LEAD SCREW FOR HEAD SHIFT

Title:

LEAD SCREW FOR HEAD SHIFT

Document Type and Number:

Japanese Patent JPS608563

Kind Code:

A

Abstract:

PURPOSE:To facilitate production and reduce the cost by forming a screw groove in a shape that part of a groove bottom is not hidden by the tip of the groove in a lead screw made of synthetic resin used for the head shift of a printing head of a printer, etc. CONSTITUTION:When providing a spiral groove 7 on the peripheral surface of a lead screw 9, a cross section shape is formed so that a bottom is shrunk by L and side walls are slanted and the following equation is satisfied, L>=P/360. [cos<-1>(r.sintheta/2)/R-cos<-1>sintheta/2], where L is the shrinkage of the bottom on one side, P is the pitch of the groove 7, R and (r) are the radius of the lead screw 9 and the groove bottom, theta is the flute spacing angle (center angle) of a mold. Thereby, an undercut section that part of the groove bottom is hidden by the outer edge section of the groove 7 is never generated, thus a lead screw can be easily produced by the plastic molding.

Inventors:

IKEDA YOSHIAKI
TAMURA YOSHIO
NORITAKE HIROSHI

Application Number:

JP10380583A

Publication Date:

January 17, 1985

Filing Date:

June 10, 1983

Export Citation:

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Assignee:

SEIKOSHA KK

International Classes:

B29D1/00; B41J19/18; B41J19/20; F16H25/24; G11B21/02; (IPC1-7): F16H25/24

Attorney, Agent or Firm:

Kazuko Matsuda

Next Patent: JPS608564