JPS63101230A - Automatic sheet feeding device - Google Patents

Abstract

PURPOSE:To eliminate double feed or incapability of recording sheets in an automatic sheet feeding device in which recording sheets are supplied automatically one after another to a printer, by moving a hopper parallelly, and installing separating paws in the middle and at both ends of leading edge of recording sheet. CONSTITUTION:With the aid of a hopper 1, a load spring 3 presses recording sheets 2 to a feed roller 4 and a locational roller 5 retained in parallel with separating pawls 6. When the feed roller 4 begins rotating, the recording sheets 2 are sent either one or in plurality according to the current condition, and the locational roller 6 supporting their back is also rotated in linkage with motion of the sheets 2. This is effective to prevent the recording sheets 2 from warp and meandering. The recording sheets 2 sent previously in plurality simultaneously collide with the separating pawl 6, wherein perfect separation is possible because of side-end paws 6-2 having a plane C perpendicular to the surface of the sheets and a central pawl 6-1 having an inclined surface D.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic paper feeding device that automatically feeds recording paper one sheet at a time to a printer device.

[Conventional technology]

Conventional automatic paper feeders have a third
There was a friction separation method shown in the figure and a mold separation method shown in FIG.

When the Ig rubbing separation method shown in Fig. 3 is /A, the hopper 1
The recording paper 15 set on the recording paper 4 is pressed against the paper feed belt 18 by the four-door spring 17 with the hitot 16 as the axis.
Frixi separator 1 fixed in front of recording paper 15
9 and a paper feed belt 18 to separate one sheet of recording paper 15.

At this time, the paper feed belt 18, the frictional force μm, the recording paper 15
Frictional force μ8. Frictional force μ of Frixi iris separator 19
3, it must be μ8>μm>μm.

The claw separation method shown in FIG.
3 presses against the paper feed roller 24, and separation claws 25 fixed to both ends of the leading edge of the recording paper 21 separate 2101 recording papers.

[Problem that the invention seeks to solve]

The conventional technique shown in FIG. The s5+ separation method is easily influenced by the environment. In other words, when humidity is low, double feeding occurs as soon as static electricity is generated on the recording paper 15, and when humidity is high, double feeding or failure to feed is likely to occur due to a decrease in rigidity or elongation of the recording paper. For this reason, μm〉μm〉
Although it is necessary to have a large margin due to the μm relationship, and care must be taken in selecting each material, double feeding of the recording paper 15 or failure to feed the recording paper 15 is still an unavoidable problem. In addition, since the hopper 14 is pushed up by the load spring 17 around the pivot 16, the angle of the recording paper 150 with respect to the paper feed belt 18 increases due to the decrease in the number of recording paper 150 sheets, and the μm slightly decreases. This results in 150 sheets of recording paper.
There is also the problem that double feeding is more likely to occur.

Next, the claw separation method shown in Fig. 4 has advantages over the method shown in Fig. 3 in that the thickness and type of recording paper have patency, and the mechanism is simple. For various reasons, problems such as double delivery or undelivery may occur.

As described above, it is an object of the present invention to greatly reduce problems such as double feeding and unfeeding that occur when separating recording sheets by using the automatic sheet feeding apparatus according to the present invention.

[Means for solving problems]

In order to solve the problems of the conventional technology, the automatic paper feeder according to the present invention first eliminates the pivot 16 (22) common to FIGS. 3 and 4, and installs the hopper 14 (20) in parallel. By pushing up the recording paper 15 (21") in front of the separation claw fixed in front of the recording paper 15 (21), regardless of the number of sheets, the recording paper 15 (21") is always in a constant state, and the separation claw is This is an improved version of the recording paper 210 arranged at both ends as shown in the figure, and in consideration of its cross-sectional shape, it is characterized by having separation claws for the recording paper consisting of three claws at both ends and at the center.

〔Example〕

An automatic paper feeder that is an embodiment of the present invention! ! A schematic diagram first
As shown in the figure. To explain the basic operation of this automatic paper feeder, a plurality of sheets of recording paper 2 set on a hopper 1 are pushed up in parallel by a load spring 3 through the hopper 1, and a paper feed roller generates a rotational driving force. 4 and the positioning roller 5. As the paper feed roller 40 rotates, the recording paper 2 collides with the separation claw 6 fixed in front of it, and after separating one sheet, it is guided by the paper guide 7 in the direction of the arrow (A) in the figure, and then the paper presser roller of the printer device 11 is guided. 12 and paper feed row 213
double shipment. At this time, the recording paper 2 is handled between the paper pressing roller 12 and the paper feeding roller 13 while its both ends are guided by the side frames of the hopper 1 (not shown), so the problem of meandering is solved. The recording paper 2 that has been printed by the printer device 11 is guided by the paper guide 7 in the direction of the arrow (b) in the figure, is pressed onto the paper ejection roller 9 by the stacker cover 8, and is finally released by the rotation of the paper ejection roller 9. It is scooped into the stacker 10. Appropriate steps are provided between the paper feed path and the paper discharge path of the paper guide 7 to prevent the printed recording paper 2 from returning to the hopper. Further, after confirming with a sensor etc. that the recording paper 2 has been sent onto the paper ejection roller 9, the stacker cover 8 is closed in the direction of the arrow (B) in the figure by a cam (not shown) that operates using an arbitrary drive method to remove the recording paper 2. This presses the paper ejecting roller 9, and in consideration of the fact that the recording paper 2 printed by the printer device 11 is curled upwards in the figure and is ejected during operations other than this paper ejecting operation, only the necessary parts are marked with the arrows in the figure. It is open and stationary in the direction (A). Furthermore, the stacker cover 8 is transparent so that the printed state can be clearly seen.

FIG. 2 is a detailed view of the paper feeding portion in FIG. 1, and shows a paper feeding roller 4 and a positioning roller 5 held parallel to the one-separation claw 6, which is the most characteristic feature of the present invention.
A recording paper 2 is pressed by a load spring 3 via a hopper 1. When this preparation is completed, a driving force of a motor (not shown) is transmitted to the paper feed roller 4 through a signal processing section by inputting a signal such as the number of copies to be printed, start of printing, etc. from the outside, and paper feeding operation is started.

When the paper feed roller 4 starts to rotate, one or more sheets of recording paper 2 are fed at the same time depending on the situation, and in conjunction with the movement of the recording paper 2, the positioning roller 5 that supports the rear thereof also rotates. This is effective even though the feeding force of the paper feed roller 4 cannot be prevented, and is also effective in preventing the recording paper 2 from warping or meandering. Furthermore, it is desirable to use a load spring 3 that generates a pressing force between the recording paper 2 and the paper feed roller 4 so that the pressing force acts evenly and effectively, but here it is placed under each roller. It is. The recording sheets 2 that were fed simultaneously first are separated by the separation claw 6.
The two end molds 6-2 have a plane (0) perpendicular to the plane of the paper and the central mold 6 has an inclination Ifi (D).
-1 enables complete single-sheet separation. Also central type 6
It is important to appropriately select the inclination angle -1 depending on the rigidity of the recording paper 2, and it is also effective to use an elastic body. Furthermore, the bottom surface of the hopper 1 has a friction coefficient comparable to that of the recording paper 2, thereby preventing double feeding that occurs when the remaining amount of the recording paper 2 becomes small.

When a paper feeding test was conducted using the automatic paper feeding apparatus according to the present invention, it was possible to properly feed recording paper without double feeding, unfeeding, or meandering.

〔Effect of the invention〕

As described above, according to the automatic paper feeder of the present invention, recording paper is always fed to the printer device in a constant posture because the hopper moves in parallel and is guided by the side frame. Furthermore, by installing separation claws at both ends and the center of the leading edge of the recording paper, it is possible to ensure that there is no double feeding or unfeeding, and the mechanism is simple, which is effective in reducing costs.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an automatic paper feeder according to an embodiment of the present invention. Figure 2 is a detailed view of Figure 1. FIG. 3 and FIG. 4 are diagrams showing a conventional paper feeding device. 1... Hopper 2... Recording paper 3... Load spring 4...
...Paper feed roller 5...Positioning roller 6...Separation claw or more Applicant: Seiko Epson Corporation 1. Second cause

Claims (3)

[Claims] (1) A plurality of sheets of recording paper are sandwiched between at least one paper feed roller and a hopper, and the pressing force between the paper feed roller and the recording paper is applied from a load spring installed below the hopper. automatic feeding, in which the paper feed roller to which a driving force is transmitted by an arbitrary means collides the recording paper with a separating claw fixed in parallel with the paper feed roller, and supplies the required number of sheets one by one to the printer device; In the paper device, a positioning roller is held parallel to the paper feed roller in the vicinity thereof, and the hopper is positioned parallel to the separation claw by the paper feed roller and the positioning roller. Paper feed device. (2) The automatic paper feeder according to claim 1, wherein the separation claws are arranged at three positions relative to the leading edge of the recording paper: at both ends and at the center. (3) The automatic paper feeding device according to claim 1, characterized in that a stacker is disposed above a recording paper supply system comprising the hopper, the paper feeding roller, the positioning roller, etc.