US3498217A - Safety device for machines having oppositely rotating cylinders - Google Patents

Safety device for machines having oppositely rotating cylinders Download PDF

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Publication number
US3498217A
US3498217A US700832A US3498217DA US3498217A US 3498217 A US3498217 A US 3498217A US 700832 A US700832 A US 700832A US 3498217D A US3498217D A US 3498217DA US 3498217 A US3498217 A US 3498217A
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United States
Prior art keywords
switch
shaft
safety device
rotating cylinders
oppositely rotating
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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
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US700832A
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English (en)
Inventor
Paul F Kletti
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.)
Heidelberger Druckmaschinen AG
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Heidelberger Druckmaschinen AG
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Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0018—Protection means against injury to the operator
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2193—Guard mechanisms

Definitions

  • a safety device for a machine such as a printing machine, which has oppositely rotating cylinders which define a contact gap between themselves.
  • a swingable switch-actuating assembly is provided to actuate a control current limit switch to stop the operation of the machine when this assembly is turned.
  • the switchactuating assembly includes a pair of elongated protective members which are respectively located adjacent the pair of oppositely rotating cylinders while at the elevation of the contact gap therebetween there is a rotary shaft which extends parallel to the oppositely rotating cylinders. This latter shaft fixedly carries a pair of hell cranks whose arms respectively extend to ends of the pair of elongated protective members to carry the latter.
  • a mounting means mounts the ends of these protective members on the bell crank arms for free rotary movement with respect thereto as well as for movement toward and away from the rotary shaft, and a spring means coacts with the elongated protective members to urge the latter away from the rotary shaft.
  • My invention relates to safety devices.
  • my invention relates to safety devices which are adapted to be used in connection with oppo sitely rotating cylinders, particularly those of a printing press.
  • a pair of such oppositely rotating cylinders define between themselves a contact gap where the cylinders may, for example, directly engage each other or where they engage a sheet material which passes between and in engagement with such cylinders.
  • These cylinders have parallel axes, respectively, and the safety device will generally include a swingable switch-actuating assembly turnable about an axis parallel to that of each cylinder and coacting with a control current limit switch in order to terminate the operation of the machine.
  • Safety devices of this general type are known in connection with the oppositely rotating cylinders of printing presses, for example, where a suitable detent structure releasably maintains a swingable protective rod in a given operating position.
  • This protective rod has the form of an easily movable switch-actuating body which coacts with an interrupter switch in such a way that when the body is swung a movement of a switch plunger and thus a termination of the flow of current takes place.
  • This switch-actuating body has a non-circular configuration and is provided with edges which in the safety position of the assembly are situated closely adjacent to the oppositely rotating cylinders to be displaced away from the latter when the safety assembly is swung to terminate the flow of current and stop the machine.
  • the switch-actuating body since the switch-actuating body is releasably maintained in its operating position by a detent structure, it will not exert any pressure on an object which approaches the danger zone of the contact gap between the oppositely rotating cylinders as soon as the safety assem- 3,498,217 Patented Mar. 1 970 bly has been displaced beyond the position in which it is held by the detent structure.
  • the danger zone becomes completely exposed without any substantial resistance so that, for example, an operators hand which rapidly approaches the contact gap between the oppositely rotating cylinder can be compressed therebetween before the machine has come to a full stop upon actuation of the switch. See German Patent 766,210.
  • this construction has the disadvantage that when an object approaches the danger zone, such as, for example, the hand of an operator, this object may be clamped between the contact rail and the exterior surface of the cylinder when as a result of a reflex action the operator attempts to withdraw his hand from the danger zone. Even if the machine is brought to a stop in good time, there can still be injury to an operator because the contact rail acts practically as a block preventing withdrawal of a hand of the operator which approaches the danger zone. See British Patent 938,993.
  • pair of elongated protective members which may have a tubular construction and which are preferably situated at a distance of approximately a hand-width from the contact gap of the oppositely rotating cylinders.
  • a rotary shaft which is in front of the danger zone, and a pair of bell cranks are fixed to this rotary shaft and have their arms extending up to the elongated protective members to carry the latter.
  • These elongated protective members are supported at their ends for free rotary movement at the arms of the bell cranks and they are capable of being displaced toward the rotary shaft in opposition to the force of a spring means.
  • this latter assembly forms a swingable switch-actuating structure which when actuated, as by engagement of a hand of the operator with one of the protective members, will bring about actuation of a control current limit switch to stop the operation of the machine.
  • FIG. 1 is a partly sectional side elevation of a safety device of my invention shown with an offset printing press which is fragmentarily illustrated in a schematic manner;
  • FIG. 2 is a fragmentary sectional transverse elevation of the structure of FIG. 1 shown as it is carried by the side walls of the machine frame.
  • the offset printing press which is fragmentarily illustrated in the drawings includes a rotary plate cylinder 1 and the rubber-blanketed cylinder 2 which receives an impression from the plate cylinder 1 in a well known manner.
  • These oppositely rotating cylinders 1 and 2 of the printing press define between themselves the contact gap 3 where these cylinders engage each other although in other cases the oppositely rotating cylinders may pass any suitable sheet material between themselves by frictional engagement therewith at the contact gap 3.
  • the danger zone Just to the left of the contact gap 3 is situated the danger zone where the safety device of my invention is located.
  • This safety device includes the rotary shaft 4 which forms a swing shaft supported for rotation about its axis at both of the side walls 5 of the machine.
  • a pair of bell cranks 6 and 7 are respectively fixed to the rotary shaft 4 for swinging movement therewith.
  • each of the bell cranks has a pair of lever arms of equal length forming an angle of 90 between themselves.
  • a suitable cross pin extends through the hub of each bell crank and the part of the shaft 4 surrounded thereby for fixing each bell crank to the shaft 4.
  • the axis of the shaft 4 is situated at the elevation of the contact gap 3 and extends parallel to the parallel axes of the cylinders 1 and 2.
  • a horizontal plane which contains the axis of the shaft 4 will also contain the contact gap 3 and will in fact define a plane of symmetry with respect to the shaft 4 and the bell cranks, as is apparent from FIG. 1.
  • the arms of the bell cranks. 6 and 7 are respectively formed with longitudinally extending slots 8, and each slot 8 receives an end 9 of an elongated tubular protective member 10, the members 10 respectively terminating at their ends in the elements 9 which form bearing pins ex tending from the tubular parts of the protective members 10 through the slots 8.
  • an upper elongated protective member 10 terminating in a pair of opposed bearing pins 9 which respectively extend through the slots 8 of the upper arms of the pair of hell cranks, and in a corresponding way there is a.
  • lower protective member 10 terminating in a pair of bearing pins 9 which are received in the slots 8 of the lower arms of the bell cranks, respectively.
  • the pair of elongated protective members 10 can be arranged closely adjacent to the exterior surfaces of the cylinders 1 and 2 at a distance of approximately a hand-width from the contact gap 3 and it will be noted that the elongated protective members 10 are supported for free rotary movement in slots 8 of the bell cranks.
  • one end of the rotary swing-shaft 4 extends through a bearing 12 in a side wall 5 of the machine frame and beyond the latter wall 5 this end of the shaft 4 is fixed with a switching-actuating lever 13.
  • This lever 13 has a top surface extending along an arc of a circle and formed with an axially extending groove 14 which receives the bottom end of the switch plunger 15 of a control current limit switch 16.
  • the configuration of the bottom end of the plunger 15 conforms to the cross-sectional configuration of the slot 14, so that even a slight angular turning of the lever 13 of the switch-actuating means will result in actuation of the limit switch 16.
  • the lever 13 pivotally carries a block 17 which is freely turnable with respect to the lever 13 While being carried thereby.
  • This block 17 is formed with a through-bore, and an elongated rod 18 extends freely through the bore of the block 17 in opposite directions beyond the latter.
  • a pair of compression springs 19 and 20 are coiled about the rod 18 which is pivotally supported at its right end, as viewed in FIG. 1, on a machine wall 5 and which carries at its left end, as viewed in FIG. 1, a pair of lock nuts.
  • the block 17 is acted upon by the equal and opposite forces of the springs 18 and 19, and in this way the lever 13 is yieldably and resiliently urged to the neutral position of FIG. 1 where the slot 14 registers with the plunger 15.
  • the shaft 4 swings with the lever 13, and thus the springs 19 and 20 serve to determine the neutral or operating position of the safety device of my invention, this position being indicated mostly clearly in FIG. 1.
  • the central neutral or operating position of the parts as determined by the springs 19 and 20 and as shown in FIG. 1 corresponds to the safety position of the safety device.
  • a safety device comprising a swingable switch-actuating assembly for actuating a control current limit switch to stop the operation of the machine, said assembly including a pair of elongated protective members extending parallel to and respectively located adjacent said cylinders, a rotary shaft situated at said elevation of said contact gap and extending parallel to the axes of said cylinders a pair of bell cranks fixed to said rotary shaft for turning movement therewith said bell cranks respectively having arms extending to and carrying said elongated protective members, mounting means mounting said protective members on said bell crank arms for free rotary movement as 6 well as for movement along said arms toward and away from said rotary shaft, and spring means urging said protective members away from said shaft so that said protective members are displaceable toward said shaft only in opposition to said spring means.
  • each of said protective members is in the form of an elongated tube.
  • said mounting means includes elongated tubular portions of said bell crank arms which are respectively formed with longitudinally extending slots which receive ends of said protective members, said ends of said protective members respectively being freely turnable in said slots of said arms and said spring means including compression springs extending along the hollow interiors of said arms and engaging said ends of said protective members for urging the latter to the ends of said slots which are most distant from said shaft.
  • said means forming part of said plunger and switch-actuating lever includes a cut-out formed in an end of said lever and receiving said switch plunger at an end of the latter, said cut-out having a configuration conforming subtstantially to that of said end of said plunger.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Rotary Presses (AREA)
US700832A 1967-03-11 1968-01-26 Safety device for machines having oppositely rotating cylinders Expired - Lifetime US3498217A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DESC040377 1967-03-11

Publications (1)

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US3498217A true US3498217A (en) 1970-03-03

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Application Number Title Priority Date Filing Date
US700832A Expired - Lifetime US3498217A (en) 1967-03-11 1968-01-26 Safety device for machines having oppositely rotating cylinders

Country Status (3)

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US (1) US3498217A (de)
DE (1) DE1561070B1 (de)
GB (1) GB1177321A (de)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3665846A (en) * 1971-01-11 1972-05-30 Jurgen Schiunke Protective shield for use at the bite of rollers for paper and textile calenders
US3978701A (en) * 1975-11-06 1976-09-07 Alfred L. Burden Power roll mill guarding device
US4295421A (en) * 1979-04-07 1981-10-20 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Safety device for guarding nips in a sheet-fed rotary printing press
US4306439A (en) * 1980-01-07 1981-12-22 Modine Manufacturing Company Safety device
US4416035A (en) * 1981-10-09 1983-11-22 Horn & Gladden Lint Cleaner Company, Inc. Safety bar cutoff and brake
US4454631A (en) * 1981-10-09 1984-06-19 Horn And Gladden Lint Cleaner Co., Inc. Improved safety bar cutoff and brake method
US4454812A (en) * 1981-11-06 1984-06-19 Veb Kombinat Polygraph "Werner Lamberz" Leipzig Safety device for counter rollers in a printing machine
US4669380A (en) * 1984-11-16 1987-06-02 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Safety device for a sheet-fed rotary press
US4765240A (en) * 1986-03-29 1988-08-23 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Safety rail for accident prevention in rotary printing machines
US4867055A (en) * 1987-06-10 1989-09-19 Kleinewefers Gmbh Guard for the nips of rolls in calenders
US5538490A (en) * 1993-02-15 1996-07-23 Fujitsu Limited Safety bar mechanism and sheet processing device having a safety bar mechanism
US5537922A (en) * 1994-05-14 1996-07-23 Heidelberger Druckmaschinen Ag Press-on device in a printing unit of a printing press
US5735207A (en) * 1995-11-04 1998-04-07 Heidelberger Druckmaschinen Aktiengesellschaft Device for adjusting guide yokes in rotary printing presses
US5832825A (en) * 1996-03-20 1998-11-10 Hiedelberger Druckmaschinen Ag Safety device in a zone for infeeding a web of material into a folder
US5921179A (en) * 1997-02-12 1999-07-13 Heidelberger Druckmaschinen Ag Guard on contrarotatable cylinders of a printing press
US6009801A (en) * 1997-05-26 2000-01-04 Heidelberger Druckmaschinen Aktiengesellschaft Method for safeguarding or protecting against penetration by foreign bodies into a roller nip
US20080216687A1 (en) * 2007-03-06 2008-09-11 Man Roland Druckmaschinen Ag Printing unit of a web-fed printing press
US20100294149A1 (en) * 2009-05-19 2010-11-25 Komori Corporation Intaglio printing press

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19500586C2 (de) * 1995-01-11 1999-03-25 Roland Man Druckmasch Sicherheitsvorrichtung an Rotationsdruckmaschinen

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1643475A (en) * 1926-12-01 1927-09-27 Jr George W Smith Wringer-roll guard
US2163473A (en) * 1936-12-31 1939-06-20 Simon Abram Machinery guard
US2271745A (en) * 1940-10-26 1942-02-03 Vandercook & Sons Proof press
US2778896A (en) * 1955-01-24 1957-01-22 Tollefsen Reed Automatic controllable "g" impact switch
US3066202A (en) * 1960-06-21 1962-11-27 Controls Co Of America Inertia sensitive snap switch
US3256395A (en) * 1960-07-13 1966-06-14 Maschf Augsburg Nuernberg Ag Operator safety device for rotating machinery parts
US3377884A (en) * 1965-11-18 1968-04-16 Wilmot Breeden Ltd Guarding of machine tools

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE766210C (de) * 1943-02-14 1954-02-08 Faber & Schleicher A G Sicherungsvorrichtung an gegenlaeufigen Walzen, insbesondere in Druckmaschinen, Kalandern u. dgl.
NL123320C (de) * 1959-05-19
CH407173A (de) * 1963-11-07 1966-02-15 Color Metal Ag Sicherheitsvorrichtung an gegenläufigen Walzen, z. B. für Offset-Druckmaschinen

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1643475A (en) * 1926-12-01 1927-09-27 Jr George W Smith Wringer-roll guard
US2163473A (en) * 1936-12-31 1939-06-20 Simon Abram Machinery guard
US2271745A (en) * 1940-10-26 1942-02-03 Vandercook & Sons Proof press
US2778896A (en) * 1955-01-24 1957-01-22 Tollefsen Reed Automatic controllable "g" impact switch
US3066202A (en) * 1960-06-21 1962-11-27 Controls Co Of America Inertia sensitive snap switch
US3256395A (en) * 1960-07-13 1966-06-14 Maschf Augsburg Nuernberg Ag Operator safety device for rotating machinery parts
US3377884A (en) * 1965-11-18 1968-04-16 Wilmot Breeden Ltd Guarding of machine tools

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3665846A (en) * 1971-01-11 1972-05-30 Jurgen Schiunke Protective shield for use at the bite of rollers for paper and textile calenders
US3978701A (en) * 1975-11-06 1976-09-07 Alfred L. Burden Power roll mill guarding device
US4295421A (en) * 1979-04-07 1981-10-20 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Safety device for guarding nips in a sheet-fed rotary printing press
US4306439A (en) * 1980-01-07 1981-12-22 Modine Manufacturing Company Safety device
US4416035A (en) * 1981-10-09 1983-11-22 Horn & Gladden Lint Cleaner Company, Inc. Safety bar cutoff and brake
US4454631A (en) * 1981-10-09 1984-06-19 Horn And Gladden Lint Cleaner Co., Inc. Improved safety bar cutoff and brake method
US4454812A (en) * 1981-11-06 1984-06-19 Veb Kombinat Polygraph "Werner Lamberz" Leipzig Safety device for counter rollers in a printing machine
US4669380A (en) * 1984-11-16 1987-06-02 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Safety device for a sheet-fed rotary press
US4765240A (en) * 1986-03-29 1988-08-23 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Safety rail for accident prevention in rotary printing machines
US4867055A (en) * 1987-06-10 1989-09-19 Kleinewefers Gmbh Guard for the nips of rolls in calenders
US5538490A (en) * 1993-02-15 1996-07-23 Fujitsu Limited Safety bar mechanism and sheet processing device having a safety bar mechanism
US5537922A (en) * 1994-05-14 1996-07-23 Heidelberger Druckmaschinen Ag Press-on device in a printing unit of a printing press
US5735207A (en) * 1995-11-04 1998-04-07 Heidelberger Druckmaschinen Aktiengesellschaft Device for adjusting guide yokes in rotary printing presses
US5832825A (en) * 1996-03-20 1998-11-10 Hiedelberger Druckmaschinen Ag Safety device in a zone for infeeding a web of material into a folder
US5921179A (en) * 1997-02-12 1999-07-13 Heidelberger Druckmaschinen Ag Guard on contrarotatable cylinders of a printing press
US6009801A (en) * 1997-05-26 2000-01-04 Heidelberger Druckmaschinen Aktiengesellschaft Method for safeguarding or protecting against penetration by foreign bodies into a roller nip
US6257134B1 (en) 1997-05-26 2001-07-10 Heidelberger Druckmaschinen Aktiengesellschaft Device for safeguarding or protecting against penetration by foreign bodies into a roller nip
US20080216687A1 (en) * 2007-03-06 2008-09-11 Man Roland Druckmaschinen Ag Printing unit of a web-fed printing press
US20100294149A1 (en) * 2009-05-19 2010-11-25 Komori Corporation Intaglio printing press
EP2253468A3 (de) * 2009-05-19 2011-11-30 Komori Corporation Tiefdruckpresse
US8925453B2 (en) 2009-05-19 2015-01-06 Komori Corporation Intaglio printing press

Also Published As

Publication number Publication date
DE1561070B1 (de) 1970-03-12
GB1177321A (en) 1970-01-07

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