US688547A - Bed-motion for cylinder printing-machines. - Google Patents

Description

Patented Dec. I0, I90I. l G. F. READ. BED MOTION FOB CYLINDER PRINTING IIIAIIIIINES.v

(Application mea Nv. 19, 1897.)

6 Sheets-Sheet I.

l (No Model.)

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Patented Dec. l0, l90l.

` a. F. BEAD. BED MOTION FOB CYLINDER PBINTiNG MACHINES.

(Application led Nov. 19, 1897) 6 Sheets-Sheet 2.

(No Model.)

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No.' 688,547. Patented nec. lo, |901. Y u. F. READ. BED MDTiOi FORA CYLINDER PBINTINGMACHINES. (Appucunmed No. 19, 1897.) (No Model.) 6 Sheets-Sheet '3.

I l Q /WM @uw No. 688,547. Patented Dec. lo, |90I.

G. F. READ. l BED IIIDTION FUR CYLINDER PRINTING MACHINES.

(nu Maul.)

(Application led Nov. 19, 1897.)

' 6 Sheets-Sheet 4.

Patented Dec. I0, I90I. G. F. READ. BED MOTION FOR CYLINDER PRINTING MACHINES.

l (Application led Nov. 19, 1897.)

6 Sheets-Sheet 5.

(No Model.)

NIL-688,547. Patented Dec; I0, I90I.

a. F. READ. BED IIDTIUN FOR CYLINDER PRINTING MADHINES.

(Application iled Nov. 19, 1897.)

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UNIT-ED STATES PATENT OFFICE.

GEORGE F. READ, OF BROOKLYN, NEW YORK, ASSIGNOR,.BY DIRECT AND -MESNE ASSIGNMENTS,TO ROBERT HOE AND CHARLES. W. CARPENTER, OF NEW YORK, N. Y., UNDER THE FIRM-NAME OF R. HOE AND COMPANY.

BED-MOTION Foa CYLINDER eifelNriN'eNieQi-HNlas..`

vsrtaorrltinrroiv forming part of Letters Patent No. 688,547, eaten nece-unser 1o, ieoi.

Y Application led November 19,1897. Serial No. 659,127. (No model.)

To all whom may concern: embodying the invention. Fig. 2 is a sec- 5o Beit known that I, GEORGE F. READ,a cititional plan view on line 2 of Fig. 1. Fig. 3

zen of the United States, residing at Brookis a cross-sectional view on line 3 of Fig. 1.

lyn, county of Kings, and State of New York, Figs.- 4to 11 are diagrammatic views illus- 5 have invented certain new and useful Imtrating the action of the reversing movement.

provements in Bed- Motions for Cylinder Fig. 12 is a longitudinal sectional view on 55 Printing-l\/Iachines, fully described and lreplin'e 12 of Fig. 13 of a single-cylinderat-bed resented in `the following specification .and printing-machine similar to that shown in the accompanyingdrawingsformingapartof 'Figs 1', 2, and 3, but with the driving-gear Io the same. Y, arranged vertically instead of horizontally.

This invention relates particularly to jbed- Fig. 13 isa cross-sectional'view on line 13 of 6o r motions for bed-andV-cylinder printing-ma-` Fig. 12. Figs. 14 and 15 showamodified conchines, and especially to that class of' beidstruction, Fig. 14 being a view similar to Fig. motionsin which the bed is driven through 4 and Fig. 15 a cross-section on the line 15 of 15 the greater portion of its 'reciprocation in Fig. 14.

either` direction by means driving it at a unip Referring to the drawings and iirst to Figs. 65 6 form speed, preferably Aby ardriving gear- `1, 2, and 3,-the printing-machine shown 'inwheel engaging one or the other of two drivn cludes an impression-cylinder C, mounted in ing-racks carried by the bed. Y bearings 10, arranged to rise and fall' in the 2o The especial object of the inventionY is to frame A, as usual in machines of this class,

provide an improved means for reversing the for the purpose of causing the impression- 7o movement of the bed after it has made the cylinder to coaet with the bed only during greater portion of its movement in either diits forward or printing movement, which risrection under the control of the uniform driving and falling of the impression-cylinder ing means, suchreversing means operating may be caused by the usual toggle or other to graduallyslow down and stop the moveconnection with a rock-shaft 11, rocked at 75 ment of therbed in one direction and to start' :proper intervals by means of a connectingand accelerate the' same in the opposite dirod l2,`pivoted to a rock-arm 13 on said shaft rection until it has the normal speed of the 'and having bowls 14, engaged by a cam 15 3o bed as driven by the uniform driving means. on a constantly-rotating shaft'l. The im- 'Vhile the invention has been designed espression-cylinder is driven from a gear 17 on 8o peciallyv with the idea of providing an im-` the main driving-shaft 2O through an interproved means for controlling the reeiprocatmediate 18, meshing with a gear 19 on the `ing bed of Ya .bied-and-cylinder printing-macylinder-shaft. The impression-cylinder cochine, it may be employed in other eonnecoperates for printingiwith the reciprocating tions for controlling other moving parts for type or form carrying bed B of any suit- 85 which it maybe found suitable. 'able formand mounted in any suitable man- As a full understanding of the invention ner to reciprocate horizontally on the frame can best be given by a detailed description A. This bed is provided with hangers 22 22,

4o of a construction embodying all the features which carry racks 23 24, which are engaged of the same in their preferred forms, such a alternately by a continuously-rotating hori- 9o description will now be given inv connection zontaldrivinggear-wheel 25,by which the bed with the accompanying drawings,illustrating is driven for the major part of its run altersuch a construction, and the features formnately in opposite directions'. The drivinging the invention will afterward be speciiicgear 25 is carried bya vertical shaft 26, jourally pointed out in the claims. naled in a pedestal 27 and driven byabevel- 95 In said drawings, Figure 1 is a longitudigear 28 on the main driving-shaft 2O engagnal sectional View on line`1, of Fig. 2 of a ing a bevel-gear'29, carried by said drivingsingle cylinder flat bed printing machine gear.

For the purpose of causing the racks 23 and 24 to engage alternately with the drivinggear 25 for causing the reciprocation of the bed B the racks are mounted to move laterally in their hangers 22 into and out of position to engage the driving-gear, being for this purpose guided by suitable end guides 30, whereby they are prevented from moving longitudinally of the hangers, and each rack being connected by a plurality of links 3l with a rod 32, mounted to move longitudinallyin the hangers and held against lateral movement. By this arrangement the endwise movement of either of the rods 32 will through the links 3l cause its corresponding rack 23 or 24 to move laterally into or out of position to engage'the driving-gear 25, according to the direction of movement of the rod. For the purpose of moving the rods 32 endwise their ends are extended so as to en gage the ends of the supporting-frame or other suitable abntments just before the bed reaches the end of its return movement in either direction, and the links 3l are connected to the rods 32 and to the respective racks, so that the movement of the two rods in the same direction will cause the outward movement of one rack into engaging position and the inward movement of the other rack out of engaging position. As shown in Fig. 2, the bed having reached the end of its movement toward the right the rods 32 have been shifted by engagement with the end of the frame A so as to withdraw the rack 23, which during the greater portion of the movoment of the bed to the right was engaged by the driving-gear 25, and to move the rack 24 into position to the engaged by the drivinggcar 25 during the greater part ot the movement of the bed in the opposite direction or to the left in said figure.

The above-described arrangement forcausing the bed-racks to engage alternately with the driving-gear forms no part of the present invention and is shown merely as the preferred construction for this purpose, and it will be understood that any other suitable construction for causing the engagement of the bed-racks alternately with the drivinggear may be employed in connection with the features forming the invention, as claimed.

Pivotally mounted on the driving-gear 25, with its center at a point midway between the center of said gear and its pitch-circle, is a pinion 40, whose pitch-circle diameter is half that of the pitch-circle diameter of the gear 25 and which meshes With an internal gear 41, whose pitch-circle diameter is the same as that of the gear 25 and which is supported by the pedestal 27 concentrieally with the gear 25. The pinion 40 will thus by the rotation of the driving-gear 25 be caused to revolve bodily about the axis of the gear 25, and through its engagement with the internal gear 41 will bc caused to rotate about its own axis in the opposite direction to that of its revolution about the axis of the gear 25 or to that of the rotation of the gear 25, and its pitch-circle diameter being half that of the internal gear 4l it will be caused to make two such rotations about its own axis to one rotation of the gear 25. Any point on the pitchcircle of said pinion will therefore be caused to move back and forth in a straight line a distance equal tothe pitch-circle diameter of the driving-gear 25 and at a speed equal to and varying as that which would be derived from a crank of the same radius as the driving-gear 25, and a point in the pitch-circle of the pinion which coincides with a point in the pitch-circle of the internal gear 41 when the axis ot the pinion is in aplane extending through the axis of the driving-gear 25 and parallel with the direction of movement of the bed will reciprocate in a line parallel with the direction of movement of the bed, and any other point in the pinion will have a movement of revolution about a moving center, which center is this longitudinally-moving point in the pitch-circle of the pinion. At the middle point of its movement in either direction this longitudinally-moving point will move with a speed equal to that of the pitch-circle of the driving-gear or the speed at which the bed is driven by said gear, and it will move in either direction from such middle point with a gradually-deereasing velocity until it stops, and then it will move back toward such point of greatest velocity again with a gradually-increasing speed.

The pinion 40 has on its outer face a plate 42, which is formed with a groove 43, the side Walls of which extend in arcs of concentric circles whose center is coincident or in line with said longitudinally-moving point of the pinion, the sides of this groove forming opposed bearing-faces 44. At each end of the bed there is provided an abutment 45, having bearing-faces 46, extending in al'cs of circles having radii corresponding with those of the bearing-faces 44 of the pinion 40, and said abutments being arranged transversely of the direction of the movement of the bed and with their concave faces inward or facing each other.

The operation will be readily understood from Fig. 2 and the diagrammatic views, Figs. 4 to 1l. gear 25 makes three. complete rotations for each complete reciprocation of the bed-that is, for each movement of the bed fromits position at the end of its movement in one direction to the end of its movement in the other direction and back again-and the bed- racks 23 and 24 are of a length corresponding to the circumference of the driving-gear, so that the gear drives the bed in each direction during one complete rotation, leaving a half-rotation for slowing down and stopping the bed Aand starting it in the opposite direction at the end of its run in either direction. The bed is thus driven during the greater portion IIO In the machine shown the drivingof its movement in either direction at a uniform speed directly by the driving-gear 25, and between its movements in either direction it is slowed down, stopped, and started in the other direction. The bed having been thus driven through the greater portion of its movement in one direction by the drivinggear engaging one of the racks 23 24, as to the right in Figs. l and 2, by engagement of the driving-gear with the rack 23 as the rack 23 is about to be carried by the movement of the bed out of engagement with the driving-gear the pinon 40, being pivoted at the proper point circumferentiallyl ot' the driving-gear 25, will have been moved to bring the groove 43 into position to receive the end of the abutment 45, as shown in Fig. 4. Then as the rotation of the driving-gear continues in the direction indicated by the arrows the pinion 40, moving bodily with the driving-gear 25 and rotated on its own axis in the opposite direction by engagement with the internal gear 41,

as indicated by the arrows, the, longitudinally-moving point in the pitch-circle of theY pinion (indicated at a in the diagrams) is caused to move in the direction of the arrow shown in Figs. 4, 5, and 6, and the groove 43, extending concentrically about the point a, is caused to revolve about said point as it moves. The parts will thus take successively the positions indicated'in Figs. 5, 6, and 7, the abutment 45 being positively engaged by the bearing-faces 44, formed 'by the walls of the groove 43, and being thereby given a movement corresponding with the movement of the point a of the pinion. As t-he point ct in moving from the position corresponding to the axis of the driving-gear`25 moves with a gradually-decreasingspeed until it comes to rest in the position shown in Fig. 7, so the movement of the abutment 45, and therethrough of the bed B, will ybe gradually retarded until the bed is brought to rest when the parts have reached the position shown in Fig. 7. Then as the rotation of the drivinggear 25 and the movement of the pinion 40 continues the point d will begin to move from the position shown in Fig. 7 in the direction opposite to that of its former movement and with a gradually-increasing speed through the positions shown in Figs. 8 and 9 to the position shown in Fig. 10, the-bed being thereby through the engagement of the inner or curved bearing-face 44 with the abutment 45 started to move in the opposite direction and its movement gradually accelerated until when the parts have reached the position shown in Fig. 10 the bed will be .moving at its normal speed in the opposite direction to that of its former movement. As the bed B reached the end of its movement to the light, as above described, the rods 32 were shifted endwise by engagement with the frame A so as to cause the rack 23, through which the bed was driven for the greater part of itsv movement to the right to be withdrawn, and 'to cause the rack I24 to be moved laterally into position, as shown in Fig. 2, for engagement with the driving-gear, so that the parts having now come into the position shown by the diagram Fig. 10 the dri ving-gear will engage the rack 24 to cause the bed to move at a uniform speed for the greater part of its run to the left, the abutment 45 disengaging from the groove 43, as indicated by Fig. 11. When the bed has moved to the left so far that lthe rack 24 is about to be carried out of engagement with the driving-gear, the groove 43 will come into position to coact with the abutment 45 at the right end of the bed to cause the movement of the bed to be slowed down and stopped and started and accelerated in the opposite direction in the same manner as already described for the reversal of the bed at the end of its run to the right, and then the racks having been again shifted so as to vbring rack 23 again into position for engageingfaces on the pinion and to have said abutments and the groove-of about the proportionate lengths shown in the drawings, as the use of abutments with extended bearing-faces insures a more even steady operation of the reversing mechanism and less wear on the engaging parts.

It will be seen that as the function of the reversing mechanism is not to sustain the IOO speed of the bed after the bed-rack leaves the driving-gear, but to gradually slow down and stop the movement of the bed in one direction and start it moving in the other direction, fair results might be obtained by omitting entirely the outer bearing-face of the groove 43 and depending solely on the oon-Vex bearing-face, which in the construction shown forms the inner wall of the groove 43, this bearing-face engaging the concave inner face o f the abutments and acting to reverse the movement of the bed in the manner described, the inertia of the bed serving to keep the abutments in contact with the curved bearing-face. It is much preferable, however, to provide, as I have shown, opposed bearing faces on the pinion and opposed bearing-faces on the abutments, since the movement of the bed is thereby positively controlled during all the reversing movement from the time one of the racks is moved out of engagement with the drivinggear until the other of the racks comes into engagement with the driving-gear after the bed is movingA in the opposite direction, and this in itself forms an important feature of the invention. This use of opposed bearingfaces on the pinion and opposed bearing-faces IIO on the abutments is especially important in machines in which it is sometimes necessary to operate the bed by hand or in which aircushions are used, in the former of which cases the momentum will not be sufficient to carrythe bed to the end of its movement after the release of the gear-wheel from the driving-rack, and in the latter of which cases the pressure in the air-cushions may operate to overcome the momentum of the bed and stop the latter before it reaches the end of its movement.

It is evident that in place of providing the pinion with a groove 43, the walls of which form opposed bearing-faces for engaging and coacting with bearing-faces of the abutments, I might provide the pinion with a correspondingly-curved rib, the edges of which would form bearing-faces for coacting with bearing-faces formed by the walls of a groove in the abutments. The preferred construction, however, is that shown.

In Figs. 14 and 15 I have shown a construction such as above referred `to in which the pinion 40 carries in place of the groove 43 a curved rib 43', which enters and coacts with grooves 45 at the opposite ends of the bed, which form abutments corresponding to abutments 45, previously described, the bearingfaces 46 of which grooves coact with the bearing-faces 44 on opposite sides of the ribs 43 on pinion 40. The operation of this construction is obviously the same as that of the construction shownin Figs. 1 to 11 and above described.

In Figs. 12 and 13 I have shown myV in vention as embodied in a press similar to the press shown in Figs. 1 to 3, but with the drivinggear 25 arranged vertically. In the construction shown in these figures the driving-gear is carried directly by the driving-shaft 20 and carries a pinion 40, engaging an internal gear 41a and having a plate 42, provided with a curved groove 43 for engagement with curved abutmeuts 45, these parts all being substantially the same as and acting as the corresponding parts in the construction shown in Figs. 1, 2, and 3. In these figures I have shown the bed-racks as being stationary, one, 23,carried directly by the bed B,and the other, 24, carried by a hanger 22, and the racks are arranged in different vertical planes, but with their pitch-lines in the same horizontal planes, respectively, as the pitch-line of the driving-whee125a at the top and bottom of the wheel. The driving gear-wheel 25a is a compound wheel consisting of a body portion 2, having a broad periphery and a toothed rim portion 5, mounted to move on the periphery of the body portion longitudinally of its axis and caused to rotate with said body portion by means of splines 4, so that it maybe shifted into position to engage the racks 23a and 24 alternately for driving the bed alternately in opposite directions. The toothed rim portion 5 is thus moved on the body portion by means of shifting-arms 50, carried by a rockshaft 51 and having shoes 52, extending into a groove 53 in the toothed rim, the rock-shaft 51 being rocked by an arm 54, carrying a bowl or pin extending into a cam-groove 55 in the face of a cam 56, carried by the shaft 16. This shaft is driven to make one revolution to three revolutions of the driving-shaft or of the driving-gear 25, and the cam-groove 55 is formed to shift the toothed rim 5 at each half-revolution ot' the shaft 16 first in one direction and then in the other, the cam being timed so as to cause the shifting of the toothed rim between the time that one of the racks moves out of engagement with the rim and the other rack is carried by the bed into position for engagement with the rim.

It will be understood that I am not to be limited to the exact constructions shown for the purpose of illustrating the invention and to which the foregoing description has been mainly confined, but that the invention includes various modifications and changes therein within the claims.

Vhat I claim is- 1. The combination with la moving part and means for driving said part through a portion of its movement, of a memberhaving a curved bearing-face, means for revolving said member about a center concentric with the curved bearing-face and moving in a substantially straight line longitudinally of the directions of movement of said moving part at a decreasing speed, and an abutment on said moving part coacting with said curved bearing-face to slow down the movement of the moving part, substantially as described.

2. The combination with a moving part and means for driving said part through a portion of its movement, of a member having a convex curved bearing-face, means for revolving said member about a center concentric with the curved bearing-face and moving in a substantially straight line longitudinally of the direction of movement of said moving part at a decreasing speed, and an abutment on said moving part coacting with said curved bearing-face to slow down the movement of the moving part, substantially as described.

3. The combination with a reciprocating part and means for driving said part throughout the greater portion of its movement in either direction, of a member having a curved bearing-face, means for revolving said member about a center concentric with the curved bearing -face and having a reciprocating movement inv a substantially straight line longitudinally of the direction of movement of the reciprocating part at successively decreasing and increasing speeds, and an abutment on said reciprocating part coacting with said curved bearing-face to slow down and arrest the movement of the reciprocating part in one direction and start and accelerate it in the other direction, substantially as described.

4. The combination with a reciprocating part and means for drivingsaid part throughout the greater portion of its movement in either direction, of a member having a convex curved bearing-face, means for revolving lsaid member about a center concentric with the curved bearing-face and having a reciprocating movement in a substantially straight line longitudinally oij the direction of movement of the reciprocating part at successively decreasing and increasing speeds, and an abutment at each end of the reciprocating part coacting with said curved bearing-face to slow down and arrest the movement-fof the reciprocating part in one direction and start and accelerate it in the other direction, substantially as described.

5. The combination with a reciprocating part and means for driving said part throughout the greater portion of its movement in either direction, of a member havinga curved bearing-face, means `for revolving said member about a center concentric with the curved bearing face and having a reciprocating movement longitudinally of the direction of movement of the reciprocating part at successively decreasing and increasing speeds,

and an abutment on said reciprocating part havinga bearing-face extending transversely of the direction of movement of the reciprocating part and curved to correspond 'to said curved bearing-face of the revolving member for coacting therewith to slowdown and arrest the movement of the reciprocating part in one direction and start and accelerate itin the other direction, substantially as described.

6. The combination with a reciprocating part and means for driving said part through- 'out the greater portion of its movement in either direction, of a member having concentric opposed curved bearing-faces, means for revolving said member about a center concentric with the curved bearing-faces and having a reciprocating movement longitudinally of the direction of movement of the reciprocating part at successively decreasing and increasing speeds, and an abutment on said reciprocating part for coactin g with said curved bearing-faces on the revolving member to slow down and arrest the movement of the reciprocating part in one direction and start and accelerate .it in the other direction., substantially as described.

7. The combination with a reciprocating part andmeans for driving said part throughout the greater portion of its movement-in either direction, of a member having concentric opposed curved bearing-faces, means for revolving said member about a center concentric With the curved bearing-faces and having a reciprocating movement longitudinally of the direction of movement of the reciprocating part at successively decreasing and increasingV speeds, and an abutment on said reciprocating part having opposed bearing-faces extending transversely of the direction o' movement of the reciprocating part and curved to correspond to said curved bearing-faces of the revolving member for coacting therewith to slow down and arrest the movement ol the reciprocating part in one direction and start and accelerate it in the other direction, substantially as described.

8. The combination with a reciprocating part and means for driving said part throughout the greater portion of its movement in either direction, of a member having a groove the side walls of which form concentric opposed curved bearing-faces, means for revolving said member about a center concentric with said curved bearing-faces and having a reciprocating movement longitudinally of the direction of movement of the reciprocating part at successively decreasing and increasing speeds, and an abutment on said reciprocating part the outer side' walls ot' which form opposed bearing-faces extending transversely of the direction of movement of the reciprocating part and curved to correspond to said curved bearing-faces of the revolving member for coacting therewith to slow down and arrest the movement of the reciprocating part' in one direction and start and accelerate it in the other direction, substantially as described.

9. The combination with a reciprocating part and means for driving said part throughout the greater portion of its movement in either direction, of a member pivoted to a r0- tating part and means for rotating said member in the opposite direction to that of said rotating part, whereby said member is caused to revolve about a center which reciprocates in a substantially straight line longitudinally of the direction of movement of the reciprocating part, a convex bearing-face on said member extending concentrically about said IOO center, and an abutment on the reciprocating..4

part forl coacting with said bearing-face to slow down and arrest the movement of the reciprocating part in one direction and start and accelerate it in the other direction, substantially as described.

10. The combination with a reciprocating part and means for driving said part throughout the greater portion of its movement in either direction, of a member pivoted to a rotating part and means for rotating said member in the opposite direction to that of said rotating part, whereby said member is caused to revolve about a center which reciprocates longitudinally of the direction of movement of th'e reciprocating part, a convex bearingface on said member extending concentrically about said center, and an vabutment on the reciprocating part having a concave bearingface extending transversely of the direction of movement of the reciprocating part and curved to correspond to thebearing-face on said member for coacting therewith to slow down and arrest the movement of the reciprocating-part in one direction and start and accelerate it in the other direction, substantially described.

l1. The combination with a reciprocating part and means for driving said part through- IIO out the greater. portion of its movement in either direction, of a member pivoted to a rotating part and means for rotating said member in the opposite direction to that of said rotatingr part, whereby said member is caused to revolve about a center which reciprocates longitudinally of the direction of movement of the reciprocating part, concentric opposed bearing-faces on said member extending concentrically about said center, and an abutmenton the reciprocating part havingopposed bearing-faces extending transversely of the direction of movement of the reciprocating part and curved to correspond to the bearingfaces on said member for coacting therewith to slow down and arrest the movement of the reciprocating part in one direction and start and accelerate it in the other direction, substantially as described.

12. The combination with a reciprocating part and means comprising a rack and a driving gear-wheel for driving said part throughout the greater portion of its movement in either direction, of a pinion pivoted to said driving-wheel, a fixed internal gear engaging said pinion, aconvex bearing-face on said pinion extending concentrically about a point that reciprocates in a substantially straight line longitudinally of the direction of movement of the reciprocating part, and an abutment on the reciprocating part for coacting with said bearing-face to slow down and arrest the movement of the reciprocating part in one direction and to start and accelerate it in the other direction, substantially as described.

13. The combination with a reciprocating` part and mean's comprising a rack and a driving gear-wheel for driving said part throughout the greater portion of its movement in either direction, of a pinion pivoted to said driving-wheel, a fixed internal gear engaging said pinion, concentric opposed bearing-faces on said pinion extending concentrically about a point that reciprocates longitudinally of the direction of movement of the reciprocating part, and an abutment on the reciproca-ting part having opposed bearing-faces extending transversely of the direction of movement of the reciprocating part and curved to correspond to the bearing-faces of the pinion for coacting therewith to slow down and arrest the movement of the reciprocatingpart in one direction and start and accelerate it in the other direction, substantially as described.

14. The combination with a reciprocating part and means comprising a rack and a driving gear-wheel for driving said part throughout the greater portion of its movement in either direction, ot' a pinion pivoted to said driving-wheel, a fixed internal gear engaging said pinion, a convex bearing-face on said pinion extending concentrically about a point that reciprocates in a substantially straight line longitudinally of the direction of movement of the reciprocating part, and an abutment at each end of the reciprocating part for coacting with said bearing-face to slow down and arrest the movement of the reciprocating part in one direction and start and accelerate it in the other direction, substantially as described.

l5. The combination with a reciprocating part and means comprising a rack and a driving gear-wheel fordriving said part throughout the greater portion of its movement in either direction, of a member pivoted to said driving-wheel and means for rotating said member in thc opposite direction to that of the driving-wheel, whereby said member is caused to revolve about a center which reciprocates in a substantially straight line longitudinally ot' the direction of movement of the reciprocating part, a convex bearing-face on said member extending concentrically about said center, and an abutment on the reciprocating part for coacting with said bearing-face to slow down and arrest the movement of the reciprocating part in one direction and start and accelerate it in the other direction, substantially as'described.

16. The combination with a reciprocating part and means comprising a rack and a driving gear-wheel for driving said part throughout the greater portion of its movement in either direction, of a member pivoted to said driving-wheel and means for rotating said member in the opposite direction to that of the driving-wheel, whereby said member is caused to revolve about a center which reciprocates longitudinally of the direction of movement of the reciprocating part, concentric opposed bearing-faces on said member extending concentrically about said center, and an abutment on the reciprocating part for coacting with said bearing-faces to slow down and arrest the movement of the recip-V rocating part in one direction and start and accelerate it in the other direction, substantially as described.

17. The combination ofa reciprocating part, a pinion 40 pivoted to a rotating part and having a convex bearing-surface 44 eccentric to the pitch-line of the pinion, means for revolving the pinion about a center concentric with said face 44, a stationary internal gear 41 meshing with pinion 40, an abutment on said reciprocating part having a concave bearingface 46 coactin g with the convex bearing-face 44, and means independent of said pinion for driving said reciprocating part through a portion of its movement, substantially as described.

18. The combination of a reciprocating part, a pinion 40 pivoted to a rotating part and having concentric opposed curved bearing-faces 44, a stationary internal gear 4l meshing with pinion 40, and an abutment on said reciprocating part having opposed curved bearingfaces 46, substantially as described.

19. The combination of a reciprocating part, a pinion 40 pivoted to a rotating part and hav- IOO IIO

ing a groove 43 the side Walls of which form In'testimony whereof I have hereunto set concentric opposed curved bea1ingfaees 44, my hand in the presence of two subscribing :i stationary internal gear 4l meshing with Witnesses. pinion 40, and an abutment onsaid reeipro- 5 eating part the outer side Walls of which form I Witnesses:

opposed curvedbearing-faces46,substantiaily F. W. H. CRANE, as described. Y l E. L. SPEIR.

GEORGE F. READ.

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