JPH0568985U - Separation and feeding device assisting mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] An upper feed roller type lower feed belt type separation and feeding device is proposed with a feeding assist mechanism for further improving the feeding of documents. A separating and feeding device is provided in which a separate roller 2 is provided on a feeding roller 1, and a feed belt 4 is wound around the feeding roller 1 and a feed roller 3 provided at the document inlet side of the feeding roller 1. Paper springs 8 for pressing the document P against the feed belt 4 are provided near the document entrance of the roller 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a feeding assist mechanism of a separation sheet feeding device mounted in a facsimile device or the like.

[0002]

[Prior Art]

 One type of document separating / feeding device is a combination of a feeding roller and a separate roller. In this type of separating / feeding device, as shown in FIG. 5, a forward / reverse roller capable of forward and reverse rotation is provided on the feeding roller 1 as a separating member via a simple reverse roller, a stationary roller, or a torque limiter. A separate roller 2 made of any one of the above is rolled, and at the document entrance side of the feeding roller 1, interlocking with the feeding roller 1 on a document guide (not shown) for setting the documents P in a stacked state. A feed roller 3 is provided which is rotated.

In this apparatus, when the feed roller 3 is rotated in the feeding direction indicated by an arrow in the drawing in conjunction with the feeding roller 1 when feeding a document, the document P inserted into the document inlet side of the feeding roller 1 is fed. However, at the same time as the feeding is started from the lower layer portion toward the nip point between the feeding roller 1 and the separating roller 2 and feeding is started, at the same time, a plurality of sheets are attempted to be fed simultaneously by the friction separation operation of the separating roller 2. The originals P are separated from each other, and the originals P stacked on the original guide are separated and fed one by one from the bottommost one.

In addition, reference numeral 4 in the drawing denotes a transmission belt 4 wound around a pulley 5 provided on the shaft of the feeding roller 1 and a pulley 6 provided on the shaft of the feed roller 3.

[0005]

[Problems to be solved by the device]

 However, as a common problem of the sheet feeding device using the roller as the separating member, the feeding of the original P is deteriorated, and especially when a large number of originals P are stacked and set in the original guide, the original feeding failure occurs. There is a problem that it is easy to cause. Regarding this cause, in the roller separation method shown in FIG. 5, when a large number of originals are inserted in a stacked state with the paper edges aligned, the upper layer portion of the stacked originals is exposed on the separate roller 2 exposed at the original insertion end. After the collision, the distance from the front end of the document to the nip point of the feeding roller 1 becomes long, while the feeding force applied from the feed roller 3 to the document P is insufficient, so that the document P moves to the nip point of the feeding roller 1. It is thought that it will not be sufficiently sent to.

Therefore, as a measure for improving the feeding of a document to this type of separation and feeding device, as shown in FIG. 6, the feeding roller 1 and a feed roller 3 provided on the document inlet side are stretched. It has been proposed that the power transmission belt 4 be wound around the outer circumferences of the feeding roller 1 and the feed roller 3 and be used also as a feed belt for feeding the document P. In the case where the feed belt 4 is provided, the insertion end portion of the document P is placed on the document belt in the state of surface contact, so that the feed roller 3 shown in FIG. Compared with the case where the insertion force is applied, a strong feeding force that is carried toward the nip point between the feed belt 4 and the separate roller 2 can be applied to the lowermost layer of the insertion document P. The reproducibility can be improved.

The present invention proposes a feeding assist mechanism for further improving the feeding of originals when the above-described upper separate roller and lower feed belt type sheet feeding mechanism is adopted.

[0008]

[Means for Solving the Problems]

 As a means for achieving the above object, the present invention provides a separate roller on the take-in roller and wraps a feed belt around the take-up roller and the feed roller provided on the document inlet side. In the separating / feeding device, a paper spring that presses the document against the feed belt is provided near the document inlet of the feeding roller.

[0009]

[Action]

 With this type of paper spring, the document inserted on the feed belt is pressed against the feed belt by the paper spring, so when the feed belt is transferred in the feeding direction during paper feeding, it makes surface contact with the feed belt. The inserted original can be more powerfully incorporated.

[0010]

【Example】

 1 and 2 show a first embodiment of a retraction assist mechanism according to the present invention.

In the figure, reference numeral 1 is a take-in roller, 2 is a separate roller which is brought into rolling contact with the take-up roller 1, and in the case of this embodiment, a torque limiter set on a roller shaft (not shown) is set. An example is shown in which a forward / reverse rotation roller is used, which rotates forward at a branch point and carries out forward rotation by stopping or retracting the slip torque.

Reference numeral 3 denotes a feed roller provided on the document entrance side of the feeding roller 1. The feeding roller 1 and the feed roller 3 are separated from each other by placing a document P inserted thereon in a surface contact state. A feed belt 4 is wound around the nip point with the roller 2 and conveys it.

In this roller separation type paper feeding device, a paper P for gently pressing the original P inserted on the feed belt 4 from above onto the feed belt 4 near the original entrance of the feeding roller 1. Springs 8, 8 are provided. The paper springs 8 and 8 are themselves similar to those assembled by the separation pad type paper feeder. That is, the paper springs 8 and 8 are formed in a pair of left and right from both sides of the base plate portion 7 forming the mounting support piece thereof, and are formed of a single plate-shaped leaf spring member as shown in FIG. As described above, when the board portion 7 is fixed to the mounting portion 11 at the upper portion on the inlet side of the feeding roller 1 by hitting the mounting holes 9, 10 and 10 with the fasteners, the board portion 7 is arranged on both sides of the separate roller 2. The tip bending portion 8a of each paper spring 8 is adapted to elastically contact the feed belt 4 above the feeding roller 1.

In addition, in the figure, DS1 indicates a feeler-type document detection sensor which is installed on the front side of the feed belt 4 which is in contact with the leading end setting portion of the inserted document P.

In the case where the paper springs 8 and 8 are added, when the original P is set, if the leading end of the original P is inserted under the paper springs 8 and is inserted onto the feed belt 4, the inserted original P is obtained. It will be lightly pressed against the feed belt 4 by the pressing force of the paper springs 8, 8. Therefore, when the feeding roller 1 is rotated from this state and the feed belt 4 is transferred in the sheet feeding direction, the original surface is in close contact with the feed belt 4, and thus the surface contact is made on the feed belt 4. The lowermost layer of the inserted document P is more strongly retracted, and the document retraction force can be doubled.

A feature of the first embodiment is that the action points of the paper springs 8 and 8 can be close to the nip point between the feed belt 4 and the separate roller 2. On the other hand, the disadvantage is that it is difficult to adjust the strength of the paper springs 8,8. There is a concern that the original may be damaged if it is a weak original such as thin paper.

FIGS. 3 and 4 show a second embodiment of the feeding assist mechanism according to the present invention. In the second embodiment, the paper spring 8A for pressing the inserted original P against the feed belt 4 near the original entrance of the feeding roller 1 is replaced by a separate type which is arranged in a pair on the left and right sides of the separate roller 2. , A case where a wide seat spring having substantially the same width as that of the separate roller 2 is provided is illustrated.

Comparing the retraction assist mechanism of the second embodiment with that of the first embodiment, one wide paper spring 8A is pressed linearly over the central portion of the reconstitution original P. Therefore, there is an advantage that the fear of document damage is eliminated. However, since it is necessary to avoid interference with the separate roller 2, the paper spring 8A must be relatively rearwardly arranged near the document entrance, and compared with the first embodiment, the point of action of the paper spring 8A is the feed. The drawback is that the belt 4 and the separate roller 2 are moved slightly away from the nip point.

[0019]

[Effect of the device]

 As described above, in the feeding assist mechanism of the present invention, in the separating / feeding device including the upper separate roller and the lower feed belt system, the paper spring for pressing the document to the feed belt is provided near the document inlet of the feeding roller. As a result, the contact pressure between the feed belt and the document inserted on the feed belt is increased, and the document feeding by the feed belt at the time of sheet feeding is further enhanced.

[Brief description of drawings]

FIG. 1 is a schematic side view of a separation sheet feeding device according to a first embodiment.

FIG. 2 is a top view of FIG.

FIG. 3 is a schematic side view of a separation sheet feeding device showing a second embodiment.

FIG. 4 is a top view of FIG.

FIG. 5 is a schematic side view of a separation sheet feeding device showing a conventional example.

FIG. 6 is a schematic side view of a separation sheet feeding device showing an improved conventional example.

[Explanation of symbols]

 1 Retracting roller 2 Separate roller 3 Feed roller 4 Feed belt 5 Pulley 6 Pulley 7 Board part 8 Paper spring 8a Tip bend part 8A Paper spring 9 Mounting hole 10 Mounting hole 11 Mounting part DS1 Original detection sensor P Original

Claims (1)

[Scope of utility model registration request] 1. A separation sheet feeding device in which a separate roller is provided on a take-up roller, and a feed belt is wound around an outer circumference of the take-up roller and a feed roller provided at the document entrance side of the take-up roller. A feeding assist mechanism for a separation / feeding device, which is provided with a paper spring for pressing a document against a feed belt near the entrance.