EP0726145B1 - Security apparatus in rotary printing machines - Google Patents

Abstract

The safety device has a shaft (4) running in lateral bearings and parallel to a cylindrical component. A protection device (3,3'') is mounted on it and a control cam (2) with at least one associated end switch and a spring-loaded latching device (16). The control cam, which is attached to the shaft, has an electrically secured latching position (13) for the protection device in engagement with the spring-loaded latching device. It also has an electrically secured safety position (15) for the protection device on an adjacent cam branch (14). The protection device is connected to a machine protection device (11) via a coupling.

Description

The invention relates to a safety device on rotary printing machines, in particular as personal protection to protect cylindrical components.

DE 2 914 152 C2 discloses a safety device of this type known. To secure a nip, preferably between Printing cylinder and blanket cylinder are using Limit switches two sheets articulated together as a hinge. The first sheet is operated via a two-armed lever and one Switch pin the limit switch. The second sheet is by means of a spring movable against a stop. When the first sheet is actuated the second plate is arranged on the first plate carrier moved against the spring force. The press is against commissioning secured and can, however, in jog mode (creep speed) work. In addition to securing the nip, both serve Sheets also as a sheet guide on the printing cylinder.

According to DE 3 226 812 C2, a protective device is one in two Levels assigned to the side frames of the printing press educated. There is one in two joints of the gearbox Protection radially locked. The rest is by means of a curve segment and limit switches formed.

Another safety device is from DE 4 221 132 A1 known. A multi-part sheet-like inlet protection is to adjust and Maintenance work around an electrically protected horizontal Axis can be swiveled and side guards are remotely controlled around vertical axes pivotally arranged.

A disadvantage of these designs is that they are large as a result Variety of parts are relatively complex and no additional security the press at inching / creep speed as personal protection is available.

EP 0 182 080 A 2 describes a further safety device on sheet-fed rotary printing machines known. Mechanical switch bodies are rotatable at pivot points mounted on the machine stand and have a switching segment, which by means of limit switches and role electrically secure a basic position and a safety position. The switching segments are coupled by means of a switching rod, which is spring-connected is deflectable.

The object of the invention is to provide a simple safety device create an additional one even in jog mode / creep speed ensures active personal protection and the risk of injury noticeably minimized.

This is solved by the characterizing part of the main claim. Further training results from the subclaims.

The safety device is designed as a movable arrangement in several Positions positionable. It is over the rest positions in those Print mode (first stop position) and inching mode / creep speed (second locking position) is also possible in a safety position movable. The printing press is in this safety position stopped by a limit switch. The security position of the Safety device is coupled with a forced return, so that when taking the previous rest position as a result of Forced return of the protection, the printing press again in inching / creep speed can be operated. This security position reduces the risk of injury during maintenance or cleaning work for the operating personnel. For example the manual washing of an impression cylinder realized without hesitation become. If the operator's hand comes with the washing process Cylinder in contact and is taken in the direction of rotation of the cylinder, the hand bumps against the one in a locked position Safety device (protection). But the hand will not be the same as before squeezed between protection and cylinder, but moves the protection continue to a safety position in which the printing press immediately is stopped. The safety position is arranged that the hand does not slip between the cylinder and the protection can.

The invention will be explained in more detail using an exemplary embodiment become.

Fig. 1 und 2

eine Sicherheitsvorrichtung mit verschiedenen Raststellungen und einer Sicherheitsstellung,

Fig. 3

die Sicherheitsvorrichtung in Raststellung als Bogenführungselement,

Fig. 4

die Sicherheitsvorrichtung in Raststellung für Tippbetrieb/Schleichgang,

Fig. 5

die Sicherheitsvorrichtung in Sicherheitsstellung mit vorangegangener Raststellung für Tippbetrieb/Schleichgang.

Fig. 6

die Kurvenkontur der Steuerkurve.

Show:

1 and 2

a safety device with different locking positions and a safety position,

Fig. 3

the safety device in the locking position as a sheet guiding element,

Fig. 4

the safety device in the stop position for inching / creep speed,

Fig. 5

the safety device in the safety position with the previous detent position for inching / creep speed.

Fig. 6

the curve contour of the control curve.

In a sheet-fed rotary printing press, a printing cylinder 1 is between arranged the side frames of a printing unit. In a defined Distance to the pressure cylinder 1 is parallel to the lateral surface of the Printing cylinder 1 extending shaft 4 stored in the side frames. A protection 3, e.g. a sheet of metal that fixed itself extends over the full width of the impression cylinder 1. A side frame a control curve 2 is fixed adjacent to the shaft 4, which locking positions 13 and a safety position 15 has. The control curve 2 is assigned a limit switch 5, which is circuit-wise connected to a machine control of the printing press is. The control cam 2 is also engaged with a roller 8, which is rotatably arranged on a lever 10. The lever 10 is on one end in a fulcrum 7 mounted on the side frame and is connected to a spring 9 at its opposite end.

The spring 9 is fixed in a pivot point 6 on the side frame. The pivots 6, 7, roller 8, spring 9 and lever 10 form a locking device 16. Das Printing unit also has a machine cover 11 (FIG. 1). In the present For example, the control cam 2 has two locking positions 13. In the first locking position 13, the safety device serves as a sheet guiding device in printing operation (Position: protection 3).

In the second detent position 13, the device serves as personal protection (item Protection 3 '). The press can be operated in jog mode / creep speed for maintenance, Carry out cleaning or conversion work. In addition to the rest positions 13 the control curve 2 has a curve branch 14, the previous second locking position 13 is adjacent. The roller 8 runs on the curve branch 14 until it is reached from safety position 15 onwards (item protection: 3 ''). Is the security position 15 lapsed (due to the protection: 3 '' no more force), the roller 8 runs on the Curve branch 14 in the reverse direction of rotation into the adjacent, second locking position 13 (protection: 3 ') back. The control curve 2 has a motion law according to that in the first and second locking positions 13 of the protection: it 3 and 3 'a defined Force F of the spring 9 is applied to the roller 8. For security position 15 of the Protection 3 '' is the motion law of the control curve 2, especially the curve branch 14, such that after overcoming the rest, the force F of the spring 9 increases, the existing lever arm h, however, decreases in size. So the power is what acts on the fingers / hand on the protection 3 to 3 '' in the locking positions 13 as also relatively constant in the safety position 15.

In both locking positions 13, the lever arm h is zero (FIG. 6). Depending on requirements can the curve branch 14 also for increasing force F and increasing Lever arm h or geometric for decreasing force F and diminishing lever arm h be formed; these possibilities are not included in the scope of the claims. The safety position 15 is electrically protected in such a way that the printing machine is immediately stopped in this position (protection: 3 '').

The safety position 15 need not be at the end of the curve branch 14 be arranged. You can depending on the contour of the curve branch 14 and the safety-related conditions already with one slight deflection of the protection 3 'from the previous one Rest position 13 (after overcoming the pressure point). The device can also be on the curve branch 14 in one defined angular range can be further pivoted and e.g. a to compensate for slight overrun of the printing press.

In a further embodiment, the pivot point 7 of the lever 10 arranged in the middle (Fig. 2 and 3). 3 to 5 is on the Protection 3 a coupling 12 articulated in an elongated hole. The Coupling 12 is with the machine protection 11, for example one Kick, connected.

The operation of the device is as follows. Is in print mode the rotary printing press in the first detent position 13 of the Protection 3 used as a sheet guide. For example machine maintenance 11 actuated and the coupling 12, the second locking position 13 of the Protection 3 'taken. In the second locking position 13 of the protection 3 ', the rotary printing machine can only in Operate inching / creep speed. For example, if Printing cylinder 1 cleaned manually and the operator comes in Arrow direction in contact with the protection 3 ', this is in Deflected towards safety position 15 (protection 3 ''). The Deflection takes place without increasing force, so that bruises from Fingers or the hand can be avoided. After leaving the Lock position 13 in the direction of safety position 15 (protection 3 '') the operation of the printing machine stopped immediately. When withdrawing the Hand turns the safety position 15 of the protection 3 '' into the previous second locking position 13 of the protection 3 'moved back. This enables the printing press to run in inching / creep speed be operated. If the machine protection 11 is closed, so the first latching position 13 of the protection 3 is assumed (Printing operation) and protection 3 also serves as Sheet guiding device.

Reference list

1

Impression cylinder

2nd

Control curve

3rd

Protection (in the locked position of the sheet guide position)

3 '

Protection (in stop position for inching / creep speed)

3 ''

Protection (in safety position)

4th

wave

5

Limit switch

6

pivot point

7

pivot point

8th

role

9

feather

10th

lever

11

Machine damage

12th

Paddock

13

Rest position

14

Curve branch

15

Security position

16

Locking device

F

force

H

Lever arm

Claims (6)

1. Security device on rotary printing presses with a shaft (4) mounted in side frames running parallel to a cylindrical component (1), a protection (3, 3', 3'') arranged thereon and a control cam (2) with at least one coordinated limit switch (5) and a spring-loaded latching unit (16), characterised in that the control cam (2) fixed on the shaft (4) in engagement with the spring-loaded latching unit (16) has an electrically securable first latching position (13) for the protection (3) and a second latching position (13) for the protection (3') and on a neighbouring cam lobe (14) an electrically secured safety position (15) for the protection (3''), wherein the control cam (2) has a law of movement which, in the first and second latch positions (13) for the protection (3, 3') with applied force (F), the latching device (16) has a lever arm (h) = 0 and after overwhelming the pivot point, the second latching position (13) neighbouring the cam lobe (14) to achieve the security position (15) for the protection (3'') has an increasing force of the latching unit (16) with decreasing lever arm (h).
2. Security device according to Claim 1, characterised in that in the first and second latching positions (13) and in the security position (15), the force acting at the protection on the finger/hand is relatively constant.
3. Security device according to Claim 1 and 2, characterised in that the protection (3 to 3'') is connected via a link (12) with a press protector (11).
4. Security device according to Claim 1 and 2, characterised in that in the first latching position (13) for the protection (3), this is a sheet guiding unit for printing operation.
5. Security device according to Claim 1 and 2, characterized in that in the second latching position (13) for the protection (3'), the press is controlled in inching operation/creeping.
6. Security device according to Claim 1, characterized in that the latching device (16) is returnable under spring loading from the security position (15) for the protection (3'') into the neighbouring second latching position (13).

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