摘要:
A heating device for use in an induction heating type fixing system is composed of a sleeve 12 made of an electrical conductive material and an electromagnet 13 with a coil 20 and a core 18. It is constructed so as to fulfill the following formulas (1), (2), and (3).S1+S2.gtoreq.0.3.times.S3 (1)0.2.ltoreq.S2/(S1+S2).ltoreq.0.8 (2)1 mm.ltoreq.Dmax.ltoreq.5 mm (3)wherein S1 stands for the cross sectional area of the core 18, S2 for the cross sectional area of the coil 20, S3 for the cross sectional area of the sleeve 12, and Dmax for the maximum distance formed between the outer periphery of the holder 14 and the inner periphery of the sleeve 12.
摘要:
A chip feed apparatus capable of permitting a chip feed casing to be used for storage and transportation of chips in a distribution channel as well and preventing a weight of chips from being applied to a chip storage space of a hopper, resulting in positive separation and feeding of chips by the hopper. The chip feed apparatus includes a chip feed casing formed on a side surface thereof with a chip outlet, a hopper formed on a side surface thereof with a chip inlet and connected to the chip feed casing while enabling vertical movement of the hopper, a chip separating and aligning pipe inserted into a hole communicating with the chip storage space, and a chip feed path of which one end communicates with the chip separating and aligning pipe and the other end is defined at a chip pick-up position. The chip outlet of the chip feed casing is open at a lowermost end of a chip receiving space or below the lowermost end. The side surface of the chip feed casing and the side surface of the hopper are connected to each other while the chip outlet and chip inlet are kept aligned with each other.
摘要:
An image forming apparatus and a fixing device used therein capable of discriminating transport condition of a sheet in the fixing device without sheet sensors. The fixing device is provided with a fixing roller for heating unfixed toner borne on a sheet and fixing the toner onto the sheet. A temperature sensor is arranged for detecting the temperature of the fixing roller, which temperature sensor communicating with a controller of the image forming apparatus or the fixing device. The controller discriminates the transport condition of the sheet based on the temperature change of the fixing roller detected by the temperature sensor so as to execute varied control.
摘要:
Discharge machining for machining a workpiece in a tapered configuration by applying electric current to the workpiece and the machining electrode, and moving the electrode relative to the workpiece in a main machining direction and also in a direction substantially perpendicular thereto. The electrode is initially advanced relative to the workpiece in the main machining direction to a predetermined position or depth. The electrode is then moved relative to the workpiece in a direction perpendicular to the main machining direction while retracting the electrode. When the machining gap is lowered, the electrode is moved toward the center of the circulating locus of the electrode, and thus a shortcircuit between the electrode and the workpiece can be prevented.
摘要:
Apparatus for automatically inserting parallel leads of electronic components into openings in a printed circuit board having an improved lead holding and guiding assembly. The improved lead holding and guiding assembly is associated with the frame of the apparatus and includes a guiding member mounted for rotation about an axis of rotation which extends in the x-direction, i.e., in the direction of a line which is orthogonal to both of the parallel leads, and for longitudinal movement in the z-direction, i.e., in the direction which is perpendicular to the orthogonal plane which contains the orthogonally extending line. The holding and guiding assembly further includes a pair of holding members disposed at respective sides of the guiding members such that the side surfaces of the end portion of the guiding member and the respective inner side surfaces of the holding members constitute lead holding and guiding portions. The holding members are mounted for rotation relative to the guiding member about respective axes of rotation so that the lead holding and guiding portions can be opened and closed as the holding members are rotated.
摘要:
A fixing device for heating and fixing an unfixed image to a record member, including: a heating roller having a core roller and a layer of a resistance heating material formed on an outer or inner peripheral surface of the core roller; a pair of carriers rotatably carrying the heating roller; a pair of ring-shaped current receiver members each located between the carrier and a center of the heating roller, a pair of current supply members being in contact with the current receiver members; and insulating members made of an electrical insulation material, each being in contact with an outer end of the current receiver member and extending toward the carrier, wherein a distance L3 from the inner end of the carrier to the outer end of the current receiver member is 1 mm or more, a sum (L1+L2) of a width L1 of the insulating member and a height L2 of the insulating member from the core roller is 2.5 mm or more, and the distance L3 and the width L1 satisfy a relationship of L3≧L1. A heat-resistant electrical insulation layer may cover the surface of the resistance heating material layer and a temperature sensing element may be provided, a portion of the element being in contact with the heat-resistant electrical insulation layer of the heating roller and covered with a heat-resistant electrical insulation layer. Each of the heat-resistant electrical insulation layers has a breakdown voltage of 3000 V or more.
摘要:
A fixing device having a rotatable heating member heated by a heat source, a rotatable pressure member for pressing against the rotatable heating member, a heat-moving member formed of material having excellent thermal conductivity characteristics and constructed so as to freely make contact with at least one rotatable member among the rotatable heating member and the rotatable pressure member, and a drive unit to move the heat-moving member between a contact position and retracted position relative to at least one of the heating member and the rotatable pressure member. The heat-moving member changes either heat capacity or thermal conductivity or both heat capacity and thermal conductivity relative to the axial direction of the rotatable heating member or the rotatable pressure member.
摘要:
The induction-heating apparatus of this invention contains a conductive member, a power source, and a first and a second induction coil connected to the power source and adapted for causing the conductive member to generate an induced current, the first and the second induction coil being parallelly connected. The induction coil is formed by winding a copper wire round a core in such a manner that the numbers of turns of the copper wire gradually decrease from the lowermost layer approximating most closely to the core to the upper layers. This heating apparatus has the thickness of the induction coil in the range of 0.2-0.8 mm. The gap between the induction coil and the conductive member is in the range of 0.5-4.0 mm. This heating apparatus has the induction coil thrust out of the conductive member. The induction coil is formed of a Litz wire.
摘要:
An apparatus for automatically mounting an electronic device having a plurality of leads on a printed circuit board, by inserting the leads into mount holes of the printed circuit board. A plurality of extension pins are connected straight to the leads to hold the leads of the electronic device. The extension pins are inserted into the mount holes, while the connection between the extension pins and the leads is maintained. The extension pins are then removed from an opposite side of the printed circuit board, thus guiding and inserting the tips of the leads into the mount holes.
摘要:
An electronic component selection and supply apparatus for use in an automatic electronic component inserting machine for automatically inserting electronic components of irregular shapes which are unsuitable for taping, such as electrolytic capacitors, power transistors and variable resistors, into a printed circuit board includes selection and supply apparatus for selecting an electronic component at a first position and supplying the selected component to a second position, the apparatus including electronic component sequence apparatus for selecting a predetermined electronic component which includes a device for vertically holding a plurality of electronic component magazines accommodating the electronic components at predetermined positions in a stacked state, and chuck apparatus for receiving the predetermined electronic component selected by the electronic component sequence apparatus and for supplying the electronic component to the second position.