US3749050A - Cleaning system for wetting tank rollers - Google Patents

Cleaning system for wetting tank rollers Download PDF

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Publication number
US3749050A
US3749050A US00187761A US3749050DA US3749050A US 3749050 A US3749050 A US 3749050A US 00187761 A US00187761 A US 00187761A US 3749050D A US3749050D A US 3749050DA US 3749050 A US3749050 A US 3749050A
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United States
Prior art keywords
roll
tank
rolls
liquid
wetting
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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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US00187761A
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English (en)
Inventor
P Hastwell
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.)
Savin Business Machines Corp
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Savin Business Machines Corp
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Filing date
Publication date
Application filed by Savin Business Machines Corp filed Critical Savin Business Machines Corp
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/10—Apparatus for electrographic processes using a charge pattern for developing using a liquid developer
    • G03G15/101—Apparatus for electrographic processes using a charge pattern for developing using a liquid developer for wetting the recording material

Definitions

  • the apparatus disclosed therein comprises a movable carriage supporting the copy material for movement past a plurality of stations at which the copy material successively is charged, exposed to an image to be reproduced, prewet with clear developer liquid, subjected to developer liquid containing toner, wet following the developing operation and then dried.
  • the same unit is employed to accomplish boththe prewetting and postwetting operations.
  • This unit comprises a tank holding a supply of clear developer carrier liquid. Both a rubber roll and a metal roll are rotatably supported for movement on the tank with a portion thereof below the level of liquid in the tank. In the course of the prewetting operation, both rollers are active and carry the clear liquid up into contact with the surface of the copy material on the carriage.
  • the steel or metal roller is active while a wiper is brought into engagement with the surface of the rubber roll to wipe it clear of liquid to cause it to remove excessive liquid from the copy material.
  • Clear carrier liquid is supplied to the wetting tank by a system incorporating an electrostatically-operated filter which removes toner from the liquid being returned to the supply system from the tank.
  • the supply system is described in detail in my copending application referred to hereinabove.
  • My system effectively removes toner particles from the applicator rolls. It minimizes the possibility of spoiled or distorted color prints owing to the presence ofv toner on the applicator rolls. It is so arranged that it does not interfere with normal operation of the rolls in applying wetting material to the copy medium. It is relatively simple in construction and in operation for the result achieved thereby.
  • One object of my invention is to provide a cleaning system for wetting tank rollers which overcomes difficulties experienced with wetting systems of the prior art.
  • Another object of my invention is to provide a cleaning system for wetting tank rollers which effectively removes toner particles and the like collecting on the surfaces of the rollers.
  • Still another object of my invention is to provide a cleaning system for wetting tank rollers which minimizes the possibility of spoiled and distorted color prints resulting from material collecting on the wetting tank rollers.
  • a further object of my invention is to provide a cleaning system for wetting tank rollers which operates only during inactive periods of the wetting system.
  • a still further object of my invention is to provide a cleaning system for wetting tank rollers which is simple in construction and in operation for the result achieved thereby.
  • my invention contemplates the provision of a cleaning system for wetting tank rollers in which arcuate pile pads, elongated in the direction of the axis of the rollers are reciprocated during inactive periods of the wetting system into and out of engagement with the roller surfaces to scrub the surfaces thereof and to impart rotary motion to the rollers to move them through the clean liquid in the tank.
  • FIG. 1 is a sectional view of my cleaning system for wetting tank rollers.
  • FIG. 2 is a sectional view of the system illustrated in FIG. 1 taken along the line 2-2 of FIG. 1 and drawn on an enlarged scale.
  • FIG. 3 is a schematic view of one form of electrical circuit which may be used to control my cleaning system for wetting tank rollers.
  • the electrostatic copying machine with which my cleaning system for wetting tank rolls is used is of the type shown in my copending application referred to hereinabove.
  • the machine includes a carriage, indicated generally by the reference character 10, comprising respective rails 12 and 14 supported in sides 16 and 18 of the carriage by means of bolts 22 which position the rails 12 and 14 in slots 20 in the respective sides 16 and 18.
  • the carriage 10 supports respective guide rolls 24 and 26 which guide the copy material 28 so that the length thereof extends across the underside of the carriage between the rolls 24 and 26.
  • the carriage 10 is adapted to be driven from left to right as viewed in FIG. 1 in a prewetting step and from right to left as viewed in FIG. 1 in a postwetting step.
  • the wetting system indicated generally by the reference character 30, comprises a tank having respective ends 34 and 36 and a base 38.
  • An inlet conduit 40 extending through the base 38, leads into a sub-tank 42 positioned within the tank 32.
  • clear developer carrier liquid is supplied to inlet conduit 40 by a circulating system including an electrostatic filter (not shown) which removes dirt such as toner particles from the liquid.
  • Clean liquid supplied to the sub-tank 42 through the pipe 40 fills the sub-tank and flows over a wall 44 of sub-tank 42 into the tank 32.
  • the circulating system is such that the wetting fluid fills the tank 32 approximately to the level of the upper edge of the wall 44 of the sub-tank 42.
  • the fiuid passes through a screen 46 to an outlet conduit 48 leading back to the circulating system.
  • the wetting system 30 includes a postwet and prewet roller 50 which is formed of any suitable metal such for example as aluminum. Roll 50 is carried by a shaft 52 which is supported in respective shaft bearings 54 and 56 mounted in bores 58 and 60 in blocks 62 and 64 on the sides 34 and 36 of the tank 32. Respective springs 66 and 68 normally urge the shaft bearings 54 and 56 upwardly as viewed in FIG. 2.
  • System 30 also includes a prewetting roll 70 formed of a suitable material such as polyurethane rubber having a shore hardness preferably of about 20.
  • the shaft 72 of the roll 70 is supported in a manner similar to that described hereinabove in connection with roll 50.
  • the rails 12 and 14 engage the rollers 50 and 70 to rotate them and to move them slightly downwardly against the action of the associated bearing springs.
  • the surface of the paper is slightly spaced from the surfaces of the rolls 50 and 70 so that as the rolls carry wetting liquid upwardly into contact with the surface of the paper, the roll surfaces do not positively engage the paper so as to disturb the image thereon in the postwetting step.
  • the cleaning system indicated generally by the reference character 74, associated with the roll 50, includes a solenoid 76 supported in the sub-tank 42 by any suitable means.
  • An armature 78 associated with the solenoid 76 is located in a bore 80 in the solenoid 76.
  • a slot 82 in the armature 78 receives a guide rod 84 to guide the solenoid in its movement.
  • a spring 86 located in a bore 88 in the armature 78 normally urges the armature downwardly as viewed in FIGS. 1 and 2.
  • a rod 90 threaded into the armature 78 carries an arcuate plate which is elongated in the direction of the axis of roll 50.
  • a fabric 94 adhered to the upper surface of the plate 92 by any suitable means has a pile 96 which is adapted to engage the surface of roll 50.
  • the solenoid 76 when the carriage 10 is in position over the unit 30 the solenoid 76 is inactive and the pile 96 is out of engagement with the roll surface. However, when the solenoid is pulsed, the pile moves upwardly into engagement with the surface of roll 50. As it does so, it not only scrubs the surface of the roll, but it also initiates a rotary movement of the roll 50 in a direction which is determined by the initial set of the pile as it engages the roll.
  • I provide another cleaning system, indicated generally by the reference character 98, similar to that provided for the roll 50, for roll 70.
  • the system 98 includes a solenoid 100 having an armature 102 adapted to reciprocate vertically in a bore 104 in the solenoid 100.
  • a slot 106 adjacent to the lower end of armature 102 receives a guide rod 108.
  • a spring 110 positioned in a bore 112 in armature 102 normally urges the armature downwardly as viewed in FIG. 1.
  • a rod 114 threaded into the armature 102 carries an arcuate plate 116 which is elongated in the direction of the axis of roll 70.
  • a fabric 118 adhered to the upper surface of plate 116 has a pile 120 adapted to engage the surface of roll 70.
  • solenoid 100 is not energized and pile 120 is out of engagement with the surface of roll 70.
  • a bracket 124 pivotally carried on a pin 126 on tank 32 supports a wiper blade 122 for movement into and out of engagement with the surface of roll along a line above the normal level of liquid in the tank 32.
  • a solenoid 128 is adapted to be energized to move the blade 128 from the position out of engagement with the roll to the position in engagement with the roll.
  • both rolls 70 and 50 are to carry liquid up into contact with the surface of the copy material 28.
  • solenoid 128 is not energized.
  • solenoid 128 is energized to move the wiper blade 122 into the broken line position illustrated in FIG. 1 at which it engages the surface of roll 70.
  • FIG. 3 I have shown one form of electrical control circuit for my cleaning system which causes solenoids 76 and to be pulsed only during times at which the carriage 10 is not over the wetting unit 30.
  • the circuit of FIG. 3 moreover, ensures that solenoid 128 is energized only during the direction of travel of carriage 10 from right to left as viewed in F IG. 1.
  • the circuit of FIG. 3 includes respective conductors 130 and 132 connected to a suitable source of altemating current potential, such for example, as 240 volts. This voltage is half-wave rectified by a siliconcontrolled rectifier 134 connected in series with an output resistor 142 between conductors 130 and 132.
  • Resistor 136 provides a means for varying the interpulse time of the output of rectifier 134.
  • Respective normally closed limit switches LS1 and LS2 connected in series with each other, connect the two solenoids 76 and 100 in parallel with output resistor 142. It will be seen that as long as both of these switches are closed solenoids 76 and 100 will be pulsed by the half-wave rectified output from the rectifier 134. If, however, either of these two limit switches LS1 and LS2 is open, the solenoids will not be pulsed. Referring again to FIG. I, it will be seen that one of the two limit switches LS1 and LS2 is open whenever any part of the carriage 10 is over the unit 30 so that neither of the solenoids will be pulsed during the time when the wetting unit is to perform its wetting function. Moreover, when the solenoids are deenergized springs 86 and position the felts 94 and 118 out of engagement with rolls 50 and 70.
  • solenoid 128 should be energized to move blade 122 into engagement with roll 70 when the carriage travels right to left over the unit 30.
  • Normally open limit switches LS3 and LS4 connected in parallel with each other are connected in series with a normally open switch S5 and with winding 128 between conductors and 132.
  • Switch S5 is under the control of the reversing drive system (not shown) of carriage 10 so as to be closed at any time at which the carriage 10 is moving from right to left.
  • the rail 14 or some appropriate part of the carriage l closes LS3 to energize solenoid 128.
  • apparatus for applying a liquid to a length of material travelling along a path past said system, apparatus comprising a tank for holding a supply of said liquid at a predetermined level therein, an applicator roll, means mounting said roll on said tank at a location at which said roll is partially immersed in said liquid to cause said roll to carry wetting liquid from said tank to the surface of material travelling thereby, an element mounted for reciprocating movement adjacent to said roll, means for reciprocating said element and means responsive to reciprocation of said member for concomitantly scrubbing the surface of said roll while rotating said roll.
  • Apparatus as in claim 1 including means responsive to the presence of material adjacent to said wetting system for disabling said reciprocating means.
  • Apparatus as in claim 4 including means for rapidly reciprocating said pile fabric toward and away from said roll.
  • Apparatus as in claim 6 including an armature associated with said solenoid and a rod connecting said armature to said fabric.
  • a wetting system for an electrostatic copier having means for moving a length of copy material back and forth past said system including in combination, a tank for holding a supply of developer carrier liquid, a first roll, a second roll, means mounting said rolls on said tank for rotary movement with the axis thereof generally perpendicular to the direction of movement of said moving means relative to the system, said rolls being partially immersed in the liquid in said tank, respective lengths of pile material associated with said rolls, means mounting said pile material length adjacent the respective rolls for reciprocation relative thereto in directions generally perpendicular to the roll axes between positions in engagement with the roll surfaces and positions out of engagement with the roll surface, and means for driving said pile material lengths between said positions concomitantly to scrub said rolls and to impart rotary movement thereto.
  • Apparatus as in claim 8 including means responsive to the presence of said moving means over said system for disabling said driving means.
  • Apparatus as in claim 8 including a wiper blade associated with one of said rolls, means mounting said blade for movement between an operative position in engagement with said one roll and an inoperative position away from said one roll, a solenoid adapted to be energized to move said blade from its inoperative position to its operative position and means responsive to movement of said moving means in one direction rela tive to said system and to the presence of said moving means over said system for energizing said solenoid.
  • a system as in claim 1 1 including means for varying the rate at which said solenoids are pulsed.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Cleaning In Electrography (AREA)
  • Wet Developing In Electrophotography (AREA)
  • Photographic Processing Devices Using Wet Methods (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
US00187761A 1971-10-08 1971-10-08 Cleaning system for wetting tank rollers Expired - Lifetime US3749050A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US18776171A 1971-10-08 1971-10-08

Publications (1)

Publication Number Publication Date
US3749050A true US3749050A (en) 1973-07-31

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00187761A Expired - Lifetime US3749050A (en) 1971-10-08 1971-10-08 Cleaning system for wetting tank rollers

Country Status (6)

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US (1) US3749050A (OSRAM)
JP (1) JPS4847350A (OSRAM)
DE (2) DE2248460A1 (OSRAM)
FR (1) FR2155615A5 (OSRAM)
GB (1) GB1362527A (OSRAM)
IT (1) IT968733B (OSRAM)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4352552A (en) * 1980-06-25 1982-10-05 Xerox Corporation Multicolor development system for electrophotographic printing machines

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4436054A (en) * 1982-08-23 1984-03-13 Xerox Corporation Xerographic toner cleaning station
JPH065377B2 (ja) * 1986-06-27 1994-01-19 富士写真フイルム株式会社 画像形成装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2991754A (en) * 1959-02-06 1961-07-11 Rca Corp Developing apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4352552A (en) * 1980-06-25 1982-10-05 Xerox Corporation Multicolor development system for electrophotographic printing machines

Also Published As

Publication number Publication date
GB1362527A (en) 1974-08-07
DE2248460A1 (de) 1973-04-19
FR2155615A5 (OSRAM) 1973-05-18
JPS4847350A (OSRAM) 1973-07-05
DE7236309U (de) 1973-01-18
IT968733B (it) 1974-03-20

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