US772705A - Throw-out mechanism for printing-presses. - Google Patents

Description

No. 772,75. `IA'IEN'IED OCT. 18, 1904.

T. C. DEXTER.

THROW-OUT MEGHANISM FOR PRINTING PRESSES.

APPLICATION FILED snPT. 27. 1901. N0 MODEL, I l -a sums-SHEET 1.

PATBNTED'VUGT. 18,' 1904.

y T. c. DEXTER. THROW-OUT MESHANISM PoR PSII-mmv. PRESSES.

` APPLIGATIQN FILED SEPT. 27, 1901.

6 SHEETS-SHEET 2.

4NO MODEL.

uw! v 'a'in ew? u, y HEM 10.772,705. EATENTED 007.18, 1904.

` fr. C. DEXTER.

THROW-OUT MECHANISM EOE PRINTING PRESSES.

APILIOATION FILED SEPT. 27, .1901'.

NO MODEL. 6 SHEETB-SHEVET 3.

. 7/ 173'; V 4 .fuel hun. .J

',PATENTEE 00T. 18, 1904.

T. c. DEXTER. Y THROW-OUT MEGHAN'ISM EOE PRINTING PRESSES.

APPLICATION FILED SEPT. 27, 1901.

6 SHEETS-SHEET 4.

N0 MODEL.

PATENTED OCT. I8, 1904.

T. G. DEXTER. THROW-OUT MEGHANISM POR PRINTING PRESSES.

APPLICATION FILED SERT. 27, 1901.

6 SHEETS-SHEET 5.

N0 MODEL.

ft ',M

' T. C. DEXTER. 1 THROW- OUT MEGHANISM E'oR PRINTING PRESSES. i

APPLIOATIQN TTLED SEPT.27, 1901. v

No MODEL, l @SHEETS-SHEET e.

v @a/fm,-

RATERTED 00T. 1S, 1904.

vUNITRD STATES' Patented October 18, 1904.

PATENT OFFICE.

. TALBOT c. DEXTER, or vPEARL RivRR, Niiw YORK.

THROW-OUT MECHANI'SM FOR PRINTING-PRESSES.

SPECIFICATION forming Apartvof Letterslatent No. '772,705, dated October 18p, 1904.. l Application filed September 2'l7, 1901. g Serial Nb. 76,728. (No model.) y I To @ZZ whom, it may concern.' i

Be it known that I, TALBorQjDEXTER, a citizen of the United States, residing at Pearl River,- in the county of Rockland and State of New York, have invented certain new and useful Improvements in Throw-Out Mechanism for Printing-Presses, of which the following is a specification. v

The object of my inventionis to produce a simple and effective mechanism for arresting the operation of a printing-press or other machine runder theautomatic control of the successive sheets of paper which are operated upon by the printing-press or other machine.

In feedingsheets ofv paper to a printingpress or -other machine the successive sheets which are to be operated upon are placed upon the feed-board of the printing-press or other machine in engagement with the front guides of the machine and then registered laterally y by some suitable side-registering device to properly position the sheets with respectto the printing mechanism or other mechanism which is to operate upon the sheets.

The main feature of novelty in my present invention consists in the construction and arrangement of the press throw-out mechanism in combination with suitable side-registering mechanism and a vsheet-actuated controlling device, whereby the throw-out mechanism under the control of the sheet-actuated controlling device ,will be operated by the sideregistering mechanism. In addition to thisv main feature my present invention comprises an improved construction of sheet-actuated tripping device for controlling the throw-out mech'anismand other features of construction of the combined devices for producing the desired result in a simplel and effective manner.

In order that my invention'may be fully understood, I will first describe the same with reference to the accompanying drawings and afterward point out thenovelty with more particularity in the annexed claims.

In the accompanying drawings, Figure 1 is adetail side elevation of my improved automatically controlled -throw out mechanism applied to the feed-'board of a printing-press. Fig. l is a detail side elevation of the controller-disk, showing it in shifted position withthe-electric circuit broken. Fig. 2 is a detail plan viewA of the mechanism'shown in Fig. l; Fig. 3 is a detail side elevation 'of part of the mechanism shown in Fig. l, representing the operating connection betweenmechanism. Fig. lOis aidetail transverse sectional View taken4 on the line a ci of Fig. 9.

Fig. ll is adetail plan view of parts of the` sideregistering device and its operating cambar.

1 is part of one of the sideframes of a printing-press of any suitable construction-J` 2 represents the" impression-cylinder of the, press, journaled in the side frames l upon the.

trunnions 3. Journaled in the bracket-arms extending vup from the side frames l of the press, is a rock-shaft 5, upon which are mountf ed the front guides ofthe press. Any suitable device may/be employed for rocking the shaft 5 foi-fthe purpose of throwing the front guides down into gaging position and raising them into inoperative position at proper points in the operation of the press. l This mechanism is very common and well understood in the art and has not been illustrated. The front guides and cooperating devices will be hereinafter referred to. y

I have shown my improvements applied to a two-revolution press;V but it will be clear to those skilled in the art that my invention is applicableto any form of printing-press or other machine designed to operate upon successive sheets ofpaper in which it is desired tocontrol the operation of the machine by the correct `positioning of the successive sheets. v

l0 is a feed-board of ordinary construction Fig. 9 is a detail plan viewl representing part of the side registering Fig. L! is a view similar to Fig.

suitably mounted in proper relatior'to the impression-cylinder 2 of the printing-press. Projecting forwardly from the inner end of the feed-board 10 are the under guide-lingers 11, which will be hereinafter more fully referred to. A series of conveyer bands or tapes 15, passing over a roller 16, suitably journaled above the upper face of the feedboard 10, are arranged to convey successive sheets of paper from an automatic feedingmachine (not shown) to the printing-press. These bands or tapes 15 deposit the sheet upon the feed-board with its forward edge in contact with the printing-press front guides in readiness for the operation of the side-registering mechanism. This latter mechanism will now be described.

The specific construction of the side-registering mechanism forms no part of my present invention, and any suitable side-registering mechanism may be employed in combination with the other devices hereinafter referred to. For the purpose of illustrating my invention I have shown in the drawings and will 4now describe in a general way the side-registering mechanism covered by my Patent No. 669,724, granted March 12, 1901, for improvements in sheet-conyeyer frames. The mechanism set forth in this patent comprises two laterally-operating paper-shifting grippers disposed in reverse positions in relation to each other and adjacent to the opposite sides of the feed-board. The operating devices are constructed so that either one of the side-registering grippers may be employed, so that the sheets can be registered from either side. I have shown but one of the side-registering devices. c' is one of the reciprocating transverse bars having a spring 2 for moving it inwardly and supported in suitable guides on the brackets. The outward movement of the bar is effected by means of alongitudinally-movable cam-plate j', mounted in suitable guides. The cam-plate j is adapted to engage a roller j, carried by the bar t', for moving the bar/ outwardly. A rod R is connected with the cam-plate j and reeiprocatedA by any suitable cam mechanism, (not shown,) which may be operated from the feeding-machine. /c denotes the gri pper-shoe, which is formed with a longitudinal passage to receive the marginal portion of the sheet of paper This gripper-shoe is adjustably mounted upon the bar t' in any suitable manner, such as set forth in my above-named patent, No. 669,724. N denotes the gripperfinger, which is fastened to a transverse shaft N', suitably journaled upon top of the gripper-shoe and in a bracket mounted upon the bar e'. To the other end of the shaft N is rigidly secured a radially-projecting lug m, and in .front and rear of said portion of said shaft are posts m', projecting up from the face of the cam-plate j', in which are adjustably mounted studs or tappets m2, disposed to strike the llug m alternately upon opposite sides during the reciprocating` movement of the cam-plate j. The gripper-linger N hasa rearwardly-extending arm O, and pivotally connected to the Jfree end of said arm is a rod O,whieh passes diametrically through a barrel O2, pivotally supported upon the gripper-shoe 'f. A spring O, surrounding the rod O', bears with its opposite ends on the arm O and barrel'O2 to cause the gripj'ier-{in ger to be thrown quickly past the center of its motion to produce a snap action, so as to quickly and irmly grip the paper in the shoe or quickly release the paper. The operation of this side-registering mechanism will be more clearly understood after referring to my above-named patent, No.669,724, the corresponding parlsof the structure being indicated in my present ease by the same rcference-cliaracters that are used in said patent.

2O is a controller-disk journaled at 21 upon a suitable bracket 22,seeured beneath the feedboard 10. The controller-disk 2() carries an electric contact-arin 25, from which extends a circuit-wire 26. Mounted upon a bracket 27 is a spring contact 28, from which extends another circuit-wire, 29. The contacts and 28 constitute an electric switch which controls the electric circuit of any suitable electric motor which operates the printing-press or other machine which is to be controlled, or, if preferred, the electric switch may control any suitable electric device which is independent of the motive power of the press or other machine and serves the purpose solely of throwing the press or other machine into and out of operation. The speciic :form of the controlling mechanism is iimnatcrial to my present invention, and, in fact, it is not essential whether the controlling mechanism is mechanical or electrical, it being well understood in the art that the controller-disk 2() may be connected in various ways, either electrically or mechanically, with any suitable controlling mechanism for producing the desired result.

A rod 3() is journaled at 31 to the controllerdisk 2() and at 32 to a rock-arm 33, which is in turn journaled at 34 to the bracket l). By roeking the arm 33 rearwardly and forwardly the controller-disk ZO is rotated upon its journal 21 to break and make the contact of the electric circuit for arresting and starting the operation of the machine. Projecting forwardly from the rock-arm 33 is a rod 40, which is journaled to the rock-arm at 41 and carries an adjustable block or tappet 42 formed with a rear curved or caln face 42, and secured in the desired adjusted position upon the rod 40 by any suitable means, such as a set-screw 43. The rod 40 is controlled by the mechanism presently to be described. rhen the rod is in its lowermost position and the cam-plate j is moved rearwardly, a plate 44, projecting from the forward post fm', will engage the tappet 42, forcing the rock-arm 33 rearwardly IOO IOS

tappet42 will not be engaged by the plate 44,

and the controlling mechanism will therefore not be operated. An upright post- 45 is mountedion a stationary part of the frame to one side of the line of travel of end of plate 44 and in the path of tappet 42. When the tappet 42, engaged byplate 44', is forced rearwardly for operating the throw-out mechanism, the cam-face 42ab engages the post 45 and lifts the tappet 42 outl of engagement with the plate 44, thereby stopping the movement of bar and allowing cam-plate j tov complete its stroke.l l

is a rock-shaft suitably journaled in bracket-arms 51vabove the forward 'edge of the feed-board 10. The rock-shaft 50 extends transversely of the machine. Keyed' to the rock-shaft 50 is a rock-arm formed with a bifurcated or forked finger 53, in which rests the free end ofthe rod 40. The fork of linger 53 guides the rod 40, whereas the u p-and-down movement of rock-arm 52 raises and lowers the tappet 42 with respect to the plate 44, carried by the post m. A spring 54 connects an arm or lug 55 of rock-shaft 50 with a stationaryfpin 56 for imparting to the rock-shaft 50 and its connected parts a spring tendency to move in one direction. A rod 60 is jour naled at 6l tothe rock-arm`52 vand extends downwardly therefrom and carries' at its lower end an antifrictio-nLroller 62, which runs upon the periphery of a cam 63, journaled upon a supporting-arm 64 and having secured to it a gear 65, which is in constant mesh with a smaller gear 66, keyed to the axle 3 of the impression-cylinder. rlhe gears 65 and66 are in the proportion of two to one, so that the cam 63 willmake but one revolution for every two revolutions of the impression-cylinder of i' face of the cam.

the press. The rod 60 is formed adjacent to its lower end with an elongated guiding-slot 60a, which works upon the journal of thecam 63, a washer 67 confining the rod 60 against the The cam 63 has a cut-out or low portion 63, which allows the'spring 54 to raise rod 60 and rock-arm 52 once in every revolutionof the cam 63. The high portion of the cam depresses the rod 60 and rock-arm v52 and holds them in depressed or lowered position against the tendency of spring 54 for the greater part of the revolution of cam63. 70 represents the front guides of the printing-press adjustably mounted upon the arm 7l, which are secured upon the rock-shaft 5, above referred to. Each front guide 70 is centrally cut out at 7l to allow'the free passageof the tripping-arm 7 2, which is freely journaled upon the lower end of the rockarm 73, depending from and keyedto the rockshaft 50. i

Each of the front guides 7 O rests, when in gaging position, upon one of the under guides 11. The under guides are constructed, a's' shown in Figs. 6, 7, and 8 of the drawings, with the longitudinal slot lla, in which is mounted an adjustable stop-plate 7 5,'formed` with a tapered depression 76, having a shoulder 77. The stop-'plate 75 is adjustably se` .cured in the slot of the under guide by means of a countersunk set-screw 78, which passes through the stopplate 7 5and is threaded into a lower plate 79. The walls of the slot 1la are beveled, asshown, and the edges o f stop-plate'75 and lower plateV 79 are correspondingly beveled, so as to be supported iiush with the surfaces of the under guide. The purpose of stop-plate 77, which is mounted in the same vertical plane as the trippingarm 72, is to engage the end of the trippingarm to prevent its forward movement over the under 'guide when a sheet is not in proper position for feeding to the press.

The operation of my improved sheet-controlled throw-out mechanism willV be clear .fromthe following explanation: The succesof the press, which are in lowered position at such times.n If a Vsheet reaches the proper registered position against the front guides, it is registered laterally` by the side-register ing mechanism above described in the'manner fully set forth in my above-named patent, No. 669,7 24. While the sheet is being fed into registered position against the 4front guides the trippingarms 72 are Aheld in their rearmost position by reason of the fact that the high part of the cam 63 will be in engagementv with the anti friction-roller 62, carried by rod 6C).A Immediately after the sheet has reached the front guides 70 the low portion 63iL of cam 63 reaches antifriction-roller 62 and allows'spring 54 to move the tripping-fngers 72 forwardly. position, it will be clear that the forward ends of the tripping-fingers will slide upon the sheet and pass over the shoulders 77 in the stopiplates 75. The movement of the rockshaft 50, under action of spring 54, to cause 1 the tripping-fingers 72 to move forwardly also effects'the raising of the'rock-arm 50, which in turn lifts the rod 40 to cause it to move tappet 42 out of the path of the arm 44, carried by the post m. The sheet is then regis- IOO The sheet being in registered tered laterally, andthe throw-out mechanism will not'operate. If, however, a sheet fails j to reach the registered position at the moment that rock-shaft 50 is moved'by spring 54, it f will be clear that the forward Vend of one of the tripping-lingers 72 will slide into engagement with 'shoulder 77 ofthe stop-plate and-vl prevent the further movementof shaft 50. This will hold the rock-arm 52 in its lowered position, which willallow the throw-out-op-` erating rod 40 to also remain in lowered pof'sition, so that when the slide'j of the side` registering mechanism moves rearwardly the arm 44 will engage the tappet 42 and force the rock-arm 33 rearwardly, which will in turn move the controller-plate 2O upon its bearing, with the result that the circuit will be broken at contacts 25 and 28, and the machine will be thrown out of operation, as above explained.

While I have shown in the drawings and specifically described one of the sheet-actuated tripping devices for controlling` the throw-out mechanism, l would have it understood that `two of such devices are employed, one at each side of the line of feed of the sheets in the vertical planes of the usual under guides and front guides with which printing-presses are equipped. Both of these tripping devices control the throw-out mechanism, so that the press will be tripped when the sheet fails to reach registered position at either side. rI`hus when a sheet is fed at an angle to the front guides only one of the tripping devices would be actuated, and the press would be thrown out.

I desire to claim, broadly, an automatically-controlled throw-out mechanism for a printing-press or other machine designed to operate upon sheets of paper passed through it in combination with a side registering mechanism, operating' means for the sideregistering mechanism adapted to also operate the throw-out mechanism, and a sheetcontrolled tripping device adapted to operatively connect and disconnect the stop mechanism and the operating' means of the sideregistering mechanism. I also desire to claim the specific form of sheet-actuated tripping device and the means for operating it, as above described.

Having thus described my invention, the following is what I claim as new therein and desire to secure by Letters Patent:

l. In combination with a machine designed to operate upon sheets of paper passed through it, and stop mechanism adapted to automatically arrest the operation of said machine, suitable side-registering mechanism for the sheets, means engaged and operated by the side-registering mechanism for actuating the stop mechanism, and a suitable sheet-actuated tripping device controlling the engagement of the actuating means of the stop mechanism by the side-registering mechanism, substantially as set forth.

2. In combination with a machine designed to operate upon sheets of paper passed through it, and stop mechanism adapted to automatically arrest the action of said machine, suitable side registering mechanism for the sheets, a reciprocating slide adapted to operate the registering mechanism, a part connected with the stop mechanism adapted to be engaged and operated by said reciprocating slide to actuate the stop mechanism, and automatically-controlled means for moving said part into and out of operative relation with said slide, substantially as set forth.

3. .ln combination with a machine designed to operate upon sheets of paper passed through it, and stop mechanism adapted to automatically arrest the operation of said machine, suitable side-registering mechanism for the sheets, a part connected with the stop mechanism adapted to be engaged by the sideregistering mechanism for actuating the stop mechanism, and automatically -controlled means for moving said part into and out of operative relation with the side-registering mechanism, substantially as set forth.

4. In combination with a machine designed to operate upon sheets of paper passed through it, and stop mechanism adapted to automatically arrest the operation of said machine, suitable side-registering mechanism for the sheets, operating means for the side-registering mechanism, and a suitable sheet-controlled tripping device adapted to operatively connect and disconnect said stop mechanism and said operating means, substantially as set forth.

5. In combination with a machine designed to operate upon sheets of paper passed through it, and stop mechanism adapted to automatically arrest the operation of said machine, suitable side-registering mechanism for the sheets, operating means for the side-registering` mechanism adapted to also actuate the stop mechanism, a shiftable part interposed between said operating means and said stop mechanism, and a suitable sheet-controlled tripping device constructed and arranged to control said shiftable part to connect or disconnect the stop mechanism and operating means, substantially as set forth.

6. In combination with a machine designed to operate upon sheets of paper passed through it, and stop mechanism adapted to automatically arrest the operation of said machine, suitable side-registering mechanism for the sheets, a part connected with the stop mechanism adapted to be engaged by the side-registering mechanism for actuating the stop mechanism, means for moving said part into and out of operative relation with the registering mechanism, and a sheet-actuated tripping device adapted to retain said part in its operative relation with the registering mechanism, substantially asset forth.

7. In combination with a machine designed to operate upon sheets of paper passed through it, and stop mechanism adapted to automatically arrest the action of said machine, suitable side registering mechanism for the sheets, a part connected with the stop mechanism and adapted to be engaged and operated by the said registering mechanism, a springactuated device adapted to move said partout of engagement with the registering mechanism and hold it normally in said disengaged position, means for operating said spring-aclOO lIO

anism and adapted to be engaged and operated by the said registering mechanism, a springactuated device adapted to move said partout of engagement with the registering mechanism and hold it normally in position, means for operating said spring-actuated device to cause said part of the stop mechanism to move into operative relation -With the registering mechanism, ra sheet-controlled tripping-finger suitably connected with said spring-actuated device and adapted to restrain said spring-actuated device to allow the throw-out to operate, and a device with which said trippingfinger is adapted to engage in the absence of a sheet, substantially asset forth.

9. In combination with a machine designed to operate upon sheets of paper passed through it, and stop mechanism adapted to automatically arrest the action of said machine, suitable sideregistering mechanism for the sheets, a part connected with the stop mechanism and adapted to be engaged and operated by the said registering mechanism, a device adapted to automatically move said part out of engagement with the registering mechanism and hold itnormally in said disengaged position, means for operating said device to `cause said part of the stop mechanism to move into operative relation lwith the registering mechanism, and a sheet-actuated tripping device arranged to normally prevent the operation of said device, substantially as set forth.

l0. ln combination with a machine designed to operate upon sheets of paper passed through by the said registering mechanism, a devicey adaptedto automatically move said part out of engagement with the registering mechanism and hold it normally in position, means for operating said device to cause said part of the stop mechanism to move into operative relation with the registering mechanism, a sheet-controlled tripping-fingery suitably connected with said device andadapted to restrain said device to allow the throw-out to operate,

and a device with which said tripping-finger is adapted to engage in the absence of a sheet, substantially as set forth. v

11. In a mechanism of the character described,the combination of suitable throw-out mechanism, including an operating-arm, a reciprocatory bar with whichsaid arm is adapted to engage, atappet carried by said operatingarm, means for moving said operating-arm to bring said tappet into and out of operative relation with the operating-bar, and means for automatically disengaging the tappet from said operating-ban@substantially as set forth.

12. In a mechanism of lthe character described,the combination of suitable throw-out mechanism, inclu'ding'an operating-arm, a reciprocatory bar with which said arm is adapted to engage, a tappet carried by said operatingarm, means for moving said operating-arm to bring said tappet into `and out of operative relation with the operating bar, means for maintaining said arm in its operative position, and means for automatically disengaging the tappet from said operating-bar, substantially as set forth. n y

13'. In a mechanism ofthe character described, the combination of suitable throw-out mechanism, an operating-bar, an operatingarm engaging with the throw-out mechanism, a tappet mounted upon said operating-arm and adapted to be engaged by said operating-bar,

said tappet beingformed witha rearwardlypresented cam-face, a stationary post adapted to engagey the cam-face of said tappet to disengage it from the operating-bar, means for moving said arm into and out of operative relation withthe operating-bar, and a sheet-actuated tripping device adapted to maintain said arm in its operative position, substantially as set forth.'

14. In combination with amachine designed to operate upon sheets of paper passed through i it, stop mechanism adapted to automatically arrest the operation of said machine, means for operating said stop mechanism, and a part connected with the stop mechanism and adapted to be moved into and out of operative rey lation with the operating means, with a springactuated vrock-shaft, an arm upon said rockshaft adapted to move said part of the stop mechanism into and out of operative relation with said operating means, 'a sheet-actuated tripping device adapted to retain said rockshaft and its arm in position to cause the operation of the stop mechanism, and means upon the controlled machine through which the sheets are fed for moving said rock-shaft and arm into position to cause theoperationof the stop mechanism, substantially as set forth.

IOO

15. In combination with a machine designed bar out of operative relation with said operating means, suitable cam mechanism upon the controlled machine through Which the sheets of p aper are passed, suitable connection between said cam mechanism and rock-shaft for moving said `rock-arm against the action of said spring into position to allow said rod or bar to rest in operative relation with said operating means, and a sheet-actuated trippingdeviee adapted to retain said operating rod or bar in said operative position, substantially as set forth.

16. In combination with a controlled machine designed to operate upon sheets of paper passed through it, suitable stop mechanism adapted to automatically arrest the operation of said machine, means for operating said stop mechanism, and a rod or bar connected with said stop mechanism and adapted to be moved into and out of operative relation with said operating means, With a spring-actuated device adapted to move said rod or bar into its inoperative position, means upon the controlled machine through which the 'sheets are passed adapted to move said spring-actuated device against the action of its spring to allow said rod or bar to rest in operative relation with the said operating means, and a sheet-actuated tripping device adapted to retain said springactuated device in position to allow the operation of the stop mechanism, substantially as set forth.

17. In combination with a machine designed to operate upon sheets of paper passed through it, a stop mechanism adapted to automatically arrest the operation of said machine, a reciprocatory operating-bar, and a part connected with the stop mechanism adapted to be moved into and out of operative relation with said operating-bar, with a sheet-actuated tripping device controllingl the movements of said part of the stop mechanism and comprising` a reciprocating triparm mounted above the path of the sheets and a stop-plate mounted beneath the path of the sheets and formed' with a depression in which said trip-finger is adapted to engage in the absence of a sheet, substantially as set forth.

18. In combination with a machine designed to operate upon sheets of paper passed through it, a stop mechanism adapted to automatically arrest the operation of said machine, a reciprocatory operating-bar, and a part connected With the stop mechanism adapted to be moved into and out of operative relation with said operating-bar, with a sheet-actuated tripping device controlling the movements of said part of the stop mechanism and comprising a reciprocating trip-arm'mounted above the path of the sheets and a stop-plate .mounted beneath the path of the sheets and formed with a depression in Which said trip-ingeris adapted to engage in the absence of a sheet, said stop-plate being adjustable in the direction of the reciprocation of the trip-arm, substantially as set forth.

19. In combination with a machine designed to operate upon sheets of paper passed through it, a stop mechanism adapted to automatically arrest the operation of said machine, with a sheet-actuated tripping device controllingl the operation of the stop mechanism and comprising a spring-actuated rock-shaft suitably connected with the stop mechanism for controlling its operation, a rock-arm carried by said rock-shaft, a reciprocating trip-arm pivotally mounted upon said rock-arm above the path of the sheets and adapted to reciprocate in the path of the sheets, and a stop-plate mounted beneath the path of the sheets and formed with a depression in which the end of the triparm is adapted to engage in the absence of a sheet, substantially as set forth.

20. In combination -with a machine designed to operate upon sheets of paper passed through it, a stop mechanism adapted to arrest the operation of said machine, a support for sheets fed to said machine, a tripper-stop upon the sheet-support, and a trip-arm mounted above the sheet-support and movable back and forth thercovcr and adapted to engage said tripperstop in the absence of a sheet between them, and means controlled by said trip-arm for causing the operation of said stop mechanism, substantially as set forth.

2l. In combination with a machine designed to operate upon sheets of paper passed through it, a stop mechanism adapted to arrest the operation of said machine, a support for sheets fed to said machine, a part upon the sheetsupport in the plane of feed formed with a depression and a tripper stopor shoulder, and a trip-arm mounted above the sheet-support and movable back and forth thereover and adapted to enter said depression and engage said tripper-stop in the absence of a sheet between them,and means controlled by said triparm for causing the operation of said stop mechanism, substantially as set forth.

22. In combination with a machine designed to operate upon'sheets of paper passed through it, a feed-board, front guides adapted to arrest a sheet in registered position with relation to the said machine, a stop-plate mounted upon said feed-board and formed with a depression, a reciprocating trip-arm supported above the feed-board and adapted to engage in said depression of the stop-plate in the absence of a sheet between them, suitable stop mechanism adapted to automatically arrest the operation of' said machine, and means controlled by said trip-arm for causing` the operation of said stop mechanism, substantially as set forth.

23. In combination with a machine designed to operate upon sheets of paper passed through it, a feed-board, under guides projecting from the forward end of said feed-board, front IOO guides cooperating with said under guides and `having slots cut through them, stop-plates mounted upon the under guides and formed with depressions, trip -arms mounted above the feed-board vand adapted to reciprocate above the stop-plates and through the slots of the front guides, suitable stop mechanism y adapted to automatically arrest the operation operation, a moving controller the arrest of.

which renders said mechanism active, and a fixed stop for said controller so arranged that the engagement of the controller therewith is prevented by the sheet.

25. Mechanism for controlling machines operating upon sheets having in combination, a stop arranged to be covered by theI sheet when in proper position, a reciprocating' controllerfinger arranged to be guided over the stop by the sheet, 4and stopping mechanism thrown into action by the arrest of said finger.

26. Mechanism for controlling machines operating upon sheets, having in combination, throw-out mechanism for the said machine, operating means for the tlirow-out mechanism, a sliiftable part interposed between said operating means and said throw-out mechanism, a controller for said shiftable part, and a controller-stop so arranged that the engagement of the controller therewith isv prevented by the sheet when in proper position, as set forth.l

27. Mechanism for controllingmachines operating upon sheets, having in combination tlirow-out mechanism for thesaid machine, operating means for the tlirow-out mechanism, a part movable into and out of engaged position interposed between said operating means and said tlirow-out mechanism, a-stop larranged to be covered by the sheet when in proper position, a reciprocating controllerlinger arranged to be guided over the stop by the sheet, and a guard-arm connected to and movablev with said controller-finger and controllingthe action of said interposed movable part, as set forth.

28. In combination with a machine designed to operate upon sheets of paper passed through it, a stop mechanism adapted to automatically arrest the operation of said machine, with a sheet-actuated tripping device controlling the operation of the stop mechanism and comprising a yieldingly-actuated rock-shaft suitably connected with the stop mechanism for controlling its operation, a rock-arm carried by said rock-shaft, a reciprocating trip-arm pivotally mounted upon said rock-arm above the path of the sheets, and a stop-plate mounted beneath the path of the sheets and formed with a depression in which the end of the triparm is adapted to engage in the absence of a sheet, substantially as set forth.

29. Mechanism'for controlling machines operating upon sheets, having in combination, normally inactive throw-,out mechanism for lthe said machine, normally active operating ymeans for said tlirow-out-operating mechanism, a part connected with thestop mechanism adapted to be engaged and operated by said operating means, a yieldingly-actuated device normally preventing the engagement of said part by said operating means, a controlling-finger connected with and actuated byV said yieldingly-actuated device, and a stop with which said controlling-finger is adapted to engageto arrest said yieldingly-actuated device and cause the engagement ofy said partl by said operating means. the engagement of said linger with said stop being controlled by the sheet, as set forth.

30. Controlling mechanismA for machines designed to operate upon sheets, having in combination a throw-out mechanism for the said machine, operating means for said throwlout mechanism, coacting members connected respectively to the throw-out mechanism and its operating means, one of said coacting members being movable into and out of engagement with the other coacting member for connectin g and disconnecting the throw-out mechanism and itsoperating means, a rock-arm engaging the movable coacting member for holding. it lout of engagement with the other coacting member, means controlled by tlie sheet suitably connected with said rock-arm for controlling its operation and determining whether the throw-out mechanism shall operate, substantially as set forth.

IOO

.. 31. Controlling mechanism'for machines designed to operate upon sheets, having in combination a throw-out mechanism for the said machine, operating means for said throwout mechanism, coacting members connected I respectively -to the throw-out mechanism and Y.

its operating means, one of said coacting members being movable into and out of engagement with` the other coacting member for connecting and disconnecting the throwout mechanism and its operatingA means, a yieldingly-actuated device engaging the movable coacting member for holding it outof engagement with the other coacting member, means controlled by the sheet'suitably connected with said yieldingly-actuated device for controlling its operation and determining whether thev tlirow-out mechanism shall op-l erate, substantially as set forth.

TALBOT c. DEXTER.

Witnesses:

. J. GREEN,

WM. E. KNIGHT.

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