Mita Industrial Co., Ltd.

Isao Yada

Hiroshi Kimura

Yutaka Shigemura

Masahiko Hisajima

Kiyoshi Morimoto

Yoichiro Irie

Takashi Nagashima

Shinobu Satonaka

Seiji Kaminaga

Yasuhiko Yoshikawa

A copying paper feeding device comprises a first and a second paper loading sections to be loaded with a stack of copying paper sheets, a first and a second paper delivery mechanism disposed respectively in the first and second paper loading sections, a first and a second paper introducing passage extending respectively from the first and second paper loading sections and terminating in a common point of junction, a paper conveying passage extending from the point of junction, a first conveyer roller pair disposed in the first paper introducing passage, and a second conveyor roller pair disposed at the point of junction or at an upstream part of the paper conveying passage. In performing a copying process, either the first or second paper delivery mechanism is selectively actuated. The first and the second conveyor roller pairs are interlocked with each other, and adapted to be started after the first or second paper delivery mechanism has been actuated. When the first paper delivery mechanism is selectively actuated, the roller pairs are started earlier by the time required to convey a copying paper from the first conveyor roller pair to the second conveyor roller pair than when the second paper delivery mechanism is actuated. The first conveyor roller pair exerts position-correcting and synchronism-adjusting actions on a copying paper delivered from the first paper loading section, and the second conveyor roller pair exerts position-correcting and synchronism-adjusting actions on a copying paper delivered from the second paper loading section.

Paper feeding device and a paper guiding device in a copying apparatus

An electrostatic copying apparatus having a semiautomatic document supplying and discharging device and a sorter in addition to its main body. The main body of the apparatus comprises a rotatable photosensitive member, means for forming a latent electrostatic image on the photosensitive member, developing means, transfer means, means for conveying a copying paper, cleaning means and a heat fixing device. Various improvements have been made in the manner of controlling cleaning, the manner of controlling the delivery of a copying paper, the manner of controlling troubleshooting and display, the manner of controlling interrupting copying, the manner of controlling heating, the manner of distribution electric power, etc.

Electrostatic copying apparatus

An electrostatic copying apparatus having a semiautomatic document supplying and discharging device and a sorter in addition to its main body. The main body of the apparatus includes a rotatable photosensitive member, a device for forming a latent electrostatic image on the photosensitive member, a developer, a transfer device, a device for conveying a copying paper, a cleaner and a heat fixing device. Various improvements have been made in the manner of controlling cleaning, the manner of controlling the delivery of a copying paper, the manner of controlling troubleshooting and display, the manner of controlling interrupting copying, the manner of controlling heating, the manner of distribution electric power, etc. The heating is controlled by a parallel network of linear circuits including a temperature detector and a multi-element voltage dividing circuit, the elements of which can be switched into and out of operation to alter the sensed temperature to which the network responds.

Temperature detector

An electrostatic copying apparatus having a semiautomatic document supplying and discharging device and a sorter in addition to its main body. The main body of the apparatus includes a rotatable photosensitive member, a device for forming a latent electrostatic image on the photosensitive member, a developer, a transfer device, a device for conveying a copying paper, a cleaner and a heat fixing device. Various improvements have been made in the manner of controlling cleaning, the manner of controlling the delivery of a copying paper, the manner of controlling troubleshooting and display, the manner of controlling interrupting copying, the manner of controlling heating, the manner of distribution electric power, etc. A heat fixing device includes an electrical heater having a heat controller for controlling energization and deenergization of the heater on the basis of detected temperature. An electrical power saving unit has a manually operable power saving switch which produces a power saving signal to which the heat controller is partially responsive.

An electrostatic copying apparatus having a semiautomatic document supplying and discharging device and a sorter, in addition to its main body. The main body of the apparatus includes a rotatable photosensitive member, means for forming a latent electrostatic image on the photosensitive member, a developer, a transfer unit, a conveying unit for conveying a copying paper, a cleaner and a heat fixing device. Various improvements have been made in the manner of controlling cleaning, the manner of controlling the delivery of a copying paper, the manner of controlling troubleshooting and display, the manner of controlling interrupting of copying, the manner of controlling heating, and the manner of distributing electric power.

A paper guiding device in a copying apparatus includes, in opposition, a lower guide plate having a main flat portion and an upper guide plate having a main flat portion. A plurality of rising pieces, having top edges and being laterally spaced apart upon the upper side of the main flat portion of the lower guide plate, rise above the lower guide plate and extend in the direction of movement of the copying paper. A plurality of hanging pieces, having lower edges and are laterally spaced apart on the lower side of the main flat portion of the lower guide plate, hang from the upper guide plate and extend in the direction of movement of the copying paper. The top edges and the lower edges define a path of movement of the copying paper while having minimal contact with the paper. A plurality of openings through the upper guide plate and an opening through each of the hanging pieces dissipate heat from the copying paper to substantially prevent the accumulation of moisture on the copying paper and in the improved paper guiding device.

Paper guiding device in a copying apparatus

A copying apparatus includes a sorter which is arranged to sort a plurality of copy paper sheets corresponding to a single original document, discharged from a main body of the copying apparatus, into a plurality of bins successively shifted to a paper discharge position by a shifting device. The copying apparatus includes a copy number preset key, a memory for memorizing a preset number of copies, a first counter for counting the number of copied paper sheets, a second counter for counting the number of discharged copy paper sheets, a device for stopping the copying operation when the counted value of the first counter agrees with the memorized preset number of copies, and a sort key for selecting a mode for sorting the copy paper sheets into the bins one sheet in each bin. An electrical circuit applies signals to the shifting device in order to change the moving direction of the bins when the counted value of the second counter agrees with the memorized preset number of copies in the sort mode.

Copying apparatus having a copy sheet sorter

An electrostatic copying method of the transfer type which comprises repeatedly performing a copying cycle including an image-forming step of forming a latent electrostatic image on a photosensitive material moved through an endless moving path or a toner image obtained by developing it, a transfer step of transferring the latent electrostatic image or the toner image on the photosensitive material to a receptor member subsequent to the image-forming step, and a cleaning step of cleaning the photosensitive material subsequent to the transfer step. When the width or length of a receptor member to be used in the next copying cycle is found to be larger than the width or length of a receptor member used in the preceding copying cycle as a result of comparison of at least one of the width and length of the receptor member to be used in the next copying cycle respectively with at least one of the width and length of the receptor member used in the preceding copying cycle, the above cleaning step is additionally performed after the end of the preceding copying cycle before the next copying cycle is started.

Transfer-type electrostatic copying method

A detecting device for detecting when the amount of toner in a dual component developing material is less than a predetermined level includes a hopper for supplying the toner, a stirring roller for stirring a carrier and the toner from the hopper, and a detector for detecting the amount of developing material provided near the stirring roller to mix the toner supplied from the hopper with the carrier. A discriminator discriminates an output signal from the detector for a predetermined interval during the rotational period of the stirring roller. An indicating element operates in response to the output signal from the discriminator to indicate when the amount of the toner in the developing material is less than the predetermined level. Since it is indicated when the toner in the developing material is less than the predetermined level, the toner is supplied according to such indication, and therefore, an undesirable deterioration of copy density is prevented.

Dual component developing material detecting device for electrostatic

The present invention relates to a developing material supplying control device for an electrostatic copying apparatus which includes an oscillator circuit composed of an oscillation coil provided along a toner supplying passage, a timer, a counter for counting the output signal from the oscillation circuit at every interval predetermined by the timer to supply a discriminating output signal when the counted value is equal to a predetermined value for each of the intervals. A toner supply acts in response to the discriminating output signal from the counter for supplying toner to the toner supplying passage. Since this invention employs the oscillation coil and does not employ a mechanical switch having a movable contact for detecting toner in the toner supplying passage, the toner supplying operation is achieved precisely.

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Neyagawa, Japan

Isao Yada