JPS6071433A - Automatic paper feeder - Google Patents

Abstract

PURPOSE:To obtain an automatic paper feeder having simple structure and excellent stability against deterioration of paper quality while enable mounting of many sheets at one time, by providing a cantilever resilient member on the rotary member while setting high the grictional force between the resilient member and the uppermost paper. CONSTITUTION:Upon rotation of shaft 2 in the direction A, the free end face of a resilient cantilever member 3 secured to the axial notche of said shaft 2 will contact while flexing with the uppermost paper 5 on a paper stack 1 to carry it in the direction B. Upon further rotation of shaft 2, following papers 5 will contact with a separating member 4. Since the frictional force between said member 4 and paper 5 are set higher than that between the papers, the following paper 5 is blocked from moving. While since the frictional force between said member 3 and the uppermost paper 5 is set higher than both of said frictional forces, only the uppermost paper 5 is inserted between a pair of feed rollers 6, 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field to which the Invention Pertains] The present invention relates to an automatic paper feeder, and more particularly to an automatic paper feeder for facsimile machines, copying machines, and the like.

[Prior art]

Conventional automatic paper feed devices in facsimiles and copying machines have an auxiliary roller at the contact point between a paper feed roller that rotates in the paper feeding direction and an elastic separation member that presses against the paper feed roller, and a paper tray on the paper tray. A plurality of stacked sheets of paper are transferred, and the paper feed roller is moved by the difference in the frictional force between the paper feed roller, the spacing member, and the paper surface relative to any one of the adjacent paper surfaces. The topmost sheets of paper in contact are fed out one by one.

In such a configuration, the structure is complicated, such as: ■ An auxiliary roller that transports the paper to the contact area between the paper feed roller and the separation member, its one-rotation mechanism, and a mechanism that lifts the auxiliary roller when loading the paper. Become.

(2) The number of sheets that can be loaded at one time is limited to approximately 50 sheets due to structural constraints and to prevent double sheet feeding due to increased frictional force due to the weight of stacked sheets.

(2) Rubber, which is a material with a large M vibration force, is used for the paper feed roller, but due to structural reasons, it is difficult to make the friction force extremely large, and the range of adaptation to changes in paper quality is narrow.

■Feeding stacked sheets from below is difficult because the frictional force between the sheets changes depending on the number of sheets stacked, making the sheet feeding operation unstable.

That is, the conventional automatic paper feeder has disadvantages in that it has a complicated structure, the number of sheets that can be loaded at one time is small, the stability against changes in paper quality is poor, and it is impossible to feed paper in a rounded manner.

[Purpose of the invention]

It is an object of the present invention to provide an automatic paper feeding device which has a simple structure, can load more than twice the number of sheets at one time as conventional paper feeders, has great stability against changes in paper quality, and is capable of paper feeding with a tampering mechanism. It is in.

[Structure of the invention]

The automatic paper feeder of the present invention includes a paper tray for stacking a plurality of sheets of paper almost horizontally, a member rotatably supported in front of the paper and horizontally suspended perpendicular to the conveying direction of the paper; a plate-shaped elastic member whose one end surface is fixed to a member and whose other end surface flexes when the member rotates and presses against the paper sheet to transport the paper sheet in the transport direction; and when the elastic member transports the paper sheet, the sheet and a separation member that presses the elastic member with one sheet in contact with the elastic member of the sheet and prevents movement of the second and subsequent sheets.

[Explanation of Examples]

FIG. 1 is a side view of essential parts showing an embodiment of the present invention, in which the automatic paper feeder includes a paper tray 1, a support shaft 2 as a rotating member,
An elastic member 3 fixed to the support shaft 2, a separating member 4, a plurality of sheets of paper 5 loaded, and a pair of feeding rollers 26 and 7.
including.

Below, the operation of the automatic paper feeder shown in FIG. 1 will be explained in detail with reference to FIGS. 2 to 4.

FIGS. 2 to 4 are side views of essential parts for explaining the process of paper feeding operation in the embodiment shown in FIG. 1, respectively.

In FIG. 1, the support shaft 2 is rotated in the direction A of the arrow by a drive mechanism (not shown). One end surface of an elastic member 3 is fixed to the axial notch of the support shaft 2 .

As the elastic member 3, a medium-hard rectangular rubber plate having an elastic surface with a large frictional force and a non-smooth surface is used. Separation member 4
Rubber or the like having elasticity is used.

The frictional forces of the elastic member 3 and the separation member 4 are set as follows. That is, the frictional force between the elastic member 3 and the hemp paper surface is Ml, the frictional force between the separating member 4 and the paper surface is M2,
When the frictional force between paper surfaces is M3, the magnitude of each frictional force is set so as to satisfy rMl>M2>M3J.

Here, the value of the frictional force M2 between the separation member 4 and the paper surface is determined by taking into account the change in the frictional force between the paper surfaces due to the weight and paper quality of the multiple sheets of paper 5 loaded on the paper tray 1. , is set larger than the predicted maximum value of the frictional force M3, and the frictional force M1 between the elastic member 3 and the paper surface is set sufficiently larger than the frictional force M2 to increase the separation ability without causing double sheet feeding. This is necessary to achieve stable paper feeding operation.

Next, when the support shaft 2 is rotated in the direction of the arrow A, as shown in FIG. 2, the unfixed end surface of the elastic member 3 comes into contact with the top surface of the paper 5 with flexure, and a frictional force is generated between the two. A force is applied to the plurality of sheets of paper 5 that moves the topmost sheet of paper in the conveying direction B. As a result, the topmost sheet of paper is transported in the transport direction B as the elastic member 3 moves, and the second and subsequent sheets are delayed.

As the rotation of the support shaft 2 progresses and the second and subsequent sheets of paper come into contact with the separation member 4 as shown in FIG. 3, a frictional force M2 acts on the second and subsequent sheets of paper.

Since the frictional force M2 is larger than the frictional force M3 between the paper surfaces, movement of the second and subsequent sheets is prevented.

Furthermore, since the frictional force M1 between the elastic member 3 and the paper surface is sufficiently larger than the frictional forces M3 and M2, the topmost sheet of paper is pulled by the elastic member 3 and further transported in the transport direction B.

As the rotation of the spindle 2 further progresses, as shown in FIG. 4, only the topmost sheet of paper moves in the conveyance direction B and is inserted into a pair of feed rollers 26 and 7 installed in a facsimile machine, for example. be done. When the spindle 2 rotates once, it returns to the position shown in FIG. 1 and moves on to the next paper feeding operation.

However, since the contact between the elastic member 3 and the paper surface is a large surface, whereas the contact portion between the paper feed roller and the paper surface is a small surface, the frictional force between the two can be set to be sufficiently large. .

As explained above, in this embodiment, the case of paper feeding by the beading mechanism is shown, but the mechanism of the spindle 2 and the elastic member 3 is arranged below the paper 5, and the separation member 4 is arranged above the paper 5. By providing a notch corresponding to the elastic member 3 on the bottom surface of the paper tray 1), the trade-in sheet feeding can be realized with the same stability as the pick-up sheet feeding.

〔Effect of the invention〕

As described above, according to the present invention, an elastic member having one end surface fixed to a rotating member is provided in place of the paper feed roller, and the frictional force between the elastic member and the paper surface is set to be sufficiently large. It is possible to realize an automatic paper feeder that is easy to load, has double the number of sheets that can be loaded at one time than conventional paper feeders, is highly stable against changes in the paper stock, and is capable of paper feed by picking up paper, making it practical and economical. The effect is extremely strong.

[Brief explanation of drawings]

Figure 1 is a side view of essential parts showing one embodiment of the present invention, Figures 2-
FIG. 4 is a plan view showing the main parts of the paper feed operation process in the embodiment shown in FIG. 1, respectively. In the figure, 1...paper tray, 2...
Support shaft, 3...Elastic member, 4...Separation member, 5...Paper.

Claims (1)

[Claims] A paper stand for stacking a plurality of sheets of paper almost horizontally; a member rotatably supported in front of the paper and horizontally suspended perpendicular to the conveying direction of the paper; one end surface fixed to the member; a plate-shaped elastic member whose end surface bends and presses against the paper when the member rotates to transport the paper in the transport direction; and a sheet that contacts the elastic member of the paper when the elastic member transports the paper. an automatic paper feeder comprising: a separating member that pinches the elastic member and presses the elastic member to prevent movement of the second and subsequent sheets.