JPS58117566A - Paper feeding device - Google Patents

Abstract

PURPOSE:To offer always the copy which the user desires, by providing a paper quality discriminating means in the paper feeding part of a copying machine and comparing not only the paper size but also paper quality information and generating a selecting signal only for coincidence. CONSTITUTION:Papers are supplied to the copying machine from an upper-stage paper feeding part 1 and a lower-stage paper feeding part 2 by paper feeding rolls 3 and 4. Paper quality detectors 12 and 13 are provided for papers fed from the upper-stage paper feeding part 1 and the lower-stage paper feeding part 2. Paper quality detectors 12 and 13 consists of transmittance detectors, color detectors, and thickness detectors respectively. Information from not only paper absence detecting means 8 and 9 and paper size detecting means 10 and 11 of the upper-stage paper feeding part 1 and the lower-stage paper feeding part 2 but also paper quality detectors 12 and 13 are inputted to a controlling circuit 15 through a discriminating circuit 14. The controlling circuit 15 performs operation processings of these input information to output a cut signal 16, an upper stage paper feed signal 17, a lower stage paper feed signal 18, or the like as a control output signal.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic switching selection mechanism for a paper feed section in a copying machine having multiple stages of paper feed sections. In both case and case of cassette paper feeding, it is common to provide a plurality of paper feeding sections. In this case, in addition to switching and selecting paper of different sizes, if you set paper of the same size in multiple paper sources, and the selected paper source runs out of paper, the same size paper will be automatically matched. Various mechanisms have also been proposed for switching and selecting paper of different sizes from paper feed units.

However, today, the paper used as transfer paper is not only of different sizes, but also of different paper qualities.In other words, the thickness of the paper, the transparency of the paper, the color of the paper, etc. As a result, various options have come to be chosen. The thickness of paper is 55mm paper, 60KP paper...
・etc., and the transparency of paper is tracing paper, Mylar paper, etc.

Therefore, when automatically switching the paper feed section, if the switching is performed simply based on the information that the paper is of the same size, it has become a habit that copies can be made with a paper quality that is not requested by the user.

The present invention was made in view of the above circumstances, and
When paper fish is detected in the selected paper source, when automatically switching to another paper source, not only the paper size but also the paper quality information is compared, and a selection signal is generated only when they match. The aim is to always provide the user with the desired copy by doing so.

An embodiment of the present invention will be described below with reference to FIG. 1 and subsequent figures. 1st
The figure is a simplified configuration diagram showing a paper feeding section of a copying machine having a plurality of roll paper feeding sections. In the figure, numerals 1 and 2 are an upper paper feeding section and a lower paper feeding section, respectively, and paper is fed by paper feeding loaves 3 and 4.

Reference numeral 5 denotes a conveyance roller provided for the lower paper feed section 2, which has a long conveyance path. Reference numeral 6 denotes a cutter unit, and the paper cut here is further conveyed by conveyance rollers 7 toward a photoreceptor (not shown). , 8.9 is a known optical paper detection means provided facing the roll paper, and 10° 11 is also a known upper paper feed section 1 and lower paper feed section 2 for detecting the paper width in the conveyance path. A paper quality detector 12 and 13, which will be described in detail later, is provided for the paper fed out from the paper. FIG. 2 shows the overall configuration of this paper quality detector. (Both paper quality detectors 512 and 13 have the same configuration, so they will be described as paper quality detector 12 here.) In the figure, 12a is plain paper, tracing paper) - Paper types such as TA80, TA701 Mylar paper, OHP paper, etc. 12b is a color detector, and 12C is a thickness detector.

In this way, the paper quality detectors 12 and 13 are provided, and this paper quality information is also processed by the control unit along with the size information, and the paper size and
The switching nttn signal is output only when roll paper of the same quality is set in another paper feed section.

FIG. 3 shows such a control block circuit diagram. In the figure, the upper paper feed section! In addition to the paper size detection means 8, 9 and paper size detection means 10.11 of the lower paper feed section 2, information from the paper quality detector 12.13 is also input to the control circuit 15 through the determination circuit 14. There is. Of course, this control circuit 15 is designed to receive a paper feed roll selection signal for selecting either the upper stage or the lower stage, and after the control circuit 15 performs arithmetic processing on these input information, The cut signal 16 is used as a control output signal.
, an upper paper feed signal 17, a lower paper feed signal 18, etc. are output. The cut signal 16 is for operating the cutter unit 6, and the upper paper feed signal 17 indicates that the lower paper feed section 2 is selected. This is the signal that is output when paper of the same size and quality is set.

The lower paper feed signal 18 is a signal in the completely opposite case. FIG. 4 specifically shows the transparency detector 12a of the paper quality detectors. (1) is a vertical cross-sectional configuration diagram, in which the number of facing light emitting elements 19 and light receiving elements 2o is ++t L
, through which the roll paper is passed. Figure (b) is a circuit diagram, in which operational amplifiers OPI, OPI
, OP) standard voltage for plain paper, tracing paper, OHP sheet V1. V*.

It is set to v3. Now, the resistance value of the light receiving element 20 is high, that is, the transparency of the paper is low (in the case of plain paper) A
If the voltage at the point is only slightly higher than Vl, the output of operational amplifier OP3 is Ij, and the output of inverter h is H, so an output is output from AND gate AS, and plain paper is detected. Similarly for tracing paper and OHP sheets, use ANDGATE A! , CC) in the same figure is a graph showing the relationship between the reference voltage and the transmittance of paper. Figure 5 is a graph for explaining the color detector 12b in detail; a) is a longitudinal sectional view. In the figure, a light-emitting element 19 and a light-receiving element 20 are provided identically on the paper, and each woodcutter filter 21 is provided on the surface of the light-receiving element 200. This filter 21 is, for example, t1 red, etc.
This is a well-known type that only passes light of the wavelength of that color. In the case of plain paper, there is no need to provide a filter. Same figure (b)
is a color adaptation circuit diagram, and the reference voltages corresponding to blue, red, and white (plain paper) are operational amplifiers, OP+, OPs, O
Ps, the detected paper color is applied to the filter 21 to obtain an output, and the AND gate ^1. Directly from A1 or operational amplifier OP>
It outputs a color detection signal.

Further, FIG. 6 shows the thickness detector 12C in detail, and FIG. The slit plate 23 is configured to rotate in the direction of the arrow in accordance with the force of the user.The slit plate 23 is provided with a hole 23a. The same figure (b
) is a side view, and as can be seen from the figure, a light emitting element group 19 and a light receiving element group 20 are provided so as to sandwich this slit plate 23. It is sufficient to output the status as a BCD code and detect the paper thickness. FIG. 6(C) shows a detection circuit, and in this way, it is possible to detect eight different thicknesses of three bits by combining the outputs obtained from the light receiving elements 20a, 20b, 20c, and 20d.

In a copying machine that has a control unit that can automatically switch between these paper feed units, it determines not only the size of the paper in the selected paper feed unit but also the paper quality information and selects the same size. , the paper feed section in which paper of the same quality is set is selected.

Therefore, it is possible to always provide desired copies in response to the diversifying needs of users.

[Brief explanation of the drawing]

Fig. 1 is a simplified configuration diagram showing the paper feed section of a copying machine, Fig. 2 is an overall perspective view of the main parts of the present invention, Fig. 3 is a control block diagram, Fig. 4 (a), (bL (C) 5(a) and (b) are longitudinal sectional views and circuit diagrams of the color detector, and FIGS. 6(a), (b), (C ) respectively show a perspective view, an 11th view, and a circuit diagram of the thickness detector. 1.2... Paper feed section, 8, 9... Paper fish detection means, 10.11. ...Paper size detection means, 1
2.13...Paper quality detection means 3,

Claims (1)

[Claims] (+) In a copying machine provided with a number of paper feed sections and equipped with a paper size detection means and a paper size detection means, the paper quality such as paper thickness, paper transparency, paper color, etc. is detected. A paper quality detection means and a judgment circuit for determining the output of this paper quality detection means are F&
When paper is detected in the paper feed section selected by the section selection signal, the size and quality of the paper set in other paper feed sections is compared with the size and quality of the paper that was not selected. , a control circuit for inputting a control signal for selecting a new paper feeding section to a paper feeding section selection means when the two match. (What is claimed is that when a paper fish detection is performed, the paper feeding operation is stopped if there is no other paper feeding section in which paper of the same size and quality is set. Paper feeding device as described in section.