Abstract: A magnetic tape cassette comprises an upper half casing and a lower half casing provided with a screw holder having a threaded hole at the corner of the lower half casing for connecting said upper half casing, wherein the thickness of the wall of the screw holder facing inside the casing is reduced and at least one rib having a level flush with the fitting surface of the lower half casing is formed at the inside portion of the screw holder.

Abstract: A case for holding a magnetic tape cassette has flat locking projections or tabs upright from the inner wall surface thereof to engage the hubs of the magnetic tape cassette and thereby lock the hubs unrotatably. The locking tabs are formed with a step each in the upper part. The step of each said tab is parallel or inclined to the place of the inner wall surface.

Abstract: A tape cassette including a pair of plates having a pair of bent portions each for holding magnetic tape and reel hubs on which the magnetic tape is wound. A plurality of cut portion are formed in each of the bent portions for defining portions facing the reel hubs, such portions projecting toward the reel hubs so as to be in contact with the reel hubs.

Abstract: The sheet separation apparatus for separating a transfer sheet from a toner image bearing photoconductor for use in an electrophotographic copying machine comprises a plurality of separators which are rotatably mounted on a shaft arranged parallel to the photoconductor, and each of the separators is independently urged into pressure contact with the surface of the photoconductor by a spring member through a control member which is substantially integral with the shaft. In one embodiment of the sheet separation apparatus, the control member serves as a protector for preventing toner particles from being scattered from the surface of the photoconductor and in another embodiment of the sheet separation apparatus, the shaft can be turned about a predetermined point of one end portion of the shaft in the direction that the other end portion of the shaft can be moved away from the photoconductor for easy maintenance of the sheet separation apparatus.

Abstract: A magnetic tape cassette in which a cassette housing has half cases with aligned, confronting projections on innder surfaces thereof on which a cylindrical guide roll with an axial bore therethrough is supported, has an annular, axially projecting rib on either the guide rolls or the projections so as to prevent any burrs which may be on the guide roll around the axial bore therethrough from coming into contact with the projections, thereby preventing noise which might otherwise be caused by the burrs.

Abstract: A tape cassette comprises an upper half casing and a lower half casing and male hollow cylindrical projections having a notch mounted on either of the upper half casing or the lower half casing and female hollow recesses mounted on the other half casing at the corresponding positions. The upper and lower half casings are superposed to fit the male hollow cylindrical projects into the corresponding female hollow recesses and are fixed together by screwing self-tap bolts from the female hollow recesses into the male hollow cylindrical projections having notches to fix the projections on the inner surfaces of the female hollow recesses.

Abstract: A variable focus objective lens having a magnification range in the order of 1 : 30 and greater and having two pairs of relatively movable members which objective consists of a front assembly and a rear assembly which includes one of the two pairs of movable members to which consecutive zooming movement is imparted. This is done in order to add a varifocal range to a varifocal range of zooming movement of the movable members of the front assembly, in association with a control mechanism of simple structure incorporated in barrels of the lens mount therefor.

Abstract: A hub for winding a magnetic tape thereon comprises a clamp for retaining one end of a magnetic tape. The novel tape clamp comprises a substantially rigid upper web, a resilient lower web and a pair of legs depending from the ends of the upper web and connected to the ends of the lower web. The lower web supplements the resilient force of the legs. As the upper web is not subjected to a stress, the magnetic tape is wound properly on the upper web.