US3357401A - Xerographic fuser monitoring apparatus - Google Patents

Xerographic fuser monitoring apparatus Download PDF

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Publication number
US3357401A
US3357401A US585972A US58597266A US3357401A US 3357401 A US3357401 A US 3357401A US 585972 A US585972 A US 585972A US 58597266 A US58597266 A US 58597266A US 3357401 A US3357401 A US 3357401A
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US
United States
Prior art keywords
support material
xerographic
fixing apparatus
path
movement
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
US585972A
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English (en)
Inventor
Larry M Wood
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.)
Xerox Corp
Original Assignee
Xerox Corp
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
Application filed by Xerox Corp filed Critical Xerox Corp
Priority to US585972A priority Critical patent/US3357401A/en
Priority to NL6713691A priority patent/NL6713691A/xx
Application granted granted Critical
Publication of US3357401A publication Critical patent/US3357401A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
    • G03G15/2007—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using radiant heat, e.g. infrared lamps, microwave heaters

Definitions

  • this invention relates to a monitoring apparatus for detecting the presence of support material in an apparatus for fixing resinous toner powder images and to control the operation of the fixing apparatus in accordance with the presence or non-presence of the support material.
  • a plate comprising a layer of photoconductive material on a conductive backing is given a uniform electric charge over its surface and then exposed to the subject matter to be reproduced by various projection techniques. This exposure discharges the plate in accordance with the light intensity reaching it thereby creating an electrostatic latent image on or in the plate.
  • Developers which comprise, in general, a mixture of suitable resin based powder, hereinafter referred to as toner, and a carrier material which functions to carry and to generate triboelectric charges on the toner. More specifically, the function of the carrier material is to provide mechanical control of the toner, or to carry the toner to an image surface, and simultaneously provide almost complete homogenity of charge polarity.
  • toner powder is brought into surface contact with the photoconductive layer and is held thereon electrostatically in a pattern corresponding to the electrostatic latent image. Thereafter, the developed xerographic image may be transferred to a support material to which it may be fixed by any suitable means.
  • a sheet of support material passing through the fixing apparatus be closely monitored to detect the clogging of support material inside the fixing apparatus and to control the operation of the fixing apparatus in the event that a sheet of support material would become jammed therein.
  • a sheet of support material is electrostatically secured to a transport mechanism for further processing and due, to the minute electrostatic forces securing the support material to the transport mechanism and the intensity of a source of radiant energy utilized with the apparatus, a major problem existed in monitoring sheet material passing through the fixing apparatus.
  • a mechanically actuated switch could not be positioned in the path of paper movement to be actuated by contacting the support material.
  • the electrostatic forces securing the support material to the transport mechanism are of such a minute magnitude as to be insutficient to enable the support material to operate a mechanically actuable switch.
  • the paper would be stripped from the electrostatic transport mechanism and become jammed within the fixing apparatus.
  • a photosensor could not be utilized as a monitoring apparatus even though the problems associated with physical contact of the support material would be eliminated. The magnitude of light intensity from the source of radiant energy would actuate the photosensor at all times regardless of the presence or non-presence of the support material.
  • the present invention comprises a monitoring apparatus for detecting the presence of support material in an apparatus for fixing resinous toner powder images and actuable to control the fixing apparatus.
  • This invention is unetfected by radiant energy and functions independent of physical contact with the sheet of support material.
  • Another object of this invention is to improve monitoring apparatus for use with a xerographic fixing mechanism by eliminating physical contact of the monitoring apparatus with the support material passing through the fixing mechanism.
  • a further object of this invention is to improve monitoring devices for use with a xerographic fixing apparatus by controlling the operation of the monitoring device ingependently of radiant energy associated with the fixing evice.
  • Still another object of this invention is to improvexerographic fixing apparatus by the controlling thereof in accordance with a monitoring device uneffected by the operation of the fixing apparatus.
  • FIG. 1 is a front elevation view of an automatic xerograph ic reproducing machine utilizing the invention therein;
  • FIG. 2 is an enlarged sectional view of the fixing apparatus of the automatic xerographic reproducing machine shown in FIG. 1 to better illustrate the monitoring apparatus;
  • FIG. 3 is an enlarged horizontal elevation view of the fixing apparatus of FIG. 2 to illustrate the positioning of the monitoring apparatus;
  • FIG. 4 is an enlarged view of a monitoring switch to better illustrate the parts thereof.
  • FIG. 5 is an electrical schematic to illustrate the control circuit of the monitoring apparatus.
  • FIG. 1 an automatic xerographic reproducing machine having an apparatus for fixing xerographic toner powder images on support material constructed in accordance with the heretofore mentioned copending application Serial No.
  • Unfused sheet support material bearing a xerographic toner powder image is electrostatically secured to the heated roller 40 to be .directly heated at a constant controllable rate by means of the heat conducted from the roller 40 to the sheet material.
  • the toner powder image bearing support material is brought into thermal contact with a source of intense radiant energy whereat the xerographic toner powder image is selectively fixed to the support material; that is, the desired toner powder image is permanently fixed to the support material and the unwanted images are not fixed.
  • the support material is removed from the roll by means of a pick-off arm 25 pivotally mounted adjacent to the roller 40 on bracket 27 and engaging a slot provided in the roller.
  • Pivot arm 25 is tapered to a point and positioned so that the point rides below the surface of the roller 40 enabling it to engage the underside of the support material thereby stripping the sheet from the roller.
  • guide 26 As the support material is stirpped from the roller 40, it engages guide 26 for forwarding to the vacuum sheet transport 60 to be further processed and transported out of the xerographic reproducing machine.
  • limit switch LS-Z -of the of bracket 27 positioned between the heated roller 40 and the vacuum transport 60 and supported on the machine frame.
  • the limit switch LS2 which may be of any suitable type such as switch E-51 available from Cherry Electric, Highland Park, Illinois, has an actuator arm 23 having a receptor or collector plate 22 secured to one end thereof.
  • the collector 22 is positioned adjacent the path of sheet travel between the heated roller 40 and vacuum transport 60 in cooperative relationship with a source of aeriform fluid emitted through a suitable conduit 20 having an orifice 21 positioned to direct the flow of aeriform fluid onto the collector 22, the aeriform fluid being supplied by means of a compressornot shown.
  • limit switch LS-3 is a timing switch of the automatic xerographic reproducing machine which is actuable in timed sequence to the forwarding of a sheet of support material into contact with the image of the xerographic drum.
  • the timing switch is periodically actuated as the sheets of support material are forwarded to the xerographic drum.
  • the support material ' is forwarded by means of the vacuum transport 3i into contact with the heated roller 40 contacting the actuator arm of normally
  • the paper is forwarded from the 'heated roller 40 onto the vacuum transport 60 to be discharged from the automatic xerographic reproducing machine, and, therefore, the air stream emitted through the orifice 21 against the collector 22 of limit switch LS-2 will be interrupted due to the support material passing between the orifice and the collector, thereby opening the normally closed contacts of limit switch LS-2.
  • the switch LS-3 Since the limit switch LS-3 is actuated in timed sequence to the forwarding of sheet support material, the switch is closed once for each sheet passing through the xerographic reproducing machine and this closing occurs at the point in time when a sheet of support material should be passing between the orifice 21 and the collector plate 22, thereby interrupting the impingement of aeriform fluid on the collector plate and allowing switch LS-Z to open.
  • a monitoring apparatus for sensing the presence of support material in a xerographic fixing apparatus including means for transporting a sheet of support material in a path of movement through a xerographic fixing apparatus,
  • switch means positioned in said path of movement at the entrance of said xerographic fixing apparatus adapted to be actuated by a sheet of support material
  • a source of aeriform fluid positioned adjacent said path of movement at the egress of said xerographic fixing apparatus to direct said aeriform fluid through said path of movement
  • switch means positioned at the egress of said xerographic fixing apparatus adjacent said path of movement in cooperative relation with said source of aeriform fluid to be actuated by said aeroform fluid passing through said path of movement
  • said switch means ositioned at the egress of said xerographic fixing ap paratus adjacent said path of movement includes a limit switch having a aeriform fluid receptor plate secured to an actuator arm of said swith.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fixing For Electrophotography (AREA)
US585972A 1966-10-11 1966-10-11 Xerographic fuser monitoring apparatus Expired - Lifetime US3357401A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US585972A US3357401A (en) 1966-10-11 1966-10-11 Xerographic fuser monitoring apparatus
NL6713691A NL6713691A (xx) 1966-10-11 1967-10-09

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US585972A US3357401A (en) 1966-10-11 1966-10-11 Xerographic fuser monitoring apparatus

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US3357401A true US3357401A (en) 1967-12-12

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NL (1) NL6713691A (xx)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2162898A5 (xx) * 1971-11-08 1973-07-20 Canon Kk
JPS4888929U (xx) * 1972-01-31 1973-10-26
US3804516A (en) * 1972-12-11 1974-04-16 Xerox Corp Fire detecting device for a photographic printing machine
US3844252A (en) * 1973-05-21 1974-10-29 Xerox Corp Sheet removal device
US3845742A (en) * 1973-05-17 1974-11-05 Xerox Corp Fuser roll construction
US3926519A (en) * 1974-06-03 1975-12-16 Xerox Corp Control device for an electrophotographic printing machine
US3975146A (en) * 1971-12-20 1976-08-17 Hoechst Aktiengesellschaft Fixing thermoplastic material on a carrier
US3979161A (en) * 1975-03-18 1976-09-07 Sperry Rand Corporation Copying machine fire snuffer
US4341945A (en) * 1979-12-31 1982-07-27 Pitney Bowes Inc. Fire extinguishing device for electrophotocopier

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2701765A (en) * 1951-06-18 1955-02-08 Haloid Co Xerographic fusing apparatus
US3053962A (en) * 1960-08-01 1962-09-11 Xerox Corp Xerographic fusing apparatus
US3128379A (en) * 1960-11-14 1964-04-07 Minnesota Mining & Mfg Thermocopying machine with temperature and speed correlating means
US3164717A (en) * 1962-10-23 1965-01-05 Bohn Business Machines Inc Heating control device
US3197614A (en) * 1961-08-31 1965-07-27 Dick Co Ab Fuser unit for electronic printing machine
US3219799A (en) * 1963-02-07 1965-11-23 Xerox Corp Xerographic fusing apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2701765A (en) * 1951-06-18 1955-02-08 Haloid Co Xerographic fusing apparatus
US3053962A (en) * 1960-08-01 1962-09-11 Xerox Corp Xerographic fusing apparatus
US3128379A (en) * 1960-11-14 1964-04-07 Minnesota Mining & Mfg Thermocopying machine with temperature and speed correlating means
US3197614A (en) * 1961-08-31 1965-07-27 Dick Co Ab Fuser unit for electronic printing machine
US3164717A (en) * 1962-10-23 1965-01-05 Bohn Business Machines Inc Heating control device
US3219799A (en) * 1963-02-07 1965-11-23 Xerox Corp Xerographic fusing apparatus

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2162898A5 (xx) * 1971-11-08 1973-07-20 Canon Kk
US3975146A (en) * 1971-12-20 1976-08-17 Hoechst Aktiengesellschaft Fixing thermoplastic material on a carrier
JPS4888929U (xx) * 1972-01-31 1973-10-26
US3804516A (en) * 1972-12-11 1974-04-16 Xerox Corp Fire detecting device for a photographic printing machine
US3845742A (en) * 1973-05-17 1974-11-05 Xerox Corp Fuser roll construction
US3844252A (en) * 1973-05-21 1974-10-29 Xerox Corp Sheet removal device
US3926519A (en) * 1974-06-03 1975-12-16 Xerox Corp Control device for an electrophotographic printing machine
US3979161A (en) * 1975-03-18 1976-09-07 Sperry Rand Corporation Copying machine fire snuffer
US4341945A (en) * 1979-12-31 1982-07-27 Pitney Bowes Inc. Fire extinguishing device for electrophotocopier

Also Published As

Publication number Publication date
NL6713691A (xx) 1968-04-16

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