US1652470A - dubuc - Google Patents

Description

e. 13, 7;" L. M. C. A. DUBUC PRINTING MACHINE 3 Sheets-Sheet 1 L. M. C. A. DUBUC PRINTING MACHINE Filed Feb.1l. 1926 5 Sheets-Sheet 2 De@v la, w22 mz'm L. M. C. A. DUEUC PRINTING MACHINE.

Fil Feb 11. 192e 3 shets-sheet 3 EN f3@ 7 0 //3 /30 LOUIS MATE-REU CHARLES NICE' DUBUC, Fvk TOULOU'SE, FRANCE, ASSIGNOR ITO BJSIRVEN, F IERS, FRANCE, A LETLITED JO-TT-STOCK COM'EANY.

FRNTING IACHINE.

Application led February 11, 1926, Serial No. 37,649, and in France February 14, 1925. I

The present invention relates to various improvements in printing machines, the object of these improvements being specially to avoid the aforesaid inconveniences. n

These improvements relate firstly to the mechanism for. giving the imposing` suri face ofvprinting` machines equal reciprocating' movements in opposite directions, and secondly to mechanism for carrying or accompanying the imposing surface to each end of its movements with the object of keepingl it in very exact positions. i

A, printing machine made in accordance with the invention consist-s essentially in having the driving shaft connected with an intermediate shaft the pinion of which is in mesh with a rack fixed to the imposing surface, the transmission mechanism between these two shafts being such that the said rack acquires alternating rectilinear movements with a constant speed for nearly all the travel vof the imposing surface.

The invention also comprises a'special form of construction of the aforesaid machine consisting essentially in that the in,

i termediate shaft, carrying a pinion in mesh with the rack of the imposing surface, also carries a pinion interposed between two wheels adapted to be rotated in opposite directions by the driving shaft, these two wheels having teeth only on a part of their exterior circumference (about half their circumference) in such a way that one of the wheels makes the intermediate shaft turn in one direction to produce a forward motion ofthe rack and imposing surface, this said wheel being then released from the inten mediate shaft the pinion of which now meshes with the other half-toothed wheel which drives it in the opposite direction tothe preceding movement, and this new movement of the intermediate shaft pro duces the return movement of the rack and imposing surface.

The invention also comprises a printing machine with a mechanism operating at the end of the travel and characterized in that, at the moment when the driving shaft of the imposing surface is not in mesh with either of the two devices for moving the imposing surface in opposite directions, the rack of the imposing surface meshes with a pinion orsector of the same diameter and modulus as the pinion driving the imposing surface and having the same speed. as that -of this driving pinion in such a way that the imposing surface continues to move at the same rateof speed.

The invention finally comprises other characteristic features and their different combinations hereinafter described.

A printing machine made in accordance with the invention is shown, by way of eX- ample, in lthe accompanying4 drawings, in which t Eig. 1 is a plan view of the entire mechan1sm.

Fig. 2 is a section on line 2, 2, of Fig. 1.

Fig. 3 is a section on line 3, 3 of Fig. 1.

Fig. 4: is a section on line 1, i of Fig. 1.

Fig. 5 shows partly in section and partly in elevation the device which accompanies or carries the imposing surface at the end of its travel. A

Fig. L@shows a detail of the device shown in Fig. 5.

The mechanism for giving the imposing surface uniform movements in opposite directions, consists of a driving shaft with pulleys 101 and fly-wheel 102; this shaft drives through the agency of a train of spur gears 103, an intermediate shaft 104. Tiis intermediate shaft 104e runs from one side of the machine frame to the other, and on the end opposite its driven end this shaft 104 is furnished with a wheel 105 only toothed on a thirdof its circumference, viz, a sector of 1200.

On this same shaft 104 and by the side of the wheel 105 there is fixed an internally toothed wheel 106 having teeth only on one third of its circumference in a similar way to the wheel 105, viz, on a sector 1200.

The wheels 105 and 106 (see Fig. 3) which are joined together and interdependent alternately and `respectively work the pinions 107 and 10S which are also joined together and fixed on the end of an intermedia te shaft 110. The diametei1 of the pitchr circle of the wheel 106 is equal to twice the diameter of the pitch circle of the wheel 105. The pitch circle of the pinion 108 is equal to twice the diameter' of the pitch circle of the pinion 107.

|This ratio between the diameters 'of the said pitch circles make it possible for the shaft 1041L to drive the shaft 110 at the same rate of speed, whether the transmission is by the train of gearing 105, 107 or bythe train 106, 108.

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' thet v*the impe At the other end ot the intermediate sha it is lined n pinion 111, ot the seme diameter es the pinion 108. This pinion 111 Works a rack 112 iixed to the imposing surface 113.

The atei eaid device works as follows:

1n its initial position, the pinion 108 is in mesh With the wheel 106 Which vturns in the direction 1111-; therefore the pinion 108 turns in the direction 115. This pinion 108 thus produces parallel motion of the rack `'1:12 and imposing eurtface 113, in thedireclion 116.

The inlpoeing eur-face 113 more@l forward ,until the .vheel ie released Afrom the teeth ,of the wheellOS; het .fis the Wheel continues to' turn in he direction 1111, eonie inet-:inte after .the pinion 108 disengaged Afrom the Wheel 106, thepinion 107 meshes Withthe toothed 'part of Wheel 105. @oneequently, under the action oit the Wheel 105 thepinion 107 ie feet in motion in thedirection 11S.

Thefpinion 111 :ileso turne in the direct-ion 11S lto produce movement ci the imposingI surface 113 in tlie direction 119.

The multiplication ratio of 105 to 107 being the seine as that of 106 to 108, We can eee' that Vthe iriarzi'llel incvenients` of theeirnposing` surface will he made at the saine rate of speed in the directione 11h and 110.

Briefly, the inechenisi'n already described makes .it poesihle, hy the aid oft the driving shaft 100 turning at a Speed, eonfistent in rate and direct-ion, to produce reetilinea..I 'to and fro motion of the imposing' Surface 113, each. of these movements having aeonetant speed during the .respective periods when the Wheels .105, ,1 5 ieepeeti."ely drive the pinion@4 107, 108. Y

It is to loe noted that in the device T have described theehzift for' driving the imposing surface, 4becomesv free during a very short time when it is no longer" in mesh either with the .interior toothed wheel 10G or the toothed Sector 105: it ie I'heretore neceeeniy i' surface 113 at the end oi? e. ucconipn. icrl or carried and hiept in vei emit-t if-.v'itir .lxhy me: if of un. end of A meehanii.. llhie :mid mecha "ein muet ineeh with the impoainl; Surface, a little heterethe driving elm t't 110 of Ythie imposing surface tieneniey tree, in auch n. wziythnt there is no interruption in the .vonling; and movement otlthie iniposin Surface, the end of travel mechanism Simply talking' the place of the drivingr Shaft 110.

This result can evidently only he attained oncondition :that the end of travel .mechanisin, in meshing with the imposing` eurfece, will give it the saine rate of speed .afi its driving` Sl-ioiit 110, otherwise all the machine would .he dislocated.

Finally, the iniposingeinfece must always have the .saine speed .Whether d shaft 110 or ite end of trk vel ite travel chou ianiero,

ven by' its' The nforeeeid mechani-:Ltm mede :accordingD to the present invention permite these diiiieulties to he overcome. It consists essentially of:

1. A driving crank fixed on the endA or the driving shaft 100.

9.. Aeonnecting har 121 guided in slides 122, -1, whereby it moves With a rectilinear motion. This hor 121 hns n to and it'ro mo tion under the action olf the driving` (freni: 120.

3. Two driven cranksl eef-iential cl-iaracteristie rit-being cranks with arins'oli variable length; these tivo cranks are workedfroin the eonnectinghar A121 'by the :iid of .a device hereinafter,described.

These two'v cranks- 125 are isi-miler and Y.consist off: the crankarm 120 (Fig. 5) formed hy a .member which canrnn insidet-Wo slides 127, 128 these twosfridslides,127,112.8,heing -formed in one with a hess A129 fixed on the end ot the shaft 130.

'Il'ielength of the arinlQis regulated hy the displacement of a roller 131, -ixed to the rear part. of this arm `126.

The roller 1311iS compelled to run inside n Slide 132 (Fig. 6) g the portionof thiselide 132 within thel angle .a is cnt'to the are oi a circle having for its centre the ypoint O on the elle et the sterft-130'.

From oney Side to the other of :the limite' of the angle a the Vslide iS cut to tree ol? curvature the convex parte of which foce upwards.

On the.irontsurfaceofthe arm 120, opposite to tha-t .which .carries the .roller 131 ie lined. the shaft 134 01.9, slide 135 which moves between two guides 1127, '128 formed inone with the connecting bar 121.

O11 the shafts 130 :are iixed ASectors or :pin ions 1538 lniving the same diameter and modulus astliepi-nion 1.11.\vhieh drivenl the in'xposing xeurface 113. i

It .will he eeen that the rack 11i/l, "ii-Kod to the imposing sur' 113, will he .acuzite'd :it .the reciprocating movement oit the imposing Siu-.Face by one oritlie other ofthe `will he penned over hy the ng already n. l \vl1i|f;tthe inch 112 he K in Vme h with @neet .the V'pinione .138, the pin# ione 10i' or 10S nreiagan in ineeh with one ollhe ` wheels 105 or 100.

lt can easily bo Seen tlmt during' this t' 2 the inoven'lent olthe crank lltlv'i-lfl he etrictly :inliannony witli'tlnrtof crnnl YConsequently the .rotary vmotion' of .pinionsI 1315 will il in harmony with that of 111r the time of .mine enten-it of elfle .1212.

The :xiioreenid =rneehanisin Works lows: i f

inthe initial position the pinion 108 turns .the Slireetion '115' under theoetion :the

the portion of circular treev o'l the as fol- 125 Whichlnive the 4 `,inch-romeni being .regulated ov ther rie is then vdriven only by the pinion 138 the motion of which is regulated by thatvv of tbe connecting member 121. But the operation is regulated so that the member 121, under the action of the crank 120, then reaches one of the ends of its travel. Consequently, owing to the form of the slide 132 in which the roller 131 runs, the pinion 138 will slow down in rotation in the direction 115 and come to a stop and start again in the opposite direction 118, 1) and also produce a change of direction in the movement of thev rack attached to the imposingsurface 113 which will start off in the direction 1 19.

This movement of the rack 112 will cause engagement of the pinion 107 with the wheel 105, at the instant when the first tooth of this wheel 105, which has continued in motion, will mesh with 107.

Thus motion of the shaft 110 is reversed; and this said shaft drives the rack 112 and the imposing surface 113 in a direction opposite to the preceding` movement and this brings the imposing surface into its initial position.

vWhat I claim as my invention and desire to secure by Letters Patent is 1. ln a printing machine the following combination: an imposing surface; a rack fixed to the imposing' surface; a driven shaft for the imposing surface; a first pinion fixed to the driving shaft and in mesh with the rack; a second pinion fixed to the driven shaft; an intermediate shaft two wheels only toothed on a` part of their circumference, one on the exterior of its rim and the other on the interior, rthese two said wheels being carried on the-intermediate shaft and alternately meshingv with the second pinion of the driven shaft in such a` way that this driven shaft. and consequently the imposing surface acquire movements in the opposite direction according` as one or other of the half toothed wheels meshes with second pinion of the driven shaft; a driving shaft, and a transmission device placed between the driving shaft and the intermediate shaft.

2. ln a printing machine the following` combination: an imposing` surface; a rack fixed to the said imposing surface; a driven shaft for this imposing surface; a first pin ion fixed to the shaft, and meshing with the rack; two joined pinions fixed to the driven shaft; an intermediate shaft, two wheels only toothed on part of their circumference, one on the exterior and the other on the interior. these two said wheels being carried on the intermediate shaft andmeshing respectively and alternately 'with the two joined pinions of the driven shaft in auch a way that this driven shaft and consecpiently thc imposing surface acrpiire movements ink Vthe opposite direction according as one or other of the half toothed wheels meshes with the corresponding pinion of the driven shaft; a driving shaft; a transmission device placed between this driving shaft and the intermediate shaft.

3. In a printing machine the following combination: an imposing surface; a rack fixed to said imposing surface, a driven shaft for the imposing surface; a. pinion fixed to the said shaft and meshing with the rack; a driving shaft; means inserted between the drivingl shaft and the driven shaft, these said means giving' the driven shaft and consequently the imposing surface tovand fro movements; two end of travel pinions of the same diameter and modulus as the driving pinion of the imposing surface, these pinions being placed at the two extren ities of the machine so as to mesh at the end of travel with the rack of the imposing surface and driving means giving these two pinions rates of speed equivalent to those of the driving pinion.

4. In a. printing machine the following combination: an imposing surface; a rack fixed to said imposing surface; a driven shaft for the imposing surface; a pinion fixed to the said shaft and meshing with the rack; a driving shaft; means inserted'between the driving shaft and the driven shaft, these said means giving the driven shaft and consequently the imposing surface to and fro motions; two end of travel pinions of the same diameter and modulus as the pinion for working the imposing surface these sait pinions being placed at the two extremities of the machine so as to mesh at the end of travel with the rack of the imposing surface; ttwo cranks of variable length fixed respertively on the two end of travel pinions :i crank with an invariable length lixed on the driving shaft; means connecting the pins of these cranks; means for modifying the length of the two cranks of the two end of travel pinions, in such a way that the variations in the length of these cranks compensates for the differences in linear speeds produced by working the driving shaft with the crank and thus finally enables the same speed to be obtained on the end of travel pinions as that on the pinion working the imposing surface.

5. In a printing machine the following combination; an imposing surface; a rack fixed to said imposing surface; a driven shaft for the imposing surface; a pinion lili iixed on the said shaft and meshing with the raolr; a driving shaft; means interposcd between thel driving` shaft and the driven shaft these said means giving the driven shaft and Consequently theimposing surface to and fro movements; two end oit travel pinions of the same diameter and modulus as the pinion Yfor driving the imposing surface, these said pinions being placed at the tivo extremities of the machine so as to mesh at the end. of travel with the iaok of the imposing surface; two 'cranks ot variablev length ixed respectively on the two end or travel pinions, each of these cranks consisting oit a slidingl part engaged in an eccentric slide or the frame; thus producing an a uton variation in length of the crank darinb rotations; a crank of? invariable length ti e on the driving shaft and means Connecting the pins of these cranks. 20

In testimony whereof I atlix my signature.

LOUIS MATHIEU CHARLES ANICET DUBUC.

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