US2432133A - Device for separating printing rollers in the absence of paper sheet - Google Patents

Description

G. BABICZ Dec, 9, 1947.

DEVICE FOR SEPARATING PRINTING ROLLERS IN THE ABSENCE OF PAPER SHEET Filed Dec. 15, 1944 5 Sheets-Sheet 1 INVENTOR.

Dec. 9, 1947. r G. BABlCZ 2,432,133

DEVICE FOR SEPARATING PRINTING ROLLERS IN THE ABSENCE OF PAPER SHEET Filed Dec. 15', 1944 5 Sheets-Sheet 2 INVENTOR Gear efiabw BY Dec. 9, 1947. v e. BABICZ 2, 3 DEVICE FOR SEPARATING PRINTING ROLLERS IN THE ABSENCE OF PAPER SHEET Filed Dec. 13, 1944 s Sheets-Sheet s INVENTOR Patented Dec. 9, 1947 DEVICE FOR SEPARATIN-G PRINTING ROLLER-S IN THE ABSENCE OF PAPER SHEET I George 'Babicz, Chicago, 111.

Application December 13, 1944, Serial No. 568,023

9 Claims.

The present invention broadly relates to machines having a plurality of contacting rollers between which a material is fed, in combination with an electrical device for automatically separating the rollers when the material ceases to be fed therebetween for any reason. More specifically the invention relates to printing machines for the purpose of separating rollers so that the compressing roller may not unnecessarily gather ink when in contact with the printing roller when the paper to be fed therebetween to receive printing impressions ceases to be fed between the rollers.

A still further object of the present invention is the provision of a suitable electrical means including an electric circuit insulated from the machine, including a pair of contacts, one of which intermittently shifts towards the other, and in the path of the sheets of paper as it is fed towards the printing rollers, and whereby said contacts may complete an electric circuit in the absence of the paper so as to energize a solenoid, the latter connected with suitable mechanism for separating the rollers when the paper ceases to be fed therebetween.

A still further object of the present invention is the provision of a suitable mechanism whereby the rollers, on their separation, as aforesaid, make intermittent contact so as to grasp the paper as the same commences to be fed anew in between the rollers.

With the above general objects in view and others that will appear as the invention is better understood, the same consists in the novel construction, combination and arrangement of parts hereinafter more fully described, illustrated in the accompanying drawing and pointed out in the appended claims.

In the drawing forming a part of this application and in which like designating characters refer to corresponding parts throughout the several views:

Fig. '1 is a side elevational view of one end of a printing machine;

Fig. 2 is a side elevational view thereof from the opposite side;

Hg. 3 is a fragmentary, elevational end view of the machine, partly in section, the view having been taken substantially on line. 3-3. of Fig. 2;

Fig. 4 is a top plan elevational view of the ma chine;

Fig. 5 is an enlarged cross-sectional View through the electric contacts; and V Fig, 5 is a diagrammatic view of the electric circuit.

Referring in detail to the present drawings there is shown therein a pair of horizontal spaced frame bars Ill, supported in any suitable manner by and upon four standards I I, two of which are shown in the drawings.

Supported upon standards II and within any suitable bearings therein is shaft I2, which is driven by means of sprocket wheel I3, keyed thereto, and sprocket chain I4. Said sprocket wheel I3 and chain I4 are disposed outwardly of one of said standards -I. I. Carried by said shaft I2 is printing roller I5 which is disposed between a pair of end standards I I, as is seen in Fig. f1.

The upper ends of standards II are bifurcated with slots I5 wherein bearings I! are receivable, and wherein the same are adapted for upright shifting movement, being guided in that movement by means of flanges I-8 which engage the body of each of said standards I I andat the marginal edges of said slots I6.

Said'standards I I are topped by plates I9 which are a-fiixed thereto by means of screws 2!]. In threaded engagement with each of said plates I9, and downwardly depending therefrom is a cylin-v drical bar 2I, which has a reduced, lowerend 2, receivable within socket 23 made at the upper end of each of said bearings I'I. Interposed between the .bottoms of said plates I9 and upper ends of bearings I1, and encompassing each of said cylindrical bars 2|, is coil spring 24, normally bearing against bearings I1, and urging the same downwardly. Set within bearings I! for rotary movement is shaft 25 which carries compressing roller 26. Shafts I2 and 25 carry gear wheels 21, which mesh and through which the rotary movement of shaft I2 is transmitted to shaft 25, whereby rollers I5 and 26 rotate in opposite direction so as to receive the paper as the same is fed towards and between them for transferring thereto printing impressions from roller I5 while the paper is pressed thereto by roller 26.

At the opposite end of shaft I2 there is keyed thereto cam 28 which has rise 29 at one point of its periphery, forthe purpose of actuating bar 30 through contact with idler 3! carried by said bar 30. The lower end of said bar 30 is bifurcated as at. 32, within which the grooved portion 33 of shaft I2 fits, thereby maintaining the lower end of'bar 3!! in its operative position and without interfering with the operation of said shaft I2.

Attached in an adjustable fashion by means of slot 3.4 and, bolt 35 is link 36, having an enlarged head 31 at one of its ends, and within which shaft 3.8-is keyed. It will. therefore be seen that through $1. mfidium of slot 34 and bolt 35, which passes frame bar 40, and by its upper end supports shaft 38 within which the same is freely mounted for rotary movement.

The upper end of bar 30 carries a transverse pin 44, and a like pin 45 is alfixed to supporting member 4|, for the purpose of attaching thereto coil spring 46, which tends to urge bar 30 towards shaft l2, thereby maintaining idler 3| in constant f contact with cam 28.

Suspended upon the inner end of shaft 38, and in a transverse, as well as longitudinal adjustable relation therewith, and maintained thereon in its adjusted position by means of screw 41 is block 48, which by its lower end carries rod 49, which is longitudinally adjustable within said block 48 and readily engaged therewith in its adjusted position by means of screw 50. By its opposite angularly bent end said rod 49 carries a resilient strip 5|, which by its free end carries a rigidly aflixed inverted cup-like member 52 through which rod 53 is extended in a longitudinal relation. Said rod 53 terminates at its lower end in contact 54 which extends through strip 5| and insulating pad 55. Rod 53 adjacent its lower end has flange 56. Set upon rod 53 and interposed between flange 56 and the top wall of member 52 is coil spring 51 which urges contact 54 downwardly. A pair of nuts 58 engage the extended upper end of rod 53 in a threaded engagement, and interposed between said nuts 58 is one end of wire 59, the other end connecting with battery 60. It is of course understood that cup-like member 52, contact 54, flange 56, rod 53 and nuts 56 are insulated from strip 5| in any suitable manner, as well as from the entire machine.

Supported by transverse frame bars 6|, which connect with frame bars I is a pair of horizontal guides 62 and a pair of vertical guides 63 upon and within which paper 64 is guided in its shifting movement towards rollers l and 26 as the same is fed thereto by means of suitable conveyor, the latter not shown in the drawings.

Aflixed to the underface of one of said guides 62 is channel 65 filled with insulation 66, within which rod 61 is embedded. One end of said rod 61 terminates in an upwardly extending contact 68, in alinement with contact 54. The opposite end of said rod 61 extends beyond channel 85, and is threaded to receive a pair of nuts 69 in a threaded relation, for clamping therebetween one end of wire 10. The latter wire connects by its other end with solenoid 1|, which is supported upon shelf 12 adjacent the lower end of one of standards Wire 13 connecting with battery 60 and solenoid 1|, completes the electric circuit.

The upper end of contact 58 is substantially on a plane of the upper face of guide 52 and therefore on the plane of the shifting paper as the same is fed towards rollers l5 and 26.

, From the hereinabove description it will be readily seen that due to the action of cam 23 intermittent longitudinal shifting movement to bar 30 is imparted, rise 29, when contacting with idler 3| shifts said bar. 30 in one direction, while spring 46 retracts said bar 38 to its stationa y original position as riser 29 leaves said idler 3|. By virtue of this arrangement bar 38 is shifted away from shaft I2, and returned thereto, once during each revolution of cam 28 and roller |5. This intermittent shifting of bar 38 is transmitted to shaft 38, imparting thereto rocking movement through the mediumof link 36. This rocking movement of shaft ,38 is in turn transmitted to block 49, thereby causing intermittent movement of the outer end of strip 5|, and vertical movement of cup-like member 52 for intermittently bringing contact 54 toward contact 68 and away from it. Normally paper travels between contacts 54 and 68 upon guides 62, and there is no interference with the vertical shifting movement of contact 54 by the paper. The oscillation of contact 54 continues independently of paperras the same is fed to rollers |5 and 2B,

except that as long as paper continues to be fed,

the same constitutes an insulating gap between contacts 54 and 68, preventing the completion of the electric circuit through wires 59 and 73 and battery 65 for energizing solenoid II. If however there is no paper upon guides 62 contacts 54 and 68, directly touching each other on downward shifting of contact 54, will complete said circuit to energize said solenoid 1|. It is further observed that the downward shifting movement of contact 54 towards contact 68 occurs once during each revolution of rollers I5 and 26 due to the action of rise 29 upon cam 28, as the former actuates idler 3| and shifts bar 30 for rocking shaft 38, block 48, rod 49 and strip 5| for imparting intermittent oscillatory movement to contact 54 as hereinabove described.

On the opposite side of the machine plate 14 is affixed to the adjacent frame bar l0 by means of screws 15, the upper portion of which extends above the upper edge of said adjacent frame bar I0, and is off-set from that face outwardly. Mounted within one end of supporting member 4| and the upper portion of plate 74 is shaft 16, which is disposed transversely of the machine, and above vertical guides 63. Said shaft 16 carries a gear wheel 11 adjacent each of its ends and in a vertical alinement with each frame bar l8. Each of said gears 11 has an integrally formed bearing I3, spacing each gear from supporting member 4! or plate 14. Meshing with each gear 11 is pinion 19, each having an integrally formed bearing. 80. Said pinions l9 and their bearings are set upon shafts 8|, rigidly carried by supporting member 4| and plate 14, and upon which said pinions 19 are set for rotary movement when actuated by gears 71.

Set within recess 82 made in the inner face of each standard I and pivoted thereon by means of bolt 83 is lever 84, which is disposed below bearings l8 and 80 and in alinement therewith, and on a plane between gears 11 and pinions l9 and their respective supporting member 4| and the upper end of plate 14. One end of each lever 84 has an upwardly projecting extension 85, which contacts with and supports bearings il. Each of said bearings 80 has an integrally formed stud 86 which radially projects from said bearing 88 and which normally rests upon the longer free end of lever 84, and at an incline or obliquely thereto as is seen in full lines in Figs. 1 and 2, for the purpose hereinafter described.

Keyed to one end of shaft 16 is bar 81, the opposite end of which is pivotally connected as at 88 to the bifurcated end 89, which is afiixed to the upper end of rod 90. The latter rod is integrally formed with stop 9| and core 92. Said core 92 is positioned centrally of solenoid'll and is adapted for vertical shifting movement there within. As is obvious, when said solenoid is energized when the electric circuit, shown in Fig. 6, is completed through contacting contacts 54 and 68, said core 92, due to the magnetic action of said solenoid I I, will be caused to shift downwardly, shifting therewith rod 90* for angular shifting movement of bar 81 for rocking shaft 16. Stop 9| constitutes means for limiting the maximum shifting movement of said core 92', asthe former comes in contact with the upper end of solenoid I I.

The Shfting movement of said bar 81, as aforesaid, will cause rotary movement of gears TI, which in turn will impart rotation to pinions l9 and their bearings 80 into opposite direction, effecting in turn angular shifting movement of studs 86 from their inclined, oblique position to the vertical position indicated by dotted lines in Fig. 1. This angular shifting movement of studs 86 will exert downward pressure upon the outer ends of levers 84 for shifting the same upon their pivots 83, for elevating the inner ends of said levers 84, including their extensions 85, for actuating bearings I! in an upward direction, and against the tension of springs 24, and to the position indicated by dotted lines in Fig. I. The upward shifting movement of said bearings I! will simultaneously shift bodily shaft 25 and roller 26, but will not disconnect gears 27, the latter continuing in engagement by their teeth. because the elevation of bearings I1 and roller 26 is only to a fraction of an inch not suhicient to disengage teeth in the two gears 21.

The upward shifting movement of bearings H by levers 84 is effectuated against the tension of springs 24, sockets 23 being of course deeper than the reduced lower ends 22- of said cylindrical bars 2| permitting upward shifting of bearings I'I. When however studs 85 release the pressure upon levers 84, from the position shown in dotted lines in Fig. 1, springs 24, exerting tension upon the upper ends of bearings I'I, bring the same back to normal position, with roller 26. It is observed however, that levers 84 are actuated for elevating bearings I I for separating roller 26 from roller I5 only at the time when solenoid I I is energized, and then only when contacts 54 and 68 have directly been brought together. However; as long as paper is fed to rollers I 5 and 26, the same acts as insulation between said. contacts 54 and 68, preventing completion of the electric circuit. It is only when the paper ceases to be fed to said rollers I5 and 26 that gap between contacts 54 and 68 is removed to bring them directly together for completing electric circuit to energize solenoid H and thereby to actuate shifting of levers 84 for separating the two rollers.

From the hereinabove description it will be seen that when paper ceases to be fed towards rollers I5 and 26 and electric circuit is completed to energize solenoid II, due to the action of cam 28 on bar 30, roller 26 is raised upwardl and separated from roller I5 by the action of levers 84 upon bearings I'I. Ordinarily such separation would continue only for a brief period of time, equivalent to the time required for riser 29 to pass past idler 3!. Measured in terms: of the revolution of roller 26. that interval during which said roller 25 would remain raised and separated from roller I5, would be equivalent to a fraction of the revolution of said roller 26, and during the remainder of its revolution, said roller 26 would remain in contact with roller I5. To

obviate this result, and to bring about a longer:

separation of roller 26 from roller I5 during each revolution of said roller 26', and consequentlyto bring about contact between the two rollers dur-. ing each revolution thereof, and for a brief period of time, so as to condition said rollers to grasp paper as the same is fed therebetween anew, suitable mechanism, best shown in Figs. 2 and 3 is provided. That mechanism includes support 93 affixed in any suitable manner to the outer face of one of standards II. Hingedly connected by pivot 94 to the outer end of support 93 is a vertically disposed bar 95, having at its lower end and above support 93' a regulatingscrew 96' passing through said bar 95 and bear ing against stop 97 upwardly extending from said support 93. Said screw 96 and stop 91 regulate orlimit the maximum degree of shifting of said bar 95 towards standard II. Coil spring 98 affixed to plate I9 and pin 99, the latter extending" from the upper end of said bar 95, normally urges said bar 95 towards standard II. Substantially in its central portion said bar 95 has a transverse recess I00 made therein at a point which is substantially in alinement with the lowermost position of bar 81 when the latter is brought to that position by the action of solenoid 'II as hereinabove described. As soon as bar 81 is shifted to its lowermost position and comes in alinement' with recess I00, by virtue of the action of spring 98 upon bar 95, bar 81 finds itself within recess I00 and thereby is locked to said bar,95 the position illustrated by dotted lines in Fig. 3.

Coil spring IOI attached to standard II and bar 8! normally maintains said bar 81 in its inoperative elevated position, shown in full lines in Fig: 2, and brings the same to that latter position when solenoid H has been (fie-energized.

Aflixed to the outer adjacent end of shaft 25 is wheel I92 carrying upon its face cam mg I 03, which is positioned adjacent the rim of said wheel I92, and which, by its inclined face, rides upon the inner edge of bar 95', and adjacent the upper end of the latter, as said wheel I02 rotates, for the purpose of tripping said'bar 95 and of shifting the same against the tension of spring 98', for freeing bar 81 from its locked engagement by bar 95 and from its recess I00. Once said recess I is brought out of the pathof the upright shifting movement of bar 81, by action of cam lug I03, as it strikes the upper end of" bar 95, said bar 8'! automatically shifts upwardly due to the action of spring I9I, and brings said bar to its inoperative position shown in full lines in Figs. 2 and 3.

The action of cam lug !93 upon bar to release the same from its engagement with bar 07, is timed with the action of cam 28 upon bar 30. When the electric circuit has been completed through contacts 54 and 68, in the absence of the paper therebetween, and solenoid II is energt'zed with bar 81 shifted downwardly to the position indicated by dotted lines in Figs. 2 and, 3 and against the tension of spring I 9|, roller 26 becomes elevated and separated from roller [5. At that very instant when said bar 8'!- has been brought to its downwardly shifted position, bar 95- instantaneously engages the same as hereinabove described. At that moment cam lug I93 remains in a position past said bar 95. Therefore the engagement between bars 95 and 81 will continue during almost entire revolution of wheel I52 and thereby of roller 29 until wheel 82 com pletes its revolution and cam lug I03 is brought in contact with bar 95 to deflect the same from its engagement with bar 81. When this action takes place bar 81 instantaneously shifts upwardly by action of spring I9I, thereby actuating levers 84 to release their hold upon bearings I! for shifting the same downwardly and thereby bringing roller 25 in contact with roller I5. This contact between the two rollers is of comparatively brief duration, during each revolution of rollers I and 26, and continues only until rise 29 of cam 28 is again in contact with idler 3| to shift contact 54 towards contact 58 for completing electric circuit and energizing solenoid II. It will therefore be seen that in the absence of paper between contacts 54 and 63 action of rise 29 upon idler 3| brings about the completion of the electric circuit and energizing of solenoid 'II, by shifting contact 54 in contact with contact 68, which action takes place once during each revolution of roller I5, and thereby once during each revolution of roller 26. Action of bar 95 upon bar 81 maintains roller 26 in a separated relation with roller I5 during the major portion of the rotation of said rollers and cam lug H13 releases the engagement between said bars 95 and 81 once during each revolution of said rollers I5 and 28, thereby bringing about contact between said rollers once during each revolution thereof. The action of rise 29 upon idler 3i is of course timed with the action of said cam lug I03 upon bar 95, namely when cam lug I93 strikes bar 95 rise 29 is out of contact with idler 3|.

From the hereinabove description it will be seen that when no paper is fed towards rollers I5 and 26, said roller 26 is separated from roller I5 during the major portion during each single revolution, with roller 26 brought in contact with roller I5 for a brief interval of time during each revolution of said rollers, for the purpose of conditioning the two rollers for grasping the paper when the same commences to be fed therebetween anew. It follows that in the absence of paper shifted between contacts 54 and 58 bar 87 is shifted downwardly and into a locked engagement with bar 95 by the action of rise 29 upon idler 3|, also once during each revolution of rollers I5 and 26. However, said bar 87 is maintained in a downwardly shifted position and in locked engagement with bar 95, not by virtue of solenoid H and consequently not by virtue of action of rise 29 upon idler 3!, but by virtue of the action of spring 98 in maintaining said bar 95 in engagement with said bar 87. This engagement continues almost through the entire single revolution of roller 26 when the latter is in an elevated position and separated from roller I5. It is only during a brief period of time during each single revolution of roller 26 that the same is brought in contact with roller I5, and that contact between the two rollers is brought about by the action of cam lug I03 upon bar 95 for releasing the same from engagement with bar 31 and for permitting said bar 81 to shift upwardly due to the action of spring IOI. As stated, when bar 81 shifts upwardly and out of engagement with bar 95, solenoid 'II remains de-energized, because at that particular moment rise 29 of cam 28 is out of engagement with idler 3|, and therefore contacts 54 and 68 are not in contacting position.

From the hereinabove description it will be seen that by the action of cam 28 upon bar 99, by the action of spring IBI, as well as by the action of bar 95 and cam lug I93, bar 81 is inter mittently angularly shifted, downwardly during the major portion of each revolution of rollers I5 and 26, and upwardly during a brief period of the revolution of the said rollers, for the purpose of bringing roller 26 in contact with roller I5 for a short interval of time during each revolution of said rollers, all in the absence of a paper sheet between the contacts 54 and 68.

As hereinabove stated the teeth of gear wheels 2! are at all times in mesh, regardless whether rollers I5 and 26 are in contact or not, thereby transmitting constant rotation to roller 26 as well as to wheel I02.

While there is described herein a preferred embodiment of the present invention, it is nevertheless to be understood that minor changes may be made therein without departing from the spirit and scope of the invention as claimed.

What I claim as new is:

1. In a printing machine having a pair of printing rollers, towards and between which a paper sheet is fed, said rollers being set upon shafts, means for separating the rollers in the absence of paper sheet comprising a pair of contacts positioned in the path of the paper sheet as the same is shifting towards said rollers, a bar supported upon one of said shafts, a cam carried by one of said shafts for intermittently shifting said bar, a rocker shaft, a rod connected with said rocker shaft, one of said contacts being carried by said rod, said bar and said rocker shaft being connected for imparting rocking movement to the contact carried thereby for moving the same to or away from the other of said contacts by the action of said cam on said bar, a solenoid, said solenoid and said contacts being connected in an electric circuit for energizing said solenoid when said contacts come together in the absence of paper sheet therebetween, and means associated with the second-mentioned shaft and actuated by said solenoid when energized for causing shiftingof the other of said rollers by the action of the solenoid away from the first of said rollers.

2. In a printing machine, a pair of standards, a roller set by its shaft within said standards for rotary movement, bearings positioned within said standards for shifting to or away from said roller, a shaft journaled within said bearings, another roller set upon said shaft, the two rollers normally contacting for continuously receiving sheet of paper therebetween, a pair of contacts positioned in the path of paper as it shifts towards said rollers, a solenoid, said electric contacts and said solenoid being connected in an electric circuit, means operated by the first-mentioned shaft for intermittently bringing said contacts to or away from each other, in the absence of paper sheet said contacts being adapted to complete an electric circuit when brought together for the purpose of energizing said solenoid, and means associated with the second-mentioned shaft and operable by said solenoidwhen energized for causing shifting of said bearings away from said first named roller by the action of the solenoid for sep arating the two rollers.

3. In a printing machine, a pair of standards, a roller set by its shaft within said standards for rotary movement, bearings positioned within said standards for shifting to or away from said roller, a shaft journaled within said bearings, another roller set upon said shaft, the two rollers normally contacting for continuously receiving sheet of paper therebetween, a pair of contacts positioned in the path of paper as it shifts towards said rollers, a solenoid, said electric contacts and said solenoid being on an electric circuit, means for intermittently bringing said contacts to or away from each other, a lever pivoted within each of said standards, by its inner end said lever eontacting with each of said bearings,- in the absence of paper sheet said contacts being adapted to complete an electric circuit for energizing said solenoid, and means actuated by said solenoid when energized and ass'oiatd with the oppesite end of each of said levers for angularly shiftin said levers by tli action of' the solenoid for shifting said bearings away fromsaid first named roller for separating the two rollers.

4. In a printing machine, a pair of rollers, towards and between which a paper sheet is fed, a pair of contacts in the path of the paper as the same shifts towards said rollers, means for intermittently shifting said contacts to or away from each other, once during each revolution of said rollers, a solenoid, said solenoid and said contacts being connected in an electric circuit, in the absence of paper sheet between said contacts said solenoid being adapted to be energized when said contacts are brought together, a pair of bearings within which the shaft of one of the said rollers is journaled, said bearings being adapted to shift to or away from the other of said rollers, a lever contacting said bearings for normally maintaining said rollers in contact with each other, a bar in association with said lever and in contact with said solenoid, said bar being adapted for shifting movement by the action of said solenoid when energized for actuating said lever for shifting said bearings away from said first named roller for separating the same, and means operable independently of said solenoid for maintaining said bar in its shifted operative position during the maj or portion of the revolution of said rollers.

5. In a printing machine, a pair of rollers, towards and between which a paper sheet is fed, a pair of contacts in the path of the paper as the same shifts towards said rollers, means for intermittently shifting said contacts to or away from each other, once during each revolution of said rollers, a solenoid, said solenoid and said contacts being connected in an electric circuit, in the absence of paper sheet between said contacts said solenoid being adapted to be energized when said contacts are brought together, a pair of bearings within which the shaft of one'of the said rollers is journaleol, said bearings being adapted to shift to or away from the other of said rollers, a lever contacting said bearings for normally maintaining said rollers in contact with each other, a bar in association with said lever and in contact with said solenoid, said bar being adapted for shifting movement by the action of said solenoid when energized for actuating said lever for shifting said bearings away from said first named roller for separating the same, and means operable independently of said solenoid for maintaining said bar in its shifted operative position during the major portion of the revolution of said rollers, said last named means including a locking bar engaging said first named bar when the same is in a shifted operative position when brought to that position by said solenoid when energized, said locking bar engaging said first named bar during the major portion of the revolution of said rollers, and a cam device for disengaging said locking bar from said first named bar, said cam device being operable once during each revolution of said rollers.

6. In a printing machine, the combination of a pair of printing rollers adapted to receive a .paper' sheet therebetween, shafts mounting said rollers, means mounting one of said shafts for bodily movement of the roller thereon toward and from the coacting roller on the other shaft and including bearings and levers .pivotally mounted and supporting the bearings thereon for bodily shifting movement upon sv'ving ing action of said levers,- electrically operated means operativeiy' connected with said levers and causing shifting of the levers by the action of the electrically operated means to cause a shifting movement of said first-mentioned roller, electric circuit closing devices connected with said electrically operated means for energizing said means upon the failure of feeding of a paper sheet to the rollers, and means actuated by the secondmentioned shaft for operating said circuit closing devices.

7. In a printing machine, the combination of a pair of printing rollers adapted to receive a paper sheet therebetween, shafts mounting said rollers, means mounting one of said shafts for bodily movement of the roller thereon toward and from the coacting roller on the other shaft and including bearings and levers pivotally mounted and supporting the bearings thereon for bodily shifting movement upon swinging action of said levers, means including a solenoid for operating said levers to cause separating action of said first-mentioned roller, a pair of electric contacts arranged in the path of feeding of the sheet and connected in an electric circuit with the solenoid for controlling the action of said solenoid, and means actuated by the secondmentioned shaft for causing relative closing movement of the contacts to close the circuit to the solenoid in the absence of a paper sheet between the contacts.

8. In a printing machine, the combination of a pair of coacting printing rollers adapted for the feeding of a paper sheet therebetween, shaftsmounting said rollers, means mounting one of said shafts for bodily movement of the roller thereon relative to the roller on the other shaft in separating action, and means for causing movement of said mounting means for relative separation of the rollers including electrically actuated means for causing relative shifting of the rollers by actuation of said electrical means, a pair of contacts positioned in the path of the paper sheet and electrically connected with said electrically actuated means, an arm supporting one of said contacts for movement toward and from the other, supporting means for said arm for causing rocking movement thereof, and means for operating said arm including a rod mounted for longitudinal movement, and a cam mounted on the second-mentioned shaft and having operative relation with said rod for actuating the rod to cause circuit closing movement of the contacts in the absence of a paper sheet therebetween.

9. In a printing machine. the combination of a pair of printing rollers adapted to receive a paner sheet thereb tween, shafts mounting said rol rs. me ns mounting one of sa d shafts for b dily movement of the roller thereon toward and from the coacting rol er on the other shaft and including bearings and levers pivotal y mounted and suppor ing the bearings thereon for bodily shifting movement u on swing ng action of said levers. means includ ng a sol noid for operating sai l vers to cause separatin action of said firstmen io ed roller. a pai o electric contacts arranged in the path of feeding of the sheet and connected in an electric circuit with the solenoid 11 for controlling the action of said solenoid, an arm supporting one of said contacts for movement toward and from the other contact, supporting means for said arm for causing rocking movement thereof, and means for operating said arm and actuated by the second-mentioned shaft to cause circuit closing movement of the contacts in the absence of a paper sheet therewith.

GEORGE BABICZ.

REFERENCES oI'rED The following references are of record in the file of this patent:

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