Abstract: A method and a device for controlling a supply of a developer are provided. An amount of the developer is sensed during warm-up and a determination is made as to whether the sensed amount is equal to or less than a predetermined threshold during warm-up. The developer is supplied during warm-up and the amount of the developer is sensed when a determination is made that the sensed amount is equal to or less than the threshold. The supplying of the developer is stopped during warm-up when a determination is made that the sensed amount is greater than the threshold. Also, the method may include determining whether an amount of the developer is greater than a predetermined threshold by analyzing a given flag and stopping the supply of the developer and forming an image using the developer, when it is determined that the amount of the developer is greater than the threshold.

Abstract: Provided is an image forming apparatus that can achieve a stable image quality from a leading-end side to a trailing-end side of an image when printing a high-density image on a transfer medium, regardless of the length of the transfer medium or the condition of the image forming apparatus.

Abstract: When a toner image including an edge area (Ae) corresponding to an area defined between edges of a transfer material (P), and an internal area (Ai) corresponding to an area inside the edge area (Ae) is formed on an image bearing member (11), the toner image in the edge area is subjected to toner amount increment processing of incrementing a toner amount.

Abstract: A high voltage power controlling apparatus of an image forming apparatus including a DC (direct current) power controller to convert and output a first PWM (pulse width modulation) signal provided from an engine controller into a switching waveform signal, a first voltage transformer to transform the switching waveform signal output from the DC power controller, a rectifier to rectify output power transformed by the first voltage transformer into DC power, first through N(where N is a positive integer greater than one) DC supplies to adjust and output the DC power rectified by the rectifier such that the DC power is adjusted to a predetermined level, first through N AC (alternating current) power controllers to convert and output a second PWM signal provided from the engine controller into switching waveform signals, and second through N+1 voltage transformer to transform the switching waveform signals output from the first through N AC power controllers, to overlap the transformed powers with the DC powers h

Abstract: A developing device including a development part for developing latent images to toner images. The developing device also includes an agitation part that agitates developer, and a controller, which controls an agitation strength of an agitator in the agitation part. The developer circulates between the development part and the agitation part.

Abstract: A developing device includes: a developing device main body that a developer chamber containing a developer is formed; a pressure application area forming unit that is provided in the developer chamber so as to form a pressure application area where pressure is applied to the developer in the developer chamber because of movement of the developer contained in the developer chamber; and a pressure regulating unit that regulates the pressure applied to the developer in the pressure application area in response to temperature of the developer in the pressure application area.

Abstract: The image forming apparatus includes a developing chamber an agitating chamber, a first conveying screw which is arranged in the developing chamber and coveys developer from one end to the other end of the first chamber, a second conveying screw which is arranged in the agitating chamber and conveys developer from one end to the other end of the second chamber, a developing sleeve which bears developer supplied from the developing chamber and conveys the developer to the agitating chamber via a developing area opposed to a photosensitive drum, motors, which drive the developing sleeve, the first conveying screw and the second conveying screw, and a controller which controls drive of the developing sleeve and the second conveying screw so that trigger timing of drive stopping of at least the second conveying screw is to be later than trigger timing of drive stopping of the developing sleeve.

Abstract: A developing device is disposed facing an image bearing body that bears a latent image. The developing device includes a developer bearing body that bears a developer for developing the latent image. The developer includes mother particles and external additives. A liberation amount T (weight parts) of the external additives liberated from the mother particles with respect to 100 weight parts of the mother particles, a surface roughness Rz (m) of the developer bearing body, and a circumferential speed Vd (mm/s) of the developer bearing body satisfy the following relationships: 1.326×10?1?T?2.142×10?1 (weight parts), 7.1×10?6?Rz?15.0×10?6 (m), 161.5?Vd?189.2 (mm/s), and 4.98×10?6?(T×Rz/Vd)?1.99×10?5 (s).

Abstract: An apparatus includes: an image carrier; a charger to uniformly charge a surface of the image carrier; an exposing unit to perform write scanning on the image carrier; a developing unit that includes a developer carrier carrying a developer including a toner and that is configured to perform a visible image process on an electrostatic latent image formed on the image carrier; and a transferor to transfer a toner image that has been subjected to the process onto a material. If length Lg of a non-image part directly before an image part in an image carrier moving direction has the relation of Lg??·Ds/(Vs/Vp), where Vp and Vs are circumferential velocities of the image carrier and the developer carrier and Ds is a diameter of the developer carrier, suppression of toner attachment on the material is controlled in a predetermined length from an image front end in the direction.

Abstract: In a development apparatus including conveying screws which circulates and conveys developer in a developer container as being rotated, a developing sleeve which bears and conveys developer in the developer container as being rotated, and a restriction blade which restricts developer quantity at the developing sleeve, the developer container includes a supply chamber to supply developer to the developing sleeve and a retrieval chamber to retrieve developer from the developing sleeve, and rotation speed of the conveying screws or rotation speed of the developing sleeve is changed so that Vsc/Vsl during image forming is not performed is to be smaller than that during image forming is performed, as Vsc denotes the rotation speed of the conveying screws and Vsl denotes the rotation speed of the developing sleeve.

Abstract: A method of changing a color developer in a developer housing of xerographic marking system are disclosed, and may include supplying a chart divided into a plurality of color family sections or quadrants, selecting a new color to be installed in a developer housing corresponding to the color family section, purging old toner from the developer housing until a concentration of old toner is reduced to about 0.1% to 6.0% from its nominal concentration, installing a container of a new color developer in the developer housing, and running the marking system until the required concentration of the new color developer is attained.

Abstract: There is provided an image forming apparatus capable of realizing improvement of an image density by improving dot reproducibility and reducing fog at the same time. An alternating voltage is applied to a development sleeve so that a first period during which a first peak-to-peak voltage Vpp(1) is applied and a second period during which a second peak-to-peak voltage Vpp(2) that is lower than the first peak-to-peak voltage is applied are repeated alternately. The alternating voltage to be applied is applied so that a development-side potential to move toner from the development sleeve to a photoreceptor and an opposite development-side potential to move toner from the photoreceptor to the development sleeve alternate with each other. The potential to be finally applied in the first period is preferably the development-side potential.

Abstract: When dynamic torques are Ts, Ti, and T2, respectively, and rotation angle speeds are Rs, R1, and R2, respectively, at the time of rotations of the developing sleeve 40 and the screws 41 and 42, the mass of the developer housed in the second agitating chamber 902 is M2, the mass of the developer which is present in the space of the side of the developing sleeve when a space formed by the developing chamber 900 and the first agitating chamber 901 is divided is Ms, the mass of the developer which is present in the space of the side of the screw 41 is M1, gravitational acceleration is G, each load on the developer by rotations of the developing sleeve and the screws is defined as Wds (mW/g)=Rs×Ts×G/Ms, Wd1(mW/g)=R1×T1×G/M1, and Wd2 (mW/g)=R2×T2×G/M2, respectively, relationships of 0.5<Wds/(Wd1+Wd2)?7.0, 12.5?Wds?57.5, and Wd1<Wd2 are satisfied.

Abstract: An image formation apparatus, an image formation method, an image formation program, and a computer-readable recording medium are provided, a rotation of the developer supply roller is controlled in order to prevent plugging of the developer supply roller based on quality information and environmental information.

Abstract: An image forming apparatus includes a controller that starts a forced drive stop sequence for stopping image formation at least by stopping rotation of a developer carrier in a first direction when a number of printed sheets reach a threshold. The forced drive stop sequence rotates the developer carrier in a second direction for a prescribed time period when the image formation is stopped. The forced drive stop sequence stops the rotation of the developer carrier in the second direction and resumes the image formation after the prescribed time has elapsed.

Abstract: According to one embodiment, an image forming apparatus includes: a developing device configured to store, on the inside, a developer containing a toner and a carrier and discharge a part of the stored developer; a supply unit configured to supply the developer to the developing device; a mixer arranged in the developing device and configured to rotate at first rotating speed or second rotating speed lower than the first rotating speed and agitate the developer; a number-of-sheets-information acquiring unit configured to acquire number-of-sheets information, which is information indicating a number of sheets output by execution of image output processing; a determining unit configured to determine, on the basis of the number-of-sheets information acquired by the number-of-sheets-information acquiring unit, whether the number of output sheets reaches a predetermined threshold; and an agitation control unit configured to switch, if the determining unit determines that the number of output sheets reaches the thr

Abstract: An image forming apparatus has an image bearing member that moves at a specified speed; a toner pattern forming section for forming toner patterns of a specified type on the image bearing member under specified image forming conditions; a toner pattern detection member for detecting the toner patterns formed on the image bearing member; a toner amount varying section for varying a target amount of toner to adhere to the toner patterns; and a control section that calculates a toner adherence amount and a toner adherence position from detection results outputted from the toner pattern detection member and that performs image stabilization control to adjust the image forming conditions based on the calculation results. In the image stabilization control, the control section uses detection results of the same toner patterns both to calculate the toner adherence amount and to calculate the toner adherence position.

Abstract: An image forming apparatus performs prints image data. A dividing section divides the image data of a print job into a plurality of sub data areas m(i) (i=1 to n). A duty computing section computes a print duty for each of the plurality of sub data areas (m(1)-m(n)) based on the number of printed dots in the print job and a total number of printable dots in a printable area. A first power supply applies a first voltage to a developing roller. A second power supply applies a second voltage to the developer supplying roller. The voltage difference between the first and second voltages is determined in accordance with the print duty.

Abstract: Methods are presented for calibrating or characterizing a printing system with respect to at least one color, in which a toner reproduction curve (TRC) is measured and curve-fitted according to a least squares solution using a set of spline basis functions having high spline density in regions of high TRC curvature and/or high measurement noise, with the weights of the spline functions being restricted to positive values to maintain monotonicity of the TRC.

Abstract: A motor control apparatus for controlling a DC motor includes a first detection unit configured to detect an angular velocity of the DC motor, a driven member configured to be driven by the DC motor, a control unit configured to perform, during start-up of the DC motor, feed forward control for changing a control value used for controlling drive of the DC motor from a first control value corresponding to an angular velocity smaller than a target angular velocity to a second control value corresponding to the target angular velocity, and to change the feed forward control to feedback control for controlling the control value based on a detection result by the first detection unit to keep the DC motor at the target angular velocity, and a second detection unit configured to detect whether the driven member has been replaced.

Abstract: Multi-color document processing systems and methods are described in which the toner detachment field distribution curve is measured as a function of transfer field and the curve is shifted by adjustment of one or more toner state adjustment actuators to facilitate operation at lower transfer field levels for mitigating retransfer and other high field defects.

Abstract: A detection unit is disposed between a feeding unit and a secondary transfer unit on a conveyance path, and detects a transfer material that is conveyed. A control unit, if the detection unit cannot detect the transfer material by a predetermined timing after a feeding operation by a feeding unit, moves the secondary transfer unit away from a intermediate transfer member, causes the intermediate transfer member to continue rotating, and causes the feeding unit to retry feeding the transfer material.

Abstract: In an electrophotographic image forming apparatus employing a contact development system, contact of a development roller 64 against a photosensitive drum 61 is started while forming an electrostatic latent image of a detection pattern 81 for detection in each individual apparatus, and a developed toner image is detected at a predetermined position. At this time, a time as from the time when contact of the development roller 64 was started until the time when the toner image was detected is measured, and a delay time Xs from a time (t11) when contact operation of the development roller 64 was started until a time (t131) of actual contact is calculated by subtracting the time needed until the developed toner image reaches the detection position. The time when contact of the development roller 64 is started is delayed by this time. The same sort of control is also performed for the separation time.

Abstract: An image forming apparatus determines whether an amount of colorant remaining in a container is equal to or greater than a threshold value and controls a print unit to perform a reduced printing operation with a reduced amount of colorant if the amount of the remaining colorant is less than the threshold value is made and to perform the reduced printing operation on one side of a new non-printed sheet instead of performing the reduced printing operation on the opposite side of a one-side printed sheet existing if the amount of the remaining colorant is less than the threshold value.

Abstract: A method for monitoring development parameters of a liquid toner electrophotographic (LEP) printer, the method comprising defining an operational window for a current utilized by the printer and monitoring the current to determine a deviation of the current outside the operational window.

Abstract: A disclosed developing device includes a developing roller; a supply roller that is in contact with the developing roller and configured to supply toner to the developing roller; a current measuring unit configured to measure an electric current that flows from the developing roller to the supply roller when the toner is supplied from the supply roller to the developing roller; and an error determining unit configured to detect a development error of the developing roller based on the electric current measured by the current measuring unit.

Abstract: An image forming apparatus includes a toner-layer filling-rate lowering unit that causes a toner layer of toner images to be formed on an image carrier so that the toner layer has sufficient optical transparency for exposing and the toner-layer filling rate is set relatively low; and a toner rolling rate adjusting unit that rolls the toner images at a predetermined toner rolling rate in accordance with the toner-layer filling rate when the toner images are transferred to the transferring/fixing unit.

Abstract: A developing device includes a developer container that contains a two-component developer including a carrier and a toner attached to the carrier through a frictional electrification. The developing device also includes a developing roller that supplies the two-component developer from the developer container to an image carrier. Further, the developing device includes a first developer supplying unit, and a second developer supplying unit that is aligned with the first developer supplying unit and located more distant from the developing roller than the first developer supplying unit is from the developing roller. The first developer supplying unit and the second developer supplying unit circularly convey the two-component developer while stirring the two-component developer to supply the two-component developer to the developing roller. An absolute rotation speed of the second developer supplying unit is changeable without a change in a rotation speed of the developing roller.

Abstract: A developer supply device, comprising a casing having: a developer reservoir at a bottom part of the casing; a developer amount adjustment chamber provided close to a side of the developer reservoir to communicate with a top portion of the developer reservoir; and a communication part through which the top portion of the developer reservoir and the developer amount adjustment chamber communicate with each other, and further comprising: a carrying substrate having electrodes arranged along a developer transport path to carry a developer through a traveling electric field, each of the electrodes having a longer side extending in a width direction of the developer reservoir, and a developer providing unit to provide the developer into the developer reservoir, and wherein the carrying substrate comprises an upper carrying substrate on an inner wall of the casing on an opposite side of the communication part to carry the developer upward.

Abstract: A power source includes a charging voltage generation unit configured to generate a charging voltage to charge an image bearing member, a developing voltage generation unit configured to generate a developing voltage to develop an electrostatic latent image formed on the image bearing member, a control unit configured to control an output from the developing voltage generation unit, and a correction unit configured to correct an operation of the control unit based on an output from the charging voltage generation unit.

Abstract: An image forming apparatus includes an image forming device, a time detection unit, a humidity measurement unit and a controller. The image forming device includes a photoconductive body, a developing device and a transfer device. The time detection unit detects information concerning a stop time period of the developing device. The humidity measurement unit is provided in a casing in which the image forming device is provided and measures a humidity. The controller controls a developer supply member in the developing device based on the information concerning the stop time period detected by the time detection unit and information concerning the humidity measured by the humidity measurement unit, so as to rotate at a lower speed than a rotation speed at a normal time before the developing device starts a first developing operation after the developing device stopped.

Abstract: A control unit is provided with an excitation current output section for outputting an excitation current to a stepping motor, a first level judging section for judging a drive stop time level indicating the duration of a time during which the stepping motor is not driven, a storage storing a plurality of starting torque values required to start driving the stepping motor and a plurality of drive stop time levels while relating them to each other, and a controller for obtaining the starting torque value corresponding to the drive stop time level judged by the first level judging section by referring to the storage, calculating an excitation current value which gives the obtained starting torque value and outputting an excitation current having the calculated excitation current value.

Abstract: In an image forming apparatus of a rotary type, when a pause is made during continuous image formation, the time taken to restart image formation after the pause is shortened so as to reduce stress on the user. In the image forming apparatus, it is determined beforehand whether the next image formation mode is a color mode or a mono mode, and a developing device to be first used in the next image formation mode is moved to a developing standby position.

Abstract: A developing unit driving apparatus which drives a developing unit having a toner cartridge to accommodate a toner, a developing part disposed in the toner cartridge to develop the toner to a photosensitive body, and a toner supplying part provided in the toner cartridge to supply the toner to the developing part, the apparatus includes: a driving source; a first power transmitter which transmits power supplied from the driving source to the developing part; and a second power transmitter which transmits the power supplied from the driving source to the toner supplying part except when the developing part is driven.

Abstract: An image forming apparatus includes an image bearing member for bearing an electrostatic latent image; a charger for electrically charging the image bearing member by contact of electroconductive magnetic particles carried on a magnetic particle carrying member with the image bearing member; a developing device for developing the electrostatic latent image into a toner image by supplying toner to the electrostatic latent image; a layer thickness detecting device for detecting a thickness of a surface layer of the image bearing member; a supplying device for supplying the magnetic particles to the magnetic particle carrying member with predetermined timing; and a control device for controlling a supply amount of the magnetic particles so that the supply amount of the magnetic particles supplied by the supplying device increases with an increase of an amount of change in thickness, in terms of an absolute value, of the surface layer obtained from a detection result of the layer thickness detecting device.

Abstract: An image forming apparatus includes a cartridge detachably mountable to a main assembly thereof. The cartridge includes a developer carrying member for carrying a developer to develop with the developer a latent image formed on an image bearing member, an conductive member contactable to the carrying member, a developing chamber for holding the carrying member and the conductive member, a developer accommodating chamber for accommodating the developer, and a seal member for sealing an opening for permitting communication between the developing chamber and the developer accommodating chamber. The apparatus further includes a seal member removing device for removing the seal member, and a control device.

Abstract: An image forming apparatus of the present invention includes image carriers arranged side by side in a preselected direction, developing means each for forming a toner image on one of the image carriers, a drive mechanism for driving in the preselected direction a member to which toner images are to be sequentially transferred from the image carriers one above the other, and image transferring devices each for transferring a toner image from one of the image carriers to the above member. At east during an image forming process, a slip condition is substantially the same throughout all image transfer positions where the image carriers face the members.

Abstract: The disclosed image forming apparatus includes a rotatable image holding body configured to hold an electrostatic latent image on a surface of the image holding body, a developing device including a forward rotation developing roller rotatable in a same rotational direction as that of the rotatable image holding body and a reverse rotation developing roller rotatable in a reverse rotational direction to that of the rotatable image holding body, which supply a two-component developer to the surface of the image holding body to form a toner image corresponding to the electrostatic latent image, and a control unit configured to control rotation of the image holding body, the forward rotation developing roller, and the reverse rotation developing roller to supply the two-component developer. The control unit controls the rotation of the image holding body to start after a predetermined time period from starting the rotation of the forward rotation developing roller and the reverse rotation developing roller.

Abstract: An amount of toner transfer on a reference pattern is calculated by using an optical detecting unit that detects both regular reflection light and diffuse reflection light from a detection target simultaneously, based on a relative ratio between a value obtained by subtracting a result of multiplying a “diffuse reflection output” by a “minimum value of a ratio between a regular reflection output and the diffuse reflection output” from the “regular reflection output” of the density detection reference pattern, and a value obtained by subtracting a result of multiplying the “diffuse reflection output” by a “minimum value of a ratio between the regular reflection output and the diffuse reflection output” from the “regular reflection output” in the background of a transfer belt or an intermediate transfer body.

Abstract: An image forming apparatus includes first and second developer carrying members and a control device. The apparatus is operable in a first mode where an image of a single color is formed using the first developer carrying member and is operable in a second mode, wherein an image of a plurality of colors is formed using the first and second developer carrying members. The control device controls a first discharging operation for discharging developer from the first developer carrying member and a second discharging operation for discharging developer from each of the first and second developer carrying members. When the apparatus executes only the first mode, the control device performs more image formations, in a period between completion of the second discharging operation and start of the first discharging operation, compared to a period between completion of the first discharging operation and start of a subsequent first discharging operation.

Abstract: An image forming apparatus includes first and second image forming portions. The first and second image forming portions forms a toner image. The second image forming portion forms a toner image so that the toner image is superimposed on the toner image formed by the first image forming portion. The second image forming portion includes an image bearing member, a cleaning member that removes transfer residual toner existing on the image bearing member at an abutting position, and a supply unit that supplies abrasive particles or toner to the abutting position. The image forming apparatus includes a controller that controls the amount of toners or abrasive particles, which are supplied by the supply unit, in accordance with the amount of toner used in the first and second image forming portions.

Abstract: An image forming apparatus and a control method thereof provides that when circulation of developer in a housing of a developing unit is deteriorated due to concentration of the developer, thus applying increased load to an agitator, the agitator is appropriately rotated forwardly and backwardly under the control of a controller. This may prevent overloading of the agitator and release the concentrated developer.

Abstract: An image forming apparatus including: an image bearing member; and a developer bearing member bearing a developer including a toner and a carrier, the developer bearing member developing an electrostatic image formed on the image bearing member with the developer, and the developer bearing member being applied with an alternate voltage in order to form an alternate electric field between the developer bearing member and the image bearing member, wherein assuming that electric field intensities Eb and Ed be Eb=|(Vp1?VL)/D| and Ed=|(Vp2?VL)/D|, a relationship, 0?K1>K2, is satisfied, where K1: a gradient at Ed, and K2: a gradient at Eb, and wherein a resistivity ?b of the carrier at the electric field intensity Eb satisfies 1.1×106×en<?b<6.0×107 [?·m] (where: e is the base of natural logarithms; and n=4×Eb×10?7).

Abstract: An apparatus includes an irradiation unit configured to irradiate a light onto a toner image, a detection unit configured to detect reflected light from the toner image, and a deriving unit configured to derive a toner adhesion amount of the toner image, based on detection result by the detection unit in measurement range of integer multiple of screen pitch of the toner image.

Abstract: An electrophotographic image forming apparatus fuses an image to a recording medium by heat and pressure. To ensure that the recording medium does not stick to the fusing roller, a non-printable margin is normally reserved at the leading edge of the recording medium. When the recording medium has sufficient stiffness, however, as determined from its thickness and other factors such as its width or orientation, marginless printing is permitted. The setting of an unnecessary margin is thereby avoided.

Abstract: Flat field uniformity can be improved in images produced by an image development system having a development roller interposed between a supply of developer and an imaging element. A raw feed of developer is supplied from the developer supply to the development roller to produce both a metered feed of developer and an overfeed of developer, which is returned to the supply, from the raw feed. A plurality of mass densities of developer used in the system and a plurality of developer velocities through the system are determined, and respective product values of those developer mass densities and those developer velocities are thereafter calculated or otherwise determined. A maximum value of the respective product values is identified, and the image development system is then operated so that the maximum product value is produced.

Abstract: An image forming apparatus includes a development container, a developer bearing member, first and second carrying members that carry developer, a supply device that supplies developer for replenishment, a discharge opening that discharges the developer contained in the development container, a controller that selectively performs one of a first mode and a second mode, a drive device that changes speeds for driving the first and second carrying members, and a counter that measures the number of sheets in the second mode. The controller sets the speed of the drive device in the second mode to be slower than in the first mode, and suspends the second mode and executes a mode for changing the speed of the drive device to a speed faster than in the second mode and driving the first and second carrying members for a predetermined time if a measurement result reaches a reference value.

Abstract: An object of the invention is to provide an electrophotographic photoreceptor showing high responsivity even under a low temperature and low humidity circumstance and capable of compatibilize the decrease of the size and the increase in the image forming speed of an electrophotographic apparatus. In a photosensitive layer of an electrophotographic photoreceptor, oxotitanium phthalocyanine having a crystal form showing a diffraction peak at a Bragg angle 2? (error: 2?±0.2°) of 27.2° in an X-ray diffraction spectrum is contained as a charge generating substance, and an enamine compound represented by the general formula for example, the structural formula (1-1) is contained as a charge transporting substance. Accordingly, the electrophotographic photoreceptor showing high responsivity even under a low temperature and low humidity circumstance is realized.

Abstract: An image forming apparatus includes: a cartridge attachment portion; an image forming unit; a reading unit; and a control unit. A toner cartridge configured to accommodate toner is removably attached to the cartridge attachment portion. The toner cartridge includes a cartridge mechanism unit mechanically driven and a storage medium for storing torque information including information indicating torque used for a mechanical drive of the cartridge mechanism unit. The image forming unit is configured to print an image on a surface of a printing medium using toner accommodated in the toner cartridge. The reading unit is configured to read the torque information from the toner cartridge attached to the cartridge attachment portion. The control unit is configured to determine a number of printing media to be printed by the image forming unit per unit time, according to the torque information read by the reading unit.

Abstract: To provide a recording-material type determination apparatus and recording-material type determination method which can determine the type of recording material using simple calculations as well as to provide an image forming apparatus capable of obtaining stable image quality independent of the type of recording material using the apparatus and method. Based on data read by a read unit which reads surface images of recording material, a first calculation unit calculates the depth of irregularities in the surface of recording material and stores the results of calculation in a register A while a second calculation unit calculates the spacing of irregularities on the surface of the recording material and stores the results of calculation in a register B. Based on the values in the registers A and B, the type of recording material such as gloss paper, plain paper, rough paper or OHT is determined.