EP0056955B1 - Paper feeding method in a printer - Google Patents

Paper feeding method in a printer Download PDF

Info

Publication number
EP0056955B1
EP0056955B1 EP82100237A EP82100237A EP0056955B1 EP 0056955 B1 EP0056955 B1 EP 0056955B1 EP 82100237 A EP82100237 A EP 82100237A EP 82100237 A EP82100237 A EP 82100237A EP 0056955 B1 EP0056955 B1 EP 0056955B1
Authority
EP
European Patent Office
Prior art keywords
feeding
pins
elements
bar
friction means
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP82100237A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0056955A3 (en
EP0056955A2 (en
Inventor
Cosimo Cassiano
Paolo Urso
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bull HN Information Systems Italia SpA
Original Assignee
Honeywell Bull Italia SpA
Honeywell Information Systems Italia SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Honeywell Bull Italia SpA, Honeywell Information Systems Italia SpA filed Critical Honeywell Bull Italia SpA
Publication of EP0056955A2 publication Critical patent/EP0056955A2/en
Publication of EP0056955A3 publication Critical patent/EP0056955A3/en
Application granted granted Critical
Publication of EP0056955B1 publication Critical patent/EP0056955B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/26—Pin feeds
    • B41J11/32—Adjustment of pin wheels or traction elements, e.g. laterally

Definitions

  • the present invention relates to a paper feeding method in printers such as those used in data processing systems where a printing form with perforations on the sides or a printing support without side perforations can be used as a printing support. It is known that most users of printers for data processing system require that such printers be able to operate both with perforated printing supports and with continuous printing forms without lateral perforations.
  • the described example of paper feeding mechanism can operate with non perforated printing forms having different width (the maximum width is however determined by the distance between the pin wheels) but it has the disadvantage of beingunable to handle side perforated printing forms having different sizes, as the distance between the pin wheels cannot be changed.
  • a first mechanism is supplied to assure the friction feeding of non perforated continuous printing forms (which may have different width). It consists in a feeding roll fixed to a first tractor bar and cooperating with pressure rollers.
  • a second mechanism assures the feeding of the continuous side perforated printing form. It consists in two pin wheels cooperating with pads and mounted on a second tractor bar. The pin wheels may be axially moved along the second bar and locked in a determined position, thus allowing to operate with printing forms having different width.
  • the tractor bars are actuated by the same motor by means of a belt pulley or gear transmission system.
  • the embodiment involving the use of two separate feeding mechanisms solves the problem to operate with several sizes both of the side perforated printing form both of the unperforated printing form but makes the printer structure complicated, expensive as well as cumbersome.
  • the present invention overcomes such disadvantages and provides a method which allows to operate with different sizes of both side perforated printing forms and unperforated printing forms by means of a simple and inexpensive paper feeding mechanism.
  • a paper feeding mechanism may comprise a pair of feeding wheels each one provided with circumferential sprocket pins engageable in perforations along the edges of multilayered paper strips for advancing same and with a frictional tire element immediately adjacent to the sprocket pins, for slightly increasing the diameter of the wheel and functioning to frictionally engage and overdrive the last copy of the multilayered strips at the same rate of speed as the first copy and thereby prevent shingling of the paper layers of the strips.
  • such paper feeding mechanism may be used to feed both non perforated printing forms as well as side perforated printing forms, provided the feeding wheels may be axially moved along a tractor bar and locked in any desired position: thus it is possible to operate with printing forms of different width, up to a maximum width imposed by the printer structure.
  • the frame is formed, for instance, by two side plates 1, 2 and a base 3.
  • the printing mechanism may be formed, for instance, by two guiding rods mounted between the sides, on which a printing carriage slideably moves.
  • a printing head for instance of the needle type, is mounted on the printing carriage and allows to obtain the printing of several types by a dot composition, obtained through the energization of several needles and the combined transversal movement of the head and carriage.
  • the printing is performed against a platen 4 on which the printing support moves.
  • Each of such feeding elements is a cylinder, preferably in plastic material, which is. provided along a first circumference with pins 8A and along a second circumference with a groove 8B where one or more rubber rings (preferably 2 rings) are housed.
  • Circumferential portions of the feeding elements which are provided with rings are located internally relative to the circumferential portions provided with pins and considering as reference the direction of bar 13.
  • Fig. 2 shows in detail the exploded perspective view of a positioning and guiding arm 10 and its relation with feeding element 8 and the corresponding pad 12.
  • the guiding arm is substantially constituted by a body shaped in form of connecting rod and provided with an arm 10A, a small end 10B, a big end 10C.
  • the circular opening in the big end receives a hub 50 integral and coaxial to the cylindrical feeding element 8.
  • Hub 50 as well as the cylindrical feeding element, has a prismatic axial opening 51 where guiding bar 13 is inserted.
  • Hub 50 is further provided with a cylindrical groove 52, intended to house an elastic retaining ring 53 (Benzing (RTM), Seeger (RTM) ring or alike).
  • RTM Benzing
  • RTM Seeger
  • feeding element 8 and guiding arm 10 are mutually pivoted so that the relative rotation of the two element according to the rotation axis of the tractor bar is permitted, but any relative axial movement is prevented.
  • the small end 10B of the guiding arm is engaged with guiding rod 14 and is free to axially move along this one.
  • Pad 12 is provided with a pair of drilled tabs 12A, 12B hinged to a corresponding tag 31 of end 10C by means of a pin 30.
  • Pad 12 is firmly kept in a working position or in an opened position by a return spring 32, suitably fixed to an eye or pin of the pad, on one side, and to an eye or pin of end 10C, on the other one.
  • pad 12 lies on a peripheral portion of feeding element 8.
  • An elongated opening 33 or a groove is provided in the pad zone which, when pad is in working position, gets in contact with the toothed zone of the feeding element, thus avoiding any interference between the pad and the pins.
  • the pressure rollers 34, 35 are hinged, by means of two pins 136, 37, on the pad side opposite to the side hinged to end 10C.
  • rollers are housed in suitable pad seats and, when the pad is in working position, they lie on the rubber rings 36, housed in the groove of feeding element 8.
  • Their rotation axis is substantially parallel to the rotation axis of the guiding rod.
  • the rotation of the feeding elements thus causes the movement of the form.
  • the set of feeding element 8, pad 12 and positioning and guiding arm 10, forms a traction group.
  • the traction group formed by feeding element 7, pad 11 and positioning and guiding arm 9 is mirror like identical to the first one.
  • the two traction groups may be assembled from identical elements.
  • the guiding pads prevent disengagement of the side perforations from the feeding pins.
  • the feeding action exerted by the pins is further aided by the feeding action exerted on the form side portions by the rubber rings and due to the pressure exerted by the pressure rollers.
  • the method of the invention may be carried out with feeding mechanisms where toothed belts are provided instead of pin wheels.

Landscapes

  • Handling Of Sheets (AREA)
EP82100237A 1981-01-22 1982-01-14 Paper feeding method in a printer Expired EP0056955B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1926181 1981-01-22
IT19261/81A IT1135127B (it) 1981-01-22 1981-01-22 Meccanismo di trasporto carta per stampante

Publications (3)

Publication Number Publication Date
EP0056955A2 EP0056955A2 (en) 1982-08-04
EP0056955A3 EP0056955A3 (en) 1983-09-07
EP0056955B1 true EP0056955B1 (en) 1985-05-29

Family

ID=11156201

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82100237A Expired EP0056955B1 (en) 1981-01-22 1982-01-14 Paper feeding method in a printer

Country Status (3)

Country Link
EP (1) EP0056955B1 (it)
DE (1) DE3263801D1 (it)
IT (1) IT1135127B (it)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE440766B (sv) * 1981-10-09 1985-08-19 Facit Ab Pappersmatningsanordning
JPS6065631U (ja) * 1983-10-14 1985-05-09 アルプス電気株式会社 記録装置の紙送り機構
DE3412852C2 (de) * 1984-04-03 1986-07-17 Mannesmann AG, 4000 Düsseldorf Transportvorrichtung für Drucker, insbesondere für Matrixdrucker
JPS6147651U (ja) * 1984-08-31 1986-03-31 アルプス電気株式会社 プリンタの紙送り装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3438560A (en) * 1967-07-12 1969-04-15 Burroughs Corp Snap-on web supporting member for web feed mechanism
US3838804A (en) * 1973-05-10 1974-10-01 Ibm Non-shingling forms feed tractor

Also Published As

Publication number Publication date
EP0056955A3 (en) 1983-09-07
EP0056955A2 (en) 1982-08-04
DE3263801D1 (en) 1985-07-04
IT1135127B (it) 1986-08-20
IT8119261A0 (it) 1981-01-22

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