JPS60962A - Safety devices for sheet-fed rotary printing presses - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [1] Technical Field of the Invention The present invention provides a safety device for a sheet-fed rotary printing press to prevent accidents that may occur when paper being conveyed in the printing section is not conveyed accurately. Regarding.

[Prior Art] Conventionally, this type of sheet-fed rotary printing ε is configured as schematically shown in FIG. To briefly explain this, the printing machine, which is generally designated by the reference numeral 1 in the figure, is a four-color printing type as an example, and continuously feeds a large number of stacked sheets 2 one by one. a printing device 4 consisting of a paper feeder 3 for printing, a four-color printing unit (4a) that sequentially prints on the fed paper 2, and a discharge unit from which the printed paper 2 is sequentially ejected and layered. A series of devices such as '5' have been missed.

In the figure, 3a is a paper feed tray that guides the paper 2 from the stacking table of the paper feed device 3 to the printing device 4, and 5a is the paper 2 from the printing device 4.
5b is a paper delivery cylinder.

Each printing unit 4a of the printing device 4 has a well-known standard,
A plate cylinder 6 has a printing plate attached to its circumferential surface and is attached with an inking device for supplying ink to the plate surface and a supply device for supplying dampening water (both not shown). A blanket cylinder 7 serving as a printing cylinder to which an image formed with ink and dampening water is transferred onto the plate surface is brought into pressure contact with the paper 2 which is brought into contact with the blanket cylinder T and is held therein. A double-diameter press 1]F18 for printing is provided, and a double-diameter transfer cylinder 9 is disposed facing each other between the impression cylinders 8 of each unit 4a.

In such hydrocyanic acid, the paper 2 on the paper stacking table of the paper feeding device 30 is sucked one by one by a suction device (not shown) and sent onto the paper feeding table 3a, and then the first color is pressed by a swing device. Each rubber cylinder T and impression cylinder B Four-color multicolor printing is performed between the two.

By the way, in the printing press 1 using solid cyanide, during the printing operation, the printing paper 2 is rolled up against the printing cylinder 7 in the printing device 4 due to malfunction of the gripper, stickiness, poor paper feeding, etc. ↑Instead of using a blanket wrapped around the printing cylinder T, instead of using a blanket that tends to cause folding, etc., resulting in poor conveyance, and resulting in a large amount of defective printing due to the shift in conveyance timing, There was also the problem that the packing, as well as the printing plates of six plate cylinders, etc., were damaged, and as a result, the printing press 1 became unusable and the printing work was interrupted. However, it is not just that the above-mentioned defective conveyed paper adheres to the printing cylinder T or gets mixed into the ink or water supply device and impairs the operating functions of various parts, but rather that the type, quantity, or condition of such defective conveyed paper In some cases, there was a risk of bending the printing cylinder and damaging or destroying parts of the machine.

In addition, in this kind of conventional apparatus, there is no device attached to detect the above-mentioned poor conveyance state of the printing paper, and instead of putting a heavy burden on the operator, once a conveyance defect occurs, It required a great deal of effort and time to remove the defective conveyed paper and maintain and inspect each part.

Further, in order to eliminate the above-mentioned defective paper being conveyed, constant adjustment of the conveying claws has always been a tedious task.

Of course, conventional practice has been to check the number of sheets supplied on the paper feed side and the number on the paper output side to detect abnormalities during transport, but it is not possible to properly determine the prefectural location. I can't do it,
This is because large objects tend to transfer, and it cannot be said that transportation defects can be appropriately and reliably prevented.

[Summary of the invention]

The present invention has been made in view of these circumstances.
Equipped with a sensor for detecting defective conveyed paper, which is swingably arranged with one end close to and facing the outer peripheral surface of the printing cylinder, and a switch that is activated by this sensor to send out a stop signal. This simple (1'f) configuration maintains the originality and quality of the printing press, eliminates unnecessary printing burden on the printer, and also eliminates machine errors caused by defective conveyed paper during printing. To provide a safety device for a sheet-fed rotary printing press that can reliably prevent damage to printing materials and the like.

Embodiments] The present invention will be described in detail below using embodiments shown in the drawings.

2 to 6 show an embodiment of the safety device for a sheet-fed rotary printing press according to the present invention. In these figures, the safety device FT, which is designated as a whole by reference numeral 10, is shown in FIG. 1, for example. It is attached to a portion on the downstream side in the rotational direction of the blanket cylinder 7, which is a printing cylinder, and is indicated by reference numeral A.

That is, in the printing device 4 of the printing press 1, the most likely conveyance defect state is when the good-quality conveyance paper 2 wraps around the blanket cylinder 7 due to a defective claw on the impression cylinder 8 side or a paper feeding defect. In this way, the surface becomes loose and sagging. Therefore, such transportation defects can be
If prussic acid is detected quickly and appropriately on the downstream side in the direction of rotation of the blanket cylinder T and a stop signal can be sent to remove the blanket cylinder 7, stop the supply of the printing paper 2, and stop the operation of the printing press, printing can be performed. This can eliminate problems such as defects and damage to various parts.

To avoid this, according to the present invention, the sensor 11 for detecting defective conveyed paper is swingably disposed so that one end thereof approaches and faces the outer peripheral surface of the blanket cylinder T on the downstream side in the rotational direction.
This sensor 11 is pivotally supported on both ends thereof, and
Bearer 7n, 7aKjU on both ends of rubber cylinder 7 Roller 12
. When the right pair of levers 15.15 and the sensor 11 are rotated by the defective conveyed paper 2, the contact is closed and the above-mentioned stop signal is sent out. It is characterized by the addition of a limit switch 16.

To explain this in detail, according to this embodiment, the sensor 11
It also served as a saucer placed around the rubber cylinder 7 (T
It is made of T. This tray is used to prevent the cleaning liquid from falling onto the impression cylinder 8, transfer cylinder 9, etc. below when wiping off paper powder etc. adhering to the blanket cylinder 7 by applying cleaning liquid to a rag or the like. By using it as the sensor 11, there are significant advantages in terms of size, space, and cost.In particular, the disadvantage of using such a sensor 11 is that the rubber cylinder 7 and By being arranged in parallel and over the entire width, it is possible to detect the defective conveyed paper 2 in any condition in which it comes up.
This is also required as a saucer.

The sensor 11, which also serves as a saucer, is fixed via a screw 17a to the center in the axial direction of the stay 14 between the frames 13 and 13 on which the levers are supported. The holder 1 functions to adjust the gap between the outer peripheral surface of the rubber cylinder 7 and to limit the return position after detection.
Its rotation in one direction is restricted by the adjusting screw 18 on the top of the lever 7, and its rotation in the counterclockwise direction in FIG. The force is applied to the cylinder so that the entire cylinder maintains a substantially horizontal state, with one end facing the outer surface of the rubber cylinder 7. Here, the spring 19 applies a biasing force to the sensor 11 in order to prevent malfunction of the sensor 11 that detects the defective conveyed paper 2 and to prevent the sensor 11 from operating accurately during printing press operation. It should not be kept in a safe state. Furthermore, the above-mentioned limit switch 16 is fixed to this holder 17, as shown in FIG.

Further, left and right levers 15.15, which rotatably support the sensor 110 at both ends thereof, are fixed to both ends of the stay 14 with screws 15a, 15a, and support the sensor 11. Brackets 15b, 15b are fixed thereto, and have arm portions 15c, 15c that pivotally support rollers 12, 12 that are in contact with the blanket cylinder T side. These levers 15 are connected to the stay 1 as shown in FIG.
Collar 20 fitted into 4 and fixed by screws 20a
This restricts the strain D of the stay 14 in the axial direction.

Further, as shown in FIGS. 3 and 6, the stay 14 is rotatably mounted on frames 13 and 13 on both sides, and the stay 14 is connected to a collar 21 fixed to the frame 13 side with a screw 21a. Both levers are fixed between the levers 15, and a spring 22 wound around the stay 14 causes the rollers 12 on the lever 15 side to be attached counterclockwise in FIG. power is given.

This is because the lever 15 and the sensor 11 supported by it rotate clockwise in FIG. 2 about the stay 14 as the blanket cylinder 7 moves when the printing is stopped. This is also to cause the rubber cylinder 7 to follow the east exit movement. Note that the cyanide stop necessary for removing the rubber cylinder 1 is well known, and its explanation will be omitted.

As shown in FIG. 2, in such a safety device fi'ff1O using cyanide, when the sensor 11 is pressed by the defective paper 2 that has been wrapped around the rubber jacket and floated up, It rotates clockwise, detects the conveyance failure state, closes the contact of the limit switch 16, and sends out a stop signal. In this way, the limit switch 16
When a signal is sent from , during printing, the blanket cylinder 7 is placed in a non-printing state, that is, the cylinder is removed, and the paper supply from the sheet feeder F1 is stopped, causing the operation of the entire printing press to suddenly stop. Note that when such paper transport failure occurs during non-printing, the supply of paper is stopped and the operation of the printing press is abruptly stopped.

When the defective conveyed paper is removed by the operator in this stopped state, the sensor 11 returns to the position set by the spring 19, and the defective conveyed paper can be detected again.

In addition, when the above-mentioned safety device 1'' (10) is removed or inserted into the blanket cylinder 7, it is rotated following this by the action of the spring 22, and the outer peripheral surface of the sensor 11 and the blanket cylinder 7 is rotated. It will be clear that the gap between the two is always kept constant.

In addition, the present invention is applicable to the above-mentioned embodiments (not limited to 17 structures,
It is my confession that I may modify or change the shape of each part + 17'lJ structure etc. as appropriate.

For example, as shown in FIG. ε37, a limit switch 16 may be provided on the lever isa.

In addition, this lever 15 can be rotated with respect to the stay 14 (
J and spring 2 as shown in Figures 8 and 9.
According to the safety device of the printing press, which fixes the stay 14 with the frame 13. The sensor is arranged in a swingable manner, and a switch is attached that is activated by the sensor to send out a stop signal. Despite its simple configuration, it achieves various excellent effects as listed below. play.

(1) Since defective conveyed paper is detected using a sensor placed over the entire width of the printing cylinder, it is possible to accurately and reliably detect defective conveyed paper in any condition. It is possible to improve productivity and quality without causing problems such as printing defects.

(2) By properly detecting the defective conveyed paper as described above, there is no need to replace the paper or make a new printing plate due to damage to the printing material due to the paper being wrapped around the printing cylinder and folded. This eliminates interruptions during printing.

(3) Failures in ink, water supply, and other devices caused by defective conveyed paper are eliminated, and the conventional problem of interruptions in regular printing due to cleaning, etc., is eliminated.

(4) Since it is a B configuration that always follows the outer peripheral surface of the rubber cylinder,
For example, even if the position changes due to paper thickness adjustment, etc., a high detection effect of defective conveyed paper can be obtained.

(5) At the time of printing e'13, the operator only needs to perform normal operations such as exchanging printing plates and plans or adjusting nails, and other operations are unnecessary, which is effective in reducing the burden on the operator.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a schematic configuration of a sheet-fed sheet-fed printing press to which the present invention is applied, and FIGS. 2 and 3 are a side view and a main part showing an embodiment of a safety device according to the present invention. Floor plan, 4th
The figure is a sectional view of the main part showing the holder part with the switch, Figure 5 is an exploded view of a part of the lever with the sensor and rollers, Figure 6 is a detailed view of part B in Figure 3, and Figure 7 9 to 9 are a side view of a main part, a plan view of a main part, and a detailed view of a C portion thereof, showing another embodiment of the present invention. 1... Sheet-fed printing pattern, 2... Sheet-fed paper, 4...
... Printing device, 6... Plate cylinder, 7... Rubber cylinder (printing cylinder), 8... Impression cylinder, 10... Safety device, 11
...sensor, 12...roller, 13...frame, 14...steer (,15...lever, 16
...Switch, 17...Holder, 18...
Adjustment screw, 19... spring, 22... spring. Patent applicant Komori Printing Machinery Co., Ltd. Agent Masaki Yamakawa (1 person) Figure 3 Figure 5 Figure 1

Claims (1)

[Claims] a sensor for detecting defective conveyed paper, one end of which is disposed close to and opposed to the outer peripheral surface of the print cylinder on the downstream side in the rotational direction;
The sensor is swingably supported, and has a roller in contact with both panes of the printing cylinder, and is horizontally suspended between the main body frames, and is biased so that the roller is always in contact with the printing cylinder side on the l-hysteresis. A pair of left and right levers are pivotally supported in the
1. A safety device for a sheet-fed rotary printing press, comprising: a switch that detects when the sensor is oscillated by a defective forging bottle and sends out a stop signal.