EP0167861A2 - Vorrichtung zum Greifen und Freigeben von Bogen - Google Patents

Vorrichtung zum Greifen und Freigeben von Bogen Download PDF

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Publication number
EP0167861A2
EP0167861A2 EP85107209A EP85107209A EP0167861A2 EP 0167861 A2 EP0167861 A2 EP 0167861A2 EP 85107209 A EP85107209 A EP 85107209A EP 85107209 A EP85107209 A EP 85107209A EP 0167861 A2 EP0167861 A2 EP 0167861A2
Authority
EP
European Patent Office
Prior art keywords
platen
sheet
clamp
release mechanism
displacing members
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.)
Granted
Application number
EP85107209A
Other languages
English (en)
French (fr)
Other versions
EP0167861B1 (de
EP0167861A3 (en
Inventor
Shigeru Kato
Naomi Osada
Masafumi Mochizuki
Masae Murata
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.)
Victor Company of Japan Ltd
Original Assignee
Victor Company of Japan Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Victor Company of Japan Ltd filed Critical Victor Company of Japan Ltd
Publication of EP0167861A2 publication Critical patent/EP0167861A2/de
Publication of EP0167861A3 publication Critical patent/EP0167861A3/en
Application granted granted Critical
Publication of EP0167861B1 publication Critical patent/EP0167861B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J13/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F21/00—Devices for conveying sheets through printing apparatus or machines
    • B41F21/10—Combinations of transfer drums and grippers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F21/00—Devices for conveying sheets through printing apparatus or machines
    • B41F21/10—Combinations of transfer drums and grippers
    • B41F21/104—Gripper details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J21/00—Column, tabular or like printing arrangements; Means for centralising short lines
    • B41J21/04—Mechanisms for setting or restoring tabulation stops
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H5/00—Feeding articles separated from piles; Feeding articles to machines
    • B65H5/08—Feeding articles separated from piles; Feeding articles to machines by grippers, e.g. suction grippers
    • B65H5/12—Revolving grippers, e.g. mounted on arms, frames or cylinders

Definitions

  • the present invention relates to a sheet clamp and release mechanism for use in a printer or the like, and more particularly to a sheet clamp and release mechanism capable of releasing a sheet of print paper from a platen at a high speed and reliably.
  • Various printing machines or printers which print sheets of print paper in a variety of different ways.
  • One of widely used printing processes is to print a sheet of paper disposed around a platen while the platen is being rotated about its own axis in one full revolution.
  • the conventional printer employing such a platen has a sheet clamp and release mechanism composed of a clamp for holding one end of the sheet down against the platen. After the sheet has been printed upon rotation of the platen in one direction, the platen is stopped and then rotated again in the opposite direction to allow the sheet to be discharged, from the end opposite to the clamped end, by feed rollers or the like.
  • the platen has to be stopped temporarily before the printed sheet is discharged, thus wasting a period of time between the time right after the sheet has been supplied and the time right before the printed sheet is discharged. Since the platen must be rotated in the opposite directions, the motor for driving the platen suffers a reduced service life, and an electric circuit is necessary for controlling the rotation of the motor in the opposite directions. As a consequence, the conventional sheet clamp and release mechanism is complex and costly to manufacture.
  • a sheet clamp and release mechanism including a clamp radially movably mounted on a rotatable cylindrical platen for holding the sheet against an outer peripheral surface of the platen when the clamp is moved radially inwardly toward the platen, a shifter means operatively coupled to the platen for shifting the clamp radially outwardly away from the platen to displace an end of the sheet radially outwardly away from the platen when the sheet is to be released from the platen, and a guide means disposed adjacent to the outer peripheral surface of the platen for releasing the end of the sheet from the clamp and platen in response to rotation of the platen.
  • the shifter means For releasing the sheet from the platen, the shifter means is actuated to displace the clamp away from the platen to let the sheet end be displaced radially outwardly from the platen.
  • the guide means engages and removes the sheet end from the clamp to release the sheet from the platen.
  • the clamp is readied for clamping an end of a next sheet. Therefore, sheets can be attached to and released from the platen in succession in a reduced period of time while the platen is kept rotated in one direction only. Since a motor for rotating the platen is not required to be reversed in rotation, the motor does not suffer from stresses, the service life thereof is extended, and no control circuit is necessary for rotating the platen in opposite directions. Therefore, the sheet clamp and release mechanism is relatively simple in construction and can be manufactured inexpensively. Inasmuch as a succession of sheets can be printed when the platen is continuously rotated in one direction without interruption or reversal, the rate of printing the sheets can be increased.
  • a sheet clamp and release mechanism for use in a printer, for example, according to the present invention is essentially composed of a platen 2 of the printer, a clamp 3 mounted on the platen 2, a shifter assembly 4 for shifting the clamp 3 away from the platen 2, and guide members 5 for guiding a printed sheet of paper as it is released from the clamp 3.
  • the platen 2 is of a cylindrical shape around which a sheet of print paper 1 (FIG. 1) can be wound.
  • the platen 2 is supported on a shaft 7 for rotation therearound, the shaft 7 being rotatably supported by means of bearings 9 (only one shown in FIGS. 2 and 3) on a chassis 8 of the printer.
  • the shaft 7 is operatively coupled to a suitable driving unit (not shown) such as a geared motor and can be rotated thereby at a constant speed in the direction of the arrow A (FIG. 1).
  • a pad 10 of rubber is fixedly disposed around the peripheral surface of the platen 2 for preventing the attached sheet 1 from being displaced or slipped off position and also for giving the sheet 1 a resilient backing support for allowing a print head (not shwon) to contact the sheet 1 thoroughly for producing clearer printed characters and/or images.
  • the clamp 3 is mounted on the outer peripheral surface of the platen 2 and extends parallel to the shaft 7, the calmp 3 being movable radially toward and away from the platen 2.
  • the clamp 3 comprises a plurality (three in the illustrated embodiment) of displacing members 11 spaced in the axial direction of the platen 2 and movable toward and away from the platen 2, and a plurality of elongate pressers 12 joined to the displacing members 11 in line with each other in parallel relation to the shaft 7 for pressing an end la of the sheet 1 down against the rubber pad 10.
  • the displacing members 11, when displaced toward the platen 2, are fitted respectively in holders 13 mounted in the platen 2. When the displacing members 11 are moved away from and toward the platen 2, they are slidably guided by the holders 13, respectively. As illustrated in FIGS. 4 and 5, the holders 13 have respective holes 14 defined by tubular members 14a projecting radially-inwardly toward the central axis of the platen 2.
  • Levers 15 are mounted respectively on the displacing members 11 and project radially inwardly into the platen 2 toward the shaft 7 through the respective holes 14 of the holders 13.
  • the levers 15 have flanges 15a, respectively, positioned on radially inward ends thereof.
  • the displacing members 11 are normally urged to move radially inwardly into the platen 2 under the resilient forces of compression coil springs 16 disposed around the tubular members 14a between the flanges 15a and the bottoms of the holders 13.
  • Two of the pressers 12 are disposed between the three displacing members 11, and the other two pressers 12 are positioned at axial ends of the platen 2.
  • the pressers 12 are fixed to radially outward ends of the displacing members 11 and movable therewith radially inwardly and outwardly of the platen 2.
  • the displacing members 11 have substantially central slots 17, respectively, opening radially outwardly for allowing the guide members 5 to move therethrough across and past the clamp 3 without colliding with it when the clamp 3 is in its radially outward position. As shown in FIGS.
  • the displacing members 11 and the pressers 12 jointly have a gripper 18 defined therebetween where they are fixed to each other, the gripper 18 serving to grip the end la of the sheet 1 therein.
  • the gripper 18 is in the form of a mouth defined between the pressers 12 and slanted surfaces lla of the displacing members 11, the mouth being progressively opened in one circumferential direction of the platen 2 for allowing the sheet end la to be easily inserted into the gripper 18.
  • the clamp 3 is moved radially outwardly away from the platen 2 by the shifter assembly 4 when the sheet 1 is to be attached to and released from the platen 2.
  • the shifter assembly 4 is generally composed of a pusher ring 19 mounted on the shaft 7 adjacent to one of the bearings 9 and spaced axially from the platen 2, and a cam mechanism 20 disposed in the platen 2.
  • the pusher ring 19 which is substantially in the form of a hollow cylinder has a central hole 21 through which the shaft 7 extends.
  • the pusher ring 19 is axially movable but nonrotatable with respect to the sahft 7.
  • the pusher ring 19 has a pair of pins 22a, 22b projecting radially outwardly from its outer periphery in diametrically opposite relation to each other.
  • the pins 22a, 22b are operatively coupled to levers 23a, 23b, respectively. Since the levers 23a, 23b are identical to each other in construction and operation, only the lever 23a is shown in FIGS. 6 and 7 and will be described.
  • the lever 23a is pivotally supported at its intermediate portion by a pivot shaft 25 on a bracket 24 mounted on the chassis 8.
  • the lever 23a has a substantially U-shaped recess 26 defined in one end thereof, the pin 22a being slidably fitted in the recess 26.
  • the lever 23a also has an aperture 27 defined in an opposite end thereof and to which an arm 28 (shown by the two-dot-and-dash line) of a solenoid 28a, for example, is connected.
  • the arm 28 is movable in the direction of the arrow B when the solenoid 28a is energized. Therefore, in response to energization of the solenoid 28a, the arm 28 turns the lever 28a clockwise (FIGS. 6 and 7) about the pivot shaft 25 to the position of FIG. 7 for moving the pusher ring 19 by means of the pin 22a axially on the shaft 7 toward the platen 2.
  • the cam mechanism 20 mounted in the platen 2 includes a rod 29 supported axially on the platen 2 for rotation therewith and extending along the shaft 7, and a plurality of shifter cams 30 mounted on the rod 29 at spaced intervals equal to the intervals at which the displacing members 11 are spaced.
  • the rod 29 is supported axially slidably on brackets 31 fixedly disposed in the platen 2 and held in radial alignment with the levers 15 of the displacing members 11.
  • the rod 29 has one end 29a projecting axially out of the platen 2 slidably through a hole 32 defined in an axial end of the platen 2, the end 29a being held against an annular end surface 19a of the pusher ring 19 before the pusher ring 19 is axially moved toward the platen 2.
  • the end 29a of the rod 29 is covered with a wear-resistant cap 29b of a slippery material held slidably against the end surface 19a of the pusher ring 19 so that the rod end 29a can smoothly slide on the end surface 19a while the rod 29 is rotating with the platen 2.
  • the shifter cams 30 mounted on the rod 29 have slanted cam surfaces 30a, respectively, inclined radially inwardly in a direction away from the pusher ring 19.
  • the radially inward ends of the levers 15 are held in sliding contact with the slanted cam surfaces 30a, respectively.
  • a compression coil spring 33 is disposed around the rod 29 between one of the brackets 31 and one of the cams 30 for normally urging the cams 30 and hence the rod 29 to move toward the pusher ring 19.
  • the cams 30 are attached to the rod 29 and contact the levers 15 such that when the pusher ring 19 is in the position shown in FIG. 2 prior to its movement toward the platen 2, the radially inward ends of the levers 15 are positioned on the radially innermost or bottom portions of the slanted cam surfaces 30a close to the rod 29.
  • the sheet clamp and release mechanism 6 of the foregoing construction will operate as follows: For attaching the sheet 1 to the platen 2 or removing the sheet 1 from the platen 2, the solenoid 28 is energized the pusher ring 19 is moved in the direction of the arrow C by the levers 23a, 23b as shown in FIG. 6 to push the end 29a of the rod 29 as illustrated in FIG. 7.
  • the rod 29 is axially moved in the direction of the arrow D in FIG. 2 against the resilient force of the spring 33, causing the slanted cam surfaces 30a to shift the levers 15 radially outwardly for moving the displacing members 11 radially outwardly out of the holders 13.
  • the clamp 3 is moved radially outwardly away from the platen 2 as shown in FIGS. 3 and 5.
  • the cam mechanism 20 is rotated with the platen 2
  • the cap 29b on the rod end 29a slides on the annular end surface 19a of the pusher ring 19.
  • the axial movement of the pusher ring 19 is smoothly transmitted to the rod 29 to shift the clamp 3 radially outwardly without fail.
  • the outer ends llb, at the mouth opening, of the slanted surfaces lla of the displacing members 11 which define the mouth of the gripper 18 are positioned substantially in alignment with the outer peripheral surface of the rubber pad 10, as shown in FIG. 5.
  • the end la of the sheet 1 When attaching the sheet 1 to the platen 2, therefore, the end la of the sheet 1 can smoothly be guided along the rubber pad 10 and the slanted surfaces lla into the gripper 18.
  • the end la of the sheet 1 thus inserted in the gripper 18 is clamped by the clamp 3 when the solenoid 28 is deenergized to move back the cams 30 for allowing the levers 15 to move radially inwardly to the position shown in FIGS. 2 and 4.
  • the end la of the sheet 1 When removing the sheet 1 from the platen 2, the end la of the sheet 1 is positioned more radially outwardly than the outer peripheral surface of the rubber pad 10 since the clamp 3 has been displaced radially outwardly, as shown in FIG. 5.
  • the guide members 5 are supported on an end of a plate 34 fixed to the chassis of the printer and spaced slightly radially outwardly from the platen 2 (see FIGS. 4 and 5).
  • the guide members 5 are spaced along the platen 2 in circumferential registry with the respective slots 17, and are smaller in width than the corresponding slots 17.
  • the guide members 5 can pass through the slots 17, respectively, upon rotation of the platen 2 for releasing the end la of the sheet 1 from the platen 2.
  • the guide members 5 have distal ends 5a located more radially inwardly than the end la of the sheet 1 as it is displaced radially outwardly by the clamp 3 as shown in FIG. 5.
  • FIGS. 8 through 10 show the manner in which the sheet 1 is released from the platen 2 while the platen 2 is in rotation.
  • the clamp 3 When the sheet 1 is printed on the platen 2 while the platne 2 is being rotated, the clamp 3 is displaced radially inwardly to hold the sheet end la against the platen 2 as shown in FIG. 8.
  • the solenoid 28 is energized to enable the shifter assembly 4 to move the clamp 3 radially outwardly away from the platen 2, thus displacing the sheet end la more radially outwardly than the distal ends 5a of the guide members 5 as indicated by the dotted line in FIG. 9.
  • the guide members 5 pass respectively through the slots 17 in the clamp 3 and engage the sheet end la.
  • the guide members 5 remove the sheet end la out of the gripper 18 and hence from the platen 2, whereupon the sheet 1 is guided slidably onto the guide members 5 and the plate 34, from which the sheet 1 will be discharged out of the printer.
  • the sheet 1 can be released from the platen 2 and discharged out of the printer at a high speed and reliably without fail while the platen 2 is continuously rotated in one direction.
  • the clamp 3 is readied for clamping a next sheet of paper on and around the platen 2. Accordingly, a succession of sheets can speedily be attached to and released from the platen 2 for printing operation at a higher rate of speed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Handling Of Cut Paper (AREA)
  • Facsimile Scanning Arrangements (AREA)
EP85107209A 1984-07-12 1985-06-11 Vorrichtung zum Greifen und Freigeben von Bogen Expired EP0167861B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP105492/84U 1984-07-12
JP1984105492U JPS6121169U (ja) 1984-07-12 1984-07-12 排紙機構

Publications (3)

Publication Number Publication Date
EP0167861A2 true EP0167861A2 (de) 1986-01-15
EP0167861A3 EP0167861A3 (en) 1986-07-23
EP0167861B1 EP0167861B1 (de) 1989-05-24

Family

ID=14409093

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85107209A Expired EP0167861B1 (de) 1984-07-12 1985-06-11 Vorrichtung zum Greifen und Freigeben von Bogen

Country Status (4)

Country Link
EP (1) EP0167861B1 (de)
JP (1) JPS6121169U (de)
KR (1) KR890002719Y1 (de)
DE (1) DE3570393D1 (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0483535A1 (de) * 1990-10-30 1992-05-06 Heidelberger Druckmaschinen Aktiengesellschaft Klemmeinrichtung zum Befestigen dünner Aufzüge auf bogenführenden Zylindern einer Bogenrotationsdruckmaschine
EP0488085A1 (de) * 1990-11-22 1992-06-03 Mita Industrial Co., Ltd. Greifereinrichtung von einer Übertragungseinheit
US5503071A (en) * 1993-12-01 1996-04-02 Koenig & Bauer Aktiengesellschaft Cylinder with retractable point spurs and signature clamps
EP0722900A3 (de) * 1994-12-28 1996-07-31 Riso Kagaku Corporation Fixiervorrichtung für den Anfang eines Druckblattes mit Vorrichtung zum Anheben des freigegebenen Blattanfangs
EP0769376A1 (de) * 1995-10-20 1997-04-23 De La Rue Giori S.A. Bogendruckmaschine
US5765459A (en) * 1995-03-25 1998-06-16 Koenig & Bauer-Albert Aktiengesellschaft Method for moving point neeedles in a two stage extension path
US6901858B2 (en) 2003-05-27 2005-06-07 Man Roland Druckmaschinen Ag Plate cylinder of a printing press
US7966933B2 (en) * 2007-05-18 2011-06-28 Man Roland Druckmaschinen Ag Apparatus and method for clamping printing plates on a plate cylinder
CN115321156A (zh) * 2022-07-27 2022-11-11 贵州电网有限责任公司 一种电力电缆限位排列装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103600581B (zh) * 2013-11-04 2016-08-31 天津长荣印刷设备股份有限公司 一种垫牙排装置及其工作方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1019696B (de) * 1956-09-28 1957-11-21 Siemens Ag Vorrichtung zum Aufspannen eines Aufzeichnungstraegers auf eine Trommel, insbesondere fuer Bildtelegrafiegeraete
FR1381312A (fr) * 1963-08-23 1964-12-14 Procédé et duplicateur rotatif permettant l'impression au moyen de planches métalliques et planches d'impression à ce destinées
FR2124983A5 (de) * 1971-02-01 1972-09-22 Adamovske Strojirny Np

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1019696B (de) * 1956-09-28 1957-11-21 Siemens Ag Vorrichtung zum Aufspannen eines Aufzeichnungstraegers auf eine Trommel, insbesondere fuer Bildtelegrafiegeraete
FR1381312A (fr) * 1963-08-23 1964-12-14 Procédé et duplicateur rotatif permettant l'impression au moyen de planches métalliques et planches d'impression à ce destinées
FR2124983A5 (de) * 1971-02-01 1972-09-22 Adamovske Strojirny Np

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IBM TECHNICAL DISCLOSURE BULLETIN, vol. 20, no. 11B, April 1978, pages 4702-4703, New York, US; R.V. DAVIDGE et al.: "Gripper/ejector mechanism" *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0483535A1 (de) * 1990-10-30 1992-05-06 Heidelberger Druckmaschinen Aktiengesellschaft Klemmeinrichtung zum Befestigen dünner Aufzüge auf bogenführenden Zylindern einer Bogenrotationsdruckmaschine
EP0488085A1 (de) * 1990-11-22 1992-06-03 Mita Industrial Co., Ltd. Greifereinrichtung von einer Übertragungseinheit
US5195740A (en) * 1990-11-22 1993-03-23 Mita Industrial Co., Ltd. Nipping device of a transfer unit
US5503071A (en) * 1993-12-01 1996-04-02 Koenig & Bauer Aktiengesellschaft Cylinder with retractable point spurs and signature clamps
EP0722900A3 (de) * 1994-12-28 1996-07-31 Riso Kagaku Corporation Fixiervorrichtung für den Anfang eines Druckblattes mit Vorrichtung zum Anheben des freigegebenen Blattanfangs
US5765459A (en) * 1995-03-25 1998-06-16 Koenig & Bauer-Albert Aktiengesellschaft Method for moving point neeedles in a two stage extension path
US6125728A (en) * 1995-03-25 2000-10-03 Koenig & Bauer-Albert Aktiengesellschaft Apparatus for moving point needles
EP0769376A1 (de) * 1995-10-20 1997-04-23 De La Rue Giori S.A. Bogendruckmaschine
US5839366A (en) * 1995-10-20 1998-11-24 De La Rue Giori S.A. Sheet-fed printing machine
CN1076284C (zh) * 1995-10-20 2001-12-19 吉奥里大街公司 单张纸印刷机
US6901858B2 (en) 2003-05-27 2005-06-07 Man Roland Druckmaschinen Ag Plate cylinder of a printing press
US7966933B2 (en) * 2007-05-18 2011-06-28 Man Roland Druckmaschinen Ag Apparatus and method for clamping printing plates on a plate cylinder
CN115321156A (zh) * 2022-07-27 2022-11-11 贵州电网有限责任公司 一种电力电缆限位排列装置

Also Published As

Publication number Publication date
EP0167861B1 (de) 1989-05-24
KR890002719Y1 (ko) 1989-04-29
EP0167861A3 (en) 1986-07-23
DE3570393D1 (en) 1989-06-29
JPS6121169U (ja) 1986-02-07
KR860001550U (ko) 1986-03-05

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