US20090166958A1

US20090166958A1 - Sheet-Discharging Apparatus for Sheet-Fed Printing Press

Info

Publication number: US20090166958A1
Application number: US12/225,542
Authority: US
Inventors: Toshio Miwa; Nobutaka Sato
Original assignee: Mitsubishi Heavy Industries Ltd
Current assignee: Mitsubishi Heavy Industries Ltd
Priority date: 2006-03-30
Filing date: 2007-03-06
Publication date: 2009-07-02
Also published as: CN101360672A; EP2006230A2; JP2007261804A; WO2007113970A1

Abstract

To provide a sheet-discharging apparatus for a sheet-fed printing press in which a fan device is downsized, the visibility of an operator is improved, cleaning operation of the fan device is carried out easily, and a blast fan may be shifted easily and quickly to a desired position according to the size or the material of a sheet to be printed. There is provided a sheet-discharging apparatus for a sheet-fed printing press including: a fan device having a plurality of blast fans and a frame for mounting the blast fans, in which at least some of the plurality of blast fans are arranged in contact with the lower surface of a frame body corresponding to elongated openings formed on the thin-plate shaped frame body which constitutes the frame, and are slidable in the feeding direction and/or in the widthwise direction with respect to the frame body.

Description

RELATED APPLICATIONS

The present application is based on, and claims priority from, Japanese Application Number 2006-093346, filed Mar. 30, 2006, the disclosure of which is hereby incorporated by reference herein in its entirety.

TECHNICAL FIELD

The present invention relates to a sheet-discharging apparatus for a sheet-fed printing press.

BACKGROUND ART

As a sheet-discharging apparatus for a sheet-fed printing press, for example, the one disclosed in Patent Citation 1 is known.
Patent Citation 1: Japanese Unexamined Patent Application Publication No. 2002-234654

DISCLOSURE OF INVENTION

The sheet-discharging apparatus for a sheet-fed printing press disclosed in Patent Citation 1 is provided with a fan device having a plurality of blast fans above a sheet-discharging table. Each blast fan is suspended and supported by a suspending bar extending between frames via a specific bracket having a thickness in the direction of height (vertical direction). Therefore, the dimension of the fan device in the direction of height is increased, so that there arises a problem that the fan device is upsized, and hence visibility of an operator (personnel) is blocked.
Since the bracket has a complicated shape, dust such as paper flour or powder accumulated on the upper surface of the bracket cannot be removed easily, so that there is also a problem that the cleaning operation of the fan device cannot be carried out easily.
Furthermore, since the bracket to which the blast fan is attached is firmly fixed to the suspending bar via, for example, a fastening member such as a bolt & nut, there arises a problem that the blast fan cannot be shifted easily and quickly to desired positions according to the size or the material of the sheet to be printed, so that it requires long time for an adjustment work.
In view of such problems, it is an object of the present invention to provide a sheet-discharging apparatus for a sheet-fed printing press in which a fan device is downsized, the visibility of the operator is improved, the cleaning operation of the fan device is carried out easily, and the blast fan may be shifted easily and quickly to a desired position according to the size or the material of the sheet to be printed.
In order to solve the above-described problems, the present invention employs following means.
A sheet-discharging apparatus for a sheet-fed printing press according to the present invention includes a fan device having a plurality of blast fans provided above a sheet-stacking position where sheet fed from a printing apparatus are stacked for providing a downward flow and a frame for mounting the blast fans, in which at least some of the plurality of blast fans are arranged in contact with the lower surface of a frame body corresponding to elongated openings formed on the thin-plate shaped frame body which constitutes the frame, and are slidable in the feeding direction and/or in the widthwise direction with respect to the frame body.
According to the sheet-discharging apparatus for a sheet-fed printing press as described above, for example, the blast fans are directly attached to the frame body so that the upper surfaces of flange portions formed into an annular (doughnut) shape at upper ends of the blast fans and the lower surface of the frame body come into abutment with each other, the dimension of the fan device in the height direction may be reduced to the substantially same dimension as the thickness of the blast fan, so that the fan device is downsized, and the visible range of the operator (personnel) of the sheet-discharging device may be widened, thereby improving the visibility.
Since the upper surface of the frame body may be formed into a shape having less concavo-convex, which facilitates cleaning, dust such as paper flour or powder accumulated on the upper surface of the frame body may be removed easily, and hence the cleaning work of the fan device may be simplified, whereby the working time required for the cleaning operation may be reduced.
In addition, since the structure of the fan device is simplified (that is, the fan device includes the blast fans and the frame as main elements), the number of components is reduced, and the manufacturing cost is also reduced.
Furthermore, the blast fans arranged corresponding to the elongated openings are configured to be slidable in the feeding direction and/or in the widthwise direction, the blast fans may be shifted easily and quickly to desired positions according to the size or the material of the sheet to be printed, so that an optimal flow suitable for the size or the material of the sheet is applied to the sheet.
In the sheet-discharging apparatus for a sheet-fed printing press described above, preferably, partitioning panels formed into an endless ring are provided so as to project upward from the upper surface of the frame body along the peripheries of the openings.
According to the sheet-discharging apparatus for a sheet-fed printing press as described above, the dust such as paper flour or powder accumulated on the upper surface of the frame body is prevented from dropping downward (that is, toward the sheets stacked on the paper discharge table) through the openings by the outer peripheral surfaces (radially outer surfaces) of the partitioning panels, and hence the upper surface of the sheets stacked on the sheet-discharging table may be maintained in a clean state, and the sheets are prevented from becoming damaged, and hence the quality of the printed materials is improved.
In the sheet-discharging apparatus for a sheet-fed printing press, preferably, a shifting mechanism which shifts the plurality of blast fans which are slidable in the feeding direction and/or the widthwise direction automatically with respect to the frame body is provided.
In the sheet-discharging apparatus for a sheet-fed printing press as described above, since the blast fans arranged corresponding to the elongated openings may be slid automatically in the feeding direction and/or the widthwise direction, automation of the apparatus is achieved, and the blast fans may be shifted easily and quickly to the optimal positions according to the size or the material of the sheet to be printed.
The sheet-fed printing press in the present invention includes the sheet-discharging apparatus for a sheet-fed printing press as described above.
According to the sheet-fed printing press, since the sheet-discharging apparatus for a sheet-fed printing press in which the fan device is downsized and visibility of the operator (personnel) of the sheet-discharging device is improved is provided, the entire sheet-fed printing press is downsized, and the safety of the operator is also improved.
Furthermore, since the sheet-discharging apparatus for a sheet-fed printing press in which the cleaning operation of the fan device is simplified and the working time required for the cleaning operation is reduced, the maintenance and inspection work is facilitated so that time and cost required for the maintenance and inspection work are reduced.
Furthermore, since the sheet-discharging apparatus for a sheet-fed printing press in which the structure of the fan device is simplified, the number of components is reduced and the manufacturing cost is reduced is provided, the manufacturing cost of the entire sheet-fed printing press is reduced.
Furthermore, since the sheet-discharging apparatus for a sheet-fed printing press in which the blast fans arranged corresponding to the elongated openings may be shifted easily and quickly to desired positions according to the size or the material of the sheet to be printed to provide the sheet with an optimal flow suitable for the size or the material of the sheet is provided, the sheet is prevented from becoming damaged and hence the quality of the printing materials is improved.
According to the present invention, there are effects that the fan device is downsized, the visibility of the operator is improved, the cleaning operation of the fan device is facilitated, and the blast fans may be shifted easily and quickly to desired positions according to the size or the material of the sheet to be printed.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic block diagram of a principal portion of a sheet-fed printing press provided with a sheet-discharging apparatus for a sheet-fed printing press according to a first embodiment of the present invention.

FIG. 2A is a general perspective view of a fan device shown in FIG. 1.

FIG. 2B is a front view of the fan device shown in FIG. 2A when viewed from the lower left side of the drawing.

FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2A.

FIG. 4 is a general perspective view of the fan device shown in FIG. 1.

FIG. 5 is a general perspective view of the fan device of the sheet-discharging apparatus for a sheet-fed printing press according to a second embodiment of the present invention.

FIG. 6 is a general perspective view of the fan device in the sheet-discharging apparatus for a sheet-fed printing press according to a third embodiment of the present invention.

FIG. 7A is a perspective view of a principal portion of the fan device in the sheet-discharging apparatus for a sheet-fed printing press according to a fourth embodiment of the present invention.

FIG. 7B is a cross-sectional view taken along the line VII-VII in FIG. 7A.

FIG. 8A is a drawing similar to FIG. 7B, showing the fan device of the sheet-discharging apparatus for a sheet-fed printing press according to another embodiment of the present invention.

FIG. 8B is a drawing similar to FIG. 7B showing the fan device of the sheet-discharging apparatus for a sheet-fed printing press according to still another embodiment of the present invention.

FIG. 8C is a drawing similar to FIG. 7B showing the fan device of the sheet-discharging apparatus for a sheet-fed printing press according to still another embodiment of the present invention.

FIG. 9 is a drawing similar to FIG. 3, showing the fan device of the sheet-discharging apparatus for a sheet-fed printing press according to a fifth embodiment of the present invention.

FIG. 10A is a schematic block diagram of a shifting mechanism showing the fan device of the sheet-discharging apparatus for a sheet-fed printing press according to the fifth embodiment of the present invention.

FIG. 10B is a schematic block diagram of the shifting mechanism showing the fan device of the sheet-discharging apparatus for a sheet-fed printing press according to the fifth embodiment of the present invention.

EXPLANATION OF REFERENCE

4: sheet
5: endless chain
7: chain gripper
11: fan device
20: sheet-discharging apparatus for a sheet-fed printing press
21: blast fan
22: frame
23: frame body
25: first opening
30: third opening
31: fan device
40: fourth opening
41: fan device
50: partitioning panel
51: fan device
60: shifting mechanism
61: fan device
100: sheet-fed printing press

BEST MODE FOR CARRYING OUT THE INVENTION

Referring now to FIG. 1 to FIG. 4, a first embodiment of a sheet-discharging apparatus for a sheet-fed printing press according to the present invention will be described.
FIG. 1 is a general schematic block diagram of a sheet-fed printing press 100 provided with a sheet-discharging apparatus 20 for a sheet-fed printing press (hereinafter, referred to simply as “sheet-discharging device”), FIG. 2A and FIG. 4 are general perspective views of a fan device 11 shown in FIG. 1, FIG. 2B is a front view of the fan device 11 shown in FIG. 2A viewed from the lower left side of the drawing, and FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2A.
As shown in FIG. 1, the sheet-fed printing press 100 includes a sheet-feeding device (not shown), a printing apparatus 16 and the sheet-discharging apparatus 20.
The sheet-feeding device is a unit configured to allow sheets (for example, printing sheets) 4 as printed material to be stacked on a sheet-feeding table (not shown), and feed the sheet 4 one by one from the top in sequence to the printing apparatus 16 in the next process.
The printing apparatus 16 generally includes a plurality of sets of printing apparatuses 16 for different colors of ink arranged in a line and is a unit for carrying out a predetermined printing job on the sheets 4 fed continuously from the sheet-feeding device.
In FIG. 1, a reference sign P designates a printing plate cylinder to which ink is supplied from an ink supply system (not shown), a reference numeral 1 designates a blanket cylinder to which ink is transferred from the printing plate cylinder, and a reference numeral 2 designates a pressure cylinder.
The sheet-discharging apparatus 20 includes an endless chain 5 having a chain gripper 7 for gripping a sheet 4 as transfer means for transferring the printed sheet 4, a sheet-discharging table 13 suspended by a chain (not shown) to provide a place to stack the sheets 4, the fan device 11 arranged above the sheet-discharging table 13, a vacuum wheel 12 which functions to damp the traveling velocity of the sheet 4 which drops from the chain gripper 7 for supply, and a powder spray nozzle 14 arranged in the vicinity of a sheet-discharging cylinder 3 on the downstream side as main elements.
In FIG. 1, a reference numeral 6 designates a chain guide, a reference numeral 8 designates a stopper and a reference numeral 10 designates a sheet guide.
The powder spray nozzle 14 is adapted to inject powder (flour) to a printing surface of the sheet 4, whereby adhesion between the back side of the sheet 4 and the printed ink is prevented.
As shown in FIG. 2A and FIG. 2B, the fan device 11 includes a plurality (twenty in this embodiment) of blast fans 21 and a frame 22 for attaching these blast fans 21, and forms a downward air flow above the position to stack the sheets.
The frame 22 includes a frame body 23 having a rectangular shape in plan view and slide rails 24 (see FIG. 3) for slidably supporting the plurality of (ten in this embodiment) blast fans 21 positioned on the upstream side (right side in FIG. 1).
A plurality of (five in this embodiment) first openings 25 are formed on the upstream side of the frame body 23 and a plurality of (ten in this embodiment) second openings 26 are provided on the downstream side of the frame body 23.
The first openings 25 are each formed into a hole elongated in the feeding direction. The plurality of first openings 25 are arranged in the widthwise direction (the direction orthogonal to the feeding direction).
The second openings 26 are each formed into a round hole. The plurality of second openings 26 are arranged in a plurality of rows (five rows in this embodiment) along the feeding direction and at least one row (two rows in this embodiment) along the widthwise direction.
As shown in FIG. 3, the slide rails 24 (ten in this embodiment), being plate-shaped members each assuming a substantially S-shape in cross-section, are provided on the lower surface of the frame body 23 so as to suspend and support a flange portion 21 a of the blast fan 21 positioned on the upstream side, and be capable of sliding the blast fan 21 positioned on the upstream side with respect to the first openings 25.
On the other hand, the blast fans 21 positioned on the downstream side are arranged vertically below the corresponding second openings 26, and flange portions 21 a and the frame body 23 are connected via fastening member (for example, a bolt & nut).
In FIG. 2B and FIG. 3, a reference numeral 27 designates a cable for supplying power source (power) to the blast fan 21.
Under such configuration, sheets 4 after a predetermined printing job are handed from the pressure cylinder 2 to a portion of the sheet-discharging cylinder 3 (the side of the sheet-discharging apparatus 20). In other words, the sheets 4 are handed to the chain gripper 7 of the endless chain 5 which travels while being wound around the sheet-discharging cylinder 3, are transferred to the downstream side by the sheet-discharging apparatus 20 in a stat in which the front end thereof is gripped by the chain gripper 7, and are stacked on the sheet-discharging table 13 in sequence by a downward flow coming from the blast fans 21 of the fan device 11.
Then, when the predetermined number of sheets 4 are stacked, the partitioning panel is inserted into the sheet inserting portion, and allows trailing sheets 4 to be stacked on the sheet partitioning panel. At the same time, the sheet-discharging table 13 is lowered, where the stacked sheets 4 are carried out to the outside together with a lowermost palette (blanking panel) using a forklift or the like at the lowermost position. Then, a new palette is placed on the vacant sheet-discharging table 13 and is shifted upward again to an initial position. Then, the sheets 4 which are temporarily supported by the partitioning panel are received, and the operation of the sheet stacking apparatus is started again. By repeating the same operation, the printing job is carried out continuously.
With the sheet-discharging apparatus 20 in this embodiment, since the blast fans 21 are directly attached to the frame body 23 so that the upper surfaces of the flange portions 21 a formed into an annular (doughnut) shape at upper ends of the blast fans 21 and the lower surface of the frame body 23 come into abutment with each other, the dimension of the fan device 11 in the height direction may be reduced to the substantially same dimension as the thickness of the blast fan 21, so that the fan device 11 is downsized, and the visible range of the operator (personnel) of the sheet-discharging device 20 may be widened, thereby improving the visibility.
Since the upper surface of the frame body 23 may be formed into a shape having less concavo-convex, which facilitates cleaning, dust such as paper flour or powder accumulated on the upper surface of the frame body 23 may be removed easily, and hence the cleaning work of the fan device 11 may be simplified, whereby the working time required for the cleaning operation may be reduced.
In addition, since the structure of the fan device 11 is simplified (that is, the fan device 11 includes the blast fans 21 and the frame 22 as main elements), the number of components is reduced, and the manufacturing cost is also reduced.
Furthermore, since the blast fans 21 positioned on the upstream side (the blast fans 21 arranged corresponding to the first openings 25) are configured to be slidable in the feeding direction, for example, as shown in FIG. 4, the blast fans 21 positioned on the upstream side may be shifted easily and quickly to desired positions according to the size (in particular, the size in the feeding direction) or the material of the sheet 4 to be printed (see FIG. 1), so that an optimal flow suitable for the size (in particular, the size in the feeding direction) or the material of the sheet 4 is applied to the sheet 4.
Referring now to FIG. 5, a second embodiment of the sheet-discharging apparatus according to the present invention will be described.
The sheet-discharging apparatus in this embodiment is different from that in the first embodiment in that a fan device 31 including a plurality (five in this embodiment) of third openings 30 is provided instead of the fan device 11 having the second openings 26 and the second openings 26. Since other components are the same as those in the first embodiment, description of these components will be omitted here.
The third openings 30 are formed in an elongated shape so as to extend along the feeding direction from the upstream side to the downstream side of the frame body 23. The plurality of third openings 30 are arranged in line in the widthwise direction (the direction orthogonal to the feeding direction).
On the other hand, a plurality (ten in this embodiment) of the slide rails 24 (see FIG. 3) extending in the feeding direction along the both lateral sides of the third openings 30 are attached to the lower surface of the frame body 23.
According to the sheet-discharging apparatus in this embodiment, since all the blast fans 21 are slidable in the feeding direction with respect to the frame body 23, the blast fans 21 may be shifted easily and quickly to desired positions according to the size (in particular, the size in the feeding direction) or the material of the sheet 4 to be printed (see FIG. 1), so that an optimal flow suitable for the size (in particular, the size in the feeding direction) or the material of the sheet 4 is applied to the sheet 4.
Also, the ratio occupied by the third openings 30 with respect to the frame body 23 is increased in comparison with that in the first embodiment (that is, the plane on which dust such as paper flour or powder is accumulated is reduced in comparison with that in the first embodiment), and hence dust such as paper flour or powder accumulated on the upper surface of the frame body 23 is removed further easily. Therefore, the cleaning operation of the fan device 31 is carried out further simply, and hence the working time required for the cleaning operation is further reduced and the weight of the frame body 23 may be reduced.
Other effects and advantages are the same as in the first embodiment described above, description is omitted here.
Referring now to FIG. 6, a third embodiment of the sheet-discharging apparatus in the present invention will be described.
The sheet-discharging apparatus in this embodiment is different from that in the first embodiment described above in that a fan device 41 having the first openings 25 and a plurality of (two in this embodiment) fourth openings 40 is provided instead of the fan device 11 having the first openings 25 and the second openings 26. Since other components are the same as those in the first embodiment, description of these components will be omitted here.
Although only one each of the blast fan 21 is drawn in the fourth openings 40 in FIG. 6, it is just for simplification of the drawing and, in practice, there are provided a plurality of (four, for example) blast fans 21, in each of the fourth openings 40.
The fourth openings 40 are formed in an elongated shape so as to extend along the widthwise direction from one side to the other side of the frame body 23. The plurality of fourth openings 40 are arranged in line in the feeding direction.
On the other hand, a plurality (ten in this embodiment) of the slide rails 24 (see FIG. 3) extending in the widthwise direction along the both lateral sides of the fourth openings 40 are attached to the lower surface of the frame body 23.
According to the sheet-discharging apparatus in this embodiment, since the blast fans 21 positioned on the upstream side (the blast fans 21 arranged corresponding to the fourth openings 40) are slidable in the widthwise direction with respect to the frame body 23, the blast fans 21 may be shifted easily and quickly to desired positions according to the size (in particular, the size in the widthwise direction) or the material of the sheet 4 to be printed (see FIG. 1), so that an optimal flow suitable for the size (in particular, the size in the widthwise direction) or the material of the sheet 4 is applied to the sheet 4.
Other effects and advantages are the same as in the second embodiment described above, description is omitted here.
Referring now to FIG. 7A and FIG. 7B, a fourth embodiment of the sheet-discharging apparatus in the present invention will be described.
The sheet-discharging apparatus in this embodiment is different from those in the embodiments described above in that a fan device 51 having partitioning panels 50 along the peripheries of the first openings 25, the second openings 26, the third openings 30 and the fourth openings 40 is provided.
Other effects and advantages are the same as in the embodiments described above, description is omitted here.
FIG. 7A is a perspective view showing a principal portion of an example in which the partitioning panels 50 are applied to the peripheries of the third openings 30, and FIG. 7B is a cross-sectional view taken along the line VII-VII in FIG. 7A.
The partitioning panel 50 is a plate shaped member projecting vertically upward from the upper surface of the frame body 23 along the peripheries of the openings (the third openings 30 in this embodiment), and being formed into an endless (continuous) annular shape.
According to the sheet-discharging apparatus 20 in this embodiment, the dust such as paper flour or powder accumulated on the upper surface of the frame body 23 is prevented from dropping downward (that is, toward the sheets 4 stacked on the paper discharge table 13) through the openings by the outer peripheral surfaces (radially outer surfaces) of the partitioning panels, and hence the upper surface of the sheets 4 stacked on the sheet-discharging table 13 may be maintained in a clean state, and the sheets 4 are prevented from becoming damaged, and hence the quality of the printed materials is improved.
Other effects and advantages are the same as in the embodiments described above, description is omitted here.
The cross-sectional shape of the partitioning panel 50 is not limited to that shown in FIG. 7B and, for example, the cross-sectional shapes as shown in FIG. 8A to FIG. 8C may be employed.
The partitioning panel 50 may be formed by arranging a member manufactured separately from the frame body 23 along the periphery of the opening and joining the same, for example, by welding or the like, or may be formed integrally with the frame body 23, for example, by a press work when forming the opening.
Referring now to FIG. 9, FIG. 10A and FIG. 10B, a fifth embodiment of the sheet-discharging apparatus in the present invention will be described.
The sheet-discharging apparatus in this embodiment is different from that in the embodiments described above in that there is provided with a fan device 61 including a shifting mechanism 60 which shifts the blast fans 21 arranged corresponding to the first openings 25, the blast fans 21 arranged corresponding to the third openings 30, the blast fans 21 arranged corresponding to the fourth openings 40 automatically. Other effects and advantages are the same as in the embodiments described above, description is omitted here.
FIG. 9 is a similar drawing to FIG. 3, and FIG. 10A and FIG. 10B are schematic block diagrams of the shifting mechanism 60 showing an example of being applied to the flast fans 21 arranged corresponding to the third openings 30.
The shifting mechanism 60 includes a bearing 62 attached to the side surfaces of the blast fans 21 positioned on one end, base members 63 attached to the side surfaces of the blast fans 21 other than the blast fans 21 positioned on one end from among all the blast fans 21, a rod-shaped member 64 having a male screw portion 64 a formed on the outer surface thereof for engaging female screw portions 63 a formed in the interiors of the base members 63, and a electric motor M arranged at one end of the rod-shaped member 64 for providing a rotational force to the rod-shaped member 64.
Pitches of the female screw portions 63 a formed in the interiors of the base members 63 are formed so as to be 1:2:3 in ratio from the side of the blast fan 21 positioned at one end (that is, in a manner that when the rod-shaped member 64 is rotated by one turn in the direction of an arrow in FIG. 10A by the motor M, the blast fan 21 at a position closest to the blast fan 21 located at the one end shifts by a distance corresponding to one pitch of the male screw portion 64 a, the blast fan 21 at a position farthest from the blast fan 21 located at the one end sifts by a distance corresponding to three pitches of the male screw portion 64 a, and the blast fan 21 located in-between shifts by a distance corresponding to two pitches of the male screw portion 64 a, and in other words, in a manner that the distances of the respective blast fans 21 from the adjacent blast fan 21 are equalized). When the rod-shaped member 64 is rotated in the direction opposite from the direction indicated by the arrow in FIG. 10A by the motor M from the state shown in FIG. 10B, the distances between the adjacent blast fans 21 are decreased to restore the state shown in FIG. 10A.
According to the sheet-discharging apparatus 20 in this embodiment, since the blast fans 21 arranged corresponding to the elongated openings may be slid automatically in the feeding direction or in the widthwise direction, automation of the apparatus is achieved, and the blast fans 21 may be shifted easily and quickly to the optimal positions according to the size or the material of the sheet 4 (see FIG. 1) to be printed.
The present invention is not limited to those described in the embodiments shown above, and the embodiments described above may be combined as needed.
The pitches of the female screw portion 63 a formed in the interior of the base member 63 may be changed as needed.

Claims

1. A sheet-discharging apparatus for a sheet-fed printing press comprising: a fan device having a plurality of blast fans provided above a sheet-stacking position where sheet fed from the printing apparatus are stacked for providing a downward flow and a frame for mounting the blast fans, in which at least some of the plurality of blast fans are arranged in contact with the lower surface of a frame body corresponding to elongated openings formed on the thin-plate shaped frame body which constitutes the frame, and are slidable in the feeding direction and/or in the widthwise direction with respect to the frame body.

2. The sheet-discharging apparatus for a sheet-fed printing press according to claim 1, wherein partitioning panels formed into an endless ring are provided so as to project upward from the upper surface of the frame body along the peripheries of the openings.

3. The sheet-discharging apparatus for a sheet-fed printing press according to claim 1, wherein a shifting mechanism which shifts the plurality of blast fans which are slidable in the feeding direction and/or the widthwise direction automatically with respect to the frame body is provided.

4. A sheet-fed printing press comprising the sheet-discharging apparatus for a sheet-fed printing press according to claim 1.