US2187758A - Bed motion - Google Patents

Description

F. w. sx-:YBOLD 2,187,758

BED MOTION Filed July 7, 1938 5 Sheets-Sheet 1 www y 4Jam. 23, 1940. F. w.v sEYBLD BED MOTION Filed July '7, 1938 5 Sheets-Sheet 2 l v I L 9/ Jan. 23, 1940.

F. w.vsEYBoLD 2,187,758

BED MoTroN FiledJuly v, 1938 5 snets-sheet s Siwa/rm mma, M, M'vm @HQ/man Jan. 23, 1940. l F. w. sEYBoLD 2,187,758

BED MOTION Filed July '7, 1938 5 Sheets-Sheet 4 7:"9. 5. Zzgl 7 /af fifa 35 Jan. 23, 1940. F. w. sEYBoLD 2,187,758

BED MOTION Filed July '7, 1938 5 Sheets-Sheet 5 Patented Jan. 23, 1940 UNITED .STATES fPATENT oFFicE 19 claims.: (o1. u zs) This invention. relates to .reciprocating bed motions or the like, and more particularly to mechanisms of this'characterespecially adapted to be-embodied .in printing presses'of the at bed and cylinder type. Y

The general object ofthe invention is to provide a novel and improved reciprocating bed mo-v tion-by means of which a bed or similar carriage member may be oscillated through a complete l0 cycle, the greater portion .of the movement in at least one direction k.being at substantiallyv constant. speed.

In attainingthis object, there is employed a train of driving gearing Whichfconnects the bed with a suitableisource of power, and which is `constantly in mesh, thus insuring a positive driving connectionwat all times. This' arrangement makes possible the elimination of all cams, gates, latches, locks or any intermittently operating reversing'gear; only such partsbeing .used in the construction of thedevicewhich' can be readily produced on standard machine tools at 10W cost. It, isl a. more particular object of the invention to provideareciprocating bed motion which comprises a systemof planetary-gearing including a driving'elementcarried by a planet gear and given a cyclic movement during operation, which by suitable vmeans is transformed into `oscillatory rectilinear motion and applied to the bed, The arrangement and proportionsof the parts are so selected as to producela cyclic movement of the driving element which will yield `as long a period as possible `of nearly constant velocity in the stroke of the bed, and furthervnovel means are :t3 provided for applying. anoscillatory movement E to the sun gear at certain points during the-cycle of mcvementof the driving gearing whereby a longer period ofy more nearly uniform speed will be produced. 4,9 In .itsl preferred'forms, the=invention contemplates the provision fof' planetary gearing which will develop, ina .crank pin yor- 'other intermediate driving element, ya cyclic vmovement having the generalcharacteristics of .either a hypotrochoid ,3 or an apitrochoid, but both the 4orbit and angular velocity of the crank element are modiiied by means of a novel arrangement of gearing Which rocks orv oscillates the otherwise stationary sun .gear about its axis, this serving to prolong the ,5&0 rperiod cf substantially constant velocity-of the bed and to render it more uniform.

As previously pointed out, the present inven tion has particularv adaptation to the printing It has long been recognized as desirable,

ing the vprinting period of a press of the type described, when the reciprocating type bedand the rotary impression cylinder arer in rolling contact, to have these members of the printing couple move at a uniform linear velocity so as to aid in securing the proper registry and prevent 51 the marring of the impression. Tins desired condition also renders unnecessary the awkward and diilicult alternative of rotating the impressionpcylinder ata-n irregular rate toadaptv it to any non-uniform motion ofthe bed. `1o

A reciprocating bed actuated by a sliding crosshead or yoke driven by a simple crank-arm, as in the case of the familiar Scotch yoke, would. Ihavea linear` velocity which varies continually, attaining a maximum at mid-stroke and equallo ling zero at points of reversal at the ends of the printingand return strokes. This movement is one ofsimple harmonic motion, the general Vevelocity equation of which is 26 V=wR cos 0 `where 0 is' the angle the driving crank makes With the horizontal. The velocity ratio curverrepresenting the relation of the velocity of the bed and the constant vlinear Velocity of the crank pin .2 5 would be, in that case, of course, thefamiliar sinusoid or sine curve. The problem, therefore,

is to produce a modified harmonic motion, which may be represented by a curve havinga atter loop'than the' sinuso-id, indicating a more nearly constant speed during at least the greater portion l of the printing stroke.

.driving the bed during different portions of its printing and return strokes and also for effecting thereversal of the bed at the ends of the ,4Q strokes; others have usedgrooved cam members or similar difcultly myachinable elements in the driving train; and still others have approximated the attainment of the desired conditions by the development in the bed of a motion Which is the projection upon a straight line of thev cyclic movement of adrive element developed by an ordinary planetary system.

v Theexpedient last cited has the advantage of eliminatingv certain. of the irregular parts to which reference has been made, but it falls quite short of .providing a uniform velocity period of any considerable duration or accuracy during the cycle.

" All'v of these irregularities` and deciencies are 55 eliminated by the various provisions of the pres ent invention, as will be set forth in greater detail in the following specification, which together with the accompanying drawings disclose two embodiments of the invention which are exemplary only and not to be interpreted as limiting the scope of the invention which is defined in the subjoined claims.

In the instant specification, the two species of the invention disclosed provide the constant velocity periods in both the printing and return portions of the cycle. Two other species within the generic scope of the invention are disclosed in my copending application Serial No. 217,995 led July 7, 1938, contemporaneously with this one; those species providing the constant velocity period only during the printing stroke.

In the drawings:

Figure l isv a vertical transverse sectional View through a bed and cylinder printing press embodying the principles of the invention;

Figure 2 is a fragmentary horizontal sectional view taken on line 2-2 of Figure l;

Figures 3, 4 and 5 are fragmentary longitudinal vertical sectional views taken on lines 3 3, 4-4, and 5-5 respectively of Figure 1;

Figure 6 is a fragmentary view in horizontal section taken on line 6-6 of Figure 1;

Figure 7 is a view similar to Figure 1 but illustrating an alternative embodiment of the invention;

Figure 8 is a diagram illustrating the movement and relationship of certain parts of the mechanism for oscillating the sun gear of either of the illustrated embodiments;

Figure 9 is a diagram of the movement and relationship of the essential elements of the planetary system in the embodiment illustrated in Figures 1-6 inclusive;

Figure 10 is a similar diagram based on the embodiment shown in Figure '7;

Figure l1 is a graphical representation of the velocity ratios during the cycle of movement of the driving crank element; and

Figure 12 is a diagram of the planetary system of the rst described embodiment on an enlarged scale, furnishing a graphic explanation of the elements of the velocity and displacement equations involved.

In presenting the detailed specification of the invention, the mechanical structure and its operation will be described and then the underlying theoretical considerations will be explained and their mathematical basis set forth.

In Figures 1-6 inclusive of the drawings, a printing press of the two-revolution, flat bed and cylinder type is indicated generally by the reference numeral IU. As to be inferred from the designation of the press, the impression cylinder II makes two revolutions while the type bed I2 is making one oscillation.

The bed I2 is of course mounted for rolling contact with the impression cylinder II during the printing stroke. 'Ihe means for supporting the bed during its oscillatory movement comprises the conventional rollers I3 which are disposed between the tracks I4 carried respectively by the bed and portions of the press frame I5. The bed is guided by means of the bed rack I6 and the gibs I! which are suitably supported from the bed, and which are arranged for sliding contact with the guideways I8 and I9 provided on the press frame.

The impression cylinder II is driven from the large main driving gear 20 which is rotated from any suitable source of power, this gear 20 being keyed to the main drive shaft 22 which is rotatably mounted in the bearings 23 provided in the frame I5. The means for rotatably supporting the inner portion of this shaft will be described in connection with the bed driving mechanism. The large gear 2l) meshes with the impression cylinder gear 24 which is carried upon the end of the impression cylinder shaft 25 which is suitably supported in the bearings 26 carried by the press frame.

The mechanism for driving the bed I2 will now be described; this mechanism being arranged to oscillate the bed through a complete cycle while the impression cylinder is making two revolutions, and also being adapted to move the bed at the same constant linear speed as the impression cylinder during the printing stroke. Upon the inner end of the main drive shaft 22 there is keyed as at 3| the crank disc 30 which is provided with the bearing bushing 32 in which the crank member 33 is rotatably mounted. 'I'he crank4 member 33 comprises the intermediate shaft portion 34 upon one end of which is formed the eccentric crank pin portion 35 which through certain operative connections transmits the driving force to the bed. Upon the opposite end of the crank member 33 there is provided the planet pinion 36, all of these portions of the member 33 being formed integral if desired. The planet pinion 36 meshes with, and is adapted to roll about the oscillatable sun gear 40, this sun gear being secured as by means of bolts 4I to the member 42. 'Ihis member is provided with a tubular portion 43 freely rotatable upon the shaft 22 and separated therefrom by means of the bearing bushing 44. The portion 43 also serves to support and guide the shaft 22 for rotation within the bearing boss 46 formed on a portion of the frame I5. The member 42 is provided with a slotted arm 45 as very clearly shown in Figure 5 of the drawings.

A gear 48 is keyed as at 49 to an intermediate portion of the main shaft 22 and meshes with a smaller gear 50 carried by the stub shaft 5I rotatably carried in the boss or enlargement 46 of the frame I5. Upon the inner end of the stub shaft 5I there is formed the eccentric crank pin 55 which carries a block 56 adapted to move within the slot 51 of the slotted arm 45 of the member 42. It will thus be seen that as the crank pin 55 rotates it imparts an oscillatory movement to the member 42 which as described is rigidly secured to the sun gear 40, and this oscillation is transmitted to the sun gear and thus modifies the cycle of movement of the main driving crank pin 35 and alters the ultimate effect on the bed.

The means for transmitting the movement of the driving crank pin 35 to the bed I2 includes the following mechanism. The pin 35 carries a block 58 which is adapted to slide within the vertical slot 59 formed in the horizontally sliding cross-head member 60. The member 60 is provided with suitable bores adapted to receive the two horizontal shafts 62 and 64 by which the cross-head is guided; these shafts being mounted at their ends in the portions 65 formed on the frame I5. A stub shaft 68 is carried upon the upper central portion of the cross-head 60 and upon its projecting end a traveling gear T0 is rotatably mounted, this gear meshing with the bed rack I6 and also with the stationary rack 'I2 which is secured to and is supported by the bracket portion 'I3 of the frame I5. It will be readily seen from this arrangement that the travvellin'gl gearA kseryesto lvdouble the movement'cf the 'cross-head as it is'appliedf to the bed I2. 'The sun geardllf has twice as many teeth as the planet gear 36 and the gear 48 of the sun gear`r 'oscillating ytrain has three times thenumber of teeth 'as the pinion 502 Also, iin the initial setting of the planetary and .modifying systems, when lthe gear 36 is vertically above the 'gear Ml', the cranklex-tends downwardly.' and the modifying crank 55 is l'lorizontalv andextendsf-inward'- ly toward the center-of the shaft 22..

Referencel'may now be hadftov Figures 9v and 'l2 of the drawings whichcomprise'fdiagrarnsiof .the planetarysystem and `its `movements` without beneto therectifying or'inodifyinggearing 48, 5U. 'The center of the shaft-.Nuis indicated at YO and theperiphery of the sun gear 4lill-about which the pinion .3o rollsis indicatedat B:. The

length'of the crank arm? of thecrankpin '35 is designated C. Under Athese conditions, asl the planet pinion 36 rolls about the sun'gear 40, the crank pin 35 generates afprolate epitrochoid indicated at A. By means ofthe pinand slot connection with .thefcross-head 60 themotion transmitted to the cross-head by the crank pin-35 is the projection'of the motion-of thecrank pin :upon 'the horizontal line passing through the center O, the' displacement 'of this :motion vbeing indicated by S.

The displacement equation for this vmotion may be expressed asfollows:

S'czrsm @fc sin (Mii) e 1) this equation expressing the ordinate of `the epitrochoid which, of course, is the path `generated by a point ,on the radius of axcircle rolling upon Ithe exterior periphery of anbase circle.

the length of the crank armv 35 being 57A@ or 5.7%. of the length of the crank disc 3D.

. The velocity ratio equationis obtained by dif ferentiating the displacement equation` with re"- spect to time and is found to be l v= 1oo coso-nimeer 3) where w is the angular velocity ofthe-crank disc 39.

This equation is represented graphically -by the solid line curve I in Figure l1 in which the velocity ratios of the disc- 3i?V to the crank pin $5 are plotted against the angular displacements of the crank disc. The acceleration ratio equation is represented by the curve II.

It will bev seen that' the velocity ratio curve yields twoportions which are nearlydevel but which do not represent a velocity which is constant enough for the purpose during the printing However, by means of the rectifying gearing i5-55 which appliesthree smail oscillations to the sun gear iduring .a given cycle, the velocity ratio curve may be leveled as indicated by the dotted line a, .thus .providing a relatively prolonged period of 1.substantially uniformtveloci'tywhich yisapplied to the bed l2 during the printing stroke. It` will be noted also thatl this curve is symmetrical and that the same uniform motion is applied during the return stroke. Referring. now to Figure 8 of the drawings the effect of the rectifying-gear train upon the motion of the crank pin 35 will be described. In this ligure d is the distance between the centers of the gears 4B and 50; R2 equals the length of the crank 55; a equals the angle the slotted arm do makes with the line connecting the centers of gears ilrand 50 or as developedgraphically in the diagram of Figure 8, the kangle a may be expressed by L RZ'SII 30 a-arc Land- R2 COS 36 (4) which is the angle the sun gear is being oscillated by the crank pin 55. Since the sun gear vl0 is twice the size of the planet pinion 36, the crank 35 will turn through an angle 2a, and the displacement of the cross-head in the final mechanism can be expressed by S=100 sin 0-5.7 sin (3H-2a) (5) I' R2 sin 30 S-lOOsm 6 5.7 sin (30 2 arc cand R2 cos 30 (6 By making the compensating crank arm R2 of suitabIelength, the velocity of the type bed can be made practically uniform during approximately 58% of the stroke of the bed which is quite adequate and practical for the operation'of -a two-revolution, flat vbed printing press. -v `,Referring now-toFigure 7 of the drawings in whicha modicationof the previously described- ,arrangement is shown, the'sarne refer-encecharlacters are applied` as in the prior construction with the addition of primes. Thus," the imlpression cylinder Il' rolls-,upon the oscillating bed- 12.', which issuD-portedupon suitable rollers I3 and carries the bed rack l.. ,The .main driving shaft 22 is carried in .bearings in the Aframe I and has the crank disc 30,. keyed there- 4toat 'its inner end. Thecrank disc rotatably carries the crank assembly 33 which includes the driving crank pin 35 and the planet Apinion 35', the latter meshing with the internal sungear dll which comprises the ring gear portion Mia secured to the periphery of the wheel or disc Mlblas by means of the bolts Mic. The internal sun gear 49 is secured to the oscillating member e2' as by means of the bolts 4l. The member 42 is provided with a slotted arm just as .in the case previously described and is oscillated by exactly similar means which includes the gear .48 ,keyed as at 49 to the shaft 22'.

The crank pin 35 carries the block 58 which `moves. in the vertical slots 59 formed in the cross-head 68' which is mounted for horizontal .oscillation in the same way as described in the previous embodiment. The cross-head 6D also carries the gear i0 which meshes with the bed .rack I5' and the stationary rack 12.

The'motions developed in this embodiment are depicted in the diagram of Figure of the drawings in which the periphery of the internal sun sgear 4d' is represented by the reference character Brumm which the planet pinion 35 rolls. The

path described by the crank pin 35' is in this caserhowever, a prolate hypotrochoid indicated at A2. The crank arm of the crank 35 is indicated LatC..

In this embodiment, since the rotation of the planet pinion in the case of the internal gear construction is opposite in direction to that of the external gear construction, the expression Mil of the general Equation (l) becomes M-l under these circumstances and the gear ratio being 4:1 the displacement equation as modied by the compensating gearing becomes However, since M=4 in the case of the internal gear and M=2 in the case of the external gear, the final values of the equations in the two cases are the same, and thus both constructions yield the same motion in the type bed. The curves Ia and II in Figure ll represent the velocity and acceleration ratios in this embodiment also.

It will thus be seen that there has been provide-fl by the present invention novel mechanism for developing a projected motion in the bed of a printing press of the type described which is derived from the cyclic motion of a crank element appropriately modied or rectified by oscillation of the sun gear to yield the desired period of uniform velocity during the greater portion of the printing stroke.

It is understood that various changes and modifications may be made in the embodiments illustrated and described herein without departing from the scope of the invention as defined by the following claims.

The phrase without retracement as employed in certain of the claims is used, as in my prior Patents Nos. 2,082,183 and 2,082,184, to indicate that the driving element moves continuously in one direction along its closed orbit and never retraces its path therealong duringany single cycle of movement.

Having thus described my invention, what is claimed as new and desired to be secured by Letters Patent is:

l. A bed movement of the type described in which the bed during its working and return strokes is reciprocated in a plane, comprising the combination with the bed and means for supporting the same for planar movement, of a driving element, a member rotatable at a constant angular velocity for moving said driving element without retracement along a cyclic path, transmission means for maintaining a constant oper- 4ative connection between said driving element and said bed, and means operatively associated with said member for introducing certain variations in the angular velocity of said driving element, whereby said bed is caused to move at a substantially uniform linear velocity during portions of its cycle oi reciprocation.

2. A bed movement of the type described in which the bed during its working and return strokes is reciprocated in a plane, comprising the combination with the bed and means for supporting the same for planar movement, of a driving element, means rotatable at a constant angular velocity for moving said driving element without retracement along a cyclic path which is symmetrical about the center of rotation of said means, transmission means for maintaining a constant operative connection between said driving element and said bed, and means driven by said second named means and operatively connected with said driving element for introducing certain variations in the angular velocity and cyclic path of said driving element, whereby said bed is caused to move at a substantially uniform linear velocity during substantial portions of its working stroke.

3. A bed movement of the type described in which the bed during its working and return strokes is reciprocated in a plane, comprising the combination with the bed and means for supporting the same for planar movement, of a driving element, means rotatable at a constant angular velocity for moving said driving element without retracement along a cyclic path which is symmetrical about the center of rotation of said means, transmission means for maintaining a constant operative connection between said driving element and said bed, and means driven by said second named means and operatively connected with said driving element for introducing certain variations in the angular velocity and cyclic path of said driving element, whereby said bed is caused to move at a substantially uniform linear velocity during substantial portions of its working stroke, the path of said element being a prolate epi-trochoid modified by said last named means.

4. A bed movement of the type described in which the bed during its working and return strokes is reciprocated in a plane, comprising the combination with the bed and means for supporting the same for planar movement, of a driving element, means rotatable at a constant angular velocity for moving said driving element without retracement along a cyclic path which is symmetrical about the center of rotation of said means, transmission means for maintaining a constant operative connection between said driving element and said bed, and means driven by said second named means and operatively connected with said driving element for introducing certain variations in the angular velocity and cyclic path of said driving element, whereby said bed is caused to move at a substantially uniform linear velocity during substantial portions of its working stroke, the path of said element being a prolate hypotrochoid modified by said last named means.

5. A bed movement of the type described in which the bed during its working and return strokes is reciprocated in a plane, comprising the combination with the bed and means for supporting the same for planar movement, of a driving element, means rotatable at a constant angular velocity for moving said driving element without retracement along a cyclic path which is symmetrical about the center of rotation of said means, means driven by said second named means and operatively connected with said driving element for introducing certain variations in the angular velocity and the cyclic path of said element, transmission means maintaining a constant operative connection between said element and the bed, said transmission means adapted to develop a projection of the modified cyclic motion of said element upon a line extending longitudinally of said bed and transmit it to the bed, the motion imparted to the bed having a period at substantially uniform velocity, which period comprises the greater portion of one stroke of the bed.

6. A bed movement of the type described in which the bed during its working and return strokes is reciprocated in a plane, comprising the combination with the bed and means for supporting the same for planar movement, of a driving` element, means rotatable. at a conf Anamed means and operatively connected with said driving element for introducing certain regularlyv recurring variations in the angular velocity and the cyclic path of said element, transmission means maintaining a' constant operative connection between said element and the bed, said transmission means adapted to develop an oscillatory motion which is a projection of the modied cyclic motion of said element uponl a diameter of the cyclic path of said element, to amplify said projected motion, and to apply the vresultant oscillatory motion to said bed, the

.motion imparted to the bed having a period at substantially uniform velocity, which period-comprises the greater portion 'of one stroke of the A7. `A bed movement of the type describedin which the bed during its working and return strokes is reciprocated in a plane, .comprising the combination with the bed and means for supportingthe same `for planar movement, of a ldriving element, means rotatable at a constant Aangular velocity for moving said drivingvelement without retracement along a cyclic path lwhich -is symmetrical about the center of rotation of said means,` means operatively connecting said driving element with said rst named means and comprising a planetary system including a sun gear and a planet gear, means actuated by said second 'named means for oscillatingY said sun gear during the cycle of movement whereby the angular velocity of said driving element is varied during its cycle to introduce corresponding variations in the motion of the bed, and transmission .means maintaining a constant operative connection between said element and said bed.

8. A bed movement of the type described in which the bed during its working and return strokes is reciprocated in a plane, comprising the combination with the bed and means for supporting the same for planar movement, of a driving element, means rotatable at a constant angular velocity for moving said driving element Uwithout retracement along a cyclic path which is symmetrical about the center of rotation of said means, means operatively connecting said driving element with said second named means and comprising a planetary system including a lsun gearand a planet gear, means actuated by said second named means for .oscillating said sun gear during the cycle of movement whereby the angular velocity of saidA driving element is varied during its cycle to introduce correspond- ,ing variations in the motion of the bed, and transmission means maintaining a constant operative connection between said elements and said bed, said transmission means comprising alsliding cross-head having a pin and slot connection .with said driving element and carrying a trav- 'elling gear, which meshes with a rack on said bed and with a iixed'k rack on said supporting means..

9. A bed movement of the type described in 4porting'the same for planar movement, of driving means rotatable at a uniform angular velccity, a. planetary system including a sun gear mounted for limited oscillation about its axis,

and a planetgearxadapted to be rolled 'about said ried by saidplanet vgear and means operativelyv connecting said crank pin with'said `bed and including a pin and slot connection, means also actuated by .said driving means for periodically oscillating sai-d sun gear, whereby certain variations are introduced in the normal angular velocity and cyclic orbit of thecrank pin produced by said planetary system, so that a prolonged period of motion ofsubstantially uniform linear velocity .is produced in the movement of said bed. v

;l0. A bed movement of the type described in which the bed during its working and return strokes is reciprocated in a plane, comprising the combination witlrthe bed and means for supporting the same for .planar movement, of a` mountedonv said supporting means for oscillatv ing movement' longitudinally of said bed, 4a travelling gear rotatablymounted on said crosshead and meshing with both said bed rack and said stationary rack, a slot formed in said crosshead, a crank pin adapted vto move along a closed cyclic orbit and, by engagement within said slot, to produce in said cross-head a rectilinear oscillation which is'fthe projection of said cyclic motion upon one ofthe diameters of its closed orbit, means `for generating said cyclic movement in said crank pin comprising a planetary system which includes asun gear and a planet gear adapted. to roll about said sun gear, said crank pin being carried by said planet gear at a point spaced from its center,n means for rolling said planet gear at a. uniform angular velocity and means for periodically oscillating said sun gear about its airisV during the cycle of movement.

11. A bed movementoi the type described in .which the bed during its working and return ion rotatably carried by the free end of said crank, a sun gear about which said planet pinion is adapted to. roll, a crank pin carried by ysaid pinion at a pointspaced yfrom its center, and transmission .means for applying the movement said drive shaft, another gear rotatably mountsun gear whereby the latter maybe oscillated periodically during the cycle of movement of the .bed motion to modify the motion developed by the crankpin and transmitted to the bed, whereby the bed is caused to move at a substantially constant linear velocity during the greater lpor- .tionl of vat leastV one of. its strokes,

l2. A bed movement of the typev described in which the bed during its working and return strokes is reciprocated in a plane, comprising the icombination with the bed and means for supyof said crank pin to the bed, a gear secured to ed insaid supporting means, and a crank con- .nection rbetween saidlast named gear and the porting the same for planar movement, of a` main drive shaft adapted to be rotated at a uniforma-angular velocity from a suitable source of power', a crank on said drive shaft, a planetl piniony rotatably carried l by the free end of said crank', a sun gearconcentric with said shaft about lwhich vsaid planet pinion is adapted toA roll, a

crank pin carried by said pinion at a point spaced from its center, and transmissionI means includ'- "ing a. sliding cross-head having a pin and slot connection with the crank pin for applying the movement of said crank pin to the bedpa gear secured to said drive shaft, another gear rotatably mounted in said supporting means, a crank pin carried by said last named gear, a carrier for oscillatably supporting said sun gear, and a connection between said last named crank pin and said carrier for oscillating the same, whereby the bed is caused to move at a substantially constant linear velocity during the greater portion of at least one of its strokes.

13. A bed movement of the type described in which the bed during its working and return strokes is reciprocated in a plane, comprising the combination with the bed and means for supporting the same for planar movement, of a main drive shaft adapted to be rotated at a uniform angular velocity from a suitable source of power, a crank on said drive shaft, a planet pinion rotatably carried by the free end of said crank, a sun gear concentric with said shaft about which said planet pinion is adapted to roll, a crank pin carried by said pinion at a point spaced from its center, and transmission means including a sliding cross-head having a pin and slot connection with the crank pin for applying the movement of said crank pin to the bed, a gear secured to said drive shaft, another gear rotatably mounted in said supporting means, a crank pin carried by said last named gear, an annular gear carrier surrounding a portion of said drive shaft, relatively rotatable therewith, and rigidly secured to said sun gear, a slotted arm on said carrier, within the slot of which said last named crank pin is engaged, whereby said sun gear is periodically oscillated during the cycle of movement of the bed motion, and whereby the bed is caused to move at a substantially constant linear velocity during the greater portion of at least one of its strokes.

14. A bed movement of the type described in which the bed during its working and return strokes is reciprocated in a plane, comprising the combination with the bed and means for supporting the same for planar movement, of a main drive shaft adapted to be rotated at a uniform angular velocity from a suitable source of power, a crank on said drive shaft, a planet pinion rotatably carried by the free end of said crank, an externally toothed sun gear about which said planet pinion is adapted to roll, acrank pin carried by said pinion at a point spaced from its center, and transmission means for applying the movement of said crank pin to the bed, a gear secured to said drive shaft, another gear rotatably mounted in said supporting means, and a crank connection between said last named gear and the sun gear whereby the latter may be oscillated periodically during the cycle of movement of the bed motion to modify the motion developed by the crank pin and transmitted to the bed, whereby the bed is caused to move at a substantially constant linear velocity during the greater portion of at least one of its strokes.

15. A bed movement of the type described in which the bed during its working and return strokes is reciprocated in a plane, comprising the combination with the bed and means for supporting the same for planar movement, of a main drive shaft adapted to be rotated at a uniform angular velocity from a suitable source of power, a crank on said drive shaft, a planet pinion rotatably carried by the free end of said crank, an internally toothed sun gear about which said planet pinion is adapted to roll, a crank pin carried by said pinion at a point spaced from its center, and transmission means for appplying the movement of said crank pin to the bed, a gear secured to said drive shaft, another gear rotatably mounted in said supporting means, and a crank connection between said last named gear and the sun gear whereby the latter may be oscillated periodically during the cycle of movement of the bed motion to modify the motion developed by the crank pin and transmitted to the bed, whereby the bed is caused to move at a substantially constant linear velocity during the greater portion of at least one of its strokes.

16. A bed movement of the type described in which the bed during its working and return strokes is reciprocated in a plane, comprising the combination with the bed and means for supporting the same for planar movement, of a main drive shaft adapted to be rotated at a uniform angular velocity from a suitable source of power, a crank on said drive shaft, a planet pinion rotatably carried by the free end of said crank, an externally toothed sun gear about which said planet pinion is adapted to roll, a crank pin carried by said pinion at a point spaced from its center, and transmission means for applying the movement of said crank pin to the bed, a gear secured to said drive shaft, another gear rotatably mounted in said supporting means, and a crank connection between said last named gear and the sun gear whereby the latter may be oscillated periodically during the cycle of movement of the bed motion to modify the motion developed by the crank pin and transmitted to the bed, whereby the bed is caused to move at a substantially constant linear velocity during the greater portion of at least one of its strokes, the ratio of the sun gear to the planet pinion being 2:1 and the ratio of the gear carried by the drive shaft to the gear rotatably carried by the supporting means being 3:1.

1'7. A bed movement of the type described in which the bed during its working and return strokes is reciprocated in a plane, comprising the combination with the bed and means for supporting the same for planar movement, of a main drive shaft adapted to be rotated at a uniform angular velocity from a suitable source of power, a crank on said drive shaft, a planet pinion rotatably carried by the free end of said crank, an externally toothed sun gear about which said planet pinion is adapted to roll, a crank pin carried by said pinion at a point spaced from its center, and transmission means for applying the movement of said crank pin to the bed, a gear secured to said drive shaft, another gear rotatably mounted in said supporting means, and a crank connection between said last named gear and the sun gear whereby the latter may be oscillated periodically during the cycle of movement of the bed motion to modify the motion developed by the crank pin and transmitted to the bed, whereby the bed is caused to move at a substantially constant linear velocity during the greater portion of at least one of its strokes, the ratio of the sun gear to the planet pinion being 2:1 and the ratio of the gear carried by the drive shaft to the gear rotatably carried by the supporting means being 3:1, and the length of the crank arm of the first named crank pin is 5.7% of the length of the arm of the first named crank.

18. In a bed motion of the class described, in combination, a supporting frame, a main drive shaft extending through portions of said frame,

a planetary system actuated by said drive shaft and including a sun gear concentric with and surrounding said drive shaft, an annular hub on said sun gear Within Which said drive shaft bears and which in turn has a bearing in said frame,v

and gearing driven by said shaft and operatively connected with said sun gear for applying periodic oscillations thereto to modify the motion developed by said planetary system.

19. In a printing press of the'reciprocating bed and rotary impression cylinder type, in combination, a supporting frame, a type bedmounted in said frame for rectilinear reciprocation, means for driving said bed through successive cycles of variable linear speeds, the greater portion of the printing stroke of the bed being at a uniform velocity corresponding with that of the impression cylinder, said means comprising a main drive shaft adapted to be driven at a uniform angular velocity, a train of gears operatively interposed between Said shaft and said impression cylinder, a crank on said drive shaft, a planet pinion rotatably carried by the free end of said crank, a sun gear about which said planet lpinion is adapted to roll, a crank pin carried by said pinion at a point spaced from its center,

, and transmission means for applying the movement of said crank pin to the bed, a gear secured to said drive shaft, another gear rotatably mounted in said supporting means, and a crank connection between said last named gear and the sun gear whereby the latter may be oscillated periodically during the cycle 0i movement of the bed motion to modify the motion developed by the crank pin and transmitted to the bed, Whereby the bed is caused to move at a substantially constant linear velocity during the greater portion of at least one of its strokes.

FREDERICK W. SEYBOLD.l

Images