JP4648937B2 - Automatic web capture device for rotary printing press - Google Patents

Description

  The present invention relates to an automatic web catching device for a rotary printing press, particularly an offset printing press.

  In a rotary printing press, the printing web is inevitably broken due to the tension applied during traveling. This web tearing tends to occur between the most downstream printing unit and a dryer disposed downstream thereof. When a web tear occurs, the upstream portion of the split printing web loses guidance and wraps around the printing cylinder in the most downstream printing unit. If the upstream part of the split printing web winds around the printing cylinder, the operation of the printing press is interrupted for a long time, and the printing cylinder (especially the rubber cylinder, plate cylinder, impression cylinder) and its support and frame are damaged. There is a risk that. Furthermore, when the upstream portion of the divided printing web is wound around the printing cylinder by a plurality of layers, the printing gap between the printing cylinders is not sufficiently secured, and the printing web is not fed out normally.

  Therefore, in a conventional rotary printing press, an automatic web catching device is disposed on the upstream side of the portion between the most downstream printing unit and the downstream dryer, where web tearing is likely to occur. Conventional automatic web catching devices include a web tear sensor on the web exit side. The web tear sensor transmits a web tear signal to the control device of the automatic web catching device when the web tear occurs. As a result, the capture unit of the automatic web capture device is driven.

  The capture unit includes a capture roller disposed below the traveling printing web and a plurality of freely rotatable trolley wheels disposed above. The capture roller is rotationally driven by a motor at a peripheral speed that is slightly faster than the traveling speed of the printing web. When a web tear occurs, the trolley wheel is immediately moved downward in response to a web tear signal. As a result, the upstream part of the split printing web is sandwiched between the catching roller and the trolley wheel. Then, the web splitting pieces are pulled out from the most downstream printing unit by the catching roller and discharged downward.

  As web break detection devices, for example, those disclosed in DE3993926A1 and DE19734137A1 are known. A web edge break detection device that recognizes breakage of an edge (hereinafter simply referred to as a web edge) that extends in parallel to the web side edge and is in the length direction of the printed web is disclosed in DE10202017676A1. Is known. If the web edge is torn and separated from the printed web, the separated web edge may wrap around the printing cylinder and damage the printing press as if the web was torn.

  Sensors for recognizing web tears and web edge breaks are conventionally located on the web exit side of automatic web capture devices. When the sensor recognizes a web defect, it immediately generates a signal, drives the automatic web capture device, and stops the press. In addition, when a web defect actually occurs, the sensor generates an error signal. However, in a modern printing press with a high web running speed, the printed web vibrates or flutters, making it difficult to detect web defects without misrecognition.

In view of this, a technique has been proposed in which a compressed air nozzle is disposed on the web entry side of the automatic web capturing device and the vibration of the web is suppressed by a compressed air flow from the compressed air nozzle. In this case, the compressed air stream is blown against the lower surface of the printing web. The compressed air nozzle is configured by arranging a plurality of nozzle holes in a line. The width of the compressed air nozzle (the length of the row of nozzle holes) is about the same as the entire width of the web passage opening (the length along the web width direction).
DE3939226A1 DE19734137A1 DE10202017676A1

  The vibration and fluttering of the print web reduce the accuracy of a non-contact detector (sensor) disposed in the vicinity of the print web. Since the vibration and fluttering appear strongly at the web side end, more nozzle holes are provided near the web side end of the compressed air nozzle than near the web center.

  Here, the vicinity of the web side end where more nozzle holes are arranged means the vicinity of the web side end of the maximum width print web that can pass through the web passage opening of the automatic web catching device. Furthermore, when a relatively narrow printing web is used, the printing web is typically run in the middle of the printing press and is not run biased to one side of the printing press. Therefore, when a narrow print web is used, the compressed air flow supplied from the nozzle holes arranged more near the web side end of the maximum width print web is not applied to the print web and is wasted. Will be. The cost of constantly supplying compressed air is so high that it can be very detrimental when the width of the print web is narrow.

  In order to solve these problems, a technique has been proposed in which a compressed air nozzle is attached to an automatic web catching device so that the position can be adjusted by manually moving the compressed air nozzle in the web width direction. However, the operator may forget the position adjustment, and even if the position adjustment is made, one side of the nozzle holes arranged more at both ends is inevitably detached from the printing web.

  This invention is made | formed in view of the said situation, The place made into the objective is to provide the automatic web capture | acquisition apparatus which can reduce compressed air consumption effectively.

In order to solve the above problems, the present invention is <1> an automatic web catching device for a rotary printing press, comprising at least a slit-like web passage opening through which a printing web passes and at least one compressed air nozzle. One jetting unit, which is disposed on the web entry side of the web capturing device so as to face the web surface of the printing web, and is sprayed with stabilizing compressed air on the web surface to vibrate the printing web. The width of the jet unit is 75% or less of the width of the web passage opening. The jet unit can be adjusted in position by moving in the width direction of the print web. A first drive unit that moves and adjusts the position of the ejection unit, and the compressed air nozzle is connected to the web of the printing web. And when a printing web having a different width is used, the first driving unit is controlled in response to a control signal including positional information of the web side end, and the ejection unit is An automatic web catching device is provided, characterized in that a first drive control unit is provided which is automatically arranged at a position to be arranged adjacent to the web edge.
Here, the “width of the injection unit” refers to the length of the injection unit along the web width direction.

  In the above-described configuration, the present invention may be configured such that <2> the injection unit is provided for one and the other web side ends, and the first drive unit is provided for both of the injection units. One, or one for each, and the first drive control unit is further provided with one first drive unit for each injection unit, An automatic web catching device is provided, wherein one is provided for each of the first drive units or one for each of the first drive units.

  Further, in the above-described configuration, the present invention is characterized in that <3> the width of the injection unit is 50% or less or 25% or less of the width of the web passage opening, or the same width as the web edge. A web capture device is provided.

  Moreover, this invention provides the automatic web capture | acquisition apparatus characterized by the above-mentioned. <4> The said injection | pouring unit has the said some compressed air nozzle.

  Further, in the above configuration, the present invention, <5> an auxiliary injection unit having a plurality of auxiliary compressed air nozzles is arranged to face the web surface next to the injection unit on the web entry side, The auxiliary jet unit and the auxiliary compressed air nozzle are arranged along the web width direction over the maximum width of the printing web that can pass through the automatic web catching device on at least one side of the web surface. An automatic web capturing device characterized by the above is provided.

  Moreover, this invention provides the automatic web capture | acquisition apparatus characterized by the above-mentioned structure <5>, wherein <6> the said injection unit and the said auxiliary injection unit are arrange | positioned at the same web surface side.

  The present invention may further include: <7> including at least one monitoring unit having at least one detector for detecting the print web in a non-contact manner, and generating a monitoring signal corresponding to the detection signal of the detector. The present invention further provides an automatic web capturing device, further comprising a web monitoring device.

  The present invention also provides an automatic web catching device characterized in that, in the configuration <7>, <8> the web monitoring device is arranged on a web exit side of the automatic web catching device. .

  Further, in the configuration <7> or <8> according to the present invention, <9> the monitoring unit is included in a web tear detection device, and the web tear detection device The present invention provides an automatic web capturing device characterized in that an error signal is generated as a monitoring signal.

  Further, the present invention is the configuration <9>, wherein <10> the detector is a web break detector that generates a detection light beam that crosses the vicinity of the web side end of the web edge, and the monitoring unit includes the monitoring unit A web tear monitoring unit that is positioned near one, the other, or both of the web side ends, and the detection light beam is blocked by the printing web when the printing web is running while maintaining normal tension. On the other hand, when the printing web is torn, the automatic web catching device is provided so as not to be blocked by the printing web.

  Further, in the configuration <10> according to the present invention, <11> the web break monitoring unit includes at least one compressed air nozzle directed to the web edge, and when the web break occurs, The present invention provides an automatic web catching device characterized in that a portion of the printed web that is upstream of a tearing point is pushed down by compressed air from a compressed air nozzle.

  Further, in the above configurations <7> to <11>, <12> the monitoring unit is included in a web edge break detection device, and the web edge break detection device is included in the web edge. The present invention provides an automatic web capturing device characterized in that when a tear occurs, an error signal is generated as the monitoring signal.

  Further, the present invention is the above configuration <12>, wherein the <13> detector is an inner and outer web side edge detector arranged at intervals in the web width direction, and the monitoring unit includes the web A web side edge monitoring unit that can be moved in the width direction and adjusted to a target position in the vicinity of one, the other, or both of the web side edges, at the inner side by the inner web side edge detector at the target position; Only the detection light beam intersects the printed web, and the outer detection light beam by the outer web side edge detector does not intersect. The web side edge monitoring unit includes a second drive unit and the second drive unit. A second drive control unit that controls the unit, and one or both of the web side ends are displaced in the web width direction, the second The position is adjusted with respect to the web side edge by a driving unit, and the position adjustment of the web side edge monitoring unit is performed according to how many of the detection beams intersect the printing web, Only the inner detection light beam intersects the printed web and the outer detection light beam does not intersect. The web edge break detection device includes a comparison device, and the comparison device includes the web side edge monitoring unit. A current position signal indicating the current position of the web side edge monitoring unit is received from the second drive control unit, the current position signal is compared with a target position signal related to the target position of the web side edge monitoring unit, and the value of the current position signal is calculated. An automatic web catching device is provided that generates an error signal when the value of the target position signal deviates from a value of the target position signal to a predetermined minimum value or more. It is.

  According to the automatic web catching device of the present invention configured as described above, the jet unit that applies the compressed air to the web edge of the print web is automatically in the web width direction according to the width of the print web to be used. To adjust the position near the edge of the web. Therefore, according to the automatic web catching device of the present invention, the compressed air can be always concentrated on the vicinity of the web edge portion, and the compressed air consumed in vain can be reduced.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the rotary printing machine includes a web gripping device 6, a web cutting device 8, and at least one duplex printing unit 10 that prints both sides of the printing web 4 in order along the traveling direction 2 of the printing web 4. And an automatic web capturing device 16 according to the present invention, a dryer 18 that dries the printed print web 4, and a cooling device 20 that cools the print web 4.

  The web cutting device 8 cuts the printing web 4 when the printing web 4 is broken (breaking due to breaking in the web width direction). Thereafter, the web gripping device 6 grips the front end of the portion behind the cut portion of the printing web 4.

  The rotary printing press in the present embodiment includes two duplex printing units 10 as shown in FIG. Each double-sided printing unit 10 has two plate cylinders 11 and two rubber cylinders 12 arranged inside the plate cylinder 11 so as to face each other. The printing web 4 is printed on both sides by passing between the rubber cylinders 12 and 12.

  The automatic web catching device 16 has a slit-shaped web passage opening 22 through which the printed web 4 can pass along its traveling direction 2.

  On the web entry side 26 of the automatic web catching device 16, a jet unit 24 facing the surface (preferably the lower surface) of the printing web 4 is arranged. The injection unit 24 includes a compressed air nozzle 28 having at least one nozzle hole. The compressed air nozzle 28 supplies the compressed compressed air 30 to the web surface, and suppresses vibration or fluttering of the printing web 4. The compressed air nozzle 28 faces the web surface. The injection unit 24 is arranged so that it can move in the web width direction and change its position.

  The width of the at least one injection unit 24 in which the one or more compressed air nozzles 28 are arranged is 75% or less, preferably 50% or less or 25% or less of the width of the web passage opening 22.

  According to a preferred embodiment, the width of the jet unit 24 is comparable to the width of the web edge of the printing web 4 that the jet unit 24 faces. In addition, the width of the jetting unit 24 is the stabilizing unit supplied from the jetting unit 24 even when the rotary printing press is arranged so that the printing webs 4 having different widths are respectively arranged in the center of the printing press. The width is such that the compressed air 30 is applied only to the web edge of the printed web 4.

  The web edge is preferably no more than a quarter of the web width. According to the jetting unit 24, the compressed air mainly stabilizes the web side end side of the web edge portion, and vibration or fluttering of the printing web 4 is suppressed or avoided. A monitoring unit for monitoring the printed web in a non-contact manner can be disposed close to the web side edge.

  The jet unit 24 is disposed in the vicinity of one side edge of the printing web 4 or is disposed in the vicinity of both side edges of the printing web 4 as illustrated in FIG. 4. Since both injection units 24 are formed in the same manner, only one of the injection units 24 will be representatively described.

  Each injection unit 24 is arranged so as to be displaced in the web width direction by a drive unit (first drive unit) 32 such as a motor. Here, the web width direction coincides with the length direction of the slit-shaped web passage opening 22. The drive control unit (first drive control unit) 38 automatically controls the drive unit 32 in response to the control signal 36. The control signal 36 depends on the width of the print web 4 and indicates the position of the side edge of the print web 4. That is, the control signal 36 indicates the position where the injection unit 24 is to be disposed. The control signal 36 is transmitted from the control device of the rotary printing press. The control signal 36 includes data relating to the web width of the print web 4. The position of the side edge of the printing web 4 passing through the rotary printing press is known from a signal indicating the web width (also a signal indicating the position of the web edge). Since the control signal 36 indicates the position of the side edge of the print web 4, the ejection unit 24 is adjusted by the drive control unit 38. Therefore, the compressed air nozzle 28 is always directed to the web edge of the print web 4 regardless of the width of the print web.

  As shown in FIG. 4, one drive control unit 38 is arranged for each drive unit 32 and controls both drive units 32.

  Even if printing webs 4 having different widths are used in a rotary printing press, the center of the web coincides with the center of the rotary printing press. Therefore, it is possible to cope with the print webs 4 having different widths by simultaneously driving the jetting units 24 in opposite directions by the driving unit 32 and adjusting the positions thereof.

  When the moving speed of the printing web 4 is fast, and particularly when the web width is wide, vibration and fluttering of the printing web 4 are suppressed by the auxiliary jet unit 44. The auxiliary injection unit 44 includes an auxiliary compressed air nozzle 48 having a plurality of nozzle holes. The auxiliary compressed air nozzle 48 faces the web surface of the printing web 4, preferably the web lower surface. The auxiliary injection unit 44 extends over the entire width of the web passage opening 22. The auxiliary compressed air nozzles 48 are distributed over the entire width of the web passage opening 22. Therefore, the auxiliary compressed air 50 from the auxiliary compressed air nozzle 48 is supplied over the entire width of the printing web 4. That is, the auxiliary compressed air 50 from the auxiliary compressed air nozzle 48 is supplied against vibration over the entire width of the printing web 4. The auxiliary injection unit 44 is disposed on the web entry side 26 of the automatic web capture device 16.

  According to another embodiment of the present invention, the auxiliary compressed air nozzle 48 of the auxiliary injection unit 44 is a web of the maximum width printed web 4 through which the compressed air nozzle 28 of the injection unit 24 can pass through the automatic web capture device 16. When arranged with respect to the edge, the compressed air nozzle 28 is provided only for the region where it does not exist.

  The jet unit 24 and the auxiliary jet unit 44 are preferably arranged on the same surface side of the printing web 4. Both injection units 24, 44 are preferably arranged on the web entry side 26 of the automatic web capture device 16. Both injection units are each formed in a gun shape, and the barrel is formed to constitute a compressed air nozzle.

  The automatic web capture device 16 includes a capture roller 54 below the printing web 4 in the web passage opening 22. The automatic web capture device 16 further comprises a plurality of trolley wheels 56 arranged in a row above the printing web 4 in the web passage opening 22 and a trolley wheel carrier 58 that supports them. The trolley wheel carrier 58 is rotatable around the rotation shaft 60. The rotation shaft 60 extends in parallel with the web width direction, similarly to the rotation shaft of the trolley wheel 56. When the printing press is operating normally, the printing web 4 is also distanced in the vertical direction from the catching roller 54 and also in the vertical direction from the trolley wheel 56. The catching roller 54 and the trolley wheel 56 are arranged in parallel to each other. The space between the catching roller 54 and the trolley wheel 56 forms part of the web passage opening 22.

  The automatic web capture device 16 has a web capture control device 62 (see FIG. 2). When the web capture controller 62 receives an error signal, such as a web tear signal or a web edge break signal, the trolley wheel drive 64 is driven. Thereby, the trolley wheel 56 is moved downward toward the catching roller 54 via the trolley wheel carrier 58. As a result, the printing web 4 is sandwiched between the trolley wheel 56 and the catching roller 54. At this time, as shown in FIG. 3, the front portion 4-2 of the upstream portion 4-3 of the split printing web 4 moves downward along the direction of the arrow 2-2, and the web of the automatic web catching device 16 is moved. It falls to the exit side 52.

  The trolley wheel 56 is supported by the trolley wheel carrier 58 so as to be freely rotatable. The capture roller 54 is always rotated at a peripheral speed slightly faster than the moving speed of the printing web 4 by the motor 66 during operation of the printing press. Thereby, the catching roller 54 pulls the upstream portion 4-3 of the printing web 4 that has been broken and split from the printing unit 10 on the most downstream side. As a result, the upstream portion 4-3 of the printing web 4 does not wrap around the printing unit 10.

  The automatic web capture device 16 according to the present invention preferably comprises a web tear monitoring device. The web tear monitoring device includes at least one monitoring unit. The monitoring unit has at least one detector that detects the print web 4 in a non-contact manner, and generates a control signal according to the detection result of the detector. The web tear monitoring device is adapted to monitor web tear and / or web edge tear and / or web vibration and / or measure web speed. Hereinafter, although the example of a web tearing monitoring apparatus is described, this invention is not limited to this.

  At least one monitoring unit in the web tear monitoring device has at least one detector and is preferably arranged on the web exit side of the automatic web capture device 16.

  According to the embodiment of the present invention, the web break monitoring device has a web break detection device 68. The web tear detection device 68 generates an error signal 69 in the control device 76 when the web tear occurs.

  A web tear detection device 68 according to a preferred embodiment is shown in FIG. 5 as a view from the web travel direction. The web break detection device 68 includes at least one, preferably two, web break monitoring units 70a and 70b. The web tear monitoring units 70a and 70b are disposed in proximity to the web side ends 4-5 and 4-6 of the printing web 4, respectively. Here, the web tearing monitoring units 70 a and 70 b can be adjusted in position by inputting, for example, a position adjustment signal 71 corresponding to the width of the print web 4 to the control device 76. The position adjustment signal 71 is generated by, for example, a control device of a printing press. Each of the web break monitoring units 70a and 70b has at least one web break detector, and in this embodiment, has two web break detectors 78 and 79. The web break detectors 78 and 79 generate a detection light beam 80. The detection light beam 80 is arranged so as to cross the surface of the web edge near the web side ends 4-5 and 4-6. Therefore, the detection light beam 80 is blocked by the printing web 4 when the printing web 4 is traveling under normal tension. On the other hand, when the web tears, the detection light beam 80 is detached from the printing web 4.

  The web break detectors 78 and 79 include, for example, a transmitter 78 that generates a detection light beam 80 and a receiver 79 that receives the detection light beam 80. If the detection light beam 80 is not blocked by the tearing of the print web 4, the control device 76 generates an error signal 69 and the trolley wheel 56 is moved downward by the trolley wheel drive device 64. Thereby, the printing web 4 is gripped between the trolley wheel 56 and the catching roller 54 as shown in FIGS. 2 and 3 described above.

  The web break detectors 78 and 79 according to the preferred embodiment include at least one compressed air nozzle 74a and 74b. The compressed air nozzles 74a and 74b are directed to the web surface in the vicinity of the web side ends 4-5 and 4-6. When the web tearing occurs, the front portion 4-2 of the upstream portion of the split printing web 4 moves downward due to gravity and the pressing force by the compressed air nozzles 74a and 74b. That is, when the web tears, the side portion of the printing web 4 is removed from the detection light beam 80 more quickly by the compressed air 72a and 72b from the compressed air nozzles 74a and 74b. As a result, the error signal is generated earlier.

  The web break monitoring units 70a and 70b are preferably configured to move in the web width direction in response to the position adjustment signal 71 by the driving devices 82a and 82b. As shown in FIG. 5, the detection light beam 80 intersects a portion slightly inside from the side edges 4-5 and 4-6 of the printing web 4. The position adjustment signal 71 depends on the width of the print web 4. The position adjustment signal 71 can be provided manually. The alignment signal 71 is preferably generated and provided automatically by the controller of the automatic web capture device 16 or the controller of the printing press. With this automation, when printing webs having different widths, the web tear monitoring units 70a and 70b are automatically adjusted to the predetermined positions shown in FIG.

  The web break monitoring device includes web break detectors 78 and 79, and preferably further includes a web edge break detection device 88. If a web edge break occurs, an error signal 84 is generated as a monitoring signal. In response to the error signal 84, the trolley wheel driving device 64 is driven, and the printing web 4 is gripped between the trolley wheel 56 and the catching roller 54 (see FIGS. 2 and 3).

  A web edge break detection device 88 according to a preferred embodiment is shown in FIG. 6 as viewed from the web travel direction. The web edge break detection device 88 includes web side edge monitoring units 90a and 90b that can move in the web width direction and be adjusted to a target position. The positions of the web side edge monitoring units 90a and 90b are adjusted in the same manner as the web break detection device 68 described above, for example, by a control device of a printing press with reference to the positions of the web side edges 4-5 and 4-6.

  The target positions of the web side edge monitoring units 90a and 90b are such that the printed web 4 intersects the inner detection light beam 95 by the web side edge detectors 95c and 95d that are spaced apart from each other. 94c and 94d are positions that do not intersect with the outer detection light beam 94.

  Each of the web side edge monitoring units 90a and 90b includes drive units (second drive units) 92a and 92b. The web-side end monitoring units 90a and 90b are configured so that when one or both of the web-side ends 4-5 and 4-6 are displaced in the lateral direction, the drive units 92a and 92b are eliminated. Is adjusted with respect to the web side ends 4-5 and 4-6. After the position adjustment, as described above, the inner detection light beam 95 intersects the surface of the print web 4, but the outer detection light beam 94 does not intersect. This position adjustment is performed depending on how many of the detection beams 94 and 95 of one and / or the other of the web side edge monitoring units 90a and 90b intersect the print web 4.

  The web edge break detection device 88 includes a comparison device 96 made of an electric circuit. The comparison device 96 receives the current position signals of the web side edge monitoring units 90a and 90b from the drive control unit (second drive control unit) 93a and / or 93b. The comparison device 96 compares and calculates the current position signal and the target position signal 91, and generates an error signal 84 when the value of the current position signal deviates from the target position beyond a predetermined minimum value. Here, the current position signal is independent of the target positions of the web side edge monitoring units 90a and 90b. On the other hand, the target position signal 91 is appropriately transmitted from the control device of the printing press, and is generated based on the positions of the web side ends 4-5 and 4-6, that is, the known actual width of the print web. ing.

The error signal 84 indicates the danger that the web edge of the printed web 4 is torn. This is because if the web edge is not broken, the value of the current position signal and the value of the target position signal are the same, but if the web edge is broken, the detection beam 94, 95 and the print web 4 intersect. This is because the web side edge monitoring units 90a and 90b are adjusted in position accordingly, and the value of the current position signal deviates from the value of the target position signal.
The error signal 84 drives the automatic web capture device and ejects the printed web 4 by the trolley wheel 56 and the capture roller 54.

  All the drive devices and drive units described in this specification can be implemented by being appropriately modified. The drive device and drive unit according to the present embodiment are preferably not manually operated but controllable. Moreover, the drive apparatus and drive unit which are driven by another drive source may be sufficient. Preferably, not an electric motor such as a stepping motor, but drive control by compressed air, water pressure or an electromagnet, or a cylinder-piston device is preferable. This is because the stepping motor is used as a measure for recognizing a current position and a positional deviation between a current position of a device driven by the stepping motor and a target position.

It is a partial side view which shows roughly an example of an offset rotary printing press provided with the automatic web catching device concerning the present invention. FIG. 2 is a side cross-sectional view schematically showing a capture unit in the automatic web capture device of FIG. 1. FIG. 3 is a schematic side view showing the capture unit of FIG. 2 when a web tear occurs. It is the figure which looked at the automatic web catching device of Drawing 1 from the web passage direction. It is the figure which looked at the web break detection apparatus in the automatic web capture | acquisition apparatus of FIG. 1 along the web running direction from the web withdrawal side of the automatic web capture | acquisition apparatus. It is the figure which looked at the web edge part detection apparatus along the web running direction from the web retraction side of an automatic web capture device.

Explanation of symbols

4 Print Web 16 Automatic Web Capture Device 22 Web Passing Opening 24 Injection Unit 28 Compressed Air Nozzle 32 Drive Unit 38 Drive Control Unit (First Drive Control Unit)

Claims (13)

An automatic web capture device (16) for a rotary printing press that discharges web fragments upon detection of web breaks ,
A slit-shaped web passage opening (22) through which the printed web (4) passes;
At least one jet unit (24) with at least one compressed air nozzle (28), facing the web surface of the printed web (4) on the web entry side (26) of the web catcher (16). In order to suppress the vibration of the printed web (4) by blowing the stabilizing compressed air (30) on the web surface so as not to reduce the accuracy of detection of web breakage ,
The spray unit (24) can be moved and adjusted in the width direction of the printing web (4).
The width of the jet unit (24) is 75% or less of the width of the web passage opening (22);
A first drive unit (32) for adjusting the position by moving the injection unit (24);
The compressed air nozzle (28) is directed to the web edge of the printed web (4);
When a printing web (4) having a different width is used, the first driving unit (32) is responsive to a control signal (36) including positional information of the web side edges (4-5, 4-6). And a first drive control unit (38) is provided for automatically positioning the jet unit (24) at a position to be positioned adjacent to the web edge,
An automatic web capture device (16) characterized in that. The injection unit (24) is provided for one and the other web side ends (4-5, 4-6), respectively.
One first drive unit (32) is provided for both of the injection units (24), or one for each;
When the first drive unit (32) is provided for each of the injection units (24), the first drive control unit (38) is provided with the first drive unit (32). One for both or one for each,
An automatic web capture device (16) according to claim 1, characterized in that: The width of the injection unit (24) is 50% or less or 25% or less of the width of the web passage opening (22), or the same width as the edge of the web. Automatic web capture device (16). The automatic web catching device (16) according to any one of claims 1 to 3, wherein the injection unit (24) comprises a plurality of the compressed air nozzles (28). An auxiliary injection unit (44) having a plurality of auxiliary compressed air nozzles (48) is arranged to face the web surface next to the injection unit (24) on the web entry side (26),
The auxiliary injection unit (44) and the auxiliary compressed air nozzle (48) span at least one side of the web surface over the maximum width of the printing web (4) that can pass through the automatic web capture device (16). The automatic web catching device (16) according to any one of claims 1 to 4, wherein the web catching device (16) is arranged along the web width direction. The automatic web catching device (16) according to claim 5, wherein the jet unit (24) and the auxiliary jet unit (44) are arranged on the same web surface side. Including at least one monitoring unit (70a, 70b; 90a, 90b) having at least one detector (78, 79; 94c, 94d, 95c, 95d) for detecting the printed web (4) in a non-contact manner, A web monitoring device is further provided for generating a monitoring signal (69; 84) in response to the detection signal of the detector (78, 79; 94c, 94d, 95c, 95d). 7. An automatic web capture device (16) according to any one of the preceding claims. 8. The automatic web catching device (16) according to claim 7, wherein the web monitoring device is arranged on the web exit side (52) of the automatic web catching device (16). The monitoring unit (70a, 70b) is included in a web tear detection device (68), and the web tear detection device (68) detects an error signal as the monitoring signal when the print web (4) is torn. 9. Automatic web capture device (16) according to claim 7 or 8, characterized in that (69) is generated. The detector is a web break detector (78, 79) that generates a detection beam (80) that crosses the vicinity of the web side edge (4-5, 4-6) of the web edge,
The monitoring unit is a web break monitoring unit (70a, 70b) whose position is adjusted in the vicinity of one, the other, or both of the web side ends (4-5, 4-6),
The detection light beam (80) is blocked by the printing web (4) when the printing web (4) is running while maintaining normal tension, while the printing web (4) is torn, Not blocked by the printing web (4),
An automatic web capture device (16) according to claim 9, characterized in that. The web break monitoring unit (70a, 70b) has at least one compressed air nozzle (74a, 74b) directed to the web edge, and when the web break occurs, the compressed air nozzle (74a) The automatic web catching device according to claim 10, wherein a portion of the printed web (4) located upstream from the tearing point is pushed down by the compressed air (72a, 72b). (16). The monitoring unit (90a, 90b) is included in the web edge break detection device (88), and the web edge break detection device (88) is configured to monitor the web edge when the web edge breaks. 12. Automatic web capture device (16) according to any one of claims 7 to 11, characterized in that an error signal (84) is generated as a signal. The detectors are inner and outer web side edge detectors (94c, 94d, 95c, 95d) arranged at intervals in the web width direction,
The web-side edge monitoring unit (90a) can be adjusted to a target position in the vicinity of one, the other, or both of the web-side edges (4-5, 4-6) by moving in the web width direction. , 90b)
At the target position, only the inner detection light beam (95) by the inner web side edge detector (95c, 95d) intersects the printed web (4), and the outer side by the outer web side edge detector (94c, 94d). The detection rays (94) do not intersect,
The web side edge monitoring unit (90a, 90b) includes a second drive unit (92a, 92b) and a second drive control unit (93a, 93b) for controlling the second drive unit (92a, 92b). When one or both of the web side ends (4-5, 4-6) are displaced in the web width direction, the second drive unit (92a, 92b) Adjusted to the web side edges (4-5, 4-6),
The position adjustment of the web side edge monitoring unit (90a, 90b) is performed according to how many of the detection light beams (94, 95) intersect the print web (4), and the inner side detection Only light rays (95) intersect the printed web (4) and the outer detection light rays (94) are prevented from intersecting,
The web edge tear detection device (88) comprises a comparison device (96),
The comparison device (96) receives a current position signal indicating the current position of the web side edge monitoring unit (90a, 90b) from the second drive control unit (93a, 93b), and the current position signal and the The target position signal (91) related to the target position of the web side edge monitoring unit (90a, 90b) is compared and calculated, and the value of the current position signal deviates from the value of the target position signal to a predetermined minimum value or more. An error signal (84) is generated,
An automatic web capture device (16) according to claim 12, characterized in that:

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