JPH0522425U - Paper feeder - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to always obtain the optimum retraction force for various types of paper, and to reliably separate and recharge the paper one by one. [Structure] Paper feed tray 12 for stacking and supporting original sheets P
Further, there are provided a take-in roller 9 for giving a take-up force to the original paper P on the paper feed tray 12, and a separation pad 11 for giving a force against the take-up force to the original paper P on the paper feed tray 12. Then, the take-in roller 9 and the separation pad 11
The original paper P on the paper feed tray 12 is separated one by one and fed into the conveyance path 4 in cooperation with.
The paper feed tray 12 is rotatably supported at its lower end by the shaft 9a of the take-in roller 9, and the angle of the paper feed tray 12 can be changed and adjusted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a document sheet feeding device in a facsimile machine, for example.

[0002]

[Prior Art]

 In most of the original document feeders, a support base for stacking and supporting originals is arranged on the upper surface of the apparatus frame in an inclined state.

Then, a retracting roller arranged near the lower end of the supporting table applies a retracting force to the original document on the supporting table. On the other hand, the separation pad provides a force against the retraction force to the original document on the support table. Therefore, when the take-in roller rotates, one of the originals on the support table, which is in contact with the take-up roller, is taken up by the reading section in the apparatus, but the other originals are placed on the support table by the separation pad. The position is retained. Then, when the feeding of one original is completed and the next original comes into contact with the feeding roller, the original is fed. As described above, the documents on the support table are fed one by one.

[0004]

[Problems to be solved by the device]

 In this case, the original paper has various thicknesses and paper qualities, and if the thicknesses and paper qualities differ, the state in which the original is fed changes. For example, if the manuscript is thick or is not slippery, it will be difficult to feed it in, and it will not go in smoothly. On the other hand, if the original is thin or slippery, it will be easier to pick up and the pick up will be smooth. However, since the revolving conditions such as the revolving speed of the revolving roller and the friction coefficient of the separation pad are constant, sometimes there are problems in which multiple documents are fed in simultaneously or not.

An object of the present invention is to solve the above problems and to provide a sheet feeding device that can always reliably feed sheets one by one.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, in the present invention, a support base for stacking and supporting sheets of paper, a take-up roller provided near one end of the support stand, and a separation pad arranged so as to face the take-up roller. In the sheet feeding device having the above-mentioned feeding roller and the separation pad so that the sheets on the supporting table can be fed one by one, the angle of the supporting table can be changed. ..

[0007]

[Action]

 Therefore, according to the present invention, when the paper is thin or slippery, if the angle of the support base is made smaller with respect to the horizontal plane, the retraction force for the paper becomes smaller, but Since the ability to separate sheets one by one becomes higher, it is possible to prevent sheets from being fed in at the same time, and it is possible to reliably separate and feed sheets one by one. Also, if the paper is thick or difficult to slip, increasing the angle of the support table with respect to the horizontal plane will increase the retraction force for the paper, so the paper will not roll in. Will disappear.

[0008]

【Example】

 An embodiment in which the sheet feeding device of the present invention is embodied as a document sheet feeding device in a facsimile machine will be described below with reference to the drawings.

As shown in FIG. 1, an original paper P insertion slot 2 is formed on the upper surface of the apparatus frame 1, and an original paper P discharge port 3 is formed on the front edge of the apparatus frame 1. A conveyance path 4 for the document sheet P is provided inside the apparatus frame 1, and the document sheet P inserted from the insertion port 2 passes through the conveyance path 4 and is discharged from the discharge port 3. Further, a paper discharge tray 5 is arranged at a position corresponding to the discharge port 3 on the front edge of the apparatus frame 1, and the original paper P discharged from the discharge port 3 is placed on the paper discharge tray 5. ..

The image sensor 6 is arranged so as to face the conveyance path 4, and the image information on the original paper P is read by the image sensor 6 during transmission. A pair of feed rollers 7 and 8 are respectively arranged on the upstream side and the downstream side of the conveying path 4 with the image sensor 6 interposed therebetween, and the rotation of these feeding rollers 7 and 8 causes the original material to pass through the conveying path 4. A feed is added to the draft paper P.

The take-in roller 9 is rotatably supported in the apparatus frame 1 in the vicinity of the insertion port 2, and an internal plate 10 is arranged at a position opposite to the take-in roller 9 with the conveying passage 4 interposed therebetween. There is. A separation pad 11 is attached to the guide plate 10 so as to face the retraction roller 9, and the separation pad 11 is always directed toward the retraction roller 9 by a spring means (not shown) so as to come into contact with the outer peripheral surface of the retraction roller 9. Being energized.

A paper feed tray 12 as a support table for stacking and supporting the original paper P is rotatably supported at one end thereof by a shaft 9 a of the feeding roller 9, and is provided above the apparatus frame 1 from the insertion opening 2. It projects in an inclined state. Then, when the feeding roller 9 is rotationally driven in a state where a large number of original sheets P are stacked and supported on the sheet feeding tray 12, among the original sheets P on the sheet feeding tray 12, the outer peripheral surface of the feeding roller 9 is A pull-in force is applied only to the one original sheet P that is in contact with the original sheet P, and the original sheet P is pulled into the conveying path 4. At this time, the other original paper P is prevented from being taken into the transport passage 4 by the separation pad 11, and is held at the position on the paper feed tray 12. In other words, as the take-up roller 9 rotates, the original paper P on the paper feed tray 12 is separated one by one by the cooperation of the take-up roller 9 and the separation pad 11, and is taken into the conveyance path 4. ..

Next, the mounting structure of the paper feed tray 12 will be described in detail. As shown in FIGS. 2 and 3, support legs 13 are formed on both sides of the base end of the paper feed tray 12, and the support legs 13 are supported by the support legs 13. The ends of the legs 13 are supported by shafts 9 a at both ends of the take-in roller 9. The end of one support leg 13 is formed in a circular shape, and a large number of locking teeth 14 are formed on the peripheral surface thereof.

The stopper 15 is rotatably supported in the apparatus frame 1, and has a lower end formed with a locking claw 15 a that can be engaged with the locking tooth 14. Further, the stopper 15 is urged by the action of the spring 16 in the direction in which the locking claw 15 a of the stopper 15 engages with the locking tooth 14. The engagement of the locking claws 15a and the locking teeth 14 prevents the rotation of the paper feed tray 12. The upper end of the stopper 15 projects upward from the upper surface of the device frame 1. By rotating the upper end of the stopper 15 against the urging force of the spring 16, the locking claw 15a and the locking tooth 14 are formed. The engagement with and is released, whereby the paper feed tray 12 can be freely rotated and the angle of the tray 12 can be adjusted.

In the document sheet feeding device configured as described above, if the document sheet P is thin or slippery, the holding force of the separation pad 11 with respect to the document sheet P is relatively large. In that case, the sheet feeding tray 12 is rotated to make the angle of the sheet feeding tray 12 smaller than the horizontal plane. Then, the force by which the original paper P 1 moves toward the inside of the transport passage 4 due to its own weight becomes small, and the progress thereof is easily blocked by the separation pad 11, that is, the ability to separate the original paper P 1 one by one becomes high. It is possible to reliably separate the original paper sheets P one by one and to feed them into the transport passage 4 without feeding a plurality of the same paper sheets P at the same time. In this case, the retraction force for the original paper P is small, but since the paper P is originally easy to be rewound, there is no problem that the paper is not rewound.

If the original paper P is thick or slip-resistant, the holding force of the separation pad 11 with respect to the original paper P becomes relatively large. The paper feed tray 12 is rotated to increase the angle with respect to the horizontal plane. Then, the force of the original paper P trying to advance into the conveyance path 4 by its own weight becomes large, and it becomes easy for the original paper P to be taken in by the take-in roller 9. It does not mean that the document sheet P 1 is not inserted and the document sheet P 1 can be reliably fed into the transport passage 4. In this case, the ability to separate the original paper sheets P one by one becomes low, but since the original paper sheets P are easily separated from each other, there is no problem that a plurality of paper sheets are simultaneously fed.

The present invention is not limited to the above-described embodiment, and the present invention is embodied in a paper feeding device other than the original paper feeding device, for example, a printer, or a rotation mechanism of the paper feeding tray 12. It is also possible to change the configuration of each part and embody it, for example, by changing the configuration of, without departing from the spirit of the invention.

[0018]

[Effect of the device]

 As described in detail above, according to the present invention, it is possible to obtain an optimum retraction force for various kinds of papers at all times, and it is possible to reliably separate and reconstitute the papers one by one, which is an excellent effect. Demonstrate.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing an embodiment in which a sheet feeding device of the present invention is embodied as a document sheet feeding device.

FIG. 2 is a partially enlarged cross-sectional view showing a rotation mechanism of a paper feed tray.

FIG. 3 is a partial front view showing a support structure for a feeding roller of a paper feed tray.

[Explanation of symbols]

9 Retracting roller, 11 Separation pad, 12 Paper feed tray as a support, 14 Locking teeth, 15 Stopper, 15a Locking claw, P Original paper.

Claims (1)

[Scope of utility model registration request] 1. A support base for stacking and supporting sheets of paper, a feeding roller provided near one end of the support base, and a separation pad arranged to face the feeding roller, and separated from the feeding roller. A sheet feeding device in which a sheet on a support table is fed one by one in cooperation with a pad, wherein the angle of the support table is changeable.