JPH0730243U - Sheet feeder for sheet-fed printing press - Google Patents

Abstract

(57) [Summary] [Purpose] The air blowing nozzle and the paper presser weight should always occupy the best position regardless of the change in the state of the paper stacked on the paper stack. [Structure] A screw portion 41a of an adjusting cock 41 equipped with a nozzle 42 that blows air between the first sheet 25 and the second sheet 25 and below stacked on a stacking plate is moved up and down. It was screwed into the screw hole 37a of the free paper pressing weight 37.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a sheet-fed printing in which air is blown between sheets of paper stacked on a paper stack with an air blower to separate them, and the sucker of a sucker sucks them one by one and feeds them onto a feeder board. The present invention relates to a sheet feeding device of a machine.

[0002]

[Prior art]

 In the sheet feeding device of a sheet-fed printing press, the paper stacked on the paper stack is sucked by a pair of left and right suction ports provided in the sucker, then captured by the paper feed rollers and sent out onto the feeder board. However, in this case, it is necessary to accurately suck the sheets of paper one by one through the suction port, so an air blower that separates the paper sucked by the suction port from the next sheet is provided near the top edge of the stack of paper. Has been.

FIG. 5 is a front view of a conventional paper feeding device equipped with this type of air blowing device. This will be described with reference to FIG. Printing papers 3 are stacked on the paper stack 2, and above the stacked papers 3, a sucker device 4 supported by left and right paper feed frames is provided.

The sucker device 4 is supported by a sucker frame 5 which is vertically and longitudinally movable and is connected to an intake port such as an air pump (not shown) such as an air pump by a hose or the like so that the sucker device 4 can move vertically. A pair of first suction ports 6 are provided, and between these left and right first suction ports 6, as an air blowing member that also functions as a paper retainer that presses the rear edge of the paper 3 stacked on the paper stack plate 2 from above. Blow-out foot 7 is provided.

In front of the first suction port 6, a pair of vertically movable left and right second suction ports 8 connected to a suction port of the air pump or the like by a hose are supported by the sucker frame 5. It is provided. Behind the rear end of the stacking paper 3, there is provided a separator 9 having a nozzle connected to an exhaust port of the air pump or the like by an air hose or the like. Further, a paper pressing weight 10 that presses the upper surface of the paper 3 by its own weight is provided on the side of the separating sheet 9.

Reference numeral 11 is a horizontal pad that is pressed against the side surface of the stacked paper sheets 3 to align the paper sheets 3, reference numeral 12 is a handle for vertically moving the sucker device, and 13 is a fixing screw for fixing the sucker device. Furthermore, a plurality of air adjusting knobs 14 are provided on the sucker frame 5 side.

With such a configuration, when the paper is fed, air is blown horizontally from the rear side to some of the papers 3 in the upper layer of the stacked papers 3 from the nozzles of the separating paper 9 so that the papers 3 Since the first sheet of paper 3 and the second and subsequent sheets of paper 3 are separated, the blow foot 7 holding the trailing edge of the first sheet of paper 3 advances and retreats. Since air is blown while pressing the second and subsequent sheets of paper 3, the second and subsequent sheets of paper 3 are separated so as not to follow the first sheet of paper 3. Further, since the paper pressing weight 10 presses the second and subsequent sheets of paper 3, the separation of the paper 3 is further improved.

At the same time as this operation, the first suction port 6 descends, sucks the first sheet of paper 3 and ascends, moves forward, and then the intake to the first suction port 6 is cut off and the second suction port 6 is stopped. Since the intake air acts on 8, the paper 3 is sucked from the first suction port 6 to the second suction port 8.

Next, the second suction port 8 advances to convey the paper 3, and the leading end of the paper 3 is caught by the paper feed roller and the paper feed roller which are rotating in contact with each other, so that the paper 3 is It is sent out on the feeder board. The fed-out paper 3 is conveyed toward the difference plate on the feeder board, the paper positions are aligned by the register device, and then supplied to the printing unit for printing.

[0010]

[Problems to be solved by the device]

 However, in such a conventional paper feeding device, the operator determines the height position of the air blow to see the change in the upper end surface of the stacking paper 3 with respect to the change in the upper end surface of the stacking paper 3 that occurs during printing. However, not only does this impose a heavy burden on the operator, but failure to make this adjustment may result in poor paper feed, resulting in poor print quality and an increased amount of wasted paper. There was a problem.

In addition, the upper end surface of the stack of papers 3 is not always flat during printing, and one end of the upper end surface may become lower or higher. Since it is not possible to adapt the position of the member to this, not only does the paper feed failure occur and the print quality deteriorates and the amount of waste paper increases, but also the printing operation must be interrupted. There is a problem that the operating rate of the machine is reduced.

The present invention has been made in view of the above points, and enables the air blowing nozzle and the paper retainer to always occupy the best positions regardless of changes in the state of the paper. An object of the present invention is to provide a sheet feeding device for a sheet-fed printing press.

[0013]

[Means for Solving the Problems]

 In order to achieve such an object, in the present invention, an air blowing member that blows air onto a plurality of upper layers of paper stacked on a paper stack from a direction substantially orthogonal to the thickness direction of the upper and lower parts is used. It is supported by a paper retainer weight side that is movably supported in the direction and presses the upper surface of the paper.

[0014]

[Action]

 During the printing operation, the air ejected from the nozzle of the air blowing member separates the upper layers of the paper stacked on the paper stack, and when the suction port sucks the first paper, Since the paper is pressed by the paper presser weight, the first paper and the second and subsequent papers are not separated, and the second and subsequent papers are not sucked. In this case, since the air blowing member is supported on the paper holding weight side, even if the specifications of the paper change or the upper end surface of the paper is inclined during printing, the air blowing member and paper holding weight will be The position does not change, the paper is securely separated, and paper feeding does not occur.

[0015]

1 to 4 show an embodiment of a sheet feeding device according to the present invention, FIG. 1 is a front view of the sheet feeding device, FIG. 2 is an enlarged sectional view taken along line II-II of FIG. 1, and FIG. 2 is a front view as seen from III, and FIG. 4 is a sectional view taken along line IV-IV of FIG. In the figure, a not-shown stay 21 for connecting left and right sheet feeding frames is supported by a sheet feeding device 20, and a sacker frame 23 of a sucker device 22 is fixed to the stay 21 by means of an L. It is movably supported in the up-down direction and the front-rear direction via a V-shaped bracket 24.

Below the sucker device 22, a paper stacking base (not shown) which can be raised and lowered is arranged, and paper 25 is stacked on a paper stacking plate (not shown) placed on the paper stacking base. ing. On the lower end surface of the sucker frame 23, a plurality of vertically movable first suction ports (not shown) connected to the suction port of an air pump (not shown) by air hoses are supported in parallel in the width direction of the paper 25. These first suction ports are configured to suck and convey the papers 25 one by one by vertical movement and intake.

In front of the first suction port (not shown), four second suction ports 27 that are vertically movable and movable back and forth are connected to the suction port of an air pump (not shown) with an air hose, and are arranged in the width direction of the paper 25. In contrast, the paper 25 is located outside the first suction port and is supported in parallel with the width direction of the paper 25 by the sucker frame 23, so that the paper 25 sucked from the first suction port is moved by vertical movement and intake. Is configured. A sensor is provided in the vicinity of the upper end surface of the paper 25, and the upper end surface of the paper 25, which is reduced due to the feeding, is detected by a blow foot 28, which will be described later, and a signal is emitted to intermittently move the paper tray. It is configured to be automatically raised to hold the upper end surface of the paper 25 at a certain level.

Reference numeral 28 denotes a blower foot that is positioned between the paper retainers 26 and is swingably supported on the sucker frame 23 side, and is connected to an exhaust port of an air pump (not shown) by an air hose. Moves forward and backward with respect to the upper end surface of the paper 25, presses and releases the upper end surface of the paper 25, and at the time of pressing, air is blown to the first paper 25 and the second paper. It is configured to separate the following paper. Further, the blowing foot 28 has a function of detecting the height of the stacked paper 3.

Further, between the inner first suction port (not shown) and the first outer suction port (not shown), a pair of left and right blades 30 connected to the exhaust port of an air pump (not shown) by an air hose are provided on the sucker frame 23 side. It is provided so as to be supported by a support shaft 29 of the paper stack 25, and is configured to blow air from a rear side, which is a direction substantially orthogonal to the thickness direction of the paper 25, to several sheets of the upper layer of the stacked paper 25 so as to separate the paper 25. ing.

Next, the paper separating member according to the present invention will be described. The support shaft 29 supported by the lower end surface of the sucker frame 23 extends horizontally to the left and right, and a pair of left and right paper sheets indicated by reference numeral 31 at the left and right extension ends thereof. The separating device is provided by fitting the holder 32 at the upper end portion so as to be movable in the left-right direction. Reference numeral 33 is a fixing screw for fixing the paper separating device 31 at the moved position.

A vertical guide pin 34 is fitted into and supported by an upper end of a vertical hole provided at an end of the holder 32 on the side of the fixing screw 33, and is fixed by a knock pin 35. The paper guide 36, which is formed in an inverted L shape and has a vertical surface abutting on the rear end side surface of the paper 25, is supported by a snap ring 43 so that the paper guide 36 can be moved up and down.

An elongated hole 36 a is formed in the vertical member of the paper guide 36, and an inverted L-shaped paper retainer weight 37 is formed in the elongated hole 36 a so that the vertical face of the paper 25 is formed. The paper pressing weight 37 is attached to the rear end side surface so as to be movable up and down. The paper pressing weight 37 is pressed against the rear end of the upper end surface of the paper 25 by its own weight and presses it. Further, the paper pressing weight 37 is prevented from coming off by a plate 39 fixed by a set screw 38.

Further, a screw portion 41a of an adjusting cock 41, which is connected to the air pump (not shown) by an air hose 40, is screwed into a screw hole 37a provided in a vertical member of the paper presser weight 37. The adjusting cock 41 has a plurality of air nozzles 42 communicating with the air hose 40, with the air discharge holes directed toward the upper layer of the paper 25. In addition to blowing air to separate the paper 25, the amount of discharged air is controlled by the rotation of the cock.

The operation of the sheet feeding device configured as described above will be described. When the paper 25 is stacked on the paper stack plate on the paper stack and the paper stack is raised, the paper stack stops at a predetermined height. Therefore, the fixing screw 33 is loosened, and the entire paper separating device 31 is moved to a position suitable for separating the paper, and the fixing screw 33 is tightened. At this time, the paper pressing weight 37 is pressed against the rear end of the upper end surface of the paper 25 by its own weight and presses the paper 25. Further, the blowing foot 28 enters above the rear end portion of the paper 25 and presses the paper 25, and the separation 30 directs the air ejection holes to the rear end side surface of the upper layer portion of the paper 25 to blow air. ..

When the printing operation is started after the preparation as described above, the first suction port (not shown) moves up and down and the intake air acts on the first suction port, so that the first suction port sucks the first sheet 25 and moves up. At this time, the rising paper 25 rises while flipping up the paper pressing weight 37 at its rear edge, and after the first paper 25 is lifted, the paper pressing weight 37 is pressed against the second paper 25 by its own weight. To be done. Since the paper pressing weight 37 is supported by the long hole 36a, the paper pressing weight 37 will not be damaged even if it is pushed up by the rising paper 25 or the like. Further, since the blow foot 28 is retracted from the paper 25 by swinging, there is no problem in raising the paper 25.

Further, when the first sheet of paper 25 is sucked and raised by the first suction port, air is ejected from the separating device 30 and air is ejected from the air nozzle 42 of the paper separating device 31 so that several sheets of the upper layer portion are ejected. Since the first sheet of paper 25 is separated from the second sheet of paper 25 by separating the first sheet of paper 25, the second sheet of paper 25 or less follows the first sheet of paper 25 and sucks. Never be done.

During such a printing operation, the state of the upper end surface of the paper 25 changes from moment to moment, but the relative position between the air nozzle 42 and the paper presser weight 37 does not always change, and if the paper presser weight 37 moves up and down. As the air nozzle 42 also moves up and down by the same amount, it is possible to always separate the paper 25 at a fixed position.

The suction from the first suction port to the second suction port 27 and the subsequent operation are the same as in the conventional case, and therefore the description thereof is omitted.

In this embodiment, since the paper guide 36 is supported by the guide pins 34 so as to be vertically movable, even if the paper 25 pushes up the paper guide 36 when the paper size is changed, the paper guide 36 Is safe because it does not contact the holder 32.

Further, in the present embodiment, an example in which the screw portion 41a of the adjusting cock 41 is screwed into the screw hole 37a of the paper presser weight 37 and the air nozzle 42 is provided in this is shown, but the air nozzle is provided on the paper presser weight side. It is sufficient to provide the paper pressing weight and the adjusting cock integrally with each other, and the air nozzle may be provided on the side portion thereof.

Further, in the present embodiment, the example in which the air nozzle 42 is provided on the rear side of the stacked paper sheet 25 is shown, but if the direction is substantially orthogonal to the thickness direction of the stacked paper sheet 25, it is the width direction of the stacked paper sheet 25. It may be provided laterally.

[0032]

[Effect of device]

 As is clear from the above description, according to the present invention, in the sheet feeding device of the sheet-fed printing press, the air is applied to the upper layers of the sheets stacked on the stack from the direction substantially orthogonal to the thickness direction. The upper end surface of the paper stacked on the paper stacking board is supported by supporting the air blowing member that blows the paper on the paper pressing weight side that is supported movably in the vertical direction and presses the upper surface of the paper with. Even if conditions such as paper size and paper thickness change, the relative position between the air blowing member and the paper presser weight does not change, and the paper blowing position by the air blowing member can always be set to the optimum position. Since the amount of defects generated can be minimized, the print quality is improved, the amount of waste paper is reduced, and the interruption of printing operations due to defective paper feed is eliminated, increasing the operating rate of the machine. .

[Brief description of drawings]

FIG. 1 is a front view of a sheet feeding device.

FIG. 2 is an enlarged sectional view taken along line II-II of FIG.

FIG. 3 is a front view taken along line III of FIG.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a front view of a sheet feeding device of a conventional sheet-fed printing press.

[Explanation of symbols]

 20 Paper Feeding Device 25 Paper 31 Paper Separation Device 33 Fixing Screw 34 Guide Pin 36 Paper Guide 37 Paper Presser Weight 37a Screw Hole 41 Adjustment Cock 42 Air Nozzle

Claims (1)

[Scope of utility model registration request] 1. An air blowing member that blows air onto a plurality of upper layers of paper stacked on a paper stack from a direction substantially orthogonal to the thickness direction of the paper to support the air blowing member so as to be vertically movable. A sheet feeding device for a sheet-fed printing press, which is supported by a paper pressing weight side that presses the upper surface of the paper.