DE1586012A1 - Pneumatically operated gripper for bottle packers - Google Patents

Description

P ΑΤΈ NT ANWÄ LT E 8902 augsburg-göggingen. 10/26/6?

v. Eichendorff Street 10

DR. ING. E. LIEBAU our sign Dr.Lb/rAz6 C 6758

_. '_ __ (Please specify when replying)

DIPl. ING. G.LIEB A U

Your sign

Your message from

Certus

Haschinenbau GmbH. 89 Augsburg stone ford 34

Compressed air operated gripper for bottle packers

The invention relates to a compressed air operated gripper for Bottle packer, consisting of several gripping the bottle head Gripping fingers, a wedge-shaped control member that moves the fingers radially inward into the gripping position, and a piston-cylinder unit, one part of which carries the gripper fingers and the other part Part is connected to the control member.

In such a gripper known (from DÜS Ί 027 126) two opposing gripper fingers are provided, each designed as a double-armed lever and articulated on a part connected to the cylinder. A connected to the piston by a piston rod wedge-shaped member can, when the piston is acted upon with compressed air, between the upper Hebe3 arms of the two gripping be pressed finger, causing the lower lever arms is successively · move capture and gripping position the bottle head, the air pressure removed , so is dt. Piston and thus the wedge-shaped member upwards by spring force

0098U / 0968 -2-

0821/330433 Tel « _B r..Adr.j ElPATENT Postodtadkonto MBnch.n 86510 Deut **» Bonk Awetbnre Kto. O8 / 34H

ORIGiNAL ir-SPECTED .- ■ —-

emotional. Another connecting the upper lever arms together Ringfeder can then press the upper lever arms against each other, whereby the lower lever arms are spread apart and thus come into the delivery position. This well-known compressed air operated gripper however, it is relatively expensive to construct and. accordingly expensive. It also has relatively large overall dimensions and is correspondingly difficult to take into account is j that several such grippers for lifting a packing unit are arranged on a gripper frame · The gripper fingers can practically just like the wedge-shaped control element made only of metal be manufactured, whereby on the one hand a high level of wear is caused and also damage to the bottle head can occur. In addition, the bottle is not centered by the two cooperating gripping fingers, which is significant for bottle packers Can lead to disruptions.

The present invention is therefore based on the tasks a compressed air operated gripper of the type mentioned at the beginning to create that is simpler in its structure and correspondingly cheaper to manufacture, which is also less susceptible to wear is and in which the bottle detected in each case is properly centered.

This is achieved erfindtmgsgemaB characterized in that the circularly arranged gripping fingers consist of a common base part mia a piece of resilient plastic, which is connected to the piston, and in that concentrically to the gripping fingers as control

0098U / 0968 -3-

_BATH ORIGINAL

member a relative to the fingers axially displaceable, connected to the cylinder sleeve is provided, which has at its lower end a conical downwardly tapering contact surface on which the lower oars of the gripping fingers are supported so that they are in relation to the upward movement of the sleeve Bottom part be moved radially inward in the gripping position and when moving downwards thanks to its elasticity radially outward in the delivery position. The new gripper is characterized by a particularly simple structure, the gripper finger and bottom part consist of a single piece of elastic plastic and can accordingly be manufactured cheaply, for example by injection molding. Any articulated connections were dispensed with and all gripping fingers are also connected to the bottom part from the start, so that only this alone has to be connected to the piston. Due to the circular arrangement of the gripping fingers, the bottle head is gripped on all sides by gripping fingers, so that the bottle is perfectly centered with respect to the gripper. The position of the gripper determines the position of the bottle and for this reason, several bottles can be lowered into the crates or cardboard boxes provided for this purpose in a precisely centered manner. Furthermore, the new gripper is not very susceptible to wear because it has no joints. the gripping fingers have a low friction with respect to the bushing that cooperates with them, if the bushing is made of a suitable material, for example metal. The plastic gripper fingers also have the advantage that the pocket head is practically no longer damaged.

0098U / 0968 " ⁴ '"

Further advantages and details of the invention are based on an embodiment shown in the drawing explained in more detail below

In the drawing, 1 denotes the entire gripper. Several such grippers, for example twelve or twenty, are arranged on a common raisable and lowerable gripper frame 2 for packing or unpacking a corresponding number of bottles. The gripper has several gripping fingers 3 », for example ten, which are arranged in a circle with respect to one another and, according to the invention, consist of one piece with a bottom part 4. Slots 5 'which are provided between the gripping fingers make it possible for them to be moved radially inward, as will be described below. Gripping fingers 3 and bottom part 4 are made of an elastic plastic, such as is known, for example, under the designation "Hostaform-0" (Acetalkop ± ymerisat) or "Delrin" (plastic / obtained by polymerization from H ^ O-free GHoO). The bottom part 4 can be connected to a compressed air piston or it is expedient, as is the case in the embodiment shown, designed as a piston itself and carries a seal 6 intended. This sleeve can be connected by the compressed air cylinder or, as is the case in the exemplary embodiment shown, it can itself be designed as a cylinder. In the lower part it has a conically downwardly tapering contact surface 8 which cooperates with the lower ends 3 a of the gripping fingers 3. In the upper part is

0098U / 0968 -5-

die'Zylinderbüchse 7 closed by a cover 9, which is sealed with respect to the piston rod 11 via a seal 10 · A collar 15 of an intermediate sleeve 14 · limits the movement of the Cylinder liner 7 upwards for the case when no bottle is detected.

The bottom part 4- is fastened by means of the nut 15 to the piston rod Ή, which can be made hollow for the purpose of supplying compressed air. Advantageously, compared to the gripper frame 2, the piston rod can be moved axially upwards against the force of the spring 17. This displaceability is provided so that the individual grippers can move slightly upwards when the gripper frame is lowered so that all grippers can be supported evenly on the bottle heads when the bottle height deviates.

The one surrounding the piston rod 14 concentrically is advantageously supported Helical compression spring 17 on the one hand on the gripper frame 2 and on the other hand on the cover 9 of the cylinder liner 7. Through this it fulfills a twofold function in that it static support of the entire gripper 1 in relation to the gripper frame 2 and, on the other hand, also to return the cylinder » in the delivery position as described in more detail below.

To the introduction of the bottle head between the gripper fingers au facilitate and at the same time avoid damage or premature inward bending of the gripper fingers, the The cylinder liner is conveniently attached to your lower hand

0098U / 0968. ₆ -

upwardly tapering insertion funnel 18. The smallest diameter D of the insertion funnel should advantageously be equal to or smaller than the clear diameter of the gripping fingers in the delivery position, as shown in the right rope of the drawing.

The mode of operation of the new gripper is as follows: In the drawing, the new gripper 1 is shown in the left part in the gripping position and in the right part in the delivery position. In the delivery position, the gripper frame 2 with the grippers 1 provided thereon is lowered onto the head K of the bottles until the nut 15 comes to rest on the bottle head. When the gripper frame 2 is lowered further, the spring 17 is compressed somewhat, thus ensuring that the gripper actually rests on the bottle head. Then compressed air is introduced into the cylinder chamber 19 via the hollow piston rod ΛΑ, whereby the cylinder liner 7 is moved upwards. Here, the lower ends 3a of the gripping fingers 3 are moved radially inward by the conical contact surface 8 until they rest firmly against the bottle head. Since the gripping fingers 3 encompass the bottle head from all sides and this bottle head is also supported on the nut 15, the bottle is centered exactly in the axial direction of the gripper, which is advantageous when it is placed in boxes or cartons. When the bottle is set down at the desired point, the air pressure is released and the cylinder liner 7 is moved downwards by the spring 17 · The gripping fingers 3 move radially outward thanks to their elasticity and release the bottle head.

- 7 -0098U / 0968

1 5 B 6 O ι 2

As you can see from the description above, the most important parts of the new bottle gripper each have a two, multiple function, which not only reduces the number of parts but also the weight of the entire gripper. The bottom part 4 is used not only to hold the gripping fingers 3 but at the same time also as a piston. The sleeve 7 also serves both as a control element for the gripping fingers and as an insertion and centering element for the bottle head and, finally, as a compressed air cylinder. The same applies to the spring 17, the load of the entire gripper and for returning the cylinder to the delivery position is provided. .

009814/0968

Claims (8)

Claims 1. Pneumatically operated gripper for bottle packers, consisting of several gripping fingers grasping the bottle head, one wedge-shaped moving the fingers radially inward into the gripping position Control member, as well as a piston-cylinder unit, one part of which carries the gripping fingers and the other part with the Control member is connected, characterized in that that the circularly arranged fingers (3) with a common base part (4) made of a piece of elastic plastic exist, which is connected to the piston, and that concentric to the gripping fingers (3) as a control member relative to the fingers axially displaceable, connected to the cylinder sleeve (7) is provided, which at its lower end has a conically tapering downward contact surface (8), on which the lower ends (3a) of the gripping fingers (3) are supported in such a way that they face the sleeve (7) when they move upwards the bottom part (4) radially inwards in the gripping position and when moving downwards be moved radially outward into the dispensing position thanks to their elasticity. 2. Gripper according to claim 1, characterized in that that the sleeve (7) simultaneously forms the compressed air cylinder and is sealed against a piston rod (11). - 9 -0098U / 0968 3 gripper according to claim 1, characterized in that that the bottom part (4 ·) is designed as a piston and is firmly connected to a piston rod (11). 4-, gripper according to claim 2 and J, characterized that the bottom part (4-) in the cylinder liner (7) as a piston is slidably guided. 5 · Gripper according to claim 3 * characterized in that that the piston rod (11) for the purpose of supplying compressed air in is formed in a known manner hollow. 6. Gripper according to claim 5 »or 5» characterized that the piston rod (ü) axially opposes in a manner known per se with respect to a gripper frame (2) carrying a plurality of grippers Spring force (17) is guided displaceably. Gripper according to Claim 6, characterized in that one concentrically surrounding the piston rod (11) Screw compression spring O?) On the one hand on the gripper frame (2) and on the other hand on the cylinder liner (7) or its cover (9) and for returning the cylinder liner to the delivery position serves. 8. Gripper according to claim 2, characterized in that the cylinder bushes C?) ⁸ ^ ¹ lower sand a conical - Ίο - upwardly tapering "SI nfSTirt richt he (18) has", 009814/0968 - ίο - 9- gripper according to claim 8, characterized in that that the smallest diameter (D) of the insertion is correct (18) is equal to or smaller than the clear distance between the gripping fingers (3) in the delivery position. 0098U / 0968