CN110546318B

CN110546318B - Sinker cam for circular knitting machine and circular knitting machine

Info

Publication number: CN110546318B
Application number: CN201880026709.5A
Authority: CN
Inventors: D·特伦克勒; Z·赖克; M·沃勒布; B·博斯
Original assignee: Sipra Patententwicklungs und Beteiligungs GmbH
Current assignee: Sipra Patententwicklungs und Beteiligungs GmbH
Priority date: 2017-04-24
Filing date: 2018-04-04
Publication date: 2021-12-28
Anticipated expiration: 2038-04-04
Also published as: PT3615722T; EP3615722A1; EP3615722B1; CN110546318A; JP2020517839A; KR20190138649A; DE102017108676A1; TWI796327B; WO2018197166A1; KR102534407B1; JP7071396B2; TW201839199A

Abstract

A sinker cam for circular knitting machines, in particular for single-jersey knitting machines, having at least one triangular piece (3) arranged on a cam carrier (1) for controlling the withdrawal and withdrawal movement of the sinker, wherein the triangular piece (3) is adjustable relative to the cam carrier (1) in the direction of movement of the sinker and wherein the triangular piece (3) is arranged directly on the cam carrier (1) and is provided with an adjusting piece (4) integrated into the triangular piece (3), by means of which the triangular piece (3) can be adjusted relative to the cam carrier (1).

Description

Sinker cam for circular knitting machine and circular knitting machine

Technical Field

The invention relates to a sinker cam for circular knitting machines, in particular for single-jersey knitting machines, having at least one triangular part arranged on a cam carrier for controlling the withdrawal and withdrawal movements of the sinker, wherein the triangular part is adjustable relative to the cam carrier in the direction of movement of the sinker.

Background

Sinker cams are known and have a number of applications in which the sinker cam parts are fixedly fitted on the cam carriers. However, these cams are not suitable for high-fineness knitting machines above E44, since these cam elements are not adjustable, however, at high fineness, adjustment of the cam elements is required to compensate for machining tolerances.

In order to fine-tune the position of the sinker cam part in knitting machines with very fine gauge to compensate for machining tolerances, it has therefore hitherto been customary to use sinker cam sections which are fixedly screwed to the sinker cam carrier and have an adjustment for the sinker cam part. At this time, the sinker triangle part is longitudinally movably disposed on the lower side of the sinker triangle section.

However, the sinker cam section projects relatively far beyond the sinker cam abutment and the sinker cam parts, thus obstructing the view of the sinker and cylinder needle of the machine. Furthermore, access to the cylinder needle is very difficult. A further disadvantage of the known sinker cam is that the yarn pile is only insufficiently blown away from the knitting location. This fluff tends to collect in the shallow pits between the sinker and the sinker cam section.

Patent document EP 1559820 a1 describes an adjustment device for a triangular piece, wherein the adjustment device is arranged in a triangular support and allows longitudinal adjustment of the triangular piece by means of a separate adjustment element acting on the underside of the triangular piece. However, this adjustment device requires a specially designed triangular support with a recess for the adjustment element.

Disclosure of Invention

It is therefore an object of the present invention to provide a sinker cam having adjustable sinker cam parts and avoiding the disadvantages described above.

This object is achieved by a sinker cam for circular knitting machines, in particular for single-jersey knitting machines, having at least one triangular part arranged on a cam carrier for controlling the withdrawal and withdrawal movements of the sinker, wherein the triangular part is adjustable relative to the cam carrier in the direction of movement of the sinker, and characterized in that the triangular part is arranged directly on the cam carrier and is provided with an adjusting part integrated into the triangular part, by means of which the triangular part can be adjusted relative to the cam carrier.

The sinker cam according to the invention dispenses with the sinker cam section. Instead, the triangular part is directly movably arranged on the sinker cam carrier. The overall height of the cam is thus significantly smaller than in a sinker cam with cam sections. The view to the knitting site with sinkers and needles is not obstructed. Furthermore, the knitting site can simply be cleaned of yarn fluff, which is deposited, moreover, to a lesser extent on the sinker triangle than in the known cams. At this point, the adjustability of the triangular members to achieve the desired results is maintained throughout the entire periphery. Furthermore, the sinker cam according to the invention allows adjusting the sinker cam components when a determined pattern to be woven is required. In order to adapt to different patterns, the triangular part can also be designed in two parts, i.e. with replaceable sections. In this way, it is not necessary to replace all triangle parts when changing the pattern, but only the replaceable sections, as a result of which a significant material saving is achieved.

In a preferred embodiment of the triangle, the triangle part rests on the triangle support under the influence of a spring pretensioning force and can be adjusted relative to the triangle support by the adjusting element while overcoming the friction between the surface of the triangle support and the underside of the triangle part. Due to the spring pretensioning, unintentional displacement of the triangular part on the triangular support is avoided, without this hindering the adjustability of the triangular part by the adjusting part.

For this purpose, the triangular part can preferably be fastened to the triangular support by means of at least one screw with a disk spring, wherein the screw is guided through an elongated hole or bore in the triangular part, which has a larger diameter than the screw shaft. The slotted hole realizes the movement of the triangular component through the adjusting component. The screw can also be screwed into the triangular support obliquely in the adjustment direction of the triangular part.

It is also expedient to integrate the adjusting element into the triangular element. The adjusting element can also be integrated into the tripod. However, the mounting into the triangular pieces provides the advantage that the triangular pieces can be used in all knitting machines regardless of the structure and fineness of the knitting machine.

Furthermore, a common adjustment element may also be provided for a plurality of triangular elements.

The adjusting element may have a rotatable adjusting head which is connected to a pin which engages into a helical groove in the adjusting element or the triangular support. The adjusting element thus corresponds to a sinking adjusting element already used in known triangles. The adjusting head can be rotated by means of a socket wrench and the sinker cam is moved thereby. In a known manner, a graduated disk or ring can be arranged on the adjusting head in order to make the adjustment of the position of the triangle easier.

However, the adjusting element can also be arranged on one end side of the triangular element, wherein the triangular element can be adjusted by means of a gear, a toothed rack or a worm gear.

In order to avoid lateral movement of the triangular part on the triangular support, a guide device can be provided which prevents the triangular part from moving perpendicular to the longitudinal direction of movement of the sinker. As a guide, for example, a cylindrical pin or a key engaging in a longitudinal groove can be considered, wherein the cylindrical pin or the key is preferably arranged on the triangular part. The use of a key has the advantage that the key lies flat and not only linear in the groove. However, recesses for receiving and guiding the triangular parts can also be provided in the triangular supports.

The triangular support can be designed in the form of a ring or ring segment, and at least one triangular part can be adjusted in the radial direction relative to the triangular support. In circular knitting machines, such a design of the sinker cam is usual, wherein the sinker moves perpendicularly to the needle. However, the invention (that is to say the triangular parts are arranged directly on the triangular supports in the case of omitting the sinker cam sections but maintaining the adjustability of the triangular parts) can also be transferred to other sinker cams. Nor is it necessary for the sinker to be oriented perpendicularly with respect to the needles of the knitting machine. The sinker cam according to the invention can also be used in knitting machines in which the sinkers are arranged at different angles or parallel to the needles.

The invention further relates to a circular knitting machine having a sinker cam according to the invention. The circular knitting machine is preferably a single jersey knitting machine and/or has a fineness of at least 28 needles/inch. Particularly advantageous are knitting machines with sinker cams according to the invention having a very high fineness of at least 44 needles/inch.

Drawings

In the following, a preferred embodiment of the sinker cam according to the invention is explained in detail in comparison with a cam according to the prior art with reference to the drawings.

In which are shown in detail:

fig. 1 shows a schematic view of a sinker cam according to the prior art;

fig. 2 shows a partial top view of a sinker cam according to the invention;

fig. 3 shows a cross section of the sinker cam in fig. 2;

fig. 4 shows a side view of a two-piece sinker triangle.

Detailed Description

The sinker cam 100 according to the prior art shown in fig. 1 has an annular cam carrier 101, on the upper side of which a plurality of sinker cam sections 102 are arranged, three sinker cam sections being shown by way of example in fig. 1. The sinker cam section 102 is fixedly screwed to the cam support 101. On the lower side of the sinker cam sections, in each case a sinker cam part 103 is arranged with a control curve for the sinkers 105, wherein the sinker cam parts 103 are arranged on the cam sections 102 in a manner movable in the radial direction relative to the cam carrier 101 for fine adjustment. For adjusting the sinker cam 103, adjusting elements 104 are respectively provided in the cam sections, which adjusting elements 104 are accessible on the upper side of the sinker section 102. Due to the relatively large structural height of the triangular section, the view to the sinker 105 and the cylinder needle is severely limited. In addition, fiber fluff may collect between the sinker 105 and the triangular section 102.

In fig. 2, a part of a sinker cam 10 according to the invention is shown. In this cam 10, the cam section has been omitted and instead the sinker cam part 3 is fitted directly on the annular cam carrier 1. At this time, the sinker cam members 3 are pressed toward the upper side of the cam holder 1 by the screws 6 with the disc springs 7, respectively. The screw 6 can be guided through the triangular part 3 by means of a slot or hole 8, which is shown in fig. 3 and has a larger diameter than the screw shaft, so that the triangular part 3 can be moved in the radial direction of the triangular support 1 against the frictional forces between the triangular part 3 and the triangular support 1. To achieve this radial adjustment, an adjusting element 4 is provided in the sinker cam 3. During the displacement movement, the triangular pieces are guided laterally by the guide means 9.

As fig. 3 shows, the adjusting part 4 has an adjusting head 4.1 with an opening 4.2 for receiving a socket wrench (not shown). A graduated ring 4.3 is provided on the outer periphery of the adjustment head 4.1 to enable better control of the adjustment of the triangular members 3. The adjusting head 4.1 interacts with a cylindrical pin 4.4, which is guided in a helical groove 4.5 in the adjusting element 4. The lateral guide 9 is formed by a cylindrical pin 9.1 in a longitudinal groove 9.2 in the tripod 1.

Fig. 4 shows a two-part triangular part 3 'comprising a first part 3.1' provided with an adjusting piece 4 'according to the invention and an exchangeable second part 3.2'. The figures show the two parts 3.1 'and 3.2' in a separated state. By means of screws, the parts 3.1', 3.2' can be connected both to one another and to a tripod, not shown here. By means of the adjusting element 4', a fine adjustment of the triangular element 3' can be carried out, for example to compensate for machining tolerances. However, if switching the knitting machine to another pattern requires more adjustment of the triangular part 3', the exchangeable part 3.2' of the triangular part 3' can be exchanged for another exchangeable part. Instead, the part 3.1 'with the adjusting element 4' remains on the triangular support.

Claims

1. Sinker cam for a circular knitting machine, having at least one triangular piece (3) arranged on a cam carrier (1) for controlling the drive-out and pull-back movement of a sinker (105), wherein the triangular piece (3) is adjustable in the direction of movement of the sinker (105) relative to the cam carrier (1), characterized in that the triangular piece (3) is arranged directly on the cam carrier (1) and is provided with an adjusting piece (4) integrated into the triangular piece (3), with which the triangular piece (3) can be adjusted relative to the cam carrier (1).

2. The sinker cam according to claim 1, wherein the triangular part (3) rests against the cam abutment (1) under the influence of a spring pretension and can be adjusted relative to the cam abutment (1) by the adjusting element (4) against friction between the cam abutment surface and the underside of the cam part.

3. The sinker cam according to claim 2, wherein said triangular parts (3) are fixed to the cam carrier (1) by means of at least one screw (6) with a belleville spring (7), wherein said screw (6) is guided through a hole (8) in the triangular part (3) having a larger diameter than the screw shank.

4. The sinker cam according to claim 3, wherein said screw (6) is screwed into the cam abutment (1) obliquely in the direction of the adjustment travel of the cam element (3).

5. The sinker cam according to any one of claims 1 to 4, characterized in that a common adjusting piece (4) is provided for a plurality of triangular pieces (3).

6. The sinker cam according to any of claims 1 to 4, characterized in that said adjusting piece (4) has a rotatable adjusting head (4.1) connected with a pin (4.4) engaged in a helical groove (4.5) in the adjusting piece (4) or in the cam support (1).

7. The sinker cam according to any of claims 1 to 4, characterized in that the adjusting piece (4) is arranged on the end side of a triangular piece (3), wherein the triangular piece is movable relative to the cam support by means of a gear, rack or worm gear transmission.

8. The sinker cam according to any one of claims 1 to 4, characterized in that there are guide means (9) which prevent the movement of the triangular pieces (3) perpendicular to the longitudinal direction of movement of the sinkers (105).

9. The sinker cam according to claim 8, characterized in that said guiding means (9) are formed by cylindrical pins (9.1) or keys engaged in longitudinal grooves (9.2).

10. The sinker cam according to any of claims 1 to 4, wherein said cam abutment (1) is configured in an annular or ring-segment shape, and said at least one cam feature (3) is adjustable in the radial direction of the cam abutment (1).

11. The sinker cam according to any one of claims 1 to 4, designed for use in a single jersey knitting machine.

12. The sinker cam according to claim 3, characterized in that said holes (8) are elongated holes.

13. A circular knitting machine having a sinker cam according to any one of claims 1 to 12.

14. The circular knitting machine as in claim 13, characterized in that the circular knitting machine has a fineness of at least 28 needles/inch.