JP2551128Y2 - 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 drive gear having a slidable up and down with respect to the bobbin,
A sliding gear having an interval piece that is freely meshed with and separated from the driving gear; a compression spring that urges the sliding gear and the driving gear in a direction in which the sliding gear is separated from the driving gear; A supporting member that moves, a return spring that returns the rotation of the supporting member, and a power supply that is rotatably supported by the supporting member and that is connected to and disconnected from the rotation of the driving gear as the driving gear moves up and down. A paper roller; and a fixing plate having a fitting hole that fits the spacing piece and separates the spacing piece from the drive gear.

[0005]

In the present invention, the lowering and returning of the supporting member which rotatably supports the paper feed roller is performed by the axial movement of the driving gear and the sliding gear, and is not affected by the load in the rotating direction. .

[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 a rotation in one direction is restricted by a spring clutch 3b. Reference numeral 4 denotes a first pin 3a and a play amount L.
And the second pin 4a is the bobbin implanted.
6 is a substantially vertical first groove 6a engaged with the first pin 3a and an inclined second groove 6b engaged with the second pin 4a.
Is a drive gear formed on the peripheral surface and provided with two gears 6c and 6d.

A gear 8a meshes with the gear 6d.
This is a sliding gear that has a fitting projection 8b that fits into a fitting hole 12a of the support member 12 described later, and a spacing piece 8c, and is slidable in the vertical direction in FIG. 12
Is a support member provided with a fitting hole 12a and rotatably supporting the paper feed roller 13. A feed gear 13 a is integrally attached to the feed roller 13, and the feed gear 13 a
A transmission gear 14 is disposed between the transmission gear a and the gear 6c of the drive gear 6. Reference numeral 15 denotes a fixing plate provided with a fitting hole 15a into which the spacing piece 8c of the sliding gear 8 fits. 17
Is a return spring, one end of which is attached to the sliding gear 8 and the other end of which is attached to the device fixing portion. The return spring imparts a counterclockwise return sliding property to the support member 12 via the sliding gear 8 in FIG. is there.

The operation will be described below. First, the support member 1
An operation in which the paper feed roller 13 moves down and the paper feed roller 13 contacts the original will be described. When the conveying roller shaft 3 starts to rotate and the conveying roller 2 also starts to rotate, the pin 3a also rotates, and when there is almost no play with the pin 4a, the pin 3a is inserted into the groove 6a of the driving gear 6. Since the pin 4a is engaged with the groove 6b and the pin 4a rotates by the play amount L along the groove 6b, the drive gear 6 moves upward in FIG. By the movement of the driving gear 6, the gear 6c meshes with the transmission gear 14, and the gear 6d meshes with the gear 8a of the sliding gear 8, respectively.

The feed roller 13 includes a feed roller gear 13a.
Start spinning through. At the same time, the support member 12 also rotates integrally with the rotation of the sliding gear 8 to lower the paper feed roller 13 toward the original as shown in FIG. Further, when the transport roller shaft 3 rotates, the spacing piece 8c of the sliding gear 8 fits into the fitting hole 15c of the fixed plate 15, and the gear 8a and the gear 6d
As a result, the rotation of the sliding gear 8 stops, and accordingly, the lowering of the support member 12 also stops.

Next, the raising operation of the support member 12 will be described. Sliding gear 8 in which gear 8a and gear 6d are out of mesh
The support member 12 is rotated clockwise as shown in FIG. 6 by the return spring 17, and the paper feed roller 13 is separated from the document. When the sliding gear 8 is rotated by the return spring 17, the spacing piece 8c
Is disengaged from the fitting hole 15a of the fixing plate 15, the drive gear 6 is moved downward by the compression spring 10 as shown in FIG. 4, the gear 6c is disengaged from the transmission gear 14, and the rotation of the paper feed roller is stopped. At this time, the first pin 3a and the second pin 4a have the maximum play L as shown in FIG.

[0011]

As described above, according to the present invention, the lowering and raising and lowering operations of the paper feed roller are performed by connecting and disconnecting the drive transmission by moving the driving gear and the sliding gear in the axial direction. There is an effect that the lowering and raising / lowering operation of the paper feed roller can be performed smoothly regardless of the accumulation of the load in the rotating direction between the 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 4 bobbin 4a second pin 6 drive gear 6a first groove 6b second groove 8 sliding gear 12 support member 13 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.
A first groove that is engaged with the first pin and an inclined groove that is engaged with the second pin. The first and second pins are slid up and down with respect to the bobbin. A movable drive gear, a sliding gear having a spacing piece that meshes with and separates from the drive gear, a compression spring that urges the slide gear and the drive gear in a separating direction, and the sliding gear. A support member that rotates integrally with the gear, a return spring that returns the rotation of the support member, and a drive spring that is rotatably supported by the support member and that slides up and down with the drive gear. A paper feed roller whose rotation is connected and disconnected,
A fixing plate having a fitting hole into which the spacing piece fits and separates the spacing piece from the drive gear.