US1828298A

US1828298A - Stenciling machine

Info

Publication number: US1828298A
Application number: US345780A
Authority: US
Inventors: Jr James E Shaver
Original assignee: Underwood Elliott Fisher Co
Current assignee: Underwood Elliott Fisher Co
Priority date: 1929-03-09
Filing date: 1929-03-09
Publication date: 1931-10-20
Anticipated expiration: 1948-10-20

Description

Oct. 20, 1931. ,1 E. sHAvER, JR

STENGI'LING MACHINE Filed March 9. 1929 2 Sheets-Sheet 1 061.'. 20, 1931. -1 E, SHAVER, JR 1,828,298

STENCILING MACHINE Filed March 9. 1929 2 sheets-sheet '2 Patented Oct. 29, 1931 UNITED STATES PATENT OFFICE JAMES E. SHAVER, JR., OF PHILADELPHIA, PENNSYLVANIA, ASSIGN'OR TO 'UNDER- WOOD ELLIOTT FISI-IER- COM'PANY, OF NEVI YORK, N. Y., Av CORPORATION OF DELA- l mechanism.

WARE

STENGILING MACHINE Application filed March 9,

The present invention relates generally to rotary duplicating machines of the class Where 'a perforated cylinder carries an inked stencil-sheet arranged to be brought into rolling contact with the Work-sheet ted to stenciling position, as determined by engagement of the stencil-cylinder and a platen-roller, and more particularly to such machines equipped with auxiliary Worksheet-feeding Certain features of the present invention may be advantageously applied to a duplicating machineof the kind disclosed in the -co-pending application of Linden A. Thatcher, Serial No. 334,157, filed January 22, 1929, now Patent 1,788,782, Jan. 13, 1931, but other features may be used With other types of duplicating machines, and with printing machines.

As employed'insaid application, the stenf cil-cylinder Was continuously rotated and the auxiliary feeding mechanism was arranged for feeding a Work-sheet from a preliminary position, in a predetermined time relation, to the cylinder While it Was rotated at full speed. It has been found that in doing certain kinds of stencil-Work such as for example, when stencil-characters are required to be very accurately positioned on previously- 'printed forms, it is preferable to stop the lstencil-cylinder and secure moi'e accurate registration of the Work-sheets iiiser ing them directly to stenciling position between the stationary cylinder and the platen-roller.

An importanteature o the present invention resides in the provision of a duplicating' machine which can be set for having Worksheets rapidly fed to its stencil-cylinder While the latter is continuously rotated; and Which can also be set to have its stencil-cylinder autoinatically stopped after each Work-sheet is stenciled, and to vhave other parts of the machine co-operatingly arranged whereby Work-sheets may be manually and accurately inserted directly to stenciling position.

To carry out this feature of changing the Work-condition of the duplicating or stenciling machine, a. stop-member for arresting the rotation of the stencil-cylinder is displace! ably mounted on the machine, and a handlecarryingcontrol-device is operatively con- 1929. Serial No. 345,780.

nected to the stop-member, whereby the liandle, when set in one position, leaves the stop ineective to arrest ythe rotation of the stencil-cylinder, and when moved to another position makes'the stop effective for arresting the rotation of the cylinder after each Work-v sheet is stenciled. An operative connection is provided between the handle and the Worksheet leading-edge gage-pins of the auxiliary Work-sheet feeding and timing mechanism, which is eifective to remove the gage-pins from the path' of the Work-sheets and lock them in a disabled position simultaneously upon moving the stencil-cylinder stop to et'- fective position. A Work-sheet may then be inserted past the auxiliary Worksheet-feeding mechanism to stenciling position.

It is proposed to make the stencil-cylinder and other relatively large parts of the machine out of an aluminum alloy to secure a light and portable stenciling machine; and a feature of the present invention resides in the provision of means for mounting a pair ofY stop-lugs on the aluminum stencil-cylinder for engagement With the displaceable stopmember, so that the impact strain resulting from this engagement will be transmitted tothe frame of the stenciling machine through partsfivell suited to stand such strains. In carrying out this feature the lugs are integrally joined to a Work-sheet timing cam,'

which is rigidly mounted on the cylinder adjacent one end.

Another feature ot the invention resides in the provision of devices effective for adjusting the timing cam peripherally around the cylinder over a large extent of angular arc,

and for also adjusting the cam with a subto the facory to have the parallelism restored.

It is a feature of the present invention to provide means for bringing the stencil-cylinder and platen-roller into parallelism when displaced therefrom, which means can be easlly operated in the office where the machine is used and without disabling it.

In carrying out further features of the invention, it is proposed that the platen-roller shaft be knurled intermediate its ends and have a. core of hard rubber molded therearound, and an outer shell of rubber softer than has been used heretofore be fastened to the core for securing more positively inked stencil-characters; that two side-edgel guides for Work-sheets be provided on the front feed table, each of the guides to have a large lateral adjusting movement, and one of the guides to have in addition a micromel ric adr movement; that means be provided for cushioning the strain resulting from the displaceably-mounted platen-roller falling away from the stencil-cylinder; and that the stencil-sheet be positively clamped on the stencil-cylinder against loosening by a plate havin suitable longitudinal serrations for engaging the stencil-sheet.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is a fragmentary perspective View of a duplicating machine having ceriain features of my invention applied thereto. In this view, the machine is shown as set for havin work-sheets rapidly fed to the stencilcy inder while the latter is being continuously rotated.

Figure 2 is an opera-tional view, showing m" the relative location of the parts when the auxiliar feeding mechanism is disabled and the mac ine is set to have work-sheets manually inserted past the auxiliary feeding mechamsm to stenciiinv position. In this view, l the work-sheet lead'ng-edge gages are shown locked in ineffective position.

Figure 3 is a fragmentary perspective view illustrating an operaive connection between a stop for the stencil-cylinder and work-sheet leading-edge gages employed in practicing my invention.

Figure 4 is an elevational view, looking toward the front of the machine., partly I broken away, of work-sheet side-edge guides mounted on the feed table of the senciling machine.

Figure 5 is a detail side view, partly in section, illustrating a preferred construction `of a. platen-roller employed in practicing my invention.

Figure 6 is a detail view, in cross-section illustrating the construction of devices for varying the timing of the auxiliary worksheet-feedin mechanism.

Figure 7 1s a det-ail view, showing a small developed or flat portion of the perforated shell of the stencil-cylinder.

Figure 8 is a fragmentary side view of the stenciling machine in which is illustrated means for adjusting the platen-roller angularly with respect to the axis of the stencilcyfinder.

Figures 9, l() and 11 are operational views, showing the relative positioni of certain parts during diti'eren-t stages of t two kinds of steneiling operations capable of being perforn'ied on the stenciling machine of the present invention, one kind when the stencil-cylinder is continuously operated and the other when it is stopped after stenciling each sheet.

Figure 9 is a view similar to Figure 2, eertain parts pertaining to the auxiliary worksheet-feeding mechanism being shown in this view which were omitted in Figure 2'for sake of clearness.

Figure 10 shows the work-sheet leadingedge gages set for gaging a work-sheet which has been inserted against them, to be fed thereafter to stenciling position by the auxiliary worksheet-feeding mechanism.

Figure 11 shows the work-sheet just after its leading edge has passed between the stem cil-cylinder and the platen-roller after being fed thereto by the auxiliary feeding mechanism from the Figure 1() position. In this view, the gages are shown temporarily removed from the path of the worksheet.

Figure 12 is a detail view, in cross-section, which illustrates the clamping device for hnlding the stencil-sheet taut around the stencil-cylinder. The dot-and-dash outline of the clamping device illustrates a preferred way of bringing the same into engagement with the stencil-sheet.

A duplicating or stenciling machine for carrying out the present invention may have a main frame, generally designated as 10, made up of right-hand and left-hand side plates 11 and 12, respectively, which plates may be connected by cross-bars 13. The side plates 11 and 12 may be supported on soft rubber feet 14. Reduced upper end portions 15 of the side-frame members 11 and 12 am arranged with bearings 16, each of the latter including a cap 17 which may be removably fastened by screws 18. The bearings 16 are arranged to receive a shaft 19 of a stencilcylinder 20.

A paper-feed table, generally designated ls 21, is pivoted at the front of the main frame on screws 22, and may be supported by bracket-arms 23. The construction of the table 21 may be substantially the same as the paperfeed table shown and described in said copending application of Thatcher, except as otherwise noted hereinafter.

For lateral guiding work-sheets lV While feeding them, one by one, to stenciling position or to an initial position for engagement by the auxiliary work-sheet-feeding mechalll) ., 36, respectively.

by cementing.

nism of the machine, right and leftv lateral guides 26 and 27, respectively, are mounted on the table 21. The guide 26 includes a guide-plate 23 disposed perpendicularly to the work-face of the work-table 21, and at right angles to the axis of the cylinder 20. The plate 28 is riveted on two laterally-extending screws 29 which pass through holes in an upreaehing flange-extension 30 of a rightwardly-extending elongated braclretplate 31 which has a lengthwise slot 32, A spacer-plate 33 is riveted to the table 21 under the bracket-plate 3l and has two bent-up guide-lugs 311i, one on'eacli end for engaging with a sliding fit in the slot 32. A lower end of an upreaching screw 3l" is riveted to the plate 33 and extends up through the slot 32 to receive a thumb-nut 36 for adjustably fastening the plate 31 on the table 21. A relatively stiff compression spring 37 is disposed aroun'd the screws 29 between the guide-plate 26 and extension 30, and a thumb-nut 3S is provided to engage around the outer free end of each of the screws 29. This eonstrnction` can be seen from inspection Figures 1 and 4C, permits a relatively great lateral adjustment of the guide-plate 23, and also provides for micrometric adjustment which is very useful for accurately positioning worl-- sheets which are required to have side margins of exact widths.

The left-hand guide 27 may be fastened as by riveting to an upreaching flange-extension 4.0 upon the right end of an elongatedbracket-plate 41 provided with a lengthwise slot 42. The plate-member may be adjustably fastened to the table by a plate 43, a screw 44 and a thumb-nut 45, which may be construct-ed like the plate 33, screvvT 35 and nut As will be' noted from inspection of Figure et, the guides 26 and 27 are held slightly above the work-face of the table 2l. A safeguard against the lower worksheet YV` of a feed-pack disposed in position between the guide-plates 26 and 27 slipping endwise under the guides is provided by having each of the `guides and 27 terminate in an inreaching shelf-extension 46 on which the lowest work-sheet will rest.

finished work-fa ce of the table 21, each extension may have a protective platine` 47 of a soft material, such as leather or rubber, which plating may be fastened to the extension, as A micrometric adjustment of the guide 27 is not essential since such an adjustment is provided for the pairedguide 26, which may be accurately set first, and a work-sheet to be stenciled maybe placed with -the right-hand edge against the giiide 26 and the left guide may then be moved up within close proximity to the kleft sideV edge of the work-sheet. y

For providing a rolling Contact between a -Work-sheet-.T/V and the stencil-cylinder 20, a

To prevent Athe extensions 46 scratching or marring the pressure-roller 50, sometimes called a platenroller, is mounted on a metal shaft 5l which is supported in a swing-frame 52 for engaging against the lower side of the cylinder. It has been found that more evenly inked stencil-characters are secured by employing a pressure-roller of softer rubber than has been used heretofore. As is well known in the rubber art, soft rubber cannot be securely and permanently bonded directly on a metal shaft. It is a feature ofthe present invention to provide a rubber pressure or platen roller of the desired softness which is firmly and permanently secured on the metal shaft 51. To this end. the shaft is provided with linurls 53, and a hard rubber core 5e is molded around the shaft and grips the latter firmly and rigidly because of the knurls. An outer shell 55 of suitably soft rubber may be bonded securely to the core 54 as by vulcanizing in a well-known Way.

A roller-bearing' unit 56 may be of a wellknown construction. It is usually mounted (see Thatcher Patent 1,683,741) on each endportion of shaft 51, and the two units usually engage in annular grooves 57 cut in the peripheries of concave semi-circular bearing notches 58 n.5- ally provided in side-frame members 60 of the frame 52.

Each side-frame member 6() extends from the roller 50 toward the front and has an enlarged front end provided with apertures which engage with a running fit about a cross-v rod 61. It is very important for doing good stencil-wor land for getting a. maximum life from stencil-sheets employed in the stenciling, that the axis of the platen-roller 50 be accurately parallel to the axis of the stencilcylinder 2O so that'the latter and the platenroller may have a true tangential engagement with each other. As stenciling machines have been constructed heretofore, the platenroller was usually fixed in parallelism with the axis of the stencil-cylinder at the factory, ano` if this parallelism was accidentally destroyed after leavingr the factory it was usually necessary to return the entire stenciling machine to the factory to have the above-noted parallelism restored. A feature of the present invention resides in providing` for bringing the axis of the roller 50 into parallelism with the axis of the cylinder 20 byf means which can be easily and quickly operated in the efiice where the stenciling machine is being used. and without dismantling the machine, To this end, an elongated slot 62 is provided in the left side plate 12. the long axis of the slot being disposed in a substantially horizontal plane through the axis of the cross-rod 61, which passes outwardly through the slot and is pivotallyfastened to an adjusting arm 63. This arm may be pivctally fastened against the outside faceof the frame-member 12 on a screw Gepositioned above the rod 61 and threaded in a tapped hole in Ythe frame-member. The arm extends downwardly adjacent the lower edge of the frame-member and terminates in an inverted T-shaped portion 65 which is provided with an arcuate slot 66 which centers about the screw 64. A shoulder-screw 67 engages through the slot 66 and threaded into the frame-member 12 to be etl'ective to press the lower end of the arm 63 tightly against the face of the frame-member 12. It can be seen from the above description and an inspection of Figures l and 8 that the crossrod 61 and shaft 51 may be adjusted angularl'y with res )ect to the axis of the cylinder in a plane substantially parallel thereto by simply loosening the screws 67 and 64 and swinging the arm 63 the necessary amount, and thereafter tightening the screws 64 and 67, which operations can be easily performed from outside the frame and without removing any parts from the machine.

It will be noted that mounting the shaft 51 in the ball-bearing units 56 is especially advantageous because of preventing binding of the shaft 'when it is moved a small amount mgularly into parallelism with the stencilcylinder shaft 19. An auxiliary worksheet-feeding mechanism is provided in practicing the present inmtion, and includes a plurality of axiall aligned rollers 7() which normally project slight y above a stationary rearward extension 7110i the feeding table 2l. The rollers 70 are mounted on a shaft 72 which is journaled `in the side-frame members 69 of the swing-frame 52, and each end of the shaft maybe arranged with a ball-bearing frictionreducing unit (not shown) which may be constmloted and mounted like the unit 56 so as to permit slight angular movement of the shaft 72 without binding.

For rotating the rollers 70 in the same direetion as the platen-roller 50, the shaft 72 may be connected to the shaft 51 by a geartrain 73 which may be constructed like the gear-train disclosed in the above-noted application of Thatcher.

The platen-roller 50, in operative position, engages against the lower side of the stencilc vlinder and establishes a stenciling position wherein the work-sheets W are brought into rolling contact, one after another, with a stencil-sheet 75. It is a feature of the present invention to provide means for yieldingly urging the platen-roller with a uniform pressure against the stencil-cylinder at all points along the line of contact of the cylinder and roller. To this end, each of the side framemembers has an integral downwardly-projecting apertured lug-member 76. The ends of a cross-rod 77 are journaled loosely in the lug-members 76. A downwardly-extending guide-rod is fastened in a diametrical hole through the cross-rod 7 7 and is referably positioned in a vertical plane w ich is parallel to the sides of the swing-frame 52, and extending through the center of gravity of the swing-frame. The lower end of the rod 78 passes through an oversize hole 79 in a laterally-extending stub-shaft 80 rotatably mounted in the rear end of an arm 81, which extends forwardly and is rigidly fastened to a rock-shaft 82 extending between the side frame-members 11 and 12. A recess 83 may be made in the upper side of the shaft 8() around the hole 79 to form a scat for a relatively stiff compression spring 84, which engages around the rod 78 between the crossrod 77 and the shaft 80.

The lower end portion of the rod 78 extends below the shaft 8() and is threaded for receiving two nuts'85 which are effective for adjusting the initial tension in the spring 84, for a purpose to presently appear. Means for releasably locking the platen-roller 50 in operative engagement with the stencilcylinder 2O may include a locking arm 86 mounted loosely on the right end of the shaft 82 and disposed against the outer face of the side frame-member 11. The arm 86 may have an operative and adjustable connection to the shaft 82 by devices including a bell-crank member 87, which is pivoted in the arm 86 and has a tooth 88 engaging in atwo-toothed gearmember 89 fast on the shaft 82. A graduated adjusting head 90 is rotatably mounted on the right end of the shaft 82. The abovementioned device connecting the arm 86 and the shaft 82 may be constructed as disclosed in Patent No. 1,559,058, granted to Linden A. Thatcher October 27, 1925.

When the platen-roller 50 is held in operative position, the arm 86 is locked in the Figure 1 position by a spring-held locking trigger 91 which engages a reduced front end portion of the arm. For manually releasing the trigger 91, the latter has a fingerpiece 92 extending forwardly substantially at right angles to the body of the finger-pie. For restoring the arm 86 to its locking (Figure 1) position, a finger-piece 93 is provided on the arm.

It can be seen from the above description in connection with the inspection of Figures 1 and 8, that the platen-roller 50 can be umd against the cylinder 20 with a light or a heavy pressure, which can be easily varied by the use of either the nuts 85 or the adjusting head 90, or both together. It will also be noted that by the above-described construction the setting of the platen-roller 50 for a, thick work-sheet can be changed for accommodating relatively thin work-sheets wit-hout affecting the desirable resilient shock-absorbing support of the swing-frame 52 provided by the spring 84. It will be further noted that co-action of the abovedescribed non-rigid swing-frame 52 and the rockable support of the same by the resilient spring 84 is effective to urge the platen-roller with uniform pressure 'at all points against the stencil-cylinder, irrespective of small manufacturing variations.

,An auxiliary work-'sheet-feeding mechanism is employed inthe present invention, and includes iii-addition to the rollers a plurality of rollers which are revolubly mounted on a swing-shaft 96, one of the rollers 95 being positioned above each one of the rollers 70.` -The shaft 96 is mounted in the rear ends of two rock-arms 97, each of which is `rockably mounted on the cross-rod 61. For moving the rollers 95 down into engagement againstv the roller '70 at a predetermined time, a cam-roller 98 is mounted on a rear upturned end of a lever 99 for engagement with devices, hereinafter described, and which are mounted on the stencil-cylinder 20. The lever 99 is fulcrumed loosely about a rock-shaft 100 and is operatively connected to the latter for rocking it by instrumentalities including a rod 101, a spring 102 therearound, and a bell-crank 103 operatively connectedto the rod 101 and fastened on the right end of the shaft 100. Operative connections between the shaft 100 and the right and left roller-carryingarms 97 include, for the right arm, a rearward extension 104 of the Same, anda link 105 loosely fastened to the extension and the bell-crank 103; and for the left arm, a rear extension 106 of the same, a bell-crank 107 fast on the shaft 100, and a link 108 loosely connected to the eX- tension 106 and the bell-crank 107. The rollers 95 are spring-urged toward an upper ineffective position whichis determined by a stop-screw 109 in the frame 10, which is arranged to be abutted by a portionr of the bell-crank 107. The construction of the parts forming the operative connections between the cam-roller 98 and the rollers 95 may be the same as for like parts disclosed in the above-noted co-pending application of Thatcher. c

lVhen the stenciling machine is operated in a manner to have the stencil-cylinder 20 continuously rotated, each work-sheet W is manually inserted to a starting or initial position, wherein it is engaged by the rollers 70 and 95 and advanced by them to stenciling position lbetween the stencil-cylinder 20 and the platen-roller' 50. Work-sheets W are gaged to initial position by two upreaching leading-edge gage-pins .110, each of which is integrally joined to the end of an arm 111 of a U-shaped bail-member 112, the latter being loosely pivoted on the cross-rod 61, and is held against lateral movement thereonby pins 113 in the rod 6'1. Similarly arranged pins 113 may be employed for holding the side-frame member 60 against lateral displacement on the rod 61.

For moving the gage-pins out of the path of the work-sheet W, the bail 112 is operatively connected tothe rock-shaft 100 by means of a bolt 114, a spring 115 therearound, and an arm 116 Vfastened on the rockshaft 100, and operatively engaging the bolt 114." The construction of the above-mentioned work-sheet gaging devices may be the same as for similarv devices disclosed in the above-noted (3o-pendingV application of Thatcher, except as hereinafter described.

Should the leading edge of a. work-sheet lV fail to reach stenciling position before the inked stencil-sheet 75 on the continuouslyrotating stencil-cylinder 20, the platen-roller 50 would be smudged. 4To guard against such undesirable smudging, means are provided in the present invention which includes a plurality of feeler-pins 118 mounted on a lateral bar-member` 119 which is carried by arms 120 fastened on a rock-shaft 121. Mechanism operatively connected to the rockshaft 121 is set by upward movement of the feeler-pins when a work-sheet is not properly placed in initial position, and is operated by a predetermined rotary movement of the stencil-cylinder 20 for releasing the locking trigger 91 and letting the platen-roller 50 fall away from the stencil-cylinder. This stencil-cylinder-operated mechanism includes a rearwardiy-extending arm 122 fast on the shaft 121, an upstanding lever 123 pivoted on the rearend of the arm 122 and terminating in an npr-caching trip-finger 124 which, upon upward movements of the feeler-pins 118,` is moved upward into the path of a lug 125 carried by said stencil-cylinder. A link 126 operatively connects the lower end of the lever 123 to the trigger 91. The construction and operation of the mechanism. just described for automatically unlocking the plater1-roller 50 may be the same as disclosed in said co-pending application of Thatcher.

A cam-device, generally designated as 130, is carried by the cylinder 20 and has an outwardly inclined cam-element 131, a dwellelement 132 and a? declining element 133.

Engagement of the cam-element 131 with if the cam-roller 98 is effective, through the above-described mechanism, to swing the rollers 95 downwardly against the rollers 70. The positioningof the cam-device on the cylinder therefore determines the instant of operation of'the work-sheet auxiliary feeding mechanism,'and thus controls the timing of the work-sheets. It is therefore very desirable to mount the cam-device on the cylinder 20 for' peripheral adjustment therearound. For reasons to presently appear, it is desirable to provide two integral stop-lugs 1351` and 135 on the cam-member 130, which lugs in performing their functions hereinafter disclosed will be subjected to impact strains.

It is a. featureof the present invention to mount the cam-member 130 on the stencilcylinder for peripheral adjustment therearound over a large extent of angular arc,

malso provide for a substantially micrometric angular movement of the cam-member forafmdingline adjustments of the stencilingm ron the worksheets, particularly oewo -shoots having forms printed thereon. 'itis a further feature of the invention to provide `a strong, rigid mounting for the cam-r whereby the strains transmitted to it from the lugs 134 and 135 will be further trannitted to a portion of the cylindex' 20 well suited for receiving such strains. In carrying out these features, the right end portion of the stencil-cylinder barrel is arwth an inte l, internal annular rib-0r h 140 which is positioned inwardly a short distance from the right extremity of the cyadorebarrel. The outer surface of the rib is nished smooth to have seated closely at ita rotatable end or head member 141 'oh has en integral, outreaching cylindrical flange or rim 142. The outer surface of the rim 142 ieinishcd smooth to enga-ge with ihoclose t in the right end of the cylinder 2Q, the latter bein finished smooth for receiving the end mem r.

`The width of the rim 142 need extend out from the end member 141 only slightly beyoud theright end of the cylinder-barrel, except that it is widened at one point to provide anY integral outreaching shelf 143. The cenvdevice 130 is strongly and ri idl mountedon the convex face of the s el 143 by screws 144, which may pass through apertumd flattened ears 145, one at the outer end of the cam-element 131, and one at the outer end of the declining element 133. To brace the oem-devi 130 against being displaced about a line through the screws 144, an integralextension 146 of the lug 125, which is integrally joined to the dwell-element 132, is bent down and has an apertured ear 147, which may be fastened to the rim 142 by a screw 148.

The cylinder end member 141 is provided with an integral hub 150, apertured for engagi around the shaft 19. For fastening the hn on the shaft, the hub is made with a Slot 151 for receiving a pin 152 which is inserted in a hole in the shaft.

Two

arcuate siots

153 and 154 are cut through the lend member 141, and are disposed d-iametrically opposite each other, one on eachside of the axis of the hub 150, around which the slots center. Each slot extends over an `angular are of approximately 9() degreoscand is sitioned near enough the rim 142 that the inner periphery of the rib 140 extends wellpast each slot., preferably a half inch or more;

@A shoulder-stud 155, having a diameter slightly smaller than the width of the slot 153, extends' therethrough and has a reduced Inner end rtion which extends with a tight fit throng a hole in the rib 140, the inner terminating in a riveted head 156, formed tightly against the inner face of the rib. `A thumb-nut 157 engages over the outer end of the stud and is eective to press the ai jacent portion of the end member 141 tightly against the rib 140. v

A stud-screw 158, which ma be a duplicate of the stud 155, is dispo opposite the latter in the slot 154, and has a reduced end portion passing through a hole in the rib 140 and terminating in a riveted head 159 formed tightly against the inner face of the rib which holds the screw 158 firmly in position at right angles to the end member 141. A piniondevice, generally designated as 160, has a barrel-portion 161 arranged with an axial bore 162 for engaging around the .stud 1,58 with a running lit. An enlarged integral end of the barrel 161 has gear-teeth cut in it to form a pinion 163. The outer end of the barrel is enlarged and knurled to form a thumb-screw head 164.

A convex gear-sector 165 is fastened, as by screws 166, to the outer face of the end member 141, and is disposed a distance inward from the slot 154 suiciently to have the teeth of the pinion 163 mesh with the teeth of the sector. The left end of the cylinder 20 (not shown) may be integral therewith and arranged to turn freel about the steneil-cylin der shaft 19 when tlie latter is held stationary. It can be seen from inspection of F` ure 1 that the stencil-cylinder 20 being bgd against rotary movement and the thumb-nut 157 being loosened, rotation of the thumbscrew head 164 will revolve the end member 141 and move' with it the cam-device 130 angnlarly with respect to the leading edge ofY the stencil-sheet 75 on the cylinder 20.

The pitch-diameter of the pinion 163 is very small relative to the pitch-diameter of the gear-sector 165, and it can be 1 readily seen that by a suitable rotary manual movement of the thumb-piece 164 a substantially micrometric adjusting movementofthe camdevice 130 is obtainable; To facilitate setting the cam-device 130, a graduated scale 167 of a well-known kind may be mounted on the rim 142for cooperation with an index mark 168 on the cylmder 20. When the cam-device 130 has been set in the desired predetermined position, the thumb-nut 157 may be screwed down tightly, and a jam-nut 169 may be screwed inward around the outer end of the screw 158 unt-il it forces the pinion-member tightly against the end member 141. The end member and the cani-device 130 thereon will now be fastened securely against rotary movement relative to the cylinder 20. Any strain which cornes on the cuwdevice will be transmitted to the end member, thence to the shaft 19, at a point adjacent the side frame-member 11.

Itis a feature of the present invention to provide an improved means for holding the stoncil-sheet 75 taut on the stencil-cylinder pear.

of the duplicating machine. To this end, a lengthwise channel or groove 17 0 is formed in the cylinder 20 by bending inward end portions 171 of a perforated shell 172 of the cylinder and fastening each end portion to a channel-plate 17 3 by screws 174 as illustrated in Figure 12. Each end of a'usual ink-mat 175 may be arranged in a well-known way for receiving a rod 176. lVhen the mat is engaged around the cylinder 20 with almost a sufficient operative tautness, the rods 17 G will both hang over into the channel 170 against the end portions 171, a short distance above the lbottom of the channel. Vhen the stencil-sheet is engaged closely around the mat 175, the two ends of the stencil-sheet will extend over into the channel 170 well past the rods 176.

For holding the stencil-sheet tautly and securely in place, there is provided a combined cover and clamping plate generally designated as 17'7 and having a convex outer face 178, which face is curved approximately in the same radius as the stencil-cylinder shell 172. The clamping plate is further provided with side mem'bers 180 which converge toward each other. The outer faces of these said devices have a plurality of lengthwise serrations or fine teeth 181 of triangular cross-section. The outer edges of these triangular teeth will preferably be slightly dulled for reasons to presently ap- The rate of convergence of the side members 180 will be such that when the plate 177 is put in place over the groove 17 0 and pressed down until its outer face forms a substantial continuation of the curved surface of the stencil-sheet 75, the teeth 181 will grip the ends of the stencil-sheet securely against the ink-mat portions around the rods 17 6, the latter usually being pressed down adjacent the bottom of the channel 170. This construction, besides helping to draw the stencil-sheet 75 and mat 175 taut around the cylinder 20, serves eHiciently its main purv ing devices of the kind described in Patent No. 1,597,250 granted to E. G. Rowley August 24, 1926.

In carrying out the feature of the present invention, which provides for changing the work condition of the stenciling machine so that the machine when arranged for stenciling work-sheets fed to thecontinuously-rotatingstencil-cylinder can be changed so that the work-sheets may be inserted more accurately to the stenciling position between the stencil-cylinder 20 and the platen-roller 50 while both are stopped, means are provided for stopping the rotation of the cylinder after each work-sheet is stenciled. These stopping means include a stop-member 185 which is pivotally mounted about an inreaching pin 186 fastened securely, as by riveting, in an arm 187 which is pivoted on a shoulderscrew 188 in an inreaching lug 190, the latter being integrally joined to the right side plate 11. A tensile spring 191, at one end fastened to the arm 187 and the other end fastened to a fixed member of the machine-end, is effective for normally urging the forward end of the stop 4185 down against the head of the screw .188. The arm 187 extends rearwardly from the lug 190, and its rear end is bent rightwardly to form a flange-like camfollower 192. rlhe pin 186 is positioned between the lug 190 and the flange 192. A tensile spring 198, which has one end fast to the arm 187 and the other end to a stationary member of the machine (not shown), is effective to urge the lower edge of the cam-follower 192 against a feed-control cam-device, soineuimes called a change-over device, and generally designated as 195. This device may be pivotally mounted on an inreaching lug 196 integrally joined to the side frame 11 and positioned rearwardly from the lug 190.

rlhe change-over device 195 may be formed as illustrated in Figures 1 and 3 from sheet metal. The device may have an arm 197 which extends rearwardly in stops opposite an arcuate slot 198 provided in the side framemember 11. A handle 200 for setting the change-over device in either feed-control position is fastened to the rear end of the arm 197 and extends rightwardly through the slot 198 beyond the outer face of the framemember 11. A portion of the device 195 adjacent its pivot is arranged with a cam-edge 201, and preferably has a shape such as is illustrated in Fivure 2.

Yhen the handle 200 is disposed adjacent the lower end of the slot 198, as illustrated in Figure 3, the flange 192 rests in a notch 202 at the forward end of the cam-edge 201. W'hen the handle 200 is wung up adjacent the upper end of the slot 198, the vcam-follower 192 rides upwardly on the cam 201 to the Figure 2 position against a stop-linger 203 integrally joined to the cam-device. The change-over device 195 is latched in its upper (Figure 2) position by engagement of the flange-like cam-follower 192 in a shallow notch 204 at the base of the stop-finger 203, the spring 193 being effective to pull the arm 187 down with force enough to latch the change-over device securely in this position. The upward movement of the arm 187 is effective to raise the cylinder-stop 185 to operative position, wherein it is effective for engaging the stop-lugs 134 and 135m stop- 3 link 211.

ping the cylinder 20 after each Work-sheet 1s steneiled. In its effective position the stop 185 co-acts with the stop-lugs 134 and 135 in the same way as is described in Patent No. 1,583,612 granted to me May 4, 1926.

It canbe seen from inspection of Figures 1 and 10 that when the stop-member 185 is moved to position for co-opera-tion with the lugs 134 and 135 for accurate feeding of work-sheets directly to stenciling position that the ga ,re-pins must be removed from the path o the worksheets IV. It is a feature of the present invention to remove these pims simultaneously upon movement of the stop-member 185 to effective position. To carry out this feature, the change-over device 195 has a forward extension 205 which terminates in` a rightwardly-bent flange 206 disposed forwardly from the lug 196. A bail` member 207 has a cross-piece 208 disposed alongside the rock-shaft S2 in front of the same, and has a right-hand and a left-hand arm 209 and 210, respectively, apertured adjacent the cross-piece 20S for engaging loosely about the shaft 82.

The bail 207 is positioned on the shaft 82 so that the rear end of the arm 209 is disd in front of and a short distance below the flange 206, to which it is connected by a The bail 207 is secured against lateral movement on the shaft 8:2 by pins llengaging in holes in the shaft S2. The lengthy of the crossbar 20S is such that the arm 210 is disposed directly under the righthand arm 111 of the bail 112 to which it is connected by a stiff wire link By inspection of Figures 2 and 3 it can be seen that when the handle 200 is moved from its lowermost (Figure 3) position to its uppermost (Figure 2) position wherein it makes the stop-member effective, the gagepins 110 will be pulled down entirely out of the path of the worksheets IV. The above described co-action of the spring 193, the notch 202 and the flange 102 is effective to hold the pins 110 locked down in a disabled condition against the pressure of the spring 115.

In order that the connection between the stop 185 and the pins i110 will not interfere with the normal operation of the latter when the stencilinpr machine is set for continuous rotation of the stencil-cyliinler 20, the link 212 has a one-Way connection with the righthand arm 111. This may be arranged by having the wire link 212 extend upward through an over-size hole 213 in the arm 111 and by having its upper end portion 214 bent over rearwardly as*illustratedinwlfigure 3.

It will be noted that the rear extremity of the extension 71 of the front feed table 21 terminates closely adjacent the bite of the cylinder 20 and the platen-roller .70. This arrangement facilitates the accurate manual insertion of work-sheets IV to stenciling posi tion after the auxiliary feeding mechanism is disabled.

The shell 172 of the cylinder 20 will have round perforations 215, which are preferably smaller than have been used heretofore.

As the work-sheets IV are stenciled, they may be collected at the delivery side of the cylinder 20 in a well-known way in a tray or bin 216, which may be constructed like the work-sheet-receiving bin described in the above-noted application of Thatcher No. 334,157.

It can be readily seen that some of the features of the present invention described hereinbefore may be applied to character-impressing devices other than stenciling Inachines. e

Variations may be resorted to within the scope of the invention, and portions ofthe improvements may be used without others.

Having thus described my invention, I claim:

1. In a stenciling machine, the combination with a stencil-carrying cylinder mounted for continuous rotation, aplaten-roller operatively engaging said cylinder to establish a. stenciling position' for a work-sheet, and a feeding and timing mechanism effective for feeding to said cylinder while the same is being continuously rotated, a plurality of work-sheets, one after another in a. predetermined time relation to the stencilsheet on said cylinder, of means settable in al1 operative position for stopping said cylinder after each work-shect is stenciled, and devices operatively connected to said means and effective upon setting the same in operative position for disabling said mechanism and permitting work-sheets to be inserted directly to said stenciling position.

2. In a stenciling machine having an auxiliary work-sheet feeding mechanism, the combination with a stencil-carrying cylinder mounted for continuous rotation and for cooperation with said mechanism to stencil rapidly-fed Work-sheets, of a stop-dcvice for said cylinder settable in one position to be without effect on said cylinder when the latter is continuously rotated, and settable in another position to engage said cylinder and arrest the rotation thereof after each worksheet is stenciled.

3. In a machine for impressing inked characters on a work-sheet, in combination, a cylinder mounted for continuous rotation and' carrying instrumentalities for determining the characters to be impressed, n'iechamsm for repisllrfeedina and timing Worksheet-.Stone rate registration ofwork-sheets with respect vto said character-determining instrumentali- -ties than. is attainable when said cylinder is ccfmtinuouslyV and rapidly rotated.

f4. 'In a machine for impressing inked characters on a work-sheet, in combination, a cylinder mounted for continuous rotation and carrying instrumentalities for determining the characters to be impressed, mechanism for rapidly,feedingand timing work-sheets, one after another, to said cylinder while it is continuously and rapidly rotated, and manually-operable means controlling said feeding and timing mechanism and the rotation of said cylinder for changing the work condition of said machine, for securing more accurate registration of work-sheets with respect to'said character-determining instrumentalities, said controlling means including devices-settable for stopping said rotating cylinder after each stencil-sheet is typed and effective for disabling said feeding and timing mechanism. Y

5. lIn a stenciling machine, in combination. a stencil-carrying cylinder mounted for continuous rotation, mechanism for rapidly feeding and timingwork-sheets, one after another, to said cylinder while it is continuously and rapidly rotated, and manually-operable means controlling said feeding and timing mechanism and the rotation of said-cylinder sett-able to change lthe work condition of said machine forl securin'gmore accurate registration of the work-sheets with respect to the stencil-sheet on said cylinder when said worksheets are manually :fed to said cylinder.

6. In a stenciling machine having a rotatable 'stencil-cylinder, a platen-roller engaging against the lower side of said'cylinder to establish a stencilingv position for a worksheet and an auxiliary work-sheet feeding mechanism operativelylconnected with said cylinder, the combination with devices for gaging said work-sheets to a starting position from which they may be fed by said auxiliary feeding mechanism to said stenciling position in a predetermined time relation with respect to. the stencil-sheet on said cylinder, of manually-operable instrumentalities for removing said gaging Vdevices from the path of said 'work-sheet, and a work-sheet course eX- tending betweenv theoperative position of said gaging Vdevices and said stenciling position, whereby the leading edge of said Worksheet may be manually inserted past said gaging devices into the bite of said stencil-cylinder and platen-roller after said gages are removed.

7. In a stenciling machine having a rotatable stencil-cylinder, the combination with a displaceably-supported platen-roller engaging said cylinder to establish a stenciling position for a work-sheet, of means acting on the supports for said roller for adjusting the same to haveit tangentially engage said cylinder.

8. In a stenciling machine having a rotatable stencil-cylinder, the combination with a displaceably-mountedr platen-roller` engaging against said cylinder to establisha stenciling posiiion for a work-sheet, of means for adjusting said roller angularly in a plane substantially parallel to the axis of said cylinder, to bring said roller into parallelism with said cylinder. i

9. In a stenciling machine having a rotatable stencil-cylinder, the combination with a swing-frame, a platen-roller mounted in said swing-frame for engagement with said cylinder to establish a. stenciling position for a work-sheet, of means for adjusting the pivots of said frame, so as to move the axis of said stencil-roller angularly in a plane substantially parallel t0 the axis of said cylinder to bring said platen-roller' into parallelism with said platen-cylinder.

l0. In a stenciling machine having a rotatable sencil-cylinder, the combination of a platen-roller engaging aga-inst said cylinder to establish a stenciling position for a worksheet, a swing-frame for carrying said roller, a cross-rod in said machine substantially parallel to the axis of said cylinder, one end of said frame pivoted loosely on said crossrod, means for moving onek end of said crossrod angularly ina plane substantially parallel to the axis of said cylinder, whereby the axis of said roller is brought into parallelism with the axis of said cylinder. i

ll. The. structure described in claim 10, characterized by provision of ball-bearing units mounted on the cross-rod, said swingframe being mounted on said bearing units, and further characterized by the provision of ball-bearing units mounted in the opposite ends of said swing-frame, and a shaft for said platen-roller ournaled in said last-named bearing units, the fro-operation of thetwo sets of ball-bearing units permitting slight sidewise adjustment movements lof said frame relative to said cross-rod without binding the latter or said platen-roller shaft.

12. In a stenciling machine having a stencil-cylinder, the combination with a displaceably-mounted platen-roller locked in operative position for engaging against the lower side of `said cylinder to establish a stenciling position'for a work-sheet, means controlled by said work-sheet for releasing said platen-roller, and cushion means for stopping the movement of said roller away from said cylinder without causing severe strain on said machine.

v 13. In a stenciling ymachine of the class described, having a stencil-carrying cylinder, the combination of a platen-roller movable upward to position for engaging against the lower side of said cylinder to esablish a stenciling position for a work-sheet, a swinghams-for carryin said roller, including a. cross-rod between t 1e sides of said frame, and -menm for lockingsaid swing-frame in posihionlto boing said roller into yielding engagemt'with said cylinder, said means including? a rock-shaft, an arm fast on said rockslmfty'yielding devices between said arm and said cross-rod for supporting the weight of said swing-frame and releasable means for locking said shaft agains;l rotation by the weight of said swing-frame when the latter is for supporting said platen in operative position.

14. The structure described in claim 13, characterized by the yielding devices including a guide-rod fast to said cross-rod and slaidnblfyconneced toy said arm, and a helical spring disposed around said guide-rod.

1li.` In a stenciling machine having a stencil-gcyliuder, a platen-roller engaging sai cyl-miler to establish a stenciling position for a work-sheet and an auxiliary work-sheet mechanism, the combination with work-sheet Beading-edge gages for arresting said work-sheet in position for engagement by said auxiliary feeding mechanism, of mms for supporting said gages in effective position, means for removing said gages tempor to an ineifective position while a workeet is being advanced by said feeding mechanism from the eiective position of sud gages to wid stenciling position, and meaux operatively eonmscted to the supports for said gages for moving the latter to, and locking them in, a second ineffective position entirely out of the path of said work-sheet, whereby' the latter may be inserted directly to said stenciling position.

1u; The structure described in claim 15, characterized bythe operative connection betwnf the locking means and the work-sheet gage-supports being arranged whereby interference with the movement of said gages from their effective iosition to their Iirst-named inelfective position and back again to their effective position is avoided.

17. In a stenciling machine having a stencil-carrying cylinder and a platen-roller engaging against said cylinder to establish a stenciling position for a work-sheet, the combination with an auxiliary work-sheet feeding mechanism and means for timin 1 worksheets fed by said cylinder, so that t ey will mach said stenciling position in a predetermined time relation with the stencil-sheet on said cylinder, said timing means including a elm-roller disposed beyond one end of said cylinder, of' a cam-member, and means for mounting said cam-member on said cylinder for operative engagement with said cam-rolleimd for peripheral adjustment around said cylinder-,whereby it may control the timing of said auxiliary feeding mechanism.

t 13. In a stenciling machine having a steneil-carrying cylinder andV a platen-roller engaging against said cylinder to establish l stenciling-position for a work-sheet, the com bination with an auxiliary work-sheet. fwding mechanism and means for timing woah.-

sheets fed by said cylindenso that they will t reach said stenciling position in a merkt!!- mined time relation with the stenci -shet l said cylinder, said timing means including o cam-roller operatively u connected: tnv mid mechanism and disposed beyond one end of said cylinder, of a cam-member, and mem for mounting said cam-member on said cylinder for operative engagement with said cam-roller and for peripheral adjustment around said e linder, whereby it may control thc timing o said auxiliary mechanism, said mounting means including al end member of said cylinder having devices iol angularly adjusting said member relative to the remainder of said cylinder and a shellmember integrally joined to said emimembor and extending outwardly into the plane of said cam-roller.

19. The structure described in claim 18, characterized by said shell-member being in tegrally joined at the rim' of said end meinber, and said end member having a diameter to fit snugly inside the ebelt-portion of said cylinder.

20. In a stenciling machine, a stencil-carrying` device including ay perforated cylindrical shell. a head in the form of an internal aamblar rib fast to sai-d shell adjacent one end thereof, and an end member adjustably faatened to said head and having a timing device for adjusting said end member angubrly with respect to said shell, and means u n said end member for controlling the feedoo work-sheets to the stencil.

21. In a stenciling machine, a stencil-carrying device including a perforated cylindrical shell, a head in the form of an internal annular rib 'fast to said shell adjacent one end thereof, and an end member adjustably fastened to said head and having a timing device for adjusting said end member angularly with respect to said shell, and means n on said end member for controlling the f of Work-sheets to the stencil, said timing device including means effective for adjusting said end member with a substantially micrometric movement.

JAMES E. SHAVER, Jn.