JP5176597B2 - Web automatic loading apparatus and web automatic loading method of printing apparatus - Google Patents

Description

  The present invention relates to a paper automatic loading device and a paper automatic loading method in a continuous paper (web) printing device such as an electrophotographic printing device.

  A conventional continuous paper web automatic loading technique is disclosed in Patent Document 1, for example, and an example of a printing apparatus using the same will be described with reference to FIG. As shown in the drawing, the conventional automatic web loading apparatus includes a sensor 24 for monitoring the buffer amount of the web 1 provided in the buffer unit B and a paper buffer provided at the buffer unit B inlet in the printing device 28. The web 1 is fed into the buffer unit by being sandwiched and conveyed by both rollers.

  An edge guide 25 that regulates the web width direction feeding position is provided at the rear stage of the buffer part B so that the width direction feeding position of the web 1 can be easily adjusted.

  The tension adjusting roller 16 is supported by the leaf spring 17 and pressed against the fixed roller 15. By controlling the amount of deflection of the leaf spring 17, the pressing force of the web 1 against the fixed roller 15 against the tension adjusting roller 16 is changed. The tension generated in the web 1 varies depending on the winding angle between the fixed roller 15 and the web 1 and the pressing force of the tension adjusting roller 16 to the fixed roller 15. As a result, an appropriate web tension can be set for a web having various specifications.

  The shock absorbing roller 19 is rotatably fixed to the tip of the arm 18, and one end of the arm 18 is swingably attached to the printing apparatus 28 main body. The arm 18 presses the impact absorbing roller 19 against the web 1 by a spring 37 to keep the tension of the web 1 constant. The web 1 is further fed to the transfer section through a transport section composed of a drive roller 20 and a pressure roller 21 downstream in the transport direction, and a toner image is transferred and fixed on the web 1 to complete printing.

  Next, the operation of the conventional automatic web loading apparatus will be described. When roll-shaped webs without feed holes on both edges of the web are used, the leading edge of the web 1 is passed from the right side of the printing device 28 to the bottom of the printing device, the web 1 is hung outside the guide roller 30, and the web 1 is pulled upward and fed The web 1 is wound around the roller 5. At this time, the pressing roller 6 is released. Further, the web 1 is wound around the fixed roller 15 after passing through the edge guide 25. At this time, the fixed roller 15 and the pressing roller 16 are released, and both rollers are set again after passing through the web 1. The user must bend and perform operations during the series of operations described above, and the workability is very poor.

  Next, the web 1 is sandwiched between the drive roller 20 and the pressure roller 21 via the guide block 32, and the buffer plate 33 and the bridge 34 are rotated horizontally, and then the drive roller 20 is driven to drive the web. Automatic loading starts.

  The web 1 that has passed through the transfer unit 22 is fed into the buffer plate 33. The buffer plate 33 and the bridge 34 are held horizontally until a predetermined time has elapsed since the start of automatic loading, and the web 1 is fed to the fixing unit 35 by a conveyance belt (not shown) provided on the bridge 34. After the discharge from the fixing unit 35 is confirmed by the discharge detection sensor 36, the automatic web loading is completed and the printing operation is started.

JP 2002-187660 A

  Conventionally, since many operations are performed by the user at the time of automatic loading of the web and the workability is poor, it is easy to cause a loss of paper such as web breakage due to an operation error of the user. In addition, when a web jam occurs due to poor loading, the web must be laid again, and automatic loading of the web is uncertain, such as spending a lot of time for recovery. The problem to be solved by the present invention is to provide a web automatic loading device of a printing apparatus that can be operated easily and reliably by minimizing the user's operation in automatic web loading.

  A vacuum conveyance device that air-sucks and conveys the web from above is provided above the buffer section that forms the web buffer during printing, and forms an automatic conveyance path for the web that is fed directly to the printing section without going through the buffer section . When automatic loading is completed, air suction is stopped, the web is continuously fed, and the web is dropped by its own weight to form a buffer. At this time, the web conveyance roller provided in the front stage of the vacuum conveyance device is continuously driven for a predetermined time, and after the web buffer is detected by the buffer amount detection sensor, the drive roller is stopped.

  According to the present invention, automatic loading of the web can be performed with a minimum operation by the user, and problems such as generation of damaged paper due to an operation error of the user and a great amount of time for recovering the jammed are reduced. can do.

  The present invention is not limited to this embodiment, and includes various modifications that can be replaced by those skilled in the art.

  In FIG. 1, the web 1 is guided to the main body of the printing apparatus 128 by the web guide table 102 of the printing apparatus. The width direction position of the web 1 is determined by a guide and a sensor (not shown). Reference numeral 103 denotes a guide roller which is provided on the web guide table 102 and guides the web 1 into the printing apparatus main body 128 from a pre-processing device such as a paper supply device. The web guide table 102 and the guide roller 103 form a part of the paper feeding unit. The web guide table 102 is stored in the printing apparatus main body during printing. Reference numeral 200 denotes a power source of the printing apparatus 128. An automatic loading operation of the embodiment of the present invention is controlled according to a user operation by an engine controller (not shown) that controls the operation of each component.

  The web 1 of the printing device 128 has a feeding roller 105 that is rotated by a motor 104 via a driving belt 104 a and a plurality of pressure rollers 106 that are divided in the axial direction to be pressed by the feeding roller 105. The web 1 is fed by both rollers.

  FIG. 2 shows the configuration of the feeding roller 105 in detail. The pressing roller 106 can be rotated in the circumferential direction of the feeding roller 105 by rotating a knob 107. The pressure roller 106 is set at an upper position where the web 1 is conveyed horizontally at the start of automatic loading, and is set at a lower position where a loop buffer is formed on the web during printing after completion of the automatic loading. The web guide plate 108 is configured to guide the web 1 to the next step during automatic loading in conjunction with the rotation of the pressing roller 106 and to be arranged outside the loop buffer of the web 1 during printing.

  Next, FIG. 3 shows details of the vacuum transfer device 109. The vacuum transport device 109 is connected to a suction blower (not shown) and transports the upper surface of the web 1 by air suction. The vacuum conveying device 109 is provided with a conveying belt 110, a conveying belt guide 111, a driving roller 112 for driving the conveying belt 110, a driven roller 113 for applying tension to the conveying belt 110, and a suction pipe 114 connected to a suction blower. The web 1 is transported by the transport belt 110 while sucking the upper surface of the web 1 with air.

  FIG. 4 illustrates the configuration of the rear stage of the vacuum transfer device 9. A guide shaft 126 and a guide plate 127 that guide the web 1 in the direction of the transfer portion during automatic loading are provided at the subsequent stage of the vacuum belt conveying device 109. The guide shaft 126 is rotatably provided on the rotation shaft of the fixed roller 115. The guide plate 127 is movably provided by an unillustrated link mechanism and an actuator such as a solenoid, and is retracted to a retracted position indicated by a solid line during printing in order to secure a web conveyance path.

  Next, the web 1 is fed between a tension generator composed of a fixed roller 115 and a tension adjusting roller 116. The fixed roller 115 is configured as an eccentric roller having a fixed rotation shaft, and is rotated by an actuator (not shown) during automatic loading so as to be separated from the tension adjusting roller 116. During printing, the fixed roller 115 is rotated to contact the tension adjusting roller 116. At this time, the fixed roller 115 can change the pressing force against the tension adjusting roller 116 by the eccentric action according to the rotation angle, and can adjust to the optimum conveying force according to the type of the web.

  The web 1 is sandwiched between a drive roller 121 and a pressure roller 120 via an impact absorbing roller 119 fixed to the arm 118, and is sent to the transfer unit 122 via the tractor 129 by driving the drive roller 121 with a motor 138. . The tractor 129 is used for a web with a feed hole and engages with the feed hole to convey the web 1. The tractor 129 functions as a web guide when a web without feed holes is used.

  The transfer portion of the photosensitive drum 123 and the web of the present invention is a transfer roller 122, and the web 1 is more reliably conveyed by rotating simultaneously with the photosensitive drum 123 during automatic loading. Next, the web 1 is fed into the fixing unit 135 through the buffer plate 133 and the paper feeding bridge 134 as in the conventional example. At the same time that the leading edge of the web 1 is detected by a sensor 136 provided in the paper discharge unit, the air suction of the vacuum conveyance device 109 is stopped, and the web 1 is fed into the printing device 128 by the feed roller 105 and is self-weighted. Starts falling and starts buffer formation. The driving of the feeding roller 105 is further continued for a certain time, and the buffer of the web 1 is detected by the buffer amount detection sensor 124, and when the predetermined amount is reached, the driving of the buffer feeding roller 105 is controlled to stop. The web 1 forms a loop-like buffer through the above process and is held on the edge guide 125.

  Finally, the user adjusts the position in the width direction of the edge guide 125 according to the web width from this state, sets the guide shaft 126 in the groove portion of the edge guide 125, completes automatic loading, and enters a print standby state. At this time, the guide plate 127 is retracted out of the buffer unit B at the same time. As described above, by releasing the guide shaft 126 at the start of automatic loading, there is no work for winding the web around the edge guide portion.

  Adjustment of the edge guide 125 in the paper width direction is automatically performed based on this information because the width of the web 1 can be detected in advance by the guide and sensor provided on the web guide table 102 when the web 1 is loaded. Also good.

It is a schematic diagram of the printing apparatus provided with the automatic web loading apparatus of this invention. It is a schematic diagram of the front stage part of the automatic web loading apparatus of this invention. It is a top view of the vacuum conveyance apparatus for automatic web loading of this invention. It is a schematic diagram of the back | latter stage part of the automatic web loading apparatus of this invention. It is a schematic diagram of the conventional web printing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 ... Web 104 ... Drive source 105 ... Feeding roller 106 ... Pressure roller 109 ... Vacuum conveyance apparatus 115 ... Fixed roller 116 ... Tension adjusting roller 119 ... Shock absorbing roller 120 ... Pressure roller 121 ... Drive roller 124 ... Buffer amount detection sensor 125 ... Edge guide 128 ... Printer 129 ... Tractor 136 ... Discharge detection sensor B ... Buffer section

Claims (2)

In a printing apparatus having a paper feeding unit that performs printing in a printing unit using a continuous paper web and feeds the web to the printing unit, and a paper discharge unit that discharges the printed web,
A buffer section that gives a buffer in the web to the printing unit front has a drive roller mechanism at the preceding stage the buffer unit, the upper portion of the buffer portion to be conveyed to the printing part by air suction of the web from the top surface An edge guide for disposing a vacuum conveyance device, and regulating the travel position of the web in the width direction at a rear stage of the vacuum conveyance device; and a guide member configured to be rotatable to the vacuum conveyance device side and the edge guide side A web detecting means is provided in the paper discharge unit of the printing apparatus;
The suction of the vacuum conveying device is stopped after a lapse of a predetermined time after the web detection means detects the web, and further, the driving of the drive roller mechanism in the preceding stage of the buffer unit is stopped after the lapse of a predetermined time, and finally the guide member Is set on the edge guide side . The web automatic loading method of the printing apparatus according to claim 1,
Provided predetermined web buffer amount detecting means of the buffer unit, and wherein the performing simultaneously the drive stop control of the drive roller mechanism, a predetermined web buffer amount is detected in the web buffer amount detecting means of the buffer unit To automatically load the web of the printing apparatus .

Images