Device for orienting sheet on feed table of sheet printing press

Abstract

The invention relates to a device for orienting a sheet on a feeding table (7) of a sheet printing machine. Comprising a top gauge (13), a first control cam (24) and a first roller lever (25) which are used for enabling the top gauge (13) to periodically swing below a page conveying path, and a second control cam (26) and a second roller lever (27) which are used for periodically adjusting the top gauge (13) to exceed a top gauge height (H) of a feeding table (7) in a page-to-page manner. The first roller lever (25) has a first lever arm (25.1) and a second lever arm (25.2), the top gauge (13) being mounted on the first lever arm (25.1) of the first roller lever (25), and the cam roller (28) being mounted directly on the second lever arm (25.2) of the first roller lever (25).

Description

Technical Field

[0001] The invention relates to a device for orienting sheets on an infeed table of a sheet-forming printing press, comprising a plurality of top gauges, a first control cam and a first roller lever for periodically pivoting the top gauges below a sheet transport path, a second control cam and a second roller lever for periodically adjusting the top gauge height above the infeed table sheet by sheet. Background Art

[0002] DE 196 00 793 C2 describes a device for orienting sheets on an infeed table. In this device, a top gauge is pivotable by means of a first cam control and its height can be periodically adjusted from sheet to sheet by means of a second cam control. This transmission system consists of a relatively large number of transmission components. This structural complexity results in high manufacturing costs and low maintenance requirements.

[0003] In DE 42 39 254 C2, DE 10 2009 001 190 B4 and EP 1 362 811 A2, a device with a top gauge is described respectively, which is not periodically height-adjustable. In these dissimilar devices, the top gauge is not adjusted page by page, but is only adjusted when needed. Summary of the Invention

[0004] The object of the present invention is to provide a device for orienting sheets on the infeed table of a sheet-fed printing press which has a relatively low structural complexity.

[0005] This object is achieved by a device for orienting sheets on a feed table of a sheet printing press, comprising a top gauge, a first control cam and a first roller lever for periodically swinging the top gauge below the sheet conveying path, a second control cam and a second roller lever for periodically adjusting the top gauge above the top gauge height of the feed table in a sheet-by-sheet manner, characterized in that the first roller lever has a first lever arm and a second lever arm, the top gauge is arranged at the first lever arm of the first roller lever, and the cam roller is arranged directly at the second lever arm of the first roller lever.

[0006] One advantage of the device according to the invention is its lower manufacturing costs and improved maintenance friendliness. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Improvements will be apparent from the following description of exemplary embodiments and the associated figures.

[0008] The accompanying drawings show:

[0009] Figure 1 : Schematic diagram of a printing press with a sheet orientation system,

[0010] Figure 2 : Enlarged view of the sheet orientation system,

[0011] Figure 3a 、 Figure 3b 、 Figure 3c : The sequence of movements of the system during sheet orientation and transfer,

[0012] Figure 4 : Schematic diagram of the transmission device of the sheet orientation system,

[0013] Figure 5a and Figure 5b : Different sheet thickness settings for the transmission, and

[0014] Figure 6 : Detailed stereoscopic view of the sheet orientation system. DETAILED DESCRIPTION

[0015] Figure 1 The figure shows a printing press having an arrangement of printing units 1, 2, 3, 4 for sheet offset printing, which are arranged between a sheet infeed 5 and a sheet delivery 6. The sheets are conveyed to the first printing unit 1 on an infeed table 7.

[0016] Figure 2 yes Figure 1 Enlarged view of detail II in FIG. Here, it can be seen that the front gripper 8 and the sheet orientation system 9 are arranged at the front end of the infeed table 7. The front gripper 8 performs a front gripper movement 10 in order to transfer the corresponding sheet from the infeed table 7 to the cylinder 11 in the first printing unit 1. The front gripper 8 is arranged at the front end of the infeed table 7. Figures 1 to 3c In the figure, which is shown in a simplified manner and therefore not visible, the front gripper 8 has an arrangement of clamping grippers which can grip the leading edge of an oriented sheet in order to hold the sheet.

[0017] Figures 3a to 3c The sheet orientation system 9 and the successive stages of the movement performed by the front gripper 8 are shown. Furthermore, it can be seen that the sheet orientation system 9 comprises a front guide 12 and a top guide 13.

[0018] Figure 3aThe diagram shows a sheet 15 being transported on the infeed table 7 in the sheet transport direction 14 with its front edge resting on the front guides 12 and thereby oriented. The front guides 12 project upward beyond the sheet transport plane of the infeed table 7. Top guides 13 project from the front into the area of ​​the infeed table 7, and the section of each top guide 13 that projects into the area of ​​the infeed table 7 runs parallel to the sheet transport plane of the infeed table 7 at a certain distance (top guide height H). These top guides 13 prevent the sheet 15 from bending too much upward when striking the front guides 12, so that the sheet 15 is pushed over the front guides 12.

[0019] exist Figures 3a to 3c What cannot be seen in the figure is that there are multiple front rules 12 and top rules 13, respectively, and these front rules 12 and top rules 13 are arranged in a row in a manner perpendicular to the image plane.

[0020] Figure 3b The diagram shows the phase following the orientation, in which the sheet 15 held by the front gripper 8 is conveyed past the front guide 12 to the drum 11. The front guide 12 is pivoted by means of a front guide movement 16 below a virtual sheet conveying path 17 for the sheet 15. Simultaneously, the top guide 13 performs a top guide movement 18 away from the infeed table 7, lowering the top guide 13 far enough below the sheet conveying path 17 that the sheet 15 can be conveyed over the top guide 13.

[0021] exist Figure 3c In the next stage shown in FIG, the sheet 15 is transferred from the front gripper 8 to the drum 11 at the sheet transfer point 19. The top gauge 13 performs a top gauge return movement 20 back to its initial position required for orienting the next sheet (compare FIG. Figure 3a ). Here, the sheet 15 passes over the rollers 21 arranged on the top guide 13. By means of the front guide return movement 22, the front guides 12 are moved upwards until they also reach their initial position again (compare Figure 3a ).

[0022] Next reference Figure 4 , Figure 5 and Figure 6 The transmission device 40 for moving the top gauge 13 is described, wherein Figure 4 , Figure 5 and Figure 6 Components cooperating with the top gauge 13 (ie, the front gripper 8 and the front gauge 12) are not shown together.

[0023] Figure 4As shown, these top gauges 13 each have a top gauge head 23 and a roller 21. A first control cam 24 and a first roller lever 25 are provided for periodically swinging the top gauge 13 into a position below the sheet transport path 17 in accordance with the sheet transport cycle. A second control cam 26 and a second roller lever 27 are used to periodically (sheet by sheet) adjust the top gauge 13 to a top gauge height H above the feed table 7 during printing operation. In this case, these top gauges 13 are adjusted from a so-called limiting height Descending to the so-called level height In order to press down the raised portion of the front edge of each sheet below the top gauge head 23, so that the front edge is flat. The top gauge height H between the top gauge head 23 and the feed table 7 can be Figure 4 The measurement is performed in the transmission position shown, in which the top gauge head 23 is opposite the front edge of the feed table 7 .

[0024] First roller lever 25 has a first lever arm 25.1 and a second lever arm 25.2. The top gauge 13 is arranged on the first lever arm 25.1, and a cam roller 28 is arranged on the second lever arm 25.2. The cam roller 28 is rotatably mounted directly in the first lever arm 25.1. Second roller lever 27 also has a first lever arm 27.1 and a second lever arm 27.2. A rotary joint 29 is arranged on the first lever arm 27.1 of second roller lever 27, and a cam roller 30 is arranged on the second lever arm 27.2 of second roller lever 27. First roller lever 25 is pivotably mounted in rotary joint 29 arranged on the first lever arm 27.1 of second roller lever 27.

[0025] The cam roller 28 of the first roller lever 25 rests against the outer contour of the disc-shaped first control cam 24, while the cam roller 30 of the second roller lever 27 rests against the outer contour of the similarly disc-shaped second control cam 26. A spring 32 disposed on the first roller lever 25 ensures that the cam roller 28 rests securely against the first control cam 24. The spring 32, which spring-loads the cam roller 28, is supported at one end on a frame 33 and at the other end on the first roller lever 25 (particularly its second lever arm 25.2). The spring 32 is designed as a compression spring (particularly a helical spring).

[0026] A modification (not shown) is possible for the spring loading of the cam roller 28. In this modification, the first roller lever 25 is composed of a first section within a second section, with the cam roller 28 arranged in the second section. The first and second sections are connected to each other via a rotary joint, and a spring 32, in a preloaded state, is supported with one spring end on the first section and with the other spring end on the second section. In this way, the two sections are tensioned against each other, pressing the cam roller 28 against the first control cam 24. In this case, the spring 32 can be designed as a leaf spring, for example. Alternatively, it is also possible for the spring 32 that tensions the sections to be designed as a torsion spring and arranged coaxially with the rotary joint, by which the first and second sections are connected.

[0027] Figure 4 It is also shown that the second roller lever 27 is supported in a pivotable manner and the rotary joint 31 is arranged so as to be adjustable via an adjusting element. The adjusting element is constructed as an eccentric 34, which will be referred to as the eccentric hereinafter for ease of understanding. The eccentric 34 is equipped with an adjustment drive 35 (see Figure 6 ) and serves to adjust the substrate thickness of the top gauge 13. When the eccentric 34 is adjusted about its rotation point 37, which is fixed to the machine frame, this results in a displacement of the rotary joint 31 substantially perpendicular to the sheet transport plane defined by the infeed table 7. By raising or lowering the top gauge head 23 relative to the infeed table 7, depending on the direction of rotation of the eccentric 34, the top gauge height H is increased or decreased, coordinated with the thickness of the sheets 15 to be processed during the respective print job.

[0028] A spring 36 is arranged on the second roller lever 27, via which the cam roller 30 is spring-loaded. A spring 35 is supported at one end on the second roller lever 27 and at the other end on the eccentric 34, thereby tensioning these two components against one another and preventing the cam roller 30 from lifting off the second control cam 26. The spring 36 is designed as a torsion spring and is arranged coaxially with the rotary joint 31. The first control cam 24 and the second control cam 26 are arranged coaxially with one another and are connected in a rotationally fixed manner by being fixed to a common drive shaft 39.

[0029] Figure 5a and Figure 5b The top gauge 13 is shown with different sheet thickness settings, wherein the spring loading of the roller levers 25, 27 is omitted for simplicity of illustration. Figure 5a The settings shown for thick sheets 15 are switched to their Figure 5bIn the illustrated setting for thin sheets 15, the top gauge height H decreases from a larger value H1 to a smaller value H2. It should be noted that the eccentric 34 allows for a continuous adjustment to any value between H1 and H2. When switching from a top gauge height of H1 to a top gauge height of H2, the two cam rollers 28 and 30 are automatically displaced relative to their respective associated control cams 24 and 26. The center point position of the cam roller 28 changes from E1 to E2, and the center point position of the cam roller 30 changes from D1 to D2.

[0030] The effect of the center point position change is explained using the cam roller 28 and the first control cam 24 as an example: Figure 5a It is shown that, when the top gauge 13 is set high, the determined curve point is located at the curve point position a. This curve point is a virtual point on the curve profile of the first control cam 24 and marks the beginning of the top gauge movement 18 (compare Figure 3b ). When the top gauge 13 is set high (larger value H1), the first control cam 24 passes through the angle α1 until the curve point in the curve point position b contacts the cam roller 28. The angle α1 is developed between the two curve point positions a and b.

[0031] Figure 5b It is shown that when the top gauge 13 is set low (smaller value H2), the first control cam 24 passes through the angle α2 until the curve point in the curve point position c contacts the cam roller 28. The angle α2 extends between the two curve point positions a and c and is greater than the angle α1.

[0032] Therefore, the transmission device produces a phase shift (Phasenverschiebung) of the top gauge movement when adjusting the top gauge height H. This has the advantage that the top gauge movement is coordinated with the closing of the front gripper 8, and the greater the thickness of the printing material, the earlier the action is performed.

[0033] Figure 6 The sheet orientation system 9 of the sheet feeder 5 is shown in three dimensions, without the front guide 12 for reasons of clarity. It can be seen that the sheet orientation system 9 has two transmission devices 40 arranged side by side for setting and driving the top guide 13. The two transmission devices 40 correspond to Figures 4 to 5b The two control cams 24, 26 of one transmission 40 are arranged coaxially and connected in a rotationally fixed manner to the two control cams 24, 26 of the other transmission 40. The four control cams 24, 26 of the two transmissions 40 are mounted on a common drive shaft 39, which can be composed of multiple sections.

[0034] An additional advantage of this dual arrangement is that the transmission structure is more rigid and less susceptible to wear.

[0035] List of reference numerals:

[0036] 1 Printing Agency

[0037] 2 Printing Agency

[0038] 3 Printing institutions

[0039] 4 Printing Agency

[0040] 5-sheet feeder

[0041] 6-sheet stacker

[0042] 7 Feeding station

[0043] 8 Front grabber

[0044] 9 Sheet Orientation System

[0045] 10 Front gripper movement

[0046] 11 Roller

[0047] 12 front rules (Vordermarke)

[0048] 13 Top Rules

[0049] 14 Sheet transport direction

[0050] 15 pages

[0051] 16 Pre-rule Movement

[0052] 17-sheet transport path

[0053] 18 Top Rule Movement

[0054] 19 Sheet Transfer Points

[0055] 20 Top gauge return movement

[0056] 21 Roller

[0057] 22 Forward return movement

[0058] 23 First control cam

[0059] 24 Second control cam

[0060] 25 First roller lever

[0061] 25.1 First lever arm

[0062] 25.2 Second lever arm

[0063] 26 Second control cam

[0064] 27 Second roller lever

[0065] 27.1 First lever arm

[0066] 27.2 Second lever arm

[0067] 28 Cam roller

[0068] 29 Rotary hinge

[0069] 30 Cam roller

[0070] 31 Rotary hinge

[0071] 32 Spring

[0072] 33 racks

[0073] 34 eccentric piece

[0074] 35 Adjustment drive

[0075] 36 Spring

[0076] 37 Rotation Point

[0077] 38 Conditioning Exercise

[0078] 39 drive shaft

[0079] 40 Transmission

[0080] a Curve point position

[0081] b Curve point position

[0082] c Curve point position

[0083] D1 center point position

[0084] D2 center point position

[0085] E1 center point position

[0086] E2 center point position

[0087] H top gauge height

[0088] H1 value

[0089] H2 value

[0090] α1 angle

[0091] α2 angle

Claims

1. A device for orienting sheets (15) on an infeed table (7) of a sheet-forming printing press, comprising: - Top gauge (13), - a first control cam (24) and a first roller lever (25) for periodically swinging the top gauge (13) below the sheet transport path (17), - a second control cam (26) and a second roller lever (27) for periodically adjusting the top gauge (13) above the top gauge height (H) of the feed table (7) on a sheet-by-sheet basis, It is characterized in that The first roller lever (25) has a first lever arm (25.1) and a second lever arm (25.2), The top gauge (13) is arranged on the first lever arm (25.1) of the first roller lever (25), and A cam roller (28) is arranged directly on the second lever arm (25.2) of the first roller lever (25).

2. The device according to claim 1, It is characterized in that The second roller lever (27) has a first lever arm (27.1) and a second lever arm (27.2), A rotary joint (29) is arranged on the first lever arm (27.1) of the second roller lever (27). The first roller lever (25) is supported in a pivotable manner in the rotary joint (29) arranged on the first lever arm (27.1) of the second roller lever (27), and A cam roller (30) is arranged on a second lever arm (27.2) of the second roller lever (27).

3. The device according to claim 1 or 2, It is characterized in that The second roller lever (27) is supported in a pivotable manner in a rotary joint (31), and The rotary joint (31) in which the second roller lever (27) is pivotably mounted is arranged so as to be adjustable by means of an adjusting element.

4. The device according to claim 3, It is characterized in that The adjusting element is an eccentric (34).

5. The device according to any one of claims 1 to 4, It is characterized in that A spring (32) is arranged on the first roller lever (25), by which the cam roller (28) of the first roller lever (25) is spring-loaded.

6. The apparatus according to any one of claims 2 to 4, It is characterized in that A spring (36) is arranged on the second roller lever (27), by which the cam roller (30) of the second roller lever (27) is spring-loaded.

7. The apparatus according to any one of claims 1 to 6, It is characterized in that The first control cam (24) and the second control cam (26) are arranged coaxially with each other and are connected in a rotationally fixed manner.

8. A sheet orientation system, in, A first device and a second device are arranged side by side, the first device is configured as a device according to any one of claims 1 to 7, the second device is configured as a device according to any one of claims 1 to 7, and The first control cam (24) and the second control cam (26) of the first device and the first control cam (24) and the second control cam (26) of the second device are arranged on a common drive shaft (39).

Images