JP2562968Y2 - Feeding air blower for sheet-fed printing press - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a sheet-fed printing press in which a sheet is loaded on a paper stack and separated by blowing air between the paper sucked one by one at a suction port of a sucker unit. The present invention relates to an air blowing device.

[0002]

2. Description of the Related Art In a paper feeder of a sheet-fed printing press, paper loaded on a paper platform is sucked by a pair of left and right suction ports provided in a sucker device, and is then captured by a paper feed roller and fed to a feeder. The paper is sent out onto the board. In this case, it is necessary to suck the paper by the suction port exactly one sheet at a time. An air wiping device of this type is conventionally known as a blow-foot type and a nozzle type.

[0003] Among them, the air blowing device of the blowing type is provided with a blowing foot as an air blowing member which also serves as a paper holding member for pressing a rear end edge of the paper stacked on the paper stacking table from above. At this time, the blowing foot holding the trailing edge of the first sheet of paper retreats, and almost simultaneously with the operation, the suction port sucks the first sheet of paper . After that, the blowing foot returns and holds the second sheet of paper
However, at this time, the first sheet and the second and subsequent sheets are separated by blowing air horizontally from the blowing foot along the second sheet. .

A nozzle type air blowing device is provided with a pair of left and right nozzles provided above a trailing edge of a stack of paper, and is located between these nozzles and supported coaxially with the nozzles. And a pair of left and right air blowing members. At the time of paper feeding, air is blown horizontally from the rear to some of the upper layers of the stacked paper from the separation, so that the first paper and the second and subsequent papers are separated, and one suction port is provided. Suction the eye paper. An air layer is formed between the first and second sheets of paper by horizontally blowing air from the nozzles between the first and second sheets of paper. It is configured to stabilize the paper transport on the feeder board.

[0005]

However, among the conventional air blowing devices of the paper feeder, in the blowing type air blowing device, it is structurally difficult to blow air over the entire surface of the paper. Since the air from the paper is blown in a fan shape from the center in the width direction of the paper, there is a problem that sufficient separation of the paper cannot be expected. Also, since the blowing foot is fixed in the vertical direction in order to retain the function of the paper presser, the air blowing height of the blowing foot cannot be adjusted, and the best air blowing state cannot be obtained. is there.

Further, in the nozzle type air blowing device, even if an attempt is made to position the nozzle behind the suction port, which is the optimum position for blowing air, the rear of the suction port is optimal for removing paper. The nozzle cannot be provided here because there is a judgment that the nozzle is located at the position, and the nozzle is unavoidably provided at a position displaced from the rear of the suction port. There is a problem that air cannot be satisfactorily blown between the following paper and paper conveyance is not stable.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and provides a sheet feeding air blowing device for a sheet-fed printing press which enables the nozzle and the separation of the air blowing device to occupy the best positions. It is intended to be.

[0008]

A nozzle for blowing air below the paper sucked by the suction port is positioned immediately behind the suction port, and air is blown from behind to a plurality of upper layers of the paper loaded on the paper stacking table. The airbag was positioned directly below this nozzle.

[0009]

[Function] During the printing operation, air blown out of the
When a plurality of upper layers of the paper stacked on the paper stacker are separated at the rear end and the suction port sucks the first paper, the paper is moved between the first paper and the second or less paper. Since air is blown from the nozzle to separate the paper, the suction port surely sucks only one sheet to feed the paper. In this case, since the separator and the nozzle are positioned vertically and immediately behind the suction port, the paper is reliably sucked one by one, and stable paper conveyance is obtained.

[0010]

1 to 4 show an embodiment of a paper feeding air blowing device according to the present invention, FIG. 1 is a side view of the paper feeding air blowing device, FIG. 2 is a plan view thereof, and FIG. 3 is a front view thereof. FIG. 4 is a front view as viewed from IV in FIG. In the drawing, a sucker frame 1 which is positioned at the center in the width direction of the sheet feeding device and supported on the machine base side and has a rectangular shape in side view is connected to a suction air source and a pair of left and right suction ports 2 forming a sucker device. Is supported so as to be swingable about the upper end portion and movable in the paper transport direction. Under the sucker device, the paper 3 is stacked on a paper stack driven up and down by a driving device. I have. And mouthpiece 2
Is configured to suck and swing the paper 3 one by one by lifting and lowering, and to transport the paper 3 onto a feeder board (not shown) by swinging in the paper transport direction. Reference numeral 4 denotes a paper presser having a sensor function of causing the lower end surface to contact the upper end surface of the paper 3, detecting the detected upper end surface, and automatically lowering the stacking platform via the control device.

A bracket support shaft 5 is fixedly mounted on a protruding piece 1a formed at the lower end of the rear end of the sucker frame 1 so as to extend horizontally. The bracket support shaft 5 has a vertical shaft hole. A pair of left and right brackets 6 having 6a are bolted so as to be movable. A screw shaft 7 is fitted and supported in the shaft holes 6a of the left and right brackets 6 so as to be vertically adjustable, and an adjustment knob 8 is screwed into the upper end screw portion 7a. The rotation of the screw shaft 7 is regulated by a screw 7c engaged in the groove 7b. At the lower end of each screw shaft 7, 1
A nozzle 9 having a flat nozzle hole 9a directed downwardly of the sheet 3 is supported by being connected to an air source (not shown) by a hose 10, and air is sucked by the suction port 2. The air layer is formed by blowing between the eye paper 3 and the second or lower paper 3. The nozzle 9 is supported at a position immediately behind each suction port 2.

At the lower part of each screw shaft 7, a judgment holder 11 is provided.
Are fitted so as to be movable up and down.
At the lower end portion of the airbag, a horizontal judge 12 is supported by being connected to an air source by a hose 13.
Numeral 2 designates a plurality of air ejection holes 12a directed to rear edges of a plurality of upper layers of the stacking paper 3. The pair of left and right discarders 12 are disposed immediately behind the respective suction ports 2 and directly below the nozzles 9, and by rotating a knob 13 screwed to the threaded portion of the screw shaft 7, It is configured to be adjusted up and down. 14 is the upper and lower washers 15,1
This is a compression coil spring that is interposed between 6 and urges the separating holder 11 downward. The separating holder 11 is provided with a long hole 11a into which the nozzle 9 is engaged. 17
In order to prevent a plurality of sheets of paper 3 from being sucked by the suction port 2, the second and subsequent sheets 3 are repelled.

The operation of the air blowing device configured as described above will be described. When the printing operation is started after the paper 3 is stacked on the paper stacking board, the air ejected from the air ejection holes 12a of the separator 12 is blown from behind to the plurality of upper layers of the stacking paper 3. Will be judged. The mouthpiece 2 swings there and moves up and down.
, But at this time, the first paper 3 and the second paper 3
Air is blown out from the nozzle hole 9a of the nozzle 9 between the first paper 3 and the second paper sucked by the suction port 2 to form an air layer. In this case, since the nozzle 9 and the separator 12 are both disposed immediately above and below the mouthpiece 2, the paper 3 is reliably separated. The paper 3 sucked by the suction port 2 is sent onto the feeder board by the swing of the suction port 2 and the swing in the paper transport direction.

When the knob 8 is rotated, the screw shaft 7 moves forward and backward, the nozzle 9 and the judgment unit 12 are integrally moved up and down, and the knob 13 is fixed by hand and the knob 8 is moved. The height of only the nozzle 9 can be adjusted by rotating the knob 9, and the height of only the discard 12 can be adjusted by rotating the knob 13. When the knobs 8 and 13 are rotated, the screw shaft 7 does not rotate because the screw 7c is engaged with the groove 7b. By moving the bracket 6 on the bracket support shaft 4, the nozzle 9 and the discriminator 1 are moved.
2 can be integrally moved and adjusted in the left-right direction.

In the present embodiment, a sucker device in which a pair of left and right suction holes for sucking paper swing and move in the paper transport direction is illustrated. However, the present invention is not limited to this. The device is constituted by a first suction port swingably supported around an upper end portion, and a pair of left and right second suction ports provided in front of the suction port. The same effect can be obtained even when the sucked paper is sucked and replaced by the second suction opening.

[0016]

As is apparent from the above description, according to the present invention, in the sheet feeding air blowing device of a sheet-fed printing press, a nozzle for blowing air below the paper sucked by the suction port is provided.
Together is positioned directly behind the desert separating by blowing air from the rear at the top a plurality of paper stacked on the Kamiseki stand, by which is positioned just below the nozzle, the nozzle and judgment are both sucker Because it is arranged right behind,
Separation of the first sheet sucked by the suction opening from the second sheet or less is ensured, and the two sheets are not sucked at the same time, so that the air blowing function is improved and the conveyance of the sheet is stabilized. In addition, the air blown from the nozzles performs the judgment on the second and subsequent sheets of paper, and since the position is the same as the position of the judgment, the separation efficiency for the next sucked paper is increased, and the air is blown. The function of the blowing device is further improved.

[Brief description of the drawings]

FIG. 1 is a side view of a sheet feeding air blowing device.

FIG. 2 is a plan view of a sheet feeding air blowing device.

FIG. 3 is a front view of a sheet feeding air blowing device.

FIG. 4 is a front view as viewed from IV in FIG. 1;

[Explanation of symbols]

 2 Suction 3 Paper 5 Bracket support shaft 6 Bracket 7 Screw shaft 8 Knob 9 Nozzle 11 Judgment holder 12 Judgment 13 Knob

Claims (1)

(57) [Scope of request for utility model registration] 1. A sheet-fed printing press provided with a blower for blowing air from behind onto a plurality of upper layers of paper stacked on a paper stacker, and a nozzle for blowing air below the paper sucked by a suction port. Wherein the nozzle is located immediately behind the suction port and the discriminator is located immediately below the nozzle.