US1293505A - Mechanical movement. - Google Patents

Description

R. MIEHLE. MECHANICAL-MOVEMENT. APPLICATION FILED NOV. 1a. 1915.

Patented Feb. 4, 1919.

2 SHEETS-SHEET l.

Qg! LU VENT R. fiZer/i/z%/a ATTORNl-I R. MIEHLE.

MECHANICAL MOVEMENT.

APPLICATION HLED NOV. 18, 1916.

1,293,505, Patenteti Feb/1, 1919.

2 SHEETS--SHEET 2 INVENTOR.

gm 0?? ATTORNEY ROBERT MIEI-ILE, OF CHICAGO, ILLINOIS.

MECHANICAL MOVEMENT.

wastes.

Application filed November 18, 1916.

To all whom it may concern:

Be it known that 1, ROBERT MIEHLE, citi- Zen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Mechanical Movements, of which the following is a full, clear, concise, and exact description.

My invention relates to mechanical-movements employed to effect reciprocable travel of reciprocable elements and in one aspect resides in the employment of one block taking part in initiating reciprocable movement and another block for completing reciprocable movement, these blocks having novel interrelation with complemental means for moving the reciprocable element. In another aspect one, and preferably each, block is not in rotation as it performs its function. A construction made in accordance with the preferred embodiment of the invention employs any suitable mechanism for effecting intermediate portions of the strokes, mechanism for beginning the reciprocating strokes of said element that is inclusive of two concave cam tracks coupled with the reciprocable element and whose concave faces are opposed and an actuating block mounted to turn and movable along the concave faces of said tracks, and mechanism for finishing reciprocating strokes of said element that is inclusive of two symmetrically arranged convex cam tracks coupled with the reciprocable element and an actuating block mounted to turn independently upon the same mounting for the other block and movable along the convex faces of these tracks that are disposed between and form with the aforesaid concave tracks slots in which both blocks move together.

I will explain my invention more fully by reference to the accompanying drawings showing the preferred embodiment thereof as applied to a cylinder printing press but to which use the invention is not to be limited. In the drawings Figure 1 is a view in elevation, partially broken away, of mechanism constructed in accordance with the invention; Fig. 2 is a view in end elevation of a part of the apparatus, aportion of this view being taken on line 22 of Fig. 1; Fig. 3 is-a view of a part of the structure taken on line 33 of Fig. 1; Fig. 4 is a view similar to Fig. 3 excepting that more structural. parts are shown in this figure; and

Figs. 5, 6 and 7 are views illustrating dif- Specification of Letters Patent.

Patented Feb. a, 1919. Serial No. 132,079.

ferent operating positions of the mechanism of my invention.

Like parts are indicated by similar characters of reference throughout the different figures.

The element to be reciprocated is shown as being in the form of a bed 1 and con tlguous parts that pertain to a reciprocating bed and cylinder printing press. Any suit able mechanism may be employed for reciprocatmg the bed 1 throughout the major and intermediate parts of its reciprocating movements, the mechanism for effecting the major portions of these reciprocating movements of the bed being any that is suitable and forming no novel part of my present invention. A suitable mechanism which I have illustrated for this purpose is inclu sive of two rack bars 2 and 3 that face each other and are in the same vertical plane. these rack bars being in fixed relation to the bed. The rack bars are alternately engaged by a segmental gear 4 that is illustrated as having a fixed axis of rotation, this segmental gear being in fixed relation to a drivng shaft 5, upon which driving shaft there 1s also illustrated a spur gear 6 meshing with a printing cylinder operating spur gear 7 of the printing press. The printing cylinder 8 is indicated by the dotted circle in Fig. 1. The segmental gear 4- is of such peripheral length that when it engages the rack bar 2 it will move the bed 1 to the left but will not begin the stroke to the left-nor end it, this stroke being begun and ended by constructions of my present invention.

The segmental gear 4 when engaging the rack bar 3 will move the bed 1 to the right but will not begin the stroke to the rightnor end it, this stroke being begun and ended by the aforesaid constructions of my invention.

One gearing for effecting the intermediate portions of the reciprocating strokes of the bed is illustrated in my Patent N o. 7 38,829, dated September 15, 1903, though there is other gearing in existence which will accomplish this purpose.

The mechanism for beginning each stroke is inclusive of the block 9, rotatably mounted on the crank pin 12, which is carried by the shaft 5, operating upon and between the upright cam tracks 10 and 11 coupled with the bed 1 which are carried by the bed 1. The engaging faces of the cam tracks 10 and 11 are concave, opposed and symmetrically arranged, the curvatures of these tracks being similar. The face 1 1 of the block 9 engages the track 10 to start the movement of the bed 1 to the left, continuing the inccption of such movement until the rack bar 2 has been moved sufficiently far to the left to enable the segmental gear 4, which is also carried by shaft 5, that is moving upwardly to engage this rack to continue the left hand movement of the bed, the co'acting gear 4 and rack 2 finishing the intermediate portion of the travel of the bed to theleft. The convex face 14: of the block 9 is substantially of the same degree of curvature as the engaging curved concave face of the track 10. As the gear 1 leaves the rack 2 on the leftward n'iovement of the bed 1 the block 15, rotatably mounted upon the crank pin 12, engages the upright cam track 16, coupled with bed 1, to finish the leftward stroke. lVhen the leftward stroke is finished the convex face 17 of the block 9 engages the truck 11 to start the movement of'the bed 1 to the right and to continue the inception of such movement until the rack bar 3 has been moved sufficiently far to the right to enable the segmental gear 4 that is now moving downwardly to engage this rack 3 to continue the right hand movement of the bed 1, the co-actine; gear 4L and rack 3 finishing the intermediate portion of the travel of the bed to the right. The convex face 17 of the block 9 is of'the same degree of curvature as the concave curvature of the track 11. While the convex curvatures of the faces 14 and 17 of the block 9 and the concave curvatures of the tracks 10 and 11 are desirably similar, or of similar degree it is apparent that it is only essential to have each face 11,-

17, of the block 9 conform to the concave face of the track engaged thereby. When the gear fl: leaves the'rack 3 on the right ward movement of the bed 1 the block 15 engages the upright cam track 18, coupled with bed 1, to finish the rightward stroke of the bed 1 and after finishing this movement the face 1% of the block 9 again engages the upright cam track 10 to start the next cycle of reciprocating movements of the bed 1. The tracks 16 and 18 are disposed between thetracks 10 and 11, slots thus intervening between the outer and inner tracks in which said blocks move. Inasmuch as the same concave surface of the block 15 engages the tracks 16 and 18 the engaging faces of these tracks are convex and of similar curvature and are essentially synnnctrically arranged. By reference to Fig. 4, it will be observed that the cam tracks 10 and 11 and the block9 alternately cooperating therewith are in one plane and that the cam tracks 16 and 18, and the block 15 alternately cooperating with. these latter cam tracks are in another and distant plane whereby the cam tracks which pertain to each block will not interfere with the movements of the other block. The axis of the block 9 is disposed in a plane perpendicular to the path of aid block and midway between the ends of the cam trackengaging faces 14: and 17 of the block, and said block 9 is transferred from engagement with the upper end of the upright cam track 10 to engagement with the upper end of the upright cam track 11 during the co-action of the gear 4 and rack 2, the upper end of the track 11 serving to turn the block 9 in a counter-clockwise direction to bring the face 17 of the block 9 into engagement with the track 11. The block 9 is transferred from engagement with the lower end of the upright cam track 11 to engagement with the lower end of the upright cam track 10 during the co-action of the gear 4: and rack 3, the lower end of the track 10 serving to turn the block 9 again in a counterclockwise direction to bring the face 1a of the block 9 again into engagement with the track 10. The movement ofthe block 9 about its axis beyond the extent permitted by the tracks 10 and 11 is prevented owing to the extension of the track engaging faces 14 and 17 of the block in the plane of travel of such block, these extended surfaces conforming to the engaging faces of the cam tracks so that there is no turning of the block 9 upon its axis while engaging the earn track except that which is occasioned in having the block follow the curvature of the track it engages.

The upper ends of the cam tracks 16 and 18 meet in an edge as do. their lower ends. The axis of the block 15 is preferably disposed coaxial with that of block 9, the axis of said block 15 being disposed in a plane perpendicular to the path of this block and at a point midway between the ends of the cam track engaging face thereof, and said block 15 is transferred from engagement with the upper end of the upright cam track 18 to engagement with the upper end of the upright cam track 16 during the co-action of the gear 1 with the rack 2, the upper end of the track 18 serving to turn the block 15 in a clockwise direction to bring the concave track engaging surface of the block 15 into engagement with the track 16. The block 15 is transferred from engagement with the lower end of the upright cam track 16 to engagement with the lower end of the upright cam track 18 during the co-action of the gear 4 with the rack 3, the lower end of the track 16 serving to turn the block 15 in a clockwise direction to bring the concave track engaging surface of the block 15 into engagement with the track 18, these results occurring while the gear 4 and rack 3 are in mesh. The block 15 thus has a form of planetary motion, the movement of this block about its axis being slight when at gaging either track 16 or 18, the extent of" such movement depending upon the curvature of the engaging track, While the movement of this block is accentuated when it rounds the ends of the tracks. Movement of the block 15 about its axis beyond the extent permitted by the tracks 16 and 18 is prevented owing to the extension of the track engaging face of the block in the plane of travel of such block, this extended surface conforming to the engaging faces of the cam tracks 16 and 18 so that there is no turning of the block 15 upon its axis while engaging a cam trackexcept that which is occasioned in having the block follow the curvature of the track it engages.

The blocks of my construction have extended engagement with the cam tracks and are not subject to much wear so that they may perform their functions of beginning and ending reciprocating strokes of the load 1 without lost motion and without impairing the entry of the gear 4 into mesh with the racks 2 and 3. These advantages are secured while retaining the general purpose for which the blocks are employed, namely the smooth and gradual finishing and initiation of the reciprocating strokes of the load or reciprocable element 1. \Vhile the blocks are in engagement with their cam tracks there is not much movement of the blocks upon the crank pin or stud 12, this be ing so while the blocks are performing their load moving function. When the blocks are not under load they may be turned freely upon the crank pin 12. The crank pin is therefore not subject to much wear due to rotary movement of the blocks and in order that this limited amount of wear may be reduced as much as possible the crank pin is made of much larger diameter than would be possible if rollers were employed instead of the blocks.

While I have herein shown and particularly described the preferred embodiment of my invention I do not wish to be limited to the precise details of construction shown as changes may readily be made without departing from the spirit of my invention, but having thus described my invention I claim as new and desire to secure by Letters Patcut the following:

1. The combination with a reciprocable element; of mechanism for beginning a reciprocating stroke of said element that is inclusive of a concave cam track coupled with the reciprocable element and an actuating block mounted to turn and movable along the concave face of the track and in actuating relation to the track to force initial movement of the reciprocable element coupled with the track, the face of said block engaging the concave face of the track being extended in the plane of movement of the block; and means for continuing the motion of the reciprocable element initiated by the block.

2. The combination with a reciprocable element; of mechanism for beginning a reciprocating stroke of said element that is inclusive of a concave cam track coupled with the reciprocable element and an actuating block mounted to turn and movable along the concave face of the track and having a convex track engaging surface having substantially the same degree of curvature as said concave track face and cooperating with said track to force initial movement of the reciprocable element; and means for continuing the motion of the reciprocable element initiated by the block.

3. The combination with a reciprocable element; of mechanism for beginning the reciprocating strokes of said element that is inclusive of two concave cam tracks coupled with the reciprocable element and whose concave faces are opposed and a multifaced actuating block mounted to turn and alternately movable along the concave faces of said tracks and in actuating relation to the tracks to force initial movement of the reciprocable element coupled with the tracks, one face of said block being engageable with the concave face of one track and another face of said block being engageable with the concave face of the other track, there being means whereby the block is shifted from engagement with one track into engagement with the other, the track engaging faces of said block being extended in the plane of movement of the block; and means for completing each reciprocating stroke of the reciprocable element.

4. The combination with a reciprocable element; of mechanism for beginning the reciprocating strokes of said element that is inclusive of two concave cam tracks coupled with the reciprocable element and whose concave faces are opposed and a mu1- tifaced actuating block mounted to turn and alternately movable along the concave faces of said tracks and in actuating relation to the tracks to force initial movement of the reciprocable element coupled with the tracks, one face of said block being engageable with the concave face of one track and another face of said block being engageable with the concave face of the other track, there being means whereby the block is shifted from ongagement with one track into engagement with the other, the elongated faces of said block being convex and conforming in our vature to the concave track faces engaged thereby; and means for completing each reciprocating stroke of the reciprocable element.

5. The combination with a reciprocable element; of mechanism for beginning the reciprocating strokes of said element that is inclusive of two concave cam tracks coupled with the reciprocable element and whose concave faces are opposed and a multifaced actuating block mounted to oscillate and alternately movable along the concave faces of said tracks and in actuating relation to the tracks to force initial movement of the reciprocable element coupled with the tracks, one face of said block being engageable with the concave face of one track and another face of said block being engageable with the concave face of the other track, there being means whereby the block is turned from engagement with one track into engagement with the other, the track engaging faces of said block being extended in the plane of movement of the block; and means for completing each reciprocating stroke of the reciprocable element.

6. The combination with a reciprocable element; of mechanism for beginning the reciprocating strokes of said element that is inclusive of two concave cam tracks coupled with the reciprocable element and whose concave faces are opposed and a multifaced actuating block mounted to oscillate and alternately movable along the concave faces-of said tracks and in actuating relation to the tracks to force initial movement of the reciprocable element coupled with the tracks, one face of said block being engageablewith the concave face of one track and another face of said block being engageable with the concave face of the other track, there being means whereby the block is turned from engagement with one track into engagement with the other the elongated faces of said block being convex and conforming in cur vature to the concave track faces engaged thereby; and means for completing each reciprocating stroke of the reciprocable element.

7 The combination with a reciprocable element; of mechanism for beginning the reciprocating strokes of said element that is inclusive of two concave cam tracks coupled with the reciprocable element and whose concave faces are opposed and a multifaced actuating block mounted to oscillate on an axis disposed between the ends thereof and alternately movable along the concave faces of said tracks and in actuating relation to thetracks to force initial movement of the reciprocable element coupled with the tracks, one face of said block being engageable with the concave face of one track and the other face of said block being engageable with the concave face of the other track, the end of each track initially engaged by the block serving to engage the block to turn it into engagement with such track, the elongated faces of said block being convex and conforming in curvature to the concave track faces engaged thereby; and means for completing each reciprocating stroke of the reciprocable element.

8. The combination with a reciprocable element; of mechanism for beginning the lcciprocating strokes of said element that is inclusive of two concave cam tracks coupled with "the reciprocable element and whose concave faces are opposed and a multifaced actuating block mounted to oscillate on an axis disposed between the ends thereof and alternately movable along the concave faces of said tracks and in actuating relation to the tracks to force initial movement of the reciprocable element coupled with the tracks, one face of said block being engageable with the concave face of one track and another face of said block being engageable withthe concave face of the other track, the end of each track initially engaged by the block serving to engage the block to turn it into engagement with such track; beingextended in the plane of movement of the block; and means for completing each reciprocating stroke of the reciprocable element.

9. The combination with a reciprocable element; of mechanism for beginning the reciprocating strokes of said element that is inclusive of two concave cam tracks coupled with the reciprocable element and whose concave surfaces are opposed and a multifaced actuating block mounted to turn and alternately movable along the concave faces of said tracks and in actuating relation to the trac {S to force initial'movement of the reciprocable element coupled with the tracks, one face of said block being engageable with the corresponding concave face of one track and the other face of said blockbeing engageable with the concave face of the other track, there being means coupled with the reciprocable element whereby the block is shifted from engagement with one track into engagement with the other; and means for completing each reciprocating stroke of the reciprocable element.

10. The combination with a reciprocable element; of mechanism for beginning the reciprocating strokes of said element that is inclusive of two concave cam tracks coupled with the reciprocabie element and Whose concave faces are opposed and a multifaced actuating block mounted to turn and alternately movable along the concave faces of said tracks and in actuating relation to the tracks to force initial movement of the reciprocable element coupled with the tracks, one face of said block being engageable with the concave face of one track and another face of said block being engageable with the concave face of the other track there being means coupled with the reciprocable element whereby the block is shifted from engagement with one track into engagement with the other, the elongated faces of said block being convex and conforming in .curvature to the concave track faces engaged thereby; and means for completing each reciprocating stroke of the reciprocable element.

11. The combination with a reciprocable element; of mechanism for beginning the reciprocating strokes of said element that 18 inclusive of two concave cam tracks coupled with the reciprocable element and whose concave faces are opposed and a multifaced actuating block mounted to oscillate and alternately movable along the concave faces of said tracks and in actuating relation to the tracks to force initial movement ofthe reciprocable element coupled with the tracks, one face of said block being engageable with the concave face of one track and another face of said block being engageable with thge c011- cave face of the other track, there being means whereby the block isturned from engagement with one track into engagement with the other. the track engaging faces of said block being extended in the plane of movement of the block: and means for completing each reciprocating stroke of the reciprocable element.

12. The combination with a reciprocable element: of mechanism for beginning the reciprocating strokes of said element that is inclusive of two concave cam tracks coupled with the reciprocable elementand whose eoncave faces are opposed and a multifaced actuating block mounted to oscillate and alternately movable along the concave faces of said tracks and in actuating relation to the tracks to force initial movement of the reciprocable element coupled with the tracks, one face of said block being engageable with the concave face of one track and another face of said block being engageable with the concave face of the other track. there being means coupled with the reciprocable element where by the block is turned from engagement with one track into engagement with the other, the elongated faces of said block being convex and conforming in curvature to the concave track faces engaged thereby; and means for completing each reciprocating stroke of the recinrocable element.

13. The combination with a reciproca-ble element: of mechanism for beginning the reciprocating strokes of said element that is inclusive of two concave cam tracks coupled with the reciprocating element and whose concave surfaces are opposed and an actuating block movable in an elongated closed path relatively to said tracks 'and in the plane of the same and having a plurality of cam track engaging faces and mounted to turn on an axis disposed perpendicular to the plane of said the ends of such faces said block being in actuating relation to the'tracks to force initial movement of thereciprocableelement coupled with the tracks said several faces of said block being engageable with one or the other cam face in regular order as said block moves through corresponding portions of its path, said cam faces of'said tracks bepath and midway between ing disposed to retain control over the block relatively to its turning movement at the ends of said path and adapted to positively positionsaid block with one face in alinement with the cam face to be engaged thereby as said block passes from engagement with one cam face into engagement with the other: and means for completing each reciprocating stroke of the reciprocative element.

14. In combination with an elongated block moving in an elongated closed path and mounted to turn on an axis perpendicular to the plane of said path and disposed at a point midway between the ends of the block; a pair of opposed facing concave cam tracks disposed. to be engaged by the respective elongated sides of said block as it moves along the respective elongated portions of its path, the corresponding ends of said cam tracks being spaced to allow passage of the block therebetween and so disposed relatively to the disposition of said axis at the respective ends of said path that said block is engaged by the cam track along which said block is about to pass and turned on its axis in a direction to bring the respective elongated side thereof into alinement with the cam track about to be engaged thereby upon the initial movement of said block upon corresponding elongated portion of its path. 7

15. In combination with an elongated block moving in an elongated closed path and mounted to turn on an axis perpendicular to the plane of said path and disposed midway between the ends of the block; a pair of opposed facing concave cam tracks disposed to be engaged by the respective elongated sides of said block as it moves along respective elongated portions of its path, the portions of said cam tracks opposite the ends of said path being so disposed. relatively to the disposition of said axis at the respective ends of said path that the block is engaged by the cam track along which the block is about to pass at a point outwardly of said axis upon the initial movement of said block along the corresponding portion of its path to bring the respective elongated side of said block into alinement with said cam track.

16. In combination with an elongated block moving in an elongated path and mounted to turn on'an axis perpendicular to the plane of said path, and disposed midway between the ends of the block; a pair of opposed facing concave cam tracks disposed to be engaged by the respective elongated sides of said block as it moves along the respective elongated portions of its path, the portions of said cam tracks corresponding with the ends of said path being disposed to control the rotation of said block and to turn said block to bring the respective elongated side of said block into alinement with the cam track about to be: engaged thereby.

17. The combination with a reciprocable element; of mechanism for beginning a reciprocating stroke of said element that is inelusive of a convex cam tract coupled with the reciprocable element and an actuating block mounted to turn and movable along the convex face of the track and in actuating relation to the track to force. initial movement of the reciprocahlc element. coupled with the tack, the face. of said block on gaging the convex face of the track being extended in the plane of movement of the block; and means for continuing the mo:- tion of the reciprocable element.

18. The combination with a reciprocable element of mechanism taking. part in effect.- ing reciprocable movements. of said ele.- ment; and mechanism for finishing av reciprocating stroke of said element. thatv is inclusive of aconvex cam track coupled with the reciprocable element. and an actuating block mounted to turn and movable: along the convex face of the track and in actuating relation to the track to force finishing movement of the reciprocable element, the face of said block engaging thev convex face of said track being extended in the plane of movement of the block.

19. The combination with a reciprocable element; of mechanism taking part in of fecting reciprocable movements of said element; and mechanism for finishing a reciprocating stroke of said element that is inclusive of a convex cam track coupled with the reciprocable element and an actuating block mounted to turn and movable.

along the convex face of the track and having a concave track engaging surface having substantially the same. degree of curvature as said convex track face. and cooperating with said track to force finishing movement of said reciprocable element.

20. The combination with a reciprocable element; of mechanism taking part in effecting reciprocable movements. of said element; and mechanism for finishing reciprocating strokes of said element that is inclusive of two symmetrically arranged convex cam tracks coupled with the reciprocable element and an actuating block mounted to turn and alternately movable along the convex faces of said tracks and in actuating relation to the tracks to force finishing movements of the reeiprocable. element, the track engaging face of said block being extended in the plane of movement of the block, there. being means for transferring the block from. engagement with each track to engagement with the other..

21. The combination with a reciprocable element; of mechanism taking part in effecting reciprocable HlOVBll'lGlltS of said element; and mechanism for finishing reciprocating strokes of said. element that inclusiveof two symmetrically arranged. convex cam tracks coupled with the reciprocable element and an actuating block mount ed to turn and alternately movable along the convex faces of said tracks and having a concave track engaging surface conforming in curvature to said convex track faces and cooperating with said tracks. to force finishing movements of said reciprocable element, there being means for transferring the block from engagement with each track to engagement with the other.

22. The combination with a reciprocabzle element; of mechanism taking part in effecting reciprocable movement of said element; and mechanism for finishing recip. rooting strokes. of said element. that isv inclusive of two symmetrically arranged convex cam tracks: coupled with the. reciprocable element and an actuating block alternately movable along the convex faces of said tracks, and. in actuating: relation to the tracks to force finishing,movementsof the reciprocablc elementmounted to turn on an axis disposed perpendicular to the plane of movement thereof and at a point. midway between the ends. of said track engaging face, the track engaging face. of said block being extended in the. plane. of movement of the block, the end of each trackv last engaged by the block operating to turn the block to. transfer the track engaging face thereof from. engagement with this track into engagement with the other track.

The. combination with a reciprocable element; of mechanism. taking part: in effect ing reciprocable movements of said element and mechanism for finishing reciprocating strokes of said element that is inclusive of two symmetrically arranged convex. cam tracks coupled with the reciprocableelement and an actuating block alternately movablealong the. convex faces of said tracks and having a concave track engaging surface conforming in curvature to said convex track faces and cooperating with said tracks to force finishing movements of said reciprocable element, mounted to turn on an axis disposed perpendicular to the plane of movement thereof and at a point n'iidway between. the ends of said: track engaging face, the. end of said track last engaged by the block operating to turn the block to transfer the track. engaging facev thereof from engagement with this track into engagement. with. the other track.

24. The (JOli'lblIlltlOH with a reciprocable element; of mechanism taking part in effecting recip rocable movements of said element; and mechanism for finishing reciprocating strokes. of said element that is inclusive of two synnnetrieally arranged convex cam tracks. coupled with the. reciprocable elementv and anact'uating block. mounted to turn and alternately movable along the convex faces 'of said'track's and in actuating relation to the tracks to force finishing inovcments of the reciprocable element the track engaging face of said block being extended in the plane of movement of the block there being means coupled with the reciprocating ele ment for transferring the block from engagement with each track to engagement with the other.

25. The combination with a reciprocable element; of mechanism taking part in effecting reciprocable movements of said element; and mechanism for finishing reciprocating strokes of said element that is inclusive of two symmetrically arranged convex cam tracks coupled with. the reciprocable element and an actuating block mounted to turn and alternately movable along the con vex faces of said tracks and having a con cave track engaging surface conforming in curvature to said convex track faces and cooperating with said tracks to force finishing movements of said reciprocable element, there being means coupled with the reciproeating element for transferring the block from engagement with each track to engage ment with the other.

26. The combination with a reciprocable element; of mechanism taking part in effecting reciprocable movements of said element; mechanism for beginning the reciprocating strokes of said element that is inclusive of two concave cam tracks coupled with the reciprocable element and whose concave faces are opposed and an actuating block mounted to turn and "alternately movable along the concave faces of said tracks; and mechanism for finishing reciprocating strokes of said element that is inclusive of two symmetrically arranged convex cam tracks coupled with the reciprocable ele ment and an actuating block mounted to turn independently upon the same mount ing for the other block and alternately movable along the convex faces of these tracks which are disposed between and form with the aforesaid concave track slots in which both blocks move together.

27. The combination with a reciprocable element; of mechanism taking part in effecting reciprocable movements of said element; mechanism for beginning the reciprocating strokes of said element that is inclusive of two concave cam tracks coupled with the reciprocable element and whose concave faces are opposed and an actuating block mounted. to turn and alternately movable along the concave faces of said tracks; and mechanism for finishing reciprocating strokes of said element that is inclusive of two symmetrically arranged convex cam tracks coupled with the reciprocable e1ement and an actuating block mounted to turn independently upon the same m0unting for the other block and alternately movable along the convex faces of these tracks which are disposed between and form with the aforesaid-concave track slots in which both blocks move together, the track engaging faces of said blocks conforming in curvature to the track faces they engage, there being means for transferring the blocks from each slot to the other.

28. The combination with a reciprocable element; of mechanism taking part in effecting reciprocable movements of said element; mechanism for beginning the reciprocating strokes of said element that is inclusive of two concave cam tracks coupled with the reciprocable element and whose concave faces are opposed and an actuating block mounted to turn and alternately movable along the concave facis of said tracks; and mechanism for finishing reciprocating strokes of said element that is inclusive of two synnnetricall arranged convex cam tracks coupled with the reciprocable element and an actuating block mounted to turn independently upon the samernounting for the other block and alternately movable along the convex faces of these tracks which are disposcdbetween and form with the aforesaid concave track slots in which both blocks move together, the track engaging faces of said blocks being extended in the plane of movement of said blocks, there be ing means for transferring the blocks from each slot to the other.

29. The combination with a reciprocable element; of mechanism taking part in efecting reciprocable movements of said element; mechanism for beginning the reciprocating strokes of said element that is inclusive of two concave cam tracks coupled with the reciprocable element and whose concave faces are opposed and an actuating block mounted to turn and alternately movable along the concave faces of said tracks; and mechanism for finishing reciprocating strokes of said element that is inclusive of two symmetrically arranged convex cam tracks coupled with the reciprocable element and an actuating block mounted to turn independently upon the same mounting for the other block and alternately movable along the eonvex faces of these tracks which are disposed between and form with the aforesaid concave t 'ack slots in which both blocks move together the track engag ing faces of said blocks conforming in curvature to the track faces they engage, he ends of said tracks being disposed to position the respective block for proper engagement with the tracks to be engaged as the blocks pass from engagement with respective cam tracks into engagement with the other respective cam tracks.

30. The combination with a reciprocable element; of mechanism taking part in cf feeting reciprocable movements of said element; mechanism for beginning the rec1pro eating strokes-of said element that is 1110111- sive of two concave cam tracks coupled with the reciprocable element and whose concave faces are opposed and an actuating block mounted to turn and alternately movable along the concave faces of said tracks; and mechanism for finishing reciprocating strokes of said element that is inclusive of two symn'letrically arranged convex cam t'acks coupled with the reciprocable element and an actuating block mounted to turn in dependently upon the same mounting for the other block and alternately movable along'the convex faces of these tracks which are disposed between and form with the aforesaid concave track slots in which both blocks move together, the track engaging faces of said blocks being extended in the plane of movement of said blocks, the ends of said tracks being disposed to position the respective block for proper engageme nt with the tracks to be engaged as the blockspass from engagement with respective cam tracks into engagement with the other respective cam tracks.

31. The combination with a reciprocable element of mechanism taking part in effooting reciprocable moven'ients of said element; mechanism for beginning the reciprocating strokes of said element that is inclusive of two concave cam tracks coupled with the reciprocable element and whose concave faces are opposed and an actuating block mounted to turn and al ternately movable along the concave faces of said tracks; and mechanism for finishing reciprocating strokes of said element that is inclusive of two symmetrically arranged convex cam tracks coupled with the recipro cable element and an actuating block mounted to turn independently upon the same mounting for the other block and alternately movable along the convex faces of these tracks which are disposed between and form with theaforesaid concave track slots in which both blocks move together, the track engaging faces of said blocl s conforming in curvature to the track faces they en.

gage, there being means coupled with the reciprocable element for transferring the blocks from each slot to the other.

32. The combination with a reciprocable element; of mechanism taking part in effecting reciprocable movements of said element; mechanism for beginning the reciprocating strokes of said element that is inclusive of two concave cam tracks coupled with the reciprecable element and whose concave :taces are opposed and an actuating block mounted to turn and alternately movable along the concave faces of said tracks; and mechanism for finishing reciprocating strokes of said element that is inclusive of two symn'ietrically arranged convex cam tracks coupled with the reciprocable element and an actuating block mounted to turn independently upon the same mounting for the other block and alternately movable along the convex faces of these tracks which are disposed between and form with the aforesaid concave track slots in which both blocks move together, the track engaging faces of said blocks being extended in the plane of lllOVGll'lGIlt of said blocks, there being means for transferring the blocks from each slot to the other.

In witness whereof, I hereunto subscribe my name this eleventh day of November,

ROBERT MI'EHLE.

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