Abstract: An image forming apparatus includes a fixing portion, a first acquisition processing portion, a first determination processing portion, and a restriction processing portion. The fixing portion is provided rotatably around a rotation shaft. The first acquisition processing portion acquires first temperature information regarding the temperature of the fixing portion at the end of a first image forming process of forming an image on a first sheet whose size in a width direction along the rotation shaft is smaller than a reference size. The first determination processing portion determines an execution time of a cooling process of cooling the fixing portion, based on the first temperature information. In a case where the execution time of the cooling process determined by the first determination processing portion exceeds an upper limit time, the restriction processing portion restricts the execution of the cooling process exceeding the upper limit time.

Abstract: An image forming apparatus includes a temperature sensor, a conveyance control portion, a driving control portion, an adjustment processing portion, and a stop processing portion. The temperature sensor is provided apart from a contact position between a fixing member and a transferred sheet to which a toner image has been transferred. The conveyance control portion continuously executes conveyance processes of conveying the transferred sheet. The driving control portion controls driving of a heater for heating the fixing member so that a temperature detected by the temperature sensor matches a predetermined temperature. The adjustment processing portion restricts the execution of the conveyance process until an adjustment process of adjusting a formation condition of the transferred sheet is completed. The stop processing portion stops the continuous execution of the conveyance processes when the restriction on the execution of the conveyance process continues beyond a predetermined timing.

Abstract: An image forming apparatus includes a temperature sensor, a conveyance control portion, a driving control portion, an adjustment processing portion, and a stop processing portion. The temperature sensor is provided apart from a contact position between a fixing member and a transferred sheet to which a toner image has been transferred. The conveyance control portion continuously executes conveyance processes of conveying the transferred sheet. The driving control portion controls driving of a heater for heating the fixing member so that a temperature detected by the temperature sensor matches a predetermined temperature. The adjustment processing portion restricts the execution of the conveyance process until an adjustment process of adjusting a formation condition of the transferred sheet is completed. The stop processing portion stops the continuous execution of the conveyance processes when the restriction on the execution of the conveyance process continues beyond a predetermined timing.

Abstract: An image forming apparatus is provided with a sheet conveying device, a transfer device, a fixing device, a temperature sensor, a temperature control portion, and a conveyance control portion. The temperature control portion regulates power supplied to the heater by comparing between a temperature measured by the temperature sensor and a preset target temperature. The temperature control portion sets the target temperature to a first target temperature when an operation mode is a normal mode, and to a second target temperature lower than the first target temperature when the operation mode is a special mode. In a case in which the sequential printing process is performed, the conveyance control portion makes the sheet conveying device convey sheets at a longer interval when the operation mode is the special mode than when the operation mode is the normal mode.

Abstract: An image forming apparatus includes a photoreceptor and an exposure device. The exposure device is configured to expose a surface of the photoreceptor and to form an electrostatic latent image. The exposure device includes a light source, a polygon mirror and a polygon motor. The light source is configured to emit a beam. The polygon mirror is configured to deflect the beam emitted from the light source. The polygon motor is configured to rotate the polygon mirror. The polygon motor is rotated at least temporarily when an aging mode to remove moisture from the surface of the photoreceptor is executed.

Abstract: An image forming apparatus includes a photoreceptor and an exposure device. The exposure device is configured to expose a surface of the photoreceptor and to form an electrostatic latent image. The exposure device includes a light source, a polygon mirror and a polygon motor. The light source is configured to emit a beam. The polygon mirror is configured to deflect the beam emitted from the light source. The polygon motor is configured to rotate the polygon mirror. The polygon motor is rotated at least temporarily when an aging mode to remove moisture from the surface of the photoreceptor is executed.

Abstract: A temperature detection device includes: a thermocouple configured to output a first signal value corresponding to a thermoelectromotive force generated between a hot junction and a cold junction thereof, a detection portion configured to output a second signal value corresponding to a temperature of the cold junction; a conversion processing portion; and a calculation processing portion, and detects a temperature of a fixing member by using a high-degree expression for temperature calculation that includes variables for which the first signal value and the second signal value are to be substituted.

Abstract: A temperature detection device includes: a thermocouple configured to output a first signal value corresponding to a thermoelectromotive force generated between a hot junction and a cold junction thereof, a detection portion configured to output a second signal value corresponding to a temperature of the cold junction; a conversion processing portion; and a calculation processing portion, and detects a temperature of a fixing member by using a high-degree expression for temperature calculation that includes variables for which the first signal value and the second signal value are to be substituted.

Abstract: A fixing device is provided with a magnetic flux generating unit, first and second rotary bodies, a fixing belt, a temperature sensing portion, a stopped time measuring portion, an abnormality determination portion, and a heating delay portion. The fixing belt extends between the first and second rotary bodies, and is heated by the first rotary body. The temperature sensing portion is disposed downstream of the first rotary body and senses the temperature of the fixing belt. The stopped time measuring portion measures a time period after heating has been stopped before an instruction to start heating is inputted. The abnormality determination portion determines any abnormality in the fixing belt based on a change in temperature after heating has started. When a stopped time is shorter than a pre-configured time period, the heating delay portion delays the start time via magnetic flux based on the instruction to start heating.

Abstract: A fixing device is provided with a magnetic flux generating unit, first and second rotary bodies, a fixing belt, a temperature sensing portion, a stopped time measuring portion, an abnormality determination portion, and a heating delay portion. The fixing belt extends between the first and second rotary bodies, and is heated by the first rotary body. The temperature sensing portion is disposed downstream of the first rotary body and senses the temperature of the fixing belt. The stopped time measuring portion measures a time period after heating has been stopped before an instruction to start heating is inputted. The abnormality determination portion determines any abnormality in the fixing belt based on a change in temperature after heating has started. When a stopped time is shorter than a pre-configured time period, the heating delay portion delays the start time via magnetic flux based on the instruction to start heating.

Abstract: An image forming apparatus includes: an image formation portion; a fixing portion that includes an exciting coil for inductively heating member and a temperature detection member: a main control portion that stops a printing operation when a temperature abnormality is recognized; a notification portion; a power supply portion that supplies power to the exciting coil; and a heating control portion that controls power supply to the exciting coil and detects the power abnormality. When the heating control portion detects a power abnormality, the heating control portion stops the induction heating, provides stop notice; when the main control portion determines, based on the history of the stop notice, whether the temperature abnormality is due to the stop of the induction heating or is not due to the stop of the induction heating.

Abstract: An image forming apparatus includes a fixing device including a heating roller heated by a fixing heater, a DUTY storage portion, a heater control portion, a number-of-times counting portion, a number-of-times determining portion, and a modifying portion. The DUTY storage portion stores a first DUTY table and a second DUTY table. The heater control portion reduces the consumption current of the fixing heater based on the first DUTY table when a total consumption current exceeds a setting current. The number-of-times counting portion counts the number of times the total consumption current has exceeded the setting current. The modifying portion causes the heater control portion to control the energization of the fixing heater based on the second DUTY table when the number-of-times determining portion determines that the number of times of excess exceeds a setting number of times.

Abstract: An image forming apparatus includes: an image formation portion; a fixing portion that includes an exciting coil for inductively heating member and a temperature detection member: a main control portion that stops a printing operation when a temperature abnormality is recognized; a notification portion; a power supply portion that supplies power to the exciting coil; and a heating control portion that controls power supply to the exciting coil and detects the power abnormality. When the heating control portion detects a power abnormality, the heating control portion stops the induction heating, provides stop notice; when the main control portion determines, based on the history of the stop notice, whether the temperature abnormality is due to the stop of the induction heating or is not due to the stop of the induction heating.

Abstract: An image forming apparatus includes a fixing device including a heating roller heated by a fixing heater, a DUTY storage portion, a heater control portion, a number-of-times counting portion, a number-of-times determining portion, and a modifying portion. The DUTY storage portion stores a first DUTY table and a second DUTY table. The heater control portion reduces the consumption current of the fixing heater based on the first DUTY table when a total consumption current exceeds a setting current. The number-of-times counting portion counts the number of times the total consumption current has exceeded the setting current. The modifying portion causes the heater control portion to control the energization of the fixing heater based on the second DUTY table when the number-of-times determining portion determines that the number of times of excess exceeds a setting number of times.

Abstract: A color cathode ray tube of the present invention includes an evacuated envelop that is structured from a panel having a phosphor screen on its inner surface, a neck portion containing therein an electron gun assembly, and a cone-shaped section called the funnel for integrally coupling the panel and the neck together, wherein when the main scanning direction of a display screen formed of the panel is defined as an X direction whereas a direction at right angles to the main scan direction is as a Y-direction, an equivalent radius of curvature Rxo of an outer surface of the panel in the X direction is at least 2.6 times greater than an equivalent curvature radius Rxi of the inner surface while forming on the inner panel surface an inside light absorption layer that is comprised of pigments as its principal component.

Abstract: The present invention provides an excellent color cathode ray tube of a black matrix type which can reduce the irregularities of a phosphor screen, can exhibits the uniformity of screen, can exhibit the favorable quality of screen, and can obtain the image display of high quality. The size T of a boundary portion between a large hole and a small hole of each electron beam aperture formed in a shadow mask is made small and the surface roughness of an inner surface is made small so that the Irregularity index which expresses the uniformity of the phosphor screen can be set to a value not greater than 7%.

Abstract: A color cathode-ray tube providing a nonglare effect which can be regenerated without degradation of its nonglare function and which can be inexpensively formed. A light scattering film composed of metal containing compound micro-particles having a high index of refraction and a particle size of 0.1 &mgr;m to 2 &mgr;m is formed in contact with the internal surface of a faceplate of the color cathode-ray tube, and a black matrix having a multiplicity of holes is formed on the light scattering film. A red phosphor layer, a green phosphor layer and a blue phosphor-layer are formed in the holes of the black matrix on the light scattering film in such a manner that the phosphor layers of red, green and blue are disposed cyclically in that order. External light incident on the faceplate is partly reflected by the external surface of the faceplate, and the remainder of the external light passes through the faceplate and is made incident on the light scattering film.

Abstract: A feeding mechanism of an eyelet-end buttonhole sewing machine comprising a bed shaft rotatably supported by a bed, a rapid feed shaft rotatably supported by the bed, a pattern wheel shaft being rotatably supported by the bed and driven by the rapid feed shaft, and a feed wheel being rotatably supported by the bed and driven by the pattern wheel shaft for giving rapid feed to a cloth to be sewn in a forward and backward direction, and also being rotatably driven by the bed shaft for giving rapid feed to the cloth to be sewn in a forward and backward direction involved in a sewing step, the feeding mechanism further comprising a rotary driving source being rotatably driven normally and reversely, a bed shaft rotary member being rotatably driven normally and reversely by the rotary driving source, a rapid feed rotary member being fixed to the rapid feed shaft and retained by the bed shaft rotary member so as to be reversely rotated therewith, a one way sewing clutch for transmitting only a normal rotation of th

Abstract: This invention relates to a process for forming a pattern using a photosensitive composition comprising a polymeric azide and a high-molecular weight copolymer or polymer. The photosensitive composition comprises a copolymer containing at least a water-soluble non-photosensitive monomeric unit having an electrolytic functional group, a monomeric unit having an azido group and an electrolytic functional group and a high-soluble high molecular weight copolymer or polymer which exhibits reciprocity law failure characteristic.

Abstract: A stop lever fixing lever supported at a bed body of a sewing machine has one end to be contacted by a projection of a pattern wheel. A connecting member has one end connected to the other end of the stop lever fixing lever. A first presser bar lifter has one end connected to the other end of the connecting member. A second presser bar lifter has one end defining an operation arm positioned at a lifting position and has a folded projection provided with a hole. A stepped screw having a knurled thumb at the peripheral surface thereof is rotatably inserted in the hole of the folded projection edge with a small diameter screw portion at the tip end thereof. A lever shifting member is screwed into the small diameter screw portion at the folded projection edge. A presser bar lifter cam is disposed along a cutting axis and has a projection.