US1786933A - Shake mechanism - Google Patents

Description

F. A. BOWMAN SHAKE MECHANISM Dec. 30,' 1930.

Patented Dec. 30, 19250` D STATES Parr ori-ice FREDERICK A. BOW'MAN, OF WILMINGTON, DELAWARE, ASSIGNOR TO THE PUSEY & .Y

roNiis conrona'rroN, or WILMINGTON, DELAWARE, A oonroBaTioN on DELAWARE SHAKE MECHANISM Application iled August 24, 1928. Serial N'o. 301,865.

This invention relates to shake mechanisms and particularly to mechanisms of that class having means whereby the amplitude of the vibrations produced by themechanism may 5 be varied while the machine is in operation. The invention is designed specially for use in connectionrwith paper-making machines of the Fourdrinier type, and for imparting to the travelling wire upon which the web loof paper-is formed a very rapid vlateral vibratory motion, or shake; but the mechanism hereinafter described, and in which the present invention is embodied, is adapted for use in connection with machines of various vsorts in which it is desired to impart to some element thereof a rapid Vibratory motion of variable c amplitude. y

It has long been deemed desirable in the paper making industry to have a shake head 2G Vso constructed that the amount Vof throw communicated to the Fourdrinier part of a paper machine could be adjusted to a nicety whilethe machine is inl operation at full speed; for by that means the machine tender is enabled to observe the eects upon the pulp, while spreading itself upon the wire, of slight changes of adjustment, and thus to determine` and obtain the precise amount of throw tliatis-best suited foreach batch of pulp. It has also been deemed desirable to providemeans for varying the rapidity of the vibrations, that is the number of shakes per minute, as well as the amplitude thereof. This latter object is easily accomplished, as by the use of speed-varying cone gears; or by employing a variable speedy electric motor for driving the main shaft ofthe shake'mechanism.

t is likewise a comparatively Veasy matter ff; to provide driving connections whereby the throw of the vibrations can be varied while the machinery is in operation;` and in fact driving connections capable-of accomplish ing that result have heretofore been constructed and put into use.

But` it has been found a matter of great diiiiculty to devise a mechanism of the above character that is capable of withstanding, for any considerable length of time and without serious deterioration, the great strain and wear to which it is subjected by reason of the incessant shocks due to the rapidity of the vibrations and to the weight and consequent momentum of the parts that are vibrated.

It is well understood that reciprocatory movements, such as the oscillations of a rockshaft, are the most vdifficult sort of movements the mechanic has to take care of; and it is also understood that the difficulties are magnified, and in much more than simple ratio, as the rapidity of vibration and the momentum of the parts to be vibrated are increased. Hence, in an apparatus designed for the accomplishment of the objects stated above-the Vibrations being iapid and theA momentum of the parts being great-the shocks are proportionately intense; and since all those shocks must passthrough the adjusting devices', it ha-s been found difficult to construct the same in such manner that they will not speedily break down, or their ehciency and precision be quickly impaired, by reason of the strain of the strong and incessant vibrations they must undergo;

Therefore the present invention has for Vone of its major objects to provide'powertransmitting mechanism of the kind referred to, capable of ready adjustmentV whilethe machinery is ruiming, and at the saine time capable of withstanding, for a muchk longer period than any heretofore in use and without impairment asto its efficiency, the shock and wear of the vibrations.

In the accompanying drawings, 'in which the preferred embodiment of the invention is illustrated,

Fig. l shows the mechanism in elevation;

Fig. 2 is a top plan View of the part of the mechanism shown' at the right hand side `of Fig. l;

Fig. 8 is a vertical section on line 3-3 of Fig. 2;

4 is a vertical section on line 1r-4 of Fig. 2; f y

Fig. Y5 is a horizontal section on line 5-5 of Fig. 1; 'f

Fig. 6 is a plan View of the rocker;

Fig. 7 is a vertical section on line 7 7 Vof Fig. l;

Fig. 8 is a side elevation ofthe beam;

Fig. 9 is a vertical section on line 9--9 of F ig. l; and

Figs. 10, 11 and 12 are det-ail views.

The main drivin g shaft 14 of the shalre head is supported in bearings 15, 15a, 15b, carried by standards 16, 16o, 16h respectively, all supported by base 17 (Figs. 2 and 3). Said main shaft 14 is driven by a variable speed electric motor 20 through pinion 21 and gear 22, the latter-being liXed on said shaft 14.

The purp sa: ci the mechanism as a whole, commonly called a sh alre head, is to vibrate the shake frame of a paper machine (part ot said frame beingr shoivn at 25, Fig. 1) from power shaft 14 through conrl ctions which convert the rot-atory motion of' 'd shaft into very rapid .ibrationsr and which admit o?? the adjustment oi? amplitude or throw or' said vibrations While the machine is infull operation. Therefore the t'olfloivi'ugr detailed description will be occupied lmainly Withl the construction of the parte whereby the above stated purpose is accomplished.

Power sha-ft 14 is provided with a pair of eccentrics 26, 26', which .act as one, each hav-- ing its eccentric rod 27; it being;` preferable to employ a pair of eccentricsfor trfrnsmitting the power from shaft 14, though single eccentric would :obviously serve thepurposc. The eccentric rods are pivoted 'attheir loiver ends to one end of rocker 28hy meansoiy shaft 29, said rocker being journaled atfitswot'l-ier end by means of trunnions 8O in a standard 31 supported by ibase 17. Thus the eccentric rods 27 will impartito rocker 28 a rocking motion which is equal, Vat the zfree end thereof (where the rods are att-ached) tothe thronv oit f the eccentrics l26.

Rocer 28 transmitsi the motion received from eccentric rods 27 to another `rocking;- or-oscillating member, preferably inthe form of a massive bell-crank lever., which has a horizontal arm 38 anda 'vertical arm 34, and is journaled in the frame at 35.

Rocker28 is bifurcated, s tiro parallel members being inthe same horizontal plane (Fig. 6). The horizontal arm 33 ol the bellcranlr lever is also biturcated at its -tree end (Fig. 8) its 'tivo parallel members, 3G. 37, being` in the same vertical plane; which plane intersects at right angles the plane ot rocker 28 occupying a position midivav bet. Teen the tivo parallel members thereof (Fig. 3). Thus the tivo members rocker 28 lie one on one side and the other on the other of the vertical plane of arm of the bell crank lever; While the tivo members of the latte are Vone above and the other beneath *he horizontal plane of the rocker.

The .connections between rocker 28 and bell-crank lever 33, are such that, While permitting` vready and very precise adjustment of the amount oi three.v transmitted by the former to the latter While the machine is in operation, the range of adjustment be- .the drawings, arm 33 of the bell-crank ther the pivot-carrying blo( ing from zero to the determined maximum, Whatever it may be, they are capable oi With standing for a comparatively long;- time the deteriorating eiiects of the rapid and heavy vibrations that pass through them.

The connection between these two nicmbers is effected by means ot a pivot or trunnion whose support is adiusably carried by one ol? said members and which is ournalled in bearings that are adjustahiy carried by the other. This featurey oftne invention is capable of various embodiments. in the preit'erred construction, which is illustrated in is 'forked at its tree end to 'form two parallel guide-nays 36, 37 (Figs. 1, 7 and 8) one directly above the other, in which .is slidingly mounted the pivot-carrying block 39 (see cnlarged section. Fig. 7). The guide-ways 86, 8T( e attached together at their extremities by a strap 40, which helps to impart rigidity to the structure.

The pivot carried by block 39 is in theform of a pair of trunnions 41, each of which is yournaled in a. bearmgblock 42, one on ea-ch si deoi sliding block 39. Each lof these bearing blocks 42 is slidinglyl mounted in a guide-Wayet in the bifurcatedcrocker l28 (Figs. 5, 6, 7) .i Thus the pivoted vconnection between rocker 28 and ybell- crank 33, 34 is movable'towardsandaway from the axis of oscillation of the former. e For thevfpurpose Aof effecting this adjustment readily while'the machinery is in operation, a screw- 44 is tapped into a :threaded perforation which passes through block 39 '12). This adjusting! scre'wis.operatedby 'hand Wheel'45 through WormA 46 and ivorrn gear 47 (Figs; 2 and 9). Wheel 4'5 is provided with a smaller hand wheel 48 for locki'ng'it (andthe connected adusting mechanism) in position when not being'operated for adjustment 'of the trunnion-carrying block 39.

By reference to F ig. 1, `in connection with and '6. it .vill be seen that` block 39 can be adjusted in one direction until the axis of trunnions 41 carried thereby is in align* nient with the axis oi" oscillation 30 of rocker 28; thisbeing the position., in which no motion Will be imparted by rocker 2S to bellcrank 33, 34. Ohr the other hand, the tar- 39 is ino in the opposite direction, that is 'oivardtI the free endet rocker 28'. the gri'-ater Will be the amplitude of the vibrations connnuaicated from said rocker to said helf crail. and hence to the shake 'frame ot tno paper machine. A scale 5() 1 and 8) on guide-nay 36 oi the bell-crank shows the zero position at the e1;- treme lett there .and thc graduations oi the scale indi-cate'increasingr d rees ot amplitude of the vibrations troni let o rie t .1 point- 51 ou block L39 co-acts With VNd scale to indicate the amplitude of the vibrations that are beingr imparted to the shake-:trame ,tric rods 27 which ably mounted in ways onthe other Motion is'communicated from arm 34v of the bell-crank to the shake-frame 2` by means of a horizontally reciprocatory rod (Fig. l) which is detacliably connected at 54 with a r d 55 attached to the shakeframe. Said frame, its supporting springs 56, and the table rolls part of one of these being indicated at 57) are, or may be, of usual construction, and hence need not be further described.

It will be observed that, in the shakemechanism described above and illustrated in the accompanying drawings, the power transmitting elements are throughout of solid and rigid construction, and that the connecting elements, while admitting of ready adjustment, and to a nicety, while the machine is running, are so constructed and arranged relatively tothe connected parts, as to develop a minimum amount of wear and to sustain a minimum amount of injury by reason of thejars and shocks caused by the rapid and heavy vibrations. Thisis duepartly lto the strength and balanced relations of the eccentransmit motionto rocker 28, and partly to the strength andr form of the slidable pivot-carrying blccli 39 and ythe slidable bearing blocks 42, which parts have extended bearing surfaces in contact with Athe surfaces of tneir'respective guide-ways.

Furthermore, the describedconstruction is such as to make it comparatively an'easy inatter to take up wear at the places where the maximum wear occurs` that is to say, between the contact surfaces of block 39 and its slidewavs Vand the Contact surfaces of the beaiing blocks 42 and their slideways. For taking up the wear between block 39 andits slide ways an adjustable slioeGO is provided (F ig. l1), in the form of a long and relatively thin plat-e of gradually increasing thickness, adapted to be inserted between block 39 and its lower 'guide-ways 37 (F ig. `7 It is provided with threaded sleeves 62 through which pass adjusting bolts (iwlieieby it may-be fastened in place in threaded sockets in the frame (Figs. l and 3) and may be adjusted from time to time to Vtakek upfthe wear.l

Similar shoes 65, one of which is shown in detail in F ig. l0, are provided forthe bearing blocks 4t2 (Figs. 1'and'7). Y

ldlhat is claimed is l. A shake mechanism comprising a power shaft, a rocking member pivoted to the frame and receiving a reciprocating'motion from said shaft, a vibratory lever. rand connecting devices between said rocking member and said lever comprisinga pivot and a carrier therefor slidably mounted in ways on one of said members, bearings for said ,pivot slidmember, and hand operated adjusting means for said movable parts, operable while the machine is runningV Y l Y Y 2. In a shake mechanism, the combination with'a driving shaft, yof powertransmitting ladjustable to vary the devices comprisingk two vibratory ymembers eac. pivoted to theframe of the machine .and one of them connected with said shaft so as to be reciprocated thereby, and an adjustable connection between said members, operable while the machine is running, to vary the amplitude of the vibrations transmitted from one to the other.

3. In a shake mechanism the combination with a driving shaft, of power transmitting devices comprising two vibratory members, eccentrics and eccentric rods connecting one of vthem with said shaft, and an adjustable connection between said members compris ing an adjustable pivot-carrier slidably mounted on one of said members and means operable while the machine is in operation for moving said pivot-carrier towards and away from a position of alinement with the axis of the other vibratory member.

e. In a shake mechanism the combination with the main shaft thereof and with means for driving said shaft at variable speeds, of power transmitting mechanism for converting the rotatory movement of said shaft into vibratory movements of varying amplitude, comprising two pivoted members one-of which is connected with said shaft by means of eccentrics and eccentric rods, the latter being connected thereto near its free end, and anadjustable connection between said members operable while the machine is ruiming to vary the amplitude of the vibrationstransmitted from one member to the other. n

5. In a shake mechanism, the combination with a rotating shaft, of power transmitting devices comprising two vibratory members pivoted to the frame, a pair of eccentrics and eccentric rods for reciprocating one of them,r

a pivotal connection between said members throw of the vibrations imparted from one to the other, and hand operated means for shifting the position of said pivoted connection while the machine is running.

6. In a shalremechanism, the combination with a rotatingshaft, of power transmitting devices comprising' two vibratory members pivoted to the iframe, eccentric means for reciprocating one 'of said members from said shaft, Aanadjustable pivotal connection between said members comprising a block slidably mounted on one of them and carrying VVtruimionsy journaled in bearing blocks slid ably rmounted on the Otheig'and adjusting ymeans operable while the machine is running.`

7. In a/shake mechanism, thecombination witha. rotating shaft, of powertransmitting devices comprising two vibratory members pivoted to the frame, eccentric means for reciprocating one of said members from said shaft, an adjustable pivotal,*connection between said members comprising a block slid-,l

surfaces of saidl movable parts',

mounted on said rocker, a pair of eccentrics andy yeccentric rods for reciprocating said rocker from said shaft, a bell-crank lever also-pivoted to the frame and having a bifurcated part embracingl said rocker, a block slidably mounted in ways carried by the respective arms of said bifurcated part, trunnions carried by said block .and journaled in said bearing blocks, and hand operated means forlshifting vthe position of said .trunnion carrier and said .bearing blocksre'latively to the axis of said rocker.

9. vA shake mechanism comprising a power shaft, a vvibratory member pivoted to the frame and receiving a reciprocatory motion from saidshaft, a second vibratory membeny a pivot connection between said vibratory members adjustably mounted upon one of the1n,-and means for adjusting said pivot connection while the shake mechanism is in operation.

10. In a shakemechanism, the combination with la driving shaft, of power transmitting devices comprising twovibratory members each jonrnaled in the frame,one:of them being connected be -reci-procate'd thereby, an adjustable pivot connection between said vibratory members, and means operable while the mechanism is in operation for adj usting` said vpivot connection towards and from a Zero position coincidentwith the axisof oscillation of one of said'members.

11. In a shake mechanism the combination with the driving shaft of power transmitting devices comprising two 'vibratory members each pivoted to the frame, said members bcring pivoted to one another by means of a connection adjustable towards and away from the axis of oscillation of one of them.

12. A shake mechanism; comprising. a power shaft, a vibratory member pivoted to the frame and receiving a reciprocatory motion from said shaft, a second vibra-tory member; y,said `members being' bifurcated and related together so that each has a part that lies in a plane extending between the bifurcations of the other, a pivot connection between said vibratory members adjustably mounted upon `one fof them; and means for adjusting said pivot connection while the shake mechanism is in operation.

13. The combination with a shake-trame7 of 'a shake mechanism therefor including a with said main shaft so as to rocker. and means for oscillating the same on its axis; driving means connected to the shake-frame; a pivotal connection between said rockerand driving means whereby the former actuates the latter; and means operable to shift the position of said pivotal connection toward and from the axis of oscillation of :the rocker, thereby to change the amplitude of movement imparted by the rocker to said driving means.

14. The combination with a sl alie-frame, of a shake mechanism 'therefor including a rocker-and means for oscillating the same on its axis; driving means connected to the shake-frame; a pivotal connection between said rocker and driving means whereby the former 'actuates the latter; and means operable while the shake mechanism is in operation to shift the position of said pivotal connection toward and from the axis of oscillation vof the rocker, thereby to change the amplitude of movement imparted by the rocker to said driving means.

15. The combination with a shake-frame, of a shake mechanism therefor including a rocker and means for oscillating the same on its axis; driving means connected to the shake-frame, said means including a lever; a pivotal connection between said rocker and said lever whereby .the former actuates the latter; and means operable to shift the position of said pivoted connection toward and from the axis of oscillation of sai d rocker and the fulcrum of said lever7 thereby to change the amplitude of movement imparted by the rocker to said driving means.

16. The combination with a shake-frame, of a shake mechanism therefor including a rocker and means for oscillating the same on its axis; driving means connected 'to the shake-frame; said means including a lever; a pivotal connection between said rocker and said lever whereby the former actuates the latter; and means operable while the shake mechanism is in .operation to shift the position 'ofsaid pivotal connection toward and from the axis of oscillation of said rocker and the fulcrum of said lever7 thereby to change'the amplitude of movement imparted by the rocker to said eriving' means.

1T. The combination with a shake-frame, of a shake mechanism therefor including a part driven from a source of power; a part connected to said shake-frame; a pivotal connection between 'said parts; and means operable to shift the position of said pivotal connection; thereby to vary the amplitude of movement imparted to the shake-frame by said shake-mechanism.

18.y The combination with a shake-frame, of a shake mechanism therefor including part driven from a source of power; a part connected to said shake-frame; a pivotal connection 'between said parts.; and means operable. t0 shift the position of. said pivotal connection While the shake mechanism is in operation, thereby to vary the amplitude of movement imparted to the shake-frame by said shake-mechanism.

19. The combination with the shake-frame, of a shake mechanism therefor including in its construction a sliding member adjustable to different positions in a slide-Way constituted by two oppositely positioned parallel surfaces, one of said surfaces being that of a plate or shoe the position of which is adjustable to take up Wear between the contacting surfaces of the sliding member and slide- Way.

In testimony whereof I have signed this specification.

FREDERICK A. BOWMAN.

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