JPH0126667Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic paper feeder, particularly to an automatic document feeder in a facsimile machine.

A conventional automatic paper feeder feeds multiple documents stacked on a document table using an auxiliary roller at the contact point between a paper feed roller that rotates in the document feeding direction and an elastic separation member that presses against the paper feed roller. The documents in contact with the paper feed roller are sequentially fed out one by one due to the difference in the frictional forces of the paper feed roller, the separating member, and the document surface with respect to any one of the adjacent document surfaces.

When the document detector detects that there is no document on the document table and the facsimile apparatus stops, the next document is loaded, but in this case, the document cannot be loaded reliably unless the auxiliary roller is lifted. Lifting the auxiliary roller each time a document is loaded not only increases the number of steps in the operation, but also causes erroneous operations such as forgetting to lift the auxiliary roller and loading the document, making loading of the document uncertain. .

That is, the conventional automatic paper feeder has the disadvantage that the loading operation of the original requires care, and that the loading operation becomes uncertain due to carelessness.

The purpose of the present invention is to provide an automatic paper feeder that automatically lifts up the auxiliary roller when the document is waiting, and thereby allows the document to be loaded reliably without requiring special attention. be.

The automatic paper feeder of the present invention includes a paper feed roller that sequentially feeds out a plurality of originals stacked on a document table in the paper feeding direction, and a paper feed roller that presses against the paper feed roller so that the original comes into contact with the paper feed roller. a separating member that separates one document; an auxiliary roller that operates in conjunction with the paper feed roller to transport the document to a contact point between the paper feed roller and the separation member; and a paper feed roller that pivotally supports the auxiliary roller. a pair of arms rotatably provided around an axis of rotation; a document detector that detects the presence or absence of the document on the document table; and a document detector that engages with the arm to drive the arm up and down. a plunger; an elastic member that moves the plunger to a predetermined position when the document detector detects that there is no document; and an elastic member that is excited to resist the tensile force of the elastic member when the document detector detects that the document is present. and a solenoid that sucks the plunger.

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

FIG. 1 is a perspective view showing an embodiment of the present invention.

The automatic paper feeder shown in FIG. 1 includes a paper feed roller 1,
An elastic separation member 2, an auxiliary roller 3, a pair of arms 9, a document detector 4, a plunger 5 having an elongated hole 16 into which a drive pin 8 fixed to the arm 9 is inserted, and a plunger 5 suspended over the plunger 5. elastic member 6,
It is configured to include a solenoid 7 that engages with the plunger 5 and a document table 13.

Below, the operation of the automatic paper feeder shown in FIG. 1 will be explained in detail with reference to FIGS. 2 and 3. 2 is a side view of the embodiment shown in FIG. 1 when there is a document, and FIG. 3 is a side view of the embodiment shown in FIG. 1 when there is no document.

In FIG. 1, a plurality of originals 14 are loaded on the original table 13, and when the power of the facsimile device is turned on, the original detector 4 is activated as shown in FIG. Since the presence of a document has been detected, the facsimile device enters the sending state.

The paper feed roller 1 is fixed to a shaft 10, and the shaft 10 is pivotally supported by an arm 9. Further, a shaft 11 is supported on the arm 9, and an auxiliary roller 3 is fixed to the shaft 11, and the auxiliary roller 3 is configured to be able to rotate on a concentric circle of the paper feed roller 1 with the shaft 10 as a rotation axis. There is.

A drive pin 8 is fixed to the arm 9, and the drive pin 8 is inserted into a long hole 16 bored in the plunger 5. The plunger 5 is engaged with a solenoid 7 that pulls the plunger 5 downward when it is energized.
When the solenoid 7 is not energized, the plunger 5 is pulled upward by the elastic member 6. The tensile force of the elastic member 6 is applied to the auxiliary roller 3 and the shaft 1.
1 and the arm 9 to lift the arm 9 to a predetermined position, and the retraction force of the solenoid 7 overcomes the tension of the elastic member 6 and sucks the plunger, thereby causing the arm 9 to fall. Set.

When the facsimile device enters the sending state, motor 1
5 is started, and the rotation of the electric motor 15 is transmitted to the shaft 10 via the reduction gear to rotate the paper feed roller 1 in the clockwise direction. The rotation of the shaft 10 is transmitted to the shaft 11 via the belt 12, and the auxiliary roller 3 is transferred to the paper feed roller 1.
Rotate clockwise in the same direction. Further, since the document detector 4 detects the presence of a document and excites the solenoid 7, the arm 9 has fallen as described above, and the document 14 is moved by the auxiliary roller 3 that is in pressure contact with the document 14. Paper feed roller 1 and separation member 2
transport to the point of contact with.

Next, as shown in FIG. 2, when the uppermost document of the documents 14 reaches the contact point between the paper feed roller 1 and the separating member 2, the paper feed roller 1, the separating member 2, and the document surface each contact each other. The topmost sheet of the document is fed out due to the difference in the frictional force against any corresponding document surface.

The originals 14 stacked on the original platen 13 are fed out one by one starting from the highest one, and when the lowest original is fed out, the original detector 4 detects that there is no original as shown in FIG. Here, after the document detector 4 detects that there is no document, the drive circuit of the motor 15 is rotated so that the leading edge of the lowest document is supplied to the paper feed mechanism of the facsimile machine (not shown) and then the rotation of the motor 15 is stopped. movement is set.

When the document detector 4 detects that there is no document, the excitation current of the solenoid 7 is cut off, the plunger 5 is pulled up by the elastic member 6, and the lower end of the elongated hole 16 provided in the plunger 5 is connected to the drive fixed to the arm 9. In order to push up the arm 9 by pushing the pin 8, the arm 9 rotates counterclockwise about the shaft 10, and the auxiliary roller 3 is lifted upward to a predetermined position.

When the next document is loaded on the document table 13, the document detector 4 detects the presence of the document, and the electric motor 15 is activated to rotate the shaft 10 clockwise, and the shaft 11 also rotates clockwise. At the same time, the solenoid 7 is energized to retract the plunger 5, and as shown in FIG.
Press down. This pressing force and the weight of the auxiliary roller 3 and the shaft 11 are combined to cause the arm 9 to rotate clockwise and the auxiliary roller 3 to fall and come into pressure contact with the document surface, transferring the loaded document to the paper feed roller. Transfer to 1.

The solenoid 7 is energized by passing a large current for a short period of time at startup to give a strong attractive force to the solenoid 7, and after the plunger 5 has been completely retracted, the current is reduced to enough to hold the plunger 5, thereby reducing the heat generation of the solenoid 7. is prevented.

Therefore, regardless of the inclination angle of the document table 13, the loaded document can be reliably transferred between the paper feed roller 1 and the separating member 2.
can be transported to the point of contact with Here, the pressing force against the original affects the frictional force on the original surface described above, and if this pressing force is excessive, the feeding of each original by the paper feeding roller 1 and the separation member 2 becomes uncertain.

In this embodiment, this pressing force is determined by the weight including the auxiliary roller 3, arm 9, and shaft 11, so if the weight is large, the shaft 10
This can be solved by adding a compensating weight to the arm 9 on the opposite side.

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 the same direction as the paper feed roller.

As described above, by providing the plunger, solenoid, and elastic member, the automatic paper feeder of the present invention eliminates the need to manually lift the auxiliary roller when loading a document onto the document table. In this state, the auxiliary roller is automatically lifted up, so that there is no need to take special precautions when loading a document, and the document can be loaded reliably.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the present invention;
The figure is a side view of the embodiment shown in FIG. 1 when there is a document, and FIG. 3 is a side view of the embodiment shown in FIG. 1 when there is no document. In the figure, 1...paper feed roller, 2...separation member, 3...auxiliary roller, 4...document detector, 5...
... Plunger, 6 ... Elastic member, 7 ... Solenoid, 8 ... Drive pin, 9 ... Arm, 10, 11
...Shaft, 12...Belt, 13...Original table, 14
... Manuscript, 15 ... Electric motor, 16 ... Long hole.

Claims (1)

[Scope of utility model registration request] a paper feed roller that sequentially feeds out a plurality of originals stacked on a document table in a paper feeding direction; a separation member that presses against the paper feed roller and separates one of the originals that is in contact with the paper feed roller; an auxiliary roller that moves in conjunction with the paper feed roller to transfer the document to a contact point between the paper feed roller and the separation member; and an auxiliary roller that supports the auxiliary roller and is rotatable about the axis of the paper feed roller. a pair of arms provided on the document table; a document detector for detecting the presence or absence of the document on the document table; a plunger that engages with the arm to drive the arm up and down; an elastic member that moves the plunger to a predetermined position when the document detector detects the presence of the document; and a solenoid that is energized and attracts the plunger against the tensile force of the elastic member when the document detector detects the presence of the document. An automatic paper feeder comprising: