JPS6221692B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding device used to automatically feed cut media one by one to a computer printer or the like.

As shown in FIGS. 1 and 2, the conventional paper feeding device of this type is provided with a pick roller 3 that comes into contact with the upper surface of the media sheets 2 stacked on the hopper table 1, and the leading edge of the media sheets 2 is The topmost sheet 2 of the medium paper 2 is locked by a claw 4 extending from the hopper stand 1 or other member, and by rotating the pick roller 3 in the paper feeding direction (direction of the arrow in the figure).
A is deflected between the pick roller 3 and the claw 4, and this deflection causes the paper sheet 2a to be passed over the claw 4, and the uppermost medium paper 2a is sent out one by one.
In addition, 5 in the figure is the electric motor for driving the pick crawler 3,
6 is the timing belt, 7 is the pitch crawler shaft, 6
a is a gear train, and 8 is a pick crawler drive shaft. The pick crawler drive shaft 8 in FIG. 2 is a square shaft and is slidably linked to the gear train 6a.

As shown in FIG. 1, the pick crawler 3 has a structure fixed to the pick crawler shaft 7, and a
As shown in the figure, the arm 10b is pivotally connected to the tip of the arm 10b which is pivotally connected to the side wall 1b of the hopper table 1, so that the distance from the side wall 1b, which is positioned according to the width of the media sheet 2, is maintained constant. However, in the conventional method, once the width of the media paper 2 is determined, the pit crawler 3
The structure was such that the positional relationship between the holder and the claw 4 was determined.

However, as mentioned above, the topmost sheet 2a of the medium paper 2 is bent between the pick roller 3 and the claw 4 due to the frictional force of the pick roller 3, so that it is separated and fed one by one. The condition naturally varies depending on the thickness of the media sheet 2 and the distance between the pick roller 3 and the claw 4. In a conventional paper feeding device in which the position of the pick crawler 3 is determined by the width of the media sheet 2, if the media sheet 2 is thick, it is difficult to feed the sheet, and if the media sheet 2 is thin, it is difficult to feed the sheet. The paper feeding condition changes depending on the thickness (stiffness) and dimensions of the media paper, such as double-sheet feeding often occurring, and the paper feeding condition changes depending on the thickness (stiffness) of the media paper. The drawback was that paper could not be fed.

This invention allows the distance between the pick roller and the claw to be adjusted according to the thickness or stiffness of the media paper being used, thereby ensuring that the media paper is fed out one by one no matter what the nature of the media paper is. It is an object of the present invention to overcome the drawbacks of the conventional devices described above by providing a paper feeding device that can perform the following operations.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4.

In the figure, numerals 1 to 7 are the aforementioned hopper stand or pick crawler shaft, and the pick crawler 3 is slidably mounted on the pick crawler shaft 7, which is a square rod.
The pick crawler shaft 7 is pivoted to a pick crawler drive shaft 8 that is pivotally supported by a stationary member (not shown) and a swing frame 10 that is pivoted to a fulcrum pin 9 that is coaxial with the drive shaft 8, and rotates the electric motor 5. is warm 1
1, worm wheel 12, electromagnetic crack 13,
Pulley 14, timing belt 6 and pulley 1
5 and is transmitted to the pick crawler shaft 7.

The hopper stand 1 has pins 16, 1 fixed thereto.
7 is pivotally supported by a stationary member (not shown),
The pulse motor 18 is driven as the medium paper 2 is fed by engaging the support piece 20 fixed to the belt 19 driven by the pulse motor 18 with the support piece 21 fixed to the side surface of the hopper stand 1. However, the upper surface of the medium paper 2 is controlled so as to always be at a predetermined paper feeding level.

The swinging frame 10 is composed of arms 10b, 10b at both ends and a beam 10a connecting them.
The beam 10a is mounted through a U-shaped notch 1a provided in the side wall 1b of the hopper stand. A pair of guide members 26, 26 made of sheet metal bent in a U-shape are attached to the beam 10a by passing through holes 27, 28 provided at both shoulders thereof. Furthermore, this guide member 26 is provided with opposing cut grooves 29, 29 on the side edges, and these cut grooves 2
9 and 29 are loosely fitted into opposing vertical edges of the notch 1a. Therefore, the pair of guide members 2
6 and 26 are connected to the side walls 1b and 1b of the hopper stand and are movable together with the side walls in the paper width direction;
Moreover, the beam 10a of the swing frame 10 is mounted on the hopper stand 1.
It is also movable up and down.

Each guide member 26 is provided with a long hole 33 that serves as a guide for the holder 25, which will be described later, in the longitudinal direction, and the side edge thereof is bent downward to form a guide 36 that guides the side edge of the holder 25. ing. The holder 25 is made of a U-shaped metal plate with a fork 24 formed at one end, and through holes 34 and 35 are provided at both shoulders of the holder 25, through which the beam 10a is inserted.
The beam 10a is inserted through the beams 4 and 35, and is mounted on the guide member 26 so as to be held therein.

The knob 31 for moving the holder 25 along the elongated hole 33 has a stem 30 extending downward, and this stem 30 passes through the center hole of the F-shaped leaf spring 32 and the elongated hole 33. The lower end thereof is adhered to the upper surface 25a of the holder 25.
The fork 24 of the holder is fitted into the circumferential groove 22 of the piece 23, which is integrated with the pick roller 3, with a slight play.
The position along the pick crawler shaft 7 is regulated.
In other words, the distance between the beam 10a and the pick roller shaft 7 is determined to ensure the fit between the fork 24 and the circumferential groove 22.

The holder 25 is pressed against the guide member 26 by the spring force of the leaf spring 32, and by moving the knob 31 along the elongated hole 33 against the frictional force between the two, the pick roller 3 is moved to the pick roller shaft 7. It can be moved to a desired position along the curve, and can be fixed at that position by the frictional force. Further, since the guide members 26, 26 are linked to the side walls 1b, 1b of the hopper stand, the media paper 2
When the side walls 1b, 1b are moved in accordance with the width of the drum, the pick rollers 3, 3 are also moved accordingly. Further, the guide members 26, 26 are linked to the side walls 1b, 1b of the hopper stand so as to be able to move up and down, and may obstruct the up-and-down movement of the pick roller 3 according to the amount of media sheets 2 loaded on the hopper stand 1. do not have.

According to the above structure, by moving the pick roller 3 along the pick roller shaft 7, the distance between the pick roller 3 and the claw 4 can be adjusted according to the thickness or stiffness of the medium paper 2. That is, when the media paper 2 is thick and difficult to bend, the pick roller 3 is moved toward the center of the pick roller shaft 7 to increase the distance between the pick roller 3 and the claw 4, and when the media paper 2 is thin and easy to bend. In this case, by moving the pick roller 3 toward the end and reducing the distance between the pick roller 3 and the claw 4, the media paper 2 can be reliably fed one by one regardless of the properties of the media paper 2. You will be able to do it. Furthermore, when the side wall of the hopper stand 1 is moved, the pick crawler 3 is also moved, so when the side wall of the hopper stand 1 is moved according to the width of the media sheet 2, the pick crawler 3 and the claw 4 are moved together. moves together with this, the distance between the pick roller 3 and the claw 4 does not change depending on the size of the medium paper 2.

As described above, the paper feeding device according to the present invention includes the guide member 26 linked to the side wall 1b of the hopper stand 1, and the guide member 26 is moved and fixed along the guide portion 33 parallel to the pick roller shaft 7. By regulating the axial position of the pick roller 3 with the flexible holder 25, the distance between the side walls 1b, 1b of the hopper stand and the pick rollers 3, 3 can be adjusted depending on the thickness or stiffness of the media sheet 2. Therefore, any media can be fed reliably and smoothly without the paper feeding condition changing depending on the properties of the media paper, making it difficult to feed the media paper, or causing double-sheet feeding. It is something that can be made of paper.

[Brief explanation of the drawing]

1 and 2 are perspective views showing the main parts of a conventional paper feeding device, FIG. 3 is a perspective view showing an embodiment of the present invention, and FIG. 4 is a perspective view of the pick crawler in the embodiment shown in FIG. 3. FIG. 3 is an exploded perspective view showing the moving and fixing means. 1...Hopper stand, 2...Media paper, 2a...Top media paper, 3...Pitsu crawler, 4...
Claw, 7...Pitsu crawler shaft, 10...Swivel frame, 1
0a... Beam, 22... Circumferential groove, 24... Fork, 25... Holder, 26... Guide member, 29
... cut groove, 31 ... knob, 32 ... leaf spring,
33...Long hole.

Claims (1)

[Scope of Claims] 1. Nails 4, 4 that lock both corners of the leading edge of the media sheets 2 stacked on the hopper table 1, and a pair of pick rollers 3, 3 that rotate in contact with the top surface of the sheets. In the automatic paper feeding device, the pick crawler 3 is slidably but unrotatably attached to the pick crawler shaft 7, and the guide member 2 is linked to the side wall 1b of the hopper stand 1.
6, this guide member 26 has a guide part 33 parallel to the pick roller shaft 7, and a holder 25 is provided which can move and fix freely along the guide part 33, and the holder 26 has a corresponding pick roller 3. The side walls 1b, 1b of the hopper stand and the pick roller 3,
3. A paper feeding device characterized in that the distance between the paper feeding device and the paper feeding device is adjustable.