US1398817A - Bed-motion for sheet-printing presses - Google Patents

Description

/ B. F. UPHAIVI AND F. R. BELLUCHE.

BED MOTION FOR SHEET PRINTING PRESSES.

APPLICATION FILED MAR. I7, 1920- Patented Nov. 29, 1921;

4 SHEETS-SHEET I.

B. F. UPHAM AND F. R. BELLUCHE.

BED MOTION FOR SHEET PRINTING PRESSES.

APPLICATION FILED MAR. I?

APPLICATION FILED MAR. 17, 1920.

Patented. Nov. 29, 1921.

4 SHEETSSHEET 3.

B. F. UPHAM AND F. R. BELLUCH E. BE MOTION FOR SHEET PRINTING PBESSES.

APPLICATION FILED MAR. 17, I920- Patented'Nov 29; 192L- 4 SHEETSSHEET 4- L n wanted States, said UPHAM residing at Brookline, in

- chusetts, and said BELL'UOHE residin BURT F. UIPHAM, OF BROOKLIN'E, AND FRANK R. BELLUCHE, OF MANSFIELD, MASSA- CHUSETTS, ASSIGNORS TO UNITEDPRINTING MACHINERY COMPANY, OF BOSTON, MASSACHUSETTS, CORPORATION OF MASSACHUSETTS.

BED-MOTION FOR SHEET-PRINTING PRESSES.

Specification of Letters Patent.

Application filed March 17, 1920. Serial No. 366,592.

To all whom it may ooneem: v

Be it known that we, BURT F. UPHAM and FRANK R, BELLUGHE, citizens of thelUnited the county of Norfolk and State of Massaat Mansfield, in the county of Bristol and tate of Massachusetts, have invented certain new and useful Improvements in Bed-Motions for Sheet-Printin Presses, and we hereby declare that the to lowing is a full, clear, and exact description thereof, reference being had to the accompanylng drawings, which form part of this specification.

, This invention is a novel means for imparting reciprooatory movements to objects; such, for example, as the beds of printing presses, where it is desired to move the object at a uniform speed durlng one.portion of each stroke and to reverse the movement of I the object gradually at the end of such uni- .form movement.

The invention in particular is an improvement upon the movement shown in Burt F.

Uphams Patent No. 1,094,405 of April 21, 1914; and the objects of the present invention are, to provide novel means for driving the bed on the uniform portions of its strokes; to provide novel means for reversing the'bed at the end of the uniform portions of its strokes; to so construct the reversing mechanism that the reverse stresses will be exerted on the bed at'approximately its center; to make the reversing mechanism compact, durable, andeasily accessible; to

. simplify and improve the construction of the reversing mechanism shown in said p'atent;

and to dispense with the swingable parts or gates in the reversing mechanism.

In this invention as in said patent the mechanism is so constructed that during the reversals, the forces acting on the-reciprO catingbed and-tending to stop and start the same in the opposite d rection will be exerted in a downward direction on the bed and parallel thereto, and thus tend to keep it at all times in close contact with the bed supports, and prevent any tendency to throw the bed upwardly away from thefsupports during the reversing operation.

We willexplain the invent on with reference to the accompanying drawings which Patented Nov. 29, 1921.

illustrateone practical embodiment thereof,

adapted for reciprocating the'bed ofa print- 1ng.press, or like machine to enable others skilled in the art to. understand and use the invention; but the invention is not restricted to the particular construction and ap lication of the invention shown in said ings, and all changes, variations and modifications are intended to be included as fall within the scope of the claims appended hereto.

In said drawings: 1

Figure 1 is a longitudinal sectional elevation-on line 1-1 of Fi 3 of part of a printing press showing tl ie' means for driv- 1Il% and reversing the bed.

ig. 2 is a similar view looking from the opposite side on line 2-2 of Fig. 3.

Fig. 3 is a right hand elevation of Fig. 1.

Fig. 4 is a transverse vertical section on line 4-4, of Fig. l. 1

Fig. 5 is a detail edge view of one of the bearing portions 1, which rest upon "the raw-- usual bedrollers or sliders 2. The portions I 1" may be prolonged at'each end of thebed by means of extensions 1 formed integral with the bed as shown. The sliders 2 are shown as supported on the usual guides 2 rigidly mounted in the press frames as usual. The, bed is prevented from lateral play on the sliders 2 by means of gihs 1 attached to the under side of the bed and engaging opposite sides of the guides 2, as shown in, Fig. 3.

The bed 1 is further preferabl formed withan integral longitudinally, epending portion '1", intermediate with the bearers 1 and, in tlie exampleshown', at one side of the'center of the bed. The inner ortion or face l-f of this part1" is prefefrab y perpen- 1 an view of the reversa vertical the-central line of the-bed.

dicular to the top surface of the bed and in plane approximately parallel with In the opposite ends of the part 1 are formed air cylinders 1 (see Fig. 1) which are adapted to engage pistons (not shown) at opposite ends of the bed, for the purpose of air cushioning the reversal movements of the bed in the usual manner. Y

A bracket casting 3 (see Fig. 6) is. attached to the inner face 1 of the portion 1, said casting being approximately triangular I in form and arranged with its apex uppermost, and preferably at the transverse center line of the bed. The sides of this casting are oppositely inclined at angles of less than" ninety degrees (preferably 45 degrees each) to the surface of the bed. To the opposite inclined surfaces of this casting 3 are respectively securely attached removable shoes 3*, 3, hereinafter referred to.

i to the face 1 of A guide casting 4 is bolted to the facel of the part 1 and lies exterior to but substantially parallel with the shoe Won the casting 3. c The side of casting i 'opposite the shoe 3 this concaved portion is adapted to be contacted by a guard roller 15 during the period of reverse, as hereinafter explained. The casting .1: is also provided near its upper end with a short straight portion 4, towhich may be attached a short straight shoe 4, which lies exactly parallel with and opposite to the upper portion of the shoe 3 (see Fig. 2) and the reverse roller 5 (hereinafter referredto) traverses the slot between the opposed shoes 3*, 4? during the actual reversal of the bed when at the outer or feed-board end of the press.

A guide casting 4', in all respects similar to but the reverse of casting f, is secured part 1 directly opposite the'shoe 3? on' the casting 3; this casting 4" has a curved face 4 similar to the curved face 4 of casting 4 and adapted to be engaged with a uide roller 15 (hereinafter referred to during the reversal of. the bed at the inner end of its stroke. Castlng 4" has a straight upper portion i" to which is secured a shoe 4, (corresponding to the shoe 4) which is directly opposite and parallel with the upper end of the shoe .gear'6), when the bed is slightly concaved as at a and 9 bed carries a uouslyin mesh with a pinion 1Orotatab1y '120 formed between the'opposed shoes 3?, a is adapted to be engaged by a roller 5 mounted upon a crank pin 6 attached to a gear 6 (hereinafter referred to) when the bed is moving outward and at the end of the uniform portion of its stroke. The slot formed between the opposed shoes 3 4 is adapted to be engaged by a roller 5 (mounted on a gear 7 corresponding to the is moving inward and at the end of the uniform part of its stroke. Two bed driving gears 8 and9 are arranged between the gears 6 and 7 (see Figs. 1, 2 and 8.) The gears 6, 7 8, and 9 are of the same size; gears 8 and 9 intermesh; gear 9 meshes with and drives gear 6; and gear 8 meshes with and drives gear 7; the gears 8 and 9 rotate in epposite directions, ass-d0 the gears 6 and 7. All these gears are journaled or supported in the 3; main frame in any suitable way. The gear 9may be mounted on a driven shaft 9 suitably journaledin the frame and said shaft is preferably so geared to the cylinder shaft (by any suitable gears, .not shown) that gear will (in the construction shown) make, say two revolutions to each revolution of the impression cylinder C, and consequently each of the gears 6,7, and 8 makes a like number of revolutions, to each revolution of 95 the cylinder.

I In the construction shown the bed is driven uniformly during one-half a revolution of gear 9 (or 8) and at the end of such uniform movement and during the next half revolu- 100 .t1on of the gear 9 (or 8) the bed is reversed so that in the movement the time required for uniform movementof the bed and the 7 time required for reversal of the bed are equal; and the total length of stroke of-the bed during the uniform portion of its inward stroke and the bed isreversed at a time when neither gear. 8 or 9 is in control of the bed.

To enable the gears Sand 9 to rotate on fixed axes and at the same time drive the bed, 1 15 we preferably Eprovide shiftable intermediate gear or gears;

etween the gears 8 and 9 and the bed rack.

In the construction shown the single rack 11,which iscontinmounted on a stub shaft 10* 10; and on this stub-shaft connected with carried by a yoke 10 and rigidly gear 10 is a slightly smaller gear 10 which latter is caused to alternately mesh with se ments Wand of ears 9 an 8. s shown the yoke 10 is fulcrume'd on a 8 on the sides pm or stud '10? suitably mounted in the frame adjacent the gearsS and 9, said yoke In the construction shown the slot being curved so that it can clearthe se,,-

.mental gears 9 8". The yoke has a dependthe segment 9 (or 8") and into position to be en aged with the other segment 8 (or 9). he yoke is caused to shift the pinion 10 during the reversals of the bed and while it is clear .of both segments 8", and 9 During each reversal of the bed the pinions 10, 10, will be slowed down, stopped, and reversed in rotation by reason of the constant engagement of the bed rack 11 with pinion 10; and as the bed is slowed down, stopped, reversed:- and brought up to full speed in the opposite direction, the pinions 10, 10 are also slowed down, stopped, reversed, and brought up to full peripheral speed equal to the speed of movement of the segments 9*, 8*, so that the pinion 10* will mesh with the segment 8 (or 9") without any clashing just before and as the' roller 5 (or 5) surrenders control of the bedat the end of the reversalmo'vement; and-thereafter the bed is positively driven on its uniform stroke by: the motion positively imparted thereto by the gear 8 (or 9) through the segment 8 (or 9 and the pinions 10, 10 and rack 11.

By referring to Fig. 2 it will be seen that the segments .9", 8", correspond in radius and size with the gears 8 and 9, and their teeth are uniform with the teeth ofthe gears and thesesegments maybe attached to or formed with said gears- As shown each of the segments 8", 9 is practically 180 degrees in extent and they are so set on their respective gears 8 and 9 so that the leading edges of these segments will simultaneously reach the points for engagement with the pinion 10"; or for disengagement therefrom, at the same time.

portion ofits stroke,(imparted thereto by segment 9 meshing with pinion 10 and the segment 9 isjust passing out of mesh with the pinion 10"; at the same moment the roller 5 isfljust entering the slot between the opposed shoes 3, 4 (seewFig. 6), and

The reversing roller 5 is shdwn as rotat-Q will take control of the bedand continue to move the same to the right (after segment 9 leaves gear 10*) while ear 6 makes one-' fourth of a revolution, uring this time the roller 5 in conjunction with the slot (and particularly shoe 3) gradually slows down the bed to a full stop, then owing to the continued orbital movement of the roller 5 by the gear 6, said roller operating on shoe 3, first starts the bed rack in the reverse direction and gradually accelerates the movement of the bed up to full speed by the time the gear 6 has completed a half revolution.

During the reversal movement when the bed is operating at speed the pressure contact is exe'rteglbetween' the roller 5 and the shoe 3 and the pressure is exerted with a downward component on the shoe, and while the roller 5 is in engagement with the shoe 3 the forces tending to stop or start the bed will pull the bed downward and prevent the tendency of the bed to throw upward at the end of its stroke, or during the reverse, when the machine is in normal operation' The forces tending to stop and start the bed are exerted in directions substantially at forty-five degrees to the bed.

During such reversal of the bed the pinion 10 is out of mesh with both segments 9", and 8", but is under control of the bed rack 11, which remains in mesh with the pinion 10, and therefore said pinions 1()-10 are slowed down, stopped, and reversed in rotation in, accordance with the slowing down and stoppage and reversal of the movement of .the bed; and said pinions are brought up to fully rotary speed (equal to the peripheral speed of the gears 8 and 9 laterally, or edgewise, from the position in,

which the pinion'lO" would mesh with the 11% segment 9; into suchpositionjthat said pinion will be meshed with the segmentv 8 In the interval between. the moment when segment 9 runs out of mesh with pinion 10 and thennoment when the segment 8 comes .into mesh with the pinion 10 the rotation of the pinion 10 is reversed (as stated) and when the segmentS meshes with pinion 10 to drive the same, roller 5 leaves the shoe- 3' and the bed is driven on its backward stroke by the segment 8 meshing with the v -pinion 1O and-pinion 10 meshing with the I Fig, 1 the bed is moving to the right and has just completed the uniform bed, rack 11. v

Just beforethe'end of the uniform portion of the inward stroke of the bed (that is,

just before-the segment 8 runs out. of mesh,

with the pinion 10*) the roller 5 -enterslthe f slot between the opposed shoes 3 al and;

takes control'of the bed and reverses the '1 same during th t pinion s is out roller 5 reversal thereof as mesh with both segments 8*, 9; this reversal the direction of rotation of'pinion 10 is reversed,'so that by the time the has reversed the bed and is ready to surrender control thereof the cam 12 has rocked the yoke 10 to shift pinions 10, 10 into position to enable segment 9 to again engage pinion. 10 forward stroke at uniform speed.

7 As stated the reverse roller 5 engages the related above explained. To obviate the possibility of the bed moving improperly and during this reversal movement after the roller 5, (or 5") has cleared the short 'shoe 4* (or 4 mental guard rollers 15, 15", mounted on the gears 6 and rollers 5, 5"; mounted on. a stud '15 (Fig. 2) attached to the gear '6 beside the stud 6*,froller- 15 lying close beside and partially overlapping the roller 5, and between the opposed faces, of the gear 6 and roller 5. The guide roller 15 is similarly mounted on a stud attached to the gear 7 beside the roller 5". 1

Just after-the roller 5 clearsthe shoe 4. after reversing the bed and while the roller 5 is operating on the lower part of shoe 7 beside the 3 to accelerate the reverse movement-of the bed, the guard roller 15 lightly engages or follows the curved guide 4 15* and guide 4 merely act as safety devices to keep the peripher -of the roller 5" in proper contact with the shd'e 3 during the latter part of the reversal movement; and also to enable the bed movement to be started at any point during the reverse movement at which the bed might be when the machine was stopped. Thus if the machine should be stopped during the last part of the reversing movement when roller 5 (for example) is engaged'withthe lower part ,of shoe 3, the guard roller 15 and coacting guide 4 would prevent the bed being moved inward so as to improperly separate the surface of the roller 5 from the shoe 3. And so if, at such time, it should be desired to reverse the reversal movement of the bed, then such guide roller l5 engaging the'surface 4 would move the bed outward until the roller. 5 again enters the slot betweenthe opposed shoes 3, 4 and takes control of the reverse.

Both rollers 5, 15 between the lower end of the shoes 3 and curved portion just after the segment 8 gear 10 (or 9*) so that there is no clash between the mechanisms for driving the bedon "stroke,- and the the uniform portion of. its mechanism for reversing the same at the end thereof.

The roller 5 andshoes 3 4 have the same functions and operate inlthe same man and duringner as the roller 5 and drive the bed on its slot and accomplishes the we provide supple,.

respectively As shown the, roller 15* is This roller (or 5*, 15?) .passout (or 3?) of the shoe 4 (or 4 meshes with the.

and shoes 3*, 4* above bed is being reversed at described, when the the end of its inward uniform movement or stroke, and the roller 15 the same functions and-operate in the same 7" and guide 4 have manner as roller 15 and guide 4 above described, when the bed is being reversed at the end. of its inward uniform movement.

What we claim is:

-1. In combination with a reciprocable 71 bed; a member attached thereto having two closely adjacent oppositely inclined faces arranged at an angle of less than ninety degrees to the plane of movement of said bed, said inclined faces converging toward center of the bed and inclining downwardly and outwardly away from the center of the. bed; means for driving the body uniformly during portions of its strokes; and twosimilar alternately operatin 1n en agement therewith. I

n combination with a reciprocable bed; a reversing member-secured to the bed having two oppositely inclined faces arranged at an angle of less than grees to the plane, of movement of said bed,

said inclined faces converging toward the center of the bed; and inclining downwardly and outwardly away from the center of the bed; means for uniformly moving the bed during portion of its st'ro es ;.and a pair of separated but similar rotatable members carrying means respectively adapted to ala reversing member secured to said bed and having two oppositely inclined faces ar ranged at an angle "of less than ninet grees to the plane ofmovement' of sai said inclined faces center of the-bed and inclining downwardly bed,

:and outwardly away fromthe center of the bed; and .separate rotating members each" provided'with -means which engages the re lated face of said member during the .re-

versing movement of the being in engagement with during the entire time that stopped from bed, said means the related face.

going in one direction an started in the opposite direction and until the normal speed of the bed is reached.

4. In combination a frame provided with.

ways; a bed adapted to reciprocate on said. ways; a member dependin ranged at an angleof less than ninety degrees to the plane ofmovementof said bed,

said inclined faces converging toward the center of the bed the 0 means each 35 adapted to engage the relate inclined face of said member and reverse the body while ninety de -f in combination, a reciprocable bed; 105

converging toward the 110 g the bed is being" from the bed 1 having two opposltely inc ined faces arbed; means for uniformly driving the bed on portions of its strokes; and separated rotatable gears each carrying a crank pin adapted to engage the related inclined face of'the said member and reverse the bed.

5. In a machine of the character described, in combination, a frame; a reciprocable bed an angular member connected with the bed and having oppositely inclined faces arranged at an angle of less than ninety degrees to the plane of movement of said bed, said inclined faces converging toward the center of the bed and inclining downwardly and outwardly away from the center of the bed; a fixed member opposite each inclined face and forming therewith the walls of a reversing slot; and two similar means each having a part adapted to enter one of the slots and engage the inclined face therein and stop and start the bed while in engagement therewith.-

6. In a machine of the' character described, incombination, a frame; a reciprocable bed an angular member connected with the'bed and having oppositely inclined'faces arranged at an angle of less than ninety degrees to the plane of movement o f-said bed,

said inclined faces converging toward the center of the bed and inclining downwardly and outwardly away from the center of the bed;,afixed member opposite each inclined.

face the space between such member and opposed face forming a reversing slot;and

a pair of oppositely rotating members each provided with a crank havin a part adapted to enter one ofthe slots an engage the inclined face therein. and stop and start the bed while in engagement with such face, substantially as described.

7. In combination with I a reciprocable body; a pair of closely adjacent shoes connected with said body and inclined at an angle of approximately ninety degrees to each other said shoes converging toward the center of the bed and inclining downwardly and outwardly. away from the center of the bed; with means for driviii the body at uniform speed during part of its stroke and-two rotary members at opposite sides of the uniform driving means each provided with means respectively adapted to engage one of said shoes at the end of the related uniform movement of the bed and to slow down, stop, and reverse the movement of the bed while in engagement with said shoes.

' 8. In combination with a reciprocable member; apair of adjacent shoes connected with said member and inclinedat an angle of approximately ninety degrees to each other ;'a'rack on the member; a pinion meshing with. said rack; and gearing for rotating said pinion alternately in opposite directions to drive thebed at uniform speed during part of each stroke thereof; with two rotatable members at opposite sides of the bed" driving inion provided with means respectivelya apted to engagethe related one of said shoes to slow down, stop, and reverse the movement of the bed at the end of its uniform movement in the directionof said rotary member.

9. In combination with a reciprocable form speed during part of each stroke there of; with two rotatable members at opposite sides of the bed driving pinion provided with means respectively adapted to engage' the related one of said shoes to slow down, stop, and reverse the movement ofthe bed at the end of its uniform movement in the y direction of said rotary member.

10. -Meansforv slowing down, stopping, and reversing the movement of a reciprocal body such as the bed of a printing press, comprising a long shoe attached to the body and inclined at an angle to the path of movement of the body; a short shoe fixedly attached to said body opposite the upper end of the first shoe and parallel. therewith; a rotatable crank adapted to engage the. slot between. said opposed shoes to efl'ect the reversal of the movement of the said-body;

and means to prevent disengagement of the crank from the long shoe after it has cleared the short shoe.

11. Means for slowing down, stopping, and reversing the movement of a reciprocal body such as the bed of a printing press comprising a long shoe attached to the body and inclined at an angle to the path of movement of the body; anopposed member fixedly attached to said body opposite said shoe; a short shoe attached to said member opposite the upper 'end of the first shoe and parallel therewith, the said member having a curved face on the side opposite the shoe; and a rotatable crank adapted to engage the slot between said opposed shoes to effect the reversal of the movement of the said body; and means coacting with said member to prevent disengagement of the crank from tlie longer shoe after it has cleared the short s oe.

12. In a reversing mechanism for reciprocal bodies such as the bed of a printing press; :a shoe attached to the body and inclined to the path of movement of the body; an opposed member attached to the body oppositesaid shoe and having a curved face reversal of the movement of the said body;

d, a guard means connecte w h said site said shoe and having site the shoe; a short shoe attached to sand path of movement of the crank means adapted to engage the curved member fixedly attached member opposite the upper end of the first shoe and parallel therewith; rotatable crank means adapted to engage the slot between pair of intermeshing {0nd pinion; segments carried by said gears said opposed shoes to effect the reversal of the movement of the said body; and a guard roller connected adapted to engage the curved face of said member to prevent disengagement of the crank pin from the longer shoe after thecrank has cleared the short shoe.

14. .In means for imparting reciprocatory movements to bodies such'as the bed of a printing press; the combination of a reciprocable body, pinion for driving said rack; a pair of oppositely moving segments; ing said segments simultaneously; and means for alternately meshing said pinion with said segments, thereby alternately driving the body in opposite directions. v v

15. In means for imparting reciprocatory movements to bodies such as the bed of a printing press; the combination of'a reciprocable body, pinion for driving said rack; a pair of oppositely moving segments; gearing for driving for alternately meshing said pinion with said segments, thereby alternately, driving the body in opposite directions; with means for reversing the movement ofthe'bed at each end of its uniform strokeand whilethe substantially as described. J

16. In combination a reciprocable body such as the bed of a printing press; a rack on said body; a pinion meshing with said beside the fi rst pinion pair of intermeshing gears adjacent the sec ond pinion; segments carried by said gears and means for laterally shiftin the pinions so as to causethe second pinion to alternately mesh with said segments.

17. In combination a reciprocable body' such as thebed of a printing press; a rack on said body; a pinion meshing with said ,rack;'a second vpinion beside the first pinionand slightly smaller than the first pinion; a

gears adjacent the secand means for laterally shifting the pinions movements to bodies,

rack; a

'movements to the bed ofa PllllOIl' meshing with said with said crank means a rack connected therewith; a f

each gearing for dr1v-' a rack connected therewith; a.v

printing press for oscillating the yoke so so as to cause the second pinion to alternately mesh with said segments.

18. Means for imparting reciprocatory I such as the bed of a printing press; comprising a rack attached to the body; a pinion meshing second p nion beside sald first pinion; a yoke carrying said pinions; a pair of intermeshing gears adjacent the pimons; a segment carried by each gear; and means for oscillating the yoke so as to move the pinions into positions to be alternately meshed with said segments whereby the, body is alternately moved in opposite directions.

19. Means for imparting reciprocatory printing press; to thebody; a

comprising a rack attached rack; a second with .said' pinion beside and smaller than said first pin ion; a yoke carrying said pinions; a pair of intermeshing gears adjacent the pimons; a segment carried. by each gear; and means for oscillating the yokeso as to move the pinions to be alternately meshed with said segments whereby the bed is alternately moved in opposite-directions; with means or reversing the movement of the bed at end of its uniform movement and while the pinion is disengaged from both segments, substantially asdescribed.

20. In means for'imparting reciprocatory movements to bodies, such. as the bed of printing press; the combination of a reciprocable. body, a rack connected therewith; a pinion for driving said rack; a pair ofopposltely moving segments; gearing for driving said segments simultaneously; means for alternately meshing-said pinion-with said segments, thereby alternatelyf driving the said segments simultaneously; I and means b d o y in opposite directions; gears at opposite sides of the gears carrying said segments and having. crank pins;,and shoes ioo connected withthe reciprocable body and I inclined at an angle to theplane of-movement of the body and adapted to be engaged pinion is disengaged from both segments, b

' y sa1d crank pins to reverse the movement of the'body during the time that the pinion is out of mesh with both segments; e 21. Means for imparting reciprocatory movements to bodies, such asthe bed of a to the body; a.- pinion meshing with; said rack; a second plnion beside sald first .pin-

clmed at aii'angleto the plane of of the'body; sides of and meshing with mg thesegments; and-crank means on said movement comprising a rack attached I and. gears arranged at opposite the gears gcai ryjff nected withzthe reciprocableflbody and ingears adapted to engage said shoes and reverse the movement of the body during the time that the pinion is out of mesh with both se merits;

22. 1 cans for imparting reciprocatory movements to the bed of a prmtmg press;

comprising a rack attached to the bed; a

pinion meshing with said rack; asecond pin ion beside and smaller than said first pimon; a yoke carrying said pinions; a pair oi intermeshing gears adjacent the pinions; a segment carried by each'gear; and means for oscillating the yoke so-as to move the pinions into position to be alternately meshed with said segments to move the bed alternately in opposite directions; reversing gears arranged .at opposite sides of and meshing with the gears carrying the segments; shoes connected with the bed and inclined at an angle of less than ninety degrees to the plane of movement thereof; and

crank means on said reversing gears adapted to engage said shoes and reverse the movement of the bed during the time that the pinion is out of mesh with both segments.

23. In combination with a reciprocable body, a member attached thereto having two oppositely inclined faces convergingtoward the body and arranged at an angle of less than 90 degrees to the plane of movement of said body; and means alternately cooperating with the respective inclined faces to slow down, stop, and start the body, .substantially as described.

24. Mechanism as set forth in claim 23, having said faces inclined at an angle of 45 degrees to the line of movement of the body, substantially as described.-

In combination. with body, a member attached thereto having two oppositely inclined faces converging toward the body and than 90 degrees to the plane of movement a reciprocable arranged at an angle of less of said body; means for imparting'uniform movements to the body in each direction; and means cooperating with an inclined face at each end of the uniform movement of the bed body to slow down, stop andstart the body on its return movement,- substantially as described, v y 1 26. Mechanism as set forth in claim 25, having said faces inclined at an angle oil 4:5 degreesto the line of movement of the body or; surface of the bed,

- In testimony that we claim the foregoing J as our own, we al'iin our signatures BURT F UPI-Haiti.

FRANK Pt. BELL'UO EE.,-

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