EP0412720A2 - Vorrichtung und Verfahren zum Bedrucken von Metallplatten - Google Patents

Vorrichtung und Verfahren zum Bedrucken von Metallplatten Download PDF

Info

Publication number: EP0412720A2
Authority: EP; European Patent Office
Prior art keywords: cylinders; stop means; speed; sheet; impression cylinder
Prior art date: 1989-08-09
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

EP90308512A

Other languages

English (en)

French (fr)

Other versions

EP0412720B1 (de

EP0412720A3 (en

Inventor

Christopher John Morrison Southworth

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.)

Crabtree of Gateshead Ltd

Original Assignee

Crabtree of Gateshead 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.)

1989-08-09

Filing date

1990-08-02

Publication date

1991-02-13

1990-08-02 Application filed by Crabtree of Gateshead Ltd filed Critical Crabtree of Gateshead Ltd

1991-02-13 Publication of EP0412720A2 publication Critical patent/EP0412720A2/de

1991-05-08 Publication of EP0412720A3 publication Critical patent/EP0412720A3/en

1994-12-07 Application granted granted Critical

1994-12-07 Publication of EP0412720B1 publication Critical patent/EP0412720B1/de

2010-08-02 Anticipated expiration legal-status Critical

Status 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
- B41F7/00—Rotary lithographic machines
- B41F7/16—Rotary lithographic machines for printing on non-deformable material, e.g. sheet metal
- 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
- B41F21/12—Adjusting leading edges, e.g. front stops

Definitions

This invention relates to a method of and apparatus for printing on metal sheets.
Such apparatus is commonly known as a sheet-fed metal decorating press.
Known apparatus for printing on metal sheets comprises impression and blanket cylinders in rolling contact with each other, between which the sheets are passed successively, and a plate cylinder in rolling contact with the blanket cylinder. All three cylinders are geared together so that adjacent cylinders contra-rotate at the same constant peripheral speed.
the plate cylinder carries a printing plate which is pre-inked in known manner and which transfers ink to the blanket cylinder which transfers it in turn to each metal sheet.
the blanket cylinder carries a rubber blanket which is, say, 2 mm. thick.
each sheet relative to the impression cylinder carries two axially-spaced cyclically-moveable stops, which are known as front lays, for the front edge of the sheet.
These stops comprise the free ends of respective levers which are pivoted on the impression cylinder inside its periphery.
the levers are actuated by stationary cam means which cause them to extend and retract during the appropriate part of each revolution of the impression cylinder.
the action of the cam means is such that during the operative part of their retraction the stops travel substantially tangentially towards the impression cylinder.
the path of the stops relative to the impression cylinder is such that when the sheet makes contact with the stops at the start of the operative part of their retraction, the speed of travel of the stops is appreciably less than the peri pheral speed of the impression and blanket cylinders.
Each sheet is fed towards the nip of said cylinders on a flat table known as an infeed by chain-driven spring-loaded pusher means at substantially the same speed as said peripheral speed until it contacts a location face on the stops, when it is abruptly decelerated to the speed of the stops at that point in their cycle and then allowed to accelerate progressively back to said peripheral speed as the stops return to their retracted position.
the table is normally horizontal but need not be. With this arrangement, comparatively high forces must be exerted by the pusher means in order to accelerate the sheet and avoid its being left behind by the stops, just before it is clamped to the impression cylinder and then enters the nip, by a distance which may be of the order of 0.15 mm.
the object of the present invention is to avoid the disadvantages caused by the need to accelerate the sheet subsequent to its deceleration.
a method of printing on metal sheets by successively pushing them on a table towards the nip of impression and blanket cylinders which contra-rotate at the same constant peripheral speed; causing the front edge of each sheet to make contact, prior to entering the nip, with cyclically-moveable stop means carried by the impression cylinder; and finally passing each sheet between said cylinders whilst maintaining it in contact with the stop means; is characterised in that each sheet is pushed, prior to contacting a location face on the stop means, at a speed faster than the constant peripheral speed of said cylinders, and thereafter until it enters the nip is restrained by the stop means to travel at a speed substantially the same as said constant peripheral speed.
apparatus for printing on metal sheets comprising impression and blanket cylinders which contra-rotate at the same constant peripheral speed, means for successively pushing the sheets on a table towards the nip of said cylinders, and cyclically-moveable stop means for the front edge of each sheet which stop means are carried by the impression cylinder, is characterised in that the stop means are constrained to extend and retract relative to the impression cylinder during the appropriate part of each revolution thereof in a substantially involute path the base circle of which is the periphery of the impression cylinder.
the stop means comprise the free ends of two cam-actuated levers pivoted on the impression cylinder outside its periphery, so that the stop means are constrained to move relative to said cylinder in an arcuate path approximating to an involute curve.
a sheet-fed metal decorating press comprises a blanket cylinder 101 in rolling contact with an impression cylinder 102 and a plate cylinder 103.
the cylinders 101, 102 and 103 are geared together so that adjacent cylinders contra-rotate at the same constant peripheral speed. Sheets are successively fed towards the nip of the blanket cylinder 101 and the impression cylinder 102 on a horizontal flat table 104 known as an infeed by chain-driven spring-loaded pusher means (not shown).
the plate cylinder 103 has secured on its periphery a curved printing plate 105 which is pre-inked in known manner and which transfers ink to the blanket cylinder 101 which transfers it in turn to each metal sheet.
the blanket cylinder 101 has secured on its periphery a rubber blanket 106.
said cylinder In order accurately to register, that is to say locate in position, each sheet relative to the impression cylinder 102, said cylinder carries two axially-spaced cyclically-moveable stop means indicated generally at 107, which are known as front lays, for the front edge of the sheet. Devices (not shown) for gripping the front edge of the sheet but lacking stops are also provided in known manner. As thus far described, the press is conventional.
each stop means 107 is disposed at the free end of a lever 108 which is pivoted about a common axis 109 on the impression cylinder 102 outside its periphery.
the stop means 107 has an inclined face 110, a location face 111, and a gripper blade 112 one end of which projects beyond the location face 111.
the stop means is mounted on the lever 108 by means of an adjustment device 113 so that the distance between its location face 111 and the axis 109 can be varied.
the two levers 108 are cyclically moveable in unison by an arrangement including a shaft 114 journalled in the impression cylinder 102 parallel to its axis and inside its periphery, and having secured at one of its ends an arm 115 carrying a cam follower in the form of a roller 116. Said roller engages with a stationary cam (not shown) in known manner.
Each lever 108 is pivotally connected by a link 117 to another link 118 which is pivotally connected to one of two arms 119 secured to the shaft 114.
the link 118 and the arm 119 are urged together by spring means (not shown) against an adjustable stop 120 so that they tend to move as one.
Pusher means (not shown) of conventional construction comprise three mechanisms operating in series to advance each sheet along the table 104 - first of all belt means; then a first chain drive moving faster than the belt means and having dogs which positively engage the rear edge of the sheet; and lastly a second chain drive having spring-loaded pushers which resiliently engage the rear edge of the sheet to allow it to decelerate when it contacts the location face 111, and when it has been clamped as hereinafter described are then lowered, returned towards the table 104, and raised to engage the next sheet.
the profile of the stationary cam is such that it acts as hitherto to cause extension and retraction of the stop means 107 through a suitable radial distance during the appropriate part of each revolution of the impression cylinder 102, said stop means travelling substantially along the tangent 122 towards top dead centre during the operative part of their retraction.
the location of the axis 109 outside the periphery of the impression cylinder 102 constrains the stop means 107 to move relative to said cylinder in an arcuate path closely approximating to the ideal path which is an involute curve the base circle of which is the periphery of said cylinder.
the speed of travel of the stop means 107 along the tangent 122 during the operative part of their retraction is substantially the same as the constant peripheral speed of the cylinders.
the second chain drive of the pusher means although conventionally constructed, is caused in novel manner to feed each sheet towards the nip of the blanket cylinder 101 and the impression cylinder 102 at a speed faster by, say, 13 per cent than the constant peripheral speed of the cylinders.
the sheet is approximately at position 45, that is to say at approximately 45 degrees before top dead centre, when the stop means 107 moves through the plane containing the surface of the table 104.
the sheet contacts the inclined face 110 of the stop means 107 approximately at position 32 and rides up the face 110 until it contacts the location face 111 at approximately 15 degrees before top dead centre, when it is abruptly decelerated to the speed of the stop means 107, that is to say to substantially the constant peripheral speed of the cylinders, and then continues to advance at that speed until it has been subsequently gripped and then rolled through the nip.
One advantage of not needing to accelerate the sheet is that high pusher forces are no longer required. This enables thinner or softer sheets to be fed to the press, for example steel sheets only 0.12 mm. thick, or aluminium sheets.
Another advan tage resulting from the lower pusher force is that sideways location of the sheets, which is particularly difficult when the sheets are not square or rectangular, is rendered easier.
a further advantage resulting from each sheet travelling at its correct speed and position for a significant length of time prior to entering the nip is that accurate registration of the sheets is achieved, enabling higher printing speeds to be employed.
ambit of the invention includes stop means moveable relative to the impression cylinder in a true involute path as well as in an arcuate or other path approximating closely to an involute curve.

Landscapes

Engineering & Computer Science (AREA)
Mechanical Engineering (AREA)
Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
Inking, Control Or Cleaning Of Printing Machines (AREA)
Transmission Devices (AREA)

EP19900308512 1989-08-09 1990-08-02 Vorrichtung und Verfahren zum Bedrucken von Metallplatten Expired - Lifetime EP0412720B1 (de)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
GB898918175A GB8918175D0 (en)	1989-08-09	1989-08-09	A method of and apparatus for printing on metal sheets
GB8918175		1989-08-09

Publications (3)

Publication Number	Publication Date
EP0412720A2 true EP0412720A2 (de)	1991-02-13
EP0412720A3 EP0412720A3 (en)	1991-05-08
EP0412720B1 EP0412720B1 (de)	1994-12-07

Family

ID=10661380

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP19900308512 Expired - Lifetime EP0412720B1 (de)	1989-08-09	1990-08-02	Vorrichtung und Verfahren zum Bedrucken von Metallplatten

Country Status (3)

Country	Link
EP (1)	EP0412720B1 (de)
DE (2)	DE69014762T2 (de)
GB (1)	GB8918175D0 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP0502481A1 (de) *	1991-03-04	1992-09-09	Fuji Kikai Kogyo Kabushiki Kaisha	Vorrichtung zur Positionierung von Druckstücken zum Gebrauch in einer Druckmaschine
EP0596337A1 (de) *	1992-11-05	1994-05-11	MAN Roland Druckmaschinen AG	Vorrichtung für das registergerechte Anlegen von Druckplatten auf dem Plattenzylinder von Druckmaschinen
US5339731A (en) *	1991-12-03	1994-08-23	Crown Cork & Seal Company, Inc.	Method and apparatus for printing multicolored container body blanks in a single pass
CN104703799A (zh) *	2012-07-06	2015-06-10	Kba金属印刷有限公司	用于传送单张承印材料、特别是刚性板的传送设备和方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE102012211784A1 (de)	2012-07-06	2014-01-09	Kba-Metalprint Gmbh	Fördervorrichtung und ein Verfahren zum Fördern von Bedruckstoffbogen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US2699941A (en) *	1949-12-15	1955-01-18	Huck Company	Registering and gripper means for sheet-fed printing presses
US2809831A (en) *	1954-11-10	1957-10-15	American Can Co	Sheet feeding and gauging mechanism

1989
- 1989-08-09 GB GB898918175A patent/GB8918175D0/en active Pending
1990
- 1990-08-02 DE DE1990614762 patent/DE69014762T2/de not_active Expired - Fee Related
- 1990-08-02 EP EP19900308512 patent/EP0412720B1/de not_active Expired - Lifetime
- 1990-08-02 DE DE1990308512 patent/DE412720T1/de active Pending

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP0502481A1 (de) *	1991-03-04	1992-09-09	Fuji Kikai Kogyo Kabushiki Kaisha	Vorrichtung zur Positionierung von Druckstücken zum Gebrauch in einer Druckmaschine
US5253583A (en) *	1991-03-04	1993-10-19	Fuji Kikai Kogyo Kabushiki Kaisha	Device for positioning printing material for use in a printing apparatus
US5339731A (en) *	1991-12-03	1994-08-23	Crown Cork & Seal Company, Inc.	Method and apparatus for printing multicolored container body blanks in a single pass
EP0596337A1 (de) *	1992-11-05	1994-05-11	MAN Roland Druckmaschinen AG	Vorrichtung für das registergerechte Anlegen von Druckplatten auf dem Plattenzylinder von Druckmaschinen
CN104703799A (zh) *	2012-07-06	2015-06-10	Kba金属印刷有限公司	用于传送单张承印材料、特别是刚性板的传送设备和方法

Also Published As

Publication number	Publication date
DE69014762D1 (de)	1995-01-19
DE69014762T2 (de)	1995-04-13
EP0412720B1 (de)	1994-12-07
GB8918175D0 (en)	1989-09-20
EP0412720A3 (en)	1991-05-08
DE412720T1 (de)	1991-10-17

Legal Events

Date	Code	Title	Description
1990-12-29	PUAI	Public reference made under article 153(3) epc to a published international application that has entered the european phase	Free format text: ORIGINAL CODE: 0009012
1991-02-13	AK	Designated contracting states	Kind code of ref document: A2 Designated state(s): DE FR GB NL
1991-03-18	PUAL	Search report despatched	Free format text: ORIGINAL CODE: 0009013
1991-05-08	AK	Designated contracting states	Kind code of ref document: A3 Designated state(s): DE FR GB NL
1991-08-02	EL	Fr: translation of claims filed
1991-08-16	TCNL	Nl: translation of patent claims filed
1991-10-17	DET	De: translation of patent claims
1991-12-27	17P	Request for examination filed	Effective date: 19911016
1993-08-25	17Q	First examination report despatched	Effective date: 19930713
1994-10-21	GRAA	(expected) grant	Free format text: ORIGINAL CODE: 0009210
1994-12-07	AK	Designated contracting states	Kind code of ref document: B1 Designated state(s): DE FR GB NL
1994-12-23	ET	Fr: translation filed
1995-01-19	REF	Corresponds to:	Ref document number: 69014762 Country of ref document: DE Date of ref document: 19950119
1995-10-12	PLBE	No opposition filed within time limit	Free format text: ORIGINAL CODE: 0009261
1995-10-12	STAA	Information on the status of an ep patent application or granted ep patent	Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT
1995-11-29	26N	No opposition filed
2002-01-01	REG	Reference to a national code	Ref country code: GB Ref legal event code: IF02
2002-08-28	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: FR Payment date: 20020828 Year of fee payment: 13
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2002-08-30	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: NL Payment date: 20020830 Year of fee payment: 13
2002-10-31	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: DE Payment date: 20021031 Year of fee payment: 13
2003-08-02	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20030802
2004-03-01	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: NL Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20040301
2004-03-02	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20040302
2004-03-24	GBPC	Gb: european patent ceased through non-payment of renewal fee	Effective date: 20030802
2004-04-30	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20040430
2004-05-03	NLV4	Nl: lapsed or anulled due to non-payment of the annual fee	Effective date: 20040301
2004-06-04	REG	Reference to a national code	Ref country code: FR Ref legal event code: ST

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