JP2004099325A - Device for individualizing sheet from stacked sheets - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for individualizing a sheet from stacked sheets that can occupy only small configuration room and that can allow air guide sufficiently without a hose by improving the device including at least a suction gripper formed on a suction head placed above the stacked sheets, at least a transmitting device placed within a transmitting device frame for operating the gripper along a predetermined track, and a valve device for controlling sucked air at the suction gripper. <P>SOLUTION: A valve device 8 for controlling sucked air applied to a suction gripper placed at a suction head is placed within transmitting device frames 4, 25, and 26 having a transmitting device for operating the suction gripper along a predetermined track. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to an apparatus for separating sheets from a stack, comprising: at least one suction gripper provided on a suction head disposed above the stack; and the suction gripper. It is of the type having at least one transmission provided in the transmission frame for movement along a defined trajectory and a valve arrangement for controlling the suction air in the suction gripper.

From DE 19 29 714 A1 a suction head is known which is provided on a sheet feeder for a sheet processing machine. In this suction head, a separation suction port and a transport suction port are used to separate sheets from a stack and feed the sheets to a printing press. The suction head has a suction head casing with side walls, which suction head casing acts as a transmission frame. The separating mouth and the carrying mouth are moved up and down and back and forth periodically by the cam transmission and the vertical and horizontal parallel guides. The transmission element is located between the side walls and is mounted on the side walls. To control the suction air, a rotary valve is mechanically connected to a transmission element that controls the movement of the suction port. This rotary valve is mounted outside the suction head casing. This rotary valve has an outer, fixed position casing with an inner rotating rotating air distributor with a plurality of control passages and a plurality of connecting tubing for each hose leading to the mouthpiece. And consists of

The rotary valve arranged outside the suction head casing and the hose extending from the rotary valve increase the construction space, and furthermore, the components required for individual operation are arranged around the suction head. Make it impossible. If such components are displaced in the direction of the center line of the sheet transport path when the sheet width is small, there is a risk of collision with a rotary valve or a hose. This is because the suction head itself is arranged at the center of the transport path. The rotary valve disposed outside the suction head casing is troublesome in terms of cost and material. It takes time and effort to lay the air hose, which is inconvenient in terms of design.

In the solution described in DE 195 123 313, the rotary valve is not provided concentrically with respect to the main drive shaft of the cam transmission for the mouthpiece. This rotary valve is driven by an additional transmission having an adjustable phase position. This results in additional materials and costs.

From EP-A-1 085 541, a valve device consisting of two discs in contact with each other with an integrated control passage is disclosed. Such a valve device is difficult to seal.
German Patent No. 1929714 German Patent No. 19512313 European Patent Publication No. 1008541

The object of the present invention is therefore to improve a device for separating sheets from stacks of the type mentioned at the outset to provide an air guide with only a small amount of construction space and without a hose. It is to provide such a device.

According to the present invention, the above problem is solved by disposing the valve device inside the transmission frame.

According to the present invention, the valve device for controlling the suction air is disposed inside the transmission frame. The transmission frame supports a plurality of transmission elements, with the aid of which the mouthpiece moves along a defined trajectory. If the suction head housing is designed to be very stable and the transmission element can be mounted inside the housing, the valve device can also be located inside the suction head housing. This achieves a structure in which a plurality of air connections are laid in a fixed, i.e. immobile air distributor located inside, around which the outer rotor rotates. Can be. The outer rotor has a plurality of control passages therein and externally a cam disk or other transmission element such as a gear, belt pulley, or pinion. These transmission elements may be manufactured integrally with the rotor or connected to the rotor as separate elements. In order to adjust the control time of the rotary valve only once or during operation in relation to the timing of the sheet-processing machine, the inner air distributor is preferably moved around the axis of rotation of the rotor by a transmission. It can be adjusted and fixed manually or by motor relative to the frame or suction head casing. The installation space for the suction head can be reduced by installing the valve device inside the transmission frame or the suction head casing. The air guide to the inner air distributor can be installed through the wall of the suction head casing. This avoids external conduits or hoses. The air distributor located on the inside can be easily removed for service purposes and can be reassembled in the correct phase position.

The best mode for carrying out the present invention will be described below in detail with reference to the drawings.

FIG. 1 schematically shows a sheet feeder for a sheet-fed printing press. Sheets 2 prepared on a stacking board 1 are separated by a suction head 3. The suction head 3 has a sturdy casing 4, which acts as a transmission frame. The casing 4 is mounted on a cross beam 5, which is fixed between two side walls 6, 7 (FIG. 2). The suction head 3 includes a rotary valve 8, a cam transmission 9, a suction port 10 for lifting, and a suction port 11 for forward movement. The lifting suction port 10, the forward suction port 11 and the separating blower (not shown in FIG. 1), and the supporting air blower housed in the blowing foot are provided with pipes 12 and 13, a rotary valve 8 and a pipe 14. , 15 via a suction and blow-off air source 16. In order to adjust the individualization position, the pile 17 and the suction head 3 are height-adjustable in the vertical direction 18. By means of the cam transmission 9 and the further transmission elements and guides, the lifting mouthpiece 10 is moved vertically downwards, so that the upper side, which has been separated by the separating blower, is attracted. During the lifting movement of the lifting mouthpiece 10, the sheet 2 located above the pile 17 is lifted up and supported by the support air from the blowing foot, and at the same time is captured by the forward suction mouth 11. By means of another cam transmission 9, another transmission element and a guide, the individualized sheet 2 is moved horizontally over the front flap-type stopper by the advancement mouthpiece 11 into the feeder board 20. Sent in the direction 19. When the sheet 2 reaches the pair of conveying rollers 21 and 22, the suction air in the suction port 11 for advance is stopped. The transport roller pairs 21 and 22 transport the sheet 2 to another transport roller pair 23 and 24 via the feeder board 20, from which the sheet 2 is sent to the first printing device of the sheet printing press. Transported to

に お い て In the following description, elements having the same functions are denoted by the same reference numerals as those used in the description.

FIG. 2 is a plan view of the paper feeder shown in FIG. The suction head 3 is shown in section. The suction head 3 is fixed to the cross beam 5 at the center between the side walls 6 and 7 of the printing press. The rotary valve 8 is supported on both side walls 25 and 26 of the casing 4. The rotary valve 8 has a cylindrical air distributor 27, which is fixed to the side wall 25 by a flange 28. Passages 29, 30, 31, and 32 are provided in the flange 28 and the air distributor 27. The passages 30, 31 provided in the air distributor 27 have radial through holes 33, 34. A rotor 35 is rotatably mounted on the air distributor 27. The cylindrical hole provided in the rotor 35 is densely mounted on the air distributor 27. The rotor 35 is connected to a shaft 36, which is housed in a rolling bearing 37 on the side wall 7. To drive the rotor 35, a gear 38 is provided at the end of the shaft 36. This gear 38 is connected to the gear transmission of the sheet-fed printing press. The sealing surface of the rotor 35 facing the inside of the air distributor 27 has an overflow passage 39. These overflow passages 39 extend in the circumferential direction of the cylindrical hole of the rotor 35 over a predetermined angle range. The overflow passage 39 is arranged such that these overflow passages can communicate with the through holes 33 and 34 in the axial direction. Cam disks 40, 41, 42 are arranged outside the rotor 35, and cam rollers 43, 44, 45 run along these cam disks 40, 41, 42. The cam rollers 43, 44, and 45 include lifting mouths 10.1, 10.2, 10.3, and 10.4, forward suction mouths 11.1, 11.2, 11.3, and 11.4. It is a component of the transmission for controlling the movement of the blow foot along a defined trajectory. The lifting suction ports 10.1 to 10.4 and the forward suction ports 11.1 to 11.4 are fixed to rods 46, 47, 48, 49, and these rods 46 to 49 are connected to the aforementioned transmission. Connected to the device. The lifting suction ports 10.1 to 10.4 and the forward suction ports 11.1 to 11.4 are connected to suction air lines 50, 51, 52, 53, and these suction air lines 50 to 53 are connected. Communicates with passages 54 and 55 provided in the side walls 25 and 26 of the casing 4. These passages 54, 55 lead to holes provided in the casing 4 to which the flange 28 of the rotor 35 is fixed. The passages 54 and 55 are connected to passages 29 and 32 provided in the flange 28. The rotational position of the flange 28 or the air distributor 27 in the casing 4 can be adjusted. One passage 54 provided in the casing 4 is connected to a pipe 15 provided in the cross beam 5, and this pipe 15 communicates with a suction air source 16. Each time the overflow passage 39 bridges the two through holes 33 and 34 provided in the two passages 30 and 31 of the air distributor 27 when the rotor 35 rotates around the fixed position air distributor 27, A connection is formed between the lifting mouth 10 or the advancing mouth 11 and the suction air source 16.

Next, the air guide in the rotary valve 8 will be described with reference to FIGS.

The rotor 35 is supported by two ball bearings 56 and 57 provided on both side walls 25 and 26 of the casing 4. The position fixing rings 58 and 59 secure the position of the rotor 35 in the axial direction. The air distributor 27 is held on the side wall 25 while being prevented from being twisted by the flange 28. A cap 60 is arranged at an end of the air distributor 27 opposite to the flange 28. A ball bearing 62 is held on the cap 60 by a position fixing ring 61, and the ball bearing 62 is in contact with a hole of the rotor 35. The air distributor 27 has seven passages 30, 31, 63, 64, 65, 66, 67 extending in the axial direction therein. These passages 30, 31, 63-67 are delimited by walls 68, 69, 70, 71, 72, 73, 74, respectively, which face radially outward. As can be seen from FIG. 4, a plurality of passages 54, 55, 75, 76, 77, 78, 79 are formed in the side wall 25 in the circumferential direction of the flange 28. When the rotational position of the rotary valve 8 is adjusted, the passages 30, 31, 63 to 67 extending in the radial direction of the flange 28 are formed in such a width that they can be reliably opened in the passages 54, 55, 75 to 79 of the side wall 25. Have been.

At the rotational position of the rotor 35 shown in FIGS. 3, 4 and 5, a suction air connection is formed from the suction openings 11.1 to 11.4 to the suction air source 16 for the forward movement. The suction air 81 flows from the suction openings 11.1 to 11.4 via the suction air lines 52, 53 into the passage 54 in the side wall 25 of the casing 4 and through the passage 29 in the flange 28 to distribute the air. And flows into the overflow passage 39.1 through the through hole 33, and further flows into the passage 31 of the air distributor 27 through the through hole 34 through the overflow passage 39.1. Further, it flows into the passage 32 of the flange 28, further flows into the passage 55 of the side wall 25, and reaches the suction air source 16 from the passage 55 via the pipe 15.

Viewed in the circumferential direction of the lifting mouth 10.1 to 10.4, the forward mouth 11.1 to 11.4 and the overflow passages 39.2 to 39.4 for the blowing feet and the blower. The length and angular position are set such that the intake or blow-off air is provided at a desired time and for a desired time. Furthermore, since the overflow passages 39.1 to 39.4 have a fixed phase relationship with respect to the cam discs 40 to 42, the lifting suction ports 10.1 to 10.4 and the forward suction ports 11. It is assured that suction or blow-off air is provided at a predetermined position between 1-11.4 and the outflowing foot and the separating blower.

The rotor 35 performs a control function for the movement of the lifting suction port 10 and the forward suction port 11 in addition to the air control function by the overflow passage 39. The rotor 35 consists only of a single part, the precise manufacture of which ensures a precise phase relationship between the overflow passage 39 and the cam disks 40-42. The air distributor 27 can be easily removed for cleaning purposes. For this purpose, it is only necessary to unlock the flange 28 in the side wall 25 and the air distributor 27 can be removed in the axial direction 82 without tools and without removing the hose. For this purpose, a hand grip can be provided on the flange 28.

1 is a schematic side view of a sheet feeder for a printing press. It is a schematic plan view of a suction head. FIG. 3 is a cross-sectional view taken along a rotation axis of the rotary valve. FIG. 5 is a cross-sectional view of the rotary valve of FIG. 3 taken along line VV. FIG. 4 is a cross-sectional view of the rotary valve of FIG. 3 taken along the line IV-IV.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Stacking board 2 Sheet 3 Adsorption head 4 Casing 5 Cross beam 6, 7 Side wall 8 Rotary valve 9 Cam transmission device 10 Lifting suction port 11 Forward suction port 12, 13 Pipe line 14, 15 Pipe line 16 Suction / Blowing air source 17 Stacking paper 18, 19 direction 20 Feeder board 21, 22, 23, 24 Conveying roller 25, 26 Side wall 27 Air distributor 28 Flange 29, 30, 31, 32 Passage 33, 34 Through hole 35 Rotor 36 Shaft 37 Roller bearing 38 Gear 39 Overflow passage 40, 41, 42 Cam disk 43, 44, 45 Cam roller 46, 47, 48, 49 Rod 50, 51, 52, 53 Suction air conduit 54, 55 Passage 56, 57 Ball bearing 58, 59 Position fixing ring 60 Cap 61 Position fixing ring 62 Ball bearing 63, 64, 65, 66, 7 passage 68,69,70,71,72,73,74 walls 75,76,77,78,79 passage 80 circumferential 81 suction air 82 direction

Claims (7)

What is claimed is: 1. An apparatus for separating sheets from a stack, comprising: at least one suction gripper provided on a suction head disposed above the stack; A valve device (8) of the type having at least one transmission device provided in the transmission frame for movement along the valve and a valve device for controlling suction air in the suction gripper. Is arranged inside the transmission frame (4, 25, 26) for separating sheets from stacks. 2. The device according to claim 1, wherein the valve device (8) and the transmission (40, 41, 42, 43, 44, 45) are structurally integrated. The valve arrangement (8) is formed as a rotary valve having an inner fixed air distributor (27, 28) and an outer rotor (35) with a plurality of control passages (39). The device of claim 1, wherein 4. The device according to claim 3, wherein elements of the transmission, such as cam disks (40, 41, 42), gears or belt pulleys, are arranged outside the rotor (35). 4. The device according to claim 3, wherein the air distributor (27, 28) is positionally adjustable with respect to the phase with respect to the rotor (35) for adjusting the control time. The air distributor (27, 28) is formed as a hollow cylinder with a plurality of inner air guide passages (30, 31, 63, 64, 65, 66, 67), wherein said air guide passages are provided. 4. The device as claimed in claim 3, wherein the device is delimited by radially outwardly directed walls (68, 69, 70, 71, 72, 73, 74). The transmission frame (4) has two side walls (25, 26), on which air guides (54, 55, 75, 76) for the valve device (8). , 77, 78, 79).

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