Seiko Epson Corporation

Takashi Asada

Masaki Shimomura

Osamu Koshiishi

Yasuhiko Nakazawa

Minoru Tanaka

Kiyofumi Koike

Kazuhiko Yamamoto

A print head for an impact dot printer capable of printing on a printing medium is provided. The print head includes a plurality of print wires and a front end guide having guide holes for guiding the print wires to predetermined print positions. The front end guide has a front surface through which the print wires extend. A guide holding member is provided for holding the front end guide. Lubricant is injected into a back portion of the front end guide to reduce the friction between the print wires and the front end guide during the printing operation. The printer head includes projection members for holding the ink ribbon away from the guide means. The projection members are provided on the front surface of the guide members. The interface between the front end guide and the nose of the print head is provided with structure for preventing the passage of lubricant therebetween.

Print head for an impact dot printer

An improved wire dot print head for increased integrated density is provided. The wire dot print head includes a frame. A plurality of drive coils are mounted within the frame. A lever for driving print wires has a print wire mounted at one end and its other end formed as a hook to act as a rotation support member. When an excitement current flows through the coil, the lever is caused to move so that the print wires rotate about the rotation support member causing the print wires to strike a platen. The wires guided by guide holes which form a circular array at one armature end, and a row or rows at the printing end.

Wire dot print head and method for manufacturing same

Disclosed is an impact dot head and an impact dot printer provided as not causing wire breakage by supporting a wire performing a printing operation so as to be resiliently oscillatable in a printing digit direction even if the impact dot head starts printing from a position outside a printing sheet due to erroneous setting of a printing area and therefore passes an end of the printing sheet while performing the printing operation.

Impact dot head with resiliently mounted wire guide

An improved wire dot print head for increased integrated density is provided. The wire dot print head includes a frame. A plurality of drive coils are mounted within the frame. A lever for driving print wires has a print wire mounted at one end and its other end formed as a hook to act as a rotation support member. A yoke has salients formed thereon equal in number to that of the levers disposed on its end surface. The rotation support member of each lever is retained with a recess formed within a respective yoke and an end surface of the frame and is affixed in place by a retainer spring. When an excitement current flows through the coil, the lever is caused to move so that the print wires rotate about the rotation support member causing the print wires to strike a platen.

Wire dot print head with rotating lever

A serial printer having a dot type printing head for printing on a paper. The printer includes 2N columns of dot forming elements where N is a positive integer equal to 2 or more and a carriage supported on the printer for reciprocal movement across the paper in a carriage direction. The columns of dot forming elements are supported on the carriage for selectively printing dots on a paper. Each column of the dot forming elements is spaced a predetermined distance from adjacent columns of the dot forming elements in the carriage direction. Each dot forming element column includes a plurality of dot forming elements arranged in a line and spaced apart from one another in the column direction by a dot pitch substantially equal to N. A drive system selectively drives selected dot forming elements in each column of dot forming elements by one of an even number timing and an odd number timing. Each column of dot forming elements driven by an even number timing is shifted in the column direction by one dot with respect to each other column of dot forming elements driven by an even number timing. Each column of dot forming elements driven by an odd number timing is shifted in a column direction by one dot with respect to each other column of dot forming elements driven by an odd number timing. Each column of dot forming elements driven by an even number timing is shifted in the column direction by less than about 1/3 dot pitch with respect to at least one column of dot forming elements driven by an even number timing.

Print element arrangement in serial matrix printer

An improved wire dot print head for increased integrated density is provided. The wire dot print head includes a frame. A plurality of drive coils are mounted within the frame. A lever for driving print wires has a print wire mounted at one end and its other end formed as a hook to act as a rotation support member. A yoke has salients formed thereon equal in number to that of the levers disposed on its end surface. The rotation support member of each lever is retained with a recess formed within a respective yoke and an end surface of the frame and is affixed in place by a retainer spring. When an excitement current flows through the coil, the lever is caused to move so that the print wire rotate about the rotation support member causing the print wires to strike a platen.

An improved impact dot print head having improved electrical integrity and improved heat radiating qualities is provided. The print head includes a magnetic frame, a plurality of solenoids coil for driving print wires mounted on the frame, a nose for guiding the wires, a printed circuit board mounted on the nose and electrically connected to a terminal part of the solenoid coil holes in a spacer disposed between the frame and printed circuit board. The spacer, frame, printed circuit board and nose are positioned to prevent rotational and translational movement. The spacer is an insulating material or metal coated with an insulator for radiating heat away from the print head and allows a low viscosity silicone resin to be injected into the frame for assisting in transferring heat.

Growing community of inventors

Suwa, Japan

Takashi Asada