Abstract: To provide a highly reliable and easy-to-manufacture ink jet head connection unit, in which ink supply paths are formed by gluing a substrate on which head component is formed to other components, that is free of ink ejection failure and ink leakage. A head component and case component 240 equipped with opening 241 on the bottom of which supply port 257 for supplying ink to head component 210 and concave area 243 to be filled with an adhesive are formed, are provided. Space 248 to be filled with an adhesive for joining head component 210 and case component 240 when case component 240 and head component 210 are coupled, is formed inside the joined case.

Abstract: An inkjet cartridge is provided in which by applying an appropriate initial pressure to an ink reservoir or sack at the start of printing does not excessively increase the pressure in an ink reservoir or sack when the remaining ink level is high, and enables effective use of the remaining ink when the remaining ink level is low. The inkjet cartridge comprises an ink reservoir for storing the recording ink, a circuit element for ejecting ink supplied from ink reservoir according to the display data from a host processor to be recorded. A head case and an ink supply case accommodating the ink reservoir. A thick-wall region of the ink reservoir is pressed by a pressure rod via a through-hole. A guide is provided to push the thick-wall region to one side of the ink reservoir is disposed in the top portion of the case or the guide is provided around the thick-wall region of the ink reservoir.

Abstract: According to the present invention, there is disclosed a capping device for an ink jet printer which is constructed such that a cap supporting member 14, adapted to move from the non-capping position to the capping position by the thrust action of a carriage 3, is arranged on the home position side of the ink jet printer so that the outer end part of the cap supporting member 14 is displaced toward the nozzle surface of a printing head 4 with the aid of a guide surface 15b having an inclined surface 15a, until a cap 5 on the cap supporting member 14 is brought into close contact with the nozzle surface of the printing head 4 with an adequate intensity of thrust force by means of a turnable lever 8 operatively connected to the inner end of the cap supporting member 14, while resilient force of a cap spring 11 is exerted on the base end part of the turnable lever 8 so as to normally bias the cap supporting member 14 in the direction toward the printing head 4.

Abstract: In an ink near-end detecting device, a pair of electrodes are arranged in the porous material in the ink tank and in the ink pool provided below the ink tank, respectively, so that the time instant the ink in the porous material has been nearly used up is detected from the variation of the electrical resistance between the electrodes with the consumption of the ink in the porous material.

Abstract: In a miniature printer including a carriage for motion along a path in linear reciprocating directions having at least one cam surface, a frame including a projection adjacent to the path and a print wheel having at least two levels of print type, a mechanism for shifting the position of the print wheel between the different print type levels. The mechanism is coupled to the print wheel and responsive to contact with the projection as the mechanism travels by the projection in shifting the print wheel position through engagement with the cam surface.

Abstract: In an ink near-end detecting device, a pair of electrodes are arranged in the porous material in the ink tank and in the ink pool provided below the ink tank, respectively, so that the time instant the ink in the porous material has been nearly used up is detected from the variation of the electrical resistance between the electrodes with the consumption of the ink in the porous material.

Abstract: A small-sized printer has a carriage moving in front of a platen. A print wheel is rotatably mounted on the carriage and coupled to a print wheel gear. The print wheel gear meshes with two worm gears which extend parallel to the platen. A rack-like cam also lies parallel to the platen and is followed by rocking lever which drives a pivoted hammer support. A pivoted hammer on the pivoted support strikes the inside of the print wheel, forcing an inked character to print on the paper, and rolling the character on the paper as the carriage moves. The two worm gears are powered by a motor which acts through a print drive. Their rotation is controlled so that the print wheel is rotated for print character selection by rotating both worm gears to turn the print wheel gear, the carriage is caused to move along the print line by stopping rotation of one of the worm gears, and the carriage is caused to return to its original position by stopping the other worm gear.

Abstract: A small-sized printer has a carriage moving in front of a platen. A print wheel is rotatably mounted on the carriage and coupled to a print wheel gear. The print wheel gear meshes with two worm gears which extend parallel to the platen. A rack-like cam also lies parallel to the platen and is followed by rocking lever which drives a pivoted hammer support. A pivoted hammer on the pivoted support strikes the inside of the print wheel, forcing an inked character to print on the paper, and rolling the character on the paper as the carriage moves. The two worm gears are powered by a motor which acts through a print drive. Their rotation is controlled so that the print wheel is rotated for print character selection by rotating both worm gears to turn the print wheel gear, the carriage is caused to move along the print line by stopping rotation of one of the worm gears, and the carriage is caused to return to its original position by stopping the other worm gear.