US1315382A - Tripping mechanism fob - Google Patents

Description

APPLICATION FILED NOV- 30, I9".

Patented Sept. 9, 1919.

mom/us U TE STAES orro.

ROBERT MIEHLE, OF CHICAGO, ILLINOIS.

TRIPPING MECHANISM FOB'PRINTING-PRESSES.

Specification of Letters Patent.

Application filed November 30, 1917. Serial Nb. 204,720.

To all whom it may concern:

Be it known that 1, ROBERT MIEI-ILE, a

citizen of the United States, residing at ing so that the sheet may be brought into impression relation with the printing element of the machine.

Another object resides in providing a construction, arrangement, and combination of elements whereby the sheet imparts suffioient motion to a movable element and im parts .suflicient force thereto to enable the movable element to actuate the devices hereinafter described or any devices as may be desired without requiring a delicate construction and adjustment of parts, and whereby the possibility ,of the sheet being torn or ruptured is very remote, and preferably whereby the sheet is held firmly against movement caused by the action of the movable element thereagainst. This last mentioned feature is of considerable importance as I contemplate using the invention to control the tripping mechanism of the second printing couple of a two color fiat bed printing press and engaging the sheet to control thesame after the first printing operation has been effected as the proper time for actuatingthe trip control mechanism of the second couple occurs as the sheet is being transferred from the first couple to the secondcouple.

A- further object resides in providing means for controlling the tripv control mechanism, which is independent of the above noted sheet operated means, this independent means being adapted to control said trip control mechanism to effect'the tripping of the printing couple and to render the same ineffective to trip independently of the sheet operated mijeai'u's'. I

With these and other objects in View which will be hereinafter described and particularly pointed out in the claims, the invention consists in the mechanism illustrated in the accompanying drawings, forming a part of this specification, in which:

Figure 1 is a partial side elevation of a two couple printing machine embodying my invention, the machine illustrated being a two-color machine, or-one which is adapted toprint twice upon the same side of the sheet.

Fig. 2 is a partial side elevationrof the machine taken on the opposite side of the machine. f

Fig. 3 is a partial sectional view in rear elevation upon the line 3 3 of Fig. 1.

Fig. tis a view s milar to Fig. 1 showing the parts in a different position inthe cycle of operation. I I

Fig. 5 is a side elevation in partial section of a portion of the mechanism showing the same in another position.

Fig. 6 is a partial side elevation of another portion of the mechanism showing the same in the same relative position as Fig. 5.

Fig. 7 is a plan view of a portion of the 7 mechanism on the line 6 6 of Fig. 4.

Fig. 8 is a sectional elevation of a portion of the mechanism on the line 8 8 of Fig. 4. Like characters of reference indicate like 'partsin the various views.

In the drawings 1 deslgnates the frame of the machine in which isjournaled the first impression cylinder 2,,the transfer cylinder 3, and the second. impression cylinder 4:. The impression cylinder 2 rotates in a counter clockwise direction, the transfer cylinder El-rotates in a clockwise direction, the impression: cylinder t rotates in a counter clockwise direction. The bed 5, which carries aform 6 for the first impression cylinder 2 and a form 7 for the second impression cylinder 4: is reciprocated in unison with the cylinders as is the usual practice. The cylinder 2 is provided with grippers 8 which Patented Sept. 9, 1919.

are adaptedto take a sheet from a feed board 9, bring the same inimpression relation with'the-form 6, andthento transfer thesheet to the gripperslO of the transfer cylinder .3-which carries the sheet during nearly one and one-half revolution of its movement. The grippers 11 ofthecylinder 4 which take the sheet and .bring thesame into impression relation with the form 7 after which said grippers release the. sheet onto a deli-very apearatusgnot shown, as is the usual practice. The usual mechanism is employed for opening and closing the grippers, the same being timed so that the grlppers 8 close, upon a sheet, positioned upon the feed board 9, pass the same through the line passing through the axes of the cylinders 2 and 3,-said grippers opening whenthey reach apoint adjacent said line on the next revolution of said impression cylinder 2 to release the sheet, at which point the grippers 10 of thetransfer cylin-- der 3 close upon the sheet and vcarry the same past the line. joining the axes of cyl- V inders '3 and 4. 'The sheet is carried upon the transfer cylinder 3 for nearly one and one half revolution, and when the grippers 10"reach a point adjacent said line joining the; centers of cylinders 3 and t they are opened to release the sheet, at whichpoint the grippers 11 are closed upon the sheet.

' The impression cylinders 2 "and 4 are a daptedfor movement transversely of their axes to move the same into and out of printing relation with. their respective forms thev said cylinders being journaled in boxes 12 which'are slidably mounted in guide-ways 18' of the press frame'l. These boxes 12 are provided with springs 14 which are adapted to move said boxes to position the impression cylinders in their non-impression or tripped positions; The boxes 12 are alsofprovided with eccentric mechanisms 15 of usual construction whereby the impression cylinders may be moved into impression relation with their respectiveforms against the influence of the springs 14, said eccentric mechanisms being provided with actuating arms 16 7 whereby the same may be moved.

rate tripping mechanism is employed for each'of the impression cylinders 2 and 4, and

' V as they are generally similar in construction similar characters of reference will be applied to the corresponding parts of both. A cam shaft, 17 1s journaled in the press frame and is driven from the press-mechanism and 'makes one revolution for each cycle of the adapted to engage the tooth 22 fixedly mounted upon-said rock shaft 18, Arms 23 are mounted upon said rock shaft 18'on 6 either side ofthe machine and are connected machine. A rock shaft 18 is journaled in the press frame and has a cam arm 19 affixed thereto, which is provided with a friction roller which is engaged in the groove of cam 20 mounted upon said came shaft'17.

The cam arm 19 is rotatably mounted upon said rock shaft 18 and carries a hook 21 pivotally mounted at its outer end, which is with their respective actuating arms 16 through connecting links 24, and the essentrlc mechanisms are actuated to move the 1mpression cylinder into and out of impression cam arm 19, hook 21, tooth 22, arms23, and

pivotally mounted upon the cam arm'19 and is adapted to be moved out of engagement) with the tooth 22. A roller 25' is mounted upon a hook 21 near the free end thereof and L travels in the grooveofa'cam lever'26 which is fixedly mounted o upon a rock shaft 27 j ourna-led in the press frame. The upwardly facing surface of the cam groove of the cam lever 26 is provided with a raised portion 28,

which lies below the roller '25 whenithe' roller j of the cam arm 19 is passing through the are 7 a b of the cam 20, the mechanism being so arranged that'when said rol-ler of the cam arm 19is passing through said are a' b the impression cylinder is in its upper or tripped position. If the cam lever 26 is raised, while the parts are in this position, the raised portion 28 engages the roller '25 to lift'the hook 21 out ofengagementwiththe tooth 22, thus disconnecting the cam arn1"19' from the ec V centric mechanisms .15 whereby the cylinder, 7 7

remains in its upper orrtlripped posit1o'n during the ucceeding revoluti'onwof the cam 20.

time that the roller-{cf the cam arm '19 is passing through that portioniof the groove If the cam lever 26 'is released during the of the cam 20'which lies in-the are 6 0,60%

and b a, saidcam lever and the hook 21 are supported by the engagement ofjthe under surface of the hook, which lies between the hook portion thereof and the roller of the .cam arm 19, with the crown of the tooth 22, the tooth receiving portion'of said hook hav-.

lng passed out of engaging relation with sai'd tooth during the initial movement of the rollerof cam arm 19 through the are 72' c. If said cam'lever 26 is released during said period the'hook reengages the tooth as said roller ofthe cam arm 19 passes through the are a I) of the cam 20 after havingpassed through said are d a, whereupon the normal position of the parts is again resumed. "It will be noted that whilethe roller of the cam arm 19 is passing through the arc Z7 d the cylinder is in impression relation with its form,'

The mechanism just described is duplicated in the tripping mechanism for each i impression cylinder, or printing couple, the only dlfference in construction between the tripping mechanism of each couple lying in the means for controlling'the same, orin the means for positioning the cam lever 26 to control the position of the hook 21*relative to the tooth 22. The rock shaft 27 of the first couple," which includes the impression cylinder 2, has an arm '29 fixedly-l mounted'there011;"The free end" of this aim is connected to the foot treadle of usual construction, not shown whereby the cam lever 26 of said first couple may be manually positioned to trip the-impression cylinder 2.

Inasmuch as the means for tripping the first couple. or the impression cylinder 2,

does not enter intothis invention, it needs no further description. The rock shaft 27 of the second couple has an arm 30 fixedly mounted thereon. and which by reason of this fixed connection with said rock shaft is adapted to control the position of the cam engagement of the bottom of the hooked portion of the hook 21 with-the crown of the tooth 22. The upwardmovement of the arm '30 is'also limited by this engagement. A cam 32 is mounted upon the camshaft 17 of the first couple and it is engaged by a roller journal'edupon the free end of a lever 34. V

which is pivoted upon therock shaft 27 of the second couple. A tension spring 35 has its opposite ends connected-to said lever 34 and the press frame 1 and maintains said roller 33 in engagement with the cam 32. A coupler 36 is pivoted at the'free end of the arm 30 and has an upwardly facing surface formed at the free end thereof which is adapted to engage a downwardlv facin surface 37 formed on an extension 38 0f the lever 34, when the arm 30 is in its upper position, and the lever 34 is in its upper position with the roller 33 thereof in engage- .ient with the low portion of the cam 32. Mounted upon extension arms of the press frame 1 is a stationary rod39 which extends across the machine andis disposed adjacent the transfer cylinder 3 just above the point where the periphery of the cylin der 3 and the cylinder 4 nearly meet. The

rod 39 carries bearing brackets 40 mounted thereon at intervals throughout its length, and the rock-shaft 41 is journaled in said. bearing brackets and the extension arms of the press frame-which support said stationary rod39. An arm 42 is mounted upon the .end of the rock shaft 41 which lies directlvabovethe coupler 36, andthe upper end of a connecting rod 43 is pivotally mounted at the free end thereof. The coupler 36 has a horizontally extending arm 44 formed thereonyand the lower end of tiie connecti'ngrod 43 is pivotally mounted at the free end thereof. l

' As is usual circumferential spacing members 45 are formed upon thesurfacfe of the transfer cylinder 3 atinter als along? the length of the same. These are'formed with outwardly projecting teeth for engagement with the sheet so that the printed matter on the sheet, which it will be noted is on that side of the sheet facing the surface of the cylinder 3, is not marred. Gripper stops 46 are-disposed Within a recess of the cylinder 3, and the grippers 1.0 are adapted to clamp the leading edge of the sheet upon said gripper stops. The engaging surface of said gripper stops is disposed in the same plane as the sheet engaging surface of the spacing members, and the leading ends-of said spacing members are disposed in line with said gripper stops whereby the leadingedge of the sheet is supported and held in a very rigid manner. Mounted upon the rock shaft 4-1 isanarm 47 which has abroad engaging blade 48. formed at the free end .thereof. The arm 47 is so disposed that when it is in itslower position the blade 48 thereof projects into the space between the sheet,sup-

ported as herein before described. 'andthe periphery of the cylinder and projects across the path of the sheet. The main 'por tion of this 'blade'is disposed between a pair of gripper stops and the ends thereof extend beyond said gripper stopsto engage the sheet on theother side thereof beyond the space members adjacent the gripper stops, and has slots 49 formed in'the trans verse edge thereof and so disposed that the spacing members, grippers, and gripper stops-46 in line with said blade pass through said slots when the blade is in its lower position. The slots 49 which are disposed in line with the grippers are cut deeper so that the gripping portions of the grippers which project above. the surface of a held sheet may pass said blade in all positions of said blade and grippers without interference.

The above described parts are so arranged that when the couple member 36 is positioned so that the upwardly facing surface thereof is in line with th wnwardly facing surface 37 0f the extension 38 the arm 42 is in its lower position, and when said couple member is position m that the upwardlv facing surface thereof is out of line with said downwardl facing surface of the extension 38 said arm 42 is in its upper positi on. When the arm 42 is in its lower nosition th blade 48 projects in'to the space between the sheet ,and the c linder and across the path thereof, and when said arm is in its upper position the transverse edge of the blade is positioned to pass overthe outer surface of the sheet supported upon said cylinder 3. The pivotal connection be-.

tween the arm 44. and the connecting rod shaft 27 of the tripping'mechanism of the second couple, so that as the cam 32 moves the mechanism as will be hereinafter described,-the rock shaft 41 is not disturbed;

Asbefore stated the cam lever 26 is oper V able onlyto position the trippingv mechanism when the roller ofthe cam arm 19 is passing through'the area b, and the cam 32 is so timed, relative to the cam 20 of the second couple, that the high portion thereof will engage the roller 33 of the. lever34 asthe roller. of the cam' arm 19 1s passing through F said arcie Inth'e operation of the device the upwardly facing "surface of the couple member 36 normally underlies the downwardly facing" surface37 to maintain an operable connection between the lever 34; and the arm 30. In this position the blade 4C8 projects z'across the path of a sheet carried by the tr-ansverse cylinder 3, see Figs; 4, 5, and *6.

As the press is operated the roller 33 is en- ,gaged by the high portion ofthe. cam 32 to move the same downwardlyduring each cycle. This movement istransmitted to the couple member 36 and the arm 30 to the cam lever 26, which israised to engage the raised portion 28 thereof with the roller 25. As

before stated this movement occurs atthe time when the roller of the cam arm 19 is passing through the area b of the cam20,

' tendency so that undue strain will not be put upon the sheet as it engages the blade 48' to move said couplemember '36 out of en gagementgw'ith'said extension 38.

The upwardly facing surface of the couple member 36 is disposed relative to the downwardly facing surface 37 of the extension 38that when the roller 33 of the lever 34 is engaged with the low portion ofthe cam 32', clearance is left between said opposing surfaces so that said couple member may be easily operated. Y J p When a sheet is transferred from the 1mpression cylinder 2 to the impression cylln- 'der 4 by'said transfer cylinder 3 the same:

engages said blade/18 to move said couple 'member out of engagementwith the 'exten sion38 as before described, and the blade 48 is so positioned that theleading edge of the sheet will engage the same to move the couple member 36 just previous to the'time' when the roller33 of the lever isengaged f by the active partof the am 32 tomove trip the couple as before described;

the same downwardly. This operatesto pre- 66 vent the cam 32 from positioning the cam lever 26 of the second couple to position the trippm'g mechanism to trip, the second couple. Figs. 5 and 6. show the mechanismiin 'position to trip atitheipoint where, if a sheet were passing through the machine, the couple members 36: would be moved to prevent'the'cam 32 from positioning the trip ping mechanism to trip that couple Fig...

1 shows the roller 33 in engagement with tion-ing the tripping mechanism to trip that couple. Fig. 1 also. shows; the roller 33 in engagement; with the high portion of the cam 32'with the couple'member moved out of engagement with said extension 38 by a sheet 51 supported on said transfer cylin ,t-he highportio'n ofthe cam 32'fr0mposi:

so a

be noted "that I have pro-i; if 7' videdvmeans for controlling the tripping mechanism by the passage of a sheet through the; machine, thexnature' and construction i being such that enough movement is imparted to the mechanism toproperly operate the same without injury to the sheet;

'Inaddit'ionto the above described'mechanism I provide means for independently controlling the trip positioning means whereby the tripping mechanism "may be controlled to trip the cylinder-or to maintain the same printing relationwith its form regardless of whether or not a sheet'is passing through the. machine. This mechanism consists in'the following. Pivoted upon the free end of the arm 30, and pref erably coaxial with the couple member 36, is'a second coupler element 52 which has a hook formation adapted to underlie the ex tension 38. An operating arm 53 isformed upon said coupler element 52'and has a slide rod 54 pivotally connected to the free end 7 thereof. 7 The slide rod 54Vhas an venlarged end portion formed with a longitudinal slot 55 which is engaged by stud 56 mounted on.

thepress frame=1,and an operating handle 57 is formed upon'the extending end'of'said enlarged portion. The-slot155 is formed with three transverseslots58which aredisposed upon the upper side thereof. When the center transverse slot is inengagement with the stud 56 the couplemember 52 is out of onwhen the outer transverse slot is engaged with said stud 'said couple member imden lies said extension 38 so that when the cam 32 operates lever 34 to move the same down V gaging relation'withthe extension 38 andwardly motion will be tran'smitted to said "couple member 52tothe arm 3O and the tripping mechanism will be positioned to A stud 59 is formed" upon an extension member 1 of the couple member 52 and is adapted enga ge the couple member 36 to i l move the same out of engaging relation with the precise thereby.

the path of the sheet between stops and adapted to be engaged by the lead the extension 38 when the inner transverse slot is engaged with the stud 56.

NVhile I have herein shown and particularly described the preferred embodiment of my invention I do not wish to be limited to details of construction shown as changes may readily be made without departing from the spirit of my invention but having thus described my invention I c aim and desire to secureby Letters Patent the following:

1. Ina printing press, the combination with a sheet carrying cylinder adapted to receive a sheet and to carry the same, spaced gripper stops on said cylinder adapted to position the leading edge of the sheet in .spaced relation with the periphery of the cylinder, spaced grippers adapted to engage the leading edge of the sheet and to clamp the same on said gripper stops, and a mov able element adapted to project into the space between the leading edge of thesheet, and the periphery of the cylinder and across the gripper ing edge of the sheet to be moved thereby.

2. In a printing press, the combination with a sheet carrying cylinder adapted to receive a sheet and to carry the same, spaced gripper stops on said cylinder adapted to position the leading edge of the sheet in spaced relation with the periphery of the cylinder, spaced grippers adapted to engage the leading edge of the sheet and to clamp the sameon said gripper stops, and a movable element extending across said grippers and gripper stops and adapted to project into the space between the leading edge of the sheet and the periphery of the cylinder and across the path of the sheet and having I slots formed at the projecting portion thereof in registry with the several grippers and gripper stops and'adapted to be engaged'by the leading edge of the sheet to be moved 3. In a printing press the combination with a sheet carrying cylinder adapted to receive a sheet and to carry the same, spaced gripper stops on said cylinder adapted to position the leading edge of the sheet in spaced relation with the periphery of the cylinder, spaced grippers adapted to engage the leading edge of the sheet and to clamp the same on said gripper stops, circumferential spacing members disposed at intervals along the length 01": the cylinder adapted to hold the sheet in spaced relation with the periphery of said cylinder, and a movable element'adapted to project into the space between thesheet and the periphery of the cyl; inder and across the path of the sheet between several gripper stops and several spacing members and adapted to be engaged by the sheet to be moved thereby.

a. In a printing press, the combination with a sheet carrying cylinder adapted to receive a sheet and to carry the same, circumi erential spacing members disposed at intervals along the length of said cylinder adapted to hold the sheet in spaced relation with the periphery'of said cylinder, means for holdingthe sheet onsaid cylinder, andp a movable element extending across said spacing members and adapted to project into the space between the sheet and the periphery of the'cylinder and across the path of the sheet and having slots formed at the projecting portion thereof in registry with the several spacing members and adapted to be engaged by the sheet and to be moved thereby.

I 5. In a printing press, the combination with a sheet carrying cylinder adapted to receive a sheet and to carry the same, circnmferential spacing members disposed at intervals along the length of said cylinder adapted to hold the sheet in spaced relation with the periphery of said cylinder, spaced gripper stopshon said cylinder adapted to position the leading edge of said sheet in spaced relation with theperiphery of said cylinder, spaced grippers adapted to engage the leading edge of the sheet and to clamp the same on said gripper stops, said spacing members supporting the leading edge of the sheet'between said gripper stops, and a movable element extending across said spacing members and adapted to project into the space between the sheet and. the periphery of the cylinder and across the path of the sheet and having slots formed at the projecting portion thereof in registry with the several spacing members and gripper stops between the leading edge of the sheet and.

the periphery of the cylinder and across the path of the sheet between the gripper stops and adapted to be engaged by the leading edge of the'sheet to be moved thereby, tripping mechanism, means having operative connection with said tripping mechanism for controlling the same, and means included in said "last mentioned means and having operative connection with said movable element and adapted to be moved to render said controlling means ineffective to position said tripping mechanism to trip when said movable element is moved by the sheet.

. gripper stops on said cylinder adapted to position. the leading edge of the sheet in spaced relation withfthe-periphery of the cylinder; spaced grippers adapted to engage th'e'leading edge'ofthe sheet and to clamp the same on said gripper stops, a movable elementextendi across said grippers and gripper stops "an adapted to project into 1 the space between the leading edge of the sheet and the periphery of the cylinder'a'nd across the path of the sheet and having slots formedfat the projecting portion thereof in V registry with the several grippers andgrip- 7 per stops. and adapted to be engaged by the thesame on said gripperstops, circumfer-j 7 several spacing'inem bers and gripper stops alongthe length of the-cylinder adapted to hold the? sheet in spaced relation with the a a; s periphery of said cylinder, ai'movable eleleading edge of the sheet to be movedtlierec 4; by, tripping mechanism5 meanswhavingiopv r a 20 erative connection with said tripping mech anism for controlling the same, and means included in said last jmentioned means and having operative connection with said mov able element and adapted tov be moved to render said? controlling means ineffectiveto position said tripping mechanism to trip. I when. said movable element is moved by the sheet. m 8.11 a printing press the combination with" a sheet carrying cylinder adapted to receive asheet and to carrythe same, spaced grippenstops on saidcylinder adapted. to

position-the leading edge of the sheetin I spaced irelation With the periphery ofthe cylinder, spaced grippers adapted to engage the leadingf edge of the sheet-and to clamp entialjsp acing members disposed'at intervals ment adapted to projectinto the space be tween the sheet and the peripheryof the cylinder andlaoross th'e patho'f'tlie sheet be. tween several gripper stops and several spacing members and adapted to be engaged i by the sheet to be moved thereby,,- tripping mechanism; meansfhaving operative connection withSaid tripping mechanism' for controllingthe same, and. meansincliided in Y said last mentionedmeans and having I operative connection withsaid movable element and: adapted to be moved to render 'said'controlling. means ineffective to position'said tripping 'mechanismto trip when said movable element is moved the sheet.

9. Ina printing press, the combination with a sheet carryingcylinder adapted toreceive a sheet and toparry the same, cir-' cnmferential spacing members disposed at" intervals along the length of 'said cylinder.

adapted to hold the sheet inspaced relation with the periphery of said cylinder, means i for holding the sheet on said' cylinder, a

movable element'extending' across said spam 'nism forcontrolling the same, and means in-'' members supporting thejleading' edge ofthe' sheet betw'eensaid gripper'stops 'agmovae ble elementpextendi-ngacrossisaid spacing I members and adapted to project into'the ing members and adapted to project into the 7 space between the sheet and the periphery several spacing members and adaptedto be.

engaged bythe sheet and t0 bemoved thereby tripping mechanism, means having ope r5- atlve' connection with 'saidtripping' mechaeluded in V said last mentioned means and havlng operat ve connection wlth saidlmo'vable el'ementand adapted tobe moved to reinv dersaid controlling means ineffective to 7 p0 sition said"tripping mech'anism to trip when said movable element is moved by the sheet;

1 0. In a' printing press,.th'e'combination position the leading edge. of said sheet in cylinder, spaced grippers adapted to V engage with a sheet carrying cylinder adapted to j receive a sheet and to'ca'rry the same, circumferential spacing members disposed at intervals along the length off'said cylinder adapted to hold'the sheet in spaced relation with" the periphery ofsaid cylinder, spaced V grippers/tops on said cylinder adapted to l ,c spaced relationwithl-the'periphery of'said the leading edge ofthe sheet and to clamp thesame on said gripper'stops, said spacing space between thefsheetgand thei peripliery of the cylinder'and' across the path of the sheet and having slots 7 formed at the fp'ro-Q jecting portion thereofin registry with the and adapted 'tobe engaged'by the leading edge of the sheet to'belmoved therebyQtrip- P m;- i ean's ha ing operative ;i connection withsaidtrlpplng mech l Sm f0? controlling the same, and means included ind ,sald 'l'as't'mentioned means and having oper ative connection with said movable element and adapted to be'movedto'trip to'render V 7 said controlling means inefi'ective to posi-cr 4 tion said tripping mechanism'to trip when" said movable'element ismoved by the sheet;

11. In" a printing press, the'combination 'with a sheet carrying cylinder adapted to";

-receivea sheet and to carry the samegcir c nnferential spacing members 'rdisposediat intervalsalongthe length'of said" cylinder adapted to hold thesheet'in spaced rela'-' tion with the periphery of said cylinder; nieans'for holding the sheet on said cylinder "a movable element' extending 'ajcrossf and adapted to be engaged by the sheet and to be moved thereby, tripping mechanism, means having operative connection with said tripping mechanism for controlling the same, a coupler included in said last mentioned means and adapted to be moved to V render said means inoperative to position said tripping mechanism to trip, and connecting means between said movable: element and sad coupler whereby said coupler is moved torender said controlling means inefiective to position said tripping mechanism to trip when said movable element is moved by the sheet.

12. In a printing press,the combination with a sheet carrying cylinder adapted to receive a sheet and to carrythe same, circumferential spacing members disposed at intervals along the length of said cylinder adapted to hold the sheet in spaced relation with the periphery of said cylinder, spaced gripper stops on said cylinder adapted to position the leading edge of said sheet in V spaced relation with the periphery of said cylinder, spaced grippers adapted to engage the leading edge of the sheet and to clamp the same on said gripper stops, said spac nism for controlling the same, and .means.

included in said last mentioned means and having operative connectlon w1th said movable element and adapted to be moved to c render said controlling means inefi'ective to position said tripping mechanism to trip when said movable element is moved by the sheet.

13. In a printing press, the combination with a tripping mechanism, means in operable relation with said tripping mechanism for controlling the same, means in operative connection with said controlling means and engageable with a sheet fed to the press to render said controlling'means ineffective to position said tripping mechanism to trip,

' means independent of said second mentioned means adapted to be moved to render said controlling means effective to trip and means having operable connection with said last mentioned means and adaptedto be engaged with said second mentioned means to render the same inefiective to allow said controlling means to position said tripping mechanism to trip whensaid last mentioned means is positioned in inoperative position.

14; In aprinting press, the combination with a tripping mechanisnn automatic means in operative relation with said tripping mechanism for controlling the same, means in operative connection with said automatic means and engageable with :a-

sheet fed to the press to render said auto- 7 matic means ineffective to position-said trip ping mechanism to trip, means independent of said second mentioned means adapted to be moved to render said controllingmeans effective to trip and means having operable connection with said last mentioned means and adapted to be engaged with said second mentioned means to render the same ineffective to allow sald controlling means to pos1t1on said tripping mechanlsm to trlp when said last mentioned means is in inoperative 7 position. 7

15. In a printing press, the combination with a press driven element, of a second element normally inactive but adapted to be moved, a couple member movably mounted on one of said elements and adapted to be moved to engage the other element to establish an operable connection therebetween, automatic means for controlling said coupler, a second coupler movably mounted on one of said elements and adapted to be moved to engage the'other element to establish an operable connection therebetween, means for pos1t1on1ng said second coupler, and means in operable connectlon with said second mentioned means and adapted to be moved to render said automatic means inoperative to engage said first coupler with said other element when said second coupler is in disengaged position.

16. Ina printing press, the combination .with a movable element adapted to project across the path, of a sheet fed to the press and adapted to be engaged by the sheet and to be moved thereby, of a pivoted arm normally inactive, a couple member pivoted on.

said lever, movable means adapted to be engaged by said couple member to establish operable connection between said arm and said movable means,-an arm on said couple member, and means for positioning said couple member and having a pivotal connec tion with said second mentioned arm, said pivotal connection being disposed to lie substantially coaxial of said pivoted arm when said coupler is positioned to engage said movable means.

l7.'In a printing press, the combination with a movable element adapted to project across the path of a sheet fed to the press and adapted to be engaged by the sheet and to be moved thereby, of a pivoted arm normally inactive, a couple member pivoted on 7 qp a ithi mkn 1m 1 qhta i W said lever; and la; pivoted lever having the same axls as Sibld Lp1v0ted'arm and adapted to beengaged by said couple member 3130 establish oP emble ponnectifim' between said armand SmdplVQted. lever, an arm on sa d said pij t al Corinctibnbging,gliposed tqlie' su bs tan tial ly cgaxial yvitll the axis {of said 10 V piv ted earmpz hen i i coupl r is position to engage sa d pivoted lever. 7 V 7 In ,testimony whereof I affi x myrsign ature hi 27th day 9f N i emb n .A- D- 9 MiE iIQE j

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