JP3373193B2 - Drivable sheet holding mechanism for sheet transport cylinder in rotary printing press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet holding mechanism in which number of members for a transmission device is decreased and opening and closing movements of the sheet holding mechanism can be performed by a little force in relation to the sheet holding mechanism which can be driven for a sheet carrying cylinder in a rotary press. SOLUTION: A sheet holding mechanism at least comprises a number of hooks 2 provided on a hooking shaft 3 and corresponding hooking bases 1 and a cam 4 is fixed on the end face side of the hooking shaft 3 and the cam is linked with a roller provided on a roller lever 6. In this case, the roller lever 6 as well as another roller lever 15 with a roller 10 are supported on a fixed rotational bearing 7 and the roller 10 is worked and bound with a control cam 11.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The invention relates to a drivable sheet holding mechanism for a sheet transport cylinder of a rotary printing press, as described in the main claim and the dependent claims. is there.

[0002]

BACKGROUND OF THE INVENTION A drivable sheet-holding mechanism of the same type is known from DE 43 29 388. The gripper shaft is provided with a gripper shaft lever, which has a cam roller at its end. A cam roller biased to act by a tension spring is paired with a cam curve.
In this case, the cam curve is incorporated on the end face side in the roller lever, and the cam roller projects into the cam curve to form a cam mechanism in the roller lever. The roller lever has a center of rotation and further rollers on the side remote from the cam curve, which roller is paired with the control cam. In addition, the roller lever is operatively connected to a pressure spring that moves the roller on the control cam while biasing the roller by the spring.

A further drive for a sheet holding mechanism is known from DE 197 52 550.
In this device, a gripper adjusting transmission device including a toggle lever, a connecting rod and a gripper shaft driving device lever for adjusting the gripper driving force, a control cam,
A series transmission consisting of a cam roller, a roller lever and a further connecting rod is provided. The roller lever and the further connecting rod form a double crank arrangement which is provided near the toggle lever position when the gripper is closed and under pressure. This requires only a small drive moment. The series transmission is in this case provided in front of the gripper adjusting transmission.

[0004]

The object of the present invention is to eliminate the above disadvantages in a sheet holding mechanism of the kind described above, and in particular to reduce the number of members of the transmission device to hold the sheet. It is an object of the present invention to provide a mechanism for performing opening and closing movements of the mechanism with a small force.

According to the invention, the problem is solved by the features of the constructions defined in the main and dependent claims.
Further configurations are described in the subclaims.

A first advantage is that the cam is fixed to a rotatable gripping shaft of a sheet transport cylinder having at least one sheet holding mechanism, the cam being a slide provided on a rotatable lever. The point is that the cam engaging portion is formed by being operatively connected to an engaging member such as a segment. The lever is preferably a roller lever and the engagement member is a roller bearing on this roller lever. The cam is combined with the engaging member or the roller while being biased by a torsion spring provided on the grip shaft.

The use of cam engagements to form the drive of the sheet holding mechanism has the advantage that transmission members such as cams, engagement members or rollers are easily separable in the contact position. . For example, when assembling or disassembling the sheet holding mechanism, the drive adjusting device (engaging member /
The rollers, roller levers, swivel bearings, etc.) remain on the sheet transport cylinder while the cam-fixed gripper shaft can be easily replaced. Alternatively, only the cam can be separated from the gripper shaft.

The cam preferably represents a projection which is oriented approximately in the axial direction of the sheet transport cylinder. The protrusion is associated with the engagement member / roller under the proper force.

In the sheet holding mechanism driving device, it is also advantageous that at least the cam engaging portion forms the contact position so that the play of the engaging portion is reduced, thereby increasing the rigidity of the transmission.

A further advantage is that the cam requires little construction space. The sheet-holding mechanism that can be driven thereby can be universally used for sheet-feeding cylinders of equal size or of multiple size (for a plate cylinder of equal size).

The force generated at the contact position between the cam of the sheet holding mechanism and the engaging member / roller is preferably small. This point is particularly suitable when the drivable sheet holding mechanism is used in a sheet transport cylinder formed as a return cylinder. The reason is that the reaction force of the return cylinder provided on the gripper shaft on the swing shaft is reduced.

It is also advantageous that the drivable sheet holding mechanism can be used not only on conventional sheet transport cylinders (contact cylinders, transfer cylinders or impression cylinders) but also on return cylinders. These return cylinders are optionally used for front-side printing or double-sided printing, and the sheet is turned over according to the trailing edge turning principle. Such a return drum has a large number of drivable sheet holding mechanisms inside the sheet holding mechanism. The drivable sheet holding mechanism according to the invention is in this case a double-sided printing device comprising a suction mechanism or a further drivable sheet holding mechanism according to the invention,
Alternatively, it can be used with a double-sided printing device with a drivable sheet holding mechanism and a suction mechanism according to the invention.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in more detail based on the embodiments.

The multi-color rotary offset printing press has a large number of printing devices arranged in rows. As is well known, each printing device has a plate cylinder 23, a transfer cylinder 22, and a sheet transport cylinder 18 of double size, which in the figure is formed as an impression cylinder. The inking device and dampening device will not be described in further detail here.

A sheet transport cylinder 18 is also provided between the printing devices for transporting the sheets in the delivery direction. This sheet transport cylinder is designed, for example, as a return cylinder or a transfer cylinder on the principle of a single drum. As is well known, the sheet transport cylinder 18 is provided with a sheet guide device.

In this embodiment, assuming that the size of the plate cylinder / transfer cylinders 23 and 22 is 1, all the sheet conveying cylinders 18 are formed to have a double size. That is, each sheet transport cylinder 18
Are two sheet holding mechanisms 2 provided to face each other on the circumference.
Has 0. If the sheet transport cylinder 18 is designed as an impression cylinder or a transfer cylinder, each sheet holding mechanism 20 has a gripper base 1, a gripper shaft 3 and a plurality of grippers provided to it. Is formed as. In that case,
The gripper shaft 3 is driven via a gripper adjusting transmission.

If the double-sized sheet transport cylinder 18 is formed as a return cylinder (preferably as a single drum return by the trailing edge return principle), each sheet holding unit 20 comprises a plurality of sheets. It is formed by a sheet holding machine.
These sheet-holding machines are formed, for example, as a suction device 21, a first gripping mechanism 24 (reverse side printing gripping mechanism) and a second gripping mechanism 25 (front side printing gripping mechanism). In this case as well, the sheet holding unit 20 is
It is provided on a sheet transport cylinder 18 which is offset by 80 degrees and formed as a return cylinder.

In particular, the gripping mechanisms 24 and 25 and the suction mechanism 2
1 each constitutes a sheet holding mechanism, which can be driven by an adjusting transmission.

In the first embodiment, each gripping mechanism 24, 25 as a sheet holding mechanism comprises a gripping shaft 3 having a large number of grippers. A torsion spring 16 is provided to the hollow holding shaft 3 by a known method. A gripper 1 is provided at the grip, especially at the tip of the grip. The gripper shaft 3 and the gripper base 1 are supported by a large number of holding members 19 provided at a distance in the axial direction with respect to the gripper shaft 3. These holding members 19 are fixed to the swing shaft 5, and the swing shaft 5 serves as the sheet transport cylinder 1.
A bearing member 17 fixed to the shaft 8 is rotatably supported.

The cam 4 is fixed to the grip shaft 3 and is preferably provided so as to be separably connected thereto. The end surface side of the cam 4 is preferably provided on the gripper shaft 3. The cam 4 engages with the roller 12 (engagement member) at the contact position 13, and the roller is provided on the roller lever 6. The roller lever 6 is
A rotary lever 7 is fixedly mounted on the sheet transport cylinder 18, and a roller lever 15 having a roller 10 is supported on the rotary bearing. Roller 10
Is operatively connected to the control cam 11 for driving the gripper adjuster. Cam 4 and (roller lever 6
The roller 12 thus forms a three-member cam transmission, and the contact position 13 is a cam engagement portion (that is, a roller engagement portion). The roller lever 6 and the roller lever 15 constitute a three-element member having three rotating members including a rotating roller 12 (bearing on the rotating bearing 7), a rotating bearing 7, and a roller 10.

As another form, the cam engaging portion (here, the sliding engaging portion) at the contact position 13 can be formed by using the cam 4 and preferably a cam-shaped sliding segment as the engaging member. Such an engaging member is fixed to the lever 6, which is otherwise formed as a roller lever 6. Other configurations of the transmission are consistent with further features according to the embodiments.

In a further embodiment (FIG. 1), the drivable sheet holding mechanism comprises a series transmission. This configuration is advantageous, for example, when the sheet holding mechanism has unfavorable position conditions and / or unfavorable load conditions.
The sheet holding mechanism comprises at least a number of grippers 2 provided on a gripper shaft 3 (having a torsion spring 16) and corresponding grippers 1. A cam 4 is preferably fixed to the end surface side of the gripper shaft 3 and preferably provided in a separable manner. When the cam 4 is in the contact position 13, the roller lever 6
Roller 12 or a sliding segment with lever 6 is engaged by the action of a spring. The lever / roller lever 6 is mounted on a rotary bearing 7 fixed together with the first swing member 8. The lever / roller lever 6 and the first swinging member 8 include a roller 12 or an engaging member (sliding segment), a rotary bearing 7, and a rotary joint 27.
And a three-element member having three pivot joints. Rotating joint 27
The end face side of is attached to the first swing member 8.

The sheet conveying cylinder 18 is further provided with a rotary bearing 9 fixedly. A roller lever 15 having a roller 10 engaged with a control cam 11 and a second swing member 8 are supported by the rotary bearing 9. The swing member 8 has a rotary joint 26 on the end face side. The two rocking members 8 are connected to the connecting rod 14 by turning joints 26 and 27. The roller lever 15 and the second oscillating member 8 have three rotary joints (rotatably supported by the rotary bearing 9) 3 including a roller 10, a rotary bearing 9 and a rotary joint 26. It constitutes an element member.

As described above, the four-element transmission mechanism (members 7, 27, 26, 9) extends from the rotary bearing 7 as the serial transmission device, and the rotary bearing is fixedly provided on the sheet conveying cylinder 18. It has reached 9.

In the two embodiments, the cam 4 preferably has a projection, which has a suitable force acting substantially in the axial direction of the sheet transport cylinder 18, for example via a torsion spring 16. In this state, the roller 12 or the engaging member is connected.

In a further embodiment, the sheet transport cylinder 1
A spring (not shown) supported by the roller lever 15
, The roller 10 is more reliably brought into contact with the control cam 11 by this spring.

In this case, according to the present invention, the sheet holding mechanism which can be driven by using the cam engaging portion can be used as the gripping mechanism 24 for back printing and / or the gripping mechanism 25 for front printing. . When the sheet transport cylinder 18 is formed as a return cylinder, the center of the shaft of the roller 12 is preferably rotatable on the bearing member 17 provided when the gripper 2 is closed. It is provided so as to completely coincide with the swing shaft 5 (Fig. 1).

When the oscillating shaft 5 oscillates so as to abut / separate, no rotational movement occurs between the cam 4 and the roller 12. When the gripper 2 is opened, the center of the axis of the roller 12 moves away from the center of the axis of the rocking shaft 5 (FIG. 2).

When the gripper 2 is closed, the position of the roller 12 can alternatively be freely selected. In such a case, the protruding portion of the cam 4 is preferably formed as an arc with respect to the center of the axis of the swing shaft 5. Swing shaft 5
The roller 12 rolls on the protruding portion of the cam 4 when it swings so as to contact / separate, and the center of the shaft of the roller 12 is fixed to the sheet transporting cylinder 18.

In the case of forming the cam 4 having the projecting portion directed in the axial direction of the sheet transport cylinder 18, the holding motion of the gripper 2 is performed via the biased torsion spring 16 and the cam 4 is moved. The closing movement of the mouthpiece 2 is started.

Alternatively, the projection of the cam 4, and thus the contact position 13, may be provided on the side of the cam 4 remote from the axis of the sheet transport cylinder 18. The roller 12 moves the cam 4 with an appropriate force.
Abut. In this embodiment, the biased torsion spring 1
The closing movement of the gripper 2 is carried out via 6 and the opening movement of the gripper 2 is started via the cam 4. The roller 12 provided with the roller lever 6 can be replaced by a sliding segment as an engaging member provided with the lever 6.

[Brief description of drawings]

FIG. 1 is a schematic diagram (kinetic diagram) showing a drivable sheet holding mechanism having a series transmission.

FIG. 2 is a schematic view (movement diagram) showing a drivable sheet holding mechanism.

FIG. 3 is a perspective view showing a drivable sheet holding mechanism provided on the return cylinder.

FIG. 4 is a side view showing a sheet transport cylinder as a reversing device between two printing devices.

[Explanation of symbols]

1 gripper 2 mouth 3 gripper axis 4 cams 5 Swing shaft 6 lever / roller lever 7,9 Rotation bearing 8 Swing member 10, 12 rollers 11 control cam 13 Contact position 14 Connecting rod 15 Roller lever 16 torsion spring 17 Bearing member 18 sheet transport cylinder 19 Holding member 20 sheets holding unit 21 Suction device 22 Transfer cylinder 23 plate body 24,25 gripper mechanism 26,27 Pivot joint

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hans-Otto Haas Germany 63150 Heusenstamm Raipnitzstraße 12 (72) Inventor Jörg Aidm Germany 63165 Mülheim Louis-Raferato-Strasse 12 (72) Inventor Wolfgang Gibbish Germany 63755 Alzenau / Michelle Bach Spessartstraße 60 (72) Inventor Michael Valoscha Germany 64859 Eppelzhausen Sudetenstraße 6 (72) Inventor Paul-Ulrich Faust Germany 65197 Wisbaden Wolfer Strasse 6 (56) References JP-A-61-213155 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) B41F 21/10 B41F 21/05

Claims (8)

(57) [Claims] 1. A drivable sheet holding mechanism for a sheet transport cylinder of a rotary printing press, comprising a cam device for drivingly adjusting the sheet holding mechanism. In the paper holding mechanism, the sheet holding mechanism comprises a plurality of grippers (2) provided on at least a gripper shaft (3) and a gripper (1) corresponding to the gripper, and the gripper shaft (3 ) Is provided with a cam (4), and the cam forms a cam engaging portion at a contact position with an engaging member provided on the lever (6),
The lever (6) constitutes a three-element member together with a roller lever (15) provided with a roller (10), and a rotary bearing (7) fixedly provided on the sheet transport cylinder (18).
Journalled by the roller (10), said roller
A sheet holding mechanism which is in contact with (10) and is operatively connected to a control cam (11) for driving the gripper (2) . 2. A drivable sheet holding mechanism for a sheet transport cylinder of a rotary printing press, comprising a cam device for drivingly adjusting the sheet holding mechanism. In the paper holding mechanism, the sheet holding mechanism comprises at least a plurality of grippers (2) provided on the gripper shaft (3) and a gripper (1) corresponding to the gripper, and the gripper shaft (3 ) Is provided with a cam (4), and the cam forms a cam engaging portion at a contact position with an engaging member provided on the lever (6),
The lever (6) together with a swinging member (8) is a rotary bearing (7) fixedly provided on the sheet transport cylinder (18).
And a further rotary bearing (9) is fixedly provided on the sheet transport cylinder (18), and the rotary bearing (9) drives the gripper (2).
A further roller lever (15) with a roller (10) in contact with a control cam (11) for rotation and a further rocker member (8) are borne as a three element member, said two rocker members ( A drivable sheet holding mechanism, characterized in that 8) is connected by a connecting rod (14) and two pivot joints (26, 27). 3. The cam (4) has a projection which is oriented substantially in the direction of the sheet transport cylinder (18), the projection being
3. A drivable sheet-holding mechanism according to claim 1 or 2, characterized in that it is in contact with the roller (12) so as to properly transmit force. 4. The drivable sheet holding mechanism according to claim 1, wherein the cam (4) is fixed to the gripper shaft (3) at the end face side. 5. The center of the roller (12) overlaps the center of a rocking shaft (5) arranged on the gripper shaft (3) when the gripper (2) is closed,
3. Swing shaft (5) is rotatably mounted on a bearing member (17) in a sheet transport cylinder (18) formed as a return cylinder. The drivable sheet holding mechanism described. 6. The drivable sheet holding mechanism according to claim 1, wherein the cam (4) is provided on the gripper shaft (3) in a separable state. 7. The cam engagement portion is provided at the contact position (1).
3. The drivable sheet holding mechanism according to claim 1 or 2, characterized in that in (3) it comprises a cam (4) and a sliding member fixed to the lever (6). 8. The cam engagement portion has the contact position (1).
3. A drivable sheet holding mechanism according to claim 1 or 2, characterized in that in (3) it comprises a cam (4) and a roller (12) provided on the roller lever (6). .