Abstract: A chuck (4) for grasping a writing lead and a rotor (6) arranged to be movable together in a direction of rotation and an axial direction within a body cylinder (1). A rotational drive mechanism for the writing lead is formed such that 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 (14a) are arranged on the body cylinder side to face the above-mentioned first and second cam faces respectively. Retreat operation and forward movement (cushion action) of the writing lead by writing pressure are provided with a damping effect by sticky grease (19) interposed between a stopper (16) and a torque canceller (17). As a result, a sense of uncomforting, when writing, generated in conjunction with the cushion action can be reduced.

Abstract: A chuck (4) for grasping a writing lead and a rotor (6) arranged to be movable together in a direction of rotation and an axial direction within a body cylinder (1) are provided. A rotational drive mechanism for the writing lead is formed such that 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 (14a) are arranged on the body cylinder side to face the above-mentioned first and second cam faces respectively. Retreat operation and forward movement (cushion action) of the writing lead by writing pressure are provided with a damping effect by sticky grease (19) interposed between a stopper (16) and a torque canceller (17). As a result, a sense of uncomforting, when writing, generated in conjunction with the cushion action can be reduced.

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 (4) for grasping a writing lead and a rotor (6) arranged to be movable in a direction of rotation and an axial direction within a body cylinder (1) are provided. A rotational drive mechanism for the writing lead is formed such that 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 (14a) are arranged on the body cylinder side to face the above-mentioned first and second cam faces respectively. An indicator (6c) of a wedge-shaped notch is formed at a part of the rotor. The indicator can be observed through the body cylinder made of a transparent material. By this structure, a mechanical pencil is provided in which operation of the writing lead that is gradually rotated by way of writing pressure can be known certainly.

Abstract: A chuck (4) for grasping a writing lead and a rotor (6) arranged to be movable in a direction of rotation and an axial direction within a body cylinder (1). A rotational drive mechanism for the writing lead is formed such that 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 (14a) are arranged on the body cylinder side to face the above-mentioned first and second cam faces respectively. A pipe end (7) for guiding the writing lead to interlock with retreat and forward movement of the writing lead while the writing proceeds is arranged to move in the same direction, in conjunction with retreat and forward movement of the above-mentioned chuck.

Abstract: A chuck (4) for grasping a writing lead and a rotor (6) arranged to be movable in a direction of rotation and an axial direction within a body cylinder (1). A rotational drive mechanism for the writing lead is formed such that 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 (14a) are arranged on the body cylinder side to face the above-mentioned first and second cam faces respectively. An indicator (6c) of a wedge-shaped notch is formed at a part of the rotor. The indicator can be observed through the body cylinder made of a transparent material. By this structure, a mechanical pencil is provided in which operation of the writing lead that is gradually rotated by way of writing pressure can be known certainly.

Abstract: A chuck (4) for grasping a writing lead and a rotor (6) arranged to be movable in a direction of rotation and an axial direction within a body cylinder (1) are provided. By axial movement of the rotor in conjunction with writing operation, the rotor rotates and the writing lead is also subjected to rotational movement. The writing lead can be inched out of the chuck by way of knock operation of the knock cover (26) arranged at a rear end port ion of the body cylinder. A separation part having a gap (G) is formed at any location along a knock operation transmitting path between the above-mentioned knock cover and the above-mentioned chuck, the separation part transmits the above-mentioned knock operation to the above-mentioned chuck and inhibits rotation operation from being transmitted. According to the above-mentioned structure, as the rotor and the knock cover are separated in a direction of rotation, it is possible to solve the problem of placing an obstacle to a rotational drive mechanism.

Abstract: A chuck (4) for grasping a writing lead and a rotor (6) arranged to be movable in a direction of rotation and an axial direction within a body cylinder (1) are provided. A rotational drive mechanism for the writing lead is formed such that 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 (14a) are arranged on the body cylinder side to face the above-mentioned first and second cam faces respectively. A pipe end (7) for guiding the writing lead to interlock with retreat and forward movement of the writing lead while the writing proceeds is arranged to move in the same direction, in conjunction with retreat and forward movement of the above-mentioned chuck.

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.

Abstract: A lead holding structure of a mechanical pencil where a predetermined lead holding force is maintained so that a lead does not move even if a writing pressure is repeatedly applied to the lead and where a so-called biting-off of a lead (break) is prevented without damaging the lead in repeatedly sending forward and backward operations.

Abstract: [Purpose] To provide a lead holding structure of a mechanical pencil where a predetermined lead holding force is maintained so that a lead does not move even if a writing pressure is repeatedly applied to the lead and where a so-called biting-off of a lead (break) is prevented without damaging the lead in repeatedly sending forward and backward operations. [Configuration] An outer periphery 5b of a chuck 5 corresponding to a lead holding section 5a is composed of a peripheral surface (horizontal surface) 5c and a peripheral surface (inclined surface) 5d. The peripheral surface 5c extends from substantially the center of the outer periphery 5b to its forward end and is substantially parallel to an axis or inclined toward the axis. The peripheral surface 5d extends from substantially the center backward and is a surface orthogonal to the axis or inclined toward the axis.

Abstract: A grip using a gel substance capable of preserving its own shape is provided in a grip portion of a barrel of a writing implement. An outer coat for covering the grip portion of the barrel 1 is provided. The gel substance is located between the outer coat and the barrel, and comes in direct contact with the barrel. A centering member for positioning the outer coat coaxially with the barrel is provided between the outer coat and the barrel. The centering member is provided with an opening for allowing a space between the outer coat and the barrel to communicate with the outside of the space. The gel substance is formed by injecting a sol substance, which is a raw material, through the opening and by crosslinking the sol substance under a predetermined condition.

Abstract: The lead propelling device of the invention is a lead propelling device having a structure for gripping and releasing the lead by a lead gripping mechanism by knocking operation, not transmitting the knocking force to the lead gripping mechanism in knock forward operation, wherein a stopper not allowing the lead to pass by its own weight interlocks with the knock operation, the lead abuts against the stopper rear end upon release of the lead, the lead is inserted into the stopper after gripping the lead in knock backward operation, thereby propelling the lead, and therefore after the knock operation part advances by a predetermined distance, the lead gripping mechanism clears gripping of the lead, and when the lead gripping mechanism grips the lead in the backward stroke of the knock operation part, the knock operation part is set to be movable backward further by a predetermined distance.

Abstract: A grip 2a using a gel substance 4 capable of preserving its own shape is provided in a grip portion 2 of a barrel 1 of a writing implement 50. An outer coat 3 for covering the grip portion 2 of the barrel 1 is provided. The gel substance 4 is located between the outer coat 3 and the barrel 1, and comes in direct contact with the barrel 1. A centering member 40 for positioning the outer coat 3 coaxially with the barrel 1 is provided between the outer coat 3 and the barrel 1. The centering member 40 is provided with an opening 41 for allowing a space between the outer coat 3 and the barrel 1 to communicate with the outside of the space. The gel substance 4 is formed by injecting a sol substance, which is a raw material, through the opening 41 and by crosslinking the sol substance under a predetermined condition. Thereby, effects of improving the grip feeling in the grip portion of the writing implement and decreasing fatigue caused by long use are provided to the user.

Abstract: The lead propelling device of the invention is a lead propelling device having a structure for gripping and releasing the lead by a lead gripping mechanism by knocking operation, not transmitting the knocking force to the lead gripping mechanism in knock forward operation, wherein a stopper not allowing the lead to pass by its own weight interlocks with the knock operation, the lead abuts against the stopper rear end upon release of the lead, the lead is inserted into the stopper after gripping the lead in knock backward operation, thereby propelling the lead, and therefore after the knock operation part advances by a predetermined distance, the lead gripping mechanism clears gripping of the lead, and when the lead gripping mechanism grips the lead in the backward stroke of the knock operation part, the knock operation part is set to be movable backward further by a predetermined distance.