JPH0416382B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a document feeding device for feeding a document onto a platen of a copying machine.

A conventional document feeding device of this type is constructed as shown in FIGS. 1 and 2, and is provided in front of the inlet portion of a platen belt b opposed to the upper side of a platen a, and has a side plate for corner registration. It consists of a chute c and a feed roll device d disposed opposite thereto. And the roll e of the feed roll device d
is connected to a drive shaft g via a universal joint f, and the shaft of the roll e moves in an arc around the universal joint along the elongated hole in the guide plate h, thereby feeding the roll e diagonally into the chute C. The original is corrected to its normal orientation. The pressing of the roll e was performed by setting the height of the elongated hole of the guide plate h relative to the upper surface of the chute.

Although the feed roll device in such a conventional document feeder has to feed from thin to thick documents,
It was difficult to set the pressing force, and since the roll was connected to the drive shaft g via the universal joint f, it was impossible to configure it without adjusting it by its own weight or the like. On the other hand, when the rolls were fixed, the pressing force had to be reset when the rolls wore out, making maintenance difficult.

The present invention has been made in view of the above, and includes a drive source in the feed roll device itself, supports the feed roll device so that the roll rotates toward the chute side by its own weight, and further provides a drive source for the feed roll device itself. By installing a pressing force adding device that applies the pressing force of the roll against the document, it is easy to set the pressing force for documents of different thickness, and it is possible to have a configuration that does not require adjustment due to its own weight. Changes in pressing force due to wear can be absorbed, extending the life of the roll. Furthermore, by adjusting the pressing force of the roll using a pressing force adding device, the optimal pressing force can be selected for thin and thick originals. It is an object of the present invention to provide a document feeding device for a copying machine which is capable of improving the reliability of the feeding roll device and can feed a wide variety of types of documents.

The configuration will be explained below based on the embodiment shown in FIG. 3 and below.

In the figure, 1 is a platen belt disposed opposite to the platen, 2 is a chute, and 3 is a feed roll device.
A support member 4 of this feed roll device 3 is rotatable in a direction perpendicular to the direction in which the document is fed, and is supported by a frame 6 through a pivot member 5, and a roll 7 is supported on this support member 4. . The rotating shaft 8 of the roll 7 is connected to a drive source 9 such as an electric motor, which is also provided on the support member 4, via a gear mechanism 10. The roll 7 is inclined with respect to the direction in which the original is fed, so that when the original is thrown into the chute 2 obliquely, this is corrected and the original is sent to the platen belt 1 in the correct orientation. On one side of the rotational fulcrum of the support member 4 and on the opposite side of the roll 7, a weight 11 is engaged and supported so as to be movable in the distance direction with respect to the fulcrum.

Further, a solenoid 12 is fixed to the frame 6 at a position facing the support member 4 of the feed roll device 3, and a movable member 12 of the solenoid 12 is provided.
a is engaged with the support member 4 via the link 13. The engagement between the link 13 and the support member 4 is such that the support member 4 is rotated in a direction that urges the roll 7 downward when the solenoid 12 is activated.

Thus, the pressing force of the roll 7 of the feed roll device 3 is obtained by the weight of the feed roll device 3, and this is adjusted by moving the weight 11. Furthermore, when the solenoid 12 is actuated in the above state, the roll 7 is moved downward via the support member 4 and a pressing force is applied.

In the above embodiment, a configuration consisting of a solenoid 12 and a link 13 was shown as the pressing force applying device, but as shown in FIG. The contactor 15 is slidably provided on the frame 6', and the contactor 1
5 may rotate the support member 4 via the cam 14 in the direction in which the roll 7 moves downward.

Since the present invention is as described above, it is easy to set the pressing force for originals of different thicknesses, and it is possible to have a maintenance-free configuration without adjustment due to its own weight.Furthermore, the pressing force changes due to wear of the roll 7. can also be absorbed, extending the life of the roll 7. Particularly, in the present invention, the frame is rotatably supported only in a plane substantially orthogonal to the document feeding direction, and a feed roll and a drive source for driving the feed roll are attached to the frame. Unlike conventional feed rolls with a drive source, there is no need for a transmission mechanism with a long path from the drive source outside the chute surface to the feed roll on the chute surface, and the drive source itself is It has the advantage of being able to be used as a weight for automatic adjustment mechanisms, and
Compared to conventional feed rolls that do not have a driving source, the conventional feed rollers have the drawback that the swing direction of the feed roll is in the document feed direction, which occupies a long width on the chute surface in the document feed direction. However, in the present invention, since the frame body is made rotatable in a plane substantially perpendicular to the document feeding direction, it does not occupy a large space on the chute surface, and the entire document feeding device can be made compact. effective.

[Brief explanation of drawings]

FIG. 1 is a plan view of a conventional document feeding device, FIG. 2 is a partially cutaway side view, and FIG. The figure is a perspective view, and FIG. 5 is a partially cutaway front view showing another embodiment. 1 is a platen belt, 2 is a chute, 3 is a feed roll device, 7 is a roll, 9 is a drive source, and 12 is a solenoid.

Claims (1)

[Claims] 1. Feeding of a document feeder including a chute located in front of a platen belt, and a feed roll provided above the chute to press a document and convey the document from the chute to the platen belt. In the roll device, a frame is pivotally supported on the document feeder main body so as to be rotatable only in a plane substantially perpendicular to the direction in which the document is fed by the chute, and the feed roll and the feed roll are driven by the frame. 1. A feed roll device for a document feeding device, comprising: a drive source, and the feed roll is configured to rotate toward a chute by its own weight.