JPH03211127A - Paper feeding device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a paper feeding device in a facsimile machine or the like.

<Prior art> Conventionally, paper feeding devices for facsimile machines, etc.
There is something like the one shown in Figure 6.

This paper feeding device separates and feeds a plurality of originals inserted between a separating pad 61 and a paper feeding roller 62 one by one by rotation of the paper feeding roller 62, and transfers the fed originals to the Conveyance roller 6 rotates at a faster speed than paper feed roller 62
3, the document is conveyed to the document reading position. The tip of the shaft 62g of the paper feed roller 62 is machined into a cross-sectional shape. Attached to this shaft 62a are a driven gear 65 driven by a drive gear (not shown), a spring 66 having a winding direction tightening in the paper feeding rotation direction, and a power transmission member 64 for transmitting power to the shaft 62a.

The driven gear 65 is rotatably attached to the shaft 62a, and the power transmitted to the driven gear 65 is transmitted to the power transmission member 64 by the spring 66, and the power transmission member 64 causes the shaft 62a to rotate. 62a.

The spring 66 has a crutch function that transmits power only in the paper feeding direction. As shown in FIG. 7, the power transmission member 64 is a flat portion that faces the flat portion 62b at the tip of the shaft 62a with a gap therebetween and has a length in the direction perpendicular to the shaft that is shorter than that of the flat portion 62b. It has a supporting portion 64,a. By creating play between the shaft 62a and the power transmission member 64 in this manner, a non-power transmission period is provided.

Now, when the driven gear 65 is driven by the driving gear,
Power is transmitted to the power transmission member 64 via the spring 66,
This power transmission member 64 rotates together with the shaft 62a with the flat portion 64a in contact with one end portion of the flat portion 62b of the shaft 62a. Then, the first original is sent to the conveyance roller 63 by the paper feed roller 62. This conveyance roller 63
is rotating at a faster speed than the paper feed roller 62, so
The paper feed roller 62 is further driven in the paper feeding direction by the conveyance roller 63 through the document. Then, the shaft 62a rotates faster than the power transmission member 64 in the paper feeding direction, and one end of the flat part 62b of the shaft 62a rotates faster than the power transmission member 64.
a, and the other end of the flat portion 62b is connected to the flat portion 6.
It comes into contact with 4a. Since the spring 66 does not transmit power in the direction opposite to the paper feeding direction, the paper feeding roller 62 continues to idle. When the trailing edge of the first document passes the paper feed roller 62, it is stopped by the frictional load of the separation pad 61.

At this time, the driven gear 65 is rotating, but the shaft 62
Since power is not transmitted during the gap between a and the power transmission member 64, that is, during the non-power transmission period, the second document is not fed. Therefore, it is possible to leave a gap between the first document and the second document.

Thereafter, in the same manner, documents can be fed with a fixed interval between the documents.

<Problems to be Solved by the Invention> By the way, since the conventional paper feeding device described above uses the spring 66 to transmit torque, the transmitted torque is greatly influenced by the accuracy of the spring 66, and has large variations. Furthermore, since it is unstable due to the influence of environmental conditions, there are problems in that it is not possible to smoothly separate or feed documents, and it is not possible to ensure a space between documents.

Furthermore, even when a one-way clutch is used in place of the above-mentioned spring, it is necessary to perform some processing on the shaft of the paper feed roller in order to provide the above-mentioned non-power transmission period.
There was also the problem that assembly work was difficult.

SUMMARY OF THE INVENTION An object of the present invention is to provide a paper feeding device that can stably transmit torque, does not require machining of the shaft of the paper feeding roller, and can be easily assembled.

Means for Solving the Problems> In order to achieve the above object, the present invention separates a plurality of originals one by one and feeds them sequentially by a paper feed roller, and also separates a plurality of originals one by one and feeds them sequentially by a paper feed roller. In a paper feeding device that feeds documents with a predetermined interval between the documents by transporting the documents by a conveyance roller that rotates at a faster speed than the paper feed roller, A one-way clutch that fits onto the shaft of the roller and transmits power to the paper feeding roller only in the paper feeding direction, and a convex portion that is fitted onto and fixed to the one-way clutch and projects outward. a holding member, which is rotatably supported by the shaft of the paper feed roller and is rotationally driven in the paper feeding direction by a driving gear, and has an inner circumferential surface that abuts a convex portion of the holding member, and the holding member has the a power transmission part that transmits power in the paper feeding direction; and a power transmission part that comes into contact with a convex part of the holding member when the holding member rotates by a predetermined angle in the paper feeding direction with respect to the power transmission part, and the holding member and a driven gear having a rotation preventing portion that prevents rotation of the paper in the paper feeding direction.

<Operation> In the configuration described in 2, when the driven gear is driven by the driving gear, the power transmission part provided on the inner peripheral surface of the wave gear comes into contact with the convex part of the holding member, and power is transmitted to the holding member. . The power transmitted to this holding unit is transmitted to the shaft of the paper feed roller via the one-way latch, the paper feed roller rotates in the paper feeding direction, and one document separated from multiple documents is transferred to the transport roller. send. When the document reaches the transport roller, the transport roller further drives the paper feed roller through the document, and the paper feed roller rotates at the same speed as the transport roller.

The holding member rotates in one direction, which does not transmit the load of the latch, but due to friction, it rotates together with the paper feed roller at the same speed as the conveyance roller, until its convex part separates from the transmission member of the driven gear and reaches the rotation blocking part. Rotates in the paper feeding direction relative to the wave gear. When the protrusion hits the rotation blocking part, the protrusion becomes stationary relative to the rotation blocking part since one direction is the direction in which the power of the latch is not transmitted. When the document passes the paper feed roller, the paper feed roller is in a stopped state because power is not transmitted from the driven gear to the holding member. When the driven gear rotates further and its power transmission portion comes into contact with the convex portion of the holding member, the power is transmitted to the holding member, and the next sheet of original is fed in the same manner as described above. Therefore, the documents can be fed with a constant interval between the documents. Further, a one-way clutch is fitted to the shaft of the paper feed roller, a holding member is fitted onto the one-way clutch, and the holding member is driven by a driven gear rotatably attached to the shaft of the paper feed roller. Therefore, there is no need to process the shaft as in the conventional example, and attachment to the shaft (J) is simplified.

<Example> Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

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

In FIG. 1, 1 is a separation vat, and 2 is a paper feed roller rotating at a speed of 1. The multiple sheets of originals inserted between the separation pad 1 and the paper feed roller 2 are
The rotation of the paper feeds the paper sheets one by one. 3 is a conveyance roller that rotates at a speed V higher than V, and 4 is a carry-out roller that rotates at the same speed as the conveyance roller 3. The conveyance roller 3 conveys the document sent by the paper feed roller 2 to a reading position. The discharge roller 4 discharges the read document to the outside of the machine. The paper feed roller 2, conveyance roller 3, and discharge roller 4 are horizontally rotatably attached to a frame 9, and are driven by a motor 10 and a reduction gear 11. Power is transmitted via +2. Large gear 12 of the reduction gear 12
b, a driven gear 14 fixed to the conveyance roller 3, a small gear 12a of the reduction gear 12, and a gear unit I7, which will be described later.
are in mesh with each other, and a reduction ratio is obtained that satisfies the condition of Vl<V2, where the peripheral speed of the paper feed roller 2 is Vl and the peripheral speed of the conveyance roller 3 is Vl. A driven pulley 15 is attached to the unloading roller 4.
is fixedly installed and connected to the driven gear I4 by a belt 16, and power is transmitted so that it rotates at the same speed as the conveyance roller 3.

FIG. 2 is a perspective view showing the configuration of the gear unit I7.

A one-way clutch 21 that transmits power to the shaft 2a of the paper feed roller 2 only in the paper feeding direction is press-fitted into the holder 18 having a convex portion 18a18b. And loose fitting parts 19a, 19b
The cap 20 is inserted into the driven gear I9 having a shape, and the cap 20 is press-fitted to close the lid and form a unit.

FIG. 3 is a sectional view showing the gear unit 17 inserted into the shaft 2a.

The shaft 2a is not processed by D-cut or the like.

The driven gear 19 is rotatable with respect to the shaft 2a and has a hole! 9c and the hole 20a of the cap 20, it is supported so that it does not shake during rotation and maintains a gap with the holder I8 in the radial direction at all times. The power in the paper feeding direction transmitted to the driven gear 19 is transmitted to the shaft 2a via the holder 18 and the one-way clutch 21.

The operation of this device having the above configuration will be explained below.

In FIG. 1, when a plurality of originals are inserted, a sensor (not shown) detects the originals, and the motor 10 is energized to rotate.

Power is transmitted to each roller via each gear. The document is separated by a separation pad 1 and a paper feed roller 2, and the first page is fed at a speed vI. Gear unit 1 at this time
7 is shown in FIG. In the paper feeding state, the driven gear 19 rotates in the direction of arrow A, and one end 1 of the loosely fitting portion serves as a power transmission portion.
9a+ and 19b+ are the convex parts 18a and 18b of the holder 18
come into contact with. Since the one-way clutch 21 transmits power in the paper feeding direction (arrow A direction), the shaft 2a also rotates in the arrow A direction, and the paper feed roller 2 rotates in the paper feeding direction to feed the original at the paper feeding speed V1. When the document reaches the transport roller 3, the paper feed speed becomes V, and V<V.

The manuscript is stretched due to this relationship. Therefore, since the paper feed roller 2 rotates at a speed v2, the driven gear I9 rotates in the opposite direction relative to the paper feed roller 2 at a speed of V2 V+, and the convex portion 18a
, +8b come into contact with the other end 19a3, 19b2 of the loose fitting portion as a rotation preventing portion, as shown in FIG. The holding member is in a direction that does not transmit the load of the one-way clutch 21, but due to friction it is held together with the paper feed roller 2 and the conveyance roller 3.
The convex part rotates at the same speed as the driven gear 19
9a+, +9b, the other end 19a,, I 9b2
It rotates in the paper feeding direction with respect to the driven gear 19 until it reaches . The convex portions +8a and 18b are connected to the other end 19a2. I
9b2, it is the direction in which the power of the one-way clutch 21 is not transmitted, so the other end 19a2. Convex portion 18a for I 9b2.

18b is relatively stationary.

When the end of the first page passes the paper feed roller 2, the friction load of the separation pad 1 causes the paper feed roller 2 to move into the loose fitting portion 19a.
+ -19a2.19b+-+ It stops for a distance of 9bt and returns to the state shown in Fig. 4. During this time, the driven gear 19 is still rotating, but the power for the distance described above is not transmitted to the paper feed roller 2, so the second page of the document is not fed. Therefore, it is possible to leave a gap between the first and second pages.

When the state shown in FIG. 4 is reached, the paper feed roller 2 rotates in the paper feeding direction and feeds the original as described above. Thereafter, a plurality of documents are sequentially fed one by one at regular intervals in the same manner.

In this way, since torque is transmitted using the one-way clutch 21, the torque can be transmitted stably, and therefore the document can be smoothly separated and fed, and the document can be easily separated and fed. This allows you to feed paper with a certain amount of space between the document and the document.

Further, the one-way clutch 21 is fitted onto the shaft 2a of the paper feed roller 2, the holder 18 is fitted onto the one-way clutch 21, a driven gear 19 is rotatably attached to the shaft of the paper feed roller, and a cap 20. As shown in Fig. 3, they are assembled together and fitted into the shaft 2a, so there is no need to process the shaft 2a as in the conventional example, and installation to the shaft is easy. Become.

<Effects of the Invention> As is clear from the above, the paper feeding device of the present invention includes a one-way clutch that fits onto the shaft of the paper feeding roller and transmits power to the paper feeding roller only in the paper feeding direction; A holding member that is fitted onto and fixed to the one-way clutch and has an outwardly protruding convex portion, and is rotatably supported by the shaft of the paper feed roller and rotated in the paper feed direction by the drive gear. A power transmitting section that is driven and has an inner circumferential surface that transmits power in the sheet feeding direction to the holding member by contacting the convex portion of the holding member; a rotation preventing portion that comes into contact with a convex portion of the holding member to prevent rotation of the holding member in the paper feeding direction when the holding member is rotated by a predetermined angle in the paper feeding direction with respect to the paper feeding direction. Because it is equipped with a driven gear, documents can be reliably separated and fed smoothly, and the paper can be fed with a certain gap between documents, and the shaft of the paper feed roller does not need to be machined. It is easy to assemble.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the configuration of an embodiment of the present invention, and FIG.
The figure is a perspective view showing the configuration of the gear unit in the above embodiment, FIG. 3 is a sectional view showing the gear unit inserted into the shaft of the paper feed roller, and FIG. 4 is the gear unit when the paper feed roller is driven. 5 is a sectional view showing the state of the gear unit when the paper feed roller is not driven, FIG. 6 is a perspective view showing the configuration of the conventional example, and FIG. 7 is a sectional view showing the configuration of the conventional example. FIG. 3 is a diagram showing the relationship between the shaft of a paper roller and a power transmission member. ■・・・Separation vat, 2・Paper feed roller, 2a shaft, 3・
Conveyance roller, 4...Export roller, 17.Gear unit, 18...Holder, 18a I
8b-convex portion, 19-driven gear, +9a19b... loose fitting portion, 20... cap, 21... one-way clutch. Patent applicant: Sharp Corporation Agent
Patent attorney Previously mentioned 葆 Haka 1 person 2nd illustration 9 b 1 8b Even neN river Φ mon 1 p V) 8b tsuwa 1 □

Claims (1)

[Claims] (1) Separate multiple documents one by one and feed them one by one using a paper feed roller, and the document fed by the above paper feed roller is transported by a transport roller that rotates at a faster speed than the above paper feed roller. In a paper feeding device that feeds documents with a predetermined interval between the documents, the device fits onto the shaft of the paper feed roller and applies power to the paper feed roller only in the paper feeding direction. a one-way clutch for transmitting the information; a holding member that is fitted onto and fixed to the one-way clutch and has an outwardly protruding convex portion; a holding member that is rotatably supported by the shaft of the paper feed roller and is driven; a power transmission section that is rotatably driven in the paper feeding direction by a gear and that contacts a convex portion of the holding member on an inner circumferential surface to transmit power in the paper feeding direction to the holding member; a driven gear having a rotation preventing portion that comes into contact with a convex portion of the holding member to prevent rotation of the holding member in the paper feeding direction when the driven gear rotates by a predetermined angle in the paper feeding direction with respect to the power transmission portion; A paper feeding device characterized by comprising: