US3801057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the production of recording electrodes of the multiple needle type
Assignee: Ricoh Co Ltd
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Filing: 1972-12-05
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Granted: 1974-04-02
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Expires: 1992-12-05
Abstract
Abstract An apparatus comprising an upper mold in the form of a drum formed in its outer periphery with a thread of a very small pitch, 0.25 mm. for example, and having a wire wound in convolutions in the thread formation, and a lower metallic mold formed at its top with a plurality of upper mold support surfaces forming therebetween an upwardly diverging obtuse angle and each being formed therein with a rectangular recess for receiving a resin injected therein. The top of the lower metallic mold may be formed with an upwardly curving upper mold support surface in place of the obtuse angle forming surfaces. After the upper mold is placed on top of the lower mold with the major axis of the plurality of rectangular recesses in the latter being disposed axially of the former, an electrically insulating resin is injected in the recesses and allowed to solidify therein. After the resin has solidified, the lower mold is removed from the upper mold and the rectangular resin bars are removed from the outer periphery of the drum-shaped upper mold by severing the wire and laminated together to produce recording electrodes of the multiple needle type.
Inventors
- 👤 T Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:03
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/024; H04N1/032
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
129 words
An apparatus for the production of recording electrodes of the multiple needle type comprising a drum-shaped upper mold formed in its outer periphery with a spiral thread for winding a fine wire in convolutions of a small pitch on the spiral thread, a lower mold formed at its top with at least one support surface adapted to come into intimate contact with a lower portion of the outer periphery of the upper mold in a molding position, said at least one support surface being formed therein with a plurality of resin receiving rectangular recesses arranged parallel to the axis of the drum-shaped upper mold when the molds are in the molding position, and a plurality of resin injecting gates for injecting a resin in said resin receiving rectangular recesses.
Claim 2
Independent Claim
129 words
An apparatus for the production of recording electrodes of the multiple needle type comprising a drum-shaped upper mold formed in its outer periphery with a spiral thread for winding a fine wire in convolutions of a small pitch on the spiral thread, a lower mold formed at its top with at least one support surface adapted to come into intimate contact with a lower portion of the outer periphery of the upper mold in a molding position, said at least one support surface being formed therein with a plurality of resin receiving rectangular recesses arranged parallel to the axis of the drum-shaped upper mold when the molds are in the molding position, and a plurality of resin injecting gates for injecting a resin in said resin receiving rectangular recesses.
Claim 3
Dependent Claim
57 words
An apparatus as in claim 1 wherein said at least one support surface comprises two upwardly diverging surfaces forming therebetween an obtuse angle, and the drum-shaped upper mold is formed in its lower portion with a plurality of contact surfaces adapted to come into face-to-face contact with the upwardly diverging support surfaces formed in the lower mold.
Claim 4
Dependent Claim
66 words
An apparatus as in claim 1 wherein said at least one support surface is an upwardly facing concave surface curved to conform to the curvature of the lower portion of the periphery of the drum-shaped upper mold, so that the upper mold and the lower mold are maintained in face-to-face contact with each other when they are placed one over the other in said molding position.
Claim 5
Dependent Claim
34 words
An apparatus as in claim 1 including a plurality of support shafts connected at their bases to opposite ends of the drum-shaped upper mold and aligned with the center axis of the upper mold.
Claim 6
Dependent Claim
23 words
An apparatus as in claim 4 wherein said lower mold includes a plurality of support plates supporting said plurality of support shafts respectively.
Claim 7
Dependent Claim
22 words
An apparatus as in claim 1 wherein said resin injecting gates are provided in one of said upper mold and lowEr mold.
Claim 8
Independent Claim
168 words
An apparatus for producing recording electrodes of the multiple needle type comprising a drum-shaped first mold having around its circumference means defining a spiral thread for winding a wire in convolutions characterized by small pitch, said first mold including means defining a pair of recesses in its outer circumferential surface which are parallel to each other and extend axially, a second mold having a concave surface conforming in curvature to the curvature of the drum-shaped mold and adapted to mate with the drum-shaped mold in a molding position in which a portion of the drum-shaped mold is in intimate contact with at least a portion of the concave surface of the second mold, said second mold having on said concave surface means defining a pair of recesses aligned with the recesses of the drum-shaped mold when the molds are in the molding position, the aligned recesses forming a pair of cavities, at least one of said molds including resin injecting gates for injecting a resin into said cavities.
Claim 9
Independent Claim
168 words
An apparatus for producing recording electrodes of the multiple needle type comprising a drum-shaped first mold having around its circumference means defining a spiral thread for winding a wire in convolutions characterized by small pitch, said first mold including means defining a pair of recesses in its outer circumferential surface which are parallel to each other and extend axially, a second mold having a concave surface conforming in curvature to the curvature of the drum-shaped mold and adapted to mate with the drum-shaped mold in a molding position in which a portion of the drum-shaped mold is in intimate contact with at least a portion of the concave surface of the second mold, said second mold having on said concave surface means defining a pair of recesses aligned with the recesses of the drum-shaped mold when the molds are in the molding position, the aligned recesses forming a pair of cavities, at least one of said molds including resin injecting gates for injecting a resin into said cavities.
Claim 10
Dependent Claim
36 words
An apparatus as in claim 7 wherein said drum-shaped mold includes a pair of support shafts extending outwardly of its axially spaced ends, said shaft extending along the same centrally located axis of the drum-shaped member.
Claim 11
Dependent Claim
34 words
An apparatus as in claim 7 wherein the drum-shaped mold is disposed over the second mold and the concave surface of the second mold faces upwardly when the molds are in their molding position.
Claim 12
Dependent Claim
31 words
An apparatus as in claim 9 wherein the resin injecting gate is in the drum-shaped mold, and wherein said cavities are rectangularly shaped cavities extending axially and parallel to each other.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |