JPH0568994U - Paper sheet transport error monitoring device - Google Patents

Abstract

(57) [Summary] [Purpose] To perform highly reliable conveyance error monitoring regardless of the presence or absence of slipping pieces at the leading or trailing edges of paper sheets. [Constitution] In a device that detects a passage time of a sheet 1 with one sensor 2 and detects a transport error based on comparison with a reference passage time, the sensor 2 detects the front end and the rear end of the sheet 1. After that, the change of the sensor 2 is ignored during each predetermined pitch.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a transport error monitoring device for paper sheets transported by a transport means in a transport path.

[0002] A paper sheet conveyed along a conveying path by a conveying means such as a roller or an endless belt may cause a conveying error such as a jam due to a slip or a curl between itself and the conveying means or a tip break.

When such a transport error occurs, various processes in the next process on the downstream side in the transport direction cannot be performed, and a transport error of the succeeding paper sheet may be induced. Therefore, the transport is always performed. It is necessary to monitor the error and stop the transportation when the transportation error occurs.

As a well-known paper sheet conveyance error monitoring device, a sensor for detecting the leading end and the trailing end of a conveyed paper sheet is arranged in the conveyance path. There is a type that detects a conveyance error of a sheet by comparing the detected passage time of the sheet with a predetermined reference passage time.

The above-mentioned reference passage time is calculated from the length of the paper sheet in the transportation direction and the transportation speed of the transportation means.

FIG. 3 is a flow chart showing the monitoring contents of a conventional example of the above-described transport error monitoring device.

First, the motor is driven to convey the sheet (medium) by the conveying means (S1). When the sensor detects the leading edge of the sheet (Y in S2), the motor continues to be driven (S3), and the jam monitoring counter is incremented by 1 (S4). When the sensor detects the trailing edge of the sheet (Y in S5), the value x of the jam monitoring counter is determined (S6).

Here, x is the time required for the paper sheet to pass through the sensor (the above-mentioned passage time), which is an allowable upper limit value n compared with the reference passage time._TwoAnd the allowable lower limit n ₁ If it is in the interval (Y in S6), it is determined that the paper sheet is normally conveyed, and the process returns to step S1 to move to the processing of the next paper sheet.

On the other hand, when the counter value x is larger than n ₂ or smaller than n ₁ , on the other hand, the conveyance error (jam error) process is performed (S7). Specifically, it stops the motor of the transportation system and displays that a transportation error has occurred.

[0010]

[Problems to be solved by the device]

 However, as shown in the part (a) of FIG. 4, there is a blurring piece 1 a at the tip of the paper sheet 1, or at the rear end of the paper sheet 1 as shown in the part (b) of FIG. When the shake piece 1b is present, the sensor (photosensor) 2 detects the shake piece 1a, 1b as the leading edge or the trailing edge of the paper sheet 1 to misidentify the passage time of the paper sheet 1. There was a risk of doing it.

For this reason, even if the paper sheet 1 simply has the shake pieces 1a and 1b, the value x of the jam monitoring counter will increase even though the paper sheet 1 is actually conveyed normally. There is a case where it is erroneously detected as a paper sheet transportation error, and in that case, there is a problem that dead time occurs due to the stop of the operation of the transportation system.

An object of the present invention is to solve the above-mentioned drawbacks of the prior art and to perform highly reliable conveyance error monitoring regardless of the presence or absence of a slipping piece at the leading edge or the trailing edge of a paper sheet.

[0013]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention is provided with a control means for detecting the leading edge and the trailing edge of a paper sheet by the sensor and then ignoring the change of the sensor during the transport of a predetermined distance. It is characterized by that.

[0014]

[Action]

 If the front end of the paper sheet 1 has a blurring piece 1a protruding forward, the sensor 2 first detects the blurring piece 1a prior to the front end of the paper sheet 1.

Similarly, if there is a blurring piece 1b projecting to the rear of the rear end of the paper sheet 1, the sensor 2 detects the rear end of the paper sheet 1 and then again detects the blurring piece 1b. I will detect it.

However, after the sensor 2 detects the leading edge and the trailing edge of the paper sheet 1, the change (on, off) of the sensor 2 is ignored while the sensor 2 conveys a predetermined distance (n pitch).

[0017]

【Example】

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

FIG. 1 is a control block diagram of the transport error monitoring device. In the figure, 2 is a sensor, 3 is a CPU (control means), 4 is a motor driver, 5 is a motor for driving a conveying means (not shown), and 6 is a display unit.

The output level of the sensor 2 changes from the state before that until the trailing edge of the paper sheet 1 shown in FIG. 4 reaches the trailing edge (for example, in the case of a reflection type sensor). (From OFF to ON, and from ON to OFF in the case of a transmissive sensor), this level change detects the transit time in the CPU 3 and compares it with the reference transit time to detect the transport error. There is.

If the CPU 3 determines that there is a transport error, a stop command is issued to the motor driver 4 to stop the driving of the motor 5, or a warning display command is issued to the display unit 6.

Next, the actual control contents in consideration of the presence of the blurring pieces 1a and 1b shown in FIG. 4 will be described based on the flow shown in FIG.

When the motor 5 is driven (S11) and the leading edge of the paper sheet 1 (there is a case where there is no blurring piece 1a or there is a case where it is present) (Y in S12), the motor 5 is continuously driven. (S13), the sensor change neglect counter is incremented by 1 (S14). Then, when the number of pitches n to be ignored (see FIG. 4) has been reached (Y in S15), the jam monitoring counter is incremented while driving the motor 5 (S16) for the first time (S17).

Similar to the flow shown in FIG. 3, when the trailing edge of the paper sheet 1 is detected (Y in S18), it is determined whether the jam monitoring counter value x is within the allowable range, and if not, it is determined. (N in S19), error processing is performed (S20).

Here, even if the jam monitoring counter value x is within the allowable range, it does not immediately return to step S11 as in the conventional example, but the sensor change neglect counter is driven while driving the motor 5 (S21). The value is incremented (S22), and when this value reaches the above-mentioned negligible pitch number n (Y in S23), the process returns to step S11.

In this way, erroneous detection of the transit time of the sensor 2, in other words, the value of the jam monitoring counter due to the presence of the blurring pieces 1a and 1b at the front or rear end of the paper sheet is prevented. .

[0026]

[Effect of the device]

 As described above, according to the present invention, even if there is a shredded piece at the leading edge or the trailing edge of the paper sheet, the change in the sensor due to this is ignored, so that the paper sheet always passes accurately. The time can be detected, and highly reliable transfer error monitoring can be performed.

[Brief description of drawings]

FIG. 1 is a simplified control block diagram of a conveyance error monitoring device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing the control contents.

FIG. 3 is a flowchart showing the contents of a transport error monitoring control according to a conventional example.

FIG. 4 is a diagram showing a state in which a sensor detects a swaying piece at the front and rear ends of a paper sheet.

[Explanation of symbols]

 1 Paper Sheets 1a, 1b Broken Piece 2 Sensor 3 CPU 4 Motor Driver 5 Motor 6 Display

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Yoshikazu Hirashiki 570, Ohito, Ohito-cho, Takata-gun, Shizuoka Prefecture Tokyo Electric Co., Ltd. Ohito factory

Claims (1)

[Scope of utility model registration request] 1. A sensor for detecting a front end and a rear end of a sheet to be conveyed is arranged in a conveying path of the sheet to be conveyed by a conveying unit driven by a motor. In a paper sheet conveyance error monitoring device that detects a paper sheet conveyance error based on a comparison between a paper sheet passage time and a predetermined reference passage time, a sensor is used to detect the front and rear edges of the paper sheet. A paper sheet conveyance error monitoring apparatus comprising: a control unit that controls so as to ignore a change in the sensor while the sheet is conveyed by a predetermined distance.