EP0344698A2 - Vorrichtung und Arbeitsweise zur Bildung einer Ausgleichsschleife in einem Band - Google Patents

Vorrichtung und Arbeitsweise zur Bildung einer Ausgleichsschleife in einem Band Download PDF

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Publication number
EP0344698A2
EP0344698A2 EP89109693A EP89109693A EP0344698A2 EP 0344698 A2 EP0344698 A2 EP 0344698A2 EP 89109693 A EP89109693 A EP 89109693A EP 89109693 A EP89109693 A EP 89109693A EP 0344698 A2 EP0344698 A2 EP 0344698A2
Authority
EP
European Patent Office
Prior art keywords
web
loop
motor
roller
compensation
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
EP89109693A
Other languages
English (en)
French (fr)
Other versions
EP0344698A3 (en
EP0344698B1 (de
Inventor
Luciano Meschi
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.)
Industria Grafica Meschi SRL
Original Assignee
Industria Grafica Meschi SRL
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 Industria Grafica Meschi SRL filed Critical Industria Grafica Meschi SRL
Publication of EP0344698A2 publication Critical patent/EP0344698A2/de
Publication of EP0344698A3 publication Critical patent/EP0344698A3/en
Application granted granted Critical
Publication of EP0344698B1 publication Critical patent/EP0344698B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/042—Sensing the length of a web loop
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H20/00—Advancing webs
    • B65H20/24—Advancing webs by looping or like devices

Definitions

  • the present invention is referred to a device generating a compensation loop on a web that is sent to graphic machines, such as printers.
  • an object of the present invention is that of providing a device generating a loop in a web feeding a graphic machine, for compensating the intermittent operating of said graphic machine, meaning that sometimes said web is not required and sometimes there is a strong necessity thereof.
  • Another object is that of providing signal means capable of detecting the formation of a loop in a web at the input of said graphic machine.
  • Another object is to stop the web letting in to said graphic machine when a loop formed in said device exceeds a first prefixed length and to start it again when said loop is shorter than a second prefixed length (that is its length is too short).
  • a further object is to cause said stopping or said starting of the move­ment of said web to take place in a gradual way to prevent the paper from being spoiled.
  • a known method to signal an excessive shortening or lengthening of said loop is to employ very sensible microswitches respectively connected both to a tray whereon the loop bottom can lay and to a short rod that can be lifted from the loop when the loop is shortening too much, said micro­switches operating a motor controlling the entrance of the web to said graphic machine.
  • Another method uses proximity detectors such as capacity detectors by which the capacity variation of an electrode as caused by the presence of an insulating material such as a web is sensed.
  • proximity detectors such as capacity detectors by which the capacity variation of an electrode as caused by the presence of an insulating material such as a web is sensed.
  • the device of the present invention consists of a frame (12) put between a storage or supply for paper to be printed and a graphic machine, such as a printer, said frame being provided with at least one roller (30) driving a web (38) that comes into the graphic machine after having formed a compensation loop (40), said roller (30) being driven by motor means (32) the turning on of which depends on the detection of a prefixed length of said loop (40) by a web presence detector.
  • said frame (12) includes two rollers, one (28) of which is idle and is used to take said web (38) around another driving roller (30) in turn driven by said motor (32) and helped in driving said web by counter-rollers (36a-36c) which press said web against said roller.
  • the loop (40) of the web (38) is supported upstream by said driving roller (30) and downstream by another driving roller (42) that is part of the graphic machine receiving the web (38).
  • said web presence detector is composed by a lamp (50) and photedector (52) assembly by which the presnece of the loop (40) of the web (38) in its proximity through the light reflected by said web (38).
  • the photedector (52) which detects the presence of the loop (40) of the web (38), has a digital output, indicating the absence or the presence of said loop (40) without considering the small variations of said reflected light.
  • said photodector (52) is equipped with an electronic circuit (60) having a narrow hysteresis loop the output of which changes in the as much as possible clear cut way and without uncertainty from a high state to a low state respectively corresponding to the absence or presence of said web (40).
  • said electronic circuit (60) includes a voltage comparator (68) comparing the output of said photodetector (52) with a voltage prefixed by voltage regulator means (74) setting said electronic circuit (60) to change its state at a prefixed distance between the photedetector (52) and the loop (40) of said web giving place to a predetermined reflected light intensity.
  • said voltage comparator (68) is followed by a ramp generator circuit (76) by which the speed of said motor is adjusted varying it from a zero to a maximum value and back from the maximum value to zero in prefixed times permitting accelerations and decelerations of the motor (32) such as not to spoil said web (38).
  • a compensation loop device 10 as including a frame 12 formed by two first vertical struts 14 and 16, two longitudainl members 18 and 20 attached to the base of said struts 14 and 16, two shorter vertical struts 22 and 24 and a cross member 26 connect­ing said struts at their top.
  • the two first vertical struts 14 and 16 support, in the lower part, a first idle roller 28 and in the upper part, a second roller 30 driven by an electric motor 32 by suitable means such as a belt 34.
  • Supporting counter-rollers 36a, 36b, 36c keep pressed, by means of a device 37, a web 38 against a second roller 30 after it has passed around the idle roller 28, said web 28 coming from a paper storage, such a a reel or a box (not shown).
  • the web 38 after coming down from the roller 30 forms a loop 40 which during the operation can take positions 40a and 40b and then comes up to another roller 42 fixed by brackets, such as a bracket 44 to the body (48) of a graphic machine.
  • the right shape of the loop 40 is detected by a proximity detector con­sisting of a lamp or light emetting means 50 and of a photodector 52, sensing a light ray emitted by the lamp 50 and reflected or diffused by the loop 40 of the web 38 that is running in the direction of the arrows 54 and 56.
  • the upper ends of the struts 14 and 16 are joined by a bridge 57, sup­porting the motor 38 and the device 37 by which the counterrollers 36a, 36b, 36c are placed against the roller 30 and one of the struts has a housing 58 for controlling circuits for the web 38 provided with knobs and displays 59a, 59b and 59c.
  • An electronic circuit for detecting the loop 40 includes a phototransistor 62 connected by a load resistor 64 to a con­tinuous input voltage +V R and by a coupling resistor 66 to a not invert­ing input of a voltage comparator circuit 68 that throguh a feedback resistor 70, whose value can be determined by a person skilled in the art, has a narrow histeresis loop to promote a clear cut and definite change of its input state.
  • the inverting input of the voltage comparator 68 is connected through a coupling resistor 72 to a potentiometer 74 whose adjustment influences the sensibility of the circuit 60 and therefore the distance between the loop and the proximity detector 48 causing the state change at the output of the comparator 68.
  • the output of the comparator 68 is connected to an input of a ramp generator 76 that upon receiving at said input a stepped signal both up­wardly and downwarndly transforms the said signal at the output in a ramp signal extending the duration of said variation.
  • the ramp signal is taken to a second input by a feedback connection 78 to give linearity thereto and it is applied to an input of a driving amplifier 80 the purpose of which is to supply to an electric motor, such as the motor 32, having a speed proportional to an applied voltage.
  • the operation of the present invention is as follows: a web 38 to be printed, drawn from a supply is passed around the rollers 28 and 30 of the frame 12 and then, after having formed a loop 40, comes to a roller 42 of the graphic machine.
  • the motor 32 rotates at its maximum speed driving the roller 30 and thus the web 38, the loop of which takes the positions 40, 40a, 40b. While the loop goes from the position 40 to the position 40b, the light reflected from the emitter 50 to the photodetector 52 changes from an intensity almost zero to an increasing intensity, making the phototransistor of figure 3 more and more conductive until its collector voltage gets down to a value at which it commutates the output of the voltage comparator 68 from its high value to the low one. At that point the ramp detector 76 initiaties a descending ramp at its output causing the motor 32 to gradually decelerate until it stops.
  • the roller 42 keep on drawing the web 48 in such a way that its loop goes from the position 40b to the position 40 where the lacking of light impinging onto the photodetector 52 restores a high voltage at the output of the voltage generator 68 and a gradual return of high voltage accord­ing to a rising ramp at the output of the ramp generator 76.
  • This causes the motor to gradually accelerate again which in turn causes the web 38 to form again the loop passing from the position 40 to the posi­tion 40b and the operating cycle of the motor 32 is repeated.
  • the ramp circuit 36 could be substituted for by stepping function generator or by a microprocessor providing a series of numerical data that is able to provide gradual acceleration and deceleration controls for the motor 32.
EP89109693A 1988-06-02 1989-05-30 Vorrichtung und Arbeitsweise zur Bildung einer Ausgleichsschleife in einem Band Expired - Lifetime EP0344698B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8820835A IT1234195B (it) 1988-06-02 1988-06-02 Dispositivo per ansa di compensazione di nastro di carta di una stampante ad alta velocita'
IT2083588 1988-06-02

Publications (3)

Publication Number Publication Date
EP0344698A2 true EP0344698A2 (de) 1989-12-06
EP0344698A3 EP0344698A3 (en) 1990-07-04
EP0344698B1 EP0344698B1 (de) 1995-04-05

Family

ID=11172760

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89109693A Expired - Lifetime EP0344698B1 (de) 1988-06-02 1989-05-30 Vorrichtung und Arbeitsweise zur Bildung einer Ausgleichsschleife in einem Band

Country Status (5)

Country Link
EP (1) EP0344698B1 (de)
JP (1) JPH0233044A (de)
AT (1) ATE120694T1 (de)
DE (1) DE68922021T2 (de)
IT (1) IT1234195B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0500160A1 (de) * 1991-02-11 1992-08-26 Industria Grafica Meschi S.r.l. Vorrichtung zum Steuern einer Schleife für Papierbahnen
ES2062917A2 (es) * 1992-10-01 1994-12-16 Bayarri Carmen Vazquez Maquina para la produccion de rollos de cinta sin mandril, y rollo de cinta obtenido por dicha maquina.
EP0836887A1 (de) * 1996-10-15 1998-04-22 Adolf Illig Maschinenbau GmbH & Co Verfahren zum Steuern der Einzugwalzen einer Schneidmühle zum Zerkleinern des Restgitters einer vorgeschalteten Thermoformaschine und Schneidmühle zur Durchführung des Verfahrens
EP1302326A3 (de) * 2001-10-11 2003-12-17 Christian Dr. Bay Papiertransporteinrichtung zwischen einem Plotter und einem Falter

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100565178B1 (ko) * 1998-09-22 2006-06-21 엘지전자 주식회사 유에스비 카메라 생산라인에서 카메라의 파라미터값을 조정하는방법
DE10032675B4 (de) * 2000-07-05 2006-06-14 Aradex Ag Bahnverarbeitende Maschine
DE102008039550A1 (de) * 2008-08-25 2010-03-04 OCé PRINTING SYSTEMS GMBH Verfahren und System zum Erzeugen von Polsterelementen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2500396A1 (de) * 1975-01-07 1976-07-08 Philips Patentverwaltung Anordnung zur fuehrung und zum transport streifenfoermiger aufzeichnungstraeger
JPS5369722A (en) * 1976-11-30 1978-06-21 Nec Corp Device for folding a blank to be printed
DE2912656A1 (de) * 1979-03-30 1980-10-09 Olympia Werke Ag Vorrichtung zum wahlweisen zufuehren von endlospapier und einzelblaettern in schreibwerken
JPS618367A (ja) * 1984-06-22 1986-01-16 Fuji Photo Film Co Ltd サイドプリント装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5841736B2 (ja) * 1976-10-01 1983-09-14 積水化成品工業株式会社 発泡熱可塑性樹脂成形品の成形方法
JPS5969340A (ja) * 1982-10-08 1984-04-19 Taiyo Shokai:Kk 合成樹脂フイルム帯の移送制御方法及びその装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2500396A1 (de) * 1975-01-07 1976-07-08 Philips Patentverwaltung Anordnung zur fuehrung und zum transport streifenfoermiger aufzeichnungstraeger
JPS5369722A (en) * 1976-11-30 1978-06-21 Nec Corp Device for folding a blank to be printed
DE2912656A1 (de) * 1979-03-30 1980-10-09 Olympia Werke Ag Vorrichtung zum wahlweisen zufuehren von endlospapier und einzelblaettern in schreibwerken
JPS618367A (ja) * 1984-06-22 1986-01-16 Fuji Photo Film Co Ltd サイドプリント装置

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 10, no. 153, (M-484) 3 June 1986; & JP-A-61 008 367 (FUJI SHASHIN FILM K.K.) 16-01-1986 *
PATENT ABSTRACTS OF JAPAN, vol. 2, no. 103 (M-78) 24 August 1978; & JP-A-53 069 722 (NIPPON DENKI K.K.) 21-06-1978 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0500160A1 (de) * 1991-02-11 1992-08-26 Industria Grafica Meschi S.r.l. Vorrichtung zum Steuern einer Schleife für Papierbahnen
ES2062917A2 (es) * 1992-10-01 1994-12-16 Bayarri Carmen Vazquez Maquina para la produccion de rollos de cinta sin mandril, y rollo de cinta obtenido por dicha maquina.
EP0836887A1 (de) * 1996-10-15 1998-04-22 Adolf Illig Maschinenbau GmbH & Co Verfahren zum Steuern der Einzugwalzen einer Schneidmühle zum Zerkleinern des Restgitters einer vorgeschalteten Thermoformaschine und Schneidmühle zur Durchführung des Verfahrens
EP1302326A3 (de) * 2001-10-11 2003-12-17 Christian Dr. Bay Papiertransporteinrichtung zwischen einem Plotter und einem Falter

Also Published As

Publication number Publication date
JPH0233044A (ja) 1990-02-02
IT1234195B (it) 1992-05-06
EP0344698A3 (en) 1990-07-04
IT8820835A0 (it) 1988-06-02
ATE120694T1 (de) 1995-04-15
EP0344698B1 (de) 1995-04-05
DE68922021T2 (de) 1995-10-26
DE68922021D1 (de) 1995-05-11

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