EP0196424B1 - Tenter frame with clips - Google Patents

Description

The invention relates to a tension chain provided with clips (in particular for textile machines) according to the preamble of claim 1.

A tension chain according to the preamble of claim 1 is known for example from GB-A-935206. In this known embodiment, the arms provided on the body of the clip for pivoting the ball clip run approximately horizontally in the outer region to their outer end which forms the pivot bearing point. The angle between the two arms of the clapper is also so large (in the version according to GB-A-935206 about 180 °) that the actuating arm in the open position protrudes so far over the upper edge of the cupper body that it is actuated by touching a control surface can be.

Due to the above-mentioned design features, the known clip has an undesirably large overall height for some applications.

Another known embodiment according to US-A-3744107 also has this disadvantage.

A reduction in the overall height of the clip is desirable for various reasons. For example, the minimum distance to be maintained between nozzles for hot air treatment of a web transported by means of the tension chain depends on the overall height of the clip.

The invention is therefore based on the object of designing a tension chain of the type required in the preamble of claim 1 in such a way that there is a substantial reduction in the overall height of the clip. At the same time, it should be ensured that the clip does not protrude beyond the profile of the clip body even in the open state, so that the chain can be transported back with opened clip.

This object is achieved according to the invention by the combination of the characterizing features of claim 1.

According to the invention, the clip body is made of spheroidal graphite cast iron or cast stainless steel, i. H. a material of particularly high strength. When using a stainless steel axle for the clapper, the material pairing thus given already represents a plain bearing with a long service life. The choice of the above-mentioned high-quality material for the cupper body also forms a first essential requirement for the desired reduction in the overall height.

According to the invention, the arms provided on the cuddy body for pivoting the cupping ball run obliquely upward from their attachment point to their outer end forming the pivot bearing point, so that the latter is at a greater distance from the plane of the cupping table than the attachment point. As a result, a free space is created above these obliquely extending arms, into which a control member for actuating the small clod can dip.

According to the invention, the angle between the two arms of the clapper is kept so small that the actuating arm does not protrude beyond the upper edge of the cupper body in the open position. As a result, the chain can be transported back when the clapper clips are open, without the clapper clips protruding above the maximum profile of the clip body.

The length of the hinge pin is shortened by reducing the overall height of the clip. In order nevertheless to keep the surface pressures in the joint bearing point as small as possible and thereby increase the service life of the slide bearing bush engaging with the joint bolt, the joint bolt is designed with an extremely large diameter. The ratio of length to diameter of the hinge pin is expediently between 1: 0.9 and 1: 1.5, preferably between 1: 1.1 and 1: 1.3.

Useful embodiments of the invention are the subject of the dependent claims and are explained in connection with the description of some of the exemplary embodiments illustrated in the drawing. The same applies to the numerous other advantages of the clip chain according to the invention.

• Fig.1 einen Schnitt (in Längsachse der Kette gesehen) einer Kluppe in rollender Ausführung;
• Fig. eine Aufsicht auf den Kluppenkörper der Kluppe gemäss Fig. 1;
• Fig.3 einen Schnitt durch den Kluppenkörper längs der Linie 111-111 der Fig. 2;
• Fig.4 eine Ansicht des Kluppenkläppchens von unten;
• Fig.5 einen Schnitt durch das Kluppenkläppchen längs der Linie V-V der Fig.4;
• Fig. 6 eine Aufsicht auf ein Innenlaschenpaar;
• Fig.7 einen Schnitt durch das Innenlaschenpaar längs der Linie VII-VII der Fig. 6;
• Fig.8 eine Aufsicht auf ein zur Sicherung der Gelenkbolzen dienendes Federstahlblech;
• Fig.9, 10 und 11 Schemadarstellungen zur Erläuterung der Funktion der Druckfeder in der Öffnungs- und Schliessstellung des Kluppenkläppchens;
• Fig. 12 einen Schnitt (entsprechend Fig.12) einer Kluppe in gleitender Ausführung.

Show in the drawing

• 1 shows a section (seen in the longitudinal axis of the chain) of a rolling clip;
• FIG. 1 shows a plan view of the clip body of the clip according to FIG. 1;
• 3 shows a section through the clip body along the line 111-111 of FIG. 2;
• 4 shows a view of the Kloppenklappchen from below;
• 5 shows a section through the Kllappenklppchen along the line VV of Figure 4;
• 6 is a plan view of a pair of inner plates;
• 7 shows a section through the pair of inner plates along the line VII-VII of FIG. 6;
• 8 is a plan view of a spring steel sheet serving to secure the hinge pins;
• 9, 10 and 11 are schematic representations for explaining the function of the compression spring in the open and closed position of the small clod;
• Fig. 12 is a section (corresponding to Fig.12) of a clip in a sliding version.

The clip 1 shown in FIG. 1 is part of a tension chain which moves along a fixed guide 2 perpendicular to the plane of the drawing. The web 3 captured by the tenter is indicated by dashed lines.

The tensioning chain consists of a number of clips 1 of the same type, which are connected to one another via hinge bolts 4 and brackets.

The clip 1 essentially consists of a clip body 5, which is illustrated in detail in FIGS. 2 and 3, and a clip clip 6, the details of which can be seen in FIGS. 4 and 5.

The clip body 5 forms with two surfaces 7, 8 an outer plate pair between which the two inner plates 9 and 10 of an inner plate pair shown in FIGS. 6 and 7 engage (for reasons of clarity, the inner plate pair formed by the inner plates 9, 10 is shown in FIG. 1 not shown). The surfaces 7 and 8 of the clip body 9 which form the outer plates are provided with bores 11, 12 for receiving the hinge pins 4.

The two steel inner plates 9, 10 of a pair of inner plates are firmly connected to each other in the area of the two articulation points by a pressed-in chain bushing 13, 14. A protective roller 15, 16 is rotatably arranged on the chain bushings 13, 14 with the interposition of sliding lacquer 17. The protective rollers 15, 16 perform a slight rotary movement when the chain enters the chain wheel. Since this movement is small, the sliding surface between the chain bushing 13, 14 and the protective roller 15, 16 can be adequately lubricated for life with sliding lacquer 17. A slide bearing bushing 18, 19 is also arranged in the chain bushings 13, 14.

As is apparent from Fig. 1, the hinge pin 4 is drilled hollow, i. H. provided with an upwardly open recess 20.

The lower end 4a of the hinge pin 4 forms the inner ring of a ball bearing 21, the outer ring 22 of which forms a roller which engages with a rail 23 of the fixed guide 2.

From the bottom of the recess 20 of the hinge pin 4, a short axial bore 25 with a lubricating nipple 24 leads with a subsequent transverse bore 26 into the interior of the ball bearing 21. This design results in very short relubrication channels for the ball bearing, so that dead, i.e. H. There is only a very small amount of grease not involved in the lubrication.

The interior of the ball bearing 21 is sealed at the bottom by a circular cover 27 and at the top by an annular cover 28. The annular cover 28 forms a small running gap with the hinge pin 4. This sealing of the ball bearing 21 ensures that fat losses, particularly downwards, cannot occur.

If one designates the diameter of the hinge pin 4 with d and the pin length relevant for the surface pressure in the joint between the undersides of the surfaces 7 and 8 of the bracket body 5 (ie the height of the chain bushings 13, 14 according to FIG. 7) with 1, the ratio is from length 1 to diameter d of the hinge pin 4 in the illustrated embodiment approximately at 1: 1.2.

The hinge pin 4 is provided above the ball bearing 21 with an attached ring 29, which rests on the underside of the surface 8 of the clip body 5. To secure the hinge pin 4 in the bracket body 5, a spring steel sheet 30 is provided, the design of which can be seen in FIG. It contains two recesses 31, 32 which are open towards the front and whose parallel side edges come into engagement with lateral flat grooves 4b of the chain bolts 4. In this way, the hinge pin 4 is secured on the one hand by the spring steel sheet 30 and the ring 29 against axial movement and on the other hand prevented by the spring steel sheet 30 from rotating relative to the clip body 5.

The bracket body 5, which is made of spheroidal graphite cast iron or stainless steel casting, contains, in addition to the two surfaces 7, 8 already mentioned, which form the outer plates, an arm 33 and two arms 34, 35 for pivoting the bracket clip 6. The arms 34, 35 extend from its attachment point on the main part of the clip body 5 obliquely upwards to its outer end forming the pivot bearing point (bore 36 FIG. 3), so that the latter is at a greater distance from the plane of the arm 33 than the attachment point. This results in a free space 37 above the arms 34, 35, into which a control member for actuating the small clip can engage (as is clear from the description of FIGS. 9 to 11).

The clip 6 shown in its details in FIGS. 4 and 5 is made in one piece from a hardenable stainless steel investment casting. It is essentially designed as a two-armed angle lever and contains an arm 38 forming the clip knife and an actuating arm 39. Furthermore, on the underside of the clip is 6 two webs 40, 41 are provided which receive the axis of a push button roller 43 in a bore 42 (cf. FIG. 1). Another bore 44 in the webs 40, 41 serves to receive an axis, via which a spring housing 45 is pivotably articulated on the clip 6.

The clip 6 is produced as follows: After the casting, the clip 6 is first hardened in the area of the knife edge (lower end of the arm 38). Then the pivot bearing bore 46 is made. The clip 6 is then received in the swivel bearing bore 46 produced for further processing.

Now the vertical knife surface 47a and then the oblique knife surface 47b are ground to a certain extent. Finally, by grinding a chamfer 47c, the exact distance a between the axis of the pivot bearing bore 46 and the knife edge (chamfer 47c) is set.

When the clip body 5 is produced, the exact distance between the axis of the bore 36 and the clip table is set in a corresponding manner. The clamp table 48 here consists of a flat, for example 3 mm thick steel plate which is carried by the arm 33 of the clamp body 5, fastened to it by means of hollow rivets and then machined. The processing takes into account the absolute parallelism of the axis to the bore 36 (pivot bearing axis for the clip 6).

The spring housing 45 provided between the bracket body 5 and the actuating arm 39 of the bracket 6 has at its end facing the bracket body an elongated hole 49 with which it is guided on a bearing pin 50 provided on the bracket body 5. As can be seen in FIG., The clip body 5 is provided with a recess 51 for receiving the spring housing 45.

For the laboratory bolt 50, 5 holes are provided in two different positions in the clip body, so that the bearing bolt 50 can either assume the position shown in full lines in FIG. 1 or the position shown in dashed lines (50 '). The resulting different function is explained in detail with reference to FIGS. 9 to 11.

In the spring housing 45, a compression spring 52 is provided, which is supported on the one hand on the bearing pin 50 and on the other hand on the bearing pin 53, via which the spring housing 45 is connected in an articulated manner to the actuating arm 39 of the clip 6.

The length of the compression spring 52 and the distance between the two bearing bolts 50, 53 is dimensioned such that the compression spring 52 holds the clip 6 under spring force in the open position. This situation is illustrated in Fig. 11. For example, if the compression spring 52 has a spring length of 19 mm (in the non-compressed state), the compression spring in the position shown in FIG. 11 has a length of 17 mm, for example. In the position according to FIG. 11, the chain can be transported back, the clip 6 in the open position not protruding beyond the upper edge of the clip body 5.

If the actuating arm 39 of the clapper 6 is pressed down by a control member, so that the clapper 6 pivots counterclockwise about the axis of the pivot pin 54, the compression spring 52 is first compressed even further, in which it is shown in FIG illustrated intermediate position, for example, has a spring length of 14mm. In the closed position (FIG. 9) the compression spring then has, for example, a length of 18 mm, so that the clip 6 is guided into the closed position by spring force and held in it. With this dimensioning of the compression spring or with the arrangement of the bearing pin 50 in the position illustrated with solid lines, the clip 6 is thus guided into the closed position by spring force.

However, a function as a "tentative clip" may now also be desired. In this case, the button roller 43 initially rests on the web 3 and is pulled outwards (ie in the direction of arrow 55 according to FIG. 1), with the tenter clip not yet fully closed. If the edge of the material web 3 then moves under the feeler roller 43, the feeler roller 43 falls down (into the recesses 56 in the clip table or in the arm 33 shown in FIG. 2), so that the clip clip 6 falls into the closed position. With this function as a “groping clip”, the clip 6 should not be exposed to any spring force in the last part of the closing movement.

In order to achieve this with an otherwise unchanged construction, the bearing pin 50 is arranged in the position 50 'indicated by dashed lines. If the compression spring of 19 mm spring length (in the relaxed state) assumed in the above example is taken as a basis, the compression spring in the open position of the clip also has a spring length of 17 mm (so that the clip also is held in the open position by spring force). In the closed position (corresponding to FIG. 9), on the other hand, the distance between the bearing pin 53 and the bearing pin 50 now in position 50 'is approximately 23 mm. The spring (19 mm long) is now completely relaxed, with some play, between the two bearing pins when the clip is closed.

In order to prevent the penetration of fibers and other contaminants into the recess 20 of the hinge pin 4, an additional spring washer 57 is provided in the embodiment according to FIG.

Fixed carbon rails 58, 59, on which the clip body 5 is supported with snapped-on steel springs 60, 61, serve for guiding and vertical support of the clip chain according to FIG. The selected geometry of the chain bar and chain allows 10 mm high coals to be used. This means that non-impregnated carbons can be used.

The rear limit of the chain travel is made with a wedge steel 62 to which a brass profile 63 is screwed. This brass profile 63 carries the carbon rail 58 on the one hand and at the same time serves to support the chain if the chain is not pulled by rail tensioning forces on the rail 23. It must be expected that the clips will also dip into the chain rail once. H. tarnish on the back. Due to the selected material pairing (spheroidal graphite cast iron or stainless steel cast for the clip body, brass for the profile 63), such counter-running is not critical.

If the chain has to be secured against rising on the joints, an additional wedge steel 64 lying horizontally can be screwed onto said wedge steel 62 at the critical points, which results in a contact surface for a supporting plastic element 65. The rigidity of the overall construction is achieved by selecting appropriately strong profiles. This reliably prevents the chain from rising.

The feeler roller 43 is made of aluminum, which is chemically oxidized, so that an extremely hard surface results. The feeler roller 43 is supported by means of a stud screw 66 (possibly with a plain bearing bush).

Fig. 12 shows in detail a clip in a sliding design. At the lower end of the hinge pin 4, a slide shoe 68 is fastened here by means of a screw 67, which on the one hand can absorb the fabric tensioning forces against an additionally arranged carbon rail 69 (via a steel spring 70) and on the other hand is designed so that it immerses the chain when immersed in the Can support the chain rail (ie when the clip moves to the left) against the brass profile 63 arranged there.

The clip according to the invention is not only distinguished by a significantly reduced overall height compared to known designs, but also has a number of further significant advantages. So the clip can be used up to about 300 ° C without loss of performance; it can also be used in processes that work with non-neutral (acidic or basic) substances.

The chain is suitable for sliding or rolling tension transfer, whereby the sliding surfaces of the chain consist of standard carbons.

Due to the described manufacture of the ball body and ball ball, it is possible to replace the ball ball (while ensuring the exact closing conditions).

The small grease paths in the hinge pins prevent grease loss when relubricating.

The clip allows working speeds of up to about 300 m / min. Ball bearings are given a sufficiently large diameter so that speeds of around 2000 rpm are not exceeded due to the life of the grease used for lubrication.

The stylus roller 43 can also be made of plastic, brass or stainless steel instead of aluminum.

The bearing bore 36 (Figure 3) can also be provided with a plain bearing bush to avoid the formation of vibration rust.

Claims (12)

1. Tenter frame provided with clips, particularly for textile machinery,

a) consisting of a plurality of clips (1) which are flexibly connected to one another by means of link pins (4) and side plates,

b) each clip containing a clip body (5) and a clip flap (6) which is pivotally mounted on the clip body and is movable between an open position and a closed position,

c) the clip body (5) containing a clip table (48) and two arms (34, 35) for pivot mounting of the clip flap (6),

d) the clip flap (6) being constructed as a two- armed angle lever and having an arm (38) which forms the clip blade and an actuating arm (39),

characterised by the following features:

e) the clip body (5) is made from cast spheroidal graphite or high-grade cast steel;

f) the arms (34,35) provided on the clip body (5) for pivot mounting of the clip flap (6) run from their attachment point at an angle upwards towards their outer end forming the pivot mounting point, so that the latter is a greater distance from the plane of the flip table (48) than is the attachment point:

g) the angle between the two arms (38, 39) of the clip flap (6) is kept so small that in the open position the actuating arm (39) does not project over the upper edge of the clip body (5);

h) the ratio of length 1 to diameter d of the link pins (4) is between 1:0,9 and 1:1,5 preferably between 1:1,1 and 1:1,3.

2. Tenter frame as claimed in claim 1, containing pairs of inner and outer side plates which are connected to one another by link pins (4), characterised in that the pairs of outer side plates are formed by the clip bodies (5).

3. Tenter frame as claimed in claim 2, characterised by the following components of the pairs of inner side plates:

a) two inner side plates (9, 10) made from steel which are firmly connected to one another in the region of the two articulation points by a chain bushing (13, 14 respectively) which is pushed in;

b) a protecting roller (15, 16) arranged so as to be rotatable on each of the chain bushings (13,14) with lubricating paint (17) in between;

c) a slidable bearing bushing (18, 19) arranged in each of the chain bushings (13,14).

4. Tenter frame as claimed in claim 1, characterised in that the link pin (4) is hollow drilled.

5. Tenter frame as claimed in claim 1, in the construction as a rolling chain, characterised by the following features:

a) the lower end (4a) of the link pin (4) forms the inner ring of a ball bearing (21), the outer ring (22) of which is formed by a roller which engages with a stationary guide rail (23);

b) from the base of the recess (20) in the link pin (4) a bore (25, 26) provided with a grease nipple (24) leads into the interior of the ball bearing (21);

c) the interior of the ball bearing (21) is completely sealed towards the bottom against grease loss by a circular cover (27);

d) the interior of the ball bearing (21) is sealed towards the top by an annular cover which forms a gap with the link pin (4).

6. Tenter frame as claimed in claim 1, characterised by the following features for securing the link pins (4) against rotary and/or axial movement:

a) the link pins (4) have lateral flat grooves on their upper ends;

b) from the rear of the clip body (5) a spring steel plate (30) containing two recesses (31, 32) which are open to the front with their parallel side edges coming into engagement with the lateral grooves in the chain pins (4) can be pushed onto the two link pins (4).

7. Tenter frame as claimed in claim 1, characterised in that the clip flap (6) is made in one piece from a hardenable high quality refined steel casting.

8. Tenter frame as claimed in claim 1, characterised by the following features:

a) a spring housing (45) which is articulated on the actuating arm (39) of the clip flap by means of a bearing pin (53) is provided between the clip body (5) and the actuating arm (39) of the clip flap (6);

b) on its end facing the clip body (5) the spring housing (45) has a slot (49) with which it is guided on a bearing pin (50) provided on the clip body (5);

c) in the spring housing (45) a pressure spring (52) is provided which is supported on the two bearing pins (50, 53), and the length of the pressure spring and the distance between the two bearing pins are such that the pressure spring holds the clip flap in the open position.

9. Tenter frame as claimed in claim 8, characterised in that the length of the pressure spring (52) and the distance between the two bearing pins (50, 53) are such that the pressure spring also holds the clip flap (6) in the closed position.

10. Tenter frame as claimed in claim 8, characterised in that the length of the pressure spring (52) and the distance between the two bearing pins (50', 53) are such that in the closed position of the clip flap the pressure spring lies completely decompressed with some clearance between the two bearing pins.

11. Tenter frame as claimed in claim 8, characterised in that bores are provided in two different positions on the clip body (5) to accommodate the bearing pin (50,50'), and in the first position of the bearing pin (50) the pressure spring (52) also holds the clip flap in the closed position, whilst in the second position (50') it lies fully decompressed between the two bearing pins.

12. Method of producing a clip with a clip flap (6) as claimed in claim 7, characterised by the following operations:

a) after casting, the clip flap (6) is first of all hardened in the region of the blade edge;

b) then the pivot mounting bore (46) is made and the clip flap is accommodated in the pivot mounting bore for further machining;

c) next the vertical blade surface (47a) and the specifically oversize blade surface (47b) are ground;

d) finally, by grinding a chamfer (47c) the exact distance a between the axis of the pivot mounting bore (46) and the blade edge is set;

e) in the production of the clip body (5) the exact distance between the axis of the pivot mounting bore (36) and the clip table (48) is set in a corresponding manner.

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