摘要:
A stencil printing apparatus in which the generation of discharge sheet peeling problems and defects such as creasing and tear of the stencil base sheet can be prevented while printing on a coated sheet. When a printing sheet set in a sheet-feed device is indicated by input via a sheet-type input device as a coated sheet, or when a printing sheet set in a sheet-feed device is automatically detected by a sheet-type detection device as a coated sheet, a control device judges on the basis of a detected signal from the base-sheet type detection device whether or not the stencil base sheet type set in the platemaking apparatus is for coated sheet printing, and permits platemaking start if the stencil base sheet is for coated sheet printing and issues a warning without permitting platemaking start if the stencil base sheet is for non-coated sheet printing.
摘要:
A printer of the present invention includes a print drum around which a master made by cutting a stencil is to be wrapped, an ink feeding device for feeding ink to the master wrapped around the print drum and a pressing member for pressing a sheet relatively to the print drum to thereby print an image on the sheet. The operator of the printer is capable of selecting either one of a usual print mode and a silence print mode that give priority to image quality and noise reduction, respectively.
摘要:
A mimeographic printing machine equipped with a sorter for moving a plurality of bins to sort printed sheets, comprises: speed set-up means for setting up a desired print speed; sorter mode set-up means for setting up the sorter for the sort mode; and control means for changing the print speed, which is set up by the speed set-up means, to a predetermined print speed so as to conform to the sorting of the sorter, when the sort mode is set up in the sorter mode set-up means.
摘要:
A tandem dual-head lithographic duplicator is equipped for operation in alternative modes, i.e., either for duplexing by printing on opposite faces of the copy sheets in sequence, or for simplexing. In the simplexing mode the printing of the copy sheets is carried out on one head simultaneously with the cleanup and preparation operations on the other head, with a sequence of printing jobs being performed alternately on one printing head and then on the other while, in each case, the non-printing head is being prepared. Accordingly, substantially continuous simplexing operation can be achieved except in the case of very short printing runs.
摘要:
A control shaft for an offset printing machine, provided with cams, levers and the like for controlling the various operations during a printing cycle, is provided with a knob for manual rotation and with a ratchet wheel for step-by-step rotation by a pawl oscillated cyclically by a cam rotatable with one of the cylinders of the printing machine. The ratchet wheel has a number of switching ratchet teeth corresponding to the number of switching stages of the printing machine. Certain of the ratchet teeth have a sawtooth shape whereby, when engaged by the pawl, the ratchet wheel is advanced by one step. Other teeth of the ratchet wheel have a special shape including a protuberance on the flank leading to the radial portion of the tooth normally engaged by the pawl. These protuberances cause the pawl to travel out of its normal path of movement when engaged with one of these special form teeth. A spring biased locking disc is arranged adjacent the pawl and is axially displaceable by energization of an electromagnet. The locking disc is biased to engage beneath the ratchet pawl, when the pawl is displaced out of its normal path of movement due to engagement with a tooth of special shape, and the locking disc thereby prevents engagement of the pawl with the next succeeding tooth of the ratchet wheel even though the pawl continues to be oscillated. When the electromagnet is energized, the locking disc is axially displaced from its pawl blocking position, against the bias of a spring, allowing the pawl to again cooperate in a normal manner with the teeth of the ratchet wheel.
摘要:
A printed copy sheet number read-out device adapted for use with an offset printing machine which permits one master plate after another to be automatically mounted on its master cylinder. Each master plate to be duplicated by this machine is provided in one marginal portion thereof with a plurality of sets of timing marks each set representing the column of the number of copy sheets to be printed and data marks each being provided for one set of timing marks and placed above one timing mark of each set which represents the particular numeral in each column. When one of such master plates is mounted on the master cylinder, the marks are automatically read by read-out means provided in the printing machine and duplication of the particular master plate is automatically terminated when a predetermined number of copy sheets have been printed.