Matsushita Electric Industrial Co., Ltd.

Shuichi Watanabe

Noboru Katakabe

Kenji Asakura

Masanori Yoshikawa

Hideki Tatematsu

Masaru Imai

Toshiharu Sasaki

Takehisa Takamiya

Orio Yoshii

Hiroaki Takase

An excitation coil is arranged so as to be opposed to a rotatable heat generating roller of a conductive material, and on a rear side of the excitation coil, a core of a magnetic material is provided. The core is composed of a central core that is formed continuously in a rotation axis direction of the heat generating roller, and a plurality of U-shaped cores arranged at a distance from each other in that direction. A high-frequency current is applied to the excitation coil so that the heat generating roller generates heat by electromagnetic induction. An additional coil is wound around the U-shaped core. Both ends of the additional coil are connected to a switching unit. When the switching unit is brought to a connected state, under an induction current generated in the additional coil, a magnetic flux in a direction in which a magnetic flux of the excitation coil is cancelled out is generated, so that heat generation of the heat generating roller can be suppressed. The switching unit is switched over according to a width of a paper sheet to be passed and a temperature distribution in the rotation axis direction. Thus, a uniform temperature distribution of the heat generating roller in the rotation axis direction can be maintained.

Electromagnetic induction image heating device and image forming apparatus

A thermal copying apparatus disclosed holds an original and a recording sheet in intimate contact with each other between a holding member and a transparent member and operates a light source to irradiate the original through the transparent member thereby to effect a copying operation thermosensitively. The apparatus further has at least one of a heater for heating the transparent member at a portion where the original and the recording sheet are fed into prior to the copying operation, a cooling fan for generating a cooling gas flowing perpendicularly to the conveying direction of the original and the recording sheet and reversing its flowing direction at predetermined cycles, a sensor for detecting temperature of the transparent member, and a circuit for controlling energy of the light source in accordance with the detected temperature, thus being capable of always obtaining uniform copying density.

Thermal copying apparatus

A printing apparatus having a simple construction is constituted by a print element with a plurality of resilient spokes which have type elements disposed vertically thereon and in two rows around the element and extend upwardly from a disc base in a cylinder, and a gear on the disc base integral therewith and coaxial with the disc base and cylinder. The print element is easy to mount and remove. A hammer for pressing each type element on the print element against a printing member and a shaft mechanism for carrying out a shifting operation of the print element are provided. A rotary means includes a motor for rotatably driving the print element and a drive gear connected to the motor. A holder is provided for holding the print element, hammer, and shift mechanism. The print element is preferable mountable and removable with respect to the holder and when mounted, engages the drive gear and is rotatable and vertically movable.

Print element and printing apparatus using same

A solenoid including a plunger supported on a shaft so as to be axially and rotatably moveable, a rotator rotatably supported on the shaft, a coil for generating magnetic flux to attract the plunger to the rotator by a magnetic force, and yokes for completing magnetic circuits such that the plunger and rotator are subjected to no radial force by the magnetic force and no axial force after they are drawn to each other.

Solenoid

A serial printing mechanism which employs a type wheel having a plurality of type characters has a single motor mounted on a carriage employed to accomplish plural functions. The single motor selectively rotates the type wheel to locate the predetermined type character in front of the typing position, and shifts the carriage. The carriage drive which shifts the carriage along a platen is powered by the single motor through a clutch which selectively engages the motor with the carriage drive.

Growing community of inventors

Neyagawa, Japan

Shuichi Watanabe