JP2010285252A - Manual paper feeder and image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manual paper feeder and an image forming device easy in user operation and capable of switching a carrying force by a simple constitution. <P>SOLUTION: The manual paper feeder includes a manual feeding tray 15 arranged in an image forming device body R1 so as to be openable and closable with a horizontal shaft as a rotary fulcrum 16, an energizing means 18 for energizing a bottom plate 19 toward a paper feeding roller 1c, an energizing force changing means 17 for changing an energizing force of the energizing means, tray opening/closing detecting means 20 and 20a for detecting that the manual feeding tray 15 exists in an opening position or a closing position, and a sheet inserting opening for inserting a sheet between the paper feeding roller 1c and the bottom plate 19 from the lower end of the manual feeding tray 15 when the manual feeding tray 15 exists in the closing position. When the tray opening/closing detecting means 20 and 20a detect opening/closing of the manual feeding tray 15, the energizing force changing means 17 changes the energizing force for energizing the bottom plate 19 toward the paper feeding roller 1c. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a manual sheet feeding device used in an image forming apparatus such as a printer, a facsimile machine, and a copying machine, and an image forming apparatus including the manual sheet feeding device.

  Generally, a sheet such as a thick paper having high rigidity or an OHP sheet having a high smoothness in the sheet feeding mechanism has a particularly high conveying force because the conveying force tends to be lost on the sheet conveying path or by a pad or roller that frictionally separates the sheet. Is required.

  In order to provide such a high conveying force, the conveying force can be increased by increasing the biasing pressure in the engaging paper feed roller nip. However, if the urging pressure is increased, the frictional force will naturally increase, and the roller nip portion will be heavily worn, which poses a significant risk for the intended durability life. Further, it is known that in a mechanism having a friction pad system in the paper separation unit, the frictional force increases, so that the paper handling sound due to the stick-slip phenomenon of the pad portion easily occurs and unpleasant noise is generated during use. Therefore, there are many cases where a mechanism such as an urging pressure switching lever that can be operated by the user is installed only when it is necessary to feed strong paper. Alternatively, a mechanism having a control system for automatically switching the urging force by a motor, a solenoid or the like in order to reduce the number of action operations by the user is also known.

  On the other hand, the technique of Patent Document 1 discloses that the lower opening formed when the manual feed tray is closed in the manual paper feeder can be used as a single manual feed. However, since the sheet feeding pressure variable mechanism described above is not provided, the above-described sheet conveyance problem occurs when a manual feed tray is used.

  On the other hand, providing the above-described conventional bias pressure switching mechanism on the manual feed tray complicates the apparatus, and a mechanism for switching the bias pressure by the user by lever operation or the like depending on the paper type is likely to cause an erroneous operation. If the control mechanism for switching to is provided, the number of components and power consumption increase, leading to an increase in cost. Moreover, there is a problem that the apparatus becomes larger due to the increase in the number of parts.

  SUMMARY An advantage of some aspects of the invention is that it provides a manual sheet feeding device and an image forming apparatus that can be easily operated by a user and that can switch a conveying force with a simple configuration.

  The present invention relates to a manual feed tray that is provided in an image forming apparatus main body so as to be freely opened and closed with a horizontal axis as a rotation fulcrum, a paper feed roller that feeds paper placed on the manual feed tray to the image forming apparatus main body, and a paper feed roller , A biasing means for biasing the bottom plate toward the paper feed roller, a biasing force changing means for changing the biasing force of the biasing means, and the manual feed tray 7 are in the open position or the closed position. A tray opening / closing detection means for detecting this, and a sheet insertion opening for inserting a sheet between the paper feed roller and the bottom plate from the lower end of the manual feed tray when the manual feed tray 7 is in the closed position, When the opening / closing of the manual feed tray is detected, the urging force changing means changes the urging force for urging the bottom plate toward the paper feed roller.

  According to the present invention, when the sheet is conveyed from the manual feed tray with the manual feed tray opened, and when the sheet is conveyed from the sheet insertion opening with the manual feed tray closed, the sheet feeding roller and the bottom plate are fed. The paper pressure can be changed, and the user can select a different conveyance force when manually feeding paper.

1 is a cross-sectional view illustrating a schematic configuration of an image forming apparatus including a sheet feeding device according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view illustrating a schematic configuration when a manual tray is in an open position in the manual sheet feeder illustrated in FIG. 1. FIG. 2 is a cross-sectional view illustrating a schematic configuration when a manual tray is in a closed position in the manual sheet feeding device illustrated in FIG. 1. 3 is a graph illustrating a relationship between a sheet feeding pressure and a sheet handling force in the manual sheet feeding device illustrated in FIG. 1. FIG. 6 is a cross-sectional view illustrating a schematic configuration of an image forming apparatus including a manual sheet feeding device according to a second embodiment of the present invention. It is sectional drawing which shows the structure of the principal part of the manual sheet feeder which concerns on 3rd Embodiment of this invention. It is sectional drawing which shows the structure of the principal part of the manual sheet feeder which concerns on 4th Embodiment of this invention. It is sectional drawing which shows the structure of the principal part of the manual sheet feeder which concerns on 5th Embodiment of this invention. It is sectional drawing which shows the structure of the principal part of the manual sheet feeder which concerns on 6th Embodiment of this invention. It is sectional drawing which shows the structure of the principal part of the manual sheet feeder which concerns on 7th Embodiment of this invention. FIG. 11 is a front view of the manual sheet feeder illustrated in FIG. 10. It is a front view of the manual sheet feeder concerning an 8th embodiment of the present invention.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. The image forming apparatus R according to the present embodiment is an electrophotographic color image forming apparatus such as a copying machine or a printer that develops using toner.

  As shown in FIG. 1, the image forming apparatus R includes a sheet feeding unit 1A and an image forming unit 1B, and the stacked sheet bundle P2 of the sheet feeding cassette 41 is 1 by a sheet feeding roller 1a in the sheet feeding unit 1A. The sheets are separated one by one, and reach the pair of transfer driving rollers 4b and 5 through the pair of registration rollers 2 and 3. The stacked sheet bundle of the sheets P1 on the manual feed tray 15 is conveyed by the sheet feeding roller 1c, separated one by one by the sheet feeding roller 1b, and reaches the pair of transfer driving rollers 4b and 5 through the registration roller pairs 2 and 3. .

  In the image forming unit 1B, a developer image is formed on the intermediate transfer belt 4a from the photoreceptors 6 to 9 corresponding to the developer of each color (cyan, yellow, magenta, black), and the color image is transferred onto the sheet by the transfer roller 4b. Then, the image is heated and fixed by the pair of fixing rollers 10 and 11, and the sheet is discharged to the paper discharge unit 14 by the pair of paper discharge rollers 12 and 13.

  In the manual sheet feeder 1C, as shown in FIGS. 2 and 3, the manual tray 15 attached to the image forming apparatus main body R1 so as to be openable and closable is supported and fixed to the image forming apparatus main body R1. It can be opened and closed by turning around a rotation fulcrum 16.

  The bottom of the sheet (sheet) P1 loaded on the manual feed tray 15 is pressed against the sheet feeding roller by a sheet feeding roller (sheet feeding roller) 1c and an elastic member (hereinafter referred to as “sheet feeding pressure spring”) 18. 19 is narrowed by 19 and receives the conveying force of the clockwise sheet feeding roller 1c and is conveyed downstream.

  The manual feed tray 15 is integrally provided with a protrusion (engagement protrusion) 20 that protrudes from the lower surface in the vicinity of the rotation fulcrum 16, and the image forming main body R1 has an engagement recess 20a with which the protrusion 20 engages. Is formed.

  The protrusion 20 formed integrally with the lower portion of the manual feed tray 15 moves along with the opening and closing of the manual feed tray 15, but in FIG. 2, the manual feed tray is in an opened state and the protrusion 20 is engaged. The engaging mechanism 20 engages with the joint recess 20a and engages with the transmission mechanism 17 provided below the engaged recess 20a.

  The transmission mechanism 17 includes a rack member 21 that is pressed by the protrusion 20 inserted into the engaged recess 20 a, a gear 24 that meshes with a tooth profile formed on the side surface of the rack member 21, and a gear 24. It is comprised from the interlocking member 25 which meshes | engages, and the supporting member 26 which moves by the drive of the interlocking member 25. FIG. The rack member 21 is biased upward by a second elastic body 22 having a lower end fixed to the support portion 23. The support member 26 is provided so as to be movable upward when a lever 25 a provided at one end of the interlocking member 25 abuts on the support member 26, and pushes up the lower end of the paper feed pressure spring 18.

  When the manual feed tray 15 shown in FIG. 2 is opened and the manual feed tray 15 is closed as shown in FIG. 3, the protrusion 20 inserted in the engaged portion 20a is removed from the engaged portion 20a. , Away from the rack member 21 of the transmission mechanism 17. As a result, the rack member 21 is pushed upward in accordance with the urging force of the elastic member 22, and the pushed-up rack member 21 has an upper surface that is larger than the width of the engaged recess 20 a into which the protrusion 20 is inserted. As a result, the lower end of the engaged recess 20a is brought into contact and locked. As the rack member 21 moves upward in this way, the gear 24 meshed with the rack member 21 rotates counterclockwise. Further, when the interlocking member 25 meshed with the gear 24 is rotated, the lever 25a of the interlocking member 25 pushes the support member 26 upward. When the support member 26 moves upward, the lower end of the paper feed pressure spring 18 is pushed up to pressurize the paper feed pressure spring 18. As a result, the urging pressure of the paper P1 placed on the bottom plate 19 increases with the paper feed roller 1c, and the frictional force between the paper feed roller 1c and the paper P1 increases, resulting in an increase in the conveying force.

  As illustrated in FIG. 3, by closing the manual feed tray 15, a sheet insertion opening 33 is formed between the manual feed tray 15 and the image forming apparatus main body R <b> 1. When the sheet P3 is inserted from 33, the sheet P3 can be conveyed with a higher frictional force than when the manual tray 15 is opened and the sheet P1 is conveyed from the manual tray 15.

  In this case, as shown in FIG. 4, the relationship between the paper feed pressure (biasing pressure) Q and the paper handling force F is a straight line L between the paper feeding pressure (biasing pressure) Q and the paper handling force F in this apparatus. As shown, there is a proportional relationship. The paper handling force F is such that the higher the numerical value F is, the more the paper type that is so strong in the sheet can be conveyed. In the present embodiment, the paper feed pressure Q is increased by closing the manual feed tray 15, and the paper handling force Q is increased by ΔF in proportion thereto.

  Further, the shorter the length connecting the rotation fulcrum 16 of the manual feed tray 15, the protruding portion 20, and the contact point of the rack 21 is preferable in driving the transmission mechanism 17 with certainty. This is because the load that the rack member 21 receives from the manual feed tray 15 increases due to the lever principle. Accordingly, the elastic member 22 can set a high pressure condition for the protrusion 20 to be pushed to the end by a load when no paper is placed on the manual feed tray 15. This is because the posture of the manual feed tray 15 is not stable when the upward pressure applied to the elastic member 22 exceeds the load received from the manual feed tray 15.

  The transmission mechanism 17 is not limited to the above-described configuration. For example, the link mechanism is used to connect one end of a lever that rotates around a fulcrum when the rack member 21 moves downward, and the other end of the lever is the support member 26. It is good also as a structure which pushes up. If a multi-stage gear, a bevel gear, or the like is used in the transmission mechanism 17, it is easy to set the reduction ratio, the direction of the action point, and the like, so that space can be used efficiently.

  According to the first embodiment, when the manual tray 15 is opened and the sheet P1 is conveyed from the manual tray 15, and when the sheet P3 is conveyed from the sheet insertion opening 33 while the manual tray 15 is closed, The sheet feeding pressure between the sheet feeding roller 1c and the bottom plate 19 can be changed, and the user can select a different conveying force when performing manual sheet feeding.

  For example, when the manual feed tray 15 is opened and a sheet is manually fed, normal paper is inserted, and when the manual feed tray 15 is closed and a sheet is inserted from the sheet insertion opening 33, a strong cardboard or postcard, Ideal for printing on manufactured sheets.

  Other embodiments will be described below, but portions having the same operational effects as those of the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted. In the description, differences from the first embodiment described above will be mainly described.

  A second embodiment will be described with reference to FIG. In the second embodiment, in the paper feeding unit 1A, the cassette paper feeding unit 42 that feeds the paper P2 of the paper feeding cassette 41, the paper P1 of the manual feed tray 15, and the paper P3 from the sheet insertion opening 33 are fed. The manual paper feed unit 43 is integrally stored in the paper feed unit 29 so that the paper feed unit 29 can be pulled out. The engaged recess 20a is provided in the paper feed unit 29, and is regulated so that the paper feed unit 29 cannot be pulled out when the manual feed tray 15 is opened and the protrusion 20 engages with the engaged recess 20a. is there.

  In the second embodiment, since the cassette paper feeding unit 42 and the manual paper feeding unit 43 are integrally stored in the paper feeding unit 29, the space can be efficiently used, which contributes to a small size. it can. Further, the paper feed tray unit 29 can be pulled out in the direction of arrow E shown in FIG. 5 when the manual feed tray 15 is closed. However, while the manual feed tray 15 is open, that is, manual feed is performed. During this time, the projection 29 is fitted so that the paper feed unit 29 cannot be inserted and removed, and as a result, paper jams during printing can be prevented. That is, when the manual feed tray 15 is open, if the paper feed unit 29 is pulled out during the printing operation of paper feed from the cassette paper feed unit 42 or manual feed, the transport path It is possible to prevent a paper jam that occurs when the paper is cut.

  In order to fulfill the function as a locking member, the number of parts can be reduced if the protrusion 20 is provided integrally with the manual feed tray 15, but if the damage is prevented during operation, the physical properties of higher rigidity can be obtained. It is desirable to form the material and attach it to the manual feed tray.

  The third embodiment will be described with reference to FIG. In the third embodiment, the transmission mechanism 17 in the first embodiment is not provided, and a shielding detection sensor 30 such as a photo interrupter is provided beside the engaged portion recess 20a and engaged with the engaged recess 20a. The control unit 44 drives the solenoid 45 upon receiving the detection signal of the shielding detection sensor 30 and moves the support member 26 upward by driving the solenoid 45.

  In the third embodiment, the first embodiment is configured by pressurizing the bottom plate 19 to the sheet feeding roller 1c using the control unit 44 and the solenoid 45 set on the main body side by turning on and off the shielding detection sensor 30. Compared with this embodiment, the configuration can be simplified, and the amount of force applied can be easily adjusted. Further, when the user operates a control panel in which the control unit 44 is provided in the image forming apparatus, the solenoid 45 is not driven even when the shielding detection sensor 30 detects the projection 20, thereby allowing the user to use the control panel 44. Depending on the mode to be used, it is possible to make a selection range in which the pressurizing force in the sheet feeding roller 1c is not increased, and the degree of freedom of selection can be increased.

  A fourth embodiment will be described with reference to FIG. The fourth embodiment is different from the above-described embodiment in that a flap member 31 that shields the sheet insertion opening 33 is provided at the lower end portion of the manual feed tray 15.

  The flap member 31 is pivotally supported by a rotation fulcrum 32 below the manual feed tray 15. As shown in FIG. 7, when the manual feed tray 15 is in the open state, it is positioned so as to overlap the front portion of the paper feed unit 29, but from the open state of the manual feed tray 17 in FIG. 8, the sheet insertion opening 33 formed between the manual feed tray 15 and the paper feed tray unit 29 is shielded as shown in FIG. 8 so that the internal mechanism becomes invisible, so that the appearance quality when viewed from the front of the apparatus. Can be prevented.

  Furthermore, as shown in FIG. 8, if the torsion coil spring 34 is provided and the flap member 31 is biased to close to the apparatus main body side indicated by the arrow F by the elasticity of the coil spring 34, the posture of the flap member 31 is stabilized. be able to. Even when the flap member 31 is in an open position, the flap member 31 is much smaller than the manual feed tray 15 and can be installed to be opened and closed. This contributes to space saving. In addition, when using the sheet | seat insertion opening part 33, the flap member 31 is opened so that it may rotate upwards from the closed state shown in FIG.

  A fifth embodiment will be described with reference to FIG. In the fifth embodiment, the flap member 31 is configured to be held in a closed state and an open state in the fourth embodiment described above.

  As shown in FIG. 9, a protrusion (locked portion) 35 is formed on the peripheral portion 31 c of the rotation shaft of the flap member 31, and the peripheral portion 31 c of the flap member is the same as the rotation angle of the flap member 31. Rotate by phase. The manual feed tray 15 is provided with a support portion 36 that supports one end portion of a substantially V-shaped leaf spring 37, and a locking member 38 is attached to the other end portion of the leaf spring 37. A recess (locking portion) is formed in the locking member 38, and the projection 35 can be locked to the recess.

  9, the flap member 31 shows a state in which the manual feed tray 15 is closed. As shown by a two-dot chain line, the flap member 31 is opened by rotating by θ2 from the closed state (solid line). The projection 35 is held in the open position as shown by a two-dot chain line by being locked in the recess of the locking member 38.

  Although not shown in FIG. 9, in the fifth embodiment, a torsion coil spring 34 is provided as in the fourth embodiment shown in FIG. 8, and the flap member 31 is biased in the closing direction.

  Since the flap member 31 is subjected to its own weight and a force for closing by the torsion coil spring 34, the leaf spring 37 is set to a pressure higher than the force amount of the two resultant forces.

  Further, during the operation of opening the manual feed tray 15, the flap member 31 hits the contact member 46 and rotates relatively in the opening direction. When the maximum angle of rotation of the flap member 31 is θ1, the condition of θ2> θ1 is satisfied. By satisfying the condition, the flap member 31 is not in the posture shown by the two-dot chain line in FIG. 9 when the manual feed tray 15 is opened and closed, so that the flap member 31 is not unintentionally locked in the open position.

  That is, when the manual feed tray 15 is opened from the closed position shown in FIG. 9, the flap member 31 is held at a position where the sheet insertion opening 33 is closed.

  Further, when the flap member 31 closes the sheet insertion opening 33 as shown by a solid line in FIG. 9 and the user rotates by hand to the open position as shown by a two-dot chain line, the protrusion 35 is engaged. The flap member 31 can be held in the open state by being engaged with the stop member 38.

  In the fifth embodiment, similarly to the third embodiment shown in FIG. 6, when the opening / closing of the manual feed tray 15 is detected by the shielding detection sensor 30 that detects the open / close of the manual feed tray 15, a motor, a solenoid, etc. The flap member 31 may be rotated to the open / close position by a drive source. In this case, the operability is improved because the user does not need to perform the opening and closing operation.

  A sixth embodiment will be described with reference to FIGS. 10 and 11. In the sixth embodiment, the sheet P3 to be inserted from the sheet insertion opening 33 is guided. In FIG. 10, a pair of paper regulation guides 40a and 40b are attached to the lower surface of the flap member 31 when it is opened.

  When the sheet insertion opening 33 is used as a one-sheet manual feed opening, the image position accuracy is increased if the sheet restriction guides 40a and 40b are used, so that the print quality is improved. Further, it is desirable that the sheet regulation guides 40a and 40b can be freely adjusted in the sheet width direction by a rack and a pinion.

  In the sixth embodiment, as shown in the front view of FIG. 11, when the manual feed tray 15 is in the closed state and the flap member 31 is in the open state, the sheet insertion opening 33 is formed. It is possible to set paper from.

  A seventh embodiment will be described with reference to FIG. In the seventh embodiment, the width of the sheet insertion opening 33 is made constant in the above-described sixth embodiment. That is, unlike the regulation guides 40a and 40b of the sixth embodiment, the regulation guide 40c attached to the lower surface of the flap member 13 is a square hole having a square shape in front view, and this square hole is inserted into the sheet. To guide you. Therefore, since the width direction is fixed, only sheets of a predetermined size can be set. However, since the fixed regulation guide 40c does not move, the user operation is more varied than the regulation guides 40a and 40b of the type that slides in the width direction. Therefore, the image position accuracy is further improved.

  Furthermore, by setting the regulation guide 40c as a square hole, a plurality of sheets can be set due to the presence of the lower surface of the square hole. In this embodiment, the postage postcard used as a standard size is strong, and is most suitable for printing new year postcards.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. For example, in the first embodiment, the sheet detection sensor 48 shown in FIG. 2 is normally used for detecting the presence / absence of a sheet in the sheet feeding of the manual tray 15, but the user performs a sheet feeding operation from the sheet insertion opening 33. When the paper detection sensor 41 is turned on, the driving force may be transmitted to the paper feed roller 1c by a clutch or the like after a preset time and the paper conveyance may be started. With this control, the user sets a sheet after setting the sheet on the manual feed tray 15, and the user sets a sheet instead of an operation such as supplying a sheet while the sheet feeding roller 1c is rotating after issuing a print command. After that, an automatic feeding operation is automatically performed after an optimum set time, so that the effect of the operational tendency can be obtained.

R Image forming apparatus R1 Image forming apparatus main body 1C Manual paper feeder 15 Manual tray 16 Rotating fulcrum 17 Transmission mechanism (biasing force changing means)
18 Feeding pressure spring (elastic member)
19 Bottom plate 20 Protruding part (engaging convex part)
20a Engagement part (engaged recess)
21 Rack member 24 Gear (gear)
26 Support member 29 Paper feed unit 31 Flap member 33 Sheet insertion opening 35 Projection (locked portion)
38 Locking member

Japanese Patent No. 2632453 JP 2008-37549 A

Claims (9)

  A manual feed tray that is openable and closable on the horizontal axis of the image forming apparatus main body, a paper feed roller that feeds paper placed on the manual feed tray to the image forming apparatus main body, Detecting that the provided bottom plate, urging means for urging the bottom plate toward the paper feed roller, urging force changing means for changing the urging force of the urging means, and the manual feed tray 7 are in the open position or the closed position Tray opening / closing detection means and a sheet insertion opening for inserting a sheet from the lower end of the manual feed tray between the paper feed roller and the bottom plate when the manual feed tray 7 is in the closed position. A manual sheet feeding device, wherein when the opening / closing is detected, the urging force changing means changes the urging force for urging the bottom plate toward the sheet feeding roller.   The manual feed tray 7 has an engaging convex portion, the tray open / close detection means has an engaged concave portion that engages with the engaging convex portion of the manual tray 7, and the biasing means has one end connected to the bottom plate and the other end movable. A spring fixed to the holding member, and the biasing force changing means includes a rack that is pushed and moved by the engaging convex portion that is inserted into the engaged concave portion, and a gear that meshes with the rack. The manual sheet feeding device according to claim 1, wherein the urging force of the bottom plate with respect to the sheet feeding roller is changed by moving the holding member.   Provided in the image forming apparatus main body and provided with a paper feeding unit for feeding paper from the paper feeding cassette, the paper feeding unit is detachable from the main body of the image forming apparatus, and the engaged recess is provided in the paper feeding unit. 3. The manual feed according to claim 2, wherein when the manual feed tray is in the open position, the engaging convex portion of the manual feed tray engages with the paper feed unit to restrict the insertion / extraction movement of the paper feed unit. Paper device.   The manual feed tray includes a flap member pivotally supported at a lower end portion thereof, and the flap member shields the sheet insertion opening when the manual feed tray is in a closed position. The manual sheet feeding device according to any one of the above.   The flap member is always urged in the direction of closing the sheet insertion opening, the flap member has a locked portion around the rotation fulcrum, and the manual feed tray is locked to the locked portion of the flap member. The locking member of the manual feed tray is biased toward the rotation fulcrum of the flap member by the elastic member, and the locked portion of the flap member is locked at the position where the flap member opens the opening. When the rotation angle θ1 when the manual feed tray is in the closed position from the open position and the angle θ2 between the closed position and the open position of the flap member, θ2> θ1 is satisfied. The manual sheet feeding device according to claim 4.   5. The manual sheet feeder according to claim 4, further comprising a flap control mechanism that opens the flap member when the manual tray is closed.   The flap member includes a regulating member that regulates a position in a width direction of a sheet to be inserted into the sheet insertion opening when the flap member is rotated to open the sheet insertion opening. The manual sheet feeding device according to any one of claims 4 to 6.   The flap member has a sheet insertion opening into which the sheet can be inserted with the sheet insertion opening closed, and allows the sheet to be manually inserted from the sheet insertion opening when the sheet insertion opening is in the closed position. The manual sheet feeding device according to any one of claims 4 to 6, wherein   An image forming apparatus comprising the manual sheet feeding device according to claim 1.

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