Patent application number | Description | Published |
20080218577 | CONVEYOR BELT WITH LINEAR SCALE, CONVEYOR BELT DRIVING APPARATUS AND PRINTING APPARATUS - A printing apparatus for printing characters, figures, or images by ejecting fine liquid from a plurality of nozzles to form fine particles on a print medium. The printing apparatus includes: a conveyor-belt driving system in which a conveyor belt with a linear scale is used, the conveyor belt having a magnetic layer including a magnetic pattern serving as a linear scale on the inner circumference of the conveyor belt along the direction of conveyance of the print medium; scale-pattern detection unit that detects the scale pattern of the linear scale on the conveyor belt; print-timing determination unit that determines the timing to print on the print medium according to the scale pattern detected by the scale-pattern detection unit; and printing unit that prints on the print medium at the print timing determined by the print-timing determination unit. | 09-11-2008 |
20080231648 | PRINTER - A printer includes a first transporting belt that transports a print medium and a second transporting belt that receives the print medium from the first transporting belt and further transports the print medium. A liquid ejection head ejects liquid according to a liquid-ejection timing signal to the print medium transported by the first transporting belt and the second transporting belt. A signal generator outputs the liquid-ejection timing signal according to a first signal and a second signal that correspond to the travel of the first and second transporting belts, respectively. When the phase difference between the first and second signals has a predetermined threshold value or less, the signal generator switches from outputting the liquid-ejection timing signal according to the first signal to outputting the liquid-ejection timing signal according to the second signal. | 09-25-2008 |
20090058900 | PULSE GENERATION APPARATUS, IMAGE FORMATION APPARATUS, AND PULSE GENERATION METHOD - A pulse generation apparatus has an encoder that outputs an encoder signal in a cycle corresponding to each driven operation of a driving target medium by a drive amount per unit. The pulse generation apparatus generates a pulse on the basis of the encoder signal that is outputted by the encoder. The amplitude of the signal changes in a cyclic manner. The pulse generation apparatus has a switching unit that receives the encoder signal and then switches either the amplitude of the signal or a threshold depending on the driven speed of the driving target medium so as to change the number of signal waves that exceed the threshold depending on the driven speed of the driving target medium. The pulse generation apparatus also has a pulse generating unit that generates a pulse having the same cycle as that of the signal wave that exceeds the threshold. | 03-05-2009 |
20090079999 | IMAGE FORMING APPARATUS AND PULSE GENERATING METHOD - An image forming apparatus records an image on a transported recording medium. The apparatus includes a transportation unit that transports the recording medium and a recording unit that records the image on the recording medium. An encoder outputs an encoder signal including pulses according to a position of the transportation unit. A measurement unit measures a pulse period of the encoder signal, and the measured pulse period is stored by a storage unit. A detection unit detects pulse omission of the encoder signal on the basis of the value measured by the measurement unit. A pulse generation unit generates a recording timing pulse on the basis of the pulse period when the pulse omission is not detected and generates the recording timing pulse on the basis of the pulse period stored in the storage unit and measured before the pulse omission when the pulse omission is detected. | 03-26-2009 |
20090097081 | DETECTING APPARATUS AND RECORDING UNIT - A detecting apparatus includes a target section in which target elements to be detected are arranged in the direction of the motion of a moving body; a detecting section that detects the target elements with the motion of the moving body and outputs a waveform signal having an output level corresponding to its detection sensitivity; a first-digital-signal output section that binarizes the waveform signal with reference to a first threshold to output a first digital signal; a second-digital-signal output section that binarizes the waveform signal with reference to a second threshold which is higher in absolute value than the first threshold to output a second digital signal; and a determining section that determines whether the second digital signal has changed in status. | 04-16-2009 |
20090219373 | BELT TRANSPORT DEVICE AND BELT TRANSPORT CONTROL METHOD - A belt transport device includes: a drive roller which is driven by a power source; a driven roller which is held in a rotatable manner; an endless belt which is wound on the drive roller and the driven roller; a band-like detecting section which is arranged on the endless belt in a circumferential direction of the endless belt; a sensor which detects the band-like detecting section; a displacement unit which displaces a relative positional relationship between the band-like detecting section and the sensor in a width direction of the endless belt. | 09-03-2009 |
20090256613 | PULSE SIGNAL GENERATING DEVICE, TRANSPORT DEVICE, IMAGE FORMING APPARATUS, AND PULSE GENERATING METHOD - A pulse signal generating device includes: an encoder that outputs a pulse with a period corresponding to the speed of an object to be detected; a measurement unit that measures a period of the pulse; a storage unit that stores the measured period; an operation unit that calculates a reasonable period, which is estimated to be statistically reasonable, on the basis of a result of period measurement of a plurality of pulses; a detection unit that detects period abnormalities when the measured period of the measurement unit satisfies a period abnormality condition specified from the reasonable period; and a pulse generating unit that generates a pulse on the basis of the measured period when the period abnormalities are not detected and generates a pulse on the basis of the reasonable period when the period abnormalities are detected. | 10-15-2009 |
20090256615 | PULSE SIGNAL GENERATING DEVICE, TRANSPORT DEVICE, IMAGE FORMING APPARATUS, AND PULSE GENERATING METHOD - A pulse signal generating device includes: the plurality of encoders each of which outputs an encoder signal with a pulse period corresponding to the speed of an object to be detected; delay amount control unit that controls a relative delay amount with respect to a pulse signal for each of the plurality of pulse output signals output from the plurality of encoders; a detection unit that individually detects abnormalities in pulses of the plurality of encoder signals; a switching unit that performs switching to one pulse output signal, in which pulse abnormalities are not detected, of the plurality of pulse output signals; and a pulse generating unit that generates a pulse signal by delaying the one pulse output signal switched by the switching unit by the corresponding relative delay amount. | 10-15-2009 |
20090289980 | LIQUID JET APPARATUS, PRINTING APPARATUS, AND METHOD OF ADJUSTING PHASE OF DRIVE PULSE - A liquid jet apparatus including a plurality of nozzles provided to a liquid jet head, an actuator corresponding to each of the nozzles, and drive unit that applies a drive pulse to each of the actuators, wherein the drive unit includes correction value storing unit that stores a drive pulse application timing correction value corresponding to the number of actuators to be driven at the same time, and drive pulse application timing correction unit that corrects the drive pulse application timing using the drive pulse application timing correction value stored in the correction value storing unit. | 11-26-2009 |
20090303271 | HEAD DRIVE DEVICE AND DRIVE CONTROL METHOD OF INK JET PRINTER, AND INK JET PRINTER - A head drive apparatus of an ink jet printer having: a plurality of nozzles for jetting liquid drops that are provided for an ink jet head; a plurality of actuators provided in correspondence to the nozzles; and a drive unit that applies a drive signal to the actuators, wherein the drive unit comprising: a drive waveform generator that generates a drive waveform signal being standard of a signal to control drive of the actuators; a modulator that modulates a pulse of a drive waveform signal generated by the drive waveform generator; a digital power amplifier for amplifying power of a modulated signal subjected to the pulse modulation by the modulator; and a low pass filter for smoothing an amplified digital signal subjected to the power amplification by the digital power amplifier and supplying the signal as a drive signal to the actuators. | 12-10-2009 |
20100079525 | REFERENCE MARK FORMING DEVICE AND RECORDING APPARATUS PROVIDED WITH THE REFERENCE MARK FORMING DEVICE - A reference mark forming device configured to form reference marks on a recorded material to be transported in a predetermined transporting direction by a transporting device at a predetermined regular pitch in the transporting direction including: a reference-mark-specific head configured to form the reference marks on the recorded material transported by the transporting device; a mark detection sensor configured to detect the reference marks formed on the recorded material by the reference-mark-specific head on the downstream side of the reference-mark-specific head in terms of the transporting direction; and a head drive unit configured to drive the reference-mark-specific head on the basis of an output signal from the mark detection sensor, in which the reference-mark-specific head and the mark detection sensor are arranged so that the relative positional relation is maintained constant. | 04-01-2010 |
20100220133 | HEAD DRIVE APPARATUS OF INKJET PRINTER AND INKJET PRINTER - A head drive device of an inkjet printer having a nozzles and corresponding actuators that jet liquid drops. A drive section applies a drive signal to the actuators. The head drive device includes a drive waveform generating section that generates a drive waveform signal which is used as a reference of a signal to control drive of the actuators. A modulating section modulates a pulse of a drive waveform signal generated by the drive waveform generating section. A digital power amplifier amplifies power of a modulated signal subjected to the pulse modulation. A low pass filter smoothes a power-amplified modulated signal subjected to the power amplification by the digital power amplifier and supplies the signal as a drive signal to the actuators. A frequency characteristics adjusting section adjusts frequency characteristics of the low pass filter as a function of the number of the actuators. | 09-02-2010 |
20110011705 | BELT TRANSPORT DEVICE AND BELT TRANSPORT CONTROL METHOD - A belt transport device includes: a drive roller which is driven by a power source; a driven roller which is held in a rotatable manner; an endless belt which is wound on the drive roller and the driven roller; a band-like detecting section which is arranged on the endless belt in a circumferential direction of the endless belt; a sensor which detects the band-like detecting section; a displacement unit which displaces a relative positional relationship between the band-like detecting section and the sensor in a width direction of the endless belt. | 01-20-2011 |
20110081187 | PRINTING DEVICE AND METHOD OF CONTROLLING PRINTING DEVICE - Provided is a printing device including: a transport unit configured to transport a sheet-shape printing medium; a printing unit configured to print an image on the printing medium transported by the transport unit; a shape detection unit configured to detect the shape of edges of the printing medium; a position detection unit configured to detect the positions of the edges when an image is printed on the printing medium by the printing unit; and a first determination unit configured to determine the attitude of the printing medium based on the shape of the edges detected by the shape detection unit and the positions of the edges detected by the position detection unit, | 04-07-2011 |
20120092401 | HEAD DRIVE DEVICE OF INKJET PRINTER AND INKJET PRINTER - A head drive of an inkjet printer includes nozzles and corresponding actuators that eject liquid ink drops. A drive unit applies a drive signal to the actuators. The drive unit includes a drive waveform generator that generates a drive waveform signal to control the drive of the actuators. A modulator pulse modulates the drive waveform. A digital power amplifier amplifies power of the modulated signal. A low pass filter smoothes the amplified digital signal and supplies the signal as a drive signal to the actuators. An inverse filter provided in a subsequent stage of the drive waveform generator corrects at least the frequency characteristics of the filter to predetermined frequency characteristics, independent of the number of the actuators to drive. | 04-19-2012 |