JPH0350109Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a paper presser plate used in the paper feed front section of a sheet-fed printing press.

[Conventional technology]

Figures 4 to 8 are for explaining the conventional technology. Figure 4 shows an overall front view of an example of a sheet-fed printing machine, and Figures 5 and 6 show the front section of the sheet-fed printing machine. FIG. 7 shows a front view of the installation of the paper presser plate, and FIG. 8 shows a state diagram of the paper presser plate during printing.

Generally, in offset sheet-fed printing, as shown in Fig. 4, sheets 06 are taken out one by one from the top of a stack of sheets in a pile 05 in a sheet feeding section 01, placed on an endless tape 07, and placed at the end of a front contact plate 08 of a registration section. It is fed so as to stop at the front pawl 09 provided in the. The front end of the paper 06 is the swing gripper 01
0 and is pulled out and delivered to the first intermediate cylinder 011 of the printing unit 02. Thereafter, the printing paper passes through the path of the arrow, and the first color printing is performed between the impression cylinder 012 and the blanket cylinder 013 of the first color printing unit 02, and then passes through the second intermediate cylinder 014 to the impression cylinder 015 of the second color printing unit 03. After the second color printing is performed between the blanket cylinders 016, the paper is discharged via the paper discharge section 04.

To explain the operation of the paper feed section 01 in more detail in FIG. It's called,
A front pawl 09 is provided to set the paper inside the registration section at a fixed position, and a swing gripper 010 is provided to speed up the paper to the circumferential speed of the first intermediate cylinder and feed it there. Paper 06 is the front claw 09
When set in a certain position, the swing gripper is 0.
10 comes and grabs the front end of paper 06. Then, the front pawl 09 moves to the left on the rotation locus 017 and retreats. Next, the swing gripper 010
6 and move it along the rotation trajectory 018 to the first intermediate cylinder 011
Rotate to the point of contact with. Trajectory 018 is trajectory 017
Pass through the outside of the front pawl 09 and swing gripper 0
The positions 10 are out of phase with each other in the plane so that there is no hindrance to each movement, so the front pawl 09
The paper 06 is transferred from the to the swing gripper 010 without any problem. At this time, the sheets 06 are fed one after another onto the front contact plate 08, and the state in which the next sheet is fed in a lap shape so that it slips under the previous sheet can be seen in FIG.

When the front end of the paper 06 is grabbed by the swing gripper 010 and accelerated to the circumferential speed of the first intermediate cylinder 011 and moves in a circular motion on the trajectory 018, the end of the paper is not restrained, so it moves outward from the trajectory 018 due to the action of centrifugal force. When it receives the force of trying to pop out, it swells and causes the so-called ``abare'' phenomenon. In order to suppress this, a plurality of paper holding plates 020 are attached to the horizontal bar 022 via fasteners 021, and a gap is provided between the paper holding plate 020 and the front holding plate 08 to form an appropriate paper passage, thereby preventing irregular movement of the paper trailing edge. suppress.

[Problem that the invention attempts to solve]

Figure 7 shows paper holding plate 02 when paper is not passing through.
However, FIG. 8 shows the state of the paper presser plate when the paper is "flashed".

1. When the trailing edge of the previous paper passes, the paper presser plate is thrown up due to ``flagging'' and the presser of the next paper is broken, which tends to cause the paper to bulge one after another.

2. Printing problems such as registration errors and paper wrinkles occur due to the phenomenon described in the previous section.

3 The higher the printing speed, the greater the extent of these disturbances. Therefore, it is forced to operate at a low speed, resulting in a decrease in productivity.

[Means for solving problems]

Divide the end of the paper presser board from the fixed part into two long and short pieces.
It has a two-layered structure with a short piece layered under a long piece.

[Effect]

By providing a short piece under the long piece, when the previous paper passes, the paper presser plate is prevented from jumping up due to "flare", and the short piece maintains its original state, allowing the next paper to pass. There is no effect on the presser foot function.

〔Example〕

Figures 1 to 3 show an embodiment of the paper press plate of the present invention. Figure 1 is a front view of the operating state, Figure 2
The figure is a front view of the installed state, and FIG. 3 is a plan view of FIG. 2.

The composite paper presser plate of the present invention is shown in Figures 1 to 3.
As shown in the figure, a fixed part 20b for the holding rod 20a
It is constructed by dividing the tip into two long and short pieces 20c and 20d of different lengths, and arranging the short piece 20d below the long piece 20c. 21 is a fastener;
2 is the horizontal bar.

The action of the composite paper presser plate 20 is shown in FIG.
The front end of the paper 6 is gripped by a swing gripper (not shown), and a first intermediate cylinder (not shown)
When the trailing edge of the paper 6 moves irregularly and jumps up after being delivered to the paper 6, the long piece 20c of the paper press plate fixed to the holding rod 20a with appropriate elasticity is used to The short piece 20d of the paper press plate does not change its posture as it makes an independent movement to press the tail of the paper. Therefore, the subsequent paper 6 can maintain a stable course and reach the front pawl 9 (see FIG. 2) without interfering with the trailing edge of the paper.

In this way, by using the composite paper presser plate of this invention, it is possible to fundamentally eliminate the problems that occur with conventional products, where paper swells one after another, causing printing problems such as misregistration and paper wrinkles. It became.

[Effect of idea]

By dividing the paper holding plate into two pieces, long and short, from the part fixed to the holding rod, and placing the short piece below the long piece, sheets that are wrapped and fed one after another can be wrapped in a chain. It has now become possible to fundamentally eliminate the problems that occur due to printing problems such as poor registration and paper wrinkles caused by jumping up and "waving".

[Brief explanation of the drawing]

Fig. 1 is a front view of an embodiment of the composite paper presser plate of the sheet-fed printing press of the present invention in an operating state, Fig. 2 is a front view of the device shown in Fig. 1 in an installed state, and Fig. 3 is a plan view of Fig. 2. It is a diagram. Figure 4 is an overall front view of the sheet-fed printing press.
5 and 6 are a front view and a plan view of the paper feeding front section in the conventional device, and FIGS. 7 and 8 are a front view and a front view of the paper holding plate in the conventional device in an attached state and a front view in a printing state, respectively. It is a diagram. 6...Paper, 20...Paper presser plate, 20a...Holding rod, 20b...Fixing part, 20c...Long piece, 20
d...Short piece.

Claims (1)

[Scope of utility model registration request] In the paper feed register, the paper holding plate to prevent the paper from jumping up is divided into two long and short pieces from the part fixed to the holding rod, and the short piece is provided below the long piece. Features a composite paper presser plate for sheet-fed printing machines.