US2961993A - Device for developing and fixing xerographic images - Google Patents

Device for developing and fixing xerographic images Download PDF

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Publication number
US2961993A
US2961993A US652400A US65240057A US2961993A US 2961993 A US2961993 A US 2961993A US 652400 A US652400 A US 652400A US 65240057 A US65240057 A US 65240057A US 2961993 A US2961993 A US 2961993A
Authority
US
United States
Prior art keywords
powder
box
frame
xerographic
developing
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
US652400A
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English (en)
Inventor
Limberger Walter
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.)
Lumoprint Zindler KG and Co GmbH
Original Assignee
Lumoprint Zindler KG and Co GmbH
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 Lumoprint Zindler KG and Co GmbH filed Critical Lumoprint Zindler KG and Co GmbH
Priority to US841917A priority Critical patent/US3021818A/en
Application granted granted Critical
Publication of US2961993A publication Critical patent/US2961993A/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
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/26—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the charge pattern is obtained by projection of the entire image, i.e. whole-frame projection
    • 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
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • 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
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/0801—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer for cascading

Definitions

  • the xerographic layer Before the preparation of a copy, the xerographic layer must be formed in an electrode arrangement. The xerographic layer is illuminated and covered with a powder containing pigment particles which adhere to the configuration of the latent electrostatic image of the master in the Xerographic layer. To produce the copy, the pigment particles are fused into the Xerographic layer.
  • the invention has the object of providing a readily operable device which makes possible the preparation of copies with xerographc layers without material powder wastage and provides that in operation the special requirements of the particular images are taken into account.
  • a base plate is provided with a tensioning device in order to stretch the layer support on the base plate; and the area occupied by the layer support on the base plate is covered at a certain height above the layer support; at the same time devices are provided in order to guide the coating powder to the space between the layer support and the cover without removing the cover.
  • the tensioning device is constructed as a frame and has a dish-like lower part to which a handle is secured. Over the dish-like lower part is located a tensioning rim for the layer support, which has a certain height and serves as a collecting rim for the powder grains on distributing the pigment particles on the latent electrostatic image.
  • the tensioning device is constructed in the form of a box with a closure device over the tensioning rim, so that the manufacture of copies is possible with ordinary illumination.
  • this closure device is constructed as a slide and is made transparent.
  • a preferably removable supply device for the powder which is so arranged or constructed that no illumination of the electrostatic layer disposed in the box can occur through this opening. This opening serves at the same time for removal of the powder before fusing of the pigment particles.
  • the base plate carrying the layer support serves as the electrode in connection with a forming device and if required as part of a heating device arranged in the tendevice.
  • the base plate is electrically connectable to the forming device and may be constructed of copper, or as a foil.
  • a supply container for the toner communicating through one or more openings with the inside of box-like tensioning device is arranged directly on the box-like tensioning device.
  • the manufacture of copies with xerographic layers is considerably facilitated, since the layer support need only be stretched in the tensioning device, which is subsequently moved into different cooperating processing devices provided with slots.
  • the forming device which consists of an electrode arrangement. It is so constructed that over the tensioning device a number of electrodes having small radii of curvature (eg. waves) are arranged, whereas the counter-electrode is disposed under the tensioning device. The potential of this counter-electrode is supplied, on inserting the tensioning device into the slot of the forming device.
  • the lower electrode is located at ground potential so that the charged plate is arranged within the tensioning device.
  • An illuminating device which is likewise provided with a slot into which the box-like tensioning device according to the invention is inserted, in order to expose the xerographic layer.
  • devices are provided which cooperate with special means provided on the closure device to ensure, for example, that the closure device of the tensioning device is opening on insertion into the forming and illuminating apparatus, and closed upon removing the tensioning device.
  • the forming and illuminating apparatus can be used with a plurality of tensioning devices according to the invention, since they are in use only for a short time for preparing a copy.
  • the tensioning devices themselves serve for distributing the coating powder of the latent electrostatic image and in one embodiment also as a fusing device. By this, it is ensured that a particularly fine distribution of the coating powder on the electrostatic image will result, and that no movement of the electrostatic layer is required before fusing of the pigment particles.
  • Fig. l shows a section through a tensioning device of box-like form according to the invention
  • Fig. 2 shows a plan view of this device
  • Fig. 3 shows a diagrammatic ⁇ front view of the whole arrangement on a considerably reduced scale
  • Fig. 4 shows a front view of the device according to the invention.
  • Figs. l, 2 and 4 can be Seen the construction of the device serving as the hand apparatus.
  • the plate 2 At the edges of a lower dish-like part 1, the plate 2 of a heat-conducting electrical conductor is arranged.
  • the plate 2 preferably consists of copper. In order to give it only a small heat capacity, it is constructed in a preferred em bodiment as a foil which is firmly stretched on the rim of the dish 1.
  • the heating coil 3 is arranged, which runs over the whole surface of the device.
  • the current supply for the heating coil 3 is provided by an insulator connection 4 at the side on which the handle 5 with the electric supply is arranged.
  • a frame 6 Under the dish 1 is located a frame 6 with the same dimension as the edge parts of the dish 1.
  • the frame 6 is pivotally mounted upon the dish-like lower part 1 by a hinge 7 so that it can be tilted upwards.
  • a closure device '8 At the side which faces that having the hinge, a closure device '8 is arranged which is preferably constructed as a catch and engages in a cavity in the edge part of the frame 6.
  • the closure device 8 is preferably located on the side of the device on which the handle is arranged so'that operation is possible with the thumb of the hand holding the handle 5.
  • This dish-like lower part 1 and, if required, the frame part 6 consist of a heat-resistant material which at the same time has little weight.
  • these parts are preferably manufactured of an asbestos product.
  • the edge parts of the frame 6 have on the lower edge facing the plate 2 anundercut 9 which is so dimensioned closure device, in the form of a slide member 10, transg I parent to red light.
  • This slide member slides for example in guides 11 provided on the side of the frame 6.
  • a filling funnel 12 for the powder is provided which leads to a channel 13 which is so curved that no direct illumination can occur through this inlet opening.
  • the channel 13 can have a helical shape.
  • the funnel is so arranged on the slide 10 that the channel opens into one corner of the frame 6. This arrangement enables the removal of excess powder without opening the device by shaking the excess powder into this corner and then inverting it and allowing it to run out from the channel 13 and the funnel 12.
  • the projection 15 containing the funnel 12 is releasably constructed in a particular embodiment, wherein at the same time the outlet opening in the slide 10 is arranged for receiving a closure catch.
  • the projection 15 also has a spherical depression 16, 17 on each end face, which facilitate use of the projection 15 as a handle for moving the closure device 10.
  • an abutment 18 is provided which co-operates with a corresponding abutment for example on the forming device or illuminating device and which automatically opens the frame 6 on sliding the device into this apparatus.
  • a restoring spring can be arranged between the slide 10 and another part of the device, for example the handle 5, so that the device automatically closes on removal of the forming or illuminating device. If such a power store is not provided, it is sulicient for removal of the device to exert a pressure on the projection 15, particularly the cavity 14, in order to return this slide to the position shown in Fig. 1.
  • a current supply lead 19 is connected to the handle 5 of the device.
  • the current lead 19 has a three-prong plug 20 over one of which the necessary current for the heating coil 3 and the others the potential of the electrodes located in the forming device below the apparatus are led to the plate 2. In the preferred construction, this serves as a measuring device which is connected to ground.
  • Switch devices for controlling the current supply are located on the handle 5.
  • the press button switch 21 is provided by means of which a short heat pulse can be produced. Because of the low heat capacity of the plate 2, it is suicient to switch on for only a few seconds in order to heat the xerographic layer to about 120 C.
  • the switch 21 is constructed as a time switch which automatically switches oi after a predetermined time nterval. This time interval can be made dependent upon the layer support used and the image characteristics in the manufacture of several copies from one master.
  • bottom plate forming side walls and a cover plate spacedly held on said frame above said bottom plate
  • said frame being provided with internal fastening means for removably mounting said carrier sheet on said bottom plate in said box, said box preventing light rays capable of objectionably affecting said xerographic layer from reaching said sheet
  • said frame and said coverplate being movable away from said bottom plate for opening said box to enable insertion of said carriersheet, shielded inlet means on said box above said bottom plate enabling the introduction Yof developing powder into the space above said bottom plate while barring the entrance of said light rays, and heating means below said bottom plate for fusing said powder onto said xerographic layer.
  • a device wherein said frame is 0hingedly secured to said bottom plate and adapted to be tilted upwardly thereon, said fastening means including a recessed formation on the underside of said frame.
  • said cover plate consists of a material transmissive to red light rays only.
  • a device according to claim 1, further comprising a handle on said box for moving the latter in a manner distributing said powder over said xerographic layer.
  • said inlet means comprises a funnel-shaped extension projecting outwardly from said box, said extension being provided with a tortuous channel.
  • a device wherein said cover plate is slidable on said frame, said extension being provided on said cover plate and forming aknob thereon facilitating its displacement.
  • a device for developing and fixing a latent image on a xerographic layer of a carrier sheet comprising a substantially closed box, said box including a bottom plate of good thermal conductivity, a frame above said bottom plate forming side walls and a cover plate spacedly held on said frame above said bottom plate, said frame being provided with internal fastening means for removably mounting said carrier sheet on said bottom plate in said box, said cover plate being removably mounted on said frame for opening said box to enable insertion of said carrier sheet, said cover plate consisting of a material transmissive to red light rays only, said box preventing other light rays from reaching said xerographic layer, shielded inlet means on said box above said bottom plate enabling the introduction of developing powder into the space above said bottom plate while i barring the entrance of said other light rays, heating 1.
  • a device wherein said cover plate is slidably held in said frame, further comprising abutment means on said cover plate for displacing the latter from its operative position upon contact with an external stop.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Wet Developing In Electrophotography (AREA)
  • Electrophotography Configuration And Component (AREA)
  • Electrophotography Using Other Than Carlson'S Method (AREA)
US652400A 1956-04-16 1957-04-12 Device for developing and fixing xerographic images Expired - Lifetime US2961993A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US841917A US3021818A (en) 1957-04-12 1959-09-01 Device for developing and fixing xerographic images

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEL24613A DE1058369B (de) 1956-04-16 1956-04-16 Kassettenartiges Belichtungs- und Entwicklungsgeraet zum Herstellen von Kopien auf fotoleitenden Schichten
DE1065725T 1956-10-11

Publications (1)

Publication Number Publication Date
US2961993A true US2961993A (en) 1960-11-29

Family

ID=29251674

Family Applications (1)

Application Number Title Priority Date Filing Date
US652400A Expired - Lifetime US2961993A (en) 1956-04-16 1957-04-12 Device for developing and fixing xerographic images

Country Status (5)

Country Link
US (1) US2961993A (enrdf_load_stackoverflow)
CH (1) CH356147A (enrdf_load_stackoverflow)
DE (2) DE1058369B (enrdf_load_stackoverflow)
FR (1) FR1174225A (enrdf_load_stackoverflow)
GB (1) GB824993A (enrdf_load_stackoverflow)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2550724A (en) * 1949-04-13 1951-05-01 Haloid Co Apparatus for applying powder to an electrophotographic plate
US2586484A (en) * 1950-04-29 1952-02-19 Haloid Co Fusing device
US2600580A (en) * 1949-06-03 1952-06-17 Haloid Co Electrophotographic apparatus
US2689179A (en) * 1951-03-02 1954-09-14 Haloid Co Xerographic contact copying device
US2750922A (en) * 1951-12-13 1956-06-19 Haloid Co Apparatus for developing electrophotographic plates
US2791949A (en) * 1956-02-01 1957-05-14 Haloid Co Xerographic copying device
US2826168A (en) * 1956-04-16 1958-03-11 Grant Photo Products Inc Means for making electrostatic prints
US2831409A (en) * 1955-07-18 1958-04-22 Haloid Co Xerographic camera
US2894486A (en) * 1955-02-18 1959-07-14 Haloid Xerox Inc Apparatus for xerographic development
US2910351A (en) * 1955-01-03 1959-10-27 Gen Electric Method of making printed circuit

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2588675A (en) * 1948-12-07 1952-03-11 Haloid Co Electrocopy apparatus

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2550724A (en) * 1949-04-13 1951-05-01 Haloid Co Apparatus for applying powder to an electrophotographic plate
US2600580A (en) * 1949-06-03 1952-06-17 Haloid Co Electrophotographic apparatus
US2586484A (en) * 1950-04-29 1952-02-19 Haloid Co Fusing device
US2689179A (en) * 1951-03-02 1954-09-14 Haloid Co Xerographic contact copying device
US2750922A (en) * 1951-12-13 1956-06-19 Haloid Co Apparatus for developing electrophotographic plates
US2910351A (en) * 1955-01-03 1959-10-27 Gen Electric Method of making printed circuit
US2894486A (en) * 1955-02-18 1959-07-14 Haloid Xerox Inc Apparatus for xerographic development
US2831409A (en) * 1955-07-18 1958-04-22 Haloid Co Xerographic camera
US2791949A (en) * 1956-02-01 1957-05-14 Haloid Co Xerographic copying device
US2826168A (en) * 1956-04-16 1958-03-11 Grant Photo Products Inc Means for making electrostatic prints

Also Published As

Publication number Publication date
CH356147A (de) 1961-08-15
FR1174225A (fr) 1959-03-09
DE1065725B (enrdf_load_stackoverflow)
DE1058369B (de) 1959-05-27
GB824993A (en) 1959-12-09

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