TWI608136B - Drafting arrangement for a knitting machine - Google Patents

Description

Drafting device for knitting machine

The invention relates to a drafting device for a knitting machine for producing a fiber structure, which is composed of a roving machine with a double apron guided on a apron roller and an output roller pair, wherein the apron roller and the output roller pair Each of the driving rollers is driven by a pressure roller and an electric motor, and the roller and the electric motor are disposed on a front side of a substrate, and the motor shaft is connected to the shaft member of the driving roller mounted in the substrate through the substrate and by a driving device.

This drafting device has been described in the world patent WO 2009/026734 A1. It is used to produce a draft fiber structure from a roving machine and a needle for feeding this directly to the knitting machine. The woven sheet feed from the fiber structure (which has substantially parallel fibers) is lighter than the woven sheet produced from the yarn. If the knitting machine is equipped with this drafting device, the spinning process is not necessary. Knitwear is made directly from the roving machine.

In the known drafting device, all components except the serrated belt for the bottom roller are located on the front side of the substrate of the drafting device. However, the result is that these drafting device components are also exposed to the fiber fly, which is in the fiber structure. It is inevitable during the over-drawing device and it is thus immediately defaced. However, the cleaning operation of the drafting device is rather cumbersome because many components are attached to the front side of the substrate.

Accordingly, it is an object of the present invention to provide a drafting device for a knitting machine in which it is easier to clean because the fibers are less stressed on the assembly.

The object is achieved by a drafting device for a knitting machine for producing a fiber structure, which is composed of a roving machine having a double apron guided to a apron roller and an output roller pair, wherein the apron roller and The output roller pair has a driving roller and an electric motor driven driving roller, and the roller and the electric motor are disposed on a front side of a substrate, and the motor shaft is connected to the driving roller mounted in the substrate through the substrate and by a driving device. The shaft member is characterized in that a clamping device is disposed on the rear side of the substrate, and the pressing roller of the apron roller pair and the output roller pair can be pressed against the driving roller by the clamping device.

A clamping device for pressing the pressure roller toward the drive roller to draw the fiber structure is also disposed on the front side above the pressure roller in the conventional drafting device. Since each of the press rolls must act on the clamping device, there is a relatively large number of components which, when placed on the front side of the drafting device, i.e. on the fiber-passing side, are exposed to the fibers and become dirty. The pressure roller must be cleaned regularly, and even worse, it is not easy to clean the roller pair and the apron, because entering from above will be hindered.

In the drafting device of the present invention, all components of the clamping device are configured On the rear side of the drafting device, where it is not contaminated by the fiber fly and does not obstruct the free access to the roller pair and the apron on the front side. Therefore, the drafting device according to the present invention is obviously easier to maintain than the conventional drafting device.

In a preferred construction of the drafting device, the shaft member of the pressure roller is guided through the opening in the substrate with clearance and moved up and down in the opening by the clamping device. When the clamping device is relaxed, the roller can be moved by hand in the clearance allowed by the opening to facilitate, for example, replacement and/or cleaning of one of the rollers or one of the rollers.

It would be advantageous if the components of the pressure roller were rotatably mounted in the slider on the rear side of the substrate, wherein a spring force could be applied to the slider by the clamping device. The slide mountable on the guide provides precise movement of the press roller shaft member by the spring force generated by the clamping device, wherein the spring force can be generated by a spring associated with each slide.

In this configuration of the clamping device, if the clamping device has a track which is more advantageous, it extends over the slide and is displaceably arranged on the substrate, whereby contact pressure can be generated. The pressure roller can thus be pressed against the drive roller or released by the simple displacement of the track. In this regard, the track can be configured to be displaced in the longitudinal direction on the substrate and can be provided with a cam, wherein the cam of the track acts on a spring that interacts with the slide. It is preferable to use a pin torsion spring as a spring. The spring can be disposed in an adjustable spring block such that the spring force generated by the spring can be adjusted by the displacement of the spring block.

However, the drafting device according to the invention can also have a pneumatic, hydraulic or electric clamping device instead of a mechanical clamping device.

In this case, the clamping device itself can be connected in a conventional manner The rotating rod connected to the clamping device is actuated and stopped. The rotating rod can be disposed outside the substrate housing, which is convenient for access in this case.

The drafting device can be constructed differently depending on the roving to be treated. The 3-roller drafting device is commonly used more frequently, that is, in addition to the apron roller and the output roller, the drafting device can have an input roller pair, and the pressure roller can also act on the clamping device.

A further solution to reduce the fiber fly-staining drafting device is that the motor can be protected from fiber flying by a removable covering. Furthermore, a getter member can be disposed on the pair of output rollers, and the fibers and dust can be drawn therethrough before being accumulated on the drafting device.

Even if the rear side of the drafting device is not in direct contact with the fibrous structure, it can also protect the back side of the substrate by a removable covering.

The invention further relates to a knitting machine, preferably a circular knitting machine, provided with at least one drafting device according to the invention.

10‧‧‧Drawing device

11‧‧‧Substrate

12‧‧‧ front side

13, 14‧‧ ‧ motor

13.1, 14.1‧‧‧ axis

15‧‧‧Input roller pair

15.1, 16.1, 17.1‧‧‧ drive roller

15.2, 16.2, 17.2‧‧‧ pressure roller

15.3, 16.3, 17.3‧‧‧ shaft members

15.4, 16.4, 17.4‧‧‧ shaft members

16‧‧‧Aperture roller pair

17‧‧‧Output roller pair

18‧‧‧ Back side

19‧‧‧Electronics Department

20‧‧‧Mechanical Department

21, 22‧‧‧Sawtooth belt

25‧‧‧Clamping device

26‧‧‧Spring block

27, 28, 29 ‧ ‧ spring

30‧‧‧ Track

31‧‧‧Clamping rod

32‧‧‧ cam

33, 34, 35‧‧‧ skateboarding

36‧‧‧ openings

A preferred exemplary embodiment of a drafting device according to the present invention will be described later with reference to the drawings.

Figure 1 is a perspective view of the front side of the drafting device; Figure 2 is a rear view of the drafting device of Figure 1; Figure 3 is a detailed view of the drafting device of Figure 1 and the clamping device in action; Figure 4 corresponds to Figure Figure 3 is a view of the clamping device which is not in operation; Figure 5 is an enlarged view of the detail of the rear side of the drafting device of Figure 1; Figure 6 is an enlarged view of a detail of the axial passage through the substrate of the drafting device of Figure 1.

The drafting device 10 of Fig. 1 has a substrate 11 on its front side 12 with two motors 13, 14, an input roller pair 15, a pair of apron rollers 16, and an output roller pair 17. Each pair of rollers 15, 16, 17 consists of a lower drive roller 15.1, 16.1, 17.1 and an upper pressure roller 15.2, 16.2, 17.2. The fiber structures to be drawn by the drafting device and not described are individually passed between the press rolls 15.2, 16.2, 17.2 and the drive rolls 15.1, 16.1, 17.1. The desired draft of the fiber structure is achieved by the different speeds of the pair of rolls.

The motors 13, 14 are protected from fiber flying by a cover that has been omitted from Figure 1. Further, one of the suction devices is omitted from the output roller pair 17 for clarity of the drawing.

2 discloses a rear side 18 of the substrate 11, on which an electronic portion 19 of the drafting device 10 and a mechanical portion 20 are disposed. The more precise structure of the mechanical portion 20 is disclosed in Figures 3-6. Both the electronic portion 19 and the mechanical portion 20 are shielded from the outside by a cover of the outer casing. However, the outer cover is not disclosed herein to facilitate the visibility of the components of the drafting device 10.

It can be seen from Figure 3 that the axes 13.1, 14.1 of the motors 13, 14 pass through the substrate 11 to the rear side 18. Here, the shaft member 17.3, which is also driven by the drive roller (output drive roller) 17.1 of the substrate 11, is driven by the shaft 13.1 by a sawtooth belt 21, and the shaft 14.1 is driven by a sawtooth belt 22 and a plurality of pinions. Drive roller (apron drive roller) 16.1 and drive roller (Input drive roller) 15.1 shaft members 16.3, 15.3. A clamping device 25 for the pressure rollers 15.2, 16.2, 17.2 is additionally disposed on the rear side 18 of the substrate 11. It has a spring block 26 in which three springs (e.g., pin torsion springs) 27, 28, 29 are mounted. Further, a rail 30 coupled to a clamping rod 31 is movably mounted in the spring block 26.

In Fig. 3, the track 30 has been moved inward in the direction of the arrow by closing the clamping lever 31. Therefore, the cam 32 (Fig. 4) disposed on the rail is pressed against the springs 27, 28, 29, and the second script body of the spring acts on a slide plate 33, 34, 35, respectively (Fig. 4). The slides 33, 34, 35 are thus pressed downwards.

In Fig. 4, on the other hand, the clamping lever 31 is opened, with the result that the rail 30 is moved outward in the direction of the arrow. Therefore, the cam 32 is no longer in contact with the springs 27, 28, 29, and the sliders 33, 34, 35 are no longer pressed further.

As can be seen from Figures 5 and 6, the shaft members 15.4, 16.4, 17.4 of the press rolls 15.2, 16.2, 17.2 are individually mounted in the slide plates 33, 34, 35. In this case, the shaft members 15.4, 16.4, 17.4 pass through the opening 36 in the substrate 11 with clearance. If the slides 33, 34, 35 are not pressed down by the clamping device 25, the pressure rollers 15.2, 16.2, 17.2 are also moved downwards and thus the necessary contact pressure for the fiber structure is produced against the drive rollers 15.1, 16.1, 17.1. . However, if the clamping device 25 does not operate (Fig. 4), the pressure rollers 15.2, 16.2, 17.2 can be moved upwards by hand as long as the clearance between the shaft members 15.4, 16.4, 17.4 and the opening 36 is allowed.

10‧‧‧Drawing device

11‧‧‧Substrate

12‧‧‧ front side

13, 14‧‧ ‧ motor

15‧‧‧Input roller pair

15.1, 16.1, 17.1‧‧‧ drive roller

15.2, 16.2, 17.2‧‧‧ pressure roller

16‧‧‧Aperture roller pair

17‧‧‧Output roller pair

Claims (14)

A drafting device for a knitting machine for producing a fiber structure, which is composed of a roving machine having a double apron guided to a pair of apron rolls and an output roller pair, wherein the pair of apron rolls and the pair of output rollers are individually a driving roller driven by a pressing roller and an electric motor, wherein the pressing roller and the driving roller and the electric motor are disposed on a front side of the substrate, and the motor shaft is connected to the substrate mounted in the substrate through the substrate and by a driving device The shaft member of the driving roller is characterized in that the clamping device is disposed on the rear side of the substrate, and by the clamping device, the pair of apron rollers and the pair of output rollers can press against the driving roller. The drafting device of claim 1, wherein the shaft member of the pressure roller is guided through an opening in the substrate and has a clearance and is moved up and down in the opening by the clamping device. The drafting device of claim 1 or 2, wherein the shaft member of the pressure roller is rotatably mounted in the slider on the rear side of the substrate, wherein the spring force can be applied to the slider by the clamping device skateboard. A drafting device of claim 3, wherein each of the slides has an associated spring. A drafting device according to claim 3, wherein the clamping device has a rail extending above the sliding plate and displaceably disposed on the substrate, whereby contact pressure can be generated. A drafting device according to claim 5, wherein the track is configured to be longitudinally displaceable on the substrate and provided with a cam, wherein the cam of the track acts on the spring that interacts with the slide. A drafting device according to claim 3, wherein the spring system Pin torsion spring. The drafting device of claim 3, wherein the spring is disposed in the adjustable spring block. A drafting device according to claim 1 or 2, wherein the clamping device is actuatable by a manually operated clamping rod. The drafting device of claim 1 or 2, wherein the input roller pair is separately disposed on the substrate, and the pressing roller of the input roller pair can also be acted upon by the clamping device. A drafting device according to claim 1 or 2, wherein the electric motor is protected from fiber flying by a removable covering. A drafting device according to claim 1 or 2, wherein the getter member is disposed on the pair of output rollers. A drafting device according to claim 1 or 2, wherein the rear side of the substrate is protected from fiber flying by a removable outer casing cover. A knitting machine having at least one drafting device according to any one of claims 1 to 13.