US2561826A - Rotary lath punch drive - Google Patents

Description

July 24, 1951 v E. SKILLMAN 2 ROTARY LATH PUNCH DRIVE Filed Feb. 28, 1950 4 Sheets-Sheet l I -1. IN V EN TOR.

Zak/App 637W July 24, 1951 Filed Feb. 28, 1950 E. SKILLMAN ROTARY LATH PUNCH DRIVE 4 Sheets-Sheet 2 July 24, 1951 v E. SKILLMAN ROTARY LATH PUNCH DRIVE 4 Sheets-Sheet 5 Filed Feb. 28, 1950 INVEN TOR.

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S /Mala? ATTOFNEPI July 24, 1951 v E. SKILLMAN 2,561,826

ROTARY LATH PUNCH DRIVE Filed Feb. 28, 1950 4 Sheets-Sheet 4 INVENTOR. Elva/Ayn Sxmv,

Patented July 24, 1951 ROTARY LATH PUNCH DRIVE Edward Skillman, Enterprise, Kans., assignor to The J. B.. Ehrsam & Sons Manufacturing 00., Enterprise, Kans., a corporation of Kansas Application February 28, 1950, Serial No. 146,769 r The present invention relates to a rotary lath punch, and is particularly concerned with the ham provement of certain details of structure, and a resultant improvement in operation, of previously known machines for accomplishing substantially the same basic function. That basic function, of course, is the production of multiple perforations in plaster lath flowing continuously, at uni" form lineal velocity, from a board forming machine, by means of rotary punch and die assemblies. The conditions under which the work must be performed are substantially those described in the patent to Emmet D. Benham and John R. Rosenleaf No. 2,228,162, issued January '7, 1941, and the particular punch and die arrangement preferably used in the present machine will be substantially that disclosed in the patent to William J. Ehrsam No. 2,182,744, issued December 5, 1939.

A machine of the character here under con-- sideration is primarily intended to perforate plaster lath, or other material moving through a machine in a continuous stream at a constant lineal velocity, by means of punches moving through the material upon lines normal to the plane of movement of the material, said punches concurrently moving with the material in the line of its flow and at its own velocity, while obviating the necessity of either starting and stop ping the material how or providing for reciprocation, in the line of material flow, of a carriage supporting the punching mechanism. Otherwise stated, such a machine must include punching mechanism, comprising cooperating elements moving continuously about separate closed orbits, but cooperating with a stream of material, moving uniformly in a single plane between those orbits, the punching mechanism being so operated as to penetrate the flowing material upon lines normal to the plane of movement of such material, while synchronizing the punching mechanism with the flowing material throughout the period ofengagement of the punching mechanism with such material.

It is the primary object of the present invention to provide improved means for controlling the attitudes of gangs of punches and gangs of cooperating dies, arranged in separate series, during revolution of those gangs about separate axes, in such a fashion that, as each gang of punches approaches, passes through, and departs from a plane common to those'axes, amating gang of dies will similarly approach, pass through, and depart from that plane, in registry with the punching gang, and with the punches 17 Claims. (01. 74-25) and the die axes precisely aligned and normal to the plane of flow of the material moving betweenthe two gangs. It is a further object of the invention to provide such improved means which will so control the attitudes of the gangs of punches and dies that each gang will be inverted as it passes through the remaining portion of its orbit.

A further object of the invention is to provide, for each such gang of punches and for each such gang of dies, a follower arm of improved construction, all of such follower arms for the punch gangs cooperating with a single cam and all of such follower arms for the die gangs cooperating with another single cam, the follower arm construction being such as to provide for extremely delicate adjustment of the attitude assumed by its associated gang to correspond with any spe cific location of the follower arm relative to its cam. A further object of the invention is to provide improved means, in association with each such sang for resiliently holding its follower arm in cooperative association with its cam.

Still further objects of the invention will appear as the description proceeds.

To the accomplishment of the above and related objects, my invention may be embodied in in the form illustrated in the accompanying drawings, attention being called to the fact, how-l ever, that the drawings are illustrative only, and that change may be made in the specific: construction illustrated and described, so long as the scope of the appended claims is not violated.

Fig. 1 is a vertical sectional view through a fragment at one end of a machine constructed in accordance with the present invention;

Fig. 2 is a similar view of a fragment at the opposite end of such machine;

Fig. 3 is an end elevation, taken upon a reduced scale, and showing that portion of the machine illustrated in Fig. 1, parts being broken away for clarity of illustration;

Fig. 4 is a similar elevation of that part of the machine illustrated in Fig. 2, parts being broken away for clarity of illustration;

Fig. 5 is a sectional view taken substantially on the line 5-5 of Fig. 2;

Fig. 6 is a similar view taken substantially on the line 66 of Fig. 2;

Fig. '7 is a perspective view, taken upon an enlarged scale, and showing the details of construction of a follower arm;

-Fig. 8 is a broken perspective view, likewise drawn to an enlarged scale, and showing the a it of Whatever nature, and to various pressing procedures, and the 1ike.-

Green plaster board is delivered, from a board forming machine, at a relativelyfhigh,constant,

lineal velocity In accordance with the present invention, it is led between the two rotors of the machine illustrated herein, .and :asrit :passes (between those rotors, punch and die sets, arran ed in series or gangs, cooperate with the moving stream of material to form, at spaced intervals, transverse lines of transversely spaced perforations,'b y severing from the green plasterboard slugs of material whcse-sizea-nd shape will bede- 'termined by the punch and-die sets-used. The construction is-such-that the severed slugs of-material will usually be driven downwardly "completely -through the dies, to drop from the lower ends of said dies; but the die sets are ginverted, during eachcye'le of operation,-so that-suchslugs may occasionally drop awayfrom the "dies "in the opposite direction during such-inversion thereof.

Referring more particularly to the drawings, it will be seen that I have illustrated amachine comprising a frame upon which-is journalled a power input shaft 2|- which may "carry :a sprocket 22 -throug-h =w-hich the machine may be chain driven from any suitable'outside source "of power. Within a suitable housing upon the frame, the shaft 2i carries an elliptical ;-gear 23 meshing-with a mating elliptical-gear 25-upon-a second shaft 2'4 *journalled in the "machine 'frame upon an axis parallel with the axis of the shaft :21. The reason for the use of elliptical gearsand the particular design of such gears, will appear as the description proceeds.

The shaft 24 further carries apinion 261meshing with -a much larger spur gear 21 on a shaft 28 whose opposite ends are journajlled respectively in the .opposite'end members of the frame 20,

bearings, such as 29, preferablybeing providedfor supporting said shaft ends in end panel-members such as 30.

Each endpanele ll is provided, in a region above the bearings 29, with avertica-lly extendingtrackupper end of each shoe 32 issuitably secured a rod 35, threaded at its upper, end, as at 36, for cooperation with a nut 3-1 (Figs. 1 and 2) journa'll-ed for rotation, but held against reciprocation, in a suitable-support on the frame panel 36. *Fixed 'to, or integral with, each nut 31, is a beveled gear 3'8, and a shaft 39 spans the region between said gears 38 and carries two beveled gears 40, each meshing with one of said gears 3'3. Two handwheels 4|, one at eachend of the machine, are mounted upon the shaft 39' for rotating the same; and it will be obvious that rotation of the shaft 39 in one direction or the other will elevate or depress the shoes 32, correspondingly shifting the shaft 34 which is journalled in said shoes, while a l maintaining parallelism of said shaft with the shaft 28.

Two spiders, 42 and 43, are mounted at opposite ends of the shaft 28, each of said spiders being formed, at peripherally spaced points upon a common circle concentric with the shaft 28, with a plurality of openings 44 for the reception 41f .theshaftsections or .trnnnions 45 .carried at :opposite'ends'of carriages 4'B. Each carriage 45 comprises a bolster 41 (Fig. 6) to the outer suruface of which is suitably secured a plate 48 proportioned and designed to receive a plurality of hollow-idles 49, each die registering with a passage 50 extending through the bolster 41. Any .suitablemeans (notshown) may be provided for removablysecuring' the dies 49 in the plate 48.

At one end of each carriage 46, the trunnion 45 is pro vided with -an-extension 5| (Figs. 2 and 7) upnn which is carried a follower arm indicated generally by the reference numeral 52 and adapted to cooperate with a cam track 53 defined on a "camplateFB l. Such a cam ,plate'is "illustrated in detail in Fig. 6, and may preferably comprise mating "sections5'4a and 54b suitably secured together 'by bolts 1'55 or-other equivalent fastening means, and providcd with cooperating, outstanding walls 56;and*51 which,- when the sections are qperatively connected, registerto define the continuous cam trackway 53.

Each-follower arm 52 (Fig. 7) comprises a hub Tiliflxed ;to its trunnion extension 5| -loy meansof a key 591and 'setscrewfill, and having an arm *fi-l substantially radially projecting therefrom. At

its'free end, the arm -6| is bifurcated to define spaced furcationsBZ and 63. A screw t4 threadedly penetrates the 'furcation 63 and carries a locknutfifi; and a similar screw -56 is similarly associated with .thetfurcation52. A lever *6! is provided atone end with a hub68 freely journalled on the hub 58; and is further provided at its oppoSiteendwith a further hub 69 in which a journal pinln is fixed by means of a 'setscrew'll. At its end'remote-from the carriage 46, the pin Til mounts a-cam-following roller 12 adapted 'to be received in the trackway 53 between the walls 56 and 51.

"The hub 69 projects axiallyto overlap the-free end of the arm BI, and is provided with a radially-inwardly-extending abutment finger T3 which, when the parts are assembled, lies between the arm furcations 62 and 63 with its opposite faces positioned for engagement,,respectivelxby-thefacing ends of the screws 64 and'BE. ,Itwill be obvious that, by adjustment of said screws, the position of the roller -'l2 relative to its carriage 416, and so the position or attitude assumedby such carriage to correspond to anypredetermined position of theroller 12 in the'tracliway 53, may be very nicely and delicately adjusted. Headed bolts 15, passing through arcuate'slots '14 in the arm 61' and threadedly engaged in the lever 61, hold said lever against axial movement away from the arm SI, and may, if it is deemed desirable, be tightened to "assist in holding said lever in any selected position of rotational adjustment relative to the arm.

, As-is most clearly to be seen in Fig. 2, the cam plate '54 is suitably supported upon an end panel 30 at that end of the machine remote from the gears '23 and 25; and, in its region adjacent the shaft 34, 'it is provided with a section, indicated by the reference numerallfi in Fig. 5, in which the median line 11 of the trackway 53 lies in a circular are, extending from a point It to a point 19, cast about a point 80., The point lies in the horizontalplane including the axis 8| of the shaft 28, and in a plane, parallel with the plane common to the axes of the shafts 28 and 34, and spaced therefrom by a distance equal to the distance betweenthe axis of the trunnion extension 5| and the axis of the pin of any follower arm. The radius of the are 16 is equal to the radius of the orbit of the trunnions or shafts 45.

The cam plate sections Ma and Mb are joined in the plane common to the axis 8! and the point 00 being provided with sections forming a hub 82 coaxial with the shaft 28, the cam track 53 surrounding said shaft axis. The plate 54 is provided with a plurality of arcuately elongated slots penetrated by screws 83 threadedly engaging the panel 30.

At a suitable point in its perimeter, the plate 54 carries a tongue 80 radially arranged with respect to the hub and the panel 30 carries a bracket 85 provided with parallel projecting fingers 86 and ill in which, respectively, are mounted screws 06 and 8S projecting into engagement with thetongue 0d. Adjustment of the screws 38 and 89 will, of course, result in very delicate and accurate adjustment of the cam plate 50 about the axisof the shaft 28.

The parts are so arranged that, as each carriage 45 approaches the plane common to the axes of the shaft 23 and M, its follower arm roller I2 will enter the cam trackway section 76; and that section, designed in the manner above described, will hold the roller 12 in such a posi tion, relative to the shaft axis of that carriage that, as the carriage approaches, passes through, and departs from the said plane common to the axes of the shafts 28 and M, the surface of its bolster 4! will be held in a truly horizontal position.

As the roller l2, moving in a clockwise direction as viewed in Fig. 5, passes the point 19, it begins to move downwardly more slowly than does its associated shaft 05, so that the bolster will be tilted in a clockwise direction and will assurne the position indicated at A in Fig. 6. From that position, the bolster will be moved to the positon indicated at B; and as the bolster again approaches the above-mentioned plane, in the region remote from the shaft 3 it assumes a fully inverted position as indicated at 0. Any refuse which may have been deposited on the plate d3 will, of course, fall away from the bolster by gravity as the bolster passes through these positions; and since, at the position C, the carriage is inverted, slugs of material driven through the ports es of the carriage which is currently in active position, will fall upon the radially inward portion of the carriage which is in position 0, rather than upon the active surface of its plate 43.

Thence, the carriage moves to position D and then to position E in which it is closely approaching the horizontal attitude which it will retain as its roller 12 traverses the section I0 of the cam trackway.

Adjustment of the cam plate through the medium of the screws 88 and 09 and the tongue 84 permits accurate location of the cam trackway section Iii relative to the path of the carriages carried on the shaft 3 Adjustment of the screws M and til (Fig. '7) makes possible absolutely accurate and uniform response, in the attitude of each carriage, to the cam trackway section it as the roller of that carriage traverses that section.

At its opposite end, each carriage trunnion 45 is '6 provided with spring by the reference numeral 90 (Figs. 1 and 8) applying to the carriage a turning force resiliently holding its roller I2 in cooperative engagement with the wall 50 of the cam trackway 53.

At this end, each trunnion i5 is formed with a reduced section 9i defining an outwardly facing shoulder 92. This section of the trunnion is internally threaded as at 94 to receive a reduced threaded end 95 of a stud 90 whose opposite end is formed with a threaded socket for the reception of a clamping bolt 51. A ring 90 is removably secured to the outer face of the spider 42 by suitable means such as screws 90, and supports a ball or roller bearing I00, whose outer race is received in the ring 08 and. whose inner race snug- 1y embraces the reduced section 0| of the trunnion 45 to support the same. The stud 95 00- operates with the inner race of the bearing I 00 to clamp the same against the shoulder 02.

An annular disc IOI is suitably secured to the ring 08 as by screws I02, or the like, and. said disc is provided, at spaced points about its peripheral region, with a series of axially projecting teeth I03.

An annular housing member MM is provided with an axially extending peripheral flange I05, and is adapted to be secured to the above-de= scribed parts, for rotational adjustment relative thereto, by means of the bolt 07, a washer I00 preferably being interposed therebetween. At spaced points about its free edge, the flange I05 is provided with a series of notches Q06 for co operative interengagement with the teeth I03 of the disc It".

A coiled spring I09 is housed within the chamber defined by the elements HM and IM, one end III) of said spring being anchored upon the element I04, for instance, by projecting through a radial slot III in the flange I05. The other end H2 of the spring I09 is anchored upon the stud 90, and while such anchorage may take any desired form, I have shown a preferred means comprising a pin or rivet H3 received in a punched hole in the spring end and carried upon a key-like element IM axially slidably movable, to a limited degree, within a keyway H5 formed in the periphery of the stud 96. This arrangement, while providing a solid anchorage preventing relative rotational movement between the trunnion 45 and the spring end Iitl, nevertheless permits limited relative axial movement therebetween to prevent any jamming which might otherwise occur during variations in the tension of the spring I09.

It will be obvious that, upon loosening the screw 91 to permit the elementv lli i to be backed away slightly from the stud es, thereby disengaging the teeth I03 from the notches its, the element I04 may be rotated in a clockwise direction, as by means of a wrench taking into two or more of the holes I01 formed in a peripheral series, to tighten the spring I09. So long as the teeth 33 and notches I00 are interengaged, there can be no relative rotation between the elements I04 and IOI. While tensioned, of course, the spring I09 will exert a turning force upon the shaft or trunnion 45 tending to rotate the same in a clockwise direction, as viewed in Fig. 8 and in Fig. 5, to hold the roller 12 in engagement with the wall 50 of the cam trackway 53.

Simi1arly,the shaft 34 carries spiders IIBand I I1 (Figs. 1 and 2) adjacent its opposite ends, said I spiders being formed with peripheral series of openings for the journal mounting of trunnions means indicated generally be arranged atthe bottom of the continuous trackway, so that all carriages II9 will be held in horizontal position as they pass through the lower section of' their orbit. At the. opposite end of. the machine, each trunnion has associated.

therewitha spring device I Min all respects identical withthe spring devices 96 hereinabove described..- Each carriage IIIS comprises. a bolster I25. upon which is suitably carried a plate I26 supporting a series of punches. I21 for. cooperation. with the dies 3; and a stripper. plate I28 may preferably be associated with said. punches.

Preferably, each. carriage 46 is provided adjacent each end with one or more heavy pins I29- perpendioular to the surface of its bolster I; and each carriage H9 is provided at its opposite ends; with corresponding, sleeves I33- located. on

axes perpendicular to the surface of. the bolster I25. As is indicated near. the center of. eachof Figs. 11 and 2, the pins: I29. of. each carriage 46-Wil1 snugly nestin the sleeve I30- of its mating carriage I-I.9-- during the actual punching operation. Since all of the carriages are resiliently held. in their cam-dictated attitudes, any slight misadjustm'entof follower arm will be corrected, during the punching phase, by the engagementof thepins I29 inthe sleeves I30.

At its endremote from the gear 21; the. shaft 28- carries a large spur gear I3I.- (Figs. 2 and 4);. and at its corresponding, end, the shaft 34- Similarly carries a similar gear I32 which when the.

parts are in the positions of Figs. 3 and 4, meshes.

with the gear I3! to provide. a driving connection between the shafts 28 and 34 whereby said shafts will be turned at equal velocitiesin. opposite directions. The gear I3I is suitably fixed to. the. shaft 28, while the gear I32 is loosely mounted uponthe shaft 3 3,. the driving connection between the gear- I32 and such: shaft 34 being provided by the:

device now to be described. Projecting from oneface of the gear I 32 is a 111g I33 adapted to'be pos-itioned between a pair of spaced. ears I34. and I35 on a hub element I33 keyed. on the shaft 34. The ear. I34. mounts an adjusting screw I31- and: the ear I35 mounts a similar adjusting screw I38.v

Said screws I31 and I38 are turned up against.

the opposite faces of the lug I33 to providea fixed driving connection between the hub element I36: and the gear I32; and itwill be clear that theangula-r relation between the shaft 34 and the gear I32 can be very delicately adjusted by opposite. adjustment of the screws I31 and I33.v By means:

of such adjustment, precise and accurate regis-. try between the carriages 43' and the carriages I-- I9 can be attained and maintained.

It is essential, under certain conditions,. that the shaft 34 be raised to an extent sufficient to. prevent coactionbetween. the punches I21 and the dies 49. It islikewise essentialthattherotorsbe maintained always in accurate registry... Sinceelevation of. the shaft 3&- tea degree sufilci ent to prevent such coaction will inevitably disen gage the meshing teeth of the gears I 3t and I32, some means must be provided for. maintaining that. registry during such disengagement. Likewise,."I have provided means for positivelylimiting downward movement of. the shaft ,34, in order that the gears I31 and I3? may not become jammed; Such limiting means preferably comprises a screw I39 (Figs. 2 and 3-) adjustably reoeivedin a cooperating socket in the lower edge; of the shoe 32, a lock nut It on said screw for" holding the screw in any desired position; of adjustment, and a fixed abutment HI I, rigid with the machine, frame, and engageable by the sorew I39, upon downward movement of the shoe, to

limit such downward movement.

A link I42 has one end jo'urnall'ed on 9. modes.- tion of the shaft 34, the othe'r'end of said link supporting an axle I43 upon which is fixed a spur gear I44. The link length is such as to hold thegear I44 always in mesh with the gear I321 A frame I45, which. may comprise merely a pair of. straps, engages the axle I43 and another axle I43 upon which is mounted a gear I41 whose pitch diameter is identical with that of the gear link I 48 being such as to hold the gear I41 always in mesh withthe gear I13 I. As shown, I provide two links I48, one engaging each end' of the axle I46. A trunnion element I5Il' is supported in the. frame panel 33 and provides. a journal mounting for one end of a link. I49',,the other; end of said link. I 33 being engaged with the axle. I43. The axis of the trunnion element I50 lies. in the plane. defined. by theaxes of the shafts 28' and 34', and the trunnion element I53 is spaced above the fixed axis. of. the shaft 28 a distance equal to the distance. between the axes of. thev axles. I43 and I46, so that the links I48 and I49 are always parallel.

The cam plate I23 is mounted, like the cam plate- 54, for rotationaladjustment about the axis of the shaft 34. In Figs. 1 and 9,1 have shown a member I5I formed to. provide spaced. parallel arms I52 and. I53 between which projects a tongue I54 similar to the tongue 8d,.screws I55: and [56; 1

threadedly carried by said arms I52 and I53, en-

gaging opposite facesof said tongue I54 to provide directly engaged withthe work material throughout a period during which the carriages 46 and H3 move. through an angular distance of some twenty-five or thirty degrees, corresponding to the. cam. track section It. Since the carriages are moving inan arcuate path. while. the work material is. moving, rectilinearly, it. will be obvious that the absolute velocity either of the work or of. the carriage must be varied" during; that period of engagement, in order to main.- tain. s-ynchronism between the punches andthe work. Since board-making. machinery ordinarily delivers the green plaster board at a constant. lineal. velocity, I have provided for varying the angular velocity of the two rotors during the periods of engagement of the punches with the material in order to.- maintain desired synchronism. As has been stated, the entire machine herein described is. driven, from the shaft El, through the. elliptical gears 23 and 25. Those gears are so proportioned and designed that, While the. shaft 2| rotates at. a constant. angular Velocity, the velocity of the shafts 28" and 34 will be continuously varied. As a punch I21 approaches contact'with the flowing stream of 5 work material, and from that. point the pointof deepest penetration is reached, the angular velocity of the shafts 28 and 34 will be I gradually decreased; and, from the point of deepest engagement to the point at whichthe punches, leave the work material, the angular velocity of such shaft will be gradually increased, the rate of Variation in the angular velocity being such as to maintain constant lineal velocity of the carriages in the direction of flow of the worlr material throughout the period of engagement of the punches with. the work material. The gear 26 (Fig. 3) hasa pitch diameter, in the illustrated embodiment of the invention, equalto one-sixth of the pitch diameter of the gear 27, and each rotor is provided with six peripherally-spaced carriages. Thus the shafts 2| and 2d and the elliptical gears '23 and 25 make one complete revolution while moving each carriage 45 through its active cycle.

I claim as my invention:

1. In a device of the class described, a pair of rotors, means mounting said rotors for rotation associated cam means, said follower arms, being of equal effective lengths, each cam means including a circular arcuate section acting upon eachfollower arm successively to hold the associated carriage with its work support normal to a plane joining said rotor axes as such carriage' traverses such plane between said rotor axes during rotation of said rotors, and each cam means including other sections acting upon each follower arm successively to invert the associated carriage as such carriage travels through the section of its path remote from the other rotor, and means correlating said rotors to cause a carriage of one series to traverse said lplane always simultaneously with, and in cooperative registry with, a carriage of the other series.

2. The device of claim 1 in which each cam means comprises an endless traokway defined by a pair of parallel, mutually facing walls, and a roller carried adjacent the end of each follower arm remote from its carriage and confined between said walls.

3. The device of claim 2 including resilient means operatively connected to each carriage and applying thereto a turning force about the axis of such carriage resiliently urging its associated roller toward one of said walls.

1. The device of claim 1 in which each follower arrn comprises an element fixed to its carriage and projecting substantially radially away from the axis of said carriage, a second element mounted for oscillation about said axis andprojecting substantially radially away from said axis, cooperating means on said first and second elements for shifting said second element angularly about said axis relative to said first element, and means engageable with said cam means carried by said second element at a point remote from said axis.

5. The device of claim 4 including spring 'stantially radially therefrom,

lever in any selected inwardly projecting abutment on means operatively. connected with each carriage and with its rotor, said spring means applying a turning force to its carriage about the axis thereof resiliently urging said last-named means into coactive engagement with its cam means.

6. The device of claim 1 including spring means operatively connected with each carriage and with its rotor, said spring means applying a turning force to its carriage about the axis thereof resiliently urging its follower arm into coactive engagement with its cam means.

7. In combination, a. shaft, means supporting said shaft for revolution about an external axis and for turning about its own axis, cam means mounted to surround said external axis, an arm fixed to said shaft and projecting suba lever mounted for oscillation about the axis of said'shaft and projecting therefrom substantially in the direction of projection of said arm, means carried by said lever at a point remote from said shaft axis and operatively engaging said cam means, and cooperative means on said arm and on said lever for shifting said lever angularly about said shaft axis relative to said arm and for holding said position of adjustment relative to said arm.

8. The combination of claim '7 in which said last-named means comprises an abutment on said lever and two oppositely-facing elements carried by said arm in facing relation to opposite surfaces on said abutment, said elements being independently adjustable, relative to said arm, along lines substantially tangent to acircle drawn about said shaft axis.

9. The combination of claim 7 in which said lever is longer than said arm, the free end of said arm being bifurcated, and in which said lastnamed means comprises a substantially radiallycated between the furcations of said arm, a screw adjustably mounted in one of said arm furcations and bearing against one face of said abutment, and a second screw adjustably mounted in the other of said arm furcations and bearing against the opposite face of said abutment.

10. In combination, a shaft, means supporting said shaft for revolution about an externalaxis and for turning about its own axis, cam means mounted to surround said external axis, a follower arm fixed to said shaft and projecting substantially radially therefrom and provided with means engageable with said cam means to control turning movement of said shaft about its own axis during revolution thereof, and means mounted to move with said shaft about said external axis and continuously resiliently urging said shaft toward turning movement in one direction about its own axis to hold said last-named means in cooperative engagement with said cam means.

11. In combination, a shaft, means supporting said shaft for revolution about an external axis and for turning about its own axis, cam means mounted to surround said external axis, a follower arm fixed to said shaft and projecting substantially radially therefrom and provided with means engageable with said cam means to control turning movement of said shaft about its own axis durin revolution thereof, an element fixed to said supporting means and projecting radially from the axis of said shaft, a member journalled for rotation about the axis of said shaft, a coiled spring having one end anchored relative to said shaft and one end anchored relative to said memsaid lever losa s bw e nfi ny' mam-11y; therefrom a s 'provided'with li nge ihe. p ab e el 1161s 5% 1i and means. q ip d? i Said me esiselee- 7, viii any 118 b 22 ui l ir o RQ iiiPQ I Qj qi iq'nal gn; m. lative be se 'q sninew. for fevol'ution'abont an external axis r turning about its own axis, Qam means to s irionml sgii xternail' agfxis', a 91- fln, fizge'l fto saga shaft and projecting. s bm'e 'ns engageabl'eswith' said cam means to cont of 'sg qysnafu about its t-rpi, Lupmn v fidii f. irm ng. bqet ts wn maimed to surround "said externelfnxis', a; n lew r x d o. eis ha t and lf i j fii 1 1y l idiagil yiherefrom' endpr'ovidegi with d l w h sai m 11 3 0 b movernent of said snejft-about'its is lut on er -9 n nul r o said siippdrting' means and eons i grii; with tri ax s, orsaid shaft, a se condfah a, bait, mea s supporting n s me: n xt r lel @3 n i s, ii y en i n mpemfieflzn q mroimivse s e t rn T si' 9%? a m fixe e q aid h lfit nd prdiecfiingsube sfiantieny radially ftheiefroin and provided' wi'fih & ense eeb yi t-h id' i n e er i l Wrms 'we em of e qf ie wtite n xna i'd k'; a i a t; niean su portine cam nakns hiss-138% 1 2 axisjduring revqlntiontni eoi, an element to said supporting means any;projecfeing ra giial ly f'roin't'he Lxis of'said shaft, 2. nieniiber j ournlleld or f 'iq i bqe' h' axe e is a'weng sp ing having one end anohored relaiive to seid er means rotationally fixed reletive tosaid me E: fi' w; m n ein' p limited xi l mqv menfi iejl jive thei etojthe other enqof said springbeing anehorecirelative to saidiastfnernedn eans and m d r holding sa mem eleqtive y in n 2 of a rali os iions. 3. p a ee d ustm n relat ve, t eig lelement n c m nation! a tor n din sepsis oi axia l pac axialsp j .r's asfh ha in ne end 'journalled in' one of said spiders and hayin a regiuced sectiona tr its. other end, an'annular element fixed to the other of said spiglers, a. bearingfinohiding an' outer rape; supported from said element andan inner, race sleevedvon said reduced section and supporting the, other end of said shaft, a, stud axially, re novap'ly. seemed to said other end of said shaft andhaving an ex ernel dieme r xc di a of ai r uces section said stud meeting, with said bearing inner race to coniine the same against? axial movement relative to saidsha ft an annular member jqure neueq. fer" rotation about they axis 01: 5am shaft, a iled: ri n n d: be een... a d; nnul r nen ber and said annula y element and having n enden he r a i e s id ann e emr her and one end anehogedrelative to said shaft, andmeens for holding said annular membelj seleotively in any .one'ofaphiirelity of positions of rotational a d jus tmenq relative to saidennular element. 16, The combination of claim 15in which said stud is pljovidepl with I an axially ezg'tendingkey slot, a key moented in s aidi'slot ffbr limited exial mov men therein; n a m ns an ho ng aid last-named end 0i said'spring to said. key.

1'7. If he combination of claim 16 inwhichsaipl ain l la r.zfne'rlribe r and seidennule r elen ent c0- opei ate todefine' a closed ohaznberin which said 59 1 1 5 s, ocate (11161 n hiqh said o din mews. om s n er 'neaeine; m a n ai em nt zx lmem en- DWARD REFERENCES. ITED.

The following references are of record in tlge file O h s a e t UNITED- STATES PATENTS me. Date. L ne, 17 7' "5772-7.- b.-

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