US1752744A - Sheet-feeding machine - Google Patents

Description

April 1, 1930.

H. K. K| NG SHEET FEEDING MACHINE Original Filed Nov; 4, 1925 8 Sheets-Sheet Apflil l, 1930.

H. K. KING 4 SHEET FEEDING MACHINE Original Filed Nov. 4, 1925 8 Sheets-Sheet 2 Jiiorney April 1, 1930. H. K. KING.

SHEET FEEDING MACHINE Original Filed Nov. 1925 8 Sheets-Sheet 3 on Rm April 1,1930. H. KL KING SHEET FEEDING MACHINE Original Filed Nov. 4, 1925 8 Sheets-Sheet 4 InzJerzZon ward)??? Wkl g ea 8 Sheets-Sheet wsw E 9 ha H K. KING April 1, 1930.

SHEET FEEDING MACHINE Original Filed Nov, 1925 April 1, 1930.

H. K. KING SHEET FEEDING MACHINE Original Filed Nov. 4, 1925 8 Sheets-Sheet April 1, 1930. H. K. KING 1,7

. SHEET FEEDING MACHINE 8 Sheets-Sheet 7 ori inal Filed N v.- 1925 April 1, 1930. H. K. KING SHEET FEEDING MACHINE Original Fild Nov 1925 8 Sheets-Sheet 8 vqitorneyv Patented Apr. 1, 1930 I HOWARD rnorrrnns coMrAnY, A'CORIORATION OFFPENNSYLVAN'IA SHEET-FEEDING MACHINE OI'iginaFiappIicatiOn filed November 4, 1925, Serial %No. 66,763. Divided and this application filed July 15,

1927'. Serial No. 205,872.

The invention relates to improvements in sheet feeding, machines. The L object is to provide improved means for separating and deliveringsinglesheets from a pile of sheets.

The improvements relate to that type of sheet feeding machine commonly knownas the continuous feed type. t

The improvements are especiallyapplicable to machines for i'eedingsheets to a 1 printing; press,

sheets to folders orsimilar devices.

The machine asa whole is similar, in most respects, to that described in my Patent No. 15 1,154,406,

shown as especially applicable toieeding sheets to a folding machine or similar device.

It is thereforebelieved tobe unnecessary 20 to describe in detailthe entire machine which sheet, means for automatically stoppingithe press upon certain conditions, means arbitrarily actuated :for stopping the press, improved means foradjusting the several parts, and improvements in details of construction.-

This application is a division of myapplication Serial. No. 66,763" filed November 1, 1925, which has resulted in Patent No. 1,652, 172 dated December 13, 1927 Referringto the drawings which illustrate merely by Way of example, suitable means for the embodiment of my invention Fig. 1 is a planview showing the delivery and a portion of the feeder.

Fig. 2 is a right hand sid @elevation of the feeder and delivery and a portion of the press.

Fig. 3 is a left hand side elevation of thedelivery with the forwardpart'of the feeder and the rear of thepress shownalthough certain of the improvements are equally applicable to feeding 7 dated Sept. 21,, 19-15, which was or true presentation of the frontedge ofthe rE- s OFFICE-i KIKING; 0F PHILADELPHIA,PENN$YLVANIA, Assren'onw ro CHAMBERS" Fig. 1 is a right hand elevation showing: the; drive and actuation mechanism of the slow-downs.

Fig. 5 is a section on line 5, 5 of Fig. 4.

Fig.6 is an elevation of the slow-down drivingrollers shown in Fig. 1, on an enlarged scale.

Fig. 7 is an enlarged detail of arm and connectlng rods shown in Fig.4.

F ig 8 is a plan view of one of the slowdown rollers.v V r Fig.9 is a section on line 9,'9 of Fig. 8, with the drop roller in elevated position.

Fig. 10 is a side elevation of mechanism for actuating the side guide and ioropening-and closing the slow-down rollers; thisview also shows secondieed'roller in closedposition. I Fig. 11 is a diagrammatic sideelevation of control and tripping. mechanism.

Fig.12 is a section of'theair diaphragm,

shown in Fig. 11.

Fig. 13 is a section of the feeding guide on line 13,13 of Fig. 1, on an enlargedsca'le.

Fig; lei-is a similar view showing-parts in different positions.

Fig-15 is a SBCtlOIl on an enlarged scale-- on line 15 of Fig. 1 l.

Fig..16 is a sect on of a portion of Fig.11,

showing the air passage and control.-

Fig. 17 is a section of a portion connected withthe mechanism shown-in Fig. :11.

Fig. 18 is a section on line 18-,18 of Fig. 11. Fig. 19 is anelevation of some of=the parts shownin Fig. .11 indifferent positions. Y

Fig. 20 is a view similar-to Fig, 19, with some of the. parts in differentpositions. Fig.21 is asection online 21, 2101i Fig.1.- Fig. 22 is anelevation on an enlarged scale? of theend ofconnectingrod as seen on section 22;22 of Fig. 5.

Fig. 231s a-v1ew similar to Fig.z22-with parts in slightly. different position.

Fig.2 1is'asect1on on line 24,2 1 of Fig i, on an enlarged scale. Y Y

Fig; 25 is a front elevation of thepressfeed ing guide on an enlarged scale.

Fig-26 18 a section on 1111626,

Similarinumerals refer to similar parts throughout the several views;

n will be understood that the bank of sheets is delivered around the drum and operated upon by the combing wheel in the manner described in said Patent No. 1,154,406. The front edge of the foremost sheet moves along the feed board 45 ando'ver the steel blades 46,

and passes between the first delivery drop rollers 47 and the feed rollers 48. See Figs. 1 and 21. The said drop and feed rollers, in this case, become part of the feeder, whereas in the device disclosed in said Patent No. 1,154,406, the feeder does not have any drop and feed roller, but uses the folder drop and feed rollers, becoming a complete feeder only 1 when attached to a folding machine.

The trip finger 49 or cut-out, shownin Fig. 21, operates to control a pneumatic valve by rocking the supporting shaft 51 in substantially the same way as that described in connection with Figs. 11, 12 and 14 of said Patent No. 1,154,406, except that the method of mounting and adjustment is different, and

is the subject of a separate application and need not be described in detail here.

The sheet is started and carried by thefirst delivery drop and feed rollers untilitis well under control of the second delivery drop and feedroller. The second delivery drop roller 62 (see Fig. 3) is under the sheet, with its feed roller 63 over the sheet. These delivery rollers have the same surface speed as the first delivery feed rollers. They are closed tightly together to receive the sheet, and act as carriers for the sheet, delivering it to the slowdown rollers 64 and 65, Figs. 8 to 10, and are located approximately half-way between the first drop and feed rollers and the slowdowns. V

The first drop-rollers drop to close the rollers atexactly the right time to start the sheet,

the second drop rollers drop toopen at exactly the right time to deliver the sheet to the slow-downs which are running at a slower surface speed; therefore the delivery must be just right; if too slow in opening, the sheet would bebuckled, if too quick in opening, the

sheet would be left for an interval without positive control. V

The first and second set of drop and feed rollers and the slowdown rollers are shown in pairs. A description of one pair will suffice.

The action of the slow-downs is somewhat similar to the second drop roller, except the drop or moving rollerf65 is on the top. The drop roller 65 is mounted onthe end of arm '66, pivotally mounted at 67 ,and controlled by the helical spring 68and by the flat angle spring 69. These rollers have three positions, the fiatan'gle spring 69 giving the heavy pressure. The light helical spring 68, which by 'Ineans'of the knurled thumb nut 70, is adjustable andcan be made very delicate, as theweight of theroller is very light and is alsocounterbalanced. Fig. 9 shows the rollers separated; they are in this position while the sheet is being side guided, and remain open until the sheet is carried away by the press.

The details of the control of the slow-down drop and feed rollers is made the subject-mat- .ter of said original application Serial No.

66,763, and need not be describedin detail in this application.

The driving of the feeder by the press can best be described by referring to Figs. 2, 3

of the feeder.

Cam shaft 198 (see Fig. 3) is provided with the gear 265, which drives gear 266, which rotates with gear 267. Gear 267 drives gear 268 which is on shaft 72 of the feed roller 48, see Fig. 4. Shaft 72 is provided with the gear 73, driving pinion 74 connected to sprocket 75 carrying chain 7 6 which drives the double sprocket 77, which is connected by chain 78, to the sprocket 79, see Fig. 1, which is on shaft81 of the second feed roller 68. Shaft 81 also carries sprocket which is connected by chain 82 running over idler 88 and driving sprocket 84. Sprocket 84 is mounted in sleeve 85, see Fig. 24, which carries the pinion 86 and also the gear wheel 87. This sleeve 89 carries the stud 91 on which is mounted the gear wheel 92 meshing with pinion 86. On the hub of gear wheel 92 is mounted the friction wheel 93. The housing 89 also carries the stud 94 on which is mounted the pinion 95 which meshes with gear wheel 87. On the hub of pinion 95 is mounted the friction wheel 96. It will thus be seen that sprocket 84 drives through the gears 87 and 95" the high speed friction wheel 96, and, through the gears 86 and 92, the low speed friction wheel 93 (see Fig. 6). Shaft 97 carries the slow-down'feed rollers 64. On this shaft 97 is mounted the friction wheel 98. This friction wheel 98 is adapted to cooper ate with the high speed friction wheel 96, or with the low speed friction wheel 98, dependiru upon the position of housing 89, to give the slow-down feed rollers either a high speed or a low speed. Fig. 6 shows the elements inpositio'n for high speed drive.

The housing 89is given a slight rocking movement to secure this high speed or low speed by the following mechanism.

Referring to Fig. 4, cam 103 mounted on shaft 198 operates cam roller 104 on arm 271,

pivotedat 272, and'connected at its lower end by connectinggrod 27 3 with arm 105 secured to drop roller shaft'270. On shaft 270 is the arm 276, see Fig-l0, at'the lower end of which is attachedthe spring 275. On shaft 270 is also mounted the sleeve 27 7 see Fig. 1, which carries the drop. roller arms 27 1; Onthis sleeve 277 isals'o mounted the arm '278r A spring-279 having one end engaging 278,

andthe other end engaging arm 276; tends to separate said arms, and ad usting screw 280, having-a shoulder engaging arm 278 i and its' end th'readed int'o arm 276, counteracts the said spring tension.= By this means the adjustment betweenarm 105 on shaft 270,

and the drop roller arm 274 on sleeve 277, is secured.

On arm 105' is provided the pin 281, Fig. 7, carrying the blo'ck106, which is seatedin the slot 282 of connecting rod end 283, se-

cured to the connecting rod 100. The other end of" this rod'is secured to the rod-end 284:, provided with the slot 285, see- Figs. 22 and 23, for the end of the stud 94". On connect- .ing rod is provided theheavy compressionspring 99,'one end of which engages the stationary abutment 286. Thefother end en gages the. end piece 284. Alighter tension spring 101 is connected at one-end with the stud 9t and at the other end to the arm 105,

Fig. 5.

When roll'er 1O4 is on the small diameter of cam 1-03, bringing droproller 62in contact with feedroller 63, the block 106 moves to th'eright in slot 282 which permits the spring 99 to force the connecting-rod 100' to from the small diameter of cam 103 arm 105 is moved slightly to the left and block 106 incompressing spring 99 and withdrawing is movedflto the left to engage the end 107 of screw 108, which moves connecting rod 100 to the left in Figs. 1 and 7. This results the rod 10-0 1 away from stud 9 1, as shown in Fig. 23', whereupon the springlOl becomes effective'to rock housing 89 to bring the low speed friction Wheel 93 into engagement with friction wheel 98. a

Itjwill thus be seen that, just as the'sheet enters the slowdowns, the second drop roller releases'its grip, and the sheet takes a reduced speed, (which is thehigh speed ofthe slow-downs), after which, as the-sheet nears thepre'ss guides 120, the slow-downs operate at slow speed. There are two adjustments to time this changeofspeed at exactly the operating, the screw 108is adjusted to get the desired-delivery to thepress guides. Just after the changein speed takes place, and before'the slieetirea'ch'es the press guides, the

to-insure the sheet reaching and," for an instant, being-held against the press guides.

t will be understoodthat thesheet must be against both press guides forthepressto continue in operation. A failure toreach one or both guides-will result in a make-or break contact in a switch,- thus ca'usingthe motor to stop, also the press cylinder willbe tripped and the; brake {applied guides 120 can be seenin Figs; 1-3, 11, Band in 25 and 26. Figs; 25 and 26, being on a largerscale, show clearly the pendulum 122' projecting in the path of [the sheetr, V hen the face 1230f the pendulum'122 projectsibeyond the guide 120 as shown in Figs 13 and 26, the arm 12 1 of the pendulum will close the nozzle 125. This: will result -in* maintaining pressure'on a diaphragm head 126. lVhen however, this face 123 is flush with the guide 120, the escape nozzle 125 will i be open, as shown in Fig-1 1, thus allowing the air to escape from one of the small diaphragms 126 shown in Fig. 15, Sheet 7. The. air feedto the T 127 isfromthepipe-128" through a restricted passage 129 with the escape nozzle-125 at the bottom. The passage 130 leads to one of the diaphr'agms 126 shown-in Fig. 15. Thearea of the escape nozzle 125 is at least double that of the inlet passage 129; the result being, when the nozzle 125 is closed bythe pendulumarm 124; as shown in F 13 the-air pressure will force the diaphragm piston in the position shown Y in Fig.15, the piston rod 131 acting as a .latch'under the trip arm 132 loosely mjounted on-the drop roller shaftrl33. Thisarm can be seen in Figs. 1,3,11,15,19 and'20. In Fig. 1, this arm shows the projecting lug-13 1 p which rests on the top of the spring arm 135;

th'espring arm 135 is secured tothedrop'e roller-shaft 133 in a fixed position. The drop roller is operated through means of a cam arm 136 and cam 137 shown on the upper right'hand corner of Sheet 1. This cam arm 136is rigidly secured'to the drop-roller shaft and is provided with an anti-friction roller, which will follow the actionof the cam 137 at'all times. .Vhenthe drop-roller 17 is up,

The press I Still the trip"a1'm'132- is held slightly clear of the I piston rods 131 shown in Fig.15. In'thisposition of the triparm, thepistons 126 are free to act, therefore when not underair pressure they will be withdrawn-by the helical springs 138. pushing on the reverseside of the piston. It is obvious thatlboth of these piston rods 131 must be withdrawn before the trip arm 132 canfollow the drop-roller down, and when so held up the three-way throw-'out'arm orelement139, see'liiglll,

will be permitted towork; the upper or latchend-140 passing freely under the latch Send being intercepted in order to get a quick action when required;

Note the positionof the cam 141 and the antifriction roller 142 on the portion of the arm 139 projecting to the right. It is obvious the cam action has passed the necessarily slow part of the movement and is fully under way for quick action, when not intercepted by the trip arm. Fig. 20 shows it intercepted, and also shows how the cam will gently engage it at the end of the period and depress it ready for another start. Referring to Figs. 11, 19 and 20, the helical spring 143 pulls this portion of the arm 139 upwardly and in contact with the cam as shown in Fig. 19, except when prevented by the trip arm 132 as shown in Fig. 20. The spring 144, to the left. in the above mentioned figures, is one of the springs pulling the drop roller 47 down; there being two springs in addition to gravity for this purpose. The vertical plunger 145 pivoted on the left branch of the throw-out arm 139 is shownin Fig. 11,111 contact with the pivoted arm 146, buthas not depressed it far enough for action. However in Fig. 19 the plunger 145 is shown fully depressed. WVhen so depressed the door switch contained 1n the casing 147, is operated to make or break con-.

tact, depending on the method of wiring.

This in turn cuts the current from the press motor. The rod 148 which is connected to the arm 146, unlatches well known spring controlled mechanismcommon to this type of press feeder, not shown. One side of this applies the press brake, the other trips the press, so that the type will not come in contact with the cylinder; there being no sheet to receivethe ink from the type. This mechanism may be called the trip box. There are two foot pedals provided for resetting it. The operation is, similar to setting a heavy spring controlled trap, and the above described plunger 145 simply unlatches the double trap. ;The trip box levers are connected to the same brake and trip that are used. when'the press isfed from its regular feed board by hand; both brake and trip being provided with a foot pedal. This arrangement, being common to all makes of flat bed printing presses, is not shown.

Theobject of havingthe press stopped in case a, sheet fails to get squarely against'both press guides is to prevent sheets out of register. getting through without being detected.

With everything properly adjusted, the press run for hours without stopping.

.n starting the press and feeder the operator cuts out the control at the press-guides by means of lever 302, just long enough to present the first sheet to said guides.

After the sheet has been placed squarely against the feeding guides, the sheetis sideguided. There is a side guide on both sides of the delivery for this purpose; only one guide being used at a time. One is selected for printing the first side of the sheet, and the other side guide is used when printing the reverse side; although the reverse side is frequently printed on a different press. In color work the sheet may be printed on one side from three to five times. The edge of the sheet selected for register must be used in all operations. The side guide used in this connection is fully described in my Patent No. 1,466,660, Sept. 4, 1923. This guide is shown in place in Fig. l, but is not shown in detail in these drawings.

After side guiding, the sheet is taken by the grippers in the usual manner; the first turn of the cylinder, printing the sheet as the bed travels with the cylinder, the second turn delivering the sheet as the bed returns, the cylinder then being slightly elevated to permit .the type clearing it. As the sheet is delivcred, it must be stripped from the cylinder. This is all done in the usual way, and is a part of the press operation, and not a feeder operation. However, at this point, it sometimes happens that a sheet will fail to deliver properly, and will crumple up. This is usu ally called achoke up, the sheet remaining jammed between the upper and lower guides. When the press is fed by hand, this will be noticedby the operator, who will stop the press and trip the cylinder, and take the sheet out. WVith a press feeder, it is necessary that the press be stopped automatically in case of a choke at this point, as more sheets coming would increase the jam.

Referring to Figs. 1, 2, 3 and 11, two or more light lingers 171 are provided; the number depending on the size of the press. This much is common to other press feeders. As shown best in Fig. 3, they are immediatelv over the sheet and are parallel with the supporting bars 172 and tapes 173; and are made lpng enough to fully cover the place where a choke is most hkely to occur. These fingers 171 are light and are secured to a shaft 174 journalled at each end. They are prevented from dropping beyond the position shown by an arm .175 secured to the left hand end of this shaft174. This arm 175 rests upon and closes an air nozzle 176. lVhen 1 this nozzle is kept closed the air pressure keeps thediaphragm piston 177 in an elevatedposition, against the spring 177, see Figs, 11 and 12, 16 and 18. The movement of diaphragm piston 177 is communicated gthropgh pistonrod 178 .andlever 179 to lever pivoteda m 1 i lows h heir ,soent,-ofg this. diaphragm pistongand rod oper -..ating. on. lever .146, causes the-,stoppingand itrippipgaofithe press cylinder, through the same. means as t-doesthe action of plunger 145 ,above rer'erred.to jTheairlsupply is ted to the diaphr agm 177 through a restricted pasisethe. same principletas describedlfor the press is -,stopped. The blowerwith its motor are not shown on theserdrawings, as. any. air -supply niay .be used; thewfeeder itself being pneumatically operated. asusual, from the samepp y I ,Eig 17 shows. anozzle 182, similar to. the ,one shown in Fig.16 ;this isnormally closed bya tlatwbar or,plate183pivoted, at 184 near .its center, .Thisbar is controlled by the springt lso. "Theilower end of thisbary183 .serves as a handle. forms. a.supp ortiior the different elements, andis connectedbypipe 187 to the diaphragm 17 7 shown. in Fi s. 11 and 12, this pipe being a branch of-the pipe. connecting the other nozzleshown. in. Fig. .16. Itis obvious if the .noz- 'Zle 'ShQ WH in-Eig. 17 is-opened itwill produce 40 ,the.- same.-results,asdoes opening the nozzle shown in ig. .16. Thepart shown .inFig. 17.-is locatedat aconvenient place at the front of;the.press,--Wherethe operator or pressman can .reach.it .whenexamining sheets as they are delivered in the pile. A, slight pressure ofthe finger on plate or bar 183, opens nozzle 1 82,,and causes a quick. stop of thejpress. and feeder. I

.The. airhose 199,..shown in this figure is ,thesupply' for the feeder, and not thertrips; however the tripsnon the other. side of the "feeder are pipedfrom the same supply.

The tail, clamp, in the present. machine, is similar in construction, adjustment and con- ,trol, to thatshown in, Figs. 1, 9 and. 10' of my..Patent- No. 1,412,872, of Apr. :18, 1922. The drag however, in accordance with. the present invention, is incorporated. with the .tailclamp structure, asshowniriFig. 2. ,.,This

-6'0 construction is made thesubject of a. separate application andgneed not be described in detail in this application.

Figs. 25 and 26 show the press feedlng guide as used with this feeder, drawn full 05 size. In addition to the trip pendulum 122- press, guides however the .escapepassage is a geonsiderablylarger relative to the restricted passage. The reason for the escapenozzle ;,beinglarger'relativelpis.to get a veryquick In the I caseofthe small pistons,

The .body portion .186

.13 18111 the form of a. T hav ngthree nozzles.

incorporatedin it, thereis an improvement in the guides over the sheet. This is de-. sirable .in connection with a press feeder, as the two very small rods 239 over the sheet can be adjusted to, bring them very close to the plate 237 below thesheet and made parallel withit. This plate or spring287, shown in elevation in 26, is just above the periphery of the press cylinder 238. It also is shown in section in Fig. 25. It. is a regular part. of the press. ,This plate is sprung .in position, up against the heavy plate 236 forming the lower part of the regular. press feed board. .VVhen the press guides 120 come down on these spring plates 237 they depress them slightly thus forming a close contact.

Thesmall round rods 239 having substantially horizontal and vertical extensions with a coil between said extensions are also sprung in place, the front end .is under the press guide 120 and firmagainstit, there being a notch cut in the guide. The depth of this notch isslightly more than the flattened end of the rod 239; this fixes the space for the sheet at thisend. The other end can be elevated or depressed through means of the small nut 240 at the top of the'ro'd and hearing against the yoke or supporting frame 241 through which the rods;.239 project. When properly adjusted-these .rods 239 insure the.

sheetbeing kept flat and straight, at this vital-point. I

,The nozzle forrnation 127 {shownin Fig.

One arnrof-the T is detachably secured,in

,theiyokeor frame 241 by meansof the spring .241 engaging in a notch .provided in, said arm. 7

l/Vhat I claim is H I 1. In a sheet feeding 1 machine, a pneu-- .matically .operated controlling system, in-

cluding air escapeinozzles and automatic controls for same: andfan additional nozzlev .for arbitrary control, hav ng a normally spring controlled element for manual operation.

2. In combination-with a sheet feeding machine, a press feed1n g. guide having a vertically extending portion, w1th a notch in its lower edge, and ahorizontal rod .posi- C tioned above thepath of travel of thesheet, having ts end engaging the upper margin lower edge, and a horizontal rod adjustably positioned above the path of travel of the sheet, having its end engaging the upper marginotsaid notch.

.4. In combination with a sheet feeding machine, a press. feeding guide,- comprising a vertically extending portion withranotch inlits lower edge. and a springzelementhaving a verticaland ahorizontalr(extensionwith an intermediate coil, the free end of the horizontal extension engaging said notch and the vertical extension having vertical adjustment.

5. In combination with a sheet feeding machine, a press feeding guide comprising a supporting frame and a vertically extending portion provided with a slot and flankin g notches in its lower end, an air escape nozzle associated with the frame, a pivotally mounted nozzle controlling element having a portionmovable in the slot, and horizontally extending resiliently supported rods flanking said pivotal element with their free ends engaging in said notches.

6. In combination with a sheet feeding machine, a press feeding guide comprising a supporting frame and a vertically extending portion provided with a slot and flanking notches in its lower end, an air escape 11ozzle associated with the frame, a pivotally mounted nozzle controlling element and having a portion movable in the slot, horizontally extendingresiliently supported rods flanking said pivotal element with their free ends engaging in said notches, and means for "securing vertical adjustment of said rods.

. 7. In combination with a sheet feeding machine, a press feeding guidecomprising a supporting frame and a vertically extending portion provided with a slot and flanking notches in its lower end, an air escape nozzle associated with the frame, a pivotally mounted, nozzle controlling element having a portion movable in the slot, and spring rods having horizontal and vertical extensions, the ends of the horizontal extensions engaging said notches and the ends of the vertical extensions adjustably secured.

8. In combination with a sheet feeding machine, a press feeding guide, comprising a supporting frame and a vertically extending portion provided with a slot and flanking notches in itslower end, an air escape nozzle associatedwith the frame, a pivotally mounted nozzle controlling element having a portion movable in the slot, a guide plate in spring engagement with the lower edge of said vertically extending portion, and horizontally extending resiliently supported rods flanking said pivoted element and spaced above said guide plate with their free ends engaging said notches.

9.. In asheet feeding machine, pneumatic controlling means, including a three nozzle formation, a supporting element therefor and resilient means for disengageably securing said nozzle formation to the supporting element.

10. In a sheet feeding machine, pneumatic controlling means including a supporting element, a nozzleformation in the form of a T having three nozzles, one arm of the T adaptedto be disengageably secured in the supporting element, and provided. with 21 ress uide and extensions located above and parallel with the plane of travel of the sheet and flanking the sheet engaging portion of the pendulum.

12. In a sheet feeding machine having a pneumatic control system, a self-containing structure comprising a press guide, a nozzle formation, a pivotally mounted pendulum having a nozzle controlling portion and a sheet engaging portion normally at rest in advance of the sheet engaging face of the 3 press guide, and resilientextensions located above and parallel with the plane of travel of the sheet and flanking the sheet engaging portion of the pendulum.

13. In a sheet feeding machine having a pneumatic control system, a self-containing structure comprising a press guide, a nozzle formation, a pivotally mounted pendulum having a nozzle controlling portion and a sheet engaging portion normally at rest in advance of the sheet engaging face of the press guide, and vertically adjustable extensions located above and parallel with the plane of travel of the sheet and flanking the sheet engaging portion of the pendulum.

14. In a sheet feeding machine having a pneumatic control system, a self-containing structure comprising a press guide, a nozzle formation, a pivotally mounted pendulum having a nozzle controlling portion and a sheet engaging portion normally at rest in advance of the sheet engaging face of the press guide, and extensions located above and parallel with the plane of travel of the sheet and flanking the sheet engaging portion of the pendulum, the free ends of said extensions projecting into notches formed in'the lower edge of the press guide.

15. In combination with a sheet feeding machine, means for automatically stopping the machine in case of a choke, comprising pneumatically operated controlling means having an air escape nozzle connected therewith, a rock shaft provided with an arm normally resting by gravity upon and closing the air escape nozzle, a plurality of fingers mounted upon said rock shaft, supported above the delivered sheet by the nozzle closing arm and adapted to actuate the nozzle closing arm upon abnormal conditions.

HOWARD K. KING.

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