JPH1059555A - Paper supply device and printing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a side fringe guide which guides a side fringe part of paper from moving in the direction of paper width when an open and close cover is closed so as to prevent paper from being supplied while it is tilted. SOLUTION: When an open and close cover 16 is opened, an arm 18 pushes a paper supply base 12 to separate it from a paper supply roller 25. Paper P is set on the paper supply base 12 by moving a side fringe guide 14 freely in correspondence to paper size. When the open and close cover 16 is closed, the paper supply base 12 approaches the paper supply roller 25. At this time, if the side fringe guide 14 is at a predetermined position, one set of travel prevention members 20 are positioned in such a manner that they nip the side fringe guide 14 to prevent the side fringe guide 14 from moving in the direction of paper width when the open and close cover 16 is closed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding device for feeding a plurality of sheets stacked on a sheet feeding table one by one and a printing apparatus including the sheet feeding device, and more particularly, to a printing apparatus provided with the sheet feeding table. When the side edge guide for guiding the side edge portion of the sheet is at a predetermined position, the side edge guide is prevented from moving when the opening / closing cover is closed.

[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. Roller that feeds paper one sheet at a time while rotating in frictional contact with the upper surface of the paper, urging means that urges the paper supply table toward the paper supply roller side, and opens and closes the paper supply table to feed paper when open There is known an apparatus having an opening / closing cover for moving a table to a side away from a sheet feeding roller against the urging force of an urging means.

In this type of sheet feeding device, when the opening / closing cover is opened, the sheet feeding table moves to a side away from the sheet feeding roller, so that a plurality of sheets can be set on the sheet feeding table. When closed, the paper feed table is moved to the paper feed roller side by the urging means, and the color and the paper provided rotatably on the same axis as the paper feed roller come into contact with each other, and the space between the paper and the paper feed roller is fixed. When the paper feed roller is rotated in this state, the plurality of sheets stacked on the paper feed table are fed one by one. Further, in order to prevent the sheet on the sheet feeding table from being sent out at an inclination, a side edge guide abutting on a side edge of the sheet is moved and adjusted in accordance with the sheet width.

In a printing apparatus such as an ink jet type printing apparatus equipped with the above-mentioned paper feeder, the paper fed by the paper feeder is then fed by a transport mechanism having a feed roller and a pressure roller pressed by the feed roller. ,
The paper is sent to the print head and printed, but before the paper fed by the paper feeder is transported by the transport mechanism, the leading edge of the paper is brought into contact with the contact between the feed roller and pressure roller to temporarily Stop, and the sheet is bent between the sheet feeding device and the transport mechanism, and the position and the direction of the leading edge of the sheet are accurately positioned with respect to the transport mechanism, and then the feed roller is rotated in the sheet feeding direction. Thus, the paper feed amount is controlled in accordance with the rotation amount of the feed roller.

When the paper fed by the paper feeder is transported by the transport mechanism as described above, the paper feed roller is temporarily stopped. Even if the transport speed temporarily increases, in the case of ordinary thin paper, the above-described amount of flexure is extended, so that the transport by the transport mechanism is not supported. However, in the case of thick paper such as a postcard, since the above-described bending is not sufficiently formed, the paper feed roller becomes a resistance when the paper is transported by the transport mechanism, and the paper may not be transported normally.

In order to solve this problem, the present inventor has previously provided a cam that cooperatively rotates coaxially with the paper feed roller, provided a cam receiving portion that can abut the cam on a side edge guide, and provided a stepping motor. When the paper is started to be conveyed by the conveyance mechanism, the cam comes into contact with the cam receiving portion, and the paper feed table is moved away from the paper feed roller against the urging force of the urging means. (Patent Application No. 8-41571) by moving the paper feed roller so that the paper feed roller is not pressed against the paper so that the transport mechanism can transport the paper without receiving the resistance of the paper feed roller. .

[0007]

However, in the sheet feeding device, the side edge guide can freely move in the sheet width direction. In particular, in a device mounted on a small printing device or the like, the user can touch the side edge guide even after the paper is loaded, and if the user separates the side edge guide from the side edge of the paper, the paper is inclined. Will be sent. Moreover, the side edge guide is desirably as long as possible to enhance the paper guiding function.However, if the side edge guide extends near the paper feed roller, if the user freely moves the side edge guide, the side edge guide interferes with the paper feed roller. The rotation of the paper feed roller may damage the paper feed roller or the side edge guide. Particularly, as described above, in the case where the cam receiving portion is provided on the side edge guide, the cam receiving portion extends to a position where the cam receiving portion comes into contact with the cam, that is, a position corresponding to the sheet feeding roller, so that the side edge guide can be freely moved. If so, the cam receiving portion interferes with the sheet feeding roller in the same manner as described above.

Further, when a force for tilting the sheet is applied during the sheet feeding operation, the side edge guide may be pushed in the width direction by the sheet and may move. Thereafter, the remaining sheets are also sent out at an angle. In this case, if the side edge guide is long as described above or the side edge guide is provided with a cam receiving portion, the interference with the sheet feed roller is the same as described above.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sheet feeding device for feeding a plurality of sheets stacked on a sheet feeding table one by one, and a printing apparatus including the sheet feeding device, wherein a side edge of the opening / closing cover is in a closed state. An object of the present invention is to prevent the guide from moving and to prevent the paper from being fed at an angle. Also, long side guides,
Alternatively, in the case where the side edge guide is provided with the cam receiving portion, by preventing the side edge guide from moving, it is possible to prevent the side edge guide from interfering with the sheet feeding roller and to damage the side edge guide and the sheet feeding roller. Is to prevent it. It is another object of the present invention to prevent the side edge guide from being used at a position other than the predetermined position and to achieve the guide function without moving at the predetermined position as described above.

[0010]

According to the present invention, there is provided a paper feeder comprising:
In a paper feeding device that feeds a plurality of sheets stacked on a paper feed tray one by one, a paper feed roller that rotates while frictionally contacting an upper surface of the paper on the paper feed tray and feeds the paper one by one. ,
An urging means for urging the paper feed tray toward the paper feed roller, and a cover openably closable to cover the paper feed tray, and when the paper feed tray is opened, the paper feed tray is moved away from the paper feed roller against the urging force of the urging means. An opening / closing cover to be moved, a side edge guide movably provided in the sheet feeding table in the sheet width direction, and guiding a side edge of the sheet placed on the sheet feeding table;
A movement preventing member for preventing movement of the side edge guide when the open / close cover is closed when the side edge guide is at a predetermined position set in advance.

When the opening / closing cover is opened, the sheet feeding table moves to the side away from the sheet feeding roller against the urging force of the urging means,
The side edge guide is positioned at a position corresponding to the sheet width, and a plurality of sheets can be set on the sheet supply table. When the opening / closing cover is closed, the paper feed tray is moved to the paper feed roller side by the urging means, and the paper can be fed from the paper feed tray, but the side edge guide is at a predetermined position. At one time, movement of the side edge guide in the closed state of the opening / closing cover is prevented by the movement preventing member.

In the predetermined position, the side edge guide is
The side edge guide is set at a position corresponding to the width of the sheet to be set, that is, a position to guide the side edge of the sheet to be set, and the side edge guide is located at this predetermined position with the opening / closing cover closed. Thus, even if the side edge guide attempts to move, the movement preventing member prevents the side edge guide from moving, so that the guide function of the side edge guide during the sheet feeding operation can be reliably maintained. Further, when the side edge guide is long, the side edge guide is set at the predetermined position so as not to interfere with the sheet feeding roller when the opening / closing cover is closed, and the movement of the side edge guide is prevented as described above, It is possible to reliably prevent the side edge guide from interfering with the paper feed roller and the like, and from damaging the side edge guide and the paper feed roller.

According to a second aspect of the present invention, in the first aspect, the movement preventing members are provided at a plurality of positions corresponding to a plurality of sheet widths.
That is, when sheets of various widths are selectively stacked and set on the sheet feeding table, the movement of the side edge guide can be prevented at a position corresponding to each sheet width by the movement preventing member. Other claim 1
It has the same function as.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the side edge guide has a guide portion for nipping the end of the sheet feeding table opposite to the sheet feeding roller from both front and back sides. And is guided in the sheet width direction through the guide section. That is, the structure for guiding the side edge guide to the sheet feeding table so as to be movable in the sheet width direction can be simply configured, which is very advantageous in terms of manufacturing cost. On the other hand, the side edge guides are easy to move, so they may easily move when touched by the user or may move when the paper is fed with a slant. it can. In addition, the same operation as the first or second aspect is achieved.

According to a fourth aspect of the present invention, there is provided the paper feeding apparatus according to any one of the first to third aspects, further comprising a cam that rotates coaxially with the paper feeding roller and is brought into contact with the cam. A side edge guide is provided with a cam receiving portion which is pushed and moves the sheet feeding table away from the sheet feeding roller against the urging force of the urging means, and when the cam receiving portion is at a position where it comes into contact with the cam, The movement preventing member prevents movement of the side edge guide when the opening / closing cover is in a closed state. If the side edge guide is provided with a cam receiving portion, when the side edge guide is moved in the paper width direction in a state where the opening / closing cover is closed, the cam receiving portion interferes with the paper feed roller or the like. When the movement preventing member is at the predetermined position, the movement of the side guide in the closed state of the opening / closing cover is prevented. It is possible to reliably prevent the parts, the feed rollers and the like from being damaged. Others The same operation as any one of claims 1 to 3 is achieved.

According to a fifth aspect of the present invention, in the second aspect of the present invention, there is provided a closing prevention member for preventing the opening and closing cover from being closed when the side edge guide is at a position other than the predetermined position. It is a thing. That is, when the open / close cover is closed, only when the side edge guide is at a predetermined position,
The opening / closing cover can be closed, and after the closing, the movement of the side edge guide can be reliably prevented as described above. Other effects are the same as those of the second aspect.

According to a sixth aspect of the present invention, there is provided a printing apparatus including the sheet feeding apparatus according to any one of the first to fifth 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,
In a printing apparatus provided with an ink jet print head, by providing the paper feeder according to any one of claims 1 to 5, when the side edge guide is at a predetermined position set in advance, the movement preventing member is provided. Prevents the side edge guide from moving when the opening / closing cover is closed, so that the side edge guide reliably achieves the paper guide function, preventing printing on inclined paper and paper jams in the printing device. become able to.

[0018]

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 and the printed paper P is transferred to the ink jet printing apparatus 1
A paper discharge mechanism (not shown) for discharging paper to the outside, a paper feed roller 25 of the paper feeder 2 and a feed roller 3 of the transport mechanism 35
A drive mechanism 50 (see FIG. 5) for rotating the motor 6 is provided. Although not shown, the discharge roller of the paper discharge mechanism is also driven to rotate 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 paper feed roller 25 for feeding the paper P one by one; a collar 26 provided coaxially with the paper feed roller 25 to maintain a predetermined interval between the paper P and the paper feed roller 25;
A cam mechanism 30 and the like for temporarily moving the paper feed table 12 to a side away from the paper feed roller 25 when the rotation of the paper feed roller 25 is provided.

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 that covers the sheet feeding table 12 so as to be able to open and close.

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 is provided slightly protruding from the paper feed table 12 (see FIG. 2). The side edge guide 14 has a guide portion 14a for nipping an end of the sheet supply table 12 opposite to the sheet supply roller 25 from both the front and back sides, and is frictionally fixed at an arbitrary position in the sheet width direction by the guide portion 14a. . The cam receiving portion 32 of the cam mechanism 30 contacts the sheet feeding table 12 at a position including a position substantially perpendicular to the sheet feeding table 12 from the rotation shaft 27 at a portion of the side edge guide 14 on the sheet feeding roller 25 side. It is provided.

The opening / closing cover 16 has a cover body 17 and a pair of left and right arms 18 fixed to the cover body 17.
A substantially central portion of these arms 18 is rotatably connected to a pair of left and right standing walls 11b of the cassette body 11 by a shaft 18a. The end of each arm 18 is formed in a pushing portion 19 for pushing the sheet feeding table 12, and when the opening / closing cover 16 is opened from the closed state in FIG. 3, as shown in FIG. The sheet feeding table 12 moves to the side away from the sheet feeding roller 25 against the urging force of the pair of springs 13 by the pushing portion 19 of 18.

As shown in FIG. 2 to FIG.
On the inner surface of the pair of movement preventing members 20 at three positions corresponding to a plurality of, for example, three types of paper widths, that is, at positions where the side edge guides 14 can guide the side edges of the three types of paper.
Are set as one set, and the three sets of movement prevention members 20 are
4 project in the length direction. At positions other than the positions at which the side edge guides 14 can guide the side edges of the three types of sheets, the closing prevention member 23 is provided in a rib shape extending in the sheet width direction. That is, when the opening / closing cover 16 is opened, the sheet feeding table 12 is lowered by the rotation of the arm 18, and the opening / closing cover 16 is sufficiently separated from the sheet feeding table 12, so that the side edge guide 14 moves along the sheet feeding table 12. You can move freely.

When the side edge guide 14 is located at a position where it can guide any one of the three types of sheets, when the cover 16 is closed, the sheet feeding table 12 25 and open / close cover 1
By accommodating the side edge guide 14 between the set of movement preventing members 20 as the sheet 6 approaches the paper feed table 12, it can be normally closed. Also, one set of movement preventing members 2
By positioning the side edge guide 14 so as to sandwich the side edge guide 14 from both sides, the side edge guide 14 is prevented from moving in the sheet width direction.

When the side edge guide 13 is located at a position other than the position where the side edge guides of the three types of paper can be guided, even if the open / close cover 16 is to be closed, the closing prevention member 23 is The opening and closing cover 16 is closed by contacting the upper end. Here, the three positions corresponding to the three types of paper width are defined as the positions of the side edge guides 14 corresponding to the left edge of the vertical postcard with reference to the right standing wall portion 11b in FIG. ), The same position corresponding to the postcard in the horizontal position (shown by a solid line), and the same position corresponding to A4 size paper. If necessary, other positions corresponding to the B5 size or the like can be provided.

As shown in FIGS. 1 and 2, both ends of a rotating shaft 27 are rotatably supported on a pair of left and right side plates 3 provided in the ink jet printing apparatus 1, and a plurality of (for example, 2 The paper feed rollers 25 are fixed to the rotation shaft 27 and rotate with the rotation of the rotation shaft 27, and a plurality (for example, 6
) Collar 26 is rotatably mounted on a rotating shaft 27. The feed roller 25 has a large-diameter outer peripheral portion 25a formed slightly larger in diameter than the collar 26 over approximately 180 degrees,
It is formed in a sector shape in side view having a small diameter outer peripheral portion 25b. That is, when the paper P is brought into contact with the collar 26 and the paper feed roller 25 is rotated while the space between the paper P and the paper feed roller 25 is maintained at a predetermined interval, the paper feed roller 25 is placed on the upper surface of the paper P.
Is in frictional contact with the large-diameter outer peripheral portion 25a, and the sheet P is sent out to the transport mechanism 35 side.

The transport mechanism 35 will be described. As shown in FIG. 1, the transport mechanism 35 is rotatably provided on a feed roller 36 that is rotationally driven by a drive mechanism 50 and an end of an arm 38 that is swingably provided above the transport path.
A pressure roller 37 pressed against the upper surface of the feed roller 36 via an arm 38 by a spring 39; and when the feed roller 36 is rotated in the forward direction (clockwise), the pressure roller 37 and the feed roller 3 are rotated.
The paper P is conveyed to the print head 43 side by 6.

The cam mechanism 30 will be described. The cam mechanism 30 includes a pair of cams 31 fixed to the rotation shaft 27 so as to rotate coaxially with the paper feed roller 25, and a cam receiving portion 32 provided at a lower end of the side edge guide 14. 1
The pair of cams 31 are arranged at positions corresponding to the side edge guides 14 that guide the side edges of the postcard set in the vertical and horizontal directions. When the paper feed roller 25 rotates and the postcard is sent out by a predetermined amount, the cam mechanism 30 operates and the cam 31
Comes into contact with the cam receiver 32, and the paper feed table 12
3 is moved to the side away from the paper feed roller 25 against the urging force.

The printing mechanism 40 will be described. As shown in FIG. 1, the printing mechanism 40 has a carriage 41 guided movably in the left-right direction by a guide rod 45 and a guide rail 46, a holder 42 fixed to the carriage 41, and a rear end of the holder 42. A print head 43, an ink cartridge 44 detachably mounted on the holder 42 and supplying ink to the print head 43, a carriage driving mechanism (not shown) for moving the carriage 41 in the left-right direction, and the like are provided. The print head is an ink jet type that prints by ejecting ink toward paper.

The drive mechanism 50 will be described. As shown in FIGS. 5 to 7, 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 that is fixed to a driving shaft of the stepping motor 51 and that is driven to rotate, A reduction gear 53 meshed with the gear 52 at the large diameter portion and driven to rotate, a feed gear 55 fixed to the end of the feed roller 36 and meshed with the small diameter portion of the reduction gear 53, and a sun gear meshed with the feed gear 55 56,
The support frame 57 is provided rotatably around the rotation axis of the sun gear 56, and is rotatably provided at both ends of the support frame 57. The first and second planetary gears 60 and 61 that rotate around the sun gear 56 with the rotation, and the sun gear 5
6 rotates forward with the rotation of the support frame 57 during forward rotation of the support frame 57 (counterclockwise), and rotates forward when the sun gear 56 rotates in the reverse direction (clockwise) as the sun gear 56 rotates. It is composed of a feed gear 63 and the like that mesh with each other via a second planetary gear 61 and a reversing gear 62 in accordance with the movement and are driven to rotate forward.

The paper feeding operation of the paper feeding device 2 will be described. First, in the initial state (ie, when the previous paper feeding operation is completed,
In the state where the next sheet feeding operation has not been started), the small-diameter outer peripheral portion 25b of the sheet feeding roller 25 faces the sheet P, and FIG.
As shown in (1), the drive mechanism 50 is in the initial state. In this state, when the stepping motor 51 is driven to rotate in the reverse direction (counterclockwise), the feed gear 55
The feed roller 36 rotates in the reverse direction (counterclockwise)
Then, while the conveyance of the paper P to the downstream side of the feed roller 36 is stopped, the support frame 57 rotates clockwise, and as shown in FIG. After that, the paper feed roller 25 starts to rotate in the forward direction (counterclockwise) together with the paper feed gear 63.

When the paper feed roller 25 rotates to the position shown in FIG. 10, the paper P is sent out by a predetermined amount toward the transport mechanism 35, 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. However, as shown in FIG. 12, if the set sheet P is a normal thin sheet, the sheet P is bent as shown by a chain line. If the set sheet P is thick, such as a postcard, when the leading end of the sheet P contacts the above position, the sheet feeding roller 25 slips on the sheet without bending. In this case, since the side edge guide 14 is located at the position corresponding to the postcard, after the contact, the cam mechanism 30 is operated to push down the sheet feeding table 12 in the direction of the arrow in the figure, and the sheet feeding roller 25 is separated from the sheet. .

Next, from the state of FIG. 10, when the stepping motor 51 is rotated in the forward direction by switching the rotation direction, the feed roller 36 rotates forward with the feed gear 55, and the support frame 57 rotates counterclockwise. As shown in FIG. 11, the second planetary gear 61 separates from the reversing gear 62, the first planetary gear 60 meshes with the sheet feeding gear 63, and the sheet feeding roller 25 together with the sheet feeding gear 63 rotates forward. Rotate. When the drive of the stepping motor 51 is switched, the paper feed gear 25 stops for a short time until it meshes with the first planetary gear 60, while the feed roller 36 starts to convey the paper P. , The amount of the above-mentioned bending is extended, and the sheet can be conveyed without any support during the stop time. In the case of thick paper such as a postcard, since the paper feed roller 25 is separated from the paper P as described above, the feed roller 36 does not receive the resistance due to the stop of the paper feed roller 25, and The transfer can be performed accurately.

The feed gear 25 has a missing portion 64 in which no teeth meshing with the first planetary gear 60 are provided. When the missing portion 64 arrives at the position of the first planetary gear 60, both of the two are stopped. After the disengagement, the rotation drive of the feed roller 36 is connected, but the paper feed roller 25 is stopped at the initial position in FIG. 8 and driven to rotate until the next paper feed operation is started. There is no.

Next, the operation of the sheet feeding device 2 will be described. As shown in FIG. 4, when the cover 16 is opened,
The paper feed table 12 moves away from the paper feed roller 25 against the urging force of the pair of springs 13, and the cam receiving portion 32 also moves the paper feed roller 2.
6, the side edge guide 14 is positioned at a position corresponding to the sheet width, and the plurality of sheets P
2 can be set.

As shown in FIG. 3, when the opening / closing cover 16 is closed, the paper feed table 12 is urged by the pair of springs 13 to move toward the paper feed roller 25, and the paper P comes into contact with the collar 26. The paper P and the paper feed roller 25 are maintained at a predetermined interval, and the paper P can be fed from the paper feed table 12, but the side edge guide 14 is moved to a predetermined position, that is, the paper width. When in the corresponding position, the movement preventing member 20 prevents the movement of the side edge guide 14.

If the upper end between the cassette main body 11 and the opening / closing cover 16, that is, the end opposite to the paper feed roller 25 is open to accommodate sheets longer than the paper feed cassette 10, the open Put your hand from the side edge guide 14
May be moved. Especially the side edge guide 14
Can be moved by a slight force because the sheet guide table 14a is sandwiched between the sheet feeding table 12 and the guide unit 14a. Can be reliably achieved. Also,
When a force for tilting the sheet is applied during the feeding of the sheet, the side edge guide may also be pushed in the width direction by the sheet and move, but this can be prevented by the above configuration.

Further, the side edge guide 14 is
In the case where the side edge guide 14 is long enough to face the collar 26 or has the cam receiving portion 32 at a position facing the cam 31, the side edge guide 14 is moved as described above, Sometimes, the side edge guide 14 and the cam receiving portion 32 interfere with the paper feed roller 25, the collar 26, the friction portion 15, and the cam receiving portion 32, the paper feed roller 25, the collar 26, the friction portion 15 and the like are damaged. Yes, but it can be reliably prevented.

When the side edge guide 14 is at the preset predetermined position, the openable cover 16 can be closed as shown in FIG. At a position other than the specified position
Since the closing prevention member 20 prevents the opening / closing cover 16 from being closed, the side edge guide 14 can be arranged at a position for guiding a predetermined side edge of the sheet, and the guides for those sheets can be guided. Functions can be reliably achieved. Further, as described above, the side edge guide 14 is long until the side edge guide 14 faces the paper feed roller 25 and the collar 26,
In the case where the cam receiving portion 32 is located at a position facing
If the side edge guide 14 and the cam receiving portion 32 attempt to close the opening / closing cover 16 at a position facing the sheet feeding roller 25 or the collar 26, the closing prevention member 20 prevents the closing, so that they interfere with each other. , Can be prevented from being damaged.

Next, a paper feeder 2A of another embodiment will be described. However, the same components as those in the above embodiment will be described with the same reference numerals. As shown in FIGS. 13 and 14, in a sheet feeding device 2 </ b> A of another embodiment, in the sheet feeding device 2, the closing prevention member 23 of the opening / closing cover 16 is omitted, and three types of paper on the inner surface of the opening / closing cover 16 are provided. At three positions corresponding to the width,
Three sets of the movement inhibiting members 20A are provided so as to protrude from the pair of movement inhibiting members 20A. That is, the same effect as that of the sheet feeding device of the above embodiment can be achieved except for the effect of the closing prevention member 23. Further, it is needless to say that the present invention can be implemented even if the cam mechanism 30 is omitted.

[0042]

According to the paper feeder of the present invention, the paper feed roller which rotates in frictional contact with the upper surface of the paper on the paper feed base and feeds the paper one by one, and feeds the paper feed base. An urging means for urging the roller side, an opening / closing cover for covering the sheet feeding table so as to be openable and for moving the sheet feeding table away from the sheet feeding roller against the urging force of the urging means when opened; A side edge guide movably provided in the sheet width direction on the sheet table to guide a side edge portion of the sheet placed on the sheet supply table, and an opening / closing cover when the side edge guide is at a predetermined position. And a movement preventing member for preventing the movement of the side edge guide in the closed state, the side edge guide moves when the side edge guide is located at the predetermined position with the open / close cover closed. Even if you try to do so, the movement-preventing member will prevent the side edge guide from moving, The side edge guide of the guide function can be reliably held that. In addition, when the side edge guide is long, it is possible to reliably prevent the side edge guide from interfering with the paper feed roller and the like, thereby damaging the side edge guide and the paper feed roller.

According to the paper feeder of the second aspect, the same effect as that of the first aspect is obtained, but since the movement preventing members are provided at a plurality of positions corresponding to a plurality of paper widths, respectively, When the sheet is selectively set on the sheet feeding table, the movement of the side edge guide can be prevented at positions corresponding to various widths by the movement preventing member.

According to the sheet feeding device of the third aspect, the same effect as that of the first or second aspect can be obtained, but the side edge guide has an end opposite to the sheet feeding roller of the sheet feeding table on both sides. Since it is guided in the paper width direction through this guide portion, a structure for guiding the side edge guide to the paper feed table so as to be movable in the paper width direction can be easily configured, This is very advantageous in terms of manufacturing cost. In addition, although the side edge guide is easily moved by this, the movement can be prevented by the movement preventing member, and the desired effect can be achieved.

According to the sheet feeding device of the fourth aspect, the first to fourth aspects are as follows.
According to the third aspect of the present invention, the same effect as in any one of the third aspect is obtained, but a cam that rotates coaxially and coaxially with the paper feed roller is provided, and the paper feed table is pushed by the contact with the cam to apply the urging means. A cam receiving portion is provided on the side edge guide to move away from the paper feed roller against the force, and when the cam receiving portion is at a position where it comes into contact with the cam, the movement preventing member is in the closed state of the open / close cover. Since the side edge guide is prevented from moving, if the side edge guide is provided with a cam receiving portion, when the side edge guide is moved in the sheet width direction in a state where the opening / closing cover is closed, the cam receiving portion is provided with a paper feed roller. However, when the side edge guide is at a predetermined position, the movement preventing member prevents the side edge guide from moving when the opening / closing cover is closed. Interferes with the paper feed roller, etc. Parts, can be reliably prevented paper feed roller or the like from being damaged.

According to the sheet feeding device of the fifth aspect, the same effect as in the second aspect is obtained, but when the side edge guide is at a position other than the predetermined position, the closing of the openable cover is prevented. Since the closing prevention member is provided, the opening / closing cover can be closed only when the side edge guide is at a predetermined position when closing the opening / closing cover in the open state, and after closing, the side edge guide can be closed as described above. Movement can be reliably prevented.

According to a sixth aspect of the present invention, there is provided a printing apparatus including the paper feeding apparatus according to any one of the first to fifth aspects, wherein the printing is performed by ejecting ink toward a sheet fed by a sheet feeding roller. Since the ink jet print head is provided, when the side edge guide is located at a predetermined position set in advance, the movement preventing member prevents the side edge guide from moving in the closed state of the opening / closing cover. And paper jams in the printing apparatus can be prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an ink jet printing apparatus equipped with a sheet 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 longitudinal sectional view of a sheet cassette (when an opening / closing cover is closed).

FIG. 4 is a longitudinal sectional view of a sheet cassette (when an opening / closing cover is opened).

FIG. 5 is a side view of the driving mechanism.

FIG. 6 is an enlarged view of a main part of the drive mechanism.

FIG. 7 is an enlarged view of a main part of the drive mechanism.

FIG. 8 is an operation explanatory view of a drive mechanism (initial state).

FIG. 9 is a diagram illustrating the operation of the drive mechanism (when the second planetary gear is operating).

FIG. 10 is an operation explanatory diagram of a drive mechanism (at the time of drive switching).

FIG. 11 is an operation explanatory diagram of the drive mechanism (when the first planetary gear is operated).

12 is a cross-sectional view of a main part of the sheet feeding device corresponding to FIG.

FIG. 13 is a longitudinal sectional view of an ink jet printing apparatus provided with a sheet feeding device according to another embodiment.

14 is a view taken in the direction of arrows XIV-XIV in FIG. 13;

[Explanation of symbols]

 P paper 1 Ink-jet printing device 2, 2A paper feeder 10, 10A Paper feed cassette 12 Paper feed table 13 Spring 14, 14A Side edge guide 14a Guide 16 Opening / closing cover 20 Move prevention member 23 Closing prevention member 25 Paper feed roller 31 cam 32 cam receiving part

Claims (6)

[Claims] 1. A sheet feeding device for feeding a plurality of sheets stacked on a sheet feeding table one by one, wherein the sheet is rotated in frictional contact with an upper surface of the sheet on the sheet feeding table, and one sheet of paper is rotated. A sheet feeding roller that feeds the sheet feeding table, an urging unit that urges the sheet feeding table toward the sheet feeding roller, and a cover that opens and closes the sheet feeding table. An opening / closing cover that moves to a side away from the paper feed roller, and a side edge guide that is provided on the paper feed table so as to be movable in the paper width direction, and guides a side edge of the paper placed on the paper feed table, When the side edge guide is at a predetermined position set in advance,
And a movement preventing member for preventing movement of the side edge guide when the opening / closing cover is closed. 2. The sheet feeding device according to claim 1, wherein the movement preventing members are provided at a plurality of positions corresponding to a plurality of sheet widths, respectively. 3. The side edge guide has a guide portion for nipping an end of the sheet feeding table opposite to the sheet feeding roller from both front and back sides,
The sheet feeding device according to claim 1, wherein the sheet is guided in a sheet width direction through the guide portion. 4. A cam that rotates coaxially with the paper feed roller and is pushed by contact with the cam to separate the paper feed table from the paper feed roller against the urging force of the urging means. A side edge guide is provided with a cam receiving portion to be moved to the side, and when the cam receiving portion is at a position where it comes into contact with the cam, the movement preventing member prevents the side edge guide from moving when the opening / closing cover is closed. The sheet feeding device according to any one of claims 1 to 3, characterized in that: 5. A feeding device according to claim 2, further comprising a closing prevention member for preventing the opening and closing cover from being closed when the side edge guide is at a position other than the predetermined position. Paper equipment. 6. An ink jet print head, comprising: the paper feeding device according to claim 1; and an ink jet head for ejecting ink toward a paper fed by a paper feeding roller to perform printing. A printing device, characterized in that: