JPS6038309B2 - Paper running tension control device in rotary printing presses - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a running tension control device for paper guided from a printing device to a folding device in a rotary printing press that uses web paper as paper and performs printing and folding in an integrated manner. In particular, the present invention relates to a paper running tension control device in a rotary printing press that automatically controls the running tension of the paper on the upstream side of a triangular plate (hereinafter referred to as a former) for vertically folding the paper.

2. Description of the Related Art In general, the number of printing devices used in a rotary printing press varies depending on the number of pages of printed matter, and the number of sheets of paper that runs also varies accordingly.

Paper printed by multiple printing devices is sent out for each printing device by the printing cylinder of each printing device, but the feeding speed of the paper by the printing cylinder of the printing device is determined by the diameter of the printing eye, printing pressure, etc. If there is no difference in the box line transfer conditions, they can be almost the same, so generally, the paper sent out from Inzukioka of multiple printing devices is guided by guide rolls to gather near the folding device. This forms a group of paper sheets, which are superimposed and introduced between a rotating drag roll at the most upstream part of the folding device and a paper IJ roll that is pressed against the circumferential surface of this drag roll. It travels from the printing device to the drag roll and is fed into the former by being collectively indexed by the contact friction force between the roll circumferential surface and the paper and the contact friction force between the overlapping paper sheets. . However, in order to prevent each paper from loosening or sagging when traveling, the dog roll is driven to rotate at a circumferential speed slightly higher than the speed at which the printing cylinder sends out the paper, so that the dog roll is constantly attached to the running paper. The tension is applied to an extent that does not exceed the elastic limit. On the other hand, the wallis roll is rotatably supported, and the group of paper passing between the wallis roll and the drag roll is pressed by the force of a spring toward the peripheral surface of the drag roll, and the contact friction between the paper and the woven surface of the drag roll is It functions to increase the force or the contact friction force between overlapping paper sheets.

As a result, the paper group is subjected to traction while causing drag rolls and slight slips. In addition, the nipping roll, which is disposed immediately downstream of the former, is a fixed roller that is driven and rotates at a circumferential speed that is slightly higher than the speed at which the printing arm of the printing device feeds out the paper, similar to the drag roll described above. It consists of a side nipping roll and a movable side nipping roll which presses the peripheral surface of the stationary side nipping roll against the peripheral surface of the stationary side nipping roll by the force of a spring. The entire width of the paper is pinched to ensure folding in two, and at the same time, the contact friction force generated by this pinching works with the drag roll to pull the paper.

In addition, since the entire width of the paper is pinched and pulled by contact friction force, there is less slippage than when the paper is pulled by the drag roll section, and the traction efficiency is better. It is driven so that the circumferential speed is slightly higher than the circumferential speed, so that appropriate tension is generated in the paper running through the former section. Problems to be Solved by the Invention In the conventional apparatus as described above, the paper is pulled by contact friction force whose spring pressure is set in advance. If there is a change, for example, if the printing speed increases or decreases, or if the number of paper sheets increases or decreases due to a change in the number of pages, in order to obtain the contact friction force suitable for pulling these paper sheets, the The strength of the spring for pressing the lj roll against the drag roll circumferential surface is adjusted, and the movable side nipping roll is moved around the stationary side nipping roll so that the paper running on the former does not sag or become loose. It is necessary to perform extremely complicated work such as adjusting the strength of the spring to press against the surface, and if this is neglected, the traction force against the paper stock will be insufficient if the spring's pressing force is weak. Then, the feeding of the paper by the printing cylinder of the printing device exceeds the traction of the paper by the drag roll, causing the paper to loosen and sag, causing the so-called paper flow phenomenon in which the paper shifts to the left or right while running. This causes various problems (wrinkles, paper breakage, etc.), and conversely, if the spring pressure is too strong, it may damage the paper surface or cause the paper group to be separated between the drag rolls. The minute slips that should normally occur no longer occur at all, and as a result, the strength limit of the paper is exceeded and paper breaks, which can cause various serious problems such as printing and folding having to be interrupted. It has the following problems.

Means and Function for Solving the Problems In order to solve the above problems, and especially to prevent the occurrence of the serious troubles mentioned above, in this invention, the pressing means of the IJ throttle and the movable side nipping roll are made of springs. Instead, a air cylinder is used, and means is provided on the upstream side of the drag roll to detect the running tension of each paper and convert it into an electrical signal, and the electrical signal is compared with a reference control range electrical signal corresponding to the total number of running papers, and means for outputting another electrical signal based on the comparison result, and in this way, based on the comparison result, it receives the electrical signal and outputs a pneumatic pressure corresponding to the received electrical signal. A means is provided to guide the output air pressure to the air cylinder which is the pressing means to adjust the pressing force. By providing such a means, it is possible to prevent the wallis roll dark surface from being applied to the peripheral surface of the drag roll. The pressing force of the moving side nipping roll to the stationary side nipping roll circumferential surface is automatically adjusted according to the running tension of each sheet, and as a result, the contact friction force for pulling the paper is reduced. By adjusting and stabilizing the traction effect on the paper, the running tension of the paper can be maintained at a constant state.

Example Embodiments of this invention will be described based on the drawings.

As shown in FIGS. 1 and 2, a is a floor surface, and a pair of left and right support frames 1, 1' are placed on the floor surface a at appropriate intervals.
is installed upright, and a gear 2 is installed between the support frames 1 and 1'.
A pair of front and rear fixed side nipping rolls 3 and 4 are connected to a prime mover (not shown) through a motor and rotated at a speed slightly higher than the speed at which a printing copper of a printing device (not shown) sends out paper; A pair of front and rear movable nipping rolls 3' and 4' are rotatably supported on a structure in parallel with the fixed nipping rolls 3 and 4. Each moving side d. The topping rolls 3', 4' are adapted to move along guides 5, 5', 6, 6' provided on the support frames 1, 1'; Air cylinders 9, 9',
Rods 10 and 10' are connected, and by the operation of air cylinders 9, 9', 10 and 10', the circumferential surfaces of the movable nipping rolls 3' and 4' are aligned with the circumferential surfaces of the stationary nipping rolls 3 and 4. The pressing force is determined by the output pressure of the air cylinders 9, 9' and 10, 10',
The contact friction force for pulling the paper 6 is determined.

A pair of support frames 11, 11' are erected on the support frames 1, 1' in a direction perpendicular to the support frames 1, 1'. (not shown), the peripheral speed is slightly farther than the printing speed of the printing device (not shown) and the speed at which it sends out the paper, and is slightly faster than the peripheral speed of the stationary side nipping rolls 3 and 4. A drag roll 13 driven at a circumferential speed is rotatably supported by a structure.

A support frame 11 is provided near the peripheral surface of the drag roll 13.
, 11' are swingably supported on the shafts 14 fixed to the arms 15, 152...156 and the arms 16, 162...166 fixed to the ends IJ throttles 171, 172 are rotatably supported...
・・・・・・・・・178 is attached.

Further, arms 15, 15 are swingably supported on the shaft 14.
2...156 has air cylinders 18, 182...
...188 are connected, and the air cylinders 18,
, 182...186 are oscillated by arms 19, 192...196, which are fixed to the two shafts fixed to the support frames 11 and 11'. It is supported freely. Therefore, Wallis roll 17,,17
2...176 is the air cylinder 181, 182...
・・・・・・Drag roll 1 due to the operation of 186
3, the air cylinders 181, 182
......The pressing force is determined by the output pressure of 186,
The contact friction force for pulling paper b is determined. A cutter 22 fixed to a prime mover 21 is installed at the center of the drag roll 13, and is used to cut the paper b in half.

However, there are cases where the paper b travels with half the size from the beginning, and in this case the cutter 22 is designed to be able to detach. On the support frames 1 and 1', a pair of nipping rolls are installed on the downstream side of the drag roll 13 in a substantially downward direction along the line, with their tips inserted between the fixed side and moving side nipping rolls 3, 3' and 4, 4'. Formers 23 and 23' are fixed, and 24, 24' and 25, 25' are rotatably supported at the bottom of the formers 23, 23', and paper sheets running on the formers 23 or 23' are supported. b passes between the rolls 24, 24 or 25, 25' and reaches between the nipping rolls 3, 3' or 4, 4'.

A plurality of guide rolls 2 are provided on the support frames 11 and 11'.
6・,262...'・266 and 271,272...
......276 is rotatably supported. At both ends of the guide rolls 27, 272...276, paper running tension detectors 28, 282... 286 and 28', 28'2, 28'6 are installed respectively, and paper running tension detectors 28, 282...
...286 and 28'・, 28'2, ......
Based on the paper running tension obtained in step 28'6, the paper running tension is automatically controlled by a mechanism means to be described later. Next, the operation will be explained.

A plurality of paper sheets b sent out from a printing cylinder of a printing device (not shown) are detected by tension detectors 28, . 282......2
After passing through the guide rolls 271, 272, 276, 86, 28', 28'2, 28'6, and the guide rolls 26, 262""...266, they are superimposed to form the drag roll 13. and Warisroll 17.
, 172...176, WaIJ Thrall 17,
, 172 . . . 176 presses the drag roll 13 against the circumferential surface side, and the drag roll 13 is driven and rotated at a circumferential speed slightly higher than the speed at which the printing cylinder sends out the paper b. Surrounding surface and paper b
The sheet b is pulled by the frictional force of contact with or between the overlapping sheets b and given an appropriate tension, and travels between the printing device and the drag roll 13.

Drag Roll 13 and Wa IJ Thrall 17・, 172・
The paper b pulled by 176 is sent to the downwardly inclined former 23 or 23' on the downstream side of the drag roll 13. The shape and inclination of the formers 23 and 23' are as follows:
However, if the paper becomes loose or sagging when running on the former 23 or 23', the intended vertical folding may not be performed properly. , so "formers 23 and 23'
Fixed side nipping rolls 3 installed in parallel on each downstream side
Or, paper b is introduced between the moving side nipping roll 3' or 4' and the fixed side nipping roll 3 or 4 is driven and rotates at a peripheral speed slightly lower than the peripheral speed of the drag roll 13. Moving side nipping on the circumferential surface. Press the surface between the rolls 3' or 4', and press the nipping roll 3 or 4 on the fixed side.
It is pulled by the contact friction force between the circumferential surface of the paper b and the paper b, or between the overlapping papers b. The reason why the circumferential speed of the stationary side nipping rolls 3 and 4 is slightly slower than that of the drag roll 13 is due to the difference in the area of the pressing part with respect to the width of the paper, and the transmission efficiency of the contact friction force for pulling the paper. This is due to the difference in the transmission efficiency of the contact friction force for pulling the paper by the drag roll 13 and the Wallis rolls 171, 172, . This is because the transmission efficiency of the contact friction force for pulling paper by the side nipping rolls 3' or 4' is slightly lower. Next, the operation of the mechanical means for automatically controlling the paper running tension will be described.

As mentioned above, the drag roll 13 and the IJ rolls 17, 172, etc. are sent out by the 8 printing machines of the printing device.
...Ryoshi b, which is pulled by the cooperation of 176, is a drag.

- Guide rolls 271 and 2 provided on the upstream side of the roller 13
72...276, the paper running tension detectors 28, 282...286 and 28', 28 attached to the guide rolls 27, 272...276
'2, . . . 28'6 detects the running tension of each running sheet b, converts it into an electric signal, amplifies it with an amplifier 35, and sends it to the selector switch 36. The selector switch 36 has the number of running paper sheets inputted in advance, and a reference control range electrical signal based on the number of paper sheets is selected and determined, and the paper running tension detectors 28, 282, . . .
...The electrical signals sent from 286, 28', 28'2, 28'6 via the amplifier 35 are compared with the above reference control range electrical signals, and if any one of them deviates from the reference control range. If there is an electro-pneumatic converter (e.g. JIS
B0i20-1975 Pneumatic term '3i control valve number 3
80) Send electrical signals to 31, 32, 33 and 34 to correct the output pneumatic pressure. Flea Converter 31732
, 33 and 34 are the air source 29 and the air cylinder 8,
, 182...186 or 9,9' and 10,10'
It is a device that is interposed in the piping route with and outputs pre-regulated pneumatic pressure based on the input electrical signal, and compared with the electrical signal (standard control range) based on the number of ropes sent from the selector switch 36. An electric signal corresponding to the deviation applies air pressure to the air cylinder 8, which corresponds to the electric signal.
, 182......186 or 9, 9' or blades 0, 10' all at once, and the air cylinders 81, 1
The pressing force on the drag roll 13 of the Wallis rolls 17, 172...176, which are applied with pressing force by 82...186, and the pressing force by air cylinders 9, 9' or 10, 10' The pressing force of the movable nipping rolls 3' or 4' applied to the fixed nipping rolls 3 or 4 is changed all at once. Changing this pressing force changes the contact friction force required to pull paper b, so the running tension of paper b is changed, and as a result, it is always within the standard control range based on the number of running papers b. Automatic adjustment is made so that the paper D runs with tension. Although it is originally preferable that the reference control range be narrow, the paper running tension is such that the traction force on the overlapping paper b is the drag roll 13 and the waste roll 1' roll]7,,1
Due to the co-operating traction mechanism with 72...176, all paper sheets b are not the same, and the waris rolls 17, 172...
...It is unavoidable that the closer the paper b is to 176, the weaker it becomes, so when the number of paper b is small (the number of pages is small), the reference control range is set narrowly, and the number of paper b increases ( As the number of pages increases, the control reference range must be set wider within the permissible range. Furthermore, the tension of the paper closer to the waris roll is not always weaker due to differences in the travel path, length, number of direction changes, paper quality, etc. of each paper. Therefore, if the paper running tension is detected in total after stacking paper b, even if there is paper b running with significantly insufficient tension, this state cannot be detected. Guide roll 27・,
Paper running tension detectors 28 are provided at 272...276, respectively.
,,282...286 are attached to each subject paper b
Each time, the paper running tension is detected and amplified by the amplifier 35.
By comparing the reference control range electric signal based on the number of papers, even if the total tension of all papers b or the average value change is small, it is possible to control the paper b quickly, sensitively, accurately, and reliably.
The tension can be adjusted within an allowable range depending on the number of paper sheets.
The number of running sheets b may be entered as a preset value before printing starts, but in order to achieve complete automation, the guide rolls 271, 272...
・...By a means for detecting the presence or absence of running paper (not shown) provided in section 276, or by paper running tension detectors 281, 282
. . . Another signal may be taken out from 286 and inputted.

It goes without saying that when the paper b breaks and loses its tension, the entire rotary press is stopped by a well-known paper break detection means.

Effects of the Invention Since the present invention is constructed as described in detail above, it has many excellent effects as described below.

(2) The tension of the running paper b running before and after the formers 23, 23' can be automatically maintained constant, which has the advantage of automating work, shortening work time, and saving labor.

@ The selector switch 36 selects the reference control range electrical signal corresponding to the number of sheets of paper being run, and this reference control range electrical signal and the running paper tension detectors 28, 282...
288, and based on the comparison result, the first and second cylinders 8, 182...
... Since the air pressures of 186, 9, 9', 10, and 10' are set to predetermined values depending on the number of sheets of paper running, the tension can be maintained constant regardless of the number of sheets of paper running.

■ The tension of the running paper b is detected as an electric signal, and the detection signal operates the dew-air converters 31, 32 and 33, 34 to adjust the tension, so when the tension fluctuates, the first and second cylinders 18, 182, 186 and 9,
The tension can be adjusted by immediately adjusting the air pressure of 9', 10, 10', and even minute tension fluctuations can be detected and the first and second cylinder amounts 8, 82, 186 and 9 ，
The tension can be adjusted by adjusting the air pressure at 9', 10, and 10'.
Tension can be automatically controlled sensitively, quickly and accurately.

@ Drag roll 13 and Wallis roll 17, 172 before and after formers 23, 23'...1
76, fixed side nipping rolls 3, 4, and movable side nipping rolls 3', 4', respectively, press the traveling paper b before and after the formers 23, 23' and run the paper before and after the formers 23, 23'. Since the tension of running paper b is kept constant, the tension of running paper b is kept constant when running on formers 23 and 23'.
can be bent securely.

In particular, this invention relates to tension adjustment in the former section where the running paper (strip) is subjected to extremely large frictional resistance, and can be used under complex conditions in which multiple sheets of running paper are stacked one on top of the other. In this case, when tension fluctuations begin to occur, it is necessary to quickly and precisely control the tension to the standard tension at the very beginning and at a very minute stage, so we decided to adjust the tension as described above. Detection and control commands are performed electrically, and the tension detectors 28, 282...
...286, 28'. , 28'2...28'6 measures the tension, converts the value into an electrical signal, and transmits it to the amplifier 3.
5, and is sent to the selector switch 36 as a strong and reliable electrical signal, and the selector switch 36 has a reference control range electrical signal determined, and the electrical signal is compared with this. Kameku converter 31,3
2733, 34' is sent, and air pressure suitable for adjustment is sent to cylinders 9, 9', 10, 10', 18, 182...
...Given to 188, WaIJ Thrall 171
, 172...176 and the moving side nipping roll 3
Since it controls the pressing forces of 1 and 4, it is possible to perform sensitive, quick, and accurate automatic control in immediate response to minute fluctuations in tension.

In this way, in this invention, the pressing force of the wallis roll peripheral surface against the drag roll peripheral surface and the pressing force of the movable nipping roll peripheral surface against the stationary nipping roll peripheral surface are automatically adjusted according to the running tension of the paper. As a result, the running tension of the paper can be maintained at a constant state by adjusting the contact friction force for pulling the paper and stabilizing the traction action on the paper.

Therefore, the present invention enables printing and folding by easily adjusting the running tension of paper in a rotary printing machine within a standard control range, which was conventionally done manually depending on the situation, thereby automating work and reducing work time. It is possible to shorten the time and save labor, and it also greatly contributes to production efficiency and rationalization.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a front view, FIG. 2 is a side view, and FIG. 3 is a diagrammatic illustration of the configuration of the control mechanism. 3, 4...Fixed side nipping roll, 3', turtle'...
...Moving side nipping roll, 9, 9', IQ, IQ'...
...Second shilling, 13...Drag roll, 171?1
72, 173, 174, 175, Turtle 76... Warisroll, 18,, Go 82, Evening 183, Turtle 848 185,
186...First 1 cylinder, 23, 23'... Former, 28,, 282, 283, 284, 285, 2
86... Running paper tension detector, 29... Air pressure source, 31
, 32, 339 34... Electro-pneumatic converter, 36.
...Selectacity 0. Figure 3 Figure 1 Figure 2

Claims (1)

[Claims] 1. A drag roll 13 is provided on the upstream side of the formers 23, 23', and fixed side nipping rolls 3, 4 are provided on the upstream side, respectively, and a wallis roll 17 is provided on the drag roll 13.
_1, 17_2, 17_3, 17_4, 17_5, 17
_6 to the first cylinder 18_1, 18_2, 18_3,
18_4, 18_5, 18_6, and moving side nipping rolls 3', 4' are pressed against the fixed side nipping rolls 3, 4 by second cylinders 9, 9', 10.
, 10' to press the formers 23, 23'.
The first cylinders 18_1, 18_2, 18_3 are configured to generate tension on the running paper b running in front and behind.
, 18_4, 18_5, 18_6 and the second cylinder 9
, 9', 10, 10' and the pneumatic pressure source 29 are communicated via electro-pneumatic converters 31, 32 and 33, 34, respectively, which adjust and set the supplied pneumatic pressure based on the input electric signal. First cylinders 18_1, 18_2, 18_3, 18_4, 18_5 by electropneumatic converters 31, 32 and 33, 34
, 18_6 and the second cylinders 9, 9', 10, 10' are set and adjusted, and a tension detection electric field corresponding to the tension of the running paper b is installed upstream of the drag roll 13. Running paper tension detectors 28_1, 28_2, 28_3, 28_4, 28_5, which output signals.
28_6, further selects a reference control range electric signal corresponding to the number of sheets of running paper, compares the selected reference control range electric signal with the tension detection electric signal, and based on the comparison result, the electro-pneumatic converter 31 , 32 and 33, 34 to connect the first cylinders 18_1, 18_2.
, 18_3, 18_4, 18_5, 18_6 and the second cylinders 9, 9', 10, 10' are provided with a selector switch 36 that sets the air pressure to a predetermined value depending on the number of sheets to be run. A paper running tension control device in a rotary printing press.