JPH0213397Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention is used in copying machines, facsimile machines, etc., to process multiple originals stacked on a document table into a single sheet.
This invention relates to an automatic paper feeding device that feeds paper into the main body one by one.

Conventional configurations and their problems In recent years, from the viewpoint of providing products that are easy to use for users, facsimile machines and the like that are equipped with automatic paper feeders have become popular. There are roughly two types of automatic paper feeder systems.
One is a one-sided sorting method that combines a sorting piece and a paper feed roller, and the other is a torque limit method that combines a paper feed roller, a reversing roller, and a torque limiter. The torque limit method is more popular because its ability to discriminate between one sheet and the other is more accurate.

A conventional torque limit type automatic paper feeder will be described below. FIG. 1 is a schematic side view of a conventional automatic paper feeder, in which 1 is a document table, 2 is a paper feed roller, 3 is a reversing roller, and 5 is a torque limiter. Reference numeral 4 denotes an axis of the reversing roller 3, and is rotatably coupled to the reversing roller 3. 6 is a paper guide plate, and 7 is a manuscript.

The operation of the automatic paper feeder configured as described above will be described below. First, a plurality of originals 7 are placed on the original table 1 provided with a predetermined inclination. Next, when this automatic paper feeder is started, the paper feed roller 2 rotates in the direction of arrow A.
Torque limiter 5 rotates in the direction of arrow C. When the torque limiter 5 rotates, the reversing roller 3 in contact with the torque limiter 5 also rotates in the direction of arrow B, but when the torque required to rotate the reversing roller 3 is large, the torque limiter 5 idles. That is, paper feed roller 2
When the document 7 is not interposed between the paper feed roller 2 and the reversing roller 3, or when only one document is interposed, the rotational force transmitted from the paper feed roller 2 to the reversing roller 3 is transmitted from the torque limiter 5 to the reversing roller 3. Since the rotational force is larger than the rotational force caused by
Rotate in the opposite direction. Conversely, when a plurality of documents 7 are interposed between the paper feed roller 2 and the reversing roller 3, the rotational force transmitted from the reversing roller 3 to the paper feeding roller 2 becomes larger, so that the reversing roller 3 Rotate in the direction of arrow B. As a result, among the plurality of originals interposed between the paper feed roller 2 and the reversing roller 3, the originals other than the lowest layer paper are fed by the reversing roller 3 in the direction opposite to the arrow D direction, and the lowest layer paper Only the paper is fed in the direction of arrow D. As described above, this automatic paper feeder automatically feeds a plurality of originals 7 stacked on the document table 1 one sheet at a time, starting from the lowest layer of paper, and is user-friendly. .

However, in the conventional configuration described above, since the paper feed roller 2 and the reversing roller 3 are provided inside the cabinet (not shown), the document is set before the leading edge of the document 7 reaches the paper feed roller 3. The leading edge of the second and subsequent documents may not touch the paper feed roller 2 due to large frictional resistance between the document table 1 and the document 7, or because static electricity is generated and the document 7 sticks to the document table 1. This has resulted in the problem that the automatic sheet feeding operation is not performed from the first sheet onward, or the automatic sheet feeding operation is stopped midway through.

Purpose of the invention This invention solves the above-mentioned conventional problems.
To provide an automatic paper feeder which allows a document to be easily set and prevents the automatic paper feed operation from stopping with the document remaining.

Structure of the invention The present invention comprises a first paper feed roller, a reversing roller in contact with the first paper feeding roller, a torque limit means provided in the drive transmission system of the reversing roller, and a torque limiter provided on the paper feeding side of the first paper feeding roller. a second paper feed roller provided on the second paper feed roller, a driven roller provided so as to be able to move toward and away from the second paper feed roller, and a lifting means for separating or contacting the driven roller with respect to the second paper feed roller. , a paper sheet presence/absence detection means for detecting that a paper sheet is interposed between the first paper feed roller and the reversing roller; and a control means for inputting the output of the paper sheet presence/absence detection means to control the elevating means. an automatic paper feeding device, wherein the control means controls the elevating means to isolate the driven roller from the second paper feeding roller when on standby and when the paper sheet presence/absence detecting means is detecting a paper sheet; According to
This allows the document to be easily set and prevents the automatic paper feeding operation from stopping with the document remaining.

DESCRIPTION OF EMBODIMENTS FIG. 2 is a schematic side view of an automatic paper feeder according to an embodiment of the present invention, and FIG. 3 is a schematic plan view thereof. In FIG. 2 and FIG. 3, the same members are given the same reference numerals. In Figure 2, 1
0 is a document, and 11 is a document table. 12 is a first paper feed roller, and 13 is a rotating shaft of the first paper feed roller, both of which are fixed. 14 is a reversing roller, 15 is a transmission roller, 1
6 is a rotating shaft of the reversing roller 14. The reversing roller 14 is rotatable with respect to the rotation shaft 16, and the transmission roller 15 is fixed to the rotation shaft 16. 17
is a transmission roller, and 18 is a rotating shaft to which the transmission roller 17 is fixedly attached. 19 is transmission roller 1
It is an arm for bringing pressure contact between 5 and 17, and is provided rotatably with respect to the rotating shafts 16 and 18. As a result, the reverse rotation roller 14
It will be in contact with 2 with its own weight. 20 is a second paper feed roller, 21 is a second paper feed roller 20
It is a rotating shaft with a fixedly attached. 22 is a driven roller, and 23 is a rotation shaft of the driven roller 22, which is rotatable relative to the driven roller 22. 24 is a shaft, and 25 is an arm provided rotatably with the shafts 23 and 24.

26 is a drive motor, 27 is a first and second
This is a transmission belt for interlocking the paper feed rollers 12, 20 and the drive motor 26. 28 is the rotation axis 1
3, the rotational force of the motor 26 is transmitted to the roller 1.
It is a crossed transmission belt for transmitting to 7. 2
9 is a sensor for detecting the presence or absence of a paper leaf;
A solenoid 30 serves as a means for isolating the driven roller 22 from or in contact with the second paper feed roller 20. 31 is a wire connecting the solenoid 30 and the arm 25, and 32 is a control circuit that controls the operation of the solenoid 30. Note that 33 is a paper guide plate.

Next, in FIG. 3, 34 to 37 are friction plates, and 38 is a coil spring. Friction plates 34-37
The transmission roller 15 is free in the length direction of the rotating shaft 16, but rotates simultaneously with the rotating shaft 16. Incidentally, the friction plates 34 to 37 and the coil spring 38 constitute a torque limit means. Note that the solenoid 30 and wire 31 are omitted in FIG.

The operation of the automatic paper feeder of this embodiment configured as described above will be described below.

First, the state before this automatic paper feeder operates,
That is, during standby, the control circuit 32 operates the solenoid 30. In other words, the solenoid 30 pulls the wire 31 and the rotating arm 25 rotates in the direction of the arrow E around the shaft 24, so that the driven roller 22 is largely separated from the second paper feed roller 20. There is.

Next, a plurality of originals 10 are stacked on the original table 11. In this case, there is no need to place the original 10 and push it deeply until the leading edge of the original 10 reaches the paper feed roller 12.
From the contact position 39 when the
It is sufficient if it exceeds the paper feeding direction indicated by .

And a start button (not shown) attached to a facsimile machine etc. equipped with this automatic paper feeder.
When is pressed, this automatic paper feeder also changes from a standby state to an operating state. Then, the drive motor 26 rotates, and the first and second paper feed rollers 12 and 20 and the transmission roller 17 also rotate. At the same time, the control circuit 32 stops the operation of the solenoid 30, so that the driven roller 22 contacts the second paper feed roller through the plurality of documents 10 under its own weight. Then, the plurality of originals 10 are fed in the direction of arrow F by the rotational force of the second paper feed roller 20.

Then, when the leading edges of the plurality of originals 10 come into contact with the paper feed roller 12 or the reversing roller 14, the paper feeding roller 12 and the reversing roller 14 automatically select only the bottom layer of paper by the same operation as in the past. and feed the paper into the main unit. Subsequently, when the sensor 29 detects the fed document 10, it changes its own output signal, and the control circuit 32 detects this and operates the solenoid 30. Then, the driven roller 22 is largely separated from the second paper feed roller 20. At this time, the second and subsequent documents from the bottom layer 10
Since the documents 10 are free from the first paper feed roller 12 and the reversing roller 14, they can be taken out freely, and the documents 10 can be added or deleted by changing the schedule.

When the first document 10 is completely fed, the output signal of the sensor 29 changes from the document present state to the document absent state. Detecting this change,
The control circuit 32 stops the operation of the solenoid 30 and brings the driven roller 22 into contact with the second paper feed roller 20 via the plurality of documents 10 again. As a result, the plurality of originals 10 are fed again toward the first paper feed roller 12, and the second paper is fed. below,
Similar operations are repeated until the original 10 is exhausted.

As described above, according to this embodiment, on the paper feeding side of the automatic paper feeding roller pair consisting of the first paper feeding roller and the reversing roller, there is a second paper feeding roller, and a second paper feeding roller and an automatic paper feeding roller pair on the standby and automatic paper feeding roller pairs. If there is a manuscript between
By providing a driven roller that is isolated from the paper feed roller, the document 10 can be easily set.
Furthermore, the leading edge of the second and subsequent documents 10 can be ensured to reach the pair of automatic paper feed rollers, and it is possible to prevent the automatic paper feeding operation from stopping with the document remaining.

Next, other embodiments of the present invention will be described with reference to the drawings.

FIG. 4 is a partially omitted schematic side view of an automatic paper feeder according to another embodiment of the present invention. In FIG. 4, the same parts as in FIG. 2 are given the same reference numerals. Reference numeral 40 denotes a stop member for preventing the document 10 from falling, which is provided at the end of the document table 11 that is inclined in the negative direction. The distance L between the contact position 39 between the driven roller 22 and the second paper feed roller 20 and the mounting position of the stop member 40 is set to be shorter than the length of the document 10. The operation will be explained below. In this embodiment as well, the automatic paper feeding operation by the first paper feeding roller 12 and the reversing roller 14 and the isolation and contacting operations of the driven roller 22 with respect to the second paper feeding roller 20 are the same as in the previous embodiment.

On the other hand, when the first document 10 is fed by the first paper feed roller 12 and the reversing roller 14, the driven roller 22 is largely separated from the second paper feed roller 20. Then, the second and subsequent documents 10 fall along the slope of the document table 11, but in this embodiment, the stopping member 40 is provided, so the document 10 does not completely fall off the document table 11, and the document 10 is stopped in a state in which the rear end thereof is in contact with the stop member 40. At this time, the leading edge of the document 10 is located on the paper feeding side from the contact position 39 between the second paper feed roller 20 and the driven roller 22, so when feeding the second sheet, the second paper feed roller 20 and the driven roller 22, the document 1 is
0 is fed, the leading edge of the original 10 reaches the pair of automatic paper feed rollers, and the second sheet can be fed.

As described above, according to this embodiment, the stopping member 40 for the original 10 is provided at a position where the distance L on the original table 11 is shorter than the length of the original 10, so that the original table 11 is tilted in the negative direction. Automatic paper feeding operation can be performed even if the

Note that in the above embodiment, the driven roller 22 is
Although the timing for contacting the paper feed roller 20 has been described as when the start button (not shown) is pressed or when the sensor 29 detects the absence of the document 10, the present invention is not limited to these. isn't it. That is, instead of the activation button, a sensor that detects that a document is stacked on the document table may be used, and instead of the sensor 29, a sensor that detects when a document is stacked on the document table may be used. The timing of existing sensors and control circuits may be used.

Furthermore, in connection with a device equipped with this automatic paper feeder, it is extremely easy for a person skilled in the art to appropriately provide a clutch in the transmission system of the rotational force of the drive motor 26 and control the operation of the rollers. be.

Effects of the invention The present invention provides an arrangement in which documents are placed between the second paper feed roller and the automatic paper feed roller pair during standby and automatic paper feed rollers in the reverse paper feeding direction of the automatic paper feed roller pair consisting of the first paper feed roller and the reversing roller. By providing a driven roller that is isolated from the second paper feed roller when the second paper feed roller is present, the document can be easily set and the automatic paper feed operation can be prevented from stopping with the document remaining. can. In addition, by providing a document stopper on the document table, automatic paper feeding can be achieved even if the document table is tilted in a negative direction. It is possible to realize a device.

[Brief explanation of drawings]

Fig. 1 is a schematic side view of a conventional automatic paper feeder, Fig. 2 is a schematic side view of an automatic paper feeder according to an embodiment of the present invention, Fig. 3 is a plan view thereof, and Fig. 4 is a schematic side view of an automatic paper feeder according to an embodiment of the present invention. FIG. 7 is a schematic side view of an automatic paper feeder in another embodiment. 10...Original, 11...Original table, 12...First
Paper feed roller, 14... Reverse roller, 20... Second paper feed roller, 22... Driven roller, 29...
Sensor, 30... Solenoid, 32... Control circuit, 40... Stop member.

Claims (1)

[Claims for Utility Model Registration] A driving means 26, a first paper feed roller 12 that comes into contact with the lower surface of the paper sheet and feeds the paper by the driving force of the driving means 26, and torque limiters 34, 35, 36, 37. ,38
A reversing roller 14 is applied with a driving force from the first paper feed roller 12 via
a second paper feed roller 20 that is provided upstream of the first paper feed roller 12 in the paper feeding direction and feeds the stacked paper sheets by the driving force; A rotatable driven roller 22 is provided to the paper feed roller 20 of the second paper feed roller 2 via the stacked paper sheets, and this driven roller 22 is connected to the second paper feed roller 2
elevating means 30 for driving the rotary arm 25 so as to be isolated from or in contact with zero; and paper sheet presence/absence detection means for detecting a sheet interposed between the first sheet feeding roller 12 and the reversing roller 14. 29; and a control means 32 for controlling the isolating operation of the elevating means 30 during standby and in response to detection by the sheet presence/absence detecting means 29.