TWI796327B - Circular knitting machines and sinker cam for circular knitting machines - Google Patents

Abstract

A sinker cam for circular knitting machines, in particular for single jersey machines, having at least one cam part (3), disposed on a cam carrier (1), for controlling deployment and retraction movements of sinkers, wherein the cam part (3) in relation to the cam carrier (1) is adjustable in the movement direction of the sinkers, and wherein the cam part (3) is disposed directly on the cam carrier (1), and an adjustment part (4) by way of which the cam part (3) is adjustable in relation to the cam carrier (1) is provided.

Description

Circular knitting machine and sinker cam for circular knitting machine

The present invention relates to a sinker cam for circular knitting machines, especially for single jersey knitting machines, which has at least one cam member arranged on a cam carrier to control the unfolding and retracting movement of the sinker, wherein relative to the cam carrier The triangle piece is adjustable in the direction of movement of the sinker.

Sinker cams in which the sinker cam is fixedly assembled on a cam carrier are known and widely used. However, these cams are not suitable for fine gauge machines beyond E44 because the cams are not adjustable, yet adjustments to the cams are required to equalize manufacturing tolerances at fine gauges.

In the case of machines with very fine gauges, in order to fine-tune the position of the sinker cams to equalize manufacturing tolerances, it has hitherto typically been used sinker cam segments, which are fixedly screw-locked to the sinker cam carrier and have a Adjustment piece for sinker triangle. The sinker triangle is in This is then configured so as to be longitudinally displaceable on the underside of the sinker triangular segments.

However, the sinker cam segment protrudes relatively far beyond the sinker cam carrier and sinker cam piece, so as to obstruct the view of the machine's sinker and cylinder pins. Furthermore, it is difficult to access cylindrical needles. A further disadvantage of the known sinker cams is that the thread fluff can only be blown off from the knitting to an insufficient degree. The fluff tends to accumulate in the cavities between the sinker and the triangular segments of the sinker.

European Patent Application No. 1 559 820 A1 describes an adjustment mount for a triangle, wherein the adjustment mount is arranged in a triangle carrier which allows longitudinal adjustment of the triangle by engaging a separate adjustment element on the underside of the triangle pieces. However, this adjustment mount requires a specially designed triangular carrier to have clearance for the adjustment elements.

The object of the present invention is therefore to provide a sinker cam which has an adjustable sinker cam and which avoids the above-mentioned disadvantages.

This object is achieved by a sinker cam for circular knitting machines, especially for single jersey knitting machines, having at least one cam arranged on a cam carrier to control the unfolding and retracting movement of the sinker, wherein the relevant The cam on the cam carrier is adjustable in the direction of movement of the sinker; the sinker cam is characterized in that the cam is arranged directly on the cam carrier, and is characterized in that it is provided with an adjustment piece, which is integrated in the cam or the cam carrier , the cam is adjustable relative to the cam carrier by means of the adjustment piece.

The sinker cam according to the invention dispenses with sinker cam segments. The cams are instead configured so as to be displaceable directly on the sinker cam carrier. The build height of the triangle is thus significantly lower than in the case of the sinker triangle with triangle segments. Observation of the knit with sinker and needles is not obstructed. Furthermore, the thread fluff can be easily removed from the knitting, which deposits on the sinker cam to a lesser extent than is the case with known cams. The required adjustability of the triangle is here maintained to the fullest extent. The sinker cam according to the invention further allows the adjustment of the sinker cam required when a specific pattern is to be knitted. Furthermore, the triangular piece can also be constructed in two pieces in order to adapt to different patterns, that is to say have replaceable parts. In the case of switching patterns, only replaceable parts of the triangles and not all parts have to be replaced, due to which there is a significant saving of material.

In a preferred design embodiment of the cam, the cam is pressed against the cam carrier so as to be pre-tensioned by the spring, and by overcoming the friction between the cam carrier surface and the underside of the cam, the cam by The adjustment member is adjustable relative to the triangular carrier. Because of the spring pretension, any undue displacement of the triangle on the triangle carrier is avoided without impairing the adjustability of the triangle by means of the adjusting element.

For this purpose, the cam can preferably be fixed to the cam carrier by means of at least one screw with disc springs, wherein the screw is guided in the cam by means of an elongated bore or a bore with a diameter larger than the screw shank middle. The elongated bore allows the triangle to be displaced by the adjustment piece. The screws can also be screw-locked into the triangle carrier, thus tilting in the direction of adjustment of the triangle.

It is more convenient to integrate the adjusting part into the triangle. Adjustment Components may also be integrated in triangular vectors. However, mounting in a cam offers the advantage that the cam can be used in all machine situations, regardless of machine build and gauge.

Furthermore, it is also possible to provide a common adjustment element for several triangle elements.

The adjustment piece may have a rotatable setting head connected to a pin which engages in a helical groove in the adjustment piece or triangular carrier. The adjustment thus corresponds to the stitch length adjustment, which is already used in the case of known cams. The setting head can be turned by a box wrench and the sinker triangle can be displaced accordingly. Discs or rings provided with rulers can here be arranged in a known manner on the setting head in order to facilitate the setting of the triangle position.

However, the adjustment element can also be arranged on the end side of the cam, wherein the cam is adjustable by means of a pinion, toothed rack or worm gear.

In order to prevent lateral displacement of the cam on the cam carrier, guides can be provided which prevent the cam from moving perpendicularly to the longitudinal movement of the sinker. A cylindrical pin or feather key engaging in a longitudinal groove can be regarded as a guide, for example, wherein the cylindrical pin or feather key is preferably arranged on a triangular piece. The use of a feather key here has the advantage that the feather key bears in the groove in a planar and not only linear manner. However, recesses for receiving and guiding the triangle can also be provided in the triangle carrier.

The triangular carrier can be constructed in the form of rings or ring segments, and at least one cam can be adjustable in a radial direction with respect to the triangular carrier. A sinker cam constructed in this way is often found in circular knitting machines where the sinker moves perpendicular to the needles. However, the present invention (that is, will The cam is directly configured on the cam carrier, while eliminating the sinker cam segment and maintaining the adjustability of the cam) can also be applied to other sinker cams. It is also not necessary to align the sinker perpendicular to the needle of the associated machine. The sinker cam according to the invention can also be used in machine situations where the sinker is arranged at another angle with respect to the needle, or where the sinker is arranged parallel to the needle.

The invention also relates to a circular knitting machine with a sinker cam according to the invention. The machine here can preferably be a single jersey machine and/or have a gauge of at least 28 needles per inch. Machines with a very fine gauge of at least 44 needles per inch having a sinker cam according to the invention are particularly advantageous.

1: Triangular carrier

3: triangle piece

3': triangle piece

3.1': first piece

3.2': replaceable second piece

4: Adjustment parts

4': Adjustment piece

4.1: Setting header

4.2: Opening

4.3: Ring

4.4: Pins

4.5: Spiral groove

6: screw

7: disc spring

8: Boring

9: Director

9.1: Pins

9.2: Longitudinal grooves

10: triangle

100: sinker triangle

101: Triangular Carrier

102: sinker triangular fragment

103:Sinker triangle piece

104: Adjustment parts

105: sinker

Preferred exemplary embodiments of the sinker cam according to the present invention will be explained in more detail below with reference to the drawings in comparison with cams according to the prior art.

In the drawings, in detail: FIG. 1 shows a view of a sinker cam according to the prior art; FIG. 2 shows a plan view of part of a sinker cam according to the present invention; FIG. 3 shows a cross-section of the sinker cam of FIG. 2; and FIG. 4 Side view showing a two-piece sinker triangle.

100 sinker triangles according to the prior art shown in Fig. 1 There is an annular cam carrier 101 on the upper side of which a plurality of sinker cam segments 102 (three are shown in an exemplary manner in FIG. 1 ) are arranged. The sinker cam segment 102 is fixedly screw-locked to the cam carrier 101 . The sinker cam 103 with the control curve for the sinker 105 is arranged on the underside of this sinker cam segment 102, wherein the sinker cam 103 for fine adjustment is arranged in each case on the cam segment 102, This is so as to be displaceable in a radial direction with respect to the triangular carrier 101 . In each case an adjustment element 104 accessible from the upper side of the cam segment 102 is provided for adjusting the sinker cam 103 . Due to the relatively large build height of the triangular segment, observation of the sinker 105 and cylindrical needle is severely compromised. Furthermore, fiber fluff may accumulate between the sinker 105 and the triangular segment 102 .

A sinker cam 10 according to part of the present invention is illustrated in FIG. 2 . In the case of this cam 10 , cam segments have been dispensed with and the sinker cam 3 is instead assembled directly on the annular cam carrier 1 . The sinker cam 3 here is in each case held against the upper side of the cam carrier 1 by a screw 6 with a disk spring 7 . The screw 6 is here guided through the cam 3 via an elongated bore (see FIG. 3 ) or a bore 8 with a diameter larger than the screw shank, so that the cam 3 can be positioned between the cam 3 and the cam carrier 1 Displacement in the radial direction of the triangular carrier 1 at the same time as the friction force. In order to be able to achieve this radial adjustment, the adjustment element 4 is arranged in the sinker triangle 3 . The triangle is guided laterally by guides 9 during the displacement movement.

As highlighted in FIG. 3 , the adjustment member 4 has a setting head 4.1 with an opening 4.2 to receive a socket wrench (not shown). The ring 4.3 that is provided with ruler gauge is then located on the outer periphery of setting head 4.1, can check triangle 3 better like this adjustment. The setting head 4.1 interacts with a cylindrical pin 4.4 which is guided in a helical groove 4.5 of the adjustment piece 4 . The lateral guides 9 are formed by cylindrical pins 9.1 which are guided in longitudinal grooves 9.2 of the triangular carrier 1 .

Figure 4 shows a two-part triangle 3' consisting of a first part 3.1' with an adjustment part 4' according to the invention and an alternative second part 3.2'. This picture shows that the two pieces 3.1' and 3.2' are separated. The two pieces 3.1', 3.2' can be connected to each other by screws, and can also be connected to a triangular carrier (not shown here). Fine adjustment of the triangle 3' (for example to equalize manufacturing tolerances) can be done by means of the adjustment part 4'. However, the replaceable second piece 3.2' of the cam 3' can be replaced by another one if the knitting machine is switched to another pattern requiring greater adjustment of the cam 3'. However, the first piece 3.1' with the adjustment piece 4' remains on the triangular carrier.

1: Triangular carrier

3: triangle piece

4: Adjustment parts

4.1: Setting header

4.2: Opening

4.3: Ring

4.4: Pins

4.5: Spiral groove

6: screw

7: disc spring

8: Boring

9: Director

9.1: Cylindrical pins

9.2: Longitudinal grooves

Claims (12)

A sinker cam for circular knitting machines, the sinker cam is particularly useful for single jersey knitting machines, which has at least one cam (3) arranged on a cam carrier (1) to control the movement of the sinker (105) Expanding and retracting movement, wherein the cam (3) relative to the cam carrier (1) is adjustable in the direction of movement of the sinker (105); the sinker cam is characterized in that the cam ( 3) directly arranged on the triangular carrier (1), and characterized in that an adjustment piece (4) is provided, which is integrated in the triangular piece (3), and the triangular piece (3) is adjusted by means of the triangular piece (4) Relative to the triangular carrier (1) is adjustable. According to the sinker cam of claim 1, wherein the cam piece (3) bears on the cam carrier (1) so as to be pre-tensioned by a spring, and by overcoming the surface of the cam carrier and the cam friction between the undersides of the triangular parts, the triangular part (3) is adjustable relative to the triangular carrier (1) by means of the adjusting part (4). The sinker cam according to claim 2, wherein the cam (3) is fixed to the cam carrier (1) by at least one screw (6) with disc springs (7), wherein the screw (6) ) is guided in the triangle (3) by means of an elongated bore or a bore (8) with a larger diameter than the screw shank. According to the sinker cam of item 3 of the scope of patent application, wherein the screw (6) is screwed into the cam carrier (1), so as to adjust the cam part (3) Slope in the direction of the entire path. According to the sinker cam according to any one of items 1 to 4 of the scope of application, a common adjustment piece (4) is provided for a plurality of cam pieces (3). The sinker cam according to any one of claims 1 to 4, wherein the adjustment member (4) has a rotatable setting head (4.1) connected to a pin (4.4), the pin (4.4) Engaged in the helical groove (4.5) in the adjustment piece (4) or the triangular carrier (1). According to the sinker cam according to any one of the claims 1 to 4 of the patent application, wherein the adjustment piece (4) is arranged in the end side of the cam piece (3), wherein the cam piece is connected by a gear, a rack or a worm gear And relative to the triangular carrier is displaceable. The sinker cam according to any one of claims 1 to 4 of the patent application, wherein a guide (9) is provided to prevent the cam (3) from moving perpendicular to the longitudinal movement of the sinker (105) . The sinker cam according to claim 8, wherein the guide (9) is formed by a cylindrical pin (9.1) or a feather key engaged in a longitudinal groove (9.2). According to the sinker triangle of any one of items 1 to 4 of the scope of patent application, Wherein the triangular carrier (1) is constructed in the form of a ring or a ring segment, and the at least one triangular piece (3) is adjustable in the radial direction of the triangular carrier (1). A circular knitting machine, which has the sinker cam according to any one of items 1 to 10 in the scope of the patent application. Circular knitting machine according to claim 11, wherein the circular knitting machine has a gauge of at least 28 needles per inch.

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