JP2551129Y2 - Automatic paper feeder - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic paper feeder such as a facsimile machine.

[0002]

2. Description of the Related Art As an automatic paper feeder of this type, for example, a paper feed roller rotating in conjunction with a document feed roller abuts a document stacked on a hopper, thereby conveying only the uppermost document one by one. There is an automatic paper feeder that feeds to rollers.
In this automatic paper feeder, an input hub of a spring clutch is connected to a document conveying roller shaft, an output hub of a spring clutch is connected to a support member rotatably supporting the paper feed roller, and a return member for returning the support member is provided. The apparatus includes a spring and a transmission gear for transmitting rotation of the document roller to the sheet feeding roller. Then, with the rotation of the document transport roller, the support member pivots down via a spring clutch, and the paper feed roller contacts the uppermost document, sends this document to the transport roller, and the slip torque of the clutch spring acts. The lowering operation of the support member is stopped. When the driving force is no longer applied to the document transport roller, the support member is raised by the return spring to separate the paper feed roller from the document.

[0003]

In the above-mentioned conventional automatic paper feeder, the load between the original conveying roller and the original conveying roller shaft, the load between the original conveying roller shaft and the bearing, and the load between the supporting member and the original conveying roller shaft are different. When the cumulative load in the rotational direction between the various members such as the load of the motor increases, the slip torque of the spring clutch must be increased accordingly, and there is a drawback in that the production becomes impossible due to the characteristics of the slip torque. The present invention has been made in view of the above-described drawbacks of the related art, and has as its object the purpose of smooth automatic feeding even when the load in the rotating direction between the various members constituting the automatic sheet feeding device increases. An object of the present invention is to provide an automatic paper feeder capable of feeding paper.

[0004]

According to the present invention, there is provided an automatic paper feeder comprising: a transport roller for transporting an original; a transport roller shaft which rotates integrally with the transport roller and has a first pin implanted therein; A bobbin in which a second pin having a play with the first pin is implanted, a substantially vertical first groove in which the first pin engages, and an inclined groove in which the second pin engages; A driving gear slidable with respect to the bobbin, a sliding gear meshing with the driving gear, and sliding integrally with the sliding operation of the driving gear, and a sliding operation of the sliding gear. A supporting member having a gear portion meshed with the sliding gear, a return spring for returning the sliding operation of the sliding gear, and a return spring rotatably supported by the supporting member and the sliding operation of the driving gear. And a paper feed roller for connecting and disconnecting the rotation of the drive gear. .

[0005]

In the present invention, the lowering of the supporting member rotatably supporting the sheet feeding roller is performed by its own weight, and the raising of the supporting member is performed by moving the sliding gear in the axial direction. Not affected by

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of the automatic sheet feeding apparatus according to the present invention, in which a sheet feeding roller is lowered, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. In these figures,
Reference numeral 2 denotes a conveying roller, reference numeral 3 denotes a conveying roller shaft on which a first pin 3a is implanted, and rotation control in one direction is performed by a spring clutch 4. Reference numeral 5 denotes a second pin having an amount of play L with the first pin. 5a is the bobbin in which it was planted. 7
Is a substantially vertical first groove 7 with which the first pin 3a engages.
This is a drive gear in which a slanted second groove 7b in which a and the second pin 5a are engaged is formed on the peripheral surface, and a gear portion 7c is formed.

A gear portion 8a meshes with the gear 7c.
And a gear portion 8b meshed with a gear portion 12a of the support member 12 described later, and is a sliding gear slidable vertically in FIG. The sliding gear 8 is constantly biased toward the drive gear 8 by a compression spring 10. The support member 12 is provided with a gear portion 12a formed in an arc shape, is rotatable around the transport roller shaft 3, and rotatably supports the paper feed roller 15. Paper feed roller 15
The transmission gear 17 is disposed between the gear 15a and the gear 7c of the drive gear 7.

The operation will be described below. First, the support member 1
The operation in which the paper feed roller 15 moves down and the paper feed roller 15 contacts the original will be described. When the play between the first pin 3a and the second pin 5a is maximum, the drive gear 7 is located below, the gear portion 7c meshes with the transmission gear 17, and the rotation is transmitted to the paper feed roller 15. . At this time, the sliding roller 8 is positioned below by the compression spring 10, the gear portion 12a of the support member 12 is out of mesh with the gear portion 8a, and the support member 12 is displaced by its own weight. As shown in FIG. 3, the paper feed roller 15 contacts the document and feeds the document.

Next, the operation of raising the support member 12 and separating the paper feed roller 15 from the original will be described. When the play between the first pin 3a and the second pin 5a is minimized as shown in FIG.
Pin 5a pushes the drive gear 7 upward along the second groove 7b. By this operation, the sliding gear 8 moves upward against the compression spring 10, and the gear portion 8b is
As the gear portion 8b rotates clockwise, the support member 12 rotates counterclockwise around the transport roller shaft 3 and rises, and the feed roller 1
5 is separated from the document.

[0010]

As described above, according to the present invention, the lowering and raising / lowering operations of the paper feed roller are controlled by the weight of the support member pivotally supporting the paper feed roller and the axial movement of the driving gear and the sliding gear. Since this operation is performed, there is an effect that the lowering and raising and lowering operations of the sheet feeding roller can be performed smoothly irrespective of the accumulation of the load in the rotating direction between the various members.

[Brief description of the drawings]

FIG. 1 is a plan view of the automatic paper feeder according to the present invention.

FIG. 2 shows a first pin and a second pin of the automatic sheet feeder according to the present invention.
FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a side view of the automatic paper feeder according to the present invention, in which a paper feed roller is lowered.

FIG. 4 is a plan view of the automatic sheet feeder according to the present invention, in which a sheet feed roller is raised;

FIG. 5 illustrates a first pin and a second pin of the automatic sheet feeding device according to the present invention.
FIG. 5 is a view showing the relationship with the pins of FIG.

FIG. 6 is a side view of the automatic paper feeder according to the present invention, in which a paper feed roller is raised.

[Explanation of symbols]

 Reference Signs List 2 transport roller 3 transport roller shaft 3a first pin 5 bobbin 5a second pin 7 drive gear 7a first groove 7b second groove 8 slide gear 12 support member 15 paper feed roller

Claims (1)

(57) [Scope of request for utility model registration] 1. A transport roller for transporting an original, a transport roller shaft that rotates integrally with the transport roller and has a first pin implanted therein, and a second roller having play with the first pin.
And a slidable with respect to the bobbin having a substantially vertical first groove in which the first pin engages and an inclined groove in which the second pin engages. A driving gear, a sliding gear meshing with the driving gear and sliding integrally with the sliding operation of the driving gear, and a gear portion meshing with the sliding gear by the sliding operation of the sliding gear. A return spring for returning the sliding operation of the sliding gear; and a feeder rotatably supported by the supporting member, the rotation of the driving gear being disconnected and connected with the sliding operation of the driving gear. An automatic paper feeder comprising a paper roller.