JPS6351933B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet separating device that reliably separates and sends out the foremost sheet one by one from a group of sheets stored in a hopper.

Copying machines, card readers, banknote counting machines, etc. store paper sheets of a certain size in advance in a hopper, automatically separate them one by one, and feed them to the copying section, reading section, counting section, etc. Therefore, multiple feeding such as double feeding must be prevented.

The configuration of a conventional friction type paper sheet separation device is shown in FIG. Figure 1 shows a pressure-contact type roller separator.
In addition to the friction type, there are belt separators that use belts instead of rollers, and belt separators that use a friction member with a concave surface instead of rollers. The principle of separating paper sheets is the same in all of the above cases, and here,
The following will explain the pressure type roller separator shown in FIG. 1 as an example.

In FIG. 1, the foremost sheet of paper _M1 stored in the hopper 1 is fed downward as the first pick-up roller 2 rotates intermittently, and is composed of a feed roller 3 and a gate roller 4. The sheet is fed to the sheet separating section where the sheet is separated. The gate roller 4 is relatively made of rubber or sponge.
It is made of a material that has a high coefficient of friction and is easily elastically deformed. This gate roller 4 is pressed against the feed roller 3 by a spring 5 with an appropriate force. The rotation of the feed roller 3 is transmitted to the pick up roller 2 via the rubber roller 7 from the roller 6, which has a visible protrusion 6a attached to the shaft end. If the pressing force is insufficient and sufficient contact pressure does not work between the feed roller 3 and the gate roller 4, double feeding may occur.

A sheet of paper is fed between the feed roller 3 and the gate roller 4 by the rotation of the first pick-up roller 2, and the sheet is fed out as the feed roller 3 rotates. In other words, the condition for paper sheets to be carried out is such that the frictional force F _fp between the feed roller 3 and the paper sheets is equal to the frictional force between the gate roller 4 and the paper sheets.
It is larger than F _gp (F _fp > F _gp ).

Therefore, the outer periphery of the feed roller 3 is formed of a friction member such as rubber, or a friction member 3a is attached to a part of the outer periphery of the feed roller 3 as shown in FIG.

On the other hand, when two sheets of paper are fed between the feed roller 3 and the gate roller 4, one
It must be separated into pieces and transported. The separation condition at this time is F _fp > F _gp > F _pp , where F _pp is the frictional force between the paper sheets. In other words, the paper sheets on the feed roller 3 side are sent backwards as the feed roller 3 rotates, but the paper sheets on the gate roller 4 side are sent to the separating section without any conveying force because the gate roller 4 is stopped. remain. In order to separate paper sheets using this frictional separation method, it is desirable that the gate roller 4 be stopped or rotated at a low speed in the opposite direction as described above with respect to the rotation of the feed roller 3.

As described above, in the friction separation method, the gate roller 4 is brought into pressure contact with the feed roller 3 to generate separation force.

However, since the gate roller 4, which is made of rubber, sponge, or the like having a high coefficient of friction, is pressed against the feed roller 3, wear of the contact surface of the gate roller 4 becomes a serious problem. That is, the gate roller 4 wears out as the sheets are separated and the number of sheets conveyed.
In order to improve the separation ability, it is necessary to strongly press the gate roller 4 against the feed roller 3, and
The gate roller 4 must be made of a material with a high friction coefficient to increase the frictional force. This directly leads to the disadvantage that the rate of wear of the gate roller 4 increases.

In the device shown in Fig. 1, a spring 5 is used to press the gate roller 4 against the feed roller 3 so that the separation force does not change even if the gate roller 4 wears, but the problem of wear still remains in this method. . That is, when the rate of wear of the gate roller 4 is relatively high, the wear progresses as the number of sheets conveyed increases, making it impossible to withstand long-term use.

The main cause of wear on the gate roller 4 is when a sheet of paper fed between the gate roller 4 and the feed roller 3 slips between the sheet and the gate roller 4 when it is carried out by the feed roller 3. That's true. If the gate roller 4 is rotated in the same direction and at the same circumferential speed as the feed roller 3 in order to eliminate this slippage, the separation function will be lost and multiple feeds will occur frequently.

In view of the above-mentioned points, the present invention reduces the problem of wear of the sheet separation roller that occurs when reliably separating and sending out the frontmost sheets one by one from a group of sheets stored in the hopper. The purpose of this invention is to provide a high-performance paper separation device.

A feature of the present invention is that the first feeding means and the second feeding means are provided spaced apart from each other to face the group of paper sheets stored in the hopper, and the first feeding means The first sheet of paper is fed into the separation section, and then the leading edge of the second sheet is fed into the separation section by the notch of the feed roller and the second pick-up roller, and the first sheet is separated. ,
When feeding, the sliding distance between the gate roller and the first sheet of paper is shortened.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the paper sheet separation device of the present invention will be described below with reference to the drawings. FIG. 2 shows the basic structure of the paper sheet separating device according to the present invention, and the same reference numerals as in FIG. 1 indicate the same parts.

This is a second feeding means for feeding the second sheet M ₂ from the frontmost part of the sheet group stored in the hopper 1 to the sheet separating section composed of a feed roller 3 and a gate roller 4. The second pick-up roller 8 is moved to the first
On the opposite paper leaf sending side of the pick-up roller 2,
It is arranged at an appropriate distance from the first pick-up roller 2. The rotation of the rubber roller 7 is transmitted from a roller 9 having a convex portion 9a attached to the shaft end to the second pick-up roller 8 via an intermediate rubber roller 10. Like the first pick-up roller 2, the second pick-up roller 8 is formed of a friction member in order to apply a conveyance force to the second sheet _M2 . on the other hand,
A friction member 11 and a notch 12 are provided on a portion of the circumference of the feed roller 3. That is,
The first pick-up roller 2 feeds the first sheet M ₁ into the sheet separation section, and then the feed roller 3
The friction member 11 conveys it backward. Further, the first pick-up roller 2 starts rotating, and when the rear end of the first sheet _M1 reaches near the position of the second pick-up roller 8, the second pick-up roller 8 is rotated. , feeds the second sheet M ₂ into the separating section. However, if the feed roller 3 and gate roller 4 are brought into strong pressure contact, the second sheet of paper
It becomes difficult for _M2 to enter the separation part, and especially those with low rigidity such as thin paper will bend in front of the separation part. Therefore, a notch 12 is provided in a part of the feed roller 3 so that the second sheet _M2 can easily enter the separating section, and this notch 12 and the rotation of the second pick-up roller 8 are synchronized. paper leaf
Feed only the tip of M ₂ into the separation section.

Next, the operation of the present invention will be explained with reference to FIG.

First, as shown in FIG. 3a, the first pick-up roller 2 is rotated to start feeding the first sheet _M1 to the separating section. After that, the notch 12 of the feed roller 3 and the second pick-up roller 8 are removed.
As a result of this rotation, the second sheet M ₂ is fed into the separating section as shown in FIG. 3b. The first paper sheet M ₁ and a part of the second paper sheet M ₂ are fed into the separating section, but since the feed roller 3 is rotating and the gate roller 4 is stationary, the separation part is as shown in Fig. 3c. 1 as shown in
Only the second sheet _M1 is separated from the second sheet _M2 ,
It is transported to the next process. Therefore, the slippage that occurs between the first sheet of paper to be separated and the gate roller 4 as in the conventional friction type separation device is reduced. By reducing this slippage, wear of the gate roller 4, which has been a major problem in the past, is significantly improved, and a high performance and stable separation state can be maintained.

It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, but can be modified in various ways without changing the gist thereof. For example, although this embodiment was applied to a roller type separation device, it is also applicable to a friction type separation device such as a belt separation device. Further, although a roller having a convex portion and an intermediate rubber roller are used for the intermittent movement of the pick-up roller, it is of course possible to perform the intermittent movement by making the pick-up roller shaft eccentric. Further, even if the first pick-up roller and the second pick-up roller are replaced with belts, the same effect as that of the present invention can be obtained.

According to the present invention, it is possible to significantly improve the problem of wear of the sheet separation roller as in the conventional friction type separation method, and there is no need for adjustment due to the wear of the sheet separation roller, thereby extending the life of the sheet separation roller. I can do it.

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view showing an example of a conventional paper sheet separating device, FIG. 2 is a partially sectional side view showing an embodiment of the paper sheet separating device of the present invention, and FIGS. 3 a to 3 c are FIG. 2 is an explanatory diagram of the operation of the paper sheet separation device of the present invention. 1... hopper, 2... first pick-up roller,
3...Feed roller, 4...Gate roller, 8...Second pick-up roller, 11...Friction member, 12
...Notch.

Claims (1)

[Claims] 1. A paper sheet separation device that separates and sends paper sheets one by one from a group of paper sheets stored in a hopper 1, comprising:
A feed roller 3 that has a friction member 11 and a notch 12 on a part of its circumferential surface, and feeds paper sheets using the friction member 11, and a gate that cooperates with the feed roller 3 to apply a separating force to the paper sheets. roller 4
a first feeding means 2 for feeding the foremost sheet _M1 of the group of sheets stored in the hopper 1 to the sheet separating section; A second member is located on the opposite side of the feeding means 2 and feeds the next sheet M ₂ after the foremost sheet M ₁ to the sheet separating section during the feeding process of the foremost sheet M ₁ . Feeding means 8
The second feeding means 8 is configured to feed the foremost paper sheet _M1 fed by the first feeding means 2.
The second feeding means 8 and the feed roller 3 operate when the rear end in the feeding direction passes through the second feeding means 8, and the second feeding means 8 and the feed roller 3 are activated when the second feeding means 8 starts operating. A paper sheet separating device characterized in that the notches 12 of No. 3 are configured to operate synchronously so that they are located in the paper sheet separating section.