JP4343731B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to an image forming apparatus using continuous paper.

  In an image forming apparatus that uses continuous paper, continuous paper is supplied from a tractor to a conveyance path. In continuous paper, perforations are formed for each page of the paper in order to execute page management accurately. The continuous sheet is conveyed on the conveyance path, and after the leading edge of the continuous sheet is detected by the cueing sensor, the sheet advances by a predetermined distance and is sent directly below the print head. Here, when detected by the paper set sensor, printing is performed on the continuous paper by the print head. The printed continuous paper is further transported on the transport path, travels a predetermined distance, and then cut by a paper cutter.

Originally, it is desirable to cut continuous paper according to the perforation. However, when continuous paper is cut according to the perforation, a large amount of chips are generated, causing failure of the image forming apparatus. In addition, a paper jam occurs. Therefore, it is assumed that the cut is made after proceeding 1 mm from the position of the perforation. Therefore, for example, if cutting is performed on all pages, the cutting position is advanced by 1 mm from the position of the perforation on the first page, but the leading edge of the paper is advanced by 1 mm from the normal position on the second page. Therefore, cutting is performed at a position advanced by 2 mm from the position of the perforation. That is, the amount of deviation from the position of the perforation is cumulatively added every time cutting is performed. As a result, when the number of times of cutting is large, the shift amount becomes a value that cannot be ignored. In order to remove this harmful effect, various cutting methods have been disclosed in which cutting is performed at the position of the perforation and the above harmful effect does not occur (for example, see Patent Document 1).
Japanese Patent Laid-Open No. 5-261990

  The problem to be solved is that when a sheet is cut after a predetermined dimension (for example, 1 mm) from the position of the perforation, a deviation (for example, 1 mm) from the position of the perforation is cumulatively added every time the sheet is cut. It is.

  In the present invention, when the leading edge of the continuous paper is not cut (new paper), the leading edge of the actual paper is the leading edge of the page, and when the leading edge of the continuous paper is already cut (the paper in use), The most important feature is that the cutting position is set with a position ahead of the leading edge of the paper by a predetermined dimension as the leading edge of the page. Here, the predetermined position in front of the actual front end of the sheet refers to a position away from the actual front end of the sheet in the sheet transport direction by a dimension equal to the displacement amount (for example, 1 mm) of the cutting position from the position of the perforation.

  Even if a sheet is cut after a predetermined dimension (for example, 1 mm) has been advanced from the perforation position, an effect that the amount of deviation (for example, 1 mm) from the position of the perforation is cumulatively added every time the sheet is cut can be eliminated. Get.

  Paper tip tracking means for recognizing a distance from a continuous paper tip, paper virtual tip tracking means for setting a paper virtual tip ahead of a predetermined dimension from the continuous paper tip, and recognizing the distance from the paper virtual tip; If the continuous paper leading edge is uncut, a distance that is an integral multiple of the page length from the paper leading edge plus the predetermined dimension, and if the continuous paper leading edge is already cut, it is an integral multiple of the page length from the virtual paper leading edge. Cut position setting means for setting each cutting position to the distance plus the predetermined dimension is constituted by a control means of a CPU (Central Processing Unit) that controls the entire apparatus, and the number of increasing parts is minimized. Could be realized.

FIG. 1 is a block diagram of a control system according to the first embodiment.
As shown in the figure, the control system of the image forming apparatus according to the first embodiment includes a cut processing unit 1, a sensor 2, a paper conveyance processing unit 3, a sensor 4, a storage unit 5, and a control unit 6. . Before describing the details of each part, the general configuration of the entire apparatus controlled by this control system will be described, and further, the basic principle of control will be described.

FIG. 2 is a block diagram of the configuration of the present invention.
As shown in the figure, the image forming apparatus according to the present invention includes, as print information input means, a receiving circuit 100 that accepts print information from a host device (not shown) and an input operation circuit 107 that accepts an operator's request. The receiving circuit 100 and the input operation circuit 107 are connected to the microprocessor 101. The microprocessor 101 is a CPU (Central Processing Unit) that controls the entire apparatus, accepts print information from the receiving circuit 100 and the input operation circuit 107, executes interpretation of received character commands, and interprets operator operations. It is a part to execute. A ROM 102, a RAM 105, and an EEPROM 106 are connected to the microprocessor 101.

  The ROM 102 has a program ROM area 103 and a CGROM area 104. The program ROM area 103 is a memory area in which a computer-readable control program for executing the control means of the microprocessor 101 is stored, and the CGROM area 104 is a memory area in which CG data is stored. A RAM 105 is a buffer memory that temporarily stores print data, position information, and the like sent from the microprocessor 101. The EEPROM 106 is a memory that stores various setting conditions that determine the initial state of the image forming apparatus, such as a menu change state and a paper position at the time of paper suction.

  The microprocessor 101 also has a print head drive circuit 108 for printing an operator's operation request and print data via the IO interface 114, a print head 111, and a space for moving the print head 111 in the main scanning direction. Motor drive circuit 109 and space motor 112, line feed motor drive circuit 110 and line feed motor 113 for moving the print head 111 in the paper transport direction, cutter motor drive circuit and cutter motor for cutting continuous paper at predetermined positions 115 is connected.

Next, various sensors arranged for controlling the image forming apparatus according to the present invention will be described.
FIG. 3 is an explanatory diagram of various sensors.
This figure is a diagram showing the relationship between various sensors arranged along a conveyance path (dotted line in the figure) along which a continuous sheet is conveyed and main components. In the figure, the lower right is the upstream in the paper transport direction.

  The paper cutter 200 is a cutter that cuts continuous paper at a predetermined position, and the position on the continuous paper cut by the paper cutter 200 is the leading edge of the paper in the image forming apparatus of the present invention. A bail 201 is provided to smoothly convey a continuous sheet flowing on a conveyance path (dotted line in the figure). This bail 201 is shown with an arrow and a dotted circle in the figure for the purpose of opening the conveyance path and facilitating the conveyance of the paper once the paper is cut and then reverse fed and forwarded again. As shown by, it is comprised so that opening and closing is possible. In order to detect the open / closed state of the bail 201, a bail sensor 202 is disposed.

  In the vicinity of the bail 201, a paper jam sensor 204 for detecting a jam of continuous paper is disposed. In the vicinity of the print head 111, a paper set sensor 205, a gap sensor 211, a paper width sensor 206, and a cueing sensor 207 are arranged. A paper set sensor 205 is a sensor for detecting whether a paper is set on the print head 111. The gap sensor 211 is a sensor for detecting the thickness of the paper so that the paper is printed with an appropriate gap. The paper width sensor 206 is a sensor that moves in the main scanning direction together with the print head 111 to detect the paper width.

The cueing sensor 207 is a sensor for detecting the leading edge of the continuous paper as a reference position when a continuous paper is newly loaded. This reference position is an important position serving as a reference for recognizing a control position (for example, a sheet cutting position) required in subsequent control as a position on a continuous sheet. That is, the control position on the sheet is recognized by the amount of rotation of the line feed motor 113 (FIG. 2) after the cue sensor 207 detects the reference position.
Further, a front paper end sensor 208 that detects the trailing edge of continuous paper is disposed on the tractor 302.

Next, the basic principle of control will be described.
FIG. 4 is a diagram illustrating the principle of the present invention.
(A) shows, for example, the front end 401 of the paper when the first page is printed and the paper is cut at the cutting position 403 set to a position advanced by a predetermined dimension Z (for example, 1 mm) from the position of the perforation, and the printing 5 is a diagram illustrating a relationship among a head position 404, a perforation position 402, and a cutting position 403. FIG. These positions are set by the amount of rotation of the line feed motor 113 (FIG. 2) from the reference position. Here, the length of the sheet to be cut is longer by a predetermined dimension (for example, 1 mm) than the page length (an integral multiple of the page length).

  (B) cuts and discharges the leading edge of continuous paper as shown in (a), reverse feeds subsequent continuous paper once, forward feeds again, and prints again from the position of the perforation. After leading the dimension (for example, 1 mm), that is, when the sheet is cut to a page length (an integral multiple of 1 mm) longer than the page length (an integral multiple of the page length), the paper leading edge 401 and the print head position 404 are cut. FIG. 6 is a diagram illustrating a relationship between a perforation position 402 and a cutting position 403. Here, since the leading edge 401 of the sheet (this position corresponds to the cutting position 403 of (a)) is detected at a position advanced by a predetermined dimension (for example, 1 mm) from the normal position, the cutting position 403 is determined from the position of the perforation. Cutting is performed at a position advanced twice as much as a predetermined dimension (for example, 2 mm). That is, every time cutting is performed, the amount of deviation from the position of the perforation is cumulatively added.

In order to eliminate such an adverse effect, in the present invention, the virtual paper leading edge 405 is set in front of the actual paper leading edge 401 at a predetermined position (for example, 1 mm forward) as shown in FIG. The subsequent continuous paper is once reverse-fed, then forward-fed again based on this virtual paper leading edge 405, printed, and advanced by a predetermined dimension (for example, 1 mm) from the position of the perforation, that is, the page length (an integer thereof) This represents a state in which a predetermined dimension (for example, 1 mm) is set to be longer than that of (times) and cut. Here, the paper length from the paper virtual leading end 405 to the cutting position 403 is set to be longer by a predetermined dimension (for example, 1 mm) than the page length (an integral multiple of the page length) as shown in the figure. Therefore, every time cutting is performed as in (b), the cumulative addition of the deviation amount from the position of the perforation is removed.

The description of the schematic configuration of the entire apparatus and the principle of the present invention has been completed, and the control system of the image forming apparatus according to the first embodiment will be described in detail by returning to FIG.
The cut processing unit 1 is a part that cuts continuous paper at a predetermined position based on the control of the control unit 6, and corresponds to the paper cutter 200 (FIG. 4) driven by the cutter motor 115 (FIG. 3). Completion of this cutting process is detected by a sensor 2 (not shown in FIG. 3).

  The paper conveyance processing unit 3 is a part that conveys continuous paper on the conveyance path, and based on the control of the control unit 6, the line feed motor 113 (FIG. 2) and the conveyance roller 300 (FIG. 3) convey the continuous paper. And bail 201 (FIG. 2). The transport amount of the paper is calculated from the rotation amount of the line feed motor 113 (FIG. 2) based on the reference position detected by the sensor 4. The sensor 4 corresponds to the cueing sensor 207 (FIG. 3).

  The storage unit 5 includes cut information 5-1 including identification information for identifying whether the continuous paper in the inside is an already cut product (used paper) or an uncut product (new paper), and the paper virtual The RAM 105 (FIG. 2) corresponds to a memory that stores the cut position information 5-2 including the predetermined dimension required for setting the tip 405 (FIG. 4). Here, the cut information 5-1 may be identified by a flag represented by 1 for an already cut product and 0 for an uncut product.

  The control unit 6 is a CPU (central processing unit) that controls the entire apparatus, and executes a paper front end tracking unit that is executed based on the cut information 5-1 and the cut position information 5-2 stored in the storage unit 5. 6-1, a paper virtual leading edge tracking unit 6-2, a cut position setting unit 6-3, and a cut position detecting unit 6-4. The microprocessor 101 in FIG. 2 corresponds to this.

The paper leading edge tracking means 6-1 is a control means for tracking the paper leading edge 401 (FIG. 4A) when the continuous paper is an uncut product. This control is performed by the microprocessor 101 (FIG. 2) executed by measuring the amount of rotation of the line feed motor 113 (FIG. 2) after the cueing sensor 207 (FIG. 3) detects the reference position. Means.
The paper virtual leading edge tracking means 6-2 is a control means for tracking the paper virtual leading edge 405 (FIG. 4C) when the continuous paper is already cut. In this control, after the cueing sensor 207 (FIG. 3) detects the reference position, the paper virtual leading edge 405 (FIG. 4) is set, and the line feed motor 113 (FIG. 2) rotates in all of reverse feed and forward feed. This is a control means of the microprocessor 101 (FIG. 2) that is executed by accumulating the measured rotation amount.

The cut position setting means 6-3 is based on the cut information 5-1 and the cut position information 5-2 stored in the storage unit 5, and the leading end of the continuous sheet is not cut (cut information 5-1). If the cutting position is set to a distance that is an integral multiple of the page length from the leading edge of the sheet plus a predetermined dimension (cut position information 5-2), and the leading edge of the continuous sheet is already cut (cut information 5-1), This is control means for the microprocessor 101 (FIG. 2) that sets the cutting position to a distance that is an integral multiple of the page length from the virtual leading edge plus a predetermined dimension (cut position information 5-2).
The cut position detecting means 6-4 measures the cumulative amount of rotation of the line feed motor 113 (FIG. 2), and the cutting position set on the paper by the cut position setting means 6-3 is the paper cutter 200 (FIG. 3). ) Is a means for detecting that the position has been reached.

Next, the operation of the first embodiment will be described.
FIG. 5 is an operation flowchart of the first embodiment.
This figure shows an operation in which continuous sheets are cut at a predetermined cutting position based on the control of the control unit 6 (FIG. 1). Steps S1-1 to S1-4 will be described in the order of steps.

Prerequisite condition 1
A new sheet is loaded into the tractor 302 (FIG. 3), printing processing is started, continuous sheets are conveyed on the conveyance path (dotted line in FIG. 3), and the reference position is detected by the cue sensor 207 (FIG. 3). After that, it is assumed that printing is performed by the print head 111 (FIG. 3) and the position of the paper cutter 200 (FIG. 3) has been reached.
Prerequisite condition 2
Assume that the storage unit 5 (FIG. 1) already stores a flag 1 (uncut) as the cut information 5-1, and a position advanced by 1 mm from the perforation as the cut position information 5-2.

Step S1-1
The control unit 6 (FIG. 1) determines whether the sheet has not been cut or has been cut based on the cut information 5-1 of the storage unit 5 (FIG. 1). If the sheet has not been cut, the process proceeds to step S1-2. If already cut, the process proceeds to step S1-3. Here, since it is flag 1 (uncut) from the precondition 2 for explaining the operation, the process proceeds to step S1-2.

Step S1-2
The paper leading edge tracking means 6-1 of the control unit 6 (FIG. 1) measures the amount of rotation of the line feed motor 113 (FIG. 2) after the cueing sensor 207 (FIG. 3) detects the reference position. The cutting position setting unit 6-3 of the control unit 6 (FIG. 1) recognizes the leading end position of the sheet on the sheet, and the cutting position information 5-2 (page length + 1 mm value) of the storage unit 5 (FIG. 1). Is stored 1 mm from the perforation, and the cutting position of the uncut sheet is set (integer multiple of page length plus 1 mm from the front end of the sheet). Further, the cutting position detection means 6-4 of the control unit 6 (FIG. 1) detects that the cutting position set on the paper has reached the position of the paper cutter 200 (FIG. 3) and cuts continuous paper. To do.

Step S1-4
The control unit 6 (FIG. 1) continues to monitor the front paper end sensor 208 (FIG. 3). When the rear end of the sheet is detected, the flow ends, and the process returns to step S1-1 until the rear end of the sheet is reached. Repeat the printing process and cutting process.

Step S1-3
After the paper virtual leading edge tracking unit 6-2 and the cueing sensor 207 (FIG. 3) of the control unit 6 (FIG. 1) detect the reference position, the rotation amount of the line feed motor 113 (FIG. 2) is measured. The cutting position setting means 6-3 of the control unit 6 (FIG. 1) advances 1 mm from the perforation from the cutting position information 5-2 of the storage unit 5 (FIG. 1). The position is read, and the cutting position of the already cut sheet (an integral multiple of the page length plus 1 mm from the virtual leading edge of the sheet) is set. Further, the cutting position detection means 6-4 of the control unit 6 (FIG. 1) detects that the cutting position set on the paper has reached the position of the paper cutter 200 (FIG. 3) and cuts continuous paper. To do. Thereafter, step S1-4, step S1-1, and step S1-3 are repeated, and monitoring of the front paper end sensor 208 (FIG. 3) is continued. When the trailing edge of the sheet is detected, the flow is ended.

  As described above, when setting the cutting position of the already cut paper, a paper virtual leading edge is set, and the paper cutting is performed by cutting from the virtual paper leading edge at an integer multiple of the page length plus a predetermined dimension (for example, 1 mm). An effect is obtained that an adverse effect that a deviation amount (for example, 1 mm) from the position of the perforation is cumulatively added every time can be removed.

In the above description, it is assumed that the paper tip tracking means 6-1, the paper virtual leading edge tracking means 6-2, the cut position setting means 6-3, and the cut position detecting means 6-4 are all configured by the control means of the control unit 6. Although described, the present invention is not limited to this example. That is, all or a part of the above means may be constituted by a dedicated electronic circuit.
In claim 1, the role of the medium edge detection unit is shared by the cueing sensor 207 (FIG. 3), and the roles of the cutting information storage unit and the predetermined value storage unit are shared by the storage unit 5 (FIG. 1). The roles of the cutting information setting unit and the printing control unit are shared by the control unit 6 (FIG. 1).

FIG. 6 is a control system block diagram of the second embodiment.
As shown in the figure, the control system of the image forming apparatus according to the second embodiment includes a cut processing unit 1, a sensor 2, a paper conveyance processing unit 3, a sensor 4, a storage unit 5, and a paper retraction monitoring unit 11. The sheet attachment / detachment monitoring unit 12 and the control unit 13 are provided. In the figure, the same components as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment.

Only components different from the first embodiment will be described.
The paper evacuation monitoring unit 11 is a part for detecting a paper park operation, and the front paper end sensor 208 (FIG. 3) during the paper feed plays this role. Here, the park operation means that the continuous paper fed to the printing position is fed backward until the sensor of the tractor unit detects the paper end.
The paper attachment / detachment monitoring unit 12 is a part that detects new replacement of paper, and the front paper end sensor 208 (FIG. 3) when the paper is stopped serves as this part.

  The control unit 13 is a CPU (Central Processing Unit) that controls the entire apparatus, and based on the cut information 5-1 and the cut position information 5-2 stored in the storage unit 5, the sheet leading edge tracking means 6 is used. -1, paper virtual leading edge tracking means 6-2, cut position setting means 6-3, cut position detection means 6-4, park operation detection means 13-1, and paper attachment / detachment detection means 13-2. Prepare. The microprocessor 101 in FIG. 2 corresponds to this.

  The park operation detection unit 13-1 is a unit that keeps the cut information stored in the storage unit 5 when the sheet retraction monitoring unit 11 is monitored and a park operation is detected. That is, it is a means for recognizing that when the paper in use is simply reverse-fed and is already cut.

The paper removal / removal detection unit 13-2 is a unit that monitors the paper removal / removal monitoring unit 12, detects paper replacement, and sets the cut information in the storage unit 5 to 1. That is, it is means for recognizing that the paper of the tractor 302 is a new paper and an uncut paper.
Since other components are the same as those in the first embodiment, description thereof is omitted.

Next, the operation of the second embodiment will be described.
FIG. 7 is a flowchart of the park operation detection according to the second embodiment.
This figure shows the operation of the park operation detecting means 13-1 in the control unit 13 (FIG. 6). Steps S2-1 to S2-4 will be described in the order of steps.

Step S2-1
The control unit 13 (FIG. 6) controls the paper conveyance processing unit 3 (FIG. 6) in response to a paper retraction instruction received from the host device or the operator, and starts reverse feeding of continuous paper.
Step S2-2
The control unit 13 (FIG. 6) monitors the front paper end sensor 208 (FIG. 2), and continues the reverse feed until the absence of paper is detected.

Step S2-3
The control unit 13 (FIG. 6) controls the paper transport processing unit 3 (FIG. 6) to feed forward continuous paper until the front paper end sensor 208 (FIG. 2) detects the presence of paper.
Step S2-4
The control unit 13 (FIG. 6) holds the cut information in the storage unit 5 (FIG. 6) and ends the flow. In this way, when the paper loaded on the track is already cut, the recognition of the fact is saved.

FIG. 8 is a flowchart of the paper detaching operation according to the second embodiment.
This figure shows the operation of the sheet attachment / detachment detection means 13-2 in the control unit 13 (FIG. 6). Steps S2-5 to S2-7 will be described in the order of steps.

Step S2-5
The control unit 13 (FIG. 6) monitors the front paper end sensor 208 (FIG. 2), and when detecting the presence of paper, the control unit 13 (FIG. 6) holds the cut information in the storage unit 5 (FIG. 6) and ends the flow. If no paper is detected, the process proceeds to step S2-6.

Step S2-6
The control unit 13 (FIG. 6) recognizes that a new sheet is loaded by setting the cut information in the storage unit 5 (FIG. 6) to 0.
Step S2-7
The control unit 13 (FIG. 6) clears the cut position information 5-2 in the storage unit 5 (FIG. 6), and ends the flow in preparation for loading a new sheet.

  As described above, in the present embodiment, the configuration of the first embodiment further includes the park operation detection means 13-1 and the paper attachment / detachment detection means 13-2, so that the parked paper, the newly loaded paper, Can be easily distinguished from each other, and the paper can be easily managed.

  In the above description, the paper front end tracking unit 6-1, the paper virtual front end tracking unit 6-2, the cut position setting unit 6-3, the cut position detection unit 6-4, the park operation detection unit 13-1, and the paper attachment / detachment detection unit 13 are used. -2 has been described as being configured by the control means of the control unit 13, but the present invention is not limited to this example. That is, all or a part of the above means may be constituted by a dedicated electronic circuit.

FIG. 9 is a control system block diagram of the third embodiment.
As shown in the figure, the control system of the image forming apparatus according to the third embodiment includes a cut processing unit 1, a sensor 2, a paper conveyance processing unit 3, a sensor 4, a storage unit 5, and a paper retraction monitoring unit 11. The sheet attachment / detachment monitoring unit 12, the print head scanning unit 21, the sensor 22, the sensor 23, and the control unit 24 are provided. In the figure, the same components as those of the second embodiment are denoted by the same reference numerals as those of the second embodiment.

Only components that are different from the first or second embodiment will be described.
The print head scanning unit 21 is a mechanism portion that moves the print head 111 (FIG. 3) in the main scanning direction, and corresponds to the space motor 112 (FIG. 2).
The sensor 22 is a sensor that detects the paper width integrally with the print head scanning unit 21, and corresponds to the paper width sensor 206 (FIG. 3).
The sensor 23 is a sensor for detecting the thickness of the paper so that the paper is printed with an appropriate gap, and corresponds to the gap sensor 211 (FIG. 3).

  The control unit 24 is a CPU (central processing unit) that controls the entire apparatus, and based on the cut information 5-1 and the cut position information 5-2 stored in the storage unit 5, the sheet leading edge tracking means 6- 1, paper virtual leading edge tracking means 6-2, cut position setting means 6-3, cut position detection means 6-4, park operation detection means 13-1, paper attachment / detachment detection means 13-2, paper A width detecting unit 24-1 and an auto gap detecting unit 24-2 are provided. The microprocessor 101 in FIG. 2 corresponds to this.

The paper width detection means 24-1 is a means for detecting the paper width of a newly loaded paper.
The auto gap detecting means 24-2 is a means for detecting the sheet thickness of a newly loaded sheet so as to enable an appropriate printing operation of the print head 111 (FIG. 3).
The other components are the same as those in the first embodiment or the second embodiment, and thus description thereof is omitted.

Next, the operation of the third embodiment will be described.
FIG. 10 is a flowchart of the inhalation operation according to the third embodiment.
As described above, in the second embodiment, when the sheet is re-inhaled, the recognition of whether the currently loaded sheet is already cut or not cut is stored. FIG. 10 illustrates a subsequent operation based on this recognition. Steps S3-1 to S3-4 will be described in the order of steps.

Step S3-1
The control unit 24 (FIG. 9) reads out the cut information from the storage unit 5 (FIG. 9), determines whether or not the currently loaded paper has already been switched to a new paper, and the park operation is not performed yet. If the sheet has been changed, the process proceeds to step S3-4. If the sheet has been switched to a new sheet, the process proceeds to step S3-2.

Step S3-2
The control unit 24 (FIG. 9) controls the paper conveyance processing unit 3 (FIG. 9) to forward the paper, detects the reference position by the cueing sensor 207 (FIG. 3), and then the suction default position (FIG. 4). The paper is fed forward to the print head position.

Step S3-3
The control unit 24 (FIG. 9) controls the print head scanning unit 21 (FIG. 9) to scan the print head 111 (FIG. 3) in the main scanning direction, detects the paper width by the sensor 22, and detects the paper width by the sensor 23. The sheet thickness is detected and stored in the EEPROM 106 (FIG. 2), and the flow is terminated.
Step S3-4
The control unit 24 (FIG. 9) detects the reference position by the cueing sensor 207 (FIG. 3), and then forward-feeds to the suction position, and ends the flow.

  As described above, when the paper loaded on the track is already cut, the recognition that the paper is already cut is stored in the cut information 5-1 (FIG. 9) in the second embodiment. Since step S3-3 can be omitted, the total through-top can be improved.

  In the above description, the paper front end tracking unit 6-1, the paper virtual front end tracking unit 6-2, the cut position setting unit 6-3, the cut position detection unit 6-4, the park operation detection unit 13-1, and the paper attachment / detachment detection unit 13 are used. -2, the paper width detecting unit 24-1 and the auto gap detecting unit 24-2 are all configured by the control unit of the control unit 24, but the present invention is not limited to this example. That is, all or a part of the above means may be constituted by a dedicated electronic circuit.

  In the above description, the print head 111 in FIG. 2 is not particularly limited. In other words, the image forming apparatus to which the present invention is applied may be an apparatus having an electrophotographic print head, or an apparatus having a wire dot type print head, an ink jet type print head, or the like. There may be.

FIG. 2 is a control system block diagram according to the first embodiment. It is a block diagram of the composition of the present invention. It is explanatory drawing of various sensors. It is a principle explanatory view of the present invention. 3 is an operation flowchart according to the first embodiment. 6 is a control system block diagram of Embodiment 2. FIG. 10 is a flowchart of park operation detection according to the second embodiment. 6 is a flowchart of a paper detaching operation according to the second exemplary embodiment. FIG. 6 is a control system block diagram of Embodiment 3. 10 is a flowchart of an inhalation operation of the third embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cut process part 2 Sensor 3 Paper conveyance process part 4 Sensor 5 Memory | storage part 5-1 Cut information 5-2 Cut position information 6 Control part 6-1 Paper front-end | tip tracking means 6-2 Paper virtual front-end | tip tracking means 6-3 Cut position Setting means 6-4 Cut position detecting means

Claims (8)

An image forming apparatus that cuts and ejects a print medium from a perforation at a position shifted by a predetermined numerical value in the medium conveyance direction,
A medium edge detection unit for detecting an edge of the print medium;
A cutting information storage unit for storing information on whether or not the print medium has been cut;
When cutting the print medium, a cutting information setting unit that sets information indicating cutting to the cutting information storage unit;
A predetermined value storage unit for storing a predetermined numerical value indicating the shift amount from the perforation ;
A print control unit that manages the print position tip of the print medium,
The print control unit, when said information indicative of the cut in the cutting information storage section is stored, plus a predetermined value stored in the predetermined value storage unit on the detected tip the medium edge detector An image forming apparatus that manages the leading end of the printing position. The image forming apparatus according to claim 1,
The image forming apparatus, wherein the cutting information setting unit initializes the cutting information storage unit when a printing medium conveyance failure occurs. The image forming apparatus according to claim 1,
The image forming apparatus, wherein the cutting information setting unit initializes the cutting information storage unit when it is detected that the print medium is removed from the apparatus. The image forming apparatus according to claim 1,
The image forming apparatus, wherein the cutting information storage unit is provided in a nonvolatile memory. An image forming apparatus that cuts and discharges continuous paper at a position shifted by a predetermined dimension from the perforation after transporting a predetermined number of pages,
Paper tip tracking means for recognizing the distance from the continuous paper tip;
A paper virtual leading edge tracking means for setting a paper virtual leading edge forward by a predetermined dimension indicating an amount of shift from the perforation from the continuous paper leading edge, and recognizing a distance from the paper virtual leading edge;
Identification information for identifying whether the leading edge of the continuous sheet is uncut or already cut, and a storage unit for storing the predetermined dimension;
Based on the identification information, if the leading edge of the continuous sheet is uncut, the distance from the leading edge of the sheet is an integral multiple of the page length plus the predetermined dimension, and the leading edge of the continuous sheet is already cut. An image forming apparatus comprising: a distance that is an integral multiple of a page length from a virtual leading edge plus a cutting position setting unit that sets each cutting position at the predetermined dimension. In the image forming apparatus according to claim 5,
A park operation detecting means for setting the identification information as the already cut in the storage unit when detecting a park operation for retracting or retracting the continuous paper to a tractor position ;
An image forming apparatus, further comprising: a sheet attachment / detachment detecting unit that sets the identification information as the uncut state in the storage unit when the continuous sheets are newly replaced. In the image forming apparatus according to claim 5,
The image forming apparatus, wherein the storage unit is a non-volatile memory. In the image forming apparatus according to claim 5,
2. The image forming apparatus according to claim 1, further comprising an initial setting updating unit configured to update an initial setting of the image forming apparatus again when the sheet attachment / detachment detecting unit sets the identification information as uncut in the storage unit.

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