Sharp Kabushiki Kaisha Corporation

Tatsushi Hayashi

Shoichiro Yoshiura

Ken-ichi Iwamoto

Kozo Takahashi

Eiichi Shimizu

Kenji Okada

Masafumi Okumura

Kouichi Matsumoto

Tamami Handa

Ken Iwamoto

Hiroshi Nakamura

An optical unit including a lens and a mirror unit installed within an image forming apparatus, the lens and mirror unit moving together according to a desired power of magnification so as to expose a photoconductor to the light reflected from the original to form an image corresponding to the desired magnification, wherein the optical unit includes a cam device for moving the mirror unit, the cam device including a cam which is connected to a driving source and rotates according to the various power of magnification, and a cam follower which moves around the cam to reciprocate the mirror unit; and a lock means on the circumferential surface of the cam, the lock means engaging the cam follower to prevent the mirror unit from moving when a specific variable power of magnification is selected.

Optical unit

An image reading apparatus is provided with a transparent plate horizontally disposed on which an image reading operation is performed, and a transporting device disposed above the transparent plate for transporting an original sheet to the transparent plate. The transporting device includes a pressure roller for pressing the original sheet onto an upper surface of the transparent plate at a pressure applying position and transporting the original sheet along the upper surface of the transparent plate. The image reading apparatus is also provided with a light source disposed below the transparent plate for illuminating through the transparent plate a portion of the transported original sheet. The illuminated portion of the original sheet is positioned on the upper surface of the transparent plate at an upstream side of the pressure applying position with respect to a transporting direction of the original sheet. The image reading apparatus is further provided with a detecting device for detecting through the transparent plate a reflection light from the illuminated portion of the original sheet.

Original image transporting and reading apparatus

A lens repositioning device for use in a copying machine which device comprises a generally elongated lens carriage having a lens assembly fixedly mounted thereon; a single traction cable adapted to be driven by a drive unit and including generally intermediate first and second cable portions over the length thereof which extend parallel to each other and are, when the traction cable is driven by the drive unit, moved at the same velocity and in the same direction, and a guide member. The lens carriage is rigidly connected at its opposite ends with the respective first and second portions of the traction cable. The guide member is operable during the movement of the traction cable accompanied by the movement of the lens carriage to guide the lens assembly to follow a curved path of a predetermined configuration.

Lens repositioning device in a copier

A magnification converting mechanism for a variable magnification copying apparatus, which includes a magnification converting lever provided on a control panel, a magnification change-over arm associated with functioning of the magnification converting lever, a lens holder slidably fitted on a sliding shaft and engaged with part of the magnification change-over arm so as to be slid over the sliding shaft following displacement of the arm, and a lens assembly held on the lens holder.

Magnification converting mechanism for a variable magnification copying

A variable magnification apparatus is provided with a magnification converting mechanism and a scan speed change mechanism. In the magnification converting mechanism, the force generated by operating a magnification converting lever is transmitted to the lens holder through a magnification change-over arm and to a speed change selection member through a scan speed change shaft. In the scan speed change mechanism, the number of rotations of an output shaft is changed by a selected rotation transmission member which is actuated by a speed change ratio selection member.

A table start position selecting mechanism for an electrophotographic copying machine of the type with a movable table comprises a unistructural lamp unit with a lamp and a primary mirror for initially reflecting light from a document on the table. A table start position detection switch is attached to a supporting plate which is independent of the lamp unit and adjustable with respect thereto in the direction of motion of the table. A positioning device such as a pin is affixed to the lamp unit at the center of its optical axis such that the switch-supporting plate can be easily and accurately positioned with respect to the lamp unit in the direction of motion of the table.

Growing community of inventors

Nara, Japan

Tatsushi Hayashi