US3847342A - Apparatus for the production of recording electrodes of the multiple needle type - Google Patents

Apparatus for the production of recording electrodes of the multiple needle type Download PDF

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Publication number
US3847342A
US3847342A US00312941A US31294172A US3847342A US 3847342 A US3847342 A US 3847342A US 00312941 A US00312941 A US 00312941A US 31294172 A US31294172 A US 31294172A US 3847342 A US3847342 A US 3847342A
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United States
Prior art keywords
lower mold
resin
mold
wire
recesses
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
US00312941A
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English (en)
Inventor
T Matsuura
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.)
Ricoh Co Ltd
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Ricoh Co Ltd
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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
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Publication of US3847342A publication Critical patent/US3847342A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14639—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles for obtaining an insulating effect, e.g. for electrical components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14336—Coating a portion of the article, e.g. the edge of the article
    • B29C45/14385—Coating a portion of a bundle of inserts, e.g. making brushes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/024—Details of scanning heads ; Means for illuminating the original
    • H04N1/032—Details of scanning heads ; Means for illuminating the original for picture information reproduction

Definitions

  • ABSTRACT An apparatus comprising an upper mold formed at its top with a plurality of resin injecting gates and on its lower surface with a plurality of rectangular recesses, and a lower mold having a planar upper surface and a substantially convex lower surface and being formed on the planar upper surface with a plurality of rectangular resin receiving recesses disposed parallel to each other and along the longitudinal axis of the lower mold, the lower mold having a very fine wire wound thereon in convolutions in predetermined spaced apart relationship.
  • a resin is injected through the resin injecting gates into a cavity formed by the rectangular recesses in the upper and lower molds and allowed to solidify therein so as to fix portions of the wire convolutions disposed in the resin receiving recesses.
  • a printed board is applied to each side of the upper portion of the lower mold, and the wire is wound on the two printed boards as well as the lower mold. Then, the two printed boards are electrically connected to the wire before the latter is cut and removed from the lower mold on which it is wound.
  • a set of recording electrodes of the multiple needle type When an electrostatic recording means is employed for reproducing and recording the image transmitted to a remote place by a facsimile system, it has been customary to use a set of recording electrodes of the multiple needle type as an electrostatic recording head.
  • a set of recording electrodes of the multiple needle type generally comprisetwo to several thousands of very fine needles arranged parallel to one another in predetermined spaced apart relationship and fixed by a thermosetting resin.
  • the needles are generally obtained by severing required lengths of a wire wound spirally in convolution at a predetermined pitch-
  • at least one resin receiving recess is formed onone portion of the periphery of a drum and disposed parallel to the longitudinal axis of the drum, and a thermosetting resin is injected in the recess and allowed to solidify after a wire is wound peripherally on the drum at a predetermined pitch, so that portions of p the wire convolutions disposed in the recess can be fixed in the resin and a needle supporting resin plate can be obtained.
  • a set of recording electrodes of the multiple needle type generally comprises a multitude of needles arranged in two levels, the needles of each level being disposed parallel to each other in predetermined spaced apart relationship as aforementioned and the needles of the two levels beingstaggered so that one needle of one level is disposed between the two adjacent needles of the other level.
  • the problem is that, when two rectangular recesses'are formed on the periphery of a drum, the recesses are inclined in opposite directions and difficulty is experienced in injecting a resin thereinto without leakage. Moreover, difficulty is experienced in electrically connecting the needles arranged in predetermined spaced apart relationship and fixed in-the resin to the printed boards.
  • This invention relates to an apparatus for the production of recording electrodes of the multiple needle type.
  • One object of the invention is to provide an apparatus for the production of recording electrodes of the multiple needle type comprising a lower mold having a planar upper surface and a substantially convex lower surface which facilitates the production of recording electrodes of the multiple needle type.
  • Anotherobject is to provide an apparatus for the production of recording electrodes of the multiple needle type comprising a lower mold having a planar upper surface, a substantially convex lower surface and planar upper side surfaces which facilitates the provision of electric connections between printed boards and the recording electrodes of the multiple needle type.
  • an apparatus for the production of recording electrodes of the multiple needle type comprising a lower mold having a planar upper surface and a substantially convex lower surface, said planar upper surface being formed thereon with a plurality of resin receiving rectangular recesses disposed parallel to each other and along the longitudinal axis of the mold, SlllCl'l lower mold being adapted to have awire wound spirally in convolutions on its periphery in predetermined spaced apart relationship, and an upper mold formed on its lower surface with a plurality of shallow rectangular recesses in positions corresponding to those of the recesses formed in the lower mold and in its upper portion with at least one resin injecting gate for injecting therethrough a resin into a cavity formed by the rectangular recesses in the upperand lower molds.
  • a multitude of minuscule grooves of a predetermined dimension spaced apart from one another a predetermined distance may be formed peripherally in the substantially convex lower surface of the lower mold and a wire is wound on the lower mold so that the wire convolutions may be fitted in the grooves, thereby permitting the wire to be wound at a predetermined pitch and disposed in an orderly manner on the planar upper surface of the lower mold to produce resin plates supporting a multitude of nee-- dlesarranged in predetermined spaced apart relationship.
  • the upper side surfaces of the: lower mold may be formed in planar form, so that printed circuit boards may be each applied to one of the planar upper side surfaces before the wire is wound spirally on the lower mold. This facilitates the provision of electric connec- "tions between the needles of the resin plates to the printed circuit boards.
  • a lower mold 1 shown in FIGS. 1 and 2 comprises a mold proper 2 and a suppport 3 which define therebetween a space 4 having a heater 5 mounted therein for heating mold proper 2 to a suitable temperature between 50 and 80 C.
  • the support 3 of lower mold 1 includes a substantially convex lower surface which is received in a complementary groove formed in a bed 6.
  • the mold proper 2 of lower mold 1 includes a planar upper surface in which a plurality of relatively deep rectangular recesses 7 are formed and disposed parallel to the longitudinal axis of lower mold 1.
  • An upper mold 8 is formed on its lower surface with a plurality of relatively shallow rectangular recesses 9 in positions corresponding to those of the rectangular recesses 7 formed in lower mold l to define therebetween a cavity.
  • Resin injecting gates 11 and 12 are formed nearopposite ends of the major axis of upper mold 8, as shown in FIG. 2, and have tubular ends 13a and 14a of resin injecting jigs 13 and 14 inserted therein respectively.
  • Lower mold 1 has planar opposite side surfaces as shown in FIG. 2, and printed circuit boards 15 and 16 are each applied to one side surface of lower mold l.
  • a wire 17 is peripherally wound spirally in convolutions on lower mold 1 at a predetermined pitch or 0.25 mm., for example.
  • the substantially convex lower surface of lower mold 1 may be formed therein with a multitude of minuscule grooves of predetermined dimension spaced apart from one another a predetermined distance or 0.25 mm., for example.
  • a plurality of shafts 20 are each connected to one of opposite ends of lower mold l to facilitate winding of wire 17 from a wire winder on lower mold by mounting lower mold on the wire winder through shafts 20.
  • thermosetting resin is injected into injecting jigs 13 and 14 and poured through gates 11 and 12 into the cavity defined by rectangular recesses 7 and 9 where it is allowed to set, so that portions of the wire convolutions disposed in the rectangular recesses can be fixed in position in the solid resin. Since lower mold 1 is constantly heated by the heater 5 mounted in mold proper 2, the detrimental effect of rapid cooling of the resin injected in the recesses 7 and 9 can be prevented.
  • a set of recording electrodes of the multiple needle type comprising a multitude of needle electrodes arranged in two levels, the needle electrodes of the two le 'els being staggered so that each needle of one level is isposed between the two adjacent needles of the other level and ends of the needles are arranged in two straight lines as seen lengthwise from one of the laminate toward the other end.
  • An apparatus for the production of recording electrodes of the multiple needle type comprising a lower mold having a planar upper surface and a substantially convex lower surface, said planar-upper surface being formed thereon with a plurality of resin receiving rectangular recesses disposed parallel to each other and along the longitudinal axis of the lower mold, said lower mold being adapted to have a wire wound spirally in convolutions on its periphery in predetermined spaced apart relationship, and an upper mold formed on its lower surface with a plurality of shallow rectangular recesses in positions corresponding to those of the resin receiving recesses formed in the lower mold and in its upper portion with at least one resin injecting gate for injecting therethrough a resin into a cavity formed by the rectangular recesses in the upper and lower molds, to thereby embed in resin a plurality of parallel lengths of wire, each length being that part of a convolution of wire wound over the lower mold which is within said cavity, while the remainder of the wire length of the convolution is not embedded in resin.
  • said lower mold comprises a mold proper and a supporter disposed one over the other, and a heater mounted between said mold proper and said supporter.
  • An apparatus for producing recording electrodes of the multiple needle type comprising: a lower mold having a planar upper surface and a substantially convex lower surface, said planar upper surface having means defining a plurality of resin receiving recesses each extending along the longitudinal axis of the lower mold, said lower mold having means for receiving a wire wound spirally in convolutions around the outer periphery of the lower mold and over said recesses therein in predetermined spaced apart relationship, and an upper mold formed on its lower surface with a plurality of shallow recesses disposed in positions corresponding to those of the resin receiving recesses in the lower mold and formed in its upper portion with at least one resin injecting gate for injecting therethrough a resin into a cavity fonned by the facing recesses in the upper and lower molds, whereby a plurality of convolutions of wire can be wound around the outer periphery of the lower mold, said convolution being in predetermined spaced-apart relationship, and the wire portions which extend through said cavity can be embedded in resin injected there

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Facsimile Heads (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Electrophotography Using Other Than Carlson'S Method (AREA)
  • Fax Reproducing Arrangements (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
US00312941A 1971-12-16 1972-12-07 Apparatus for the production of recording electrodes of the multiple needle type Expired - Lifetime US3847342A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10217471A JPS553144B2 (enExample) 1971-12-16 1971-12-16

Publications (1)

Publication Number Publication Date
US3847342A true US3847342A (en) 1974-11-12

Family

ID=14320314

Family Applications (1)

Application Number Title Priority Date Filing Date
US00312941A Expired - Lifetime US3847342A (en) 1971-12-16 1972-12-07 Apparatus for the production of recording electrodes of the multiple needle type

Country Status (4)

Country Link
US (1) US3847342A (enExample)
JP (1) JPS553144B2 (enExample)
DE (1) DE2261529C3 (enExample)
GB (1) GB1353880A (enExample)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4540151A (en) * 1982-05-07 1985-09-10 Dr. -Ing. Rudolf Hell Gmbh Device for manufacturing multiple needle recording electrode
WO1993024949A1 (en) * 1992-06-01 1993-12-09 Teledyne Industries, Inc. Microwave switch

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2526877A (en) * 1947-03-26 1950-10-24 Us Rubber Co Molding apparatus
US2714226A (en) * 1949-10-11 1955-08-02 Westinghouse Electric Corp Apparatus for molding plastic materials
US2882504A (en) * 1953-10-13 1959-04-14 American Molded Products Co Plastic encased coil
US3221089A (en) * 1960-07-01 1965-11-30 James H Cotton Method for capacitor fabrication

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2526877A (en) * 1947-03-26 1950-10-24 Us Rubber Co Molding apparatus
US2714226A (en) * 1949-10-11 1955-08-02 Westinghouse Electric Corp Apparatus for molding plastic materials
US2882504A (en) * 1953-10-13 1959-04-14 American Molded Products Co Plastic encased coil
US3221089A (en) * 1960-07-01 1965-11-30 James H Cotton Method for capacitor fabrication

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4540151A (en) * 1982-05-07 1985-09-10 Dr. -Ing. Rudolf Hell Gmbh Device for manufacturing multiple needle recording electrode
US4607268A (en) * 1982-05-07 1986-08-19 Dr.-Ing. Rudolf Hell Gmbh Multiple needle recording electrode
US4617727A (en) * 1982-05-07 1986-10-21 Dr. Ing. Rudolf Hell Gmbh Electrode comb and method and device for manufacturing
WO1993024949A1 (en) * 1992-06-01 1993-12-09 Teledyne Industries, Inc. Microwave switch

Also Published As

Publication number Publication date
JPS4866719A (enExample) 1973-09-12
DE2261529B2 (de) 1973-10-04
GB1353880A (en) 1974-05-22
JPS553144B2 (enExample) 1980-01-23
DE2261529C3 (de) 1979-03-15
DE2261529A1 (de) 1973-07-05

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