JP2007112536A - Paper feeding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent contact of a guide member with paper carrying rollers when the guide member is moved in accordance with a paper size, in a paper feeding mechanism movable in accordance with the paper size, having the guide member for guiding either one of paper lateral end parts and the plurality of paper carrying rollers positioned in a straight direction with respect to a paper carrying direction, and setting the lateral end part in the reverse side of the lateral end part guided by the guide member as a position reference in the straight direction with respect to the paper carrying direction. <P>SOLUTION: The paper carrying rollers positioned within a movable range of the guide member are movable in accordance with the movement of the guide member via a link mechanism, and the paper carrying rollers located in the positions where they contact the guide member are moved to positions to prevent the contact with the guide. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a paper feeding device used in a recording device such as an ink jet printer, a copying machine, or a facsimile.

  2. Description of the Related Art Conventionally, recording apparatuses such as printers, copiers, and facsimiles are provided with a paper feeding device that supplies paper to a normal image recording unit. As such a sheet feeding device, for example, a slope member is provided at the downstream end of the sheet stacking direction of the sheet stacking unit, and one sheet is brought into contact with the sheet fed by the sheet feeding unit by the slope member. There is a structure that separates each one.

  2 and 3 show a schematic configuration of a conventional paper feeding apparatus 200 using a method of separating sheets by such a slope member. 2 and 3, reference numeral 201 denotes a paper cassette main body, 202 is a separation plate, 203 is paper, 204 cassette lid, 205 is a swing arm, 206 is paper feed gear, 207 is belt, 208 paper feed pulley, 209 Is a paper feed roller. As shown in FIG. 2, sheets 203 are stacked on the sheet feeding cassette 201, and a swing arm 205 is positioned above the sheets 203. Further, the sheet 203 is covered with a cassette lid 204 so that foreign matter does not adhere to the sheet 203 on the sheet feeding cassette 201. As shown in FIG. 3, the swing arm 205 holds a paper feed roller 209 connected to the paper feed gear 206, belt 207, paper feed pulley 208 and the like via a shaft and a gear. When the paper feed gear is rotated by a drive mechanism (not shown), the paper feed roller 209 is rotated to convey the paper 203 in the direction of the arrow in FIG. The conveyed sheet 203 is pressed against a separation plate 202 provided on the downstream side in the sheet conveying direction. At this time, due to the frictional force relationship between the separation plate 202 and the sheet 203, the sheets 203 are separated one by one, and only the uppermost sheet 203 is conveyed to an image recording unit (not shown). At this time, in order to avoid the problem of skewing of the paper at the time of paper feeding, a plurality of paper feed rollers are provided in a direction orthogonal to the paper transport direction (hereinafter referred to as paper width direction) to suppress variation in paper transport force in the paper width direction. In addition, it is effective to guide the movement of the paper by arranging the side guides located at the lateral edge of the paper as far as possible to the front of the paper.

  By the way, the paper feeding apparatus as described above is often required to deal with papers of various sizes. At this time, on the paper feeding device side, there are a method for dealing with various paper sizes based on the paper center in the paper width direction and a method for dealing with one of the paper lateral edges in the paper width direction as a reference. A schematic of each method is shown in FIGS. Numbers 201 to 209 in the figure are the same as those in FIGS. 2 and 3, 210a and 210b are side guides, and 211 is a rear end guide. As shown in FIG. 4, in the method using the center of the sheet as a reference, the side guides 210a and 210b at both ends and the rear end guide 211 are moved in the direction of the arrow in the drawing according to the sheet size. As shown in FIG. 5, in the method based on either one of the lateral edges of the sheet, the right end of the sheet is abutted against the lateral wall surface 201a of the cassette, and the side guide 210a and the rear end guide 211 located on the left end surface side are shown in the drawing. Move in the direction of the arrow. Although the right end portion is used as a reference in FIG. 5, the left end portion may be used as a reference. However, conventionally, of the two methods described above, the method based on the center of the sheet is often used for the following reason from the viewpoint of preventing the skew feeding described above.

  1. By disposing the paper feed roller at a position symmetric with respect to the reference at the center of the paper, it is possible to suppress the variation in the paper conveyance force in the paper width direction relatively easily and to prevent skewing.

  2. By arranging the paper feed rollers so that all of the paper feed rollers are in contact with the paper for the minimum supported paper size, even if the side guides are moved, the paper feed rollers and the side guides come into contact with the roller surface. It will not hurt.

For example, Patent Document 1 and Patent Document 2 can be cited as conventional examples.
JP-A-9-212248 JP 2004-130612 A

  However, the method based on the center of the paper has the following two problems compared to the method based on the lateral edge of the paper.

  The first is that when the side guides are moved in accordance with the paper size, the side guides at both lateral ends must be interlocked, and the mechanism of the paper feed cassette becomes complicated. That is, the user's operability is better when the side guide on the opposite side is moved in the same way when one side guide is moved. However, in order to realize this, it is necessary to provide a link mechanism for both side guides, which causes problems such as a complicated mechanism for the paper feed cassette and an increase in the number of parts. On the other hand, the method based on the side edge of the paper is mechanically easy because only the side guide located at the end opposite to the reference side needs to be moved.

  The second problem occurs when the paper feed mechanism of the ink jet printer employs a method based on the center of the paper. This will be described below with reference to FIGS.

  6 and 7 schematically show a printing operation in the ink jet printer. FIG. 6 shows a case where the center of the paper is used as a reference, FIG. 7 shows a case where the horizontal edge of the paper is used as a reference, and 301 shows LF roller 302 is a head recovery means, 303a is a maximum size paper, 303b is a minimum size paper, 304 is a paper size reference position, and 305 recording head. In a printing operation in an inkjet printer, an image is generated by ejecting ink onto a sheet while the recording head 305 moves in the direction of the arrow in the drawing according to the movement of the sheet in the direction of the arrow in the drawing by the rotation of the LF roller 301. Is formed. Such an ink-jet printer usually has a head recovery means 302 for performing head recovery operations such as capping, suction, wiping, and preliminary ejection of the recording head and preventing clogging of the recording head and maintaining the head performance. Exists. The head recovery means 302 is disposed in the vicinity of one end of the moving range of the recording head moving range that is equal to or larger than the maximum paper width of the corresponding size in the same direction as the paper width direction. 6 and 7, it exists in the vicinity of the right end of the moving range. Furthermore, the various head recovery operations described above include operations that are performed during the recording operation for each line in addition to during standby and before and after the recording operation.

  Therefore, when the center of the sheet is used as a reference, when printing is performed on the minimum size sheet 303a indicated by the hatched portion in FIG. 6, the recording head 305 needs to move by A in the figure for the head recovery operation. In the case where the end portion is used as a reference, if the sheet horizontal end portion on the head recovery means 302 side is used as a reference as shown in FIG. . As described above, in the case of the paper center reference, the throughput is reduced by the difference in the recording head movement amount during the head recovery operation with respect to the paper lateral edge reference.

  However, the method based on the lateral edge of the paper has a problem of skew during feeding. That is, in order to avoid skewing during paper feeding, as described above, a plurality of paper feed rollers are provided in a direction orthogonal to the paper conveyance direction, and variation in the direction perpendicular to the paper conveyance direction of the paper conveyance force is suppressed, It is effective to arrange the side guides located at the lateral edge of the paper as far as possible to the front of the paper to guide the movement of the paper. In realizing this configuration, the method based on the center of the cassette can be easily handled as shown in FIG. 4, but the method based on the lateral edge of the paper can be used with a side guide as shown in FIG. If the sheet is moved to accommodate a large size sheet, the following relationship may occur due to the positional relationship in which the sheet feeding roller interferes.

  1. If the cassette is mounted on the main body in a state where the side guide is placed at an inappropriate position by the user, the side guide and the paper feed roller may come into contact with each other, which may damage the roller.

  2. When the user moves the side guide in order to set paper with the cassette mounted on the main body, the same problem occurs as the paper feed roller and the side guide come into contact with each other as described above.

  In view of the above circumstances, the present invention realizes the simplification of the cassette structure and the correspondence to the ink jet printer by using the method based on the lateral edge of the paper, and the skew feeding at the time of feeding without causing the above-mentioned problems. It aims at realizing the structure for preventing.

In order to solve the above problems,
(1) A plurality of paper feed rollers are arranged in a direction orthogonal to the paper transport direction.
(2) In the paper feed mechanism based on the lateral edge of the paper, the paper feed roller disposed outside the minimum paper size corresponding to the reference can move in a substantially vertical direction with respect to the paper. To do.
(3) When the paper feed cassette is set in the main body, the paper feed roller located outside the side guide with respect to the reference is located above the stacked paper according to the movement of the paper feed cassette set by the link mechanism. Move to.
(4) When the side guide is moved inside the set cassette, the paper feed roller moves upward with respect to the stacked paper in the same manner as in (3) in conjunction with the side guide.

  With such a configuration, the contact between the side guide and the paper feed roller can be avoided.

As described above, according to the present invention,
(1) By using the sheet lateral edge as a reference in sheet feeding mechanisms corresponding to various sizes, it is possible to simplify the structure of the sheet feeding cassette and prevent a decrease in throughput in an inkjet printer.
(2) By providing a plurality of paper feed rollers in the paper width direction and further arranging the side guides to the vicinity of the leading edge of the paper, skew feeding during paper feeding can be prevented.

  The effect can be realized.

  Hereinafter, an ink jet printer using the paper feed mechanism according to the present invention will be described in detail. FIG. 8 is a layout diagram of the ink jet printer according to the present invention. The ink jet printer 1 includes a paper feeding device 100, an exterior cover 2, an outer guide 3a, an inner guide 3b, a registration roller pair 4, a print head 5, a platen 6, a paper discharge roller pair 7, a paper discharge tray 8, and the like. The

  The paper feeding device 100 includes a paper feeding cassette 110 that is a paper stacking means for stacking paper, a swing arm 120 that is a paper supply means, and a separating means that separates only the uppermost paper when a plurality of paper is conveyed. And a motor and gear train (not shown) for driving the swing arm 120, the registration roller pair 4, the paper discharge roller pair 7, and the like. Further, the paper feed cassette 110 is detachable from the paper feed device 100, and is configured to be set in the paper feed mechanism 100 after the sheets are stacked by the user.

  The exterior cover 2 is formed so as to cover the entire inkjet printer 1 including the paper feeding device 100. The outer guide 3a is a guide member when the sheet conveyed from the sheet feeding device 100 is conveyed to the next process. In the case of the present embodiment, the conveyed paper is so-called U-turned and conveyed to the print head 5 which is an image forming unit, but the outer conveyance path through which the paper passes is regulated in the U-turn, and the next process Guide you smoothly. The inner guide 3b, like the outer guide 3a, regulates the inner conveyance path through which the paper passes during the U-turn and smoothly guides to the next process.

  The registration roller pair 4 includes a driving side LF roller 4a and a driven side pinch roller 4b. The LF roller 4a is driven to convey a required amount of paper by a motor and gear train (not shown). The pinch roller 4b is biased toward the LF roller 4a by a biasing means (not shown). By nipping and conveying the sheet to the nip of the registration roller pair 4, the sheet can be conveyed in the direction of the print head 5 which is an image forming unit. The registration roller pair 4 during image formation is intermittently conveyed by a predetermined amount by the motor (not shown) described above.

  Further, the registration roller pair 4 corrects the skew of the sheet by abutting the leading end of the sheet conveyed from the upstream side by the conveyance from the sheet feeding device 100 to the nip in the stopped state. In addition, after skew correction by abutment, the sheet is conveyed with an accurate feed amount by intermittent driving during image formation by the print head 5. Since the feed amount during intermittent conveyance of paper by the registration roller pair 4 has a great influence on the quality of the image, the registration roller pair 4 usually has a large conveyance force in the conveyance means of the ink jet printer. Accurate drive control is performed.

  The print head 5 is configured to form an image by ejecting ink droplets from a surface facing the print surface of the paper while reciprocating in the direction orthogonal to the conveyance direction, that is, the paper width direction, by a carriage (not shown). The print head 5 is also configured so that ink of a necessary color and amount is appropriately supplied by an ink supply means (not shown).

  The platen 6 is configured to appropriately maintain the flatness of the printing surface of the paper, the clearance with the print head 5, and the parallelism when an image is printed by the print head 5. The reason why the positional relationship between the print head 5 and the sheet needs to be maintained in this way is to increase the landing position accuracy of the ink droplets ejected from the print head 5.

  It is further preferable that a sheet suction unit (not shown) is separately provided and the sheet is brought into close contact with the platen 6 by sucking the sheet onto the conveying surface of the platen 6 so as to maintain the above-described flatness, clearance, and parallelism. It becomes.

  The paper discharge roller pair 7 includes a drive-side paper discharge roller 7a and a driven-side spur 7b. The paper is sandwiched and conveyed by a motor (not shown) with a conveyance force weaker than that of the registration roller pair 4 described above. It is configured. The paper discharge roller 7a is formed of a high friction member such as rubber, for example, contacts the non-printing surface of the image-formed paper, and conveys the paper to the paper discharge tray 8 described later by the action of the spur 7b. Since the spur 7b must be brought into direct contact with the printing surface of the sheet immediately after printing, it is necessary to reduce the contact area as much as possible. Therefore, in this embodiment, the spur 7b has a shape in which a large number of needle-like protrusions are formed on the outer peripheral portion thereof.

  The paper discharge tray 8 is configured so that a predetermined amount of printed paper discharged from the paper discharge roller pair 7 can be stacked.

  Next, the mechanism and operation of the sheet feeding device 100 in this embodiment will be described in more detail.

  FIG. 9 is a detailed view of the paper feed cassette 110. The sheet cassette 110 includes a cassette body 111, a rear end guide 112, a side guide 113, a sheet 114, and a separation plate 130. In the present embodiment, when dealing with various paper sizes, a method based on either one of the side edges of the paper is adopted, that is, the paper 114 loaded on the paper feed cassette 110 is not in the cassette main body 111. The cassette body wall surface 111a is used as a reference surface, one lateral end of the paper 114 is abutted, the rear end is regulated by the rear end guide 112, and the lateral end surface opposite to the reference side is regulated by the side guide 113. Is done. At this time, the side guide 113 guides the vicinity of the leading end of the sheet 114 in order to suppress the occurrence of skew during conveyance of the sheet 114. Further, when stacking a sheet having a different size from the sheet 114 in the figure, the rear end guide 112 and the side guide 113 are moved in the directions of the arrows along the grooves 111b to 111c of the cassette body 111, respectively. It has become. Here, the sheet 114 in FIG. 9 represents the minimum size sheet 114, and when using a sheet 114 having a larger size, the side guide is moved toward the left side in the figure with respect to the sheet 114. The separation plate 130 separates the paper 114 conveyed by a paper feed roller held by a swing arm, which will be described later, one by one due to the frictional force relationship with the paper 114. In this embodiment, a plurality of separation plates 130 are provided to cope with various paper sizes. In this embodiment, the separation plate 130 is attached to the cassette body 110, but the present invention is not necessarily limited thereto.

  Next, a detailed view of the swing arm 120 in the present embodiment is shown in FIG. The swing arm 120 serving as a paper supply means includes a swing arm stay 121, paper feed rollers 122a to 122c, paper feed gear 123, belt 124, paper feed pulley 125, paper feed roller holder 126, paper feed roller drive shaft 127, paper feed roller. The paper roller drive gears 128a to 128c are used. In the present embodiment, the swing arm 120 holds a plurality of paper feed rollers 122a to 122c in the paper width direction in order to deal with various sizes of paper 114, and the variation in the conveyance force in the paper width direction is reduced to make it slant. The occurrence of lines is suppressed. Further, among the plurality of paper feed rollers 122a to 122c, the paper feed roller 122c held by the paper feed roller holder 126 is configured to rotate up and down around the paper feed shaft 127 as shown in FIG. ing. The symbols in FIG. 11 are the same as those in FIG. However, it is normally positioned coaxially with the paper feed rollers 122a and b by a mechanism (not shown). Hereinafter, the operation of the swing arm 120 will be described in detail.

  The basic operation of the swing arm 120 will be described below using the arrow view from the lateral direction of the swing arm 120 shown in FIG. Symbols in FIG. 12 are the same as those in FIGS. 10 and 11, 10 is a drive gear, a1 is the rotation center of the swing arm stay 121, a2 is the rotation center of the feed roller, and S1 is the uppermost sheet.

  The swing arm stay 121 is a pendulum-like member that is supported by a frame (not shown) so as to be swingable at a rotation center a1, and supports paper feed rollers 122a to 122c at the tip of the pendulum so as to be rotatable. More specifically, the rotation center a1 of the swing arm stay 121 is rotatably supported by the above-described frame (not shown) above the rotation center a2 of paper feed rollers 122a to 122c described later and upstream in the paper feed direction. .

  The paper feed rollers 122a to 122c are supported at the rotation tip of the swing arm stay 121 at the rotation center a2, and the surface thereof is cylindrical and has a high coefficient of friction. The paper feed rollers 122a to 122c are configured to always follow and contact the uppermost sheet S1 of the sheet S by swinging of the swing arm stay 121. Further, a gear portion is formed integrally with the feed rollers 122a to 122c coaxially with the rotation center a2, and the feed roller driving shaft 127 and the feed roller are fed from a gear portion formed integrally with a later-described feed pulley 125. The paper feed rollers 122a to 122c are rotationally driven through the paper roller drive gears 128a to 128c, and convey the paper S1 on the uppermost surface of the paper 114 held in the cassette 110 in the downstream direction.

  The paper feed gear 123 is supported so as to be rotatable coaxially with the rotation center a <b> 1 of the swing arm stay 121. When the paper feed gear 123 is rotationally driven by a final drive gear 10 driven by a motor (not shown), a belt 124 described later is provided by a pulley portion 123 a of the paper feed gear 123 formed integrally with the paper feed gear 123. It is comprised so that it may drive.

  The belt 124 is connected to a pulley portion 123a formed integrally with the paper feed gear 123 described above and a paper feed pulley 125 described later. The gear unit formed integrally with the paper feed roller 122 is driven.

  The paper feed pulley 125 is connected to the pulley portion 123a of the paper feed gear 123 by the belt 124 described above, and as described above, the paper feed roller 122a is formed by the gear portion integrally formed coaxially with the paper feed pulley 125. Drive the gear part of c. With these configurations, the paper feed roller 122 is driven in the paper feed direction by the drive gear 10.

With the above-described configuration, the swing arm stay 120 swings in the B direction by its own weight and / or friction torque associated with driving described later, and follows the uppermost sheet S ₁ of the stacked sheets S to supply it. The paper roller 122 is configured to apply a load in the direction of the paper feeding pressure N with respect to the uppermost paper S ₁ . When the drive gear 10 rotates in the CCW direction in FIG. 2, the swing arm stay 120 swings in the B direction due to friction torque or the like derived from the drive mechanism in the swing arm stay 120, and It is configured to apply a load in the paper feed pressure N direction by biting into the paper S ₁ . If the sheet feeding roller 122 rotates in the sheet feeding direction due to these, the sheet feeding pressure N increases and the sheet feeding force _Fp is generated. Here, if the friction coefficient between the surface of the sheet feeding roller and the sheet S is the friction coefficient μ ₁ , the sheet feeding force F _p is expressed as follows.

F _p = μ ₁ × N
Thus the swing arm 120 provides a feeding force F _p on the sheet S ₁ of the top surface of the loading the paper S, to convey the sheet S ₁ in the feeding direction A.

  In the paper feed mechanism 100 in this embodiment, as described above, the user loads the paper 114 on the paper feed cassette 110, aligns the rear end guide 112 and the side guide 113 with the paper end, and then swings the paper feed cassette 110. A configuration in which the ink-jet printer 1 including the paper feed mechanism 100 having the printhead 120 is set. In the sheet feeding device 100 having such a configuration, as described above, the swing arm 113 is disposed near the leading end of the sheet 114 to prevent skew feeding while the sheet lateral edge portion is used as the sheet size reference in the sheet feeding cassette. If the arm 120 is also provided with a plurality of paper feed rollers 122a to 122c in the paper width direction to prevent skew feeding, there is a positional relationship in which the side guide 113 of the paper feed cassette 110 and the paper feed rollers 122a to 122c overlap. FIG. 13 shows the state. Symbols relating to the paper feed cassette 110 and the swing arm 120 in FIG. 13 are the same as those in FIG. 9 and FIG. In this embodiment, since the paper 114 in the drawing is the minimum size, the side guide 113 is configured not to reach the inside of the paper 114, and only the paper feed roller 122c is in the positional relationship where the side guide 113 overlaps as described above. become. In this case, the following problems may occur.

  That is, when the user sets the paper 114 in the paper feed cassette 110, the side guide 113 is not positioned on the lateral edge of the paper 114, and the side guide 113 is in a position overlapping the paper feed roller 122c of the swing arm 120. If an attempt is made to set the cassette 110 to the paper feed mechanism 100 with this, the tip of the swing arm 113 and the paper feed roller 122c come into contact with each other, and the surface of the paper feed roller 122c and the tip of the side guide 113 are damaged. Depending on the user, it is also conceivable to set paper 114 having a different size in the paper feed cassette 110 while the paper feed cassette 110 is set in the paper feed mechanism 100. Also in this case, there is a possibility that the side guide 113 and the paper feed roller 122c come into contact with each other as described above.

  In the present embodiment, the above problem does not occur and will be described in detail below.

  First, the operation of the paper feeding cassette 110 and the swing arm 120 in the paper feeding mechanism 100 when the user sets the paper feeding cassette 110 in the paper feeding mechanism 100 will be described with reference to FIGS. In the drawing, the symbols for the paper feed cassette 110 and the swing arm 120 are the same as those in FIGS. 9 and 10, and 111d is a cassette body cam shape.

  As the paper feed cassette 110 is inserted into the paper feed mechanism 100, the swing arm 120 is lifted upward by a cam shape 111d provided on the end surface of the cassette body 111 as shown in FIG. At this time, since the paper feed roller 122c is higher than the side guide 113, the front end of the side guide 113 is fed when the cassette 110 is set, regardless of the position of the side guide 113 on the cassette body 111 set by the user. While passing through the bottom surface of the roller 122c, the paper feed roller 122c and the tip of the side guide 113 do not interfere with each other. Further, as shown in FIG. 1, at the same time when the cassette 110 is inserted into the paper feeding mechanism 100 and reaches the normal position, the swing arm is driven by the cam shape 111d on the end surface of the cassette body 111, so that the paper feeding rollers 122a to 122c Go down to the position where it touches. At this time, as shown in FIG. 15, when the paper feed roller 122c is in a position where it overlaps with the side guide 113, the tip of the paper feed roller holder 126 holding the paper feed roller 122c comes into contact with the side guide 113 and feeds. The paper roller holder 126 and the paper feed roller 125c are pushed upward. For this reason, the paper feed roller 125c and the side guide 113 do not contact each other.

  Next, a case where the user moves the side guide 113 while the paper feeding cassette 110 is mounted on the paper feeding device 100 will be described with reference to FIGS. Symbols in the figure are the same as those in FIGS. 9 and 10, 113a is a side guide claw, and 126a is a guide rail.

  When the user moves the side guide 113 in the paper feed cassette 110 toward the paper feed roller 125c, the side guide claw 113a of the side guide 113 and the guide rail 126a of the paper feed roller holder 126 are moved as shown in FIG. In order to make contact, the paper feed roller holder 126 rotates in the direction of the arrow in FIG. 16, and the paper feed roller 122c moves upward. Then, immediately before reaching the position where the paper feed roller 122c and the side guide 113 overlap, the paper feed roller 122c moves up to a position where it does not contact the side guide 113 as shown in FIG. For this reason, the side guide 113 and the paper feed roller 122c do not interfere with each other.

  In the paper feeding device 100 having the above-described configuration, the side edge of the paper is removed without causing the problem of the scratch on the surface of the paper feeding roller 122c due to the contact between the side guide 113 and the paper feeding roller 122c or the breakage of the tip of the side guide 113. Using the standard method, the cassette structure can be simplified and the ink jet printer can be supported, and the skew of the paper can be prevented.

FIG. Schematic diagram of conventional paper feeder Schematic diagram of the swing arm inside a conventional paper feeder Example of using the paper center as the reference in the paper width direction when handling paper of various sizes in the paper feeder Example of using the horizontal edge of the paper as a reference in the paper width direction when handling paper of various sizes in the paper feeder Schematic diagram when using a paper feed device with the center of the paper as the reference in the paper width direction in an inkjet printer Schematic diagram when using a paper feeding device with the horizontal edge of the paper as the reference in the paper width direction in an inkjet printer Schematic diagram of an ink jet printer using a paper feeding device according to the present invention. Detailed view of the paper cassette of the paper feeder according to the present invention Detailed view of swing arm of sheet feeding device according to the present invention Detailed view when the paper feed roller in the swing arm rotates Explanatory drawing at the time of swing arm operation Detail view of the side guide placed by the user at a position where it interferes with the paper feed roller Detailed view of swing arm operation when paper cassette is set in paper feeder Detailed view of link mechanism between side guide and paper feed roller holder Detail view when the user moves the side guide with the paper cassette set in the paper feeder Detailed view of link mechanism of side guide and paper feed roller holder by side guide claw and guide rail

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inkjet printer 2 Exterior cover 3a Outer guide 3b Inner guide 4 Registration roller pair 5 Print head 6 Platen 7 Paper discharge roller pair 8 Paper discharge tray 10 Drive gear 100 Paper feed device 110 Paper feed cassette 111 Cassette body 111a Paper reference surface 111b Rear End guide groove 111c Side guide groove 111d Cam shape 112 Rear end guide 113 Side guide 113a Side guide claw 114 Paper 120 Swing arm 121 Swing arm stay 122a-c Paper feed roller 123 Paper feed gear 124 Belt 125 Paper feed pulley 126 Feed Paper roller holder 126a Guide rail 127 Feed roller driving shaft,
128a-c Paper feed roller drive gear 130 Separating plate

Claims (3)

In a paper feeding device that takes out only one sheet from the top surface of the loaded paper and feeds it to the next process,
A paper stacking means for stacking removable paper on the apparatus body;
Guide means for guiding the edge of the paper disposed inside the paper stacking means;
A paper transporting means for transporting the paper to the next process in contact with the top surface of the loaded paper;
A plurality of paper feeding means disposed at least on the paper transport means;
Separating means for separating the paper conveyed by the paper conveying means into only the uppermost paper;
With
At least one of the plurality of paper feeding units moves in a substantially vertical direction from the paper surface independently of the other paper feeding units.   In the paper feeding device, at least one of the plurality of paper feeding means moves in a substantially vertical direction from the paper surface independently of the other paper feeding means in synchronism with the attaching / detaching operation of the paper stacking means to the main body. The sheet feeding device according to claim 1.   In the sheet feeding device, when the sheet stacking unit is mounted on the main body, at least one of the plurality of sheet feeding units is synchronized with the movement of the guide unit disposed inside the sheet stacking unit. 3. The paper feeding device according to claim 1, wherein the paper feeding device moves in a substantially vertical direction from the paper surface independently of the paper means.

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