Various means for supporting the frame I0 upon a suitable foundation may be employed. If, as is frequently the case in presses of the class under consideration, it be desired that the press be inclinable to and from an erect or vertical position the supports 20 andy 2l illustrated in the drawings may be provided. In such case pivot means connect the main frame Ill and the supports 20 and 2| at a point beneath the bed I I of the press. Such pivot means may comprise a pair of axially aligned pivot pins 22 and 23' which pass through the supports 2l) and 2I, respectively, and are secured in the forwardly extending portions of the columns I2 and I3.

Mechanism for moving the frame IB about the pivot pins 2E and 23 from a vertical position to various rearwardly inclined positions is conventionally provided and it is not believed necessary to an understanding ofthe principles of the present invention that such means be illustrated. One form of press inclining means may be found in Letters Patent to Frederick Orton, Numbered 2,106,917 and dated February 1, 1938. For relatively bracing the main frame I0 and the supports 2U and 2i with respect to each other arcuate slots 2li struck from vthe pivot pins 22 andv23 are formed in the supports 2i! and 2|. A nut and bolt'assembly 28? is associated with each of the slots 2li and an aligned opening formed in the lower portion of each of columns I2 and I3. r

At the outside of the front face of the casing portion I5, and usually adjacent the lower portion thereof, there is provided a pair of integrally formed and laterally spaced projections 21 and 2B for receiving a pair of adjustab-ly and removably associated gibs .2&3 and 39 which are adapted to retain and guide a slide member or ram 3l for vertical reciprocation aga-inst the front of the casing l5. The slide member 3| is provided with suitable means for securely engaging the upper or movable element of a die. rIhe adjustable and removable gib construction and the details of the slide are conventional and well known and since such details do not directly and specically form a part of the present invento be supported jointly in the front wall of the casing I5 and in a portion of the projection 34.

The projection 313 comprises a hollow casing having a top wall Si?, side walls St and llt, a front wall fil, and a bottom wall d2. The rear wall of the hollow casing which comprises the projection 34 is identical with an upper portion 154 of the front wall of the casing I5. rhe bottom wall i2 of the projection 35 is provided with an approximately central upwardly directed formation 4@ which provides a recess Il in such bottorn wall adapted to receive and provide clearance for the crank portion of a crank shaft. The Ywalls of the upward formation @6 are spaced at all points from the interior of the top, side, front and rear walls which form the outer casing of the projection 34 so that, considering the projection 31% as a cantilever beam with upward bending loads occasioned by the forces against the crank shaft,` spaced but rigidly constrained tension and compression members are provided.`

While the various portions of the frame have been shown as substantially closed hollow box sections, it will be clear that suitable provision must be made for supporting and removing cores in the course of casting the frame. This is preierably accomplished by locating core prints at points which coincide with relatively little stressed portions of the frame structure, such portions lying close to the neutral nbre of the frame, considering the various cross sections thereof as beam sections. ri'he holes left by the core prints may, after removal of the cores, be permanently closed by welding plates in or over the openings, which would be the case in the press illustrated in the drawings, or the holes may be closed by removable plates or even left open. In any event the disposition of the holes is such as not to materially lessen the strength of Lthe frame.

Adjacent the bottom of the projection 34 and at opposite sides of `the recess lll, front and rear,

`are the bearings iid'and 36, respectively, previously referred to. It will be noted from an inspection of Fig. l that each of the bearings 35 and 36 is of substantial length and is supported and directly backed at each of its ends by either an inner or an outer wallportion of the projection 34. It will further be noted that each such backing wall portion extends directly vertically to the point where it merges with one of the spaced -top wall portions and the structural eiiciency of the arrangement and disposition of these elements and the rigidity thereby afforded will be apparent.

The front bearing 35 includes a cylindrical bearing block 50 which is removably associated with the lower forward portion of the projection 34. This end may be accomplished by providing an arcuate or circular opening or recess in the projection 34. The cylindrical bearing block may conveniently be held against accidental removal by screws 52 which pass through an annular flange 53 formed on the cylindrical bearing block and engage in the projection 34. This construction of the front bearing 35 permits ready removal or assembly of the bearing block in the process of erecting or dismantling a punch press.

A crank shaft 55 for effecting reciprocation of the slide 3l has journal portions 5l and 58 which are supported in the b- earings 35 and 35, respectively, and intermediate such journal portions the crank shaft is provided with a .crank 59, the crank pin of which engages rotatably with one end of a connecting member or pitman 58.

The other end of the connecting member 50 is engaged with the slide 3l by means of a ball and socket joint designated generally 8l and which permits the connecting member E0 to incline freely with respect to the slide 3l as the opposite end of the connecting member is caused to revolve with the crank pin.

The details of the connecting member and of its connection with the crank 59 and the slide Si, respectively, are not new excepting in that the plane of rotation of the crank 55 is at right angles to the usual plane of rotation of cranks in presses of the general class comprehended in the present invention and consequently the axis of the crank shaft runs from front to rear of the machine generally and of the slide in particular.

Referring now to the means for rotating the v crank shaft 55 and for controlling its rotation, special attention is directed to Fig. l where the crank shaft is shown extending rearwardly into the interior of the casing portion l5 for engagement with and by suitable transmission means which are arranged and disposed in a novel manner. In addition to the bearings 35 and 36 the crank shaft is provided with a rear bearing 63 formed in a removable cover member 65 which is disposed over an opening provided in the rear wall of the casing l5. For smoother and more nearly frictionless operation a ball bearing 55 or the like may be provided in association with the bearings 63 and the rear journal portion of the crank shaft 55.

A ywheel 66 is rotatably disposed on the crank shaft intermediate the bearings 36 and 63 and the flywheel may have gear teeth formed thereon, as in the illustrated embodiment, and thereby constitute an element in the means for transmitting rotary motion to the crank shaft 55. The flywheel is supported for rotation on the crank shaft 55 by means of a pair of ball bearings 58 and E9 and the right hand ball bearing 59, as viewed in Fig. l is held against axial displacement by reason of the provision, at its left side, of a collar or sleeve 'I8 which is disposed about the crank shaft 55 and between the ball bearing 59 and a shoulder formed by a reduction in diameter of the crank shaft 55.

At its other side the ball bearing 59 is in abutment with the hub of a cam 1| which is provided for a purpose which will hereinafter appear and the hub of the cam extends to the ball bearingv 55 which mounts the rear end of the crank shaft 55. The ball bearing 55 is held against axial displacement by a nut i2 which engages the threaded end of the shaft 55 and urges the bearing 55 against another shoulder formed by a still further reduction in the diameter of the crank shaft 55 at this point.

A countershaft 'l5 is provided for imparting rotative motion to the crank shaft 55 through engagement between a pinion 16 carried by the countershaft l5 and the gear teeth formed on the flywheel 65. The flywheel is adapted to be selectively and intermittently connected to the crank shaft 55 for transmitting its rotative movement to the latter in a manner which will presently appear. The countershaft 'I5 is supported by means of bearings 'i8 and 19 which may be formed integrally with the frame member il] and the latter of which is associated with the rear wall of the casing portion l5 of the frame member.

Ball bearings are preferably provided in conjunction with the bearings 18 and 'I9 for more efficient operation as indicated in Fig. 1 of the drawings. It will be noted that in the illustrated embodiment a portion of the countershaft projects rearwardly through rear bearing 19 and through a cap which is provided for the purpose of retaining the ball bearing and consequently the countershaft itself in propery axial position.

This rearward projection of the countershaft 'l5 is provided for the purpose of supporting a drive pulley 8| which may be connected with means for imparting rotative movement thereto by belts 82. Such motive means may constitute a line shaft or, as in the illustrated instance, an individual motor drive including an electric motor 83 disposed at the outside of the frame of the press l0 vand secured thereto by a pivot 84 and a screw connection 85, Vthe latter being adjustable to regulate the tension of the belts 82.

From the previous description it will be apparent that the flywheel 55 is mounted for normally free rotation with respect to the crank shaft 55, but suitable mechanism is provided for selectively establishing driving engagement between the flywheel-and the crank shaft. Such mechanism is provided, in the illustrated embodiment, in the form of a jaw clutch which is similar in form and arrangement tov clutches well known in the art, save with respect to its arrangement and disposition with relation to the remaining elements of the present new combination.

One clutch element 88 is secured against the flywheel 56 as by the screws or studs 89 and has on its outer radial face spaced radially extending clutch teeth for cooperation with the teeth of a complementary clutch element 9U. The latter element is slidable axially with respect to the crank shaft 55 but has a spline or feather key connection therewith for causing joint rotation of the clutch element 90 and the crank shaft. A conventional spring, which does not appear in the drawings, is provided for normally urging the clutch element 9i! into clutching engagement with the clutch 89. With the clutch p-arts in the position illustrated in Fig. 1 the clutch elements 89 and 98 are relatively disengaged by virtue of the engagement of a clutch pin 92 with at camming shoulder 93 formed on the clutch element The clutch mechanism is of the single revolution type and the pin 92 is connected in a conventional manner with manual operating means for withdrawing the pin radially away from the clutch element Si) and out of engagement with the shoulder 93 against the resistance of a spring which tends to urge the pin toward the axis of the clutch element. When the pin 92 is momentarily withdrawn from its engagement with the shoulder 93 by operation of the,- manual means the clutch element 90 is moved into engagement with the clutch element 89 and joint revolution of the flywheel and the crank shaft ensues.

If the manualoperating means is released before a predetermined portion of a single revolution is completed the pin 92 is moved, by means of the spring previously referred to, toward the axis of the crank shaft and to the position it occupies in Fig. 1, whereupon subsequent rotation of the clutch element 90 brings the shoulder 93 and the pin 92 into camming engagement and the clutch element 90 is cammed axially to the left and out of clutching engagement with the element 89, the position in which the parts are shown in Fig. 1.

The stopping of the crank shaft in a predetermined angular position upon interruption of clutching engagement is assured b-y means which will now be described. Having reference particularly to Fig. 3, the cam '|I previously mentioned is xed to the crank shaft E5 by a key connection. A cam follower or roller 95 is rotatably supported by one end of a lever 96 whose opposite end engages about a spring pin 91 and the lever 9B is pivotally secured to a portion of the stationary frame member of the punch press intermediate its ends and by means of a pivot pin 98.

The spring pin 97 also has pivotal support against the frame member as by means of the pivot pin 99 and the pivot pins 98 and 99 may conveniently be associated with the rear wall of the casing portion l5 of the frame of the press. The engagement of the end of the lever 96 about the spring pin 9T is such as to permit pivotal movement of the lever about its fulcrum and a coil spring it surrounds the pin 91 below the lever St. The coil spring |09 is compressed between the under side of the end of the lever 96 and a nut lill by means of which the initial tension or" the spring may be selectively adjusted. A locking nut |02 is also preferably provided.

The cam means thus provided is arranged to cooperate with the clutching means to effect stopping of the crank shaft and the parts driven thereby in a predetermined phase of their cycle of movement and at the same time serve to modify the distribution of the several loads throughout the operating cycle so that the available torque may be more efliciently applied and utilized. To this end the cam` 'H is formed so that its outline is generally that of an eccentric circle with a lower and somewhat more abrupt inwardly curving portion at the point where the eccentric outline most nearly approaches the axis of rotation of the cam. In actual practice the general outline of the cam 1| is not truly that of an eccentric circle but the contour may be so classified here for the purpose of describing its relation to the present invention.

In the illustration of Fig. 3 the cam follower 95 is shown in engagement with thie latter inwardly curving portion and as the -several parts approach the illustrated position toward the conclusion of a cycle of rotation, and with the clutch already disengaged, a resilient but sufliciently positive tendency to detain the cam and its related parts in the position illustrated is exerted by reason of the spring |60.

Apart from this local tendency of the cam to be retained in a predetermined position with the follower disposed in engagment with the inwardly curving portion, the general e'ccentricity of the cam outline is such that during approximately half of the revolution of the crank shaft the follower is moved away from the axis of the cam and through the medium of the lever 96 the spring is compressed by such movement in a manner which will be clear from an inspection of Fig. 3. This loading of the spring IBB is arranged to takeA place when the crank of the crank shaft, the slide, the connection between the crank and the slide, and the punch secured to the slide, are all moving downward and the spring loading thus tends to absorb and neutralize the kinetic energy released by those elements in their downward movement. Conversely, the remaining portion of the cam outline is such that the cam follower has a return movement toward the axis of the cam during which time the spring |00 is unloaded and the kinetic energy previously stored in the spring serves to assist in lifting the weight of the parts previously recited as they are moved upwardly.

Referring to Fig. 1, it will be noted that the partition i6 which forms the bottom wall of the chamber Il which houses the transmission means is formed to provide a sump adjacent the lower portion of the flywheel gear 5% whereby the moving parts of the transmission means may be adequately lubricated by filling such sump to a suflicient level so that the lower portion of the flywheel runs in the lubricant. Lubricant entrained by the flywheel is lifted and a portion thereof iiows over the closely adjacent clutch mechanism at one side of the flywheel and the detent and counterbalance mechanism at the other side of the flywheel. A slightly inclined groove |86 is formed in the bottom wall of the sump |95 and leads to a drain plug lill at one side of the frame of the press, as may be seen from Fig. 2, for the purpose of draining the sump |55 when desired.

Reference will now be had to the modified form of press illustrated in Figs. 4 and 5 and to avoid needless repetition, the modification of Figs. 4 and 5 will be discussed with 'reference to the manner in which it differs from the construction of Figs. 1, 2 and 3, it being understoodl that all details not specically mentioned are to be as nearly the same as corresponding details in the iirst-described embodiment as conditions permit. Speaking generally, the main distinguishing feature of the embodiment of Figs. 4 and 5 resides in the fact that a separate casing portion |39 is provided for housing the portion of the transmission means which acts between and serves to connect the drive pulley i3! with the crank shaft |32. Certain advantages are secured by thus providing a transmission housing which is formed separate from the main frame of the press, which in Figs. 4 and 5 is designated generally |33. By forming the casing portion |36 separately the machining of the several bearings and other finished surfaces thereof is substantially facilitated since those operations can in that way be accomplished on a smaller machine than if such casing portion were formed integrally with the main frame of the machine as in the embodiments of Figs. 1 through 3. From the standpoint of economy of production this is an important consideration and the attainment of the general objects of the present invention by using a separate transmission housing for cooperation with the main frame of the machine represents a highly satisfactory alternative mode of carrying out the principles of the invention which form the subject of this application.

75; connection with the slide to reciprocate the f With further reference to Fig. 4, a pulley shaft 35 is journaled in the casing E38, one bearing therefor being disposed in the rear wall of the casing 'itil and another being provided inside the casing and preferably formed integrally therewith as at E36, A pinion l3ll onthe pulley shaft 35 meshes with a gear i738 which is rotatably disposed upon the crank shaft 13G. For effecting rotation of the crank shaft with the gear i3d, clutch mechanism indicated generally at ifi-i3 is provided. Since such clutch mechanism may be the same as that illustrated in connection with the inst-described modication no further description thereof is necessary, save to state that the stationary portions there of are secured to the front wall of the. casing member i3@ and securing screws therefor are indicated at lill in Fig. 5, which is a cross sectional view looking at the inside of the front wall of the casing member i3@ from the rear of the machine.

Counterbalancing and detent mechanism is associated with the rear end of the crank shaft 132 as in the previously described embodiment, and such mechanism is indicated by the numeral |132 in Fig. 5. v l

The main portion of the press frame |33 is formed similarly to the press frame lli of Figs. 1 through 3 with the exception of the fact that upper rear portion for housing the transmission means is omitted and what constituted the partition dfi or the previous embodiment is, in the present modification, the rear Wall lll/3 of the press frame. Such rear wall M4 is located a greater distance back from the crank of the crank shaft than in the former case to give ample strength to the frame and to aiford, at this point, a beam of'ample depth for resisting and absorbing the bending moments which are applied to the press frame in this region. Such greater' depth of the frame H33 at this'point dictates the use of a longer medial bearing M5 for the crankshaft which actually results in a very rigid and vibrationless crank shaft and bearing construction. l f

The transmission casing I3@ is provided with a sumpportion M6 for containing a lubricant supply for Vthe same purpose as in the construction of Figs. l through 3. The rear wall ldli of the frame member E33 and the front wall of the casing machined pads Ml and M8 respectively and screws M9, see Fig. 5, serve to keep thesevpads in abutment and the frame 33 and the casing |31) in assembled relation.

While specific embodiments of' the principles of our invention have been shown in the draw-` ings and described herein, it is to be understood that the invention is not limited thereto or otherwise than as defined in the appendedl claims.

We claim:

1. In a punch press, a frame member comward extension at its front wall and above said` slide, a bearing element provided at the forward portion of said extension and an aligned bearing element spaced rearwardly of the rst'bea'ring element, a crank shaft `iournaled in saidy bearings and having a crank therebetween for i3@ are provided with complementary latter, said crank shaft having a portion thereof extending rearwardly into the vinterior ofv the hollow casing portion, bearing means associated with said frame member for supporting the rear terminal portion of the crank shaft, a countershaft journaled in said casing portion, a flywheel on said crank shaft within said casing portion and means for transmitting rotary motion from ing bed disposed below said slide and a forward extension at its front wall and above said slide, a crank shaft journaled in said forward extension and extending rearwardly into theinterior of said casing portion, said crank shaft having a crank for connection with the slide to reciprocate the latter, bearing means associated with said frame member for supporting the rear terminal portion of the crank shaft, a flywheel rotatably mounted upon said crank shaft between said forward extension and saidY bearing means and within saidv casing portion, a clutch element secured tosaid ywheel' and a cooperating clutch element fixed for rotation with said crank shaft and movable axially to and from engagement with said rst clutch element, `a cam fixed for rotation with said crankshaft and disposed adjacent said flywheel, and a follower and resilient means for urging said follower against said cam, said cam being arranged in timed relation with respect to said clutch elementsk and having rises and falls ar, ranged to load and unload said resilient means as the several bodily moving elements of the punch press move downwardly and upwardly respectively to counterbalance said bodily moving elements. v

3. In a punch press, a frame member comprising a hollow casing portion, a reciprocable slide and means at lthe outside of the front wall of the casing portion for supporting and guiding the same, said frame member having a die-receiving bed disposed below said slide and a forward extensionat its front wall and above said slide, a crank shaft journaled in said forward extension and extending rearwardly into the interior of said casing portion, said crank shaft having a crank for connection with said slide to reciprocate the latter, bearing means associated with said frame member for supporting the rear terminal portion of the crank shaft, a flywheel rotatably mounted upon said crank shaft intermediate said forward extension and said bearing means and within said casing portion, a clutch element secured to the forward face of said flywheel and a cooperating clutch element i'lxed for rotation with said crank shaft and movable axially to and from clutching engagement with said rst clutch ele-3 ment, a cam xed for rotation with said crankshaft and disposed thereon rearwardly of said flywheel, a follower for said cam, and resilient means supported 'upon the rear wall of said'casing portion and acting between said stationary casing portion and said follower to urge the latter` into engagement with the cam vpath of said cam, said cam being arranged in tirned relation with respect to said clutch elements and having rises andfalls arranged to load and unload said resilient means as the slide and a movable portion 75 BOL of a die normally carried thereby move downwardly and upwardly respectively to counterbalof the casing portion for supporting and guiding the same, said frame member having a die-receiv ing bed disposed below said slide and a forward extension at its front wall and abo-ve said slide, a crank shaft journaled in said forward extension and extending rearwardly into the interior of said casing portion, said crank shaft having a crank for connection with said slide to reciprocate the latter, bearing means associated with said frame member for supporting the rear terminal portion of the crank shaft, a flywheel rotatably mounted upon said crank shaft intermediate said forward extension and said bearing means and within said casing portion, a clutch element secured to the forward face of said flywheel and a cooperating clutch element xed for rotation with said crank shaft and movable axially to and from clutching engagement with said first clutch element, a cam fixed for rotation with said crank shaft and disposed thereon rearwardly of said iiywheel, a follower for said cam, and resilient means supported upon the rear wall of said casing portion and acting between said stationary casing portion and said follower to urge the latter intoengagement with the cam path of said cam, said cam being arranged in timed relation with respect to said clutch elements and having rises and falls arranged to load and unload said resilient means as the slide and a movable portion of a die normally carried thereby move downwardly and upwardly respectively to counterbalance said do-Wnwardly and upwardly moving elements, said cam having in its outline a detent depression whereby the cam follower, under the urge of the resilient means, is adapted to ride into said depression after said clutch elements have been disengaged vto accurately determine the angular relation of the crank shaft at the end of an operating cycle.

5. In a punch press, a frame member comprising a hollow casing portion,` a reciprocable slide and means at the outside of the front wall of the casing portion for supporting and guiding the same, said frame member having a die-receiving bed disposed below said slide, a crank shaft journaled in the front and rear walls of said hollow casing portion and having a crank outside Of said casing at the front thereof for connection with said slide to reciprocate the same, a flywheel disposed upon said crank shaft within said hollow casing portion and means within said casing' portion and associated with said crank shaft for controlling the rotation thereof, said hollow casing portion having a bottom wall and a sump formed in said bottom wall and disposed about a lower portion of said flywheel, whereby rotation of said iiywheel entrains lubricant provided in said sump for lubrication of the rotation controlling means.

6. In a punch press, a frame member comprising a hollow casing portion, a reciprocable slide and means at the outside of the front wall of the casing portion for supporting and guiding the same, said frame member having a die-receiving bed disposed below said slide, a crank shaft journaled in the front and rear walls of said hollow casing portion and having a crank outside of said casing at the front thereof for connection vwith said slide to reciprocate the same, a iiywheel lcasing portion having a bottom wall and a sump formed in said bottom wall and disposed about a lower portion of said flywheel, 'whereby rotation of said flywheel entrains lubricant provided in said sump for lubrication of the rotation controlling means, said hollow casing portion being sealed against egress of the lubricant contained and circulating therein.

7. In a punch press, a frame member comprising a hollow casing portion, a reciprocable slide and means at the outside of the front wall of the casing portion for supporting and guiding the same, said frame member having a die-receiving bed disposed below said slide, a crank shaft jourrnaled in the front and rear walls of said hollow casing portion and having a crank outside of said casing at the front thereof for connection With said slide to reciprocate the same, a flywheel disposed upon said crank shaft within said hollow casing portion, and means within said casing portion and associated with said crank shaft for controlling the rotation thereof, said means comprising a positive mechanical clutch for effecting driving connection and disconnection between said iiywheel and said crank shaft and mechanical detent means synchronized therewith and operative to resiliently arrest movement of said crank shaft after disconnection is effected b-y said clutch and at a predetermined phase of its angular cycle of movement.

8. In a punch press, a frame member comprising a hollow casing portion, areciprocable slide and means at the outside of the front wall of the casing portion for supporting and guiding the same, said frame member having a die-receiving bed disposedbelow said slide, a crank shaft journaled in the front and rear walls of said hollow casing portion and having a crank outside of said casing at the front thereof for connection with said slide to reciprocate the same, a flywheel disposed upon said crank shaft within said hollow' casing portion and means within said casing portion and associated with said crank shaft for controlling the rotation thereof, said means comprising a positive mechanical clutch for effecting driving connection and disconnection between said flywheel and said crank shaft and mechani- Cal detent means synchronized therewith and operative to resiliently arrest movement of said crank shaft after disconnection is effected by said clutch and at a predetermined phase in its angular cycle of movement, said casing portion having a bottom wall, and a sump formed in said bottom Wall and disposed about a lower portion of said flywheel, whereby rotation of said flywheel entrains lubricant provided in said sump for lubrication of the rotation controlling means.

9. In a punch press, a frame member compris-l ing a hollow casing portion, a reciprocable slide and means at the outside of the front wall of the casing portion for supporting and guiding the same, said frame member having a die-receiving bed disposed below said slide, a crank shaft journaled-in the front and rear walls of said hollow casing portion and having a crank outside of said casing at the front thereof for connection with said slide to reciprocate the same, a ywheel disposed upon said crank shaft within said hollow casing portion and meansI within said casing portion and associated with said crank shaft for controlling the rotation thereof, said means comprising a positive mechanical clutch for effecting driving connection and disconnection between said flywheel and said crank shaft and disposed adjacent said flywheel at one side thereof, said means also comprising mechanical detent means synchronized with said clutch and disposed adjacent said flywheel at the opposite side thereof for resiliently arresting movement of said crank shaft after disconnection of said clutch is effected and at a predetermined phase in the angular cycle of movement of said crank shaft, said casing portion having a bottom wall, and a sump formed in said bottom wall and disposed about a lower portion of said flywheel, whereby rotation of said flywheel entrains lubricant provided in said sump for lubrication of the clutch and detent means lying on opposite sides of said flywheel 10. In a punch press, a frame member comprising a hollow casing portion, a reciprocable slide and means at the outside of the front wall of the casing portion for supporting and guiding thel same, said frame member having a die-receiving bed disposed below said slide, a crank shaft journaled in the front and rear walls of said hollow casing portion and having a crank outside of said casing at the front thereof for connection with said slide to reciprocate the same, a flywheel disposed upon said crank shaft within said hollow casing portion, and means within said casing portion and associated with said crank shaft for controlling the rotation thereof, said means comprising a positive mechanical clutch for effecting driving connection and disconnection between said flywheel and said crank shaft and disposed adjacent said flywheel at one side thereof, said means also comprising mechanical detent means synchronized with said clutch and disposed adjacent said ywheel at the opposite side thereof for resiliently arresting movement of said crank shaft after disconnection of said clutch is effected and at a predetermined phase in the angular cycle of movement of said crank shaft.

l1. In a punch press, a frame member comprising a hollow casing portion, a reciprocable slide and means at the outside of the front wall of the casing portion for supporting and guiding the same, said frame member having a die-receiving bed disposed below said slide, a crank shaft journaled in the front and rear walls of said hollow casing portion and having a crank outside of said casing at the front thereof for connection with said slide to reciprocate the same, a flywheel disposed upon said crank shaft within said hollow casing portion, and means within said casing portion and associated with said crank shaft for controlling the rotation thereof, said means comprising a positive mechanical clutch disposed forwardly of said flywheel for effecting driving connection and disconnection between said flywheel and said crank shaft, said means also comprising a mechanical detent disposed rearwardly of said ywheel for arresting movement of said crank shaft, said detent including a cam fixed for rotation with said crank shaft and resilient means supported by the rear wall of said casing portion and acting against said cam to resiliently detain said cam and said crank shaft in a predetermined position after clutch disconnection.

l2. In a punch press, frame means including a hollow casing portion, a reciprocable slide and means at the outside of the front wall of the frame means for supporting and guiding the same, said frame means having a die-receiving bed disposed below said slide and a forward eX- tension at its front wall and above said slide, a

bearing elementprovided at the forward portion of said extension and an aligned bearing element spaced rearwardly ofthe first bearing element, a crank shaft journaled in said bearings and having a crank therebetween for connection with the slide to reciprocate the latter, said crank shaft having a portion thereof extending rearwardly into the interior of the hollow casing portion, bearing means associated with said hollow casing portion for supporting the rear terminal portion of the crank shaft, a countershaft journaled in said casing portion, a flywheel on said crank shaft within said c'asing portion and means for transmitting rotary motion from said countershaft to said flywheel, and means adjacent said flywheel for selectively engaging and disengaging said flywheel and said crank shaft fo-r joint and relative rotation respectively.

13. In a punch press, frame means including a hollow casing portion, a reciprocable slide and means at the outside of the front wall of the frame means for supporting and guiding the same, said frame means having a die-receiving bed disposed below said slide, a crank shaft journaled in said hollow casing portion and having a crank portion disposed forwardly of said casing portion for connection with said slide to reciprocate the same, a fiywheel disposed upon said crank shaft within said casing portion and means within said casing portion and associated with said crank shaft for controlling the rotation thereof, said hollow casing portion having a bottom wall and a sump formed in said bottom wall and disposed about a lower portion of said flywheel, whereby rotation of said ywheel entrains lubricant provided in said sump forl lubrication of the rotation controlling means.

14. In a punch press, frame means including a hollow casing portion, a reciproc'able slide and means at the outside of the front wall of the frame means for supporting and guiding the same, said frame means having a die-receiving bed disposed below said slide, a crank shaft journaled in said hollow casing portion and having a crank portion disposed forwardly of said casing portion for connection with said slide to reciprocate the same, a flywheel disposed upon said crank shaft within said casing portion and means within said casing portion and associated with said crank shaft for controlling the rotation thereof, said means comprising a positive mechanical clutch for effectingv driving connection and disconnection between said flywheel and said crank shaft and mechanical detent means synchronized therewith and operative to resiliently arrest movement of said crank shaft after disconnection is effected by said clutch and at a predetermined phase of its angular cycle of movement.

l5. In a punch press, a main frame member and a hollow casing portion associated therewith and disposed to the rear of the upper portion of sid frame member, a reciprocable slide and means at the outside of the front wall of the frame member for supporting and guiding the same,I said frame member having a die-receiving bed disposed below said slide and a forward eX- tension at its front wall and above said slide, a bearing element provided at the forward portion of said extension and an aligned bearing element spaced rearwardly ofthe first bearing element, a crank shaft journaled in said bearings and having a crank therebetween for connection with the slide to reciprocate the latter, said crank shaft having a portion thereof extending rearwardly into the interior of the hollow casing portion, bearing means associated with the rear Wall of the casing portion for supporting the rear ter'- minal portion of the crank shaft, a countershaft journaled in said casing portion, a flywheel on said crank shaft within said casing portion and means for transmitting rotary motion from said countershaft to said ywheel, and means adjacent said ywheel for selectively engaging said ywheel and said crank shaft for joint and relative rotation respectively.

FREDERICK E. MUNSCHAUER. GEORGE E. MUNSCHAUER.

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