JPH0462863B2 - - Google Patents

Description

Detailed Description of the Invention: Industrial Field of Application A safety device for a printing press for preventing foreign matter from entering the contact area between the impression cylinder and the plate cylinder, the safety device for preventing foreign matter from entering the contact area between the impression cylinder and the plate cylinder. A safety rod is provided adjacent to the area and at a small distance from the surface of the impression cylinder, the electrical contact being closed when the safety rod is displaced.

BACKGROUND OF THE INVENTION Safety devices for rotary printing presses are intended to ensure safety in hazardous areas where workers may be injured, particularly in areas where rotating machine parts are present. Such safety devices are prescribed by the authorities and must be kept, for example, at a distance of 4 mm from rotating mechanical parts.
It is now not allowed to exceed. Devices of this type are known, for example, from German Patent No.
It is disclosed in the specification of No. 1761258. In this known device, parallel to the cylinder gap and at a small distance from the area of contact between the impression cylinder and the blanket cylinder or between the impression cylinder and the plate cylinder, a safety rod is attached to the side frame by a spring-elastic force. It is supported by a bearing. When the safety rod is displaced by contact, the electrical contact is momentarily broken in the spring-elastic bearing of the side frame, thereby stopping the drive of the cylinder.

Another safety device of this type is also disclosed in German Patent No. 766 210. This safety device has the shape of a beveled part that is easily possible. The shear member projects into the cylinder gap between the two cylinders while a small distance is maintained between the edge of the shear member and the cylinder surface. The shear member is disposed on a bearing so that it can rotate to such an extent that its radius of rotation does not contact the surface of the shell. When the shearing member pivots, a switch is operated that stops the drive of the cylinder.

Problems to be solved by the invention However, the above-mentioned Federal Republic of Germany patent no.
A disadvantage of the known safety devices disclosed in 1761258 and 766210 is that the predetermined safety distance between the safety device and the shell surface is constant. This is because, especially when printing on thick paper (cardboard), in this device the printing surface and the safety device may come into contact, resulting in smearing of the printed sheets.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to obtain the smallest possible gap between the rotating part, for example a roller or cylinder, and the safety rod when the safety cover is open, and to ensure that the rotating part, when the safety cover is closed, can be It is an object of the present invention to provide a safety device for a printing press such that a gap as large as possible is obtained between the safety rod and the safety rod.

According to the invention, the safety rod is additionally provided with a cover flap, which can be brought into at least one open position and a closed position. In the open position of the cover flap, the safety rod is located at a small distance from the surfaces of the impression and plate cylinders, and in the closed position of the cover flap, the safety rod is located at a small distance from the surfaces of the impression and plate cylinders. located at a large distance from the surface.

Advantages The advantages obtained with the device of the invention are, in particular, that optimum protection for the personnel is guaranteed both during machine operation and during maintenance or adjustment work, and that the sheet does not come into contact with the safety rod. The advantage is that the quality of printing is not compromised.

Embodiment Next, the structure of the present invention will be specifically described with respect to an embodiment shown in the drawings.

The illustrated safety device consists of two
It has two safety rods 1 and 2. These two safety rods 1 and 2 are located between the impression cylinder 4 and the plate cylinder 6.
or between the impression cylinder 4 and the delivery system 3,
They are each arranged parallel to the trunk gap. The adjustment mechanism for the safety device is arranged symmetrically on both side walls of the rotating machine, so that only one side is shown in the drawing. This safety rod 1 is
The impression cylinder 4 is protected in the area between it and the delivery system 3. The safety rod 1 is welded to the first end of the horizontally extending rod 7.

The rod 7 is supported for horizontal movement on a pin 8 fixed to the frame. The upper guide of the rod 7 is formed by a roller 5 which is pressed downwards. The roller 5 is rotatably mounted directly on a pin 8 on a spring-loaded plunger 10 . Rod 10 is casing 1
It is arranged to be movable in the vertical direction within the range of 0.0 and 1. The casing 10,1 is fixed to the side wall of the printing press. The rod 7 is pivotably connected at its second end to a downwardly directed adjustment lever 11. The adjustment lever 11 is rotatably supported at the center of a pin 12 fixed to the frame. The lower end of the adjustment lever 11 has two tips 1
It is configured in a fork shape with 3 and 14.
These two tips 13, 14 also surround the pin 16 of the adjusting lever 18, which is slightly bent, with play. Below the pin 16, an adjustment lever 18 is pivotably supported on a pin 19 fixed to the frame. A first end of a horizontal tension spring 23 is suspended within the bore 22 . The second end of the tension spring 23 is fixed to a pin 25 fixed to the frame on the left side of the hole 22. The upper end of the adjusting lever 18 forms a stop for the cam 24 of the cover flap 26 for the impression cylinder 4 and forme cylinder 6. The cam 24 is arranged parallel to the impression cylinder 4 and the plate cylinder 6 and extends approximately from one side wall to the other side wall. The cover flap 26 is pivotably mounted in the two side walls about a pin. The lower end 27 of the adjusting lever 18 is pivotably connected to a second rod 28 arranged parallel to the first rod 7. At its end facing the cylinder, this second rod 28 is welded to the safety rod 2 forming a small angle and is horizontal between a bearing pin 29 fixed to the side frame and a roller 31. Bearings allow directional movement. The roller 31 is applied vertically to the underside of the rod from below. The rod 28 has a recess at the front end of its underside 32. The roller 31 is rotatably journaled on a vertically movable spring-loaded ram 34. The push rod 34 has its lower end 36 connected to the stepped portion 3.
7 and an inclined surface 38. The step portion 37 and the inclined surface 38 correspond to the operating roller 3 of the end detector 42.
9 has been contacted one after another. The termination detector 42 is
Fixed to the side wall of the printing press. Termination detector 42
has three switching stages.

The second connection between the first rod 7 and the second rod 28 consists of a connecting rod 43, a lever 44 and a lever 4.
6. The upper end of the connecting rod 43 is pivotally connected to the first rod 7, and the lower end is pivotally connected to the left arm 40 of a two-armed lever 44. Lever 44
is rotatably supported from a horizontal position by a bearing in the center of a pin 47 fixed to the side frame,
The right arm 45 is pivotally connected to a lever 46 that acts vertically downward. Lever 4
6 are two pins 48 and 49 fixed to the frame.
The rounded tip 51 presses against the upper side 54 of the rod 28.

In the closed position of the cover flap 26, the lever mechanisms 1, 2, 7, 11, 18, 28, 43, 44,
46 occupies the position indicated by the dash-dotted line. Tension spring 23 is fully tensioned. The safety rods 1, 2 are withdrawn from the cylinder gap between the impression cylinder 4 and the plate cylinder 6 and from the area between the impression cylinder 4 and the delivery system 3, so that the distance from the surface of the impression cylinder 4 to the safety rod is reduced. is approximately 24mm. The push rod 34 is completely pushed out of place by the spring force of the spring 53. The roller 39 of the end detector 42 is in the "free machine operation" switching position.

When the cover flap 26 is opened, the rods 1, 2, 7, 28 and the levers 11, 18, 4 are moved.
3, 44, and 46 turn to the positions indicated by solid lines.

The cam 24 pivots together with the cover flap 26 and the adjusting lever 18 is under the spring force of the spring 23.
Release the upper end 21 of. The adjustment lever 18 pivots around the pin 19 in a clockwise direction. At this time, the pin 16 of the adjustment lever 18 is
The adjusting lever 11 is pivoted clockwise about the pin 12, entraining the tips 13, 14 which surround it. Since the rod 7 pivotally attached to the adjustment lever 11 is moved horizontally to the right,
The safety rod 1 fixed on the rod 7 is connected to the blanket cylinder (transfer system 3) and the impression cylinder 4 until the distance of the safety rod 1 to the surface of the impression cylinder 4 is 3-4 mm.
It is pushed into the torso gap between the At the same time, the guide rod 28 pivoted on the lower end 27 of the adjusting lever 18 is moved horizontally to the right, so that the safety rod 2 is pushed into the cylinder gap between the impression cylinder 4 and the plate cylinder 6. At this time, the roller 31 rolls in the recessed portion of the lower end 32 of the rod 28,
When the step 33 is reached and the step 33 is exceeded, the push rod 34 is pushed downward against the spring force of the spring 53, and the roller 39 of the end detector 42 moves toward the inclined surface 3.
8 to the left in the horizontal direction, the end detector 42 is operated. In this position, only "fine movement" of the machine is possible. By moving the rod 7 horizontally to the right, the connecting rod 43, which is pivotally connected to this rod, is pivoted.
As a result, the lever 4 pivotally connected to the connecting rod 43
4 is pivoted clockwise around pin 47. This also causes the lever 46, which is pivotally connected to the lever 44, to be displaced vertically downward and into contact with the upper side 54 of the rod 28.

If the safety rod 1 or 2 is displaced in this position by the penetrated part, the rod 2
8 is displaced downward. When the rod 7 is displaced, the rod 28 is connected to the connecting rod 43 and the lever 4.
4,46. Rod 28
As a result, the push rod 34 is pushed downward by the roller 31 against the spring force of the spring 53, and passes through the stepped portion 37 to the end detector 4.
Operate 2. The adjustment obtained at this time means the command "stop machine".

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of a safety device for a printing press according to one embodiment of the invention. 1, 2...Safety rod, 3...Delivery system,
4... impression cylinder, 5... roller, 6... plate cylinder, 7... rod,
8... Pin, 9... End, 10... Push rod, 10, 1...
Casing, 11...adjustment lever, 12...pin, 1
3, 14... Tip, 16... Pin, 18... Adjustment lever, 19... Pin, 21... End, 22... Hole, 23...
Tension spring, 24, 25... cam, 26... cover flap, 27... end, 28... rod, 29... bearing pin, 31... roller, 32... lower side, 33... step,
34...Pushing rod, 36...End part, 37...Step part, 38...
Inclined surface, 39...Roller, 40...Arm, 42...Terminal detector, 43...Connecting rod, 44...Lever, 46...
Lever, 47, 48, 49...pin, 51...tip,
53...Spring, 54...Upper side.

Claims (1)

[Claims] 1 A safety device of a printing press for preventing foreign matter from entering the contact area between the impression cylinder 4 and the plate cylinder 6, which is a safety device for the printing press that is installed adjacent to the contact area between the impression cylinder 4 and the plate cylinder 6. Safety rods 1 and 2 are arranged at a small distance from the surface of the safety rod 1, and the electrical contacts are closed when the safety rods 1 and 2 are displaced. , 2 are additionally provided with a cover flap 26, which covers at least one
In the open position of the cover flap 26, the safety rods 1, 2 are brought into contact with the impression cylinder 4 and the plate cylinder 6.
It is located at a small distance from the surface of the
Safety device for a printing press, characterized in that, in the closed position of the cover flap 26, the safety rods 1, 2 are located at a large distance from the surfaces of the impression cylinder 4 and the plate cylinder 6.