EP0027546A2 - Vorrichtung zum Zuführen von Einzelbelegen - Google Patents

Vorrichtung zum Zuführen von Einzelbelegen Download PDF

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Publication number
EP0027546A2
EP0027546A2 EP80105499A EP80105499A EP0027546A2 EP 0027546 A2 EP0027546 A2 EP 0027546A2 EP 80105499 A EP80105499 A EP 80105499A EP 80105499 A EP80105499 A EP 80105499A EP 0027546 A2 EP0027546 A2 EP 0027546A2
Authority
EP
European Patent Office
Prior art keywords
sheet
plate
stack
paper
tray
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.)
Granted
Application number
EP80105499A
Other languages
English (en)
French (fr)
Other versions
EP0027546A3 (en
EP0027546B1 (de
Inventor
Paul Aloysius Quinn Jr.
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of EP0027546A2 publication Critical patent/EP0027546A2/de
Publication of EP0027546A3 publication Critical patent/EP0027546A3/fr
Application granted granted Critical
Publication of EP0027546B1 publication Critical patent/EP0027546B1/de
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
    • B41J13/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets
    • B41J13/10—Sheet holders, retainers, movable guides, or stationary guides
    • B41J13/103—Sheet holders, retainers, movable guides, or stationary guides for the sheet feeding section

Definitions

  • the present invention relates to a device for feeding sheets of paper for a typewriter, and, more particularly, such a device which comprises means making it possible to remove the bottom sheet of paper from a stack and bring it to the plate. of the typewriter.
  • the device for feeding sheets of paper can separate the different sheets and feed one sheet at a time onto the stage of the typewriter, without this separation requiring the use of drive rollers or additional power, which would make the device more complicated. Furthermore, it is also desirable that, as soon as a sheet of paper is positioned on the platen for the printing operation, there are means enabling automatic interruption matically the sheet shifting operation until, having completed the printing operation, it is necessary to bring another sheet onto the platen.
  • the main object of the present invention is therefore to provide a device for feeding sheets of paper which can be easily mounted on a typewriter and makes it possible to feed one sheet at a time onto the plate of the machine from a pile of leaves.
  • Another object of the present invention is to provide such a device for feeding sheets of paper which is inexpensive and easily achievable, but which can operate reliably and requires only a minimum of intervention on the part of the operator.
  • Another object of the present invention is to provide a device for feeding sheets of paper for a typewriter which can also receive the sheet which has just been printed.
  • FIG. 1 shows a typewriter 10 to which is connected a device for feeding sheets of paper according to the present invention.
  • the typewriter 10 comprises a keyboard or other similar element 11, a plate 12 and a printing element 13 which moves along the plate 12 by means of a carriage (not shown) so as to print, via , for example, a ribbon, characters or symbols on a sheet of paper which conventionally surrounds the plate 12.
  • the typewriter 10 comprises a stepping motor or the like. 14 which is coupled to the plate 12 so as to advance the latter (and therefore one or more sheets of paper) step by step, either when the operator presses a key such as the key 15, or automatically by to a pre-programming, or again via the return key of the carriage which is on the machine.
  • the feed device 20 receives a stack of sheets of paper, makes it possible to remove the lower sheet from the latter and bring it to the stage. 12, and can optionally receive, from the plate, the sheet which has just been printed.
  • This is achieved by first spreading the different sheets of paper making up the stack so that the bottom sheet is first drawn in a first direction away from the platen of the typewriter and then driven in the opposite direction, as a result of a reversal of the direction of rotation of the wheel that the sheet shifting device comprises, so that said sheet reaches the nipping zone of the drive rollers, which can be coupled to platinum.
  • the sheet of paper is then brought onto the platen and, when the latter rotates, is extracted from the feed device. To this end, and as shown in FIGS.
  • the supply device comprises a rectangular-shaped tray 21 provided with walls 22 and 23 which are perpendicular to the surface of the tray and are located, one with respect to the other, at a sufficient distance so that a stack of sheets of paper 30 can be arranged between them on which characters and other symbols can be printed using the typewriter 10.
  • the surface of the tray, on which is arranged and held by gravity the stack of sheets of paper, comprises two support elements, 24 and 25, which are separated from each other, so that there is between them an opening 28 capable of receiving at least one leaf shifting wheel 29 which projects vertically in the opening 28 above the plane of the elements 24 and 25, the latter being located closest to the plate, so that a stack 30 of sheets of paper placed on elements 24 and 25 rests , in the central part of the plate, on the wheel 29 and therefore has a slightly arched shape (see Figure 4).
  • the wheel 29 therefore comes into contact with the lower sheet 30a of the stack 30.
  • the element 24, which is the furthest from the plate 12, has a flange or a projection, while the element 25 preferably has two fingers 26, 27, projecting and separated from each other, on which rests the front edge of the sheet bottom of the stack.
  • the rotation of the wheel 29 is ensured by drive means 31 constituted, for example, by a motor operating in direct current coupled via a belt 32 to a pulley 33 mounted on a shaft 34 on which the wheel 29 is itself mounted.
  • drive means 31 constituted, for example, by a motor operating in direct current coupled via a belt 32 to a pulley 33 mounted on a shaft 34 on which the wheel 29 is itself mounted.
  • the motor 31 drives the wheel 29 so that the bottom sheet 30a of the stack 30 is driven in a first direction, which has the effect of moving it away from the plate 12 of the typewriter.
  • the sheet shifting operation continues until the front edge 30b (FIG. 5B) of this sheet 30a leaves its support formed by the fingers 26 and 27 (FIG. 3).
  • This position of the sheet is detected by an upper detector 35, which causes a reversal of the direction of rotation of the motor 31 and, consequently, a reversal of the direction of rotation of the wheel 29.
  • the sheet 30a After detection by the detector 35 of the lower sheet 30a and reversing the direction of rotation of the motor 31 and of the wheel 29, the sheet 30a is introduced between a driven roller 40 and an idler roller 40a which is mounted below each of the fingers 26 and 27.
  • the element 25 comprises, below each of the fingers 26 and 27, a tongue 25a which is inclined downwards and acts as a guide surface, the idler roller 40a being mounted on this surface 25a ( Figure 4), which aims to facilitate the separation and guiding of the sheets.
  • a second detector, or lower detector 36 (see FIG. 4), is used to deactivate the motor 31.
  • this roller 40 In order to drive the roller 40 so that the sheet of paper 30a is brought onto the plate 12 of the typewriter via an opening 50 in the form of a slot, in the preferred embodiment, this roller 40, which is below the two fingers 26 and 27, is connected to a shaft 41 which is arranged perpendicular to the axis of the plate 21 and ends with a pinion 42 (FIG. 2) which is coupled via a driven pinion 43 to a second driven pinion 44, the object of which will be described later.
  • a belt 43a to connect the driven pinion 43 to the plate of the typewriter, or any other drive means allowing either to turn the plate manually to remove the sheet of paper therefrom, or using a motor such as the motor 14 associated with the typewriter to ensure the rotation of the platen and to send the sheet to a position for printing start.
  • any means may be used to rotate the roller 40 by coupling it to the plate 12 or to any other drive means, it being understood that it is only necessary that the lower sheet of paper 30a be brought to the plate passing through the slot 50.
  • the second driven pinion 44 is coupled, by means, for example, of a shaft 45a (see FIG. 2) which is also arranged perpendicular to the axis of the plate 21 and which is connected to a pair of driven rollers 46 arranged at a certain distance from one another and which make it possible to apply the sheet of paper which has just been printed against the idle rollers 47 to remove it from the plate and place it on top of the stack 30.
  • the operation of the feed device can be controlled using simple timing devices making it possible to move the bottom sheet of paper away from the stack, due to the action of the wheel 29, then reverse the direction of rotation of the motor so that this sheet can pass under the fingers 26 and 27.
  • a simple electromechanical detector can be used such as a microswitch and a locking circuit for control the direction of rotation of the drive motor and the time intervals during which it is on and off.
  • the arrangement with two detectors which is described below in more detail is preferable since it is inexpensive and can be easily carried out.
  • the motor control circuit 31 which drives the wheel 29 is shown in Figure 6.
  • this circuit has a conventional configuration in H 60 and includes a pair of PNP transistors 61 and 62 connected to a voltage source V1 via resistors R1 and R2.
  • the lower half of this H is formed by two NPN transistors 63 and 64 whose emitters are grounded at 65 and whose collectors are connected to the collectors of the PNP transistors 61 and 62.
  • the motor 31 is mounted, as shown in the figure 6, between the conductors 66a and 66b which connect the various collectors and respectively connect the transistor 61 to the transistor 63 and the transistor 62 to the transistor 64.
  • the inputs of the transistors 61 and 64 are marked “high” and those of transistors 62 and 63, the mention “low”, these terms referring to the direction of rotation of the motor which causes the displacement of the bottom sheet 30a of the battery 30 towards the "top”, that is to say towards the detector 35, or towards the "bottom", that is to say towards the plate.
  • the base of the transistors 61 and 62 receives an input via the bias resistors R3 and R5 and the resistors R4 and R6 respectively connected to the output of the inverters 67 and 68.
  • the base of the transistor 63 receives a input via inverters 69 and 70, and the base of transistor 64, via inverters 71 and 72.
  • the polarization resistors R7, R8, R9 and R10 play their normal role. If it is assumed, for example, that a "high" signal (indicating with respect to FIG. 9 the fact that the lower sheet of paper 30a is driven towards the top of the feed device by the wheel 29 , which amounts to saying, relative to FIG. 4, that the wheel 29 rotates counterclockwise) is a signal having a positive transition, the inverter 67 reverses this signal and turns the transistor 61 on, so that 'a current flows in this transistor from source VI. On the other hand, this "high” signal is also applied to the transistor 64 via the inverters 71 and 72, the transistor 64 being turned on.
  • the current reaches transistor 64, then to ground 65, after having passed through transistor 61 and motor 31.
  • the signal applied to transistor 62 and 63 is at low level, these transistors are blocked and are not crossed by any current.
  • the DC motor 31 rotates the wheel 29 which drives the bottom sheet of paper 30a upward until it has been detected by the detector 35, after which an inversion of the direction of rotation of the motor, and consequently of the wheel 29, occurs.
  • a positive signal is applied to the "low” inputs of transistors 62 and 63, and the "high” signal ceases to be applied to transistors 61 and 64.
  • the high level signal applied to the input of the inverter 68 which is associated with the PNP transistor 62 turns the latter on, so that the current flows through the latter as well as the motor 31 and the transistor 63, which is turned on because the positive signal applied to the inverters 69 and 70 causes an increase in the voltage applied to the base of the NPN transistor 63, the current then being able to reach ground 65 by following this path and, consequently, passing through the motor 31, the direction of rotation of which is then reversed.
  • the upper detector 35 which is schematically represented in FIG. 7 comprises a standard voltage source V2 from which the voltage is applied via resistors R11 and R12 to a light-emitting diode D1 and to a phototransistor 75.
  • the latter is arranged on the same side of the sheet of paper 30a as the diode D1 and therefore operates in the so-called reflection mode.
  • the output of the phototransistor 75 is applied to an NPN amplification transistor 76, which is turned on, a pulse is then applied to two Schmitt flip-flops with inverted outputs 77 and 78, so that an output pulse referenced "detector 35 "and whose shape is analogous to that shown in FIG. 7 is obtained at the output of the flip-flop 78.
  • the phototransistor 75 When the phototransistor 75 detects the presence of a sheet of paper such as the bottom sheet 30a, it provides an output analogous to that shown in FIG. 7, which is applied to the flip-flop 80 and causes it to change state, thus making the transistors 61 and 64 pass by and putting the motor 31 out of function.
  • the output of detector 35 is applied to a second flip-flop 81, the output of which then passes to the high level, the shape of this output being practically similar to that shown in FIG. 9.
  • This output has the effect of making the transistors 62 and 63 passable in the manner previously described and to reverse the direction of rotation of the motor 31.
  • the capacitor C2 has the effect of slightly delaying the change of state of the flip-flop 81, so that one can be certain that the transistors 61 and 64 will be blocked before the transistors 62 and 63 are turned on to cause an inversion of the direction of rotation of the motor.
  • the lower detector 36 is identical to the upper detector 35 and includes resistors R13 and R14 connected to a voltage source V2, a light-emitting diode D2 and a phototransistor 83 which operates in the reflection mode, so that the transistor NPN amplification 84 is turned on when the presence of a sheet of paper is detected by the phototransistor.
  • the output of transistor 84 is applied to two Schmitt flip-flops with inverted outputs 85 and 86, and the signal then obtained, referenced "detector 36" and having a shape similar to that shown in FIG. 8 , is applied to the other device of the flip-flop 81 (FIG. 9), passing the latter to the low level and blocking the transistors 62 and-63.
  • Transistors 61 to 64 Darlington pairs
  • a temporary element 90 comprising in the region of the fingers 26 and 27 of the recesses 91 and 92 and which can be connected by means of a hinge with the vertical walls 22 and 23 of the tray so as to support the lower edge of the stack when it is initially placed in the tray on the element 24.
  • the element 90 requires the use of a cover 95 which must be lifted by the user by pivoting it around the pivot 96 when it deposits the stack of sheets in the tray on elements 24 and 90.
  • the link 97 coupled to the latter rotates clockwise (relative to FIG. 2) a pair of cams 98 and 99 which bear against the lower surface of the element 90, rotating it up above the fingers 26 and 27.
  • the cover is first lifted, thus causing an upward rotation of the element 90 which makes it possible to deposit the sheets of paper thereon without any of the sheets being able to separate from the stack and fall below the fingers 26 and 27.
  • the cover 95 also makes it possible to separate the blank sheets from the sheets already printed so that the user can easily grasp them, and, because of its weight, increases the pressure exerted by the stack of sheets of paper on the wheel 29 of the shift device , and on the support elements 24, 25, 26 and 27.
  • the detector 35 In order to be able to use sheets of paper of different lengths, it is preferable for the detector 35, as shown in FIG. 1, to be mounted on a slide 100 that the element 24 of the tray has, this slide being able to slide in a groove 101 comprising various stop positions such as positions 102 and 103 in order to allow the user to choose the position of the upper detector 35 as a function of the length of the sheets of paper used. It would obviously be possible to make appropriate modifications to the tray so that it can, if necessary, move laterally so as to allow the use of sheets of paper of variable widths.
  • the feed device is preferably arranged so as to make an angle with the base of the typewriter 10 so that the sheets of paper can more easily be brought to the plate 12.
  • the slot 50 must therefore be arranged so as to make a given angle in the case of the use of a given typewriter and can be easily connected to the rear part of the frame of the machine using, for example, the support 104 so conventional, for example by means of self-tapping screws, wing nuts, bolts, etc., or may optionally be integral with the typewriter.
  • a metal grid 110 having a convex shape and comprising an opening 28a intended to allow the passage of the wheel 29.
  • This grid is preferably rence supported in the tray so as to cause a curvature of the stack of sheets 30 in the desired direction, and allows, when connected to ground, the flow of electrostatic charges existing on the bottom sheet 30a of the stack 30 .
  • the feeding device of the present invention is both simple and inexpensive and can easily be used with an automatic typewriter.

Landscapes

  • Sheets, Magazines, And Separation Thereof (AREA)
  • Handling Of Cut Paper (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Conveyance By Endless Belt Conveyors (AREA)
EP19800105499 1979-10-17 1980-09-15 Vorrichtung zum Zuführen von Einzelbelegen Expired EP0027546B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US8582679A 1979-10-17 1979-10-17
US85826 1979-10-17

Publications (3)

Publication Number Publication Date
EP0027546A2 true EP0027546A2 (de) 1981-04-29
EP0027546A3 EP0027546A3 (en) 1982-09-29
EP0027546B1 EP0027546B1 (de) 1985-02-06

Family

ID=22194197

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800105499 Expired EP0027546B1 (de) 1979-10-17 1980-09-15 Vorrichtung zum Zuführen von Einzelbelegen

Country Status (4)

Country Link
EP (1) EP0027546B1 (de)
JP (1) JPS601252B2 (de)
CA (1) CA1149313A (de)
DE (1) DE3070115D1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0036072B1 (de) * 1980-03-18 1984-05-16 International Business Machines Corporation Papiervorschubeinrichtung
EP0320048A3 (en) * 1987-12-05 1990-01-17 Philips Patentverwaltung Gmbh Office machine with a paper cartridge

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57210877A (en) * 1981-06-20 1982-12-24 Usac Electronics Ind Co Ltd Paper feeder in printer

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2237874A (en) * 1939-10-24 1941-04-08 Remington Rand Inc Paper feeding device
US3350089A (en) * 1965-06-15 1967-10-31 Frederick Post Co Sheet-feeding method and apparatus
DE2054935A1 (de) * 1970-11-07 1972-05-10 Anker Werke Ag Belegzuführungs- und Vereinzelungseinrichtung an Buchungsmaschinen oder dergl
US4165870A (en) * 1978-03-20 1979-08-28 International Business Machines Corporation Wave generator to shingle sheets

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0036072B1 (de) * 1980-03-18 1984-05-16 International Business Machines Corporation Papiervorschubeinrichtung
EP0320048A3 (en) * 1987-12-05 1990-01-17 Philips Patentverwaltung Gmbh Office machine with a paper cartridge

Also Published As

Publication number Publication date
CA1149313A (en) 1983-07-05
EP0027546A3 (en) 1982-09-29
JPS5661249A (en) 1981-05-26
EP0027546B1 (de) 1985-02-06
DE3070115D1 (en) 1985-03-21
JPS601252B2 (ja) 1985-01-12

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