Tohoku Ricoh Co., Ltd. Patent applications |
Patent application number | Title | Published |
20120236614 | HIGH VOLTAGE INVERTER DEVICE - A high voltage inverter device uses, as an input voltage (Vin), a DC voltage or a voltage composed of a DC component with a pulsating current superposed thereon, switches the input voltage by a switching element (Qsw) to apply an exciting current to an excitation winding (NP) of a resonant transformer ( | 09-20-2012 |
20120163058 | HIGH VOLTAGE INVERTER DEVICE AND ELECTRICAL LEAKAGE DETECTOR THEREOF - In a high voltage inverter device switching an input voltage to apply an exciting current to an excitation winding of a transformer and output an alternating-current high voltage from an output winding to supply the high voltage to a load from output lines, a point on the output line is connected to a frame ground. Each of a first and a second winding of the electrical leakage detecting transformer is interposed in series with the output line on a side where current flows out of the point and a side where current flows into the point respectively. A detection voltage Vd outputted from an amplifying winding is compared by a comparison voltage Vref, and an electrical leakage detection signal Sd is outputted when Vd>Vref. The first and second winding are opposite in winding direction to each other and equal in number of turns. | 06-28-2012 |
20110235382 | HIGH VOLTAGE INVERTER DEVICE - The high voltage inverter device receives, as an input voltage, a DC voltage or a voltage within Safety Extra Low Voltage composed of a DC component with a pulsating flow superposed thereon. The input voltage is switched by a switching element to pass an exciting current to excitation windings on a primary side of a plurality of separate transformers having same characteristics to simultaneously excite the excitation windings. Output windings of the plurality of transformers are connected in parallel or in series with one another, and time axes of waveforms of output voltages of the output windings are synchronized. Thereby, a high-power high voltage is outputted continuously, stably, and safely from both ends of the output windings connected in parallel or in series. | 09-29-2011 |
20090290007 | INKJET RECORDING METHOD AND INKJET RECORDING APPARATUS - An inkjet recording method including: (i) exposing a surface of a recording medium to non-thermal atmospheric pressure plasma so as to hydrophilize the surface of the recording medium, and (ii) applying a stimulus to an ink composition so as to eject the ink composition to form an image on the recording medium, wherein the ink composition contains at least one of a pigment/water-dispersible resin particle mixture in which a pigment is dispersed along with water-dispersible resin particles and colored water-dispersible resin particles each of which is a water-dispersible resin particle which is colored. | 11-26-2009 |
20090284560 | INKJET PRINTING APPARATUS - An inkjet printing apparatus that can perform printing with a single printing speed even in a case of being connected with a post-processing apparatus having a different transport speed, and that can suppress increased apparatus costs. A discharge transport portion positioned at a connection side of a post-processing apparatus of the inkjet printing apparatus is constituted by transport roller pairs and discharge roller pairs, and is capable of being driven independently from the inkjet transport portion. When the transport speed of the post-processing apparatus is different from the printing speed, printed papers are temporarily stopped at the discharge transport portion. After this, transport recommences with a predetermined timing matched to the transport speed of the post-processing apparatus, and papers are fed to the post-processing apparatus. In a case of continuous printing, a distance between the papers (paper feeding interval) is adjusted in the inkjet printing apparatus to enable transport jams to be avoided. | 11-19-2009 |
20090283958 | SHEET FEEDING DEVICE AND IMAGE-FORMING APPARATUS - An image-forming apparatus and sheet feeding device capable of feeding sheets without skewing or multi-feeding of sheets using a small number of side air blowing drive sources. The sheet feeding device has a plurality of side discharge nozzles comprising side discharge outlets for blowing air onto the respective side edge surfaces of a paper stack, and two sirocco fans which are communicatively connected in series as a side air blowing drive source, and are communicatively connected, via a side discharge drive source chamber and a side discharge relay tube (duct), to the plurality of side discharge nozzles. The respective side discharge nozzles capable of moving in linkage with side fences, and an immovable fixed side discharge nozzle are disposed at different distances from the leading edge of the loaded and set paper stack with respect to a sheet feeding direction. | 11-19-2009 |
20090211470 | STENCIL PRINTING APPARATUS - A stencil printing apparatus which is capable of reducing difficult cleaning work even when two-sided printing is performed continuously and is capable of improving printing efficiency comprises a printing portion, a paper discharge portion, paper re-feeding means for re-feeding paper to the printing portion, and a displaceable switching member which selectively occupies a first position in which the paper that has passed through the printing portion is guided to the paper discharge portion and a second position in which the paper is guided to the paper re-feeding means. A reverse side printing step is performed in which the paper is re-fed to the printing portion by the paper re-feeding means after a surface printing step is performed, and the switching member comprises, on a face thereof opposite the paper when the switching member occupies the first position, a contact area reduction member for reducing the area of contact with the paper. | 08-27-2009 |
20090140487 | OPTION-TYPE PAPER FEEDING DEVICE - The invention provides an option-type paper feeding device that can contribute to enhancing printing operation efficiency while taking advantage of variable printing speed in a printing apparatus. A high-volume paper feeding device includes: a paper stacking section; a paper feeding mechanism; and an intermediate transport section connected to a paper feeding section of a printing apparatus such as a stencil printing apparatus. The intermediate transport section includes: a first paper transport means; and a second paper transport means provided downstream of the first paper transport means, and an inkjet printing section is provided above the first paper transport means. The transport speed of the first paper transport means is fixed to a speed suitable for printing by the inkjet printing section, while the transport speed of the second paper transport means is variable. The transport speed of the second paper transport means is adjusted by control means (not shown in drawings) in accordance with the printing speed of a printing apparatus connected to the high-volume paper feeding device. | 06-04-2009 |
20090126585 | STENCIL PRINTING APPARATUS - A stencil printing apparatus for wrapping a master around an outer circumferential surface of a plate cylinder to perform printing, the stencil printing apparatus being capable of preventing the occurrence of abnormal images or afterimage phenomenon which causes confidential information leakage, without increasing cost or causing any problems. This stencil printing apparatus has time measuring means for measuring a leaving time during which the apparatus is left stand, and when a plate discharge command is output before the leaving time exceeds a first predetermined time while the master is wrapped around the outer circumferential surface, the stencil printing apparatus is shifted to a standby state after the master is discharged from the outer circumferential surface. | 05-21-2009 |
20090025580 | COATING DEVICE AND COATING UNIT IN A STENCIL PRINTING APPARATUS - The invention discloses a varnish coating device that utilizes an ordinary conventional digital stencil printing apparatus, such that anyone can easily apply a uniform film of a viscous coating onto a predetermined area of, for instance, covers and surfaces of printed products. The invention functions as a varnish coating device, in place of a drum unit, when a varnish coating unit is mounted on a mounting section of a printing apparatus main body. The varnish coating unit has: a coating roller that coats the surface of printed paper with a transparent varnish liquid and feeds out the paper; a supply device having a doctor roller that forms a liquid pool on the coating roller and that supplies varnish liquid to from a coating in a predetermined thickness over a predetermined area of the surface of the coating roller; a cradle that detachably supports a varnish container; and a pumping device. | 01-29-2009 |
20090013901 | ACTIVE ENERGY BEAM-CURABLE INK - Provided is an active energy beam-curable ink capable of preventing ink flow by enhancing the separation resistance of the ink components at high temperatures without impairing the stability against viscosity changes due to high temperatures. The active energy beam-curable ink contains hydrophilic silica with a primary particle diameter of 100 nm or less. It is preferable that a specific surface of the hydrophilic silica be 280 m | 01-15-2009 |
20080307985 | STENCIL PRINTING APPARATUS ALLOWING DOUBLE-SIDE PRINTING - A stencil printing apparatus allowing double-side printing able to suppress the drop in work efficiency caused by the occurrence of through-jam during a double-side printing operation, which includes: a printing portion having a plate cylinder and pressing means; a paper discharging portion, paper refeeding means for temporarily housing and then refeeding paper sheets on which an image has been formed on one side to the paper discharging portion; and switching means for guiding the paper sheets to either the paper discharging portion or paper refeeding means, and which performs a front-side printing step in which a front-side image is printed on one side of a paper sheet, and a rear-side printing step in which this paper sheet is fed to paper refeeding means, and refed from paper refeeding means to the printing portion, and then a rear-side image is printed on the other side of the paper sheet. | 12-18-2008 |
20080302259 | STENCIL PRINTING APPARATUS - A stencil printing apparatus with a plate-making device has first control means for executing a special plate-making mode for performing a plate-making operation so that perforated holes to be formed in a film of a master by heating and driving with regard to odd bits corresponding to odd-numbered heat generators and even bits corresponding to even-numbered heat generators are formed in different lines running in the main scanning direction, and so that the perforated holes to be formed on the film by heating and driving with regard to the odd bits and the even bits adjacent to each other are not arranged adjacent to each other in the same line in the main scanning direction. | 12-11-2008 |
20080216680 | STENCIL PRINTING APPARATUS - A stencil printing apparatus in which the generation of discharge sheet peeling problems and defects such as creasing and tear of the stencil base sheet can be prevented while printing on a coated sheet. When a printing sheet set in a sheet-feed device is indicated by input via a sheet-type input device as a coated sheet, or when a printing sheet set in a sheet-feed device is automatically detected by a sheet-type detection device as a coated sheet, a control device judges on the basis of a detected signal from the base-sheet type detection device whether or not the stencil base sheet type set in the platemaking apparatus is for coated sheet printing, and permits platemaking start if the stencil base sheet is for coated sheet printing and issues a warning without permitting platemaking start if the stencil base sheet is for non-coated sheet printing. | 09-11-2008 |