US2088862A - Printing machine - Google Patents

Description

Aug. 3, 1937. K. T. LANG- PRINTING MACHINE Filed May 2o, '195e 2 Sheets-Sheet l Aug. 3, '1937.

I 2 Sheets-Sheet 2 K. 'r LANG 'PRINTING MACHINE Filed May 20, 1936 Pate-ated Aeg. 3, `1931' UNITED STATES;

PATENT OFFICE In Germany June 1s, 1935 4 Application May 20, 1936, Serial No.'80,774

ll claims. .-(cl. Vlon-40s) This invention relates to a gripper arrangement on the impression cylinder of printing machines.

In the known devices the grippers on the impression cylinder are arranged on a special shaft,

l 5 and. independently thereof, the holding means l ,for the packing of the impression cylinder have also been arranged on the latter. This construction renders access to the packing diilicult, so that an exchange of the packing requires removal of the grippers, which is possible only by disengaging the driving members for `the grippers. The entire process is extremely slow and bothersome.

The invention completely eliminates ,these drawbacks by arranging the grippers for the sheet and the holding means for the packing on a common carrier insuch manner that both members l can be moved about a joint axis and out of operative position.

When work vhas to be done on the packing, the

- grippers and the holding means are simultane-l ously swung out of working position so as to ren- ,der the packing easily accessible. As according 4 to the invention only a single spindle is provided 25, about which both members move, only one bore 4 the pa s in the position during exchange of `the packi and Fig. 4 a view similar to the one shown" in Figal, with the grippers in raised position. f.

40 Referringl tothe drawings, in the end walls 2 of ,the impression cylinder I a spindle 3 extend- .ing .over the'v entire length of the cylinder is mounted, which carries both the gripper-s and. the holding means for the cylinder packing I2.

On the outside of the cylinder wall 2 'aisinglearmed lever 4 carrying at its free end a roll I is firmlyl keyed onto the spindle 3. The roll 3 cooperateswith a cam path, not shown, which is stationarlly arranged on the machine frame, also not shown., Near the end walls 2 of the impression cylinder-I two carriers 6 ride freely movably on the;r` spindle 3 and support with their free ends thejclamping plate 1f for the packing I2. The

holding plate 1 is provided on vthe side facing the packing with teeth and possesses bores through which the screws II pass which can bescrewed into the impression cylinder I. By means of the screws II the plate I is firmly pressed upon the packing and the appurtenant portion of, the impression cylinder I to hold the packing I2 in position.

Over the length of the impression cylinder I bearings 8 are distributed and arranged on the -holding plate l, in which grippers I0 for the sheet lo are movably disposed on carrying pins 9. With their front end the ygrippers engagethe upper part of the holding plate 1, whereas at their rear `iecting beyond the spindle 3 the pins I8 carry j a. link pin 20 on which a connecting rod I4 is rotatably arranged. On this connecting rod Il the levers I3 are looselydisposed -by means oi' correspondingly large bores. Check nuts I5 prevent the levers I3 from slipping off from the rod I4. A compression spring I1 tends to press the driving lever I3,always in the direction of the check nuts I5. 'f ,Y

When the packing I2 is to be removed or exchanged, the clamping plate 1, after loosening of the holding screws II, is swung back about the 30 spindle 3. Simultaneously, the entire gripper arrangement moves also. Since the spindle 3 stands still and the driving lever I3 is cushioned on the rod Il by the spring I1.,the lever I3 can slide back without iniluencing the control means for l35 the grippers III. During this operation the partsv are in the position shownnn Fig. 3 which indi- 'cates that work on the packing is not interfered with by the grippers.

. The grlppers I0 are moved into the position 40 'according to Fig. 4 by means of a cam path arranged outside the impression cylinder and not shown. The cam path, by means of the lever 4, turns the spindle 3 clockwise to a certain extent. whereby the control pin I8 for the grippers -IIJ 45 is moved into the position according to Fig. 4. This motion is transmitted by the connecting rod I4 and the members I5 to the driving lever I3, so that the grippers III are compelled to swing upwardly about the nshaft 9, i. e'., into their re- 50 ceivingy or releasing position. When the cam path provided outside the impression cylinder slopes again, the control members are moved back again into their initial position and the' grippers, by 55 .means of the compression spring I1, are pressed f upon their support or upon the inserted sheet.

I claimzt 1. Impression cylinder for rotary printing machines, comprising a cylinder, a packing for the cylinder, holding means for the packing, means for fastening the holding means to the cylinder, bearings on said holding means, an axle in said bearings, sheet grippers on said axle, control means for the grippers and a spindle disposed in the cylinder and actingv as pivot about which said holding means for the packing are adapted to move without iniluencing said control means.

2. Impression cylinder for rotary printing machines, comprising a cylinder, a packing for the cylinder, holding means for the packing, means for fastening the holding means to the cylinder, bearings on said'f-holding means, an axle in said bearings, sheet grippers on said axle, control means for the grippers, a spindle disposed in the cylinder and acting as pivot about which said holding means for the packing are adapted to move and additional means operated by the said carrying axle and means for controlling the sheet grippers, said means comprising a control lever arranged on the spindle, a driving lever on the carrying axle, a connecting rod ilexibly uniting said two levers and means for turning said spindle corresponding to the working rhythm of the machine.

4. Impression cylinder for rotary printing machines, comprising arecessed cylinder, la packing for the cylinder, holding means forv the packing, a spindle arranged in the recess of the cylinder, carriers for the holding means freely movably disposed on the spindle, means for fastening the holding means and the packing to the cylinder, bearings on the holding means, a carrying axle in said bearings, sheet grippers firmly arranged on said carrying axle and means for controlling the sheet grippers, said means comprising a lever passing through the spindle, a connecting rod articulated to the free end of said lever, a driving lever firmly arranged on the carrying axle of the grippers and loosely embracing said connecting rod With its free end,A holders disposed at the end of said connecting rod for preventing said driving lever from slipping off from said connecting rod, a compression spring on said connecting rod tending to press said driving lever constantly in the direction of said holders, cam paths outside the cylinder and a control lever arranged on the outside of the cylinder on the spindle and cooperating with said carn paths to turn the spindle for opening or closing the grippers.

KARL THEODOR LANG.

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