JPS59152882A - Cutting method for printing paper - Google Patents

Abstract

PURPOSE:A cutting method for a printing paper excellent in utilility, by which a paper-cutting command can be outputted without adopting a marking system. CONSTITUTION:Paper buffers 11, 12 are intermediately provided between a printer and a paper processor, a predetermined numerical value is stored in a memory when a paper is first set, and 1 is added to the content of the memory each time the paper is fed out from the printer by a unit length, while 1 is subtracted from the content of the memory each time the paper is fed by a unit length by the processor. When a paper-cutting command is outputted from the printing side, the pulse length at that time is stored in a memory, 1 is subtracted from the content of the memory each time the paper is fed on the processor side by a unit length, and the paper is cut when the subtracted value reaches a predetermined value.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for cutting printing paper, more specifically,
The printer and paper post-processing device are connected via an interface, and paper cut commands (
CUT-CMD) relates to a printing paper cutting method that detects the cut point of the paper and cuts it.

- When printing output, a printer (N I
A paper buffer is provided between the paper post-processing machine (BTS) and the paper post-processing machine (BTS) in order to absorb the speed difference between the two.

A paper cut command is normally issued from the NIP side upon detection of the completion of a series of printing of the same type.In response to the above cut command, the paper is canted by a blade on the BTS side. As a means of detecting the cut position,
Conventionally, a mark was printed on a part of the paper, and this mark was
A reading method using S has been proposed.

However, it is actually very difficult to read the marks reliably, and on the other hand, it is not preferable in terms of form preparation to provide a writing area exclusively for marks on the bullet paper.

The present invention has been made in consideration of the above points, and includes:
The purpose of this is to make it possible to issue a paper cut command without using the previously proposed marking method.
The present invention aims to provide a highly practical method for cutting printing paper.

The present invention connects a printer and a paper post-processing device via a paper buffer, and detects and cuts paper cut points in response to a paper cut command (CUT-CMD) issued from the printer side. In the paper cutting method, when the paper is first set, a predetermined numerical value is stored in the memory, and at the same time as the system starts operating, 1 is added to the memory contents each time the paper is fed by a unit length on the printer, and the paper is cut by 1. Each time the paper is fed by a unit length in the processing machine, 1 is subtracted from the contents of the above memory (this counter value is called the bus length).When CUT-CMD is issued on the printing side, the bus length at that time is stored in the memory and shifted. The first feature is that the paper post-processing device subtracts 1 from the contents of the memory each time the paper is fed by a unit length, and when this subtracted value reaches a predetermined value, paper cut is executed. The second feature is that the memory mentioned in the first feature is provided in multiple addresses/groups, and the bus length is stored in the first address, and the first CUT- After a CMD is issued, based on the CUT-CMD (if the second CUT-CMD is issued before the paper cut is executed, the second address of the ring memory is 1
The unit length counted up between the first CUT-CMD and the second CUT-CMD is memorized, and in the same way, every time CUT-CMD is issued, the previously issued CUT-CMD is
If paper cut has not been executed before the UT-CMD, the unit length counted up between the current CUT-CMD and the previous CUT-CMD is sequentially stored in the memory at the above multiple addresses. Then, if all the paper cuts have been executed in response to the previously issued CUT-CMD, the above path length is stored in the memory at the above multiple addresses, and the paper post-processing machine cuts the paper into unit lengths. Each time it is sent, 1 is subtracted from the contents of the first address stored, and when that value reaches a predetermined value (for example, O), paper cut is performed, and the above path length or CUT is also applied to the next address. −
If the unit length counted up between CMDs is stored, 1 is subtracted from the contents of that address each time the paper is fed by a unit length in the paper post-processing machine, and when that value reaches a predetermined value. The key point is that the paper cut is executed at , and the above operation is repeated.

Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

FIG. 1 is an explanatory diagram of the drive system of an electrophotographic page printer (NIP) and a paper post-processing machine (BTS) that are linked to the electrophotographic page printer (NIP) suitable for carrying out the method of the present invention, and is surrounded by dotted lines. The part with code 1 is NIP.

The 20th section indicates the BTS. 3 is bullet paper, 4
is a NIP developing machine, 5 is a photosensitive drum, 6 is a transfer section, 7 is a NIP tractor, 8 is a fixing device, 9°9 is a heat roller,
10 is a guide roller.

11.11 is a buffer roller, 12U paper buffer, 1
3 is a BTS), 14.14 is an input roller, 15 is a paper cutting blade, 16.16 is an output roller, 17.17 is a puller roller, 18 is a swing fin, 19 is a stack table, and 20 is a paper guide. .

In the above configuration, the bullet paper 3 passes through the NIP tractor 7, passes through the fixing device 8, the heat roller 99, the guide roller 10, and the buffer rollers 11, 11, and is stored in the paper buffer 12, and then is stored in the paper buffer 12. tractor 13, blade 15 via input rollers 14 and 14
It passes under the output rollers 16, 16 and reaches the blur roller 17.
8, it is folded onto the stack table 19.

The output rollers 16, 16 are normally open, and when the part of the print paper 3 to be cut comes under the blade 15, the feeding of the paper 3 is stopped and the output roller 1 is opened.
6 and 16 are closed, and the blade I5 is lowered to cant the paper 30 at a predetermined location.

By the way, the cut point on paper printed out by a computer is usually the perforation after a series of jobs (JOB) is completed, and the cut position command (CUT
-CMD) is usually performed immediately after completing a series of JOBs or after sending several dummy pages. To explain this with reference to FIG. 1, the CUT/CMD of the print paper 3 is given when the seventh groove of the paper 3 to be cut passes through the transfer unit 6. Thereafter, the JOB continues, and when the perforation portion subjected to CUT-CMD reaches below the blade 15, the blade 15 descends to perform paper cutting. Note that when setting the paper 3, when one perforation is located in the transfer section 6,
locating the other perforation directly below the blade 15;
In other words, there is no problem in making the paper length from the transfer unit 6 to the blade 15 an integral multiple of the length of the first page (from one folding perforation to the next folding perforation), but when used. When the size of the paper differs, the length of the paper from the above-mentioned transfer section 6 to the blade 15 naturally also differs. However, since the NIP and BTS are connected via the paper buffer 12 installed in the BTS, if the paper buffer 12 is made to slacken, the length of the paper can be reduced. Even for continuous paper, the paper length from the transfer unit 6 to the blade 15 is
It can be an integer multiple of the page length. This paper length is
For example, if a sheet of paper with a length of 11" is used and there are 8 pages, 11X8=88". If the length of -*0.5'' is expressed as 1, the paper length for the above 8 pages is 88X2=17
It can be expressed as 6 and 7. On the other hand, the NIP) controller 7 generates a signal of one pulse every time the print paper 3 is fed by 0.5'' (this paper feed information) (referred to as the rp signal), and the BTS l-actor 13 feeds the paper 3. 0.5
“One pulse signal is generated each time the paper is sent (this paper feed information is called the BHip signal).
) By installing an enocoder on the motor that drives the tractor 13 or on each tractor shaft, the H'p signal and B
(can be easily extracted as a Hip signal). Therefore, when paper 3 is first set, the system starts operating by storing the numerical value 176 in the memory, adds 1 to the memory contents when the H1p signal is output, and adds 1 to the memory contents when the BHip signal is output. By always performing the operation of subtracting 1, the value in the memory can always represent the paper length (the length from the transfer unit 6 to the blade 15) at any moment.
This count value is called the path length). As printing progresses and one JOB is completed, if the conbeater determines that the paper output (printed) in this JOB (last page of the JOB) should be cut at the perforation next or several pages later, it will cut at that perforation. At the time when the image passes through the transfer section 6, 1. N
CUT-CMD is issued from the IP controller. Taking this as an opportunity, the path length at that time is read by a counter and stored in memory. And BHip on the BTS side
If you subtract 1 from the contents of the memory each time a signal is issued, when the value reaches O, the perforation where CUT-CMD was issued will reach just below the blade 15, so this All you have to do is cut the paper at this point.

(Oh, BTS) Acta 13i"l: In reality, it cannot stop instantly, so for example, if the paper length required from high-speed paper feeding to stopping is 1", the time when the memory value becomes 2. It is sufficient to start decelerating the motor of the tractor 13 at , and then stop the tractor 13 when the value in the memory reaches O. However, if the cutting speed of the blade 15 is set to a high speed and the sewing machine with CUT-CMD is If the cutting operation is performed immediately when the eye reaches directly below the blade, there is no need to stop the paper 3.

Since the paper length from the transfer unit 6 to the blade 15 is relatively long, after a CUT-CMI) is issued due to the completion of one JOB, the next or next time the paper cut is executed before the CUT-CMD is executed. Subsequent CUT
-CMD may be issued (in case of short JOB). In such a case, it is advisable to adopt the processing method described below.

That is, in addition to the color/ri (Cp) that calculates the path length,
A counter (CH) is provided that adds 1 every time a Hip signal is issued after CUT-CMD is output. Further, the memory is provided at a plurality of addresses (for example, addresses 0 to n) (n is an integer), and the contents of the memory at address 0 are expressed by Mn, and the contents of the memory at address MO1n are expressed. Furthermore, two types of indicators are provided (it and i2), which count up one by one from 0 to n, and return to 0 when the count exceeds n. 11 is CU
It is a type of renog counter that increases the power by one each time there is a T-CMD, and returns to 0 if there is the next CUT-CMD after it becomes a dog than n. Reference numeral 12 designates one of the plurality of addresses (MO-Mn) in the memory described above, and each time the BH1p signal is output, 1 is subtracted from the memory contents at the designated address. Also, like 11, 12 specifies the final address n of the memory (12=n
), 1 from the contents of memory Mn every time the BHip signal is output.
When the contents of this memory Mn become 0, the memory returns to 12-0, that is, the memory returns to address 0, which is a kind of log counter.

When I first pressed the paper, it was 11-0.12-0, M
(, -M n are all set to 0, and the operating force of the system; when the first CUT-CMD is issued after starting,
The contents of the counter Cp for calculating the path length are written to the memory at address 0 designated by 11-00. and i,-
The count is increased to 1, and at the same time, the empty CH is cleared (=O).The contents of memo 1 at address 000 are set to M. Then, Mo is decremented by 1 each time a BHip signal is output. Furthermore, each time the H1p signal is output, the contents of the CH are incremented by 1.

Memory M indicated by indicator 12. Contents of 75;0
When not, when the second CUT-CMD is emitted,
The contents of the counter Cl are written to the memo IJM at address 1 designated by 1l=1. Then, the count is increased to 11-2, and at the same time, the counter CH is cleared again. That is, the first CUT-C is stored in the memory M1.
The paper length (in inches x 2) sent by Nip from force 1 after MD is issued until the second CUT-CMD is issued is written.

When the content of the memory MO indicated by the indicator 12 is not O, when the third CUT-CMD is issued, the content of the counter CH is written to the memory M2 at address 2 designated by 'l-2. The counter CH is set and counted up to 11-3, and at the same time the counter CH is cleared.

On the other hand, when the BH4p signal is output and the contents of the memory MO eventually become 0, paper cut is executed, and at the same time 12
is added by 1, resulting in 12-1.

When it reaches 12-1, 1 is subtracted from the contents of the memo IJMI every time the BHjp signal is output. Memo IJM,
When the contents of the counter CH are not 0, when the fourth CUT-CMD is issued, the contents of the counter CH are written to the memo IJM3 at address 3 designated by 11=3. And 11
-4, and at the same time the counter CH is cleared.

In the above embodiment, if it is assumed that no subsequent CUT-CMD is issued after the fourth CUT-CMD is issued, the paper cut is executed when the content of the memory M1 becomes 0, jz=2. When 12=2, this time, every time the BH4p signal appears, a memo 'J M
1 is subtracted from the contents of 2, and when the contents of the memory M2 become 0, paper cutting is executed, and 12=3.

When 12=3, 1 is subtracted from the contents of memory M3 every time the BHip signal is output, and the contents of memory M3 become 0.
Paper cut is executed when 12 = 4, and by repeating the above operation, a memo') M
The contents of o-M H are all 0.

In this state, when CUT-CMD is issued again, the contents of the counter Cp are written into the memory M4 indicated by 11-4, and at the same time, the counter C) is cleared.

To summarize the above, if '2''''I and the contents of the memory specified by 12 are O, the current contents of the counter Cp are written to the memory specified by the indicator il, and either i2%il or 12. If the contents of the specified memory are not 0, NG) (The counter value is written to the memory at the address specified by 11.

The above operations can be processed by a microcomputer according to the flowcharts shown in FIGS. 2 to 4.

Next, the operation of the present invention will be explained with reference to FIG. 1 and FIGS. 2 to 4. FIG.
A flowchart for calculating the time change of the paper (paper length) set across the TS, FIG. 3 is a flowchart for storing the CUT-CMD of the paper in the memory,
FIG. 4 shows a flowchart for detecting the cut position of the paper.

In FIG. 1, there is now one perforation of the bullet paper 3 in the transfer section 6 of the NLP, and the other perforation is directly below the blade 15 of the BTS, and the paper 3 is When the start switch is turned on, the program is branched to position E in FIG. 2 when the buffer length is set to the appropriate standard and both the NIP and BTS are in the ready state. First, a multi-address memo IJM used for CUT-CMD control. -Write 0 to all Mn, put 0 to memory Fc as a flag,
Similarly, put 0 in the memory FB as a flag, and put 0 in FD as well. Indicators 11 and 12 used for memory address designation are both 0, counter CH is also 0, and counter C is 0.
The path length Lo is stored in p.

The path length LO at startup is 88", taking 8 pages of 11 paper as an example. If the length of O, S // is 1, then Lo=
88X2=176 (decimal number) is stored.

H4p issued every time paper 3 is fed by 0.5" on the NIP side
Determine the signal, and if there is a H1p signal, counter CH or I
Add 1 to the contents of CH and Cp and transfer the contents again to CH and C
p (CH−CH+1.Cp=Cp
+1). If there is no Hip signal, both CH and Cp do not operate. Next, when the perforation to be cut reaches the transfer section 6, CUT/CMD is issued.
When CUT-CMD is issued, flag Fc becomes 1.

On the other hand, BTS) Lactae 3 determines the BHip signal that is output every time paper 3 is fed by 0.5", and if there is a BHip signal, it subtracts 1 from the contents of counter cp and stores the contents in Cp again (Cp = Cp-1), flag FB is set to 1. Also, the content M of the memory at the address indicated by flag 1□
When j2 is not 0, M! Subtract 1 from 2 and write to the same address again (M'2=Miz 1).

If there is no BHip signal, FI3 is set to 0.

In addition, the above flag FB and FCI FD ii:
, are used only to facilitate program branching.

When the computer processing shown in FIG. 2 is completed, the program branches to the flowchart shown in FIG. 3.

In FIG. 3, whether the flag Fc is 1 or not, that is, CU
Determine whether T-CMD has been issued, and
If D is issued, it is determined whether the indicator 12 is equal to 11, and if '2='1, it is determined whether the memory content Mi2 indicated by '2 is 0 or not. +2
If =i1 and Mi2 is 0, it means that there is no part to be cut in the current path length, so the current contents of the counter Cp are written to the memo IJMi1 indicated by the indicator 11. At the same time, the counter CH is cleared and the indicator ilO value is counted up to 's=it+1.

As shown as step 13 in FIG. 3, when FcN1, that is, when CUT-CMD is not issued, no operation is performed in this branch.

If it is 12l in step 14, or if M'2'=O even if it is +2-11, it means that there is a part of the path length where paper cutting has not been performed yet, so the indicator The contents of the counter CH are written to Mil indicated by 11. Then, the counter CH is cleared and the value of the indicator 11 is counted up to il=+1+1.

In addition, in step 19 in FIG. 3, when the value of the indicator 11 exceeds the maximum address of the memory 9, the indicator 1 is
．． It is not provided to return the value to 0.

When the computer processing shown in FIG. 3 is completed, the program branches to the flowchart shown in FIG. 4.

In FIG. 4, it is determined whether or not the flag FB is 1, that is, whether or not there is a BHip signal in step 6 of FIG. Branch to the Y side and set FB=O. BH4+
) signal is issued several times, eventually 'i Mj2 = 2 as shown in step 24.

This is when the paper length required from high-speed paper feeding to stopping is, for example, 1", and is indicated by the reference numeral 13 in Fig. 1.
Motor deceleration of the TS tractor is started 1" before the scheduled cutting position (Mi2=2), and when the motor has progressed 1" from deceleration, feeding of the paper 3 is stopped and preparations are made to execute paper cutting.

As mentioned above, when the contents of the memo lJMi2 are reduced to 2, a command to decelerate the feed of paper 3 is issued and the FD is reduced to 1.
After that, the BHip signal is output twice and Mi2=0, and when paper cutting is executed, the FD is set to 0, and at the same time, the value of the indicator 12 is counted up to +2=i2+1. Note that when step 22 is entered with the content of the flag FB being 0, that is, when the BHip signal is not output, no operation is performed in this branch.

On the other hand, when Mi2=2 is not reached, paper cutting is not executed, and when FD=1 and M 1 '2 'q O, or when 12≦n, there is no change in the contents of the indicator 12. There is no need to explain it again here.

After passing through the branch shown in FIG. 4, the instruction system of the program shifts to the branch shown in step 2 in FIG. 2, and thereafter the above operations are repeated.

Next, a concrete example of the present invention will be explained while applying numerical values.

In FIG. 2, the value of n of the memo IJ M n is, for example, if the path length is 88", the minimum span length processed by the BTS is 4", and the value is 22 pages, so if it is n-22, then Although it is sufficient, it is set to n-30 to give some margin. Therefore, the memory Mo is set to address O, and the memo "JMn" is set to address 30. In order to simplify the explanation, paper with a length of 11" is used, and CUT/CMD is set every 4 pages, that is, 4 pages
It is assumed that it appears every 44 hours.

(1) When the initial setting of paper is completed and the operation is started, each memory and counter are initially set in step 1 of FIG. 2, and the counter Cp is set to 176 (=88×2). When paper feeding starts and the Hip signal outputs 44X2=88 pulses, CUT-CMD is issued on the Nip side. At this time, it is assumed that the paper has been fed 46" on the BTS side. In other words, the BHip signal is 46X2
=92 pulses are output.

Initially, indicator 11=0112=o, mata,
Memory M. The contents of -M3(, are also all 0.

When the first CUT-CMD is issued, the contents of the counter CH shown in step 3 in Fig. 2 are 88 (counter C
p will be described later), and the program branches to the Y side in step 4, and the flag Fc=l. After the start of operation, when the H1p signal outputs 88 pulses on the NIP side, the BH4p signal outputs 92 pulses on the BTS side, so step 3
and 7, the content of counter Cp is Cp=17
6+88-92=172.

Since 12 remains O and MO has been 0 until now, the process branches to the Y side at step 8.

As mentioned above, 7 lag Fc=1, so in step 13 of FIG. Cp to
The value 176 is stored, F c = 0, and in step 17 CH returns to 0, and in step 18 '1='O+1
=1.

In addition, the BH1p signal has been output 92 times in the past, and each time it has branched to the Y side at step 22 of the fourth time, but l z = 0
, Mo' = 2, F D = 0, and at step 24 it branches to the N side, and at step 26 it also branches to the N side.

(2) Next, assume that the paper has been fed 4 pages (=44'') on the NIP side, and when the second CUT-CMD is issued, the paper has been fed 43'' on the BTS side. At this time,
FC-1 at step 1o in FIG. 2, counter CH=813 at step 3-, and the contents of the counter Cp between steps 3 and 7 (after the Mi-th CUT-CM″D,
The contents of the counter C9 until the second CUT-CMD is issued is Cp=172+(44-43)X2=174. Indicator 220 and M
IP is 43x2=86, so Mo”'172-8
6=86.

In Fig. 3, jt = 1.12 = Of j + # Since there are 11 times, the contents of the counter ch, that is, 44X2 = 88, are written to Ml through step 21, and in step 17, CH
20. In step 18, 11=2.

In FIG. 4, after 172 is written to M, step 24
At step 26, I passed through the N side.

(3) Following (2) above, 4 pages of paper (=
44") and the third CUT-CMD is issued, it is assumed that the paper has been fed 41.5 inches on the BTS side. At this time, in step 3 of FIG.
H=88 (counter Cp will be described later)1. C.U.
Since there was a T-CMD, the contents of the counter Fc-1 in step 10 and the counter Cp in steps 3 and 7 (after the second CUT/CMD, the third CUT-CM
The content of the counter Cp until D is issued is Cp=
174+ (44-41,5) X 2 = 179, memory Mo = 86 41.5 X 2 = 3, tz'u
Since x, the contents 88 of the counter CH are written into the memory M2 at step 21 in FIG. Then, the counter ch is cleared and counted up to 1l==3 in step 18. Figure 4 is the same as Maehara (2).

(3)' Now, in the above case, the content of MO becomes 3, but if the paper is fed another 0.5" on the BTS side, the content of MO becomes MO=2. Then, in step 24 of FIG. Branches to the Y side, and the BTS sends a command to prepare for cutting to the paper feed control system and cut control system, and becomes FD-1. After that, when BH4p is issued twice on the BTS side, paper feeding is stopped and the paper is stopped. The cut is executed.

M. After =2, FD=1, so in step 26, pass through Y and M. When it becomes -0, it passes through the Y side in step 27, and in step 28, FD=O, and 12=1, and paper feeding is restarted.

(41 After the 3rd CUT-CMD on the NIP side, the paper is fed another 44" and the 4th CUT-CMD
When D is issued, memory M is stored on the BTS side. Assume that the paper has been fed 20" since -O. However, when the third CUT/CMD occurs, the memo IJM
Since o=3, by the time MO=0, BH1
This means that the p signal appears three times (i.e., B'T,, S
Therefore, after the third CUT-CMD appears, the fourth CUT-CMD appears.
Until the UT-CMD is issued, on the BTS side,
This means that the paper has been fed 20 + 1.5 = 21.5''. At this time, FC = 1 in step 10 of Fig. 2, counter CH-88 in step 3, and color/color Cp in steps 3 and 7. The content (the content of counter Cp when the fourth CUT-CMD is issued after the third CUT-CMD) is Cp=179+(4421,5
)X2=224 and indicator 12-1, memory M=88-20x2=48, 12Ni1.11-3 at step 14 in FIG.
The contents 88 of CH are written to the memory M3. Also, M
1?2, FD=0, the program branches to the N side at steps 24 and 26 in FIG.

However, if the above-mentioned operation continues, the indicator will eventually count to 11-30, but 88"+
Assuming that the BTS paper feed speed is controlled so that the path length falls between 30", 88" + 30" -
118". On the other hand, indicator 11
is counted and amplified by one every 44", and a maximum of 1
18/44=2.7<3 The previous memory must be O, so when 1l=30, the memory Mo to M27-i should be at least 0. Therefore, when 11=31 in step 18 of FIG. 3, since 11>30 in step 19, 11
It returns to -0 and can be used repeatedly by cycling through memory addresses 0 to 30. The same thing can be said about the indicator 12 in step 28 shown in FIG. 4, and when 12=31, in step 29, '2>30, =0
It is possible to return to this point and use memory repeatedly from address O to address 30.

In the above embodiment, each time the paper is fed by 0.5", the paper feed information (Hil on the NIP side) signal and the BT
Although the case where one pulse of the BHip signal (S side good.

Additionally, if the paper used for printing has different lengths (if there are multiple paper sizes), the cut position will differ depending on the paper size, but it is important to determine the path length for each paper. (For example, if the constants are read from the ROM), no matter how long the paper is, it will not interfere with the work.

As described above in detail, according to the present invention, a paper cut command can be issued without employing the conventionally proposed marking nog method, and the entire paper surface can be used for printing a normal job.

Further, according to the present invention, the CU
After T-CMD is issued, if the next or subsequent CUT-CMD is issued before the paper cut is executed for that CUT/CMD, that is,
Even if the paper feeds on the NIP side and BTS (ill) operate randomly, there is no problem in executing paper cut, and the BTS side sequentially and accurately feeds the paper in response to the CUT-CMD issued on the NIP side. It is possible to provide a highly practical printing paper cutting method that can perform paper cutting.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is an explanatory diagram of a drive system of a printer (electrophotographic type) suitable for implementing the method of the present invention and a paper post-processing machine linked thereto, and FIG. 3 is a flowchart for calculating the time change of the paper (paper length) set between the printer and the paper post-processing device; FIG. 3 is a flowchart for storing the paper cut command (CUT-CMD) in memory; FIG. 4 is a flowchart for detecting the paper cut position. 1... Printer (NIP), 2... Paper feed processing machine (
BTS), 3...Print paper, 4...Developer, 5
...Photosensitive drum, 6...-transfer section, 7...NIP
) Acta, 8... Fixing machine, 9... Heat roller, 1
0... Guide roller, 11... Buffalo roller, 1
2...Paper buffer, 13...BTS tractor,
1゛4... Input roller, 15... Paper cutting blade, 16... Output roller, 17...
Puller roller, 18... Swing fin, 19...
Stack table, 20...Paper guide, Cp...
Counter, CH...Counter, M7-Mn...Memory contents, il...Indicator, '2...Indicator, FB...Flag, FC...Flag, FD...
・Flag, LO...the path length from the transfer unit 6 of the NIP to the blade 15 of the BTS), Mi,...the content of the memory indicated by the indicator 11, Mi2...the content of the memory indicated by the indicator 12 Contents.

Claims (1)

[Claims] ■. The printer and the paper post-processing device are connected via a paper buffer, and the cut point of the paper is detected based on a paper cut command (CUT-CMD) issued from the printer side. In the printing paper cutting method, when the paper is first set, a predetermined value is stored in the memory, and at the same time as the system starts operating, the contents of the memory are updated by 1 each time the printer advances the paper by a unit length. and subtracts 1 from the contents of the memory above each time the paper is fed by a unit length in the paper post-processing machine (this counter value is called the pass length), and if CUT-CMD is issued on the print side, the current pass is The paper length is stored in memory, and the paper post-processing device subtracts 1 from the memory content each time the paper is fed by a unit length, and when this subtracted value reaches a predetermined value, paper cut is executed. Features a printing paper cutting method. 2. A printer that connects the printer and a paper post-processing device via a paper buffer, and detects and cuts the cut point of the paper in response to a paper cut command (CUT-CMD) issued from the printer/printer side. In the paper cutting method, when the paper is first set, a predetermined value is stored in the memory, and at the same time as the system starts operating, 1 is added to the memory contents each time the printer advances the paper by a unit length. Each time the paper is fed by a unit length in the processing machine, 1 is extracted from the contents of the above memory.
(this counter value is called the path length), and when CUT-CMD is issued on the print side, the current path length is stored in the first address of the memory provided in a multi-address ring shape, and paper post-processing is performed. Each time the paper is fed by a unit length on the machine side, 1 is subtracted from the contents of the above memory, and when this subtraction value reaches a predetermined value, the paper cut is executed, and the first CUT is performed from the printer side. -CMD is issued, and if a second CUT-CMD is issued before a paper cut is executed for that CUT-CMD, the second address of the ring memory is The unit length counted up between the first CUT-CMD and the second CUT-CMD is memorized, and in the same way, every time CUT-CMD is issued, the unit length is counted up.
After D is issued, if the paper cut is not executed immediately for that CUT-CMD, the unit length counted up between the previously issued CUT/CMD and the next CUT-CMD is stored in the ring memory. If all the paper cuts have been executed according to the previously issued CUT-CMD, the bus length is stored in the ring-shaped memory, and the paper post-processing machine cuts the paper into unit lengths. Each time the above value is stored, 1 is subtracted from the content of the first address stored, and when that value reaches a predetermined value, paper cut is performed, and from then on, the paper is processed by the paper post-processing machine. A method for cutting print paper characterized by subtracting 1 from the contents of the next address each time the unit length is fed, cutting the paper when the value reaches a predetermined value, and repeating the above operation. .