ELECTRIC PENCIL SHARPENER

• US 3,746,061 A
• Filed: 09/16/1971
• Issued: 07/17/1973
• Est. Priority Date: 09/16/1970
• Status: Expired due to Term

• Current Assignee: Kenichi Nakazaki
• Original Assignee: Kenichi Nakazaki
• Inventors: Nakazaki, Kenichi
• Primary Examiner(s): Juhasz, Andrew R.
• Assistant Examiner(s): Coan, James F.
• Application Number:
  US05/181,039
• Time in Patent Office: 670 Days
• Field of Search: 144/28.3,28.4,28.5,28.6,28.7,28.72
• US Class Current: 144/28.5
• CPC Class Codes: B43L 23/02 with gearing

Abstract

An electric pencil sharpener having a cutter holder rotatably mounted on a casing and rotatably supporting at a desired inclination to the axis thereof a cylindrical cutting member having multiple spiral cutting edges integrally formed theron and facing in the direction of insertion of a pencil to be sharpened. Control means are provided for automatically stopping the sharpener when the operation has been completed and for illuminating a lamp to visually indicate that the pencil has been properly sharpened.

Claims

1. An electric pencil sharpener comprising:

a casing;

an electric motor mounted in said casing;

a cutter holder rotatably mounted in said casing;

means connecting said electric motor and said cutter holder for rotating said cutter holder;

a cylindrical cutter rotatably mounted in said cutter holder;

multiple spiral edges integrally formed on said cutter surface and facing in the same direction as a pencil being inserted into said cutter holder;

means for rotating said cutter about its axis while said cutter holder rotatably supporting the same is being rotated by said electric motor, whereby said cutter is also rotated about one end of said pencil inserted in said cutter holder;

control means having a cam plate mounted on said casing;

a cam shaft rotatably mounted on said cam plate;

a dial mounted on one end of said cam shaft;

a cam mounted on the other end of said cam shaft;

a switch lever rotatably mounted on said cam plate;

a control switch mounted on said switch lever;

mean for adjusting the position of said control switch relative to said cam shaft; and

, means disposed between said cutter and said switch lever and engageable by said pencil being sharpened for actuating said control switch for stopping the rotation of said cutter holder when the pencil sharpening operation has been completed.

2. An electric pencil sharpener comprising:

a casing;

an electric motor mounted in said casing;

a cutter holder rotatably mounted in said casing;

means connecting said electric motor and said cutter holder for rotating said cutter holder;

a cylindrical cutter rotatably mounted in said cutter holder;

multiple spiral edges integrally formed on said cutter surface and facing in the same direction as a pencil being inserted into said cutter holder;

means for rotating said cutter about its axis while said cutter holder rotatably supporting the same is being rotated by said electric motor, whereby said cutter is also rotated about one end of said pencil inserted in said cutter holder;

indicating means mounted in said casing for stopping the rotation of said cutter holder when the pencil sharpening operation has been completed;

detecting means for detecting the presence of the lead point of said pencil being sharpened at a predetermined position in said cutter holder;

means responsive to said detecting means for actuating said indicating means when said pencil lead point is at said predetermined position to stop said sharpening operation; and

means for preventing de-actuation of said indicating means until said pencil is completely withdrawn from said cutter holder.