JPS5964449A - Sheet transport sensing device - Google Patents

Abstract

PURPOSE:To have accurate sensing of abnormal transport by reading an identification means provided in that one of the sheets loaded in a copying machine etc. which lies in a specific position in the order and by using the period of time, from sensing of this specific sheet by a transport sensor till sensing and outputting by an identification sensor. CONSTITUTION:When a transpot sensor S1 senses the leading edge of a specific sheet P and resets a timer 13, counting will commence, and upon awaiting attainment of the value corresponding to the reference time by this counted value, the output of an identification sensor S2 shall be read and entered at this timing. If the dientification sensor S2 senses the hole 7 at this timing, it is known that treatment of transcript sheets is in good order and that the transport is being made at normal speed. If on the other hand the identification sensor S2 does not sense the hole 7 at this check timing, it is judged that double feed is being made or that the tranport is at an abnormal speed. Now an error signal 14 will be placed out. According to this arrangement, accurate sensing is obtained with a simple mechanism to ensure that occurrence of double feed is well prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper conveyance detection device in a copying machine ζ.

In particular, the present invention relates to an improvement in a paper transport detection device for paper sheets (copy paper) such as slips that are made up of a plurality of sheets.

In general, delivery slips and honorable mention slips used in shops, department stores, etc. consist of one for submission to the recipient, one for attaching the product, one for copies, and others, and cost 1 $115 to 7 sheets and 1) to 1'. [Often.

When making large copies of original documents with product names, customers, addresses, etc. written on such documents, the documents are fed into the paper transport path inside the copying machine, but in this case,
When double feeding occurs, not only the required number of sheets in i-in is missing, but also the order in which the slips are conveyed is thrown out of order, resulting in a shift in the desired copy content, which is bound to cause inconvenience.

Many double-feed detection devices have been proposed in the past, but they are difficult to detect when paper thickness is extremely thin or transparency is high or low. Who was the official?

The present invention provides the following features:
A paper transmission inspection button device 1 that reads identification means such as notches and accurately detects whether the copy paper is being conveyed in the normal conveyance order using a simple mechanism.
': The purpose is to provide.

One embodiment of the present invention will be described below with reference to the drawings.

No. 11 is an explanatory diagram showing the paper conveyance path of the hakama copying machine.

In the figure, ] is a paper feed tray containing copy paper, 2 is a paper feed roller, 3 is a conveyance roller, and 4 is a registration roller. The arrow indicated by 5 indicates the paper transport path h'l, the paper advances along the S- paper transport path 5, and the transfer drum 6 transfers white to +:
Di is photographed. Then, between the conveyance roller 3 and the registration roller 4, there is a conveyance sensor +31 which will be described later.7.
1'λ separate sensor S is provided. Indicated by a mark, /s-
These sensors S and Sl are known paper sensors.

21st: <l is 13iJ Note 147 Send 9-3
, identification sensor st and specific paper P position 1t7. It is an explanatory diagram showing a relationship.

lj! In this case, the separate means for the fixed paper P is constituted by holes 7. The holes 7 are constant in the X direction, but in the X direction, /1'r from the leading edge to the trailing edge of the fixed paper P are several blocks (1, 2...l ~ 1, /) A value of 1m/m is specified depending on which of these corresponds. Then, the detectability (+jj) of the hole 7 is determined at this predetermined block position f (j:. No problem.

In the figure, the direction of the arrow indicates the direction in which the copy paper is conveyed.

Copy paper is fed one by one in the direction of the arrow according to the order of processing 11, but this specific paper P reaches the position IL):>feed sensor S8 at a predetermined time.

The conveyance sensors S I X iQ are arranged perpendicularly to the direction of the conveyance note, that is, parallel to the y-axis.

On the other hand, since the identification sensor S must detect the hole 7 as described above, it is provided on the extension line of the hole 7 in the X-axis direction.

Then, when the conveyance sensor S detects the leading edge of the specific paper P,
The timer is now counting. Under normal conveyance conditions, the time until this hole 7 reaches the identification sensor S is counted as the reference time, and recorded in the notes 1 to be described later.
．． (It is stored in group S. The output of identification sensor S is checked at the timing of this reference time, and if hole 7 is detected, it means that the conveyance is normal. Conversely, if hole 7 is not detected, then the output of identification sensor S is checked. This means that there is an abnormality.In this case, the identification sensor S will detect a change in transmission (if the identification sensor S is 11, the output signal will be from low level when detecting hole 7). On the other hand, if it is a reflective type, the hole 7 will be detected by the change in output from high level to low level.

FIG. 3 is a block diagram of a detection circuit according to the present invention.

In the figure, 8 is the 21 control switch, and 1
V'0 along with the outputs of the transportation sensor Sr and the identification sensor S.
Information is input to a CPU (central control unit) 10 via a boat 9. 11 to It O 1.12
are connected to CP [Jlo by data bus and address bus. 13 is cpux
The external timer 14 of o is the error (i) output from the VO boat 9, and is the conveyance abnormality detection output.

The control switch 8 moves from the number of copies of one set of copy sheets arranged in the order of processing 11i1, the number of sheets of specific paper P, and the leading edge of the specific paper to the above-mentioned reference time (which is the normal conveyance time of the distance at (t7-!) (This can also be considered as the position information of L7) is read into Cl) U 10 as a binary signal.

In such a system configuration, after turning on the power, the various information mentioned above is obtained from the control switch 8.
PU10 is waiting for the 1i17 report from the transport sensor S□. This conveyance sensor S outputs a detection signal not only when it detects the specific paper P, but also when it detects the tip of other copy paper, but as mentioned above, the number of sheets of the specific paper P is stored. Therefore, it is sufficient to capture the output of the conveyance sensor S when the leading edge of the copy paper corresponding to the number of copies +1 is detected.

When this conveyance sensor 5II)' detects the leading edge of the specific paper P and turns on, the timer 13 is reset.
.

Start counting. Then, when this count value reaches the value corresponding to the above-mentioned reference time, it is only necessary to read the output of the edict/kobetsu sensor St at this timing.
←、ru.

If, at this timing, 1 & another sensor S detects the hole 7, the detection output in this case is as described above, 15) + (1 :high level,
If it is a reflective type, it will be a low level), and it will be determined that the processing 111 of one sheet per sheet is performed without any errors, and that the conveyance i.times.1 (low level) is normal.

If at this goonic timing, the identification sensor S,
1.■ (Feeding is occurring, A)) B) Or, even if the feeding is not occurring, the conveying speed is bl, S'7. ``Since there is an i,
In this case, error 14 is output.

Figure 284 is a timing chart showing this series of operations.

S i'r(]I' l Ic , l; 5 ti7
-211 Human power refers to the various types of information described above from the control switch 8. Yo7ko STE!
' Sl ON in 2 is an ON output when several copies of the specific paper P reach the conveyance sensor S.

When this output occurs, the timer 13 starts counting at step 11, as described above. Then, in S'I' E P 4, *l; 'r'i transmission error error check, i.e. t), l'i'l '3+1-glue,
(Whether or not hole 7 was detected at the time timing)
If 'l'U is disconnected and transport-1I'4 is normal, S i
' The error signal 14 is output at EP 5.

Book I 11 is II, 1 arranged in processing order as above
Group paper 1i'? ■I'>Invoice i) of ff>1, when detecting 1, 'l! 1" of fixed paper (I judge whether the number [1 is correct by detecting the identification means provided on that specific paper l-1) Moreover, it is also possible to know the position of the identification means on the 11"r fixed paper. Therefore, even if similar holes, marks, etc. are used on this particular paper for other purposes, it has a ta ti' that allows it to be distinguished.

[Brief explanation of drawings]

Fig. 111 is an explanatory diagram showing the paper jj (y feed path) in a copying machine, Fig. 2 is an explanatory diagram showing the arrangement of the senna according to the present invention, Fig. 3 is a diagram showing the system pro 7 according to the present invention, and Fig. 4 The figure is a flowchart of the same operation; 7...hole as a means of occupation, P.../
l'￥Steigami, S.・・・・・・l::'2 Sensing S... Eyes... Identification sensor. Fig. 1 Fig. 2', 2-----l-l Fig. 3 Fig. 4

Claims (1)

[Claims] 1t1 of small (2 or more) arranged in processing order
One of the paper 'J+I M' designated as 1 is designated as a specific paper provided with an identification means, and by detecting the identification means of this specific paper with a sensor, an abnormality in the process 11 Jlli'f order can be detected. J6, the normal transport time from the leading edge of the specific paper to the identification means is taken as the reference time, and this reference time +10. The present invention is designed to detect the presence or absence of a conveyance abnormality by comparing the time from when the leading edge of a specific paper is detected by a conveyance sensor to when a detection output is generated by an identification sensor for detecting an identification means. Characteristic paper conveyance detection device.