DE3026694A1 - PRINT PRESS WITH A CYLINDER LOCKING MECHANISM - Google Patents

Description

description

The invention relates generally to sheet loading (sheet-fed) rotary printing presses and, in particular, a printing press with a cylinder locking mechanism to control the merging. ^ and moving apart of printing cylinders.

In the case of rotary presses with a sheet feed, it must be possible to interrupt the printing process if it is faulty Way, no sheet is fed, since continued operation of the machine would result in that to be applied to the paper sheet Color is applied to the printing cylinder so that when a sheet is subsequently fed, the image is printed on the reverse side of the sheet. This is particularly the case with offset press There is a problem where it is desirable not only to remove the blanket cylinder from the impression cylinder (impression cylinder) but also to separate the type cylinder from the blanket cylinder in order to create a continued Ink accumulates on the blanket cylinder and a transferred to avoid the same on a sheet of paper.

The separation of the cylinders is generally done in that they are rotatably mounted on a shaft, which in turn is held at an eccentric part in bearings in the machine frame. By turning the eccentric shaft or Shaft part in the machine frame, the cylinder can quickly and easily by a suitable mechanism around the required Measure to be separated. Not only is it important that the separation be in response to a signal from a sheet detector mechanism It must be done quickly and immediately, but it must also do this at an appropriate point in the cycle of operation take place before any printing has actually taken place. When to initiate printing and a sheet is fed, the cylinders are similarly required to be returned to a printing state so that printing can properly begin with the first sheet of paper. The separation process takes place

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by a latching mechanism (latching mechanism) / which works as a function of the operational sequence of the press and is precisely and easily adjustable Must be in order for different types of paper or plates to enable appropriate pressure for the printing process. Furthermore, the mechanism should be as simple as possible, a large one Wear life, a minimum of adjustments are required and have a reliable as well as accurate operation.

The object of the present invention is to provide a printing press improved in the above sense with a cylinder locking mechanism.

A printing press with a cylinder locking mechanism in the preamble is characterized to solve the problem mentioned type according to the invention by the features listed in the characterizing part of claim 1 and 6, respectively. Further characteristics result from the respective subclaims.

The present invention includes a simplified and improved cylinder locking mechanism for a printing press, in which the cylinder to be displaced by the locking mechanism is attached to an eccentric on the frame of the printing machine attached shaft is held. The shaft has a lever arm with which one end of a rocker arm or toggle linkage is connected is. The other end of the same is hinged to the machine frame and provided with two stop members, one each Link on each side of the pivot point. A cam disc will driven by suitable means on the press, such as by another cylinder, and moves a reciprocating oscillating one Push arm. The other end of the same has a pivotally attached member which is controlled by a control member, such as a solenoid, is selectively movable between alternative positions, in one position of the push arm with one of the stops on the Toggle link and in the other position with the other stop engages. The mutual engagement between the Push arm and a stop means that the toggle lever

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Rod rotates through the middle position to a position in which the lever arm on the eccentric shaft displaces the cylinder from a compression state. One driving the solenoid to the other Position causes the push arm / to engage the other stop to move the toggle linkage over center and thereby rotating the lever arm on the eccentric shaft to the other position so that the cylinder in the print position is moved.

The correct timing results from the position of the cam disk , so that the push arm pulls the toggle linkage out of the OFF or ON pressure positions at the correct times. can snap through the middle position to the other position. Adjustable stops are provided to determine the cylinder spacing in the OFF printing position and the amount of pressure applied in the ON printing position. Furthermore, a fine adjustment is provided by using a tensioning member in one of the members of the toggle linkage, to be precise for adjusting the pressure during the printing process. Thus, a mere actuation of the solenoid to move the articulated end of the pusher element between alternative positions enables the respective operating state to be easily determined, namely whether the press is in the ON or OFF printing position as a function of suitable controls or monitoring elements, such as a sheet detector.

Accordingly, includes a cylinder latch mechanism for a printing press for selectively shifting a press cylinder eccentric mounting of the one cylinder into and out of a printing state with another press cylinder. The rocker arm or toggle linkage is connected to the eccentric bracket and has a pair of stops that are on both Sides of the fixed linkage. The reciprocating push arm operated in relation to time with the cylinders is optionally moved into engagement with one or the other stop to move the toggle linkage from one to the other to move the other side with respect to the center position and thereby one cylinder to or from the other cylinder move. - 8th -

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These and other objects and advantages of the invention will become apparent from the following description of a graphically illustrated preferred embodiment. They show: FIG. 1 - a fragmentary side view of a printing press with a cylinder locking mechanism according to the present invention in the ON printing position,

Figure 2 - in a fragmentary side view similar to Figure 1 the mechanism in the print OFF position; and Figures 3 to 5 - enlarged, fragmentary cross-sections along lines 3-3 / 4-4 and 5-5 of Figure 2.

According to Figure 1, an upright side frame 10 serves as a support for several cylinders of a printing press. It's on it point out that a similar support frame is provided on the opposite side of the cylinder and that other parts of the Press can be constructed in a manner known in the art. In the illustrated embodiment is a pressure cylinder (plate cylinder) 11 rotatable via suitable bearings mounted on a shaft 13 which, apart from the eccentric movement to be described below, is normally not rotatable is. The shaft 13 is fixed in the frame 10, namely by means of an eccentric end part 15 which is reduced in diameter and which is mounted in a frame 10 suitable bearing block 16 is rotatably mounted. The eccentric end portion 15 extends through the bearing and is connected to a suitable one Lever arm 17 connected in a non-rotatable manner.

A second cylinder, like a blanket or blanket cylinder (blanket cylinder) 20 is also attached to the frame 10, namely parallel to the printing cylinder 11 and at a distance therefrom. The blanket or blanket cylinder 20 is rotatable on a Shaft 21 fixed, which rotates in suitable bearings mounted in the frame 10 and protrudes outwardly from the frame, to carry a non-rotatably attached gear 23 in this area, which is connected to a drive chain 24 for rotating the ceiling or. Printing blanket cylinder 20 is engaged. An eccentric cam 25 is also rotatable inward of the gear 23

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firmly attached to the shaft 21, namely to actuate the still cylinder latching mechanism to be described in more detail. It should be noted that the printing cylinder 11 and the blanket cylinder 20 also wear interlocking gears so that the two cylinders move in the usual manner in opposite directions Rotate directions at the same speed (speed ratio 1: 1).

Since the blanket cylinder 2 0 and its shaft 21 in the frame are suitably mounted, there is no shifting of the center of this roller. However, since the pressure cylinder 11 via the eccentric End part 15 is attached instead of over the main area of the shaft 13 with respect to the frame, constitutes a means of Lever arm 17 rotating this eccentric end portion 15 moving the printing cylinder 11 to and from the blanket cylinder 20. This shift takes place between the ON printing position shown in FIG. 1 and that shown in FIG OFF printing position in which a separation or gap is created at 26.

Moving the lever arm 17 between the AUS and EIK print positions takes place by means of a rocker arm linkage 28 which is articulated at 31 on the outer end of the lever arm 17 has upper link 29. A lower link 33 is hinged at 34 to the lower end of the upper link 29 and to its lower end End pivotally connected to a pivot point 36 fixed on the frame 10. The articulation at 34 can be done with a handle 35 for manual operation of the rocker arm linkage 28 between the two positions. The upper link 29 is by means of a tensioner-like portion 41, which with opposite Threads in the upper end 38 and lower end 39 of the upper link 29 is in engagement, adjustable in length. Appropriate lock nuts 42 and 43 engage the faces of the upper and lower ends 38 and 39 to provide the tensioner section 41 to be clamped securely at the desired length, as will be explained in more detail.

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The lever arm 17 is constantly biased clockwise, that is, pointing away from the straight or locked toggle lever position. This is done by means of a tension-tensioning coil spring 45, which at one end with the outer region of the lever arm 17 and at the other end with a bolt fixed to the frame 10 46 is connected.

The movement of the toggle linkage 28 to each The side of the central position is limited by adjustable stops "for precise determination and adjustment of the Printing cylinder 11 in the ON and OFF printing positions. In the Figure 2 shown OFF print position is by a stop or. Stop mechanism determined, which can come into engagement with the upper end of the lower link 33. To that end is "A block 43 is attached to the frame 10 by any suitable means such as cap screws 49. The block 48 carries an adjustable stop screw 50 secured by a lock nut 51 is positionally fixed. The location of the much more critical ON printing position is determined by two separate stops certainly. According to the illustration in Figure 1, a toggle lever adjustment stop is formed by a block 53 which has an elongated Has slot 54 and is clamped in position in the frame 10 by means of a suitable cover or head screw 55 is. This stop does not normally require any adjustment and is used to limit the maximum position of the toggle lever. Rocker arm linkage in the ON pressure position of the cylinder to avoid excessive pressure being applied to the central position of the toggle lever or rocker arm linkage 28 could occur if the OFF pressure position with too large of the central position groundbreaking movement of the toggle linkage. The main stop for the ON print position becomes formed by a stop block 58 attached to the ON push position of the lever arm 17 and attached to the frame 10 by suitable means, such as cover or head screws 59, is attached. A stop screw 60 is screwed into the stop block 58 and through a suitable locking nut 61 positionally fixed. Thus, by adjusting the tensioner section 41 of the upper toggle link 29 and the connection

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impact screw 60, the ON printing position of the printing cylinder 11 can be set with great accuracy.

The operation of the cylinder locking mechanism to shift the toggle linkage 28 between the two positions is formed by the operation of the cam plate 25 attached to the shaft 21. A slide rod 65 is in a means Cover or head screws 67 attached to the frame 10 guide block 66 slidably mounted for movement to and from the axis of shaft 21. At its inner end the slide rod 65 carries an eccentric roller 69 for engagement with the cam disk 25. The slide rod 65 is in the direction biased to the cam disk 25 by a suitable biasing spring 71 which has one end attached to a bolt 72 on the Slide rod 65 and is attached at its other end to a protruding ear 73 on the guide block 66. At the other end a push rod or push rod 75 is pivotably attached to the slide rod 65 by means of a pivot pin 76. The push rod 75 is provided with upper and lower shoulder surfaces 78, 79 on either side of a central protrusion 81. The lower Toggle link 33 is provided with a pair of projecting bolts 83 and 84 are formed on the upper and lower sides of the pivot point 36. The central projection 81 on the push rod 75 moves between the bolts 83 and 84, vim to limit the position of the push rod as it rotates about the pivot bolt 76. The projection 81 moves against one or the other bolt 83 or 84, depending on whether the Push rod 75 is in a position to move the locking mechanism to the print OFF position, or in a Position to move it to the ON printing position.

This is done by means of a solenoid 86 that is located under the push rod 75 is positioned on a holding arm 87. The solenoid 86 has a suitable armature or plunger 89 with which a linkage is connected, which consists of a pair of side rods 91 (see Figure 4}, which are located on each side of the push rod 75 extend. The side rods 91 are attached to the solenoid plunger 89 by a pivot pin and a bushing 92 and to the top

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Ren end set by a pivot bushing 93. The distance between the sockets 92 and 93 corresponds essentially to the width of the push rod 75, so that an upward or downward Movement of plunger 89 results in positioning of the push rod such that either the lower shoulder surface 79 with the lower bolt 84 or the upper shoulder surface 78 engages the upper bolt 83. While that Solenoid for engaging the shoulder surface 79 with the If bolt 84 only works in a downward direction, the lower bush 92 is provided with a projection 95. There is one on this one Tension spring 96 attached, which is connected at its upper end to a bolt 97 attached to the frame 10. Thus, the Tension spring 96 for a constant biasing of the plunger 89 to the upper position in which the upper shoulder surface 78 is with the upper bolt 83 is engaged.

• It can thus be seen that the fact that the printing cylinder 11 j.n is in the OFF or ON print position, only depends on the energized state of the solenoid 86. When it is excited, the blanket cylinder rotates 20 and the cam disk 25 by less than one revolution to move the linkage to the desired position. When the press device is in the ON pressure position shown in Figure 1, de-energization of the solenoid 86 will result to an upward movement of the plunger 89 under the influence of the biasing force of the tension spring 96. When the slide rod 65 on the low point on the cam 25 is withdrawn, the push rod 75 is withdrawn to the right until it can move to the fully up position where the upper shoulder surface 78 engages the upper Bolt 83 is located on the lower toggle link 33. When the slide rod 65 is then pushed by the cam 25 to the left is, the push rod 75 rotates the lower toggle link 33 counterclockwise until it is through the action of the biasing Helical spring 45 snaps beyond the center or the middle position to the position from FIG. 2 in which the lower Member 33 is engaged with the stop screw 50. As long as the solenoid 86 remains de-energized, the push rod continues

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the oscillation or oscillation process in the uppermost position continues / moving the upper shoulder surface 78 to and from the upper bolt 83. When initiating printing is desired and a sheet of paper is fed to the appropriate position, the sheet detector provides for energization of the solenoid 86. This causes the push rod 75 to move to a downward position so that when the slide rod 6 5 is retracted to the right to the low point of the cam disk 25, the central projection 81 with the lower bolt 84 engages. When slide rod 65 and push rod 75 then move to the left, will the lower bolt 84 detected by the shoulder surface 79, whereby the lower link 33 is rotated clockwise until the rocker arm or toggle linkage 28 is over the center or the center position is moved to the ON print position shown in FIG.

It should be noted that the movement of the toggle linkage 28 is unequal on either side of the center position. The movement in the OFF print position is much greater than in this position provide a sufficient clearance or gap at 26. The movement to the EIN print position shown in Figure 1 is only sufficient to lock or move the toggle linkage against the stop or block 53, as one excessive movement in that direction creates excessive momentary pressure between cylinders 11 and 20 at the center position of the toggle linkage 28 could justify.

While a preferred embodiment of the present invention Is shown and described, it should be noted that various modifications and redesigns within the scope of the invention can be made of parts.

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Claims (12)

WHITE CONSOLIDATED INDUSTRIES, INC., 11770 Berea Road, Cleveland, Ohio 44111, USA Printing press with a cylinder locking mechanism 1. Printing press with a cylinder locking mechanism, featured by a frame (10), by a first cylinder (20) rotatably mounted thereon, by a second Cylinder (11) by eccentric ones held on the frame (10) Means (13, 15) for rotatably mounting the second cylinder (11) parallel to the first cylinder (20) and below Distance therefrom, the eccentric means (13, 15) being rotatable about an axis which is parallel to the axis of rotation of the second Cylinder and at a distance therefrom, whereby a rotation of the eccentric means (13, 15) in one direction a displacement of the second cylinder (11) in the direction of first cylinder (20) and rotating the eccentric means (13, 15) in the other direction to one of the first cylinder (20) lead away moving the second cylinder (11), through a fixed linkage (36) on the frame (10), by a toggle linkage (28), one of which is a link (33) is connected to the fixed linkage (36) and its other link (29) to the eccentric means (13, 15) is connected, by first .and second stops (83, 84) on the toggle linkage (28), by one to and from the stops (83, 84) reciprocable push arm (75), which is optionally connected to the first or second stop (83, 84) in Can be engaged, and by selection means (86) which can be brought into a state to the push arm (75) cause one of the stops (83, 84) to engage / thus the toggle linkage (28) in one direction displaced and thereby the eccentric means (13, 15) are rotated in one direction, and the selection means 0 3 00 BiHf-O 9 2 0. tel (86) can be brought into a second state in order to to cause the push arm (75) to engage the other of the stops (83, 84), thereby engaging the toggle linkage (28) displaced in the other direction and the eccentric means (13, 15) rotated in the other direction will. 2. Printing press according to claim 1, characterized in that the Selector means include a solenoid (86) which, when energized, displaces the push arm (75) in response to one of the stops (83, 84) to come into engagement, and a spring (96) which, when the solenoid (86) is de-energized, the push arm (75) moves to come into engagement with the other of the stops (83, 84). 3. Printing press according to claim 1, characterized by adjustable stop means (50, 53, 60) for limiting the movement of the Toggle linkage (28) in one direction and the other. 4. Printing press according to claim 3, characterized in that one of the toggle linkage (29) has an adjustable length. 5. Printing press according to claim 3, characterized in that one of the stop means (60) is attached to the frame (10) and engages the eccentric means (13, 15) can occur to limit the rotation of the same in one direction. 6. Printing press with a cylinder locking mechanism, characterized by a frame (10), by one on this rotatably mounted first cylinder (20), through a second cylinder (11), through eccentric ones held on the frame (10) Means (13, 15) for rotatably mounting the second cylinder (11) parallel to the first cylinder (20) and below Distance therefrom, the eccentric means (13, 15) being rotatable about an axis which is parallel to the axis of rotation of the second Cylinder (11) and at a distance therefrom, whereby a rotation of the eccentric means (13, 15) in a - 3 030067/0720 Direction to a displacement of the second cylinder (11) in Direction towards the first cylinder (20) and rotating the eccentric means (13, 15) in the other direction towards one lead away from the first cylinder (20) moving the second cylinder (11) by a lever arm (17) the eccentric means (13, 15), by a fixed articulation (36) on the frame (10), by a rocker arm or toggle linkage (28), one link (33) with the fixed linkage (36) and the other link (29) with the lever arm (17) are connected by a first stop (83) on the one toggle lever member (33) on one side of the fixed articulation (36), through a second stop (84) on one toggle link (33) on the other side of the fixed linkage (36), through a rotatable cam disk (25), through one of the cam disk (25) to and from the fixed linkage (36) reciprocating push arm (75), which can be optionally connected to the first stop (83) or the second stop (84) can be engaged, and by selection means (36) which can be brought into an operating state, around the push arm (75) to cause one of the stops (83, 84) to engage so that the toggle linkage (28) in a Direction shifted and the eccentric means (13, 15) are rotated in one direction, and wherein the selection means (86) can be brought into a second operating state in order to cause the push arm (75) with the other of the stops (83, 84) to engage so that the toggle linkage (28) is moved in the other direction and the eccentric means (13, 15) are rotated in the other direction. 7. Printing press according to claim 6, characterized in that the eccentric means a second cylinder (11) rotatable attaching shaft (13) and an eccentric projection (15) on the shaft (13) rotatably held in the frame (10) exhibit. 8. Printing press according to claim 6, characterized by first stop means (50) connected to one toggle link (33) in 030067/0720 Intervention can occur in order to move in one direction to limit, and by a second stop means (53) which with the one toggle lever member (33) in engagement can kick to limit movement in the other direction. 9. Printing press according to claim 8, characterized in that the other toggle lever member (29) is adjustable in length. 10. Printing press according to claim 9, characterized by a third Stop means (60) which can come into engagement with the lever arm (17) for its rotational movement in one direction to limit. 11. Printing press according to / mspruch 6, characterized by one of the rotatable cam disk (25) reciprocating slide rod (65) on which the push arm (75) is pivotably attached is. 12. Printing press according to claim 11, characterized in that the selection means includes a spring (96) supporting the pushers (75) biased in one direction to match one of the stops (83, 84) to engage and a solenoid (86) operable to engage the push arm (75) in one direction for engagement with the other of the stops (83, 84). - 5 _ 030067/0720