JPH01172141A - Automatic sheet supply device - Google Patents

Abstract

PURPOSE:To make the sheet supply device possible to steadily supply sheets even when many sheets are inserted into a sheet-supplying position at a time by providing notches in the portions of a sheet-introducing member corresponding to pressure bar springs. CONSTITUTION:When a number of copies 6 are set at a time, the tip of the copies 6 strikes pressure bar springs 3, and the copies are stopped at a position above the tip-edge of a sheet introducing member 5. In this instance, the copies 6 are pressed against a sheet supply roller 2 by the pressure bar springs 3 with the sheet-introducing member 5 between. However, when the sheet- introducing member 5 is provided with notches 7 at its parts corresponding to the pressure bar springs 3, the copies 6 directly strikes and contacts the outer peripheral surface of the sheet supply roller 2 at the position of the notches 7. Therefore, when the sheet supply roller 2 is rotated, the copies 6 are supplied by the sheet supply roller 2 and steadily fed.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to an automatic paper feeder applied to copying machines, facsimile machines, and the like.

Conventionally, as shown in FIGS. 3 and 4, an automatic document feeder for a facsimile machine includes a document guide 1 for placing a document, and a document guide 1 arranged so that its outer peripheral surface slightly protrudes beyond the document guide 1. a pressing spring 3 for pressing the document against the paper feed roller 2; a separation piece 4 for preventing double feeding of documents; and a paper feed roller 2 attached to the document guide 1 on the upstream side of the paper feed roller 2. It is known that the introducing member 5 made of a low-friction film or sheet is disposed so as to be in contact with the outer peripheral surface of the paper feed roller 2.

Paper feeding operation by this automatic paper feeding device is performed as follows. First, a sender inserts a plurality of documents 6 along the document guide 1 in the direction of the arrow claw and sets them at a predetermined position. At this time, the document a slides on the introduction member 5 having a small frictional force and is inserted between the paper feed roller 2 and the pressure spring 3. In this state, the paper feed roller 2 rotates in the direction of arrow B, and the pressure spring 3
The document 6 pressed against the outer peripheral surface of the paper feed roller 2 is pulled out by the frictional force, and the separation piece 4 cooperates with the paper feed roller 2 to prevent the feeding of a plurality of documents 6. In this way, only the bottom sheet of the original 6 is separated and fed. In this automatic paper feeder, if the introduction member 5 is not provided, the leading edge of the inserted original 6 will hit the zero point of the fourth prisoner, and proper paper feeding will not be performed in this state.

Therefore, the introducing member 5 is provided so that the inserted document 6 is introduced to the point where the lower surface of the inserted document 6 reliably comes into contact with the paper feed roller 2 .

Problems to be Solved by the Invention However, with this configuration, although a relatively small number of originals can be fed reliably, when a large number of originals 6 are inserted, as shown in FIG. , a new problem arises in that the leading edge of the original 6 gets caught in the pressure spring 3 and is not fully inserted, and due to the presence of the introduction member 5, the original 6 does not come into contact with the paper feed roller 2, making it impossible to feed the paper. was there.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an automatic paper feeder that can properly feed paper even when a large number of sheets of paper such as originals are inserted into the paper feed position. With the goal.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention has a paper introducing member arranged on the upstream side of the paper feed roller so as to guide the paper from a guide to the outer peripheral surface of the paper feed roller. A notch is provided in a portion corresponding to a pressure spring that presses the paper feed roller against the paper feed roller.

Effect of the Invention With the above-described structure, the present invention allows the pressing spring to introduce the paper even if the paper is not inserted sufficiently when a relatively large number of sheets are inserted between the paper feed roller and the suppression spring. The member is directly pressed against the paper feed roller through the notch, and the paper can be reliably fed by the paper feed roller.

Embodiment FIG. 1 is a schematic perspective view showing an embodiment in which the present invention is applied to an automatic document feeder, and FIG. 2 is a sectional view thereof, which is similar to the conventional example shown in FIGS. 3 to 5. Parts are shown with the same reference numerals. In FIGS. 1 and 2, 1 is a document guide for placing a document 6, which is a sheet to be fed; 2 is a paper feed roller arranged so that its outer peripheral surface slightly protrudes from the document guide 1; Reference numeral 3 denotes a pressing spring for pressing the original against the paper feed roller 2. The pressure spring 3 is usually composed of a leaf spring, and is arranged at an acute angle to the outer peripheral surface of the paper feed roller 2 so that the document can be easily inserted between the pressure spring 3 and the paper feed roller 2. There is. Reference numeral 4 denotes a separation piece that cooperates with the paper feed roller 2 to prevent the document from being electrically transported; and 5 indicates a separation piece that prevents the document from being electrically fed in cooperation with the paper feed roller 2; This is an introduction member that guides the guide so that it comes into contact with the guide member. The introducing member 5 is made of a low-friction, flexible film or sheet, is fixed to the document guide 1, and has its tip abutted against the outer peripheral surface of the paper feed roller 2. The leading edge of the introduction member 5 ends slightly before (on the upstream side) the contact point of the pressure spring 4 with the paper feed roller 2. Furthermore, as can be clearly seen from FIG. 1, a notch 7 is formed at the tip of the introduction member 5 at a portion corresponding to the pressure spring 3. Note that although the shape of the notch 7 is an arc shape in the illustrated embodiment, the shape of the notch 7 is not limited to this and may be any shape.

The operation of the automatic paper feeder having the above configuration will be described below.

A sender inserts a plurality of originals 6 along the original guide 1 in the six directions of arrows and sets them at a predetermined position.

By this operation, the original 6 slides forward on the low-friction introducing member 5, is inserted between the paper feed roller 2 and the pressure spring 3, and is brought into contact with the paper feed roller 2 with appropriate pressure by the pressure spring 3. I am made to do so. In this state, when the paper feed roller 2 rotates in the direction of the arrow, the paper feed roller 2 pulls out the document 6 that is in contact with it by frictional force, prevents double feeding with the separation piece 4, and feeds the document one sheet from the bottom layer. feed one by one.

Next, when a large number of documents 6 are set, as shown in FIG.
It may stop at a position upstream of the leading edge of the introducing member 5. In this case, the original 6 is pressed against the paper feed roller 2 by the pressure spring 3 with the introduction member 5 sandwiched therebetween, but as described above, the introduction member 5 has a notch 7 in a portion corresponding to the pressure spring 3. , so the document 6 comes into direct contact with the outer circumferential surface of the paper feed roller 2 at this notch 7 portion. As a result, when the paper feed roller 2 rotates, the document 6 is fed out by the paper feed roller 2 and is well fed.

Although the above embodiment applies the present invention to an automatic document feeder, the present invention is not limited to the automatic document feeder, but can also be applied to any other paper such as recording paper. It goes without saying that it is possible.

Effects of the Invention As is clear from the above description, the present invention has an introduction member arranged to guide the paper from a guide to the outer peripheral surface of the paper feed roller on the upstream side of the paper feed roller. Since the structure is such that a notch is provided in the part corresponding to the pressure spring that presses the paper, when a relatively large number of sheets of paper are inserted between the paper feed roller and the pressure spring, there is no need to insert the paper sufficiently. Also, the pressing spring directly presses the paper against the paper feed roller through the notch of the introduction member, and the paper has the effect that the paper can be reliably fed by the paper feed roller.

[Brief explanation of the drawing]

FIG. 1 shows an automatic paper feeder according to an embodiment of the present invention.
FIG. 2 is a schematic perspective view, FIG. 2 is a sectional view thereof, FIG. 3 is a schematic perspective view showing an example of a conventional automatic paper feeder, and FIG. 4 is a sectional view thereof.
FIG. 5 is a sectional view showing a state in which a relatively large number of original documents are loaded into the apparatus. 1...Document guide, 2...Paper feed roller,
3... Pressing spring, 4... Separation piece, 5...
...Introduction member, 6...Manuscript, 7...Notch. Name of agent: Patent attorney Toshio Nakao and 1 other person1-
Document guide Fig. 1 2 - Paper feed roller 3 - Pressure 1f 4 - Separation piece 5 - Introducing member Fig. 3 Fig. 4

Claims (1)

[Claims] A guide for placing a plurality of sheets of paper, a paper feed roller that comes into contact with the paper set on the guide and feeds out the paper, a pressure spring that presses the paper against the paper feed roller, and an upstream side of the paper feed roller. An automatic paper feeder comprising: an introduction member that guides paper from a guide to an outer circumferential surface of a paper feed roller, and a cutout is provided in a portion of the introduction member corresponding to the pressure spring.