Typewriting machines – Including adjustment for optimum printing plane
Patent
1996-06-04
1998-02-03
Eickholt, Eugene H.
Typewriting machines
Including adjustment for optimum printing plane
400 56, B41J 1120
Patent
active
057136742
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Field of the Invention
The present invention relates to a paper feed method and apparatus for a printer provided in an information processor in which a sheet of continuous-form paper and sheets of cut-form paper are used. The present invention also relates to a paper feed unit, which is provided in an information processor such as a printer, image scanner or facsimile device, for feeding sheets of paper stacked on a paper feed tray by a frictional force of a paper feed roller one by one. The present invention also relates to an adjusting device for adjusting a head gap between a platen and a printing head of the printer.
The present invention also relates to a printer having a sound insulating mechanism which insulates noise made by a noise source in the printer such as an impact head and also having a sheet entrance through which a recording medium such as a recording sheet or a film sheet is supplied.
2. Background Art
When a large amount of data is outputted from a printer provided in an information processor, sheets of continuous form paper are usually used, because there is little possibility of the occurrence of a paper jam or a failure in feeding sheets of paper. On the other hand, sheets of cut-form paper are used in usual office work. Various documents, the amount of data of which is small, are output on the sheets of cut-form paper. When a sheet of continuous-form paper is to be changed in the printing process, the sheet of paper is reversely fed. In this case, it is necessary to prevent the sheet of paper from slackening.
There is provided a paper feed mechanism of a printer in which a drive roller is mounted on a printer body, and an idle roller is mounted on a paper guide detachably attached to the printer body, and the idle roller comes into pressure contact with the drive roller so as to feed sheets of paper. Since the sheet of continuous-form paper is fed by a tractor, that is, by the action of pins, it is sufficient to give a weak force to the idle roller so as to pull the sheets of paper. When the pushing force is strong, sprocket holes are damaged and the tractor is disengaged from holes. When thick sheets of cut-form paper such as postcards are used, it is necessary to increase a pushing force of the idle roller so as to prevent the occurrence of a slippage. Concerning the pushing force of the idle roller, sheets of continuous-form paper and cut-form paper are incompatible with each other. Therefore, it is necessary to change over the pushing force according to the type of sheets of paper.
When a line feed operation is conducted in a conventional printer, in order to ensure a sheet passage for feeding sheets of paper stably, an amount of the gap formed between a printing head and a platen is increased to a predetermined value. However, when sheets of continuous-form paper are processed, on which perforations are formed in the boundary between pages, the perforations protrude from a surface of the sheet of paper. In this case, the printing head is caught by the perforations in the process of line feed, and the accuracy of line feed is deteriorated.
When sheets of cut-form paper are fed, sheets of paper stacked on the paper feed tray are sent out one by one. As a means for sending out sheets of paper one by one, there is provided a paper feed roller which comes into contact with a surface of the stacked sheet of paper and rotates to send them one by one. This type paper feed roller is commonly used. In a business machine, sheets of paper of various widths are used. Accordingly, in order to feed sheets of paper of various widths by one paper feed unit, a plurality of relatively short roller pieces are mounted on one roller shaft in accordance with the widths of the sheets of paper.
In the case of a printer, an OCR (optical character reader) or an image scanner in which the printing position and reading position of information must be accurately set, and all sheets of paper of different widths are guided by a reference side guide arranged at a stationary position on the pape
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Asai Hitoshi
Hongawa Hironaga
Matsue Yasuhiro
Matsumoto Masashi
Mukaiyama Hirohito
Eickholt Eugene H.
PFU Limited
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