Abstract: In a cylinder sleeve assembly comprising a plurality of cylinder sleeves whose adjacent cylindrical peripheral walls are coupled to each other, a plurality of sink mark inhibiting projections biting into the cylinder sleeve assembly during casting a cylinder block are provided in each of valley-like areas of an outer peripheral surface of the cylinder sleeve assembly which are located on opposite sides of a coupled portion of the adjacent peripheral walls. Thus, the adhesion between the cylinder barrel assembly and the cylinder sleeve assembly is enhanced. In addition, the adhesion is further enhanced by providing a predetermined inclination to each of the sink mark inhibiting projections.

Abstract: An Electric stapler of the type in which a magazine is unmovably fixed, characterized in that the magazine is secured to a body frame; a driver for driving out a staple is supported by the magazine so that the driver can be rectilinearly reciprocated; a clincher, which receives the staple driven out by the driver, is supported by the frame so that the clincher is located to face the driver and can be reciprocated on the production of the direction of the reciprocation of the driver; the driver is coupled to drive links at one end of each thereof; the links are supported by the frame so that the links are swingable; the clincher is coupled to a clincher lever at one end thereof; the lever is supported by the frame so that the lever is swingable; the links and the lever are associated at the other ends thereof with a drive control cam, which is rotated by an electric motor; and the driver and the clincher are nearly simultaneously moved toward and away from each other in mutually opposite directions through the

Abstract: The driving system which drives and rotates a flexible-disc to and from which information is written in and read out by means of a magnetic head. On the top of a driving hub the flexible-disc is attached in a detachable manner, and at the bottom part of the driving hub a driving axle is directly connected coaxially. The lower end of this driving axle itself forms the rotating axle of a direct current magnetic motor. The rotation of this motor is controlled by a rotating speed controlling system so as to rotate at speed identical to any given designated velocity.