Abstract: A commutator includes a cylindrical insulator and commutator pieces, which are formed on the outer circumferential surface of the insulator and arranged side by side in the circumferential direction of the insulator. The commutator pieces are each composed of a conductive plate material, and each includes a connection claw and an engagement claw. The connection claw extends outward in the radial direction of the insulator while being configured to electrically being connected to an armature coil. The engagement claw extends inward in the radial direction of the insulator and engages with the insulator. The commutator pieces each include a recess portion with an undercut formed in a surface facing inward in the radial direction of the insulator.

Abstract: A commutator includes a cylindrical insulator and commutator pieces, which are formed on the outer circumferential surface of the insulator and arranged side by side in the circumferential direction of the insulator. The commutator pieces are each composed of a conductive plate material, and each includes a connection claw and an engagement claw. The connection claw extends outward in the radial direction of the insulator while being configured to electrically being connected to an armature coil. The engagement claw extends inward in the radial direction of the insulator and engages with the insulator. The commutator pieces each include a recess portion with an undercut formed in a surface facing inward in the radial direction of the insulator.

Abstract: A commutator includes a cylindrical insulator and commutator pieces, which are formed on the outer circumferential surface of the insulator and arranged side by side in the circumferential direction of the insulator. The commutator pieces are each composed of a conductive plate material, and each includes a connection claw and an engagement claw. The connection claw extends outward in the radial direction of the insulator while being configured to electrically being connected to an armature coil. The engagement claw extends inward in the radial direction of the insulator and engages with the insulator. The commutator pieces each include a recess portion with an undercut formed in a surface facing inward in the radial direction of the insulator.

Abstract: Coils are electrically connected to a commutator, which includes commutator segments that are arranged one after another in a circumferential direction of a dielectric body along an outer peripheral surface of the dielectric body. Each commutator segment includes a slidably contacting portion, a claw portion and a bending fulcrum portion. The slidably contacting portion is provided in one axial side of the commutator segment and is slidably contactable with each brush. The claw portion is provided in the other axial side of the commutator segment and is engageable with the corresponding coil. The bending fulcrum portion is formed on a claw portion side of the slidably contacting portion and is bent upon radially inwardly pressing the claw portion by a fusing electrode.

Abstract: A short-circuit member includes a short-circuit conductor and a short-circuit insulator. The short-circuit conductor includes superimposed first and second short-circuit member formation groups. Each of the short-circuit member formation groups has outer terminals, inner terminals, and linking portions. The outer terminals contact one another and the inner terminals contact one another between each of the short-circuit member formation groups. The linking portions are maintained in non-contact between each of the short-circuit member formation groups.

Abstract: A commutator main body 11 includes a plurality of commutator pieces 13 arranged along a circumference, the center of which is a rotation axis L of a motor, and a main body insulator 14 holding the commutator pieces. A short-circuit member 12 is arranged on an end portion of the commutator main body 11 and includes a short-circuit conductor 21, which short-circuits predetermined ones of the commutator pieces, and a short-circuit insulator 22, in which the short-circuit member is embedded. A boss is formed integrally with the short-circuit insulator so as to project from the end portion of the commutator main body.

Abstract: A commutator including a commutator main body having a plurality of commutator pieces and a short-circuit member having a short-circuit conductor for short-circuiting commutator pieces. The short-circuit conductor includes superimposed first and second short-circuit member formation groups. The first short-circuit member formation group is thinner than the second short-circuit member formation group. The first and second short-circuit member formation groups are fixed to each other by crimping projections, which are formed on the second short-circuit member formation group through punching, in a state inserted through holes, which are formed in the second short-circuit member formation group.

Abstract: Coils are electrically connected to a commutator, which includes commutator segments that are arranged one after another in a circumferential direction of a dielectric body along an outer peripheral surface of the dielectric body. Each commutator segment includes a slidably contacting portion, a claw portion and a bending fulcrum portion. The slidably contacting portion is provided in one axial side of the commutator segment and is slidably contactable with each brush. The claw portion is provided in the other axial side of the commutator segment and is engageable with the corresponding coil. The bending fulcrum portion is formed on a claw portion side of the slidably contacting portion and is bent upon radially inwardly pressing the claw portion by a fusing electrode.

Abstract: A commutator including a commutator main body having a plurality of commutator pieces and a short-circuit member having a short-circuit conductor for short-circuiting commutator pieces. The short-circuit conductor includes superimposed first and second short-circuit member formation groups. The first short-circuit member formation group is thinner than the second short-circuit member formation group. The first and second short-circuit member formation groups are fixed to each other by crimping projections, which are formed on the second short-circuit member formation group through punching, in a state inserted through holes, which are formed in the second short-circuit member formation group.

Abstract: A commutator main body 11 includes a plurality of commutator pieces 13 arranged along a circumference, the center of which is a rotation axis L of a motor, and a main body insulator 14 holding the commutator pieces. A short-circuit member 12 is arranged on an end portion of the commutator main body 11 and includes a short-circuit conductor 21, which short-circuits predetermined ones of the commutator pieces, and a short-circuit insulator 22, in which the short-circuit member is embedded. A boss is formed integrally with the short-circuit insulator so as to project from the end portion of the commutator main body.

Abstract: A short-circuit member includes a short-circuit conductor and a short-circuit insulator. The short-circuit conductor includes superimposed first and second short-circuit member formation groups. Each of the short-circuit member formation groups has outer terminals, inner terminals, and linking portions. The outer terminals contact one another and the inner terminals contact one another between each of the short-circuit member formation groups. The linking portions are maintained in non-contact between each of the short-circuit member formation groups.

Abstract: The present invention provides an overcoated sheet which comprises forming, on at least one surface of a substrate, an overcoat layer consisting essentially of styrene/butylmethacrylate/unsaturated organic acid system copolymer, and is used as a transfer sheet for use in a plain-paper copier, a drafting film, a diazo second original film and the like.