JPH028907Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic paper feeder, and more particularly to an automatic paper feeder in a facsimile machine that transports a loaded document using an auxiliary roller.

As shown in the perspective view of FIG. 1, a conventional automatic paper feeder includes a paper feed roller 1 that presses against an elastic separating member 2, an auxiliary roller 3 that rotates in conjunction with the rotation of the paper feed roller 1, It is configured to include a document detector 4 and a vertical mechanism 5 including a plunger 51, a solenoid 53, and a tension spring 54.

The paper feed roller 1 is pressed against the elastic separation member 2 and rotates in the rotation direction B, and the auxiliary roller 3 whose rotation is transmitted from the shaft 11 of the paper feed roller 1 via the belt 9 also rotates in the rotation direction C. Rotate direction.

A plurality of originals 7 stacked on the original platen 8 are transferred from the uppermost original to the pressure contact portion between the paper feed roller 1 and the separating member 2 by rotation of the auxiliary roller 3 .

At the pressure contact portion between the paper feed roller 1 and the separation member 2, the plurality of originals 7 are separated due to the difference in frictional force against the corresponding document surface that is in contact with the paper feed roller 1, the separation member 2, and the document surface, respectively. The documents are separated one by one starting from the topmost document and fed out in the paper feeding direction D.

When the document detector 4 detects that there is no document on the document table 8, the current of the solenoid 53 of the vertical mechanism 5 is cut off, and the plunger 5, which has been attracted by the solenoid 53, is turned off.
1 is lifted upward by the tensile force of the tension spring 54. A long hole 52 is bored in the plunger 51, and a pair of arms 1 that pivotally support the shaft 11 of the paper feed roller 1 and the shaft 31 of the auxiliary roller 3 are inserted into the long hole 52.
A driving pin 13 protruding from 2 is fitted.

When the plunger 51 is lifted upward, the drive pin 13 is pushed by the lower end of the elongated hole 52, the arm 12 rotates upward about the shaft 11, and the auxiliary roller 3 is lifted up.

When the next document is loaded on the document table 8 and the document detector 4 detects the presence of the document, an exciting current flows through the solenoid 53, and the plunger 51 is attracted to the solenoid 53 against the tension force of the tension spring 54, and the drive pin The upper end of the elongated hole 52 comes into contact with the arm 13, and the arm 12 rotates downward about the shaft 11. The weight of the auxiliary roller 3 and the shaft 31 is added to this movement, and the auxiliary roller 3 falls onto the document surface and presses the document with its own weight, and the auxiliary roller 3 rotates and transfers the document to the feed roller 1. It is transferred to the pressure contact part with the separation member 2.

Here, when the plunger 51 is attracted, the drive pin 13 is set away from the end of the elongated hole 52 so that the attraction force of the solenoid 53 does not act on the arm 12.

In such a conventional automatic paper feeder, when the leading edge of a loaded document is curled upward, the leading edge of the document hits the paper feed roller 1 and the paper feed roller 1
The tip of the paper may break before it reaches the pressure contact between the paper and the separation member 2, or only one side of the paper may be inserted into the pressure contact first and travel obliquely, resulting in a paper jam.

That is, the conventional automatic paper feeder has a drawback in that paper jams occur when a document with a curled leading edge is used.

An object of the present invention is to provide an automatic paper feeder that can prevent paper jams from occurring when a document with a curled leading edge is used.

The automatic paper feeder of the present invention includes a paper feed roller that presses against a separation member and feeds out multiple originals stacked on a document table one by one in the paper feeding direction starting from the top, and a rotation of the paper feed roller. an auxiliary roller that moves the document to a pressure contact portion between the separation member and the paper feed roller; a document detector that detects the presence or absence of the document on the document table; a vertical mechanism that lifts up the auxiliary roller using the axis of the paper feed roller as a fulcrum when a blank is detected; It is configured to include a plurality of tongue-like pieces whose leading end contacts the document table when there is no document.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a perspective view showing an embodiment of the present invention. The automatic paper feeding device shown in FIG.
Document detector 4, plunger 51, solenoid 5
3 and a vertical mechanism 5 comprising a tension spring 54;
It is configured to include a plurality of tongue-like pieces 6.

Below, the operation of the automatic paper feeder shown in FIG. 2 will be explained in detail with reference to FIGS. 3 and 4. 3 is a side view of section AA' in the embodiment shown in FIG. 2 when there is no document, and FIG. 4 is a side view of section AA' in the embodiment shown in FIG. 2 when there is a document.

In the following description, the operations of the paper feed roller 1, separation member 2, auxiliary roller 3, document detector 4, and up/down mechanism 5 are the same as those in the conventional example described above, and the description thereof will be omitted.

As shown in FIG. 3, if there is no original on the original platen 8, the original detector 4 detects that there is no original, and the up/down mechanism 5 lifts up the auxiliary roller 3 as described above.

The tongue-shaped piece 6 is rotatably supported by the shaft 31 of the auxiliary roller 3, and is set so that the tip thereof is inclined toward the paper feed roller 1 side and presses the document table 8 with its own weight.

Therefore, when loading a plurality of documents onto the document table 8, the tip of the tongue 6 is pushed by the tip of the document, and the tongue 6 rotates in the rotational direction C and loads while escaping. Since it works to push the top surface of the document being loaded, even if the leading edge of the document is curled upward, it can be loaded without difficulty.

As shown in FIGS. 2 and 4, when a plurality of documents 7 are loaded on the document table 8 and the document detector 4 detects the presence of documents, the vertical mechanism 5
is activated, and the auxiliary roller 3 falls onto the document surface and presses the document 7.

On the other hand, the tongue piece 6 rotatably supported on the shaft 31
rotates in the direction of rotation C while contacting the uppermost document surface of the document 7, and pushes the leading end surface of the uppermost document with the lower surface of the tongue-shaped piece 6 to flatten the document surface.

At the same time, the auxiliary roller 3 rotates in the rotational direction C, and transfers the uppermost document 7 to the pressure contact portion between the paper feed roller 1 and the separation member 2. Therefore, even if a document with a curled leading edge is used, the leading edge of the document can be reliably transferred to the pressure contact portion between the paper feed roller 1 and the separating member 2.

As explained above, although an elastic separation member is used in the embodiment of the present invention, a similar separation function can be obtained by using a return belt or a return roller that rotates in a direction opposite to the rotation of the paper feed roller.

As described above, the automatic paper feeding mechanism of the present invention adds multiple tongue-like pieces to press and flatten the leading edge of the loaded document, so that it can be used when using a document with a curled leading edge. This has the effect of preventing paper jams and ensuring reliable automatic paper feeding.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional example, Fig. 2 is a perspective view showing an embodiment of the present invention, and Fig. 3 is a side view of the AA' section in the embodiment shown in Fig. 2 when there is no document. , FIG. 4 is a side view of the section AA' in the embodiment shown in FIG. 2 when there is a document. In the figure, 1...paper feed roller, 2...separation member, 3...auxiliary roller, 4...document detector, 5...
...Upper-down mechanism, 6...tongue, 7...manuscript, 8...
Original table, 11, 31... shaft, 12... arm, 1
3... Drive pin, 51... Plunger, 52...
Long hole, 53... solenoid, 54... tension spring.

Claims (1)

[Scope of utility model registration request] A paper feed roller that presses against a separation member and feeds out a plurality of originals stacked on the document table one by one in the paper feeding direction from the top, and the separation member and the an auxiliary roller that transfers the document to a pressure contact portion with the paper feed roller; a document detector that detects the presence or absence of the document on the document table; and when the document detector detects that the document is absent, the paper feed roller a vertical mechanism that lifts up the auxiliary roller using a rotating shaft of the auxiliary roller as a fulcrum; An automatic paper feeder comprising a plurality of tongue-shaped pieces that come into contact with a document table.