JPH1059556A - Paper supply device and printing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To regulate the maximum amount of paper which is piled up on a paper supply base to obtain secure paper supply operation and simplify a structure for the regulation. SOLUTION: When an open and close cover 16 is turned around a shaft part 23 and is opened, a paper supply base 12 is pushed by a tip 20 of an arm 18 and leaves a paper supply roller 25. A regulation part 23 formed as a difference in steps between a first arm part 19 and a second arm part 21 in the arm 18 regulates the maximum amount of paper which is piled up on the paper supply base 12. When the open and close cover 16 is closed, the arm 18 and the regulation part 23 leave the paper supply base 12 and paper P so that the paper supply operation by the paper supply roller 25 becomes possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeding device for feeding a plurality of sheets stacked on a paper feeding table one by one by a paper feeding roller, and a printing apparatus provided with the paper feeding device. The present invention relates to an apparatus in which a maximum amount of sheets stacked on a sheet feeder can be regulated with an opening / closing cover covering an upper part of a paper stand being opened.

[0002]

2. Description of the Related Art Conventionally, as a paper feeder mounted on various printing devices such as an ink jet type printer and feeding a plurality of sheets stacked on a paper feeder one by one, a paper on the paper feeder is used. Paper feed roller that feeds the paper one sheet at a time, biasing means that urges the paper feed table to the paper feed roller side, an open / close cover that can open and close the upper part of the paper feed table, A pair of arms for pushing both ends to move the sheet feeding table away from the sheet feeding roller against the urging force of the urging means; an open / close cover rotatably provided coaxially with the sheet feeding roller; Is known in which the distance between the paper and the paper feed roller is maintained at a predetermined distance in a closed state.

In this type of sheet feeding device, when the opening / closing cover is opened, a pair of arms pushes both ends of the sheet feeding table in the sheet width direction, and the sheet feeding table is pressed by the urging force of the urging means. The sheet is moved away from the sheet feed roller to increase the distance between the sheet supply table and the color, and the sheet can be set on the sheet supply table. When the opening / closing cover is closed, the paper feed tray urged by the urging means moves to the paper feed roller side, the color contacts the paper on the paper feed tray, and the gap between the paper and the paper feed roller is reduced. The sheet is held at a predetermined interval, and in this state, when the sheet feeding roller rotates, a plurality of sheets stacked on the sheet feeding table are fed one by one.

[0004]

Generally, in the paper feeding device, the maximum amount of paper stacked on the paper feeding table is determined. Since the distance between the paper feed table moved to and the color is widened, it is possible to easily set sheets of the maximum amount or more on the paper feed table. When a sheet of paper larger than the maximum amount is set in this way, the reaction force of the urging means for urging the paper feed table becomes large, and the paper hits the paper feed roller with a pressure equal to or more than the design value, or the paper and the separating means are separated. There is a problem that a reliable paper feeding operation cannot be obtained, for example, a positional relationship changes, and paper is double-fed.

[0005] Conventionally, a device provided with a separate regulating member for regulating the maximum amount of sheets stacked on the sheet feeder at a position spaced a predetermined distance from the sheet feeder is provided on a sheet feeder or an opening / closing cover. However, since the regulating member is separately provided, the structure becomes complicated and the manufacturing cost increases. Although it is conceivable to make the regulating member protrude from the side of the sheet feeding table, the width of the sheet feeding device increases. In addition, when the maximum amount of paper is set, the paper near the height of the maximum amount comes into contact with the regulating member, causing resistance during paper feeding, which is not preferable. SUMMARY OF THE INVENTION It is an object of the present invention to control the maximum amount of sheets stacked on a sheet feeder in a paper feeder and a printing apparatus including the paper feeder, to ensure a reliable paper feed operation, And simplification of the structure that regulates the maximum amount of sheets stacked on the paper table.

[0006]

According to the present invention, there is provided a paper feeder comprising:
A plurality of sheets stacked on the paper feed table
In a sheet feeding device for feeding sheets one by one, an urging means for urging the sheet feeding table toward the sheet feeding roller, an opening / closing cover for opening and closing the upper part of the sheet feeding table, and an opening / closing cover provided on the opening / closing cover. A pair of arms for pushing both ends in the sheet width direction of the sheet feeder at the time of opening to move the sheet feeder to the side away from the sheet feeding roller against the urging force of the urging means; Is characterized in that it has a restricting portion for restricting the maximum amount of sheets stacked on the paper feed tray to a position separated by a predetermined distance from the paper feed tray when the opening / closing cover is opened.

When the opening / closing cover is opened, the pair of arms pushes both ends in the sheet width direction of the sheet feeding table, and the sheet feeding table moves away from the sheet feeding roller against the urging force of the urging means. As the paper tray moves, the paper can be set on the paper tray, and when the cover is closed, the paper tray urged by the urging means moves to the paper feed roller side and the paper feed roller When is rotated, the sheets on the sheet feed table are fed one by one, and the sheet can be fed.

When the paper is set on the paper feed tray with the opening / closing cover open, the maximum amount of paper stacked on the paper feed tray is moved by a predetermined distance from the paper feed tray by the regulating portion provided on the arm. Can be restricted to the position where the paper is placed on the paper feed table. Problems can be prevented, and a reliable paper feeding operation in which a plurality of papers stacked on a paper feeding table are fed one by one by a paper feeding roller can be obtained. In addition, since the restricting portion is provided on the arm, the structure for restricting the maximum amount of sheets stacked on the paper feed tray to a position at a predetermined distance from the paper feed tray can be simplified, which is advantageous in terms of manufacturing cost. .

According to a second aspect of the present invention, in the first aspect of the present invention, the arm includes a first arm located on the side of the sheet supply table when the opening / closing cover is open, and a sheet feeding mechanism from the first arm. A second arm portion extending to a side opposite to the table,
The arm portion is connected to the second arm with a step so as to be located outside the second arm portion in the sheet width direction, and the step forms the regulating portion. That is, the regulating portion can be provided on the arm with a simple structure in which the step between the first arm portion and the second arm portion forms the regulating portion. Other operations are the same as those of the first aspect.

A paper feeder according to a third aspect of the present invention is the paper feeder according to the second aspect, further comprising a side edge guide for guiding one side edge of the plurality of sheets stacked on the paper feed table, and the first arm portion includes: The regulating portion is provided so as not to protrude inward in the paper width direction from the guide surface of the side edge guide, and the restricting portion protrudes inward in the paper width direction from the guide surface of the side edge guide, and the paper on the paper feed table in a closed state of the opening / closing cover. Characterized by being provided away from the When the opening / closing cover is opened, a plurality of sheets are set on a sheet feed table with one side edge of the sheet being brought into contact with a side edge guide. At this time, the first arm unit does not interfere with the sheet, but the regulating unit regulates the maximum amount of the sheet. In addition, when the opening / closing cover is closed, the restricting portion is separated from the paper on the paper feed table, so that there is no resistance to the paper being fed. Other effects are the same as those of the second aspect.

According to a fourth aspect of the present invention, in the second aspect of the present invention, the arm is provided at a portion of the opening / closing cover on the side of the feeding roller, and the opening / closing cover is a shaft pivotally supporting a middle portion of the arm. With the portion as the rotation axis, the portion opposite to the paper feed roller is opened in a direction away from the paper feed table. That is, when the cover is opened, most of the upper surface of the paper feed tray can be opened, and when the paper is placed on the paper feed tray and slid toward the regulating portion, the maximum amount of paper can be naturally regulated. It is easy to set paper on a paper board. In addition, the same operation as the second aspect is achieved.

According to a fifth aspect of the present invention, there is provided a printing apparatus including the sheet feeding device according to any one of the first to fourth aspects, wherein the printing is performed by ejecting ink toward a sheet fed by a sheet feeding roller. It has an ink jet print head. That is,
The maximum amount of paper stacked on the paper tray is regulated to ensure reliable feeding operation, and the structure for regulating the maximum amount of paper stacked on the paper tray is simplified. Can be.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. The present embodiment is an example in which the present invention is applied to a paper feeding device that feeds a plurality of sheets stacked on a paper feeding table one by one and an ink jet printing apparatus equipped with the paper feeding device.

The ink jet printing apparatus 1 will be described. As shown in FIG. 1, an ink jet printing apparatus 1
The paper feeder 2 feeds a plurality of papers P stacked on the paper feed table 12 one by one, and a transport mechanism that transports the papers P fed by the paper feeder 2 to the print head 43 side. 35,
Printing mechanism 4 for printing by ejecting ink toward paper P
0, a paper discharge mechanism (not shown) for discharging the printed paper P to the outside, and a drive mechanism 50 for rotating and driving the paper feed roller 25 of the paper feed device 2 and the feed roller 36 of the transport mechanism 35.
(See FIG. 7). Note that a discharge roller (not shown) of the paper discharge mechanism is also rotationally driven by the drive mechanism 50.

The paper feeding device 2 will be described. 1 and 2
As shown in the figure, the paper feed device 2 is rotated in a state in which the paper P is in frictional contact with the upper surface of the paper P on the paper feed table 12 of the paper feed cassette 12 in which a plurality of papers P can be stacked and set. A plurality of (for example, two) paper feed rollers 25 that feed out the paper P one by one, and a plurality of (for example, two or more) that are provided coaxially with the paper feed roller 25 and maintain an interval between the paper P and the paper feed roller 25 at a predetermined interval (Six) collars 26 and the like. A pair of left and right side plates 3 at the upper end of the ink jet printing apparatus 1 rotatably support both ends of a rotating shaft 27 provided in the upper side of the paper feed table 12 in the paper width direction. , Two paper feed rollers 25 are mounted, and six collars 26 are rotatably mounted.

As shown in FIG. 3 and FIG.
Reference numeral 0 denotes a cassette main body 11 having a storage section 11a, a paper feed table 12 that can be stored in the storage section 11a and has an upper end pivotally connected to the cassette main body 11, and a paper feed direction in the paper width direction. A side edge guide 14 that is movably provided and guides a side edge of the sheet P placed on the sheet feeding table 12;
A pair of left and right springs 13 (corresponding to urging means) that are housed in 1a and urge the paper feed table 12 toward the paper feed roller 25 side.
And an opening / closing cover 16 for opening and closing the upper part of the paper feed table 12.
When the opening / closing cover 16 is opened, the sheet feeder 12 pushes both ends in the sheet width direction when the cover 16 is opened,
2 comprises a pair of arms 18 for moving the pair 2 away from the paper feed roller 25 against the urging force of the spring 13.

A portion of the sheet feeding table 12 facing the sheet feeding roller 25 has a friction portion 1 having a higher friction than other portions of the sheet feeding table 12.
5 are provided (see FIG. 2). The side edge guide 14
The paper feed table 12 has a guide portion 14a for holding the end opposite to the paper feed roller 25 from both sides, and is fixed at an arbitrary position in the paper width direction by the guide portion 14a. The opening / closing cover 16 is connected to the cassette body 1 via a pair of arms 18.
One pair of left and right standing walls 11b is connected to be openable and closable.

Next, the pair of arms 18 will be described. However, since the pair of left and right arms 18 has substantially the same structure,
The right arm 18 will be described. As shown in FIGS. 2 to 5, the arm 18 is formed integrally with a portion of the opening / closing cover 16 on the paper feed roller 25 side, and protrudes toward the paper feed roller 25 side. The arm 18 has a shaft portion 22 protrudingly provided on a right side surface of a substantially central portion, and the shaft portion 22 is provided on an upright wall portion 11 b (side edge guide) of the cassette body 11 around an axis parallel to the rotation shaft 27. Pivotably pivoted,
The opening / closing cover 16 is opened in a direction in which a portion opposite to the sheet feeding roller 25 is separated from the sheet feeding table 12.

The arm 18 has an end opposite to the opening / closing cover 16 with respect to the shaft 22 as a first arm 19, and a portion on the opening / closing cover 16 side as a second arm 21. A shaft 22 is provided. The first arm portion 19 is connected to the second arm portion 21 with a step 23 so as to be located outside the second arm portion 21 in the sheet width direction, and is located on the outer side in FIG.
As shown in the figure, the inner surface (guide surface) 11c of the standing wall portion 11b
Position so as not to protrude from Further, as shown in FIG. 2, the sheet feeding table 12 is located at a position facing the first arm 19.
It has a portion projecting outward in the sheet width direction from the guide surface 11c.

When the cover 16 is opened, as shown in FIG. 4, the first arm 19 pivots toward the paper feed table 12, and the distal end of the first arm 19 is used as a pushing portion 20 as a pusher 20.
Is pressed to separate the sheet supply table 12 from the sheet supply roller 25 against the urging force of the spring 13. At this time
The arm portion 21 extends to the opposite side of the sheet supply table 12 and has a step 23.
Opposes the sheet feeding table 12, and the step forms a regulating portion 23 that regulates the maximum amount of the paper P stacked on the sheet feeding table 12 at a position separated by a predetermined distance from the sheet feeding table 12.

When the first arm 19 rotates toward the paper feed table 12, the first wall 19b is provided at a position corresponding to the first arm 19 so that the first arm 19 does not collide with the vertical wall 11b. The recess is formed in the. When the opening / closing cover 16 is closed, as shown in FIG. 3, the first arm portion 19 separates from the paper feed table 12 and rises above the outer periphery of the collar 26 and the lower end of the rotation area of the paper feed roller 25 together with the regulating portion 23. To position. Further, the second arm portion 21 is located above the paper P on the paper feed table 12 and does not interfere with the paper feed.

The paper P is provided on one side edge guide 11b (FIG. 2).
Since the paper is set on the basis of the right side in FIG. The leading end of the paper P on the paper feed table 12 is connected to a wall 28 provided in the printing apparatus 1.
And positioned. The inclined wall 29 is formed so as to rise from the upper end of the wall 28 while advancing toward the transport mechanism 35. The inclined wall 29 functions as a separating unit that separates the sheet on the upper surface from the sheet below it along the inclined surface. Are set to have an appropriate angle. As the separating means, other separating means such as a friction pad may be used in addition to the inclined surface.

Next, the transport mechanism 35 will be described.
As shown in FIG. 1, the transport mechanism 35 includes a feed roller 36 that is rotationally driven by a drive mechanism 50, and a feed roller 36 that is rotatably provided at the tip of an arm 38 that is swingably provided above the transport path. Has a pressure roller 37 pressed against the upper surface of the feed roller 36 via an arm 38, and when the feed roller 36 is rotated in the forward direction (clockwise), the pressure roller 37 and the feed roller 36 P is conveyed to the print head 43 side.

The printing mechanism 40 will be described. As shown in FIG. 1, the printing mechanism 40 includes a carriage 41 guided by a guide rod 45 and a guide rail 46 so as to be movable in the left-right direction, and a holder fixed to the carriage 41. 42, a print head 43 attached to the rear end of the holder 42, an ink cartridge 44 detachably mounted on the holder 42 and supplying ink to the print head 43, and a carriage driving mechanism (shown in the drawing) for moving the carriage 41 in the left-right direction. Etc.) are provided. The print head 4
Reference numeral 3 denotes an ink jet type which ejects ink toward paper.

The driving mechanism 50 will be described. As shown in FIGS. 7 to 9, the driving mechanism 50 includes a stepping motor 51 that is driven and controlled in both forward and reverse rotation directions, a motor gear 52 fixed to a driving shaft of the stepping motor 51, and a motor gear 52. A reduction gear 53 meshed with the large diameter portion and driven to rotate; a feed gear 55 fixed to the end of the feed roller 36 and meshing with the small diameter portion of the reduction gear 53;
The sun gear 56 and the sun gear 5 that mesh with the feed gear 55
6, a pair of support frames 57, 58 provided rotatably about the rotation shaft 6, a first planetary gear 60 rotatably provided at an end of the support frame 57 and meshing with the sun gear 56, a support frame. 5
8 comprises a second planetary gear 61 rotatably provided at the end of the rotating shaft 27 and meshing with the sun gear 56, a sheet feeding gear 65 fixed to the end of the rotating shaft 27, a reversing gear 62 meshing with the sheet feeding gear 65, and the like. Have been.

The first planetary gear 60 has a support frame 57 at one end.
The feed gear 65 is fixed by the compression spring 63 fixed to the
Side of the second planetary gear 61, the support frame 58 is rotated when the sun gear 56 rotates in the reverse direction (clockwise).
Is rotated and meshes with the reversing gear 62 to rotate the paper feed roller 25 forward with the paper feed gear 65 while the sun gear 56
During the forward rotation (counterclockwise), the support frame 58 is rotated to move in a direction away from the reversing gear 62. Paper feed gear 65
Is a first planetary gear meshing portion 66 having a missing portion 67 and a second planetary gear meshing portion 68 having gear teeth formed on the entire outer peripheral portion.
When the missing portion 67 faces the first planetary gear 60, the sheet feeding gear 65 and the first planetary gear 60 do not mesh with each other.

The paper feeding operation of the paper feeding device 2 will be described. First, an initial state (that is, the previous paper feeding operation is completed,
In a state where the next sheet feeding operation is not started), the small-diameter outer peripheral portion 25b of the sheet feeding roller 25 faces the sheet P, and the driving mechanism 50 is in the initial state shown in FIG. In this state, when the stepping motor 51 is driven to rotate in the reverse direction (counterclockwise), the feed roller 36 rotates in the reverse direction (counterclockwise) together with the feed gear 55, and the paper P is moved downstream from the feed roller 36. 1 is stopped, while the support frame 58 rotates clockwise, and FIG.
As shown in FIG. 1, after the second planetary gear 61 meshes with the reversing gear 62, the paper feed roller 25 starts rotating in the forward direction (counterclockwise) together with the paper feed gear 65. In this state, the missing portion 67 of the paper feed gear 65 faces the first planetary gear 60.

The paper P is sent out to the transport mechanism 35 by a predetermined amount, and the leading end of the paper P comes into contact with the contact position between the feed roller 36 and the pressure roller 37. When the positioning is correctly performed with respect to 35, the driving direction of the stepping motor 51 is switched. At this time, as shown in FIG. 12, the first planetary gear meshing portion 66 is at a position facing the first planetary gear 60, the feed roller 36 rotates forward with the feed gear 55, and the support frame 58 is rotated counterclockwise. As shown in FIG. 13, the second planetary gear 61 separates from the reversing gear 62, and the sheet feeding gear 6 passes through the first planetary gear 60.
5, the paper feed roller 25 rotates forward, and the paper P is conveyed to the print head 43 side.

The operation of the sheet feeding device 2 will be described. When the opening / closing cover 16 is opened, the pushing portion 2 of the pair of arms 18 is moved.
0 pushes both ends in the sheet width direction of the sheet feeding table 12, and the sheet feeding table 12 is moved by the sheet feeding roller 25 against the urging force of the spring 13.
The sheet P is moved to a side away from the sheet feeder 12, so that the sheet P can be set on the sheet feed table 12. When the open / close cover 16 is closed, the sheet feed table 12 urged by the spring 13 is When the sheet feeding roller 25 is rotated to the side, the sheets P on the sheet feeding table 12 are fed one by one, and the sheet can be fed.

With the opening / closing cover 16 opened, the sheet feeding table 1
When the paper P is set on the upper surface 2, the opening / closing cover 16 is opened with its lower end as a fulcrum so that the upper portion is separated from the paper feed tray 12, so that almost the upper surface of the paper feed tray 12 is opened. The front part of the paper is placed and slid toward the paper feed roller 25. Then, the maximum amount of the paper P stacked on the paper feed tray 12 is regulated to a position separated by a predetermined distance from the paper feed tray 12 by the regulating part 23 provided on the arm 18. Cannot be set on the paper feed table 12. That is, there is a problem when the paper P having the maximum amount or more is placed on the paper feed tray 12, for example,
The reaction force of the spring 13 that urges the
It is possible to prevent the paper P from being strongly pressed against the paper feed roller 25 or to prevent the paper P from being double-fed due to a change in the positional relationship between the paper P and the separation means 29. The sheet feeding operation of feeding the sheets P one by one by the sheet feeding roller 25 is obtained.

In addition, in the paper feeding device 2, the first
With a simple structure in which a step between the arm portion 19 and the second arm portion 21 forms a regulating portion 23, the arm 18 has a regulating portion 23.
When the opening / closing cover 16 is opened or closed, it is possible to reliably prevent the sheet P stacked on the sheet feeding table 12 from interfering with the arm 18, and to transfer the sheet P to the sheet feeding table. The operation and effects such as the opening / closing cover 16 can be opened so as to be easily set on the camera 12.

FIG. 14 shows another embodiment, in which the surface 2 of the second arm portion 20 on the side opposite to the sheet feeding roller 25 is shown.
0a is an inclined surface descending toward the regulating portion 23.
Thus, when the stacked sheets are set, even if the sheets on the upper surface are raised, the sheets can be smoothly inserted under the regulating portion 20 without any support.

[0033]

According to the sheet feeding device of the first aspect, the urging means for urging the sheet feeding table toward the sheet feeding roller, the opening / closing cover for opening and closing the upper part of the sheet feeding table, and the opening / closing cover. A pair of arms for pushing the sheet-width end portions of the sheet feeding table when the opening / closing cover is opened to move the sheet feeding table away from the sheet feeding roller against the urging force of the urging means; The arm has a regulating portion that regulates the maximum amount of sheets stacked on the paper feed tray at a position separated by a predetermined distance from the paper feed tray when the open / close cover is open. When the paper is set on the paper feed tray, the maximum amount of the paper stacked on the paper feed tray can be regulated at a position separated by a predetermined distance from the paper feed tray by the regulating portion provided on the arm. Problem when a sheet of paper larger than the maximum amount is placed on a sheet feeder, for example, It is possible to prevent problems such as multi-feeding of paper due to increased pressure of the paper hitting the paper feed roller, and to ensure that multiple paper stacked on the paper feed table are fed one by one by the paper feed roller. Paper operation can be obtained. In addition, since the restricting portion is provided on the arm, the structure for restricting the maximum amount of sheets stacked on the paper feed tray to a position at a predetermined distance from the paper feed tray can be simplified, which is advantageous in terms of manufacturing cost. .

According to the sheet feeding device of the second aspect, the same effect as that of the first aspect is obtained, but the arm is provided with the first arm portion located on the sheet feeding table side when the opening / closing cover is open, and A second arm extending from the first arm to the side opposite to the sheet feeding table; the first arm is connected to the second arm with a step so as to be positioned outside the second arm in the sheet width direction; Since the step forms the regulating portion, the first
With a simple structure in which the step between the arm portion and the second arm portion forms a regulating portion, the regulating portion can be provided on the arm.

According to the sheet feeder of the third aspect, the same effect as that of the second aspect is obtained, but a side edge guide for guiding one side edge of a plurality of sheets stacked on the sheet feed table is provided, The first arm portion is provided so as not to protrude inward in the paper width direction from the guide surface of the side edge guide, and the regulating portion protrudes inward in the paper width direction from the guide surface of the side edge guide, and when the opening / closing cover is closed. It is provided so as to be separated from the paper on the paper feed table, so that when the opening / closing cover is opened, the paper can be set without interfering along the side edge guide, and when the opening / closing cover is closed, the regulating part is It is separated from the paper and does not give resistance to the fed paper.

According to the sheet feeding device of the fourth aspect, the same effect as that of the second aspect is obtained, but the arm is provided at a portion of the opening and closing cover on the sheet feeding roller side, and the opening and closing cover is provided in the middle of the arm. With the shaft part that supports the unit as the rotation axis, the part opposite to the paper feed roller is opened in the direction away from the paper feed tray, so that most of the upper surface of the paper feed tray can be opened, and If the paper is placed on the paper feeder and slid toward the regulating portion, the maximum amount of paper can be naturally regulated, and thus the paper can be easily set on the paper feed table.

According to the printing apparatus of the fifth aspect, the first to fifth aspects are as follows.
A sheet feeder, comprising: the sheet feeder according to claim 4; and an ink jet print head that ejects ink toward a sheet fed by a sheet feed roller to perform printing. Regulate the maximum amount of paper stacked on top,
As a result, a reliable paper feeding operation can be obtained, and the structure for regulating the maximum amount of paper stacked on the paper feeding table can be simplified.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a paper feeding device and a printing device equipped with the paper feeding device according to an embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrows II-II in FIG.

FIG. 3 is a vertical cross-sectional view of a sheet cassette (when an opening / closing cover is closed).

FIG. 4 is a vertical cross-sectional view of a sheet feeding cassette (when an opening / closing cover is opened).

FIG. 5 is a perspective view of an arm.

FIG. 6 is a vertical cross-sectional view of a paper feed cassette (when the open / close cover is closed when a maximum amount of paper is placed on a paper feed table).

FIG. 7 is a side view of the drive mechanism.

FIG. 8 is an enlarged view of a main part of the drive mechanism.

FIG. 9 is an enlarged view of a main part of a driving mechanism.

FIG. 10 is an operation explanatory view of a drive mechanism (initial state).

FIG. 11 is an operation explanatory view of a drive mechanism (when a second planetary gear is operated).

FIG. 12 is an operation explanatory diagram of a drive mechanism (at the time of drive switching).

FIG. 13 is an operation explanatory diagram of the drive mechanism (when the first planetary gear is operating).

FIG. 14 is an enlarged view of a main part of a sheet feeding device according to another embodiment.

[Explanation of symbols]

 P Paper 1 Inkjet printer 2 Paper feeder 12 Paper feeder 13 Spring (biasing means) 16 Opening / closing cover 18 Arm 19 First arm 21 Second arm 22 Shaft 23 Restrictor 25 Feed roller

Claims (5)

[Claims] 1. A sheet feeding device for feeding a plurality of sheets stacked on a sheet feeding table one by one by a sheet feeding roller, comprising: urging means for urging the sheet feeding table toward the sheet feeding roller; An opening / closing cover that covers the upper part of the sheet feeder so as to be openable and closable; provided on the openable / closable cover; Move 1 away from paper feed roller against urging force 1
A pair of arms, wherein the arm has a regulating portion that regulates a maximum amount of sheets stacked on the paper feed tray at a position spaced a predetermined distance from the paper feed tray when the opening / closing cover is open. Paper feeder. And a second arm extending from the first arm to a side opposite to the sheet feeder when the opening / closing cover is open. The first arm portion is connected to the second arm with a step so as to be located outside the second arm portion in the paper width direction,
The sheet feeding device according to claim 1, wherein the step forms the regulating portion. 3. A side edge guide for guiding one side edge of a plurality of sheets stacked on the sheet feeding table, wherein the first arm portion projects inward in a sheet width direction from a guide surface of the side edge guide. The regulating portion protrudes inward in the sheet width direction from the guide surface of the side edge guide, and is provided so as to be separated from the sheet on the sheet feeding table when the opening / closing cover is closed. Item 3. The paper feeding device according to Item 2. 4. The arm is provided on a portion of the opening / closing cover on a sheet feeding roller side, and the opening / closing cover has a shaft portion pivotally supporting an intermediate portion of the arm as a rotation axis, and is provided on a side opposite to the sheet feeding roller. 3. The sheet feeding device according to claim 2, wherein the portion is opened in a direction away from the sheet feeding table. 5. An ink jet print head, comprising: the paper feeder according to claim 1; and an ink jet head for ejecting ink toward a paper fed by a paper feed roller to perform printing. A printing device, characterized in that: