DE9311683U1 - Loop manufacturing machine - Google Patents

Description

Description Loop production machine

The innovation concerns a loop production machine with a knotting device for the ends of a loop made from a fed thread and with a trigger lever pivoted on a control shaft, which grips the loop before the loop is knotted and determines the length of the knotted loop by swinging it out more or less far.

Loop production machines of the above type have long been in use in practice for the production of hanging loops and are therefore well known. In the known loop production machines, the drive of the control shaft with the trigger lever is carried out by a cam disk on an upper control shaft. Since the stroke of the trigger lever must be adjustable in order to change the length of the loops to be produced, mechanical adjustment devices are provided for the transmission of the movement between the cam disk and the control shaft with the trigger lever. However, these are of a complicated design and only allow a relatively small adjustment of the stroke of the trigger lever. Furthermore, after adjusting the stroke, maintaining the same basic position of the trigger lever, which is always required, presents difficulties.

The innovation is based on the problem of designing a loop production machine of the type mentioned above in such a way that the trigger can be driven in the simplest possible way and its stroke can be adjusted over the largest possible range.

This problem is solved in accordance with the innovation by providing a piston-cylinder unit with an adjustable stroke for pivoting the trigger lever, which is hinged on the one hand to the housing and on the other hand is connected to the trigger lever in an articulated manner.

With such a loop production machine, the cam disk on the upper control shaft that was previously required to drive the lower control shaft with the trigger lever and the necessary transmission means can be dispensed with. Furthermore, the stroke of the piston-cylinder unit can be easily adjusted so that, starting from a basic position that is always the same, different stroke movements can be made depending on the desired loop length. The piston-cylinder unit can be controlled using conventional control means, so that little effort is required.

When extending, the piston of the piston-cylinder unit can be moved up to a stop that determines the desired loop length if, according to an advantageous development of the innovation, the piston-cylinder unit has a threaded spindle parallel to its cylinder, which is connected at one end by a cross member to the piston rod of the piston-cylinder unit and is guided so that it can move through a hole in a projection provided on the cylinder, and if an adjusting nut is screwed onto the threaded spindle behind the projection.

The innovation allows for various embodiments. One of them is shown in the drawing and is described below. This shows in

Fig.l a side view of a loop production machine after the innovation,

Fig.2 a trigger lever drive which is essential for the innovation.

Figure 1 shows a frame 1 in which an upper control shaft 2 and a lower control shaft 3 are rotatably mounted. The upper control shaft 3 serves to drive a knotting device 4. A needle 5 and a trigger lever 6 are pivotably arranged on the lower control shaft 3 for feeding a thread (not shown) from which a loop is to be knotted. According to the innovation, a piston-cylinder unit 7 is provided for pivoting the trigger lever 6, which is shown enlarged in Figure 2.

The piston-cylinder unit 7 shown in detail in Figure 2 has a cylinder 8, one end of which is articulated to a component connected to the frame 1 shown in Figure 1. A piston rod 9 leads out of the cylinder 8, which has a head 10 with a cross member 11 at its free end. This head 10 is articulated to the trigger lever 6 of the lower control shaft 3. A threaded spindle 12 aligned parallel to the cylinder 8 is attached to the cross member 11, which leads through a hole 13 of a projection 14 of the cylinder 8 and onto which an adjusting nut 15 is screwed behind the projection 14.

When pressure is applied to the piston-cylinder unit 7, the piston rod 9 moves to the right as seen in Figure 2 until the adjusting nut 15 comes against the shoulder 14. This determines the desired pivoting movement of the trigger lever 6.

List of reference symbols

1 frame

2 upper shift shaft

3 lower shift shaft

4 knotting device

5 needle

6 Trigger lever

7 Piston-cylinder unit

8 cylinders

9 Piston rod

10 head

11 Cross beams

12 Threaded spindle

13 Bore

14 Approach

15 Adjusting nut

Claims (2)

Protection Sayings 1. Loop manufacturing machine with a knotting device for the ends of a loop looped from a fed thread and with a trigger lever pivotably mounted on a control shaft, which engages the loop before the loop is knotted and determines the length of the knotted loop by pivoting it out more or less, characterized in that a piston-cylinder unit (7) with an adjustable stroke is provided for pivoting the trigger lever (6), which is hinged on the one hand to the housing and on the other hand is articulated to the trigger lever (6). 2. Loop manufacturing machine according to claim 1, characterized in that the piston-cylinder unit (7) has a threaded spindle (12) parallel to its cylinder (8), which is connected at one end by a cross member (11) to the piston rod (9) of the piston-cylinder unit (7) and through a bore (13) of a (7) provided projection (14) is guided slidably and that an adjusting nut (15) is screwed onto the threaded spindle (12) behind the projection (14).