JPH02305727A - Paper feed device - Google Patents

Abstract

PURPOSE:To manipulate a sheet without injuring its surface by providing a pressure roller, which is movable to a pressure position and a release position, inside a paper feed belt. CONSTITUTION:The highest one only among sheets S is fed separately by pressing a part of the sheets S against a paper feed belt 1 through a sheet pressure means 20 and, at the same time, by pressing a paper feed belt 1 against a handling roller 7 through a pressure member 8 provided inside the paper feed belt 1. Then, one sheet only is fed, and, after that, the pressure due to the pressure member 8 and the sheet pressure means 20 are released. Consequently, any sheet can be carried in such a slate that the paper feed belt 1 is not pressed against the handling roller 7. Therefore, any defects due to the handling roller 7 on the printing surface of a sheet can be prevented by keeping a center distance between the handling roller 7 and a pulley 4 specified.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to recording paper conveyance in a hard copy device, and more particularly to an automatic paper feeding device for sheets cut to a certain length.

(Prior Art) Conventionally, in an automatic paper feeder compatible with a removable cassette, there is one that separates recording paper using a sheet and a cutting roller that utilizes the sliding of the sheet.

A pick-up roller takes out the sheet in the cassette and sends it to conveyance rollers and a sabaki roller that are placed in contact with each other at the top and bottom. The conveyance roller was rotated in the conveyance direction, and the sabaki roller was rotated in the direction to return the sheet to the paper feed cassette, and the sheet was divided into one sheet and fed.

Furthermore, in Japanese Patent Application Laid-Open No. 62-136444, a sabaki roller for separating sheets into one sheet is made movable and can be placed in a state in which it is pressed against the paper feed roller, and in a state in which the pressure is released.
Paper feeders have been proposed that are configured to move between two states.

(Problems to be Solved by the Invention) However, among image forming devices, sheets used in sublimation thermal transfer printers in particular have their surfaces coated with polyester. Therefore, in a paper feeding mechanism that uses the above-mentioned sabaki roller to prevent double feeding for such special paper, the sabaki roller rotates in the opposite direction to the paper advancing direction, which tends to damage the surface of the sheet. There is a problem.

In addition, as mentioned above, the Sabaki roller is made movable,
A device that does not rub the entire surface of the sheet has been proposed, but the device would be complicated and large if it had a drive source to be movable.

The present invention has been made in view of these points.

(Means for solving the problem) In the present invention, in order to solve the above problem, a press roller movable between a press position and a press release position is provided inside the paper feed belt.

(Function) A part of the sheet is pressed against the paper feed belt by the sheet suppressing means, and the paper feed belt and the sabaki roller are pressed into contact with each other by the suppressing member provided inside the paper feed belt, thereby suppressing the sheet. Separate and feed only the topmost sheet. Only one sheet is fed, and the pressing by the pressing member and the pressing by the sheet suppressing means are released. Therefore, the sheet is conveyed in a state where the paper feed belt and the cutting roller are not in pressure contact with each other.

(Example) Hereinafter, the present invention will be described in detail based on the drawings.

FIG. 1 is a schematic side view showing the overall configuration of an automatic paper feeder according to the present invention, which is composed of a paper feed conveyance section A and a sheet holding section B.

The paper feed conveyance unit A includes two large-diameter pulleys 2.3, a paper feed belt 1 that is passed between the pulleys 2.3 and rotates in the direction of arrow R1, and two small-diameter pulleys 4 and 5. The conveyor belt 6 rotates in the direction of arrow R2, which is placed on the lower right side of the paper feed belt 1 so as to be in horizontal contact with the paper feed belt 1, and There is a saba kilo-rough in pressure contact with the belt 6 and facing the paper feed belt 1, and there is a saba kiro-rough inside the paper feed belt 1 at a position opposite to the saba kiro-rough with the paper feed heald 1 in between, and the paper feed belt 1 and the saba kilo are in contact with each other. - A pressing roller 8 for pressing the rough into a pressed state is the main component. The pulley 2.
3, 4.5 are each driven by a drive source (not shown). It is provided with a coil spring 14 wound around a support shaft 26 that biases the Sabaki Rough so that it is always in pressure contact with the conveyor belt 6. This second Saba Kirahu is driven by the conveyor belt 6. The pressure roller 8 in the paper feed belt 1 is rotatably held at the tip of a lever 9 that swings in an inverted shape about a support shaft 10 . On the other hand, a wire 17 is connected to the other end of the lever 9 that is bent at right angles and extends downward, and is connected to a solenoid (not shown) in the drive section 12 .

Then, the lever 9 swings to a pressing position in which the pressing roller 8 presses the paper feed belt 1 to a position relative to the lower side of the paper rough. Furthermore, the drive part! A spring 13 is provided at the same end of the lever 9 as the wire I7 so that the pressure roller 8 takes the pressure release position when the pressure roller 2 is not ONI. Further, a stopper 11 is provided to prevent the lever 9 from swinging too much due to the spring 13. It is assumed that the pressing force between the paper feed belt 1 and the mackerel rough due to the pressing force of the pressing roller 8 is smaller than the pressing force between the conveyor belt 6 and the mackerel rough.

The sheet holding section B is configured as follows. A paper feed cassette +5 is arranged horizontally on the left side of the Sabaki rough. The paper feed cassette 15 has a notch in its bottom plate 15a into which a paper feed pressing member 20 (described later) is inserted, and a paper feed plate 16 is provided at the bottom, and the sheets S are stacked on the paper feed plate 16 and inserted. has been done. The right end of the paper feed pressing member 20, which is wound around the support shaft 19 and rotatably supported, comes into contact with the lower right side of the bottom paper feed plate 16, and as shown in FIG. It is configured to lift the right side. A groove is provided on the periphery of the fan-shaped portion of the fan-shaped rotary plate 21 integral with the paper feed pressure contact member 20, and a horizontal right direction fixed to this end and passed through the groove. Since the wire 18 extending to is connected to the solenoid of the drive section 12 via the spring 23, the above-mentioned lifting of the paper feed plate 16 is performed by pulling the wire 18 to the right. On the other hand, the rotating plate 2I
A coil spring 22 wound around the shaft 25 of the support frame 24 is applied, and when the solenoid of the drive unit 12 is turned off, the rotary plate 21 is rotated to the right and returned to the initial state shown in FIG. The sheet pressing means is configured.

Next, the operation of the paper feeding device configured as above will be explained. First, a power supply (not shown) is turned on, the CPU of the drive device is turned on, initial settings are made, and a paper feeding routine for carrying out a paper feeding operation is set. Subsequently, a solenoid for swinging the paper feed plate 16 (not shown) in the drive unit 12 is turned on, and the wire 18 is pulled to the right to bring the right end of the sheet S into contact with the paper feed belt 1 as shown in FIG. Push up.

At the same time as the push-up operation, the solenoid for the pressure roller 8 (not shown) in the drive unit 12 is turned on and the wire 17 is pulled to the right. 8 is swung downward and pressed against the paper feed belt 1 so that the paper feed belt 1 and the mackerel rough are in pressure contact with each other.

Subsequently, the drive sources for driving the pulleys 2.3 and 4.5 are turned on, and the paper feed belt 1 and the conveyance belt 6 are rotated in the directions of arrows R, , R in the figure, respectively. Since the mackerel rough is urged by the coil spring 14 and is in pressure contact with the conveyor belt 6, as the conveyor belt 6 rotates, the arrow R1 in the figure
Rotate in the direction. The above operation is performed to feed the uppermost sheet S in the cassette 15 to the right in the figure.

At this time, the pressure by the pressure roller 8 is set in advance in an internal timer for a predetermined period of time until the fed sheet is nipped between the conveyor belt 6 and the paper feed belt 1 provided on the downstream side of the mackerel rough. put. A timer is started with the rotation of the paper feed belt 1, and after a predetermined period of time, the solenoids of the drive unit 12 are turned off, and the pressure roller 8 presses the paper feed bell l1 and the paper feed pressing member 2.
0 to release the contact between the sheet S and the paper feed belt l.

The sheets S loaded on the paper feed plate 16 are pushed to the bottom plate 1 by their own weight.
5a and the solenoid is turned off, the Sabaki Rough continues to rotate, so that the second and subsequent sheets S are returned to the paper feed cassette 15 according to the Sabaki Rough, as shown in FIG. Furthermore, the topmost sheet S to be fed is transported without any scratches on the surface of the sheet caused by the shaving roller.

Further, as shown in FIG. 4, if the distance between the center of the Sabaki rough and the pulley 4 is M, the printed part of the sheet S is P, and the length from the tip of the sheet S to the printed part P is L, By setting M so that L≧M, the sheet can be sorted in the non-printing area of the sheet.

Furthermore, in this embodiment, by making the paper feed belt 1 long, the paper feed belt 1 can also be used as a conveyance belt, and the paper can be conveyed without the need for a sheet conveyance guide plate. No paper jams will occur.

Furthermore, since the sabaki rough is brought into contact with the conveyor belt 6 to be driven, a drive mechanism for driving the sabaki roller is not required, resulting in space saving and cost reduction. Furthermore, since the distance between the axes of the cutting roller and the paper conveyance pulley can be made the shortest, it is possible to separate the sheets at their edges.

Further, as the pressing member, although the pressing roller 8 is used in this embodiment, any material may be used as long as it has low resistance to the rotation of the paper feed belt. In this embodiment, the conveyor belt 6 was used to convey the material downstream of the saba-kilough rough, but rollers may be used instead. Furthermore, although a solenoid is used as a drive source for the drive unit 12, a motor may be used to drive the paper feed pressure contact member and/or the pressure roller.

Further, in this embodiment, the pressure roller is provided at a position facing the sabaki roller, but it is not limited to this position, and may be placed at a position where the paper feed belt and the sabaki roller can be in a pressed state and a pressed state. Alternatively, a plurality of suppressing members may be used to change the state between the pressed state and the released state.

Further, in this embodiment, a sabbling roller is used as the sabbling means, but a sabbling plate may also be used.

(Effects of the Invention) As explained above, in the paper feeding device of the present invention, by releasing the pressing force of the separating section with a simple configuration, the sheet can be separated into one sheet, and the printed section on the surface can be freed from scratches caused by the cutting roller. can be prevented from sticking. In addition, the paper feed belt can also be used to transport paper, and by synchronizing the suppression and release by the pressing member with the pressing and release of the sheet to the paper feed belt, the second and subsequent sheets are returned to the sheet holding unit. be able to.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing an embodiment of a paper feeding device according to the present invention, FIG. 2 is a diagram showing the paper feeding state of the device, FIG. 3 is a diagram showing when the paper feeding state is released, and FIG. 4 2 is a diagram showing the length of the portion held between the Sabaki roller, the paper feed belt, and the conveyance belt, and the length from the leading end of the sheet S to the printing section. 1: Paper feed held, 6: Conveyance belt, 7: Sabaki roller,
8: Press roller, 9 levers, 15: Paper feed cassette, 1
6: paper feed plate, 20: paper feed pressure contact member, S: sheet.

Claims (1)

[Claims] 1. A paper feed belt that transports sheets in a predetermined transport direction;
A separating means for preventing sheets from being conveyed in the sheet conveying direction in order to sort the sheets, a sheet holding member for holding a plurality of sheets, and a sheet holding member for feeding the sheets in the sheet holding member. A sheet feeding device having a sheet pressing means consisting of a feeding plate that presses and releases pressure on the sheet feeding belt, which is movable between a pressing position where the sheet feeding belt is pressed inside the sheet feeding belt and a pressing release position. 1. A paper feeding device comprising: a pressing member, wherein the pressing of the pressing member causes the paper feeding belt and the cutting means to come into pressure contact with each other. 2. A claim characterized in that the timing of pressing the sheet against the sheet feeding belt by the sheet pressing means and releasing the pressing is synchronized with the timing of pressing the sheet feeding belt by the pressing member and releasing the pressing. The paper feeding device according to item 1.