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US 4,360,279 AGranted
Printing paper feeding mechanism
AssigneeBrother Kogyo Kabushiki Kaisha
InventorToshiro Sugiura
Life of this patent
Estimating the term…
Abstract
A printing paper feeding mechanism for a printer having a pin tractor for feeding a web with holes perforated at periodic locations along both edges and a pair of rollers for drawing out the web fed by the pin tractor through a printing position while pinching the web under pressure. The pin tractor and one of the rollers are driven by a motor through a transmitting device such that the rollers are imparted a slightly faster feeding action than the pin tractor for preventing the web from being slackened. The rollers are adapted to be used independently of the pin tractor for feeding a cut sheet paper at the same speed as the web fed by the pin tractor by driving the motor at a reduced amount of rotation for a unit line spacing amount than usual.
Claims11
A printing paper feeding mechanism for a printer comprising:
- a perforated paper feed device provided with a pin tractor, for feeding a web with holes perforated at periodic locations along both edges toward a printing position, fittable into said perforations;
- a paper draw-out device comprising a rotatable drive roller and a pressure roller, abuttable thereto for being able to rotate associated therewith, for drawing out a paper printed at the printing position therefrom while holding said paper under pressure between both rollers;
- a transmitting device for connecting said perforated paper feeding device and said paper draw-out device to impart larger amount paper drawing out action to said paper draw-out device than paper feeding amount by said perforated paper feed device;
- a motor for driving said perforated paper feed device and said upper draw-out device;
- a rotation amount controlling means for changing amount of rotation of said motor for a unit line spacing amount in response to the type of paper fed, such that fed amount of paper in either case wherein the perforated paper is fed by said perforated paper feed device and said paper draw-out device and wherein a cut shet paper is fed by said paper draw-out device alone may be made equal;
- and
- a pressure controlling means for changing contact pressure of said pressure roller to said drive roller to a weaker level, while paper feeding by said perforated paper feed device is conducted, than that in otherwise operation.
4 more elements
A printing paper feeding mechanism for a printer comprising:
- a perforated paper feed device provided with a pin tractor, for feeding a web with holes perforated at periodic locations along both edges toward a printing position, fittable into said perforations;
- a paper draw-out device comprising a rotatable drive roller and a pressure roller, abuttable thereto for being able to rotate associated therewith, for drawing out a paper printed at the printing position therefrom while holding said paper under pressure between both rollers;
- a transmitting device for connecting said perforated paper feeding device and said paper draw-out device to impart larger amount paper drawing out action to said paper draw-out device than paper feeding amount by said perforated paper feed device;
- a motor for driving said perforated paper feed device and said paper draw-out device;
- and
- a rotation amount controlling means for changing the amount of rotation of said motor for a unit line spacing amount in response to the type of paper fed, such that fed amount of paper in either case wherein the perforated paper is fed by said perforated paper feed device and said paper draw-out device and wherein a cut sheet paper is fed by said paper draw-out device alone may be made equal.
3 more elements
A printing paper feeding mechanism for a printer comprising:
- a paper feed device, disposed above a printing position, comprising a rotatable drive roller and a pressure roller abuttable to said drive roller and rotatable in association therewith for feeding a cut sheet paper while holding said paper between the both rollers under pressure;
- an operable member which is operated for separating said pressure roller from said drive roller to load said paper from above said printing position passing through between the both rollers;
- a positioning member, normally located at an original position so as not to obstruct the paper feeding operation, and shiftable to an operative position beneath the printing position for being abutted by, and for supporting, the lower end of said paper when it is loaded;
- linkage means for linking said positioning member and said operable member to move said positioning member to said operative position prior to the separating operation of said pressure roller owing to operation of said operable member and to return said positioning member from said operative position to said original position after said pressure roller has been abutted onto said drive roller;
- and
- an initial drive means for rotating said drive roller for the purpose of transporting said paper loaded by the operation of said operable member to a print starting position.
3 more elements
A printing paper feeding mechanism for a printer comprising:
- a first paper feed device provided with a pin tractor, for feeding a web with holes perforated at periodic locations along both edges toward a printing position, engageable with said perforations;
- a second paper feed device, disposed above the printing position, comprising a rotatable drive roller and a pressure roller abuttable to said drive roller and rotatable in association therewith for drawing out the web fed by said first paper feed device and for feeding a cut sheet paper while holding them between the both rollers under pressure;
- a bidirectionally rotatable motor for driving said first paper feed device and said second paper feed device;
- an operable member which is operated for separating said pressure roller from said drive roller to load the cut sheet paper from above said printing position passing through between the both rollers;
- a positioning member, normally located at an original position so as not to obstruct the paper feeding operation, and shiftable to an operative position beneath the printing position for being abutted by, and for supporting, the lower end of the cut sheet paper when it is loaded;
- linkage means for linking said positioning member and said operable member to move said positioning member to said operative position prior to the separating operation of said pressure roller owing to operation of said operable member and to return said positioning member, from said operative position to said original position after said pressure roller has been abutted onto said drive roller;
- a backward drive means for backwardly rotating said motor to actuate said drive roller for the purpose of transporting the cut sheet paper loaded to a print starting position;
- a transmitting device for connecting said first paper feed device and said second paper feed device to impart larger amount paper drawing out action to said second paper feed device than paper feeding amount by said first paper feed device;
- and
- a rotation amount controlling means for changing the amount of forward rotation of said motor for a unit line spacing amount in response to the type of paper fed, such that fed amount of paper in either case wherein the web is fed by said first paper feed device and said second paper feed device and wherein the cut sheet paper is fed by said second paper feed device alone may be made equal.
7 more elements
Dependencies are inferred from the claim text.