JPH0335110B2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Technical Field of the Invention The present invention relates to recovery control in the event of a jam in a post-processing device of an electronic printer that cuts sheets one by one and has an offset function for each job. It is about the method.

(2) Prior Art and Problems FIG. 1 is a diagram showing the configuration of a conventional post-processing device of an electrophotographic printer. In the figure, 1 is a printer printing unit equipped with a character generation mechanism 2, a photosensitive drum 3, a fixing device 4, a hopper 5, etc., 6 is a host device, 7 is a print control unit, 8 is an input pointer, 9 is an output pointer, 10 is an offset storage register, 1
1 is a comparator, 12 is a fixed page length, 13 is an AND
circuit, 14 is a continuous device, 15 is a paper buffer loop, 16 is a cutter, 17 is a paper passage detector, 1
Reference numeral 8 indicates a paper offset mechanism, and reference numeral 19 indicates a stacker. In this device, there is a shift in the character image generated by the character generation function 2 until it is transferred to the paper 14, a shift in the fixing device 4, a shift due to the buffer loop 15 for paper positioning in the paper cutter 16, etc. , the actual paper offset mechanism 18 responds to an offset (sorting) instruction issued from the host device 6 to the post-processing device for a certain page.
Until then, it must be controlled by taking into account the existence of misalignment of many pages of paper. Therefore, an offset storage register 10 is provided as offset storage means, and the input pointer 8 is incremented by 1 each time one page of print data is input from the host device 6, and at the same time, the presence or absence of an offset is stored in the register 10.

On the other hand, the value of the number of pages for the deviation between the page position sent from the host device 6 and the paper passage detector (fixed page length depending on the paper size) is compared with the value of the input pointer 8, and the latter value is larger than the former. The comparator 11 detects this.

Logic between this signal and paper passage detection signal
By performing AND, the output pointer 9 is incremented by 1 every time one page is detected to be disconnected. This reads the offset storage register 10 and controls whether or not the paper offset mechanism 18 is operated.

In such control, when an abnormality such as a paper jam occurs in the post-processing device, conventionally, the input/output pointers 8 and 9 are reset by a reset signal from the print control section 7, and the stacker is reset to ensure offset. It was restarting immediately after the page that was successfully stacked.

For this reason, even when the degree of jamming is slight and restarting is possible with some operator intervention, a lot of paper is wasted and the burden on the operator and host device for restarting is heavy.

(3) Purpose of the Invention In view of the above-mentioned conventional drawbacks, the present invention aims to provide a control method for a printer post-processing device that does not require restarting even when a slight jam occurs. That is.

(4) Structure of the Invention According to the present invention, this object is to be used by connecting to an electrophotographic printer, to cut printed continuous paper into sheets of a predetermined length one by one, and to A function to offset the paper of each job, a means to record the presence or absence of an offset for each page corresponding to the difference between the offset specification from the host device and the actual offset of the paper, and a means to record the presence or absence of an offset for each page corresponding to the difference between the offset specification from the host device and the actual offset of the paper, and the function to offset each page input from the host device. In a printer post-processing device having an input pointer for updating the address of the storage means for each page ejected to the stacker, and an output pointer for updating the address of the storage means for each page ejected to the stacker, the fixed page length is subtracted from the input pointer value. An arithmetic unit that can preset the pull output pointer is added, and when an error occurs, the input pointer is not reset, the input pointer value remains as it was, and the output pointer value is converted from the input pointer value to a fixed page length by the arithmetic unit. is preset to a value obtained by subtracting the
Achieved by providing a method for controlling a printer post-processing device, which is characterized in that it guarantees an offset for paper remaining in the post-processing device without retransmitting data from a host device retroactively at the time of restart. be done.

(5) Examples of the invention Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a diagram showing the configuration of a printer post-processing device that can implement the control method according to the present invention. The figure shows the main parts, and the omitted parts are the same as in FIG. 1. Further, the same parts as in FIG. 1 are indicated with the same reference numerals. The difference from Fig. 1 is that the reset of input/output pointers 8 and 9 when an error occurs is eliminated, and a new computing unit 20 is added that computes (input pointer value) - (fixed page length) and presets the output pointer 9. That's what I did.

Next, the control method of the present invention will be explained with reference to FIG.

During normal output, the conditions for incrementing the output pointer are the same as in the conventional example. That is, the comparator 11 detects the page number value corresponding to the deviation between the page position sent from the host device and the paper passing detector, and the value of the input pointer 8, and outputs the output pointer 9 by ANDing this signal and the paper passing signal. Increase by 1 each time one page is detected to be disconnected.

When an error occurs, the arithmetic unit 20 calculates (input pointer value) - (fixed page length), and the result of the calculation is preset to the output pointer 9 by a preset signal from the print control section 7.

Therefore, the restart input pointer 8 is incremented by 1 every time one page is sent from the host device, and "1" is stored in the register 10 if an offset instruction is given. On the other hand, since the signal from the comparator 11 is already "1", the output pointer 9 is incremented by 1 for each paper passage detection signal, and if the offset information stored in the register 10 before the error occurrence is read out and is "1", then Operate the paper offset mechanism.

In this way, the present invention does not reset the input/output pointer of the offset storage register when an error occurs, as in the conventional case, but instead leaves the input pointer value as it was and changes the output pointer value to (input pointer value) - (fixed page length). ), the offset information left in the offset storage register is saved, and the remaining processing is continued again when restarting, so there is no need to restart in the event of a slight jam.

(7) Effects of the Invention As explained above in detail, the method for controlling the post-processing device of the printer device of the present invention is such that when an error occurs, the output pointer is set to (input pointer value) - (fixed page length). This has great effects in that it does not require restarting even in the event of a slight jam, eliminates paper waste, and reduces the burden on the operator and the host device.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining the configuration of a conventional printer post-processing device, and FIG. 2 is a diagram showing the configuration of a post-processing device for implementing a method for controlling a printer post-processing device according to the present invention. be. In the drawing, 1 is a printer printing section, 6 is a host device, 7 is a print control section, 8 is an input pointer, 9 is an output pointer, 10 is an offset storage register,
11 is a comparator, 12 is a fixed page length, and 13 is a
16 is an AND circuit, 16 is a cutter, 17 is a paper passage detector, 18 is a paper offset mechanism, 19 is a stacker, and 20 is an arithmetic unit.

Claims (1)

[Claims] 1 It is used by connecting to an electrophotographic printer, and has the function of cutting printed continuous paper into sheets of a predetermined length one by one, and offsetting the cut paper in job units, and the ability to means for recording the presence or absence of an offset for each page corresponding to the difference between the offset specification and the actual offset of the paper, an input pointer for updating the address of the storage means for each page input from the host device, and a stacker. In a printer post-processing device having an output pointer that updates the address of the storage means for each ejected page, an arithmetic unit is added that can subtract a fixed page length from the input pointer value and preset the output pointer. When an error occurs, the input/output pointer is not reset, the input pointer value remains as it was, and the output pointer value is preset by the arithmetic unit to the value obtained by subtracting the fixed page length from the input pointer value, thereby preventing minor jams, etc. A method for controlling a post-processing device of a printer, characterized in that the offset for paper remaining in the post-processing device is guaranteed without retransmitting data from a host device retroactively at the time of restart.