JP2596351Y2 - Paper guide device 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 the paper fed from a paper feeder onto a difference plate is held by a holding member of a swing device and is conveyed to a printing cylinder in order to transfer the paper without holding the paper. The present invention relates to a paper guide device for guiding a section.

[0002]

2. Description of the Related Art In a printing operation by a sheet-fed printing press, paper stacked on a paper stack of a paper feeder is sucked and conveyed one by one through a suction port of a sucker, and the conveyed paper is rotated. After being caught by the upper and lower paper feed rollers and the paper feed roller and fed onto the feeder board, the feeder board, which is inclined so as to become lower toward the front, is pinched by multiple transport tape locations. Transported.

[0003] In the front of the feeder board, a differential plate inclined at the same gradient as this is continuously supported on the feeder board, and a gap between the leading end of the differential plate and a printing cylinder of a printing unit, for example, a transfer cylinder, is provided. A swing device having a plurality of swingable arms arranged in parallel in the width direction of the paper and a claw as a holding member supported at the swing end thereof is provided. The swing fulcrum of the arm in the lower swing type swing device is provided below the difference plate.

[0004] With such a configuration, the paper conveyed onto the difference plate is held by the swing of the swinging device and conveyed by the swing of the arm. It is conveyed by the rotation of the body. Thereafter, the image formed on the plate surface on the plate cylinder is transferred directly or via the blanket cylinder to the paper conveyed by repeatedly performing the grip change between the claw of the transfer cylinder and the claw of the impression cylinder. Thus, printing is performed.

In such a printing operation, if the paper supplied to the transfer drum by the swing device is shifted in the vertical or horizontal direction, the printing position on the paper, that is, the so-called printing register is shifted, and the quality of the printed matter deteriorates. Conventionally, a register device for aligning the paper position in the vertical direction and a horizontal needle device for aligning the paper position in the left-right direction are provided at the end of the difference plate because the amount of waste paper increases. .

[0006] Of these, the registration device in the vertical direction is generally constructed as follows. In other words, a plurality of cuts are provided in the front edge of the slide plate in the left-right direction with different phases in the left-right direction from the claws of the swing device. A front pad is fixed to the upper end of each arm fixed to the moving shaft.

[0007] With this configuration, when a plurality of arms stand together by the cam mechanism or the like and the front abutment is engaged with the notch of the differential plate, the arm is fed onto the differential plate as described above. The paper is stopped in a state in which the front end abuts on the front end, so that the paper is registered in the vertical direction. Thereafter, as described above, when the paper held by the claws of the swing device is conveyed, all the front supports are conveyed by the swing device by the plurality of arms swinging together by the rotation of the swing shaft. Since the paper leaves the paper conveyance path to be transported, the paper conveyance is not hindered.

Further, the horizontal needle device is provided with upper and lower rollers which rotate with their peripheral surfaces in contact with each other with the axial direction facing the top and bottom of the paper. When the paper passes between these upper and lower rotating rollers, the paper is drawn in by the upper and lower rollers, and the paper is positioned in the left-right direction by contacting the gauge provided here. Abut. Note that the horizontal needle devices are provided on both the left and right sides with respect to the paper transport path. During normal printing, only one of them is used, but after printing, the stacked paper is inverted to feed the paper. When the reverse printing is carried out after the supply, the opposite side needle device is used.

[0009]

However, in such a conventional apparatus, the paper conveyed while being held by the claws of the swinging device is not held at a portion other than the holding portion, so that the paper is not transferred to the transfer drum. After the delivery of the paper, return to the direction of the disc.The swinging device's claws and arms push the air away from the turbulence of the air. Not only do
There is a problem that the non-holding portion of the paper is pressed against the sharp end of the difference plate by the wind pressure and breaks.

Therefore, the present applicant has proposed that a guide plate be provided in a conveying path of the paper conveyed by being held by the claws of the swing device so that the hanging part of the conveying paper is slid in contact with the paper.
However, even in this case, depending on the size of the paper, the front support may coincide with the widthwise end of the paper, and when the front support falls down and retreats, the width of the paper is reduced. The end of the paper in the direction is not held, the unheld part hangs down, the nail of the transfer cylinder and the paper may shift up and down, the paper may not be held by the nail, and the corner of the paper may be broken. In addition, there is a problem that the amount of waste paper increases due to the occurrence of so-called corner bending. In particular, in the case of thin paper, these paper feeding defects often occur.

Conventionally, when the above-described paper feeding failure occurs, the printing plate or paper is moved to the left or right, the position of the pawl and the paper edge is adjusted, or the paper edge is curled upward. However, since the adjustment work requires a great deal of labor and a long time, there is a problem that the burden on the operator increases, the preparation time is extended, and the operation rate of the printing press is reduced.

The present invention has been made in view of the above points, and it is possible to smoothly switch the paper from the pawl of the swing device to the pawl of the printing cylinder regardless of the size of the paper. It is an object to provide a paper guide device for a leaf printing press.

[0013]

According to the present invention, in order to achieve such an object, a register for contacting the leading edge of the paper fed onto the disc and registering the register is provided. A sheet-fed printing press having a holding member for holding the leading end of the aligned paper and a swing device for conveying the paper held by the holding member and transferring the paper to a printing cylinder; A guide member for guiding the paper to be conveyed, and the guide member provided on the guide member is positioned at a position corresponding to the front contact in the axial direction of the printing cylinder.
And was arranged so as to face the printing cylinder side of the front.

[0014]

When the front contact is engaged with the notch of the disc by a cam mechanism or the like, the paper fed onto the disc is stopped with the front end in contact with the front cover, so that the paper is turned upside down. Aligned. Next, the paper is held by the holding member of the swing device, and when the arm of the swing device swings, the paper held by the holding member is conveyed and passed to the printing cylinder. In this case, depending on the size of the paper, the widthwise end of the paper coincides with the front end, and a non-holding portion is formed at the widthwise end of the paper, but in the present invention, the front end has retreated from the paper conveyance path. Later, since both ends of the paper are supported by the guide members, both ends of the paper are reliably delivered to the printing cylinder, and the paper is not damaged or wrinkled.

[0015]

1 to 6 show an embodiment of a paper guide device of a sheet-fed printing press according to the present invention. FIG. 1 is a front view showing the vicinity of a swing device in which the paper guide device is implemented, and FIG. FIG. 3 is a plan view showing the left half of the vicinity of the front end of the differential plate in which the present invention is implemented, FIG. 4 is a plan view of the guide plate, FIG. 5 is a front view of the guide plate, and FIG. It is a top view of the guide plate formed in reverse to what is shown. In FIG. 3, the symbol S indicates the machine center line, and the left half and the right half of the difference plate, the front plate, and the like have almost the same configuration with respect to the machine center line S. Shows only the left half.

In the figure, a printing unit of a printing press includes:
A transfer drum 1 is pivotally supported, and a plurality of sets of grippers which are provided with a claw 2 and a claw base 3 and are opened and closed by an opening and closing drive device (not shown) are provided in a notch 1 a provided on an outer peripheral portion of the transfer drum 1. Device 4
(Hereinafter referred to as claws 4) are provided in parallel in the axial direction of the transfer drum 1.

A feeder board 5 and a difference plate 6 which are inclined at the same gradient are connected between a transfer cylinder 1 and a sheet feeding device (not shown) by a connecting plate 7 and supported between left and right frames. I have. Reference numeral 8 denotes a pair of left and right brackets connected by stays 9, the upper end of which is fixed to the difference plate 6, and the lower end of which is supported by a support member (not shown) provided on the frame side.

A bearing shaft 10 provided on the left and right brackets 8 is supported by a cam shaft (not shown) that pivots a predetermined angle in the forward and reverse directions. A plurality of front supports 14 having a U-shape in a plan view are fixed to the free ends of these front support arms 12, respectively.

With this arrangement, when the abutment shaft 11 is driven by a cam mechanism (not shown) and the front abutment arm 12 is rotated by a predetermined angle in the forward and reverse directions, the front abutment 14 is displaced as shown by a solid line in FIG. It is configured to move between a paper contact position where the paper 15 fed onto the plate 6 abuts and a retreat position where the paper 15 retreats obliquely downward from the paper contact position as shown by a chain line. The front contact 14 at the paper contact position is the difference plate 6
Is formed so as to engage with the cut 6a provided in the above.

Further, a swing shaft 16 is suspended below the contact shaft 11 with both ends pivotally supported by left and right frames, and a free end of a swing arm 17 fixedly fastened to the swing shaft 16. The section supports a plurality of sets of holding claw devices 20 (hereinafter referred to as claw 20), each of which includes a claw 18 and a claw base 19 and is opened and closed by an opening / closing drive device (not shown). Then, the swing shaft 16 and the swing arm 1
The swing device 21 is configured by the hook 7 and the claw 20. 3 is a claw shaft of the swing device 21.

In this way, when the swing shaft 16 is rotated in a forward / reverse direction by a predetermined angle by a cam mechanism (not shown), the swing arm 17 swings in a forward / reverse direction by a predetermined angle, and the pawl indicated by reference numeral 20 appears. It is configured to move between a holding position and a retreat position indicated by reference numeral 20A.

Also, from the leading edge of the difference plate 6, a paper 15
Guide plates 22 each having a guide surface formed in an arc shape in front view and in a strip shape in plan view so as to follow the traveling trajectory of the claw 20 of the swing device 21 for transporting the sheet.
However, the pawl 20 is provided so as to protrude in the direction of the transfer drum 1 with a different phase in the axial direction of the difference plate 6, and slides and guides the non-holding portion of the paper 15 conveyed in addition to the pawl 20. It is configured as follows.

[0023] Furthermore, in the present apparatus, the guide plate 22 and the guide member 23 of a special shape having the same purpose (not shown in FIG. 3), and the guide member 2 4, the pawl 20 of the swing device 21
The phase difference is provided in the axial direction of the difference plate 6.
Of these, the guide member 23 is a fixing portion 23 for fixing to the difference plate 6.
and a, are formed in plan view in the reverse L shape in the guide section 2 3b extending in the lateral direction along the transfer cylinder 1 side of the front guides 14 from the tip, the guide member 23 is right feedboard 6 It is provided near the end. In this way, even if the front pad 14 falls down and the paper 15 is not held, the non-holding portion is guided.
The portion 23b guides the paper 15 so as not to hang.

The guide member 24 is guided in a plan view by a fixing portion 24a for fixing to the difference plate 6, and a guide portion 24b extending in the left-right direction along the transfer drum 1 side of the front pad 14 from the tip.
The member 23 is formed in an L-shape that is symmetrical with the member 23, and the guide member 24 is provided near the end of the difference plate 6 opposite to the position where the guide member 23 is installed in the axial direction. In this way, even when the front pad 14 falls down and the paper 15 is not held, the guide portion 24b guides this non-holding portion and the paper 15
Is configured not to hang down.

For example, when the size of the paper 15 is the B-row half-trial,
Since the left end of the paper 15 comes to the position indicated by the symbol A in FIG. 3, the left end of the paper 15 is held by the claw 20 of the third swing device 21 from the left. The portion corresponding to the front end 14 corresponding to a portion indicated by reference numeral B in FIG. 3 between the left end A of FIG. When the non-holding portion passes through the front pad 14, there is a guide portion 24b of the guide member 24 immediately after that, and the non-holding portion of the paper 15 is lifted by the arc-shaped guide surface. 2 is configured to be reliably guided and held to the holding surface of the claw 4 of the transfer drum 1 shown in FIG.

The operation of the paper guide device configured as described above will be described. The paper 15 sucked one by one at the suction opening of the sucker device is sent to the difference plate 6 via the paper feed roller and the feeder board 5, and after being registered in the left-right direction by a horizontal needle device (not shown), it stands up. By contacting and stopping the front patch 14, the register in the vertical direction can be registered.

At this time, the swing mechanism 21 is driven by the cam mechanism.
Swing arm 17 swings and the claw 20 opens and closes, so that the tip of the paper 15 is held by the claw 20. Next, since the swing arm 17 swings in the opposite direction to the previous direction by the cam mechanism, the paper 15 held by the claws 20 is conveyed. At this time, the front contact arm 12 swings by the cam mechanism, and the front contact 14 moves to the dashed line position in FIG. 2 and retreats below the conveyance path of the paper 15, so that the conveyance of the paper 15 is not hindered.

When the paper 15 is conveyed by the pawl 20 of the swing device 21, the non-holding portion of the paper 15 is
The paper non-holding portion is raised or fluttered by the turbulence of the air caused by the claw 20 or the swing arm 17 of the swing device 21 returning in the direction of the disc 6 due to the turbulence of the air. The paper 15 is not scratched or wrinkled, and the non-holding portion of the paper 15 is not pressed against the sharp end of the differential plate 6 by wind pressure and is not broken.

Further, in the present apparatus, near the left and right ends of the difference plate 6, a guide member 23 having an inverted L-shape in plan view and a guide member 2 having an L-shape in plan view are symmetrical in plan view.
4 and the guide portions 23b and 24b are formed, so that even if the front pad 14 falls down and the paper 15 is not retained, the non-retained portions are supported and guided by the guide portions 23b and 24b. Therefore, the paper 15 does not hang down.

That is, the dimension from the grip portion of the swing device 21 to the left and right ends of the paper 15 becomes longer, and this portion is not held in the width direction of the paper 15, or the claw 20 of the swing device 21 Holder and paper 15
Even if the right and left ends of the paper 15 coincide with each other, the non-holding portion does not hang down, and the paper 15 correctly corresponds to the claw 4 of the transfer drum 1. In addition, since no corner break occurs, the amount of waste paper is reduced.

The paper 15 thus replaced with the pawl 4 of the transfer drum 1 is wound around the peripheral surface of the transfer drum 1 by the rotation of the transfer drum 1, and thereafter, the pawl of the transfer drum and the pawl of the impression drum are rotated. The paper 15 conveyed by repeating the grip between
Printing is performed by transferring the image formed on the plate surface on the plate cylinder directly or via a blanket cylinder. The pawl 20 of the swing device 21 returns to the holding position of the paper 15, and the front pad 14 returns to the register position.

In the present embodiment, the guide members 23 and 24 provided near the left and right ends of the difference plate 6 are formed in an inverted L shape in plan view or an L shape in plan view. Fixed
The parts 24 a may be provided on both sides, the leading ends thereof may be connected by the guide parts 24 b, and the whole may be formed in a U-shape in plan view so as to surround the front pad 14.

In this embodiment, the guide members are provided on the guide plates near the left and right ends of the difference plate 4. However, the position where the guide members are provided is not limited to this position. Needless to say, it may be provided.

[0034]

As is apparent from the above description, according to the present invention, it is possible to match the register with the front contact which is brought into contact with the leading edge of the paper fed onto the difference plate and the register is used. And a swing device that has a holding member that holds the leading end of the paper and transfers the paper held by the holding member to a printing cylinder. a guide member for guiding the paper provided to be, the guide member, the guide portion is indicia provided on the guide member
A position corresponding to the front contact in the axial direction of the printing cylinder.
By which is arranged to face the front lays printing cylinder side of the I, no holding portion of the paper regardless of paper size, special having ordinary guide plate or guide part without sag or rage Since it is supported by the guide member of the shape and accurately guided to the gripper of the printing cylinder and gripped, the gripper can be changed smoothly, the paper conveyance performance is improved, and the paper non-holding part is wind pressure etc. Since it does not flap or be damaged, the quality of the printed matter is improved and the amount of waste paper is reduced.

[Brief description of the drawings]

FIG. 1 is a front view of the vicinity of a swing device.

FIG. 2 is a front view of the vicinity of a front contact.

FIG. 3 is a plan view showing a left half in the vicinity of a front end of a difference plate.

FIG. 4 is a plan view of a guide plate.

FIG. 5 is a front view of the guide plate.

FIG. 6 is a plan view of a guide plate formed in a manner opposite to that shown in FIG. 4;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Transfer cylinder 4 Claw 6 Difference plate 14 Front cover 15 Paper 20 Claw 21 Swing device 22 Guide plate 23 Guide member 23b Guide part 24 Guide member 24b Guide part

Claims (1)

(57) [Scope of request for utility model registration] 1. A holding member for holding a leading edge of a sheet fed onto a difference plate by bringing the leading edge of the sheet into contact with the holding member and holding the leading edge of the sheet registered by the leading edge. And a swinging device for conveying the added paper and transferring it to a printing cylinder.In a sheet-fed printing press, a guide member for guiding the paper conveyed while being held by a holding member of the swing device is provided, and the guide member is The guide part provided on this guide member is marked
A position corresponding to the front contact in the axial direction of the printing cylinder.
Sheet guide device of the sheet-fed printing press characterized by being arranged to face the front lays printing cylinder side of me.