JP2011521808A - Air guidance in paper discharge device for sheet-fed paper printer - Google Patents

Abstract

  The paper discharge device accommodates the sheets discharged in the exit area and forms a stack (B5) in the delivery portion. The problem of dealing with the emission expansion in the delivery area is solved by the paper discharge device having the gripper chain device (1). The gripper chain device extends between the entrance area and the sheet delivery area (B4) forming the stack (B5) and also guides the sheet from the entrance area to the area (B4) TU) and upper chain belt (TO) that returns without sheet. A chain direction changing device (KU) is provided in the delivery region, and the gripper mechanism (3) that travels via the chain belt (TU) travels upward toward the chain belt (TO). The paper discharge device is provided with a spraying device (4) along the front edge (QK) of the stack (B5) in the lower region of the device (KU), and the gripper mechanism (31) traveling upwards An air curtain (5) is blown out to isolate the trajectory space to be traversed from the surroundings.

Description

  The present invention relates to a paper discharge device for a sheet-fed printing machine. The paper discharge device is used for storing sheets discharged in a sheet exit area of a printing press and stacking sheets in a delivery portion. The invention further relates to a method for performing air guidance in the sheet delivery area.

  In this type of sheet discharge device, it is common to sprinkle powder onto each sheet of paper that is being transported, particularly in order to stack the varnished material to be printed. This powder, as well as the conveyed sheet itself, can cause unwanted emissions in the area of the paper delivery device. The emission is dealt with by a suction device. At least a part of the emission discharged to the area of the paper discharge device is taken out by the suction device and supplied to the filter device.

  An object of the present invention is to provide a solution that can cope with an increase in emission in the sheet delivery area.

  According to the present invention, this problem is solved by a paper discharge device for a sheet-fed printing machine having a gripper chain device. The gripper chain device extends between a sheet entrance area and a sheet delivery area provided to form a stack of sheets, and from the sheet entry area to the sheet. It has a lower chain belt that leads to the delivery area, here it guides the sheets, and an upper chain belt that returns from the sheet delivery area to the sheet entrance area without the sheets. ing. The sheet delivery area is provided with a chain direction changing device, and the direction changing device causes the gripper mechanism that travels via the lower chain belt to travel upward toward the upper chain belt. To do. Since the paper discharge device is provided with a spraying device along the front edge of the sheet stack in the lower region of the chain direction changing device, the sheet discharge device passes through the sheet stack directed upward. The air curtain that blows upward the air flow flowing in is blown out.

  This advantageously makes it possible to create a paper discharge device that can prevent the air diffusing around the sheet delivery area caused by the gripper mechanism in a surprisingly effective manner. .

  According to a particularly preferred embodiment of the invention, the spraying device is implemented as a blower pipe that is aligned substantially horizontally and parallel to the upper front edge of the sheet stack. Preferably, the air duct is directly integrated into the front paper aligner. At this time, it is preferable that the blower pipe is disposed so as to extend at a height corresponding to the normal height of the highest position of the sheet stack.

  Preferably, an upper suction crossing path is formed in the upstream region of the chain direction changing device. Preferably, the air curtain produced by the blowing device is blown out in a targeted manner so as to flow into the upper suction crossing path.

  In a special aspect of the invention, a second spraying device is provided. The blowing device is arranged in an inner region surrounded by the chain direction changing device, and blows out a second air curtain that penetrates the track space traversed by the returned gripper mechanism. It is preferable that the second spraying device is also formed so as to have the second blower pipe.

  The air curtains blown out by the two blowing devices are preferably substantially parallel to each other. The blowing angle of the two air curtains with respect to the horizontal line is preferably in the region of 45 ° to 70 °. It is also possible to form the upper transverse path so that both air curtains can be captured together through the upper transverse path.

  The spraying device disposed in the area of the front paper aligner is preferably formed such that the first air duct is disposed on the central tube. A discharge opening is formed in the central tube and the blower tube, and the discharge opening is aligned with each other at the operating position when the paper aligner is adjusted. The paper aligning machine can swing to the original position together with the blower tube, and in the position after the swing, the discharge opening of the center tube is shifted to the position shifted from the discharge opening of the blower tube. Yes, so the spraying device is stopped.

  According to the present invention, at least one air duct that produces an air curtain is integrated into the sheet discharge device at the height of the front paper aligner. The air curtain generated here changes the direction in which air mixed with powder separates and flows, and prevents this flow from flowing out of the paper discharge device. Further, the air curtain guides air mixed with powder to a particularly effective suction section. The air mixed with the powder is intensively sucked through the sucking portion.

  With the concept according to the invention, it is further possible to form further air curtains by means of the second air duct. The air curtain encloses air mixed with powder in a predetermined space. The space is demarcated by both air curtains and protective covers (Verschutzung) (front, top, side).

  In the concept according to the invention, the removal of the test sheets and the visibility into the stack and delivery areas are not disturbed by mechanical elements. Further, a staying space is formed instead of being sprayed directly on the suction part. The air mixed with the powder can be discharged from the paper discharge device only from the staying space via the suction section.

  As already explained, the air duct can be integrated into the “front paper aligner” assembly at the leading edge of the stack. In order to partition the air collection space toward the rear, a second blower tube may be selectively provided.

  The spraying device according to the present invention may have a mechanism for opening and closing the air discharge path. The fixed tube may be integrated into the front paper aligning machine, and compressed air may be supplied from the inside. In the operating position, the compressed air flows out through the aligned openings and forms an air curtain. In the test sheet take-out position, the paper aligner rotates 90 ° with the outer tube, but the inner tube does not move. Thereby, the outflow of air is prevented.

  Further, an air inflow opening may be formed in the area of the upper protective cover of the paper discharge device. Through the inflow opening, outside air is sucked in by the blowing frame and conveyed downward. Below the spray frame, air is captured by the gripper mechanism and washed away. In the turning zone, the air flow is separated. Thereafter, the air flow is redirected upward by the blower pipe and is discharged from the paper discharge device through the suction part. Preferably, a second blower pipe is provided, and the blower pipe prevents air mixed with powder from reaching the rear region of the paper discharge device through the gripper mechanism.

  The blower tube may be configured to include a plurality of blower nozzles continuous in the longitudinal direction. Thereby, the air flow blown out with a target each time forms an air curtain. The nozzle can also be formed as a grooved nozzle. The blower tube may be configured so that the cross section of the blower nozzle, particularly the blower groove, is adjustable and variable. In particular, the air duct can also be formed, for example, by two longitudinal shells (Laengsschale) so as to consist of a plurality of parts, or it can also be deformable by elasticity. Thereby, for example, the cross section of the blower nozzle can be set by elastic expansion or collision of the longitudinal groove portion formed in the blower tube. Furthermore, it is also possible to arrange a small air guide rod or guide plate near the blower nozzle. Thereby, it is possible to realize the conveyance and acceleration in which the ambient air is targeted. This concept makes it possible to achieve a particularly advantageous air velocity profile inside the air curtain, in particular in the observation plane in the radial direction with respect to the longitudinal axis of the blower tube. The blower tube may be provided with a jacket made of a sound absorbing material, particularly foamed rubber. This makes it possible to absorb the sound produced in the area of the blowing nozzle to a considerable extent.

  The blower tube may be configured such that the jet air can be utilized at a relatively high pressure level by compressed air induction. As another option, it is also possible to provide a blower in the area of the blower tube. Necessary blast air is sucked by the blower and is conveyed at a pressure level suitable for forming an air curtain that can sufficiently withstand the load. The blower pipe device according to the present invention can be implemented as a set of additional equipment, and is attached to or attached to a general front paper aligning machine without causing any particular burden on the installation. Is possible.

  The problem described at the outset is further solved by a method comprising the features as claimed in claim 13.

  Further details and features of the invention will become apparent from the description with the following figures.

It is the schematic for demonstrating the structure of the paper discharge apparatus for sheet paper printing machines which concerns on this invention. FIG. 5 is a further schematic diagram for illustrating the configuration of a sheet-fed press output device having a surrounding and ventilated spray frame disposed above a sheet delivery area according to the present invention. It is a functional diagram for illustrating the blower pipe concerning the present invention in a blower position. FIG. 3b is a functional diagram for illustrating the air duct according to FIG. 3a in the stop position.

  FIG. 1 is a diagram simply showing a front area of a sheet discharge device for a sheet-fed paper printer. The paper discharge device has a gripper chain device 1. The gripper chain device 1 extends between a sheet entry area, not shown in detail here, and a sheet delivery area BA provided to form a sheet stack BS.

  The gripper chain device 1 has a chain belt TU that guides the sheet and a sheet delivery area BA from the sheet entrance area to the sheet delivery area BA. On the other hand, it has an upper chain belt TO which is returned without a sheet.

  Above the leading edge QK of the sheet stack BS, there is provided a chain direction changing device KU that is also implemented as a chain guide track or, if necessary, a chain wheel. The gripper mechanism 3 that travels via the lower chain belt TU travels upward toward the upper chain belt TO by the chain direction changing device KU.

  The paper discharge device according to the present invention is excellent in that the spraying device 4 is provided along the front edge QK of the sheet stack BS in the lower region of the chain direction changing device KU. This is to blow out the air curtain 5 that is directed upward and that at least as far as possible isolates the orbital space traversed by the gripper mechanism 3 traveling upward.

  The air flow VK that is about to be discharged and is contaminated in some cases is prevented from flowing to the periphery upstream of the paper discharge device by the air curtain 5 and is driven into the suction section 6.

  In this embodiment, the spraying device 4 is implemented as a blower pipe. The air duct is integrated in a paper aligner not shown in detail here, and the final position of the edge QK of the sheet stack BS is also determined by the paper aligner.

  In the embodiment shown here, the spraying device 4 extends at a height corresponding to the normal height HB at the highest position of the sheet stack BS.

  In this embodiment, the suction device 6 is formed as an upper suction crossing path in the upstream region of the chain direction changing device KU. Although not shown here, the air curtain 5 can be blown out so as to flow into the upper suction crossing path.

  In the embodiment shown here, a second spraying device 7 is further provided. The blowing device 7 is arranged in an inner region surrounded by the chain direction changing device, and blows out the second air curtain 8 penetrating the track space traversed by the returned gripper mechanism 3 '. In the said Example, the 2nd blowing apparatus 7 is formed of the ventilation pipe | tube which has a corresponding ventilation nozzle.

  Preferably, both spray devices are formed such that the two air curtains 5, 8 are substantially parallel to each other. The blowing angle of the two air curtains with respect to the horizontal line is in the region of 45 ° to 70 ° in this embodiment. Here, both air curtains may be formed such that both air curtains are captured by the upper absorption crossing path. A “cross-bar” space defined between the two air curtains is used as an air guide space. Due to the space, the air flow VK, which may have been contaminated and entered the turning zone KU, is effectively introduced into the suction device 6. The air curtain 5 can isolate the air flow VK flowing through the front edge from the front periphery of the paper discharge device. The trajectory of the upper gripper chain belt TO that allows the air flow VK to be guided in a limited manner by the second air curtain 8 and that follows the subsequent portion, ie the turning zone KU. It can be isolated from the space. Furthermore, the air curtain 8 enables a reliable traverse scavenging of the returned orbital space of the gripper mechanism 3 '.

  The above description is valid for the embodiment shown in FIG. In this embodiment, a spray frame 10 is provided above the lower gripper chain belt TU and above the delivery area BA. The spray frame 10 is ventilated through an opening area 12 provided in the machine protection cover 11. This concept prevents the blowing frame 10 from excessively drawing air from the inlet area of the paper discharge device. In addition, the concept allows further scavenging of the gripper mechanism trajectory space that is returned above the blowing frame 10 by air flowing through the opening 12.

  The air flow blown by the blowing devices 4 and 7, the intake volume flow discharged by the suction device 6, the conveying capacity of the blowing frame, and the outflow of air through the opening region 12 are preferably adjusted by the control device. . The controller is configured to allow the air flow to be adapted to current machine operating conditions based on parameters or other performance characteristics. Thereby, for example, when the number of delivery cycles is large, the spraying ability is correspondingly set high.

  FIG. 3a shows a particularly preferred embodiment of the spraying device 4 according to the invention. In the modified example, the first blower pipe 40 is disposed on the central pipe 41. Discharge openings 42 and 43 are formed in the central tube 41 and the blower tube 40, and the openings are aligned with each other at the operating position when the paper aligner 44 is adjusted.

  As apparent from FIG. 3b, the paper aligning machine 44 can swing around the central tube 41 together with the blower tube 40 to the original position. In the position after swinging shown here, the discharge opening 42 of the central tube 41 is in a position displaced with respect to the discharge opening of the blower tube and is therefore blocked. The spacing shown here is merely to facilitate element identification. Specifically, the distance is determined only to match the play required to move sufficiently smoothly.

DESCRIPTION OF SYMBOLS 1 Gripper chain apparatus 3 Gripper mechanism 3 'Returned gripper mechanism 4 Spraying apparatus 40 1st ventilation pipe 41 Center pipe 42,43 Discharge opening part 44 Paper aligning machine 5 Air curtain 6 Suction apparatus 7 2nd spraying apparatus 8 8th 2 Air curtain 10 Blowing frame 11 Machine protection cover 12 Opening area BA Sheet delivery area BS Sheet stack HB Normal height KU Chain turning device QK Stack leading edge TO Upper chain belt TU Lower chain belt VK air flow

Claims (14)

A paper discharge device for a sheet-fed printing machine having a gripper chain device (1),
The gripper chain device (1) extends between a sheet entry area and a sheet delivery area (BA) provided to form a sheet stack (BS), and the sheet A lower side, here a chain belt (TU) for guiding the sheet, from the sheet entrance area to the sheet delivery area, and from the sheet delivery area (BA) to the sheet entry area It has an upper chain belt (TO) that is returned without a sheet of paper,
The sheet delivery area (BA) is provided with a chain turning device (KU),
The gripper mechanism (3) that travels via the lower chain belt (TU) by the chain direction changing device (KU) is moved upward toward the region of the upper chain belt (TO). In
A spraying device (4) is provided along the front edge (QK) of the sheet stack (BS) in the lower region of the chain direction changing device (KU),
Thereby, an air curtain (5) which is directed upward and which pushes up an air flow (VK) flowing in through the sheet stack (BS) is blown out. Paper discharge device.   2. The paper discharge device according to claim 1, wherein the spraying device (4) is implemented as a blower pipe (40).   3. The paper discharge device according to claim 2, wherein the spraying device (4) is integrated in a front paper aligning machine (44).   The said spraying device (4) extends at a height (HB) corresponding to a normal height of the highest position of the sheet stack (BS). The paper discharge device described.   The paper discharge device according to any one of claims 1 to 4, wherein an upper suction crossing path (6) is formed in an upstream region of the chain direction changing device (KU).   The air curtain (5) is blown out with a target so as to drive the air flow (VK) flowing into the air curtain into the upper suction crossing path (6). The paper discharge device described in 1.   A second spraying device (7) is provided, the spraying device being arranged in the inner region surrounded by the chain turning device (KU) and traversed by the returned gripper mechanism The paper discharge device according to any one of claims 1 to 6, wherein the second air curtain (8) penetrating the space is blown out.   8. The paper discharge device according to claim 7, wherein the second spraying device (7) has a second blower pipe.   The paper discharge device according to claim 7 or 8, wherein the two air curtains (5, 8) are substantially parallel to each other.   10. The paper discharge device according to claim 9, wherein a blowing angle of the two air curtains (5, 8) with respect to a horizontal line is in a range of 45 [deg.] To 90 [deg.].   11. The paper discharge device according to claim 10, wherein both of the two air curtains (5, 8) are formed so as to be caught by the upper suction crossing path (6).   The 1st ventilation pipe (40) is arrange | positioned on the center pipe (41), The discharge opening part (42, 43) is formed in the said center pipe (41) and the said ventilation pipe (40). When the paper aligner (44) is adjusted, the discharge openings are aligned with each other at the operating position, and the paper aligner (44) swings to the original position together with the blower pipe (40). In the position after swinging, the discharge opening (43) of the central tube is offset with respect to the discharge opening (42) of the blower tube (40), and therefore The paper discharge device according to any one of claims 1 to 11, wherein the spraying device is stopped. In a method for performing air guidance in a sheet delivery area of a sheet discharge device,
The air flowing into the leading edge region of the sheet stack and flowing across the region is redirected by an air curtain that blows out from the edge region of the sheet stack, and the gripper mechanism travels. A method, characterized in that it is driven into a suction part located above the area and close to the gripper chain turning device area.   The suction part is arranged at the height at which the gripper mechanism is returned and in front of the sheet stack or directly in front of the gripper chain direction changing device region at the inner corner of the discharge device protective cover. The method according to claim 13.