JP2002012332A - Paper feeder stand - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper feeder stand applicable to sheets of paper of many types and capable of changing the direction without applying excessive force to the sheets of paper. SOLUTION: The sheets of paper are supplied almost in horizontal from a stack of paper provided on a paper feeder to the paper feeder stand for supplying the sheets of paper to a paper working machine. The paper feeder stand is inclined to a paper feeding plane. A paper feeding barrel is provided upstream of the paper feeder stand, and the circumference of the paper feeding barrel is provided on or near the paper feeding plane. A paper feeding roller is provided in a paper feeding barrel area almost right above a curvature point area between the paper feeding plane and the paper feeder stand, thereby permitting the contact of the sheets of paper with the paper feeding barrel and the directional change from the paper feeding plane to the plane of the paper feeder stand. At least two paper feeding rollers 3 are provided to be adjustable for contacting the form ends of the sheets of paper 2 supplied in parallel to the direction of feeding the sheets of paper 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeder for feeding sheets to a sheet processing machine, in particular to a printing press. The sheet feeder is capable of feeding sheets from the sheet feeder in a substantially horizontal sheet supply surface, is inclined with respect to the sheet supply surface, and has a bent point area between the sheet supply surface and the sheet supply plate. A deflecting roller is provided substantially upwardly, and the deflecting roller deflects the sheet from the sheet feeding surface to the surface of the sheet feeding table.

[0002]

BACKGROUND OF THE INVENTION It is known to use a pair of deflecting rollers above such a feed table to deflect a sheet to be fed. Such a pair of direction change rollers is configured such that individual rollers are provided on a common support portion in front and behind as viewed in the sheet feeding direction. In such a configuration, the direction changing roller located rearward in the sheet feeding direction is rotatably driven by the direction changing roller located forward in the sheet feeding direction. Further, a pair of direction change rollers are fixed at a fixed position with respect to the sheet feeding table. When the quality or type of sheet to be processed is changed, it is necessary to replace the pair of deflecting rollers in order to meet the respective conditions. Such devices have the disadvantage of being costly to drive the deflecting rollers and being too short since the deflecting area consists of only two deflecting points.

[0003]

[Problems to be Solved by the Invention] German Utility Model Publication 29
It is known from JP 7 04 796 that such a pair of direction-changing rollers is brought into contact with a sheet feeding table by adjusting the force by a pneumatic cylinder. With this device, the direction of the newly fed sheet is surely changed, but the sheet may be distorted due to a corresponding force. Therefore, such sheets may not be fed correctly to the sheet processing machine. German Utility Model Publication No. 299 00 995 discloses a sheet feed table having a pair of direction change roller devices. In this turning roller device, the turning rollers provided before and after cross each other at an alignment line. The deflecting roller device is provided so as to be adjustable while being spaced apart from the sheet supply table or the sheet supply surface, and bends at the bending point to contact the lower surface without applying a constant pressure to the sheet.

[0004] All of the above-mentioned devices have the disadvantage that they affect the surface of the sheet to be turned more or less. For expensive printing materials and delicate sheets,
These drawbacks easily deform or damage the printing surface.

It is therefore an object of the present invention to be able to process very many types of sheets, especially high-rigidity sheets, without exerting force, and to ensure that all sheets are oriented. It is an object of the invention to provide a feeder of the type described which is converted and fed so as to be transported more accurately from the feeder, in particular such that the surface area to be printed on the center of the sheet is not damaged.

[0006]

SUMMARY OF THE INVENTION This object is achieved according to the invention by providing a pair of deflecting rollers at the end of a conveyor table. In this case, the deflecting roller is separated perpendicularly to the surface of the sheet feeder,
It is formed to work when it is necessary to supply a printing material of a certain thickness. In addition, the deflecting roller is connected to a laterally located scanning device which can be adjusted manually or automatically to the side edges of the sheet pile to be separated. The diverter roller is also biased by a spring to adjust the base position relative to the feed roller. The direction change roller is freely rotatable, and is provided so as to minimize the load on the surface of the printing material. The deflecting roller and the paper feed device are connected to the side edge scanning device for stacking paper. When the plate is automatically adjusted, the deflecting roller is automatically adjusted to the side edge of the sheet. It is configured to be adjusted. A further deflecting roller is provided in the central area of the sheet, so that when the deflecting roller on the side adjusts the form, the deflecting roller on the side also adjusts for the smallest form of the sheet. I can do it. Such a device is particularly advantageous when a sensitive printing material is to be supplied, which has a large thickness, so that a large resistance must be generated during the turning. In such a case, the supply capacity must be large,
The risk of surface damage also increases. Providing the deflecting rollers on the sides ensures that this is not the case.

[0007]

Embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a feed cylinder 1 on which a sheet 2 to be conveyed abuts. A paper feed roller 3 is provided for the paper feed cylinder 1. Since the paper feed roller 3 presses the sheet 2 against the paper feed cylinder 1, the paper feed cylinder 1 can move the sheet 2 forward. In this figure, the sheet 2 is arranged in a horizontal state as it arrives from the surface of the paper feeder stack. In such an arrangement, it is assumed that the paper feeder stack is provided on the right side of the paper feed cylinder 1 and the paper feed table is provided obliquely downward and to the left of the paper feed cylinder 1. Therefore, the sheet 2 to be conveyed is moved from the horizontal state in the conveying direction inclined obliquely downward by the advancing force of the paper feed cylinder 1. For this purpose, turning rollers, not shown in the figure, are provided, but these rollers can be provided in pairs in the central area of the sheet or more. For this purpose, as described in the prior art, a device is used which consists of a large number of guide rollers, for example provided in a curved manner in the longitudinal direction and which does not exert any pressure on the sheet.

The paper feed roller 3 shown in FIG. 1 is suspended on a rotatable lever 4. The rotatable lever 4 is a holder 5
, And is movable in the direction of the rotation axis of the paper feed roller 3. The holder 5 is movably suspended on a guide bar 6. The holder can be fixed in the axial direction of the guide rod 6. A separation device 7 is provided between the holder 5 and the lever 4. This separating device 7 has a pressing spring 8, the action of which can be adjusted. By arranging the nut 9 forming the support for the pressing spring 8 at a distance from the lever 4, the operation start point of the sheet feeding roller 3 can also be adjusted. The pressing spring 8 operates only when the lever is lifted up to the vicinity of the nut 9 together with the sheet feeding roller. In other words, it does not work unless the printing material has a certain thickness. In the sheet transport area on the paper feed cylinder 1, the sheet 2 is fed at a time in a state of being shifted and overlapped, so that the paper 2 is overlapped at least twice.
Lifted far away from. In the case of a relatively thin printing material, the paper feed roller 3 provided on the lever 4 at this time is
It moves upward while applying only its own weight to the sheet to be sent. The pressing spring 8 has not yet been loaded. The effect on the sheet 2 to be transported is still slight. Due to the low contact forces on thin printing materials, no dangerous breakage occurs in the corners of the sheet. By adjusting the nut 9, the pressing force of the pressing spring 8 is exerted on the sheet 2 to be fed only when the thickness of the printing material has reached a constant value. For the pressing force, select the appropriate pressing spring 8 and the nut 9
Can be made to act extensively and very sensitively by adjusting.

FIG. 2 shows the arrangement of the paper feed roller 3 in the moving direction. The paper feed roller 3 is provided in a side end region of the paper feed cylinder 1. As shown in detail in the figure, the paper feed roller 3 is guided by a lever 4 to a holder 5 and is guided by a holding rod 6 via the holder. Paper feed roller 3
Is suspended by the above-mentioned member so as to be able to rotate obliquely toward the paper feed cylinder 1 when viewed in the axial direction. The feed roller is thus moved over the feed cylinder 1 by the sheet 2
Adjusted to the end of

FIG. 3 shows the relationship between the feed roller 3 and a so-called side edge scanning device 10 for a sheet stack 11 of a sheet feeder. As is clear from this figure, the holder 5 of the paper feed roller 3 is connected to the holder 12 of the side edge scanning device 10. The side edge scanning device 10 must always be adjusted with respect to the side edge 13 of the sheet stack 11 provided in the sheet feeding device, and after the basic adjustment, the feed roller 3 is also adjusted. It is always adjusted with respect to the side edges of the sheet 2. If the side edge scanning device 10 is automatically adjustable with respect to the side edge 13 of the sheet pile 11, the feed roller 3 is also automatically adjusted with respect to the edge of the sheet. Is done.
In the figure, in order to further feed the sheet from the horizontal plane to the inclined surface of the sheet feed table 16, above the sheet feed cylinder 1, an adjusting device 14 and a direction changing roller 15 for the two sheets fed in a stack.
And other guide devices. Direction change roller 1
5 is provided in the center of the paper feed table 16 as long as the laterally provided paper feed roller 3 is adjustable with respect to the edge of the smallest printing form of the sheet to be processed.

Not only one paper feed roller 3 but also two or more paper feed rollers 3 can be provided in front of and behind to expand the concept of the present apparatus. In this case, the first paper feed roller mainly transmits the forward force, and the second paper feed roller can act to guide the sheet 2 better to the inclined surface of the paper feed table 16. In this way, the load of the delicate sheet material is transferred to the edge area and no load is applied to the printing area.

The load of the paper feed roller 3 can be automatically adjusted. These paper feed rollers 3 are automatically activated, for example, by being brought into contact with the air pressure.
The fact that it can be arranged according to the form by connecting it to the side edge scanning device is already incorporated. By adjusting the pressing spring 8 with respect to the position of the paper feed roller 3, an arrangement corresponding to the thickness of the sheet is realized.

[Brief description of the drawings]

FIG. 1 is a side view of a paper feed roller.

FIG. 2 is a longitudinal side view of a sheet feeding roller at a sheet-side end portion.

FIG. 3 is a plan view of a paper feed cylinder arrangement including a paper feed roller and a direction change roller.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Paper feed cylinder 2 Sheet 3 Paper feed roller 4 Lever 5 Holder 6 Guide rod 7 Separation device 8 Pressing spring 9 Nut 10 Side edge scanning device 11 Sheet paper 12 Holder 13 End portion 14 Adjustment device 15 Direction change Roller 16 Paper feed table

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Thomas Walter Germany 63579 Freigericht Kurt-Schumacher-Strase 16 F-term (reference) 2C020 AA02 3F343 FA02 FA06 FB05 FC17 GA01 GD01 HD09 HD15 HE11 HE25 JA14 KB02

Claims (5)

[Claims] 1. A sheet feeder for feeding a sheet to a machine for processing sheets, in particular a printing press, the sheet feeder being provided in a sheet feeder. A sheet is supplied from a paper stack in a substantially horizontal paper feed surface, the paper feed tray is inclined with respect to the paper feed surface, and a paper feed cylinder is provided upstream of the paper feed tray. The circumference of the paper cylinder is provided at or near the paper supply surface, and a paper supply roller is provided in a paper supply cylinder region substantially above a bending point region between the paper supply surface and the paper supply table. The sheet is brought into contact with the feed cylinder and, if appropriate, at a feed table which is turned from the feed surface to the feed surface, parallel to the feed direction of the sheet (2). At least two paper feed rollers (3) are provided so that they can be adjusted so as to abut against the edge of the plate of the supply sheet (2). Paper feed tray that. 2. The paper feed roller (3) is mounted on a holder (5; 12) which is adjustable transversely to the paper feed direction and is provided on the side edge (13) of the sheet pile (11). 2. The sheet feeding table according to claim 1, wherein the sheet feeding table is adjustable together with a member that scans the sheet. 3. The paper feed table according to claim 1, wherein the paper feed roller (3) is rotatably supported. 4. The paper feed roller (3) is provided so as to be adjustable with a minimum distance from the surface of the paper feed cylinder (1) according to the thickness of the sheet (2). The sheet feeding table according to any one of claims 1 to 3, wherein the sheet feeding table is provided. 5. The paper feed roller (3) is contacted by a contact force.
The position is determined to determine the minimum distance position, and the adjustment is performed by not applying a load to the paper supply cylinder or applying a load only by its own weight when the paper supply roller is a printing material having a relatively small thickness. 5. The paper feed table according to claim 4, wherein the printing material is automatically loaded when the printing material is larger than or equal to the minimum distance.