JPH0121057B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a paper sheet separation device, and particularly to a paper sheet separation device in which the cycle of separated paper sheets is stable and is suitable for preventing double feed due to roller wear. Regarding equipment.

[Background of the invention]

In a sheet separation device, there are two types of pick-up means for separating and supplying sheets from a hopper in which sheets are piled up: one is of an intermittent drive type, and the other is of a continuous rotation type. The latter does not cause malfunctions due to inertia even at high speeds, but it has a structure that picks up sheets with each rotation due to the difference in sheet feeding force between the high friction coefficient part and the low friction coefficient part, so the hopper If the sheet pressing force becomes strong, even the low friction coefficient portion may malfunction and feed the sheet, making it unsuitable for large-capacity hopper-type sheet processing devices where the hopper has a strong pressing force. Therefore, the former is used in large-capacity hopper-type paper processing equipment, but
When separating and sorting paper sheets at high speed, there has been a problem that the period of the paper sheets tends to become unstable because the inertial energy of the pick-up means increases as the speed increases. For example, if the normal cycle (distance between the leading edges of paper sheets) is 150 mm, it may become around 100 mm at high speeds, and as the speed increases, the cycle becomes shorter and the sheets overlap and become continuous. become separated.

To prevent this, it is possible to constantly increase the resistance force for passing the paper by providing a fixed rubber member or the like on the front plate surface of the front surface of the hopper where the paper comes into contact with the hopper. Since the passing resistance force continues to act even at times when no resistance is required, there is a problem that misfeeds and skews occur.

Furthermore, since the gate means is made of rubber or the like, there is a problem in that the stronger the resistance force that the sheet passes through, the greater the amount of wear on the gate means.

Also, if the end face of the rubber roller of the gate means is worn, double feed is likely to occur, so if you take into account the wear from the beginning and set a tight overlap value between the gate means and feed means, misfeed is likely to occur, so do not make the overlap extremely tight. The problem was that it could not be done.

[Purpose of the invention]

An object of the present invention is to provide a highly reliable paper sheet that can achieve stable sheet separation operation without malfunction even at high speeds, by simultaneously satisfying the contradictory requirements of preventing wear of the gate means and preventing erroneous feeding of subsequent sheet sheets. An object of the present invention is to provide a leaf separation device.

[Summary of the invention]

The present invention comprises hopper sections 2 and 3 in which a plurality of sheets can be set, a pick-up means 4 for feeding the sheets one by one to a separating means, and a gate means 5 for applying braking force to the sheets to prevent double feeding. Feed means 6 is provided opposite to the gate means 5 and feeds the paper sheet sandwiched between the gate means 5 and the gate means 5 in the forward direction. It has a part of the conveying section 7 with a high friction coefficient and an eccentric rotation center 12, and the radius from this rotation center 12 is maximum and minimum on the front and rear circumferential surfaces of the conveying section 7 in the forward direction, respectively. It is rotatably mounted so that it changes continuously over the entire circumference so that the braking force acting on the paper sheet reaches its maximum before and after the conveying section 7 of the feed means 6 contacts the paper sheet and feeds it. It is characterized in that it is configured to change continuously so as to be the minimum.

[Embodiments of the invention]

Examples of the present invention will be explained below. FIG. 1 shows a sheet processing apparatus equipped with a first embodiment of the present invention. Gate means 5 stationary at point P
and the feed means 6, which rotate once for each sheet, overlap, and the frictional force generated in the gate means 5 when the sheet 1 passes through this gap acts as a braking force to prevent double feeding of the sheet. There is. The strength of the braking force of the gate means 5 is set to such an extent that even a single sheet of paper cannot pass through in this state. When taking out paper sheets from the hopper section composed of the front plate 3 and the floor plate 2, the paper transport section 7 (made of a material with a high friction coefficient such as rubber) installed in the feed means 6 and the paper Both the sheet feeding force generated when the leaf surfaces contact and the sheet feeding force generated when the pick-up means 4 is intermittently driven by the synchronous cam 11 pivotally supported by the feed roller shaft 12 acted. Sometimes the paper is configured to be taken out one by one.

By the way, in the conventional system, the above-mentioned braking force is always set to a constant value regardless of the rotational phase of the feed means. However, in this embodiment, as described above, the force for feeding the paper sheets is only applied at the beginning, and the drive of the pick-up means 4 is completed in the middle, and the timing of transport by the paper transport section 7 provided in the feed means 6 is changed. Once finished, the feed force is discontinued. When the feeding force is interrupted, the sheet is removed by the gate means 5.
The braking force prevents the vehicle from passing through point P.

By the way, as is clear from FIG. 1, by the time the paper sheet passes point P, the leading edge of the normal paper sheet has already passed point Q, so the circular belt 8 applies a strong conveying force to the paper sheet. Transported without stagnation. The structure is such that when the paper sheet advances further and reaches point R, an even stronger conveying force is applied by the conveyor belts 9 and 10. According to this embodiment, the feeding force applied to the paper sheet is concentrated at the beginning of the rotation of the feed roller, and the braking is performed at this initial portion so that the minimum sheet braking force suitable for the feed roller is generated at point P. Because the resistance was set lower than before,
Unnecessary wear of the gate means 5 can be prevented.

In this embodiment, the spacing between sheets is maintained as follows. When the paper sheet is a banknote, the outer circumferential length of the feed means 6 is set to 155 mm, and the width of the banknote is approximately 90 mm, so 65 mm is theoretically the distance between the banknotes. Incidentally, in reality, banknotes may be conveyed even in this 65 mm region, resulting in a periodic abnormality problem. In particular, when a sheet of paper that is about to be double fed reaches the vicinity of point Q, cycle abnormalities are likely to occur. By increasing the braking force that acts on the paper sheets in this 65 mm region more than normal, double feed is prevented and the cycle of the paper sheets is kept constant. As mentioned earlier, at this timing, the paper sheet usually reaches the Q point or the R point and is given a strong conveying force by the belt 8 or the conveyance paths 9, 10, causing skew or paper sheet stagnation. Never.

Further, even if the braking force at point P is increased, the gate means 5 will not be rubbed by the paper sheets, and the paper sheets will only be pressed against the gate means, so that the gate means will not be worn out. Alternatively, it is also possible to apply the braking force at a point other than the point P, such as the pickup means 4.

The main parts of this embodiment will be explained in detail below with reference to FIG. The feed means 6 is made of a perfect circle, and the paper sheet conveying section 7 provided on its surface is also made of a perfect circle. However, since the sheet conveyance section 7 is made of rubber, its radius is convex by about 3/100 mm from the feed means 6 for convenience of processing. Moreover, the central hole is machined concentrically with respect to the outer periphery of the feed means 6. The shaft 12 is 5/100 to 20/100 smaller in diameter than its hole. Therefore, the feed means 6 is fixed to the shaft 1 with the set screw 13.
2, the outer periphery of the feed means is fixed to the shaft 12.
You will be eccentric and attached to it. For example, if there is a difference of 5/100 between the hole diameter and the shaft diameter, point B will be concave by 25/100 with respect to point A, and conversely, point D will be convex by 25/100 with respect to point A. Become. and C
Point and point A are at the same height as the outer diameter of the conventional feed means. Since the point where a sheet of paper is first taken in is point A, the characteristics around this area are the same as before, but when the feed means rotates in the direction of the arrow and reaches around B, the outer diameter of the feed means 6 is only 25/100. The position of the sheet is reduced, and therefore the braking force to which the sheet is subjected by the gate means 5 is also reduced. At this time, since the driving by the pick-up means 4 and the sheet conveying section 7 has already ended, it is more suitable to use a smaller braking force.

Next, the normal characteristics are restored again at point C, and furthermore, at point D, the convexity of the feed means becomes maximum, and the braking force on the sheet becomes maximum. Since we do not want paper sheets to be taken in at this timing, this increase in braking force is optimal.In this embodiment, we have described the eccentric mounting method, which is the easiest to manufacture. There is also a method in which the outer circumference of the feed means is machined by making it eccentric. However, the method using eccentricity has a limited 2 values with a maximum value and a minimum value.
Depending on the type of paper, the characteristics may not be sufficient because they are connected by a curved line.
It is also conceivable to partially provide protrusions or depressions. Therefore, it is not limited to eccentricity. Also, regarding the amount of runout when installing eccentrically, in the case of paper with a thickness of 0.1 mm, ±
Experimentally, good results have been obtained by vertically swinging the paper by 0.05, or about 1/2 of the paper thickness.

A second embodiment of the invention is shown in FIG. In Fig. 2, the entire feed means is shown eccentrically, but since it is difficult to process, the feed means is divided into a plurality of rollers as shown in Fig. 3, for example, two feed means near the center ( It is also possible to provide eccentricity only to the feed means on both sides (having no sheet conveying section 7) without eccentricity as in the conventional manner.

Further, the screw tightening phase is not limited to the position shown in FIG. 2, but better results can be obtained by further advancing the screw by about 45 degrees and setting it midway between points D and C, as shown in FIG. 3C.

FIG. 4 shows a third embodiment of the invention. In this embodiment, the outer periphery of the feed means is not eccentric, convex or concave, and the width of the groove facing the gate means is partially changed.

FIG. 5 shows a fourth embodiment of the present invention, in which the groove width in the embodiment shown in FIG. This is a method that achieves the same effect as in Figure 4. Here, the above method is used because the gate means 5 is inserted into the groove of the feed means 6, but if the feed means is inserted into the groove of the gate means, the width of the feed means may be changed. Alternatively, the amount of chamfering of the end face of the width portion of the feed means may be changed.

FIG. 6 shows a fifth embodiment of the present invention, in which the inertial energy of the pickup means is transferred to the brake roller 1.
4 and the brake plate 15, one end of the brake spring 16 is moved appropriately by the cam 18 attached to the feed means 6 and the cam floor 17, and the optimum braking force is applied to the pick-up means 4. It is intended to supply Of course, it is possible to configure the present invention in combination with the previous embodiments.

FIG. 7 shows a sixth embodiment of the present invention, in which a sheet braking member 20 provided on the front surface of the hopper is moved back and forth by a cam 19 provided on the feed means to apply an appropriate braking force to the sheet. supply. A method of applying braking using a vacuum suction port provided on the front side may also be considered as a method to obtain a similar effect. In this case, the braking force may be controlled by supplying and stopping vacuum suction.

FIG. 8 shows a seventh embodiment of the present invention, in which a braking force is applied to a sheet of paper by appropriately pressing an idling member 21 such as a bearing against a flat part other than the edge (near the chamfered part) of the gate means. be. In the conventional overlap-type separation device, only the edges of the gate roller were worn, while the center remained unworn. For this reason, when the gate roller wears out and the sheet braking force decreases, even if you try to supplement the braking force by tightening the overlap between the gate roller and feed roller, the center part will not return to its original shape. Therefore, if the overlap is made too tight, excessive warping will occur for stiff paper such as new banknotes, which may cause the paper to tear. However, as shown in this embodiment, if the braking force is exerted by pressing the sheet of paper against the grip of the gate roller, the entire gate roller will wear out, and the overlap value between the gate roller and feed roller may be reduced after long-term use. It becomes possible to fill up the amount by the amount of wear.

By the way, in order to control the braking force according to the rotational phase of the feed roller, as shown in FIG. It can provide sufficient braking force.
In addition, when releasing the braking force, slide part A2
5 is pushed back by the cam 22. The structure is such that the slide portion B26 is pushed back by the protrusion.

FIG. 9 shows an eighth embodiment of the present invention, which relates to a separating device having a structure in which the gate means 5 reverses its rotation in synchronization every time it separates one paper sheet. The structure is such that the means rotates once each time a sheet of paper is separated.

As in the case of the feed roller described above, the outer diameter of the gate means 5 is eccentric with respect to the gate shaft 27 so that an appropriate braking force can be obtained at each sheet separation timing. As in the previous embodiment, it is also possible to change the width of the gate means or change the amount of chamfering without making the outer diameter eccentric. Alternatively, it is also possible to control the pressing force of the idling member that presses against the gate means, as in the system shown in FIG.
Of course, the reversal speed of the gate means need not be limited to once per sheet, and can be selected appropriately depending on the quality of the paper.

〔Effect of the invention〕

According to the present invention, by appropriately decreasing or increasing the braking force of the gate means when feeding sheets by the feed means, it is possible to minimize the prevention of abrasion caused by the passing sheets of the gate means, and also to prevent erroneous feeding of subsequent sheets. Since the conflicting demands of prevention can be satisfied at the same time, even at high speeds, the operation is smooth, there are no malfunctions, and a stable and highly reliable separation operation can be obtained over a long period of time.

[Brief explanation of drawings]

FIG. 1 is a side view of a sheet processing apparatus equipped with a first embodiment of the present invention, FIG. 2 is a side view of a separation device of the first embodiment of the present invention, and FIG. FIG. 4 is a front view and side view of the feed means of the third embodiment of the present invention, and FIG. 5 is a front view of the feed means of the fourth embodiment of the present invention. FIG. 6 is a side view of a separating device according to a fifth embodiment of the present invention, FIG. 7 is a side view of a separating device according to a sixth embodiment of the present invention, and FIG. 8 is a side view of a separating device according to a sixth embodiment of the present invention. Example side and front views of a separation device,
FIG. 9 is a side view of a separating apparatus according to an eighth embodiment of the present invention. 1... paper sheet, 2, 3... hopper section, 4... pick up means, 5... gate means, 6... feed means.

Claims (1)

[Claims] 1. A hopper section that can set multiple sheets of paper,
A pick-up means for feeding the paper sheets one by one to a separation means, a gate means for applying a braking force to the paper sheets to prevent double feed, and a paper sandwiched between the gate means provided opposite to the gate means. and a feed means for feeding the leaves in the forward direction, the feed means having a roller shape and having a conveying portion with a high friction coefficient on a part of its circumferential surface, and having an eccentric center of rotation. The conveyor section of the feed means is rotatably mounted so that the radius from A paper sheet separation device characterized in that the braking force acting on the paper sheets before and after contacting the leaves and feeding the paper sheets changes continuously so that the braking force becomes maximum and minimum, respectively.