CZ295462B6 - Double jersey circular knitting machine - Google Patents

Abstract

The present invention relates to a double jersey circular knitting machine having a cylinder bed and a needle dial (6) both supporting knitting means and arranged concentrically around the machine axis, whereby the cylinder bed is arranged on a cylinder bed support being pivoted in the machine bed and the needle dial (6) is removably connected with the needle dial (6) support (4) that is mounted on the bottom end of a shaft (1) situated in the upper part of the machine and synchronously driven by a cylinder bed support drive. Between an outer part (42) of the needle dial (6) support (4) for fixation of the needle dial (6) and an inner part (41) of the needle dial (6) support (4) and/or between the needle dial (6) support (4) and the needle dial (6) there are temperature compensation means radially movable in a limited range for stabilization of differences in heat dilatation of the needle dial (6) and the needle dial (6) support (4).

Description

(57)

BACKGROUND OF THE INVENTION The invention relates to a double circular knitting machine with a cylindrical bed and a plate bed (6), wherein the beds carry knitting means and are arranged concentrically around the machine axis, the cylindrical bed being arranged on a cylindrical bed support. (6) is detachably coupled to a plate support (4), which is mounted at the lower end of the shaft (1), which is situated in the upper part of the machine and is synchronously driven by the drive of the cylinder bed support. An outer portion (42) of a plate bed support (6) for attaching a plate bed (6) and an inner portion (41) of a plate bed support (6) and / or a plate bed support (4) and a plate the seat (6) are connected by a radially elastic ring (45) coaxial with the machine axis and situated between the outer and inner part (42, 41) of the support (4) of the plate seat (6) and / or connected exclusively by radially displaceable means connecting a bed (6) with a support (4) for a plate bed (6).

and

Double circular knitting machine

Technical field

BACKGROUND OF THE INVENTION The invention relates to a double circular knitting machine with a cylindrical 5-bed and a plate-type bed, wherein the beds carry knitting means and are arranged concentrically around the machine axis, the cylindrical bed being arranged on a roller-bed carrier rotatably mounted in the machine bed. is coupled to a plate-type carrier which is fixed at the lower end of the shaft, which is situated in the upper part of the machine and is synchronously driven by the drive of the cylinder-type carrier.

BACKGROUND OF THE INVENTION

On double circular knitting machines, knitting is formed by the movement of knitting means, usually needles, arranged in grooves 15 arranged parallel to the axis of the needle cylinder and radially on the needle plate. The needles are in their grooves known to be cyclically reciprocated in the direction of the grooves by means of a locking system by rotating the beds. In this case, the cylindrical seat is fixed in a known manner to the cylindrical bed support and the disk-shaped bed is fixed in a known manner to the disk-shaped support which is connected to the lower part of the support shaft which is coaxial with the machine axis.

The movement of the knitting means in the beds generates a considerable amount of heat and the beds can be heated to a temperature of 50 ° C to 80 ° C or more. On the other hand, there is no heat in the bed carriers. Due to the temperature difference, there is a different thermal expansion, and there is a high mechanical stress at the connection point of the bed with the carriers.

In the case of cylindrical beds, this problem is also complemented by the expansion of the entire cylindrical bed carrier and the bearing load. For example, DE 28 29 678, DE 39 06 773, US 5 493 876, EP 647 732 and CZ 2000-4932 (PCT / CZ01 / 00077) solve this problem.

In the case of plate beds, solutions with a large radial width of the bed are known, which, for example, are fixed by means of screws on a flange arranged at the lower end of the support shaft, where it is centered by means of a centering shoulder, see FIG. US 5,099,661, US 5,224,360, or centered by means of centering screws. DE 196 53 761. The temperature of the bed on the small inner diameter at which the bed is fastened is already lower and therefore the forces acting on the bed connection lie within the permissible limits. The disadvantage, however, is the need to machine a large amount of material and also increases the material cost of the quality material needed to make beds. The narrow annular beds have less material and manufacturing demands, but at the attachment point they have almost the same temperature as the needle grooves. As a result, the connection of the bed to the support exerts considerable forces which cannot be maintained by the friction-bolted screw connection and shifts the bed relative to the support with all the negative consequences for machine accuracy.

The invention aims to overcome or at least substantially reduce the drawbacks of the known solutions.

SUMMARY OF THE INVENTION

The object of the invention is achieved by a double circular knitting machine, characterized in that the outer part of the plate bed support for fastening the plate bed and the inner part of the plate bed support and / or the plate bed support and the plate bed are connected by a radially flexible ring arranged coaxially with the machine axis and situated between the outer and inner portions of the carrier

And / or are connected solely by radially displaceable means connecting the plate bed to the plate bed support.

According to one preferred embodiment, the radially resilient ring has a cross-section of symmetrical or asymmetric U, whose arms are up or down and one of the arms is connected to the inner part of the plate support and the other arm is connected to the outer part of the plate support.

According to a further preferred embodiment, the radially resilient ring has a profile comprising a thin-walled cylindrical portion arranged coaxial with the machine axis, the lower portion of the thin-walled cylindrical portion being connected to the outer portion of the plate support and the upper portion of the thin-walled cylindrical portion connected to the inner portion.

In another preferred embodiment, the radially resilient ring has a profile comprising a thin-walled cylindrical portion coaxial with the machine axis, wherein the upper portion of the thin-walled cylindrical portion is connected to the outer portion of the plate support and the lower portion of the thin-walled cylindrical portion is connected to the inner portion of the plate support.

According to a preferred embodiment, only the radially displaceable means connecting the plate bed to the plate bed support are formed by substantially horizontally arranged flanges situated on the outer periphery of the plate bed support and on the inner periphery of the plate bed, the flanges being one above the other and parallel to one of the flanges. holes are provided by a vertical axis of the machine to which a pin or pin extends with its second straight or eccentrically arranged end into a radially arranged groove in the second flange, the flanges being coupled together in a vertical direction by means of limited contact force and thermally initiated flange displacement only in radial direction.

In this case, a cube with an opening parallel to the machine axis and with two parallel walls associated with the walls of said radially arranged groove is located at the end of the pin or pin extending into the radially arranged groove in one of the flanges.

In this case, it is advantageous if an eccentric element located in the hole of the cube is rotatably arranged in one flange on a pin extending into a radially arranged groove.

From the point of view of the whole machine, it is advantageous if the plate-type support is arranged substantially in the form of a plate perpendicular to the machine axis, and in one preferred embodiment the plate-type support is provided with radial ribs on its upper and / or lower side.

In an advantageous embodiment, centering eccentric elements are arranged on the outer part of the plate-shaped support, which are rotatable about axes parallel to the vertical axis of the machine and which center the plate-shaped bed, a centering shoulder associated with the centering eccentric elements.

BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an exemplary embodiment of a radial elastic ring expansion expansion joint in the form of a radially resilient ring with a U-shaped cross-section and a support plate, FIG. 1 and an exemplary embodiment of a radial elastic ring expansion expansion joint; in the form of a thin-walled cylindrical part connected at the top to the inner part and at the bottom to the outer part of the plate support, FIG. 1b an exemplary embodiment of the thermal expansion compensator of the plate bed in the form of a radially flexible ring 1c shows a vertical section through one of the centering eccentric elements arranged on the outer portion of the support plate; FIG. Fig. 3 shows an embodiment of the arrangement of the thermal expansion compensator of the plate bed with radially displaceable means and of the plate support according to Fig. 2, Fig. 3 and a bottom view of the thermal expansion compensator of the plate bed and 5 of the plate support of Fig. Fig. 3b is a cross-sectional view taken along line AA of Fig. 3, Fig. 4 another exemplary embodiment of the arrangement of the thermal expansion compensator of the platen bed with radially displaceable means and the plate support of Figure 2, Fig. 4a a bottom view of the thermal expansion compensator Fig. 4b is a cross-sectional view taken along line BB of Fig. 4.

DETAILED DESCRIPTION OF THE INVENTION

The invention will be described by way of example of an embodiment of a double circular knitting machine which is arranged in a known manner.

The plate support 6 is mounted on the lower end of the central shaft 1 and the outer portion 42 of the plate support 6 is formed as a substantially horizontal flange, the upper surface of which is supported by screws 43 and radial and axial positioning means 44 6. The disc lock blocks 9 with the disc locks 8 are mounted in a suitable manner on the flange 21 at the lower end 20 of the housing 2 of the central shaft 1 above the plate seat 6.

The machine is equipped with a thermal expansion compensator for the plate bed 6 and the plate bed carrier 4.

In the embodiment shown in FIG. 1, the outer portion 42 of the plate support 6 is weakened at its inner edge by a groove 420 which creates a ring having greater flexibility than the other portions of the outer portion 42 of the plate support 6. The weakened portion of the outer portion 42 of the support 4 of the plate seat 6 and the inner portion 41 of the plate 4 support 4 are connected by a thermal expansion compensator which is formed as an integral part of the plate 4 support 4, e.g. in the embodiment shown in Fig. 1 as a radially elastic U-shaped ring 45 with U-shaped arms facing downwards. The wall thickness of the U-profile is reduced relative to the wall thickness of the other portions 41, 42 of the plate-carrier 6 so that the U-profile exhibits the necessary elasticity in the radial direction while maintaining stiffness in the other directions. When the plate bed 6 is heated by operation of the machine, the outer portion 42 of the plate bed carrier 6 is heated to substantially the same temperature, so that this portion 42 of the plate bed carrier 6 is thermally expanded more than the colder inner portion 41 of the plate bed carrier 6. The difference in expansion of the two portions 41, 42 of the plate-shaped carrier 4 is then compensated by the elastic deformation of the radially elastic ring 45 forming the thermal expansion compensator. In this case, the outer leg U of the profile constituting the radially elastic ring 45 is bent outwardly, whereby the outer portion 42 of the support 4 of the plate 40 of the seat 6 is twisted upwards. This tendency is compensated by the groove 420 at the inner edge of the outer portion 42 of the plate support 6, which causes the outer portion 42 of the plate support 6 to bend downwardly as a result of radially acting forces approximately in the center of gravity of the plate bed assembly 6. The movement of the plate bed 6 during its thermal expansion is therefore horizontal with high accuracy. The thermal deformation balancing of the inner part 41 of the support 4 of the plate seat 6 provided with reinforcing radial ribs 410 on its lower or upper side and further provided with a flange 50 for fixing the support 4 with screws 5 to the central shaft 1 also contributes 45 to this. 6 and the plate-bed carrier 4 is so reduced that the bolts 43 reliably hold it and there is no mutual shear of the plate-bed 6 and the plate-bed carrier 4.

The thermal expansion compensator may also be provided with another suitable profile which exhibits radial elasticity, for example, may be in the form of a thin-walled cylinder 452, 453 (see FIGS. Ia, 1b), or may have an S or Z profile or may be formed by other by appropriate means. However, the principle of the thermal expansion compensator in this part of the double circular knitting machine is always similar to the above-described principle of the thermal expansion compensator with a U-shaped profile.

In another exemplary embodiment, the thermal expansion compensator is formed by another suitable arrangement, and in each case it is exclusively a radially displaceable thermally compensating means.

In all of the above and below described embodiments, centering of the plate bed 6 by the eccentric centering elements 422 shown in the exemplary embodiment of Fig. 1c can be advantageously mounted rotatably about axes parallel to the machine axis on pins 4222 in holes arranged on the periphery of the outer carrier portion 42. The centering elements 422 are rotated by, for example, a hexagonal key inserted into the hexagonal hole 4221. By rotating, the eccentric portion 4223 of the eccentric centering element 422 acts on the centering shoulder 61 of the plate seat 6 and laterally applying forces from the centering elements 422 to the plate seat 6. precisely centered.

In the exemplary embodiment of the thermal expansion compensator shown in FIGS. 2, 3, 3a and 3b, openings 460 are provided in the outer portion 42 of the plate-shaped support 4, provided with pins 461 having a hexagonal bore 4610 at their lower end and / or not shown The pivots 461 are secured in the carrier 4 against spontaneous falling out, for example by means of a locking element 464 mounted on the carrier 4. At the upper end of the pin 461, a pin 462 is placed eccentrically on which the cube 463 fits radially The pegs 462 and the cube 463 are secured by, for example, a snap ring 465. By pivoting the pins 461, the pegs 462 are rotated eccentrically and, as a result, the cubes 463 are displaced, thereby making the poppet 6 accurately center. The plate seat 6 is only attracted to the support by a limited force defined, for example, by the tightening torque used to tighten the screws 43 connecting the plate seat 6 to the carrier 4 or defined by the properties of the disc springs possibly inserted under the heads of the screws 43. It is understood that the arrangement of the pins 461 and the eccentric pins 462 can also be reversed, i.e. the pin 461 is accommodated in the plate seat 6 and the eccentric the pin 462 with the cube 463 are arranged in the outer portion 42 of the plate-shaped support 4.

In the exemplary embodiment of the thermal expansion compensator shown in FIGS. 2, 4, 4a, 4b, pins 471 are disposed in the plate seat 6, at the lower ends of which are eccentric elements 472 supported on cube 473 having guide surfaces corresponding to the walls of radial grooves 421. Also in this embodiment, it is possible to use locking elements, for example in the form of a locking element 474. This embodiment can also be performed in the inverted form, i.e. the pins 471 with the eccentric elements 472 and the cubes 473 are The cubes fit into the radial grooves 421 in the plate seat 6. Also in this embodiment, the arrangement and function of the bolts 43 connecting the plate seat 6 to the carrier 4 and any disc springs under the heads of the screws 43 is utilized.

In the embodiment of Figs. 2, 2a, 2b, 3, 3a, 3b, the plate bed 6 expands more than the colder carrier 4 during warm-up during machine operation, the limited contact force of the fixing screws 43 of the plate bed 6 to the plate 4 carrier 4 a radial displacement of the plate seat 6 and the plate bed carrier 4, in which the pins 461 with cubes 463 and eccentric elements (eg eccentric pin 462, eccentric element 472) prevent unwanted tangential or lateral displacement of the plate seat 6, thereby maintaining machine accuracy and quality of knitting.

-4 CZ 295462 B6

Industrial applicability

The invention is applicable to double circular knitting machines.

Claims (10)

PATENT CLAIMS Double circular knitting machine with a cylindrical bed and a plate bed, wherein the beds carry knitting means and are arranged concentrically about the axis of the machine, the cylindrical bed being arranged on a cylindrical bed support which is rotatably supported in the machine bed and the plate bed is detachably connected a plate-type carrier which is mounted at the lower end of the shaft, which is situated in the upper part of the machine and is synchronously driven by a roller-bed carrier drive, characterized in that the outer part (42) of the plate-carrier (4) the seat (6) and the inner part (41) of the plate support (4) and / or the plate support (4) and the plate seat (6) are connected by a radially resilient ring (45) aligned coaxially with the machine axis and situated between the outer and inner portions (42, 41) of the plate support (4) and / or are u are connected exclusively by radially displaceable means connecting the plate (6) to the plate (6) support (4). Double circular knitting machine according to claim 1, characterized in that the radially elastic ring (45) has a transverse or symmetrical U-shaped cross-section whose arms are facing up or down and one of the arms is connected to the inner part (41) of the carrier (41). 4) a saucer (6) and a second arm connected to an outer portion (42) of the saucer (4) carrier (6). Double circular knitting machine according to claim 1, characterized in that the radially elastic ring (45) has a cross-section comprising a thin-walled cylindrical portion (452) aligned coaxially with the machine axis, the lower part of the thin-walled cylindrical portion (452) being connected to the outer and the upper portion of the thin-walled cylindrical portion (452) is connected to the inner portion (41) of the plate support (4). Double circular knitting machine according to claim 1, characterized in that the radially elastic ring (45) has a profile comprising a thin-walled cylindrical part (453) aligned coaxially with the machine axis, the upper part of the thin-walled cylindrical part (453) being connected to the outer part. (42) the plate-shaped support (4) and the lower portion of the thin-walled cylindrical portion (453) is connected to the inner part (41) of the plate-shaped support (4). Double circular knitting machine according to claim 1, characterized in that the exclusively radially displaceable means connecting the plate bed (6) to the plate bed support (4) are formed by substantially horizontally arranged flanges situated on the outer periphery of the support (4). ) of the plate seat (6) and on the inner circumference of the plate bed (6), the flanges being situated one above the other and in one of the flanges, parallel to the vertical axis of the machine, holes provided with a pin (461) or pin (471) a second, straight or eccentrically arranged end to a radially disposed groove (60, 421) in the second flange, the flanges being coupled together in a vertical direction by means of limited contact force and thermally initiated relative displacement of the flanges exclusively in the radial direction. Double circular knitting machine according to claim 5, characterized in that at the end of the pin (471) or the pin (461) extending into the radially arranged groove (421, 60) in one A flange (463, 473) with a hole parallel to the machine axis and with two parallel walls associated with the walls of said radially disposed groove (421, 60) is situated from the flanges. Double circular knitting machine according to claim 6, characterized in that an eccentric element (472) located in the hole of the cube (473) is rotatably arranged on a pin (471) extending into a radially arranged groove (421) in one flange. Double circular knitting machine according to any one of claims 1 to 7, characterized in that the support (4) of the platen bed (6) is arranged in the form of a plate perpendicular to the machine axis. Double circular knitting machine according to claim 8, characterized in that the plate support (4) is provided with radial ribs (410) on its upper and / or lower side. Double circular knitting machine according to any one of the preceding claims, characterized in that centering eccentric elements (422) are arranged on the outer part of the support (4) of the plate bed (6) and are rotatable about axes parallel to the vertical axis of the machine. and which center the plate seat (6), wherein a centering shoulder (61) associated with the centering eccentric elements (422) is arranged concentrically with the vertical axis of the machine on the plate bed (6).