Abstract: A laser printer having a rotating mirror (116) and a heat fuser (220) is operated with a sequence of standby conditions. At the end of a print job mirror (116) is continued to be rotated at printing speed while the temperature of fuser (220) is reduced somewhat. This is maintained for a short time, after which the speed of rotation of mirror (116) is reduced significantly and the fuser (220) temperature is reduced significantly. This is maintained for a time, after which the mirror is no longer rotated (or, if practical, is rotated very slowly) and the fuser temperature is further reduced. At any time when a subsequent print job is received, the mirror and fuser are brought to printing state and the period of times are next started from a beginning state.

Abstract: Toner hopper (1) of a printer (70) has a stirring paddle (3) with an encoder wheel (30, 50) mounted on paddle shaft (5). The drive connection to paddle (3) is through a torsion spring (60). Data processing apparatus determines paddle acceleration or deceleration (90, 94, 98, 102) and executes a table look-up to determine scaled amounts of subsequent movement (92, 96, 100, 104). Steady state movement is a unitary (unscaled) amount (106). These amounts are totaled (93) and used to define yield at the torsion spring, which corresponds to amount of toner in the hopper. This eliminates hardware in previous embodiments at the drive motor to signal actual rotation of the drive motor.

Abstract: Before warm-up of a printer, sheets are initially fed for printing based on a normal assumed lock time for rotation of polygonal mirror (116) of a laser printhead (100). After an initial printing when in a mode in which the printer is warmed, such as a standby mode, sheets are fed for printing based on a lock time shorter than the normal lock time. When a lock time failure is observed when using the shorter lock time, use of the longer lock time is resumed. Time to begin printing is improved by the use of the shorter lock time.

Abstract: Printer (10) has a standby state in which the motor driving the laser scanning mirror (116) is turned off immediately after a print job when another page is not ready. To increase operating speed, a signal to the printer starts a timer (Ready timer). When a page is printed, the timer is started (308) and only when it reaches zero is the motor turned off (306). When data of a page is received by the printer and the Ready timer is non-zero (322), a sheet is immediately picked for printing (326).

Abstract: Before warm-up of a printer, sheets are initially fed for printing based on a normal assumed lock time for rotation of polygonal mirror (116) of a laser printhead (100). After an initial printing when in a mode in which the printer is warmed, such as a standby mode, sheets are fed for printing based on a lock time shorter than the normal lock time. When a lock time failure is observed when using the shorter lock time, use of the longer lock time is resumed. Time to begin printing is improved by the use of the shorter lock time.

Abstract: A substrate sensing mechanism is provided for use in a printer output bin. The sensing mechanism includes a flag having a shape such that when one or more substrates, which have been removed from the bin, are manually reinserted into the bin, the one or more substrates are directed beneath the flag without causing a substrate feed failure. The flag is also positioned and shaped so as to move to a full bin position when a portion of one or more curled substrates extends to or above a level of the substrate output path immediately adjacent the bin entrance.

Abstract: Method and apparatus for controlling a sheet feeder assembly for an imaging apparatus, the sheet feeder assembly including a motor coupled to a gear train for applying a rotational force to a sheet picker roller, a media supply tray for holding a media stack having a plurality of media sheets, and a buckler for buckling a top sheet of print media to separate the top sheet from the media stack, the method including the steps of driving the sheet picker roller at a initial velocity until a backlash of the gear train is eliminated and/or the top sheet has been buckled; and thereafter, accelerating the sheet picker roller from the initial velocity to a target velocity using selectable sheet picker roller velocity profiles.

Abstract: Wear of the belt (1) of a belt fuser is minimized by use of a high viscosity lubricant of perfluoropolytrimethylene oxide grease between the inside of the belt and the heater element 6. To avoid damage of the belt at turn on, the belt is heated to a predetermined temperature before force is applied to move the belt.

Abstract: A method of controlling a speed of a print medium through a printer includes the step of providing a print medium transport assembly with a range of print medium transport speeds between a minimum print medium transport speed and a maximum print medium transport speed. A print engine is provided with a print engine speed. The range of print medium transport speeds is divided into subranges of print medium transport speeds. A requested speed is provided to the print medium transport assembly which corresponds to the print engine speed. For each subrange, an acceleration profile control equation, a constant speed control equation, and a deceleration profile control equation is determined. The constant speed control equation is dependent upon the requested speed. One of the subranges of print medium transport speeds is identified which encompasses the requested speed.

Abstract: Each sheet is picked from a stack of sheets with the time of it being picked being determined in accordance with the time of the prior pick. The sum of the times to advance a sheet its length and a desired gap between adjacent sheets is equal to a pick delay time and an expected feed time. If the measured feed time of the prior sheet exceeds a maximum feed time, the pick delay is the same as for the prior sheet. If the measured feed time of the prior sheet does not exceed the maximum feed time and the measured feed time of the prior sheet was less than the expected feed time, the pick delay is greater than the pick delay of the prior sheet. If the measured feed time of the prior sheet does not exceed the maximum feed time and the measured feed time of the prior sheet was not less than the expected feed time, the pick delay is less than the pick delay for the prior sheet.

Abstract: A method of controlling a speed of a print medium through a printer includes the step of providing a print medium transport assembly with a range of print medium transport speeds between a minimum print medium transport speed and a maximum print medium transport speed. A print engine is provided with a print engine speed. The range of print medium transport speeds is divided into subranges of print medium transport speeds. A requested speed is provided to the print medium transport assembly which corresponds to the print engine speed. For each subrange, an acceleration profile control equation, a constant speed control equation, and a deceleration profile control equation is determined. The constant speed control equation is dependent upon the requested speed. One of the subranges of print medium transport speeds is identified which encompasses the requested speed.

Abstract: A dam has a plurality of substantially parallel ribs with recesses therebetween. At least one of the recesses has a pad therein with its sheet engaging surface being interior of the sheet engaging surfaces of the ribs. The rib surfaces, which are engaged first by the sheets being fed, have a lower coefficient of friction with the sheets than the sheet engaging surface of the pad. If more than one sheet is fed from a stack to the dam, the sheets will strike the rib surfaces first and then the pad surface if not separated from each other by the rib surfaces. Since the pad surface has a coefficient of friction substantially equal to the sheet to sheet friction, this step function in friction helps to separate the top sheet from the next adjacent sheet.

Abstract: A staging assembly for use in an image forming apparatus. The image forming apparatus includes a paper feed assembly having a plurality of rollers for feeding a transfer sheet to an electrophotographic assembly. A removable idler gear is interposed between the paper feed assembly and the electrophotographic assembly, and drives the paper feed assembly when installed. A staging assembly drives the paper feed assembly when the idler gear is removed and includes a rotatable drive element for connection to and rotation of one of the rollers; a drive unit for rotatably driving the rotatable drive element; and an electrical connector for electrically connecting the staging assembly to the electrophotographic assembly. The staging assembly is a modular assembly which is connectable to and removable from the paper feed assembly.