公开(公告)号：US5088842A

公开(公告)日：1992-02-18

申请号：US647820

申请日：1991-01-30

申请人： Noritugu Ito ,  Yuuji Kawahara

发明人： Noritugu Ito ,  Yuuji Kawahara

IPC分类号： B41J11/20 ,  B41J25/308

CPC分类号： B41J25/3088 ,  B41J11/20 ,  B41J25/308

摘要： For dot impact printers having a platen which may be installed such that the geometric central axis thereof is displaced off a rotation axis about which the platen rotates, a carriage on which a print head is mounted is moved toward the platen from a predetermined position until the distal end portion of the carriage is brought in abutment with the circumference of the platen to thereby measure the surface level of the platen. This measurement is repeatedly carried out while angularly rotating the platen. The thus measured surface levels of the platen are averaged, and based on the average data an optimum position of the print head to be located apart from the sheet of print paper supported on the platen is determined.

公开(公告)号：US5169250A

公开(公告)日：1992-12-08

申请号：US849100

申请日：1992-03-09

申请人： Yoshio Tsuru ,  Yuuji Kawahara

发明人： Yoshio Tsuru ,  Yuuji Kawahara

IPC分类号： B41J11/48

CPC分类号： B41J11/48

摘要： The invention provides an apparatus capable of automatically changing over continuous paper and cut paper, wherein manual changeover is possible even if an actuator is locked in case of an accidental paper jam, to thus facilitate a processing. A platen gear can be associated with a tractor drive gear via a clutch gear for connecting or disconnecting both gears to or from each other upon oscillation of a clutch lever. The clutch lever is oscillated by a changeover lever which is moved by a changeover cam driven by a stepping motor. Therefor, the changeover cam is manually moved under a normal condition so that the changeover of the continuous paper and the cut paper can be manually performed without any application of a load of the stepping motor.

公开(公告)号：US5131771A

公开(公告)日：1992-07-21

申请号：US736921

申请日：1991-07-29

申请人： Yuuji Kawahara

发明人： Yuuji Kawahara

IPC分类号： B41J11/00 ,  B41J11/48 ,  B41J13/20 ,  B41J23/04

CPC分类号： B41J11/48 ,  B41J11/00 ,  B41J13/20 ,  B41J23/04

摘要： A printer comprises a platen roller for supporting and feeding a cut sheet, a first motor for rotating the platen roller and a tractor for feeding a continuous paper. The tractor is capable of being connected to the first motor through the platen roller. The printer comprises a second motor having first, second and third phases based on a rotational angle. A clutch can be connected to both the platen roller and the tractor and can be disconnected between the platen roller and the tractor based on driving force from the second motor. A paper bail roller is faced with the platen and the platen bail roller can be moved between a position contacting the platen and a position separated from the platen by paper bail roller moving unit based on driving force by the second motor. The first phase of the second motor corresponds to a position where the paper bail roller is separated from the platen, the second phase of the second motor corresponds to a position where the paper bail roller contacts the platen roller and that clutch connects the platen roller and the tractor, and the third phase of the second motor corresponds to a position where the paper bail roller contacts the platen roller and that clutch disconnects the platen roller from the tractor.

摘要翻译： 打印机包括用于支撑和供给切割的片材的压辊，用于旋转压纸辊的第一电动机和用于馈送连续纸的拖拉机。 拖拉机能够通过压纸滚筒连接到第一马达。 打印机包括基于旋转角度的第一，第二和第三相的第二电动机。 离合器可以连接到压纸辊和拖拉机两者，并且可以基于来自第二电动机的驱动力将压纸辊和拖拉机断开。 纸卷筒辊面对压板，并且压板吊环辊可以基于第二电动机的驱动力在接触压板的位置和通过纸吊环移动单元与压板之间分离的位置之间移动。 第二电动机的第一相对应于纸卷筒辊与压板分离的位置，第二电动机的第二相位对应于纸吊环辊与压纸辊接触的位置，离合器连接压纸辊和 拖拉机和第二相电动机的第三相对应于纸卷轴与压纸辊接触的位置，离合器将压纸辊与拖拉机断开。

公开(公告)号：US5120145A

公开(公告)日：1992-06-09

申请号：US505065

申请日：1990-04-05

申请人： Yuuji Kawahara

发明人： Yuuji Kawahara

IPC分类号： B41J13/00 ,  B41J29/44 ,  B65H5/06 ,  B65H7/04 ,  B65H29/22

CPC分类号： B65H7/04 ,  B41J29/44 ,  B65H2511/515 ,  B65H2513/514

摘要： In a printing device having at least a pair of sheet discharge rollers for discharging a printing sheet on which a printing operation has been executed, provided are means for judging whether the printing sheet exists or not at a contact position of the pair of sheet discharge rollers, and control means for controlling the pair of rollers so as to be brought out of contact in case that the sheet does not exist at the contact position. Thus, even if the sheet is skewed or bent, it is securely nipped between the pair of sheet discharge rollers, thereby reducing occurrence of a sheet jamming.

公开(公告)号：US5027234A

公开(公告)日：1991-06-25

申请号：US275772

申请日：1988-11-17

申请人： Yuuji Kawahara

发明人： Yuuji Kawahara

IPC分类号： G11B21/08

CPC分类号： G11B21/083

摘要： A read/write head which is usually used for reading out and writing information from and into the surface of the disc and the servo information recorded on the disc as a position sensor. Servo information to be recorded on a surface of a disc to detect the deviation of the head from a normal position of each track is formed by a plurality of servo information portions and the servo information regarding to a reference track is made different from the servo information of other tracks. A plurality of numerical values indicative of the servo information portions are detected from the signal read out by the head. In accordance with the detected values, the reference track is designated.

摘要翻译： 通常用于从盘表面读出信息并将记录在盘上的伺服信息作为位置传感器读写的读/写头。 要被记录在盘表面上的伺服信息由多个伺服信息部分形成以检测头部与每个轨道的正常位置的偏差，并且使与伺服信息有关的伺服信息不同 的其他曲目。 从头读出的信号检测表示伺服信息部分的多个数值。 根据检测值，指定参考轨迹。

公开(公告)号：US4990004A

公开(公告)日：1991-02-05

申请号：US419592

申请日：1989-10-10

申请人： Yuuji Kawahara ,  Atsushi Murakami

发明人： Yuuji Kawahara ,  Atsushi Murakami

IPC分类号： B41J25/308

CPC分类号： B41J25/3088

摘要： A printer having a device for advancing and retracting a print head toward and away from a paper supporting platen, an automatic head gap adjusting device for controlling the head advancing and retracting device, to advance the print head until the print head comes into contact with a recording paper, and then retracting the print head by a predetermined distance, to thereby adjust a head gap between the paper and the print head, and an operator-controlled head gap adjusting device for manually operating said head advancing and retracting device, to thereby adjust the head gap. A mode selector is provided for selecting one of an automatic adjusting mode in which the head gap is adjusted by the automatic head gap adjusting device, and a manual adjusting mode in which the head gap is adjusted by the operator-controlled head gap adjusting device.

摘要翻译： 一种打印机，具有用于使打印头朝向和远离纸张支撑压板前进和后退的装置，用于控制头部前进和后退装置的自动头部间隙调节装置，以使打印头前进直到打印头与 记录纸，然后将打印头缩回预定距离，从而调整纸张与打印头之间的打印头间隙，以及操作者控制的打印头间隙调节装置，用于手动操作所述打印头前进和后退装置，从而调整 头差。 提供了一种模式选择器，用于选择通过自动磁头间隙调节装置调节磁头间隙的自动调节模式中的一种，以及由操作者控制的磁头间隙调节装置调节磁头间隙的手动调节模式。

公开(公告)号：US5137377A

公开(公告)日：1992-08-11

申请号：US648860

申请日：1991-01-31

申请人： Noritugu Ito ,  Yuuji Kawahara

发明人： Noritugu Ito ,  Yuuji Kawahara

IPC分类号： B41J29/377 ,  B41J2/30 ,  B41J25/308

CPC分类号： B41J25/3088

摘要： In dot impact printers, a platen or a print head may be thermally expanded or contracted due to heat generated from a driver of a print head, with the result that a gap between the print head and a sheet of print paper on the platent varies. In order to maintain a proper gap therebetween regardless of the thermal deformation of the platen and/or print head, a temperature sensor is provided for sensing the temperature of the platen or the print head, and the gap therebetween is adjusted based on the sensed temperature. This adjustment is performed each time when a number of printed characters have reached a predetermined number.