EP0595761B1 - Vorrichtung zum Spannen von Druckplatten an Offsetdruckmaschinen - Google Patents

Vorrichtung zum Spannen von Druckplatten an Offsetdruckmaschinen Download PDF

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Publication number
EP0595761B1
EP0595761B1 EP19930810356 EP93810356A EP0595761B1 EP 0595761 B1 EP0595761 B1 EP 0595761B1 EP 19930810356 EP19930810356 EP 19930810356 EP 93810356 A EP93810356 A EP 93810356A EP 0595761 B1 EP0595761 B1 EP 0595761B1
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EP
European Patent Office
Prior art keywords
plate
clamping
cylinder
clamp
printing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19930810356
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English (en)
French (fr)
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EP0595761A1 (de
Inventor
Mineyuki Itoh
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sakurai Graphic Systems Corp
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Sakurai Graphic Systems Corp
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Publication date
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Publication of EP0595761A1 publication Critical patent/EP0595761A1/de
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Publication of EP0595761B1 publication Critical patent/EP0595761B1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B41F27/1206—Feeding to or removing from the forme cylinder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B41F27/1218—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices
    • B41F27/1225—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices moving in the printing plate end substantially rectilinearly
    • B41F27/1231—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices moving in the printing plate end substantially rectilinearly by translatory motion substantially tangential to support surface

Definitions

  • the present invention relates to a plate clamping device for use in an offset press according to the preamble of claim 1. More particularly, the present invention pertains to a device which is able to adequately clamp an end of a printing plate mounted on a plate cylinder.
  • DE-B-2.213.614 discloses a device for fixing and adjusting of flexible printing plates on a printing cylinder.
  • the printing plates are fixed on sliding rails of the printing cylinder.
  • the printing cylinder includes locating faces that are arranged in an angle to each other.
  • the sliding rails can be adjusted on the printing cylinder and in relation to the locating faces.
  • EP-A-0431.575 describes a mounting apparatus for a printing press for winding a plate around the circumferential surface of a plate cylinder.
  • the mounting apparatus includes no means for biasing a clamping mechanism for the printing plate along the axial direction of the plate cylinder.
  • Fig. 25 shows a general mechanical composition of an offset press machine.
  • the offset press includes a group of rollers, a plate cylinder 200, a blanket cylinder 210, and an impression cylinder 211.
  • Ink and water are fed from a group of inking rollers 212 and moistening rollers 213, respectively.
  • the ink and the water are mixed.
  • the mixture of the ink and water is applied to a printing plate 204 mounted on the plate cylinder 200.
  • the inked image is transferred to a blanket 214 mounted on the blanket cylinder 210 from the plate 204.
  • the wet image over the blanket 214 is printed onto printing sheets Pa carried on the impression cylinder 211.
  • the state of the printing plate is transferred to the sheets.
  • the correct settings of the printing plate 204 on the plate cylinder 200 is a decisive factor of printing quality.
  • a groove 201 extending perpendicularly to the drawing sheet is formed on the outer peripheral surface of the cylinder 200.
  • a first and a second plate clamps 202, 203 are disposed in the groove 201 to clamp the top and bottom ends of the plate 204, respectively.
  • the clamps 202, 203 are forcively moved in the radial direction in respect to the cylinder 200 for the opening motion.
  • the holding portions of the clamps 202, 203 are moved in the peripheral direction of the plate cylinder 200 for the opening motion.
  • the plate 204 is made of an aluminum thin plate the both ends of which are folded back. The folded ends of the plate 204 are adequately placed in the holding portions to be securely clamped by the clamps 202, 203.
  • the plate 204 is held on the outer periphery of the cylinder 200.
  • the first clamp 202 is fixed to the cylinder 200.
  • a pair of torsion adjusting screws 208, 209 is disposed in the distal end of the second clamps 205, 206, so as to be advanced or retreated.
  • the distal end of each torsion adjusting screw 208, 209 is in contact with the inner wall of the groove 201, respectively.
  • the plate 204 mounted on the cylinder 200 is under the torsion as shown in the chain line in Fig. 23.
  • a screw 207 is provided to adjust the distance between two second clamps 205, 206.
  • a pair of screws 208, 209, for eliminating the torsion of the printing plate 204, is disposed in the distal end of the second clamps 205, 206 so as to be advanced or retreated. The distal end of each screw 208, 209 is in contact with the inner wall of the groove 201.
  • the printing sheet Pa held on the impression roller 211 is under the printing pressure.
  • the water being supplied from the moistening rollers 213 to the plate cylinder 200 moistens the sheets Pa.
  • the pressure applied on the moistened sheets Pa cause to expand an end of each sheet Pa, as shown by chain line, when the multicolor printing is performed.
  • This deformation is referred as "fanout" by the skill in the art.
  • This fanout deformation is eliminated as the sheets Pa dries. Therefore, if further printing is made on these deformed sheets Pa, the printing image would shrink in the dried sheets Pa with the original size.
  • the screws 208, 209 are advanced, the screw 207 is manipulated to widen the distance between the clamps 205, 206 and expand the end of the printing plate 204.
  • the above object is achieved by the easy adjusting operation of the length of second clamp mechanism along the axial direction of the plate cylinder.
  • the plate clamping device according to the invention is characterized by the features of the characterizing part of the independent claim 1.
  • a connecting member is manipulated to change the distance between clamping modules.
  • the length of the second clamping mechanism is expanded or shortened.
  • the end of the second clamping mechanism is pressed to the inner wall of the groove by the force of a biasing member. Therefore, the length of the second clamping mechanism can be easily adjusted in the axial direction with respect to the plate cylinder.
  • FIG. 1 A preferred embodiment of a plate clamping device according to the present invention will now be described referring to Figs. 1 through 21.
  • Fig. 1 shows a three-color offset press 100.
  • the offset press 100 includes a first-color printing unit 101, a second-color printing unit 102 and a third-color printing unit 103.
  • a feeder 104 is disposed in the vicinity of the first-color printing unit 101 at the feeding side.
  • a delivery unit 105 is disposed near the third-color printing unit 103 at the delivery side.
  • ink is fed to a plate cylinder 1 via inking rollers 110.
  • water is supplied to the plate cylinder 1 via moistening rollers 111.
  • On the cylinder 1 is mounted a printing plate 3 (Figs. 7 and 11) on which the ink and the water are mixed with each other.
  • the ink left on the plate 3 in the form of images is transferred to a blanket mounted on a blanket roller 114.
  • Printing sheets Pa are fed from the feeder 104 to the first-color printing unit 101 via a delivery cylinder 112.
  • the printing sheet Pa held on the outer periphery of an impression cylinder 113 comes to contact with the outer periphery of the blanket cylinder 114. While the printing sheet Pa is in contact with the outer periphery of the blanket cylinder 114, the inked images in the first color transferred to the blanket are printed on the sheet Pa. Printing is made all over the printing sheet Pa when the blanket cylinder 114 is rotated by the rotation of the impression cylinder 113. Then, the printing sheet Pa is fed to an impression cylinder 113 of the second-color printing unit 102 via a delivery cylinder 115.
  • the sheet Pa held on the cylinder 113 comes to contact with the outer periphery of a blanket cylinder 114. Then, the inked images of the blanket are transferred to the sheet Pa in the same way as carried out in the first unit 101.
  • the sheet Pa is fed to the third-color printing unit 103.
  • the printed sheet Pa is fed to the delivery unit 105, and the printing procedure is completed.
  • the plate cylinder 1 is rotatably supported between side walls 4a, 4b of the first-color printing unit 101.
  • the cylinder 1 is designed to carry the printing plate 3 (Fig. 11) on its outer peripheral surface.
  • the plate 3 is made of a thin and flat aluminum.
  • a plate holding mechanism F is provided between the side walls 4a, 4b to hold the plate on the plate cylinder 1.
  • a groove 2 extends in the longitudinal direction of the plate cylinder, i.e., in the axial direction of the plate cylinder 1.
  • a first plate clamp A and a second plate clamp B are disposed in the groove 2.
  • the clamps A, B extend in the longitudinal direction of the groove 2 so as to face each other.
  • the first plate clamp A seizes the top end of the plate 3, while the second plate clamp B seizes the bottom end of the plate 3.
  • the plate clamps A, B are spaced in the peripheral direction of the cylinder 1.
  • the clamping portions of the first and second plate clamps A, B are moved in the radial direction of the cylinder 1 for the opening or closing motions.
  • the second plate clamp B has at its each end an adjusting mechanism C for adjusting the torsion of the plate 3 with respect to the cylinder 1.
  • a clamp activating mechanism D is disposed at the right end of the cylinder 1. The mechanism activates the first and second plate clamps A , B to seize the plate 3.
  • a clamp moving mechanism E is disposed at the left end of the plate cylinder 1 to bring the second clamp B towards the first clamp A or away therefrom.
  • the first clamp A is hereinafter described.
  • a longitudinally extending clamping block 10 is disposed in the groove 2.
  • a bearing 19 is fixed to the central portion of the clamping block 10.
  • the clamping block 10 is rotatably attached to the cylinder 1 by a bolt 9. The bolt 9 is inserted through the clamping block 10 and the bearing 19, and screwed into the inner bottom of the groove 2.
  • a pair of movable clamping plates 12 are disposed on the clamping block 10.
  • the movable clamping plates 12 are attached to the respective clamping blocks 10 by means of a plurality of bolts 13 with an allowance for the upward or downward movement of the movable plate 12.
  • the bolts 13 are screwed into the clamping blocks 10.
  • a washer 14 is disposed between each movable clamping plate 12 and bolt 13.
  • Each clamping block 10 has a cam way 10a at the top of its inner end.
  • the cam way 10a extends longitudinally with respect to the block 10 .
  • Each clamping plate 12 has a step 12a at the bottom of its inner end.
  • the step 12a extends longitudinally with respect to the plate 12 so as to face the cam way 10a.
  • a cam shaft S1 set in the cam way 10a opposes the step 12a.
  • the cam shaft S1 extends along the first plate clamp A up to the vicinity of the side wall 2b of the groove.
  • a cam face Sa is formed on the cam shaft S1.
  • a plurality of spring housing holes 16 are provided with each clamping block 10.
  • the holes 16 are disposed on the opposite side of the cam way 10a with respect to the bolt 13 so as to face the clamping plates 12.
  • a compression coil spring 15 disposed in each hole 16 faces the clamping plate 12.
  • the step 12a is continuously pressed against the cam shaft S1 by the force of each spring 15.
  • the outer end of each clamping plate 12 is held open and faces the clamping block 10. Therefore, as shown in Fig. 9, when the cam face Sa is in contact with the chipped portion 12a, the outer end of each clamping plate 12 is kept open by the spring 15.
  • the cam face Sa is not in contact with the chipped portion 12a, the outer end of the clamping plate 12 is kept close by the spring 15.
  • a connecting shaft 18 rotatably supported by the side wall 2b is connected with the outer end of the cam shaft S1 by way of a cylindrical coupling 17.
  • the second clamp B will be described hereinafter.
  • a pair of clamping blocks 20 are spaced in the groove 2.
  • Each clamping block 20 can be moveable between two positions shown by solid line in Figs. 11 and 13, respectively.
  • a moveable clamping plate 21 is disposed on the top of each clamping block 20.
  • the plates 21 are attached to the blocks 20 by means of bolts 22.
  • the plate 21 are allowed to upward or downward movement.
  • the bolt 22 is inserted through the plate 21, and screwed into the block 20.
  • a washer 23 is placed between the plate 21 and the bolt 22.
  • Each clamping block has a cam way 20a extending longitudinally at the top of the inner end of each block 20.
  • a chipped portion 21a is formed at the bottom of the inner end of each plate 21.
  • the chipped portion 21a extends longitudinally with respect to the plate 21 and faces the corresponding cam way 20a.
  • a cam shaft S2 disposed in the cam way 20 faces the step 21a.
  • the cam shaft S1 longitudinally extends along the second clamp B up to the vicinity of the side wall 2b of the groove.
  • a cam face Sb is formed on the cam shaft S2.
  • each block has a plurality of spring housing holes 25 facing the plates 21 at the opposite side of the cam way 20a with respect to the bolt 22.
  • Each hole 25 accommodates a compression coil spring 24.
  • the step 21a is continuously pressed against the cam shaft S2 by the force of each spring 24.
  • the outer end of each clamping plate 21 is biassed in the opening direction with respect to the block 20.
  • Each block 20 has an outer end protruding from the outer end of each clamping plate 21.
  • a chamfer 20c is formed with the end corner of each block 20 in order to guide the plate 3 smoothly.
  • a connecting shaft 27 is rotatably supported by the side wall 2b.
  • the shaft 27 is connected with the outer end of the cam shaft S2 by way of a coupling 26.
  • a pair of engaging grooves 26a, 26b are formed at the both ends of the coupling 26 to lie perpendicularly to each other.
  • An engaging projection 28 formed on the cam shaft S2 and an engaging projection 27a formed on the connecting shaft 27 engage with each other in the grooves 26a, 26b. More specifically, two projections 27a, 28 are engaged one with another so as to be slidable in the radial direction of the coupling 26.
  • the coupling 17 described above has the same structure as the coupling 26.
  • the connecting shaft 18 and the cam shaft S1 are connected to the coupling 17 so as to be able to slide in the radial direction of the coupling 17.
  • a plurality of spring housing holes 20b are provided with each blocks 20.
  • a plurality of coil springs 29 is held between holes 20b and the inner surface of the groove 2.
  • Each block 20 is biassed against the first clamp A by the force of each spring 29.
  • the adjusting mechanism C will be hereinafter described.
  • a connecting block 34 is disposed between clamping blocks 20.
  • the connecting block 34 is slidable along the bottom of the groove 2.
  • An elongate through hole 34a is provided with the connecting block 34.
  • the hole 34a extends in the axial direction of the plate cylinder 1.
  • a rod 30 is inserted in the block 34 by way of the hole 34a, and rotatably supported thereby so as to connect two clamping blocks 20.
  • Male screw portions 30a, 30b are formed at the ends of the rod 30, respectively.
  • the both portions 30a, 30b are threaded in the opposite directions such that the both portions 30a, 30b are driven forward or backward through female screw portions 31 formed at the end of each clamping block 20.
  • a worm wheel 30c is formed at the central portion of the rod 30.
  • an elongate through hole 34b is provided with the block 34.
  • the hole extends perpendicularly and communicats with the hole 34a.
  • a worm 32 engaged with the worm wheel 30c is rotatably held in the hole 34b for the simultaneous turning movement with the rod 30. This turning movement of the rod drives the screws 30a, 30b forward or backward to bring the clamping blocks 20 to or away from each other. In other words, the length of the second plate clamp B can be freely adjusted.
  • an elongate through hole 34c is provided with the rod 34.
  • the hole 34c extends in parallel with the hole 34a.
  • a guide pin 33 is firmly fixed into the hole 34c.
  • the guide pin 33 is slidably held in a hole 46 formed at the end of each clamping block 20.
  • the guide pin 33 is for guiding the moving block 20 when the length of the clamp B is adjusted.
  • a hole 36 is formed on the right side of the block 20.
  • a plunger 37 with a coil spring 35.
  • the plunger 37 is arranged to slide in the axial direction of the cylinder 1.
  • a ball 37a rotatably supported at the outer end of the plunger 37 is in contact with the side wall 2b.
  • the right end of the plunger 37 is biassed to the side wall 2b by the force of the spring 35.
  • a female screw 38 is formed at the left end of the block 20.
  • An adjusting bolt 39 is screwed into the screw 38.
  • a ball 39a rotatably supported at the outer end of the adjusting bolt 39 is in contact with the wall 2c of groove 2.
  • a nut 39b is firmly mounted on the adjusting bolt 39.
  • the second plate clamp B can be moved in the axial direction of the plate cylinder 1 by adjusting the amount of the inserting length of the female screw 38 into the clamping block 20.
  • the clamp activating mechanism D will be hereinafter described.
  • the clamp activating mechanism D includes a first and a second clamp activating mechanic portion D1, D2.
  • the mechanic portion D1 is designed to activate the first plate clamp A, while the second mechanic portion D2 is designed to activate the second plate clamp B.
  • a plate clamping lever 40 is fixed to the shaft 18 which is connected to the cam shaft in Fig. 2.
  • a plate clamping roller 41 is rotatably supported by a shaft 41a at the end portion of the lever 40.
  • a plate releasing lever 43 is pivotally supported by a pivot 43a on the side wall 2b.
  • An abutting portion 43b is integrally formed with the lever 43.
  • the abutting portion 43b extends to contact the pivoting locus of the roller 41.
  • a plate releasing roller 45 is rotatably supported by the shaft 45a.
  • the second clamp activating mechanism D2 is hereinafter described.
  • a lever 50 is fixed on the connecting shaft 27 connected to the cam shaft S2.
  • a plate clamping roller 51 and a plate releasing roller 52 are rotatably supported by shafts 51a and 52a, respectively.
  • the plate clamp moving mechanism E is hereinafter described.
  • a plurality of block-shaped bases 60 are fixed to the inner surface of the groove 2 between the first and second clamps A, B.
  • a guiding groove 60a extends in the peripheral direction of the cylinder 1.
  • a rack 62 fixed to inner surface of each block 20 is slidably disposed inside the guiding groove 60a.
  • a driving shaft S3 is rotatably disposed, by way of bearings, between the both side walls 2b, 2c of the groove 2 such that the shaft S3 extends in the axial direction of the cylinder 1.
  • pinions 61 are formed around the shaft S3 in the conformity to the racks 62 so that each pinion 61 is arranged to engage with each rack 62.
  • a spur gear 63 is fixed to the end of the shaft S3.
  • a first lever 64 is pivotally supported by the shaft 64a on the wall 2c in the vicinity of the spur gear 63.
  • a second lever 65 is pivotally supported by a shaft 65a on the wall 2c at the opposite side to the first lever 64 with respect to the shaft S3.
  • External gears 64b, 65b are formed on the outer periphery of the base of the first and second levers 64, 65. The gears 64b, 65b are engaged with the spur gear 63.
  • the tapered abutting portions 64c, 65c are integrally formed with the first and second levers 64, 65, respectively.
  • the cylinder 1 is turned. Then, the portion 64c is moved to the position where the portion 64c can meet the end of the arm 66.
  • the cylinder 1 is turned, and the portion 65c is moved to the position where the portion 65c meets the arm 66 and can contact the end thereof.
  • the arm 66 reciprocates in the radial direction of the cylinder 1 with aid of an air cylinder (not illustrated).
  • the block 20 returns from the solid line position to the chain line position shown in Fig. 13 according to the force of the spring 29. Then, the second clamp B can spread the plate 3 on the peripheral surface of the cylinder 1 without any slackness. Then, as shown in Fig. 15, the shaft S3 is turned clockwise. Resultingly, the first and second levers 64, 65 return to the solid line position shown in Fig. 14 before the plate 3 is clamped.
  • a plate holding mechanism F is hereinafter explained.
  • a U-type connection fitting 71 is connected to an end of a rod 70a of an air cylinder 70.
  • a proximal end of a link 72 is rotatably connected to the fitting 71 by a pin 73.
  • a distal end of the link 72 is fixed on the shaft 72.
  • the shaft 74 is rotatably supported on the side walls 4a, 4b.
  • a pair of links 75 is fixed on the shaft 74 between the side walls 4a, 4b.
  • a roller shaft 76 is rotatably supported by the distal ends of the connecting links 75.
  • a roller 79 is rotatably supported by the shaft 76 via bearings (not illustrated) such that the roller extends in the axial direction of the cylinder 1.
  • the roller 79 is located in the waiting position.
  • the roller 79 is located in the working position where the roller 79 forces the plate 3 against the cylinder 1.
  • a swinging lever 78 has an end fixed to the right end of the shaft 76.
  • a torsion coil spring 77 is loosely set on the shaft 76 between the link 75 and lever 78. The ends of the spring 77 are hooked on the link 75 and lever 78, respectively.
  • a roller 80 is rotatably supported at the end of a shaft 81 connected to the lever 78.
  • a pair of driven levers 82 is fixed to the shaft 76 between the side walls 4a, 4b. The levers 82 are arranged to swing together with the shaft 76 between the waiting position and the working position, shown in Figs. 18 and 19, respectively.
  • a supporting rod 83 is fixed to the end of the driven levers 82 by means of machine screws 84 such that the rod 83 extends between the levers 82 in the axial direction of the roller 79.
  • a pair of clamping plates 85 is fixed on an end of the rod 83 such that the plates 85 extend in the axial direction of the roller 79.
  • a blade like member 86 made of the hard rubber is narrowly fixed between the plates 85 by means of screw or the equivalent. A first end of the blade 86 protrudes from the clamping plates 85. A second end of the blade 86 is formed slant.
  • a plate holding cam 87 is fixed by means of a pair of machine screws 88 on the right side of the cylinder 1.
  • An elongate hole 87a formed with the cam 87 adjusts the position thereof.
  • the above printing unit is operated as follows.
  • the position of the plate holding cam 87 is adjusted. As shown in Fig. 11, when the plate 12 of the first clamp A is opened, the top end of the plate 3 is guided between the block 10 and the plate 12. Then, when the operation switch (not illustrated) is manipulated, the arm 42 is moved by an air cylinder (not illustrated) in the axial direction (shown by the chain line) of the cylinder 1. After, the roller 41 is beaten by the arm 42 and the lever 40 is pivoted clockwise.
  • the portion 43b pressed by the roller pivots the lever 43 counterclockwise.
  • the arm 42 After beating the roller 41, the arm 42 returns to the original position so as to turns the cylinder 1 in the counterclockwise direction viewed in Fig. 12. Subsequently, as shown in Fig. 10, the cylinder 1 comes to stop at the position where the roller 51 meets the arm 42.
  • the roller 51 is kept at the stopping position to meet the arm 42.
  • the arm 66 is moved by the air cylinder (not illustrated) in the radial direction of the cylinder 1 (shown by the chain line arrow) when the operation switch (not illustrated) is manipulated in this state. Then, the portion 64c is beaten by the driving arm 64, resulting in the pivoting movement of the first and second levers 64, 65. Therefore, the shaft S3 is turned counterclockwise.
  • each pinion 61 of the shaft S3 is turned counterclockwise in order for each rack 62 to move in the direction of the chain arrow against the force of the spring 29 together with the block 20.
  • the bottom end of the plate 3 is precisely placed between the block 20 and the plate 21 while being sliding over the chamfer 20c of the block 20. At this time, the arm 66 remains in contact with the portion 64c.
  • the arm 42 After beating the roller 51, the arm 42 returns to the original position.
  • the cylinder 70 is activated to return the rod 70a to the contracted position.
  • the roller 79 and the blade 86 separate from the cylinder 1 in the sequence reverse to the above.
  • the plate 3 is mounted on the cylinder 1 with the top and bottom ends clamped by the first and second plate clamps A, B, respectively.
  • the arm 66 is moved in the direction of chain line, resulting in the movement of the block 20 in accordance with the force of spring 29.
  • the plate 3 is tightly mounted on the cylinder 1.
  • the rack 62 is moved in the same direction as the block 20.
  • the pinion 61 and the driving shaft S3 are turned clockwise in Fig. 15.
  • the first and second levers 64, 65 are pivoted counterclockwise in Fig. 14, and return from the chain line position towards the solid line position.
  • the cylinder 1 When the plate 3 is to be detached from the cylinder 1, the cylinder 1 is turned in the reverse direction by manipulating the operation switch (not illustrated). Then, the portion 65c is moved to the position where the portion 65c is beaten by the end of the arm 66. The spur gear 63 and the driving shaft S3 are turned by the arm 66 in the same direction as clamping the plate 3. The block 20 is moved in the direction as shown by the chain line arrow in Fig. 15. As a result, the tension of the plate 3 against the cylinder 1 is released. At this time, the end of the arm 60 remains in contact with the portion 65c.
  • the arm 66 is returned to the original position.
  • the clamping block 20 is also returned to the waiting position shown with the solid line in Figs. 11 and 12.
  • the plate cylinder 1 is turned for releasing the roller 45 to move and meet the end of the arm 42.
  • the end of the arm 42 is beaten by the roller 45.
  • the roller 41 is beaten by the portion 43b, and turned in the releasing direction , i.e. counterclockwise viewed in Fig. 9.
  • the connecting shaft 18, S1 are turned in the releasing direction.
  • the cam face Sa comes to contact the step 12a.
  • the clamping plate 12 is opened by the force of the spring 15.
  • the top end of the plate 3 is released from the first clamp A.
  • the arm 42 thus, returns to the original position after beating the roller 45.
  • the nut 39b is turned to advance the bolt 39 in the protruding direction of the chain line arrow in Fig. 3.
  • the spring 35 is compressed, as shown in Fig. 5, for moving the blocks 20 of the second clamp B in the direction of the chain line arrow against the force of the spring 35.

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  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)

Claims (6)

  1. Vorrichtung zum Einspannen von Platten an einer Offset-Druckmaschine (100) mit einem Plattenzylinder (1) für die Aufnahme einer Druckplatten (3), wobei diese Druckplatten (3) ein erstes Ende und ein zweites Ende aufweisen, und mit einer ersten Spannvorrichtung (A) zum Einspannen des ersten Endes der Druckplatte (3) und einer zweiten Spannvorrichtung (B; B1; B2) zum Einspannen des zweiten Endes der Druckplatte (3), wobei die zweite Spannvorrichtung mehrere Einspannmodule (B; B1; B2) aufweist, die in der axialen Richtung des Plattenzylinders (1) nebeneinander liegen, und mit einer Nute (2), die sich auf der äusseren Oberfläche des Plattenzylinders (3 ), in dessen axialer Richtung erstreckt und welche die erste (A) und die zweite (B; B1; B2) Spannvorrichtung und eine Verbindungseinrichtung (C) aufnimmt, um die Spannmodule ( B; B1) miteinander zu verbinden und den Abstand der nebeneinander liegenden Module (B; B1) in der vorgegebenen Art zu verändern, nachdem ein Druckbogen (Pa) aufgefächert wurde, wobei die Vorrichtung gekennzeichnet ist durch
       ein Spannelement (38, 39) zum Ausrichten eines Endes der zweiten Spanneinrichtung (B; B1; B2) in axialer Richtung des Plattenzylinders (1), gegenüber der inneren Wand (2c) der Nute (2) um die zweite Spanneinrichtung (B; B1; B2) in der Nute (2) abzustützen.
  2. Vorrichtung nach Anspruch 1, bei welcher jede der Spanneinrichtungen (A; B; B1; B2) einen Block (10; 20) und ein Glied zum Öffnen (12; 21) aufweist, welches zusammen mit dem Block (10; 20) des Endes der Druckplatte (3) festklemmt.
  3. Vorrichtung nach Anspruch 2, bei welcher das Glied zum Öffnen (12, 21) mit einer Nockenwelle (S1; S2) geschlossen wird, welche zwischen einer Nute (10a; 20a) die auf dem Block (10; 20) und einem Absatz (12a; 21a) verläuft, der mit dem Glied zum Öffnen (12; 21) gebildet wird, und der mit der Spannkraft einer Federeinrichtung (15; 25) geöffnet wird, die zwischen dem Block (10; 20) und dem Glied (12; 21) zum Öffnen angeordnet ist.
  4. Vorrichtung nach den Ansprüchen 1 bis 3, bei welchem die zweite Spannvorrichtung (B; B1; B2) in axialer Richtung des Plattenzylinders (1) bewegbar ist.
  5. Vorrichtung nach Anspruch 4, bei welcher das Spannglied eine Schraube (38) aufweist, welche an einem Ende der zweiten Spannvorrichtung (B; B1, B2) angebracht ist, sowie eine Schraubenfeder, welche am anderen Ende der zweiten Spannvorrichtung (B; B1; B2) angebracht ist, und welche die Schraube (38) gegen die innere Oberfläche (2c) der Nute (2) presst.
  6. Vorrichtung nach Anspruch 3, bei welcher jede Nockenwelle (S1; S2) mit einem Mechanismus (D) zum Betätigen einer Klemme verbunden ist, welcher den entsprechenden Einspannmechanismus (12; 21) betätigt.
EP19930810356 1992-10-29 1993-05-14 Vorrichtung zum Spannen von Druckplatten an Offsetdruckmaschinen Expired - Lifetime EP0595761B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP291828/92 1992-10-29
JP4291828A JP2837324B2 (ja) 1992-10-29 1992-10-29 印刷機のファンアウト調整装置

Publications (2)

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EP0595761A1 EP0595761A1 (de) 1994-05-04
EP0595761B1 true EP0595761B1 (de) 1997-08-20

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JP (1) JP2837324B2 (de)
DE (1) DE69313243T2 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10009667B4 (de) * 1999-03-19 2004-06-03 Heidelberger Druckmaschinen Ag Spanneinrichtung zum Aufspannen von Druckformen
JP2007112037A (ja) * 2005-10-21 2007-05-10 Komori Corp 印刷機の版万力装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3156184A (en) * 1962-02-20 1964-11-10 Harris Intertype Corp Plate clamp
DE69022822T2 (de) * 1989-12-06 1996-05-23 Komori Printing Mach Platteneinbringungseinrichtung für Druckpressen.

Also Published As

Publication number Publication date
EP0595761A1 (de) 1994-05-04
JPH06134963A (ja) 1994-05-17
DE69313243T2 (de) 1998-03-12
JP2837324B2 (ja) 1998-12-16
DE69313243D1 (de) 1997-09-25

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