US2626563A - Automatic shut-off for printing presses - Google Patents

Description

Jan. 27, 1953 J. F. BANTHIN AUTOMATIC SHUT-OFF FOR PRINTING PRESSES 3 Sheets-Sheet 1 Filed May 25, 1948 INVENTOR. Jamal- EANTHm AT TORNEY Jan. 27, 1953 J. F. BANTHIN 2,626,563

AUTOMATIC SHUT-OFF FOR PRINTING PRESSES n m ffi' I V 2 72 e5 27 I W mm 2a m "I INVENTOR. JDHNF BAI THIN BY AT TORNEY Jan. 27, 1953 J. F. BANTHIN 2,626,563

AUTOMATIC SHUT-OFF FOR PRINTING PRESSES Filed May '25, 1948 a Sheets-Sheet 5 INVENTOR. JIJHNF BANTHIN Patented Jan. 27, 1953 OFFICE AUTOMATIC SHUT-OFF FOR PRINTING rasssss John F'. Banthin, Bridgeport, Conn.

Application May 25, 1948, serial No. 29,013 13 Glaims. (01. 101-278) This invention relates to new and useful immovements in printing presses and ohas-particularrelation to means i-ior instantly bringing to a stop movements of all parts of a press on the opening of the vacuum system including the vacsum "suckers of the transfer or delivery mechanism'of. the press.

object of the invention is to provide a means in a press having a delivery mechanism for delivering sheets or the like from a stack to an impression cylinder and which delivery mechanism includes vacuum suckers, means for infs'tantly stopping the press on the openingof the vacuum system to'atmospheric pressure whereby the press will be stopped should even one of the vacuum Suckers be left exposed as, for example, if the piece'iof paper or other material to be printed upon is not being heldby allof the vacuum "suckers becauseone has released or one has not gripped the paperwhereby the paper may be held in other than the proper manner.

Other objects and advantages of the invention will become apparent from a consideration of the folowing detailed description taken in connection with the accompanying drawings where in a satisfactory embodiment ofthe invention is shown. However, it is to bennderstood that the invention is not limited to the details disclosed but includes allsuch variations and modif cations as fall within the spirit of the invention and the scope of the appended claims.

The present stop mechanism is herein disclosed as applied to a press of thegeneral type disclosed in my prior application "Serial Numbe'r' 745,262 filedMay i, 1947, now PatentNuinber 2,592,998. However, it will be clear that the present invention claims are not specifically limited to the particular construction of press disclosed in said an ication since it is intended that the claims sh" d cover the any tion and all feasible applications on any ecfistructien or press.

In the drawings:

I Fig. 1 is a side elevational view showing a thing ress having the invention incorporated there-mi, v I

V Fig. 2 is a side elevational view on a larger scale showing portions of the press to which the means of theih'Viitidh is directly applied and with which the means of the invention directly operates; I I Fig. 3 15 view on aiarger scale and partly in side elevation and partlyin vertical section show in the details of construction of my present anisin; F g.

1' was 'y 3 .th a e S w in h th a endment the bed or the press "is omitted; and

a Fig. 5 is an isometric view illustrating the relation of said parts when the stop mechanism has been tripped. n p I Referringih detail to the drawings, at til is gen erally indicated a printing press and the same comprises a base or frame I I whichmay be in the form of a single casting and generallyrectangular in plan. Mountedon the frame I I; as by bracket or bearing means I 2, is an impressioncylinder I3 and operable below such impression cylinder in the usual manner is a type bed It adapted to be reciprocated in certain timed relation with vertical movements of the cylinder I3 as is customary in the art. I n M n n At It is shown a support for a stack of paper i6 and a paper feeding means or transfer mechani sm generally designated I1 is designed for removing the sheets one at a time from the stack I6 and delivering such sheets to the impression cylinder I 3. Thi's 'tra'nsier mechanism includes a pivoted arm I8 pivotally mounted as at 19 and designed to be rocked about said pivot in a path to have the transfer mechanism deliver "a sheet from the stack I6 to the impression cylinder and to then have a return movement to pick up the ne'xtsheet from the stack, etc.

For the operation of'tlie transfer mechanism I1, I have shown a crank arm I 8a as an eiitensio'n of the arm I8 and a link I pivoted at its respe'ctive ends to said 'crankai'in and a rocker I Be serves to rock the transfer mechanism through the necessary movement. Rocker we is pivoted intermediate its ends as at 1821 and mounts a roller I86 located in groove I8) in a can I 8g on a shaft I871. also mounting a gear I Biifieshin with a driving gear I8 011 a shaft Ifik. This mechanism is more fully described in my above identified application for patent. v n I Actually there are tWO Of thearm's [8 empmyed and between their upper ends, they mount a manifold 29 from which flexible tubes or'th'e like 2| connect with the vacuum suckers 2,2 commonly employed in the art. From a suitable source iii a suction system, a suction orvacuum isjapplied to the manifold 29 and thence through the tube's 2| to the vacuum suckers 2 2 Thissuction isap plied in certain timed relation wimpperauons of the press, all as is usual in the art; and oils tomarily the suction is on the stickers 22 when they are over the stack as in Fig 1 whereby they pick up the top -sheet oi. the sta Then, in the normal operation of this fl p? of press, the transfer or feeding mechanism is swung forwardly about the pivtts l9 until the suoli fl approach headst'ops 23 when the va'c'iiuifi system is open to atmosphere whereby the suck" rs release the sheet against the head stops whereupon the forward edges of the sheet are engaged by the grippers (not shown) of the impression cylinder. Thereafter, the return movement is applied to the transfer mechanism l1 and the suckers 22 are carried back to their loading position over the stack I6.

Suction to the vacuum suckers 22 originates in a vacuum pump 22a driven as by a motor 222: through pulleys 22c and a belt 22d. From the vacuum pump 22a, a pipe 22e connects with a T-fitting 221 one branch of which mounts a vacuum gage 22g while a tube or pipe 22h from its other branch leads to a control valve device 122i, as fully described in my copending application Serial Number 29,012 filed May 25, 1948. From such control valve device, a tubing 227' connects with an end of the manifold 28 for the application of a suction thereto.

At times the suckers may pick up a sheet of paper in a disarranged or inclined position whereby its forward edge is not straight across, or the suckers may drop the sheet part way to the head stops 23 or the like. Under such circumstances, the improperly placed sheet will probably get out of position in the press and later, particularly if there are several such sheets, they will become jammed about the im pression cylinder and other adjacent parts and likely result in bending or distortion of some parts.

It will be understood in this connection that, prior to the present invention, if the suckers drop the sheet too soon Or in improper alignment, the operation of the press will continue and the suckers of the transfer mechanism will continue to shift sheets from the pile or stack toward the impression cylinder. According to the present invention, means are provided whereby on opening of the vacuum system to atmospheric pressure, the press will be stopped almost instantly. Thus, in a press equipped with the present mechanism, should one of the suckers 22 be exposed, as it will be if a sheet is held at an angle or in improper alignment, the opening of the vacuum system to atmosphere through even one sucker will cause such a drop in the vacuum pressure that the present mechanism will go into operation and bring about substantially instant stopping of the press.

The operator or attendant will, of course, know that something is wrong and he can then remove the improperly placed or disarranged sheet and again start the press into operation. Thus, an accumulation of sheets in positions about the impression cylinder or adjacent parts will be prevented and in this connection it will be understood that when the press is stopped by the present mechanism and then again started, it will continue through the interrupted cycle so that its cycle of operation will be that for which the press was originally set.

On the near side of the press frame ii there is mounted a control box 24, the power leads to which may run through the conduit 25 and from such control box a conduit 26 carries leads to a micro-switch 21, also mounted on such side of the press. Operation of this micro-switch by means to be described results in opening of a main switch or circuit breaker or the like within the control box 24 whereby the power to the press is cut off. The operating button of the micro-switch 21 is designated 28 and is shown as projecting toward the delivery end of the press. This particular location is a, matter of convenience.

The main drive shaft of the press ID is indicated at 29 and on said shaft is any or the usual flywheel 30 and also a drum 3|. Shaft 29 and thus the flywheel 30 and the drum 3] are driven by a belt 30a from any suitable source of power and through a belt 32 passing about a small pulley 33 fast on the shaft 29 other parts of the press may be driven. Since the drive from the shaft 29 to the various parts of the press is old and well-known and conventional structure, it is not deemed necessary to confuse or enlarge the present disclosure by disclosing such means.

About the drum 3| a brake band 34 is located and the same is provided with any friction material 35 designed to be drawn against said drum for the purpose of braking the press. One end of this band 34 is suitably anchored as at 36 to a wall 31 of the frame ll while the other end of the band is anchored as at 38 to an arm 35 of a lever generally designated 40. Intermediate its ends this lever is pivotally mounted at M and then the second arm 42 of the lever is carried upwardly and at its upper end is provided with a laterally extending lug portion 43, the purpose of which will appear. Also, at its upper end the lever may be provided with a projection or extension 44 constituting a hand piece for use in rocking the lever.

A coil spring 45 anchored to the frame wall 37 as at 46 has its other end anchored to a stud 41 rigid with the lever arm 42 toward the upper end of the latter. Clearly, the spring 45 is constantly tending to rock the lever about the pivot 4| in a counterclockwise direction and in a direction to tighten the brake band 34 about the drum 3| to draw the friction pad or lining 35 into tight engagement with said drum whereby to provide a braking action for the whole press.

Pivotally mounted on the wall 31 as by a stud 48 is a trigger device generally designated 49 and in side elevation generally of inverted T-formation. Thus, the trigger 49 comprises a generally vertical arm 50 comprising a stem of the T and a pair of oppositely extending generally horizontal arms 5| and 52 together comprising the head of the T. A short stud or shaft 53 on the trigger arm 52 mounts a roller 54 designed to engage and press inwardly on the operating stem or button 28 of the micro-switch 21 whereby to trip such switch, as will appear.

Trigger arm 5| is laterally thickened and em larged on its inner side toward its free end and is provided with a notch 55 designed'to substantially receive or receive a substantial part of the enlargement, projection or protuberance 43' at the upper end of the lever arm 42 when the trigger 49 is functioning to retain the lever 40 in a brake release position against the tendency of the spring to move said lever to brake applied position. I

Extending outwardly from the near side of the stem of the trigger 49 is a short projection or stud 56 comprising a finger or hand piece for convenient use in manually rocking said trigger for the resetting of the press mechanism, all as will presently appear. On its inner side at its upper end, the trigger arm or stem 50 is laterally enlarged providing a shoulder or surface 51 designed to be engaged by a projection or pin 53 of a trip mechanism generally designated 59, at predeter mined times, as will be set forth.

The trip mechanism 59 is more particularly shown or is better shown in Figs. 3 and 4. There it will be seen that such mechanism includes a bracket 69 secured to the side of the press Was by; bolts lil passing? throu'gh openings; 52 in a thickened oripadalikef portion: 63 ofisaid-tbracketi In; addition to saidtpa-di-likef portion; ,1 the; bracket includesfaaforwardly extending elongated arm; 64' and. an;upsta'ridingrigid lug+likeportion 65: at right angles to the arm 64 and located approxi mately at the juncture: oftsa-id arm and the padlikef'portion" 63 f the: bracket.

Toward: its forward end; thebracket arm: 64" mounts astudv 6.6?- projecting from: thebneansideof said arm and passing. through a: lever 61' im termediateitherendssof lsaidllever but'in eccentric relation: to thet mid? point of; the lever; Thus; the:- stud 66: is. located toward: the: forward: end: of. the lever? 61: so. that' saidzlevertisz overbalanced toward: its rear" end: and its; rear' portion. or? its portiontothe righttofi't'heapivot. 66' (Figs. 3 and i4"): overbalances the: lever portion; toward the? left" of said: pivot and therefore; the. level under the influence: of gfavityconstantly tends to move to and below the positi'on shown in Fig-1- 35 a: clock! wise direction or in a direction to carry its forward orshor'terendportion upwardly;

Extending.laterallyfrom the near side-of the forward. end portion of the lever 61' are a pair of'studsGB and 69' and these studs pass through slots'Hl and 'l'l, respectively, in theelong'ated body portion 12 of ahdb'g' H whichat its forward end is providedwith. an upstanding tooth 14 straight at its inner side whereby to providea shoulder 15. The pin-58 above referred to is. shown sis-extendin'g entirely through the body" of the dog 13 and includes a portion 16 projecting at the inner side of the body. Anchored at one end to this portion" 16 is a relatively heavy coil spring 11 which at its otherend is anchored to a stud T8 projecting from the inner side of the lever 61.

Clearly, with this construction, spring H is constantly tending to close and therefore isconstantly drawing inwardly on the dog- 13 in a manner to bring the body portion 12 of said dog into overlapping relation with the forward end portion of the lever 61. Thus, the spring tends constantly to maintain the dog and the lever such relation that the studs 68 and 69 are always in the-forward end portions of the slots and 'H', respectively; 7

As will later appear, the trip mechanism 59" and-particularly the dog I3 thereof cooperates with a; plate 19 secured to the forward edge of the bed I4 as by bolts or'the like 80 and includes a laterally extending and depending portion having an inner bevelled surface 8-! and an outer straight surface" 82. This construction is" provided sinceit" will be understood that during use: of the press and in each cycle of the pressoperation, the bed. It is moved" through a complete reciprocation. That is, it is moved. firstl in: one: direction" and then in the opposite direction underthe cylinder l3.

As the bed moves toward the feeder endlof the press). thebevelled surface 8| may ride over the bevelled surface of the tooth Mv as thelatter. is in position. to permit of this and then under certain predetermined conditions}, as will. be described, as the bed movesin the oppo'sit'e direction as thedog T3 is inth'e position shown best in Fig. 3;;itsshoulder' White engaged bythe straight surface 8.21 of the means 1e and. the dog; willbe drawnv for}: wardly a predetermined. distance with. the bed: I'll to bring: about movement at the trigger? 49 and release of 'the lever 411.

A wingi -like arm 8 3-visisec1ir'ed. as: by bolts; 84- to; the lug on an: upstanding extension 655 of the bracket 60 andv such wing-servesto" support. a

body:- 8t: This body; is provided: with: a: cylindricalzchamber 8=6vopeni-ng through its lowerend;

and through; a: lateral: orifice; 8:1; communicating; with aa passageway? ea in turn communicating with". a port: or lateral opening; 89" in which is threadedone endiof a tube or pipe ornipple: 90. Such tube or pipe or nipple 90 is through a piece of. flexible tubing, or the like 9 1- incommunication with the; manifold 2B.

Extending through the. lower: op'enrend of; the chamber. 8 6: is a cylindrical plunger '92 :atits lower end providedvwith' ai bifurcatediheadl93tshown1as' straddling the longer endiport-iori otthelever. i1

and; secured to; such lever as-by: a cross. pin 96' passingithroughthe lever and: the arms of: the

head: 93; and passes through an elongated opening 95 in the lever 61 forcertainrelativetmovement. otthese parts; as. will: be made clear; In addition to. the

head 93, the'plunger tz includes acylindric'alporrtiort 96 s1idab1e: in the chamber 36 and open. at itsinner 'end'.

An adjusting screw 91 enterszthe chamber 86 through the upper end of the body" 35 aiid within such chamber engagesa sleeveBB; which'sleeve is of a diameter to telescopically enter-the inner or open upper end of the cylindrical portion 96 of plunger 9 2. Plunger" 9% may bedescribed as" spring l'ciaded since" a coil spring fi is located withinsucli plunger an'd-the inner portion of the sleeve 98 and at one end bears against a part of said sleeve and at its other end'against the head 93' of the plunger; to project the plunger from the chamber- 8 5 and to-resistslight movement of the plunger into" said chamber.

At its upper end; screw 97 is provided with a knurled-head I00 for use-in adjusting the screw and lock nut I 0! is provided f-o'r securing the screw" against casual movement relative tothe body- 85-. This screw is adapted for adjustment to movethe sleeve QbIOIIQililidllitlIY of' the chamber BG-tovary the pressure'of the spring 93 on the-plunger headas;

The bracket arm W is provided. with an op'en ing, [02 and the longer arm of the lever 61? is provided with an opening H13; It will be. clear that throughthe'tube' 9 I the vacuum" system connected with the vacuum suckers 22 is also connected with the chamberiifi" and: when vacuum is applied to this. system and the same is closed to atmosphere; the suctionrresult'ing in the chamber- B6 draws the plunger 92 inwardly of such chamber rocking the lever 61 as to the dotted line position of Fig, 3. In this position, the hole I03; aligns with. the-hole. I132.v

When setting up the press andtiming it,. the lever 81 may be manually rocked; to thispdotted line. position and then a. cotterpiri or; the like, as. suggested, at [04 in Fig. 4; is. passed through the aligned holes; to. maintain the lever. 6.1, and the dog, 131 the operating. position. while. the press is, being; timed and. is manually operated through its normal cycle. When. the press is; in use the cotter pin or the like Ill! is removed from the openings I02 and. H137. That is, this cotter pin is only used' in. seteups. or. adjustments. of the. press to prevent. the, present stopmeans. from.v acting while the press isnbeingi manually moved. throu h 4 its. cycle for testing. adjustments: or, set-up. purposes.

In the operation. of the press; I 0)- the transfer mechanism ll; vacuum, being presentinthe described, system,. when in, position of Fig.- 1

. through suckers 22- takes'. the: topmost, sheet This pin. 91 i'SI- rigid. with the head 93:

Clearly; this coil spring tends 7 from the stack 16. At this time, the impression cylinder 13 is in its upper or off position. Through conventional press mechanism, the transfer means is shifted and delivers this sheet to the head stops 23 to be engaged by the gripper buttons (not shown) of the impression cylinder l3.

At the time of this delivery, the vacuum system is open to atmosphere as by means disclosed in my above identified application breaking the suction on the suckers 22 whereby to release the sheet. As the transfer mechanism returns toward the stack, the cylinder I3 is lowered to on position and the bed 14 carries the type under the cylinder and into engagement with the sheet on the cylinder whereby the sheet is printed. This is all conventional structure.

At thi time, the vacuum system is closed to atmosphere and so there is a suction through the manifold 20 and tube 9| and tube til to the chamber 86 and the plunger 92 is in its inner or upper position and the lever 61 is in the broken line position of Fig. 3 and the dog 13 is also in the broken line position of that figure. Thus, as the bed l4 moves, the member IS will not strike the dog but will merely pass over it.

Now, on failure of the vacuum system as, for example, if one of the vacuum suckers 22 is exposed to the air because a sheet is not properly held or is not sealing such vacuum sucker, the vacuum fails in the chamber 86 and the plunger 92 moves downwardly and the lever 61 drops to the full line position of Fig. 3 carrying the dog 13 to the full line position of that figure. Now, as the bed I 4 continues movement toward the left in Fig. 3, the surface 82 of the member 19 will engage the shoulder 15 of the tooth M of dog 13 and tend to move said dog toward the left.

Such movement of the dog is possible against the resistance of the spring 1'! and results in some eTongation of said spring. However, as the dog is so moved, it moves relative to the lever :3! since the latter is mounted on the stud or pivot 66 and is not capable of longitudinal movement. The slots 10 and H receiving the studs 58 and 59 ermit of longitudinal movement of the dog 13 relative to the lever 61. However, it is noted that the slots 10 and H incline upwardly toward one another so that their inner or adjacent end portions are higher than their outer or remote end portions. Thus, as the dog 13 is moved by the member 19, the dog not only moves outwardly but its front or toothed end portion also must move downwardly. The pins and slots cause a cam-like action.

As the dog so starts to move, the pin or projection 58 of the dog is hearing against the shoulder or surface 51 of the stem 55) of the lever or trigger 49. Thus, this lever or trigger must rock in a counterclockwise direction. As it so rocks, its roller 54 swings upwardly and depresses the micro-switch actuator 28 opening the power circuit of the press by the tripping of a switch or circuit breaker or the like in the control box 24. This cuts off the power of the press.

Additionally, the described movement of the trigger 49 carries the shoulder or notch 55 of the outer end portion of its arm downwardly releasin the lug or lateral extension 43 at the upper end of the arm 42 of lever 45. Immediately such lug 43 is released, the spring 45- rocks the lever 40 in a counterclockwise direction about the pivot 4| tightening the brake band 34 and drawing its frictional lining 35 tight against the drum 3| whereby a braking action is applied to the power shaft 33. 1 At this time, it will be understood that power has been cut off by interruption of the circuit to the primary motor and the application of the brake as described results in the whole press being rapidly brought to a standstill.

When the dog 13 reaches the broken line position of Fig. 3, it will be clear that the member 19 may now pass over the dog so there will be no damage to any part. Further, it will be clear that the pin 58 of the dog need only cause overbalancing of the trigger 49 to carry the notch 55 of the latter downwardly sufficient to release the extension 43 of the lever 40. Immediately this is done, the brake is applied and immediately prior to such operation, the roller 54 has actuated the control element 28 of the micro-switch. Thus, if the vacuum suckers are not all sealed by a sheet being transferred or if they are carrying no sheet, the press is stopped so that investigation may be made as to the trouble.

The transfer mechanism cannot be delivering sheets at an angle or the wrong way so as to clog up the press or cause other trouble. Unless the transfer means is operating properly, the vacuum in the vacuum system fails and the plunger 92 drops resulting in movement of the dog 13 to the full line position of Fig. 3 where such dog will be engaged by the member 19 and the entire trip mechanism 59becomes effective to open the power circuit to the press and to immediately apply the braking mechanism described.

After the operator has remedied any defects, removed any misplaced sheet or the like, he draws the lever ii] to brake release position as by using the handle 45 and actuates the trigger 59 back to set positionwith its recess 55 receiving the lug or extension Q3 of the lever ti? and with the surface 5'! of said lever adjacent the pin 53. In this connection, it will be understood that immediately the press is tripped, the dog 13 has been moved to the broken line position of Fig. 3 and the narrow edge of the member 79 passed over the tooth i i of the dog so the latter has been freed and has immediately returned to normal position awaiting the resetting of the trigger t5 and lever 49.

It will be understood that the present stop mechanism is quite rapid in its action and that it will serve to prevent the accumulation of misplaced sheets about the impression cylinder. The mechanism operates immediately anything happens to disrupt the vacuum system so that if the suckers have picked up a sheet without the sheet being properly aligned so that even one sucker is exposed, the plunger s2 is dropped and the tripping mechanism 59 set for the operation of the trigger 49 in the next forward movement of the bed I4. Thus, the present meansdoes not permit of any error being repeatedbut stops the press practically at the start of an error and thus avoids damage to the press such as would result from an accumulation of errors.

Also, the present means operates to stop the machine without destroying the established cycle of operation or" the press. Therefore, when any difficulty has been remedied, the operator merely resets the trigger B3 and brake lever t6, the press starts up at any place in its established cycle at which place it was stopped. Further, the pr!- ent mechanism is effective to automatically stop operation of the press after the last sheet has been fed or transferred from the pile it to the impression cylinder. At such time when the suckers return-to the feeder tabla-there is no smear;

9 sheet for them'to-pick up or to seal them and thus the vacuum system is open to atmospheric pressure and the entire press is brought to a stand-still.

Having thusset forth-the'nature of-my-invention, what I claim is:

1. In a printing press including'a'n impression cylinder, a transfer mechanism -;for transferring sheets from a pile'to said cylinder, said transfer mechanism including a suction system, a bed reciprocable beneath said cylinder, a-ina-in drive shaft, a drum on and rotatable with'said shaft, a brake band about'said drum, a lever controlling tightening of said band about said drum to stop the same and said shaft, a spring normally urging said lever'toposition to tighten said band on said drum, a trigger device for retaining said lever in position against the tendency of said spring and with said brake band in released'position, a control circuit for-the driving of said-press, and a micro-switchcontrolling said circuit and positioned for operation by said trigger as the latter is moved to release said lever for tightening of said brake band-on said drum, a trip duvice on said press, means connected in said suction system andmaintaining said 'trip device in inoperative position while said system is closed and releasing saidtrip device -for movement to operative position on opening of said system to atmospheric pressure, and means on said bed and operative during movement of the latter in one direction to engage said trip device when the latter is in its last mentioned position and shift the same to operate said trigger "to open said micro-switch and release said lever to permit movement of the latter-by said spring to tighten said brake bandon said drum whereby to bring said press tea-stop. V

2. In ..a printing press, a transfer mechanism including a suction system, a microswitch controlling the power circuit of -said press, a brake actuating lever for applying a braking action to a given part of said press, a spring connected to said lever to'move it inbrake applying direction, a pivoted trigger having a-contaet-pa-rt normally out of engagement :wi thsaid microswitch and adapted upon movement -of said trigger to engage and open said -m=icroswitch, and a retaining part normally :engaged with said lever to retain 'itagainst the action of said spring in brake releasing position and adapted uponmove' to maintain said tripping means in an imperative position while said vacuum system isounder suetion and is closed toatmosphere.

3. In a printing press including animpression cylinder and a bed. horizontal-1y reciprocable beneath said cylinder, saidpress-compri-sing a transfer mechanism includinga-suc'tion system for moving sheets from -apil'e tosaid cylinder, a microswitch ooh-trollingthepower circuit of said press, means for applying-abraki-ngaction to a given'partof'said press, a pivotally mounted trigger positioned-for-rocking 'movement'to opensaid microswitch and normally 'maintainingsaid braking mechanism inoperative, a trip-means;

said trip means comprising a mounting bracket secured to said press, a lever eccentrically pivotedjintermediate its endsto said bracket wherebylthe lever tends to rook about its pivot in one direction, a pair of studs extending "from one side of the short endrportion of said lever, a dog comprising an elongated body against said side of saidend portion of said lever and extending beyond the outer end of said end portion of the lever andhaving an upstanding tooth on its portion beyond said .end portion of the lever, said dog having a pair of slots through said body portion and through whichsaid studs extend, a spring anchored at one :end to said dog and at its other end to said lever and normally urging said dog toward side-by-side relation with said end portion of said lever whereby said dog is located with said studs in the forward ends of said respective slots, said slots inclining from their outer toward'the'ir inner or adjacent ends whereby said dog normally .is held by said spring in a position with its toothed portion extending upwardly at an incline and whereby on said dog being moved forwardly relative to said lever and against the tendency of .said spring said studs will be in the rear portions of the slots and said dog body portion will be substantially parallel with said lever, means connected in the vacuum system of the transfer mechanism of said press and serving to .maintdinsaid trip means in an inoperative position while said vacuum system is under suction and is closed to atmosphere and for releasing said trip means for movement to operative position on opening of said system to atmospheric pressure, and a part rigid with and reciprocable with said 'bed and operable during movement of thelatter in one direction when said trip means is in operative position to engage said tooth and slide said dog against the tendency of said spring to engage and rock said trigger to open said microswitch and release said brakin mechanism for braking action on said given part of thepre'ss.

4. Ina printing press including an impression cylinder anda bed horizontally reciprocable beneath said cylinder, a transfer mechanism including a suction system, said transfer mechanism operable to transfer a sheet from a pile to said impression cylinder, 2. microswitch controlling the power circuit of said press, means for applying abraking action to agiven part of said press, a pivotally mounted trigger positioned for rocking movement to open said microswitch and normally maintaining said braking mechanism inoperative, a tripping mechanism comprising a mounting bracket on said press, a lever pivotally mounted on said bracket intermediate the ends of the lever, a vacuum operated plunger connected with one end portion of the lever and adapted. to maintain the latter in apredetermined inoperative position while vacuum is maintained in said suction system, a dog, means mounting said dog. on the other end portion of said lever for movement therewith .andfor sliding movement relative theretm said means mounting said dog for both a movement longitudinally of said leveriasnda movement downwardly with respect to said-lever, rigid means on and reciprooable with said bed andpositioned to engage and slide said dog toengage and rock said trigger to open said microswitch and release sai'dbraking mechanism for bra-kingaction .On' said given part of the press, and meansiconnected in 'the vacuum system of'the' transfer mechanism. and serving to maintain said tripping means including said dog inarr inoperative position relative to said moving part of the press while said vacuum system is under suction and is closed to atmosphere.

5. In a printing press including an impression cylinder and a bed horizontally reciprocable beneath said cylinder, a transfer mechanism for transferring a sheetfrom a pile to said cylinder, said transfer mechanism including a suction system, a switch controlling the power circuit of said press, means for applying a braking action to a given part of said press, a pivotally mounted trigger positioned for rocking movement to open said switch and normally maintaining said braking mechanism inoperative, a tripping device for said trigger, said device including a mounting bracket secured on the press, a lever pivoted intermediate its ends to said bracket, a pair of studs extending from one side of an end portion of said lever, a dog comprising an elongated body against said side of said end portion of said lever and extending beyond the outer end of said end portion of the lever and having an upstanding tooth on its portion beyond said end portion of the lever, said dog having a pair of slots through said body portion and through which said studs extend, a spring anchored at one end to said dog and at its other end to said lever and normally urging said dog toward side-by-side relation with said end portion of said lever whereby said dog is located with said studs in the forward ends of said respective slots, said slot-s inclining from 7 their outer toward their inner or adjacent ends whereby said dog normally is held by said spring in a position with its toothed portion extending upwardly at an incline and whereby on said dog being moved forwardly relative to said lever and against the tendency of said spring said studs will be in the rear portions of said slots and said dog body portion will be substantially parallel with said lever, rigid means on and reciprocable with said bed and positioned to engage said tooth during movement of the bed in one direction and shift said dog in the direction of the lengths of said slots to'engage and rock said trigger to open said switch and release said braking mechanism for braking action on said given part of the press, and means connected in the vacuum system of the transfer mechanism of said press and serving to maintain said tripping device including said dog and its tooth in an inoperative position with relation to said moving part of the press while said vacuum system is under suction and is closed to atmosphere.

6. In a printing press including an impression cylinder and a bed horizontally reciprocable be-' neath said cylinder, a transfer mechanism for transferring sheets from a pile to said cylinder, said transfer mechanism including asuction system, a switch controlling the power circuit of said ipress, means for applying a braking action to a given part of said press, a pivotally mounted trigger positioned for rocking movement to open said switch and normally maintaining said braking mechanism inoperative, a trip device including a mounting bracket secured on the press, a lever pivoted intermediate its ends to said bracket, a body on said bracket and'having a cylindrical recess opening through its lower end, a plunger including a portion in said recess and a head at its lower end and connected with one end portion of said lever, a pair of studs extending from one side of the other end portion of said lever, a dog comprising an elongated body portion against said side of said end portion of said lever and extending beyond the outer end of said end portion of the lever and having an upstanding tooth on its portion beyond said end portion of the lever, said dog having a pair of slots through said body portion and through which said studs extend, a spring anchored at one end to said dog and at its other end to said lever and normally urging said dog toward side-by-side relation with said end portion of said lever whereby said dog is located with said studs in the forward ends of said respective slots, said slots inclining from their outer toward their inner or adjacent ends whereby said dog normally is held by said spring in a position with its toothed portion extending upwardly at an incline and whereby on said dog being moved forwardly relative to said lever and against the tendency of said spring said studs will be in the rear portions of said slots and said dog body por tion will be substantially parallel .with said lever, said cylindrical recess connected in the vacuum system of said transfer mechanism whereby when said system is filled said plunger is drawn into said recess, said plunger when drawn into and held in said recess holding said lever in a position with said dog substantially horizontal, rigid means on and reciprocable with said bed and positioned to engage said tooth during movement of the bed in one direction and slide said dog in the direction of the lengths of said slots to engage and rock said trigger to open said switch and to release said braking mechanism for braking action on said given part of the press, and said plunger while in said recess and under the control of the suction of the suction system of the transfer mechanism of the press having an inoperative position with respect to said moving part of the press.

7. In a printing press including an impression cylinder and a bed horizontally reciprocable beneath said cylinder, a transfer mechanism for transferring sheets from a pile to said cylinder, said transfer mechanism including a suction system, a switch controlling the power circuit of said press, means for applying a braking action to a given part of said press, a pivotally mounted trigger positioned for rocking movement to open said switch and normally maintaining said braking mechanism inoperative, a trip device including a mounting bracket secured on said press, a lever pivoted intermediate its ends to said bracket, 3, body on said bracket and having a cylindrical recess opening through its lowerend, a plunger including a portion in said recess and a head at its lower end and connected with one end portion of said lever, a pair of studs extending from one side of the other end portion of said lever, a dog comprising an elongated body portion against said side of said end portion of said lever and extending beyond the outer end of said end portion of the lever and having an upstanding tooth on its portion beyond said end portion of the lever, said dog having a pair of slot through said body portion and through which said studs extend, a spring anchored at one end to said dog and at its other end to said lever and normally urging said dog toward side-byside relation with said'end portion of said lever whereby said dog is located with said studs in the forward ends of said respective slots, said slots inclining from their outer toward their inner or adjacent ends whereby said dog normally is held by said spring in a position with its toothed portion extending upwardly at an incline and whereby on said dog being moved forwardly relative to said lever and against the tendency of said spring said studs willbe in the rear portions of said slots and said dog body portion will be subst'a'ntially' paralIel Withsaidlevel, said cylindricalre'cess ccmiected" inthe; sucticn system or said transfer rnechanisnfwhereby the suction in said movement of the bed in one direction andslidesaiddog in the direction of" the" lengths; of; said slots against; the action of-saidfspring to engage androck said trigger to open said switch: and release said; braking mechanism for bra tion n said given part of theprfess whe plunger isfnot-held in said recess on movement of said plunger out-of said cylindrical recess by the last mentioned spring on failure of suction pressure in said suction system.

8. In a printing press including an impression cylinder and a bed horizontally reciprocable beneath said cylinder, a transfer mechanism for transferring sheets from a pile to said cylinder, said transfer mechanism including a suction system, a switch controlling the power circuit of said press, means for applying a braking action to a given part of said press, a pivotally mounted trigger positioned for rocking movement to open said switch and normally maintaining said braking mechanism inoperative, a tripping mechanism comprising a mounting bracket secured on said press, a lever pivotally mounted on said bracket intermediate the ends of the lever, a vacuum operated plunger connected in said suction system and connected with one end portion of the lever and adapted to maintain the latter in a predetermined position while suction is maintained in said system, a dog, means mounting said dog on the other end portion of said lever for movement therewith and movement relative thereto, said means mounting said dog for both a sliding movement longitudinally of said lever and a movement downwardly with respect to said lever, said last means comprising a pair of studs projected from said lever and a pair of slots in said dog and inclining toward one another, rigid means on and reciprocable with said bed and positioned to engage said dog and slide the same in the direction of the lengths of said slots to engage and rock said trigger to open said switch and release said braking mechanism for braking action on said given part of the press, and said vacuum operated plunger connected in the suction system of said transfer mechanism whereby said tripping means is maintained in an inoperative position while said suction system is under suction.

9. In a printing press, a transfer mechanism including a suction system, a main drive shaft, a drum on and rotatable with said shaft, brake means for braking engagement with said drum, a lever controlling application of said brake means to said drum to stop the same and said shaft, a spring normally urging said lever to position applying said brake means to said drum, a trigger device having a contact part and a retaining part, said retaining part normally retaining said lever in position against the tendency of said spring and with said brake means in released relation to said drum and adapted to release said lever upon movement of said trigger device, a con- 14 trolcircuitfOr-the drivingcr s'aidpresaaswitch controlling said circuit and positioned for operation' by said contactpart of said trigger as the latter'ismoved: to release said lever ror ap-' plication of said brake means to; saiddrum, a trip; device on said press, means connected said suctionsystem and maintaining said trip device inoperative position while said systemis closed and releasingsaid trip device for move-; merit to operative posi tion on opening of said system toatmosphericpressure, said press in cluding a movable part to engage said trip; device when the latteris its last mentioned position and: shift the? same to operate s'aidtrigger to" i opensaid switcha'n'd release said-lever to permit of movement of the latter by said spring to apply said brake"- meansto said drum whereby tobring said resstdastop.

10. In a printing press comprisinga transfer mechanism including a suction system and; an electrical power circuit, a switch an controlling s'aid c'ircuit, meansforapplying a-brakihg action to a part of said press, a spring normally urging said means to brake applying position, a trigger having three angularly related arms, means pivotally mounting said trigger in a position with one of its arms latching said brake applying means in released position against the tendency of said spring but for movement in one direction to release said means and with another arm positioned to open said switch on pivotal movement of the trigger in the mentioned direction, a trip device on said press, means connected in said suction system and maintaining said trip device in inoperative position while said system is closed and releasing said trip device for movement to operative position on opening of said system to atmospheric pressure, said press including a movable part to engage and shift said trip device when the latter is in said operative position, "and said trigger having its third arm in the path of movement of said trip device when the latter is shifted by the moving part of the press whereby said trigger arm is engaged by said trip device and said trigger is rocked on its pivot to have its first mentioned arm engage and open said switch and its second mentioned arm release said brake applying means.

11. In a printing press including an impression cylinder, a transfer mechanism for transferring sheets from a pile to said cylinder, said transfer mechanism including a suction system, a frame, a bed reciprocable on said frame beneath said cylinder, power means, control means operable to control said power means whereby the press is started and stopped, trigger means for effecting the operation of said control means, and a trigger tripping mechanism comprising a lever pivotally mounted on said frame intermediate the ends of said lever, a vacuum operated plunger in communication with said suction system connected with one arm of said lever and adapted to draw said arm in one direction while vacuum is applied to said plunger whereby the other arm is moved in the opposite direction, lever actuating spring means arranged to move said lever in the opposite direction upon failure of the vacuum, a dog, means mounting said dog on said other arm of said lever for swinging movement therewith and for longitudinal movement thereon from a normal position, spring means exerting longitudinal force in one direction on said dog to return it to normal position from a longitudinally moved position, trigger actuating means on said dog arranged to move said trigger means in control operating direction through longitudinal move-' ment of said dog in opposition to said last mentioned spring means, a bed engaging par-t on said dog arranged to be contacted by a dog engaging part on said bed as the latter reciprocates in the direction of the trigger actuating direction of longitudinal movement of said dog, said part on said dog being out of the path of said part on said bed in the vacuum moved position of said lever and being moved into said path by said lever actuating spring means upon failure of said vacuum.

12. The invention as defined in claim 11 further characterized in that said means mounting said dog on said lever includes a cam slot connection whereby said dog has relative tilting movement on said lever as it is longitudinally moved thereon to disengage said dog and bed carried parts at one point in the longitudinal trigger actuating movement of the dog.

13. The invention as defined in claim 11 further characterized by cooperating cam parts on said 16 dog and bed for tilting said lever from its spring moved position in the path or said dog engaging part of said bed in opposition to said lever actuating spring means as said bed moves in opposite direction to the trigger operating direction of longitudinal movement of said dog.

JOHN F. BANTHIN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS

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