Abstract: A writing lead (10) is grasped and released by reciprocation of a chuck (3) provided in a body cylinder (1) so as to inch the writing lead forward and a rotational drive mechanism is provided for rotationally driving a rotor (5) in one direction in conjunction with retreat operation by the writing pressure applied to the writing lead and forward movement by releasing the writing pressure. A pipe support member (8) for supporting a pipe end (7) is accommodated in a base (1A) which constitutes a front end portion of the body cylinder, and a retreat drive mechanism is provided for gradually retreating the pipe support member into the body cylinder in conjunction with rotational drive operation of the rotor. With the above-mentioned structure, a pipe-slide type mechanical pencil can maintain an amount of projection of the writing lead from the pipe end within a certain range.

Abstract: A chuck unit (4) for grasping a writing lead (10) and a rotor (6) arranged to be movable in a direction of rotation and an axial direction within a body cylinder (1) are provided. First and second cam faces (6a) and (6b) are respectively formed at one end face and another end face of the rotor in the axial direction, and first and second fixed cam faces (13a) and (17a) are arranged on the body cylinder side to face the first and second cam faces respectively. The first cam face in the rotor is brought into abutment with and meshed with the first fixed cam face by retreat operation of the chuck unit under writing pressure, and the second cam face in the rotor is brought into abutment with and meshed with the second fixed cam face by releasing the writing pressure, so that the rotor rotates, whereby the writing lead also rotates.

Abstract: A method of moulding a composite member and a composite member are provided in which a convex part can be formed at one member by moulding the other member integrally to the one member. A concave part 10a is provided at least at a part inside a metal mould 10 located on the side opposite the second member fusion bonding surface side of the above-mentioned first member 6b, the above-mentioned second thermoplastic material is melted and ejected to the second member fusion bonding surface side of the first member 6b, the first member 6b is changed in shape by injection pressure of the melted second thermoplastic material, and a convex part 6a is formed at the first member.

Abstract: It is arranged that a writing lead (10) is grasped and released by reciprocation of a chuck (3) provided in a body cylinder (1) so as to inch the above-mentioned writing lead forward and a rotational drive mechanism is provided for rotationally driving a rotor (5) in one direction in conjunction with retreat operation by the writing pressure applied to the above-mentioned writing lead and forward movement by releasing the writing pressure. A pipe support member (8) for supporting a pipe end (7) is accommodated in a base (1A) which constitutes a front end portion of the above-mentioned body cylinder, and a retreat drive mechanism is provided for gradually retreating the pipe end supported by the above-mentioned pipe support member towards the above-mentioned body cylinder in conjunction with rotational drive operation of the above-mentioned rotor which constitutes the above-mentioned rotational drive mechanism.

Abstract: A chuck unit (4) for grasping a writing lead (10) and a rotor (6) arranged to be movable in a direction of rotation and an axial direction within a body cylinder (1) are provided. First and second cam faces (6a) and (6b) are respectively formed at one end face and another end face of the rotor in the axial direction, and first and second fixed cam faces (13a) and (17a) are arranged on the body cylinder side to face the first and second cam faces respectively. The first cam face in the rotor is brought into abutment with and meshed with the first fixed cam face by retreat operation of the chuck unit under writing pressure, and the second cam face in the rotor is brought into abutment with and meshed with the second fixed cam face by releasing the writing pressure, so that the rotor rotates, whereby the writing lead also rotates.

Abstract: A chuck unit (4) for grasping a writing lead (10) and a rotor (6) arranged to be movable in a direction of rotation and an axial direction within a body cylinder (1) are provided. First and second cam faces (6a) and (6b) are respectively formed at one end face and another end face of the rotor in the axial direction, and first and second fixed cam faces (13a) and (17a) are arranged on the body cylinder side to face the first and second cam faces respectively. The first cam face in the rotor is brought into abutment with and meshed with the first fixed cam face by retreat operation of the chuck unit under writing pressure, and the second cam face in the rotor is brought into abutment with and meshed with the second fixed cam face by releasing the writing pressure, so that the rotor rotates, whereby the writing lead also rotates.

Abstract: A chuck unit (4) for grasping a writing lead (10) and a rotor (6) arranged to be movable in a direction of rotation and an axial direction within a body cylinder (1) are provided. First and second cam faces (6a) and (6b) are respectively formed at one end face and another end face of the rotor in the axial direction, and first and second fixed cam faces (13a) and (17a) are arranged on the body cylinder side to face the first and second cam faces respectively. The first cam face in the rotor is brought into abutment with and meshed with the first fixed cam face by retreat operation of the chuck unit under writing pressure, and the second cam face in the rotor is brought into abutment with and meshed with the second fixed cam face by releasing the writing pressure, so that the rotor rotates, whereby the writing lead also rotates. Thus, it is possible to provide a mechanical pencil having a rotational drive mechanism in which the writing lead can be rotated by using the writing pressure.

Abstract: A method of moulding a composite member and a composite member are provided in which a convex part can be formed at one member by moulding the other member integrally to the one member. A concave part 10a is provided at least at a part inside a metal mould 10 located on the side opposite the second member fusion bonding surface side of the above-mentioned first member 6b, the above-mentioned second thermoplastic material is melted and ejected to the second member fusion bonding surface side of the first member 6b, the first member 6b is changed in shape by injection pressure of the melted second thermoplastic material, and a convex part 6a is formed at the first member.