JPH0235699Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a sheet-fed rotary printing machine in which the stacking position of the paper stacked on the paper stacking table of the paper feeding device is adjusted so that the paper is correctly fed to the printing unit. The present invention relates to a paper position detection device that detects and issues a correction signal for the paper stack position.

[Conventional technology]

In printing work using a sheet-fed printing press, the paper stacked on the paper stacking table of the paper feeder via a pallet is
The suction device sucks the sheets one by one from the upper layer, sends them out onto the insert plate, and after adjusting the vertical and horizontal positions with the front plate and horizontal needle device, one sheet at a time is sucked into the mouth with the claw of the swing device. and supplied to the printing unit. Printing is then performed on this paper by transferring the image formed on the plate surface on the printing cylinder either directly or via a blanket cylinder.

In order to supply paper to the paper feeding device in such printing operations, the general method is to scoop up a pallet loaded with paper with a fork of a forklift, transport it, place it on a paper stacking table, and then remove the fork. It is taken. If the paper on the pallet placed on the paper stacking table is misaligned in the left-right direction, it may collide with the cross-stitching device when it is fed onto the differential plate, or the paper may be pulled in by the cross-stitching device. Since a lot of paper will be wasted if the paper goes out of range, it is necessary to accurately place the pallet loaded with paper on the paper stacking table.

In addition, in recent years, automation of printing work has been developed, and paper stored in a warehouse is supplied to a paper feeder by a conveyor via a paper aligner, and when back printing is performed again after printing, this back printing Since the paper is reversed from the paper discharge device of the printing machine and fed to the paper feed device by a conveyor via a paper aligner, it is necessary to accurately feed the paper onto the paper stacking table in this case as well.

Conventionally, a paper stacking table on which a pallet is placed is provided so as to be movable in the paper width direction, and a detection sensor is provided above the widthwise edge of the paper stacked on the pallet to detect the position of the paper. , a signal is issued to move the paper stacking table to the correct position.

[Problem that the invention attempts to solve]

However, in such conventional paper position detection devices, the stacking height of paper is not always constant due to paper curls, etc., resulting in uneven detection accuracy. Sometimes it was not detected at all. In addition, since the edge of the paper is directly detected, not only does the detection accuracy decrease due to incorrect detection of the markings for printing quality control provided on the edge of the paper, but also the Because the distance between the paper and the detection section was small, there was a risk of damaging the paper or wearing out the detection sensor.

[Means for solving problems]

In order to solve these problems, the present invention includes a pair of detector holders that are moved in the paper width direction by motors on holder spindles supported by a frame, and a A paper guide pin is provided and supported to move forward and backward relative to the side edge of the stacked paper; a paper guide fixed to the paper guide pin and having a vertical surface that contacts the side edge of the stacked paper; A detection piece is provided integrally with the paper guide, and the movement position of the detection piece that moves laterally against the urging force of the spring is detected. The detector was installed near the position of the paper guide pin on the detector holder.

[Effect]

When the paper is loaded onto the paper stacking table with the detector and the paper guide moved outward by the driving means and the detector and the paper guide are moved inward by the motor, the paper guide is first moved by the spring member. It is pressed against the side edge of the stacked paper. Furthermore, if only the detector is advanced by the motor and stopped at the reference position, the detector will detect the detected piece of the paper guide from then on, and if there is an error in the paper stacking position, it will issue a signal and move the paper stacking table to the correct position. Move to.

〔Example〕

1 to 4 show an embodiment of the paper position detection device according to the present invention, FIG. 1 is a partially cutaway front view thereof, FIG. 2 is a partially cutaway enlarged front view of the vicinity of the detector, and FIG. FIG. 3 is a schematic front view showing the detection sections on both sides, and FIG. 4 is a front view of the vicinity of the detection section shown to explain the detection operation. In the figure, the paper feeding device of the printing press is equipped with a paper stacking table (not shown) that can be moved and adjusted in the paper width direction, which is the horizontal direction in the figure. Paper 1 stacked on a pallet is supplied. Above this paper 1, a holder support shaft 2 parallel to its upper end surface is supported with both ends fixed by splitting brackets 3 fixed to the left and right frames.
Further, below the holder support shaft 2, a screw shaft 4 parallel to the holder support shaft 2 is rotatably supported at both ends by a boss portion of a bracket 3 via a bush 5.
Reference numeral 6 denotes a motor fixed to one frame, and a gear 8 mounted on a motor shaft 7 meshes with a gear 9 mounted on a screw shaft 4. By rotating the motor 6, the screw is rotated. As the shaft 4 rotates, the motor 6 is configured to rotate by an amount set by the operator according to the size of the paper 1 and then stop. Reference numeral 10 denotes a thrust bearing which is interposed between the bracket 3 and the gear 9 as well as between the opposite bracket and the collar (not shown) to restrict the movement of the screw shaft 4 in the axial direction while alleviating the thrust force. In addition, 11 is a half-split female threaded portion 11
A is a detector holder which is supported by a holder support shaft 2 so as to be freely advanced and retractable by screwing the screw shaft 4 into the screw shaft 4.
It is configured to move forward and backward along the holder support shaft 2 and the screw shaft 4 by rotation of the holder. Detector holder 1
1 is integrally formed with a holder bar 11b that hangs down from the female threaded portion 11a toward the outside of the side edge of the paper 1, and a paper guide pin 12 is inserted into the pin hole at the lower end of the holder bar 11b. The paper guide pin 12 is supported so as to be able to move forward and backward in the direction toward and away from the edge.
Rotation is restricted by engaging a key groove 16 with a key portion 15 at the tip of a screw screwed into the holder bar 11b and fixed with a nut 13. A paper guide 17 is fixed to the tip of the paper guide pin 12, and has a vertical surface 17a facing the side edge of the paper 1.
The compression coil spring 18 is formed in an inverted L shape so as to have an upper end horizontal surface 17b that functions as a detection target piece, and is interposed on the paper guide pin 12.
The vertical surface 17a is urged in a direction to press against the side edge of the paper 1. Furthermore, holder bar 11
b, an L-shaped holder 19 has a pair of detection sensors 20A and 20 attached to its lower surface.
B is fixed close to above the upper end horizontal surface 17b of the paper guide 17, and the detection sensors 20A, 20
B is connected to the control device by a lead wire 21. When the pair of detection sensors 20A and 20B detect that both of them overlap the upper end horizontal surface 17b of the paper guide 17, they emit a signal to move the paper stacking table in the direction in which the paper 1 moves to the right in the figure. When both detection sensors 20A and 20B come off the upper end horizontal surface 17b of the paper guide 17 and no longer detect this, a signal is issued to move the paper 1 to the left in the figure. move in the direction. As a result of these movements, when the tip of the upper end horizontal surface 17b comes to the middle of both detection sensors 20A and 20B as shown in FIG. 1, the movement stops. In this state, the paper stacking table does not move. 22 is a collar fixed to the tip of the paper guide pin 12, and when the holder bar 11b is moved to the left in FIG.
After reaching the collar 22, the paper guide 17 moves together with the detection sensors 20A and 20B. As shown in Fig. 3, the detection device configured as described above is also installed on the right side when facing the front side, and only on one side, such as on the left side for front printing and on the right side for back printing. is used in correspondence with the horizontal needle device. In addition,
Drive units such as the motor 6 are also provided separately on the left and right sides. In this case, the holder spindle 2 is attached to the left and right brackets 3.
The screw shaft 4 is fixedly supported in between, but the screw shaft 4 is divided into a right side and a left side at the middle part.

The operation of the paper position detection device configured as described above will be described with respect to the case where the left detection device is used. Before feeding paper 1 to the paper feeder,
Rotate the motors 6 on both sides to remove the holder bars 1 on both sides.
When 1b is moved outward greatly, the holder bar 1
1b comes into contact with the collar 22, the paper guides 17 move outward, and the distance between the paper guides 17 on both sides is widened. Then, the paper 1 stacked on a pallet is fed onto a paper stacking table using a forklift or a conveyor. At this time, since the paper guide 17 is opened outward, the paper 1 and the paper guide 17 do not cross each other.
Therefore, the right paper guide 17 is brought into pressure contact with the side edge of the paper 1 by the right motor according to the paper size. From now on, the detection device on the right will not be used.

Next, when the motor 6 on the left side is instructed to rotate according to the paper size, the motor 6 rotates as instructed, the screw shaft 4 rotates via the gears 8 and 9, the detector holder 11 moves, and the detection sensor 20A, 20B moves to the set reference position. In this case, after the holder bar 11b leaves the collar 22, the paper guide 17 is brought into contact with the side edge of the paper 1 by the elastic force of the compression coil spring 18 prior to the movement of the detection sensors 20A, 20B. Then, the detection sensors 20A and 20B that followed the paper guide 17
7b, but in this case, if only the detection sensor 20B of the detection sensors 20A and 20B that stopped at the reference position overlaps with the upper end horizontal surface 17b of the paper guide 17, this is not the case when the paper stacking position is correct. The paper stacking table does not move because the signal is not emitted.

However, as shown in FIG. 4a, the detection sensor 20
If both 20A and 20B are off the upper end horizontal surface 17b of the paper guide 17 when they stop at the reference position, a signal is issued to move the paper stacking table to the left in the figure, and the fourth As shown in Figure b, the ends of the upper horizontal surface 17b are connected to both sensors 20A and 20B.
Sensors 20A and 20B issue a correction completion signal when the paper is in the middle, the movement of the paper stacking table stops, and paper 1
is positioned correctly.

In addition, as shown in FIG. 4c, the detection sensor 20
If both 20A and 20B overlap the upper end horizontal surface 17b of the paper guide 17 when A and 20B stop at the reference position, a signal is issued to move the paper stacking table to the right in the figure, and As shown in Figure 4(d), the ends of the upper horizontal surface 17b are connected to both sensors 20A and 20B.
Sensors 20A and 20B issue a correction completion signal when the paper is in the middle, the movement of the paper stacking table stops, and paper 1
is positioned correctly.

Paper 1 loaded in the correct position in this way
are sucked one by one from the upper layer by a suction device and sent onto the differential plate. A horizontal needle device is installed at the tip of the difference plate, and the upper and lower rotating rollers pull the side edges of the paper into the gauge to align the left and right register, but the paper cannot be stacked correctly in the paper feeder. This prevents the edge of the paper from colliding with the cross-stitch device or leaving the retracting range of the cross-stitch device. After that, if paper feeding continues, the paper 1 on the pallet may collapse so that the side edge is inclined, but in this case, the paper guide 17 is moved by the collapsed paper 1, and both sensors 20A , 20B are both upper end horizontal plane 1
Since the paper 1 overlaps or deviates from the paper 7b, the paper 1 continues to be fed while the position of the paper 1 is automatically corrected.

In this device, as is clear from FIG. 3, the vertical surface 17a of the paper guide 17 on the right side is also pressed against the side edge of the paper 1 by the compression coil spring 18, and the paper 1 is urged by the spring pressure. Since the paper 1 is held between the paper guides 17 on both sides, even if the paper 1 is slightly uneven in the left-right direction, it can be corrected.

[Effect of idea]

As is clear from the above explanation, according to the present invention, in a sheet-fed rotary printing press, a sensor holder is installed at the lower end of a pair of detector holders, each of which moves in the paper width direction by the drive of a motor, against the side edge of the stacked paper. A paper guide is provided that is supported to move forward and backward and is biased in the same direction, and a detection piece is integrally provided on this paper guide, and a detector for detecting the movement position of this detection piece is installed at the paper guide installation position. Because it is installed nearby, the detection unit does not directly detect the edge of the paper, which not only reduces the amount of paper waste because it does not damage the paper surface, but also reduces detection accuracy due to incorrect detection of quality control marks, etc. In addition to eliminating the drop, there is no contact between the detector and the paper, which reduces detector malfunctions due to detector wear and paper dust. Furthermore, even if the stacking height changes due to paper curls, etc., the detection accuracy will not deteriorate, and even if the paper is uneven in the left-right direction, it will be corrected with high accuracy. Furthermore, when feeding paper onto the paper stacking table, the paper guide can be retracted outward, allowing for smooth feeding. Since the paper is held in place, slight irregularities in the paper can be corrected.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the paper position detection device according to the present invention, FIG. 1 is a partially cutaway front view thereof, FIG. 2 is a partially cutaway enlarged front view of the vicinity of the detector, and FIG. Figure 3 is a schematic front view showing the detection units on both sides.
FIG. 4 is a front view of the vicinity of the detection section shown for explaining the detection operation. DESCRIPTION OF SYMBOLS 1... Paper, 2... Holder spindle, 3... Bracket, 4... Screw, 6... Motor, 8, 9... Gear, 11... Detector holder, 11a... Female threaded part, 11b... ...Holder bar, 12...Paper guide pin, 17...Paper guide, 17a...Vertical surface, 17
b... Upper end horizontal surface, 18... Compression coil spring, 1
9...Holder, 20A, 20B...Detection sensor.

Claims (1)

[Claims for Utility Model Registration] A pair of detector holders 11 each moving in the paper width direction on a holder support shaft 2 supported by a frame by the drive of a motor 6; A paper guide pin 12 is provided, and is supported to move forward and backward relative to the side edge of the stacked paper 1, and a vertical surface 17a is fixed to the paper guide pin 12 and is in contact with the side edge of the stacked paper 1. It is equipped with a paper guide 17 and a spring 18 that biases the paper guide 17 in the direction of stacked paper, and a detection target piece 17b is integrally provided on the paper guide 17, and the paper guide 17 is provided with a detection target piece 17b, and the detection target piece 17b is attached to the side against the biasing force of the spring 18. The detectors 20A and 20B, which detect the moving position of the detected piece 17b moving in the direction, are mounted on the detector holder 11.
A paper position detection device for a sheet-fed rotary printing press, characterized in that it is provided near the paper guide pin 12 arrangement position.