JP6529305B2 - Sheet discharge device - Google Patents

Description

  The present invention relates to a sheet discharge device usable in a printing press, and relates to a sheet discharge device that drops and discharges sheets in a loadable state.

Conventionally, a sheet printed by a printing press is discharged in a state of being loaded on a loading platform. In order to load the sheet on the loading table, the sheet is released from the transport member above the loading table and dropped toward the loading table.
Examples of the conventional sheet discharge apparatus of this type include those described in Patent Document 1 and Patent Document 2. The sheet discharging apparatus disclosed in Patent Document 1 is configured to align and load the sheets without disturbing by utilizing an air blowing configuration in which air is blown onto the sheets from above.
The sheet discharging apparatus disclosed in Patent Document 2 aligns sheets by bringing a side-contacting plate into contact with both ends orthogonal to the sheet conveying direction.

Utility model registration 2503118 gazette Patent No. 2514822 gazette

However, the sheet is often charged with static electricity while being conveyed to the sheet discharge device, and even if the configuration described in Patent Document 1 or Patent Document 2 is used, the sheet is aligned due to the influence of static electricity. It was difficult to load on the loading platform. The effects of static electricity are particularly noticeable during the dry season, especially in the winter. If the sheets are not aligned on the loading table, there is a possibility that the processing can not be correctly performed in the post-process such as the punching process and the folding process after printing.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a sheet discharge apparatus capable of reliably aligning and stacking falling sheets.

In order to achieve this object, the sheet discharging apparatus according to the present invention includes a stacking unit on which the sheet is stacked, and a sheet which holds and conveys the sheet and releases the sheet held above the stacking unit. The member and the upper end portion of the loading unit reciprocate to contact and move away from the edge of the loaded sheet, and the sheet is arranged in a horizontal direction orthogonal to the sheet transport direction, And an air blowing device for discharging a part of the air toward the upstream side in the sheet conveying direction toward the falling space where the sheet released from the conveying member falls, a blowout port from which the air of the air blowing device blows out. is directed obliquely upward, the air blowing device includes a stacked sheets stacked on top of the loading unit by discharging the air between the falling sheets is released from the conveying member, the blow Air blown out from the mouth and is blown to the lower surface of the falling sheet is intended to reduce the falling speed of the drop sheet.

  In the sheet discharging apparatus according to the present invention, the air blowing apparatus may discharge ions.

In the sheet discharging apparatus according to the present invention, the apparatus may further include a fan which blows air down the sheet conveyance path toward the falling sheet.
In the sheet discharging apparatus according to the present invention, the air blowing device may be positioned in the vicinity of the side-to-side movement and upstream of the side-to-side movement in the transport direction.
In the sheet discharging apparatus according to the present invention, the blowout port of the air blowing device may be inclined to be directed to the downstream side in the transport direction.

In the present invention, the number of times the sheets are aligned in the side-by-side manner increases as compared to the conventional sheet discharge device by the decrease in the drop speed of the sheets. Therefore, even if the sheet is electrostatically charged, the sheet can be aligned without being disturbed.
Therefore, according to the present invention, it is possible to provide a sheet discharge apparatus capable of reliably aligning and stacking falling sheets.

It is a side view showing composition of a printing machine provided with a sheet discharge device concerning the present invention. FIG. 2 is a front view showing a configuration of a sheet discharge device. FIG. 2 is a plan view showing the configuration of a sheet discharge device. It is a block diagram which shows the structure of a control system.

Hereinafter, an embodiment of a sheet discharge apparatus according to the present invention will be described in detail with reference to FIGS.
The printing press 1 shown in FIG. 1 is a sheet-fed offset printing press, and sends a sheet 2 as a print medium from right to left in FIG. 1 and applies printing and coating to the sheet 2. The printing press 1 includes a sheet supply unit 3 for supplying a sheet 2, a printing unit 4 for printing on the sheet 2, a coating unit 5 for applying a coating on the sheet 2, and sheet discharge as a sheet discharge device according to the present invention. It has a part 6 and the like.

The sheet feeding unit 3 sucks a large number of sheets 2 stacked on the loading stand 3a one by one on a soccer device (not shown), and a feeder board for feeding the sheets 2 adsorbed by the soccer device to the printing unit 4 It has 7 and so on.
The printing unit 4 includes first to fourth printing units 11 to 14. Each of the first to fourth printing units 11 to 14 includes an impression cylinder 15, a blanket cylinder 16, a plate cylinder 17, an ink supply device 18, a water supply device 19 and the like.

  The impression cylinder 15 of the first to fourth printing units 11 to 14 includes a claw device (not shown) that holds the sheet 2 and has a function of feeding the sheet 2 to the downstream side in the transport direction. First to third transfer cylinders 21 to 23 are provided between the impression cylinders 15 of the first to fourth printing units 11 to 14. The first to third transfer cylinders 21 to 23 each have a claw device (not shown) for holding the sheet 2, and an impression cylinder located on the downstream side from the impression cylinder 15 located on the upstream side of the sheet 2 in the transport direction. Send to 15. The impression cylinder 15 of the fourth printing unit 14 sends the sheet 2 to a fourth transfer cylinder 25 located between the coating unit 5 and the impression cylinder 24 described later. The fourth transfer cylinder 25 has the same configuration as the first to third transfer cylinders 21-23.

  The coating unit 5 includes an impression cylinder 24 to which the sheet 2 is fed from the fourth transfer cylinder 25, a coater cylinder 26 in contact with the impression cylinder 24, and a coating liquid supply device (see FIG. (Not shown) etc.

  The sheet discharging unit 6 includes a conveying unit 31 that conveys the sheet 2 from the coating unit 5 and a stacking unit 33 having a stacking table 32 on which the sheet 2 is stacked. The transport unit 31 transports the sheet 2 to the upper side of the loading stand 32 by the delivery chain 34 and the many claws 35. As shown in FIG. 2, the delivery chain 34 is provided in a pair in a horizontal direction (left and right direction in FIG. 2) orthogonal to the transport direction (direction orthogonal to the sheet of FIG. 2).

  The claw rod 35 is provided on the delivery chain 34 so as to be bridged between the pair of delivery chains 34 and 34 and arranged at predetermined intervals in the transport direction. The claw rod 35 is provided with a plurality of gripper mechanisms 36 that hold the front end of the sheet 2 in the transport direction. In this embodiment, the claw bar 35 corresponds to the "conveying member" in the present invention. The nail bar 35 holds and conveys the sheet 2 and releases the sheet 2 held above the stacking unit 33.

  The sheet 2 released from the claws 35 falls in the sheet drop space S formed between the conveyance unit 31 and the stacking unit 33 and is stacked on the lower stacking table 32. Hereinafter, the sheet 2 in the process of falling through the sheet falling space S is simply referred to as a falling sheet 2A (see FIG. 2). In FIG. 2, a plurality of falling sheets 2A are illustrated. Among the falling sheets 2A, the falling sheet 2A located at the upper side is the next to the claw line 35 located on the upstream side in the transport direction after the falling sheet 2A located at the lower side is released from the nail 35. It was released from That is, the plurality of falling sheets 2A fall into the sheet falling space S, respectively.

Also, in the following, the large number of sheets 2 stacked on the stacking table 32 will be simply referred to as a stacking sheet 2B. The sheet discharging unit 6 forms a sheet pile 37 composed of the loading table 32 and the stacking sheet 2B, and discharges the sheet 2 after printing as the sheet pile 37.
As shown in FIG. 2, a delivery fan device 41 is provided above the sheet drop space S and between the pair of delivery chains 34. As shown in FIG. 3, this delivery fan device 41 is constituted by a plurality of fans 41a.

  The plurality of fans 41a are arranged at predetermined intervals in the conveyance direction (vertical direction in FIG. 3) of the sheet 2 and in the horizontal direction (horizontal direction in FIG. 3) orthogonal to the conveyance direction. There is. Hereinafter, the horizontal direction orthogonal to the conveyance direction of the sheet 2 is simply referred to as the left-right direction. These fans 41a blow air 42 (see FIG. 2) from above the conveyance path of the sheet 2 toward the falling sheet 2A released from the nail 35. The operation of these fans 41a is controlled by a control device 43 (see FIG. 4) described later. In this embodiment, these fans 41a correspond to the "fans" described in claim 4.

  As shown in FIG. 3, a plurality of front pads 44 are provided on the front side (downstream side in the transport direction) of the sheet drop space S. The front pad 44 is for stopping the falling sheet 2A which is advanced by inertia after being released from the nail 35. On the rear side (upstream side in the transport direction) of the sheet drop space S, a suction wheel 45 and a charge removal bar 46 are provided. The suction wheel 45 sucks the rear of the falling sheet 2A released from the nail 35 to reduce the advancing speed of the falling sheet 2A. The charge removal bar 46 is positioned upstream of the suction wheel 45 in the transport direction, and removes static electricity on the lower surface of the falling sheet 2A by contacting the lower surface of the falling sheet 2A.

  Sideways 47 are provided at the bottom of the sheet drop space S, that is, at the upper end of the stacker 33 and on both sides in the left-right direction. As shown in FIG. 2 and FIG. 3, these side-shifters 47 are formed in a plate shape extending in the conveyance direction of the sheet 2 and in the vertical direction, and the downstream end in the conveyance direction of the sheet 2 as viewed from above It is located in the department. The sideways displacements 47 reciprocate in the left and right direction at predetermined intervals, and contact and separate from the left and right direction edge of the falling sheet 2A loaded on the loading unit 33. The falling sheets 2 </ b> A are brought close to the center in the sheet falling space S in the left-right direction by hitting the side-to-side alignment 47. The falling sheet 2A shown in FIG. 2 is drawn in a distorted state in which the central portion is convex upward due to the static electricity that has been charged.

  An air blowing device 51 is disposed in the vicinity of the side-by-side 47. As shown in FIG. 2, the air blowing device 51 is disposed at a position at which the distance from the sheet drop space S is longer in the left-right direction as compared to the side-by-side 47 and slightly below the side-by-side 47 . Further, as shown in FIG. 3, the air blowing device 51 is positioned on the upstream side in the transport direction with respect to the side slip 47. As shown in FIG. 2, the air blowing device 51 according to this embodiment has the air 52 between the stacking sheet 2 B stacked on the top of the stacking unit 33 and the falling sheet 2 A released from the nail 35. Discharge. The air outlet 51a from which the air 52 of the air blowing device 51 blows is directed obliquely upward. Here, the obliquely upward direction is a direction in which the air 52 blown from the blowout port 51a is blown to the lower surface of the falling sheet 2A. Note that all the air 52 blown out from the blowout port 51a does not hit the lower surface of the falling sheet 2A, and a part of the air 52 blown out from the blowout port 51a is above the falling sheet 2A or the falling sheet 2A and the stacking sheet 2B. Sent between.

As the air 52 is blown to the lower surface of the falling sheet 2A, a buoyancy is given to the falling sheet 2A. For this reason, the falling speed of the falling sheet 2A is reduced as compared with the state where the air 52 is not blown. That is, the air blowing device 51 supplies the air 52 between the stacking sheet 2B and the falling sheet 2A to reduce the falling speed of the falling sheet 2A.
Further, as shown in FIG. 3, the blowout port 51 a is inclined in a state of being slightly directed to the downstream side in the transport direction as viewed from above. For this reason, the air 52 is relatively largely discharged to the downstream side in the transport direction, and is discharged to the downstream side in the transport direction of the sheet 2 from the sheet drop space S.

  The air blowing device 51 according to this embodiment has a function of releasing the ions 53 (see FIG. 2) together with the air 52. The ions 53 are carried by the air 52 and sent to the falling sheet 2A and the stacking sheet 2B. The blowout amount of the air 52 blown out from the air blowing device 51 and the generation amount of the ions 53 are controlled by a control device 43 described later. In the following, the air 52 containing the ions 53 is referred to as air 52 for static elimination in order to distinguish it from the air 42 blown down by the delivery fan device 41.

As shown in FIG. 4, the control device 43 has a plurality of functional units, and the above-described delivery fan device 41, the air blowing device 51, and the input device 54 are connected. The input device 54 is for the operator to input various data described later.
The functional units of the control device 43 are a sheet information identification unit 55, an ion generation amount control unit 56, and a fan control unit 57.

  The sheet information identification unit 55 according to this embodiment identifies the individual data of the sheet 2 that affects the drop speed of the sheet 2. The individual data includes, for example, the weight of the sheet 2, the material of the sheet 2, the presence or absence of electrostatic charge, the electrostatic charge position, and the irregular shape of the sheet 2. There are two ways to specify the weight of the sheet 2 as individual data. The first method is a method using the weight input by the operator using the input device 54. The second method is a method of obtaining the weight by calculation using the material of the sheet 2 input to the input device 54 by the operator, the size and thickness of the sheet 2 and the like. This calculation is performed by the sheet information identification unit 55. In addition, in order to specify the weight of the sheet | seat 2, as shown with a dashed-two dotted line in FIG. 4, the detection part 58 can be provided in the control apparatus 43 instead of the input device 54, and it can carry out. The detection unit 58 has a function of reading out the material, size, thickness and the like of the sheet 2 from the current print data of the printing press 1 and transmitting these data to the sheet information identification unit 55.

  The data input by the operator to the input device 54 can be used as other individual data, that is, data such as the material of the sheet 2, the presence or absence of electrostatic charge, the electrostatic charge position, and the irregular shape of the sheet 2. . Since the sheet 2 made of a material that is likely to be electrostatically charged and the sheet 2 that is electrostatically charged are highly likely to be absorbed by the other sheet 2 or to be repelled by the other sheet 2, sufficient charge removal by the ions 53 is sufficient. You need to do it.

  The sheet 2 conveyed in the printing press 1 is affected by the ambient temperature and humidity. For this reason, the moisture content contained in the sheet 2 is not necessarily uniform over the entire surface of the sheet 2. As described above, when the water content of the sheet 2 becomes uneven, the sheet 2 has a portion with a large amount of electrostatic charge and a portion with a small amount of electrostatic charge. Such a sheet 2 may not be in the horizontal state when dropped due to the influence of static electricity.

The sheet 2 may be bent, for example, in a wavy shape during the storage period before being supplied to the sheet supply unit 3 and may be difficult to return. There is a high possibility that the posture of the sheet 2 having a so-called "squeezed" abnormal shape as described above is not horizontal when dropped.
Although details will be described later, the fan control unit 57 of the control device 43 individually controls the air blowing amount of the air blowing device 51 on both the left and right sides based on such individual data of the sheet 2.

The ion generation amount control unit 56 of the control device 43 controls the function of switching between the state in which the air blowing device 51 releases the ions 53 and the state in which the ions 53 are not released, and the amount of the released ions 53. It has a function.
The fan control unit 57 has two functions. The first function is to switch on and off the fan 41 a of the delivery fan device 41.

  The second function is a function of controlling the air blowing amount of the air blowing device 51 based on the individual data of the sheet 2 specified by the sheet information specifying unit 55. By controlling the blowout amount, the amount by which the falling sheet 2A blows up by the static elimination air 52 can be adjusted to a blowout amount with high efficiency, and the time until the drop of the falling sheet 2A ends is a drop time with high efficiency. Can be adjusted. That is, the falling speed of the falling sheet 2A can be adjusted to an optimum speed.

When the weight of the sheet 2 is specified as the individual data of the sheet 2 in the sheet information specifying unit 55 described above, the fan control unit 57 changes the blowing amount of the static elimination air 52 in proportion to the weight of the sheet 2.
If the material of the sheet 2 specified as the individual data is a material that easily charges static electricity, or if it is specified that the sheet 2 is charged electrostatically, the fan control unit 57 detects the static electricity of the air 52 for static elimination. Increase the blowout volume.

When the electrostatic charge position is specified as the individual data, the fan control unit 57 increases the blowout amount of the air blowing device 51 close to the charge position having a large charge amount and the generation amount of the ions 53.
When a shape that is not normal is identified as individual data, the fan control unit 57 sets the amount of air blown from the air blowing device 51 on the left side and the air blowing device on the right side with the goal of a state in which the posture of the falling sheet 2 becomes horizontal. Control the blowout amount of 51 individually.

  In the printing press 1 configured as described above, the sheet 2 subjected to printing is conveyed above the loading unit 33 by the delivery chain 34 and the claw rod 35. The operation of the delivery fan device 41 and the air blowing device 51 of the sheet discharge unit 6 is controlled by the control device 43 at the time of printing, and both devices are in the operating state. That is, the air 42 is blown down from the delivery fan device 41, and the charge removal air 52 is blown out from the air blowing device 51 by an amount based on the individual data of the sheet 2.

  The sheet 2 conveyed to the upper side of the stacking unit 33 is released from the nail 35 and falls in the sheet dropping space S. The falling sheet 2A is restricted in the downward direction by the falling sheet 2A being pushed by the air 42 blown down from the delivery fan device 41. On the other hand, the static elimination air 52 is blown obliquely from below to the lower surface of the falling sheet 2A. For this reason, since buoyancy is provided to the falling sheet 2A by the static elimination air 52, the falling speed of the falling sheet 2A is reduced. That is, the falling sheet 2A falls downward at a low speed as compared with the case where the static elimination air 52 is not blown.

  The air 52 for static elimination contains ions 53. Therefore, even if the falling sheet 2A is charged by static electricity, the static electricity is neutralized by the ions 53 and sufficiently removed when the sheet is falling at a low speed in the sheet falling space S. When a large number of sheets 2 are stacked on the stacking table 32, ions 53 are always sent also to the topmost stacked sheet 2B, and static electricity charged on the stacked sheets 2B is removed.

A lateral displacement 47 that reciprocates in the left-right direction is in contact with both end portions in the left-right direction of the falling sheet 2A falling in the sheet falling space S.
In the sheet discharge unit 6 according to this embodiment, the number of times the sheets 2 are aligned at the side-by-side 47 is increased by the reduction in the drop speed of the sheet 2 as compared with the conventional sheet discharge device. Therefore, even if the removal of static electricity by the ions 53 is not sufficient, the falling sheets 2A can be aligned without being disturbed by the sideways 47.
Therefore, the sheet discharge unit 6 according to this embodiment can reliably align and stack the falling sheets 2.

The air blowing device 51 according to this embodiment emits ions 53. For this reason, as described above, the ions 53 are sprayed on the falling sheet 2A being dropped and the loading sheet 2B loaded on the loading unit 33, and the static electricity charged on these sheets 2 is neutralized by the ions 53 and removed. can do.
That is, according to this embodiment, the falling sheet 2A from which static electricity has been sufficiently removed is stacked on the stacking sheet 2B from which static electricity has been sufficiently removed. Therefore, according to this embodiment, it is possible to prevent the stacking condition of the sheets 2 from being disturbed due to the repulsion due to the static electricity, or air stagnation (bubbles) being generated between the sheets 2 due to the adsorption due to the static electricity to disturb the stacking condition. be able to.

  When the sheets 2 are loaded in a state where an air pool is generated between the sheets 2, the loaded sheet 2B is distorted such that the portion corresponding to the air pool is convex upward. In such a state, there is a possibility that the side slip 47 will not hit, and it becomes difficult to align the sheets 2. However, in the sheet discharge unit 6 according to this embodiment, since the ions 53 are also supplied to the stack sheet 2B and static electricity of the stack sheet 2B can be eliminated, the air pool is eliminated, and the stack sheet 2B is correctly corrected by the side alignment 47 It becomes possible to align.

The blowout port 51a of the air blowing device 51 according to this embodiment is directed obliquely upward, and the static elimination air 52 blown out from the blowout port 51a is blown to the lower surface of the falling sheet 2A. For this reason, buoyancy is provided to the falling sheet 2A by the static elimination air 52, and the falling speed is reduced.
Therefore, according to this embodiment, since the drop speed of the sheet 2 can be easily changed, the sheet discharge apparatus in which the drop speed is reduced can be realized with a simple structure.

  The sheet discharging unit 6 according to this embodiment includes a fan 41a that blows air 42 down from above the conveyance path of the sheet 2 toward the falling sheet 2A released from the nail 35 (conveying member). For this reason, according to this embodiment, the dropping direction of the falling sheet 2A can be regulated although the destaticizing air 52 is supplied below the falling sheet 2A, and the falling sheet 2A is directed downward. It can be made to fall towards you. Therefore, according to this embodiment, it is possible to provide a sheet discharge device which can more easily align the sheets 2.

  The printing press 1 according to this embodiment includes a control device 43 that controls the amount of air blown out of the air blowing device 51 based on the individual data of the sheet 2. Therefore, since the static elimination air 52 can be sprayed on the lower surface of the falling sheet 2A with the blowing amount suitable for the weight of the sheet 2, the state when the sheet 2 is dropped, etc., the falling speed of the sheet 2 is always optimal. It is possible to reduce to speed.

  When the sheet 2 is thin paper, it is easily attracted by static electricity when the falling sheet 2A is falling. According to the sheet discharge unit 6, immediately after such a falling sheet 2A starts to fall, the air for static elimination 52 can give buoyancy to the falling sheet 2A, and the ions 53 are added to the falling sheet 2A and the other It can be filled up with the falling sheet 2A. For this reason, since it is possible to take a long time for the falling sheet 2A made of thin paper to be dropped, static electricity is sufficiently removed, and a large amount of the side slip 47 will be hit. It is easy to guide and align at the same position. Further, since ions 53 are sufficiently supplied to the falling sheet 2A, static electricity can be prevented from remaining inside the falling sheet 2A.

  When the sheet 2 is a thick sheet, the rigidity of the falling sheet 2A is relatively high, so that with some static electricity, the force induced by the side-by-side 47 is greater than the adsorption force of the falling sheets 2A. Such a falling sheet 2A can be aligned by the side-by-side 47 even in a state where it is electrostatically attracted to the other falling sheets 2a. Therefore, by discharging the sheet 2 of this type by the sheet discharging portion 6 according to this embodiment, the static electricity remaining inside the sheet 2 is sufficiently removed, and the effect of facilitating processing in the later step is obtained. .

  When the sheet 2 is a film or special material, the sheet 2 of this type is conveyed to the sheet discharge unit 6 in a state where the static level is high. Even if the rigidity is high, the falling sheet 2A having a high electrostatic level can not be guided to the proper position by the side alignment 47, and becomes uneven on the loading base 32. However, as in the case of thin paper, even with this type of falling sheet 2A, the falling speed is lowered to perform sufficient charge removal and the number of times the cross-over 47 hits to increase the cross-over 47 even if the static level is high. It is possible to align. Then, by continuously supplying the ions 53 in a state where the sheet 2 of this type is stacked as the sheet pile 37, it is possible to gradually reduce the level of static electricity that stagnates.

  The sheet discharge unit 6 according to this embodiment has a function of changing the amount of discharge of the air 52 for static elimination in proportion to the weight of the sheet 2 when the individual data of the sheet 2 is the weight of the sheet 2. Therefore, since the drop speed of the sheet 2 can be adjusted for each type of the sheet 2, it is possible to properly align any sheet 2 and to remove static electricity sufficiently.

  DESCRIPTION OF SYMBOLS 1 printing machine 2 sheet 2A falling sheet 2B loading sheet 6 sheet discharging unit (sheet discharging device) 33 loading unit 35 claw ring (conveying member) 41a fan 47 lateral 51, air blowing device, 51a, blowout port, 52, air for static elimination, 53, ion.

Claims (5)

A loading unit on which sheets are loaded;
A conveying member that holds and conveys a sheet, and releases the held sheet above the stacking unit;
Reciprocating at the upper end of the loading unit, and contacting and separating with the edge of the loaded sheet
An air blowing device is disposed to form a pair in a horizontal direction orthogonal to the sheet conveying direction, and discharges air toward a falling space where the sheet released from the conveying member falls.
The outlet from which the air of the air blowing device blows is directed obliquely upward,
The air blowing device discharges air between the stacking sheet stacked on the top of the stacking unit and the falling sheet released from the conveyance member, whereby the air blown out from the blowout port falls A sheet discharging apparatus characterized in that the sheet is sprayed on the lower surface of the sheet to reduce the falling speed of the falling sheet. In the sheet discharging apparatus according to claim 1,
The sheet discharging device according to claim 1, wherein the air blowing device discharges ions. In the sheet discharging apparatus according to claim 1 or 2 ,
And a fan for blowing air down from above the sheet conveyance path toward the falling sheet. In the sheet discharging apparatus according to claim 1,
The sheet ejection apparatus according to claim 1, wherein the air blowing device is positioned near the side-by-side movement and upstream of the side-by-side movement in the transport direction. In the sheet discharging apparatus according to claim 1 or 4,
The sheet discharging device according to claim 1, wherein the blowout port of the air blowing device is inclined in a state of pointing to the downstream side in the transport direction.

Images