JP2935683B2 - Sheet guide drum for sheet printing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet guiding drum for a sheet printing machine, wherein at least one substantially trapezoidal trapezoidal member is provided on one side of the sheet guiding drum, and is mirror-image symmetrical with the member. Facing, on the other side of the sheet guiding drum, at least one second
The present invention relates to the type in which these substantially trapezoidal trapezoidal members guide and support a sheet having a high bending strength (stiffness) without rubbing the surface.

[0002]

2. Description of the Related Art In a known sheet guide drum of this type, the substantially trapezoidal trapezoidal member is configured as a truncated cone-shaped roller and is fixed to the drum shaft. The trapezoidal trapezoidal roller is solid, except for a hole through which the drum shaft is inserted and a cutout on the outer surface into which the gripper table of the transport chain fits (DE 41 11 262). This known sheet take-out drum (sheet guide drum) composed of a drum shaft and a conical trapezoidal roller receives a printed sheet from a sheet offset rotary printing press and passes it to a transport chain, which separates the sheet. To a printing device or a paper discharging device. For this purpose, the conical trapezoidal rollers facing each other as sheet guiding means bring the sheet with high bending strength to the desired radial position and guide it further in the axial direction. Thus, a sheet with a high bending strength, for example cardboard or sheet metal, can be guided around the sheet take-out drum by contacting only the side edges with the conical trapezoidal roller without rubbing its surface.
However, this known sheet take-out roller cannot guide thin sheets in a manner that their surfaces are rubbed, in other words without contact. The maximum support width for guiding and supporting the sheet is related to the thickness and stiffness of the sheet material and is chosen such that the central range of the width of the sheet does not sag. In order to prevent the central area of the width of the thin sheet from sagging, it is not possible to provide additional mechanical, pneumatic or other sheet guiding means on the drum shaft between the conical trapezoidal rollers, as is known. It is possible, but then the risk of rubbing the surface of the sheet increases again.

[0003] A thin sheet is guided around the outer periphery of the sheet drum, and a blowing air passage is inserted into a wire drum whose outside is partially covered by a fixed sheet guide member. Is known (US Pat. No. 3,334,897). In this case, the printed sheet taken out of the impression cylinder by the gripper is pressed against the stationary sheet guide by the blowing air flow.

It is also known to take out varnished thin sheets so that a blowing air tube in a drum presses against a stationary sheet guide.

[0005] However, both of these known devices cannot convey a sheet having high bending strength without contact.

[0006]

The problem to be solved by the present invention is to improve a sheet guide drum of the type mentioned at the outset, so that a sheet having a high bending strength (stiffness) or a double-sided printing can be obtained. Even a thin sheet that can be formed is guided without rubbing its surface, and is guided to, for example, a paper discharge device. Furthermore, the sheet guiding drum can be adapted to different dimensions of the sheet.

[0007]

In order to solve this problem, according to the structure of the present invention, in a sheet guide drum (sheet take-out drum) of the type described above, a substantially conical trapezoidal member is formed of a hollow sheet guide ring. is configured as, Made up as conical jacket range of these sheet guiding ring is transmitted through the air blowing, at least one blowing air flow, respectively in the interior of these sheet guiding ring is made to flow into a sheet Various dimensions of
In order to comply with the law, the seat guide rings must be
Was sliding possible and fixable der so that axially manner.

[0008]

[0009]

In a preferred embodiment, at least two hollow sheet guide rings are arranged on each side of the sheet guide drum, the outer one of each of the two sheet guide rings being provided. Is larger than the inner sheet guide ring, and when the two rings are butted against each other and partially fitted together, a unitary, substantially conical trapezoidal member is formed, and the outer ring is formed. It is almost closed, in other words, except for the holes through which the blowing air passes .

In this embodiment, the inner sheet guide ring is smaller than the outer sheet guide ring so that the side facing the inner sheet guide ring is smaller than the outer sheet guide ring so that small-sized sheets can be guided without contact. It can be swiveled into the open outer seat guide ring and can be fixed to the first seat guide ring in this position.

[0011] It is advantageous if the blown air-permeable conical outer region has perforations that allow the blown air to pass through.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be specifically described below based on embodiments shown in the drawings.

In FIG. 1, the sheet offset rotary printing press has printing devices indicated by reference numerals 1 and 2 as a whole, and a varnishing device 3 is provided following these printing devices 1 and 2. A sheet take-out drum (sheet guide drum) 5 is provided so as to cooperate with the impression cylinder 4 of the varnishing device 3.
The members shown in FIG. A transport chain 6 having a gripper member (not shown) is guided around the sheet take-out drum 5. The printed and varnished sheet is removed from the last impression cylinder 4 by the sheet removal drum 5. The transport chain 6 transports the taken-out sheet to a schematically illustrated sheet discharging device by means of a sheet ascending transport section 6a.

In the sheet take-out drum 5, the direction of the printed and varnished sheet is changed. In this case, the sheet must be guided radially and axially. The components used according to the invention for this purpose are shown in FIGS.

The sheet guide drum, the so-called sheet take-out drum 5, has, in the embodiment shown, two sheet guide rings 7, 8, or 9, 10 each having a frustoconical shape on each side of the drum. , These seat guide rings 7 to 10 are arranged coaxially. The sheet guide rings 7 to 10 are hollow, have a conical outer area with perforations 11 and are blast air permeable. Inside 1 of each seat guide ring 7-10
A blowing air flow is caused to flow into 2. These blowing air flows are indicated by arrows 13 and 14 in FIGS. The inlet for the blowing air flow for the sheet guide rings 8 and 10 is formed by the open end faces 15 and 16 of the sheet guide rings 7 and 9.

The seat guide rings 7, 8, 9 and 10 are mounted on a central axis, not shown, with both larger seat guide rings 7 and 9 being on the outside and mirror-symmetrical to one another. The two smaller sheet guide rings 8 and 10 are mirror-inverted from one another on the inside.

The state shown in FIG. 2 is a case in which a sheet having the maximum size is guided, and the sheet guide rings 7 to 10 which can be slid along the central axis are separated from each other.
Clearances are formed at the end faces 15 and 16 and between the sheet guide rings 8 and 10. In FIG.
Printed and varnished sheets guided around sheet guide rings 7 to 10 are perforated 11
Are guided radially and axially by blowing air which flows obliquely through as indicated by arrows 17, 18, 19 and 20. In this case, the thin flexible sheet does not contact the sheet guide rings 7-10. As the thickness of the sheet increases, contact may occur only between the conical outer areas of the sheet guide rings 7 and 9 on both sides and the side edges of the sheet.

In FIG. 3, the pairs of seat guide rings 7 and 8 or 9 and 10 are respectively contracted, and both pairs of seat guide rings abut each other. The seat guide rings of each pair partially fit inside and outside of each other, and all the seat guide rings 7
Are fixed in their positions by means not shown. In this state, small-sized sheets can be guided perfectly without contact. Even in this state, the blowing air still flows out obliquely.

FIG. 4 is a perspective view showing the seat guide rings 7 to 10 in the adjusted state of FIG. Each pair of seat guide rings 7 and 8 or 9 and 10
Forming a generally conical trapezoidal member,
The outside is almost closed. Seat guide ring 7
The printed and varnished relatively stiff sheet 21 is guided radially and axially by the bevel formed by the conical outer ridges of the sheet guide rings 7 and 9, especially the outer sheet guide rings 7 and 9. 2 to 4 are shown very schematically for clarity.

[0020]

The principle of the present invention is that the blowing air flows from the outside of the cone of the sheet guide ring to a thin sheet printed on both sides and possibly varnished, and guides the sheet in a non-contact manner in the axial and radial directions. It is to be. By means of the sheet-guiding drum according to the invention and the usual stationary sheet-guiding members, sheets of various materials are perfectly guided.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an arrangement of a sheet take-out drum (sheet guide drum) in a sheet offset printing press.

FIG. 2 is a schematic view showing a sheet guide ring according to the present invention forming a sheet take-out drum in an adjusted state when a sheet width is maximum.

FIG. 3 is a schematic diagram showing a seat guide ring in an adjusted state when a seat width is small.

4 is a schematic perspective view showing a state in which a stiff sheet is guided by a sheet guide ring in an adjusted state of FIG. 3;

[Explanation of symbols]

1 and 2 printing device, 3 varnishing device, 4 impression cylinder, 5 sheet take-out drum (sheet guide drum), 6 transport chain, 6a sheet ascending transport section, 7
・ 8 ・ 9 ・ 10 Seat guide ring, 11 perforations, 12 inside, 13.14 arrows, 15
・ 16 end face, 17 ・ 18 ・ 19 ・ 20 arrow, 21
Sheet

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-96706 (JP, A) JP-A-60-29628 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B65H 5/00-5/38 B65H 29/00-29/70 B41F 21/08

Claims (4)

(57) [Claims] 1. A sheet guide drum for a sheet printing machine, wherein at least one member having a substantially conical trapezoidal shape is provided on one side of the sheet guide drum. It has at least one second member other substantially frustoconical in side is provided
The sheet guide drum is made up of only a conical trapezoidal member.
Of such a configuration that these substantially conical trapezoidal members are adapted to guide and support a sheet with high bending strength without rubbing the surface, the substantially conical trapezoidal member being hollow is configured as a sheet guide ring (7 to 10), conical jacket range Made up to transmit the air blowing, these sheet guiding rings of these sheet guiding ring (7-10) ( Each of at least one blowing air flow is introduced into the interior (12) of each of 7 to 10) ,
Seat guide ring to accommodate various sizes of
Whether (7-10) can slide in the axial direction relatively to each other
One fixable der Rukoto characterized, sheet guiding drum of the sheet printing machine. 2. At least two hollow sheet guide rings (7.8, 9; 9) on each side of the sheet guide drum.
10) are arranged, and the outer sheet guide ring (7; 9) of each of the two sheet guide rings (7.8; 9/10) is disposed inside the inner sheet guide ring (8; 1).
0), each having two rings (7.8);
9 and 10), when they are abutted with each other and partially fitted together, a unitary substantially conical trapezoidal member is formed, and its outer shell is substantially closed. Item 2. A sheet guide drum according to Item 2. 3. The outer seat guide ring (8; 10) is smaller than the outer seat guide ring (7; 9) and the side facing the inner seat guide ring (8; 10) is open. It can slide in the seat guide ring (7; 9), and in this position the outer seat guide ring (7; 9).
4. The sheet guide drum according to claim 3, wherein the sheet guide drum can be fixed indirectly or directly to the sheet guide drum. Characterized in that wherein spray cone mantle range make permeable to air has a large number of small holes for transmitting air blowing, sheet guiding drum according to any one of claims 1 3 .