US317663A - Mechanical movement - Google Patents

Description

(No Model.) 4 Sheets--Sheet l.

R. MIEHLE.

MBGHANIGAL MOVEMENT.

No. 317,663. Patented May 1,2, 1885.

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WITNESSES $47.

INVENTOR (No Model.) 4 Sheets-Sheen 2.

R. MIEHLE.

MECHANICAL MOVEMENT.

No. 317,663. Patented May l2, 1885..

INVENTOE (No Model.) 4 Sheets-Sheet 3.

. R. MIEHLE.

MECHANICAL MOVEMENT.

No. 317,663. Patented May 12, 1885.

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MECHANICAL MOVEMENT. No. 317,663. Patented May 12, 1885..

WITNESSES NVBNTOR ,4% wi/MME f2 @www UNITED STATES4 PATENT OFFICE.

ROBERT MIEHLE, OF CHICAGO, ILLINOIS.

MECHANICAL MOVEMENT.

SPECIFICATION forming part of Letters Patent No.317,663, dated May 12, 1885.

Application filed March 16, 1885.

To aZZ whom it may concern.-

Be it known that I, ROBERT MIEHLE, a citizen of the United States, and a resident of the city of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvementsin Mechanical Movements, of which the following is a specification, to wit:

This invention relates to improvements in that class of devices consisting of apinion operating with a rack or racks to eect a reciprocating movement for printing-presses,pumps, iron-planers, large church-organ bellows, and other machinery wherein aregular reci procating movement is desired between the centers, with a slow stopping and starting movement at the centers or turning-points of each reciprocating stroke. y

The invention consists of a mechanism. by which a very slow stopping and starting movement is obtained at each end of the reciprocating movement without losing the amount of stro'ke heretofore lost by diminishingthe revolutions of the pinion, as will hereinafter be explained. l

The invention also consists of a novel mechanism and arrangement of parts whereby the racks are shifted laterally of the pinion-that is to say, parallel with the aXis thereof-to require less space in its operation; also, to obviate the necessity of a counter-balance when the pinion-'shaft is placed in a horizontal position; and, furthermore, to obtain fromapair of racks and a pinion which has but one revolution a regular and complete reciprocating movement between its centers greater than the radius of the pinion or sweep of the wrist-pin across the centers, with a very slow stopping and starting movement at the end of each reciprocating stroke, the saine as obtained from a crank-arm and wrist-pin.`

It also consists of other combinations of parts, hereinafter described and claimed.

, The device consists of two racks, a pinion, and wrist-pins for engaging automatically be-r tween end slots, to complete one reciprocating movement and advance on the succeeding one, and to alternately mesh the said racks with the pinion, as will hereinafter be described.

In the accompanying drawings, Figure 1 is a vertical side view of my invention, showing (No model.)

the pinion, racks, and end shoes which form the end slots in their respect-ive positions with the rack-frame. Fig. 2 is a vertical end view of the same with the outer end shoe and a portion of the frame removed to which it is secured. Fig. 3 is avertical side view, showing the wrist-pin as it is engaged between the end shoes at the time of leaving the racks. Fig. 4 is a view similar to Fig. 3, showing the wristpin at the point it begins to reduce the regular movement to turn its centers,witlh the pinion entirely disengaged from the racks. Fig. 5 is a vertical end view of a modified arrangement of my invention. Fig. 6 is a vertical side view of the same. Figs. 7, 8, and 9 are views showing the arrangement of the wristpins on the pinion. Figs. 10, 11, and 12 are Iviews showing the arrangements for taking up all wear on the wrist-pins and the friction -rollers thereon. Fig. 13 is a diagram showing the driving distances usually obtained from pinions. Fig. 14 represents one of the bent pins which connect with the rockarms for shifting the racks. Fig. 15 is a vertical side view of another modified arrangement of my invention. Fig. 16 is a vertical end View of the same with the outer end shoe and part of the frame removed to which it is secured. Fig. 17 is a portion of Figs.'15 and 16 in a sectional plan view. Fig. 18 is a vertical side view showing one of the end slots so formed to have a quick stopping and a slow starting movement at the centers. In reference to the drawings of the present invention, A represents the rack-frame, which is secured to the machine or device in almost any way it may be convenient or desirable, as the present improvement permits of the pinion-shaft being put in a vertical as well as horizontal position.

The rack-frame A is provided with racks C C', with which the pinion D alternately meshes while operating in a continuous rotary motion. The racks C C are positioned so as to permit of a lateral shifting movement of the pinion-that is to say, parallel with the axis of the pinion-shaft. The proper meshing of the said pinion and racks is obtained by the wrist-pins E upon the pinion D, which automatically enters the slots E', (which are formed by the shoes A"A at each end of the rackframe A.) The wrist-pinEin passing through IOO the slots E effects the gradual stopping of the one reciprocating movement and the gradual starting of the other, and also effects the lateral shifting of the racks C C', as will hereinafter be described.

In the constructions shown in Figs. 1 to 6 the parts are so proportioned that Vthe pinion D makes two complete revolutions for recipro f cated in Figs. 1, 2, 3, 4, and 14,- which slide loosely in the rack-frame A, and are secured to the racks C C', as indicated in Fig.. 2.

Upon the rock-arms F are camsff, as indicated in Figs. 1, 2, 5, and 6, which, as the wrist-pins E pass through the slots E', engage the outwardly-extending cam f, as indicated in Figs. 2 and 5, thereby imparting to the rock-arms F through rock-shaft Y a swinging motion, by which the racks O C and pins c are shifted .parallel with the axis of the pinion-shaft to properly mesh with the pinion D. i y

o designates pins, which are secured into the rack-frame A. These pins are similar to pins c. Their functions are to support the racks C C', wherein they fit loosely to allowr the shifting thereof, heretofore described.

In Figs. 1, 2, 5, 6, 15, 16, and 17, D designates a face plate or rim secured upon the side of the pinion D, to prevent the racks C C altering their positions while in operation with the pinion D.

In Fig. 5, g designates a spring secured to the rack-frame A, its function being to cushion the rock-arms F, and also to assist in starting the motion thereof as the wrist-pins E engage with the cams f f, as indicated in Figs. 2 and 5.

I do not limit myself to the use of the wristpin for shifting the racks, as other means may be employed, and the same may be held in their proper position by other means than the face-plate D.

Figs. 4 and 6 represent a slightly-modifiedv form of the heretofore-described invention, in which theracks C C are secured directly upon the rock-arms F. In this arrangement the racks C G are free to swing with the rockarms F, and that portion of theframe in which pins o c are placed may be dispensed with and the shoes A A placed upon hangers A, as indicated in Figs. 5 and 6. In this arrangement the face-plate D may be dispensed with, as the pinion, when engaged with the racks, will prevent the same altering their positions.

Figs.15, 16, and 17 represent another modified arrangement of my invention, in which the racks C C and the end shoes, A A, are secured directly upon the rock-arms F, and the rock-shaft Y is journaled into hangers A. In this arrangement the rock-arms F are shifted in just the opposite direction heretofore described by a fiange formed upon the friction-roller g of the wristpin E, which engages into the grooves g4 between the rockarms F and the shoes A A, as indicated in Figs. 16 and 17 and in the dotted lines in Fig. l5. Fig. 15 also represents the parts proportioned and arranged so that the pinion will have but one revolution for completing a reciprocating movement. v

By arranging the parts so that the pinion has an odd number of revolutions-as one, three, and five-only one wrist-pin is required; but when the pinion has an even number of revolutions-as two, four, and six-two Wristpins are necessary.

To take up the wear upon the friction-roller g of the wrist-pins E, the shoes A A are bolted upon flanges c of the rack-frame A, to allow an adjustment of the same by inserting any suitable packing between the shoes A A and flanges c, as indicated in Figs. 1, 3, 4,. 6, 15, and 18, and to take up the Wear upon the wrist-pin E and the inside of the friction-rollers g, which is necessary whena very smooth motion is desired, without any jar at the centers or turning-points. The shoes A A are recessed one-half their bearing-surfaces, and the shoes Ahave adjustable liners a fitted into the recesses, with set-bolts a for adjusting the said liners, and bolts a for holding them in place, as indicated in Figs. 10 and 11,and the frictionrollers g', made in two parts, as indicated in Fig. 12. It is evident that when the liner a is adjusted it presses the two halves of the friction-rollers g around the wrist-pins Ein such -a way as to make a close joint as it passes the centers, and when the whole width ofthe shoes is not necessary for the friction-roller g to bear upon at the points at which they are `curved the whole length of the shoes A A can be recesses. In this arrangement the one shoe is recessed on the inner side, nearest to the rack-frame A, and the other shoe on the outer side, so that the recessed parts of the shoes A A do not face each other, as indicated in Fig. 12. The shoes arranged in this way are adjusted the same as described for taking up the wear on the friction -roller. The liner a and bolts a c are then dispensed with. a, The taper pin f, (indicated in Figs. 8 and 9,) inserted into the wrist-pin E and passing through the screw-head f, is to prevent the screwf working out while the device is in motion.

The dotted lines I,which exten-d above and below the rack-frame A, as indicated in Figs.

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1 and 6, indicate the points wherein the wristpins E completethe one and advance on thev other epicycloidal curves, which they take up on the rack-frame A as the pinion D is meshling with the racks C C', and also indicate the distance traveled by the pinion D upon the racks G C in exactly one-half revolution. It will evidently be seen that the wrist-pins E do not enter between the shoes A A until they have passed the dotted lines I, and also that the larger lthe diameter of the frictionrollers g upon the wrist-pins E the greater the space they will occupy in making the epicycloidal curves, and that by using a large friction-roller the time of entering the wrist-pins E between the shoes A A is delayed. The

dotted lines I in Fig. 1 indicate the epicycloidal curves heretofore mentioned.

As it is very desirable to retain large friction-rollers upon the wrist-pins E, the delay just described is obviated by the axis of the wrist-pins being set somewhat below the pitchline of the gears upon the pinion D, as indicatedin Figs. 7, 8, and .9. The wrist-pins E, when placed in such position, will pass the dotted lines I with a quicker movement, whereby the friction-rollers g upon the wristpins E are entered between the shoes A"A at the same time as when the axis of the wristpins E are placed upon the pitch-line of the gear with small friction-rollers.

The wrist-pins E are formed with rightangled offsets or fianges g, which are fitted into recesses upon the side of the pinion D, as shown in Figs. 7, 8, and 9. The lower flanges, which extend toward the axis of the pinion D, are bolted onto the web thereof, and on the upper flanges teeth are formed to correspond with those upon pinion D in place of those cut away in forming the recesses. The rear ends of the wrist-pins E are formed with eccentrics g, to allow sufficient metal to form and hold the teeth which are above the bore in the pinion D, through which the eccentrics g are passed and bolted, as shown in Fig. 9.

The diagram Fig. 13 is to show the length of stroke obtained from pinions having two, three, and four revolutions, the large pinion being proportioned the same as pinion D in the drawings, and the smaller one just onehalf thereof. It is evident that when the revolutions of the pinions are diminished the length of the stroke is also diminished, the greater amount of stroke being lost when the revolutions of the pinion are diminished from three to two revolutions for completing a reciprocating movement, and the length of stroke heretofore obtained from pinions, as shown in Fig. 13, is indicated by the dotted lines I at the pitch-lines of the gears, and the dotted lines I at the end of that portion representing the racks. The manner in which the present improvement obtains a stroke greater than heretofore by a pinion with two revolutions is by the additional length of the racks C C', which extend outwardlyfrom the dotted lines I', as indicated in Figs. l and 6, to enter the wrist-.pins E between the end shoes, A A, the ends of which are formed upon the epicycloidal curve I, heretofore described, sui-1iciently to receive the wrist-pins E properly while the pinion is disengaging with either of the said racks, after which the shoes are shaped to impart a reduced movement to the rack-frame A by the wrist-pins E in time to retain the slow stopping and starting motion at the centers or turning-points.

The shoes A A in the present drawings are formed in such manner as to produce a stroke-which is indicated by the dotted lines I at the end of the dotted lines I in Fig. 6*- with a pinion which has two revolutions to equal that obtained from the devices heretofore constructed, in which the driving circumference of the pinion is just one-half thereof, having four revolutions. It is evident the-length of stroke can be extended by forming the shoes A A in the manner shown in Fig. 18, the upper half of which is formed upon the epicycloidal curves I very near to the center or turning-point, the lower half of the shoes A A being formed the same as in the main drawings. By this arrangement a quick stopping or a slow starting movement'at the centers or turning-points is imparted to the rackframe A, and in turning the pinion in an opposite direction just the reverse movement is gage with the said racks, substantially as described.

3. In a mechanical movement,the combination, with a rack-frame, racks, and pinion, of the racks having a lateral shifting movement `imparted to the same in the direction of the axis of the pinion, to alternately engage the said racks with the said pinion, substantially as described.

4:. In a mechanical movement,the combination of a rack-frame and racks, a pinion provided with a-wristpin,and end shoes with the racks having a lateral shifting movement of thepinion, substantially as described, and for the purpose set forth.

5. In a mechanical movement, the combination of a rack-frame and racks, a pinion provided with a wrist-pin,and end shoes with the racks having a lateral shifting movement imparted by the wrist-pin, substantially as described, and for the purpose set forth.

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6. In a mechanical movement,the combination of a rack-frame and racks which shift laterally,a pinion, D, end slots, E', rock-arms F, and Wrist-pin E, substantially as and for the purpose set forth.

7. In amechanical movement, the combination of a rack-frame and racks which shift laterally, a pinion, D, end slots, E, and wristpin E, rock-shaftY,rockarn1s F, and eamsf, substantially as and for the purpose set forth.

8. In a mechanical movement,the combination of a raclrframe and racks which shift laterally, a pinion, D, end slots, E', wrist-pin E, rock-shaft Y, rock-arms F, cams f, pins c c, and face-plate D', all combined substantially as described.

9. In a mechanical 1novement',the combination of a pinion and wrist-pin, the wrist-pin having a right-angled offset with teeth formed thereon, substantially as described.

l0. In a mechanical movement,the combination of a pinion and wrist-pin, the wrist-pin having right-angled offsets with teeth formed upon one of the said offsets and the other for clamping to said pinion, substantially as described.

11. In a mechanical movement,substantially as described, the combination, with a pinion and wrist-pin, of the shoes A A, being adjustable, substantially as and for the purpose set forth.

l2. In ameehanical movement,substantially as described, the combination of a pinion and `wristpin, made in two parts, with the shoes A A", being adjustable,the faces of which are recessed or cut away, substantially as and for the purpose set forth.

13. In a mechanical movement, substantially as described, the combination, with a pinion and wrist-pin, the wrist-pin made in two parts, of the shoes A A, being recessed, the shoes A having adjustable liners with set-screws and bolts, substantially as and for the purpose set forth.

In testimony that I claim the foregoing as my own I affix my signature in presence of two witnesses.

ROBERT MIEHLE.

Witnesses:

GEO. W. FRITZ, HENRY SCHAFER.

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