JPH1077148A - Blow air device for paper discharge device arranged in work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve falling speed of sheet-fed paper to be taken down in a paper discharge device so that the sheet-fed paper having weight per different unit area can be satisfactorily taken down at a high processing speed to stacking paper. SOLUTION: Plural blowing pipes composed of plastic have comparatively small opening parts almost oriented to sheet-fed paper to be taken down, and are arranged so as to form first constitutive groups 20, 21 and 22 by being joined to each other, and a blow air device is formed of the plural constitutive groups 20, 21 and 22 extending to respective part surfaces, and the respective constitutive groups 20, 21 and 22 have a single joint part 17, and the joint part 17 is connected to a control unit having a compressed air supply part connected to the front end of the constitutive groups 20, 21 and 22 through a compressed air conduit 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blow air device for a paper ejection device provided in a processing machine, particularly a printing machine, and a blow-pipe arranged in a plane above a paper ejection pile. These blowing tubes assist the sheets being unloaded by the blown-out air, and the sheets are transported by a transport system having a gripper system and are unloaded to a delivery pile. Related to the type that is being adapted.

[0002]

2. Description of the Related Art A device of this type is known from DE 28 37 579 A1. Before the delivery pile in the sheet running direction,
In a known manner, suction rollers are arranged for braking the sheets to be unwound. Above the delivery pile, an adjustable and controllable lateral blast tube and a longitudinal blast tube overlap in a direction along the sheet running direction and in a direction perpendicular to the sheet running direction. Are located. These spray tubes have outlet openings directed at the sheet to be unwound. The sheet guided by the gripper clamping is loaded by a blow-air flow from above in a direction perpendicular to the sheet transport direction, and then starts at the center from the top along the sheet transport direction and moves outward. Loaded with blow air and wholesaled. In a further configuration, instead of the lateral and longitudinal blowing tubes, a blow case with a controllable cross-shaped nozzle row is arranged above the delivery pile.

[0003] Published German Patent Application No. 4213
The blow-air device known from U.S. Pat. No. 020 has a chamber, which is arranged above a delivery pile and consists of a solid or solid wall. Outlet openings for the air flow provided in this chamber are directed to the delivery pile corresponding to approximately the maximum sheet size. These outlet openings can be closed by covers for adjusting the strength or distribution of the air flow.

[0004] DE-A 34 13 A1
In the case of the adjustable blow-air device known from U.S. Pat. No. 179, individual blowing tubes are arranged above the delivery pile in combination with a blower in the longitudinal or transverse direction to the sheet running direction. Have been.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to ensure that sheets having different weights per unit area can be completely unloaded onto a stack at high processing speeds in a delivery device. The purpose is to improve the falling speed of the sheet.

[0006]

SUMMARY OF THE INVENTION In order to solve this problem, according to an embodiment of the invention, a plurality of spray tubes made of plastic are relatively oriented to the sheet to be unwound. It has a small opening, and is arranged in one component group by being connected to each other, and the blow air device is formed from a plurality of component groups extending to each partial surface, and each component group is It had one coupling part, which was connected via a compressed-air conduit to a control unit with a compressed-air supply, which was upstream of the component group. Further advantageous further developments according to the invention are described in the dependent claims.

[0007]

The blow-air device according to the invention consists of a plurality of blowing tubes which are connected to one another, these blowing tubes being arranged on a wall, preferably in the same row, to be unloaded. It has a relatively small opening directed at the leaflet. These openings are advantageously machined in the wall of the spray tube by drilling or punching. Each spray tube is made of an elastic or thermoplastic pressure-resistant plastic. The blow-air device is made up of modular components, each component being constituted by a blow-off tube as a functional component, the combined blow-off tubes being independent components with a separate compressed air supply. Form a group. It is advantageous if any number of spray tubes are connected to one another by connecting pieces, in particular by assembling by means of a side-by-side connection. Thus, the subgroups can be formed in any area and can be individually controlled with respect to the blown air load and the associated area by a separate compressed air supply. The diameter of the opening of the blowing tube is designed to be less than 1 mm, so that under compressed air loading, a focused air flow which is preferably largely laminar is achieved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

[0009] A sheet discharging device is provided after the printing device or finishing unit of the offset printing press. A circulating transport system 12 and a gripper system 1 arranged in the transport system 12
3, the sheet 11 gripped by gripping
Is fed to the delivery pile 5 in the sheet running direction 9 via the sheet guide surface 8, the sheet guide device 10 and the sheet braking device 7, and is unified at the edges. You. In order to reduce the speed and to quickly unload the sheet 11 to the delivery pile 5, a blow-air device 6 is arranged substantially horizontally above the delivery pile 5. In addition, the delivery device can be configured in a known manner with a trailing edge stopper 14, a leading edge stopper 15 and a lateral stopper 1 arranged adjacent to the sheet braking device 7.
6.

[0010] The blow-air device 6 is formed from a plurality of spray tubes 1 which are located in one plane and connected to each other. Each spray tube 1 is made of an elastic or thermoplastic plastic. Advantageously, polyamides are used. These spray tubes 1 are inserted into a connecting piece 2, for example, an angled piece or a T-shaped piece, and together with this connecting piece 2 form a component group 20, 21, 22. In the present embodiment, the spray tube 1 and the connecting piece 2 form a square element, but it is also possible to form other geometric shapes. Such geometric shapes are, for example, spray tubes arranged in a triangular shape and correspondingly shaped connecting pieces, or also blown tubes arranged in a meandering manner. Each component group 20, 21 and 22 has a joint 17 which is connected via a compressed air line 3 to the front part which supplies compressed air to all components 20, 21 and 22. Connected to the control unit 18. The control unit 18 controls the compressed air supply unit 1
9 is connected. Therefore, each of the constituent groups 20, 21, and 22
2 can be individually loaded with compressed air. Over the entire length of the spray tube 1, a plurality of relatively small openings are arranged in the same row on the wall of the spray tube 1. These openings are advantageously machined by drilling or stamping. These openings are directed to the sheet 11 to be unwound or the delivery pile 5. These openings are 1
It has a diameter of less than 1 mm and is spaced apart by about 10 mm. The spraying tube 1 and / or the connecting piece 2 are releasably arranged on a frame of the sheet discharging device. By the insertion connection of the spray tube 1 and the connection piece 2,
The spray tube 1 can rotate inside the connecting piece 2.
This makes it possible to additionally adjust the inclination of the opening 4, which is preferably located vertically with respect to the delivery pile 5, to the sheet 11 to be unwound or to the delivery pile 5. is there. Components 20 and 2 of blow air device
1 and 22 are individually formed by joining the spray tube 1 and the connecting piece 2, the opening 4 being directed towards the sheet 11 so as to have a predefinable inclination. . Assembling by spraying pipe 1 and opening 4
Is performed in relation to the weight per unit area of the sheet 11 to be unwound and / or the printed image.
The same applies to the configuration related to the area of each of the configuration groups 20, 21, 22. In FIG. 4, component group 20 forms a relatively small partial area, whereas component group 21 forms a larger partial area.

FIG. 2 shows a structural group 22. This structural group 22 includes four square partial structural groups arranged in one.
It is formed by forming two rectangles. The component group 22 is shown in a plan view such that the opening 4 of the spray tube 1 is not visible. The component group 22 has a joint 17 for separate compressed air supply, which in this embodiment is assembled in the coupling piece 2. The arrows in the drawing show the rotatable arrangement of the spray tube 1 in the coupling piece 2.

FIG. 3 shows a detailed view of the portion Y in FIG. 2 rotated by 180 ° so that the opening 4 can be seen. Due to the geometrically freely selectable arrangement of the spray tubes 1, it is also possible to achieve a very small spacing between the spray tubes.

The operation of the device according to the invention is as follows. From the transport system 12, the sheet 11 is transported in a known manner via the sheet braking device 7 to the area of the delivery pile 5. In the region of the blow-air device 6, the sheets 11 to be unloaded are loaded with blow-air from above. The blow air is applied to the central and trailing edges of the sheet 11. Blow air is supplied from the opening 4 as a relatively small amount of air having a high flow velocity, advantageously mostly in the form of laminar flow.
It flows out towards the surface of the sheet 11 to be unwound. In this case, the component group 22 arranged in the central area of the blow air device is first controlled by the control unit 18 with the compressed air, and subsequently the component groups 20 and 21 other than the central component are controlled. As a result, the blow air presses the sheet 11 in a planar manner against the delivery pile 5 at the center and / or at the end of the sheet, so that the air cushion under the sheet 11 is pushed laterally. Push away. By applying blow air, the sheet 11 is strongly bent in accordance with the weight per unit area, and the central area of the sheet 11 is, for example, in the case of paper, firstly the lower surface of the sheet 11 on the delivery pile 5. Contact. The air cushion still present on the side is then pushed laterally by the components arranged other than in the center. The relatively small amount of air having a high flow velocity, which is preferably largely in the form of laminar flow, significantly accelerates the unloading of the incoming sheet. At high flow rates, a range of 150 m / s or more is observed. In particular, the laminar flow causes the sheet to be moved from the sheet transport path to the delivery pile 5 more quickly. This is because the laminar flow can increase the falling speed. Thus, collisions with subsequent sheets or collisions with the gripper system are avoided.

In a further embodiment of the invention, a single-piece spray tube 1 made of an elastic or thermoplastic plastic with an opening 4 having a diameter of less than 1 mm is connected to one joint part 17 each. And can be individually controlled by the control unit 18 with compressed air. These spray tubes 1 are composed of components 20, 21, 22
In addition, they can be combined in relation to the area. The blow air device itself according to the present invention is an inexpensive means, can be assembled separately by a modular structure and a bayonet connection, and can be easily maintained.

[Brief description of the drawings]

FIG. 1 is a view of a sheet discharging device of a sheet-fed machine provided with a blow air device.

FIG. 2 is a plan view of a group of components of the spray tube.

FIG. 3 is a detailed view of a location Y of the spray pipe of FIG. 2;

FIG. 4 is a view of a blow air device having a group of components.

[Explanation of symbols]

1 spray tube, 2 connecting piece, 3 compressed air conduit,
4 opening, 5 discharge pile, 6 blow air device, 7 sheet braking device, 8 guide surface, 9 sheet running direction, 10 sheet guide device, 11 sheet, 12 transport system, 13 gripper system , 14 rear edge stopper, 15 front edge stopper, 16 side stopper, 17 joint part, 18 control unit,
19 compressed air supply unit, 20, 21, 22 component group

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Thomas Walter Germany Offenbach Hermann-Steinhauser Strasse 6 (72) Inventor Reinhard Rückert Germany Hanau Alter Rückinger Weg 9 (72) Inventor Nicola Poupik Germany Huisenstamm Franz-Lao-Strasse 32

Claims (10)

[Claims] 1. A blow air device for a paper discharge device provided in a processing machine, wherein a blow tube arranged in a plane above a discharge pile is provided. However, in the type in which the blow-out air is used to assist the sheet being wholesaled, and the sheet is transported by a transport system having a gripper system, and is transported to an output pile. A plurality of spray tubes (1) made of plastic, having relatively small openings (4) substantially oriented in the sheet (11) to be unwound and being joined together The blow air device is formed from a plurality of component groups (20, 21, 22) extending on each partial surface, and each component group (20, 21, 22) is arranged. , 21, 22) is one joint part (17) A control having a compressed air supply (19), said coupling part (17) being connected upstream of said component group (20, 21, 22) via a compressed air conduit (3) Unit (1
8) A blow air device for a sheet discharging device provided in a processing machine, which is connected to 8). 2. The blow-air device according to claim 1, wherein the spray tube is made of an elastic plastic. 3. The blow-air device according to claim 1, wherein the spray tube is made of a thermoplastic. 4. The blow-air device according to claim 1, wherein the spray tube is arranged horizontally in one plane. 5. The blast tube according to claim 1, wherein the openings are arranged in the same row on the wall of the spray tube by drilling.
A blow air device as described. 6. The blow-air device according to claim 1, wherein the opening (4) having a diameter of less than 1 mm produces a focused air flow, mostly in the form of a laminar flow. 7. The blow-air device according to claim 1, wherein the blast tube is detachably connected by a connecting piece. 8. Each of the blowing tubes (1) is rotatable about an axis of the blowing tube (1) inside the coupling piece (2). 2. The blow air device according to claim 1. 9. The blow-air device according to claim 1, wherein the component group is pneumatically loadable by the control unit in relation to the print image and / or the weight per unit area. 10. A single spray tube (1) having a small opening (4) and made of an elastic or thermoplastic plastic is connected to each one coupling part (17), The blow-air device according to claim 1, wherein the blow-air device is arranged in such a manner that it can be individually controlled by compressed air by a unit (18) in combination with the components (20, 21, 22).