US3798414A - Heating arrangement for dry copying machines - Google Patents

Heating arrangement for dry copying machines Download PDF

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Publication number
US3798414A
US3798414A US00384537A US3798414DA US3798414A US 3798414 A US3798414 A US 3798414A US 00384537 A US00384537 A US 00384537A US 3798414D A US3798414D A US 3798414DA US 3798414 A US3798414 A US 3798414A
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US
United States
Prior art keywords
cowl
thermal expansion
switch
bar
rib
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
US00384537A
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English (en)
Inventor
Martino Di Muriaglio C San
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.)
CRT ITALIA
CRT ITALIA SRL IT
Original Assignee
CRT ITALIA
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 CRT ITALIA filed Critical CRT ITALIA
Application granted granted Critical
Publication of US3798414A publication Critical patent/US3798414A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00535—Stable handling of copy medium
    • G03G2215/00666—Heating or drying device

Definitions

  • the cowl heater is in an external longitudinal rib on the cowl and the switch is operated by a longitudinally extending reaction rod of low expansion coefficient attached at one end to the cowl, the switch itself being carried at one end of a longitudinal bar of high expansion coefficient attached at its opposite end by one or more strips of low expansion coefficient to the end of the cowl adjacentthe reaction rod.
  • the thermal expansion of the bar and strips compensatesfor that of the rod during the warm-up period of the machine, allowing the latter to reach its operating temperature rapidly.
  • the present invention relates to heating arrangements for dry copying machines of the type in which sheet material is caused to pass through a gap between a rotating cylinder and a substantially semicylindrical heating cowl of material having a high coefficient of thermal expansion, the said cowl being provided with electrical heating means controlled by a switch having a movable operating element which is actuated by thermal expansion of the cowl and which is connected at one end to a reaction rod of a material having low coefficient of thermal expansion extending parallel to the longitudinal axis of the cowl and fixed at the other end to the cowl.
  • Such a heating arrangement is referred to herein as a heating arrangement of the type described.
  • An object of the present invention is to provide an improved heating arrangement for a dry copying machine of the abovementioned type for the purpose of enabling the heating cow] to attain its operating temperature rapidly during varying conditions of operation of the machine, such temperature being defined within very restricted limits of tolerance.
  • the cowl is provided in the central part of its external surface with a longitudinally extending rib containing the electrical heating means and with two longitudinal flanges extending along the lateral sides of the rib and defining together with the outer surface of the rib a longitudinal channel;
  • the reaction rod is connected at one end to a support carried by the two longitudinal flanges of the cowl at one end thereof and acts, at its opposite end, on a lever which co-operates with the movable operating element of the switch, the said lever being pivotally mounted between the longitudinal flanges at the end of the latter opposite that to which the reaction rod is connected;
  • at least one strip of material having a lower coefficient of thermal expansion than that of thecowl is attached to and extends longitudinally beyond the flanges adjacent the end of the cowl to which the reaction rod is'fixed, the or each strip supporting one end of a bar having high coefficient of thermal expansion extending within the said channel and supporting, at its opposite end, the said switch.
  • FIG. '1 is a plan view of a heating arrangement for dry copying machines according to one embodiment of the present invention.
  • FIG. 2 is a section taken on line II II of FIG. 1;
  • FIG. 3 is a side elevation partly in section of the arrangement shown in FIG. 1, and
  • fig. 4 is a perspective view of part of the arrangement illustrated in FIGS. 1- to 3, sectioned on the line IV IV of FIG. 3.
  • reference 1 indicates a semi-cylindrical heating cowl of a dry copying machine.
  • the cowl l is utilised to heat material in sheet form which is caused to pass through the gap between the internal surface of the cowl and the surface of a rotating cylinder.
  • the cowl 1 is constructed of material having a high coefficient of thermal expansion, such as, for example, aluminium, and is provided in the central part of its external surface with a longitudinally-extending rib 2 incorporating electrical heating means constituted by two resistances 3, 4 extending longitudinally inside an elongate block 5 of insulating material within the rib 2.
  • Two longitudinal flanges 6, 7 extend along the two sides of the central rib 2, parallel to the central plane of symmetry of the cowl 1.
  • the two flanges 6, 7 and the upper surface of the rib 2 (as seen in FIG. 4) define a channel which extends longitudinally over the entire length of the cowl l.
  • a rod 8 consisting of material of low coefficient of thermal expansion such as, for example, invar, extends longitudinally above the channel between the flanges 6, 7.
  • the rod 8 is provided with a threaded end 8a screwed into the central part of a U-shaped stirrup 9 located between the flanges 6, 7 at one end of the cowl l and secured to the flanges, for example by rivets.
  • the opposite end of the rod 8 has an enlarged head 8b which bears against a transverse wall of a lever 10 of U-section articulated to a transverse pivot pin 11 supported between the two flanges 6, 7.
  • the lever 10 carries a feeler 12 adapted to co-operate with the operating element of a switch 13 connected in the electrical supply circuit of the heating resistances 3, 4.
  • the switch 13 is fixed to a support block 14 having an axially extending aperture 15 therein through which the rod 8 passes.
  • the support block 14 has a lower appendage 14a of U-section into which fits one end of a square-section bar 17, the bar 17 being fixed to the appendage 14a by means of a screw 16.
  • the bar 17 is of a material having high coefficient of thermal expansion such as, for example, aluminium, and extends longitudinally in the channel comprised between the flanges 6 and 7, the bar 17 projecting a certain distance beyond the opposite end of the cowl 1 from the support block 14.
  • the outer projecting end of the bar 17 is connected by means of a transverse bolt 18 to two strips 19 and 20 of iron or other material of lower coefi'icient of thermal expansion.
  • the strips 19, 20 extend, as shown inFIGS. 1 and 3, over acerta'in distance along the lateral surfaces of the flanges 6, 7 and these respective flanges are fixed by means of screws 21.
  • the bar 17 therefore overhangs from the outer ends of the two strips 19, 20, the portion of the bar 17 extending longitudinally in the channel between the flanges 6, 7 and rib 2 being spaced from the inner surface of said channel.
  • a heating arrangement for a dry copying machine of the type comprising a rotary cylinder, a substantially semicylindrical heating cowl of material having a high coefficient of thermal expansion spaced from the surface of the cylinder by a gap through which sheet material is passed in use of the machine, electrical heating means carried by said cowl, a switch controlling the heating means, said switch having a movable operating element which is actuated by thermal expansion of the cow] and a reaction rod connected at one end to said operating element, said reaction rod being of a material having a low coefficient of thermal expansion and extending parallel to the longitudinal axis of the cowl, and said reaction rod being fixed at its other end to said cowl, the improvement which consists a. a longitudinally extending rib on the centre part of the external surface of the cowl, said rib containing the electrical heating means;
  • f. means pivotally mounting between the longitudinal flanges at the end of the latter opposite that at which the support is carried;

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Resistance Heating (AREA)
  • Fixing For Electrophotography (AREA)
US00384537A 1972-08-22 1973-08-01 Heating arrangement for dry copying machines Expired - Lifetime US3798414A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT69686/72A IT964967B (it) 1972-08-22 1972-08-22 Perfezionamento nei dispositivi di riscaldamento per macchine co piatrici a secco

Publications (1)

Publication Number Publication Date
US3798414A true US3798414A (en) 1974-03-19

Family

ID=11312623

Family Applications (1)

Application Number Title Priority Date Filing Date
US00384537A Expired - Lifetime US3798414A (en) 1972-08-22 1973-08-01 Heating arrangement for dry copying machines

Country Status (9)

Country Link
US (1) US3798414A (fr)
JP (1) JPS5019460A (fr)
AU (1) AU5878673A (fr)
BE (1) BE803755A (fr)
BR (1) BR7306401D0 (fr)
CH (1) CH569312A5 (fr)
DE (1) DE2340427A1 (fr)
FR (1) FR2210942A5 (fr)
IT (1) IT964967B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11376877B2 (en) 2019-01-29 2022-07-05 Hewlett-Packard Development Company, L.P. Printer carriage arrangements

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS596945Y2 (ja) * 1976-12-28 1984-03-02 井関農機株式会社 穀類選別機の選別板
JPS53109677U (fr) * 1977-02-10 1978-09-02

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2162589A (en) * 1937-10-30 1939-06-13 Gen Electric Temperature control device
US2799949A (en) * 1954-07-08 1957-07-23 Richman Eli Combined dry mounting press and print drier
US3234868A (en) * 1963-12-26 1966-02-15 Minnesota Mining & Mfg Copying apparatus
US3243579A (en) * 1963-08-01 1966-03-29 Frederick Post Co Thermal developer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2162589A (en) * 1937-10-30 1939-06-13 Gen Electric Temperature control device
US2799949A (en) * 1954-07-08 1957-07-23 Richman Eli Combined dry mounting press and print drier
US3243579A (en) * 1963-08-01 1966-03-29 Frederick Post Co Thermal developer
US3234868A (en) * 1963-12-26 1966-02-15 Minnesota Mining & Mfg Copying apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11376877B2 (en) 2019-01-29 2022-07-05 Hewlett-Packard Development Company, L.P. Printer carriage arrangements

Also Published As

Publication number Publication date
DE2340427A1 (de) 1974-04-04
AU5878673A (en) 1975-02-06
JPS5019460A (fr) 1975-02-28
BE803755A (fr) 1973-12-17
BR7306401D0 (pt) 1974-07-25
CH569312A5 (fr) 1975-11-14
FR2210942A5 (fr) 1974-07-12
IT964967B (it) 1974-01-31

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