Abstract: A cylinder head includes a carrier member 50 integrally formed with a vertical wall portion 53 for supporting a camshaft 15, 16, a tappet guide 54 for containing a tappet 24 and a tappet-lubricating oil receiving portion 51 slanted around the tappet guide 54. An operation-oil supply passage 203, 209, 210 extends in the longitudinal direction of the carrier member 50 inside the tappet guide 54.

Abstract: A valve drive mechanism includes a generally cylindrically shaped tappet assembly (24) comprising a center tappet (41 ) and a side tappet (42). The center tappet (41 ) has a circular-arcuate side walls (41c) formed with vertical side shrouds (41d) at opposite sides of each side wall (41c) which overlap and slide contact with opposite end guide walls (42h) of the side tappet (42), respectively. When the tappet assembly (24) is in an unlocked state so as to transmit rotation of the side cams (25, 27), the vertical side shroud (41d) of the center tappet (41 ) slide on the vertical side walls (42h) of the side tappet 42 so as thereby to guide slide movement of the center tappet (41) relative to the side tappet (42).

Abstract: A valve drive mechanism includes a generally cylindrically shaped tappet assembly (24) comprising a center tappet (41 ) and a side tappet (42). The center tappet (41 ) has a circular-arcuate side walls (41c) formed with vertical side shrouds (41d) at opposite sides of each side wall (41c) which overlap and slide contact with opposite end guide walls (42h) of the side tappet (42), respectively. When the tappet assembly (24) is in an unlocked state so as to transmit rotation of the side cams (25, 27), the vertical side shroud (41d) of the center tappet (41 ) slide on the vertical side walls (42h) of the side tappet 42 so as thereby to guide slide movement of the center tappet (41 ) relative to the side tappet (42).

Abstract: A valve drive mechanism includes a tappet assembly which comprises a center tappet, a pair of side tappets between which the center tappet is interposed so as to move relatively to the side tappets, and a locking/unlocking mechanism operative to mechanically couple the center tappet to both of the side tappets and to uncouple the center tappet from both of the side tappets so as to selectively transmit rotation of a high lift center cam and low lift side cams to twin valves such as twin intake valves and twin exhaust valves per cylinder. Locking/unlocking of the center tappet and each side tappet is performed in a position which is in a vertical plane including a center axis of each side tappet and intersecting perpendicularly to an axial direction of a camshaft and is offset from the center axis of the side tappet.

Abstract: A cylinder head includes a carrier member 50 integrally formed with a vertical wall portion 53 for supporting a camshaft 15, 16, a tappet guide 54 for containing a tappet 24 and a tappet-lubricating oil receiving portion 51 slanted around the tappet guide 54. An operation-oil supply passage 203, 209, 210 extends in the longitudinal direction of the carrier member 50 inside the tappet guide 54.

Abstract: An electrophotographic copying machine of a type having a drum for supporting a document to be copied therearound and being provided with an automatic document feeder adapted to carry out a preliminary copying operation for testing includes a timer for counting up a predetermined period of time after the completion of preliminary copying, or is alternatively so programmed that a choice can be made after a preliminary copying operation whether a document remaining in the copying position should be ejected. Jamming of documents and injury to the copying machine can be avoided effectively thereby.

Abstract: A manual or handy type copying apparatus including an image reading section for reading an image of an original document to be copied, and a printing section for printing the image read by the image reading section onto a transfer material, and arranged to subject the printing section to manual scanning during the printing operation or work, with the printing portion held in contact with the transfer material, and characterized in that there are provided spring members adapted to support the printing portion in a floating state so that the printing portion contacts the transfer material under a constant pressure during the printing operation.

Abstract: A copying machine with a power saving mode that can be canceled automatically in response to any one of the operations relating to the start of the copying operation, such as placing a manuscript on the copy machine platen, closing a cover on a manuscript or pressing the copy start button, so as to enable rapid copying while reducing copying time.

Abstract: A magnification variable type electrophotographic copying machine includes a memory for storing a plurality of magnification scales of an original to be copied, a counter for counting the frequency of use for each of the plurality of magnification scales, and a display for displaying the magnification scale with the highest frequency of use when the copying machine is in a magnification variable mode.

Abstract: An electrophotographic copying machine including a copy enabling device, a mode switch, a detection device, and a control device. The mode switch is actuated to select an independent dual copy mode for independently copying two copy documents mounted on two halves of a document table. The detection device is responsive to the mode switch for detecting which copy information relates to either of the two copy documents. The control device is responsive to the detection device for selectively controlling execution of the independent dual copy mode.