DE8809355U1 - Clamp chain for film transport - Google Patents

Description

Clamp chain for film transport

The innovation concerns a clamp chain for film transport, whereby a film strip is inserted into the moving gripper parts of the chain and is held there forcedly and positively during transport.

Such a chain for film transport is used in packaging machines to transport the film strip including the cups formed in the film strip. The film strip is introduced into the new chain, grasped by the chain or by the clamping elements or gripping elements of the chain in the manner of a gripping jaw and by the drive motor positively connected to the chain in cycles to a heating station, forming station, filling area, sealing station, punching station and finally to the end of the machine, where the processed film, i.e. the film now with punched-out sections, is taken up by a winding roll.

In previously known clamp chains for film transport §.».b there are different shapes of the gripping profile of the gripper elements of the chain, whereby different profile shapes have been proposed in order to achieve a force- and form-fitting engagement with the film strip to be transported.

Until now, only gripper elements for such film transport were known, which only inadequately solved the task of grasping, holding and transporting.

On the one hand, the gripping device in these gripper elements - consisting of the spring-loaded gripping jaw in conjunction with the stationary system - was designed in such a way that a secure clamping of the film strip to be transported could not be achieved.

Another disadvantage of the state of the art is that the movable gripper part was usually only moved vertically upwards, which meant that the opening space for inserting the film was very limited and it was therefore necessary to first bend the film slightly and guide it between the open gripper jaws, which was associated with increased machine expenditure and the risk of damaging the film.

* The present innovation is therefore based on the task of

% To develop the gripping element of a clamp chain in such a way that the plastic film can be easily inserted into the opened gripper and transported safely.

To solve the problem, the innovation is characterized in that the movable gripper part is mounted as a clamping part in a spring-loaded manner on the stationary gripper part so that it can rotate upwards and backwards in its open position, so that the movable gripper jaws can be pivoted upwards and downwards away from the stationary gripper jaws, so that a free space is created between the movable and stationary gripper jaws, which enables the film to be easily inserted between the open grippers without bending and without risk of damage.

The present technical teaching therefore achieves the essential advantage that the movable gripper jaws not only swing upwards away from the fixed gripper jaws, but also upwards and backwards (i.e. are moved away sideways), which results in a large gripper opening and the film strip can be easily inserted into this gripper opening without risk of damage.

In a preferred embodiment of the present invention, it is preferred if the pivoting away of the spring-loaded gripper elements takes place under the influence of an opening roller that is rotatably mounted on the machine frame and that rests with a radius on an inclined edge of the movable gripper element, whereby the required lateral pivoting movement of the gripper element is achieved.

The simultaneous upward movement of the movable gripper element is achieved by a projection on the opening roller, which interacts with a corresponding projection on the movable gripper element below.

It is important here that the movement of the movable gripper element occurs by the chain running tangentially onto the opening roller, which is rotatable but not displaceable on the machine frame, and through the tangential movement the lower attachment of the movable gripper element comes into contact with the corresponding attachment of the opening roller, and through further tangential movement of the chain and opening roller towards each other the movable gripper element is moved upwards against the force of the spring and rotated at the same time.

This has the advantage that the opening roller is a very simple rotating part, which is very simply designed, and as a result the manufacturing costs can be significantly minimized. There is therefore no need for complicated coupling and opening mechanisms to open such movable gripper elements. Further advantageous embodiments can be found in the subclaims.

The innovation will now be explained in more detail using an example implementation.

Figure 1 shows the side view of a clamp chain according to the innovation in a first embodiment.

Figure 2 shows the top view of the clamp chain according to Figure 1 in the direction of arrow II.

Figure 3 shows the top view of the clamp chain according to Figure 1 in the direction of arrow III in Figure 1.

Figure 4 shows the front view of the gripper profile of the clamping part as an individual part.

Figure 5 shows a second embodiment of a clamp chain in comparison to Figures 1 to 3.

Figure 6 shows the side view of the clamp chain according to Figure 1 in its position when it runs onto an opening roller, with which the clamping part 2 is lifted and rotated.

Figure 7 shows the representation in the direction of arrow VII in Figure without a disc attached to the front.

Figure 8 shows the section through the ring shown in Figures 6 and 7.

According to Figure 1, the clamp chain 1 consists of a roller chain 10, the roller links of which are connected to one another in an articulated manner via links 11 in a manner known per se.

Bolts 12 are provided for the articulated connection of the roller links with the plates 11 of the roller chain 10, with a clamping part 2 being attached to two adjacent bolts.

This clamping part is the core of this innovation.

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The clamping part 2 consists of an angle bracket 3, which is connected to the roller chain 10 by two adjacent bolts 12 via corresponding riveting of the bolt 12.

Figure 5 shows that such an angle bracket 28 can also be used in the reversed position - as shown in Figure 1 - whereby the clamp chain shown in Figure 5 is preferred for certain purposes.

The angle bracket 3 is bent at a right angle and forms a support plate 8 in its bent upper part, at the front end of which a clamping notch 9 is incorporated, into which the gripper mouth 7 of the movable and spring-loaded clamping part 2 engages.

The clamping part 2 is movable and spring-loaded on the angle bracket as follows:

A guide part 4, which preferably consists of a plastic material, is attached to the underside of the support plate 8 of the angle bracket 3.

The guide part 4 consists of a rectangular Plastic part, on both opposite ends of which

a pin 17 is formed.

The respective pin 17 extends through an elongated hole 18 of the clamping part, whereby the opposite elongated holes 18 of the clamping part 2 are precisely aligned with each other.

The elongated holes 18 are incorporated in the arms 13 of the clamping part 2, whereby it is important that the longitudinal axis 19 of the respective elongated hole 18 forms an angle 21 to the horizontal 20.

Only thanks to this construction - as explained later - the

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Clamping part Z swings both upwards and backwards, which leads to a particularly large receiving or opening space being formed between the gripper mouth 7 and the support plate when the clamping part is open .

As already described, the movable clamping part 2 is slidably and rotatably mounted on the pin 17 of the guide part 4.

According to Figure 2, the arms 13 form projections 14 that are bent downwards and inwards and engage the underside of a spring 6.

The opposite part of the spring 6, which is preferably designed as a helical compression spring, is pushed over a pin 5, which pin 5 is firmly connected to the guide part 4.

In this way, the clamping part 2 is pressed against the support plate 8 with its gripper jaw 7 under spring load and the gripper jaw 7 engages with its gripper profile 22 (see Figure 4) in a force-fitting manner in the clamping notch 9 of the support plate 8.

From Figure 6 it can be seen that the upward and backward pivoting of the clamping part 2 results in an opening space 40 which has a width 41.

From this it can be seen that by pivoting the gripper mouth 7 upwards and backwards, a large opening space 40 is created, into which the film to be transported can then be inserted very easily and without damage or deformation.

According to Figure 1 , the arms 13 have inclined surfaces 15 directed backwards , the underside of the arm being formed by a foot part 16 , the function of which will be explained in more detail with reference to Figure 6 .

Figure 4 shows a preferred embodiment of a gripper profile 1ε 22, where it can be seen that there are three independently acting clamping surfaces 23,24*25.

The clamping surfaces are separated from one another by the fact that arches 26, 27 are arranged between the clamping surfaces, so that only the clamping surfaces 23-25 are pressed into the associated clamping notch 9 on the fixed support plate 8 under the force of the spring 6.

The design of these three independently acting clamping surfaces 23-25 therefore provides the advantage that the gripper, which is mounted on the pin 17 with a certain amount of tilting play, automatically centers itself on the support plate 8 under the force of the spring 6, so that the clamping surfaces 23 - 25 exert a large surface pressure on the film to be transported.

In connection with Figure 5, reference is made to the above description, whereby it should only be made clear here that the angle bracket 3 can also be attached as an angle bracket 28, in reverse to that in Figures 1 to 3, whereby certain advantages for the transport of a film with the clamp chain according to the innovation are achieved.

Figures 6 and 7 show the situation of the clamp chain 8 according to the invention when it runs onto the opening station, i.e. when it runs onto the elements that cause the clamping part 2 to open in the direction of arrow 42.

First, Figure 6 shows that the clamp chain 1

positively engaged with a sprocket 29, which

is driven step by step by a drive motor not shown in detail.

The clamp chain 8 is tangentially attached to a rotatable, but

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The opening roller 30, which is mounted immovably on the machine housing, is brought closer because the opening roller 30 is connected in a rotationally fixed manner to the chain wheel 29.

The opening roller 30 consists, at its part closest to the roller chain, of a disk part 34 of enlarged diameter, which forms a first surface 35 on its inner surface.

The contact surface 35 merges into a contact surface 36 which is approximately perpendicular to it and is arranged horizontally in the drawing and which acts as a shoulder of the opening roller 30 with the foot part 16 of the clamping part 2.

This run-on surface 36 causes the clamping part 2 to be lifted in the direction of arrow 43, whereby - as shown in Figure 6 - the oblique arrangement of the elongated hole 18 simultaneously produces a displacement movement that is oblique in the direction of the longitudinal axis 19 and furthermore the run-on surface 35, which is designed as a radius, causes the clamping part 2 to tilt in the direction of arrow 42.

Due to the overlapping movements in the arrow directions 42, 43, the gripping jaw 7 is moved upwards and backwards away from the clamping notch 9 in the arrow direction 42, resulting in the previously described large width 41 of the opening space 40.

To center the clamping part 2 against tilting in the direction of the arrow 44, a plastic ring 32 is used _which is firmly connected to the opening roller 30 according to Figure 6. The plastic ring 32 is pressed axially onto the opening roller 30 via a disk 31.

The disk 31 has axially inwardly directed tips 33, which delimit the recess 37 at the flanks, so that these tips form axial flanks 39 which are directed obliquely in the direction of the base 38 of the recess 37.

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As can be seen in Figure 7, the arms 13 rest in a form-fitting manner on the opposite and symmetrically arranged flanks 39 of the recess 37, so that a centering of the clamp chain 1, in particular of the clamping part 2, is created against tilting in the arrow directions 44.

It is not necessary that the tips 33 end in a point as shown in Figure 8; they could equally well end in the form of a rectangular surface.

With the described, innovative clamp chain 1, significant advantages are achieved, because on the one hand a large opening space 40 is achieved by the innovative mounting of the clamping part 2 on the angle bracket 3,28 and on the other hand the opening elements, consisting of the opening roller 30 and the associated parts 31,32, are very simple and inexpensive, so that a wear-resistant and reliable opening mechanism is thereby produced.

DRAWING LEGEND

1 clamp chain

2 clamping part

3 Angle bracket

4 Guide part

5 cones

6 Spring

7 Gripper jaw

8 Support plate

9 clamping notch

10 roller chain

11 Tab

12 bolts

13 Arm

14 Approach

15 Inclined surface

16 Foot part

17 tenon [8 slot

19 Longitudinal axis

20 Horizontal

21 angles

22 Gripper profile

23 Clamping surface

24 clamping surface

25 clamping surface

26 sheets

27 sheets

28 Angle bracket

29 Sprocket

30 opener roll

31 Disc

32 Rings

33 top

34 Disc part

35 Ramp area

36 Ramp surface

37 Recess

38 Reason

39 flank

40 opening space

41 Width

42 Arrow direction

43 Arrow direction

44 Arrow direction

Claims (8)

Your message from Your letter of Applicant: Mr. Karl Fabricius, Weidstrasse 1, CH-6331 Hünenberg/Switzerland Protection claims 1. Clamp chain for film transport, whereby a film strip is inserted into movable gripper parts of the chain and is held there in a force-fitting and form-fitting manner during transport, characterized in that the movable gripper part is spring-loaded as a clamping part (2) and is pivotably mounted on the stationary gripper part in its open position so that it can rotate upwards and backwards, so that the movable gripper jaws (7) are pivoted upwards and backwards away from the fixed gripper jaws, so that a free space (40) is created between the movable and fixed gripper jaws, which enables the film to be inserted easily between the open grippers without kinking and without risk of damage . letephon: Lindeu (O 83 82) 780 2S 54374(paK-d) paM-Mau FacaMto/*Max: BmUamr. P0*ttchKtta*> 448-8382-78027 BayatVtoafeabnfc LMu(B)I*: 1257 HO (bank code 735 200 74) Munich 414848-808 2. Anchor chain according to claim 1, characterized in that angle brackets (3) are arranged on bolts (12) of the clamp chain (1) with a guide part (4) on the underside, the guide part (4) having pins (1?) which reach through backward-inclined slots (18) in the arms (13) of the clamping part (2) and that the arms (13) form downward projections (14) which engage in a spring (6) which is supported by a pin (5) on the underside of the guide part (4). 3. Clamp chain according to claims 1 and 2, characterized in that the clamping part (2) forms a gripper mouth (7) with clamping surfaces (23, 24, 25) which are connected to one another by arches (26, 27). 4. Clamp chain according to claims 1 and 2, characterized in that the angle brackets (3) are arranged bent downwards and are gripped by the clamping parts (2) to form a gripper mouth (7). 5. Clamp chain according to claims 1 and 2, characterized in that the clamping part (2) has a horizontal foot part (16) and a rearwardly inclined surface (15) on the underside, which pass into an opening roller (30) for actuation. 6. Clamp chain according to claim 5, characterized characterized in that the opening roller (30) has a disc part (34) with a first curved contact surface (35), as well as a further contact surface (36) for the foot part (16) of the clamping part (2). 7. Clamp chain according to claims 5 and 6, characterized g e k e &eegr;&eegr;&zgr; e i c h &eegr; e t that a ring (32) with trapezoidal recesses (37) and flanks (39) is arranged in front of the opening roller (30), wherein the ring (32) has tips (33) inclined backwards, which clamp around the arms (13) of the clamping part (2) and secure them against tipping over. ff · 1 · · 8. KI ammer chain according to claims 1 and 2, characterized g e k e &eegr;&eegr;&zgr; e i c h &eegr;&egr; t that the angle bracket (3) has a support plate (8) formed with a clamping notch (9) for engagement of the gripper mouth