US3348960A - Powder application - Google Patents

Powder application Download PDF

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Publication number
US3348960A
US3348960A US528141A US52814166A US3348960A US 3348960 A US3348960 A US 3348960A US 528141 A US528141 A US 528141A US 52814166 A US52814166 A US 52814166A US 3348960 A US3348960 A US 3348960A
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US
United States
Prior art keywords
powder
path
reservoir
sheet
platform
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
US528141A
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English (en)
Inventor
Gilbert Paul
Watson Ronald
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.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
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Publication of US3348960A publication Critical patent/US3348960A/en
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/06—Powdering devices, e.g. for preventing set-off
    • B41F23/065—Powdering devices, e.g. for preventing set-off for thermography
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/06—Powdering devices, e.g. for preventing set-off
    • 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
    • G03G15/082—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer for immersion

Definitions

  • the present invention relates to the application of powder to sheets.
  • powder may be applied to a printed sheet while the ink is still wet to produce raised letters in the bronzing process or, in a copying process, powder may be applied to a sheet carrying an electrostatic or condensed oil latent image so as to adhere to and thereby develop the image.
  • the present invention provides a device for applying powder to a sheet comprising a reservoir for the powder, guide means which define a predetermined path for the sheet, a platform having an upper surface located in said path, and means for transferring a quantity of powder from said reservoir onto said platform surface.
  • a sheet can then be fed along said path and beneath (and possibly partly through), the quantity of powder on said platform surface; and with such a device the size of platform can be readily chosen to carry the correct quantity of powder for a sheet.
  • This enables the device to handle thin papers since it is not necessary for the sheet to be forced under a large pile of powder. Also the amount of powder in the reservoir has little effect on the quantity transferred to the platform, which allows the device to operate consistently for longer :periods with out replenishment.
  • the reservoir is located below said platform and the guide means is apertured or discontinuous so as to allow any surplus powder to fall back into the reservoir; and preferably said transfer means is arranged to transfer powder onto said platform surface without crossing said predetermined path.
  • the latter feature allows a sheet to be fed along said path and beneath powder on said platform surface at any time after the platform surface has been filled, without introducing synchronisation problems or the risk of damage to the original in the event of the transfer means'striking the original.
  • the transfer means comprises a paddle and a rotary driving means which is arranged to move said paddle through powder in said reservoir and thereby to transfer a portion of said powder onto said platform surface.
  • the paddle i's resiliently mounted on said driving means and located so as to allow said paddle to wipe against said platform, thereby allowing powder to pass through the aperturing or discontinuity onto the platform surface.
  • P-referably means are provided for restraining said 3,348,963 ?atented @ct. 24, rear paddle against the action of its resilient mounting to follow a predetermined path through said reservoir and for releasing said paddle when adjacent said platform to allow it to wipe against said platform.
  • the restraining means is preferably an almost circular cam track.
  • Powder can be raised from said reservoir to said platform by arranging said paddle to closely follow the internal surface of the reservoir so that powder will be held between the paddle and said internal surface.
  • FIG. 1 shows a sectioned side elevation of a device for applying powder to a sheet of paper and
  • FIG. 2 shows a perspective view of the device shown partly cut away and partly transparent for clarity.
  • the device comprises guide means 1, 2, defining a predetermined path for a sheet, a platform 3 and a reservoir 4, located beneath the platform and guide means.
  • the platform 3 has an upper surface 5 located in the predetermined path defined by guide means 1, 2.
  • a transfer means 6 is located within the reservoir 4 and comprises a paddle 7 and a resilient mounting in the form of a pair of phosphor bronze springs 8 connecting the paddle to a pair of wheels 9 driven by a shaft 10.
  • a pair of cam tracks 11 located at the ends of the reservoir constrain the paddle 7 to follow a substantially circular path closely following the internal surface of the reservoir except in the vicinity of the platform 3 where it is released to wipe against the platform 3. The spacing between the paddle and the internal surface of the reservoir will be small enough to prevent any appreciable quantity of powder falling therebetween during rotation but large enough to prevent hysical contact and consequent wear.
  • a pair of rollers 12 is provided for feeding a sheet into the device and the guide means consists of a lead-in guide 1 and a number of vertically upstanding plates 2, whose edges are shaped to define the predetermined path.
  • the guide means has a discontinuity 13 between the leadin guide 1 and the platform 3 to allow powder to be transferred onto the platform or fall back therefrom and there are spaces between the plates 2 to allow surplus powder to fall back into the reservoir 4. It will be noted that the reservoir being situated below and out of the sheet path simplifies re lenishment of the reservoir when necessary and that this can be done for example via a elosable o ening at a convenient point in the reservoir casing.
  • the feed-out path for the sheet includes a deflector plate 14 to keep a sheet in the correct path and this has a bent over end 15 to control the tail end of the sheet after it has left the nip of the rollers 12.
  • a beater 16 consisting of a square cross-section shank arranged to be driven in opposition to the direction of feed of the paper is provided to knock surplus powder off the sheet as it passes through, and a guide roller 17 and pinion shaft 18 are provided to control passage of the sheet at this stage.
  • a pair of rollers 21 is arranged to dnaw the sheet out of the device. It will be appreciated that other arran gements for the feed-out path are possible and the particular arrangement described for determining the feed path can be varied without materially affecting the operation of the device.
  • the device has a cover 19 and side walls 20 which may be part of some larger apparatus with which the device may be associated.
  • the resulting structure is thus almost fully enclosed, except for the sheet entry and exit points, so that in operation powder disturbed by the paddle 7 or beater 16 will be unlikely to pervade any associated adjacent mechanisms, for example other parts of a copying machine.
  • the cam tracks 11 and bearings for the 3 shaft 1% are located outside the side walls 20 to reduce the possibility of powder clogging.
  • the shaft 10 rotates and causes the paddle to pass through powder in the reservoir 4 and thus lift, by co-operation with the internal wall surface of the reservoir, the powder to the platform 3.
  • the paddle is released from the restraint of the cam tracks 11 so that, under the action of the springs 8, powder is partly thrown and partly wiped from the paddle on to the platform surface 5.
  • the wiping action generally predominates.
  • the shaft 10 continues to rotate so that after a few revolutions the platform surface is completely filled with powder and powder starts to fall off the back of the platform between the plates 2 and back into the reservoir 4, thereby maintaining a constant amount of powder on the platform.
  • a sheet of paper bearing an image on its upper side to which powder will adhere can then be fed into the device via the rollers 12 and will be directed under the dosed pile of powder on the platform surface 5.
  • the sheet will pick up a quantity of powder and as it progresses upwards through the device the powder will fall down the surface of the sheet and eventually back into the reservoir. Powder will adhere to the image on the sheet and the beater will knock any surplus powder off the non-image areas.
  • the leadin guide 1 and an adjacent portion of the casing of the reservoir 4 were flexible, by being of a suitable plastics material, so enabling the lead-in guide to be capable of being forced towards the platform 3 to close the discontinuity 13.
  • a solenoid actuated by a microswitch in the copy sheet path caused the discontinuity 13 to be closed when a copy sheet passed through, thereby reducing the likelihood of the paddle 7 forcing powder against the back of the copy sheet, and the discontinuity 13 to be open at other times to allow charging of the platform surface 5.
  • shaft rotated at 25 rpm. thereby providing a dosed quantity, 1.5 grm. of powder on the platform in 2 to 3 revolutions of shaft 10.
  • Foolscap size sheets were driven through the machine at 15 ft/min. and the beater 16 rotated at 1440 rpm. in opposition to the direction of feed of paper through the machine.
  • apparatus adapted to supply powder to separate sheets and comprised of guide means definitive of a predetermined feed path for said sheets and disposed on the underside of said path to support sheets fed therethrough, said apparatus having an upward-facing surface on the underside of said path and adapted to hold powder in the way of movement of a sheet in said path, and said sheets being relatively moved in time succession in said path and over said surface to pick up powder on the upper side of each sheet, the improvement comprising, a platform providing such surface, a powder reservoir below said platform and having a substantially greater storage capacity for powder than said surface, means to transfer powder from said reservoir to said surface, said transfer means being a repetitive supplier of new accumulations of powder on said surface so as to form a succession of fresh piles of powder of which each is presented to a respective one of said sheets moving successively in said path and means rendering said guide means apertured so as to allow surplus powder to fall back into said reservoir.
  • the transfer means comprises a transfer member and rotary driving means which is arranged to move said transfer member through powder in said reservoir and thereby to transfer a portion of said powder onto said surface.
  • apparatus adapted to apply powder to separate sheets and comprised of guide means definitive of a predetermined path for said sheets and disposed on the underside of said path to support sheets fed therethrough, said apparatus having an upward-facing surface which is disposed along said path on the underside thereof between lead-in and feed-out portions of said guide means, and which is adapted to hold powder in the way of movement of a sheet in said path, and said sheets being relatively moved in time succession in said path and over said surface to pick up powder on the upper side of each sheet, and said feed-out portion of said guide means being shaped to give the corresponding portion of said path an upward slant greater than the slippage angle of powder on said sheets so as to cause powder to spill down over said sheets, the improvement comprising a powder reservoir disposed below said surface, aperture means formed in said feed-out portion of said guide means and serving as a drain into said reservoir for said spilled down powder and for surplus powder deposited on said surface, means providing a discontinuity between said surface and said lead-in portion of said guide means, and means to transfer powder

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Pile Receivers (AREA)
  • Coating Apparatus (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
US528141A 1965-02-17 1966-02-17 Powder application Expired - Lifetime US3348960A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB6920/65A GB1125371A (en) 1965-02-17 1965-02-17 Improvements in or relating to the application of powder to sheets
GB4919165 1965-11-19

Publications (1)

Publication Number Publication Date
US3348960A true US3348960A (en) 1967-10-24

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Family Applications (2)

Application Number Title Priority Date Filing Date
US528141A Expired - Lifetime US3348960A (en) 1965-02-17 1966-02-17 Powder application
US528034A Expired - Lifetime US3348527A (en) 1965-02-17 1966-02-17 Powder application

Family Applications After (1)

Application Number Title Priority Date Filing Date
US528034A Expired - Lifetime US3348527A (en) 1965-02-17 1966-02-17 Powder application

Country Status (5)

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US (2) US3348960A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
BE (1) BE676527A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE1297628B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1125371A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NL (1) NL6602027A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1932727A (en) * 1929-05-31 1933-10-31 James W Faulkner Coating machine
FR1036391A (fr) * 1951-05-02 1953-09-07 Ramasseuse de fruits et légumes
US2902974A (en) * 1956-06-14 1959-09-08 Ibm Latent electrostatic image developing apparatus
US2924519A (en) * 1957-12-27 1960-02-09 Ibm Machine and method for reproducing images with photoconductive ink
US3021817A (en) * 1956-08-29 1962-02-20 Zindler Lumoprint Kg Copying of documents
US3105770A (en) * 1960-04-15 1963-10-01 Xerox Corp Cascade development improvement
US3130074A (en) * 1960-03-22 1964-04-21 Gordon Company Inc Dusting apparatus
US3263234A (en) * 1961-10-04 1966-07-26 Burroughs Corp Apparatus and method of electrostatic recording
US3284224A (en) * 1963-01-04 1966-11-08 Xerox Corp Controlled xerographic development

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR387808A (fr) * 1908-02-26 1908-07-23 Rene Jean Martini Fils Machine à bronzer, à talquer, à poudrer et à épousseter les impressions

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1932727A (en) * 1929-05-31 1933-10-31 James W Faulkner Coating machine
FR1036391A (fr) * 1951-05-02 1953-09-07 Ramasseuse de fruits et légumes
US2902974A (en) * 1956-06-14 1959-09-08 Ibm Latent electrostatic image developing apparatus
US3021817A (en) * 1956-08-29 1962-02-20 Zindler Lumoprint Kg Copying of documents
US2924519A (en) * 1957-12-27 1960-02-09 Ibm Machine and method for reproducing images with photoconductive ink
US3130074A (en) * 1960-03-22 1964-04-21 Gordon Company Inc Dusting apparatus
US3105770A (en) * 1960-04-15 1963-10-01 Xerox Corp Cascade development improvement
US3263234A (en) * 1961-10-04 1966-07-26 Burroughs Corp Apparatus and method of electrostatic recording
US3284224A (en) * 1963-01-04 1966-11-08 Xerox Corp Controlled xerographic development

Also Published As

Publication number Publication date
US3348527A (en) 1967-10-24
DE1297628B (de) 1969-06-19
NL6602027A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1966-08-18
BE676527A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1966-08-16
GB1125371A (en) 1968-08-28

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