JP2004292093A - Sheet feeder - Google Patents

Sheet feeder Download PDF

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Publication number
JP2004292093A
JP2004292093A JP2003085272A JP2003085272A JP2004292093A JP 2004292093 A JP2004292093 A JP 2004292093A JP 2003085272 A JP2003085272 A JP 2003085272A JP 2003085272 A JP2003085272 A JP 2003085272A JP 2004292093 A JP2004292093 A JP 2004292093A
Authority
JP
Japan
Prior art keywords
lever
paper
pickup roller
sheet feeding
sheet
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
JP2003085272A
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Japanese (ja)
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JP3941718B2 (en
Inventor
Yuji Hayashi
Taiichi Oonami
泰一 大南
祐次 林
Original Assignee
Minolta Co Ltd
ミノルタ株式会社
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 Minolta Co Ltd, ミノルタ株式会社 filed Critical Minolta Co Ltd
Priority to JP2003085272A priority Critical patent/JP3941718B2/en
Publication of JP2004292093A publication Critical patent/JP2004292093A/en
Application granted granted Critical
Publication of JP3941718B2 publication Critical patent/JP3941718B2/en
Expired - Fee Related legal-status Critical Current
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Abstract

Provided is a sheet feeding device which is thin and does not cause a sheet feeding defect.
A paper feeder includes a paper feed cassette for storing paper, a pickup roller for pulling out the paper from the paper feed cassette, and interlocking with attachment / detachment of the paper feed cassette to / from a paper feeder main body. A lifting unit 29 for raising and lowering the pickup roller 12; The elevating unit 29 includes a first lever 30 that operates in conjunction with the attachment of the sheet cassette 6 to the sheet feeding apparatus main body, and a second lever 30 that is connected to the first lever 30 via a torque limiter and supports the pickup roller 12. And a lever 32. The torque limiter causes the clockwise rotation of the second lever 32 around the axis 33 to be started later than the start of the clockwise rotation of the first lever 30 around the axis 33.
[Selection diagram] FIG.

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sheet feeding device. In particular, the present invention relates to a sheet feeding device that supplies sheets to an image forming apparatus such as a copier, a printer, or a multifunction peripheral thereof.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a sheet feeding device of an image forming apparatus such as a copying machine usually includes a pickup roller that feeds sheets stacked in a sheet feeding cassette to a sheet feeding roller. The pick-up roller rotates in contact with the uppermost sheet at the time of sheet feeding, and sends out the sheet to the sheet feeding roller, and the sheet feeding roller cooperates with a separating pad facing the roller to form an image of the image forming apparatus. The paper is fed one by one to the forming section.
[0003]
As such a paper feeder, there is known a paper feeder provided with a mechanism for raising and lowering a pickup roller in conjunction with attachment / detachment of a paper feed cassette to / from an image forming apparatus (paper feeder) main body (for example, see Patent Document 1). ). Specifically, this mechanism includes an arm that rotatably supports the pickup roller and is rotatable in conjunction with attachment and detachment of the sheet cassette. When the sheet cassette is detached, the arm is urged to hold the pickup roller supported at one end thereof at the raised position. When the paper feed cassette is mounted, the other end of the arm is engaged with a part of the paper feed cassette, and the arm holds the pickup roller supported by the one end at the lowered position against the urging force. Thereafter, the uppermost sheet is brought into contact with the pickup roller held at the lowered position by raising the push-up plate constituting the sheet stacking surface of the sheet cassette.
[0004]
[Patent Document 1]
JP 2001-294333 A
[Problems to be solved by the invention]
However, in the conventional configuration, it is attempted to reduce the distance between the pickup roller at the ascending position and the uppermost sheet when the sheet cassette is mounted by keeping the maximum number of sheets stored, thereby reducing the thickness of the sheet feeding device and hence the image forming apparatus. In this case, the distance between the lowering position of the pickup roller and the uppermost sheet when the paper cassette is mounted must be reduced. As a result, when the paper cassette is mounted, the uppermost sheet may hit the lowering pickup roller. There is. In this case, there is a possibility that the sheet may be laterally displaced or deflected, and a sheet feeding defect such as skew or jam may occur at the time of sheet feeding.
[0006]
Therefore, an object of the present invention is to provide a sheet feeding device which is thin and does not cause a sheet feeding defect.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a paper feeding device according to the present invention includes:
A paper cassette for storing paper,
A pickup roller for pulling out the paper from the paper cassette,
An elevating unit that raises and lowers the pickup roller in conjunction with attachment and detachment of the paper cassette to and from the paper feeding device main body,
An elevating unit, a first elevating member that operates in conjunction with the attachment of the sheet cassette to the main body of the sheet feeding device, a second elevating member connected to the first elevating member and supporting a pickup roller; A delay mechanism for starting the operation of the second elevating member that lowers the pickup roller in delay with the start of the operation of the elevating member.
[0008]
In such a paper feeder, the elevating unit for raising and lowering the pickup roller is divided into a first elevating member and a second elevating member, and the first elevating member starts operating in conjunction with the mounting of the paper cassette. However, the second elevating member that supports the pickup roller does not immediately start operating following the first elevating member. Therefore, even when the distance between the pickup roller and the uppermost sheet when the sheet cassette is mounted is reduced, the uppermost sheet can be configured not to hit the descending pickup roller when the sheet cassette is mounted. As a result, the sheet feeding device can be made thin.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment according to the present invention will be described below with reference to the accompanying drawings.
[0010]
1 and 2 show an embodiment of a sheet feeding device according to the present invention. The paper feeding device 2 includes a paper feeding cassette 6 for stacking the paper 4 (the paper is not shown in FIG. 1). The paper feed cassette 6 is moved along a pair of guide rails 8a and 8b provided on an image forming apparatus (paper feeder) main body (not shown) (hereinafter simply referred to as “main body”). It is designed to be able to slide between the separated position.
[0011]
The paper feeding device 2 also includes a paper feeding assembly 10 for feeding the paper 4 stacked on the paper feeding cassette 6 toward an image forming unit (not shown) of the image forming apparatus main body. Referring also to FIG. 3, the sheet feeding assembly 10 includes a pickup roller 12 disposed at a position facing the front end of the sheet 4 stacked in the sheet feeding cassette 6 and a downstream side of the pickup roller with respect to the sheet feeding direction. It includes a paper feed roller 14 arranged and a holder 16 for holding the rollers 12, 14. The sheet feeding assembly 10 is moved by a lifting unit described later between a lowering position in which the uppermost sheet 4 is approached or in contact with the uppermost sheet 4 and a rising position separated above the uppermost sheet 4 in conjunction with the attachment and detachment of the sheet feeding cassette 6. I can do it.
[0012]
The pickup roller 12 is fixed to a rotating shaft 18 rotatably supported by a holder 16. A gear 20 is fixed to the rotating shaft 18.
[0013]
The paper feed roller 14 is connected to a drive shaft 24 via a one-way clutch 22. The drive shaft 24 is rotatably supported by the holder 16. A gear 26 is fixed to the drive shaft 24. The gear 26 is connected to the gear 20 via an intermediate gear (not shown). The drive shaft 24 is driven to rotate in the direction of the arrow by a motor (not shown). When the drive shaft 24 rotates, the power of the drive shaft 24 is transmitted to the paper feed roller 14 by the action of the one-way clutch 22 and rotates in the direction of the arrow in the figure. At this time, the power of the drive shaft 24 is transmitted to the pickup roller 12 via the gear 26, the intermediate gear and the gear 20, and the pickup roller 12 rotates in the same direction as the sheet feeding roller 14. Even when the paper feed roller 14 rotates in the direction of the arrow due to the operation of the one-way clutch 22, power is not transmitted to the drive shaft 24 and thus to the pickup roller 12.
[0014]
Although not shown, the separating roller is in contact with the sheet feeding roller 14 in a state where the sheet feeding assembly 10 is set at the lowered position.
[0015]
The paper feed cassette 6 is provided with a push-up plate 28 as a paper mounting surface. When the paper feed cassette 6 is mounted on the main body, the push-up plate 28 moves upward toward the paper feed assembly 10 by driving means (not shown). The sheet feeding assembly 10 is provided with a sensor (not shown) for detecting the position of the uppermost sheet. When the uppermost sheet comes into contact with the pickup roller 12, the driving means stops the push-up plate 28. Has become.
[0016]
Next, an elevating unit that moves the sheet feeding assembly 10 to a lower position and an upper position in conjunction with attachment and detachment of the sheet cassette 6 to and from the main body will be described. The elevating unit 29 includes a first lever 30 and a second lever 32, which are elongated members. One end 30a of the first lever 30 and one end 32a of the second lever 32 are rotatably supported by a shaft 33 fixed to a frame (not shown). The first lever 30 is urged counterclockwise around the axis 33 in FIG. 2 so that the other end 30b faces the space where the sheet cassette 6 is inserted, and is moved to the initial position (in the dotted line 30A in FIG. 2). (The position shown). For this reason, in the example of the figure, one end 34a is fixed to a predetermined position (a fixed position is indicated by a dotted line 34a 'in FIG. 3) of the upper surface 30c of the first lever 30, and the other end 34b is fixed to the frame (not shown). The coil spring 34 thus wound is wound around the outer peripheral surface of a cylindrical portion 30e provided on one side surface 30d of one end 30a of the first lever 30 and concentric with the shaft 33.
[0017]
A projecting portion 16a projecting from the side surface of the holder 16 is rotatably connected to the other end 32b of the second lever 32 around the other end 32b. The holder 16 is held by a mechanism (not shown) such that the drive shaft 24 and the rotating shaft 18 are always parallel to the horizontal direction. As will be described later, the other end 32b of the second lever 32 also functions as a receiving portion for receiving the protruding portion 16a of the holder 16, and detaches the sheet feeding cassette 6 from the main body. When returning from the lowered position to the raised position, the movement of the paper feed assembly 10 can quickly follow the rotation of the second lever 32 around the axis 33 in the counterclockwise direction in FIG.
[0018]
With the first lever 30 urged by the coil spring 34 and set to the initial position 30A, the second lever 32 is held by the receiving plate 30f protruding from the vicinity of one end 30a of the first lever 30. Accordingly, the second lever 32 is also set to the initial position (the position indicated by the dotted line 34A in FIG. 2) by receiving the urging force from the coil spring 34, and holds the sheet feeding assembly 10 at the raised position. .
[0019]
When the other end 30b of the first lever 30 abuts on a part of the sheet cassette 6 (in the example in the drawing, the side surface 6a on the leading end side in the mounting direction), the first lever 30 is moved by the coil spring 34. When the lever 30 is rotated around the shaft 33 in the clockwise direction in FIG. 2 against the urging force, the receiving plate 30 f can be disengaged from the lower surface 32 c of the second lever 32. As a result, the second lever 32 rotates clockwise in FIG. 2 around the axis 33 due to the gravity of the sheet feeding assembly 10 and the weight of the second lever 32.
[0020]
As shown in FIG. 3, the first lever 30 and the second lever 32 are connected via a torque limiter 36. Specifically, the opposite side surfaces 30g and 32d of the one end 30a of the first lever 30 and the one end 32a of the second lever 32 are concentric with the shaft 33 and have the same outer diameter and the same material (for example, polyacetate). (Resin) cylindrical portions 30h and 32e are formed. A coil spring 38 is wound around the outer peripheral surfaces of the cylindrical portions 30h and 32e. The winding direction of the coil spring 38 is such that the first lever 30 is turned clockwise as viewed from the direction from one end 30a of the first lever 30 to one end 32a of the second lever 32 (that is, the direction in which the coil spring 34 is biased). The setting is such that the inner diameter of the coil is increased when rotating in the opposite direction (clockwise direction in FIG. 2). In other words, the transmission torque T1 of the torque limiter 36 when the first lever 30 rotates clockwise in FIG. 2 with respect to the coil spring 38 and the counterclockwise direction in FIG. The transmission torque T2 when rotating in the direction (direction) has a relationship of T2> T1. The transmission torque of the torque limiter 36 when the second lever 32 rotates in the clockwise direction in FIG. 2 (that is, the direction in which the sheet feeding assembly 10 is lowered) with respect to the coil spring 38 is equal to T2, and is counterclockwise in FIG. The transmission torque when rotating in the direction is equal to T1, and T2 is set to be smaller than the torque T about the axis 33 due to the gravity of the sheet feeding assembly 10 and the second lever 32.
[0021]
Next, an operation and a sheet feeding operation of the sheet feeding device 2 configured as described above in conjunction with the attachment and detachment of the sheet feeding cassette will be described.
[0022]
When the paper feed cassette 6 is not mounted on the main body, the first lever 30 is biased by the coil spring 34 and is set at the initial position 30A. At this time, the second lever 32 is set to the initial position 32A by the force received from the receiving plate 30f of the first lever 30. In this state, the sheet feeding assembly 10 is held at the raised position.
[0023]
Then, when the paper feed cassette 6 on which the paper 4 is loaded is mounted on the main body, first, the other end 30b of the first lever 30 contacts the side surface 6a of the paper feed cassette 6, and the first lever 30 is moved by the coil spring. 2 starts to rotate clockwise in FIG. At this time, since the inner diameter of the coil spring 38 of the torque limiter 36 increases, the coil spring 38 does not immediately follow the rotation of the first lever 30. Therefore, the second lever 32 connected to the first lever 30 via the coil spring 38 does not immediately follow the rotation of the first lever 30. In other words, when the first lever 30 starts rotating in conjunction with the mounting of the sheet cassette 6, the second lever 32 supporting the sheet feeding assembly 10 has not started rotating.
[0024]
When the receiving plate 30f comes off the lower surface 32c of the second lever 32 due to the rotation of the first lever 30, the second lever 32 is moved clockwise in FIG. Start turning. That is, the second lever 32 starts operating with a delay with respect to the movement of the first lever 30. When the second lever 32 starts rotating, the coil spring 38 of the torque limiter 36 has a smaller inner diameter and tightens the cylindrical portion 32e of the second lever 32, so that the coil spring 38 resists the rotation of the second lever 32. As a result, a torque of T2 is generated, and therefore, the lowering operation of the sheet feeding assembly 10 can be delayed.
[0025]
When the paper feed cassette 6 is completely mounted on the main body, the first lever 30 is moved to a paper feed position (a position shown by a solid line 30B in FIG. 2) in which the other end 30b is in contact with the side surface 6b of the paper feed cassette 6. Will be retained. The second lever 30b is held at the sheet feeding position (the position indicated by the solid line 32B in FIG. 2) supported again by the receiving plate 30f of the first lever 30. At this time, the sheet feeding assembly 10 is held at the lowered position. In this state, a part of the other end 32b of the second lever 30b is separated from the lower surface of the protrusion 16a of the holder 16, as shown in FIG.
[0026]
When the paper feed assembly 10 reaches the lowered position, the push-up plate 28 moves up until the uppermost sheet comes into contact with the pickup roller 12.
[0027]
At the time of paper feeding, the drive shaft 24 is rotated by the rotation of a motor (not shown), and the pickup roller 12 feeds the paper toward the paper feeding roller 14 from the uppermost side in contact with the roller 12. At this time, the sheet under the uppermost sheet may be sent out due to friction. However, the sheets other than the top sheet are separated from the top sheet by the separation roller (not shown) that comes into contact with the feed roller 14 rotating in the opposite direction to the feed roller 14, and the paper from the top is supplied from here. It is forbidden.
[0028]
When the paper cassette 6 is detached, the first lever 30 is released from a state in which the other end 30b is in contact with the side surface 6a of the paper cassette 6, and receives the urging force of the coil spring 34 to rotate around the shaft 33. Then, it starts to rotate counterclockwise in FIG. While the second lever 32 is supported by the receiving plate 30f of the first lever 30, the rotation of the first lever 30 is simultaneously started around the shaft 33 together with the first lever 30 in the counterclockwise direction in FIG. To rotate. When the second lever 32 rotates and is supported by the receiving portion 32b, the sheet feeding assembly 10 rotates around the shaft 33 in the counterclockwise direction in FIG. 2 together with the second lever 32. As described above, when the paper feed cassette 6 is pulled out from the main body, the first and second levers 30 and 32 and the paper feed assembly 10 rotate substantially simultaneously, so that the paper 4 remains in the paper feed cassette 6. Even if the uppermost sheet is in contact with the pickup roller 12, the sheet can be prevented from being pulled out while being in contact with the pickup roller 12 and deformed due to warpage or distortion.
[0029]
The above description relates to one embodiment of the present invention, and the present invention is not limited to this, and can be variously modified. For example, in the above-described embodiment, between the first lever 30 that rotates around the shaft 33 in conjunction with the insertion of the paper feed cassette 6 and the second lever 32 that supports the paper feed assembly 10, that is, the pickup roller 12. Although the torque limiter 38 is provided, the mechanism is not limited to the torque limiter 38 as long as the mechanism is to delay the start of the operation of the first lever 30 and start the operation of the second lever 32. For example, instead of providing the torque limiter 38, the first plate 30 is connected between the receiving plate 30f of the first lever 30 and the lower surface 30c of the second lever 32 via an elastic member such as a spring. Even if the receiving plate 30f of the lever 30 moves in the direction of retreating from the lower surface 30c of the second lever, the second lever 32 can start to operate with a delay from the movement of the first lever 30. Alternatively, one end of the elastic member is fixed to the upper surface of the second lever 32, not between the first lever 30 and the second lever 32, and the other end is fixed to a frame (not shown) located above the upper surface. A similar effect can be obtained.
[0030]
Further, the torque limiter 38 is not limited to the configuration using the coil spring 36 as in the above embodiment, but may be a magnetic type or the like.
[0031]
【The invention's effect】
According to the present invention, the second elevating member (the second elevating member) that lowers the pickup roller is delayed with respect to the start of the operation of the first elevating member (the first lever) that operates in conjunction with the mounting of the sheet cassette. 2) is started, so that even when the distance between the pickup roller at the ascending position and the uppermost sheet when the sheet cassette is mounted is reduced, the top sheet is lowered when the sheet cassette is mounted. It can be prevented from hitting the roller. As a result, it is possible to reduce the thickness of the sheet feeding device.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view showing an embodiment of a sheet feeding device according to the present invention.
FIG. 2 is a sectional view taken along the line II-II in FIG.
FIG. 3 is an enlarged exploded perspective view showing the sheet feeding assembly and the elevating mechanism of FIG. 1;
[Explanation of symbols]
2: paper feeder, 4: paper, 6: paper feed cassette, 12: pickup roller, 28: push-up plate, 29: elevating unit, 30: first lever, 32: second lever, 33: shaft, 36 : Torque limiter, 38: coil spring.

Claims (5)

  1. A paper cassette for storing paper,
    A pickup roller for pulling out the paper from the paper cassette,
    An elevating unit that raises and lowers the pickup roller in conjunction with attachment and detachment of the paper cassette to and from the paper feeding device main body,
    The lifting unit includes a first lifting member that operates in conjunction with the mounting of the paper cassette to the paper feeding device main body, a second lifting member that is connected to the first lifting member and supports a pickup roller, And a delay mechanism for starting the operation of the second elevating member for lowering the pickup roller by delaying the start of the operation of the elevating member.
  2. The first elevating member includes a first lever having a first end and a second end that can contact a sheet cassette mounted on the sheet feeding device main body,
    The second elevating member includes a second lever having a third end supporting the pickup roller and a fourth end facing the second end of the first lever,
    The delay mechanism connects the first lever and the second lever, and rotates the second lever in the direction to lower the pickup roller around the fourth end of the second lever by the first lever. 2. The sheet feeding device according to claim 1, further comprising an elastic member for starting the rotation around the end of the second member in the above-mentioned direction with a delay.
  3. 3. The paper feeder according to claim 2, wherein the elastic member includes a torque limiter disposed between a second end of the first lever and a fourth end of the second lever.
  4. The above-mentioned torque limiter has circular projections provided on the opposite portions of the second end of the first lever and the fourth end of the second lever, and is wound around these projections. The sheet feeding device according to claim 3, further comprising a coil spring.
  5. In the torque limiter, the transmission torque T1 related to the rotation of the first lever around the second end in the above-described direction is rotated around the second end of the first lever in the direction opposite to the above-mentioned direction. The sheet feeding device according to claim 3, wherein the sheet feeding device is configured to be smaller than a transmission torque T <b> 2.
JP2003085272A 2003-03-26 2003-03-26 Paper feeder Expired - Fee Related JP3941718B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003085272A JP3941718B2 (en) 2003-03-26 2003-03-26 Paper feeder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003085272A JP3941718B2 (en) 2003-03-26 2003-03-26 Paper feeder

Publications (2)

Publication Number Publication Date
JP2004292093A true JP2004292093A (en) 2004-10-21
JP3941718B2 JP3941718B2 (en) 2007-07-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
JP2003085272A Expired - Fee Related JP3941718B2 (en) 2003-03-26 2003-03-26 Paper feeder

Country Status (1)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8123211B2 (en) 2008-07-10 2012-02-28 Kabushiki Kaisha Toshiba Pickup roller lifting and lowering mechanism in paper feeding unit and image forming apparatus including the pickup roller lifting and lowering mechanism
JP2014088227A (en) * 2012-10-29 2014-05-15 Brother Ind Ltd Image forming device
JP2015086071A (en) * 2013-09-25 2015-05-07 キヤノン株式会社 Sheet feeding device and image forming apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8123211B2 (en) 2008-07-10 2012-02-28 Kabushiki Kaisha Toshiba Pickup roller lifting and lowering mechanism in paper feeding unit and image forming apparatus including the pickup roller lifting and lowering mechanism
JP2014088227A (en) * 2012-10-29 2014-05-15 Brother Ind Ltd Image forming device
JP2015086071A (en) * 2013-09-25 2015-05-07 キヤノン株式会社 Sheet feeding device and image forming apparatus
US9272861B2 (en) 2013-09-25 2016-03-01 Canon Kabushiki Kaisha Sheet feeding unit and image forming apparatus

Also Published As

Publication number Publication date
JP3941718B2 (en) 2007-07-04

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