Canon Kabushiki Kaisha

Katsushi Furuichi

Toshio Honma

Katsumi Murakami

Hisashi Sakamaki

Yoshikazu Yokomizo

Yoshimasa Kimura

Kazuo Kawakubo

Tadashi Sato

Katsuichi Shimizu

Tsuneki Inuzuka

Tomohiro Aoki

Masahiro Tomosada

Toshirou Kasamura

Naomi Takahata

Hidetoshi Tanaka

Osamu Sawamura

Kiyokazu Namekata

Yujiro Ando

Shunichi Masuda

Yutaka Komiya

Kenji Kurita

Yoshikuni Tohyama

Yoshitomo Goshima

Shuji Murakawa

Masharu Ohkubo

Yashikuni Tohyama

Yoshikazu Yokohmizo

An image forming apparatus includes a device for setting the apparatus in a check mode to check a state of the apparatus and for selectively executing one of a plurality of check operations. In one aspect, each check operation is set using a commonly provided numeral key, and the check mode is unconditionally released using a clear key. In another aspect, one of the check modes includes a test movement of a movable member used in image formation. In still other aspects, sheet transporting operations are controlled based on the location of a sheet jam, or based on the selection of a sheet sorter. The state of each of the image formation devices is checked even if an improper state has already been detected, plural error states are repeatedly displayed in a specific order, and a display unit is commonly used.

Image forming apparatus having error detection with automatic error

An image forming apparatus includes a device for setting the apparatus in a check mode to check a state of the apparatus and for selectively executing one of a plurality of check operations. In one aspect, each check operation is set using a commonly provided numeral key, and the check mode is unconditionally released using a clear key. In another aspect, one of the check modes includes a test movement of a movable member used in image formation. In still other aspects, sheet transporting operations are controlled based on the location of a sheet jam, or based on the selection of a sheet sorter. In still other aspects, the state of each of the image formation devices is checked even if an improper state has already been detected, plural error states are repeatedly displayed in a specific order, and a display unit is commonly used for a variety of purposes.

Image forming apparatus having feeding error detection and feeding error

An image forming apparatus includes an image forming mechanism, an input device for setting image formation data necessary to command desired image formation, first and second displays for displaying the data input through the input device and for indicating that the apparatus is ready to form images, respectively, a starter for commanding image formation to commence, a timer, and a controller. The timer controls the first display to return the image formation data to predetermined values if the starter has not been actuated during a predetermined time interval. The controller controls the image forming mechanism to form an image according to the displayed data if the starter is actuated after the ready indication, controls the input device to allow the input of data even before the ready indication in which case the timer begins to time after the ready indication, and controls the timer to reset if new image formation data is input during the predetermined time.

Image forming apparatus having display device for displaying

A double-sided image forming apparatus having first and second input devices respectively for entering function data for desired image formation functions and for entering the number of copies to be formed. A memory is provided to store the function data, and a storage compartment is provided to store sheets during duplex copying. An image forming device is arranged to operate in two procedures: a first procedure in which image formation is effected on the sheet's first side in accordance with first function data, and a second procedure in which image formation is effected on the other side in accordance with a second, different, function data. A controller controls the image forming device so that entry of number data and function data is permitted before the first procedure begins, but so that entry of only function data and not number data is permitted after completion of the first procedure. A detecting device is provided to detect the presence of sheets in the storage compartment, and the controller operates until sheets are no longer detected.

Double-side image forming apparatus

A diagnostic program determines whether the machine is in a proper or improper operational state, and the scanning device is moved to a predetermined position in response to the positioning program after the entry of the key inputs by the entry program, and a copying operation is then enabled. The key entry program is executed after the machine starts, and the positioning program is executed before the start of the scanning device and after the key input entry, wherein the scan is inhibited from exposing the recording medium when the diagnostic program determines that the state of the machine is improper, or when the positioning program determines that the scanning device is not in the predetermined position. Also, the scan is enabled for exposing the recording medium when the diagnostic program determines that the state of the machine is proper and the positioning program determines that the scanning device is in the predetermined position.

Apparatus for controlling image formation

A high-speed compact sheet handling device is disclosed. In this device sheet members are supplied from a stacking table to a required position and are ejected at a higher speed from that position to the stacking table, and the functions of supply and ejection can be effected at the same time.

Sheet handling device

An automatic original handling apparatus provided with an original supporting mechanism for supporting an original thereon and a mechanism for determining image forming conditions for said original and adapted for performing an image forming operation on said original according to thus determined image forming conditions, said apparatus featured in being capable of interrupting the image forming operation on said original and performing an image forming operation on an another original.

Automatic original handling apparatus

The invention provides a paper feed control device having paper feed rollers for feeding a paper sheet such as an original to a predetermined position, a first sensor for detecting the paper sheet, a second sensor for detecting leading and trailing ends of the paper sheet, a microcomputer for controlling the rollers in response to the outputs signals from the sensors, and a compensating circuit for compensating the level of the output signal from the second sensor which is maintained in a non-detecting state until the paper sheet completely passes through the second sensor. Therefore, even if punched holes for filing are formed on the paper sheet, the punched hole may not be detected as the trailing end of the paper sheet, resulting in proper feeding.

Paper feed control device

A variable magnification copying machine comprises original size input means for inputting a size of an original, a paper size input means for inputting a size of a copy paper and a copy magnification calculation means for calculating a copy magnification factor based on the original size and the paper size. The copy magnification factor is calculated selectively based on widths in one direction of the original and the paper or based on widths in the other direction of the original and the paper.

Variable magnification copying machine

An image forming apparatus includes a process input device for setting various data for image formation, process unit for making images on a recording medium repeatedly in accordance with the data set by the input device, detection devices for detecting a trouble of the process unit, a control unit for selectively controlling the detecting operations of the detection devices, and circuitry for preventing the image forming operation in response to the detection of a trouble by the detection devices. In the apparatus, diagnosis is executed for objects to which it is necessary and the image forming process is controlled by the outcome of the diagnosis.

Image forming apparatus

A paper leaf handling apparatus has a receiving unit for receiving paper leaves, distributor for distributing to the receiving unit the paper leaves having images formed thereon and conveyed from an image formation apparatus to the paper leaf handling apparatus, detector for detecting the connected condition of the paper leaf handling apparatus and the image formation apparatus, and warner for warning of any improper connection detected by the detector.

Paper leaf handling apparatus

A double-side image forming apparatus has input unit for entering the number of desired image formation for forming images on both faces of a sheet-shaped image bearing member and a storage section for storing said image bearing member after image formation on a first face thereof. The apparatus is adapted, when the image formation on the first face of said image bearing members is interrupted before the completion of said desired number of image formations, to conduct in continuation the image formation on the second face of the image bearing members stored in said storage section.

A copying apparatus with a detachable sorter capable of detecting the receiving capacity of the sorter and controlling the function or display of the apparatus accordingly. Also the data concerning the sorter bins are manually set on the apparatus for controlling the function or display of the apparatus accordingly.

Copying apparatus with detachable sorter

A copying or printing machine includes processing units operative for reproducing a copy of an original, a read-only memory having program sequences stored which are composed of coded steps necessary for accomplishing printing or copying cycles, and a random-access memory in which a set of coded signals may be written in and read out. The processing units are actuated in response to coded signals in accordance with the program sequences.

A copying apparatus comprises a recording medium, process means for forming an image on the recording medium including image transfer means for transferring the image formed on the recording medium to a transfer medium, feed means for feeding the transfer medium to an image transfer station, memory means for storing the operating time of the feed means so that the leading end of the image on the recording medium and the leading end of the transfer medium are brought into a predetermined relationship, and control means responsive to the output of the memory means to control the time whereat the feed means operates.

Growing community of inventors

Yokohama, Japan

Katsushi Furuichi