JPH0753444B2 - Sheet gripper device of sheet-fed rotary printing press - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-fed gripper device for a sheet-fed rotary printing press, which sheet-gripper device comprises a gripper support and a sheet-fed gripper. The paper gripper has a gripper finger, and the gripper finger is fixedly connected to the gripper shaft,
When the gripper shaft pivots in the first direction, the tip of the gripper moves away from the gripper support, and when pivoting in the opposite second direction, it contacts the gripper support and pivots further in the second direction. A gripping force is generated on the gripper support, and the gripper finger has a head portion having the gripper tip;
It is composed of a driving foot portion and a leaf spring-like section that connects the head portion to the driving foot portion, and is directly non-rotatably connected to the gripper shaft at the driving foot portion, As an adjusting means, the gripper fingers are connected to the head portion of the gripper fingers by means of which corresponding counters, which cooperate with the adjusting screws, are provided on the driving feet.

[0002]

A sheet-fed gripper device of this type is known from DE-A-3644484. This sheet gripper device has the disadvantage that the movement of the tip of the gripper on the gripper support is only zero. This is because after the gripper is closed, when the so-called pressing is performed, an unfavorable pushing-off movement continues due to the bending of the gripper finger.

Published German patent application 3710
In the sheet gripper device known from the specification of U.S. Pat. No. 249, the tip of a leaf spring-shaped gripper is fixed at the lower end by means of a coupling part (screw) which can be decoupled from the gripper finger, while at the upper end. A movable element is arranged between the gripper tip and the gripper finger. This element, in one embodiment, is configured as a soft elastic intermediate layer which is a special form of leaf spring hinge. However, since the sheet gripper device is not provided with adjusting means, it is not possible to adjust the bias applied to the sheet gripper device.

German Patent Application Publication No. 3914
The gripper finger provided in the sheet gripper device known from DE 646 has a hinge point with an elastic return force, which hinge point is arranged near the addition of the gripper finger. Has been done. In this case, this hinge location is arranged on the line of the bond line formed between the center point of the gripper shaft and the front edge of the pressing surface of the gripper finger or on the side of this bond line facing the gripper finger. . In this case, the hinge location can also be designed as a spring section and has a so-called slit limiting wall which has an elastic cushion, e.g. hard rubber and plastic, which produces an elastic return force. A cushion consisting of and can be received. This certainly prevents any offset movement of the sheet gripper device in the gripper support, but
The bias of this sheet gripper device is not adjustable.
This is because no suitable adjusting means is provided. Inadequate bias results in the risk of a blunt gripper closure with an extended closing time and closing distance or the formation of an extended force when pressing the gripper fingers.

German Patent Publication No. 3130
The gripper fingers provided in the sheet gripper device known from U.S. Pat. No. 689 have stopper screws which act on the gripper support. However, since this stopper screw does not have elastic characteristics, elastic return action cannot be obtained in this case either. Such a stopper screw leads to an uncontrolled introduction of gripping action, which has the disadvantageous consequence of a correctly registered grip of the sheet.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is therefore to improve a sheet gripper device of the type mentioned at the outset, so that even after the gripper has been closed, an undesired shifting movement on the sheet is carried out. Is to be prevented.

[0007]

In order to solve this problem, in the arrangement according to the invention, the curved leaf-spring-like section of the gripper finger is provided with a decoupling connection near said gripper shaft. An elastic support member that is hard to wear is arranged on the side of the head portion of the gripper finger facing the gripper support, which is connected to the driving foot portion of the finger.

[0008]

The main advantage of the present invention resides in the precisely registered gripper closure, which takes place with a nearly shock-free closing movement. Even partial wear of the elastic support member does not have any adverse effect on the closing movement without displacement.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings.

The illustrated sheet gripper device comprises a sheet gripper 5, which cooperates with a gripper support 14.

Reference numeral 8 designates a sheet guide cylinder.

The sheet gripper has a gripper finger 2 which is immovably connected to a gripper shaft 1 and the gripper tip 4 of the gripper finger 2 has a gripper shaft 1 in a first direction. When turning, it moves in a direction away from the gripper support 14, contacts the gripper support 14 when the gripper shaft 1 turns in the opposite second direction, and when turning further (pressing) in the second direction, It creates a holding force for the gripper support 14. At this time, the pressing surface of the gripper tip 4 faces the gripper support 14.

The gripper tip 4 is supported by a head portion 16, and on the side of the head portion facing the gripper support 14, elastic support members 12 and 13 which are hard to wear are arranged. The support member is designed as a full support surface or as an individual support surface. In addition to the head portion 16 supporting the gripper tip 4, the gripper finger 2 comprises a driving foot portion 17 and a curved leaf spring-shaped section 3 connecting the head portion 16 to the driving foot portion 17. Made of Gripper fingers 2
The curved leaf-spring-like part 3 is connected to the entrainment foot 17 of the gripper finger 2 near the gripper shaft 1 by means of a deengageable joint 9, while this entrainment foot 17 is directly connected. It is coupled to the gripper shaft 1 so as not to rotate relative to it.

The gripper tip 4 is releasably or fixedly connected to the curved leaf spring section 3.

An adjusting screw 6 can be screwed into the head part 16 of the gripper finger 2 as an adjusting means, in order to allow the gripper finger 2 to be biased uniformly, which adjusting screw of the entrainment foot 17 is provided. Correspondence 18
It is guided by the long hole 7 provided in the. Carrying foot 17
Also has a slot 15 which allows the screw 10
It is possible to fix the entrainment foot 17 directly and immovably in the threaded hole of the gripper shaft 1 by means of.

The releasable connection between the leaf-spring-shaped section 3 of the gripper finger 2 and the drive foot 17 is likewise provided by a threaded connection 19.

The elastic support members 12, 13 have a support surface 12
And / or the supporting cylinder 13 and is made of a wear-resistant plastic, for example polyamide.
These support members are fixed to the head part 16 by means of a shape connection and / or material connection by means of gluing, injection moulding, etc. to a guide part, which is, for example, in the form of an ant.

The sheet gripper device according to the invention is not limited to the embodiment shown, but it is also possible to modify the details in a manner known per se, for example additionally with spring-elastic biasing. (Not shown).

The mode of operation of the gripper will be described below.

All gripper fingers 2, which are fixed side by side on the gripper shaft 1, are uniformly biased via screws 6. The gripper is screwed onto a gripper shaft 1, which grips the first gripper tip 4 against a sheet of paper 11 located on a gripper support 14 and, likewise, supports 12 and 13 from the side. It is swiveled until it abuts the gripper support. All grippers provided on the gripper shaft 1 are swiveled in the same way and the screw 1
It is fixed to the gripper shaft 1 at 0. When the gripper shaft is further rotated (pressed), the gripper finger 2
The curved leaf spring-shaped section 3 is bent. At the same time, the elastic support member exerts a restoring force (damping action) on the head portion of the gripper finger 2, so that the pressing surface of the gripper tip 4 is centered on the gripper support 14 without shifting. Such an operation is performed by the support member 1
It is maintained even if 2 and 13 are worn.

[Brief description of drawings]

1 is a sectional view of a sheet gripper device according to the present invention.

FIG. 2 is a side view of a support member provided on a head portion of a gripper finger, as viewed from a direction X.

FIG. 3 is a side view showing a modified form of a support member.

FIG. 4 is a side view showing another variation of the support member.

[Explanation of symbols]

 1 gripper shaft 2 gripper finger 3 classification 4 gripper tip 5 sheet paper gripper 6 screw 7 long hole 8 sheet paper guide cylinder 9 connection part 10 screw 11 sheet paper 12 support surface 13 support member 14 gripper support 15 long hole 16 head Part 17 Carrying foot 18 Corresponding receiver 19 Screw

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP 62-51448 (JP, A) JP 63-168355 (JP, A)

Claims (3)

[Claims] 1. A sheet gripper device for a sheet-fed rotary printing press, said sheet gripper device comprising a gripper support (14) and a sheet gripper (5). The paper gripper has a gripper finger (2), which is fixedly connected to the gripper shaft (1), and when the gripper shaft (1) pivots in the first direction, the gripper tip (4 ) Moves away from the gripper support (14) and contacts the gripper support (14) when pivoting in the opposite second direction,
Upon further pivoting in the second direction, it exerts a holding force on the gripper support (14) so that the gripper finger (2) is entrained with the head portion (16) having the gripper tip (4). It consists of a foot (17) and a leaf-spring-like section (3) connecting the head part (16) with the entrainment foot (17), which is directly on the entrainment foot (17). The entrainment foot, which is non-rotatably connected to the gripper shaft (1) and cooperates with the adjusting screw (6) on the head part (16) of the gripper finger (2) as adjusting means. In the type in which the corresponding receiver (18) provided in (17) is connected, the curved leaf-spring-like section (3) of the gripper finger (2) is releasable from the connection (9). By the gripper axis (1) near The gripper finger (2) is connected to the entrainment foot portion (17), and the side of the head portion (16) of the gripper finger (2) facing the gripper support (14) is elastic and hard to wear. A sheet gripper device for a sheet-fed rotary printing press, characterized in that support members (12, 13) are arranged. 2. A decoupling connection (9) between the curved leaf spring section (3) and the entrainment foot (17) of the gripper finger (2) comprises a threaded connection (19). Is,
The sheet gripper device according to claim 1. 3. The elastic support members (12, 13) are support strips (12) and / or support cylinders (13) made of abrasion-resistant plastic, said support members being shaped connections and / or. ) Gripper fingers with material connection (2)
Sheet gripper device according to claim 1 or 2, which is fixed to the head portion (16) of the.