US2545539A - Varnish applicator mechanism for sheet varnishers - Google Patents

Description

March 20, 1951 E. w. BELLUCHE ETAL VARNISH APPLICATOR MECHANISM FOR SHEET VARNISHERS 5 Sheets-Sheet 1 Original Filed Nov. 30, 1942 Defecfive Ghee! Discard Heed Cylinder m n m v I I I L Elm I uah Frank 591M017;

March 20, 1951 E. w. BELLUCHE ET AL 2,545,539

VARNISH APPLICATOR MECHANISM FOR SHEET VARNISHERS Original Filed NOV. 30, 1942 5 Sheets-Sheet 2 'llll HIE-mum 3 9 m E/m r W. BEZ/L/Eh Fnk H-5PZ/U0h March 1951 E. w. BELLUCHE ET AL 2,545,539

VARNISH APPLICATOR MECHANISM FOR SHEET VARNISHERS 5 Sheets-Sheet 3 prigihal Filed Nov. 50, 1942 F Fixed Center's EZmEr W. EEZZUEZIE Frank R. EEZZUEZ'ZE' March 20, 1951 E. w. BELLUCHE ET AL 2,545,539

VARNISH APPLICATOR MECHANISM FOR SHEET VARNISHERS Original Filed Nov. 30. 1942 5 Sheets-Sheet 4 .llm l v $4M Elm z" W. Emiluah Frank R E75 [LID/7E March 20, 1951 E. w. BELLUCHE ET AL 2,545,539

VARNISH APPLICATOR MECHANISM FOR SHEET VARNISHERS Original Filed Nov. 30, 1942 5 Sheets-Sheet 5 Elmer W. EIEZZUEZYE F a REJEZZUEZYE &

Patented Mar. 20, 1951 VARNISH APPLICATOR MECHANISM FOR SHEET VARNISHERS Elmer W. Belluche and Frank R. Belluche,

Racine, Wis, assignors to The Christensen Machine Company, Racine, Wis., a corporation of Wisconsin Original application November 30, 1942, Serial No. 467,370. Divided and this application September 21, 1946, Serial No. 698,418

This invention relates to the printing art, and is particularly directed to varnishing machines, being a division of the co-pending application, Serial No. 467,370, filed November 30, 1942, now Patent No. 2,424,732. i

Broadly, it is an 'object of this invention to provide means for protecting the varnish cylinder of varnishers against receiving a coating of varnish in the event a sheet is not fed thereto, which occurs when an imperfect sheet is presented at the front guides of the machine.

Inasmuch as this invention contemplates allowing the machine to continue to operate notwithstanding the feeding of a defective sheet, as fully brought out in the aforesaid application, now Patent No. 2,424,732, a sheet already on the impression or varnish cylinder is delivered in the usual Way.

Hence, the impression or varnish cylinder, at least for one cycle, runs naked. To prevent an impression on the naked cylinder the present invention has as another of its objects to provide means for automaticallyopening the printing or varnishing couple by effecting retraction of the plate cylinders or the varnishing roll away from the impression cylinder concomitantly with the rejection of the imperfect sheet.

In this respect it is more specifically an ob ject of this invention to provide a releasable latch mechanism for holding the varnish roll or plate cylinders in their operative positions, which latch mechanism is adapted to be tripped in consequence to the actuation of the trip mechanism in response to the presentation of an imperfect sheet at the front guide;

Whenever a varnisher is stopped there is always the possibility that the varnish on the applicator rolls and in the fountain will set. Hence, it is desirable to keep the applicator rolls running. In varnishers heretofore in use no provision was made for this other than to move the varnish roll away from the impression cylinder without disconnecting it from the drive of the machine so that the machine could be run empty,

14 Claims.

venience the present invention also has as one of its objects, the provision of an improved varnish applicator assembly so designed and constructed that access to all parts thereof is easily had.

With the above and other objects in view which will appear as the description proceeds, this invention resides in the novel construction, combination and arrangement of parts substantially as hereinafter described and more particularly defined by the appended claims, it being understood that such changes in the precise embodiment of the hereindisclosed invention may be made as some within the scope of the claims.

The accompanying drawings illustrate one complete example of the physical embodiment of the invention constructed according to the best mode so far devised for the practical application of the principles thereof, and in which:

Figure 1 is aside view of a varnishing machine diagrammatically illustrating the elements with which this invention is concerned;

Figure 2 is a feed side viewof a varnishing machine embodying this invention and showing the parts diagrammatically illustrated in Figure 1;

Figure 3 is a perspective view of the levers and linkage through which response of the detector finger upon presentation of an imperfect sheet at the front guide of the machine acts to prevent transfer of the defective sheet to the impression cylinder andsimultaneously retracts the varnish applying roll;

Figure 4 is a side view of the varnish applicator assembly illustrating the same in its retracted position with the varnish applying roll spaced from the impression or varnish cylinder;

Figure 5 is a detail perspective view of the adjusting bushing and screw used to adjust the position of the varnish roll with respect to the gauge roll;

Figure 6 is a cross sectional view through the varnish applicator assembly, illustrating the parts in their operative positions;

Figure 7 is a cross sectional view similar to Figure 6 but showing the varnish applicator assembly moved out and the varnish roll swung back; and

Figure 8 is a gear side view of the machine illustrating particularly the varnish applicator assembly moved out and being driven by its own independent motor.

Referring now particularly to the accompanying drawings, in which like numerals indicate like parts, the numeral 5 designates the impression or varnish cylinder on which the sheets are 3 carried in their passage past a varnish applicator, including a varnish roll 6.

The sheets are fed singly to the varnish cylinder by a feed .cylinder 1. Both these cylinders have the usual'grippers and at their point of tangency, the sheets are transferred from the feed cylinder to the varnish cylinder through suitable manipulation of the grippers.

A feeder of any suitable design presents the sheets S to the front guide 8 of the machine, which is located above the feed;cylinder. If the sheet is perfect it is transferred to the impression cylinder and thereby carried'past the varnish roll to be presented to the gripper bars 9 of an endless chain conveyor H], which carries the varnish sheets through a drying chamber, notshown.

If the sheet is defective, as when a corner .portion thereof is turned over a detector finger I I at the front guide is allowed to remain in itsnormal position whereupon the functioning of the trip "mechanism controlled by the detector finger actuates mechanism to be hereinafter described, by which the grippers on the feed and varnish cylinders are left closed as they pass their transfer point so that the defective sheet which has been taken'by the feed cylinder is not transferred to the varnish cylinder but is carried around to a discharge point and dropped into a receptacle l2 adapted to hold the discard pile.

The response of the trip mechanism to prevent transfer of the'sheet to the impression or varnish cylinder is accompanied by retraction of the varnish roll away from the varnish cylinder to preclude the application of varnish onto the naked cylinder, for as'noted hereinbefore, the rejection of the imperfect sheet does not entail stopping the machine. Instead the machine continues to operate and a sheet on'the varnish cylinder isdelivered therefrom in the usual Way so that the varnish cylinder runs naked until the next proper sheet is transferredtheretoby the feed cylinder.

As is customaryinprinting machines, the feed and varnish cylinders are supported 'by side frames l3, the feed cylinderzbeingmounted on a shaft [4 andthe impression'or varnishcylinder on a shaft IS.

The grippers .(not shown) of the feed andzvarnish cylinders may be of anysuitable form'and need not be specifically defined exceptto :point out that'the opening of the grippers at the'transfer point where the sheetiis transferred from the feed cylinder to the varnish cylinderis controlled by retractible cams l 8 'and l 9.

These cams are normally :held :in their operative positions by :retractible "supports .--in the form of hell crank levers 2B and 2 Lrespectively.

'When the cams are'in their operativepositions, the cam following rollers 'of the grippers riding ontoandover the cams open thergrippers at the proper time to eifect transfer of the sheet, but when the cams are permitted to. swing to their inoperative positions, as a result of retraction of the supportsle .andll, the grippers remain closed. Thus a defective sheet that enters the machineand is pickedup by-the grippers on the feed cylinder, if not transferred to the impression .cylinder is carried .to the discharge point where it is released'to "pass down to a discard pile.

The cam supporting "bell crank levers 28 and 2! are held in their operative positions by a linkage restrained against movement to a releasing position by'a latch-indicated generally by the number 22. The linkage by which the cam supports are held upc'ompr-ises a lever 23- fixed we sionrspring 28Iwhich pulls down on the lever. 'is'to be'observed that adjustment of the stop 27 shaft 24 which is journaled in the adjacent side frame of the machine, the lever 23 being inside the frame.

Links 25. and 26 connect the outer end of the lever 23 with thecam supporting levers.2i3 and 2| respectively so that as long as the lever 23 is held .in its normal raised position defined by an adjustable stop 21, the cam supports hold the cams instheir proper operative positions. Assurance that the lever 23 will remain in its normal position definedlby the stop 27 is provided by a tensets the location-of the cams i8 and i9.

-A horizontal bar--29 connecting the lever 23 with-the: latch releasably holds the lever in its normal position. This bar 2.) has one end thereof connected to an arm of the lever 23 and its other "end is connected to a .lever 30 medially pivoted on a fixed stub shaft 3|. A compression spring '32 actingragainst the lever 3il yieldingly'urgesthe same in a counterclockwise:ldirection '(in .1Figure 3) and tends to push-the horizontal bar-29 to the left. Such'leftward shiftingof the bar:29 would release the gripper opening cams forzgravitational descent .to inoperative :po sitionsibut as noted hereinbefore i the latch I 22 :restrains the shifting of the bar.

The latch'ZZ comprises aLnotchJ33 infthe':bar 2S .and a flange 34carried byia'ipin 35Ialld engaging in the notch. The pini35 issec.uredto 'a lever 36 which is pivoted as at "37" upon aafixed support and'these tparts'iarei-so arranged that clockwise rotation of .the lever 36 IfiFigure 3) about its pivotal support is required to disengage the latch 22. A'tensi'onspring (notshown) yield- .ingly restrains such :clockwise "rotation :of the lever 36, but when a defective sheet is'presented at thei'front guides of the'machine, the lever 36 is rockedabout its ipivotal support in a clockwise direction to-releaseithe" latch 22 and allow the cams to. swing to theirinoperative positions.

To'so zactuate'the lever td in responseto the presentation .of a'defective sheet at the'front guides;ailever arm 38'fixed to a shaft'39 carries ia'finger dll-atits'lower outer'end inline with a roller on the end'of the, lever 36. An adjustable stop (not shown) defines the normal position of the lever arm-38 fromwhich the arm swings outwardly in a counterclockwisedirection to-rock the lever 36 upon 'oscillationof the-shaft 39 in a counterclockwise direction.

Such-oscillation of the-shaft -39 is brought "about in the following manner: the shaft 39 which extends across the-entire width of the machine has 'a plurality of levers 42 fixed thereto which in thenormal position of the shaft 39 extend substantially horizontally toward the direction from which the sheets are fed. The

levers'42 are in :exact alignment andthe number arm pivoted "to a fixed-support as at 4.5 and connected at its OuterJend by-Ja IinkAB'to'a lever ATfixedtoa rocki'shaftAB. LTheshaft 2-8 is continuously oscillated'by a1cam49 acting through a camfollowerifill mountedtonia'leverti' which in turn is connectedwith"the' shaft' lil through a link 52 and a lever 53.

The cam 49 is 'mounted soni'the. shaft .14 of the feed cylinder and has a concentric high extending about substantially the entire circumference of the cam with a relatively short depression 55 which aligns with the cam follower 5G in time to cause the detector finger to descend and feel for a sheet just as it is being presented to the front guide of the machine. A compression spring 5| acting against the lever 5| causes the cam roller fall to follow the cam and reciprocates the shaft 48 as called for by the cam.

If the sheet being presented to the front guide is in all respects proper the detector fingers will be engaged by the leading edge of the sheet and swung out of their normal positions to disalign their upper ends from the notches in the pendants 43. Hence, when the detector fingers are lifted by the oscillation of the shaft 48 they will have no effect upon the cross shaft 39 and the latch 22 will be left engaged.

However, if the sheet presented to the front guide is defective as would be the case if the front edge were turned over at one side, at least one of the detector fingers would not be moved out of alignment with the notch in its associated pendant l3 and consequently the elevation of that detector finger would result in counterclockwise oscillation of the cross shaft 39.

Such oscillation of the cross shaft 39, as noted hereinbefore, effects disengagement of the latch 22 with the result that the gripper opening cams drop down out of their operative positions so that the defective sheet, which would be carried along by the feed cylinder, would not be trans ferred to the impression or varnish cylinder. Instead the defective sheet would be carried around to the point at which the grippers of the feed cylinder are tumbled to their open positions; whereupon the sheet would be released for passage to the discard pile.

With the next revolution of the feed cylinder the gripper opening cams would be restored to their normal operative positions and the latch 22 reengaged. This is accomplished by a resetting cam 56 also revolving with the feed cylinder and in line with a cam follower 51 on the lower end of the medially pivoted lever 30. The

lever 36 being connected to the horizontal bar 29 pulls the same back against the compression of the spring 32 as the resetting cam 56 passes under the cam following roller 51 to reengage the latch 22 and restore the cam supports 26 and 2! to their positions holding the gripper opening cams operative.

Concomitantly with the release of the gripper opening cams l8 and 19 to release the latch 22 in the manner described, the varnish roll 6 is caused to retract away from the surface of the impression or varnish cylinder so as to preclude the application of varnish to the cylinder during the time it travels without carrying a sheet.

Although the varnish roll or applicator involves considerable structure through which various improvements'are achieved, for an understanding of the way in which release of the latch 22 effects retraction of the varnish roll it is sufficient to note that the roll and its associated structure are supported by a lever 58 pivoted as at 59 to a fixed support and in turn supported against dropping by a bell crank lever 60.

The bell crank lever 63 is fixed to a cross shaft 6| which extends across the entire machine, and one arm of the bell crank lever carries a roller 82 and the other arm has a stub shaft 63 projecting therefrom. The roller 62 engages the finished surface of a pad 64 on the underside of the lever 58, and the stub shaft 63 is engaged by a latch bar 65 and reset bar 66.

It is, of course, to be appreciated that there are two levers 58, one at each side of the machine and that there are likewise two supporting bell crank levers 60; but on the gear side of the machine, the lever 60 does not carry a stub shaft 63. Instead, it provides a spring abutment 61 against which the pressure of a spring 68 is applied. The spring 58 thus tends to rock the cross shaft 6! in the direction urging the stub shaft 63 against the latch bar 65. Consequently, if the latch bar 65 is moved out of engagement with the stub shaft 63 the cross shaft 6| rocks and the support for the levers 58 moves down a distance sufficient to disengage the varnish roll 6 from the impression or varnish cylinder.

The extent to which the cross shaft 6| rocks upon withdrawal of the latch bar 65 is defined by an adjustable stop 69 on each side of the machine.

The latch bar 65 has a fixed pivotal support it and is connected by means of a link H to a lever 12 fixed to the shaft 24. Thus, when the shaft 25 rocks in response to release of the latch 22 the latch bar 65 is lifted out of engagement with the stub shaft 63 with the result that the varnish roll is retracted concomitantly with the swinging of the'cams I8 and I9 to their inoperative positions.

Restoration of the varnish roll to its operative position and reengagement of the latch bar 65 with the stub shaft 83 is effected by reciprocation of the reset bar 66. The free end of this bar is supported on a roller 13 to be at all times in line with the stub shaft 53, and its opposite end is connected as at M to a medially pivoted lever '15 which carries a cam follower 16 to track on a reset cam H. The reset cam 11, which like the other reset cams is mounted on the shaft I4 of the feed cylinder, is timed to operatively actuate the reset bar when the opening in the impression or varnish cylinder in which the grippers are located is opposite the varnish roll.

Consequently, the momentary positive lifting of the varnish roll once each cycle the machine runs without a sheet on the impression or varnish cylinder will have no objectionable effect as the varnish roll will not contact the naked cylinder. To enable the latch, which consists of the bar 65' and the stub shaft 63, to be accurately set, a set screw 78 is carried by the outer free end of the latch bar in position to have the head thereof engage against the stub shaft. The varnish applicator assembly in itself embodies several important features. At the outset it is seen that this entire assembly is arranged to be moved or slid to and from its operative position which in itself is highly advantageous due to the accessibility it affords.

For this purpose the applicator'assembly is slidably supported on tracks 19 fixed to and projecting from the side frames I3 of the machine. These tracks, which are U-shaped in cross section, provide slideways for supporting rails 80 on the outer ends of which the side frames 8! of the applicator assembly are secured.

Movement of the applicator assembly to and from 'its operative position is effected by rocking a shaft 82 by means of a crank 83 fixed to one end of the shaft. Also fixed on the crank shaft are two crank arms 84 the free ends of which are connected by links 85 to the side frames 8| of the applicator assembly. Thus, by swinging the crank'83 the assembly is. quickly moved to zandif'rom itsaoperative position, and when moved out to its inoperative position'shownin'Figure 8, an'electric drive motor 86 convenientlymounted -on"one of the side'frames of the machine is-auto- 'matically .drivinglyconnected with the applicator assembly through the tensioningof a'beltfi'l.

Thus,:whentheapplicator assembly is racked back" the liquid varnish may-be kept agitated without necessitating the :running of the entire rmachine.

aThe'fountain or;pot"88 whichcontains the .liquid. varnish is mounted-between the sideframes -8I- to which it is rigidly secured, and extending across-the top'thereof with its axis fixedwithre lation thereto is a metal jgauge roll 89. The ends of the shaft which mounts thegauge roll project-beyond the side frames, and on thegear side of the machine, shown in Figure'B, this shaft :carries -a pulley 98 over which the belt .81 is trained and adrivegear 91 which meshes with a drive pinion 92 when the applicator assembly ;is,in its operative position shown in light broken ;lines,in:Figure 8.

jThe drive pinion 92 is so mounted as to accommoda-te. .possible improper meshing with thegear 29 I and to automatically bring these gears into propen-meslrasthe machine begins to operate.

g'Ihe -endrportions of the gauge roll shaft pro- ..vide the'flxedwsupports for the levers 58 and also have supporting arms 93 pivotally mounted thereshaft-ends 9Q provides an adjustment for ac- -curately settingthe pressure with which the rublbervroll fi engages the gauge roll 89,.and thereby :determines the'thickness of the varnish film applied to :the .work. Adjusting screws 93 provide -rneans for-turning the eccentric bushings, as will be readily apparent.

:When the varnish roll ii isin its operative positionrcontactingether gauge roll and capable of applying-varnish to thesheets carried by the -.-impression'or -varnish cylinder, the outer ends tof-:ther.-leve1' -arrns 95, which carry the varnish ;ro11,.are-suppcrted son rests 99 fixed'to the supporting arms r93. The varnish roll is thusarranged to swing about-the axis of the gauge roll .anditsposition of elevation with relation to the iimpression cylinderis dependent upon the .positionof :the supporting arms 93.

.These arms 93 -in'-turn are adjustably sup- ,ported on thevlevers 53,'the adjustment being eifected by SCI'GWSJ'ififi carried by the levers 58 :and :engagingiportions of the supporting arms $3. .Throughathis latteradjustment the operadiiveposition of theivarnish roll 6 with'respect to -the varnish cylinder :5 is properly set.

Whenthe-iatchbar65 is disengaged from the stubrshaft 6i3,;.all0wing .the'bell crank lever Bil to swing in .a counterclockwise direction, the

"leverage system Supportingthe varnish roll 5 is allowed to drop down to .the position shown in =Figure 4, in which the varnish roll is spaced from theimpression cylinder and the printing couple is open.

.Theavarnish roll is positively driven to revolve .zill thewsame: direction as the varnish cylinder, v but ata speedslightly'difierent from that of the 8 Varnish cylinder to effect a wiping action by means-.of-a sprocket chain lfll trained about a sprocket H 2 fixed to the varnish :roll shaft, .a sprocketon the shaft of the gauge -roll, :which i the driven roll, and an. idler sprocket I03.

-When-the entirevarnish applicator assembly .isracked back'ormoved' to its inoperative position-shown in Figure 8, the varnish roll- 6 .may be swung-up into plain view as clearlysshown in Figure 7. This not only exposes-theentire varnish fountainto view so thatit can bereadily tcleaned outif necessary, but so holds .the bearings-J5 "of. the varnish-roll that the roll can be easilyremoved. The position shownin Figure 7 to which 'thevarnish roll is swung is defined by a--stop link ifi l.

In-the varnishingof printed sheets-itis necessary to provide -means for leaving parts .of -the sheets unvarnished, that is, dry strips must be -left atintervals along the width of sthe sheets. For this purposewipers 105 are provided. .These wipers wipe the varnish off the rubber varnish 'roll so that in the finished work an unvarnished strip will appear in line with each such wiper.

Inasmuch as the location of the unvarnished or dry strips is dependent upon the nature of the work, the wipers are .adjustablelengthwise :of the varnish roll and to this-end theyare all mounted on a bar or track- H36 fixed totheundersurface-of the fountain and extending .for the length thereof.

Each wiper has a-mounting bracket l0! slidable along the length.of:the bar .or.track and adapted-to be securedinanyposition alongthe length thereof by a set screw J98.

Medially pivoted to the bracketv is a leverarm iE-dthe upper end of which has thewiper arm per se pivoted thereto and. the lower end of which is arranged to abut against-an adjustable stop llll.

A toggle Ill yieldingly urges .the wiper down to its operative position defined by the engagement of theundersurface thereof with theadjacenttop edge of the fountain, orholds the wiper ,inan upwardly swung position shown in Figure 7. With the wiper'in its operative position, adjustment of the screw 1 ldmoves the-same toward sand-from the rubber varnish roll, as will be readily apparent.

Itisto be observed that this manner of mounting thewipers and particularly the toggle ar rangement, permits the wipers to be automatically swung to inoperative positions as the rubber varnish roll is lifted, and that when swung to such positions the-toggles hold the same elevated so that the varnish roll-can be returned toits l operativeposition without interferencefrom the wipers.

If,after the varnishrollis returnedto its operative position, the wipers are not individually restoredto' theirpositions engaging the roll, the return of-the varnish applicator assembly to its operative position automatically brings the wipers back into engagement with the varnish roll. This is :accomplished by-a guard I I2 carriedby the fixed part of the machine and provided with an overhangingarm which engages the raised Wipers as'the applicator assembly is .moved into its operative position.

From the foregoing description, taken inconnection'with theaccompanying drawings, it will be readily apparent tothose skilled in the-art that this invention'provides meansoperable withoutstopping the .pressfor opening'the printing coupled. e. retracting the varnishapplicator roll from the varnish cylinder upon presentation of that this invention also provides a simple manner of keeping the varnish in the fountain of a varnisher agitated when the machine is idle and without necessitating running the entire machine and that the entire varnish applicator assembly may be moved to a position making all parts thereof readily accessible.

What we claim as our invention is: s

1. In a varnisher having a main frame and a varnish cylinder: a varnish applicator assembly including a varnish roll cooperable with the varnish cylinder; means on the main frame mounting the applicator assembly for movement to and from its operative position at which the varnish roll coacts with the varnish cylinder; a main drive for the machine having means connectible with the applicator assembly to drive the same when said assembly is in its operative position; an auxiliary drive motor mounted to be the belt is taut.

2. In a varnisher having a main frame and a varnish cylinder mounted thereon: substantially horizontal slideways carried by the main frame; an applicator assembly including a'varnish roll cooperable with the varnish cylinder in the operative position of the applicator assembly; means mounting the applicator assembly on said slideways for movement to and from its operative position; a main drive for the machine having power take-off means connectible with the applicator assembly to drive the same when said assembly is in its operative position; a driven pulley on the applicator assembly; an auxiliary drive pulley on the main frame of the machine so positioned that the distance between said pulleys is less when the applicator assembly is in its operative position than when it is in its inoperative position; and a transmission belt connecting the drive pulley with the driven pulley and-adapted to be automatically tightened upon moving the applicator to its inoperative position so that the applicator may be run from the drive pulley when in its inoperative position.

3. In a varnisher having a main frame and a varnish cylinder mounted thereon: substantially horizontal slideways carried by the main frame; an applicator assembly including a varnish roll cooperable with the varnish cylinder in the operative position of the applicator assembly; means mounting the applicator assembly on said slideways for movement between an operative position at which its varnish roll is in operative relation with the varnish cylinder and an inoperative position at which the varnish roll is spaced from the varnish cylinder; a main drive for the machine; disconnectible means for driving the applicator assembly from the main drive of the machine when the applicator assembly is in its operative position; a\ pulley on the applicator assembly drivingly connected with the varnish roll; an auxiliary drive motor on the main frame of the machine for driving the applicator assem 10 bly in its inoperative position and so positioned that the distance between the drive motor and said pulley is less when the applicator assembly is in its operative position than when it is'in its inoperative position; and a transmission belt connecting the drive motor with said pulley and 7' adapted to be automatically tightened upon moving the applicator to its inoperative position to thereby drivingly connect the applicator with the auxiliary drive motor. i

4. In a varnisher, a varnish applicator assembly comprising: a varnish fountain; a varnish applicator roll; pivoted lever arms mounting the varnish applicator roll for movement from an operative position having a portion thereof disposed within the fountain to an inoperative position lifted entirely out of the fountain; a gauge roll revolvable on a fixed axis and cooperable with the applicator roll; and adjustable pivots for the lever arms; said pivots having adjustable means for varying the position of the axis of pivotal movement of said lever arms whereby the position of the varnish applicator roll may be adjusted to thus adjust the pressure with whichthe same is engaged by the gauge roll. 1

5. In a varnisher having a varnish cylinder, a varnish applicator assembly comprising: an open topped fountain; a varnish applicator roll for transferring varnish from the fountain to work carried on the varnish cylinder; means for detecting a faulty sheet presented to the machine, and means mounting said varnish applicator roll for rotation and for bodily movement away from the varnish cylinder to preclude the application of varnish thereto when the cylinlderis naked comprising a pair of supporting lever arms pivoted to swing about a fixed axis spaced from the axis of rotation of the varnish applicator roll, a movable support for said lever arms, and means including latch mechanism actuated by said detector means for releasably retaining said movable support in its operative position.

6. In a printing machine having cooperating rotary elements constituting a printing couple:

supporting means mounting one of said rotary elements for rotation and for bodily movement toward and from the other rotary element, said supporting means being biased to hold its rotary element away from the other element; means including latch means releasably'holding said supporting means in a position in which the rotary elements are in cooperative work performing juxtaposition; detector means for detecting a faulty or misaligned sheet presented to 'the machine; means connecting said detector means with said latch means and operable to trip the latch means .in consequence to detection of a faulty or misaligned sheet by the detector means to thereby permit said supporting means to carry said one rotary element away from the other rotary element in response to said bias; and means for cyclically moving said supporting means back to operative positionagainst said bias after it has been so released and for resetting the latch means.

7. In a varnisher having a varnish cylinder and .a varnish applicator roll: a pair of arms rotatably supporting the varnish applicator roll, said arms being pivoted on an axis spaced from the axis of the varnish cylinder and parallel thereto; means including latchmeans releasably holding said arms in an operative position in which the applicator roll is held in juxtaposition to the varnish cylinder; detector means for detecting a faulty or misaligned sheet presented to the mac n e n n ct n id d t ctor mean with said latch meanswhereby the latch means is tripped in consequence to detection of a faulty or' misaligned sheet by said detector means to thereby'release said pair of arms to permit them to-carry the varnish applicator roll away from the varnishcylinder; and means for cyclically moving said supporting arms back to operative position and resetting the latch means.

8-. In a machine of'thetype having a printing couple comprising cooperating rotary elements one of which is an impression cylinder having a gripper pocket'and grippers operating therein to hold a sheet totheimpression cylinder; means forfeeding sheets to the impression cylinder; detector" means for detecting defective sheets as they are presented to-the machine; means under the-control of'said detector means for eiiecting openingof the printing couple upon the presentation-ofa-defective sheet to said detector means; and-means including a cyclically operable motion producing member driven in timed relation with theimpressi'on cylinder for reclosing the printing couple when the other rotary-element is opposite thegripper pocket in the impression'cylinder so that if the next successive sheet presented to the machine is also defective momentary reclosure of the printing couple will not result in contacting engagement between the rotary elements at a time" when the impression cylinder is running naked:

' 9; Ina varnisher h'aving-a frame and a varnish cylinder-mountedin-the frame: a varnish applicator assembly including afountain and an applicator: roll;- means-mounting theapplicator assembly' f'o'r 'movement" with respect to the frame to an operative position in which the applicator roll-coactswith the varnish cylinder and is immersed in varnish contained within the fountain, or to" an inoperative position-in which the applicator-roll-is removed from the varnish cylinder and is adapted tobelifted to an elevated position entirely'out of the fountain; a wiper for wiping varnish from the applicator roll; means mounting said wiper including a spring toggle adapted-to hold the Wiper in its wiping position coacting with the varnish applicator roll or in a position entirely clear of the roll permitting the roll'tobe lifted to its elevated position; and a part on the frame in a position to engage the Wiperand push it to its wiping position in the event the applicator assembly is returned to its operative position while the wiper is in its inoperative position.

10: In aprinting'machinethe combination of a printing couple comprising complementary rotary elementsbiased apart; a latch normally holding said elementstogether; meansfor feedingsh'eetS to" the couple; detector means for detecting defective sheetsas' they are presented tothe machine; means under the control of said detector means for-tripping said-latch to thereby efiect openi'ng of the printing couple upon the presentation of' a defective sheet to said detector means; and cyclically operable means for effecting recl'csureof the printing couple and resetting of the latch in the event the printing couple has been opened whereby the opening and reclosing of the printing couple takes place without stopping the machine.

11. A machine of the type having a printing couple comprising complementary rotary elements biased apart and latch held together, detecting'means for detecting a defective sheet presentedto themachine; and means responsive to-the functioning of said detecting means for rotaryelements to separate upon the presentation of a defective sheet'to the machine, characterized by: cyclically operablemeans for automatically bringing said rotary elements together and for resetting of the latchafter each separation of'said rotary elements whereby the opening and reclosing of the printing couple takes placeautomatically-without stopping the machine.

12. In a machine of the character described: a printing couple comprising complementary rotary elements biased together, one of said elements being an impression-cylinder having a gripper pocket and grippers in said pocket to hold a sheet to the impression cylinder; a latch-normally holding saidelements together; means for'feeding sheets to the printing couple; detector means for detecting defective sheets as they are presented to the machine; latch actuating mechanism under the control of said detector means for tripping the latch to thereby effect opening of the printing ccupleupon the presentation of a defective sheet to' said detector means; and cyclically operable means for automatically'reclosing the printing couple and resetting the latch; said. cyclically operable means being so timed with rotation of the impression cylinder thatreclosure ofthe printing couple occurs when the other element of the printing'couple'is'opposite the gripper pocket in theimpression cylinder so that if the next successive sheet presented to the machine is also defective the momentary reclosureof the printing couple will not efiect contacting engagement between the elements thereof.

IShInamachine of; the character (described: cooperating rotary, elements providing a normally closed, printing couple oneof said-elements being bodily movable. with respect, to the. other and biased toaposition inwhichthe, printing couple iscopen latchmeans holding. said element. inthe closed position; detector means/responsive tow the presentation. of a. defective. or misaligned sheet to-the-machine; latch actuating means operable by the detector means upon the presentation of a defective. ormisalignedsheet to. the machine for tripping said latchmeans: to thereby effect openingof thecouple; and means. including a cam rotating in timed relation with one of said elements of the printing couple'- for; cyclically moving said bodily movable printing couple element' back; to the closed position after the printingcouple has-been opened and for resetting; the latch means.

14-. In avvarnisherra varnish applicator assembly comprising: a varnish fountain; a varnish applicator roll adapted to dip into varnish within. the varnish fountainwhen. in. operative position'; a gaugeroll revolvableon a,fixed:.axis.and cooperable with the applicator roll; lever arms mounting the varnish applicator roll for. movement from an operative position riding on the gauge roll. to an, inoperative.positi'onspacedtherefrom; and adjustable pivots for the lever arms including eccentric bushings mounted" in: said lever arms whereby the positionof the varnish applicator roll may be adjusted to thus vary the pressure with which the same engages the gauge roll and thereby regulate the thickness of the varnish being applied by the applicator.

ELMER W; BELLUCHE. FRANK R.v BELLUCHE.

(References on followingpage) 13 REFERENCES CITED Number The following references are of record in the f h 1 t t: 1 1

file o t 1s pa en v 1 1 UNITED STATES PATENTS 5 2,102,984

Number Name Date 2,133,933 205,367 Dooley June 25, 1878 2,290,200 533,443 De Jonge Feb. 5, 1895 2,424,732

14 Name Date Prouty Mar. 17, 1908 Weightman et a1. Nov. 28, 1922 Federivitz Apr. 20, 1937 Von Hofe Dec.-21, 1937 Daley Oct. 18, 1938 Murch et a1 July 21, 1942 Belluche et a1 July 29, 1947

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