PT93182B - MECHANICAL ASSEMBLY DEVICE - Google Patents

Abstract

Mechanical dismantling device in a circular knitting machine, in particular with double cylinder. The device consists of two circular parts, one of these being solid and fitting inside the other part, while the fabric passes between them. In one of the parts is a surface similar to the thread of a screw, the adjacent surface of the other part being circular and its inclination being identical to that of the surface in the form of a screw thread. One of the parts does not rotate, whilst the other rotates in a forced manner and is coupled to the needle cylinder. Figure 1. <IMAGE>

Description

The present invention relates to a disassembly mechanism on a circular knitting machine, in particular on a double cylinder knitting machine.

It is known that different types of mechanical disassembly devices are used in double cylinder knitting machines for the production of socks, to disassemble products.

Machines are known, as described in the Czechoslovakian authorship certificate 185 999, in which the disassembly mechanism comprises vertically movable working elements, arranged in a circle. The vertical movement of the working elements is controlled by a fixed cam and springs. The working ends of said elements are made in the form of flexible blades. Said device works reasonably reliably, except for jacquart disassembly, where bars are sometimes visible. Said bars cause an irregular disassembly between neighboring work elements.

aforementioned inconvenience is eliminated by a mounting device described for example in Czechoslovakian authorship certificate 221 149, where there is a

disassembly pin that holds the fabric during the edge weave and, during the continuation of the weave, disassembles it due to the action of a pneumatic mechanism. Said device practically eliminates longitudinal bars, but it is relatively complicated, takes up space and requires the supply of compressed air to the machine. Another drawback is that it does not allow you to knit panties due to the elevation of the device, or else the elevation must be carried out in two parts, evidently with the extension of the time necessary to knit a product.

When the knitted fabric is of low density, that is, with great extensibility, the formation of creases in the fabric is verified.

The object of the present invention is to eliminate these drawbacks, which is achieved mainly so that the device comprises two circular parts coaxially arranged, the fabric passing between them, providing the surface of one of the parts in contact with the fabric with a screw-shaped surface and one being mounted non-rotatingly.

The advantage of the present invention lies in the fact that the device is very simple, requiring no driving or maintenance. Due to the fact that it acts around the entire periphery of the fabric with continuous traction, it completely eliminates the creation of longitudinal bars and practically allows to knit products with indefinite length and even replaces a disassembly cylinder. In addition, it makes the fabric surface smooth and the quality of the fabric is better. The device does not need to be adjusted and has practically no wear, which guarantees a long life. Malfunctions ie operation are also completely eliminated. The device can function for both upper and lower mounting.

The accompanying drawings illustrate embodiments according to the present invention, given as examples. The figures in the drawings represent:

Fig. ₁₅ a schematic arrangement of the disassembly device in the operating position, on a circular double bed knitting machine;

of device in Fig. disassembly 2, at a detail of the two non-operative position; parts of device in Fig. mounting on 3, a detail of the two operative position; parts of device in Fig. disassembly 4, at a detail of the two non-operative position, parts being at surfaces in formed on the basis of surfaces

cylindrical;

Fig. 5, a representation similar to that of fig. 4, but the parts are in the operative position;

Fig. 6, another embodiment of the two parts in the operating position;

Fig. 7, an illustration of the screw-shaped surface of the upper part according to fig. 6, seen from below; and

Figs. 8 and 9, illustrations similar to those in fig. 2 and 3, but with the screw-shaped surface in the second part.

A double cylinder circular knitting machine for the production of socks is provided with a lower and an upper needle cylinder (1) and (2), in which double-headed needles (3) and, also known, monkeys ( not shown) to control the needles (3). To form the stitches, the machine is also equipped with shock punches (4) on the lower needle cylinder (1) and with fixed compressor punches (5) on the upper needle cylinder (2). The shock punches (3) are controlled by fixed cam rings (6,7) mounted on a non-rotating tube (8).

The machine is equipped with a mechanical disassembly device that comprises the following parts. In the lower needle cylinder (1) there is a part (10)

with a funnel shape with a central opening for the passage of the fabric mounted fixed on a rotating inner disassembly tube (9). In the upper needle cylinder (2), a portion (11) capable of sliding axially is mounted, the working part of which is formed as a conical outer surface in the form of a screw (110). The two parts (10) and (11) adjust each other, while the internal inclination of the conical surface (100) (fig. 2) of the part (10) is equal to that of the conical surface (110) in the form of a screw. The two parts (10) and (11) are placed coaxially, while the part (11) is rotatably mounted and with the possibility of sliding in rings (12) and (13) that are mounted fixed in an inner tube (14) of the needle cylinder (2), while the tube (14) rotates with the needle cylinder (2). At the upper end of the part (11) a lever (15) is mounted with the possibility of oscillating on a support (16) on the upper flage (17) of the machine. The other lever arm (15) is controlled by the machine's control drum via a shown kinematic transmission.

operation of the aforementioned device is as follows: at the beginning of the operation of knitting the fabric, that is, the hem, the part (11) is raised so that the device is out of service. The fabric (P) increases in length, while contracting towards the center due to the placement of elastic thread. After finishing the edge weave, the part (11) (fig. 3) is lowered by a command from the command drum. The fabric (P) is compressed by the conical surface (111) in the form of a screw on the inner conical surface (110). The pressure of the part (11) causes the fabric (P) to be dragged by the rotating part (10). Due to the rotation, the fabric (P) is in fact screwed onto the conical surface (110) in the form of a screw, thus being pulled and removed from the needles (3). After finishing the knitting operation, the part (11) is lifted by a command from the control drum and the fabric is thrown out of the needles (3).

There are several modifications that can be made within the scope of the present invention. The operation of the parts (10) and (11) can be done in reverse order. The upper part (11 ') (fig.8) is provided with a conical surface (110') and the lower part (10 ') with a conical screw-shaped surface (100'). When fitting the part (11 ') to the part (10') (fig. 9), the fabric is subjected to tension and removed by the part (10 '). Another modification that does not represent any change in the solution principle is the change of the rotation location. The lower part (10) or (10 ') is placed non-rotating and the upper part (11) or (11') is mounted as a driven part.

In addition, the surfaces through which the parts fit together do not need to be conical, for example they can be cylindrical, as can be seen in the parts (11q) and (10a) in figs. 4 and 5, or they can be formed on flat faces adjacent to the parts (11b) and (10b) (fig. 6 and 7).

In addition, the disassembly device can be arranged for upper disassembly so that the part with the opening, for example the part (10), is arranged in the upper needle cylinder and the full part, for example the part (11), in the bottom cylinder. In this case, it is possible that the full part in the lower needle cylinder is not likely to move axially and the part with the opening for the passage of the fabric may move axially.

device according to the present invention can be used even in simple cylindrical knitting machines and also in large diameter knitting machines.

Claims (5)

- l ^â Mechanical disassembly device in a circular knitting machine, in particular in a double cylinder knitting machine, characterized by comprising two circular parts (10,11,10 ', 11', 10a, 11a, 10b, 11b) coaxially arranged , between which the fabric (P) passes while one of them is provided on the surface that comes into contact with the fabric (P) with a surface (100,100 ') in the form of a screw thread and the other part is mounted non-rotatively. - 2 ^the device according to claim 1, characterized in that the surface in screw thread form (110.100 ') of one of the parts having a slope equal to the circular surface (100.110'), the two parts (10,11, 10 ', 11', 10a, 11a), formed in such a way that they fit together, one being filled and the other provided with a central opening for the passage of the fabric. - 3 ^the device according to claims 1 and 2, characterized in that one of the parts (10,11,10 ', 11', 10a, 10b, 11a, 11b) is mounted axially slidably. _ 4th _ Device according to claims 1, 2 and 3, characterized in that the part (10,10 ', 10a, 10b) with the opening is fixedly connected to the needle cylinder (1) for example with the lower one, and the other the full part (11,11 ', 11a, 11b) is located without being able to rotate but can slide inside the other needle cylinder (2). 5 ^â Device according to claims 1 to 4, characterized in that the screw-threaded surface (110) is formed on the full part (11). - 6 ^A device according to claims 1 to 4, characterized in that the surface similar to a screw thread (100) is formed in part (10) with the central opening. The applicant claims the priority of the Czech request submitted on 27 February 1989, under N ⁹ . PV 1209-89 Lisbon, February 16, 1990 n / PpTThv-π, -Γ, τ-Ί-ητ · η- τύ · ----- .. - · - _rr .