US993612A - Printing-machine. - Google Patents

Description

L. E. MORRISON. PRINTING 111110111113. APPLICATION FILLED JAN. 2, 190

Patented May 30,1911.

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A TTORNE Y L. E. MORRISON. PRINTING MACHINE.

APPLICATION FILED JAILZ, 1907.

Patented May 30, 19-11.

' WITNESS/5? dd 2/ I fWMAWK lNVENTO/i B) V i Arron/Er L. E. MORRISON. PRINTING MACHINE.

APPLIUATION FILED JAN. 2, 1907.

Patented May 30, 1911.

a SHEETS-SHEET a.

/// a m to zZM' 2 WWW 1mm 0% zmgiiw- WITNESSES A TTOHNEY L. E. MORRISON.

PRINTING MACHINE.

APPLICATION FILED 1mm, 1907.

Patented May 30, 1911.

8 BHEETS-BHEET 4,

EMMI/ lNVE/VTOR' ATTORNEY Patented May 30, 1911,

B SHEETS-SHEET 5.

LL B. mofmison. I

PRINTING MAGHINB. APPHIGATION EILEIJ 1.9.11.2, 1307.

mmea' May 30,1911.

8 SHEETS-SHEET 6.

s sunburn Patented May 30, 1911-.

L. E. MORRISON.

PRINTING MACHINE.

APPLICATION FILED JAN.2, 190-1.

L. E. MORRISON. PRINTING MACHINE. APPLIQATTON FILED un z leorz.

Patented May 30 s sums-sum a.

UNITED STATES PATENT OFFICE.

LEWIS E. MORRISON, 0F NEWARK, NEW JERSEY, ASSIGNOR TO AUTOMATIC PLA'IEN PRESS COMPANY, OF NEW YORK, N. Y., A

PRIN TIN G- MACHIN E.

To all whom it may concern:

Be it known that I, Lnwis E. MonnIsoN, a citizen of the United States of America, and a resident of the city of Newark, county of Essex, State of New Jersey, have invented certain new and useful Improvements in PrintingMachines, of which the following is a specification.

This invention relates to printing machines and has more particularly reference to the type known as an automatic platen printing press.

' The object of the invention is to produce a machine of this character embodying novel and useful features for the purpose of reducing the size and number of parts and to improve'the general construction so that the machine may be operated at high s eed and all parts be easily accessible for c eaning, etc.

Hence 'the invention comprises such elements, arts and mechanisms as will be hereina ter described and illustrated in the accompanying drawin s, while the novel features will be pointe out in the claims.

In the said drawings: Figure l is a side elevation of an automatic platen printing press embodying my invention, with the impression on. Fig. 2 is a similar view with the impression off and details left out. Fig. 3 is view looking in the directionof arrow 3, Fig. 1. Fig. 4 is a plan view with nuts removed. Fig. 5 is a side elevation o the sheet separating, feeding and registering -mechanis1ns. Fig. 6 is a plan view of Fig.

5, parts being broken. Figs. 7, S and 9. are

detail views of the separating mechanism.

Fig. 10 is a detail view of the register stop. Fig. 11 is'a' view of the register stop bar. Fig. 12 is a? side elevation of the gripping mechanism.- Fig. 13 is a detail'viewof member 1s rigidly mounted, while theother parts shown in Fig. 12. F ig. 14 is a detail view of the ripper. jaws. 15 is a de tail viewof the sheet supporting means shown in Figw12. Figs. 16 and 17 are detail views .of the delivery grippers. Fig. 18 is a sectional view on line 1S18'of Fig. 19 through'the form carrying member illustrating parts of the inking mechanism. Fig.

19 is a view on line 1919 of Fig. 18. 20- is a plan view of parts of Fig. 19. Figs.

Specification of Letters Patent.

Application filed January 2, 1907.

Fig. 23 is a view 21 and 22 are detail views.

CORPORATION OF NEW JERSEY.

Patented May 30, 1911. Serial No. 350,516.

on line 2323 of Fig. 22. Figs. 2-1; and 25 show side and front views of the tripping mechanism respectively. Fig. 26 is a plan view of parts shown in Fig.25.

I pause here to remark that many details are necessarily left out ,of the first four figures so as to not complicate the general views of the machine.

Referring now in a general way to the first four views it will be seen that the va nous elements of the machine are supported by a framework comprising the two side frames 1 and 2 braced by a cross piece 3 and the platen beam 4 at the bottom and top respectively. The platen beam is provided with a depending portion 5 havin shoulders 6 on which rests the stationary horizontal platen 7, which is provided with grooves 8 for the said shoulders, so that the platen may be readily removed by sliding, and the platen beam, hence the platen, is vertically adjustable by means of the bolts 9 and 10.

Cot perating with the platen is the form carrying member 11 carrying the form 12. which is adapted to slide into and out of position on the said member and may be fastened by any suitable means. The mem-. ber 11 is in the form of a cylinder part of which is cut away to accommodate the form and the remaining cylindrical surface is utilized as ink distributing surface as will be pointed out later on.

v The form carrying member is adapted to oscillate toward and away from the platen as usual and the means employed in this instance are as follows. On the main shaft 13 is mounted a crank disk 14: carrying the link 15 to which is connected the to gle links 16 and 17, one of which is pivoted on the shaft 18 upon-whichthe form carrying link is pivoted on the eccentric shaft 19. The crank disk is rotated bymeans of the gear 20 meshing with pinion 21 on shaft 22, to which power for the machinemay be applied in any suitable and convenient manner. In order to guide the form carrying member during oscillations the shaft- 18 is rigidly fixed in the arm 23 which is pivoted onthe shaft 24 in the frame. The axis of the shaft 24 is substantially on a level with the underside of the laten, as shown. Oneimprcssion is obtaine to each one revolution of the shaft 13 and the two extreme'positions of the form are clearly illustrated in Figs. 1 and 2 with the other parts of the machine in their corresponding extreme positions.

I will now describe the various mechanisms in the order in which they act for progressing asheet through the machine.

Sheet feeding and separating mecham;sm.-'Referring now' to Figs. 5 to 9 the f-eference numeral indicates a box or car-" riage adapted to reciprocate by means later to be described. The said carriage .forms a rcce tacle for the sheets 26. Adjustable side pipes open gui es as 27 and a rear. guide 28 are provided and the latter carries two hooks or fingers-I29 for the support of the rear-edges of 'the; sheets. The carriage travels in r' dv ;:30 -in theside frames 31 which-are suitably; braced and form the. framework for thef-fe'eding and separating mechanism 'and'are in turn mounted fast on the sta-. tionary' shaft 24, Betweensaid side frames 31 are ivoted a 'lurality of smooth rollers 32., pre erably of. ard wood, which are free to rotate. The sheets-restdirectly on these rollers, so that when the"ca'rriage containing thesheet is reciproc'ated the rollers turn, freely under the sheets in the same direction as the carriage travels. In this manner the sheets are moved with the least amount of friction and 'iwithout being subject to jars and shocks. In order to allow for the pas-' sage of the hooks 29 the rollers are grooved as at 33. One of said rollers, that deslgnated as '34.- carries the suction means-for separating-the bottom sheet from the pile. The said roller is provided with a plurality ofgrooves 35 in which rest the branches 36 of the suction pipe 37, in such a man'ner that they form no obstruction to the travel of the sheets and are adapted to oscillate in the grooves. The openends 38 of said branch directly upward under the sheets. To. the one end of the main pipe 3.?isattached the hose 38', the other end of which is-eoiinected to the pump 39. (Fig. 1.- The means for operatin the.pum .isnot shown. so asnot-tofcomp ica-te this drawing and it is obvious that the ,same may be op erated in any suitable manner,-say-by cam and roll for instance, from any -one-revolu-' tion shaft 'on the machine.) The .other end of the main pipe isTlos-ed bya rod40 which extends outwardly through the side frame, outside of which it is attached to a bell crank 41 pivoted on a stud 42 concentric with the axis ofthe roller, 34 so that when said bell crank is rocked the branch'pipes. oscillate in their ooves. This is easily understood from Figs. 7, 8 and 9.. A spring t4 keeps the'main pipe in its lowest position and the openings of the branch pipes directly above the center of the roller. The means 'for rocking said bell crank consists of a long cam 45 on the carriage.

The operation of separating the bottom sheet is as follows: The ile of sheets .is placed on the carriage'anii properly positioned by means of the guides so that the leading edges of the sheetsrest directly over the openings 38 of the branch pipes 36. The moment the carriage is pulled forwardthe suctionis applied which separates the bottom sheet, which then turns over around roller 34; as the cam 45 rocks the bell crank L1, and the sheet is delivered in the gap of the two guides or feed rolls &6 and 47, the suction ceases now of course and the sheet passes out between the feed rollers,

while the carriage travels forward, th leadmg. edges riding upon the separating lip 48 which may be supported on a transverse rod or otherwise. Having'reached the end of its travel the carriage then returns to its initial position which allows the bell crank to clear thecam and assume the first position with the suction mechanism ready for the next sheet.- The guide roller .46 is driven constantly in a forward direction by means of the pinion, 4:9 meshing with gear- 50 which rotates freely on shaft 24. The sheet passes now onto the registering mechanism.

Registering mecIuzn'ia11t.'-In constructing the registering mechanism the object has been to com ose it of as fewparts as possible and particu arly to do away with-the ob jections relating to delicate and complicated means forside register,-which easily get out of order,and. cannot; be depended on. Referring to- Figs. 5 and 6. 51 indicate side. frames carried by the bracket 52 supported b and adapted to turn on the bracket 53 bolte to the main frame. A bolt 54 acts as a pivotfor the bracket 52 and frames 51.

Between said frames aremounted a plurality of smooth. rollers 55, preferably of hard wood. Outside the frames on the one side the rollers carryfriction rollers (or gears) 56, .which mesh with. the intermediate friction rollers. (or gears) 57. The central roller 58' carries in addition a pinion 59 which meshes with a gear 60 on shaft 61, which in the center carries the pulley 62, which is driven by belt 63 from pulley 64 on the main shaft. (Fig. 1.) By these means the rollers. are driven constantly and rapidly in a forward direction o'nly., Adjustable side registering tguides as 65, one for each side, are rovide 1 en it .isdesired-to register say to the right, the bracket 52- carrying the side frames in which the rollers are mounted, and which I shall here and in the claims properly call the registeringtable, is turned on the bolt 5t into the osition-shown in- Fi' 6 and secured by the ock nuts 66.. .The rig t side guide is adjusted and the sheet .passing out through the-guide'rollers 46 and 47 is carried on'thg rollers 55 and iscrowded toward the side goldeonto the plate 67 and againstthe register stop or stop bar 68. It will now be understood that the driving power forthe "rollers 55 must be supplied in the center of the'table. The slight twist to the right or leftdoes not of course offer any obstruction to the transmission of power from the main shaft to the shaft. 61. This means of transferring the sheet and side registering it has been found highly efficient and can be changed from right to left side i f re ister'in a moment.

he stop bar 68, Figs. and 11 carries (adjustable stops 69 and is mounted upon. the

izvoted levers 70, only one is shown, which 1s oscillated through the instrumentality of grippers.

theforkedlink 7 2 carrying roll 73 acting on -cain 74. on main shaft 13, which cam' is so .constructed and timed thatthe stops will be quickly withdrawn to make room for the The carriage '25 is connected to the arm 74 bythe link '75. Arm 74 is fast on rock shaft 76, which is rocked by means of the levers 77,78, which latter carries a roll 79"coacting with the cam 80. In this manner the carriage is reciprocated and the arm 74 is slotted as. at 81 to allow of an i sheets handle l The grl pers as man 40" ii adjustment of the stroke and of the travel of the carriage according to the length i In this manner the s eet separated, fed and registered. Next the sheet is seized b the grigping mechanism.

am'smrjaws'normally'closed; The shaft 81 is car- .89.. It is of importance to note, that the ing point 0 ried by-two bell cranks 86 one on either side,

the said bell cranks are pivoted at 87 on the carriages 88, which reciprocate: on the rails axis of the pivot 87 is in line with the closthe grippers, so that this point always moves parallel to the surface of the platen, thereby leading the sheet in a straight plane under the platen. In other gripper shaft is a rod 92 the gripper jaws. That part 93 of n words we have here -a straight line gripper motion.

bythe spring 91. Thus the grippers are guided at two. points.

Parallel to and'sui tween the rod passing between'the jaws is of The other end of the bell crank 86 carries a roll 90 kept'up against the rail tably supported the which passes bespring". keepsthe grippers closed.

t'angular crosssection, and at oneend a lever 94 is rigidly attached to the rod and carries a roll 95. A ,cam 96 is provided which, when it descends engages the roll. on

the lever 94 thereby rocking the rod 92,

which rectangular portion forces the grippers apart. 1

.At the right in the drawingt'he grip ers are shown dotted and the rail here isnt as at 97. At this point the spring ulls the bell crank upward as shown, thus ringing the gripper out of )zne way of the deliyery mechanism.

Preferably the parts are so arranged that the cam 96 descends. when the grippers are at the end of the forward stroke .in timeto open them anddz'ree the sheet, the cam may then remain down while the grippers move toward the next) sheet and when the same".

is inside "the jaws the cam will ascend and the grippers close on the sheet." k

i The cam ispivoted at two points 99 to the one end of. two bell cranks 98 pivoted at 100. The other ends are connected by means of a link 101. Thebell'cranks are rocked, tllagtis cam operated, by means of hell crank pivoted at 103 and connected to the one bell crank 98 by link 10 1 and operated by meansjof link 105 carrying cam roll 106 acting oncam 107 on shaft 108. This shaft is driven from the main shaft by means of;

bevel gears109, 110, 111, and 112 as seen in Figs. 1, 2, 3- and 4.

The carriages 88 are operated from rock shaft 76 by means of links 113 and 114.

'See Figs. 1 and 2.

Means are provided for supporting the 1 sheet. as it passes under the platen and also hold the rear edge against the same while it is being printed. These means may take the following form. A brush 115 which may be constructed in any convenient manner of any suitable yielding material and of which one mode of construction is shown in detail in Fig. 15 is pivoted on the shaft 116, which also carries the levers 70, this brushbeing rocked upwardly against the platen as soon as the leading edge of the sheet has passed under the same and the sheet is drawn by the grippers between the platen and the brush. See Fig. 12. The brush is operated by means of link117 carrying roll 118 acting on cam 119, see Figs. 1 and 2. While the sheet is being held by the'grippersand the brush, the rm carrying members move up and the sheet is printedand is then seized by the delivery grippers.

Deli very grippers. See Figs. 1, 2, 4, 16

and 17 .--The delivery grippers. comprise twogripper jaws l20 and 121; The lower one 121 is mounted rigidly .on the shaft; 122,

while thenpper one is carried by a bar 123. The shaft 'is pivoted in two-swin 'ng arms 124. to which the bar .123 is fixe and '31:

- Also already stated the form carrying memv the slotted.crankj139"on shaft-.108.

the length of the-stroke of the rack hence the swing of the arms 124 may be adjusted,

'ai'in 126 carries f'a cam. roll 127 which alternatelengages .theflu per lixed and lower mova le cams 12 8' an 129. The upper cam serves to free-*gthe 'sheet and thesame may in' thex-rece tacle.

be dropged ig. 2. When the ower movab e cam printed side, 11 130, see l 129 .e ngages the M11 127, the ip ers open to seize the sheet from under t e paten. The cam 129 is pivoted at 131, see' 'Fi'g. .2,

and operated by means of link 1 2.1 I .eam.

133 and. cam-134. H

The swinging arms 124 are pivoted on shaft 135 a apted to oscillate b means of gear 136 engaging the rack 13;,

operated by means of link -138 connected to,

. which is important, as it"sometimes' is-des'irable to deliver the sheet printed side down,

when it will be deposited in the receptacle 140,- see' Fig. 2' dotted lines, while the clam 128of'course will bemoved down a corresponding distance or another. cam, put on for this purpose.

I will now describe how ink 'isapplied to the form. v

inking mechanismE-In platen presses it has heretofore been the custom to have the inking rollers, which pass over the form, re-. ciprocate.

This" necessitates a construction in which the niove'mentof the form was large enou h and slow enough to allow of the said ro lers' to pass" over the form twice.

I provide an inking mechanism in which the distributing rolls rotate and passover the form but once to each impression, hence I am able to shorten the stroke of the form carrying member, thereby running my press. at high speed. Moreover, I provide a greater.

number of ink rollers and a large ink distributing surface, whereby it is possible to do finer work on the press. v

' The inking mechanism is'illustrated in detail in Figs. 18 to 23, see also Figs. 1 and 4.

ber 11 is in the form of a cylinder with a part cut away to accommodate the form and is mounted fast on the shaft 18. A plurality of distributing rollers 141 are provided as is also means for rotating the said rollers,

around the form carrying member and guide them thereon. On the shaft 18 is rotatably mounted oneither side a gear 142 which is drivenconstantlyin one direction by a train of gears as '143,"144,--'50, 145 meshingwith gear 20- on crank disk 14. Gears 145 turn freely on a stud infjth'e frame, while gears 143 and 144 are carried by studs in the swinging arm 23. Thus these and rotate while the-arms 2.3 0501 late. The gears 142 are provided with a thickened portionas at 146. and in the saidportion is cut [as many vT-slots 147 as there are inking rollers and into said slotsthe bearing pieeejs which is- Thus ears mesh I for'the shafts of the'ink rollersarev dropped. The; inking rollers with adj acent-parts are all a one ro like, and I will therefore only describe fstwo guide rolls 149 "which run surface and the track takes the overflow.

The rollrshaft 148 ismounteddn' bearings-- 152 which are held "by 'the*aifores'aid slots 147 and ada ted'to slide therein. "The'beai's in 152 are fitted .with a loose piece 153' he d in place by; pin 1.5 4 and'sp'ring1155 vworking against the plug 1'56 andacamroll 157'ismounted in said piece- Said cam roll engages the inside cam 158. It will'thus be seen, that asthe gea'rs'142 rotat'e, the inking rolls are carried around the form member and the form itself and" are. kept againsfl'it ,by reasonof the 'cam rolls 157 and cam 15.8.

The sp .155 compensates. for any slight "wear of t eparts. ,The ink is put on the surface of the form member by a ductor roll 159, which is carried by the lever 160 piv oted on'the frame and provided with a cam roll 161 enga 'n the earn 162;. The doctor takes itssupp y omonc or more ink rollers as 163. 164 mdicates the ink fountain. .One

of the ink rollers 166 is driven from the gear 167. As pointed out. this inking mecha nism has the advantage .of providin -{a greater number of ink-distributing ro'l ers,

a large amount of inking surface, hence a. a

more even and smooth distribution than would be possible if the rollers reciprocated, and the inovementof the form: ca member can .be made very short and "rapi another great advantage. v

The cam 158 is splined tothe shaft so that it may easily be slid away from the cam rolls thereby making removal of the inking rollers easy for cleaning, etc.

- From the foregoing it will clear that the form carrying member with its-adjacent.

parts and the guide arms with the train of: gears altogether represent .quite a weight, which, of course requires considerable power to move quickly by means of the crankdisk and its connection to the toggle links. In order to relieve this mechanism of itswei ht and operate these parts as fast as possi 1e and to get the full eifect'of the so-called squeeze in the moment of impression, I have provided a counterbalance of novel and simple design. The mainfeature of this is that I counterbalance the total weight of the above mentioned parts by. means'of the m. The. shaft 148 of each inking 70.

on 150 one on either end of theforin" ca' .g-inember 11. -A slight'annular depression 151 between the inkdistributing' natural pressure of the atmosphere, aj'con- I struction and design which I believe 'to' be wholly new. An inspection of the first four figures shows that on top of the platen beam and directly over the center of the shaft 18 in the arms 23 are mounted two cylinders .1.68 in which move airtight 169,

the rods of which are connected by links 170. to the arms 23 at 171. The links 170 pass through openings 170 in the platen cam 4, see Fig. 3. The air in the cylinders above the pistons is exhausted leaving a perfect vacuum, and the diameter of the pistons is so calculated that the atmospheric pressure on the underside of the two pistons equal the total weight of the aforesaid moving' parts. 'As this pressure acts upon the pistons at all times it will be seen that a erfect counterbalance has been produced y very sim 1e but effective means. The advanta e 0 this device is of course a gain in rapi ity of operation, less wear on the moving parts, absenceof noise and a better impression. As stated, I believe this method of counterbalancing to be broadly. new, and it may. of course be used in other kinds of machines.

It now remains to describe the means for tripping the impression member, when a sheet misses.

Tripping mchanism.-Referring to Fi 24, 25 and 26 .it will be seen that a lever 1- 2 is pivoted on the arm 2 3'at 173 and carries a hook 174. Around the eccentric shaft 19 passes a flexible connection or chain 17 1 which is fast on said shaft at 175 and to which is attached a rod 176 terminating in a hook 177 Normally these two hookscannot engage. Means however are provided, whereby when a sheet fails to reach the sto bar 68, the two hooks engage on the upwar stroke of the form carrying member, with the result that the shaft 19 is turned around its eccentric center 178 by means of the chain, consequently the center around which the lower toggle link moves is, shifted downso that the 1m ression member, upon the straightening 0 said toggle links, is prevented from reachin the platen or is tripped. The form will stop a slight dis- ,tance beneath the platen, sufiicient to prevent the latter from being inked. The eccentric shaft 19 also carries a collar 179 to which is attached the lever 180, which carries a cam roll 181 co-acting with the cam 182 on main shaft 13. Normally of course this lever remains immovable, while the cam rotates with the shaft. When, however, the

shaft 19 has been turned over, as stated, the said lever is pulled down, so that the cam roll 181 will engage the cam 182 on the re: turn stroke of the form. When this hapus the cam lifts the roll and also the lever 180 back to position shown in Fig. 24; and

the lever consequently turns the shaft 19 over into its normal position and on the next up stroke of the form the same will print,

supposing of course, that on the next revolution of the machine a sheetis'readyto be acted upon. This, in short,' is how the form member is tripped. A's stated,, means are provided, for causing this result or in other:

words for causing the two hooks to engage. .Said means may be of variousconstructions, but in the present instance they take the following forms. Pivoted at 182*on the arm 23 is a lever, the one end of which is attached to the aforesaid hook lever 172, while the other end terminates in a fork- 183 in which moves the vertical rod 184. This rod engages two stops 193 and 194 on said rod.

On rockshaft 76 is mounted a loose collar lar is positioned between two collars fast on the-rockshaft, one of which 197 has a pill 198 engagin" said groove 196. The loose collar is furt er provided with a weight 199 and an arm 200 to which a member 201 is connected by means of a cord 202. This member 201 is for the urpose of detecting whether or not a sheet 15 ready on the plate 67 to be seized by the grippers. The operation of these 'parts is as follows: A sheet is fed onto the-plate 67, and the member 201 descends and rests on said sheet on the downstroke of the arms 23, and at the same time the-reciprocating member 185 moves toward said detecting member 201 and passes through its opening 203, the projection 192 having engaged lower collar 194 on rod 190 thus throwing arm 186 inwardly. On the upstroke the member 185 is moved outwardly in time 'to swing the hook 174: out-of the way of hook '177'through the connections above described, and the form member will not be tripped. I pause here to remark, that the "farm 186 will fall by'its own weight to either side as soon as it is brought past the center. -The reason for this will presently appear. If on the downstroke of the arm 23 no sheet. is on the plate 67, the descending member- 201 passes through the opening in said plate, so that, when the reciprocating memher 185 moves inwardly 1t cannot pass through the opening 203 but abuts the side of member 201 and is held, there firmly by the weight of the am 186. This means, that the hook'174: is kept out-1n; the'way of hook .177 and the form memberis tripped. While the detecting membenis-held down by the member 185 the rockshaft 76 has of course not ceased its motion hence the fast collars also rock and the pin 198 travels-idly backward in the groove 196. Hence the reason for this construction. As soon, howthe hook 174. The member.

195 having a circular groove 196. This 001- ever, as the form has-been tripped and is turn only has the weight of the arm 186.

supply. Vvhile the invention is shown in concrete ready for the next stroke with a sheet getting into placeand the reciprocating'memher 185 has relea ed member 201 the weight 199 pulls the-latter upward and out of the way ready for the next move. A stop 205 limits the outward move of member 185.

Now the dilference of this tripping mechanism from other existing constructions can be pointed out and its advantages understood. In most other tripping mechanisms the detecting member 201 or its equivalent acts to actuate the trip directly. This is not desirable, however, inasmuch as this member naturally is of very little strength and finely constructed in order to register the absence or presence of a sheet. In my construction this member acts as a stop only for the reciprocating member 185, which in behind it. So that we'here have-a tripping mechanism actuated directly by the form carrying member, but which mechanism does not act until the detecting member permits it. Hence all the parts may be made strong and'substa ntially without fear of them getting out of order. It is also worth notmg "that the tripping is not effective suddenly it with a jar, but that the to gle links simply are straightened out at a di erent point'than u that when not tripping without changing the speed of the machine.

It is thought that the foregoing describes and illustrates my invention clearly. Many mechanical details have been omitted such ns brackets or guides for the different re- C-i proca'ti'ng parts, or springs for keeping the clilferent" cam rolls on their cams, etc, which parts those skilled in the art could easily form, it is obvious that changes may beeffected inthe various elements without departing" from t-liescope of the invention: Hence I claim all such changes and variations as will come within the legitimate intions between the latter and the said swingihgs arms so arranged-that the atmospheric pressure on the one side of said pistons counterbalances the weight of said arms and said form member.

2. The combination of a pair of swinging arms, a form member supported thereby, a pair of vertically supported cylinders havin their lower ends open, pistons in said cy 'nders from which theair has been ex 'hausted above said pistons, "connections between the said arms and the said pistons arranged that the atmospheric pressure on the underside of said pistons counterbal- "ances the weight of said arms and said form the said cy inders, pistons in the latter 'having their lower surface exposed to the atmospheric pressure and moving air tight in the cylinders, and. connections between thesaid pistons and the said form member passing through the said platen beam openm 4'. The combination of side frames, a platen beam supported horizontally between said frames, a platen supported on the under side of the said beam, arms pivoted in the said frames at the, same level as the underside of the platen, a form member rigidly supported in the free ends of the said arms, a driving shaft, toggle links interposed between the said form member and the said frames and operating connections between the saidtoggle links and the said driving Shaft for oscillating the said arms.

5. The combination of a platen, a form member, gears journaled at either end of the said form member, inking rollers journaled in the said gears, swinging arm sup porting the said form member, gears anu ink rollers, a counterbalancing device mounted above said platen and operating connections between the. said device and the said swinging arms and means for oscillating the latter.

6. The combination of a platen support, a platen, a gripper mechanism, means for reciprocating the latter below the platen, a shaft supported on the said platen support and .below, the impression surface of the platen, a resilient brush member carried on the said shaft and adapted to support the rear edge of a sheet against the platen and means for operating the said'brush member.

7. The combination of a horizontal platen, a feeding gripper mechanism adapted to reciprocate below the platen, means for operating said mechanism, a shaft secured in front of the said platen, an elastic brush member on said shaft and means for oscillating the said brush member to support a sheet as the latter is carried under the platen by the said gripping-mechanism.

8. The combination of a platen support, a platen, a form member, operating means for the latter, a counterbalancmg device mt above the said platen support, operating conand-operating connections for oscillating the said two rockshafts from the first named operatin means.

Signe at New York t 190m v LEWIS E. MORRISON.

Witnesses: r

- IVAN KoNmseEnG, G120. A. MAnsHAL .L.

1o 11;"531 day oiDec.

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