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US2950674A - Trip mechanism for printing machines - Google Patents

Trip mechanism for printing machines Download PDF

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Publication number
US2950674A
US2950674A US536642A US53664255A US2950674A US 2950674 A US2950674 A US 2950674A US 536642 A US536642 A US 536642A US 53664255 A US53664255 A US 53664255A US 2950674 A US2950674 A US 2950674A
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US
United States
Prior art keywords
machine
printing
cylinder
hydraulic
cylinders
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US536642A
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English (en)
Inventor
Harold M Taylor
Derek A Stevenson
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.)
RW Crabtree and Sons Ltd
Original Assignee
Crabtree & Sons Ltd R
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
Priority claimed from GB2835154A external-priority patent/GB815811A/en
Application filed by Crabtree & Sons Ltd R filed Critical Crabtree & Sons Ltd R
Application granted granted Critical
Publication of US2950674A publication Critical patent/US2950674A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/04—Tripping devices or stop-motions
    • B41F33/08—Tripping devices or stop-motions for starting or stopping operation of cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/24—Cylinder-tripping devices; Cylinder-impression adjustments
    • B41F13/34—Cylinder lifting or adjusting devices
    • B41F13/40—Cylinder lifting or adjusting devices fluid-pressure operated

Definitions

  • This invention relates to printing machines and par- I ticularly sheet-fed machines: such machines operate in constantly recurring cycles in each of which a sheet is individually presented, registered, printed and passed on as a printed product, it may be to delivery or to further printing operation.
  • the machines incorporate mechanisms to trip certain parts of the machine such as the printing and impression components, the inking mechanism, the moistening motion in the case of a lithographic machine and the sheettaking mechanism which takes a sheet in registered position: these mechanisms must be actuated at a certa n point in the printing cycle when required to do so by a check action which checks whether a sheet is properly presented and registered.
  • trip mechanisms are normally actuated by some moving part of the machine so as to be properly timed in the printing cycle and the check mechanism efiects its control by establishing connection between them and the parts to be tripped.
  • the trip mechanisms have generally been mechanically operated and the check mechanism has similarly been operated and has efiected its control on the trip mechanisms by some form or other of mechanical transmission: this all involves mechanical parts such as links, levers, shafts and so on and in the result sheet printing machines are somewhat complex, consisting as they do of a large number of parts which are not always easy to accommodate, are sometimes awkward and difiicult of access or render access to other parts of the machine diflicult, and add to the cost both of the machine and of its maintenance.
  • the main object of this invention is to provide an improved arrangement of trip mechanisms and check control for them.
  • the present invention consists in providing an improved hydraulic transmission arranged to transmit in timed relation to the operation cycles of the machine hydraulic impulses for actuating the trip mechanisms.
  • the invention thus enables a considerable simplification to be made in such machines and the system according to this invention is flexible and so avoids positional difiiculties and enables easy access to the parts of the machine to be readily provided.
  • the check mechanism itself preferably also is arranged to effect its control by hydraulic transmission.
  • This control unit can comprise a control box having a cam shaft geared to some part of the machine and having cams one for each trip mechanism involved, the cams operating, at
  • hydraulic valves or transmitters regulating the application of hydraulic pressure to hydraulic receivers to effect the actuation of the trip mechanisms.
  • the check mechanism would also exercise its control on the trip mechanisms by an hydraulic transmission but a mechanical transmission may be used.
  • a further advantage of this invention consists in that a smaller motor would be required to operate the normal printing parts of the machine: the power required to operate the trip mechanisms need no longer be drawn from a moving part of the machine, but could be supplied by a separately driven hydraulic pump, the pump charging an hydraulic condenser from which the hydraulic system would draw its supply of power.
  • the present invention is applicable to sheet fed printing machines, regardless of their manner of effecting the printing operation, i.e. whether by relief, lithographic or intaglio printing and in the case of lithographic printing by direct or off-set printing.
  • Figure 1 is a side elevation of a printing machine showing the invention applied to it
  • Figure 2 is a diagram showing the installation of the parts provided in accordance with the invention
  • Figures 3 and 4 are respectively a sectional side elevation and a transverse section of the control box shown in Figures 1 and 2.
  • Figure 5 is an elevation showing one of the trip mechanisms
  • Figure 6 is a diagram of a modified installation
  • Figures 7 and 8 are respectively a part-plan and an end elevation of a modified form of control box provided for the modified installation.
  • FIG. l shows one kind of machine to which the invention can be ap plied: this machine is what is known as a two-colour lithographic offset machine: it comprises an impression cylinder 1 having grouped about its periphery two blanket cylinders 2, 3, which receive impressions respectively from printing plate cylinders 4, 5, the impression applied to the blankets being transferred in succession to sheets S which are fed by a feed cylinder F to the impression cylinder 1.
  • the sheets, after receiving the impressions, are taken from the impression cylinder 1 by grippers on a chain conveyor C which conveys the sheets to a delivery (not shown) or to a further printing unit for further treatment.
  • the plates on the printing cylinders 4, 5 are moistened and are inked in the respective colours, respectively by moistening mechanisms 6, 7 and inking mechanisms 8, 9.
  • the hydraulic transmission comprises primary hydraulic motors in the form of double-acting ram and cylinder devices: the tripping of the plate, blanket and impression cylinders is effected in the arrangement selected by tripping the blanket cylinders 2 and 3 in two senses one from the impression cylinder and the other from the related plate cylinder.
  • the hydraulic motor for only one of these motions and for only one of the blanket cylinders is shown in Figure 2, this motor comprising a.
  • ram and cylinder devices 10, 11 one for each end of the cylinders: similarly a pair of double-acting ram and cylinder devices 12, 13 is provided to trip the inking rollers of each of the inking mechanisms 8, 9.
  • a double-acting ram and cylinder device 14 is provided for controlling the operation of grippers to feed the sheets to the machine It will be understood that ram and cylinder devices would be provided and located as desired at the various I points in a machine, those shown in Figure 2 being only by way of example.
  • each valve in one position connects the lines 15, 16 to the lines 18, 19 of an hydraulicpressure source or supply comprising for example a pump 20 which draws its supply from a sump 21 and a pressure accumulator 22, the lines 18, 19 thus being maintained under pressure and so holding the various ram and cylinder devices in a position (i.e. corresponding to on or o trip) as governed by the setting of the various valves 17.
  • an hydraulicpressure source or supply comprising for example a pump 20 which draws its supply from a sump 21 and a pressure accumulator 22, the lines 18, 19 thus being maintained under pressure and so holding the various ram and cylinder devices in a position (i.e. corresponding to on or o trip) as governed by the setting of the various valves 17.
  • each of the valves 17 is operated by a secondary hydraulic motor, e.g., a doubleacting ram and cylinder device the opposite sides of which are arranged to be connected to the pressure and return lines 25, 26 of a pilot or secondary hydraulic circuit including a pump 27 drawing its supply from the sump 21.
  • a change-over valve 28 arranged to be actuated by a mechanical link 29 from the check points.
  • the line 25 serves as the positive pressure or delivery line for the pump 27, and the line 26 serves as the low pressure or return line opening into the sump 21.
  • the valve 28 connects the positive line 25 to a line or conduit 30 which is connected to those sides of the various ram and cylinder operating the valves 17 which will hold the valves in the trip on position, i.e. with the cylinders and other parts in their operative position.
  • the pressure line 25 is transferred from the line 30 to a line or conduit 31 extending to the timing valve 23: v at a time governed by the valve 23 the line 31 is connected to lines 32 extending to the other sides of the various ram and cylinder devices for operating the various valves 17 by the resulting hydraulic impulse transmitted to it.
  • the valves 17 are thus thrown over at the required times and sequence to move the cylinders to the trip off position when the tripping operation is initiated by setting of the change-over valve 28 by the check responsive device 29.
  • the assembly comprises a shaft 32 to which the gear 24 is secured and on the shaft is a number of cams 33 one for each changeover valve 17.
  • Each cam is arranged to operate a pilot valve 35 which controls the communication between a pressure duct 36 connected to the line 31 and passages having connectors 37 one for each of the lines 32 leading to the ram and cylinders to operate the reversing valves 17.
  • the cams 33 are arranged for adjustment on the shaft 32 so that the timing of the operation of the corresponding valve 17 by the hydraulic impulse can be set to suit requirements.
  • the control valve assembly can obviously be adapted to suit the requirements of different machines by the selectionof the number of cams 33 provided.
  • timing control valve assembly which is contained -in a casing 38, the various lines can be taken to the points of supply and control as found most convenient: these lines are constituted by flexible pipes as is indicated most clearly in Figure 1 from which will be apparent the clean appearance of a machine according to this invention.
  • the flexibility of the transmission obviously avoids the difliculties of accommodation and location which the usual mechanical transmission presents and the pants required can readily be arranged and adapted to the various kinds and arrangements of sheet printing machines.
  • each of the blanket cylinders 2, 3 has its shaft ends mounted in two eccentric bearings 39, 40: movement of one bearing trips the blanket cylinder 2 (or 3) to and from the cooperating plate cylinder 4 (or 5): the other bearing trips the blanket cylinder to or from the impression cylinder 1.
  • Each of the eccentrics is arranged to be operated by a primary hydraulic motor or double acting cylinder device equivalent to those'shown at 10, 11 in Figure 2.
  • the ram rods 42 of the devices are connected to extensions 41 on the eccentrics: in the case of the connection 'for the ram and cylinder which trips the blanket cylinder from the impression cylinder 1, the stroke of the ram (indicated at 43 in Figure 5) is arranged to be adjustable to fine limits for which purpose the cylinder 44' for the ram receives a. screwed plug 45 which is adjustable through a worm and wheel gear 46 having an indicating scale 46.
  • the double acting ram and cylinders 12, 13 can operate through a link 47 on a shifting cam 48 which lifts and lowers the rollers of the inking mechanism; as to the moistening mechanisms 6, 7 these can if required to be operated be controlled as shown by an extension ofthe ram and cylinder operating the inking mechanisms, the extension operating through the levers 49 and links 50.
  • the controlled mechanism shall be capable of being tripped at the will of the operator but still at the proper time: this can be very simply effected by providing hand-operated change-over valves indicated at 51 as shunting the change-over valve 28, these valves 51 however still being under control of the timing valve 23.
  • the trip rod 54 is coupled to an arm 57 on a rock shaft 58 having a series of arms 59 one for each arm 57 and hence one for each valve 17: each arm 59 is connected via a rod 63 and springs 61 with a T-shaped rock lever having one of its arms 63 connected to one of the push-pull rods 52: each of the other arms of the rock lever is provided with two pins 64 to be engaged by abutments 65' on a forked component 65 which is caused to rise and fall by one of the cams 55 which operates through a bell-crank lever 66 biased by a spring 67 against the cam.
  • the check prepares the various reversing valves for operation but the actual time of operation is governed by the timing cams 55.
  • a rotary offset sheet printing machine comprising a printing cylinder; a blanket cylinder; an impression cylinder and an inking mechanism to ink the printing cylinder; means for feeding sheets to the machine for travel along a path through the machine determined by the machine cylinders; a number of double-acting hydraulic units each including ram means selectively subjectable to hydraulic pressure in opposite directions respectively to move the cylinders and the inking mechanism positively into and out of cooperation; a source of supply of pressure liquid to operate the said hydraulic units positively in opposite directions; reversing valves to control the application of pressure liquid to the ram means of the various hydraulic units selectively in opposite directions for operating said ram means positively both to establish and to relieve cooperation between the cylinders and the inking mechanism; a normally inactive valve-actuating means operated in synchronism with the machine for actuating the valves in a predetermined sequence to eifect relative movement between the cylinders and the inking mechanism; and sheet check means functioning in said path for controlling operation of said valve-actuating means.
  • a rotary sheet-fed olfset printing machine comprising a printing cylinder; a blanket cylinder; an impression cylinder and an inking mechanism to ink the printing cylinder; means for feeding sheets to the machine for travel along a path through the machine determined by the machine cylinders; a number of double-acting hydraulic units each including ram means selectively subjectable to hydraulic pressure in opposite directions respectively to move the cylinders and the inking mechanism positively into and out of cooperation; a source of supply of pressure liquid to operate the said hydraulic units positively in opposite directions; reversing valves to control the application of pressure liquid to the ram means of the various hydraulic units selectively in opposite directions for operating said ram means positively both to establish and to relieve cooperation between the cylinders and the inking mechanism; hydraulically operable means to actuate said valves; pilot valves to control the supply of pressure liquid to said hydraulically operable means; means operable in synchronism with the machine for operating said pilot valves in a predetermined sequence; and sheet check means for controlling conjointly with said pilot valves, the
  • a rotary sheet-fed offset printing machine comprising a printing cylinder; a blanket cylinder; an impression cylinder and an inking mechanism to ink the printing cylinder; means for feeding sheets to the machine for travel along a path through the machine determined by the machine cylinders; a number of double-acting hydraulic units each including ram means selectively subjectable to hydraulic pressure in opposite directions respectively to move the cylinders and the inking mechanism positively into and out of cooperation; a source of supply of pressure liquid to operate the said hydraulic units positively in opposite directions; reversing valves to control the application of pressure liquid to the ram means of the various hydraulic units selectively in opposite directions for operating said ram means positively both to establish and to relieve cooperation between the cylinders and the inking mechanism; a normally inactive valve-actuating means adapted to be rendered active to be operated in synchronism with the machine and comprising a mechanical transmission to actuate the said valves in a predetermined sequence to efiect relative movement between the cylinders and the inking mechanism; and sheet check means functioning in said
  • a rotary sheet-fed offset printing machine comprising a printing cylinder; a blanket cylinder; an impression cylinder and an inking mechanism to ink the printing cylinder; means for feeding sheets to the machine for travel along a path through the machine determined by the machine cylinders; a number of double-acting hydraulic units each including ram means selectively subjectable to hydraulic pressure in opposite directions respectively to move the cylinders and the inking mechanisni positively into and out of cooperation; a source of supply of pressure liquid to operate the said hydraulic units positively in opposite directions; reversing valves to' control the application of pressure liquid to the ram means of the various hydraulic units selectively inopposite directions for operating said ram means positively both to establish and ,to relieve cooperation between the cylinders and the inking'mechanism; a rotatable cam unit comprising a plurality of cams; means for driving said carn unit continuously during and in synchronisrn with said cylinders; 'normally'inefiective drive transmitting connections respectively between said cams and said revers

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
US536642A 1954-10-01 1955-09-26 Trip mechanism for printing machines Expired - Lifetime US2950674A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2835154A GB815811A (en) 1954-10-01 Improvements in printing machines

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DE (1) DE1098963B (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3114313A (en) * 1959-10-06 1963-12-17 Linotype Machinery Ltd On-off impression mechanism for two cylinder printing presses
US3167007A (en) * 1962-07-06 1965-01-26 Maschf Augsburg Nuernberg Ag Throw-in and throw-off control device for multicolor printing presses
US3196786A (en) * 1963-04-05 1965-07-27 Armstrong Cork Co Rotary printing press with movable transfer cylinder
US3234874A (en) * 1963-04-05 1966-02-15 Armstrong Cork Co Rotary transfer cylinder interrupter responsive to varying cylinder speeds
US3252415A (en) * 1962-07-09 1966-05-24 St Regis Paper Co Zoned tension control for printing press
US3306190A (en) * 1964-06-15 1967-02-28 Polytype Ag Control device for rotary printing apparatus
US3470816A (en) * 1964-04-02 1969-10-07 Roland Offsetmaschf Exchangeable printing subassembly for a rotary printing press
US3786749A (en) * 1972-04-07 1974-01-22 Rockwell International Corp Printing press cylinder support and control
US3894488A (en) * 1972-10-17 1975-07-15 American Bank Note Co Printing pressure control apparatus for intaglio press
US4838161A (en) * 1985-10-31 1989-06-13 Werner Lambertz Leipzig Veb Kombinat Polygraph Arrangement for reversing pressure of cylinders and rollers in printing machines

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1206111B (de) 1962-07-31 1965-12-02 Koppers Gmbh Heinrich Vorrichtung zum hydraulischen oder pneumatischen Betaetigen der Umstellorgane von Regenerativkoksofenbatterien
DE4013106C1 (de) * 1990-04-25 1991-12-12 Man Roland Druckmaschinen Ag, 6050 Offenbach, De
US5272975A (en) * 1990-04-25 1993-12-28 Man Roland Druckmaschinen Ag Throw-on/throw-off device for a blanket cylinder with a printing speed dependent control system for a sheet-fed offset press
DE4206627A1 (de) * 1992-03-03 1993-09-09 Heidelberger Druckmasch Ag Verfahren zur verringerung von dublieren beim ablaufen einer bogendruckmaschine

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2157240A (en) * 1935-02-21 1939-05-09 Ex Cell O Corp Valve structure
US2205720A (en) * 1936-10-01 1940-06-25 Crown Cork & Seal Co Printing press
US2216565A (en) * 1938-10-21 1940-10-01 Cottrell C B & Sons Co Throwoff mechanism for printing presses
US2267380A (en) * 1938-11-16 1941-12-23 Oilgear Co Hold-down system
US2419403A (en) * 1941-08-09 1947-04-22 Hoe & Co R Printing machine
US2539361A (en) * 1947-04-05 1951-01-23 American Steel Foundries Hydraulic circuit for operating hydraulic motors
US2689524A (en) * 1951-11-14 1954-09-21 James R Wood Throw-off mechanism for rotary offset presses
US2773445A (en) * 1953-03-19 1956-12-11 Harris Seybold Co Throwoff mechanism for printing presses

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE447305C (de) * 1924-07-18 1927-07-18 Louis Johannes Focke Vorrichtung zum An- und Abstellen der einzelnen Maschinenteile einer Rotationsdruckmaschine, insbesondere einer Rotationsgummidruckmaschine
DE566424C (de) * 1927-02-16 1932-12-16 Linotype Machinery Ltd An- und Abstellvorrichtung fuer die Farbauftragswalzen einer Rotationsdruckmaschine,die mit einer An- und Abstellvorrichtung fuer die Druckwerkszylinder ausgeruestet ist
CH173429A (fr) * 1933-03-18 1934-11-30 Alsacienne Constr Meca Machine à imprimer avec dispositif de commande de la position des rouleaux d'impression.
GB641102A (en) * 1938-11-16 1950-08-02 Oilgear Co Hydraulic mechanism for controlling the application of pressures between two or moreobjects
DE729553C (de) * 1941-04-27 1942-12-18 Johannisberg G M B H Maschf Vorrichtung zum An- und Abstellen des Druckzylinders gegenueber dem Formzylinder beiRotationstiefdruckmaschinen
US2539382A (en) * 1941-08-11 1951-01-30 Davidson Corp Sheet detector control mechanism for printing presses
US2569034A (en) * 1948-05-20 1951-09-25 Champlain Company Inc Hydraulic impression gear for printing presses

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2157240A (en) * 1935-02-21 1939-05-09 Ex Cell O Corp Valve structure
US2205720A (en) * 1936-10-01 1940-06-25 Crown Cork & Seal Co Printing press
US2216565A (en) * 1938-10-21 1940-10-01 Cottrell C B & Sons Co Throwoff mechanism for printing presses
US2267380A (en) * 1938-11-16 1941-12-23 Oilgear Co Hold-down system
US2419403A (en) * 1941-08-09 1947-04-22 Hoe & Co R Printing machine
US2539361A (en) * 1947-04-05 1951-01-23 American Steel Foundries Hydraulic circuit for operating hydraulic motors
US2689524A (en) * 1951-11-14 1954-09-21 James R Wood Throw-off mechanism for rotary offset presses
US2773445A (en) * 1953-03-19 1956-12-11 Harris Seybold Co Throwoff mechanism for printing presses

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3114313A (en) * 1959-10-06 1963-12-17 Linotype Machinery Ltd On-off impression mechanism for two cylinder printing presses
US3167007A (en) * 1962-07-06 1965-01-26 Maschf Augsburg Nuernberg Ag Throw-in and throw-off control device for multicolor printing presses
US3252415A (en) * 1962-07-09 1966-05-24 St Regis Paper Co Zoned tension control for printing press
US3196786A (en) * 1963-04-05 1965-07-27 Armstrong Cork Co Rotary printing press with movable transfer cylinder
US3234874A (en) * 1963-04-05 1966-02-15 Armstrong Cork Co Rotary transfer cylinder interrupter responsive to varying cylinder speeds
US3470816A (en) * 1964-04-02 1969-10-07 Roland Offsetmaschf Exchangeable printing subassembly for a rotary printing press
US3306190A (en) * 1964-06-15 1967-02-28 Polytype Ag Control device for rotary printing apparatus
US3786749A (en) * 1972-04-07 1974-01-22 Rockwell International Corp Printing press cylinder support and control
US3894488A (en) * 1972-10-17 1975-07-15 American Bank Note Co Printing pressure control apparatus for intaglio press
US4838161A (en) * 1985-10-31 1989-06-13 Werner Lambertz Leipzig Veb Kombinat Polygraph Arrangement for reversing pressure of cylinders and rollers in printing machines

Also Published As

Publication number Publication date
DE1098963B (de) 1961-02-09

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