US3764070A - Dampening fluid pump and metering apparatus for offset printing press - Google Patents

Dampening fluid pump and metering apparatus for offset printing press Download PDF

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Publication number
US3764070A
US3764070A US00268735A US3764070DA US3764070A US 3764070 A US3764070 A US 3764070A US 00268735 A US00268735 A US 00268735A US 3764070D A US3764070D A US 3764070DA US 3764070 A US3764070 A US 3764070A
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fluid
piston
passage
arm
inlet
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US00268735A
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English (en)
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D Glaser
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DIDDE Corp
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Didde Glaser Inc
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F7/00—Rotary lithographic machines
    • B41F7/20—Details
    • B41F7/24—Damping devices
    • B41F7/30—Damping devices using spraying elements

Definitions

  • ABSTRACT Dampening fluid is successively pumped in metered, very small individual volumes by a series of pump units to sprayers which nebulize the fluid and discharge the same onto a roll of an offset printing press.
  • Each pump unit has as its primary component a relatively small, resilient, tubular element which positively displaces a predetermined volume of fluid to its sprayer during each operating cycle by successively constricting and expanding its flow passage when a compressive force is applied and relaxed to the element in the direction of fluid flow therethrough.
  • a bubble-releasing and guiding channel in each element is open along its length to the flow passage of the element andhas an entry at the inlet end of the element configured to avoid the formation of a ledge or the like upon which bubbles could collect and thereby expand and contract during operation of the element to appreciably affect the volume of fluid displaced by the element.
  • Individual lever arm control assemblies for the pumping elements of the units are provided with adjustable limit stops to permit metering of the fluid from each element independently of all others.
  • Sheets-Sheet 2 DAMPENING FLUID PUMP AND METERING APPARATUS FOR OFFSET PRINTING PRESS
  • This invention relates to fluid supply apparatus which is especially suited for the pumping and metering of dampening fluid used to wet the printing plate of offset printing presses so non-printing areas will repel ink.
  • one of the most important objects of this invention is to provide apparatus for repeatedly supplying very small yet precise volumes of dampening fluid to the rolls of an offset printing press whereby print quality may be maintained on an exceptionally high level.
  • Another importnat object of the instant invention is to provide apparatus as aforesaid which, although displacing only a very small volume of fluid during each operating cycle, is capable of accurate variation of even this small fluid volume so that print quality may be accurately controlled to an even greater degree.
  • An additional important object of the present invention is to provide dampening apparatus having a simple, positive displacement, resilient, tubular'pumping elementor plug in which a minute yet precise pumping action is effected by successive constriction and expansion of its fluid passage in a transverse direction when a compressive force is applied to the plug in the direction of fluid flow therethrough, thereby permitting accurate metering of the volume of fluid displaced by simply controlling the extent of compression and expansion of the plug.
  • Another important object of the present invention is the provision of pumping apparatus as aforesaid wherein the provision of a directing channel or way for bubbles at the inlet end of the passagethrough the resilient element eliminates the formation ofa ledge at such inlet end which might otherwise collect bubbles that would be subject to expansion and compression during the pumping action. If bubbles were allowed to colledt they would appreciably affect the amount of fluid displaced by the pump because of the relatively small volume of dampening liquid delivered by the apparatus during each cycle.
  • An additional important object of the instant invention is to provide dampening apparatus as aforesaid, which utilizes a pneumatically powered sprayer for discharging a fine mist onto the roll or other surface to be dampened, wherein dampening fluid is delivered to the sprayer by virtue of a positive displacement, resilient pumping element, without the assistance of air pressure, so that the amount of fluid displaced during each pumping cycle may be very accurately metered by the use of mechanical, readily adjustable mechanism which controls the extent of compression and expansion of the element.
  • a further important object of the invention is to provide dampening apparatus as set forth above having a series of sprayers and pumping elements therefor, each of which is provided with a non-complex, yet highly accurate control assembly which allows compression and expansion of each element to be individually controlled independently of all other elements, whereby to provide local control of dampening fluid application across the full width of the roll or surface being dampened.
  • Another important object of the instant invention is the provision of such a control assembly for each pumping element which not only affords precise calibration for accurate regulation of the fluid displaced by each element, but, in addition, is designed for convenient and rapid installation and removal in order to provide access to the corresonding pumping elements for service or replacement thereof.
  • FIG. 1 is an essentially schematic view of the pumping and metering apparatus of the present invention shown in conjunction with rolls of an offset printing press;
  • FIG. 2 is an enlarged, fragmentary and elevational view of the appratus
  • FIG. 3 is an enlarged, fragmentary plan view of apparatus
  • FIG. 4 is a plan view similar to FIG. 3 with the apparatus rotated ninety degrees from its orientation of FIG. 3;
  • FIG. 5 is an enlarged, fragmentary cross-sectional view of the apparatus taken along line 5-5 of FIG. 4;
  • FIG. 6 is an enlarged, fragmentary cross-sectional view through the sprayer head of the apparatus taken along line 6-6 of FIG. 5;
  • FIG. 7 is an enlarged, detail view of an individual pump unit of the apparatus, showing the piston thereof fully extended;
  • FIG. 8 is a cross-sectional view through the unit taken along line 8-8 of FIG. 7;
  • FIG. 9 is an enlarged, detail view of the pumping unit similar to FIG. 7, but with the piston thereof forced into the unit to compress the resilient pumping element thereof.
  • the apparatus 10 is shown in FIG. 1 in its normal inclined disposition for spraying dampening fluid onto the rolls of an offset printing press.
  • Apparatus 10 is mounted directly on the press and may be disposed to direct a mist of the damping fluid onto a vibrator roll 12 of the press which ultimately transfers the fluid to theplate cylinder 14 via an intermediate form roll 16.
  • Ink may be supplied to plate cylinder 14 by a distributor roll 18, a second vibrator roll 20, and a pair of form rolls 22.
  • a small intermediate transfer roll 24 may be provided between form rolls l6 and 22 in order to supply a small quantity of ink to roll 12, such that spray from apparatus 10 is actually applied to the surface of ink film on roll 12 before the fluid is transferred to plate cylinder 14.
  • Apparatus 10 includes a main elongated, rectangular head 26 having a series of sprayers 28 spaced longitudinally along head 26.
  • a longitudinally extending air line 30 (FIG. 6) formed internally of head 26 has an external fitting 32 (FIGS. 3 and 4) which is adapted for connection to a source of pressurized air (not shown).
  • An annular inlet 34 for each sprayer 28 communicates line 30 with the nozzle 36 of each sprayer 28, and a fluid receiving bore 38 in head 26 for each sprayer 28 communicates with nozzle 36 and houses a reciprocable, spring-located cleaning pin 40.
  • a plurality of spaced apart dividing plates 42 are secured to head 26 along the length of the latter to define individual bays which contain the means for supplying fluid to each of the sprayers 28.
  • a pump unit 44 forming a part of apparatus 10, having a pump cylinder 46 which is partially received by head 26.
  • Each cylinder 46 has an elongated internal chamber which is closed at one end by an end wall 48 having an outlet port 50 therein which communicates with the corresponding bore 38 via a short line 52.
  • a stationary abutment block 54 lies against the end wall 48 within the chamber of cylinder 46, and has a counterbored outlet 56 therein aligned with port 50 which has a check valve 58 biased by a coil spring 60 away from port 50.
  • the diameter of outlet 56 in the area of the valve 58 is such that fluid may pass around the periphery of valve 58 for flow through outlet 56 toward port 50.
  • Passage 64 is smaller in diameter than the counterbored area of outlet 56, and the head of valve 58 is coneshaped such that valve 58 is biased into the outlet end of passage 64 by spring 60 to normally close passage 64.
  • the opposite inlet end of passage 64 is provided with a directing channel or way 66 which leads from the inlet end of passage 64 toward the outlet end thereof, but terminatesshort of outlet 56.
  • Channel 66 progressively diminishes in size as outlet 56 is approached and, as seen in FIG. 8, channel 66 tangentially intersects passage 64 on opposite lateral sides thereof.
  • each pump unit 44 Also normally housed within cylinder 46 of each pump unit 44 is a reciprocable piston 68 forming a part of mechanism 70 for manipulating pumping element 62.
  • a counter-bored inlet 72 in piston 68 communicates with passage 64 and has a check valve 74 normally biased into sealing engagement with an O-ring 76 by a coil spring 78.
  • the head of valve 74 is coneshaped to form a tight seal with O-ring 76 when valve 74 is seated thereagainst, but the periphery of valve 74 is not in tight engagement with the proximal counterbored area of inlet 72 so that fluid can, therefore, escape around valve 74 when the latter is unseated from O- ring 76.
  • the counterbored area of inlet 72 is of greater diameter than passage 64 such that the inlet end of the latter is encircled by the corresponding end of inlet 72. Note, however, that the entrance to channel 66 extends, transversely of passage 64, along the interface between piston 68 and plug 62 from within the dimensional limits of the counter-bored area of inlet 72 to outside of the same whereby to eliminate the existence of a ledge or the like or plug 62 at this location.
  • Inlet 72 is coupled via a short, flexible line 80 to a supply line 82 common to all of the units 44 and coupled with a source of dampening fluid (not shown).
  • Mechanism 70 for operating each pump unit 44 includes, in addition to each piston 68, a common drive shaft 84 hournaled by bearings in the plates 42 for rotation by a motor and chain assembly 86 supported by a large plate 88 at one end of head 26.
  • a series of eccentrics 90 are affixed to shaft 84, there being one eccentric 90 between each adjacent pair of plates 42, and a control assembly 92 is provided for each unit 44 for transmitting driving power from the corresponding eccentric 90 to the corresponding piston 68.
  • the main component of each control assembly 92 is a swingable lever arm 94 pivoted intermediate its ends by an external fulcrum shaft 96 which projects from the adjacent plate 42.
  • Each arm 94 has a rocker 98 thereon disposed below fulcrum 96 which bears against piston 68 during operation and has a suitable opening for clearing the short, flexible line 80.
  • the upper end of each arm 94 is provided with a follower bolt 100 whice is threadably received by arm 94 for adjustment toward and away from eccentric 90, there being a locking nut 102 provided on bolt 100 for retaining the latter in any one of a number of selected positions.
  • a bar 104 extending across the plates 42 is tied to the latter and to plate 88 and threadably carries a series of lower adjusting screws 106, one for each arm 94, for controlling the limits of swinging of the corresponding arms 94 to thereby control the length of stroke of the corresponding pistons 68.
  • the innermost end of each limit screw 106 is engageable with a flat, impact area 108 on the lowermost end of arm 94 during swinging of the latter to thereby determine its limits. As shwon best in FIG.
  • an enlarged, indicia-bearing poriion 1 10 may be provided on each limit screw 106 for cooperating with a suitable pointer 112 or equivalent structure on bar 104 for visually indicating the length of stroke which has been selected for piston 68 upon actuation of apparatus 10.
  • apparatus 10 is normally inclined at an attitude of 45 so that dampening fluid supplied to sprayers 28 is pumped uphill, thereby minimizing the formation of bubbles within the various flow lines and passages leading to sprayers 28.
  • actuation of the motor and chain assembly 86 causes drive shaft 84 to simultaneously rotate all of the eccentrics 90.
  • each eccentric rotates from its FIG. 5 position with the follower bolt bearing thereagainst, its corresponding arm 94 is swung in a counterclockwise direction viewing FIG. 5 as the end of arm 94 forces piston 68 inwardly against plug 62.
  • the rocking connection between rocker 98 and the outer face of piston 68 permits longitudinal movement of piston 68 at this time, while arm 94 swings in its arcuate path of travel.
  • the volume of fluid thus displaced travels through bore 38 .and into nozzle 36 of sprayer 28 where it is nebulized by air flowing into the latter from the annular inlet 34 for issuance as a fine mist onto the vibrator roll 12, as shown in FIG. 1.
  • piston 68 When piston 68 reaches its limit of extension, determined either by the throw of eccentric 90 or the selected setting for adjustable limit screw 106, the loading of passage 64 with fluid ceases. At this time, the components are again disposed as shown in FIGS. 5 and 7 in preparation for the next comprssion stroke of piston 68.
  • each piston 68 may have a stroke of from zero to 0.025 inches with a normal stroke (depending upon the particular ink conditions at hand) being approximately 0.005 inches.
  • the diameter of each passage 64 is preferably from five-eighths to seven-sixteenths inches. Accordingly, it can readily be seen that the volume of fluid pumped by each plug 62 during each pulse or cycle is extremely small so that only a fine mist is discharged to the press system as opposed to a high volume, heavy spray.
  • the unique design and mode of operation of plugs 62 permit such small quantities to be displaced without an attendant sacrifice in the degree of precision required for quality printing.
  • each plug 62 plays an important role in the displacement of consistently uniform amounts of fluid to the corresponding sprayer 28, such role being especially significant because of the small volume of fluid ejected by plugs 62.
  • the presence of one or more bubles trapped between inlet and outlet valves 74 and 58, respectively, during each operating cycle would appreciably affect the volume of fluid displaced as the bubbles expanded and contracted along with plug 62.
  • bubbles 'within the system move along the upper reaches of lines 80, 82 and inlet 72 and would normally become trapped against the outside of plug 62 adjacent the inlet end of passage 64 because of the decreased diameter of the latter with respect to inlet 72.
  • bubble channel 66 eliminates the existence of any collecting ledge on plug v62 for the bubbles such that the same are directed back into passage 64 for flow therethrough with their corresponding volume of fluid without appreciably affecting the true volume of fluid dispensed. Without channel 66, bubbles could collect over a prolonged period of operation and thereby have a significant effect on the amount of fluid displaced, and hence on the quality of printing performed by the press.
  • the adjustable limit screw 106 with its indicia portion 110 and the adjustable follower 100 for each pumpunit 44, permits local control of the volume of fluid sprayed on the roll 12 at all points across the width thereof.
  • the limit screws 106 may be rotated to their full of position corresponding to 0" on indicia portion 110 which causes their corresponding pistons 68 to be pushed to the full extent within their corresponding pump cylinders 46.
  • the follower bolt 100 for only extremely light engagement with their corresponding eccentrics 90 during rotation of the latter, no dampening fluid will be pumped to any of the sprayers 28.
  • control assemblies 92 may be accurately calibrated and certain of the sprayers 28 may be redneered completely inoperable, while still others are displacing their full volumes of fluid.
  • each control assembly 92 contributes to its ease of installation and removal.
  • the fulcrum shaft 96 for each assembly 92 is disposed exteriorly of its arm 94, the latter may be easily removed by loosening bolt and screw 106, removing line 80, and pulling arm 94 free from fulcrum 96 in either a downward or upward direction. Access is thereby easily gained to the pumping plug 62 for service or replacement thereof as required.
  • a resilient pumping element having a fluid passage extending therethrough
  • said structure further includes a housing receiving said element, said piston and said abutment.
  • abutment is provided with a valve for said outlet operable to open thelatter during compression of the element by said piston and to close the outlet during relaxation of the element by said piston.
  • said mechanism includes a reciprocable piston having a fluid inlet for said passage of greater cross-sectional size than said inlet end of the passage, said way extending, transversely of said passage, at least to the dimen-. sional limit of said inlet.
  • a pneumatically-powered sprayer communicating with said passage for receiving and nebulizing the metered volume of fluid displaced by said element.
  • said mechanism includes a reciprocable piston, drive means for operating the piston, and a control assembly between said driven means and the pistion for varying the stroke of the latter to thereby regulate the volume of fluid displaced by said element during each operating cycle.
  • said assembly includes a lever arm receiving power adjacent one end thereof from said drive means and transmitting said power adjacent its opposite end to said piston.
  • said assembly further includes a variable limit stop for said arm.
  • said drive means includes an eccentric, said assembly further including a variable follower for said eccentric on said arm adjacent said one end thereof.
  • a pneumatically-powered sprayer communicating with said passage for receiving and nebulizing fluid displaced by said element
  • said structure including a housing about said element and a stationary abutment at one end of said passage having a fluid outlet and a valve in said outlet
  • said mechanism including a reciprocable piston at the opposite end of said passage having a fluid inlet and a valve in said inlet
  • said mechanism further including a drive for said piston, swingable lever arm between said drive and the piston for transmitting power from said drive to the piston, and an adjustable limit stop for said arm for varying the stroke of said piston to thereby control the volume of fluid displaced by said element to said sprayer
  • said inlet valve in the piston and said outlet valve in the abutment being operable to close and open respectively during the compression stroke of said piston and to open and close respectively during the expansion stroke of the piston
  • said element being provided with a bubble way extending along said passage in open communication therewith from said opposite end of the passage toward saidone end thereof for directing bubbles into
  • said mechanism includes a reciprocable piston for each element, a drive shaft common to all of said pistons for operationg the same, and a control assembly for each piston between said shaft and the corresponding piston for varying the length of its stroke independently of the other pistons to thereby permit individual regulation of the fluid displaced to said sprayers.
  • each of said assemblies includes a lever arm receiving power adjacent one end thereof from said shaft and transmitting said power adjacent its opposite end to its corresponding piston, each of said assemblies further including an adjustable limit stop for controlling the swinging of its corresponding arm.
  • each of said units including a compressible, resilient pumping element having a passage therethrough for moving fluid to the corresponding sprayer in response to the application of repeated compressive forces to the element;
  • control assembly for each unit respectively operable to selectively vary the extent of compression and expansion of the corresponding pumping element independently of the other elements whereby to vary the volume of fluid delivered to the corresponding sprayer.
  • each of said units is provided with structure precluding both movement of its element in the direction of fluid flow therethrough and outward expansion of the element transversely of the direction of fluid flow when a compressive forceis applied to the element in said flow direction whereby to constrict said passage and force fluid from the same.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reciprocating Pumps (AREA)
  • Rotary Presses (AREA)
US00268735A 1972-07-03 1972-07-03 Dampening fluid pump and metering apparatus for offset printing press Expired - Lifetime US3764070A (en)

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US26873572A 1972-07-03 1972-07-03

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US (1) US3764070A (de)
JP (1) JPS4943705A (de)
AU (1) AU5692073A (de)
CA (1) CA996407A (de)
CH (1) CH558718A (de)
DE (1) DE2332827A1 (de)
FR (1) FR2190618A1 (de)
IT (1) IT989692B (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4873925A (en) * 1988-01-19 1989-10-17 Jimek International Ab Spray nozzle and valve assembly
EP0346573A2 (de) * 1988-06-16 1989-12-20 Rockwell International Corporation Eingefärbte Feuchtwalze für Steindruck
US5025722A (en) * 1990-01-22 1991-06-25 Ryco Graphic Manufacturing, Inc. Adjustable spray dampening system
US5673622A (en) * 1993-10-11 1997-10-07 Grafiskt Team Ab Device for wetting and cleaning cylinders in an offset rotary printing machine
US6250224B1 (en) 1997-10-27 2001-06-26 Hans J. Hofmann Powder sprayer
US6581802B1 (en) * 1999-06-29 2003-06-24 Baldwin Germany Gmbh Liquid supply device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51105068U (de) * 1975-02-18 1976-08-23

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4873925A (en) * 1988-01-19 1989-10-17 Jimek International Ab Spray nozzle and valve assembly
EP0346573A2 (de) * 1988-06-16 1989-12-20 Rockwell International Corporation Eingefärbte Feuchtwalze für Steindruck
EP0346573A3 (en) * 1988-06-16 1990-08-22 Rockwell International Corporation Inked dampener for lithographic printing
AU620387B2 (en) * 1988-06-16 1992-02-20 Goss International Asia-Pacific, Inc. Inked dampener for lithographic printing
US5025722A (en) * 1990-01-22 1991-06-25 Ryco Graphic Manufacturing, Inc. Adjustable spray dampening system
US5673622A (en) * 1993-10-11 1997-10-07 Grafiskt Team Ab Device for wetting and cleaning cylinders in an offset rotary printing machine
US6250224B1 (en) 1997-10-27 2001-06-26 Hans J. Hofmann Powder sprayer
US6581802B1 (en) * 1999-06-29 2003-06-24 Baldwin Germany Gmbh Liquid supply device

Also Published As

Publication number Publication date
IT989692B (it) 1975-06-10
FR2190618A1 (de) 1974-02-01
DE2332827A1 (de) 1974-01-17
AU5692073A (en) 1974-12-19
CA996407A (en) 1976-09-07
CH558718A (de) 1975-02-14
JPS4943705A (de) 1974-04-24

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Effective date: 19871125

Owner name: DIDDE CORPORATION

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