EP0233377B1 - Folding apparatus for web rotary press - Google Patents
Folding apparatus for web rotary press Download PDFInfo
- Publication number
- EP0233377B1 EP0233377B1 EP86200263A EP86200263A EP0233377B1 EP 0233377 B1 EP0233377 B1 EP 0233377B1 EP 86200263 A EP86200263 A EP 86200263A EP 86200263 A EP86200263 A EP 86200263A EP 0233377 B1 EP0233377 B1 EP 0233377B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder
- gripper
- folding
- signature
- speed reduction
- 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
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H45/00—Folding thin material
- B65H45/12—Folding articles or webs with application of pressure to define or form crease lines
- B65H45/16—Rotary folders
- B65H45/162—Rotary folders with folding jaw cylinders
- B65H45/168—Rotary folders with folding jaw cylinders having changeable mode of operation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F13/00—Common details of rotary presses or machines
- B41F13/54—Auxiliary folding, cutting, collecting or depositing of sheets or webs
- B41F13/56—Folding or cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F13/00—Common details of rotary presses or machines
- B41F13/54—Auxiliary folding, cutting, collecting or depositing of sheets or webs
- B41F13/56—Folding or cutting
- B41F13/60—Folding or cutting crosswise
Definitions
- the present invention relates to a folding apparatus for cutting a web printed by a web rotary press into sheets of predetermined size and folding the cut sheets.
- a conventional web rotary press has a folding apparatus for cutting a printed, dried and cooled web into sheets of predetermined size and folding the cut sheets into halves along their path of travel or perpendicularly thereto.
- the folding methods in the conventional folding apparatuses are: former folding for causing a former to fold a web into halves along its path of travel before the web is cut; single or double signature parallel folding for causing a folding cylinder to fold signatures into halves or quarters perpendicularly to their path of travel; and chopper cross folding for causing a chopper to fold parallel-folded signatures into halves along their path of travel.
- each signature conveyed by chains abuts against a paper stop.
- a plate-like chopper blade moves downward toward the center of the stopped signature and then into a gap between lower rollers, thereby folding the signature into halves.
- the conventional chopper folding apparatus cannot perform high-speed folding at a speed exceeding a given maximum speed.
- an overall speed of the printing press including a printing apparatus and a delivery apparatus must be decreased corresponding to the maximum speed of the chopper folding apparatus. This has prevented development of high-speed printing presses.
- US-A 4159 823 vis à vis which claim 1 is delimited discloses a multiple product folder in a high speed rotary web printing machine for the production of signatures with various folds having a plurality of various operating cylinders, such as a pair of web cutting cylinders, a signature collecting cylinder, signature transfer and folding cylinders for one transversal and for a second parallel fold and signature delivering cylinders, wherein certain cylinders are driven by gear trains for accomplishing more than one slow-down speed, which gear trains have shiftable couplings for changing the speed of the transfer cylinders from a full speed to a slow-down speed according to the requirements of forwarding and delivering of certain signatures, whereas a shifting from a slow-down to a full speed can be performed for a certain folding action and the slow-down delivery yet can be maintained.
- various operating cylinders such as a pair of web cutting cylinders, a signature collecting cylinder, signature transfer and folding cylinders for one transversal and for a second parallel fold and signature
- GB-A 564 049 discloses a cutting, folding and delivery mechanism for rotary printing presses.
- the mechanism comprises co-operating cutting cylinders, a collecting cylinder, two jaw cylinders and delivery cylinders.
- the collecting cylinder has a diameter which is one and one-haiftimes the diameter of the cutting cylinders.
- two pairs of signature conveying means and delivery means are arranged.
- Printed and parallel-folded signatures are alternately fed to the two pairs of assemblies, and are folded with choppers at a relatively low speed.
- the cross-folded signatures are then discharged.
- a pair of speed reduction cylinders are brought into rolling contact with a gripper cylinder having a diameter twice that of speed reduction cylinder.
- the feed speed of each signature delivered from the gripper cylinder is reduced by each speed reduction cylinder and the signature is fed to upper or lower chopper folding path.
- Fig. 1 is a side view of a folding unit in a folding apparatus for a web rotary press according to an embodiment of the present invention.
- Leading rollers 1, nipping rollers 2 and 3 are vertically arranged below a former which is arranged in a web feed unit (not shown) and which folds the web into halves along its path of travel.
- a web 4 folded by the former into halves along its path of travel is guided to a folding unit 5.
- cutting and pin cylinders 6 and 7 each with a diameter twice that of the plate cylinder are located below the nipping rollers 3. The web 4 is guided between the cylinders 6 and 7.
- a pair of cutting blades 8 are mounted at predetermined positions on the outer surface of the cutting cylinder 6 rotated in a direction indicated by arrow A.
- the predetermined positions are symmetrical with each other about the axis of the cutting cylinder 6.
- the cutting blades 8 extend along the entire length of the cutting cylinder 6.
- Cutting blade pads 9 made of an elastic material such as rubber are arranged at surface positions of the pin cylinder 7 rotated in a direction indicated by arrow B.
- the cutting blade pads 9 are symmetrical with each other about the axis of the pin cylinder 7.
- a plurality of pins 10 are pivotally arranged behind the cutting blade pads 9 with respect to the rotational direction of the pin cylinder 7 and constitute two arrays.
- Reference numeral 11 denotes a plurality of paper hold tapes in slidable contact with a web winding surface of the pin cylinder 7.
- a folding cylinder 12 is in rolling contact with the pin cylinder 7.
- the folding cylinder 12 has a diameter 1.5 times that of the pin cylinder 7 and is rotated in a direction indicated by arrow C.
- Three arrays of pins 13 and three insertion blades 14 are arranged at six equal angular positions on the surface of the folding cylinder 12. Each blade 14 extends along the entire length of the cylinder 7.
- the pins 13 are located opposite to the pins 10 upon rotation of the cylinders 7 and 12.
- the signature released from the pins 10 is pierced by the pins 13 and is wound around the upper surface portion of the folding cylinder 12.
- Reference numeral 15 denotes a plurality of paper hold tapes in slidable contact with the folding cylinder 12.
- a gripper cylinder 16 in rolling contact with the folding cylinder 12 is arranged obliquely therebelow.
- the gripper cylinder 16 has a diameter substantially 1/1.5 times that of the folding cylinder 12 and is rotated in a direction indicated by arrow D.
- a pair of gripper plates 17 are arranged on the surface at equal angular intervals. Each gripper plate 17 is arranged opposite to a corresponding one of the insertion blades 14 upon rotation of the cylinders 12 and 16.
- Reference numeral 18 denotes a plurality of paper hold tapes in slidable contact with the signature winding surface of the gripper cylinder 16.
- a speed reduction cylinder 19 is in sliding contact with the gripper cylinder 16 and is located obliquely above the cylinder 16. The speed reduction cylinder 19 is rotated in a direction indicated by arrow E and has an outer diameter such that a peripheral velocity thereof is lower than that of the gripper cylinder 16.
- a ratio of a number of revolutions of the gripper cylinder 16 to that of the speed reduction cylinder 19 is about 3 : 1, but a ratio of an outer diameter of the gripper cylinder 16 to that of the speed reduction cylinder 19 is about 1 : 2.
- Six gripper units 20 each constituted by grippers and gripper pads are arranged on the speed reduction cylinder 19 at six equal angular positions, respectively.
- the gripper unit 20 can be located opposite to a corresponding one of the gripper plates 17 upon rotation of the cylinders 16 and 19.
- Each gripper unit 20 receives the signature from the gripper plate 17 so as to wind the signature on the upper surface portion of the cylinder 19.
- Reference numerals 21 and 22 denote upper and lower paper hold tapes in slidable contact with the upper and lower surfaces of the speed reduction cylinder 19.
- An upper transfer cylinder 23 is arranged obliquely above the speed reduction cylinder 19 and is in rolling contact therewith.
- the upper transfer cylinder 23 has a diameter 1/1.5 times that of the speed reduction cylinder 19 and is rotated in a direction indicated by arrow F.
- Two gripper units 24 having the same arrangement as that of the gripper units 20 are arranged on the surface of the upper transfer cylinder 23 at equal angular intervals. Each gripper unit 24 will be opposite to a corresponding one of the gripper units 20 upon rotation of the cylinders 19 and 23.
- a lower transfer cylinder 25 is arranged obliquely below the speed reduction cylinder 19 and is in rolling contact therewith.
- the lower transfer cylinder 25 has a diameter 1/1.5 times that of the speed reduction cylinder 19 and is rotated in a direction indicated by arrow G.
- Two gripper units 26 having the same arrangement as that of the gripper units 20 are arranged on the surface of the lower transfer cylinder 25 at equal angular intervals. Each gripper unit 26 will be opposite to a corresponding one of the gripper units 20 upon rotation of the cylinders 19 and 25.
- Reference numeral 27 denotes a plurality of paper hold tapes in sliding contact with the surface of the upper transfer cylinder 23.
- Reference numeral 28 denotes a plurality of upper paper hold tapes in sliding contact with the lower surface of the upper transfer cylinder 23 and offset from the tapes 27 in the axial direction of the cylinder 23.
- Reference numeral 29 denotes a plurality of paper hold tapes in sliding contact with the surface of the lower transfer cylinder 25.
- Reference numeral 30 denotes a plurality of lower paper hold tapes in sliding contact with the lower surface of the lower transfer cylinder 25 and offset from the tapes 29 in the axial direction of the cylinder 25.
- Each remaining gripper unit 30 is selectively located opposite to one gripper unit 26 of the lower transfer cylinder 25 to transfer the signature to the lower transfer cylinder 25.
- the signature gripped by the upper gripper unit 24 is fed onto the upper tapes 28.
- the signature gripped by the lower gripper unit 26 is fed onto the lower tapes 30.
- Chopper units (not shown) are arranged on the upper and lower tapes 28 and 30, respectively.
- the operation of the folding unit having the arrangement described above will be described with reference to Fig. 1 and Figs. 2A to 2D.
- the printed web 4 folded by a former (not shown) into halves along its path of travel is guided by the leading rollers 1 and the like to the gap between the cutting cylinder 6 and the pin cylinder 7.
- the first array of pins 10 holds the leading end of the web 4 to wind the web 4 around the lower half of the surface of the pin cylinder 7 upon 1/2 revolution of the pin cylinder 7.
- the prospective trailing end of the web 4 is cut by the cutting blade 8.
- the leading end of the next web 4 is held by the second array of pins 10.
- the cylinders 6 and 7 in Fig. 2A show this state. More particularly, Fig.
- FIG. 2A shows a signature 4K wound around the pin cylinder 7 and nine signatures 4A to 4J preceding the signature 4K by 1/2 revolution each.
- the signature 4K is moved to the position of the signature 4J, and the signature 4J, to the signature 4H, and so on.
- the gripper cylinder 16 and the upper and lower transfer cylinders 23 and 25 are also rotated by 1/2 revolution, the folding cylinder, 1/3 revolution; and the speed reduction cylinder 19, 1/6 revolution.
- Peripheral velocities of the pin cylinder 7, the folding cylinder 12 and the gripper cylinder 16 are identical.
- the peripheral velocities of the speed reduction cylinder 19 and the upper and lower transfer cylinders 23 and 25 are identical and smaller by about 35% than that of the pin cylinder 7.
- the signatures 4J and 4H preceding the signature 4K by 1/3 revolution each of the folding cylinder 12 are wound around the folding cylinder 12 while they are being held by the pins 13.
- the further preceding signature 4G is transferred from the pins 13 to the gripper plate 17 and is about to be wound around the gripper cylinder 16.
- the signature 4F is gripped by the gripper plate 17 and is wound around the gripper cylinder 16.
- the further preceding signatures 4D and 4E are gripped by the gripper units 20 of the speed reduction cylinder 19 and are wound therearound.
- the signature 4C is gripped by the gripper unit 20 and is located opposite to a non-gripper portion of the upper transfer cylinder 23.
- the gripped end of the signature 40 passes through the contact point of the cylinders 19 and 23 and the signature 4C is then wound around the speed reduction cylinder 19.
- the signature 4B preceding by 1/6 revolution of the speed reduction cylinder 19 from the signature 4C is transferred from the gripper unit 20 in the speed reduction cylinder 19 to the gripper unit 24 of the upper transfer cylinder 33 and wound therearound.
- the signature 4B is then released from the gripper unit 24 and is fed by the upper tapes 28.
- Fig. 2B shows a state wherein the respective cylinders are rotated through angles corresponding to 1/4 revolution of the pin cylinder 7 from the state in Fig. 2A.
- a new signature 4L is wound around the pin cylinder 7 while it is being held by the pins 10.
- the signature 4K is held by the pins 13, and the center of the signature 4K reaches the contact point between the cylinders 7 and 12.
- the center of the signature 4H is gripped by the gripper plate 17, and the signature 4H is about to be folded into halves.
- the signature 4G has already been folded into halves and is wound around the gripper cylinder 16.
- the signatures 4D and 4E are wound around the speed reduction cylinder 19.
- the signature 4D is about to be gripped by the gripper unit 24 in the upper transfer cylinder 23.
- the signature 4C is wound around the gear reduction cylinder 19 after it has passed the contact point between the upper transfer cylinder 23 and the speed reduction cylinder 19.
- the signature 4A is transferred to the gripper unit 26 in the lower transfer cylinder 25 and is wound around the lower transfer cylinder 25.
- the signature 4B conveyed by the upper tapes 28 in Fig. 2A is subjected to cross folding in a chopper unit (not shown).
- Fig. 20 shows a state wherein the respective cylinders are rotated through angles corresponding to 3/4 revolution of the pin cylinder 7 from the state of Fig. 2B.
- the signatures 4E to 4M are moved by one revolution of the pin cylinder 7 from the state of Fig. 2A, i.e., by two pitches of the gripper unit 20 of the speed reduction cylinder 19.
- the signature 4F is now located at the position of the signature 4D in Fig. 1A.
- the signature 4D is gripped by the gripper unit 24 in the upper transfer cylinder 23 and is wound therearound.
- the signature 4D is then released from the gripper unit 24 and is conveyed onto the upper tapes 28.
- the signature 4C is gripped by the gripper unit 26 in the lower transfer cylinder 25.
- the signature 4A is conveyed by the gripper unit 26 and is about to be released therefrom.
- Fig. 2D shows a state wherein the respective cylinders are rotated through angles corresponding to 1/4 revolution of the pin cylinder 7 from the state of Fig. 2C.
- the signatures 4F to 4N are moved by one revolution of the pin cylinder 7 from the state of Fig. 2B, i.e., by two pitches of the gripper unit 20.
- the signature 3F is now located at the position of the signature 4D in Fig. 1B.
- the signature 4E is wound around the speed reduction cylinder 19.
- the signature 4C is wound around the lower transfer cylinder 25 while it is being held by the gripper unit 26 thereof.
- the signature 4A is released from the gripper unit 26 and is conveyed onto the lower tapes 30 toward a chopper unit (not shown).
- the web 4 is held by the pins 10 in the pin cylinder 7, and the prospective trailing end is cut.
- the obtained signature is gripped by the pins 13 of the folding cylinder 12 and is wound therearound.
- the center of the wound signature is gripped by the gripper plate 17 in the gripper cylinder 16 and is folded into halves upon rotation of the gripper cylinder 16.
- the folded signature is gripped by the gripper unit 20 in the speed reduction cylinder 19 and is gradually wound therearound.
- the wound signature is conveyed by the speed reduction cylinder 19 rotated at a peripheral velocity slower than the gripper cylinder 16.
- the conveyed signatures are then alternately gripped by the gripper units 24 and 26 of the upper and lower transfer cylinders 23 and 25, respectively.
- the upper transfer cylinder 23 conveys the signature at the same peripheral velocity as that of the speed reduction cylinder 19 and delivers the signature onto the upper tapes 28. The signature is thus conveyed in the corresponding chopper unit.
- the lower transfer cylinder 25 conveys the signature at the same peripheral velocity as that of the speed reduction cylinder 19 and delivers the signature onto the lower tapes 30. The signature is thus conveyed in the corresponding chopper unit.
- Double signature parallel folding in the folding apparatus will be described with reference to Figs. 3A to 31.
- the upper transfer cylinder 23 is not used, so that the gripper units 24 are kept inoperative. Every other gripper unit 20 of the speed reduction cylinder 19 is kept inoperative. One of the gripper plates 17 in the gripper cylinder 16 is also kept inoperative.
- the web 4 is fed between the cutting cylinder 6 and the pin cylinder 7.
- the web 4 is cut by the cutting blade 8 and is held by the pins 10.
- the web 4 is wound around the pin cylinder
- the leading end of the web 4 is held by the pins 10 and the respective cylinders are rotated through angles corresponding to two revolutions of the pin cylinder 7. Since one of the gripper plates 17 is held inoperative, the three signatures 4A, 4B and 4C sequentially gripped by the pins 13 are wound around the folding cylinder 12. One signature 4D is wound around the pin cylinder 7. In this state, when the respective cylinders are rotated through angles corresponding to 1/4 revolution of the pin cylinder 7, the pins 13 holding the signature 4A pierce and hold the signature 4D. The signature 4D overlays the signature 4A and is wound around the folding cylinder 12. In this case, the center of the signature 4B is located opposite to the gripper plate 17.
- the folded signature 4B is transferred to the gripper unit 20 of the speed reduction cylinder 19 and is wound around the gear reduction cylinder 19, as shown in Fig. 3F.
- the center of the overlaying signatures 4A and 4D is located opposite to the gripper plate 17, so that the signature 4F overlays the signature 4C.
- the center of the overlaying signatures 4A and 4D is gripped by the gripper plate 17, so that the signatures 4A and 4D are folded together into halves and the folded overlaying signatures 4A and 4D are wound around the gripper cylinder 16.
- the single signature 4E and the overlaying signatures 4C and 4F are wound around the folding cylinder 12.
- a new signature 4G is wound around the pin cylinder 7.
- the signature 4B is moved by 1/2 pitch of the gripper unit 20, as shown in Fig. 3H.
- the overlaying signatures 4A and 4D are angularly moved through 45 ° and are wound around the gripper cylinder 16.
- the single signature 4E and the overlaying signatures 4C and 4F are angularly moved through 30 ° .
- the signature 4G is held by the pins 13 and is wound around the folding cylinder 12.
- a new signature 4H is held by the pins 10 and is then wound around the pin cylinder.
- the respective cylinders are rotated through angles corresponding to three revolutions of the pin cylinder 7, and the operations in Figs. 3E to 3H are repeated.
- the states of the cutting cylinder 6 to the gripper cylinder 16 are the same as those in Fig. 3H.
- the speed reduction cylinder 19 is rotated by one revolution, so that the overlaying signatures 4C and 4F and the overlaying signatures 4E and 4H are held on the surface of the speed reduction cylinder 19 to be separated by a distance corresponding to the pitch of the gripper unit 20.
- the overlaying folded signatures 4A and 4D are gripped by a gripper unit 26 of the lower transfer cylinder 35.
- the leading, folded signature 4B is released from the gripper unit 26 and is delivered onto the lower tapes 30. Thereafter, the respective cylinders are continuously rotated to deliver each overlaying folded signatures onto the lower tapes 30 for every revolution of the pin cylinder 7. Only the first signature 4B is delivered as a single signature, and the second and subsequent signatures are delivered as double signatures each.
- the peripheral velocity of the speed reduction cylinder 19 and the transfer cylinders 23 and 25 is lower than that of the cutting cylinder 6 to the gripper cylinder 16, so that the feed speed of the signature fed to the chopper unit can be decreased. Even if the speed of the signatures fed from the cutting cylinder 6 to the gripper cylinder 16 is increased in accordance with the printing speed, the signatures can be fed at a speed lower than the printing speed. As a result, high chopper folding precision can be maintained, and the number of folded signatures obtained is the total number of signatures from the upper and lower chopper units, thereby guaranteeing productivity corresponding to the printing speed.
- the folding apparatus for the web rotary press has a folding cylinder with pins and insertion blades and in rolling contact; with a pin cylinder; a gripper cylinder adapted to be in rolling contact with the folding cylinder and having a diameter 1/1.5 times that of the folding cylinder and gripper plates opposite to the insertion blades; a speed reduction cylinder adapted to be in rolling contact with the gripper cylinder, rotated at a peripheral velocity lower than that of the gripper cylinder and having gripper units; and a pair of upper and lower transfer cylinders each with two gripper units opposite to the surface of the speed reduction cylinder.
- the signatures parallel-folded by the folding and gripper cylinders are transferred to the speed reduction cylinder.
- the signatures are alternately transferred from the speed reduction cylinder to the upper and lower transfer cylinders.
- the parallel folding speed and the chopper capacity which correspond to a high printing speed can be maintained, and at the same time, the speed of signatures fed into the chopper units can be decreased, thereby improving productivity corresponding to high-speed printing and folding precision of the chopper units.
- the conveyance speed of the signatures is decreased, they are firmly gripped by the corresponding gripper units. The trailing edge of each signature is released when the signature is delivered from the transfer cylinder. Therefore, signature misalignment can be minimized and folding precision is improved.
- pattern assignment is considered, different patterns can be assigned to the upper and lower cylinders, thereby greatly facilitating the subsequent operation.
- Single signature parallel folding can be easily witched to double signature parallel folding, and operability can be improved.
- Signature cutting and signature overlaying are performed at different positions, thereby obtaining high cutting precision.
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- Mechanical Engineering (AREA)
- Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
Abstract
Description
- The present invention relates to a folding apparatus for cutting a web printed by a web rotary press into sheets of predetermined size and folding the cut sheets.
- A conventional web rotary press has a folding apparatus for cutting a printed, dried and cooled web into sheets of predetermined size and folding the cut sheets into halves along their path of travel or perpendicularly thereto. The folding methods in the conventional folding apparatuses are: former folding for causing a former to fold a web into halves along its path of travel before the web is cut; single or double signature parallel folding for causing a folding cylinder to fold signatures into halves or quarters perpendicularly to their path of travel; and chopper cross folding for causing a chopper to fold parallel-folded signatures into halves along their path of travel. These folding methods can be used singly or in combination in accordance with the signature specifications.
- In a chopper folding apparatus among the conventional folding apparatuses for performing the above-mentioned folding methods, each signature conveyed by chains abuts against a paper stop. A plate-like chopper blade moves downward toward the center of the stopped signature and then into a gap between lower rollers, thereby folding the signature into halves. However, the conventional chopper folding apparatus cannot perform high-speed folding at a speed exceeding a given maximum speed. When a conventional chopper folding apparatus is used, an overall speed of the printing press including a printing apparatus and a delivery apparatus must be decreased corresponding to the maximum speed of the chopper folding apparatus. This has prevented development of high-speed printing presses.
- US-A 4159 823 vis à vis which claim 1 is delimited discloses a multiple product folder in a high speed rotary web printing machine for the production of signatures with various folds having a plurality of various operating cylinders, such as a pair of web cutting cylinders, a signature collecting cylinder, signature transfer and folding cylinders for one transversal and for a second parallel fold and signature delivering cylinders, wherein certain cylinders are driven by gear trains for accomplishing more than one slow-down speed, which gear trains have shiftable couplings for changing the speed of the transfer cylinders from a full speed to a slow-down speed according to the requirements of forwarding and delivering of certain signatures, whereas a shifting from a slow-down to a full speed can be performed for a certain folding action and the slow-down delivery yet can be maintained.
- GB-A 564 049 discloses a cutting, folding and delivery mechanism for rotary printing presses. The mechanism comprises co-operating cutting cylinders, a collecting cylinder, two jaw cylinders and delivery cylinders. The collecting cylinder has a diameter which is one and one-haiftimes the diameter of the cutting cylinders.
- As described in Japanese Utility Model Publication No. 5 513 341, two pairs of signature conveying means and delivery means are arranged. Printed and parallel-folded signatures are alternately fed to the two pairs of assemblies, and are folded with choppers at a relatively low speed. The cross-folded signatures are then discharged. According to this conventional apparatus, a pair of speed reduction cylinders are brought into rolling contact with a gripper cylinder having a diameter twice that of speed reduction cylinder. The feed speed of each signature delivered from the gripper cylinder is reduced by each speed reduction cylinder and the signature is fed to upper or lower chopper folding path. Even after the grippers of the speed reduction cylinder are opened to release a leading end of the signature, the trailing end of the signature is held by the gripper and speed reduction cylinders which are rotated at different speeds The signature is then unstably conveyed and is often misaligned. Folding precision in the chopper unit in the subsequent process is thus degraded. In the worst case, the chopper unit is jammed with signatures, and printing operation must be interrupted.
- It is, therefore, a principal object of the present invention to provide a folding apparatus for a web rotary press wherein chopper folding can be performed with high precision without decreasing a parallel folding speed, thus providing high folding efficiency.
- It is another object of the present invention to provide a folding apparatus for a web rotary press wherein signatures are not misaligned and folding precision is improved.
- In order to achieve the above objects of the present invention, there is provided a folding apparatus for a web rotary press, according to claim 1. Brief Description of the Drawings
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- Fig. 1 is a side view showing a folding unit in a folding apparatus for a web rotary press according to an embodiment of the present invention;
- Figs. 2A to 2D are schematic side views for explaining single signature parallel folding in the folding unit shown in Fig. 1; and
- Figs. 3A to 31 are schematic side views for explaining double signature parallel folding in the folding unit shown in Fig. 1.
- The present invention will be described with reference to a preferred embodiment in conjunction with the accompanying drawings.
- Fig. 1 is a side view of a folding unit in a folding apparatus for a web rotary press according to an embodiment of the present invention. Leading rollers 1, nipping rollers 2 and 3 are vertically arranged below a former which is arranged in a web feed unit (not shown) and which folds the web into halves along its path of travel. In this embodiment, a web 4 folded by the former into halves along its path of travel is guided to a folding unit 5. In the folding unit 5, cutting and
pin cylinders cylinders cutting cylinder 6 rotated in a direction indicated by arrow A. The predetermined positions are symmetrical with each other about the axis of thecutting cylinder 6. The cutting blades 8 extend along the entire length of thecutting cylinder 6.Cutting blade pads 9 made of an elastic material such as rubber are arranged at surface positions of thepin cylinder 7 rotated in a direction indicated by arrow B. Thecutting blade pads 9 are symmetrical with each other about the axis of thepin cylinder 7. A plurality ofpins 10 are pivotally arranged behind thecutting blade pads 9 with respect to the rotational direction of thepin cylinder 7 and constitute two arrays. Thepins 10 pierce the leading end of the next web 4 after the trailing end of the current web 4 is cut between the cutting blade 8 and thecutting blade pad 9. Reference numeral 11 denotes a plurality of paper hold tapes in slidable contact with a web winding surface of thepin cylinder 7. A foldingcylinder 12 is in rolling contact with thepin cylinder 7. The foldingcylinder 12 has a diameter 1.5 times that of thepin cylinder 7 and is rotated in a direction indicated by arrow C. Three arrays ofpins 13 and threeinsertion blades 14 are arranged at six equal angular positions on the surface of the foldingcylinder 12. Eachblade 14 extends along the entire length of thecylinder 7. Thepins 13 are located opposite to thepins 10 upon rotation of thecylinders pins 10 is pierced by thepins 13 and is wound around the upper surface portion of the foldingcylinder 12.Reference numeral 15 denotes a plurality of paper hold tapes in slidable contact with the foldingcylinder 12. Agripper cylinder 16 in rolling contact with the foldingcylinder 12 is arranged obliquely therebelow. Thegripper cylinder 16 has a diameter substantially 1/1.5 times that of the foldingcylinder 12 and is rotated in a direction indicated by arrow D. A pair ofgripper plates 17 are arranged on the surface at equal angular intervals. Eachgripper plate 17 is arranged opposite to a corresponding one of theinsertion blades 14 upon rotation of thecylinders insertion blade 14 is opposite to thecorresponding gripper plate 17, it folds the center of the signature and inserts it into thecorresponding gripper plate 17, so that the signature is wound around the lower surface portion of thegripper cylinder 16.Reference numeral 18 denotes a plurality of paper hold tapes in slidable contact with the signature winding surface of thegripper cylinder 16. Aspeed reduction cylinder 19 is in sliding contact with thegripper cylinder 16 and is located obliquely above thecylinder 16. Thespeed reduction cylinder 19 is rotated in a direction indicated by arrow E and has an outer diameter such that a peripheral velocity thereof is lower than that of thegripper cylinder 16. A ratio of a number of revolutions of thegripper cylinder 16 to that of thespeed reduction cylinder 19 is about 3 : 1, but a ratio of an outer diameter of thegripper cylinder 16 to that of thespeed reduction cylinder 19 is about 1 : 2. Sixgripper units 20 each constituted by grippers and gripper pads are arranged on thespeed reduction cylinder 19 at six equal angular positions, respectively. Thegripper unit 20 can be located opposite to a corresponding one of thegripper plates 17 upon rotation of thecylinders gripper unit 20 receives the signature from thegripper plate 17 so as to wind the signature on the upper surface portion of thecylinder 19. Reference numerals 21 and 22 denote upper and lower paper hold tapes in slidable contact with the upper and lower surfaces of thespeed reduction cylinder 19. Anupper transfer cylinder 23 is arranged obliquely above thespeed reduction cylinder 19 and is in rolling contact therewith. Theupper transfer cylinder 23 has a diameter 1/1.5 times that of thespeed reduction cylinder 19 and is rotated in a direction indicated by arrow F.Two gripper units 24 having the same arrangement as that of thegripper units 20 are arranged on the surface of theupper transfer cylinder 23 at equal angular intervals. Eachgripper unit 24 will be opposite to a corresponding one of thegripper units 20 upon rotation of thecylinders lower transfer cylinder 25 is arranged obliquely below thespeed reduction cylinder 19 and is in rolling contact therewith. Thelower transfer cylinder 25 has a diameter 1/1.5 times that of thespeed reduction cylinder 19 and is rotated in a direction indicated by arrow G.Two gripper units 26 having the same arrangement as that of thegripper units 20 are arranged on the surface of thelower transfer cylinder 25 at equal angular intervals. Eachgripper unit 26 will be opposite to a corresponding one of thegripper units 20 upon rotation of thecylinders Reference numeral 27 denotes a plurality of paper hold tapes in sliding contact with the surface of theupper transfer cylinder 23.Reference numeral 28 denotes a plurality of upper paper hold tapes in sliding contact with the lower surface of theupper transfer cylinder 23 and offset from thetapes 27 in the axial direction of thecylinder 23.Reference numeral 29 denotes a plurality of paper hold tapes in sliding contact with the surface of thelower transfer cylinder 25.Reference numeral 30 denotes a plurality of lower paper hold tapes in sliding contact with the lower surface of thelower transfer cylinder 25 and offset from thetapes 29 in the axial direction of thecylinder 25. With the above arrangement, everyother gripper unit 20 is selectively located opposite to onegripper unit 24 of theupper transfer cylinder 23 to transfer the signature to theupper transfer cylinder 23. Each remaininggripper unit 30 is selectively located opposite to onegripper unit 26 of thelower transfer cylinder 25 to transfer the signature to thelower transfer cylinder 25. The signature gripped by theupper gripper unit 24 is fed onto theupper tapes 28. The signature gripped by thelower gripper unit 26 is fed onto thelower tapes 30. Chopper units (not shown) are arranged on the upper andlower tapes - The operation of the folding unit having the arrangement described above will be described with reference to Fig. 1 and Figs. 2A to 2D. The printed web 4 folded by a former (not shown) into halves along its path of travel is guided by the leading rollers 1 and the like to the gap between the cutting
cylinder 6 and thepin cylinder 7. The first array ofpins 10 holds the leading end of the web 4 to wind the web 4 around the lower half of the surface of thepin cylinder 7 upon 1/2 revolution of thepin cylinder 7. In this case, the prospective trailing end of the web 4 is cut by the cutting blade 8. The leading end of the next web 4 is held by the second array ofpins 10. Thecylinders signature 4K wound around thepin cylinder 7 and ninesignatures 4A to 4J preceding thesignature 4K by 1/2 revolution each. In other words, upon each 1/2 revolution of thepin cylinder 7, thesignature 4K is moved to the position of thesignature 4J, and thesignature 4J, to thesignature 4H, and so on. In this case, when thepin cylinder 7 is rotated by 1/2 revolution, thegripper cylinder 16 and the upper andlower transfer cylinders speed reduction cylinder 19, 1/6 revolution. Peripheral velocities of thepin cylinder 7, thefolding cylinder 12 and thegripper cylinder 16 are identical. The peripheral velocities of thespeed reduction cylinder 19 and the upper andlower transfer cylinders pin cylinder 7. With this arrangement, thesignatures signature 4K by 1/3 revolution each of thefolding cylinder 12 are wound around thefolding cylinder 12 while they are being held by thepins 13. The further precedingsignature 4G is transferred from thepins 13 to thegripper plate 17 and is about to be wound around thegripper cylinder 16. Thesignature 4F is gripped by thegripper plate 17 and is wound around thegripper cylinder 16. The further precedingsignatures 4D and 4E are gripped by thegripper units 20 of thespeed reduction cylinder 19 and are wound therearound. Thesignature 4C is gripped by thegripper unit 20 and is located opposite to a non-gripper portion of theupper transfer cylinder 23. The gripped end of thesignature 40 passes through the contact point of thecylinders signature 4C is then wound around thespeed reduction cylinder 19. Thesignature 4B preceding by 1/6 revolution of thespeed reduction cylinder 19 from thesignature 4C is transferred from thegripper unit 20 in thespeed reduction cylinder 19 to thegripper unit 24 of the upper transfer cylinder 33 and wound therearound. Thesignature 4B is then released from thegripper unit 24 and is fed by theupper tapes 28. Thesignature 4A preceding by 1/6 revolution of thespeed reduction cylinder 19 from thesignature 4B opposes a non-gripper portion of theupper transfer cylinder 23, and then the gripped end thereof reaches the contact point between thelower transfer cylinder 25 and thespeed reduction cylinder 19 while thesignature 4A is being wound around thespeed reduction cylinder 19. - Fig. 2B shows a state wherein the respective cylinders are rotated through angles corresponding to 1/4 revolution of the
pin cylinder 7 from the state in Fig. 2A. Anew signature 4L is wound around thepin cylinder 7 while it is being held by thepins 10. Thesignature 4K is held by thepins 13, and the center of thesignature 4K reaches the contact point between thecylinders signature 4H is gripped by thegripper plate 17, and thesignature 4H is about to be folded into halves. Thesignature 4G has already been folded into halves and is wound around thegripper cylinder 16. Thesignatures 4D and 4E are wound around thespeed reduction cylinder 19. The signature 4D is about to be gripped by thegripper unit 24 in theupper transfer cylinder 23. Thesignature 4C is wound around thegear reduction cylinder 19 after it has passed the contact point between theupper transfer cylinder 23 and thespeed reduction cylinder 19. Thesignature 4A is transferred to thegripper unit 26 in thelower transfer cylinder 25 and is wound around thelower transfer cylinder 25. It should be noted that thesignature 4B conveyed by theupper tapes 28 in Fig. 2A is subjected to cross folding in a chopper unit (not shown). - Fig. 20 shows a state wherein the respective cylinders are rotated through angles corresponding to 3/4 revolution of the
pin cylinder 7 from the state of Fig. 2B. In this state, thesignatures 4E to 4M are moved by one revolution of thepin cylinder 7 from the state of Fig. 2A, i.e., by two pitches of thegripper unit 20 of thespeed reduction cylinder 19. Thesignature 4F is now located at the position of the signature 4D in Fig. 1A. The signature 4D is gripped by thegripper unit 24 in theupper transfer cylinder 23 and is wound therearound. The signature 4D is then released from thegripper unit 24 and is conveyed onto theupper tapes 28. Thesignature 4C is gripped by thegripper unit 26 in thelower transfer cylinder 25. Thesignature 4A is conveyed by thegripper unit 26 and is about to be released therefrom. - Fig. 2D shows a state wherein the respective cylinders are rotated through angles corresponding to 1/4 revolution of the
pin cylinder 7 from the state of Fig. 2C. In this state, thesignatures 4F to 4N are moved by one revolution of thepin cylinder 7 from the state of Fig. 2B, i.e., by two pitches of thegripper unit 20. The signature 3F is now located at the position of the signature 4D in Fig. 1B. Thesignature 4E is wound around thespeed reduction cylinder 19. Thesignature 4C is wound around thelower transfer cylinder 25 while it is being held by thegripper unit 26 thereof. Thesignature 4A is released from thegripper unit 26 and is conveyed onto thelower tapes 30 toward a chopper unit (not shown). - By the operation sequence as described above, the web 4 is held by the
pins 10 in thepin cylinder 7, and the prospective trailing end is cut. The obtained signature is gripped by thepins 13 of thefolding cylinder 12 and is wound therearound. The center of the wound signature is gripped by thegripper plate 17 in thegripper cylinder 16 and is folded into halves upon rotation of thegripper cylinder 16. The folded signature is gripped by thegripper unit 20 in thespeed reduction cylinder 19 and is gradually wound therearound. The wound signature is conveyed by thespeed reduction cylinder 19 rotated at a peripheral velocity slower than thegripper cylinder 16. The conveyed signatures are then alternately gripped by thegripper units lower transfer cylinders upper transfer cylinder 23 conveys the signature at the same peripheral velocity as that of thespeed reduction cylinder 19 and delivers the signature onto theupper tapes 28. The signature is thus conveyed in the corresponding chopper unit. Similarly, thelower transfer cylinder 25 conveys the signature at the same peripheral velocity as that of thespeed reduction cylinder 19 and delivers the signature onto thelower tapes 30. The signature is thus conveyed in the corresponding chopper unit. - Speed reduction of the signature and feed path selection of the signatures into the upper and lower delivery paths are separated. When the signatures are delivered onto the
tapes - Double signature parallel folding in the folding apparatus will be described with reference to Figs. 3A to 31. In this case, the
upper transfer cylinder 23 is not used, so that thegripper units 24 are kept inoperative. Everyother gripper unit 20 of thespeed reduction cylinder 19 is kept inoperative. One of thegripper plates 17 in thegripper cylinder 16 is also kept inoperative. After these preparatory procedures are completed, the web 4 is fed between the cuttingcylinder 6 and thepin cylinder 7. In the same manner as in parallel folding in Figs. 2A to 2D, the web 4 is cut by the cutting blade 8 and is held by thepins 10. The web 4 is wound around the pin cylinder - 7. The leading end of the web 4 is held by the
pins 10 and the respective cylinders are rotated through angles corresponding to two revolutions of thepin cylinder 7. Since one of thegripper plates 17 is held inoperative, the threesignatures pins 13 are wound around thefolding cylinder 12. One signature 4D is wound around thepin cylinder 7. In this state, when the respective cylinders are rotated through angles corresponding to 1/4 revolution of thepin cylinder 7, thepins 13 holding thesignature 4A pierce and hold the signature 4D. The signature 4D overlays thesignature 4A and is wound around thefolding cylinder 12. In this case, the center of thesignature 4B is located opposite to thegripper plate 17. - When the respective cylinders are rotated through angles corresponding to 1/4 revolution of the
pin cylinder 7 from this State, the center of thesignature 4B is gripped by thegripper plate 17, as shown in Fig. 3C, so that thesignature 4B is folded into halves. When the respective cylinders are further rotated through angles corresponding to 1/4 revolution of thegripper plate 17, thesignature 4B is wound around thegripper cylinder 16, as shown in Fig. 3D. At the same time, thesignature 4C passes over theinoperative gripper plate 17, and thesignature 4E is held by thepins 13. When the respective cylinders are further rotated through angles corresponding to 1/4 revolution of thepin cylinder 7, the gripped end of the foldedsignature 4B is located opposite to thespeed reduction cylinder 19, and the gripped end of the overlayingsignatures 4A and 4D is located opposite to thegripper cylinder 16, as shown in Fig. 3E. - When the respective cylinders are rotated through angles corresponding to 1/4 revolution of the
pin cylinder 7, the foldedsignature 4B is transferred to thegripper unit 20 of thespeed reduction cylinder 19 and is wound around thegear reduction cylinder 19, as shown in Fig. 3F. At the same time, the center of the overlayingsignatures 4A and 4D is located opposite to thegripper plate 17, so that thesignature 4F overlays thesignature 4C. When the respective cylinders are rotated through angles corresponding to 1/4 revolution of thepin cylinder 7 from this state, thesignature 4B is moved by 1/2 pitch of thegripper unit 20, as shown in Fig. 3G. At the same time, the center of the overlayingsignatures 4A and 4D is gripped by thegripper plate 17, so that thesignatures 4A and 4D are folded together into halves and the foldedoverlaying signatures 4A and 4D are wound around thegripper cylinder 16. Thesingle signature 4E and the overlayingsignatures folding cylinder 12. Anew signature 4G is wound around thepin cylinder 7. In this state, when the respective cylinders are rotated through angles corresponding to 1/4 revolution of thepin cylinder 7 from this state, thesignature 4B is moved by 1/2 pitch of thegripper unit 20, as shown in Fig. 3H. At the same time, the overlayingsignatures 4A and 4D are angularly moved through 45° and are wound around thegripper cylinder 16. Thesingle signature 4E and the overlayingsignatures signature 4G is held by thepins 13 and is wound around thefolding cylinder 12. Anew signature 4H is held by thepins 10 and is then wound around the pin cylinder. - Thereafter, the respective cylinders are rotated through angles corresponding to three revolutions of the
pin cylinder 7, and the operations in Figs. 3E to 3H are repeated. As shown in Fig. 31, the states of thecutting cylinder 6 to thegripper cylinder 16 are the same as those in Fig. 3H. Thespeed reduction cylinder 19 is rotated by one revolution, so that the overlayingsignatures signatures speed reduction cylinder 19 to be separated by a distance corresponding to the pitch of thegripper unit 20. The overlaying foldedsignatures 4A and 4D are gripped by agripper unit 26 of the lower transfer cylinder 35. The leading, foldedsignature 4B is released from thegripper unit 26 and is delivered onto thelower tapes 30. Thereafter, the respective cylinders are continuously rotated to deliver each overlaying folded signatures onto thelower tapes 30 for every revolution of thepin cylinder 7. Only thefirst signature 4B is delivered as a single signature, and the second and subsequent signatures are delivered as double signatures each. - As described above, in single signature parallel folding shown in Figs. 2A to 2D, when the web 4 folded by the former is supplied to the folding unit, the web 4 is cut for every 1/2 revolution of the
pin cylinder 7. The signature is subjected to parallel folding between thefolding cylinder 12 and thegripper cylinder 16. The feed speed of the signature is decreased when it is transferred from thegripper cylinder 16 to thespeed reduction cylinder 19. The signatures are alternately delivered on the upper andlower tapes lower transfer cylinders - In double signature parallel folding in Figs. 3A to 31, when the web 4 folded by the former is supplied to the folding unit, it is cut for every 1/2 revolution of the
pin cylinder 7. The signatures are overlayed and parallel-folded for every revolution of thepin cylinder 7. The speed of the signatures is reduced while it is transferred from thegripper cylinder 16 to thespeed reduction cylinder 19. The overlaying signatures are delivered onto thelower tapes 30 through thelower transfer cylinder 25. As a result, former folding and double signature parallel folding provides a 16-page signature. The signature is conveyed into the chopper unit and is subjected to chopper folding into halves, thereby obtaining a 32- page signature. When single signature parallel folding is switched to double signature parallel folding, the cylinder arrangement need not be modified, but simply some gripper units and gripper plates are held inoperative. - The peripheral velocity of the
speed reduction cylinder 19 and thetransfer cylinders cutting cylinder 6 to thegripper cylinder 16, so that the feed speed of the signature fed to the chopper unit can be decreased. Even if the speed of the signatures fed from thecutting cylinder 6 to thegripper cylinder 16 is increased in accordance with the printing speed, the signatures can be fed at a speed lower than the printing speed. As a result, high chopper folding precision can be maintained, and the number of folded signatures obtained is the total number of signatures from the upper and lower chopper units, thereby guaranteeing productivity corresponding to the printing speed. - The folding apparatus for the web rotary press has a folding cylinder with pins and insertion blades and in rolling contact; with a pin cylinder; a gripper cylinder adapted to be in rolling contact with the folding cylinder and having a diameter 1/1.5 times that of the folding cylinder and gripper plates opposite to the insertion blades; a speed reduction cylinder adapted to be in rolling contact with the gripper cylinder, rotated at a peripheral velocity lower than that of the gripper cylinder and having gripper units; and a pair of upper and lower transfer cylinders each with two gripper units opposite to the surface of the speed reduction cylinder. The signatures parallel-folded by the folding and gripper cylinders are transferred to the speed reduction cylinder. The signatures are alternately transferred from the speed reduction cylinder to the upper and lower transfer cylinders. When the chopper units are arranged in the delivery path of the signatures fed from the upper and lower transfer cylinders, the parallel folding speed and the chopper capacity which correspond to a high printing speed can be maintained, and at the same time, the speed of signatures fed into the chopper units can be decreased, thereby improving productivity corresponding to high-speed printing and folding precision of the chopper units. In addition, when the conveyance speed of the signatures is decreased, they are firmly gripped by the corresponding gripper units. The trailing edge of each signature is released when the signature is delivered from the transfer cylinder. Therefore, signature misalignment can be minimized and folding precision is improved. Furthermore, when pattern assignment is considered, different patterns can be assigned to the upper and lower cylinders, thereby greatly facilitating the subsequent operation.
- Single signature parallel folding can be easily witched to double signature parallel folding, and operability can be improved. Signature cutting and signature overlaying are performed at different positions, thereby obtaining high cutting precision.
Claims (3)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE8686200263T DE3664429D1 (en) | 1986-02-20 | 1986-02-20 | Folding apparatus for web rotary press |
EP86200263A EP0233377B1 (en) | 1986-02-20 | 1986-02-20 | Folding apparatus for web rotary press |
AT86200263T ATE44690T1 (en) | 1986-02-20 | 1986-02-20 | FOLDING DEVICE FOR ROTARY PRESS. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP86200263A EP0233377B1 (en) | 1986-02-20 | 1986-02-20 | Folding apparatus for web rotary press |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0233377A1 EP0233377A1 (en) | 1987-08-26 |
EP0233377B1 true EP0233377B1 (en) | 1989-07-19 |
Family
ID=8195702
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86200263A Expired EP0233377B1 (en) | 1986-02-20 | 1986-02-20 | Folding apparatus for web rotary press |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0233377B1 (en) |
AT (1) | ATE44690T1 (en) |
DE (1) | DE3664429D1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2643589B1 (en) * | 1989-02-28 | 1991-06-14 | Marinoni Harris Sa | CUTTING AND FOLDING MACHINE FOR A STRIP OF PRINTED PAPER |
DE9320408U1 (en) * | 1993-04-28 | 1994-06-23 | Albert-Frankenthal Ag, 67227 Frankenthal | Folder for rotary printing machines |
US10723582B2 (en) | 2014-07-23 | 2020-07-28 | Kimberly-Clark Worldwide, Inc. | Method and apparatus for folding a product |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB200583A (en) * | 1922-04-12 | 1923-07-12 | Hoe & Co R | Improvements in sheet delivery |
US2138499A (en) * | 1937-09-14 | 1938-11-29 | Cottrell C B & Sons Co | Sheet collecting and folding mechanism for printing presses |
GB564049A (en) * | 1942-06-03 | 1944-09-11 | Goss Printing Press Co Ltd | Improvements in or relating to cutting, folding and delivery mechanism |
US2511149A (en) * | 1945-07-12 | 1950-06-13 | Goss Printing Press Co Ltd | Rotary printing and folding mechanism |
US4159823A (en) * | 1977-08-12 | 1979-07-03 | Wood Industries, Inc. | Multiple product folder |
-
1986
- 1986-02-20 EP EP86200263A patent/EP0233377B1/en not_active Expired
- 1986-02-20 DE DE8686200263T patent/DE3664429D1/en not_active Expired
- 1986-02-20 AT AT86200263T patent/ATE44690T1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
ATE44690T1 (en) | 1989-08-15 |
DE3664429D1 (en) | 1989-08-24 |
EP0233377A1 (en) | 1987-08-26 |
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