JP4619305B2 - Transport mechanism, transport mechanism control method, and transport method - Google Patents

Description

  The present invention relates to a transport mechanism that transports a sheet that has been printed on a sheet-fed printing press to a paper discharge unit, a control method for the transport mechanism, and a transport method.

  As a transport mechanism that transports printed sheets to the paper discharge unit in the sheet-fed printing press, the sheet is transferred from the paper discharge cylinder that receives the printed sheets to the gripper of the transport unit, and the gripper A configuration is known in which a gripper is conveyed to the upper side of a sheet discharge table by a conveyance chain while a sheet is held, and a sheet is placed on the sheet discharge table.

  When such a sheet is transported, the paper edge (rear end) of the sheet may flutter depending on the sheet transport speed. Also, the fluttering may vary depending on the thickness of the sheet.

A configuration in which air is blown onto a sheet by a blower is known in response to such fluttering of the sheet. Further, a configuration is also known in which a blower having different openings is used by switching between a case where thick paper is transported and a case where thin paper is transported (see, for example, Patent Document 1).
JP 2000-108306 A

  However, such a conventional configuration has the following problems. That is, when the paper thickness is different, simply changing the air blowing mode may still lack stability during conveyance, and after gripping with a gripper, the paper edge of the gripped sheet may be When the printing surface in the vicinity comes into contact with the next gripper, the printing surface may be damaged.

  The present invention has been made to solve the problems of the prior art, and more effectively suppresses fluttering, can transport a sheet stably and without damage, a transport mechanism control method, and transport. It aims to provide a method.

A transport mechanism according to the present invention is a transport mechanism that transports a printed sheet, and transports a sheet that has been printed, and is hung between an upstream sprocket and a downstream sprocket. the conveyor chain to be wound, supply and conveying unit in which a plurality of grippers mounted at predetermined intervals for gripping receives sheets having been subjected to printing, the two-fed trajectory of the gripper of the conveying portion of the sheet to order a paper discharge cylinder disposed below the upstream sprocket to pass sheets from the delivery drum to the gripper, the sheet passing region formed between the upstream sprocket and delivery cylinder A first blower that blows air toward the lower surface of the discharge cylinder, and is provided above or downstream of the sheet delivery area and toward the sheet delivery area. Blow air 2 comprises a blower, a common air supply source to the first blower and the second blower, and a switching means for enabling selective use of the first blower and the second blower, depending on the paper thickness of the sheet Thus, the switching means is switched .

  According to the transport mechanism having the above configuration, the printed sheet is delivered from the paper discharge cylinder that receives the printed sheet to the transport unit, and the transport chain circulates so that the transport chain is attached to the transport chain. The sheets gripped by the gripper are sequentially conveyed. Here, a first blower and a second blower for blowing air before and after delivering the sheet from the paper discharge cylinder to the gripper are provided. In other words, the first blower is configured to blow air toward the bottom of the sheet on the sheet discharge cylinder from the sheet discharge cylinder to the gripper, and the second blower is configured so that the gripper removes the sheet. The gripped sheet is configured to blow air toward a portion that does not pass through the area where the sheet is transferred from the discharge cylinder to the gripper.

  The first blower is provided on the upstream side of the area where the sheet is transferred from the sheet discharge cylinder to the gripper, and blows air toward the surface of the sheet discharge cylinder so that the sheet is separated from the sheet discharge cylinder. To prevent. On the other hand, the second blower is provided above or downstream of the area where the sheet is transferred from the discharge cylinder to the gripper, and blows air toward the area where the sheet is transferred from the discharge cylinder to the gripper. Thus, air is blown so that the sheet does not come into contact with the next gripper.

  In this way, the first blower is used to blow air so that the sheet is not separated from the sheet discharge cylinder, thereby preventing damage to the printing surface due to flaking of the sheet from the sheet discharge cylinder. be able to. This is particularly effective when transporting thin paper that is likely to flutter at that location. In addition, by using the second blower to blow air so that the sheet does not contact the next gripper, the paper edge of the sheet held by the gripper contacts the next gripper. It is possible to prevent damage and disturbance of paper discharge at the paper discharge unit. This is particularly effective when transporting thick paper that is likely to flutter at that location.

  As described above, by installing a plurality of blowers at appropriate positions, it is possible to more effectively suppress fluttering and to transport the sheet stably and without being damaged.

Moreover, it is comprised so that an air supply source common to a 1st blower and a 2nd blower may be comprised.

  In this case, air is supplied from a common air supply source when either the first blower or the second blower is operated. As a result, space can be saved and costs can be reduced.

Moreover, it comprises so that the switching means which enables selectively using a 1st blower and a 2nd blower is comprised.

  In this case, only the first blower or the second blower can be used by the switching means. Depending on the case, it is possible to use both at the same time or not to use both. As described above, since various usage modes of the blower can be realized, an optimal mode can be selected according to the sheet thickness of the sheet.

  Here, when transporting thin paper with a sheet thickness less than a predetermined value, air should be supplied so that the sheet is not separated from the discharge cylinder before the sheet is transferred from the discharge cylinder to the gripper. Spray. On the other hand, when transporting thick paper whose sheet thickness is equal to or greater than a predetermined value, air is blown so that the sheet does not come into contact with the next gripper after the sheet is delivered from the discharge cylinder to the gripper. .

  In this way, when transporting thin paper that is likely to flutter in the paper discharge cylinder, the sheet is peeled off and fluttered by blowing air so that the sheet does not separate from the paper discharge cylinder. It is possible to prevent the printed surface from being damaged. Also, when transporting thick paper that tends to flutter near the gripper, air is blown so that the sheet does not come into contact with the next gripper, so that the paper edge of the sheet gripped by the gripper becomes the next gripper. It is possible to prevent the printing surface from being damaged by touching the paper and the paper discharge at the paper discharge unit from being disturbed.

  As described above, by blowing air to different locations according to the thickness of the sheet to be conveyed, it is possible to more effectively suppress fluttering and convey the sheet stably and without being damaged.

  According to the transport mechanism and the control method thereof according to the present invention, by installing a plurality of blowers at appropriate positions, it is possible to suppress flutter more effectively and transport the sheet stably and without being damaged.

  Further, according to the transport method according to the present invention, the air is blown to different places according to the thickness of the sheet to be transported, thereby suppressing the flutter more effectively and transporting the sheet stably and without being damaged. be able to.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a view showing a transport mechanism according to an embodiment of the present invention.

  The transport mechanism 1 according to the present invention is a transport mechanism that transports a printed sheet 2 to a paper discharge unit 3, and is provided between the printing unit 4 and the paper discharge unit 3. A transport unit 11 in which a plurality of grippers 112 for gripping a sheet 2 are attached to a circulating transport chain 111 at predetermined intervals, and a trajectory of the gripper 112 of the transport unit 11 receives a sheet 2 after printing. And a paper discharge cylinder 12 for supplying the sheet 2 to the paper. In addition, the transport mechanism 1 includes a transfer cylinder 15 that is in contact with the paper discharge cylinder 12 and that is in contact with the final printing cylinder 41 of the printing unit 4, so that the printed sheet 2 can be removed from the final printing cylinder 41. Delivered to the discharge cylinder 12.

  The transport unit 11 includes a pair of sprockets 113 a and 113 b that wrap around the transport chain 111. By rotating the sprockets 113a and 113b, the transport chain 111 circulates, and along with this, the plurality of grippers 112 sequentially receive the sheet 2 from the paper discharge cylinder 12 in the lower transport chain 111 (upstream side). It moves from the vicinity of the sprocket 113a) toward the paper discharge unit 3 (in the vicinity of the downstream sprocket 113b). The gripper 112 grips the sheet 2 supplied from the sheet discharge cylinder 12 in the sheet delivery region R in the vicinity of the upstream sprocket 113a while being circulated by the transport chain 111. When the gripper 112 moves to the upper part of the paper discharge unit 3 near the downstream sprocket 113 b while holding the sheet 2, the gripper 112 releases the sheet 2 and places it on the paper discharge tray 31. The paper discharge table 31 moves up and down according to the amount of the sheets 2 placed on the paper discharge table 31.

  When the sheet 2 transferred from the transfer cylinder 15 to the sheet discharge cylinder 12 is transferred to the gripper 112, the paper end (rear end) of the sheet 2 may jump up due to the rigidity of the sheet 2. When the paper edge of the sheet 2 jumps up in this way, the sheet 2 does not come into close contact with the sheet discharge cylinder 12 and is separated, causing flapping. If fluttering occurs, it may be in contact with other structures or the like of the transport mechanism 1 to cause a transport failure of the sheet 2 or cause damage to the printing surface or the sheet 2 itself. In order to prevent contact with other structures or the like due to the flapping, a guide body 16 is provided outside the sheet contact area of the discharge cylinder 12. However, when the sheet thickness of the sheet 2 is thinner than a predetermined value, the flapping between the guide body 16 and the paper discharge cylinder 12 still easily occurs, which is not preferable.

  In order to prevent this, the transport mechanism 1 according to the present embodiment prevents the sheet 2 from being separated from the sheet discharge cylinder 12 before delivering the sheet 2 from the sheet discharge cylinder 12 to the gripper 112. A first blower 13 for blowing air to the leaf paper 2 is provided. More specifically, the first blower 13 is attached to the upper (downstream) end of the guide body 16 so as to blow air toward the surface of the paper discharge cylinder 12 provided on the upstream side of the sheet delivery region R. It has been.

  The first blower 13 separates the sheet 2 from the sheet discharge cylinder 12 with respect to the sheet 2 moved by the sheet discharge cylinder 12 before delivering the sheet 2 from the sheet discharge cylinder 12 to the gripper 112. Air is blown so as not to occur (see arrow B1 in FIG. 1). More specifically, the first blower 13 blows air toward the paper bottom of the sheet 2 on the paper discharge drum 12 from the paper discharge drum 12 to the gripper 112. Furthermore, in the present embodiment, air is blown toward the upstream side of the direction perpendicular to the sheet 2 (the central direction of the discharge cylinder 12) (that is, the direction of the blown air is the center of the discharge cylinder 12). Directional component and upstream tangential component).

  As described above, the first blower 13 is used to blow air so that the sheet 2 is not separated from the sheet discharge cylinder 12, whereby the sheet 2 is peeled off and fluttered from the sheet discharge cylinder 12. Can prevent damage. This is particularly effective when transporting thin paper that is likely to flutter at that location. In addition, by blowing air at an upstream side, it is possible to prevent the paper bottom from being rolled up immediately after the paper bottom of the sheet 2 passes through the air blowing location.

  On the other hand, when the sheet 2 is transferred from the sheet discharge cylinder 12 to the gripper 112, the sheet 2 may be separated from the sheet discharge cylinder 12 (the upstream sprocket 113a facing the sheet discharge structure). Not in pressure contact with the body 12). At this time, if the sheet 2 is separated from the paper discharge cylinder 12, the gripper 112 may be brought into contact with the sprocket 113a, 113b. If the sheet 2 comes into contact with the next gripper 112, it may cause a conveyance failure of the sheet 2 or damage the printing surface or the sheet 2 itself. In particular, when the thickness of the sheet 2 is thicker than a predetermined value, the rigidity of the sheet 2 is large and tends to be separated from the paper discharge cylinder 12. This is because, for example, when the paper end of the sheet 2 is in contact with the guide body 16 before the sheet 2 is delivered from the paper discharge cylinder 12, the printing surface is rubbed only by contacting the guide body 16. Although there is no problem, the repulsive force (biasing force) is generated in the sheet 2 by the contact with the guide body 16, so that the urging force is released at the upper end of the guide body 16, and the sheet This is because the paper 2 springs up.

  In order to prevent this, the transport mechanism 1 according to the present embodiment transfers the sheet 2 from the sheet discharge cylinder 12 to the gripper 112 and then prevents the sheet 2 from contacting the next gripper 112. And a second blower 14 for blowing air against the paper 2. More specifically, the sheet 2 is provided on the downstream side of the sheet delivery region R, and is provided on the downstream side of the sheet discharge cylinder 12 so as to blow air toward the delivery region R. On the other hand, a second blower 14 is attached to a powder sprayer 17 for spraying powder from above. The powder sprayer 17 sprays the powder onto the printing surface of the sheet 2 in order to prevent the overlapping sheets 2 from sticking when the sheets 2 are placed on the paper discharge tray 31. .

  The second blower 14 transfers the sheet 2 from the paper discharge cylinder 12 to the gripper 112 and then moves the sheet 2 to the next (upstream) gripper with respect to the sheet 2 that is gripped and moved by the gripper 112. Air is blown downward so as not to contact 112 (see arrow B2 in FIG. 1). More specifically, the second blower 14 blows air toward a location that does not pass the transfer region R in the sheet 2 after the gripper 112 grips the sheet 2. Furthermore, in this embodiment, air is blown toward the upstream side of the direction perpendicular to the sheet 2 (the direction perpendicular to the track of the gripper 112) (that is, the direction of the blown air is directed to the track of the gripper 112). With a vertical direction component and an upstream parallel component).

  Thus, by using the second blower 14 to blow air so that the sheet 2 does not come into contact with the next gripper 112, the paper end (rear end) of the sheet 2 gripped by the gripper 112 is moved. It is possible to prevent damage to the printing surface due to contact with the next gripper 112 and disturbance of paper discharge in the paper discharge unit 3. This is particularly effective when transporting thick paper that is likely to flutter at that location. In addition, by blowing air at an upstream side, it is possible to prevent the paper bottom from being rolled up immediately after the paper bottom of the sheet 2 passes through the air blowing location. In the present embodiment, the configuration in which the second blower 14 is provided on the downstream side of the delivery region R has been described. However, the present invention is not limited to this, and the delivery is performed on the sheet 2 after the gripper 112 grips the sheet 2. In order to prevent a portion not passing through the region R from rolling up, it may be provided above the transfer region R and air may be blown toward the transfer region R.

  As described above, by installing the plurality of blowers 13 and 14 at appropriate positions, it is possible to more effectively suppress fluttering and transport the sheet 2 stably and without being damaged. Then, by blowing air to different locations according to the thickness of the sheet 2 to be conveyed, it is possible to more effectively suppress fluttering and to convey the sheet 2 stably and without being damaged.

  In this embodiment, as shown in FIG. 1, the air supply source 18 common to the first blower 13 and the second blower 14 is provided.

  In this case, air is supplied from the common air supply source 18 when either the first blower 13 or the second blower 14 is operated. More specifically, air is supplied from the air supply source 18 to the blowers 13 and 14 via the bifurcated pipe 19. The air supply source 18 is, for example, an air compressor. As a result, space can be saved and costs can be reduced.

  Moreover, in this embodiment, it is comprised so that the switching lever 191 may be comprised as a switching means which can selectively use the 1st blower 13 and the 2nd blower 14. FIG. More specifically, a switching lever 191 for switching to use either the first blower 13 or the second blower 14 is attached to the bifurcated tube 19, and the user switches between the two as appropriate.

  In this case, only the first blower 13 or the second blower 14 can be used by the switching lever 191 as switching means. This can be realized by providing valves (not shown) at the bifurcated portions of the bifurcated pipe 19 and switching the opening and closing of the valves by the switching lever 191. That is, in FIG. 1, when the switching lever 191 is in the A position, the air supply path a to the first blower 13 is opened (the valve is opened) in the bifurcated pipe 19 and the air supply to the second blower 14 is performed. The path b is blocked (the valve is closed). When the switching lever 191 is in the B position, the air supply path b to the second blower 14 is opened (the valve is opened) in the bifurcated pipe 19 and the air supply path a to the first blower 13 is blocked. (Valve closed). Thereby, the optimal air blowing position can be selected as appropriate according to the thickness of the sheet 2 on which printing is performed.

  Note that the switching unit 191 is not limited to the mechanical mechanism as in the present embodiment, and a configuration in which one or both of the valves are opened and closed by switching the switch is possible. A configuration may be adopted in which the paper thickness of the paper 2 is automatically switched by inputting to the printing machine. In some cases, both can be used at the same time or neither can be used. For example, using two predetermined values for the paper thickness (first predetermined value> second predetermined value), the type of the sheet 2 is thick (first predetermined value or more), medium (first predetermined value). Less than the value and greater than or equal to the second predetermined value) and thin paper (less than the second predetermined value). In the case of thin paper, only the first blower 13 is activated, and in the middle case both are stopped. In the case of cardboard, only the second blower 14 may be operated. As described above, since various usage modes of the blowers 13 and 14 can be realized, an optimal mode can be selected according to the sheet thickness of the sheet 2.

  The embodiment according to the present invention has been described above, but the present invention is not limited to the above embodiment, and various improvements, changes, and modifications can be made without departing from the spirit of the present invention.

It is a figure which shows the conveyance mechanism which concerns on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Conveyance mechanism 11 Conveyance part 111 Conveyance chain 112 Gripper 12 Paper discharge cylinder 13 1st blower 14 2nd blower 18 Air supply source 191 Switching lever (switching means)
2 sheets 3 Paper delivery section

Claims (1)

A transport mechanism for transporting a printed sheet;
A transport unit in which a plurality of grippers for gripping sheets are attached to a transport chain that is hung around the upstream sprocket and the downstream sprocket ;
A paper discharge cylinder disposed below the upstream sprocket to receive the printed sheet and supply the sheet to the gripper track of the transport unit;
To pass the gripper to the sheet from the delivery drum, than the sheet transfer region formed between the upstream sprocket and delivery cylinder provided upstream, delivery cylinder surface positioned below A first blower that blows air toward the
A second blower that is provided above or downstream of the sheet delivery area and blows air toward the sheet delivery area;
A common air supply for the first and second blowers;
Switching means for selectively enabling use of the first blower and the second blower,
A conveying mechanism characterized in that the switching means is switched according to the sheet thickness of the sheet .

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