EP0930972B1 - Plate removing device - Google Patents

Abstract

In a device for removing plates from a cylinder of a rotary printing press a folded end (3,4) must be separated from the cylinder (1) using simple technical means. According to the invention, A swivelling spindle (18) disposed in the cylinder (1) has adjacent projections (21) extending in the axial direction and having an elastic effect in the radial direction of the spindle on the following end of the plate (9).

Description

The invention relates to a device for solving Plates from a cylinder of a rotary printing press according to the preamble of claim 1.

DE 43 03 381 A1 includes a plate cylinder a device for lifting a printing plate known. The plate cylinder points to this compressed air can be applied below the pressure plate Holes for lifting the pressure plate.

The disadvantage of this plate cylinder is that it is complex Compressed air supplies are necessary.

DE 44 15 622 A1 describes a device for Attach a plate to a plate cylinder. there is a shaft with centrifugal bodies for clamping and a push-out edge is provided for releasing the plate.

DE 195 09 562 C1 shows a device for releasing of plates from a cylinder one Rotary printing machine by means of a sheet Lifter.

The invention has for its object a Device for releasing plates with bent ends from a cylinder of a rotary printing press create with the at least one folded end of the Plate can be detached from the cylinder.

This object is achieved by the features of the characterizing part of claim 1 solved.

The advantages that can be achieved with the invention exist especially in that the loosening of a beveled End of the plate from the surface of the plate cylinder using a known simple clamping device he follows. The known clamping device consists of a swiveling spindle, which on its circumference on the trailing end of the plate hook or invention Has projections. That as a result of turning the spindle of end of the surface of the plate cylinder Plate can thus without further aids, e.g. B. from the axial slot of the cylinder. Furthermore, there are no parts outside the cylinder arranged or do not occur over the lateral surface of the Cylinders out. The hooks of the invention Device move inside the the ends of the Plate receiving slot or in a groove of Spindle. So there is no additional space for the Device according to the invention in the area of the lateral surface of the cylinder needed. One for the plate maximum printable area remains and will not reduced by the fact that z. B. in the lateral surface of the Cylinder bores or movable strips are arranged are.

An embodiment of the invention is in the Drawing shown and is closer below described.

Fig. 1

eine schematische Darstellung eines Querschnittes durch eine erfindungsgemäße Vorrichtung in Klemmposition;

Fig. 2

eine Einzelheit "Z" nach Fig. 1 mit einer vergrößerten Darstellung eines Hakens in Klemmposition;

Fig. 3

eine entsprechende Darstellung nach Fig. 2 mit einem Haken in Löseposition;

Fig. 4

eine Ansicht A nach Fig. 2 auf eine Hakenleiste, jedoch ohne Darstellung der abgekanteten Schenkel der Platte;

Fig. 5

eine Ansicht H nach Fig. 2 in einer weiteren Ausführungsvariante.

Show it

Fig. 1

a schematic representation of a cross section through a device according to the invention in the clamping position;

Fig. 2

a detail "Z" of Figure 1 with an enlarged view of a hook in the clamping position.

Fig. 3

a corresponding representation of Figure 2 with a hook in the release position.

Fig. 4

a view A of Figure 2 on a hook bar, but without showing the bent leg of the plate.

Fig. 5

a view H of FIG. 2 in a further embodiment.

A cylinder 1 of a rotary printing press is for Inclusion of flexible plates 2 with bent ends 3, 4 with at least one parallel to its axis of rotation extending, from a lateral surface 6 of the Cylinder 1 in its interior 7 extending, narrow Provide slot 8 (= insertion slot 8).

In the plate 2 with the thickness d2, z. B. d2 = 0.2 to 0.3 mm, it is preferably printing plates or carrier plates with z. B. attached to it Blankets 9. One leg 11 of the leading end 3 is longer than one in the present example corresponding leg 12 of the trailing end 4 of the Plate 2.

The slot 8 is preferably rectangular in cross section educated. A width b8 of the cross section of the Slot 8 has at its beginning 13 slightly more than that twice the thickness d2 of the plate 2, i.e. H. for example b8 = 1 millimeter. The slot 8 is with respect to the outer surface 6 in the area of Slot 8 adjacent tangent 14 to one Tilt angle alpha, e.g. B. Alpha = 45 °. The Slot 8 opens into a parallel to slot 8 running recess 16. The recess 16 has the Form of a bore 16. The bore 16 is with the Slot 8 in connection. In this bore 16 is a its longitudinal axis 17 pivotable lever 18 or pivotable holder 18 or spindle 18 arranged. in the present embodiment is one with a known drive provided spindle 18 is used.

The spindle 18 is with a radius r18, z. B. r18 = 15 mm, swiveling and centric stored.

This spindle 18 has an in on its circumference 19 axial and radial direction (or along a Secant) of the spindle 18 extending groove 23 with z. B. rectangular cross section. In this groove 23 is at least one plate-wide extension bar 22 or more short extension bars 22 per Plate width arranged. These extension bars 22 are in the middle and lower part of their cross section the groove 23 adapted so that it moves well radially in it can be and have the slot 8th facing one or more in axially parallel direction extending from each other spaced axially elongated projections 21 or hooks 21 on. These hooks 21 have a length c of z. B. 60 mm or 10 mm at a distance e of z. B. 10 mm from each other.

In the bottom surface 24 of the groove 23 are in spaced from each other in the axial direction Blind holes 26, in each of which a compression spring 27 is arranged. Each compression spring 27 supports the bottom the blind hole 26, its force application point acts in the radial or parallel direction of the spindle 18 against the bottom surface near the bottom 28 of the Extension bar 22. The projections 21 during the clamping position of the plate 2 with at least its front edge 29 against that in the slot 8 inserted leg 12; 11 pressed, causing the Leg 11; 12 against the cylinder 1 can be set (Figs. 1 and 2).

Should a plate 2 located on the cylinder 1 be released be, the spindle 18 is towards the ends of the folded leg 11; 12, e.g. B. contrary to Clockwise direction of rotation until the End face 15 of the projections 21 as a result of Spring action in at the end of the leg 12 of the trailing end 4 located recesses 31 with engage the end face 10 or on the end face 5 attack at the end 20, 34 of the trailing leg 12. Each projection 21 is one, for example rectangular, recess 31 in the leg end 20, 34 assigned if the plate end is perforated.

The projections 21 with the push-out surfaces 15 each engage an upper edge 32 with the End face 10 of the recesses 31 or the end 20, 34 with the end face 5 of the shortened leg 12. By the rotation of the spindle 18 - in the embodiment - in Clockwise direction of rotation is now the trailing end 4 of the plate 2 in the direction of the beginning 13 of the slot 8 pushed so far until due to the rotary movement of the Spindle 18 the leading edges 29 / push-out surface 15 of the Projections 21 with the edges 32 / end faces 10 of the Recesses 31 or the end 20, 34 with the end face 5 of the shortened leg 12 comes out of engagement. The trailing end 4 is so far in the Slot 8 moves and the end 4 of the plate 2 as far from the lateral surface 6 of the cylinder 1 lifted that the Plate 2 now by hand or by means of devices can be easily removed.

The extension bar 22 can be in by the spring force radial direction of the groove 23 are moved until them with part of their periphery 33 against one spindle-fixed stop 36 in the groove 23.

By rotating the spindle 18 - in Exemplary embodiment - in the clockwise direction of rotation the projections 21 within the bore 16 and below the beginning of the slot 13 in a plate insertion position brought (not shown). Between the clamping position and the insertion position of the spindle 18 ranges, for. B. a Angle of rotation Beta = 45 ° off.

The projections 21 of the extension bar 22 can - in seen in the axial direction - continuously or from each other be spaced.

A plurality of shorter push-out strips 22 can be provided in the groove 23, which are arranged axially directly next to one another or spaced apart from one another.
When the extension bars 22 are spaced apart, a plurality of clamping pieces G are provided in the axial direction. Extending strips 22 with projections or hooks 21 are then arranged between them.

The cross section of the clamping pieces G can be any z. B. rectangular, circular, rectangular-round star or in the form of a stepped half disc, etc.

The number of extension bars 22 with hooks 21 is less than the number of clamping pieces G, e.g. B. one too two to one to four. Extension bars 22 and Clamping pieces G can have the same length, e.g. B. of 60 mm exhibit.

Extension bars 22 with hooks or projections 21 and Clamping pieces G are in the groove 23 in a radial or secantial direction of the spindle 18 resiliently mounted, see above as shown in Fig. 1. While the pieces G for permanent clamping of the two legs 11; 12 against the slot 8 laterally delimiting wall of the Ensure cylinder 1, reach behind with hook 21 provided extension bars 22 when turning back the Spindle 18 in counterclockwise direction in recesses 31 of the leg 12 located edges 32 and End faces 10 (Fig. 3). By turning the spindle 18 in Opposite direction to the clamping direction, i.e. in Clockwise direction of rotation, the leg 12 of the plate 2 moved towards the beginning of the slot 13. So the end can 4 of the plate 2 are pulled out.

It is also possible that the hooked 21 Extension bars 22 behind the end 20, 34 on the End face 5 of a shortened leg 12 to grab. The corresponding hooks are then omitted or projections 21 associated recesses 31 in Thigh 12.

Opposite the projections 21 are z. B. in the upper part inside the groove 23, the stops 36 appropriate. They are contoured to the contour of the Hook 21 or the clamping pieces G adapted. You should a radial movement limitation of the hooks 21 or Form clamping pieces G in the direction of insertion slot 8. The upper part of the extension bar 22 with projections or Hook 21 has the cross section in the exemplary embodiment Shape of a step half disc.

LIST OF REFERENCE NUMBERS

1

cylinder

2

plate

3

End, leading (2)

4

End, trailing (2)

5

End face (34, 12)

6

Lateral surface (1)

7

Interior (1)

8th

Slot (1)

9

blanket

10

End face (31)

11

Leg (3) - leading end

12

Leg (4) - trailing end

13

Beginning (8)

14

Tangent (6)

15

Extension surface (21)

16

Bore (1)

17

Longitudinal axis (18)

18

Spindle, swiveling (17)

19

Scope (18)

20

End (12)

21

Hooks / Protrusions (22)

22

Ausschiebeleisten

23

Groove (48)

24

Base (23)

25

End face (21)

26

Blind hole (24)

27

Compression spring (26)

28

Underside (22)

29

Leading edge (21)

30

-

31

recess

32

Edge (31)

33

Periphery (22), pointing in the direction (8)

34

End (12)

35

-

36

attack

G

clamp

c

Length (21)

e

Distance (21)

d2

Thickness (2)

b8

Width (8)

r18

Radius (18)

alpha

Tilt angle (8)

beta

Rotation angle (18)

Claims (15)

1. Device for releasing plates (2) with turned-down, smooth ends (3, 4) from a cylinder (1) of a rotary printing machine, the cylinder (1) being provided with a narrow, axial insertion slot (8), which is connected to a recess (16) running in the axial direction, to accommodate the limbs (11; 12) of the turned-down ends (3; 4) of the plate (2), there being provided in the recess (16) a holder (18) which can be pivoted about its longitudinal axis (17) and has a number of sprung clamping pieces (G) that press against a turned-down edge (12) of the plate (2), and for the clamping pieces (G) being capable of movement in the radial direction of the holder (18), characterized in that all the clamping pieces (G) or some of the clamping pieces (G) have a protrusion (21) which can be brought into contact with an end face (5) of the end (20, 34) of a limb (12) to be pushed out or an end face (10), remote from the end of the limb, of an opening (31) in the end (20, 34) of the limb (12) to be pushed out.
2. Device for releasing plates (2) with turned-down, smooth ends (3, 4) from a cylinder (1) of a rotary printing machine, the cylinder (1) being provided with a narrow, axial insertion slot (8), which is connected to a recess (16) running in the axial direction, to accommodate the limbs (11; 12) of the turned-down ends (3; 4) of the plate (2), there being provided in the recess (16) a holder (18) which can be pivoted about its longitudinal axis (17) and has a number of sprung clamping pieces (G) that press against a turned-down edge (12) of the plate (2), and for the clamping pieces (G) being capable of movement in the radial direction of the holder (18), characterized in that apart from a number of clamping pieces (G) carrying out a pure clamping function, provision is additionally made for a number of sprung push-out strips (22) which carry out a pushing-out function and extend in the axial and radial or secant direction, in that the push-out strips (22) has [sic] a push-out face (15) which can be brought into contact with an end face (5) of the end (20, 34) of a limb (12) to be pushed out or an end face (10), remote from the end of the limb, of an opening (31) in the end (20, 34) of the limb (12) to be pushed out, and in that compression springs (27) are arranged between the push-out strip (22) and the holder (18).
3. Device according to Claims 1 to 2, characterized in that the holder (18) is designed as a spindle (18).
4. Device according to Claims 1 to 3, characterized in that the hooks or protrusions (21) are arranged on a push-out strip (22) extending in the axial direction.
5. Device according to Claims 1 to 4, characterized in that the push-out strip (22) is arranged in an axial groove (23) in the spindle (18).
6. Device according to Claims 1 to 5, characterized in that blind drilled holes (26) starting from the base of the groove (23) are provided in the radial direction of the holder (18) to accommodate compression springs (27) acting against the push-out strip (22) and/or clamping strip (G).
7. Device according to Claims 1 to 6, characterized in that the clamping strip (G) extends over the entire length of the groove (23).
8. Device according to Claims 1 to 5, characterized in that a number (n) of push-out strips (22) are provided in the groove (23).
9. Device according to Claims 1 to 8, characterized in that the clamping pieces (G) have a round cross section.
10. Device according to Claims 1 to 9, characterized in that the clamping pieces (G) have a a [sic] cross section like a stepped half-disc on the end face (25) of the clamping pieces (G) which faces the slot (8) (Fig. 1; Fig. 2).
11. Device according to Claims 1 to 10, characterized in that the push-out strips (22) have a square and/or rectangular cross section and/or, on the end face (25) of the push-out strips (22) which faces the slots (8), have a cross section like a stepped half-disc (Fig. 1; Fig. 2).
12. Device according to Claims 1 to 11, characterized in that a leading edge (29) of the protrusions (21) presses against the limbs (12) of the trailing end (4) during the operation of pushing out the turned-down limbs (11, 12).
13. Device according to Claims 1 to 12, characterized in that the leading edge (29) of the protrusions (21) acts against the end (34) of the limb (12) while the limb (12) is being pushed out.
14. Device according to Claims 1 to 13, characterized in that the leading edge (29) of the protrusions (21) acts against an end face (10) located in a recess (31) in the limb (12) while the limb (12) of the trailing end (4) is being pushed out.
15. Device according to Claims 1 to 14, characterized in that the push-out strip (22) has, in addition to the device (25) for pushing out a limb (12), a device (21) having a curvature for clamping the two limbs (11; 12).

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