Mitsubishi Pencil Kabushiki Kaisha

Mitsubishi Pencil Company, Limited

Koichi Hirano

Yoichi Ando

Hajime Toda

Hisami Tamano

Susumu Suzuki

Fumitoshi Nakamura

Haruhito Shiraishi

A ball-point pen, wherein a cover member () is fitted to a joint member () connecting a writing tip () rotatably supporting a writing ball () at the tip thereof to an ink storage tube. When the cover member () is fitted to the joint member () along the outer peripheral surface thereof, a part of the cover member does not come within 0.2 mm (within the range of the chain double-dashed line) from around the writing tip. Thus, even if the accuracies of parts and assembly machines are dispersed, a problem with an existing ball-point pen wherein a cover member is brought into contact with a writing tip and the writing tip is damaged in an assembly step can be avoided.

Ball-point pen

A process for producing a self-inking stamp capable of stamping repeatedly by filling ink in a stamp material having a continuous porous structure, wherein the stamp material having a continuous porous structure is provided with an occlusion body having a continuous porous structure and being impregnated with two or more kinds of ink having different functions so as to infiltrate two or more kinds of ink into the stamp material. In the process, there is used an occlusion body having a physical barrier and/or an isolation part which suppresses or inhibits mingling of two or more kinds of ink having different functions, and a self-inking stamp produced by the process.

Process for producing self-inking stamp and self-inking stamp

In order to supply a multiple number of inks at a desired geometry, a filling frame has filling ports of substantially vertical passage holes. A stamp piece has a continuous porous structure and is placed on a base plate with the filling framed laid thereover. Each ink is supplied from a corresponding filling port to a separated area and is impregnated into a stamp piece in substantially the same geometry as that of separated area so that each will not mix with the other. Thus, inks are filled keeping the separation, into the stamp piece having a continuous porous structure laid below the filling frame.

Method of producing an impregnation stamp and an impregnation stamp

On the surface of an ink-permeable sponge material having open cells, a melted portion and an unmelted portion are formed by a thermal head printer controlled by a memory processor for desired imprint data to prepare a stamp having the unmelted portion as an ink oozing imprint surface. Furthermore, a stamp material plate comprising the tape-like sponge material is wound up in the form of a roll and then received in a cassette case, and a stamp material cartridge comprising this cassette case is mounted in a cartridge receiving section of the thermal printer capable of printing in a tape form. A print image set by input from a keyboard or external input is printed on the stamp material comprising the sponge material fed from the cartridge by the thermal head, while the stamp material is pressed, to form a concave having a depth of 0.01 mm or more, thereby preparing a print plate for a stamp having a suitable length. A process for preparing a stamp of the present invention comprises simple steps, and therefore the high-quality stamp can be promptly provided.

Process for preparing stamp

A cartridge containing a thermosensitive stencil original comprising a tape-formed thermosensitive stencil original which is to be perforated to create a print image, a pressing member for pressing the thermosensitive stencil original, and a cassette case having the pressing member disposed therein. The thermosensitive stencil original is also accommodated inside the cassette case so that the stencil original may be carried out from the cartridge. The mirror image of the desired print image is perforated onto the surface of the thermosensitive stencil original.

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Yokohama, Japan

Koichi Hirano