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Publication numberUS3430946 A
Publication typeGrant
Publication dateMar 4, 1969
Filing dateDec 19, 1966
Priority dateDec 19, 1966
Also published asDE1611241B1
Publication numberUS 3430946 A, US 3430946A, US-A-3430946, US3430946 A, US3430946A
InventorsCarl O Siebke
Original AssigneeMiller Printing Machinery Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Sheet tensioning and transfer mechanism for presses
US 3430946 A
Images(3)
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Description  (OCR text may contain errors)

March 4, 1969 c. o. SIEBKE 3,430,946

SHEET TENSIONING AND TRANSFER MECHANISM FOR PRESSES Filed Dec. 19, 1966 Sheet of 5 m newm/a 641% 0. S/EBKE Sheet 2 o f CvO. SIEBKE SHEET TENSIONING AND TRANSFER MECHANISM FOR PRESSES March 4, 1969 Filed'Dec. 19, 1966 5.5, E. J I RTFM 1 sh E wh 3 QM 3 6m 3 h M Q g Q Q 9 Qh Q 9 QWQ QWW sh \N sg. Q as March 4, 1969 c. o. SIEBKE 3,430,946

SHEET TENSIONING AND TRANSFER MECHANISM FOR PRESSES Filed Dec. 19, 1966 Sheet 3 of 3 w in? ATTORNEY United States l atent C 3,430,946 SHEET TENSIONING AND TRANSFER MEQHANISM FOR PRESSES Carl 0. Siebke, Pittsburgh, la, assignor to Miller Printing Machinery (30., Pittsburgh, Pa, a corporation of Pennsylvania Filed Dec. 19, 1966, Ser. No. 602,857

US. Cl. 271-51 20 Claims Int. Cl. 1365b 5/12, 5/14 ABSTRACT OF THE DISCLOSURE Apparatus in a rotary press sheet transfer cylinder for pulling a sheet taut on the outer surface or periphery of the cylinder. Suction devices positioned on the periphery of the cylinder are secured to arm members that are in turn secured to an actuating shaft supported within the cylinder. The trailing edge of the sheet to he transferred is engaged by the suction devices and the shaft with the arms secured thereto is rotated to pull the sheet taut over the peripheral surface of the cylinder.

BACKGRCUND OF THE INVENTION Field of the invention This invention relates to a sheet handling device for holding and tensioning a sheet on a cylinder and more particularly to a sheet handling device for tensioning a paper sheet on the outer surface of a printing press transfer cylinder.

Description of the prior art In the past, as described in Patent No. 2,757,610 to Gegenheimer et al. entitled Sheet Handling Mechanism and Method for Multi-Color Perfector Press, granted Aug. 7, 1956, the transfer cylinder of a rotary press was provided with suction heads to hold the trailing edge of the paper sheet on the cylinder during rotation and transfer thereof. The suction heads were fixed relative to the cylinder and the paper sheet had to be delivered to the cylinder in a flat wrinkle free condition in order to transfer the sheet in a smooth and unwrinkled condition. There was no provision in Patent N0. 2,757,610 for tensioning the sheet of paper after it was positioned on the cylinder.

Patent No. 3,096,088. to Young entitled, Sheet Holding and Transfer Mechanism for Presses, granted on July 2, 1963, discloses apparatus for pulling and tensioning the sheet on the transfer cylinder by moving the suction heads along the periphery of the cylinder after the suction heads have engaged the trailing edge of the paper sheet. The suction heads are arranged to move on the cylinder peripheral surface in a direction away from the leading edge of the sheet and thus pull the sheet into a smooth and taut condition on the cylinder.

In the above discussed prior art patents to Young and Gegenheimer et al., the sheet transfer cylinder is provided with gripping means for receiving and gripping the leading edge of the sheet to be transferred. The suction heads on the peripheral or external surface of the cylinder are spaced from the gripping means a preselected distance so that the suction heads are beneath the trailing edge of the sheet. By applying a suction the trailing edge of the sheet is engaged by the suction heads and held on the cylinder. The suction heads of Young are urged by springs toward the gripping means. After the trailing edge of the sheet is in overlying relation with and secured to the suction heads by suction, the suction heads are moved away from the gripping means against the opposing force of the internal springs by suction. It is this movement of the suction heads that tensions the sheet and draws it taut over the surface of the transfer cylinder.

It is essential in pulling and tensioning the sheet on the external surface of the cylinder that all of the suction heads move away from the gripping means simultaneously and traverse the same distance in order to evenly tension the entire sheet on the transfer cylinder. Small variations in the resiliency of the internal springs within the suction heads may cause one or more of the suction heads to move sooner than the other suction heads or may cause the suction heads to move different distances relative to the gripping means. This results in the sheet being pulled or tensioned unevenly over the periphery of the cylinder.

Further, in Young the suction for engaging the sheet to the suction head and compressing the internal springs to move the suction heads is obtained from the same source so that the suction must be sufficient to engage the sheets to the suction heads and also sufficient to compress the internal springs and move the suction heads away from the gripping means. Using the same suction for both operations may also cause uneven tensioning of the sheet on the transfer cylinder. In addition, for certain types of paper, such as tissue paper, the suction required to compress the internal springs within the suction heads may be excessive. A fixed minimum suction is required to compress the internal springs within the suction heads. This minimum suction may exceed the strength of the tissue paper to the extent that the tissue paper is damaged when subjected to this excessive suction through the suction heads. If the suction is reduced to prevent damage to the tissue paper, insufiicient suction is present to compress the internal springs and properly tension the sheet of tissue paper on the transfer cylinder.

SUMMARY OF THE INVENTION The present invention eliminates the above discussed problems by providing a mechanical means for moving the suction heads away from the gripping means for tensioning the sheet on the transfer cylinder. The suction applied to the suction heads is solely for engaging the sheet to the suction head. Where tissue or fragile paper is being processed the suction can be reduced to a minimum that does not damage the paper and the mechanical means, independent of the suction pressure, is operable to move the suction heads away from the gripping means. The suction heads are all interconnected to the mechanical means and move simultaneously the same distance along the cylinder periphery to thereby apply an even tension to the sheet.

Briefly, the present invention provides a sheet transfer cylinder having gripping means for receiving and gripping the leading edge of the sheet to be transferred. A sheet engaging device having suction heads on the periphery of the cylinder is operable to engage the trailing edge of the sheet by suction. The sheet engaging device is movably mounted within the body of the cylinder so that the suction heads are movable along the periphery of the cylinder toward and away from the gripping means. A mechanical means including an actuator positioned externally of the cylinder is arranged to move the sheet engaging device so that the suction heads move toward the gripping means to engage the trailing edge of the sheet and thereafter move the sheet engaging device so that the suction heads move away from the gripping means to draw the sheet taut over the outer surface or periphery of the cylinder.

Accordingly, it is the principal object of the present invention to provide a mechanically actuated device for moving a sheet engaging member toward and away from the gripping means to thereby evenly tension the sheet on the periphery of the cylinder.

Another object of this invention is to connect a plurality of sheet engaging members to each other so that all of the sheet engaging members will simultaneously move away from the gripping means along the periphery of the cylinder.

Another object of this invention is to provide a suction type sheet engaging member in which the sole function of the suction is to engage the sheet to the sheet engaging member.

These and other objects and advantages of this invention will be more completely disclosed and described in the following specification, the accompanying drawings and the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS In the drawings:

FIGURE 1 is a schematic end view of a second transfer cylinder illustrating a paper sheet on the second transfer cylinder after the second transfer cylinder has received the sheet from a first transfer cylinder. The suction heads are in a first position away from the grippers and abutting a stop member.

FIGURE 1A is a view similar to FIGURE 1 illustrating the second transfer cylinder rotated on its axis to a position where the suction heads have moved to a second position toward the grippers and spaced from the stop member.

FIGURE 2 is a view similar to FIGURE 1A illustrating the second transfer cylinder further rotated on its axis to a position where the suction heads engage the trailing edge of the sheet. The paper sheet is illustrated with several wrinkles therein.

FIGURE 3 is a view similar to FIGURE 2 illustrating the second transfer cylinder still further rotated on its axis with the suction heads engaging the trailing edge of the sheet with the suction heads moved back to the first position away from the grippers. The movement of the suction heads away from the grippers has removed the wrinkles illustrated in FIGURE 2.

FIGURE 4 is a developed view of the transfer cylinder taken along the line 44 in FIGURE 5 illustrating the sheet engaging device and the mechanical actuation therefor.

FIGURE 5 is a fragmentary end view in elevation of the transfer cylinder illustrating the mechanical actuating means for the sheet engaging device taken generally along the line 5-5 in FIGURE 4.

FIGURE 6 is a view in side elevation of one of the sheet engaging vacuum arms.

FIGURE 7 is a plan view of the suction head secured to the top portion of the vacuum arm.

FIGURE 8 is a view in front elevation of a sheet engaging vacuum arm mounted on a support shaft having a passageway therethrough.

FIGURE 9 is a side view in elevation taken along the line 99 in FIGURE 4 illustrating the cam disc for rotating the vacuum arms and actuating the suction valve. The cam disc is mounted on the frame of the rotary press.

FIGURE 10 is a developed view of the cam surface for actuating the suction valve illustrated in FIGURE 9.

FIGURE 11 is a side view in elevation illustrating one of the shaft supporting discs taken generally along the line 1111 in FIGURE 4.

FIGURE 12 is a view similar to FIGURE 5 illustrating another embodiment of an actuating means for the sheet engaging vacuum arms.

FIGURE 13 is a side view in elevation of an actuating disc having contact surfaces for the actuating means illustrated in FIGURE 12.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings and particularly to FIGURES 1-3 there is shown schematically an end view of a second transfer cylinder generally described by the numeral 10. The transfer cylinder 10 is supported and mounted for rotation in the frame of a rotary press on shaft 12. Two sets of gripper fingers are shown generally at 14 and 16 mounted on the periphery of the cylinder 10 to grip the leading edge of a sheet to be transferred by the transfer cylinder 10. Two sets of suction heads shown generally at 18 and 20 are movable along the periphery of the cylinder for engaging the trailing edge of the sheets to be transferred. Suction heads 18 and 20 are mounted on sheet engaging vacuum arms generally designated by the numerals 22 and 24 which are in turn nonrotatably secured to vacuum arm shaft generally designated 26 and 28 respectively. Vacuum arm shafts 26 and 28 are supported by the second transfer cylinder 10 and have an axis parallel to and spaced from the cylinder axis of rotation.

The general operation of the transfer cylinder in engaging and tensioning a sheet is as follows. As the transfer cylinder 10 rotates on its axis in the direction of the arrow in FIGURE 1, the leading edge 30 of a sheet 32 that is to be transferred by the cylinder 10 is taken from a first transfer cylinder 34 by the gripper fingers 14 in the manner described in Patent No. 2,757,610, included herein by reference, and transferred to the transfer cylinder It). In the position illustrated in FIGURE 1, the vacuum arms 24 abut stop members 132 and the suction heads 20 are in a first position away from the gripper fingers 14.

In FIGURE 1A, the second transfer cylinder 10 has rotated about its axis to a position where the vacuum arms 24 have moved toward the grippers 14. The trailing edge 36 of sheet 32 is not as yet in overlying relation with the suction heads 20. The suction heads 20 have moved toward the grippers 14 by rotation of the shaft 28 in the direction of the arrow in FIGURE 1A.

In FIGURE 2, the second transfer cylinder 10 has further rotated about its axis from the position illustrated in FIGURE 1A and the trailing edge 36 of sheet 32 is in overlying relation with the suction heads 20. Suction is applied to the suction heads at approximately the position illustrated in FIGURE 2 to engage the trailing edge 36 of the sheet 32 to the respective suction heads 20. The sheet 32 may have a nonplanar configuration and contain wrinkles generally designated by the numerals 38 and 40.

After the trailing edge of the sheet is engaged by the suction heads 20, on further rotation of the second transfer cylinder 10, as illustrated in FIGURE 3, the shaft 28 is rotated in the direction of the arrow in FIGURE 3 opposite to the direction illustrated in FIGURE 2. This rotation of shaft 28 moves the suction heads 20 along the periphery of cylinder 10 away from the grippers 14 to thereby pull the sheet 32 by the trailing edge 36 taut over the periphery of the cylinder 10 and removes the wrinkles 38 and 40 previously present in the sheet 32. The rotation of shaft 28 first in one direction and then in the opposite direction occurs while the cylinder 10 is rotating in one direction about the axis of shaft 12.

EMBODIMENT IFIGURES 41l FIGURES 4-11 illustrate one embodiment of the mechanical actuating mechanism for moving suction heads 18 and 20. FIGURE 4 is a developed section and illustrates one set of vacuum arms and one set of gripper fingers which for convenience will be generally referred to, respectively, by the numerals 16 and 18. In the No. 2 transfer cylinder of a multi-color and perfector press, as described in Patent No. 2,757,610, there are two sets of gripper fingers and two sets of suction heads. It should be understood, however, the hereinafter described invention is applicable to sheet handling devices having one or more sets of gripper fingers and one or more sets of suction heads.

In FIGURE 4, the shaft 12 of transfer cylinder is of tubular construction and is mounted for rotation in journals 42 and 44 in frame members 46 and 48 respectively. Secured to the tubular portion of main shaft 12 are a plurality of spaced sheet supporting discs generally designated by the numeral 50 that have a hub portion 52 and radially extending disc like spokes or web portions 54. The web portions 54 have radial flanged sheet supporting end portions 56 that are arranged to support the paper sheet. The external surface of the cylinder sheet supporting portions 56 form the outer periphery of the transfer cylinder 10".

The sheet supporting disc web portions have elongated semicircular openings 58 therein to permit adjustment of the vacuum arm shaft 26 toward and away from the gripper fingers 16 as will be later described.

Also supported on the tubular portion of main shaft 12 are a plurality of shaft supporting discs generally designated by the numeral 60 (FIGURES 4 and 11) and each has a hub portion 62 secured to the main shaft 12. Disc like web portions 64 extend radially from the hub portion 62 and have flanged radial sheet supporting peripheral segments 66 that are also arranged to support the sheet on the transfer cylinder outer surface. The sheet supporting segments 66 are in the same cylindrical plane as the sheet supporting surfaces 56 of sheet supporting discs 50.

The shaft supporting discs 60- have aligned passageways 68 therethrough in which bearings 70 are positioned. The vacuum arm shaft 26 extends through the axially aligned passageways 68 and is rotatably supported by the bearings 70. The web portions 64 of certain of the shaft supporting discs 60 have aligned passageways 72 for a valve actuator shaft and passageways 74 and 76 for air and suction conduits later described. The shaft supporting discs 60 are adjustable on the shaft 12 to move the suction heads 18 and toward or away fiom the grippers 14 and 16 so that the suction heads 18 and 20 may be positioned beneath the trailing edge of paper sheets having different lengths.

The vacuum arm shaft 216 has a plurality of vacuum arms generally designated by the numeral 22 secured thereto and rotatable therewith. One of the vacuum arms 22 is illustrated in detail in FIGURES 6, 7 and 8 and includes a body portion 78, a hub portion 80 and a suction head receiving end portion 82. The suction head receiving portion 82 has an upper suction head receiving surface 84 and a bottom surface 86. A passageway 88 extends from the bottom surface 86 through the suction head receiving end portion 82 to the upper surface 84. The suction head 18 has a perforated or foraminous top surface 92 and is secured to the suction head receiving portion top surface 84 by screws 94. The suction head 18 has a chamber 96 connected to the passageway 88 in the vacuum arm end portion 82 so that the chamber 96 may be. evacuated by applying a suction or vacuum to the passageway 88 or air under pressure may be supplied to chamber 96 through passageway 88 as will be later described. The suction heads 18, for convenience of description, are called suction heads although it should be understood the heads 18 also serve as blower heads.

The suction head end portion 82 also has a bore 98 therethrough normal to and intersecting passageway 88. A manually rotatable valve 100 is positioned in bore 98 and is operable to open and close passageway 88. The valve 100 is locked in position by a spring 102 secured to the suction head receiving end portion 82 by a screw 104. A flexible conduit 106 is connected at one end to the passageway 88 in the suction head receiving end portion 82 and at the other end to an opening 108 in the vacuum arm shaft 26. The vacuum arm shaft 26 has an axial bore 110 that is connected to the conduits 106 at the openings 168. Air or suction is provided for the suction heads 18 through the axial bore 110 in vacuum arm shaft 26 as later described.

As is apparent from FIGURES 4 and 11, the axis of the vacuum arm shaft 26 is spaced radially from the axis of the transfer cylinder main shaft 12 and is parallel thereto. The vacuum arm shaft 26 is also spaced inwardly from the periphery of the transfer cylinder 10 and the vacuum arms 22 extend radially toward the periphery of the cylinder 10 with the suction heads 18 positioned in the same plane as the sheet supporting surfaces of the discs 50 and 60.

Secured to the end of cylinder main shaft 12 adjacent the frame 48 is a support member 112 that it rotatable with the cylinder 10. The support member 112 has an annular body portion 113 with a radially extending support portion 114. The vacuum arm shaft 26 has an end portion 116 extending through a passageway 118 (FIG- URE 4) in the radially extending support portion 114 .and is rotatably supported therein. An actuating lever 120 is nonrotatably secured to the vacuum arm shaft end portion 116 and is operable to rotate the vacuum arm shaft 26 in the support passageways 118 and 68. A cam roller 122 is rotatably connected to the end of lever .120. The lever 120 has a pin 124 connected thereto and loosely positioned in a bracket 126 secured to the annular member 112. A spring 128 is positioned around pin 124 and urges the lever away from the annular member 112. The spring 128 exerts a force on the end of lever 120 to rotate the vacuum arm shaft 26 in a clockwise direction as viewed in FIGURES 5 and 11. Each of the shaft supporting discs 60 has a radially extending stop portion 130 with an adjustable stop member 132 positioned therein. The spring 128 through lever 120 and vacuum arm shaft 26 urges the vacuum arms 22 against the end of stop member 132 to thereby maintain the suction heads 18 in a position away from the grippers 16. By rotating the vacuum arm shaft 26 through lever 120 in a counterclockwise direction, as viewed in FIGURES 5 and 11 the suction heads 18 are moved in a direction toward the grippers 16.

Referring to FIGURES 4 and 9, a cam disc .134 is secured to the inner surface of frame 48 and has a radially inwardly extending cam segment 136 with a cam surface 138. The cam roller 122 (FIGURES 4 and 5) on the end of lever 120 is arranged to contact the cam surface 138 during rotation of the cylinder 10 to move lever 120 in a direction to compress spring 128. The cam surface 138 thus through cam roller 122, lever 120 and vacuum arm shaft 26 moves the suction heads 18 on vacuum arms 22 toward the grippers 16 a preselected distance. This distance is controlled by the shape and dimensions of the cam 136.

The mechanism for applying suction to the suction heads 18 is illustrated in FIGURE 4. The intermediate shaft support disc 60 has a valve housing 140 with an air port 142 and a vacuum or suction port 144. An air pressure conduit 146 is connected to the air port 142 and is supported in the shaft supporting discs 60 and extends through a passageway 148 in the radially extending portion 114 of support member 112. A suction conduit 150 is connected to the suction port 144 and extends through a similar passageway 152 in the support member 112. An annular rotary valve generally designated by the numeral 154 is mounted on the shaft 12 and has a rotatable portion 156 secured to and rotatable with the cylinder 10 and a fixed portion 158 connected to the frame member 48 by a pin 160. The conduits 146 and 150 have their end portions connected to the rotatable portion 156. The rotatable portion 156 and fixed portion 158 have annular recessed portions 162 and 164 that communicate with the respective air and suction conduits 146 and 150 through suitable passageways in the valve rotatable portion 156. A source of suction such as a conventional vacuum pump (not shown) is connected through conduit 166 to the valve fixed portion 158 and is arranged to provide a suction through annular passageway 162 to the suction conduit 150. There is a similar source of air under pressure (not shown) connected to a conduit 168 (FIGURE that supplies air under pressure through suitable passageways in the valve fixed portion 158 to annular passageway 164 and air conduit 146. With this arrangement, air under pressure is provided in conduit 146 and a suction is provided in conduit 150. Suitable annular seal means are positioned between the fixed and rotatable portions of valve 154 to seal the respective annular passageways 162 and 164.

The valve 140 has a chamber 168 connected to air port 142 and suction port 144. There is an outlet port 170 in valve housing 140 that communicates with the axial bore or passageway 110 in the vacuum arm shaft 26. A rod-like valve member 172 is positioned in chamber 168 and is arranged to alternatively connect outlet port 170 with air port 142 or suction port 144. The rod-like valve member 172 is connected to a rod 174 that is supported in the shaft supporting discs 60 and has an end portion connected to an actuator 176 supported in a passageway 178 in the radially extending portion 114 of support member 112. The valve 172 has .a spring member 180 that normally biases the valve member to a position where the air port 142 is connected to outlet port 170. By moving the rod axially against the spring 180 (as is illustrated in FIGURE 4), the airport 142 is closed and the suction port 144 is connected to the outlet port 170. The rod 174 is arranged to move axially to connect the respective air and vacuum ports 142 and 144 to the outlet port 17 0. The actuator 176 supported in support member 112 has a cam roller 182 on its end portion.

The actuator for valve 140 is a semicircular cam segment 184 on cam disc 134 illustrated in FIGURES 9 and 10. The cam segment 184 has a cam surface 186 that extends inwardly toward the transfer cylinder 10. FIG- URE is a developed view of the cam segment 184 and illustrates the inwardly extending raised cam surface 186. Upon rotation of the cylinder 10, the roller 182 rotatably secured to valve actuator 176 contacts the cam surface 186 and moves the valve rod 174 inwardly to the position illustrated in FIGURE 4 to connect the suction port 144 in valve housing 140 to the outlet port 170 and thus provide a suction for suction heads 18. It should be noted that the cam surfaces 186 and 138 are arranged in the same quadrant so that the suction head is subjected to a suction pressure when the lever 120 moves the vacuum arms 22 and suction heads 18 away from the grippers 16.

The vacuum arms 22 and their associated structure may be moved toward and away from the grippers to accommodate different sized sheets processed in the rotary press. A clamp screw (not shown) may be loosened to adjust the annular support member 112 (FIGURE 5) and the annular support member 112 with the associated structure positioned thereon may be rotated relative to the cylinder main shaft 12 with the vacuum arms 22 and their associated structure about the axis of main shaft 12 within the limits of the elongated semicircular openings 58 in the sheet supporting discs 50. A pointer 188 extends radially from the annular support member body portion 113 and cooperates with an index plate 190 mounted on the sheet supporting disc 50 adjacent the end of cylinder 10 to indicate the arcuate distance between the grippers 16 and the suction heads 18 on the periphery of the cylinder 10. This arcuate distance is equivalent to the length of the sheet that may be processed in the rotary press with the trailing edge of the sheet in overlying relation with the suction heads 18 when the front edge of the sheet is engaged by the grippers 16.

The transfer cylinder 10 is driven by drive gears 192, as illustrated in FIGURE 4 and the grippers 16 that are associated with the cylinder 10 are generally illustrated in FIGURE 4. There is also illustrated generally actuating mechanisms 194 for the grippers 16 and a cam 196 secured to the inner surface of frame 46 for opening and closing the grippers 16. The mechanism for rotating the transfer cylinder 10, the grippers and the arrangement for actuating the grippers is similar to that described in the Gegenheimer et al. Patent No. 2,757,610. The apparatus and method of operation illustrated and described in the Gegenheimer et al. Patent No. 2,757,610 is incorporated herein by reference.

EMBODIMENT IIFIGURES 12 AND 13 In FIGURES l2 and 13 there is illustrated an electromechanical device for moving the suction heads 18 toward and away from the grippers 16. FIGURE 12 is similar to FIGURE 5 and similar numerals will designate similar parts. A solenoid generally designated by the numeral 198 is supported by an extension of bracket 126. The solenoid 198 has a solenoid coil 199 and a cylindrical core or armature 200. The armature 200 is connected to lever by means of a pivot link 202. The solenoid 198 has a flange member 204 extending therefrom that supports a pair of brushes 206 and 208. The flange memher 204 is preferably resilient to urge the brushes 206 and 208 against contact surfaces on a disc 210 generally illustrated in FIGURE 13. Suitable conductors (not shown) connect the brushes 206 and 208 with the solenoid coil 199 so that current from brushes 206 and 208 will energize coil 199 creating a magnetic flux and pulling armature 200 inwardly in coil 199.

The disc 210 is similar to the cam disc 134 to the extent that cam member 184 is secured thereto and has a cam surface 186 similar to that illustrated in FIGURE 9 to actuate the valve member 172, as previously discussed. The disc 210 has appropriate circular contact surfaces 212 and 214 on which the brushes 206 and 208 ride upon rotation of cylinder 10. The contact surfaces 212 and 214 have appropriate electrically conductive portions 216 and 218 for the segment illustrated by the line A in FIGURE 13. The remainder of the contact surfaces are nonconductive surfaces.

As the cylinder 10 rotates, the brushes 206 and 208 remain in contact with the circular contact surfaces 212 and 214 and as the brushes traverse the electrically conductive portions 216 and 218, the brushes 206 and 208 complete an electrical circuit through surfaces 216 and 218 to energize the solenoid coil 199. When the coil 199 is energized, the core or armature 200 moves inwardly and rotates the lever 120 and vacuum arm shaft 26 in a counterclockwise direction, as viewed in FIGURE 12, to move the suction heads 18 toward the grippers 16 and further compresses spring 128 in a manner similar to that previously described. When the cylinder rotates to a position where the brushes 206 and 208 contact the nonconductive portions of contact surfaces 212 and 214, the spring 128 expands and rotates the lever 120, vacuum arm shaft 26 and vacuum arms 22 until the vacuum arms 22 abut the stop member 132 (FIGURE 11) and thus move the suction heads 18 away from the grippers 16.

OPERATION In operation, the transfer cylinder 10 is rotated at a preselected speed by the drive gears 192. The leading edge of the sheet that is transferred from the #1 transfer cylinder 34 (FIGURE 1) is engaged by the grippers 16 in the manner described in Patent No. 2,757,610. The grippers secure the leading edge of the sheet to the transfer cylinder 10 and the body of the sheet assumes the curvature of the transfer cylinder 10. The vacuum arms 22 and associated apparatus is adjusted relative to the grippers 16 by adjusting annular support member 112 so that the trailing edge of the sheet will be in overlying relation with the suction heads 18. Before the trailing edge of the sheet is in overlying relation with the suction heads 18, the cam roller 122 associated with lever 120 contacts the cam surface 138 on cam member 136 and rotates the lever 120, vacuum arm shaft 26 and vacuum arm 22 and moves the vacuum arms and suction heads toward the grippers 16 to a position similar to that illustrated in FIGURE 1A. The suction heads are moved toward the grippers 16 before the suction heads reach the common center line between the second and first transfer cylinders 10 and 34. The cam roller 1'82 associated with the valve actuator 176 then contacts the raised cam surface 186 on the semicircular cam member 184 to move the valve actuator 176 and valve stem 172 to the position illustrated in FIGURE 4 to thus connect the outlet port 170 with suction port 144 to provide a suction in suction heads 18. The suction heads are in approximately the position illustrated in FIGURE 2 when the suction is applied thereto. The trailing edge of the sheet is thus engaged by the suction heads 18 by suction.

While the sheet trailing edge remains engaged to the suction heads by the suction, the cam roller 122 moves off the cam surface 138 and spring 128 expands and rotates the lever 120 and vacuum arm shaft 22 in a clockwise direction to thereby rotate the vacuum arms 22 and move the suction heads 18 away from the grippers 16. The cam surface 138 is so arranged that the vacuum arms 22 move away from the grippers 16 a short time after the suction heads 20- have passed the common center line between the second and first transfer cylinders 10 and 34 as is illustrated in FIGURE 3. This movement of the suction heads 18 away from the grippers 1-6 by the expansion spring 128 while the trailing edge of the sheet is engaged by the suction heads 18, pulls the paper sheet engaged by grippers 16 taut on the surface of cylinder 10. The suction heads 18 remains in this latter position away from the grippers 16 under the force of spring 128 until again urged toward the grippers 16 by the cam actuated lever. Further rotation of cylinder 10 moves cam roller 182 associated with valve actuator 176 off of the raised cam surface 186 to move the valve 172 to open the air port 140 to outlet port 170. The positive air pressure exerted through the suction heads 18 disengages the trailing edge of the sheet from the suction heads. This latter operation is accomplished as the sheet is being transferred from the #2 transfer cylinder and is engaged by grippers on a subsequent transfer cylinder. As the transfer cylinder 10 picks up another sheet of paper, the above sequence is repeated thus tensioning each sheet as it is transferred by transfer cylinder 10.

With this arrangement, the amount of suction in suc tion heads 18 is determined by the engaging force required between the trailing edge of the paper sheet and the suction head. The mechanical actuating means i.e. cam 136, lever 120, vacuum arm shaft 26, vacuum arms 22 and spring 128, move the suction heads toward and away from the grippers 16 and is independent of the suction pressure in the suction heads 18. Because all of the vacuum arms 22 are fixedly secured to the vacuum arm shaft 26, all of the suction heads move simultaneously toward and away from the grippers 16 and move the same incremental distance along the periphery of the transfer cylinder 10. The sequence of subjecting the suction heads 18 to a suction and moving the suction heads toward and away from the grippers is controlled by the relative positions of the cam members 136 and 184. It should be understood that the cam arrangement could be such that the suction heads 18 would be moved away from the grippers 16 upon actuation by a cam surface and moved toward the grippers by another mechanical device.

The electromechanical actuating mechanism in FIG- URES 12 and 13 operates in a similar manner to the actuating mechanism illustrated in FIGURES 4-11. The lever arm is moved in a counterclockwise direction by means of the solenoid 198. The brushes 206 and 208 and the conductive contact surfaces 216 and 218 control the segment where the solenoid coil 199 is energized and the armature 200 is pulled into the coil 199 to move lever 120 and rotate the vacuum arm shaft 26. In the embodiment illustrated in FIGURES 12 and 13, the air suction valve is actuated by a raised cam mechanism 186. It should be understood, however, that the air-vacuum valve could also be actuated by a similar electrical device as that illustrated in FIGURE 12 for rotating lever 120.

According to the provisions of the patent statues, I have explained the principle, preferred construction, and mode of operation of my invention and have illustrated and described what I now consider to represent its best embodiments. However, I desire to have it understood that, Within the scope of the appended claims, the invention may be practiced othervvise than as specifically illustrated and described.

I claim:

1. A sheet handling device comprising:

a sheet transfer cylinder having gripper means for receiving and gripping the leading edge of a sheet to be transferred,

sheet engaging means extending toward the periphery of said cylinder adjacent the trailing edge of said sheet,

said sheet engaging means having a sheet engaging portion movable along the periphery of said cylinder operable to engage said trailing edge of said sheet,

first mechanical means operable to move said sheet engaging portion of said sheet engaging means away from said gripper means,

adjustable stop means on said cylinder to limit move ment of said sheet engaging means in a direction away from said gripper means,

second mechanical means operable to move said sheet engaging portion toward said gripper means,

said first mechanical means and said second mechanical means being operable to move said sheet engaging portion toward said gripper means for engaging the trailing edge of said sheet and thereafter moving said sheet engaging portion away from said gripper means while said gripper means engages said leading edge of said sheet to thereby draw said sheet taut over the periphery of said cylinder.

2. A sheet handling device as set forth in claim 1 in which said sheet engaging portion includes:

a suction head for engaging the sheet to be transferred,

valve means within said transfer cylinder,

conduit means connecting said valve means to said suction head,

cam actuated means controlling said valve means.

3. A sheet handling device as set forth in claim 1 in which:

said second mechanical means includes a lever means operable to move said sheet engaging portion of said sheet engaging means toward said gripper means.

4. A sheet handling device as set forth in claim 3 in which:

said lever means includes roller means rotatably secured thereto,

a cam member positioned adjacent to said cylinder,

said cam member having a cam surface fixed relative to said cylinder,

said roller means being operable to engage said cam surface and rotate said lever means to thereby move said sheet engaging portion toward said gripper means.

1 1 5. A sheet handling device as set forth in claim 3 in which:

said lever means includes electrically actuated means secured thereto, said electrically actuated means being operable to rotate said lever means to thereby move said sheet engaging portion toward said gripper means. 6. A sheet handling device as set forth in claim 1 in which:

said sheet engaging means includes a vacuum arm eX- tending to the periphery of said cylinder, said vacuum arm having a sheet engaging end portion movable along the periphery of said cylinder, said sheet engaging end portion being operable to engage said trailing edge of said sheet, said second mechanical means includes electrically actuated means to rotate said vacuum arm toward said gripper means. 7. A sheet handling device as set forth in claim 6 in which:

said electrically actuated means includes a solenoid coil secured to said cylinder with a movable core positioned therein, said core connected to said vacuum arm so that upon energization of said solenoid coil said core moves into said solenoid and rotates said vacuum arm to thereby move said vacuum arm sheet engaging end portion toward said gripper means. 8. A sheet handling device as set forth in claim 1 in which:

said first mechanical means includes resilient means urging said sheet engaging portion of said sheet engaging means away from said gripper means. 9. A sheet handling device as set forth in claim 8 in which:

said resilient means urges said sheet engaging portion of said sheet engaging means away from said gripper means, said second mechanical means being operable to move said sheet engaging portion of said sheet engaging means against said resilient means toward said gripper means. 10. A sheet handling device as set forth in claim 8 in which:

said sheet engaging means includes support means within said cylinder, said support means being secured to said second mechanical means, said second mechanical means being operable to rotate said support means to thereby move said sheet engaging portion of said sheet engaging means against said resilient means toward said gripper means. 11. A sheet handling device as set forth in claim 1 in which:

said sheet engaging means includes a vacuum arm extending to the periphery of said cylinder, said vacuum arm having a sheet engaging end portion movable along the periphery of said cylinder, said sheet engaging end portion being operable to engage said trailing edge of said sheet, said second mechanical means includes cam actuated means to rotate said vacuum arm toward said gripper means. 12. A sheet handling device as set forth in claim 11 in which:

said cylinder includes adjustable stop means for said vacuum arm, said adjustable stop means being operable to limit the movement of said vacuum arm in a direction away from said gripper means. 13. A sheet handling device as set forth in claim 11 in which:

said first mechanical means being operable to urge said vacuum arm end portion away from said gripper means, said cam actuated means being operable to move said end portion toward said gripper means,

said first mechanical means and said cam actuated means being operable to move said vacuum arm end portion toward said gripper means to a sheet engaging position with said trailing edge of said sheet and thereafter move said vacuum arm end portion away from said gripper means after said trailing edge of said sheet has been engaged by said vacuum arm end portion to thereby draw said sheet taut over the periphery of said cylinder.

14. A sheet handling device as set forth in claim 11 in which:

said cam actuated means includes support means for said vacuum arm, said vacuum arm being nonrotatably secured to said support means,

said cam actuated means being operable to rotate said support means and said vacuum arm nonrotatably secured thereto to thereby move said vacuum arm sheet engaging end portion toward said gripper means.

15. A sheet handling device as set forth in claim 14 in which:

said first mechanical means includes resilient means connected to said cam actuated means, said resilient means being operable to rotate said support means and move said vacuum arm sheet engaging end portion away from said gripper means to thereby draw said sheet taut over the periphery of said cylinder.

16. A sheet handling device as set forth in claim 14 in which:

said support means includes a shaft rotatably supported within said transfer cylinder in parallel relation to the axis of rotation of said cylinder.

17. A sheet handling device as set forth in claim 11 in which:

said cam actuated means includes support means for said vacuum arm, said vacuum arm being nonrotatably secured to said support means, said cam actuated means includes a lever nonrotatably secured to said support means, said lever being operable to rotate said support means to thereby move said vacuum arm sheet engaging end portion toward and away from said gripper means, said first mechanical means includes a spring connected to said lever, said spring being operable to rotate said support means and move said vacuum arm sheet engaging end portion away from said gripper means,

said cam actuated means including a roller member rotatably secured to said lever and a cam member positioned adjacent to said cylinder, said cam member having a surface fixed relative to said cylinder,

said roller means being operable to engage said cam surface upon rotation of said cylinder and rotate said lever and said support means to thereby move said vacuum arm sheet engaging end portion toward said gripper means.

18. A sheet handling device comprising a sheet transfer cylinder having gripper means for receiving and gripping the leading edge of a sheet to be transferred and sheet suction engaging means movable along the periphery of said cylinder to engage the trailing edge of the sheet:

said sheet suction engaging means including a sheet engaging portion substantially tangent with said cylinder periphery and a supporting portion rotatably mounted within the body of said cylinder,

suction means being connected with said sheet engaging portion to provide a controlled vacuum for holding the trailing edge of said sheet,

means to rotate said supporting portion whereby said sheet engaging portion is moved along said cylinder periphery toward and away from said gripper means, and

adjustable stop means on said cylinder to limit movement of said sheet engaging portion away from said gripper means.

13 14 19. A sheet handling device as set forth in claim 18 cylinder periphery toward said gripper means and wherein said sheet engaging portion is the head of an arm resilient means to move said sheet engaging portion whose body comprises an integral portion of said supaway from said gripper means. porting portion:

said ar-m being mounted on a shaft within the body of 5 References Cited said cylinder, said shaft being driven so as to make said head move UNITED STATES PATENTS along said cylinder periphery by moving said arm. 39961088 7/1963 YOuPg 271 51 20. A sheet handling device as set forth in claim 18 in 3141667 7/1964 Novlck 271 74 which said means provided to rotate said supporting porlo EDWARD SROKA, Primary Emmi-"en tron lncludes mechanical actuators.

said mechanical actuators comprising a cam operated US. Cl. X.R.

lever to move said sheet engaging portion along said 7l74

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3096088 *Mar 20, 1961Jul 2, 1963Miller Printing Machinery CoSheet holding and transfer mechanism for presses
US3141667 *May 12, 1961Jul 21, 1964Smithe Machine Co Inc F LDevice for feeding envelope blanks
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3829084 *Jul 10, 1972Aug 13, 1974Adamovske Strojirny NpAdjustable transfer gripper cylinder
US3937142 *May 10, 1973Feb 10, 1976Adamovske Strojirny, Narodni PodnikSheet transfer apparatus
US4024814 *Nov 3, 1975May 24, 1977Heidelberger Druckmaschinen AktiengesellschaftTransfer drum in sheet-fed rotary printing presses
US4026209 *Oct 15, 1975May 31, 1977Heidelberger Druckmaschinen AktiengesellschaftSheet-fed rotary printing press for printing on both sides of a sheet
US4101122 *Jan 14, 1976Jul 18, 1978Heidelberger Druckmaschinen AktiengesellschaftSheet turn-over device for a first-form printing and perfecting press with clamping grippers
US4202268 *Jun 25, 1976May 13, 1980Heidelberger Druckmaschinen AktiengesellschaftTransfer drum for printing presses with devices for gripping the leading and trailing edges of a sheet which is being imprinted
US4343241 *May 19, 1980Aug 10, 1982Veb Kombinat Polygraph "Werner Lamberz" LeipzigControl device for suction gripper systems in sheet guiding cylinders
US4409741 *May 1, 1981Oct 18, 1983De La Rue Giori S.A.Conveyor device for transferring freshly printed sheets
US4697512 *Dec 13, 1985Oct 6, 1987M.A.N.-Roland Druckmaschinen AktiengesellschaftSheet gripper system for a printing press
US4852488 *Aug 11, 1982Aug 1, 1989Man Roland DruckmaschinenSheet transfer drum for a printing press
US5186107 *Aug 10, 1992Feb 16, 1993Koenig & Bauer AktiengesellschaftDrum for transporting sheets
US6905120 *Dec 16, 2003Jun 14, 2005Fuji Photo Film Co., Ltd.Drum for fixing sheet-type member
Classifications
U.S. Classification271/277
International ClassificationB41L19/00, B41L13/04, B41F27/10, B41F21/10
Cooperative ClassificationB41L19/00, B41F21/102, B41F27/10, B41L13/04
European ClassificationB41L19/00, B41L13/04, B41F27/10, B41F21/10B
Legal Events
DateCodeEventDescription
Jan 11, 1982ASAssignment
Owner name: MILLER PRINTING EQUIPMENT CORPORATION, 1101 REEDSD
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WESTERN GEAR CORPORATION;REEL/FRAME:003940/0191
Effective date: 19811214