JPH03284961A - Printing device - Google Patents

Abstract

PURPOSE:To minimize the frequency of error processing by an operator by providing at least, one or more sheet end sensors at a fed sheet transport mechanism and a discharged sheet transport mechanism, interpreting which sheet end sensor detects an abnormal sheet transport, and allowing either one of the mechanisms to retry without stopping it regardless of such an abnormal sheet transport state depending on the interpretation results. CONSTITUTION:A main control part 10 interprets which one of a fed sheet end sensor S1 or a discharged sheet end sensor S2 has detected an error and determines a site where an abnormal sheet transport state occurs. In addition, if a state 'sheet empty' is discovered as a result of an output from the fed sheet end sensor S1, sheet feed is retried at a specified frequency, for example, 2 to 3 times without stopping a fed sheet transport mechanism I, although the state is 'sheet empty'. If nevertheless an error detected by an output from the fed sheet end sensor S1 is cancelled, the fed sheet transport mechanism I is stopped. After the completion of switching of the fed sheet end sensor S1, a fed sheet transport mechanism II is stopped, if the discharged sheet end sensor S2 is not switched. However, after the switching of the discharged sheet end sensor S2, a discharged sheet transport mechanism III functions in such a way that it retries at a specified frequency, if the switching operation is not completed even after the lapse of a specified time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a printing device, and more particularly to a printing device equipped with a plurality of sensors for detecting an abnormality during paper travel within the printing device.

[Conventional technology]

2. Description of the Related Art Conventionally, in many printing apparatuses, a paper end sensor is provided in each transport mechanism to detect the feeding and ejecting movements of paper.

If the paper end sensor detects an abnormality in paper running, it is configured to immediately determine whether the paper is jammed or empty, display an "error" message on the display, and stop each running mechanism. There is.

[Problem to be solved by the invention]

On the other hand, in recent years, there has been a marked increase in the amount of printing.
-The amount of printing per sheet of original document is also increasing.

For this reason, it has become common practice for the user to leave the printing device and do other office work after performing a printing operation.

In such a case, when a paper jam or empty paper occurs, the printing device displays an "error" message on the display and sets each traveling mechanism to a stopped state. This state continues until the operator resolves the "cause of the error."

Therefore, when the printer arrives at the printing device in anticipation of printing completion, it often happens that the task of resolving the "cause of the error" becomes a priority task.

If the traveling mechanism stops like this, it may not be resolved unless the operator proactively resolves the paper jam or replenishes the paper, but on the other hand, if the traveling mechanism continues to run, it may cause an "error". may resolve itself, and it is often not the best solution to forcibly stop the traveling mechanism completely.

[Purpose of the invention]

The present invention improves the disadvantages of the conventional example, and in particular, takes a method of causing the paper to run and eject several times even after an error is detected, thereby reducing the degree to which the apparatus is stopped. The objective is to provide a printing device with reduced number of printers.

[Means for solving problems]

In the present invention, a paper feed running mechanism section and a paper discharge running mechanism section are provided via the printing mechanism section, and a paper edge detection sensor is provided in each of the paper feeding drive mechanism section and the paper discharge running mechanism section; The main controller is provided with a main control that is activated immediately upon input of an abnormality detection signal from each sensor to stop the paper feed traveling mechanism. Furthermore, a paper counter that is started or stopped under the control of a paper feed traveling mechanism section and a main control section is provided.

The main control unit has a counter start control function that activates the paper counter with priority over stop control for the paper feed traveling mechanism when an abnormal signal sent from the paper edge sensor is input, and a paper counter that operates the paper counter for several sheets. The stop control delay output function immediately activates the stop control function for the paper feed traveling mechanism if an abnormal signal from the paper end sensor is input even after the time for counting printing paper has elapsed. It employs a mechanism called This aims to achieve the above-mentioned purpose.

[For production]

In the printing device of the present invention, if any one of the paper edge sensors provided in each of the paper feed traveling mechanism and the paper discharge traveling mechanism detects an abnormality, the paper feeding, paper traveling and Paper continues to be ejected. If an abnormality signal is still sent from the sensor after that, the main control section temporarily controls the paper feed traveling mechanism section, the paper discharge traveling mechanism section, etc. to stop.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In the embodiment shown in FIGS. 1 and 2, the printing mechanism section I
A paper end detection sensor S1. S2, and a main control section 10 that operates immediately upon input of abnormality detection signals from these sensors to control the stoppage of the paper feed traveling mechanism section I.

The paper feed traveling mechanism section H is equipped with a paper counter 11 that is started or stopped under the control of the main control section 10. This main control section 10 is configured to control one of the paper edge sensors 31 . A counter start control function that activates the paper counter 11 with priority over the stop control of the paper feed traveling mechanism section (■) when an abnormal signal sent from S2 is input, and the paper counter 11 counts several sheets of printing paper. Even after the time has elapsed, the paper edge sensor 31. It also has a stop control delay output function that immediately activates the stop control function for the paper feed traveling mechanism when an abnormal signal from S2 is input.

To explain this in more detail, the embodiment shown in FIGS. 1 and 2 has a paper hopper 2 that stores paper 1,
EP cartridge 3 for further printing, transfer device 4,
Furthermore, a fixing device 5 for fixing the printed paper, a paper feed roller 6 for feeding and running the paper, and a registration roller 7
, and a discharge roller 8 for discharging and running the paper.

The paper feed traveling mechanism unit (2) functions to feed the paper 1 by the paper feed roller 6 and cause the paper to travel to the fixing device 5 via the registration rollers 7. In order to manage this paper running, a paper feed end sensor S1 is arranged near the registration roller rough. Further, the paper ejection traveling mechanism section (2) operates to cause the paper to travel from the fixing device 5 to the ejection roller 8. A discharged paper end sensor S2 is arranged near the fixing device 5 in order to manage the paper running during this time.

After switching the paper feed end sensor S1, the paper 1 fed by the paper feed roller 6 is sent by the registration roller rough, passes through the EP cartridge 3 and the transfer device 4 that constitute the printing mechanism section (2), and is then transferred to the fixing device 5. sent to. The timing of the start from the paper feed roller 6 to the registration roller 7 and the paper running state from the registration roller 7 to the fixing device 5 are sensed by the paper feed end sensor S1.

The paper 1 further passes through the fixing device 5, switches the discharge paper edge sensor S2, and is stacked by the discharge roller 8.

The paper traveling state from the fixing device 5 to the paper discharge is detected by the discharge paper edge sensor S2. This ejected paper edge sensor S
The abnormal states detected by 2 include "paper empty" and "paper jam."

"Paper empty" is a case where the feeding paper edge sensor S1 is not switched in a predetermined time from the paper feed roller 6 to the registration roller rough ("error ■"), and "paper jam" is a case where the feeding paper edge sensor If the switching of the feeding paper edge sensor S1 is not completed after a predetermined time after switching Sl ("error ■"), and if the switching of the ejecting paper edge sensor S2 is not completed within a predetermined time after the switching of the feeding paper edge sensor S1 is completed. ("error ■") and when the switching is not completed even after a predetermined period of time has elapsed after the switching ("error ■").

The main control unit 10 determines whether an "error" is detected in either the fed paper end sensor S1 or the ejected paper end sensor S2, and also determines the location where the abnormal paper running state occurs. Furthermore, if the output of the paper feed end sensor S1 indicates "paper empty"("error■"), the main control section 10 does not stop the paper feed traveling mechanism section I regardless of "Empty".
Paper feeding is retried a predetermined number of times, for example, 2 to 3 times, and if the "error" caused by the output of the paper feed end sensor S1 is still not cleared, the process is stopped.

Further, the main control section 10 stops the paper feeding traveling mechanism section I when an abnormality is detected by the paper feeding end sensor S1 and is a "paper jam"("error■").

Further, the main control unit 10 stops the paper feed traveling mechanism unit ■ in the case of “error ■” detected by the ejected paper end sensor S2, but also stops the paper feed traveling mechanism unit in the case of “error ■”. It functions to retry (2) a predetermined number of times.

〔Effect of the invention〕

As described above, according to the present invention, the paper feed running mechanism section and the paper discharge running mechanism section are both equipped with one or more paper edge sensors, and it is possible to determine which paper edge sensor is used to detect abnormal paper running. As a result, depending on the judgment result, a retry is made without stopping any of the transport mechanisms regardless of the abnormal paper transport state, so the abnormal state often resolves during this period. It is possible to provide an unprecedented and excellent printing device that can minimize the number of error handling operations performed by an operator.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view showing one embodiment of the present invention, and FIG. 2 shows the overall control circuit of the device in FIG. 1...Paper, 2...Paper hopper, 3.
...EP cartridge, 4...transfer device,
5...Fuser, 6...Paper feed roller, 7
...Registration roller, 8...Ejection roller, ■...Printing mechanism section, ■...Paper feed traveling mechanism section, ■...... Paper ejection traveling mechanism section, Sl.
...Feeding paper end sensor, S2...Discharging paper end sensor. Applicant: NEC Corporation

Claims (1)

[Claims] (1) A paper feed running mechanism section and a paper discharge running mechanism section that are installed via the printing mechanism section, and a paper edge detection sensor that is installed in each of the paper feeding running mechanism section and the paper discharge running mechanism section; In the printing apparatus, the printing apparatus includes a main control that operates immediately upon input of an abnormality detection signal from each paper edge sensor to control the stoppage of the paper feed running mechanism section, wherein the main control section controls the paper feed running mechanism section. The main control unit is equipped with a paper counter that starts or stops when the paper is moved, and when the main control unit receives an abnormal signal sent from any of the paper edge sensors, the main control unit takes priority over the stop control for the paper feed running mechanism unit. a counter start control function that activates the paper counter when the paper counter starts counting, and a counter start control function that starts the paper feed immediately if an abnormal signal from the paper end sensor is input even after the time for the paper counter to count several sheets of printing paper has elapsed. A printing device comprising a stop control delay output function for activating a stop control function for a paper running mechanism.