JPH05201558A - Load control device in feed mechanism - Google Patents

Abstract

PURPOSE:To stabilize the conveyance under frictional drive by converting a vertical displacement of a pick-up roller measured in an analog value, into a load value, and by controlling the conveyance so that the load with which optimum frictional drive can be carried out in accordance with a kind of a material to be conveyed. CONSTITUTION:A pick-up roller 2 is pressed by a load P, the displacement of the roller 2 is detected by a detecting means 5 in which a strain gage 5a is applied on a cantilever beam 5 so that the movement of the pick-up roller 2 is converted into a flexion of the beam 5b and is detected in an analog value. A control part 6 is binary-codes an image obtained by amplifying an output of the strain gage 5a through the intermediary of an A/D converter 6a, and delivers its output V0 which is converted into a load Pn by means of a computing part 6b. Meanwhile, a memory part 6c stores therein a load Ps which from which a frictional coefficient optimum for paper feed is obtained in accordance with a kind of a material I to be fed. Further, a load control part 6d control the load P so that the calculated load Pn becomes equal to the load Ps which is read from the memory part 6c in accordance with an instruction from a setting part 6e in accordance with the kind of the material to be fed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load control device in a feed mechanism, which reads the vertical movement of a pick roller in an analog amount and converts it into a load, which enables optimum friction drive according to the type of a conveyed object. The present invention relates to a load control device in a feed mechanism that can control the load.

In recent years, with the spread of information processing technology in various fields, an increasing number of devices handle paper-based media (hereinafter referred to as base paper). For example, printers, copiers, and the like carry out printing and printing by feeding a printing paper, which is an object to be conveyed. In addition, a CD (cash payment machine), a money changer, and the like handle bills having an object to be conveyed while feeding them. In such an apparatus that handles base paper such as a printer, the paper may be a form in which the paper is preliminarily stacked or a long continuous paper, but in many cases, the paper is fed in the form of a sheet (cut sheet).

In general, sheets are fed one by one, but it is difficult to make the end faces abutt because of their small thickness. For this reason, the paper feeding of the base paper is troublesome because it cannot be caught, unlike continuous paper that is sent by engaging a sprocket with a feed hole. Therefore, a method is adopted in which the base paper is held and sent by vacuum suction or mechanical gripping. However, as a simpler method, a friction drive (friction drive) is often used in which an object to be conveyed is sandwiched between rollers and the paper is fed using friction between the object to be conveyed and the roller.

By the way, in a device for feeding paper, the occurrence of a problem relating to paper feeding causes the operation of the device itself to stop, so it is an important issue how to reduce the problem. In the case of frictionally driven paper feeding, it is desired to reduce problems such as a feeding failure in which the paper is not fed and a double feeding in which a plurality of base sheets are fed in a pile.

[0005]

2. Description of the Related Art FIG. 2 is a schematic explanatory view of an example of a conventional paper feeding mechanism. 1 is an object to be conveyed, 2 is a pick roller, 3
Is a conveying roller, 4 is a separating roller, 5 is a detecting means, 5c is a lever, and 5d is a photoelectric switch.

In the figure, the object to be conveyed 1 is a kind of base paper having so-called paper as a base material. Then, the paper feeding by the friction drive is performed by the coefficient of friction between the stacked conveyed objects 1,
The difference in friction coefficient between the conveyed object 1 and the pick roller 2 for feeding the paper is utilized. That is, if the friction between the transported object 1 and the pick roller 2 is made larger than the friction between the transported objects 1, the transported object 1 is fed by the rotation of the pick roller 2. Therefore, in order to increase the friction coefficient of the pick roller 2, a rubber-coated roller is generally used.

Objects to be conveyed 1 are stacked on the pick roller 2, and are rotated by a pulse motor or the like according to the required number of objects to be conveyed 1 for paper feeding. The conveyed object 1 fed forward by the pick roller 2 is delivered to the rotationally driven conveying roller 3. The conveyed objects 1 are separated one by one by a separation roller 4 that elastically contacts the conveying roller 3 and sent out.

By the way, a rubber roller is used as the pick roller 2 so as to increase the friction with the object to be conveyed 1. However, the friction between the objects 1 to be conveyed and the pick roller 2 and the object to be conveyed are increased. The degree of friction with 1 varies depending on the load P to which the weight of the stacked conveyed objects 1 themselves is added. When the load P increases, not only an abnormal load is applied to the drive system such as the pick roller 2, but also the coefficient of friction between the conveyed objects 1 increases, and for example, a plurality of conveyed objects 1 are simultaneously fed. For example, the paper may not be fed normally.

Therefore, the pick roller 2 is urged and supported upward so as to elastically contact the transported object 1 while appropriately absorbing the load P applied through the stacked transported objects 1. That is, the pick roller 2 is moved up and down by the load P, and this movement is
It is adapted to be detected by the detecting means 5 attached to the.

The detecting means 5 comprises a lever 5c and a photoelectric switch 5d. The vertical movement of the pick roller 2 is first caught by the lever 5c, and the preferable upper and lower limits of the load P are detected by the photoelectric switch 5d from the movement of the lever 5c. Although not shown, for example, the load for mechanically pressing the transported object 1 is controlled.

[0011]

By the way, according to the detecting means 5 for mechanically and fixedly setting the upper limit and the lower limit of the load P, the type of the base paper as the transported object 1 is different,
When the friction coefficient or the grammage (weight per square meter indicating the thickness of the paper) is changed, the upper limit and the lower limit of the load P change, and a paper feed problem sometimes occurs. However, the conventional feed mechanism has a problem that the set value cannot be easily changed.

In view of this, the present invention reads the vertical movement of the pick roller by an analog amount, converts it into a load, and controls it so that the load can be optimally frictionally driven according to the type of the conveyed object. The purpose of the present invention is to provide a load control device.

[0013]

SUMMARY OF THE INVENTION The above-mentioned problem is solved by elastically contacting a plurality of stacked sheet-like conveyed objects pressed by a load P from below and frictionally driving the conveyed objects. A pick roller that feeds the sheets one by one, a conveying roller that is arranged in front of the pick roller to convey the conveyed object, and a separation roller that elastically contacts the conveying roller to separate the conveyed object one by one. A detection unit configured to detect the vertical movement of the pick roller in an analog manner, and a control unit configured to control a load P applied to the transported object according to the output of the detection unit, wherein the control unit outputs the output of the detection unit. An A / D converter for binarizing, a calculation unit for calculating a load P _n from the output of the A / D converter, and a storage unit for storing an optimum load P _s corresponding to the transported object, load system for controlling the load P to be load P _n = load P _s It is solved by the load controller in configured feed mechanism as those having a part.

[0014]

In the load control device in the friction drive of the conventional paper feeding mechanism, setting the load is difficult when the type of the transported object is changed, but in the present invention, it is easy to change the transported object. I am able to deal with.

That is, the amount of movement of the pick roller which moves up and down by the load P is detected in an analog manner. Then, the optimal load P analog amount by binarizing calculates the load P _n, the load P _n is corresponding to the conveyed object
_s and the load P is always controlled so that the load P _n = the load P _s .

Then, even if the type of the transported object is changed, by selecting the load P _s corresponding to each transported object, the load P can be controlled so as to be always the optimum load P, so that stable friction can be achieved. Drive can be realized.

[0017]

FIG. 1 is a schematic explanatory view of an embodiment of the present invention. In the figure, 1 is an object to be transported, 2 is a pick roller, 3
Is a conveyance roller, 4 is a separation roller, 5 is a detection means, 5a is a strain gauge, 5b is a cantilever, 6 is a control unit, 6a is an A / D converter, 6b is a calculation unit, 6c is a storage unit, and 6d is The load control unit, 6e is a setting unit.

A sheet-like object 1 to be conveyed such as a sheet is
Plural sheets are stacked on the pick roller 2 and are in elastic contact with each other. Then, the weight of the object to be transported 1 is applied and pressed by the load P. The conveyed objects 1 are frictionally driven one by one by the rotation of the pick roller 2 and pulled out. At that time, the plurality of conveyed objects 1 that are about to be pulled out by the friction between the conveyed objects 1 are separated one by one by the separation roller 4 when being transferred to the conveying roller 3.

When the pick roller 2 is pushed down by the load P, the detecting means 5 detects the movement of the pick roller 2. The detecting means 5 has a structure in which a strain gauge 5a is attached to a cantilever 5b, and the movement of the pick roller 2 is converted into the bending of the cantilever 5b so that the amount of bending is detected in an analog manner. I have to.

The control unit 6 amplifies the output of the strain gauge 5a and binarizes it through the A / D converter 6a. Then, the output V ₀ of the A / D converter 6a is applied to the load P by the calculation unit 6b.
Convert to _n . That is, the load P _n = kV ₀ (k: constant). The load P _n is the overlapped object 1
It is a value that fluctuates every moment depending on the amount of.

On the other hand, the storage unit 6c stores a load P _s corresponding to various types of the conveyed object 1 so as to obtain an optimum friction coefficient that does not cause a problem in paper feeding. Then, in the load control unit 6d, the load P calculated by the calculation unit 6b
_The load P is controlled so that _n is the optimum load P _s read from the storage unit 6c according to an instruction from the setting unit 6e according to the type of the transported object 1.

Here, a strain gauge is used as a detecting means for the purpose of detecting the vertical movement of the pick roller in an analog manner. However, there are means for optically and magnetically detecting, and various modifications are possible. ..

[0023]

According to the present invention, the load applied to the stacked conveyed objects is controlled to be the optimum load for friction drive. Moreover, when the type of the base paper of the transported object changes, the setting can be easily changed so that the load corresponds to each transported object.

As a result, the present invention contributes to obtaining stable operation performance of an apparatus that conveys by friction drive among apparatuses that handle various base papers that are expected to increase more and more in the future. However, it is big.

[Brief description of drawings]

FIG. 1 is a schematic explanatory diagram of an example of the present invention.

FIG. 2 is a schematic explanatory view of an example of a conventional paper feeding mechanism.

[Explanation of symbols]

1 Transported Object 2 Pick Roller 3 Transport Roller 4 Separation Roller 5 Detection Means 5a Strain Gauge 5b
Cantilever 6 Control part 6a A / D converter 6b
Calculation unit 6c Storage unit 6d Load control unit 6e
Setting section

Claims (2)

[Claims] 1. A plurality of sheet-like conveyed objects (1) placed one on top of the other that are pressed by a load P are elastically contacted from below and the conveyed objects (1) are fed one by one by friction drive. A pick roller (2), a carrying roller (3) arranged in front of the pick roller (2) for carrying the carried object (1), and the carried roller (3) elastically contacting the carried roller (3) A separating roller (4) for separating the objects (1) one by one, a detecting means (5) for detecting the vertical movement of the pick roller (2) in an analog manner, and an output of the detecting means (5) It has a control unit (6) for controlling the load P applied to the conveyed object (1), and the control unit (6) binarizes the output of the detection means (5) to an A / D converter (6a). And a calculation unit (6b) for calculating the load P _n from the output of the A / D converter (6a), and a storage unit (6c) for storing the optimum load P _s corresponding to the transported object (1). And load P _n = load P _s A load control device in a feed mechanism, comprising a load control section (6d) for controlling the load P. 2. The load control device for a feed mechanism according to claim 1, wherein the detection means (5) is a strain gauge.