JPH0858987A - Paper feeder - Google Patents

Abstract

PURPOSE: To prevent bending of a point end edge of a paper sheet, in the case of supplying it and simplify the structure, in a paper feeder supplying the laminated paper sheets successively from the paper sheet in the lowermost layer. CONSTITUTION: In the case of supplying paper, by lowering down a paper sheet loading plate 17 to a paper feed passage 6, rollers 3, 4, 5 including a paper feed roller 3 are protruded upward from opening parts 14, 15, 16 of the paper sheet loading plate 17, to come into contact with a paper sheet 2, so as to feed the paper sheet 2 in the lowermost layer to a paper sheet passing gate 10 by rotating the paper feed roller 3. In the case of storing the paper sheet 2 in a paper sheet storage part 1, by lifting the paper sheet loading plate 17 by a loading plate lift means 20, a point end edge of the paper sheet 2 is prevented from receiving resistance from the rollers 3, 4, 5, and to prevent infiltrating a paper sheet in the paper sheet passing gate 10 by the paper sheet loading plate 17 positioned in a lift position.

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 stacked sheets one by one from the bottom.

[0002]

2. Description of the Related Art In an office machine, there is a sheet feeding device that feeds stacked sheets of paper one by one from below. An example of the related art will be described with reference to FIGS. In this conventional example, a paper sheet storage unit 101 is formed on the front surface of a casing 100 such as a printer, and a paper feed roller 102, a paper sheet detection roller 103, and an auxiliary roller 104 are freely rotatable on the bottom surface of the paper sheet storage unit 101. , The paper sheets 105 stored in the paper sheet storage unit 101 in a stacked state are pressed downward by the weight 106, and the paper sheets 105 (see FIG. 4) stacked by driving the sheet feeding roller 102 are sequentially moved from the bottom. Paper is fed sheet by sheet. The bottom of the paper storage unit 101 has a paper feed path 10
7, the paper feed roller 102, the paper sheet detection roller 103, and the auxiliary roller 104 have a part of their outer circumferences projected upward from the paper feed passage 107.

In this case, since the paper sheet 105 is supported by the paper feed roller 102 and the auxiliary roller 104 which are arranged at a predetermined interval, the paper sheet 105 is maintained in a substantially horizontal state. Although not shown, the paper sheet detection roller 103 is rotatably held by a part of a displaceable arm, and by biasing this arm upward, the paper sheet detection roller 103 elastically contacts the paper sheet 105 in the lowermost layer. Therefore, when the paper sheet 105 on the paper feed path 107 disappears, the arm moves in the direction in which the paper sheet detection roller 103 is displaced upward. Therefore, by detecting the movement of this arm by a detector (not shown). , Paper sheet storage unit 101
It is possible to know the state in which the inner paper sheet 105 is gone.

Further, as shown in FIG.
1 is provided with a partition plate 108 extending upward from a portion of the paper feed path 107 on the downstream side of the paper feed roller 102 and supporting an edge of the paper sheet 105 on the leading end side in the transport direction. A paper sheet passage gate 109 is formed between the lower edge of the paper sheet 108 and the paper feeding path 107. When the paper sheet 105 is stored in the paper sheet storage unit 101, the paper sheet 105 is fed to the auxiliary roller 1
When inserted diagonally from the 04 side, the paper sheet 10 located in the lower layer
The leading edge of the sheet 5 enters the sheet passing gate 109 and bends, causing a jam. In order to prevent such a situation, when the paper sheet 105 is stored in the paper sheet storage unit 101, the paper sheet passage gate 109 is blocked by the stopper 110, and the stopper 110 is retracted downward when shifting to the paper feeding operation. The structure is adopted. Incidentally, JP-A-2-
Japanese Patent No. 286527 discloses that the shutter shuts off the gate of the sheet feeding passage, but the effect is the same as the effect of the stopper shown in FIG.

[0005]

As shown in FIG. 4, when the sheet 105 is stored from the front side to the rear side of the sheet storage unit 101 (the sheet passage gate 109 side), the motor is stopped. Therefore, the paper feed roller 102 does not rotate under the load of the power transmission system. Further, since the paper feed roller 102, the paper sheet detection roller 103, and the auxiliary roller 104 project from the paper feed path 107, the paper sheet 105 in the lower layer receives resistance from at least the stopped paper feed roller 102. This allows
The leading edge of the paper sheet 105 may be bent. In this case, since the operator is looking from above, the lower paper sheet 105
In some cases, the sheet 105 may not be noticed and the sheet 105 may be fed with the front end bent. As a result, the paper sheet 1
There is a problem in that the leading edge of 05 is caught at the paper sheet passing gate 109 and a jam occurs. The example described in Japanese Patent Laid-Open No. 2-286527 also has a structure in which such a problem may occur.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a paper sheet storage section for storing a large number of stacked paper sheets, and a part of the outer periphery from the paper feed passage which is the lowermost surface of the paper sheet storage section is provided. A roller including at least a paper feed roller protruding upward, and a partition plate extending upward from a portion of the paper feed passage downstream of the roller and supporting an edge of the paper sheet on the leading end side in the transport direction. A paper sheet passage gate formed in the vicinity of a position where the paper feed passage and an extension surface of the partition plate intersect with each other, and an opening portion through which the roller protrudes, and the paper passage passage gate is arranged along the paper feed passage. A paper sheet placing plate movably provided upward with respect to the paper feeding path, a paper sheet holding means for pushing down the uppermost surface of the paper sheet stacked on the paper sheet placing plate, and the paper sheet. At the time of storing the paper sheet in the leaf storage unit, the paper sheet placing plate is at least the apex of the roller. Substantially a structure in which and a mounting plate elevating means for raising to the top of the same level of the position and the paper sheet passes through the gate.

[0007]

According to the present invention, at the time of sheet feeding, the sheet stacking plate is lowered to the sheet feeding path, and the roller including the sheet feeding roller is projected upward from the opening portion of the sheet stacking plate so that the lowermost layer is formed. When the paper sheet is brought into contact with the paper sheet, the lowermost paper sheet is fed to the paper sheet passage gate by the rotation of the paper feed roller, and the paper sheet is stored in the paper sheet storage section,
By raising the sheet placing plate by the placing plate elevating means, the leading edge of the sheet does not receive resistance from the roller, and the invasion of the sheet into the sheet passing gate is located at the rising position. It can be prevented by the paper sheet mounting plate.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIG. FIG. 1A is a vertical sectional side view showing an empty paper sheet storage unit 1, and FIG. 1B is a vertical sectional side view showing the paper sheet storage unit 1 in which paper sheets 2 are stored. Although not shown, the paper storage unit 1 is formed in a part of a casing of an office machine that handles paper 2 such as a printer or an image reading device, and guides both sides of the paper 2 to both sides. It has a side plate (not shown). Below the sheet storage unit 1, a sheet feed roller 3, a sheet detection roller 4, and an auxiliary roller 5 are rotatably provided. Part of the outer circumferences of these rollers 3, 4, 5 are projected upward from the paper feed path 6 which is the lowermost surface of the paper sheet storage unit 1. That is, the base 7 forming the paper feed passage 6 is formed with the opening 8 through which the rollers 3, 4, and 5 are projected upward. Similar to the auxiliary roller 104 (see FIGS. 2 to 4) in the conventional example, the auxiliary roller 5 is for supporting the paper sheet 2 substantially horizontally together with the paper feeding roller 3 provided at a predetermined distance. Like the conventional paper sheet detection roller 103, the paper sheet detection roller 4 is also rotatably attached to an arm (not shown) that is biased upward and is displaced depending on the presence or absence of the paper sheet 2 in the paper sheet storage unit 1. Is held.

The paper feed roller 3 is provided in the paper sheet storage unit 1.
A partition plate 9 is provided that extends upward from a portion of the paper feed passage 6 on the downstream side of the paper feed path 6 and supports an edge of the paper sheet 2 on the leading end side in the transport direction. A paper sheet passage gate 10 for passing the paper sheet 2 is formed in the vicinity of a position where the extension surface intersects, and a downstream side of the paper sheet passage gate 10 forms a pair to prevent double feeding of the paper sheet 2. Separation roller 11,
12 are provided. Further, on both sides of the paper sheet storage unit 1, both sides of a weight 13 which is a paper sheet pressing means for pressing the uppermost surface of the stacked paper sheets 2 downward are held so as to be vertically movable.

Next, the paper sheet stacking plate 1 having a plurality of openings 14, 15, 16 through which the rollers 3, 4, 5 are projected.
7 are arranged along the paper feed path 6. The paper sheet loading plate 17 has an area covering the opening 8 formed in the base 7, and both sides on the rear side thereof are vertically rotatably held on both sides of the opening 8 via a support shaft 18. There is. Further, a concave portion 19 that supports the peripheral edge of the sheet placement plate 17 is formed at the peripheral edge of the opening 8 of the base 7. As shown in FIG. 1C, the depth a of the recess 19 is smaller than the plate thickness t of the paper sheet stacking plate 17. As a result, the upper surface of the sheet placement plate 17 is designed to be higher than the upper surface of the base 7 by b, that is, (ta).

Further, when the paper sheet 2 is stored in the paper sheet storage unit 1, the paper sheet placement plate 17 is moved to a position at least approximately the same level as the apexes of the rollers 3, 4, and 5 and the paper sheet passage. A solenoid 20, which is a mounting plate elevating means for elevating the gate 10 to the upper part, is provided. That is, the plunger 21 of the solenoid 20 and the paper sheet loading plate 17 are connected to each other via the link 22 at a position separated from the support shaft 18 by a predetermined distance.

In such a structure, the solenoid 20 is maintained in a non-excited state during sheet feeding. In this state, as shown in FIG. 1B, since the protruding length of the plunger 21 is short, the sheet stacking plate 17 is maintained in a state of being supported by the recess 19 of the base 7. That is, the paper sheet mounting plate 1
7 is lowered to the paper feed path 6, and the rollers 3, 4, 5 project upward from the openings 14, 15, 16 of the paper sheet loading plate 17 and come into contact with the lowermost paper sheet 2. In this state, the paper feed roller 3
Is rotated by a motor (not shown), the lowermost paper sheet 2 is fed into the paper sheet passage gate 10. When a plurality of sheets 2 are sent to the sheet passage gate 10, they are separated and supplied one by one by the separation rollers 11 and 12. In this case, the leading edge of the paper sheet 2 rides on the base 7 from the leading edge of the paper sheet loading plate 17 on the paper sheet passage gate 10 side, but as shown in FIG. Since the platen 17 is higher by a height of b, the tip of the paper sheet 2 sent in the direction of arrow A (direction toward the paper sheet passage gate 10) does not get caught on the base 7 and smoothly slides, and jams occur. It never happens.

Further, when it is detected that the paper sheet 2 in the paper sheet storage section 1 is gone and the paper sheet 2 is replenished, the solenoid 20 is excited by operating a key (not shown). That is, as shown in FIG.
1 protrudes upward, so that the sheet stacking plate 17 moves the rollers 4,
It rises to a height which almost coincides with the top of the sheet 5 and reaches the upper portion of the sheet passage gate 10. In this case, the paper sheet loading plate 1
7 rotates about a spindle 18 as a fulcrum, and the paper sheet stacking plate 1
Since the radius of the shaft 7 of the paper sheet stacking plate 17 facing the paper feed roller 3 is larger than the radius of the shaft 18 facing the paper feed roller 3, the part of the paper sheet stacking plate 17 facing the paper feed roller 3 has a larger radius. Ascend to a position higher than the top of 3.
As a result, when the paper sheet 2 is stored in the paper sheet placing plate 17 from the auxiliary roller 5 side toward the paper sheet passage gate 10 side, the leading edge of the paper sheet 2 receives resistance from the rollers 3, 4, 5. In addition, it is possible to prevent the invasion into the paper sheet passage gate 10 by the paper sheet placing plate 17 located at the elevated position. Therefore, the leading edge of the paper sheet 2 on the conveying direction side is not bent, and the occurrence of jam can be effectively prevented. Moreover, the conventional stopper 110 (see FIG. 4) can be omitted in order to prevent the paper sheet 2 from entering the paper sheet passage gate 10.

In the above-described embodiment, since the paper sheet loading plate 17 rotates about the support shaft 18, the paper sheet placing plate 17 inclines upward toward the paper sheet passage gate 10 side, but is linear so as to always maintain a horizontal posture. You may make it elevate and lower. Also,
The stacking plate elevating means for lifting the paper stacking plate 17 is not limited to the solenoid 20, and may be lifted by a motor or a cam or lever that is manually rotated.

[0015]

According to the present invention, since the sheet placing plate can be lowered to the sheet feeding path at the time of sheet feeding, the rollers including the sheet feeding roller are moved upward from the opening of the sheet placing plate. The paper sheet in the lowermost layer can be projected and brought into contact with it, and the paper sheet in the lowermost layer can be sent to the paper sheet passage gate by rotating the paper feed roller. Since the placing plate can be raised by the placing plate elevating means, the leading edge of the paper sheet does not receive resistance from the roller, and
Since the invasion of the paper leaves of the paper passage gate can be prevented by the paper sheet placing plate located in the raised position, the structure for preventing the invasion of the paper sheets to the paper passage gate at the time of paper supply is simplified. can do.

[Brief description of drawings]

1A and 1B show an embodiment of the present invention, in which FIG. 1A is a vertical sectional side view showing an empty paper sheet storage unit, and FIG. 1B is a vertical sectional side view showing a paper sheet storage unit storing paper sheets; (C) is a vertical side view showing a part of the base and the paper sheet mounting plate.

FIG. 2 is an exploded perspective view showing a conventional paper sheet storage unit and a paper sheet formed in a part of the housing of the printer.

FIG. 3 is a perspective view showing details of the paper sheet storage unit in FIG.

FIG. 4 is a vertical cross-sectional side view showing the inside of the paper sheet storage unit of FIG.

[Explanation of symbols]

 1 Paper Sheet Storage Section 2 Paper Sheet 3 Paper Feed Roller, Roller 4, 5 Roller 6 Paper Feed Path 9 Partition Plate 10 Paper Leaf Passage Gate 13 Paper Leaf Holding Means 14 to 16 Opening 17 Paper Leaf Placement Plate 20 Placement Plate Lifting means

Claims (1)

[Claims] 1. A paper sheet storage part for storing a large number of stacked paper sheets, and at least a paper feed part of which an outer periphery is projected upward from a paper feed path which is the lowermost surface of the paper sheet storage part. A roller including a roller, a partition plate that extends upward from a portion of the paper feed passage that is on the downstream side of the roller, and supports an edge of the paper sheet on the leading end side in the transport direction, the paper feed passage, and the paper feed passage. A sheet passing gate formed in the vicinity of a position where the extension surface of the partition plate intersects, and an opening for projecting the roller are arranged along the sheet feeding passage and are arranged above the sheet feeding passage. A sheet placement plate movably provided to the sheet placement sheet, sheet sheet holding means for pushing down the uppermost surface of the sheet sheets stacked on the sheet sheet placement plate, and the sheet sheet in the sheet sheet storage section. At the time of storing, the paper sheet loading plate is at least at a position substantially at the same level as the apex of the roller, and A sheet feeding device comprising: a mounting plate elevating means for elevating to an upper portion of a sheet passing gate.