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1. 发明授权

US4813802A Device for verifying if thermal printer is operating correctly 失效
标题翻译：用于验证热敏打印机是否正常运行的设备
公开(公告)号：US4813802A
公开(公告)日：1989-03-21
申请号：US92546
申请日：1987-09-03
申请人： Dennis T. Gilham , Raymond J. Herbert
发明人： Dennis T. Gilham , Raymond J. Herbert
IPC分类号： B41J2/36 , B41J2/375 , G07B17/00 , G07C3/10 , B41J1/20
CPC分类号： G07B17/00508 , B41J2/36 , B41J2/375 , G07C3/10 , G07B2017/00338 , G07B2017/0054
摘要： A method and apparatus is described for checking the operation of a thermal dot printer during a printing cycle. When a pattern is to be printed a count of the number of printing elements intended to be operated in the cycle is stored. A signal indicative of the total current drawn from a supply by the operated printing elements is compared with the stored count. If the comparison indicates that all or a sufficient number of elements have been operated to effect printing, operation of the printing elements in further printing cycles is permitted otherwise further printing is inhibited. In an alternative method the printing elements are operated to print data in machine readable form and the data is read to produce a signal which is compared with data intended to be printed. The printing elements may print the data in a form for visual inspection and in machine readable form. The printer may form part of a franking machine in which the printed data is a franking of a mail item.
摘要翻译：描述了一种用于在打印周期期间检查热点打印机的操作的方法和装置。当要打印图案时，存储要在该循环中操作的打印元件的数量的计数。指示由所操作的打印元件从电源抽取的总电流的信号与存储的计数进行比较。如果比较表示全部或足够数量的元件已经被操作以进行打印，则允许打印元件在进一步的打印循环中的操作，否则进一步的打印被禁止。在替代方法中，打印元件被操作以以机器可读形式打印数据，并且读取数据以产生与要打印的数据进行比较的信号。打印元件可以以用于目视检查和机器可读形式的形式打印数据。打印机可以形成打印机的一部分，其中打印的数据是邮寄邮件的邮票。

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