Abstract: A tubular film manufacturing method includes the steps of winding a sheet film on a cylindrical member, cutting a winding end portion of the sheet film, and inserting the cylindrical member, on which the sheet film is wound, into a tubular mold member. The sheet film is molded into a tubular film by heating. In the inserting step, the cylindrical member is inserted into the tubular mold member while the winding end portion of the sheet film is pressed by an elastically deformable brush member.

Abstract: An image forming apparatus is provided with an endless belt conveying a sheet and a drive roller and driven roller supporting the endless belt. A brake is provided for the driven roller and the drive roller is driven by a drive unit which is controlled so as to repeat driving status and stopping status thereof mutually and to make the brake work when the driving unit is at the stopping status.

Abstract: A sheet convey apparatus and a printer having such a sheet convey apparatus have rock arms rockable around a rotational center of a driven roller on which an endless belt is supported. Urging roller attaching plates for supporting the urging roller, a transmission shaft, urging roller driving arms and urging cylinders are attached to the rock arms, and the urging cylinders can abut against the corresponding urging roller driving arms. Urging force releasing springs are connected between the urging roller driving arms and the rock arms. When the urging cylinders are extended, the urging roller is urged against the endless belt, and, when the urging cylinders are retracted, the urging force of the urging roller is released. In this way, a sheet urging force is kept constant to eliminate unevenness of the contact between the sheet and the endless belt, and any streak is prevented from being formed on the sheet.

Abstract: Two roller members support an endless conveying member tensioned around them, where the endless conveying member conveys a printing medium. A first displacing unit displaces a first portion of the endless conveying member in the direction different from the traveling direction of the endless conveying member and a second displacing unit displaces a second portion of the endless conveying member opposite to the first portion in accordance with the displacement of the endless conveying member made by the first displacing unit. The first displacing unit is arranged to displace the portion of the endless conveying member which faces the printing head.

Abstract: In a noise eliminating apparatus including a recursive filter having a delay circuit to delay a video signal by only a predetermined period of time, each of recursive coefficients of a plurality of spatial frequency components included in the difference signal between the input video signal and the delayed video signal is changed in accordance with a movement detection output based on the difference signal. Thus, the dimming due to the motion of an image can be reduced to such a level that no visual problem occurs and the high frequency noises are also eliminated because of the correlation between the frames. Therefore, the dimming phenomenon due to the motion of the image in the moving portion can be reduced and the sufficient noise elimating effect can be obtained.

Abstract: The output of a phase comparator in the PLL of the data reproduction unit is filtered to remove low frequency components which may be due to record eccentricity. The filtered output is then rectified and integrated, with the level of the integrated signal determining whether the PLL should be operated in a broad or narrow band state.