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EP0921082B1 - Spring clutch control mechanism for a sheet feeding device - Google Patents

Spring clutch control mechanism for a sheet feeding device Download PDF

Info

Publication number
EP0921082B1
EP0921082B1 EP19980310035 EP98310035A EP0921082B1 EP 0921082 B1 EP0921082 B1 EP 0921082B1 EP 19980310035 EP19980310035 EP 19980310035 EP 98310035 A EP98310035 A EP 98310035A EP 0921082 B1 EP0921082 B1 EP 0921082B1
Authority
EP
European Patent Office
Prior art keywords
pickup roller
rotation
driving gear
sheet feeding
reverse
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 - Lifetime
Application number
EP19980310035
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0921082A1 (en
Inventor
Jin-Ho Park
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.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Electronics Co Ltd
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
Priority claimed from KR1019970066683A external-priority patent/KR100242849B1/ko
Priority claimed from KR2019970040881U external-priority patent/KR200162391Y1/ko
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Publication of EP0921082A1 publication Critical patent/EP0921082A1/en
Application granted granted Critical
Publication of EP0921082B1 publication Critical patent/EP0921082B1/en
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
    • B65H3/00—Separating articles from piles
    • B65H3/02—Separating articles from piles using friction forces between articles and separator
    • B65H3/06—Rollers or like rotary separators
    • B65H3/0669—Driving devices therefor

Definitions

  • the present invention relates to an automatic sheet feeding device, for feeding sheets to a printer for example, one by one.
  • a printer as shown in FIG. 1, comprises a sheet feeding station 120 for feeding record sheets into the printer, a paper transporting station 150 for transporting the sheets fed from the sheet feeding station 120 to the printing position, a printing station 140 for printing data onto the sheet transported by the transporting station 150 and a sheet discharging station 160 for discharging the sheet printed by the printing station 140, the printing station 140 is installed on a main board 112 mounted within a case 111.
  • the printing station 140 comprises at least one ink head 142 having nozzles (not illustrated) to jet ink and a carriage 141 for carrying the ink head 142.
  • the ink head 142 is mounted on the carriage 141, carries out printing of the data by jetting ink through nozzles on the sheet transported by the sheet transporting station 150 while being moved according to the left and right movement of the carriage 141.
  • the sheet feeding station 120 comprises a sheet feeding plate 122 in which a number of sheets 100 are loaded and a semicircular pickup roller 124 for picking up the sheet 100 loaded in the sheet feeding plate 122 and transporting it to the sheet transporting station 150.
  • the sheets loaded on the sheet feeding plate 122 are pressed upwardly by the spring force of a sheet feeding spring 119 positioned between an upper portion of the frame 121 and a lower portion of the sheet feeding plate 122.
  • the uppermost sheet 100 is contact with the pickup roller 124 and picked up by rotation of the pickup roller 124.
  • the sheets 100 picked up by the pickup roller 124 pass through a path between a friction roller 151 and a feed roller 152 located at the sheet transporting station 150 along a feeding path and are transported to the printing position by the rotation of the friction roller 151 and the feed roller 152.
  • the sheet arrives at the sheet discharging station 160 after passing through a base from 161
  • the sheet is discharged out of the printer by the rotation of a sheet contacting wheel 162 and a sheet discharging roller 163 located at the sheet discharging station 160.
  • the feed roller 152 which transports the sheet to the printing position in cooperation with the friction roller 151, is engaged with a gear 126 mounted on a motor 125 through a gear 128, which is mounted on a shaft of the feed roller 152 and in turn a pinch gear 127 and is rotated by the driving of a motor 125.
  • the driving force of the motor 125 is transferred to the pickup roller 124 through a gear 129 which is mounted on a pickup shaft.
  • the driving force of the motor 125 is transferred to the gear 129 through an idle gear 132, the rotation of the gear 129 is transferred to the pickup roller 124 when the motor 125 is driven in the forward direction, but is not transferred to the pickup roller 124 when the motor 125 is driven in the reverse direction, by a one-way clutch.
  • the sheet feeding plate 122 is operated by the action of a cam 135 being mounted on a cam roller 134.
  • the cam roller 134 is rotated by the driving force of the motor 125 transferred through the idle gears 132, 133.
  • the sheet feeding plate 122 is lifted up by the action of the cam 135 by the rotation of the cam roller 134, to which the driving force is transferred from the pinch gear 127 through the idle gears 130 to 133, so that the uppermost sheet is contacted with the pickup roller 124 and the driving gear 129 is driven in the forward direction so that the uppermost sheet can be picked up to transport it to the feed roller 152 by the semicircular pickup roller 124.
  • the pickup roller 124 When the pickup roller 124 is positioned as shown in FIG. 2, while the sheet is picked up by the pickup roller 124 and transported toward the feed roller 152, the position of the pickup roller 124 is sensed by a sensor 136 and the motor 125 is driven in reverse according to the signal of the sensor 136 during a predetermined time and the feed roller 152 is driven in reverse by the reverse rotation of the motor 125.
  • the motor 125 When the motor 125 is driven in reverse, the reverse rotation of the pickup roller 124 is prevented by the interruption of the driving force of the motor 125 by the action of the one-way clutch. Accordingly, the sheet 100 is curled by the reverse rotation of the feed roller 152 as illustrated in FIG. 2.
  • the object of this reverse rotation of the feed roller 152 is to align the leading end of the sheets 100 (the end part of the sheet toward the printer) in order to prevent printing error which may occur when the sheets 100 are not aligned.
  • the sheet is fed from the pickup roller 124 to the feed roller 152 and at the same time the picking up from the pickup roller 124 is finished and the sheet 100 can be aligned precisely.
  • the motor 125 can be rotated in reverse by the sensing signal of the sensor 136, as above described, but this matter for rotating the motor 125 in reverse direction using the sensor 136 requires a complicated device, thus a ratchet wheel 252 and a ratchet 248 have been employed for use in rotating the motor 125 in reverse without using the sensor.
  • the one-way clutch for preventing the reverse rotation of the pickup roller 124 and the structure for during the motor 125 in reverse at a proper time are illustrated approximately in FIG. 3.
  • the driving gear 129 which transfers the driving force of the motor 125 to the pickup roller 124 through the pickup shaft 241, is mounted on a pickup shaft 241, on a side of the driving gear 129, there are formed a first cylindrical portion 291 having a large diameter and a second cylindrical portion 292 having a small diameter.
  • the first cylindrical portion 291 has a groove 246a formed along the circumference direction.
  • a pushing member 247 having a right shape, to each end of which a protrusion 247a is provided, is received in the groove 246a.
  • the second cylindrical portion 292 is extended from the first cylindrical portion 291 to the outside of the pickup shaft 241.
  • a spring clutch 251 is mounted on the outer circumference of the second cylindrical portion 292, the spring clutch 251 is made of a coil spring being wound in the reverse rotation direction of the pickup shaft 241.
  • One end 251a of the spring clutch 251 is fixed to the gear 129 or a ratchet wheel 252 and the other end is fixed to a recess 257 formed in a hub 254 and the hub 254 is fixed to the end surface of the pickup shaft 241 by a fastener 258 such as a bolt.
  • the one end portion of the ratchet wheel 252 is apart from the end portion of the first cylindrical portion 291 by a predetermined distance by the hub 254 and the ratchet wheel 252 is mounted so as to enclose the spring clutch 251 mounted on the cylindrical portion 292.
  • the ratchet wheel 252 has a notch 253 formed in the one side as shown in FIG. 3, this notch 253 is engaged with a ratchet 248 of the ratchet member 250 being pivotally mounted to a hole 244 formed in the sheet feeding station 120.
  • a claw member 249 is provided near the mounting location of the pin 250a and the claw member 249 is inserted into a fan-shaped hole 245 formed in the sheet feeding station 120. Accordingly, when the ratchet member 250 is pivoted about the pin 250a, the claw member 249 is guided along the fan-shaped hole 245.
  • the ratchet member 250 is mounted on the sheet feeding station 120, the ratchet member 250 from the sheet feeding station 120 can be prevented from separating, as a claw 249a formed in the end portion of the claw member 249 is caught on the hole 245.
  • the ratchet member 250 is provided with a protrusion 248a being protruded toward the sheet feeding station 120, the protrusion 248a is positioned between protrusions 247a of the pushing member 247 when the ratchet member 250 is mounted on the sheet feeding station 120.
  • the spring clutch 257 pulls the hub 254 to closely contact the one end portion surface of a ratchet wheel 252 with the first cylindrical portion 291a of the driving gear 129 and then the driving gear 129 is closely contacted with the pickup shaft 241, so that the driving force of the driving gear 129 is transferred to the pickup roller 124.
  • the spring clutch tightens onto the second circumferential part 292 of the driving gear 129 and the corresponding part of the hub 254.
  • driving engagement between the driving gear 129 and the hub 254 is ensured.
  • the ratchet wheel is also driven, by virtue of being affixed to one end of the spring 251.
  • the motor 125 is rotated in reverse for aligning the sheet 100 and the feed roller 152 is rotated in reverse by the reverse rotation of the motor 125 as shown in FIG. 2.
  • the reverse driving force of the motor 125 is transferred to the driving gear 129 through a number of gears, whereby the driving gear 129 also is rotated in reverse.
  • the driving gear 129 As the driving gear 129,a the pickup shaft 241 are released from the close contact to the driving gear 129 by loosening of the coil of the spring clutch 251.
  • the driving gear 129 When the driving gear 129 is rotated in reverse, the reverse rotation force of the driving gear 129 is not transferred to the pickup roller 124 by the spring clutch 251 as above described.
  • the reverse rotation is run for a short time, reverse rotation of the pickup roller 124 caused by the deformation of the spring clutch 257 does not take place.
  • the spring clutch 251 since the spring clutch 251 is wound in the reverse rotation direction of the driving gear 129, when the driving gear 129 is rotated forward, the ratchet wheel 252 is rotated in the same direction as the rotation direction of the driving gear 129. However, since the ratchet wheel 252 is apart from the driving gear 129 by the action of the spring clutch 251 when the driving gear 129 is rotated in reverse, the driving force of the driving gear 129 is not transferred to the ratchet wheel 252. And so the ratchet wheel 252 comes to a still stand, restrained for example by being connected to the spring 251.
  • the sheet feeding plate 122 is operated by the cam mounted on the cam roller 134 and when a circular portion of the cam 135 is contacted with a movable member 134 connected to the sheet feeding plate 122, the sheet feeding plate 122, as shown in FIG. 1, is pressed by a sheet feeding place spring 119 toward the pickup roller 124 so as to feed the sheet to the printer and so brings the pickup roller 124 into contact with the sheet 100.
  • the sheet feeding plate 122 is apart from the pickup roller 124 against the sheet feeding plate spring 119.
  • the operation cycle of this time is in printing or in a standby status for feeding the sheet.
  • the automatic sheet feeding device of the conventional printer has a structure to drive the pickup roller after bringing the ratchet in a predetermined distance apart from the position of the combination with the notch of the ratchet wheel using the reverse rotation of the feed roller in order to prevent the restraint of the rotation of the pickup roller due to the combination of the ratchet with the notch of the ratchet wheel when the pickup roller is rotated forward to feed the sheet after the reverse rotation of the feed roller.
  • an automatic sheet feeding device comprising: a pickup roller for picking up a record sheet from a sheet feeding plate in response to forward rotation of a driving gear; and means for restraining forward rotation of the pickup roller and then to release the pickup roller to allow its forward motion to continue.
  • EP 0 590 642 discloses an automatic sheet feeding device comprising: a pickup roller for picking up a record sheet from a sheet feeding plate in response to forward rotation of a driving gear; and means for preventing the pickup roller from rotating in reverse when the driving gear is rotated in reverse.
  • an automatic sheet feeding device comprising:
  • the first circumferential formation on the first rotation member is normally in advance of the second circumferential formation on the second rotation member by approximately 3 degrees.
  • the device may further comprise a switching member that normally rotates with the driving gear and is adapted to release the stopping member from the first circumferential formation on the first rotation member, when the driving gear is rotated in reverse.
  • the means for preventing the pickup roller from rotating in reverse may comprise:
  • the device may further comprise a sheet feeding plate actuator for reciprocating the sheet feeding plate in association with the operation of the pickup roller.
  • a driving gear 2 is mounted on a pickup shaft 3 and rotates a pickup roller 1, which is mounted on the pickup shaft 3, in a forward direction by a forward direction driving of a motor (not illustrated) as described above.
  • the pickup roller 1 picks up a sheet, which is loaded on a sheet feeding plate by the forward rotation of the driving gear 2 and feeds the sheet to a printer.
  • the driving gear 2 is provided with a first cylindrical portion 2a extending a little distance toward an end portion of the pickup shaft 3.
  • a spring clutch 4 which is wound by the reverse rotation of the pickup roller 1 in a same manner as the conventional automatic sheet feeding device, is positioned in the first cylindrical portion 2a.
  • the spring clutch 4 is fixed to a groove 7a of a hub 7, one end portion 4a of which is fixed to the driving gear 2 and the other end portion 4b is fixed to an end portion of the pickup shaft 3.
  • the hub is fixed to an end 11 of the pickup shaft 3 by a fastener 9 such as a bolt.
  • a ratchet wheel 5 which is positioned to cover the spring clutch 4 positioned in the first cylindrical portion 2a of the driving gear 2, is closely contacted to the driving gear 2 by the hub 7.
  • a notch 6 is engaged with a ratchet 12, which is pivotally mounted on the side of the sheet feeding station when the pickup shaft 3 is rotated.
  • the motor stops driving forward according to a sensing means such as a sensor or a predetermined program and is rotated for rotating a feed roller (not illustrated) in reverse so as to form the sheet in line.
  • a claw member 14 offered near the hole 12a penetrated by the pin 13 is inserted into a fan-shaped hole 16 formed in the sheet feeding station. Accordingly, when the ratchet 12 is rotated centring around the pin 13, the claw member 14 can be rotated along the fan-shaped hole 16.
  • a claw 14a formed on end of the claw member 14 gets caught on the hole 16 and is the secession of the ratchet 12 from the sheet feeding station can be prevented.
  • Such ratchet wheel 5 and ratchet 12 construct a mechanism for restraining the rotation determining a point of time for reverse rotation of the driving gear 2. Meanwhile, when the driving gear 2 stops rotating in reverse, a protrusion 8 formed on the hub 7 has a function of the mechanism for releasing the rotation restraint of the ratchet wheel 5 by the ratchet wheel 5 and the ratchet 12 (the mechanism for restraining the rotation of a pickup roller).
  • the protrusion 8 formed on the hub 7 is positioned in a predetermined angle, about angle of 3 degrees backward from the notch 6 in a forward rotation direction of the pickup roller 1 and is formed in higher position than the notch 6 so as to push out the ratchet 12 in order that the combination of the ratchet 12 with the notch 6 can be released from the combination position.
  • the pickup roller 1 is rotated forward, as shown in FIG. 6B, by the forward direction driving of the motor, in the state that the notch 6 of the ratchet wheel 5 mounted on the pickup shaft 3, as shown in FIG. 6A, is engaged with the ratchet 12.
  • the hub 7 mounted on the pickup shaft 3 is rotated by the rotation of the pickup shaft 3 and here the force is applied to the spring clutch 4 in the loosening direction of the coil.
  • the protrusion 8 formed on the outer circumference of the hub 7 comes in contact with the ratchet 12 and the ratchet 12 is pushed out by the contact with the protrusion 8 so as to be released from the combination with the notch 5 and so the ratchet wheel 5 becomes rotated together with the pickup shaft 3, namely the pickup roller 1.
  • a pushing member 17, to each end of which protrusions 17a, 17b, which push out the ratchet 12 from the combining position with the notch 5 of the ratchet wheel 7, are offered, can be mounted on the driving gear 2 as in a conventional case.
  • pushing member 17 may be omitted as it has been described in detail previously. Likewise, as the pushing member 17 is offered to the driving gear 2, the deformation of the spring clutch 4 can be prevented doubly.
  • the automatic sheet feeding device of the printer according to the present invention can be provided desirably with a means for preventing the pickup roller 1 from rotating in reverse, as shown in FIG. 7 and FIG. 8, in order to prevent the reverse rotation of the pickup roller 1 when the driving gear 2 is rotated in reverse.
  • the means for preventing the pickup roller 1 from rotating in reverse can be described as follows.
  • a ratchet wheel member 18 is positioned on the other end portion of the pickup shaft 3, to which the cam 22 is offered within the scope of the angle, in which the pickup roller 1 becomes apart from the sheet feeding plate.
  • the outer diameter is formed in semicircular shape centring around the pickup shaft 3 and a number of the teeth of a saw 19a of the pickup roller 1 are formed in the outer diameter.
  • the ratchet wheel member 18 prevents the reverse rotation of the pickup roller 1 in cooperation with a stopper lever 20 being pivotally mounted on the sheet feeding station 21 and the stopper lever 20 has a same inner diameter as the outer diameter of the ratchet wheel 18 and the inner diameter is provided with a number of the teeth of a saw 18a being engaged with the teeth of a saw 20a formed on the ratchet wheel member 18.
  • teeth of saws 18a, 20a are formed so as to prevent the reverse rotation of the pickup roller 1 when they are engaged with each other and they are formed to be easily engaged when the ratchet wheel member 18 is rotated to be contacted with the stopper lever 20. Because the stopper lever 20 is pressed toward the ratchet wheel member 18 by the spring 23, the teeth of saws 18a, 20a can be engaged easily and surely with each other when the ratchet wheel member 18 approaches to the stopper lever 20 by the rotation of the pickup shaft 3.
  • the automatic sheet feeding device of the present invention as the rotation force of the pickup shaft due to the reverse rotation of the pickup shaft is surely prevented from being transferred to the spring clutch in the state that the ratchet is engaged with the notch after the arrangement of the sheet is completed by the reverse rotation of the motor, the obstacle of the sheet feed due to the deformation of the spring clutch caused by the rotation force of the pickup shaft can be prevented.
  • the obstacle of the sheet feed caused by the reverse rotation of the pickup roller can be prevented by the sure prevention of the reverse rotation of the pickup roller.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Handling Of Cut Paper (AREA)
EP19980310035 1997-12-08 1998-12-08 Spring clutch control mechanism for a sheet feeding device Expired - Lifetime EP0921082B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR1019970066683A KR100242849B1 (ko) 1997-12-08 1997-12-08 잉크젯프린터의급지구동장치
KR9766683 1997-12-08
KR9740881 1997-12-26
KR2019970040881U KR200162391Y1 (ko) 1997-12-26 1997-12-26 잉크젯프린터용 픽업롤러의 역회전 방지장치

Publications (2)

Publication Number Publication Date
EP0921082A1 EP0921082A1 (en) 1999-06-09
EP0921082B1 true EP0921082B1 (en) 2002-06-26

Family

ID=26633025

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980310035 Expired - Lifetime EP0921082B1 (en) 1997-12-08 1998-12-08 Spring clutch control mechanism for a sheet feeding device

Country Status (4)

Country Link
EP (1) EP0921082B1 (zh)
JP (1) JP3083509B2 (zh)
CN (1) CN1165471C (zh)
DE (1) DE69806220T2 (zh)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3635003B2 (ja) * 2000-05-17 2005-03-30 理想科学工業株式会社 給紙装置及びこれを用いた印刷装置
KR100464091B1 (ko) 2002-12-18 2005-01-03 삼성전자주식회사 클러치 장치
JP2008030888A (ja) * 2006-07-27 2008-02-14 Toshiba Corp 給紙装置および画像形成装置および給紙装置の制御方法
CN103121597A (zh) * 2011-11-18 2013-05-29 致伸科技股份有限公司 自动馈纸装置
CN103253004A (zh) * 2012-02-15 2013-08-21 致伸科技股份有限公司 热转印打印装置
CN103660618B (zh) * 2013-11-21 2015-10-21 浙江大学 便捷取纸装置
CN104014872B (zh) * 2014-05-19 2016-08-24 潍坊翰顿数控设备有限公司 围字机
CN104044373A (zh) * 2014-06-20 2014-09-17 张晓玲 一种自动报警打印机
CN104339896B (zh) * 2014-10-13 2017-10-10 徐广宇 一种无级调节行程的单向驱动机构
WO2017119899A1 (en) 2016-01-08 2017-07-13 Hewlett-Packard Development Company, L.P. Roller locks
KR20180005083A (ko) * 2016-07-05 2018-01-15 에스프린팅솔루션 주식회사 급지 장치, 이를 채용한 매체 처리 장치, 및 화상형성장치
CN109661313B (zh) * 2016-09-07 2021-01-01 惠普发展公司，有限责任合伙企业 利用单向离合器和扭矩限制器的拾取臂升高
CN108175183B (zh) * 2018-01-30 2020-07-14 嘉兴市新丰特种纤维有限公司 纸张快速切换装置
CN111252587B (zh) * 2018-11-30 2021-07-09 东友科技股份有限公司 分离爪及其适用的离合结构
CN109809218B (zh) * 2019-03-30 2023-09-01 国望科技(浙江)有限公司 一种印刷机的给纸传动机构

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61226424A (ja) * 1985-03-29 1986-10-08 Canon Inc 給送装置
JP2607956B2 (ja) * 1989-06-08 1997-05-07 キヤノン株式会社 駆動力伝達機構

Also Published As

Publication number Publication date
DE69806220D1 (de) 2002-08-01
EP0921082A1 (en) 1999-06-09
DE69806220T2 (de) 2003-03-06
JPH11236133A (ja) 1999-08-31
CN1220946A (zh) 1999-06-30
CN1165471C (zh) 2004-09-08
JP3083509B2 (ja) 2000-09-04

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