US1788098A - Mechanical movement - Google Patents

Description

Jan. 6, 1931;

F. B. FULLER MECHANICAL MOVEMENT Filed Feb. 26, 1950 A TTORNEYS.

Patented Jan. 6, 1931 i V riannnmc ia, FiILLER, or SPRINGFIELD, 'MAssAcHUs TTs, ssIcNoR TO ACKAGEMA GHINERYV COMPANY, or VSPEINGFIELJD, MASSACHUSETTS, a CORPQRATION or mssAcnUsE'rrs MECHANICAL MOVEMENT I Ap plication filed February as, 1930; Serial- N0. 431,493;

This invention relates to a mechanical movement. One object is to provide a meche anism for convertlng a constant rotarymovement into a reciprocating movement having 5' a; comparatively long period of dwell.- A

ing parts,

further Object isto provide a mechanism ofthis general characterin which a slow'move-r ment in one directionwillbe coupled with a faster movement in the reverse direction, thetwo movements being separated by a dwell where no reciprocation willtake place in either direction. A further object is to accomplish theseresults without'the use of cams and with aminimum numberofmov- Referring to the drawings: I l Fig. 1 is a side elevation of my improved device;

Figi 2 is a similar View withthe parts'in a different position of operation; and

Fig. '3 is a time motion chart of the driven 5 driven member 22; o

element.

Theprinciple upon whichthe device oper-" ates isthe coupling of the driving shaft to the driven element through two mechanical stages; the first a linkage or equivalent de vice for giving to a movable pivot point a motion in a closed curve, a portion of which 15 substantially an arc of a circle, and the second a link having a length equal to the: radius of that are and joining the pivot point with the driven element. In the adaptation shown in the drawings the driving power is supplied from a shaft 10, preferably con stantlyrotating. A crank 11 is fixed upon this shaft, its crank pivot-12 traveling a-ta uniform" rate around a circular path 13. Spacedfrom the shaft 10 is a fixed pivot 14 upon which is a swinging bearing block 16. Pivoted to the crank at 12,'and provided with a slot 17 by which it may slide upon the block 16, is a lever 18 carrying at its end a pivot 1.

- the path 20 at'intervals.

' As the shaft 10 rotates, the pivot 19 will be caused-to move through the path indicated by dot and-dash lines 20 inFigs. 1 and 2, with a fastermovement on the right hand side of this path than elsewhere. 7 This is indicated by the short lines which intersect These lines are .by a 1ink'21,

spaced apartfat' distancescorresponding to twelve degreesrotation of the crank 11, and of course a wide spacing of the lines represents a more rapid travel of the pivot 19 than a close spacing. The pivot '19 is joined which the link is pivoted at 23, the driven memberbeing here shownas guided for reciprocation-in suitable ways 24:." Due to the proportions of the crankiand. lever being] with a driven ,member 22, to

about as shown, the lower part 25 of the between thecenters of pivots Hand 23, is equal to the radius of this arc.

During-the entire passage ofthe pivot 19 through the arc-shaped portion 25 of'itspath, the'link 21will swing freely'about its pivot-23 and will transmit no motion to the reciprocating I The utility of the device can be described most clearly with relation to its adaptation to onespecific use. I In the use chosen for illustration, the device is employed to operate the elevatoryof a wrapping machine. In certain machines forfwrapping articles in paper, the articles are fed into position upon a flat-topped elevator-which is then'caused to rise, forcing the articleagainst a piece of paper-previouslyplaced above it and intr0- (indicated by 26 in Fig.

ducing both article and paper into-a folding I mechanisnn W'hen the xelevator-is -in' its or art1cle-rece1v1ngposition-1t is desirable, that t rest for comparatively long period so as to givei ample time for the article to be, fed in and tobecome accurately positioned upon it. Various wrapping operationsmay be :performed on: the article and paper dur i119? the ascent of the elevator and this period of its motion-is preferably steadvaud 'not too rapid. The descent'of the elevator fromits raised position is-merelv idle travel, "and preferably accomplished rapidly so as to;

leave thermajor partof the-cycle for the operations of loading and transferring the article."'-*' '7 {The device described accomplishes these 1 desirable -resultswithout the use of cams or sent relative displacements of the elevator above-its lOWGI'IIlOSt:POSltlOILSllOWD in F g le The pat-h starts at the left of Fig, '3 with of intermittently contacting parts, In Fig. 3 the displacement of the article-receiving top. 27 of the elevator 22 has been plotted against the angular travel of the driving shaft 10. The vertical lines, represent twelve degreepieriods'in the steady angular. motion of the shaft, and vertical distances" repre the elevatorat its highest position. As the elevator descends from the positionlof Fig. 2, it moves rapidly, represented in Fig. 3

by the steep slope 30 ofithe path. The relav tively rapid motion keeps up until the ele-' vator hasvery nearly reached the bottom of 'its-stroke, when'it comes-to rest-- smooth-- This lowermost ly at" about the point 31, position is preferably-level I with or slightly below a shelf28 a'lon'gwhichi articles are fed onto theelevatori dwell 32 resulting at this pointdi1e to: the passaged pivot smoothly and 19in an arc concentric with th e piv0t2-3, con

tinues for a very" considerable periody-equal with the proportion'of parts showntotabout sixty'degreesof rotation' ofcrank 11. Be-

ginning again torise, 7. the elevator starts with alesser' speed continues than during-its descent. This is indicated by.

the slope ofthe rising portion 38 0f thecurve being less than theslopeoff the descending portion 30.

The device is of course equally adaptable to' other'use'sandcan be operated in differ entways;

dwell was at the' bottom of thestrokez- Byj leaving the "arrangement of parts as shown and merely rotating cranli 11 inthe 'reverse direction, the elevator wii'l be given a rapid rise and a slow descent, witha-dwell at'the 11' M'echanism* bottom. Other" adaptations will" suggest themselves to those skilled the art Without further" description; I

' What I claim is:

t'ion "intogreciprocat-ingmotion comprising a crank, *a bearin'g; aglevel pivoted tothe crank p I slidably mountedon the bearing, arecipro'cab'l'e driven in'embergand' a linlrj oining' the driven 'member'wi t'h the lever, constructed and arranged 'so that thep'oint 'of' con V nectionbetween the link andthej-lever'moves' i in a clo'sed path havingonefi portion in sub' stantiall y' 'th'e' shape-of a: circular arc die 1 radius equal to effective on Ztlie 7 link;

tion into r'eciproc'ating moti'on comprising a rotatable'driving member, a reciprocable v driven member,- a link" pivoted to the reciprocable' member, and mechanism coupling For example;i the whole nie'chanism could be" inverted in cases where the desired at the top rather than a closed path elongated in the direction of travel of the reciprocable member and having a portion lying in an arc of a circle having the link as its radius.

3. Mechanism for translating rotary motion into reciprocating motion" comprising a rotatable driving member,- a reciprocable driven-member, a link pivoted to the reciprocable member, and mechanism coupling the,

driving nember. with'ithe' free endoflthe link,

organized to cause sa'idm'end i'toj.traveL in a closed path elongated in the direction of travel of the reciprocable member, the speed of: travel ofithe-linki on one side of said elongated path being substantially greater substantially as and: forr'the purpose dos scribed;

' 5. Mechanism for tramslatingsrotary mo.--

tion into reciprocating motion, comprising! a:

rotatable driving member, a reciprocable driven member, :alink pivotedto the ramprocable member, and: mechanismicoupling the driving member with the. free end-oflthe' l1nk,,.organized to cause.- said; end.- to: travel in a closed path elongated. inthe directionof' travel of the reciprocable member and having one end of said path formed {LS-1H1; are of a circle having-the link. as its: radius.

1 'Intestimony' whereof I. have afiixed my signature. 1 p

' -FR-EDERIG B. FULLER.

and a lever pivoted; to: the; crank! Mechanism fortranslating t t 5, m0; f

thedrivin'g member with the-freeend of'the V link,.organized to cause-said end-to travel in CERTIFICATE OF CORRECTION.

Patent No. 1,788,098. Granted January 6, 1931, to

FREDERIC B. FULLER.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 1, line 84, after the word "its" insert the word lower; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 27th day of January, A. D. 1931.

M. J. Moore, (Seal) Acting Commissioner of Patents.

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