Abstract: To provide a gear unit apparatus for a printer in which the assembling characteristics and maintenance workability of driving sections for transferring a printing paper to be printed can be improved, and particularly assembling, replacement and maintenance work can be easily performed on a platen roller and a transfer roller. The present invention focuses on unitizing a group of belts and a group of gears independently of a printer main body, and is configured such that a unit bracket that is detachable to a printer bracket is provided independently of the printer bracket, a drive motor, the belt group and the gear group are assembled to the unit bracket, and, when the unit bracket is attached to the printer bracket, a platen roller gear of a platen roller and a transfer roller gear of a transfer roller can be engaged with each other.

Abstract: Provided is a printer that employs a platen roller as conveying means, for which the accuracy of the assembly of the constituents of a drive transmission mechanism that drives a platen roller is increased, and the heat releasing function of a motor that is a drive source is also improved, so that downsizing and increasing output can be coped with.

Abstract: A driving apparatus includes a driving gear bidirectionally rotatable by a driving source, at least two driven gears selectively driven by the driving gear, at least two swing gears connected to the driving gear to operate in combination with the driving gear and to transmit a driving force of the driving gear to the driven gears, a swing lever pivotally disposed to support the swing gears, and an adjusting unit to adjust a swing position of the swing lever.

Abstract: The image forming apparatus includes a chassis, a feed roller, and a press roller. The chassis includes first and side surfaces, a bottom surface that connects the first and second side surfaces, and a curved part formed unitarily with the bottom surface. The curved part has a feed roller bearing support portion. The feed roller is rotatably supported between the first and second side surfaces via feed roller support bearings for conveying paper. The feed roller bearing support portion of the curved part supports one of the feed roller support bearings. The press roller is rotatably supported between the first and second side surfaces for pressing on the feed roller. The feed roller has a paper conveying portion that has a plurality of projecting portions. A widthwise center of the paper conveying portion substantially matches with a widthwise center between the pair of feed roller bearings.

Abstract: An image forming apparatus includes a chassis, a motor, a drive transmission gear that receives rotational force from the motor, a feed roller rotatably supported by the chassis, an intermediate gear that has a circular bearing, receives rotational force from the drive transmission gear, and transmits rotational force to the feed roller gear, and a gear support axle that is inserted through the bearing of the intermediate gear for rotatably supporting the intermediate gear. The gear support axle is provided with a bearing engagement part. The bearing engagement part has at least one flat section, at least one circular section, and at least two support portions formed between the flat section and the circular section, such that the gear support axle is supported by the bearing at at least one of the two support portions.

Abstract: A recording method, for example, which allows a recording medium to be carried with high carrying precision is to be achieved. A recording method includes a step of changing a carry command value, when carrying a recording medium, according to a state of bending of the recording medium that is carried, a step of carrying the recording medium based on the carry command value that has been changed, and a step of recording on the recording medium that has been carried.

Abstract: In an image-recording device of the present invention, driving force of a motor for driving is transmitted to two idle gears, which are the same shape and are disposed at positions of linear symmetry with respect to a center line C. Driving force is transmitted by way of the idle gears to power-input gears which are fixed coaxially with a supply gear and an ejection gear, respectively. That is, a supply side driving force transmission system, ranging from the motor to the supply gear, and a discharge side driving force transmission system, ranging from the motor to the ejection gear, have the same structure. Therefore, a recording sheet will be stably conveyed at the same conveyance speed throughout an image recording region, and high quality image recording can be carried out reliably. Thus, conveyance amounts can be kept consistent in the image recording region, even without using special apparatus, and high quality images can be recorded at low cost.

Abstract: A print media feed system for advancing a sheet of print media having a leading edge and a trailing edge in a sheet feed direction through a print zone in an imaging apparatus includes a rotating support positioned downstream of an exit roller in relation to a sheet feed direction. The rotating support provides a rotating support surface that engages a non-printed side of the sheet of print media downstream of the exit roller while the trailing edge of the sheet of print media is advanced through the print zone by the exit roller, the rotating support not contributing to advance the trailing edge of the sheet of print media through the print zone, but contributing to advance the sheet of print media after the sheet of print media is released by the exit roller.

Abstract: A backlash correction device of this invention has a motor, a gear transmitting a moving force from the motor to a paper feed base, a spring urging the paper feed base to one of forward and backward movement directions of the paper feed base using an urging force, and a controller. (1) If the paper feed base is moved in an opposite direction to an urging direction of the spring, the controller drives the motor in a movement direction of the paper feed base by a predetermined movement quantity. (2) If the paper feed base is moved in a same direction as the urging direction of the spring, the controller (2-1) drives the motor in a movement direction of the paper feed base by a movement quantity which is the sum of the predetermined movement quantity and a correction quantity equal to or greater than a maximum backlash quantity, and (2-2) then drives the motor in an opposite direction by the correction quantity.

Abstract: A sheet transport device and a recording apparatus include a transport roller constructed as a unit including a first gear and a protective member both integrally mounted on its rotary shaft, thereby ensuring easy handling, an inexpensive cost, good efficiency of assembly work, and high reliability. A transport roller gear (first gear) is provided at one end of the transport roller, and a substantially umbrella-shaped gear cover (protective member) is mounted to the outer side of the transport roller gear. The transport roller is constructed as a unit (transport roller unit) including the transport roller gear and the gear cover both integrally mounted on its rotary shaft. With this unitary structure, the transport roller can be easily handled, simply assembled into an apparatus body, and assembled with higher efficiency. The gear cover protects the least necessary gear(s), e.g., only the transport roller gear on the transport roller, and hence can be provided at an inexpensive cost.

Abstract: A mechanism for selectively switching two drive transmission systems by one driving source is provided and a rocking lever which can be rocked between a first drive transmission gear of a first drive transmission system and a first drive transmission gear of a second drive transmission system respectively located on both sides of a drive shaft is provided. A rocking gear located between both drive transmission gears and selectively engaged with both drive transmission gears by the rock for transmitting driving force from the driving source is attached to the rocking lever and a locking means locks the rocking lever in a state that the locking means is engaged with either of the both drive transmission gears. The first drive transmission system and the second drive transmission system are connected to a drive unit normally and reversely rotated.

Abstract: A backlash correction device of this invention has a motor, a gear transmitting a moving force from the motor to a paper feed base, a spring urging the paper feed base to one of forward and backward movement directions of the paper feed base using an urging force, and a controller. (1) If the paper feed base is moved in an opposite direction to an urging direction of the spring, the controller drives the motor in a movement direction of the paper feed base by a predetermined movement quantity. (2) If the paper feed base is moved in a same direction as the urging direction of the spring, the controller (2-1) drives the motor in a movement direction of the paper feed base by a movement quantity which is the sum of the predetermined movement quantity and a correction quantity equal to or greater than a maximum backlash quantity, and (2-2) then drives the motor in an opposite direction by the correction quantity.

Abstract: An improved image forming apparatus is provided for performing a printing operation on a series of paper and having a serial paper feeding device and a single sheet feeding device. The apparatus causes no paper jams of the series of paper while returning the series of paper to switch from a serial paper feeding mode to a single sheet feeding mode. The image forming apparatus includes a tractor wheel for conveying a series of paper to a printing area and for retreating the series of paper, and a tractor shaft for pivoting the tractor wheel. The image forming apparatus for feeding the series of paper by a serial paper feeding device causes a certain backlash in an initial pivotal movement of the tractor wheel and the tractor shaft.