Abstract: A method of making a magnetic recording medium by forming a recording layer composed of a ferromagnetic material on a strip-like substrate comprises a first step of applying the ferromagnetic material onto the surface of the substrate, a second step of drying the ferromagnetic material applied on the surface of the substrate, a third step of grinding the surface of the dried recording layer on the substrate, a fourth step of removing process grains clinging to the ground surface of the recording layer, and a fifth step of calendering the surface of the recording layer from which the process grains have been removed.

Abstract: A method of making a magnetic recording medium comprises a first step of polishing a surface of a strip-like magnetic recording medium composed of a substrate and a magnetic layer formed on a surface of the substrate by coating a magnetic material onto the surface of the substrate and drying the coated magnetic material, a second step of inspecting the polished surface of the magnetic recording medium for defects, and a third step of punching out the magnetic recording medium, on which the inspection for defects is finished, into a predetermined shape. The first step, the second step and the third step are carried out on the continuous strip-like material.

Abstract: A magnetic recording disk cartridge comprises a magnetic disk unit rotatably accommodated in a casing.

Abstract: An apparatus for cutting a continuously horizontally moving web into desired lengths comprises a first slider crank mechanism 21 for horizontally reciprocating a first slider 71 mounting relatively reciprocable cutting edges 81, 82 disposed below and above the web, a second slider crank mechanism 22 for vertically reciprocating the upper cutting edge 82 via a second slider 72 to sever the web, and a third slider crank mechanism 23 for horizontally reciprocating a third slider 73 mounting a torque balancing weight 83. All three mechanisms are driven by a common rotary shaft 13, and the angles between the crank arms of the mechanisms and the magnitude of the balancing weight are selected such that the shaft torque is substantially constant over the cutting region whereat the first slider moves at a substantially constant speed approximately equal to that of the travelling web.