JP3332684B2 - Discharge unit of sheet-fed printing press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum suction wheel provided in a paper discharge section of a sheet-fed printing press.

[0002]

2. Description of the Related Art FIGS.
This will be described below. FIG. 5A shows a schematic configuration of the entire sheet-fed printing press, and FIG. 5B shows a magnified view of a paper discharge unit indicated by a middle arrow P in FIG.

[0003] The sheet-fed printing press is mainly composed of a paper feeding device 17, a printing device 2, a paper discharging device 1, a stacking device 4, and the like. The sheets (sheets) 3 stacked on the table 18 of the sheet feeding device 17 are sequentially sent downstream one by one from the uppermost stage side, and then subjected to predetermined printing in the next process printing device 2. .

[0004] Subsequently, an endless chain 1 as a transfer device.
9 is conveyed to the sheet discharging device 1 via the chain gripper 20 provided in the stacking device 9, released from the chain gripper 20 onto the sheet discharging table 5 of the stacking device 4, and dropped and stacked.

[0005] A means for stably stacking the sheets 3 conveyed by the conveying means such as the endless chain 19 and the chain gripper 20 on the discharge table 5 of the sheet stacking device 4, that is, a sheet alignment. As means for ensuring this, a vacuum suction wheel 6 is provided above the entrance of the sheet stacking device 4. The vacuum suction wheel 6 can be moved in the front-back direction corresponding to the length of the sheet 3 to be printed.

In such a basic arrangement, a conventional typical vacuum suction wheel 6 has a plurality of sets arranged in a row in the width direction of the sheet 3, that is, in the direction perpendicular to the conveyance of the sheet 3, as shown in FIG. Each of the vacuum suction wheels 6 is connected to a vacuum pump 11 as an intake source via an independently provided opening / closing valve 21 and a suction pipe 22, so that operation and non-operation can be arbitrarily set. It has become.

An example of the on-off valve 22 provided in the vacuum suction wheel 6 is as shown in FIG. 7, and a vent hole 23 orthogonal to the axial direction in the air passage leading to the vacuum suction wheel 6.
An opening / closing valve 21 comprising a rotating shaft 24 is formed, and the air passage is opened and closed by rotating the rotating shaft 24 with a rotary actuator 25 driven via a motor or an electromagnetic valve. ing.

As another example, as shown in FIG. 8, an on-off valve comprising a sliding shaft 26 having a ventilation hole 23 formed in a direction perpendicular to the axial direction on the way to the air passage leading to the vacuum suction wheel 6. 2
The air passage is opened and closed by moving the slide shaft 26 in the left and right directions in the figure by an actuator 28 that operates via an electromagnetic valve 27.
In these figures, reference numeral 29 denotes an outer cylinder cell of the vacuum suction wheel 6;
Is an inner cylinder, 31 is a bracket, and 32 is a rotation shaft for integrally rotating the group of the outer cylinder cells 29.

With the above structure, when the vacuum pump 11 is driven, air is extracted from the open / close valve 21 which is opened, so that the hollow portion of the inner cylinder 30 becomes negative pressure and the long hole 33 formed in the upper surface and the outer hole 33 are formed. External air can be sucked in through a plurality of holes 34 formed in the peripheral surface of the cylindrical cell 29.

Sheet 3 rolled on the upper surface of the outer cylindrical cell 29
Is adsorbed by the intake air into the hole 34 formed in the outer peripheral surface of the outer cylinder cell 29, and then sent to the loading device 4 while the speed is braked by the outer cylinder cell 29 rotating at a low speed. Hereinafter, by repeating the same behavior, the sheets 3 are sequentially transferred and dropped onto the predetermined table 5.

In the case of wide paper (B in FIG. 6), all the vacuum suction wheels 6 are operated, and in the case of narrow paper (B _{0 in} FIG. 6), both widths are changed. The on-off valve at the end is closed, and only the vacuum suction wheels 6 at the three centers in FIG. 6 are operated. By these controls, the pressure loss of the vacuum pressure can be prevented, and the suction force can be properly and stably maintained.

FIGS. 9 and 10 show another example of a conventional sheet vacuum suction wheel. This device includes a suction roller 35, a plurality of sets of intake supply sections 36, a vacuum pump 11 not shown here but shown in FIG. 6, and a connection pipe connecting each intake supply section 36 to the vacuum pump 11. 3
7, a hose 38 and a shutoff valve 21 provided on the path of the hose 38.

As shown in FIG. 9, the suction roller 35 is formed by arranging a plurality of through-holes 39 passing through an axis to a solid shaft in a helical manner. It is formed in the opposite phase toward the end.

The intake supply section 36 has an intake port slidably contacting the outer peripheral surface of the suction roller 35, and a plurality of sets are divided along the axial direction of the suction roller 35. 4
Reference numeral 0 denotes a spring that presses the intake port against the outer peripheral surface of the suction roller 35.

When the vacuum pump 11 is driven and the shut-off valve 21 is opened under the above structure, the corresponding hose 38,
The connection pipe 37 and the inside of the suction supply section 36 become negative pressure, and the sheet 3 traveling on the upper surface can be sucked through the air suction from the through hole 39 of the suction roller 35.

The function of the shut-off valve 21 relating to the braking function on the paper 3 and the setting of the suction lateral width are the same as those in the examples described with reference to FIGS. This device has a structure in which through-holes 39 formed in the suction roller 35 are spirally arranged, and has a function of extending a wrinkle by obtaining a pulling force in the width direction together with a braking action on the paper 3.

[0017]

As described above, in the prior art, the conventional vacuum suction wheel 6 installed in the sheet discharging device is used for conveying the sheets (sheets) 3 in the width direction, that is, for conveying the sheets. On the other hand, a plurality of sets of vacuum suction means are provided in a line at right angles to each other, and each of the vacuum suction means corresponds to the width of the sheets 3 to be stacked by opening and closing an opening / closing valve (blocking valve) 21 independently provided. I was letting it. That is, in the case of a sheet 3 having a narrow width, the suction wheels 6 at both ends of the width, or the air supply section 3
The on / off valve 21 of No. 6 was closed, and control was performed so as to prevent leakage loss of vacuum pressure.

However, since the conventional vacuum suction wheel (means) 6 is divided into a plurality of units in the axial direction and installed, it is necessary to provide the open / close valve 21 for each of the divided units, so that the structure becomes complicated. , The failure increases. Also, maintenance and repair become difficult.

In addition, the structure of the vacuum suction unit becomes large, and a large installation space is required. Further, when the size of the paper to be printed is changed, it is necessary to adjust the position of the vacuum suction wheel 6 in the paper flow direction before printing. However, there are many hoses to be moved and the movement is difficult or the moving device becomes complicated. There were various problems.

An object of the present invention is to solve these problems and to obtain a new device that operates efficiently.

[0021]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a hollow suction pipe having a ventilation hole linearly disposed along the axial direction on the outer periphery thereof. A plurality of rows of ventilation holes arranged linearly along the axial direction are provided with a plurality of rows shifted in phase in the circumferential direction, and the lengths of the ventilation holes in each row are different from each other in the axial direction. A hollow valve loosely fitted to the outside of the suction tube, a valve rotation positioning means connected to the valve, and a plurality of spirals symmetrically arranged on the outer peripheral surface with respect to the axial center. And a discharge unit for a sheet-fed printing press, comprising a hollow suction shell having a plurality of holes and having a hollow suction shell loosely fitted to the outside of the valve in a direction in which the spiral strip advances from the center to both ends during normal rotation. Things.

Further, the present invention provides a paper discharge section vacuum suction wheel of a sheet-fed printing press, wherein the degree of change in the rotation direction of the hole area of the hollow suction shell in the axial direction is 50% or less. Is what you do.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS.

The overall configuration of the sheet-fed printing press is as follows.
Since the configuration is the same as that described in FIG. 5 and the configuration of each part is the same as or corresponds to the conventional one, there are some components that are the same or correspond. The repeated description of the parts having the same description will be omitted.

This embodiment is directed to a sheet discharging device 1 for a sheet-fed printing press.
The sheet vacuum for braking the traveling speed of the sheets (sheets) 3 sequentially conveyed from the pre-process printing apparatus 2 and stably stacking them on the table 5 of the stacking apparatus 4. As for the suction wheel 6, the basic function of sucking the lower surface of the sheet 3 and rotating the sheet at a low speed to reduce the traveling speed of the sheet and drop it into a predetermined position is the same as that described in the above-mentioned prior art. The same is true.

On the other hand, as shown in FIG. 1, the vacuum suction wheel 6 serving as the center is constructed by sequentially incorporating a hollow suction pipe 7, a valve 8 and a rotary suction shell 9 sequentially from the inside on the same axis.

The suction tube 7 located at the innermost side of the vacuum suction wheel 6 penetrates substantially the entire length as shown in a plane in FIG. 2A and a BB section in FIG. It has a hollow shaft, and both ends of the hollow portion are connected to a conduit 1 as shown in FIG.
0 is connected to the vacuum pump 11.

A plurality of long holes 12 serving as ventilation holes are formed in the outer peripheral portion of the suction tube 7, and are arranged linearly along the axial direction. In addition, although shown by a plurality of long holes 12, it can be replaced with one long hole or a plurality of round holes continuous over the arrangement position of the long holes 12.

In any case, both outermost ends in the axial direction of the ventilation holes such as the elongated holes 12 are formed slightly wider than the width of the largest sheet (sheet) to be printed. The suction tube 7 is fixed in a state where the long hole 12 is set in a direction for sucking the sheet.

Next, the valve 8 which is rotatably mounted to the outside of the suction pipe 7 with a small gap is shown in FIGS.
As shown in FIG. 2B, one or a plurality of ventilation holes 13 pierced linearly along the axial direction of the outer periphery of the hollow shaft are formed at a plurality of positions by changing the phase angle of the hollow shaft in the circumferential direction. 1 is provided with a rotation positioning means in which a lever 43 is fixed to an end of the shaft and connected to an air cylinder 41 by a link 42 as shown in FIG.

Next, as shown in FIG. 4, the rotary suction shell 9 fitted to the outside of the valve 8 has a plurality of rotation suction shells 9 in a specific area on the outer peripheral surface with the intention of reducing the intake capacity and maintaining the degree of vacuum. A plurality of holes 14 are formed, and the holes 14 are arranged substantially symmetrically with respect to the center in the axial direction and in a plurality of spirals.

The twisting direction of the spiral is determined by the rotation of the shell 9 and the running of the seat.
It is set so that the spiral strip advances sequentially from the center to both ends, and the suction force moves and acts in the same manner.

That is, suction is performed in advance from the hole 14 on the side closer to the axial center of the shell 19, and the suction force is delayed with respect to the rotation direction of the shell 9 toward the holes 14 on both ends. With this configuration, a function of extending wrinkles of the conveyed sheet 3 is obtained. In addition, the total variation of the area of the hole 14 formed in the shell in each area on the axial line is reduced by 50%.
% Or less.

That is, if the maximum value of the total sum of the hole opening areas on the axis is A ₁ and the minimum value of the total sum of the hole opening areas on the axis is A ₂ , the degree of area change = (A ₁ -A
₂ ) / A ₁ ≦ 0.5 (50%), and by setting this as small as possible, the fluctuation of the braking force (braking force) at the moment when the paper 3 separates from the suction area is reduced, so that the paper alignment is improved. The stacked state of the sheet (paper) 3 can be stabilized. It has been found that the above-mentioned area change degree is more desirable if it is set to about 20 to 30% in experiments. The rotary suction shell 9 is a motor 1 coupled to the shaft end.
5, and is driven to rotate.

According to the present embodiment, the hollow portion of the suction pipe 7 that has been made negative by the vacuum pump 11 is
External air is sucked through the elongated hole 12 on the upper surface, the vent 13 of the externally mounted valve 8, and the hole 14 of the rotary suction shell 9, and rolls and travels on the upper peripheral surface of the rotary suction shell 9 by the suction action. The sheet (sheet) 3 is adsorbed.

The valve 8 is selectively provided with a vent 13 having a suction width which is the most ideal with respect to the width of the sheet 3 printed via the rotating means, and the external rotary suction shell 9 is provided with a motor. The rotation of the sheet 15 is controlled such that the peripheral speed becomes much slower than the conveying speed of the sheet 3 by driving the sheet 15.

The valve 8 of the apparatus described above can block the suction hole 7 by cutting the suction hole 7 by setting the phase to a predetermined angle and cut the suction force. Stopper 16 at the downstream end for inspection of printing condition
And the sheet 3 can be appropriately extracted in the traveling direction.

In this embodiment, the basic structure of the vacuum suction wheel 6, namely, the vacuum suction tube 7, the valve 8 for setting the vacuum area (width) and the lower surface of the sheet (sheet) 3 are applied to reduce the braking force. The vacuum suction wheel 6 can be made very compact by incorporating the additional rotary suction shell 9 coaxially from the center of the shaft in order and coaxially, thereby making it possible to reduce the size of the entire paper discharge unit.

Regarding the components of the vacuum suction wheel 6, first, the suction pipe 7 sucks air from both ends of the shaft to suck the air in the pipe axis direction, that is, in the width direction of the running paper. The difference in force can be reduced, the skew of the sheet and the variation of the paper alignment can be eliminated, and the entire vacuum suction wheel 6 can be easily moved for adjustment in the traveling direction of the paper.

The valve 8 is a rotary positioning means composed of an air cylinder 41, a link 42, a lever 43, and the like. By setting a phase in the rotation direction of the shaft, a suction area (effective suction) in the width direction of the paper is set. Length) can be changed and set in a short time, and the number of parts (wear parts) such as conventional on-off valves is reduced, so that the durability is increased and the work time required for maintenance, repair and the like can be shortened.

Further, the suction shell 9 has a configuration in which the suction hole 14 is spirally arranged in a specific area and the suction action force is moved in both lateral width directions of the sheet with the rotation of the shell. Can be suppressed and wrinkles can be lengthened.

The degree of change in the total area of the holes 14 on the axial line is 50% or less (preferably 20 to 30).
%), The fluctuation of the braking force at the moment when the paper separates from the suction area is reduced, and the paper alignment is improved. Thus, the sheet stacking state in the sheet stacking device can be stably and accurately performed.

Although the present invention has been described with reference to the illustrated embodiments, the present invention is not limited to such embodiments.
It goes without saying that various changes may be made to the specific structure within the scope of the present invention.

[0044]

According to the present invention, various effects as listed below can be obtained.

(1) A valve for defining a suction area (width) around a vacuum suction pipe constituting a vacuum suction wheel, and a rotary suction shell for adsorbing a sheet (sheet) and applying a braking force are coaxially incorporated. The triple structure makes it possible to make the whole very compact. In addition, the paper flow direction of the vacuum suction wheel can be easily adjusted.

(2) By connecting both ends of the hollow portion of the vacuum suction tube to a vacuum source (vacuum pump), the degree of vacuum in the tube is made uniform, and the variation in the suction force in the sheet width direction (difference).
And the paper alignment becomes stable.

(3) As the structure of the valve, ventilation holes are formed in a straight line along the axial direction to set the effective suction length, and a plurality of types of ventilation holes having different effective suction lengths are formed in the circumferential direction. In this case, by changing the suction width corresponding to the sheet width by setting a plurality of valves and switching the valve to an appropriate phase. In addition, the valve of this type has less abrasion and accompanying failures as compared with the conventional on-off valve, and maintenance and adjustment (repair) are simplified.

(4) As the structure of the rotary suction shell, a plurality of holes are arranged symmetrically with respect to the center in the axial direction and in a plurality of spirals in a specific region of the outer peripheral surface. The twisting direction is set so that a suction force is applied to both ends of the shell sequentially from the center side in the sheet width direction, and in particular, in the invention of claim 2, the sum of the areas on the axis of the holes formed in the shell in each region By setting the fluctuation to 50% or less, the suction loss can be suppressed, the degree of vacuum can be ensured, and wrinkles on the sheet can be suppressed and the wrinkles can be increased by moving the suction action point outward in the width direction. In addition, it is possible to eliminate an extreme change in suction force due to the rotation of the suction shell, to reduce fluctuations in the braking force at the moment when the paper separates, and to improve the alignment of the paper, thereby achieving a stable stacking.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the present invention.

FIG. 2 shows the suction tube in the embodiment of FIG. 1, wherein a is its plane, and b is an explanatory view of a section BB of a.

3 shows the valve in the embodiment of FIG. 1, wherein a is its plane, b is a plane shifted by 90 ° from a, and c is a
FIG. 3 is an explanatory view taken along the line XX, and FIG.

FIG. 4 is an explanatory diagram of a shell in the embodiment of FIG. 1;

FIG. 5 is an explanatory diagram showing an entire ordinary sheet-fed printing press, wherein a is the entire configuration, and b is an enlarged view of a part P in the direction of arrow a.

FIG. 6 is an explanatory view showing an arrangement of a conventional vacuum suction wheel and a related configuration.

FIG. 7 is an explanatory view of a conventional on-off valve of a vacuum suction wheel.

FIG. 8 is an explanatory view of another on-off valve of a conventional vacuum suction wheel.

FIG. 9 is an explanatory view showing a roller of another conventional vacuum suction wheel.

FIG. 10 is an explanatory diagram showing the relationship between the roller in FIG. 9 and a suction structure.

[Explanation of symbols]

 6 Vacuum suction car 7 Suction tube 8 Valve 9 Suction shell 12 Vent hole 13 Vent hole 14 hole

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B65H 29/24 B41F 21/00 B65H 29/68

Claims (2)

(57) [Claims] 1. A hollow suction pipe having a ventilation hole linearly arranged along the axial direction on the outer periphery thereof, and a row of ventilation holes linearly arranged along the axial direction on the outer periphery thereof. A plurality of rows are provided with phases shifted in the circumferential direction, and the axial lengths of the ventilation holes provided in each row are different from each other, and the hollow valves are loosely fitted to the outside of the suction pipe, and are connected to the valves. The valve has a plurality of helically arranged holes symmetrically with respect to the center in the axial direction on the outer peripheral surface thereof and has a plurality of spirally arranged holes. A vacuum suction wheel for a paper discharge unit of a sheet-fed printing press, comprising a hollow suction shell loosely fitted in the direction outside the valve. 2. The discharge of a sheet-fed printing press according to claim 1, wherein the hole in the hollow suction shell has a degree of change in the rotation direction of the hole area on the axial line of 50% or less. Paper vacuum suction car.