JPS6127847A - Sheet taking-out mechanism of sheet feeding device - Google Patents

Abstract

PURPOSE:To prevent a trouble such as a jam and raise the reliability, by setting a roller which is always connectedly rotated at the same speed with a taking-out rubber roller which rotates when sheets are taken out,and a friction plate, as the sheets can be passed between this friction plate and the said former roller, in a system as shown in the title, of a printer. CONSTITUTION:A sheet 21 is pushed out by the rotation of a rubber roller 13, the corner of the sheet 21 strikes against a plate 15a, 15b and is turned over, and this sheet 21 is led from a receiving stand 14 into a space between a friction plate 18 and another roller 22. This sheet 21 can be sent out certainly at any time, as the said roller 22 is always rotated to the sheet sending-out direction by the rotation of the rubber roller shaft 4 and a power transmitting system which is not shown in the figure. In this system, the sheets can be conveyed one by one, in cooperation with the function of the friction plate 18.

Description

TECHNICAL FIELD The present invention relates to a paper supply device, and more particularly, to a paper supply device that is attached to and detached from a printer and automatically supplies stacked nine-sheet sheets to the printer in conjunction with the movement of a platen. This invention relates to a mechanism for taking out single sheet paper from a machine.

Description of prior art.

Printers are widely used as output devices for information processing devices, and the paper ejecting mechanism of the stack feed paper supply device, which serves as a single sheet paper supply device, uses a pickup roller (stacking) that operates in conjunction with the rotational movement of the printer's platen. A roller that makes contact with the topmost sheet of printing paper with a predetermined pressure and sends the topmost sheet of paper toward the platen by the frictional force during its rotation, and only one sheet of stacked printing paper. It is composed of a pair of grates that locally press the corners (two places) of the printing paper provided in the direction of movement of the printing paper to take it out using a spring force.

With the above configuration, when the pickup roller rotates in the paper conveyance direction, the top sheet of the stacked printing paper hits the plates provided at the corners at both ends of the printing paper in the traveling direction, and the corner of the printing paper turns over. By raising the printer, only the topmost sheet of the stacked printing sheets is delivered to the printing section of the printer.

However, due to the shape of the pair of plates that locally press the corners of the printing paper with a spring force, or due to variations in the frictional force between the topmost paper and the next paper, multiple sheets of paper may be printed at the same time in one paper removal operation. This has the disadvantage that it induces a so-called double feeding operation in which the feed is fed out.

Purpose of the Invention The present invention has been made in view of the above-mentioned conventional circumstances.
Therefore, an object of the present invention is to improve the above-mentioned drawbacks and improve reliability by eliminating problems such as paper jams or printing defects by reliably feeding only one sheet of paper to the printing section of the printer one after another. An object of the present invention is to provide a novel paper ejecting mechanism for a paper feeding device with high efficiency.

Structure of the Invention In order to achieve the above object, the paper count output mechanism according to the present invention performs paper conveyance (take-out) only when taking out the paper.
a rubber roller that rotates in the direction of the printing paper; a pair of plates that are provided in the direction in which the printing paper travels and locally presses two corners of the printing paper with a spring force; a lawn which is disposed at the same time and is interlocked with the drive shaft of the rubber roller by a motion transmission mechanism so as to always rotate in the paper conveyance direction at the same circumferential speed as the rubber roller, regardless of the rotational direction of the drive shaft of the rubber roller;
A rubber plate is held in contact with this roller with a certain pressure VC and has a predetermined groove formed in the paper conveyance direction, and the printing paper passes between the roller and the rubber plate. It is characterized by being made possible.

DETAILED DESCRIPTION OF THE INVENTION Next, a preferred embodiment of the present invention will be specifically described with reference to the drawings.

Fig. 1 is a plan view showing one embodiment of the present invention, and Fig. 2 is a plan view showing an embodiment of the present invention.
It is a sectional view cut along the line A-A' in the figure and seen in the direction of the arrow. Also, Figures 3, 4, 5, and 6 are
BB' and O-σ in the figure, respectively.

FIG. 3 is a partial cross-sectional view taken along lines DD' and w-d and viewed in the direction of the arrows, respectively.

The following description will be made with reference to these drawings in parallel.

A side frame 1゜2 of a sheet number ejecting mechanism is provided in the storage frame (not shown) of the sheet feeding device according to trigger 8AFc,
Bearing members 3a, 3 are attached to these side frames 19.2.
b, 3a, ``λ is attached 9, and the bearing members 3a, 3
A rubber roller shaft 4 is rotatably supported on the shaft b.

Further, the roller shaft 5 is rotatably supported between the bearing members ac and aa in the same way as described above.

A pulley 6 is fixed to the end of the rubber roller shaft 4, pυ,
A belt 7 is engaged with a pulley 6 to rotate the rubber roller shaft 4, and a power (not shown) K causes the rubber roller shaft 4 to rotate. Further, the rubber roller shaft 4 is provided with a pulley 8 having a built-in one-way clutch and a gear 9.

The pulley 8 is fixed to the roller shaft 5 via a belt 10 and transmits the power to the nine pulleys IIK, and the gear 9 transmits power to the gear 12 fixed to the 4-2 shaft 5.
The structure is such that the roller shaft 5 is always rotated in one direction regardless of the rotation direction. Further, the rubber roller shaft 4 holds a rubber roller 13 having a built-in one-way clutch for taking out the paper. The rubber roller 13 is always in constant contact with the paper 21 housed in the paper holder 14 by a compression spring 17. The paper holder 14 is provided with plates 15a and 15b so as to hold both end corners of the paper 21 accommodated in the paper traveling direction.
is hung.

Further, a roller 22 is fixed to the roller shaft 5. The roller n has a structure in which it contacts the friction plate 18 attached to the bracket 19 with constant pressure due to tension applied by a spring. Friction plate 18
is preferably made of a rubber material, and has a plurality of grooves 18a formed on its surface.

Here, when the rubber roller shaft 4 is rotated in the direction of arrow a by power (not shown), the rubber roller 13 is rotated in the same direction, that is, in the direction of arrow C (see FIG. 4), and the sheets stacked on the paper tray 14 are rotated. Push out the top sheet of paper No. 21 in the direction of arrow W. At this time, the paper 21 is guided from the paper holder 14 between the friction plate 18 and the roller n, with its corner portion touching the plates 15a and 15t). Roller n is a rubber roller shaft 40
Due to rotation, it always rotates in the direction of the arrow. That is, when the rubber roller shaft 4 rotates in the direction of the arrow a, the pulley 8 containing the one-way clutch also rotates in the direction of the arrow a, and the pulley 11 fixed to the roller shaft 5 via the belt 10 rotates in the direction indicated by the arrow. The roller n fixed to the roller shaft 5 is rotated in the direction shown by the arrow, and the paper drawn between the roller n and the 7-reaction plate 18 is fed out in the direction of the arrow W. At this time, the rubber roller 13 is rotated in the direction of arrow C by a built-in one-way clutch (see FIG. 4). Furthermore, the gear 9 with a built-in one-way clutch is connected to the rubber roller shaft 4.
When rotates in the direction of arrow a, it idles and the rubber roller shaft 4
be separated from.

Further, when the rubber roller shaft 4 rotates in the direction of arrow d (see Fig. 5), the pulley 8 with a built-in one-way clutch and the rubber roller 13 idle, and are fixed to the roller shaft 5 by the gear 9, Rotate roller n 12 times in the direction of the arrow.

Therefore, regardless of the rotating direction of the rubber roller shaft 4, the roller n always rotates in the paper feeding direction, that is, in the direction indicated by the arrow W, and the friction plate 18 and the roller n feed the paper in the direction indicated by the arrow W. At this time, since the friction plate 18 is formed in the shape or structure shown in FIG. 6, when two or more sheets of paper are about to pass between the friction plate 18 and the roller n, the grooves formed on the surface 1
Each sheet is separated by 8a.

As described in detail of the invention, by using the paper take-out mechanism of the paper supply device according to the present invention, it is possible to reliably feed a single sheet of paper to the printing unit of the printer, thereby preventing paper jams due to simultaneous supply of multiple sheets. It is possible to prevent such troubles as well as to ensure a highly reliable paper ejecting operation.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the internal configuration of the paper take-out mechanism of the paper supply device according to the present invention, and FIG. cross-sectional view,
Figure 3 is a cross-sectional view taken along line BB' in Figure 1 and viewed in the direction of the arrow, Figure 4 is a sectional view taken along line c-a' in Figure 1 and viewed in the direction of the arrow. The cross-sectional view shown in Figure 5 is D in Figure 1.
6 is a sectional view taken along the line -d and seen in the direction of the arrow, and FIG. 6 is a sectional view taken along the line -l of FIG. 1 and seen in the direction of the arrow.

Claims (1)

[Claims] A rubber roller that rotates in the paper transport (retrieval) direction only when paper is taken out, a pair of plates that are provided in the printing paper traveling direction and that locally press two corners of the printing paper with spring force, and a rubber roller that is placed on the paper transport path. is arranged at a certain distance from the plate, and is interlocked with the drive shaft of the rubber roller by a motion transmission mechanism, so that it always moves in the paper conveyance direction at the same circumferential speed as the rubber roller, regardless of the rotational direction of the drive shaft of the rubber roller. a friction plate that is held under constant pressure so as to be in contact with the roller and has a predetermined groove formed in the paper conveyance direction, and the printing paper is placed between the roller and the friction plate. A paper ejecting mechanism of a paper supply device, characterized in that the paper ejecting mechanism is configured to be able to pass through.