Abstract: A method for transporting an ink-jet head in an ink-jet printing system to the home position by use of driving voltage charged in the ink-jet printing system in the ink-jet printing system when power supply is cut off. The method for transporting the ink-jet head in the printing system to the home position when the power supply is cut off, by charging a storage unit with power from a power supply, when a level of the voltage drops to less than a reference voltage level during the printing operation, by stopping the printing operation, and transferring the ink-jet head to its home position by use of the storage units charged voltage.

Abstract: An extension guide unit 30 is provided on a side portion of a recording medium conveying passage. An extension guide 36 is held in a wound state in an extension guide holder 31 of the extension guide unit 30. In order to convey a recording medium, the extension guide 36 is drawn out, by which the recording medium is guided. This enables the recording medium to be smoothly conveyed.

Abstract: A print head drive mechanism and cooperating positioning assembly are provided. In one embodiment, the print head drive mechanism comprises a lead screw that is coupled to the print head and extends through the threaded hub of a gear. The gear is driven by a stepper motor through a pinion. The thread pitch of the lead screw matches the jet spacing in the print head to minimize positional offsets due to component irregularities and misalignments. A support cylinder extends from one face of the gear and includes a tapered nose that seats within a recess in a brace. The brace cooperates with two spaced apart legs to form a positioning assembly that is essentially non-extensible in an X-axis direction but freely pivotable in a direction perpendicular to the X-axis.

Abstract: A printing apparatus connected to a data processing device includes a printing section having a printing head, a detector for detecting the moving velocity of the printing head and a control circuit integrally incorporated therein. The control circuit serves to control the print driving pulse width and the drive timing of the printing head. If the printing section is manually moved to perform scanning on a paper sheet, the drive timing of the printing head is changed by the control circuit to correspond to the moving velocity of the printing head relative to the paper sheet so as to perform printing based on the printing data supplied from the data processing device. Every time a carriage return code or a line feed code is detected from among the printing data, the printing head is brought back to the print starting position on the left side, and the printing line is shifted by one line.

Abstract: The disclosure relates to a printing device which includes so-called hot zones wherein a punctuation or hyphenation is automatically performed in accordance with a predetermined rule thereby letting users be free from the inconvenience of line end arrangements and also enabling users to pay attention to the text printed on the sheet when attention is needed for a particular format, since the printing is ordinarily conducted at least before the hot zone.

Abstract: Disclosed is a precision printhead transport apparatus. The apparatus includes a differential wheel rotatably mounted upon belt or a printhead carriage which is constrained to move along a printing path. A first portion of an endless belt or band is looped around a first portion of the differential wheel having a first radius and a second portion of the band is looped around a second portion of the differential wheel having a second radius. The band further passes around two pulleys positioned on opposite sides of the differential wheel, one of the pulleys being an idler pulley and the other a driven pulley. A course stepping motor drives the driven pulley and the action of the differential wheel assures that gross rotation of the driven pulley produces only small linear displacement of the printhead carriage.Embodiments disclosed include both smooth and toothed bands and the use of a pair of rigid racks in place of the endless band.

Abstract: Disclosed is a travelling control of printing head in which when a printing head is to be returned to its home position, the printing head is returned in a selected one of two modes, the first mode being such that a lead screw is reversely rotated upon completion of a desired printing operation to cause the printing head to return to its home position through a first guide groove provided for the forward travelling of the printing head and the second mode being such that the lead screw is rotated forward even after the completion of the desired printing operation and the guide groove is changed from the first one to a second one which is provided only for the return travelling of the printing head and which has a pitch larger than that of the first one so that the printing head can be quickly returned to its home position at a speed higher than that in the forward travelling.

Abstract: A serial printer having a carriage adapted to be shifted transversely of a paper and a type cylinder carried by the carriage in such a manner as to be able to be shifted up and down and to be rotated, so that the printing is effected by pressing the desired type character against the paper. The improvement comprises that the vertical shifting of the type cylinder, rotation of the type cylinder, driving of the hammer, shifting of the carriage and other kinds of operation are performed by the force derived from a single motor, and that operation such as spacing and back spacing of the carriage, paper feeding and so forth is achieved when the type cylinder selects a visible position.