Abstract: A multistage fine-hole machining device has lap stations for lapping an inner surface defining a through-hole of a workpiece. Each of the lap stations has a passing unit for passing wire through the through-hole of the workpiece, a supply unit for supplying a polishing material to the wire, and a sliding unit for effecting relative sliding movement between the workpiece and the wire while the wire is passed through the through-hole of the workpiece and is supplied with the polishing material to thereby lap the inner surface of the workpiece with the polishing material and enlarge the diameter of the through-hole. A transfer device successively transfers the workpiece to each of the lap stations to lap the inner surface of the workpiece at each of the lap stations during the lapping operation for successively enlarging the diameter of the through-hole to a preselected diameter.

Abstract: To provide a multistage fine hole machining device capable of performing fine hole machining with high precision without edge sagging and non-uniformity of a hole in a short cycle time. A plurality of fine hole lap stations for passing a wire through a hole of a workpiece and lapping the hole with a polishing material between the hole and the wire are placed, and the workpiece is successively transferred to fine hole lap stations in which the thickness of a wire is increased gradually, whereby a hole diameter is enlarged to obtain a desired diameter.

Abstract: A printer has a printer body, a carriage for undergoing scanning movement over a print paper in a scanning direction, and a cassette removably connected to the printer body for storing print paper and having a code element indicative of photosensitive characteristics of the print paper. The print paper contains photosensitive microcapsules encapsulating a color developing material and a photo-curing material and has an image receiving layer for developing color by a reaction of the color developing material with the image receiving layer. The carriage has a light emitting element for emitting light of a preselected wavelength to which the photosensitive microcapsules are exposed to thereby form a latent image on the print paper. A photosensitive characteristics identifying mechanism is disposed on the carriage for reading the code element of the cassette to identify the photosensitive characteristics of the print paper.

Abstract: A sheet feeding device has suction cups carried by a linkage which is driven by a drive motor to sequentially press the suction cups onto a paper sheet, transfer the sheet held by the suction cups to another location, and release the sheet from the suction cups. The drive motor is connected to the linkage through a firction gearing mechanism which, through frictional slippage, prevents the suction cups from exerting excessive pressure on the sheets.