US905436A - Mechanical movement. - Google Patents

Description

E. T. JGENSTON. MBGHANCAL MOVEMENT. APELIOATION 13mm FEB. 13, 1904. RM1-zml; MAR. 2s, 1.907.

R.' T. JOHNSTON,

` MECHANICAL MOVEMENT vAPI'LIUATION FILED FEB. 13, 1904. EENEWED MAR. 26 1907.

ggj, Patented De@ 1, 190s.

A SHEETS-SHEET 2.

R. 'I'. JOHNSTON. MGHANICAL MOVEMENT. APPLIOATION FILED 1113.13, 1904. RENEW/En 11.111,26, 1907.

Patented Dec. 1, 1908,

8 SHEETS-SHEET 3.

R. T. JOHNSTON.

MECHANICAL MOVEMENT.

4 APPLIUATION FILED Emma, 1904. BBNEWBD MAE. 2e, 1907. 905,436.

Patented Dec. 1.1908.

SHEETS-SHEET 4..

R. T. JOHNSTON. MECHANICAL MOVEMENT. APP'LIQATION FILED'FEBJS, 1904. RBNBWED MAR. 2s, 1907.

534(:3514936,.` f A Patented Dac; 1,1908.

6 SHEETS-SHEET 5.

I 11. T. JOHNSTON.

MEGHANICAL MOVEMENT.

APPLICATION FILED FBBJS, 1904. RENEWED MAR. 26, 190.7.

905,436. Patented Dee. 1, 190g.V

8 SHEETS-SHEET 6,

UNITED ISTATES; PATENT onirica.

ROBERT T. JOHNSTON, Ol" PLAINFIELD, NEW JERSEY, ASSIGNOR TO THE CAMPBELL PRINT- ING PRESS & MANUFACTURING COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW` YORK.

`Specification of Letters Patent.

MECHANICAL MOVEMENT'.

Patented Dec. 1, 1908.

'Application led. February 13, 1904, Serial o. 193,429. i Renewed March 26, 1907. Serial No. 364,647.

Be it known that I, Roisnirr T. JOHNSTON,

. of New Jersey, have invented a new and n illustrating the different positions that theparts assume during the operation. l l This invention has been designed as an useful Mechanical `Movement, of which the following is a specification.

, v The object of this invention is to provide a new and improved apparatus for converting-rotary niotion into rectilinearly reciprocating motion.

Tothis end, this invention consists of the parts and combinations of v parts as hereinafter described and more particularly pointed out in the claims at the end of this specification. l i

Inthe accompanying siX sheets of drawings, Figure l is a sectional View taken on the line l-l of Fig. 2. Fig. 2 is a sectional elevation taken on the line 2-2 of Fig. l. Fig. 3 is asectional elevation taken on the line 3 3 of Fig. l, and Figs-4 to 9 inclusive are .diagrams on a reduced scale improvement.upon the mechanicalmotions i i' l.which are disclosed in United States Letters Patent No. 570,586 granted in the name pf lHenry A. Wise `Wood, Nov. 13, 1896, and in United States Letters APatent No. 570,597,

granted Nov.3, 1896 inthe name of Vin A. field S. Huson.V

The construction herein disclosed ispi'imarily adapted for use as a bedniotion for printing presses, although it maybe used in any location, and in any class of machinery in which it may be desired to produce forward and backward movement, and while l shall describe my linvent-ion applied to printing presses, it is to be understood that ,l do not wish to be limited to this particular application of my invention. The printing `prcssbed to secure the best resultsl must be run at even speed during its forward and 'return strokes, and 'must be gradually .stopped and started vagain in reverse direc- Ations without jar or vibration.

Broadly considered an apparatus constructed according to this invention comtlie bedl to a state of rest and then start the same. in au opposite direction at a gradually accelerated speed, these reversing mechanisms Vbeing combined with a mechanism `forward and return motions.

mechanisms will be termed the reversing 5o mechanisms. l

In printing press motions of the type dise closed in the Wood and Husoii patents before referred to, the main driving mech anism comprises a driving pinion coperating with racks for giving the bed its main .In the construction of these-bed motions as actually employed the parts have been so timed that the driving pinion will make one complete turn for the main forward stroke of the bed; a half turn for the reversal at one end of the movement; a complete turn for the return stroke of the bed; and a half turnfor the reversal of the bed 4at the other end of'its 75 movement- That is to say, to complete a cycle of operation in bed motions of this class as heretofore constructed the driving pinion makes three complete'turns. Consid ering the times occupied in this classof bedmotions as heretofore constructed, one-third of the time is given to a forward motion at uniform speed; one-si`xth of the time is given to each reversal;` and the remaining onethird of the time is given to the return stroke at uniform speed. In actual practicea bed motions of this class can be run at high speeds, and with great efficiency v in the smaller sizes of printing presses. v

In constructing the heavier and larger sizes of printing presses it has been found desirable to allow more time for 1eveisals, and to shorten the periods allowed for the travel'of the bed atv uniform speeds.

Ln a mechanical movement constructed according'to this invention, a two-revolution driving pinion is employed, and the parts are so timed that the driving pinion will make a half turn during the forward motion of the bed at uniform speed; a half tu'rn for 100 a reversal Iat one endof its movement; a lia-lf turn for the return stroke at uniform speed; and a half turn for the reversal of the bed at the other end of its movement.

A mechanical movement constructed according to this invention is characterized by the use of tivo distinct reversing mechanisms.

`In the specific construction illustrated two separate reversing` pinions are employed.

These reversing pinionsare combined so frame 7, and on this rack-frame 7 are mount'- ed lthe two parallelo positelydisposed driving racks 8 and 9. ecured to the'underside of the bed 6 is a frame or bracket 10 which carries the short rack 11 engaged by' one of the oscillat pinions for reversing the bed at one .end vo its movement, as hereinafter described, and also carried by the frame or bracket is a short rack 12 for engaging the other one of the oscillating pinions for reversing the bed at the other end of its movement as hereinafter described. Formed or fastened to the side-frame4 is a bearing or journal-box 13, and in this bearing and in a bearin is mounted a shaft 15 which is the driving shaftof the machine, and on which may be mounted the usual ti ht and loose pulleys 16 and 17, by means o which power may be transmitted to the device.

'The tie-beam 20 connects the side-frames 4 and 5, and on this tiebeam ismounteda.

bracket 21 which has extendin arms 22 and 23, with bearings 25 and 26 ormed therewith.l At their ends, the arms 22 and 23 are provided with slide-bearings, and in these slide-bearings are mounted the arms of a reciprocating Iyoke 31. On the back of the yoke 31 is formed or fastened the rack 32, which rack 32 meshes with the underside of a gear 33 loosely mounted on the shaft 15, the gear 33 being held in place on said shaft between a collar 34 and the yoke 31, whereby said gear 33 is free to turn independently of 1 the driving shaft 15 on which it is mounted.

Mounted in the bearing 26 is a stud 40, and on this stud is a gear 41 and pinion 70. The gear 41 is driven from a pinion 50 fastened on the shaft 15. The reduction between the pinion 5() and gear 41 in the particular construction shown is two to one. Fastened on the side of gear 41 is a bracket which carries a crank-pin 43. The crankpin '43 is set cn the pitch circumference of the gear 41, and this crank-pin 43 carries a block 42 fitted into the vertical slot 39 in the yoke 31. By means of this construction the yoke 31 will be reciprocated back land forth at a speed which isthc resultant of a crankmovementja'nd thereby the gear 33 will beoscillated at'proper speed to coperate with the short rack l2, as hereinafter described,

to reverse the motion of the bed at one end of its travel.

avesse.'

pinion l/which meshes with a gear 52. The

gear 52l is fastened on the shaft 53 which is Journaled in an eccentric bushingv 54. '1(he gear 52 coperates with the top and bottom racksr8and 9 being the main driving pinion through which the bed is given its mam for-` ward and backward reciproeations. The ec- `centric bushing has a liange 55, and as shown iii Fig. 3,.this flange has teeth 56 which mesh withteeth formed on the end of a lever 57 the lever 57 being pivoted on a stud. 58 secured inthe bracket 21. The pinion 70 upon the shaft 40 meshes into a 'gear 71:2fastened on a shaft 81, which shaft 81- .is journaled in the side-frames of the-press. Fastened on the shaft 8 1 is a cam 80. A yoke 61 is mounted on square block 62 on the shaft 81, and the yoke 61 has rollers 63 and 64' which engage the cam'SO. The`cam 8O has two surfaces 82 and 83 connected by easy Vinclines. In making one revolution, the cam will move the yoke 61 forward and backward. The' motion of the yoke imparts a vibratory motion to the lever 57 which will oscillate the bushing 54 to raise and lower the gear 52 to laterally engage the racks 8 and 9.

`The parts as thus far vdescribed are substantially 'the same as those disclosed in the atA United States Letters Patent No. 570,586 to 1H Henry A. Wise Wood before. referred to, eX-

cept that the main racks 8 and 9 are only l one-half of the length of the corresponding racks shown in said Wood patent, while the reduction between the pinion 70 and gear 71 is'two to one instead of three to one, and the reversing pinion 33 is wider than the rack 12 which coperates therewith.

lUu

In the construction thus far referred to the gear 52 and racks coperating therewith constitute the main driving mechanism,

while the oscillating gear 33 and the short rack 12 constitute one of the reversing meh-` anisms for reversing the bed at one end ofv its travel. For reversing the bed at the opposite end of its travel, in the specific construction illust-rated herein, I employ a second reversing pinion which meshes with and is driven from the reversing pinion 33. As

shown most clearly in Fig. 1, a bracket is bolted on to and extends up from the cross,- tie 20. Extending from the bracket 85 is a stud 86, and journaled 0n t-he studl 86 is a second reversing pinion S7'. The reversing pinions 33 and 87 mesh together for a part 'only of the -width of their faces, one side of the reversing pinion 33 being left free to coperate with the short rack 12, while the opposite sideof the reversing pinion 87 is left free to coperate with the short rack 1l, the short racks 11 and 12 being secured out of line with each other for this purpose.

The operation of a complete mechanical4 movement as thus constructed can be. mos* readily understood by a consideration of the 'will properly engage diagrams shown in Figs. si to 9 inclusive.

Referring to said figures, in Fig. t, the bed' is shown as list completing its direct stroke to the left; the gear just leaving the rack S; and the oscillating gear 33 just engaging the rack l2 to commence the reversing movement. In this position the crank-pin is at its lowest point, and the yoke is moving to the right at a speed equal to the peripheral speed of the gear whereby the gear 33 its rack l2, and will more the bed to the Alett as a speed commencing at the maximum and gradually deereasing to zero as the crank 43 approaches the horizontal, or until the parts assume the position shown in Fig. ln other Words, by a quarter revolution ot' the crank the bed is gradually retarded and brought to rest in a movementequal to the radius of the crank pin t3 or to the pitch radius of the pinion During the next quarter revolution ot' the'crank-pin the yoke Will be moved to the left a distance equal to the crank radius at a speedv gradually increasingur from zero to the maxin'numor until the parts assume the position shown in Fig. 6, the motion being transmitted to the bed by means ot' the rack l2 and oscillating gear 33.

During this reversing` action the cam 80 has osrillated the bushing;` 54, and the-driving gear 3Q has lowered to engage the rack 9. During the next halt revolution of the driving gear 52 the bed will be moved to the right a distance 4equal to one-half the'pitch cireuinference of the driving gez'ub, or until the parts assume the position shown in Fig. T. ln this position the gear 52 is iust leaving the rack i) and the second reversing pinion HT is turning` in the proper diret-tion to engage the short rack 1l. During the next quarter revolution of the gear 52 the hed will move to the right under the control of the. second reversing pinion ST a distance equal to the crank radius at a. speed commencing at the maximum and gradually decreasing to zero, or until the parts assumo the position shown in` Fig. 8, which is the right-hand extreme oi the travel ol thel hed. During the next quarter revolution ot' the crank-pin 43 the reversing pinion H7 .will move the bed to the lett a distance equal to the crank radius at a speed commencing at Zero and gradually accelerating to the maximum, or until the parts assumevthe position shown in Fig. 9. During the reversal of the bed by the reversing pinion Si the cam S0 will oscillate the bushing 54 to raise the driving` gear :32 so that the same will engage the rack 8 shown vin Fig. 9. .During the next halt revolution ot' the lgear 52 the hed will be moved to the lei't a distance equal to one-halt the pitch cireumirrenre of the gear 53, so that the parts will again assume the position shown in Fig. fl, completing the cycle. i

Operation in each direction, and a half turn for each reversal. That is to say, by using two separate reversing pinions, one for reversing the bed at each end of its movement, and, which are crank-actuated, but which turn oppositely, I am enabled to provide a mechanical movement in which the time of each main forward and backwardmovement is the same as the time occupied for each reversal, and it follows from this that I have provided a simple and eliicient form of'two-revolution bed motion for printing presses, or for other purposes in which each reversal occupies one-quarter of the time of an entire cycle; Whereas, in ordinary tln'ee-revolution bed motions, a reversal is only allowed one-sixth of; the entire time of 4 a cycle.

l am aware that numerous changes may be made in the operative parts of a mechanical movementv by those who are skilled in the art without departing from the scope of my invention as ex 'ressed in the claims. t do not wish, there ore, to'be limited to the constructions l haveherein shown and `described; nor, for reasons before stated, do l wish to be limited to the application of my invention to printing presses; but

What l' do claim and desire to secure by Letters Patent of the United States is l; The combination ot' a reciprocating bed or member, a main driving mechanism theretor, and two separate relatively oppositely moving reversing pinions, one for reversing the motion of the bed at one end of its stroke, and thel other for reversing the motion of the bed at the other end of its stroke.

2. The combination of a reciprocating bed or member` main driving` mechanism theretor, and two separate reversing pinions, one

for reversing the motion of the bed at one id ot' its stroke, and the other for reversing the motion ofthe hed at the other end of its stroke, said reversing pinions being driven so that their points otengagement turn relatively oppositely with respect to each other.

3. The combination ot' a reciprocating bed or member, a main driving mechanism comprising a driving` gear and racks, and two' sepa rate reversing pinions, one for reversing the bed at each end ot its stroke. said pinions being crank-actuated, and having their points oi" engagement with the bed moving relatively oppositely with vrespect to each other.

et. The combination of areciprocating bed or member, a main driving mechanism therefor, a crank-actuated slide, and two independentreversing pinions relatively oppositely actuated from the slide for reverslng the, motion of the bed at the opposite end of its stroke.

5. The combination of a reciprocating bed or member, a crank-actuated slide, a reversing pinin mounted to'osciiiate on a iiried axis, a rack carried by the slide and meshlng with vthe lower side of the reversing pinion, and a second reversing pinion meshing With and driven from the first reversing pinion, said reversing pinions meshing with racks carried by the bed for reversing the motion `of the bed at opposite ends of its stroke.

rivi ng mechanism Maese;

comprising a two-revolution gear and racks coperating therewith to give the reciproeating bed or member its main forward stroke during .a half turn of the driving gear, and to give the reciprocating bed or member. its main backward stroke during a half turn of the riving gear, a reversing-pinion for reversing the movement of the bed at one end ofits stroke during a half turn of the driving gear, and a second reversing pinion for reversing the movement of the bed atv the other end of its stroke during the last half turn ofthe driving gear.

In testimony whereof I have hereunto set my hand, in the presence of two'subscribing W1tnesses. l

ROBERT T. JOHNSTON.

Witnesses i VINCENT YV. NASH,

Y iV. J. KITCHEN.

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