JPH02178139A - Paper feeder - Google Patents

Abstract

PURPOSE:To make stable paper feeding performable at all times by projecting a paper guide member farther from a friction member contacting with a paper feed roller under pressure. CONSTITUTION:When a tip of paper is fed to a pressure-contact point between a paper feed roller 3 and a friction member 6, this paper is guide by a guide member 7 projected farther from this friction member 6. Consequently, such a possibility that the paper tip might be folded as hitched on the friction member 6 is brought to notching. Next, even if the friction member 6 is worn out by friction with the paper after carrying out a large quantity of copies, the friction member 6 supported free of rotation is slightly rotated and merely refixed, whereby double-feed preventing performance is kept intact. In consequence, stable paper feeding is always performable.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a paper feeding device for a copying machine.

BACKGROUND OF THE INVENTION Conventional copying machine paper feeding devices have separation claws at a portion of the leading edge of the paper tray in order to separate and feed the sheets of paper placed in the paper tray one by one. Various methods have been adopted, such as a method in which a friction member is pressed against the lower part of the paper feed roller, and a method in which a friction roller rotating in the opposite direction to the paper feed roller is pressed into contact with the lower part of the paper feed roller.

Among these methods, the method in which a friction member is pressed into contact with the lower part of the paper feed means such as a paper feed roller has a simple structure and the separation of paper is highly stable depending on the type of paper, so it is widely used in copying machines. It is often used in paper feeding devices.

Hereinafter, the above-mentioned conventional paper feeding device for a copying machine will be described with reference to the drawings.

FIG. 12 shows a sectional view of a main part of a paper feed device of a conventional copying machine.

In the figure, 1 is a paper tray, 2 is a pickup roller for feeding the paper placed in the paper tray into the inside of the copying machine, 3 is a paper feed roller, and the holding member 4 at the bottom is a presser member 5. A friction member 6 fixed by is disposed in pressure contact with the friction member 6 .

Here, the topmost sheet of paper placed on the paper tray 1 is sent out into the copying machine by the pickup roller 2, and at this time, not only the topmost sheet but two or more sheets are sent out. This is prevented by the friction member 6, and only one sheet is fed into the copying machine by the paper feed roller 3.

Problems to be Solved by the Invention However, when feeding paper in the paper feeding device of a copying machine as described above, the leading edge of the paper gets caught on the friction member 6, and the paper is pushed by the pickup roller 2 from behind the paper. The leading edge of the paper often broke when being fed. This problem is particularly likely to occur when a copied sheet is double-sided copied or when multiple copies are made.

In order to prevent this, some methods used a presser member 5 or the like to reduce the exposed area of the friction member 6, but this reduced the ability to prevent paper double feeding.

Also, in the conventional configuration, while making a large number of copies,
The friction member wears out due to friction with the paper, resulting in frequent double feeding of paper.

In order to prevent this, if a material with good wear resistance is used as the friction member, the performance of preventing double feeding of paper will deteriorate, and if the friction member is replaced periodically, it will be very time-consuming to replace it. It was something.

The present invention is intended to solve the above problems, and an object of the present invention is to provide a paper feeding device that has a simple configuration and improves double-feed prevention performance.

Means for Solving the Problems In order to achieve this object, the paper feeding device of the present invention has a configuration in which a guide member for guiding the paper to the paper feeding means protrudes beyond the friction member.

Further, the friction member is rotatably supported and a fixing member is provided so that the friction member can be fixed at a desired position.

Effect With this configuration, when the leading edge of the paper is sent to the pressure contact point between the paper feed roller and the friction member, the paper is guided by the guide member that protrudes beyond the friction member, so that the leading edge of the paper is not caught by the friction member. This will prevent the paper from folding at the leading edge.

In addition, even if the friction member wears out due to friction with the paper after making a large number of copies, the ability to prevent expedited delivery can be maintained by simply rotating the rotatably supported friction member slightly and fixing it. There is no need to take the trouble to replace the friction member every time it wears out.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to screens. Note that the same reference numerals are given to the same parts as those of the conventional example.

FIG. 1 is a side view and a sectional view of a main part of a paper feeding device in a first embodiment of the present invention.

In the figure, 1 is a paper tray on which paper is placed, 2 is a pickup roller 3 for sending out the paper, is a paper feed roller, 6 is a friction member pressed against the lower part of the paper feed roller 3, 4
5 is the holding member to which the friction member 6 is attached, and 5 is the friction member 6.
7 is a guide member that guides the paper to the pressure contact portion between the paper feed roller 3 and the friction member 6, and 8 is a guide member mounted on the holding member 4.

Next, the operation will be explained in detail.

The leading edge of the paper is guided by the parts protruding from the friction members 6 provided on both sides of the friction members 6 of the holding member 4 and sent to the pressure contact section, so the leading edge of the paper is not caught by the friction members 6 and the paper is folded. Moreover, since the exposed portion of the friction member 6 is sufficiently removed, there is no reduction in the performance of preventing double feeding of sheets.

FIG. 2 is a side view of a main part of a paper feeding device according to a second embodiment of the invention, in which both sides of the friction member 6 of the presser member 5 which fixes the friction member 6 to the holding member 4 protrude from the friction member 6. This part guides the leading edge of the paper.

FIG. 3 is a side view of main parts of a paper feeding device according to a third embodiment of the present invention, in which paper is fed from paper tray 1 to paper feeding roller 3.
By providing the friction member 6 inside the surface of the guide member 7 that guides the paper, the leading edge of the paper is guided by the guide member 7 and sent out without being caught by the friction member 6.

FIG. 4 is a side view of a main part of a paper feeding device according to a fourth embodiment of the present invention, and by attaching guide members 8 protruding from the friction member 6 to both sides of the friction member 6 of the holding member 4, The leading edge of the paper is guided by the guide member 8 and sent out without being caught by the friction member 6. FIG. 5 is a perspective view of main parts of a paper feeding device in a fifth embodiment of the present invention,
Since the friction member 6 is located below the presser member 5, the leading edge of the paper is guided by the presser member 5 and does not get caught by the friction member 6 (also, the paper feed roller 3 is placed in the opening of the presser member 5). Since they are pressure-welded, there is no deterioration in double feed prevention performance.

Note that the holding member 5 may be divided into two parts.

FIG. 6 is a sectional view of a main part of a paper feeding device in a sixth embodiment of the present invention.

In the figure, 11 is a paper tray on which paper is placed, 12 is a pickup roller for feeding the paper, 13 is a paper feed roller, 16 is a roller-shaped friction member pressed against the lower side of the paper feed roller, and 17 is a friction roller 16. a fixed rotating shaft; 18 is a holding member that holds the friction roller 17;
19 is a ratchet wheel fixed or drivingly connected to the rotating shaft 17;
2 is a locking member pressed against the ratchet wheel 19 by a spring 21, 22 is a fixed shaft supporting the holding member 18, and 23 is a fixed shaft 2.
2 is a fixed gear, 24 is a knob attached to the rotation shaft 17, 25 is a guide member provided on the opposite side of the knob 24, and 26 is a knob rotatably connected to the ratchet wheel 19.

Next, the operation will be explained in detail.

When the friction member 16 is worn and the ability to prevent double feeding has deteriorated, or when changing the friction position of the wear member 16 during periodic inspections, etc., move the wear member 16 directly from the outside or by a connected member, Rotate in the opposite direction to the paper feed roller 13. The rotation of the rotating shaft 17 fixing the friction member 16 is transmitted to the ratchet wheel 19, causing the locking member 20 to rotate, and the locking member 20 enters between the next pawl of the ratchet wheel 19 by the force of the spring 21. By this operation, the friction member 16 moves to an unworn portion, and the initial performance of preventing double feeding is maintained.

FIG. 7 is a sectional view of a main part of a paper feeding device according to a seventh embodiment of the present invention, and the gear is connected to a gear 23 fixed to a fixed shaft 22 by pushing down a roller-shaped friction member 16 or a holding member 18. The ratchet wheel 19 rotates, pivoting the locking member 20, and the locking member 20 is inserted between the next pawl of the ratchet wheel 19 by means of a spring 21. This action causes the ratchet wheel 19 to
The roller-like friction member 16 that is drivingly connected to the roller moves in the part that is not worn out, so that it is very easy to maintain the property of preventing double feeding.

FIG. 8 is a sectional view of a main part of a paper feeding device according to an eighth embodiment of the present invention, and the friction member 16 can be easily rotated by attaching the knob 14 to the rotating shaft 17 to which a roller-shaped friction member 16 is fixed. It may be turned by hand or may use a tool or special parts.

FIG. 9 is a cross-sectional view of a main part of a paper feeding device according to a ninth embodiment of the present invention, in which a flange is formed in the shape of a knob 24 attached to a rotating shaft 17, and the outer diameter of the flange is adjusted to form a roller-like friction The outer diameter of the member 16 is larger than that of the member 16, and a guide member 25 with the same outer diameter is provided on the opposite side of the friction member 16. As the leading edge of the paper is guided to the paper feed roller 13 by sliding along the edge of the paper, the leading edge of the paper (especially when copying on both sides or when making multiple copies, this is likely to occur when the paper is curled downward).
The friction member 16 can prevent the paper from folding. Note that the guide member 25 may share the knob 24 or be integrated with the ratchet wheel 19, and the knob 24 may have a cylindrical shape with a brim portion that is the same as the knob portion.

FIG. 10 is a cross-sectional view of a main part of a paper feeding device according to a tenth embodiment of the present invention, which is provided with a knob 26 that is rotatably connected to a ratchet wheel 19, and is easy to operate even though the friction member 16 is rotated. The knobs 26 are arranged in different positions and directions, and the rotary drive connection may be a gear, a bevel gear, a worm, a chain, or the like. Further, the knob 26 may be rotated by hand, or may be a tool that uses a special part or the like.

FIG. 11 is a cross-sectional view of a main part of a paper feeding device according to an eleventh embodiment of the present invention, in which a locking member 20 is slidably arranged, and the locking member 20 is pushed or pulled from the outside (by which the locking Part 2
The locking part 0 pushes or pulls the pawl part of the ratchet wheel 19 to rotate the friction member 16, and the locking member 20 returns to its original position while rotating.

Effects of the Invention As is clear from the above explanation, the paper feeding device of the present invention prevents the leading edge of the paper from getting caught on the friction member and causing paper folds (and also prevents the friction member from wearing out and becoming heavy). Since the paper feed prevention performance does not deteriorate, stable paper feeding can be performed at all times.

[Brief explanation of the drawing]

1 to 4 are schematic side views of the main parts of the paper feeding device in the first to fourth embodiments of the present invention, respectively, and FIG. 5 is the main part of the paper feeding device in the fifth embodiment of the invention. The perspective view, FIGS. 6 and 7 are schematic side views of the main parts of the paper feeding device in the sixth and seventh embodiments of the present invention, and FIGS. 8 and 9 are respectively
The figures are sectional views of main parts of paper feeding devices in eighth and ninth embodiments of the present invention, and FIGS. 10 and 11 are main parts of paper feeding devices in tenth and eleventh embodiments of the present invention, respectively. FIG. 12 is a schematic side view of the main parts of a conventional paper feeding device. 1... Paper tray, 3... Paper feed roller, 4... Holding member, 6... Friction member, 7... Guide member . Name of agent: Patent attorney Shigetaka Awano and one other person (b) Figure 2 (b)

Claims (3)

[Claims] (1) A paper feeding means consisting of a paper feeding roller for feeding paper, a friction member provided so as to come into pressure contact with the paper feeding roller, and a guide member for guiding the paper to the paper feeding means. A paper feeding device comprising: the guide member protruding beyond the friction member. (2) A paper feeding means consisting of a paper feeding roller for feeding paper, and a friction member provided so as to be in pressure contact with the paper feeding roller, and the friction member is rotatably supported. Also, a paper feeding device including a fixing member for fixing at a desired position. (3) The fixing member comprises a ratchet wheel connected to the rotating shaft of the friction member, and a locking member biased to the ratchet wheel by an elastic member. paper equipment.