Sheet feed control device and method in a printer with a tear bar
AssigneeBrother Kogyo Kabushiki Kaisha
InventorsYoshiyuki Karube, Masaaki Hori
Life of this patent
Estimating the term…
Abstract
In a printer of the kind which uses a continuous form print sheet having a plural pages each defined by perforated score lines formed in the widthwise direction of the sheet, a sheet feed control device is provided for controlling a sheet feed means for feeding the sheet. The control device includes a central processing unit which upon measuring a first line distance on the sheet, controls a sheet feeding means so that the perforated score line in the bottom of a printed page is brought in coincidence with a sheet cutting position. The print sheet can thus be separated at the line of perforations even if the first line distance is differently than that of the previous sheet.
Claims19
A sheet feed control device in combination with a printer of the kind including feeding means for moving a print sheet in a sheet feeding direction along a sheet passageway, said printer sheet having a leading edge, and said sheet passageway having first, second, third and fourth positions, said second position being downstream with respect to said sheet feeding direction of said first position and said third and fourth positions being upstream with respect to said sheet feeding direction of said first position, a platen disposed alongside of said first position for supporting said print sheet, a print head disposed alongside of said first position to confront said platen and bidirectionally movable along said platen for carrying out printing on sasid print sheet supported on said platen, and a tear bar disposed alongside of said second position, said device comprising:
- indexing means, disposed alongside of said third position, for indicating to an operator the initial print position of a preselected line;
- detection means disposed alongside of said fourth position for detecting a presence of said print sheet and producing a sheet presence signal;
- measuring means responsive to said sheet presence signal for measuring a distance L4 between said fourth position and a position of said leading edge when said print sheet is placed in a position where said preselected line is positioned to said third position and outputting a distance signal;
- and
- a control means for controlling said feeding means in accordance with distances L1 between said first position and said third position, L2 between said first position and said fourth position, and L3 between said first position and said second position and said distance L4, said control means comprising a first control means for controlling said feeding means to move said print sheet to a position where said preselected line is in coincidence with said first position and a second control means for controlling said feeding means to move said print sheet to a position where said leading edge of said print sheet projects over said second position by a predetermined length.
A sheet feed control device in combination with a printer of the kind including feeding means for moving a print sheet in a sheet feeding direction along a sheet passageway, said print sheet being in a continuous form connecting a plurality of segmental sheets in succession at respective boundary lines and having a leading edge, and said sheet passageway having first, second, third and fourth positions, said second position being downstream with respect to said sheet feeding direction of said first position and said third and fourth positions being upstream with respect to said sheet feeding direction of said first position, printing means disposed alongside of said first position for carrying out printing on said print sheet, and a tear bar disposed alongside of said second position, said device comprising:
- indexing means, disposed alongside of said third position, for indicating to an operator the initial print position of a preselected print line;
- detection means disposed alongside of said fourth position for detecting the leading edge of the print sheet;
- measuring means for measuring a print sheet moving distance L4 which a sheet is moved by said feeding means from a position where the preselected print line is in coincidence with the third position to a position where the leading edge of the print sheet is detected by said detection means;
- and
- control means for controlling said feeding means in accordance with distance L2 between said first position and said fourth position and L3 between said first position and said second position, said control means controlling said feeding means to move said print sheet to a position where its respective boundary line is in coincidence with said second position.
In a printer of the kind including feeding means for moving a print sheet along a sheet passageway, said print sheet having a leading edge and being in a continuous form connecting a plurality of segmental sheets in succession at respective boundary lines, each segmental sheet having a predetermined length, and wherein printing is carried out from a preselected line in each of said segmental sheets, and said sheet passageway having first, second, third and fourth positions, said second position being downstream of said first position and said third and fourth positions being upstream of said first position, printing means disposed alongside of said first position for carrying out printing on said print sheet, a tear bar disposed alongside of said second position, an indexing member disposed alongside of said third position, and control means for controlling said feeding means, a feed control method of said print sheet comprising the steps of:
- (a) manually aligning said preselected line of a first segmental sheet of its respective print sheet to said indexing member at said third position;
- (b) measuring a distance L4 between said fourth position and said leading edge;
- (c) moving said print sheet to said first position;
- and
- (d) moving said print sheet in accordance with said distance L4 being measured in said step (b) until said boundary line is in coincidence with said second position.
Dependencies are inferred from the claim text.