JPH0427150B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a folding machine for a printing press.

The folding cylinder of a folding machine of a conventional printing press is explained with reference to FIGS. One end communicates with a ventilation hole (not shown) provided in the printed paper adsorption section on the outer peripheral surface of the folding cylinder 1. Further, 4a is the operating side frame, 4b is a fastener provided on the operating side frame 4a, 4c is a bearing fixed to the operating side frame 4a via the same fastener 4b and a bolt 4d, and 3 is a bearing fixed to the operating side frame 4a via a bolt 4e. As shown in FIG. 2, the timing valve 2b fixed to the coaxial bearing 4c is arranged so that it faces the other end of the intake passage 2a in the folding cylinder 1 by approximately one-third of the inner circumferential surface of the timing valve 3. The intake passage 2c is an intake passage provided in the range of 2c, which extends to the vacuum pump 2d through the wall of the timing valve 3, and when the intake passage 2a of the folding barrel 1 reaches the position a in FIG. 2a begins to open relative to the intake passage 2b of the timing valve 3, and when the intake passage 2a of the folding barrel 1 reaches position b in FIG. 2, the intake passage 2a fully opens relative to the intake passage 2b of the timing valve 3. Then, while the intake passage 2a communicates with the intake passage 2b, the folding drum 1
The air around the printing paper suction part on the outer periphery of the paper is sucked by the vacuum pump 2d through the ventilation hole provided in the suction part → intake passage 2a → intake passage 2b → intake passage 2c, and the printing paper is sucked by the vacuum pump 2d. It is designed to be sucked into a suction section and transported.

In the folding cylinder of the folding machine of the printing press, from a position a where the intake passage 2a of the folding cylinder 1 begins to open with respect to the intake passage 2b of the timing valve 3, to a position where the intake passage 2a fully opens with respect to the intake passage 2b of the timing valve 3. The rotation angle α of the folding drum 1 until reaching b is determined by the diameter of the intake passage 2a and the axial radius R of the folding drum 1 of the timing valve 3 part, but the diameter of the intake passage 2a is determined from the maximum flow rate, and Once determined, the moving distance along the circumferential direction from the opening start point of the intake passage 2a to the full opening position is determined, so the rotation angle α of the folding cylinder 1 from the opening start position a to the full opening position b of the intake passage 2a is reduced. In order to shorten the switching time from when the intake passage 2a begins to open to when it is fully opened, it is necessary to increase the shaft radius R of the folding cylinder 1 of the timing valve 3 portion. However, as is clear from Fig. 1, the axial radius R of the folding cylinder 1 is
Since the diameter of the outer circumferential portion of the folding drum 1 is smaller due to various constraints, the rotation angle α of the folding drum 1 from the opening start position a of the intake passage 2a to the fully open position b is made small to increase the opening of the intake passage 2a. It is not possible to shorten the switching time from the start to full opening to a certain level,
In the configuration shown in FIGS. 1 and 2, the rotation angle α of the folding drum 1 is
is about 11 degrees, and crisp vacuum suction and release cannot be performed. In addition, the distance from the printed paper suction part on the outer peripheral surface of the folding cylinder 1 to the suction passage 2b is long, and due to the piping capacity and resistance of the piping, the timing of suction action on the suction part and the suction stop are delayed, resulting in a high speed. During operation, this also caused the problem that crisp suction and release were not performed.

The present invention addresses the above-mentioned problems, and includes an intake passage communicating with a plurality of ventilation holes provided in the printed paper adsorption section on the outer peripheral surface of the folding cylinder, and a pressurized air passage communicating with the ventilation holes within the folding cylinder. At the same time, an on-off valve for the intake passage is provided on the vent side of the intake passage, and an on-off valve for the pressurized air passage is provided on the vent side of the pressure air passage, and a cam ring mechanism for operating these on-off valves is attached to the swing arm. This relates to a folding machine for a printing press characterized by comprising a cam follower arm and a cam follower arm. An object of the present invention is to provide an improved folding machine of a printing press that can perform the following operations.

Next, the folding machine of the printing press of the present invention will be explained with reference to an embodiment shown in Figs. 3 to 8.
In the figure, 5 is the folding drum, 6 is the rotary joint provided at the axial end of the folding drum 5, 7 is the intake passage provided in the axial direction inside the folding drum 5, and 8 is the intake air inside the folding drum 5. A pressure air passage provided parallel to the passage 7, an intake passage 9 communicating with the intake passage 7 via the rotary joint 6, and a pressure air passage 10 communicating with the pressure air passage 8 via the rotary joint 6. The intake passage 9 is an air passage, and the intake passage 9 is a vacuum pump (not shown).
The pressurized air passages 10 each communicate with a pressurized air supply source (not shown). 11 is the folding cylinder 1 near the printed paper suction part 12 on the outer peripheral surface of the folding cylinder 5.
The other end of the intake passage 7 is connected to the ventilation chamber 11 through the intake passages 14 and 15, and the other end of the pressure air passage 8 is connected to the ventilation chamber 11 through the pressure air passage 16. We have contacted each of them. Further, reference numeral 13 denotes a ventilation hole that connects the outer surface of the printing paper adsorption section 12 of the folding cylinder 1 and the ventilation chamber 11, and the ventilation chamber 11 and the ventilation hole 13 are arranged in a required number dispersed along the axial direction. It is provided. Reference numeral 17 denotes an intake passage opening/closing valve for opening and closing the intake passage 14; 18 denotes a pressure air passage opening/closing valve for opening and closing the pressurized air passage 16; 19 denotes a swing shaft provided in the folding cylinder 1; A cam follower arm 21 is attached to the outer end of the swing shaft 19, a cam follower 22 is attached to the cam follower arm 21, and a cam follower 22 is attached to the cam follower arm 21.
When the cam 23 contacts the outer surface of the fixed cam 23 in FIG. 6 and rotates in the direction of the arrow in FIG. 6, the swing shaft 19 performs a swing motion. Further, reference numeral 20 denotes a swinging arm, which is attached to the swinging shaft 19, and the swinging arm 20 is connected to the on-off valve 1.
7 and 18 are supported, and these swing shafts 19
The on-off valves 17 and 18 are reciprocated by the swinging of the swinging arm 20, thereby switching between adsorption and opening. The intake passage opening/closing valve 17 is constructed as follows. The on-off valve 17 is the sixth
In the figure, it is closed until the end, starts to open at , and fully opens at . Since the on-off valve 17 is in the middle of opening operation, the required opening area (the required opening area refers to the passage area determined by the maximum flow rate, and the required opening area = π x outer diameter D ₁ of the on-off valve 17 x on-off valve 17
The rotation angle Δθ of the folding drum 5 from the time it begins to open until the required opening area is obtained (hereinafter referred to as vacuum suction switching) (see Figure 6) In order to reduce this, the following measures are taken in the present invention. (a) Switch to vacuum suction near the cam center θ/2, which is the maximum speed of the valve. By selecting a locum curve, a large swing support H can be obtained within the same time. (c) By increasing the amount of swinging by the ratio of the arm lengths of the swinging arm 20 and the cam follower arm 21,
Increase the valve stroke S. D. The required opening area of the on-off valve 17 is determined by the maximum flow rate,
By providing a plurality of on-off valves 17, the flow rate per valve is reduced, and the required opening area per valve is reduced. E By increasing the diameter _D1 of the on-off valve 17, the amount of movement ΔS required for switching between vacuum suctions is reduced, and the switching time is shortened.

Next, the operation of the folding machine of the printing press will be explained with reference to FIGS. 7 and 8. FIG. 7 shows the intake passage opening/closing valve 17.
FIG. 8 shows the operating state of the pressure air passage on-off valve 18, and FIGS. 7 and 8 show the adsorption start state. At this time, the swing shaft 19 is rotated by the cam 23, and the on-off valves 17 and 18 begin to rise. The valves are switched when the rising speed of the on-off valves 17 and 18 reaches its maximum near the middle of the stroke. That is, first, the on-off valve 18 is connected to the pressure air passage 1.
6 to stop pressurized air from entering the ventilation chamber 11. A little later than that, the on-off valve 17 opens the intake passage 14 and sucks the air inside the ventilation chamber 11.
The printing paper 24 on the suction unit 12 is suctioned. Also the 7th
Figure 8 shows the adsorption state. At this time, the swing shaft 19 further rotates, and the on-off valve 1
7 and 18 are rising further. The interior of the ventilation chamber 11 is maintained at a constant vacuum pressure, and the printing paper 24 on the suction unit 12 is conveyed to a predetermined rotational position while being suctioned. Also, Figures 7 and 8 show the printing paper 24.
It shows the state at the beginning of release. At this time,
The swing shaft 19 begins to rotate in the opposite direction by the cam 23,
The on-off valves 17 and 18 begin to descend, reversing the adsorption start state, and the on-off valve 17 closes the intake passage 14 to stop suction in the ventilation chamber 11. A little later than that, the on-off valve 18 begins to open the pressure air passage 16, the pressure in the ventilation chamber 11 becomes high, and the printing paper 24 is separated from the folding cylinder 5 because the suction force is lost. Moreover, FIGS. 7 and 8 show the state from the time when the paper is released until the start of suction. At this time, the swing shaft 19
further rotates, and the on-off valves 17 and 18 further descend. Pressure air continues to be supplied into the ventilation chamber 11, and paper powder etc. remaining in the ventilation chamber 11 are removed from the folding cylinder 5.
It is discharged to the outside together with pressurized air.

The folding machine of the printing press of the present invention is configured as described above, and can achieve the following effects. (i) If vacuum suction is switched at the shaft end of the folding cylinder as in the past, the air passage leading to the suction part is long, piping capacity and piping resistance are large, and the vacuum pressure response is poor. However, in the present invention, the suction passage on-off valve is provided near the suction part, so the intake passage can be very short, and multiple on-off valves are provided in the axial direction of the folding body. If so, the amount of exchanged air per valve will be extremely small, the responsiveness of vacuum suction will be dramatically improved, and high-speed operation will be possible. (ii) Conventionally, even if the vacuum suction was stopped, vacuum pressure remained in the intake passage leading to the suction part, making it difficult for the printed paper on the suction part to separate, causing problems in high-speed operation, but in the present invention, By blowing in high-pressure air, paper release can be completed in an extremely short period of time, which also enables high-speed operation. In addition, by blowing in pressurized air, paper dust etc. that had accumulated in the ventilation chamber could be discharged, thereby eliminating clogging of the pipes. (iii) In the case of conventional vacuum switching, it was not possible to shorten the switching time required to fully open the intake passage 2a at the intake passage 2b section;
In the present invention, the vacuum suction can be switched near the maximum speed of the valve's reciprocating process, and the swing expansion rate can be appropriately selected by changing the arm length ratio between the swing arm and the cam follower arm. Also, by increasing the number of valves, the required opening area per valve can be reduced.
Furthermore, by changing the diameter of the valve, the amount of movement required for switching between vacuum suction can be appropriately selected, and as a result, the rotation angle of the folding drum required for switching the valve, which was approximately 11° in the past, has been reduced to 1.7°. Valve operation is completed approximately 6.5 times faster, which also has the effect of enabling high-speed operation.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. .

[Brief explanation of drawings]

FIG. 1 is a partially vertical front view of a folding cylinder of a folding machine of a conventional printing press, FIG. 2 is a vertical side view taken along the arrow line in FIG. 1, and FIG. 3 is a printing machine according to the present invention. FIG. 4 is a partially vertical front view showing an embodiment of the folding drum of the folding machine; FIG. 4 is a vertical side view taken along the arrow line in FIG. 3; and FIG. Vertical side view, No. 6
Figure 6 is an explanatory diagram of the operation of the intake passage on-off valve and the swinging mechanism, Fig. 6 is an explanatory diagram of the operation of the intake passage on-off valve, Figs. Figures 1 through 2 are explanatory views of the operation of the on-off valve for the pressurized air passage. 1... Folding body, 8... Pressure air passage, 9... Intake passage,
11...Vent hole, 17...Intake passage opening/closing valve, 18...
Pressure air passage opening/closing valve, 20... swinging arm, 21... cam follower arm.

Claims (1)

[Claims] 1 An intake passage communicating with a plurality of ventilation holes provided in the printed paper adsorption portion on the outer peripheral surface of the folding cylinder and a pressure air passage communicating with the ventilation holes are provided in the folding cylinder, and an on-off valve for the intake passage is installed in the intake passage. On the vent side of the pressure air passage, the on-off valve for the pressure air passage is placed on the vent side of the pressure air passage.
A folding machine for a printing press, characterized in that a cam link mechanism for operating these on-off valves is constituted by a swing arm and a cam follower arm.